CN214616751U - Pre-combustion chamber device for gas scavenging and cooling of air inlet pipe and engine - Google Patents
Pre-combustion chamber device for gas scavenging and cooling of air inlet pipe and engine Download PDFInfo
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- CN214616751U CN214616751U CN202120892538.3U CN202120892538U CN214616751U CN 214616751 U CN214616751 U CN 214616751U CN 202120892538 U CN202120892538 U CN 202120892538U CN 214616751 U CN214616751 U CN 214616751U
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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
Abstract
The utility model relates to a prechamber device and engine of gaseous scavenging of intake pipe and cooling, which comprises a cylinder cover, the (air) intake valve pipe, an intake pipe, prechamber body and gas connecting pipe, the inside of prechamber body forms the prechamber inner chamber, be provided with the intake duct on the cylinder cap, cylinder cap bleed air passageway and cylinder cap gas passage, the outer end and the intake pipe intercommunication of intake duct, gas connecting pipe connects between intake pipe and cylinder cap bleed air passage's entry, be equipped with the prechamber scavenge air passage of the export of intercommunication cylinder cap gas passage and prechamber inner chamber on the prechamber body, still be equipped with the middle part intercommunication of upper end and prechamber scavenge air passage on the prechamber body, the prechamber cooling channel of the main combustion chamber intercommunication of lower extreme and engine. The utility model discloses a precombustion chamber device of gaseous scavenging of intake pipe and cooling both can reduce the residual waste gas in the precombustion chamber inner chamber to reduce the residual waste gas coefficient of precombustion chamber inner chamber, also can reduce the heat load of precombustion chamber body.
Description
Technical Field
The utility model belongs to the technical field of automobile engine, especially, relate to a prechamber device and engine of gaseous scavenging of intake pipe and cooling.
Background
With the stricter regulations on fuel consumption, the ultrahigh thermal efficiency of the internal combustion engine becomes a pursued target. The combustion speed is accelerated, the isochoricity is improved, the heat dissipation loss is reduced, and meanwhile, the knocking is inhibited, so that the method is an effective means for improving the heat-work conversion efficiency of the gasoline engine. The jet ignition technology of the precombustion chamber can improve the combustion speed, inhibit the detonation and expand the lean-burn limit, and has certain potential in the aspect of improving the thermal efficiency of the gasoline engine. The jet ignition of the precombustion chamber firstly ignites the mixed gas in the cavity of the precombustion chamber, and the high-temperature and high-pressure mixed gas is sprayed to the main combustion chamber through the small holes to form high-speed jet flame, so that the ignition area is greatly increased, and the combustion speed is improved. And unburned intermediates in the precombustion chamber can also accelerate the combustion process.
During the exhaust stroke of the engine, the exhaust gas after combustion in the main combustion chamber is exhausted through the exhaust passage, but only part of the exhaust gas after combustion in the pre-combustion chamber is exhausted under the influence of the structure of the pre-combustion chamber. In the intake stroke of the engine, fresh air or mixed gas enters the main combustion chamber through the air inlet passage, and meanwhile, part of waste gas remained in the pre-combustion chamber enters the main combustion chamber. During the compression stroke of the engine, part of the fresh mixture in the main combustion chamber will be forced into the pre-combustion chamber. Near compression top dead center, the residual gas fraction in the prechamber is mainly influenced by the amount of gas remaining in the prechamber after the intake stroke and the amount of fresh air mixture entering the prechamber during the compression stroke.
On one hand, because the diameter of the jet hole of the precombustion chamber between the precombustion chamber and the main combustion chamber is small, residual waste gas after ignition of the precombustion chamber can not be completely discharged to the main combustion chamber in an exhaust stroke and an intake stroke of next combustion, and the coefficient of residual waste gas in the precombustion chamber is large. At partial engine load, the larger residual exhaust gas coefficient causes unstable ignition and combustion in the precombustion chamber, even misfires, so that the combustion stability of the main combustion chamber is poor.
On the other hand, the bottom of the precombustion chamber body is provided with precombustion chamber jet holes, the inner wall surface of the bottom of the precombustion chamber body is directly contacted with combustion gas in the inner cavity of the precombustion chamber, the outer wall surface of the bottom of the precombustion chamber body is directly contacted with the combustion gas in the main combustion chamber, and the high-temperature combustion gas at two positions transmits heat to the bottom of the precombustion chamber body so that the temperature of the precombustion chamber body is greatly increased. The middle part and the upper part of the precombustion chamber body are contacted with the cylinder cover, and heat can be transferred to the cylinder cover in a heat conduction mode. When the precombustion chamber body is not provided with a special cooling structure near the precombustion chamber jet hole, the heat at the bottom of the precombustion chamber body can be transferred to the middle part and the upper part of the precombustion chamber body which are contacted with the cylinder cover only in a heat conduction mode. Due to the limitation of thermal conductivity, the bottom of the precombustion chamber body is subjected to high thermal load, and cracking and ablation are easily caused.
SUMMERY OF THE UTILITY MODEL
The utility model discloses the technical problem that will solve is: aiming at the problems that in the prior art, the combustion stability of a main combustion chamber is poor and the heat load of a precombustion chamber body near a jet hole of the precombustion chamber is too high due to the fact that the coefficient of residual waste gas in the precombustion chamber is large, the precombustion chamber device for scavenging and cooling gas in an air inlet pipe and the engine are provided.
In order to solve the technical problem, an embodiment of the utility model provides a prechamber device of intake pipe gas scavenging and cooling, including cylinder cap, (air) intake valve pipe, intake pipe, prechamber body and gas connecting pipe, be provided with on the cylinder cap and be used for installing the prechamber mounting hole of prechamber body, the inside of prechamber body forms the prechamber inner chamber, the bottom of prechamber body is equipped with the prechamber jet orifice that communicates the prechamber inner chamber with the main combustion chamber of engine;
the cylinder cover is provided with an air inlet channel and an air inlet valve guide pipe mounting hole, the outer end of the air inlet channel is communicated with the air inlet pipe, the inner end of the air inlet channel is communicated with a main combustion chamber of an engine, the air inlet valve guide pipe is mounted in the air inlet valve guide pipe mounting hole, and the air inlet valve is inserted in the air inlet valve guide pipe in a sliding manner; a connecting channel is arranged between the inlet valve guide pipe and the rod body of the inlet valve, a cylinder cover air entraining channel and a cylinder cover gas channel are also arranged on the cylinder cover, and the gas connecting pipe is connected between the air inlet pipe and an inlet of the cylinder cover air entraining channel; a pre-combustion chamber scavenging passage which is communicated with an outlet of the cylinder cover gas passage and an inner cavity of the pre-combustion chamber is arranged on the pre-combustion chamber body; the pre-combustion chamber body is also provided with a pre-combustion chamber cooling channel extending from the middle part to the bottom part of the pre-combustion chamber body, the upper end of the pre-combustion chamber cooling channel is communicated with the middle part of a pre-combustion chamber scavenging channel, and the lower end of the pre-combustion chamber cooling channel is communicated with a main combustion chamber of an engine;
and the connecting channel is communicated with an outlet of the cylinder cover air entraining channel and an inlet of the cylinder cover gas channel when the intake valve is opened.
Optionally, encircle on the cylinder head the precombustion chamber body is provided with precombustion chamber mounting hole annular, precombustion chamber mounting hole annular with cylinder head gas passage's export intercommunication, the precombustion chamber scavenging passage encircles the precombustion chamber body is provided with a plurality ofly, the precombustion chamber cooling channel encircles the precombustion chamber body is provided with a plurality ofly, and is a plurality of the entry of precombustion chamber scavenging passage with precombustion chamber mounting hole annular intercommunication, and is a plurality of the export of precombustion chamber scavenging passage with precombustion chamber inner chamber intercommunication, and is a plurality of the upper end of precombustion chamber cooling channel is with a plurality of the middle part one-to-one ground intercommunication of precombustion chamber scavenging passage, and is a plurality of the lower extreme of precombustion chamber cooling channel all communicates with the main combustion chamber of engine.
Optionally, the prechamber injection holes are arranged in a plurality around the bottom of the prechamber body, each prechamber injection hole being located between two adjacent prechamber cooling channels in the circumferential direction.
Optionally, the prechamber device of gaseous scavenging of intake pipe and cooling still is including setting up throttle valve in the intake pipe, be provided with in the intake pipe with the reposition of redundant personnel mouth of gas connecting pipe intercommunication, the throttle valve is located on the gas flow direction the reposition of redundant personnel mouth with between the outer end of intake duct.
Optionally, the prechamber device for scavenging and cooling air in the air inlet pipe further comprises an exhaust valve and an exhaust valve guide pipe, an exhaust passage and an exhaust valve guide pipe mounting hole are further formed in the cylinder cover, the inner end of the exhaust passage is communicated with a main combustion chamber of the engine, the exhaust valve guide pipe is mounted in the exhaust valve guide pipe mounting hole, and the exhaust valve is inserted in the exhaust valve guide pipe in a sliding manner.
Optionally, the prechamber mounting hole is located between the intake valve and the exhaust valve and directly above a main combustion chamber of the engine; the upper end of the precombustion chamber body is provided with a precombustion chamber oil sprayer and a precombustion chamber spark plug;
the precombustion chamber mounting hole is a stepped round hole, the precombustion chamber body is a stepped round pipe, the outer peripheral surface of the stepped round pipe is matched with the shape of the stepped round hole, and the precombustion chamber body is pressed and installed in the precombustion chamber mounting hole.
Optionally, the connection passage is blocked from an outlet of the cylinder head bleed air passage and an inlet of the cylinder head gas passage when the intake valve is closed.
Optionally, an air inlet ring groove and an air guide ring groove are arranged on the air inlet valve guide pipe, the air guide ring groove is located below the air inlet ring groove, the air inlet ring groove is communicated with an outlet of the cylinder cover air guide channel, the air guide ring groove is communicated with an inlet of the cylinder cover air guide channel, an air inlet valve rod ring groove is arranged on the periphery of a rod body of the air inlet valve, and the air inlet ring groove, the air inlet valve rod ring groove and the air guide ring groove form the connecting channel;
when the intake valve is opened, an intake valve rod ring groove on the rod body of the intake valve is communicated with the intake ring groove and the air guide ring groove.
Optionally, the air inlet ring groove and the air guide ring groove are blocked by a rod body of the air inlet valve when the air inlet valve is closed.
According to the utility model discloses gaseous scavenging of intake pipe and antechamber device of cooling, at the intake stroke of engine, the (air) intake valve is opened, switches on between intake ring groove and the air guide ring groove, and highly compressed fresh gas before the air throttle in the intake pipe gets into the antechamber mounting hole annular through gas connecting pipe, cylinder cap bleed air passage, intake ring groove, intake valve pole annular, air guide ring groove, cylinder cap gas passage. And one part of fresh gas entering the ring groove of the mounting hole of the precombustion chamber enters the inner cavity of the precombustion chamber through the scavenging passage of the precombustion chamber, extrudes residual waste gas in the inner cavity of the precombustion chamber to enter the main combustion chamber, and the other part of fresh gas is shunted to enter the cooling passage of the precombustion chamber communicated with the scavenging passage of the precombustion chamber after reaching the middle part of the scavenging passage of the precombustion chamber, flows through the outer wall surface of the precombustion chamber body below the scavenging passage of the precombustion chamber along the cooling passage of the precombustion chamber, and finally enters the main combustion chamber from an outlet of the cooling passage of the precombustion chamber near the jet hole of the precombustion chamber. During other strokes of the engine, the air inlet valve is closed, and the air inlet ring groove and the air guide ring groove are disconnected, so that the high-temperature and high-pressure mixed gas in the main combustion chamber is prevented from reversely flowing back to the air inlet pipe through the channel.
Therefore, the prechamber device for scavenging gas in the air inlet pipe and cooling provided by the embodiment of the invention can reduce or even remove residual waste gas in the inner cavity of the prechamber, so as to reduce the coefficient of the residual waste gas in the inner cavity of the prechamber, improve the ignition stability of the prechamber and further improve the combustion stability of the main combustion chamber; the heat exchange between the fresh gas and the outer wall surface of the precombustion chamber body below the scavenging passage of the precombustion chamber can be utilized to reduce the heat load of the precombustion chamber body near the jet hole of the precombustion chamber and prevent cracking and ablation caused by overhigh heat load. And, the utility model discloses the gaseous antechamber device of scavenging and cooling of intake pipe is used for realizing the simple structure of scavenging and cooling, and whole low in manufacturing cost.
On the other hand, the embodiment of the utility model provides an engine is still provided, including the precombustion chamber device of gaseous scavenging of cylinder body, piston, sprayer and foretell intake pipe and cooling, the cylinder cap is fixed on the cylinder body, be provided with the cylinder on the cylinder body, the piston slides and sets up in the cylinder, the top surface of piston with form the main combustion chamber between the bottom of precombustion chamber body, the sprayer is installed on the cylinder cap, be used for to the intake duct or the oil spout of main combustion chamber.
According to the utility model discloses the engine owing to adopted foretell intake pipe gas scavenging and the antechamber device of cooling, can reduce near the antechamber body of antechamber jet orifice and arouse the risk of fracture and ablation because of heat load is too high, can improve the stability of catching fire of antechamber to the combustion stability who makes main combustion chamber obtains improving.
Drawings
Fig. 1 is a schematic longitudinal sectional view of an engine according to an embodiment of the present invention;
fig. 2 is a schematic longitudinal sectional view of a prechamber arrangement for scavenging and cooling intake gases according to an embodiment of the present invention.
The reference numerals in the specification are as follows:
1. a cylinder body; 2. a piston;
3. a cylinder cover; 30. an air inlet channel; 31. an exhaust passage; 32. a cylinder head gas passage; 33. a pre-combustion chamber mounting hole; 34. a precombustion chamber mounting hole ring groove; 35. a cylinder cover air entraining channel;
4. an intake valve; 40. an inlet valve guide; 41. an air inlet valve rod ring groove; 42. an air inlet ring groove; 43. a gas guide ring groove;
5. an exhaust valve; 50. an exhaust valve conduit;
6. a prechamber body; 60. the inner cavity of the precombustion chamber; 61. a pre-combustion chamber fuel injector; 62. a pre-chamber spark plug; 63. a prechamber jet orifice; 64. a pre-combustion chamber scavenging passage; 65. a prechamber cooling channel;
7. an oil injector; 8. a main combustion chamber; 9. an air inlet pipe; 10. a throttle valve; 11. a gas connecting pipe.
Detailed Description
In order to make the technical problem, technical solution and advantageous effects solved by the present invention more clearly understood, the following description is given in conjunction with the accompanying drawings and embodiments to further explain the present invention in detail. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the invention.
It should be noted that the following directional terms such as upper, lower, inner, outer, top and bottom are only relative concepts or reference to the normal use state of the product, and should not be considered as limiting.
As shown in fig. 1-2, the utility model provides a prechamber device of gaseous scavenging of intake pipe and cooling, including cylinder cap 3, (air) intake valve 4, (air) intake valve pipe 40, intake pipe 9, prechamber body 6 and gas connecting pipe 11, be provided with on the cylinder cap 3 and be used for the installation the prechamber mounting hole 33 of prechamber body 6, the inside formation prechamber inner chamber 60 of prechamber body 6, the bottom of prechamber body 6 is equipped with the intercommunication prechamber inner chamber 60 and the prechamber jet orifice 63 of the main combustion chamber 8 of engine.
Be provided with intake duct 30 and air intake valve pipe mounting hole on the cylinder cap 3, the outer end of intake duct 30 with intake pipe 9 intercommunication, the inner of intake duct 30 communicates with the main combustion chamber 8 of engine, air intake valve pipe 40 installs in the air intake valve pipe mounting hole, intake valve 4 slides and pegs graft in air intake valve pipe 40. A connecting channel is arranged between the inlet valve guide pipe 40 and the rod body of the inlet valve 4. The cylinder cover 3 is further provided with a cylinder cover air-entraining passage 35 and a cylinder cover gas passage 32, and the gas connecting pipe 11 is connected between the air inlet pipe 9 and an inlet of the cylinder cover air-entraining passage 32; the prechamber body 6 is provided with a prechamber scavenging passage 64 which communicates the outlet of the head gas passage 32 with the prechamber inner chamber 60. The pre-combustion chamber body 6 is further provided with a pre-combustion chamber cooling channel 65 extending from the middle part to the bottom part of the pre-combustion chamber body 6, the upper end of the pre-combustion chamber cooling channel 65 is communicated with the middle part of the pre-combustion chamber scavenging channel 64, and the lower end of the pre-combustion chamber cooling channel 65 is communicated with the main combustion chamber 8 of the engine.
Preferably, the inner diameter of the gas connection tube 11 is smaller than the inner diameter of the gas inlet tube 9.
Preferably, the intake valve 4 comprises an intake valve rod and an intake valve disk, the intake valve rod is inserted in the intake valve guide 40 in a sliding manner, and the intake valve disk is connected to one end of the intake valve rod. In the intake stroke of the engine, the intake valve rod slides in the intake valve guide pipe 40 along the direction that the intake valve disc is far away from the inner end of the intake passage 30 until the inner end of the intake passage 30 is completely communicated with the main combustion chamber 8 of the engine, and at this time, the intake valve 4 is in an open state. On other strokes of the engine, the intake valve rod slides in the intake valve guide pipe in the direction that the intake valve disc is close to the inner end of the intake passage 30 until the disc surface of the intake valve disc contacts the inner end of the intake passage 30, and at the moment, the intake valve 4 is in a closed state.
In one embodiment, the connecting channel communicates between the outlet of the head bleed air channel 35 and the inlet of the head gas channel 32 when the inlet valve 4 is open; which is blocked from the outlet of the head bleed air channel 35 and from the inlet of the head gas channel 32 when the inlet valve 4 is closed.
Preferably, be provided with air intake ring groove 42 and air guide ring groove 43 on the intake valve pipe 40, air guide ring groove 43 is located the below of air intake ring groove 42, air intake ring groove 42 with the export intercommunication of cylinder head bleed air passageway 35, air guide ring groove 43 with the entry intercommunication of cylinder head gas passageway 32. Be provided with air inlet valve pole annular 41 on the periphery of the body of rod of (air) intake valve 3, air inlet valve pole annular 42, air inlet valve pole annular 41 and air guide annular 43 constitute connect the passageway. The length of the intake valve rod ring groove 41 is smaller than the stroke of the rod body of the intake valve 4 sliding and stretching in the intake valve guide 40. When the intake valve 4 is opened, the air inlet ring groove 42 and the air guide ring groove 43 are in contact with the air inlet valve rod ring groove 41, and the air inlet ring groove 42, the air inlet valve rod ring groove 41 and the air guide ring groove 43 are communicated in sequence. When intake valve 4 closes, air inlet ring groove 42, lead gas ring groove 43 with on the body of rod of intake valve 4 except that other part contacts outside the air inlet valve pole annular groove 41, air inlet ring groove 42 and lead gas ring groove 43 form closed annular space respectively, air inlet ring groove 42 with lead gas ring groove 43 quilt the body of rod of intake valve 4 blocks.
In an embodiment, a prechamber mounting hole ring groove 34 is provided on the cylinder head 3 around the prechamber body 6, and the prechamber body 6 can be mounted in the prechamber mounting hole 33 such that the prechamber mounting hole ring groove 34 is closed as an annular space. The prechamber mounting hole ring groove 34 communicates with the outlet of the head gas passage 32 so that the head gas passage 32 can deliver the gas in the gas guide ring groove 43 to the prechamber mounting hole ring groove 34. The prechamber scavenging passage 64 is provided in plurality around the prechamber body 6, and a plurality of inlets of the prechamber scavenging passage 64 communicate with the prechamber mounting hole ring groove 34, and a plurality of outlets of the prechamber scavenging passage 64 communicate with the prechamber inner chamber 60. The prechamber mounting hole ring groove 34 is used to collect fresh gas flowing out of the head gas channel 32 and distribute it to the prechamber scavenging channel 64.
The prechamber cooling channel 65 encircles prechamber body 6 and is provided with a plurality ofly to increase cooling effect and heat transfer area, it is a plurality of the upper end of prechamber cooling channel 65 communicates with a plurality of the middle part one-to-one of prechamber scavenge air passageway 64, and is a plurality of the lower extreme of prechamber cooling channel 65 all communicates with the main combustion chamber 8 of engine.
Preferably, the lower ends of a plurality of said prechamber cooling channels 65 are grouped together and connected to the main combustion chamber 8.
In other embodiments, the lower ends of a plurality of said prechamber cooling channels 65 are directly connected to the main combustion chamber 8.
In an embodiment, the intake pipe gas scavenging and temperature reducing prechamber device further comprises a throttle valve 10 arranged in the intake pipe 9, the intake pipe 9 is provided with a branch port communicated with the gas connecting pipe 11, and the throttle valve 10 is located between the branch port and the outer end of the intake passage 30 in the gas flowing direction. The throttle valve 10 is used to regulate the amount of fresh gas entering the intake pipe 9, and the throttle valve 10 is partially opened when the engine is operating at a part load condition. During the intake stroke of the engine, during which the intake valve 4 is opened, the pressure of the fresh gas in the intake pipe 9 before the throttle valve 10 is greater than the pressure of the intake passage 30, the main combustion chamber 8 and the prechamber inner chamber 60, and under the action of this pressure difference, the fresh gas in the intake pipe 9 is pressed out of the flow dividing port into the gas connecting pipe 11 and finally reaches the prechamber inner chamber 60 for scavenging.
In an embodiment, the prechamber injection holes 63 are arranged in a plurality around the bottom of the prechamber body 6, each prechamber injection hole 63 being located between two adjacent prechamber cooling channels 65 in the circumferential direction. Preferably, the prechamber jet holes 63 are circular holes. The prechamber jet hole 63 is used for enabling residual exhaust gas in the prechamber inner cavity 60 to be extruded into the main combustion chamber 8 by fresh gas introduced from the prechamber scavenging passage 64 during the intake stroke of the engine, so as to realize scavenging; the high-temperature and high-pressure mixed gas in the main combustion chamber 8 is re-injected into the prechamber inner chamber 60 in the compression stroke, and the mixed gas ignited by the prechamber ignition plug 62 in the prechamber inner chamber 60 is injected into the main combustion chamber 8 when the piston 2 reaches the top dead center at the end of the compression stroke. The prechamber body 6, the prechamber inner cavity 60, the prechamber fuel injector 61, the prechamber spark plug 62, the prechamber jet holes 63, the prechamber scavenging passage 64 and the prechamber cooling passage 65 together form a prechamber.
In an embodiment, the prechamber device for scavenging air and cooling intake air further comprises an exhaust valve 5 and an exhaust valve guide pipe 50, the cylinder head 3 is further provided with an exhaust passage 31 and an exhaust valve guide pipe mounting hole, the inner end of the exhaust passage 31 is communicated with a main combustion chamber 8 of an engine, the exhaust valve guide pipe 50 is mounted in the exhaust valve guide pipe mounting hole, and the exhaust valve 5 is inserted in the exhaust valve guide pipe 50 in a sliding manner.
Preferably, the exhaust valve 5 comprises an exhaust valve rod and an exhaust valve disc, the exhaust valve rod is slidably inserted into the exhaust valve guide tube 50, and the exhaust valve disc is connected to one end of the exhaust valve rod. During the exhaust stroke of the engine, the exhaust valve rod slides in the exhaust valve guide 50 in a direction to make the exhaust valve disc away from the inner end of the exhaust passage 31 until the inner end of the exhaust passage 31 is completely communicated with the main combustion chamber 8 of the engine, and at this time, the exhaust valve 5 is in an open state. During the other strokes of the engine, the exhaust valve rod slides in the exhaust valve guide 50 in a direction to make the exhaust valve disc approach the inner end of the exhaust passage 31 until the disc surface of the exhaust valve disc contacts the inner end of the exhaust passage 31, at which time the exhaust valve 5 is in a closed state.
In one embodiment, the prechamber mounting hole 33 is located between the inlet valve 4 and the exhaust valve 5 and directly above the main combustion chamber 8 of the engine. A pre-chamber injector 61 and a pre-chamber ignition plug 62 are provided at the upper end of the pre-chamber body 6. Prechamber injector 61 is configured to inject a small amount of fuel into prechamber interior 60 during a compression stroke of the engine to form a combustible mixture within prechamber interior 60. The prechamber ignition plug 62 is used for igniting and igniting the air-fuel mixture in the prechamber inner chamber 60 at the end of the compression stroke when the piston 2 is about to reach the top dead center, so that the pressure in the prechamber inner chamber 60 rises, and therefore the high-temperature mixed gas in the prechamber inner chamber 60 can only be injected into the main combustion chamber 8 through the prechamber injection holes 63 to ignite the mixed compressed gas in the main combustion chamber 8.
The precombustion chamber mounting hole 33 is a stepped round hole, the precombustion chamber body 6 is a stepped round pipe, the outer peripheral surface of the stepped round pipe is matched with the shape of the stepped round hole, and the precombustion chamber body 6 is pressed in the precombustion chamber mounting hole 33.
An embodiment of the utility model provides a prechamber device of gaseous scavenging of intake pipe and cooling, at the intake stroke of engine, the (air) intake valve is opened, switches on between intake ring groove and the air guide ring groove, and highly compressed fresh gas before the air throttle in the intake pipe gets into the prechamber mounting hole annular through gas connecting pipe, cylinder cap bleed passage, intake ring groove, intake valve pole annular, air guide ring groove, cylinder cap gas passage. And one part of fresh gas entering the ring groove of the mounting hole of the precombustion chamber enters the inner cavity of the precombustion chamber through the scavenging passage of the precombustion chamber, extrudes residual waste gas in the inner cavity of the precombustion chamber to enter the main combustion chamber, and the other part of fresh gas is shunted to enter the cooling passage of the precombustion chamber communicated with the scavenging passage of the precombustion chamber after reaching the middle part of the scavenging passage of the precombustion chamber, flows through the outer wall surface of the precombustion chamber body below the scavenging passage of the precombustion chamber along the cooling passage of the precombustion chamber, and finally enters the main combustion chamber from an outlet of the cooling passage of the precombustion chamber near the jet hole of the precombustion chamber. During other strokes of the engine, the air inlet valve is closed, and the air inlet ring groove and the air guide ring groove are disconnected, so that the high-temperature and high-pressure mixed gas in the main combustion chamber is prevented from reversely flowing back to the air inlet pipe through the channel.
Therefore, the prechamber device for scavenging gas in the intake pipe and cooling provided by an embodiment of the utility model can reduce or even remove residual waste gas in the prechamber inner cavity, so as to reduce the residual waste gas coefficient of the prechamber inner cavity, improve the ignition stability of the prechamber, and further improve the combustion stability of the main combustion chamber; the heat exchange between the fresh gas and the outer wall surface of the precombustion chamber body below the scavenging passage of the precombustion chamber can be utilized to reduce the heat load of the precombustion chamber body near the jet hole of the precombustion chamber and prevent cracking and ablation caused by overhigh heat load. Furthermore, an embodiment of the utility model provides a gaseous scavenging of intake pipe and antechamber device of cooling are used for realizing the simple structure of scavenging and cooling, and whole low in manufacturing cost.
On the other hand, the utility model provides an embodiment still provides an engine, including the gaseous precombustion chamber device of scavenging of cylinder body 1, piston 2, sprayer 7 and foretell intake pipe, cylinder cap 3 is fixed on the cylinder body 1, be provided with the cylinder on the cylinder body 1, piston 2 slides and sets up in the cylinder, piston 2's top surface with form main combustion chamber 8 between the bottom of precombustion chamber body 6, sprayer 7 is installed on the cylinder cap 3, be used for to intake duct 30 or the oil spout of main combustion chamber 8. Preferably, the injector 7 is used to inject fuel into the intake passage 30.
The embodiment of the utility model provides an engine, owing to adopted foretell intake pipe gas scavenging and the antechamber device of cooling, can reduce near the antechamber body of antechamber jet orifice and arouse the risk of fracture and ablation because of heat load is too high, can improve the stability of catching fire of antechamber to the combustion stability who makes main combustion chamber obtains improving.
In the intake stroke of the engine, an intake valve is opened, an exhaust valve is closed, a piston moves downwards, and fresh gas in the intake pipe enters a main combustion chamber from an intake passage through the intake valve. At the moment, the intake valve is opened, the air inlet ring groove and the air guide ring groove are communicated, and high-pressure fresh gas in front of the throttle valve in the air inlet pipe enters the pre-combustion chamber mounting hole ring groove through the gas connecting pipe, the cylinder cover air guide channel, the air inlet ring groove, the air inlet valve rod ring groove, the air guide ring groove and the cylinder cover gas channel. And one part of fresh gas entering the ring groove of the mounting hole of the precombustion chamber enters the inner cavity of the precombustion chamber through the scavenging passage of the precombustion chamber, extrudes residual waste gas in the inner cavity of the precombustion chamber to enter the main combustion chamber, and the other part of fresh gas is shunted to enter the cooling passage of the precombustion chamber communicated with the scavenging passage of the precombustion chamber after reaching the middle part of the scavenging passage of the precombustion chamber, flows through the outer wall surface of the precombustion chamber body below the scavenging passage of the precombustion chamber along the cooling passage of the precombustion chamber, and finally enters the main combustion chamber from an outlet of the cooling passage of the precombustion chamber near the jet hole of the precombustion chamber.
In the compression stroke of the engine, the intake valve and the exhaust valve are both closed, and the piston moves upwards to compress the mixed gas in the main combustion chamber. The mixture in the main combustion chamber is pressed into the cavity of the precombustion chamber. At the moment, the air inlet valve is in a closed state, and the air inlet ring groove and the air guide ring groove are disconnected. And a precombustion chamber oil injector arranged on the precombustion chamber body injects a small amount of fuel into the inner cavity of the precombustion chamber so as to form combustible mixed gas in the precombustion chamber.
At the end of the compression stroke, when the piston is about to reach the top dead center, a pre-combustion chamber spark plug arranged on the pre-combustion chamber body ignites and ignites the oil-gas mixture in the inner cavity of the pre-combustion chamber. The pressure in the inner cavity of the precombustion chamber rises, in addition, the air inlet ring groove and the air guide ring groove are disconnected, and the ignited high-temperature mixed gas in the precombustion chamber can be sprayed into the main combustion chamber only through the jet holes of the precombustion chamber and ignites the compressed high-temperature high-pressure mixed gas in the main combustion chamber.
In the power stroke of the engine, the high-temperature and high-pressure mixed gas in the main combustion chamber is ignited by the high-temperature mixed gas sprayed from the jet holes of the precombustion chamber, the high-temperature and high-pressure mixed gas is quickly combusted, the pressure and the temperature are quickly increased, and the piston is pushed to move downwards.
In the exhaust stroke of the engine, the exhaust valve is opened, the piston moves upwards, and burnt exhaust gas enters the exhaust passage from the main combustion chamber through the exhaust valve, and is discharged out of the main combustion chamber.
The above description is only exemplary of the present invention and should not be taken as limiting the scope of the present invention, as any modifications, equivalents, improvements and the like made within the spirit and principles of the present invention are intended to be included within the scope of the present invention.
Claims (10)
1. A precombustion chamber device for scavenging and cooling air in an air inlet pipe is characterized by comprising a cylinder cover, an air inlet valve guide pipe, an air inlet pipe, a precombustion chamber body and a gas connecting pipe, wherein a precombustion chamber mounting hole for mounting the precombustion chamber body is formed in the cylinder cover, a precombustion chamber inner cavity is formed in the precombustion chamber body, and a precombustion chamber jet hole for communicating the precombustion chamber inner cavity with a main combustion chamber of an engine is formed in the bottom of the precombustion chamber body;
the cylinder cover is provided with an air inlet channel and an air inlet valve guide pipe mounting hole, the outer end of the air inlet channel is communicated with the air inlet pipe, the inner end of the air inlet channel is communicated with a main combustion chamber of an engine, the air inlet valve guide pipe is mounted in the air inlet valve guide pipe mounting hole, and the air inlet valve is inserted in the air inlet valve guide pipe in a sliding manner; a connecting channel is arranged between the inlet valve guide pipe and the rod body of the inlet valve, a cylinder cover air entraining channel and a cylinder cover gas channel are also arranged on the cylinder cover, and the gas connecting pipe is connected between the air inlet pipe and an inlet of the cylinder cover air entraining channel; a pre-combustion chamber scavenging passage which is communicated with an outlet of the cylinder cover gas passage and an inner cavity of the pre-combustion chamber is arranged on the pre-combustion chamber body; the pre-combustion chamber body is also provided with a pre-combustion chamber cooling channel extending from the middle part to the bottom part of the pre-combustion chamber body, the upper end of the pre-combustion chamber cooling channel is communicated with the middle part of a pre-combustion chamber scavenging channel, and the lower end of the pre-combustion chamber cooling channel is communicated with a main combustion chamber of an engine;
and the connecting channel is communicated with an outlet of the cylinder cover air entraining channel and an inlet of the cylinder cover gas channel when the intake valve is opened.
2. The intake pipe gas scavenging and temperature reducing pre-chamber device according to claim 1, wherein a pre-chamber mounting hole ring groove is provided on the cylinder head around the pre-chamber body, the pre-chamber mounting hole ring groove communicates with the outlet of the cylinder head gas passage, a plurality of pre-chamber scavenging passages are provided around the pre-chamber body, a plurality of pre-chamber cooling passages are provided around the pre-chamber body, an inlet of the pre-chamber scavenging passage communicates with the pre-chamber mounting hole ring groove, a plurality of outlets of the pre-chamber scavenging passages communicate with the pre-chamber inner cavity, a plurality of upper ends of the pre-chamber cooling passages communicate with a plurality of middle portions of the pre-chamber scavenging passages in a one-to-one correspondence manner, and a plurality of lower ends of the pre-chamber cooling passages communicate with the main combustion chamber of the engine.
3. The intake pipe gas scavenging and temperature reducing prechamber device as claimed in claim 2, characterized in that a plurality of prechamber jet holes are provided around the bottom of the prechamber body, each prechamber jet hole being located between two adjacent prechamber cooling passages in the circumferential direction.
4. The intake pipe gas scavenging and cooling prechamber device as claimed in claim 1, further comprising a throttle valve disposed in the intake pipe, wherein the intake pipe is provided with a branch port communicating with the gas connection pipe, and the throttle valve is located between the branch port and an outer end of the intake duct in a gas flow direction.
5. The intake pipe gas scavenging and cooling prechamber device as claimed in claim 1, wherein the intake pipe gas scavenging and cooling prechamber device further comprises an exhaust valve and an exhaust valve guide, the cylinder head is further provided with an exhaust passage and an exhaust valve guide mounting hole, the inner end of the exhaust passage is communicated with a main combustion chamber of the engine, the exhaust valve guide is mounted in the exhaust valve guide mounting hole, and the exhaust valve is slidably inserted into the exhaust valve guide.
6. The intake pipe gas scavenging and temperature reducing prechamber arrangement as claimed in claim 5, characterized in that the prechamber mounting hole is located between the intake and exhaust valves and directly above the main combustion chamber of the engine; the upper end of the precombustion chamber body is provided with a precombustion chamber oil sprayer and a precombustion chamber spark plug;
the precombustion chamber mounting hole is a stepped round hole, the precombustion chamber body is a stepped round pipe, the outer peripheral surface of the stepped round pipe is matched with the shape of the stepped round hole, and the precombustion chamber body is pressed and installed in the precombustion chamber mounting hole.
7. An inlet tube gas scavenging and temperature reducing prechamber arrangement according to claim 1, characterised in that the connection channel is blocked from the outlet of the cylinder head bleed air channel and from the inlet of the cylinder head gas channel when the inlet tube is closed.
8. The intake pipe gas scavenging and temperature reducing prechamber device as claimed in claim 1, wherein the intake valve guide is provided with an intake ring groove and a gas guiding ring groove, the gas guiding ring groove is located below the intake ring groove, the intake ring groove is communicated with the outlet of the cylinder head gas guiding channel, the gas guiding ring groove is communicated with the inlet of the cylinder head gas guiding channel, the outer circumference of the body of the intake valve is provided with an intake valve rod ring groove, and the intake ring groove, the intake valve rod ring groove and the gas guiding ring groove form the connecting channel;
when the intake valve is opened, an intake valve rod ring groove on the rod body of the intake valve is communicated with the intake ring groove and the air guide ring groove.
9. The intake duct gas scavenging and temperature reducing prechamber arrangement of claim 8, characterized in that the intake ring groove and the gas guiding ring groove are blocked by the rod body of the intake valve when the intake valve is closed.
10. An engine, characterized in that, including cylinder body, piston, sprayer and claim 1-9 any one the intake pipe gaseous scavenging and the antechamber device of cooling, the cylinder cap is fixed on the cylinder body, be provided with the cylinder on the cylinder body, the piston slides and sets up in the cylinder, form main combustion chamber between the top surface of piston and the bottom of antechamber body, the sprayer is installed on the cylinder cap, be used for to intake duct or main combustion chamber oil spout.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202120892538.3U CN214616751U (en) | 2021-04-27 | 2021-04-27 | Pre-combustion chamber device for gas scavenging and cooling of air inlet pipe and engine |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202120892538.3U CN214616751U (en) | 2021-04-27 | 2021-04-27 | Pre-combustion chamber device for gas scavenging and cooling of air inlet pipe and engine |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN214616751U true CN214616751U (en) | 2021-11-05 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202120892538.3U Active CN214616751U (en) | 2021-04-27 | 2021-04-27 | Pre-combustion chamber device for gas scavenging and cooling of air inlet pipe and engine |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN214616751U (en) |
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2021
- 2021-04-27 CN CN202120892538.3U patent/CN214616751U/en active Active
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