CN214616748U

CN214616748U - Pre-combustion chamber device for gas scavenging of air inlet pipe and heating of mixed gas and engine

Info

Publication number: CN214616748U
Application number: CN202120890253.6U
Authority: CN
Inventors: 张德道; 李程林; 晏润开; 刘曦光
Original assignee: Dongguan Chenxing Intelligent Precision Equipment Co ltd
Current assignee: Dongguan Chenxing Intelligent Precision Equipment Co ltd
Priority date: 2021-04-27
Filing date: 2021-04-27
Publication date: 2021-11-05
Anticipated expiration: 2031-04-27

Abstract

The utility model relates to a gaseous scavenging of intake pipe and antechamber device and engine of gas mixture heating, which comprises a cylinder cover, the (air) intake valve pipe, an air intake pipe, the antechamber body, gas connection pipe and heater, the inside of antechamber body is the antechamber inner chamber, be equipped 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 connection pipe connects between the entry of intake pipe and cylinder cap bleed air passageway, heater connection is at the middle part of gas connection pipe, be equipped with the antechamber scavenging channel of the export of intercommunication cylinder cap gas passage and antechamber inner chamber on the antechamber body, be equipped with the interface channel of the export of intercommunication cylinder cap bleed air passageway and cylinder cap gas passage's entry when the (air) intake valve is opened between the body of rod of (air) intake valve pipe and (air) intake valve. The utility model discloses a precombustion chamber device of intake pipe gas scavenging and gas mixture heating can reduce the residual waste gas coefficient in the precombustion chamber and rise the temperature of the interior gas mixture of precombustion chamber.

Description

Pre-combustion chamber device for gas scavenging of air inlet pipe and heating of mixed gas and engine

Technical Field

The utility model belongs to the technical field of automobile engine, especially, relate to a prechamber device and engine of intake pipe gas scavenging and gas mixture heating.

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. On the other hand, 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.

Because the diameter of the spray hole between the precombustion chamber and the main combustion chamber is small, residual waste gas after ignition in 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 the 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.

When the automobile engine is in an extremely low temperature environment, the temperature of the wall surface of the precombustion chamber body and the gas inside the precombustion chamber is low, and if the gas in the precombustion chamber is weak in a low-load working condition, the ignition process in the precombustion chamber is very unstable, so that the combustion stability of the engine is poor, and even the engine is difficult to start.

In order to solve the problems of difficult engine starting and unstable combustion of a main combustion chamber under the working condition of low temperature and low load, a certain automobile engine with a precombustion chamber in the prior art is provided with a second spark plug on a cylinder cover besides a first spark plug of the precombustion chamber on a precombustion chamber body, and the second spark plug works under the working conditions of low temperature and low load. Although the problems of difficult engine starting and unstable combustion of the main combustion chamber under the working condition of low temperature and low load can be solved to a certain extent by the pre-combustion chamber engine with the plurality of spark plugs, the plurality of spark plugs are required, the cost of the whole pre-combustion chamber of the engine is increased, the complexity of arrangement and calibration is increased, the problem of high residual exhaust gas coefficient in the pre-combustion chamber cannot be solved effectively, and the problem of poor combustion stability under the low load of the engine can also be solved. In addition, the prechamber engine with a plurality of spark plugs uses the second spark plug on the cylinder cover to ignite under the working condition of low temperature and low load, the working mode of the prechamber engine is not different from that of the traditional engine in essential significance, the initial purpose of the prechamber jet ignition technology is deviated, and the advantage of improving the thermal efficiency of the engine by the prechamber cannot be fully played.

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 due to the fact that the coefficient of residual waste gas in a precombustion chamber is large, and an engine is difficult to start due to the fact that the ignition process in the precombustion chamber is unstable in a low-temperature environment, the precombustion chamber device for scavenging air in an air inlet pipe and heating mixed air 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 gas mixture heating, including cylinder cap, (air) intake valve, intake valve pipe, intake pipe, prechamber body, gas connecting pipe and heater, 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 connecting channel is communicated with an outlet of the cylinder cover air entraining channel and an inlet of the cylinder cover air channel when the inlet valve is opened;

the heater is connected to the middle part of the gas connecting pipe and used for heating the gas flowing through the gas connecting pipe.

Optionally, the heater includes the shell and sets up gaseous heating device in the shell, the shell has entry and export, gaseous connecting pipe includes first gaseous connecting pipe and second gaseous connecting pipe, first gaseous connecting pipe is connected the intake pipe with between the entry of shell, second gaseous connecting pipe is connected the entry of cylinder cap bleed air passageway with between the export of shell.

Optionally, the housing is a tube structure or a box structure.

Optionally, the intake pipe is gaseous to be scavenged and the antechamber device of gas mixture heating still including setting up throttle valve in the intake pipe, be provided with in the intake pipe with the reposition of redundant personnel mouth of first 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 connecting passage is blocked from the outlet of the cylinder head bleed air passage and the 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.

Optionally, encircle on the cylinder head the precombustion chamber body is provided with precombustion chamber mounting hole annular, precombustion chamber mounting hole annular with the export intercommunication of cylinder head gas passage, the precombustion chamber scavenging passage 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, it is a plurality of the export of precombustion chamber scavenging passage with the precombustion chamber inner chamber intercommunication.

Optionally, the prechamber device for scavenging air in the air inlet pipe and heating mixed air 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 mode.

According to the utility model discloses intake pipe gas scavenging and antechamber device of gas mixture heating, at the intake stroke of engine, the (air) intake valve is opened, switches on between air 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 first gas connecting pipe, heater, second gas connecting pipe, cylinder cap bleed air passageway, air intake ring groove, air intake valve pole annular, air guide ring groove, cylinder cap gas passageway. When the engine is in a low-temperature environment, the heater works, and the fresh gas is heated when flowing through the heater, so that the temperature of the fresh gas is increased. Fresh gas enters the inner cavity of the precombustion chamber from the annular groove of the mounting hole of the precombustion chamber through the scavenging channel of the precombustion chamber so as to extrude residual waste gas in the inner cavity of the precombustion chamber into the main combustion chamber, thereby reducing or even eliminating the residual waste gas in the inner cavity of the precombustion chamber and reducing the coefficient of the residual waste gas in the inner cavity of the precombustion chamber; meanwhile, the temperature of the inner cavity of the precombustion chamber during scavenging can be increased by the fresh gas with the increased temperature, and the temperature of mixed gas at the moment of ignition of the inner cavity of the precombustion chamber is increased, so that the ignition stability of the precombustion chamber is improved. Therefore, the utility model discloses intake pipe gas scavenging and antechamber device of gas mixture heating can improve the combustion stability and the low temperature startability of engine under the low temperature state. 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 high-temperature and high-pressure mixed gas in the main combustion chamber is prevented from reversely flowing out to the air inlet pipe through the passage. Furthermore, the utility model discloses intake pipe gas scavenging and the precombustion chamber device of gas mixture heating are used for realizing the simple structure of scavenging and gas mixture heating, lead to holistic 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 gas mixture heating, 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 precombustion chamber body, the sprayer is installed on the cylinder cap, be used for to intake duct or main combustion chamber oil spout.

According to the utility model discloses engine owing to adopted foretell intake pipe gas scavenging and the antechamber device of gas mixture heating, can reduce the residual waste gas coefficient in the antechamber, improves the gas temperature in the antechamber under the low temperature environment simultaneously and then improves the ignition stability of antechamber, makes the engine start easily under the low temperature environment 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 with intake duct gas scavenging and mixture heating according to an embodiment of the 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;

7. an oil injector; 8. a main combustion chamber; 9. an air inlet pipe; 10. a throttle valve; 11. a gas connecting pipe; 12. a heater.

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, an embodiment of the utility model provides a prechamber device of intake pipe gas scavenging and gas mixture heating, including cylinder cap 3, (air) intake valve 4, (air) intake valve pipe 40, intake pipe 9, prechamber body 6, gas connecting pipe 11 and heater 12, be provided with on the cylinder cap 3 and be used for the installation prechamber mounting hole 33 of prechamber body 6, prechamber body 6's inside forms prechamber inner chamber 60, 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 heater 12 is connected to the middle of the gas connecting pipe 11, so that the fresh gas flowing out of the gas inlet pipe 9 to the gas connecting pipe 11 can be heated when flowing through the heater 12, thereby increasing the temperature of the fresh gas when entering the prechamber inner cavity 60 for scavenging, increasing the temperature of the mixed gas in the prechamber inner cavity 60 at the ignition moment, improving the ignition stability of the prechamber at low temperature, and improving the starting performance of the engine. Preferably, the heater 12 is in signal connection with a control unit of the engine, when the engine works, the control unit of the engine judges whether the engine is in a low-temperature cold start process or a low-temperature and low-load working condition, if so, the heater 12 on the gas connecting pipe 11 is made to work to heat the gas flowing through the gas connecting pipe 11; if not, the heater 12 on the gas connecting pipe 11 is stopped to prevent the engine temperature from being too high.

In one embodiment, the heater 12 includes a housing and a gas heating device disposed in the housing, the housing has an inlet and an outlet, the gas connection pipe 11 includes a first gas connection pipe and a second gas connection pipe, the first gas connection pipe is connected between the air inlet pipe 9 and the inlet of the housing, and the second gas connection pipe is connected between the inlet of the head bleed air passage 35 and the outlet of the housing. Preferably, the heating device is a resistance wire heating device or a PTC ceramic heating device or a microwave heating device.

In one embodiment, the housing is a tube structure or a box structure. Preferably, the housing is of a circular tube structure. The opening at the head end of the round pipe is an inlet of the shell and is hermetically connected with the tail end of the first gas connecting pipe, and the opening at the tail end of the round pipe is an outlet of the shell and is hermetically connected with the head end of the second gas connecting pipe.

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.

In an embodiment, the intake pipe gas scavenging and mixture heating prechamber device further comprises a throttle valve 10 arranged in the intake pipe 9, the intake pipe 9 is provided with a branch port communicating 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 provided in a plurality around the bottom of the prechamber body 6. 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.

In an embodiment, the prechamber device for scavenging air in the intake pipe and heating mixed 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 prechamber body 6, the prechamber inner cavity 60, the prechamber fuel injector 61, the prechamber spark plug 62, the prechamber jet hole 63 and the prechamber scavenging passage 64 together form a prechamber.

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 gaseous antechamber device of scavenging and gas mixture heating of intake pipe, 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 first gas connecting pipe, heater, second gas connecting pipe, cylinder cap bleed air passageway, air inlet ring groove, air inlet valve rod annular, air guide ring groove, cylinder cap gas passageway. When the engine is in a low-temperature environment, the heater works, and the fresh gas is heated when flowing through the heater, so that the temperature of the fresh gas is increased. Fresh gas enters the inner cavity of the precombustion chamber from the annular groove of the mounting hole of the precombustion chamber through the scavenging channel of the precombustion chamber so as to extrude residual waste gas in the inner cavity of the precombustion chamber into the main combustion chamber, thereby reducing or even eliminating the residual waste gas in the inner cavity of the precombustion chamber and reducing the coefficient of the residual waste gas in the inner cavity of the precombustion chamber; meanwhile, the temperature of scavenging air in the precombustion chamber can be increased by the fresh gas with higher temperature, and the temperature of mixed gas at the ignition moment of the inner cavity of the precombustion chamber is increased, so that the ignition stability of the precombustion chamber is improved. Therefore, an embodiment of the present invention provides a prechamber device for scavenging intake pipe gas and heating mixture, which can improve the combustion stability and low-temperature starting performance of the engine in a low-temperature state. 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 high-temperature and high-pressure mixed gas in the main combustion chamber is prevented from reversely flowing out to the air inlet pipe through the passage. Furthermore, an embodiment of the present invention provides a pre-chamber device for scavenging air in an intake pipe and heating air mixture, which is used to realize the simple structure of scavenging air and heating air mixture, resulting in low manufacturing cost.

On the other hand, the utility model provides an embodiment still provides an engine, including cylinder body 1, piston 2, sprayer 7 and foretell intake pipe gas scavenging and the precombustion chamber device of gas mixture heating, 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 gas mixture heating, can reduce the residual waste gas coefficient in the antechamber, improve the gas temperature in the antechamber under the low temperature environment simultaneously and then improve the ignition stability of antechamber, make the engine start easily under the low temperature environment to the combustion stability who makes the main combustion chamber obtains improving.

When the engine is started, the control unit of the engine judges whether the engine is in a low-temperature cold start process or a low-temperature and low-load working condition, if so, the heater on the gas connecting pipe works to heat the gas flowing through the gas connecting pipe; if not, the heater on the gas connecting pipe is stopped to prevent the temperature of the engine from being overhigh.

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, switch on between air intake ring groove and the air guide ring groove, high-pressure fresh gas in the air intake pipe in front of the throttle valve passes through the first gas connecting pipe, a heater, the second gas connecting pipe, a cylinder cover air guide channel, the air intake ring groove, the air intake valve rod ring groove, the air guide ring groove, the cylinder cover gas channel enters the precombustion chamber mounting hole ring groove, fresh gas enters the precombustion chamber inner cavity from the precombustion chamber mounting hole ring groove through the precombustion chamber scavenging channel, so as to extrude the residual waste gas in the last combustion process in the precombustion chamber inner cavity into the main combustion chamber, thereby reduce or even clear away the residual waste gas in the precombustion chamber inner cavity, complete scavenging, and thereby realize the purpose of reducing the residual waste gas coefficient in the precombustion chamber. Meanwhile, the temperature of the inner cavity of the precombustion chamber can be increased when the fresh gas heated by the heater enters the inner cavity of the precombustion chamber and is scavenged, and the temperature of mixed gas at the moment of ignition of the inner cavity of the precombustion chamber is increased, so that the ignition stability of the precombustion chamber is improved.

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

1. A pre-combustion chamber device for gas scavenging of an air inlet pipe and heating of mixed gas is characterized by comprising a cylinder cover, an air inlet valve guide pipe, an air inlet pipe, a pre-combustion chamber body, a gas connecting pipe and a heater, wherein a pre-combustion chamber mounting hole for mounting the pre-combustion chamber body is formed in the cylinder cover, a pre-combustion chamber inner cavity is formed in the pre-combustion chamber body, and a pre-combustion chamber jet hole for communicating the pre-combustion chamber inner cavity with a main combustion chamber of an engine is formed in the bottom of the pre-combustion chamber body;

2. The intake air duct gas scavenging and mixture heating prechamber arrangement according to claim 1, characterized in that the heater comprises a housing and a gas heating device arranged in the housing, the housing having an inlet and an outlet, the gas connecting tubes comprising a first gas connecting tube and a second gas connecting tube, the first gas connecting tube being connected between the intake air duct and the inlet of the housing, the second gas connecting tube being connected between the inlet of the head bleed air channel and the outlet of the housing.

3. The intake pipe gas scavenging and mixture heating prechamber arrangement according to claim 2, characterized in that the outer shell is of tubular or box construction.

4. The intake pipe gas scavenging and mixture heating prechamber device as claimed in claim 2, characterized in that the intake pipe gas scavenging and mixture heating prechamber device further comprises a throttle valve arranged in the intake pipe, wherein the intake pipe is provided with a branch port communicating with the first gas connecting pipe, and the throttle valve is located between the branch port and an outer end of the intake passage in a gas flow direction.

5. Intake manifold gas scavenging and mixture heating prechamber arrangement according to claim 1, characterized 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 intake manifold is closed.

6. The intake pipe gas scavenging and mixture heating prechamber device according to claim 1, wherein the intake valve guide pipe is provided with an intake ring groove and a gas guide ring groove, the gas guide ring groove is located below the intake ring groove, the intake ring groove communicates with an outlet of the cylinder head gas guide passage, the gas guide ring groove communicates with an inlet of the cylinder head gas guide passage, an intake valve rod ring groove is provided on an outer periphery of a rod body of the intake valve, and the intake ring groove, the intake valve rod ring groove and the gas guide ring groove constitute the connecting passage;

7. The intake pipe gas scavenging and mixture heating prechamber arrangement according to claim 6, characterized in that the intake ring groove and the pilot ring groove are blocked by the rod body of the intake valve when the intake valve is closed.

8. The intake pipe gas scavenging and mixture heating prechamber device as claimed in claim 1, wherein a prechamber installation hole ring groove is provided on the cylinder head around the prechamber body, the prechamber installation hole ring groove communicates with the outlet of the cylinder head gas passage, the prechamber scavenging passage is provided in plural around the prechamber body, and in plural the inlet of the prechamber scavenging passage communicates with the prechamber installation hole ring groove, and in plural the outlet of the prechamber scavenging passage communicates with the prechamber inner chamber.

9. The intake pipe gas scavenging and mixture heating prechamber device as claimed in claim 1, characterized in that the intake pipe gas scavenging and mixture heating 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 the 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.

10. An engine, characterized in that, including cylinder body, piston, sprayer and claim 1-9 any one the intake pipe is gaseous to be scavenged and the antechamber device of gas mixture heating, 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.