阅读说明：本技术 一种预燃室热射流高能点火系统 (Pre-combustion chamber heat jet high-energy ignition system ) 是由 解方喜 王斌 谷乐祺 洪伟 刘宇 王忠恕 李小平 王金港 苏岩 姜北平 金兆辉 于 2021-03-29 设计创作，主要内容包括：一种预燃室热射流高能点火系统属于汽车发动机技术领域,本发明通过对主动式预燃室热射流机构进行改进,将喷油器、火花塞和进气控制机构错落布置,使主动式预燃室热射流机构更加紧凑而且便于安装,实现系统的小型化以便于实现预燃室热射流机构对传统发动机火花塞部件的直接替换；通过预混腔来制备预燃室中的混合气,从而同时实现预燃室内混合气的均匀混合以及混合气量的精确控制；通过液压机构来控制预燃室气门的开启与关闭,实现气门控制机构的小型化以及灵活的预燃室喷油正时。(A kind of precombustion chamber hot jet high-energy ignition system belongs to the car engine technical field, the invention improves the hot jet mechanism of active precombustion chamber, arrange fuel injector, spark plug and admission control mechanism in a staggered way, make the hot jet mechanism of active precombustion chamber compacter and easy to install, realize the miniaturization of the system in order to realize the precombustion chamber hot jet mechanism to the direct replacement of the traditional engine spark plug part; the mixed gas in the precombustion chamber is prepared through the premixing cavity, so that the uniform mixing of the mixed gas in the precombustion chamber and the accurate control of the mixed gas quantity are realized simultaneously; the opening and closing of the valve of the precombustion chamber are controlled by the hydraulic mechanism, so that the miniaturization of the valve control mechanism and the flexible oil injection timing of the precombustion chamber are realized.)

1. A kind of precombustion chamber heat jet high-energy ignition system, characterized by: the device is composed of a precombustion chamber heat jet mechanism (A), a combustion chamber (1), an air inlet pipe (2), a throttle valve (3), a precombustion chamber air inlet pipe a (4), an air inlet valve (5), an engine cylinder cover (6), an exhaust valve (7) and an exhaust pipe (8), wherein the precombustion chamber heat jet mechanism (A) is fixedly connected to the central position of the engine cylinder cover (6), and the bottom end of a middle lower body (E) of the precombustion chamber heat jet mechanism (A) is communicated with the combustion chamber (1); the combustion chamber (1) is positioned below an engine cylinder cover (6), the air inlet pipe (2) is fixedly connected to the left end of the engine cylinder cover (6), and the pre-combustion chamber air inlet pipe a (4) is fixedly connected to the air inlet pipe (2) and communicated with the air inlet pipe (2); the throttle valve (3) is arranged in the air inlet pipe (2) and is arranged on the left side of the air inlet pipe a (4) of the precombustion chamber; the intake valve (5) and the exhaust valve (7) are symmetrically arranged on two sides of the center of the engine cylinder cover (6); the exhaust pipe (8) is fixedly connected to the right end of the engine cylinder cover (6).

2. The precombustor thermal jet high-energy ignition system according to claim 1, wherein: the precombustion chamber hot jet mechanism (A) consists of an upper pressure plate (B), an upper body (C), a lower pressure plate (D), a lower body (E), an oil sprayer (9), an oil sprayer sealing seat (10), a spark plug (11), a precombustion chamber air passage a (12), a hydraulic oil return pipe (13), a hydraulic oil inlet pipe (14), a hydraulic plunger (15), an air valve (16), a spring stop (17) and a return spring (18), wherein the upper pressure plate (B) is cylindrical, three threaded holes of a threaded hole group a (21) are formed in the position close to the circumference of the upper pressure plate, an oil sprayer mounting hole a (20), a precombustion chamber air passage B (19), an oil inlet pipeline (23) and an oil return pipeline (22) are sequentially arranged at the front part of the cylinder from left to right, and a groove a (24) is formed in the; the rear part of the cylinder is provided with a hole b (25); the upper body (C) is cylindrical, three threaded holes of a threaded hole group b (28) are formed in the position, close to the circumference, of the upper body, a threaded hole d (29) is formed in the rear portion of the cylinder, and a hole C (27), a pre-combustion chamber gas circuit C (26) and a hydraulic oil storage chamber (30) are sequentially formed in the front half portion of the cylinder from left to right; the lower end of the hydraulic oil storage chamber (30) is respectively and sequentially provided with a buffer seat (31) and a sealing ring (32); the front side of the lower half part of the cylinder is provided with a premixing cavity (33); the lower pressing plate (D) is cylindrical, three threaded holes of a threaded hole group D (34) are formed in the position, close to the circumference, of the upper surface of the lower pressing plate, a groove b (36) is formed in the top surface of the front part of the disc column, and a valve seat (37) is formed in the bottom of the front part of the cylinder; the rear part of the disc column is provided with a hole e (35); the lower part (E) is a stepped circular table, three threaded holes of a threaded hole group d (38) are arranged on the upper part of the lower part close to the circumference, a groove c (41) and a precombustion chamber (40) are arranged at the center of the stepped circular table, 1-6 jet flow spray holes of a jet flow spray hole group (39) are arranged at the lower end of the center of the stepped circular table, and a thread a (42) is arranged on the outer ring of the lower part of the stepped circular table; the upper pressing plate (B), the upper body (C), the lower pressing plate (D) and the lower body (E) are sequentially arranged from top to bottom, and the fuel injector sealing seat (10) is fixedly connected in a hole a20 of the upper pressing plate (B); the lower part of the fuel injector (9) is fixedly connected with a fuel injector sealing seat (10), and the fuel injection hole end at the lower part of the fuel injector (9) extends into a premixing cavity (33) of the upper body (C) through a hole C (27) of the upper body (C); the spark plug (11) passes through the hole B (25) of the upper pressure plate (B) and is fixedly connected on the threaded hole C (29) of the upper body C, and the head center electrode and the side electrode thereof sequentially pass through the hole D (29) of the lower body (E) and the hole E (35) of the lower pressure plate (D) and extend into the groove C (41) of the lower body (E); the precombustion chamber gas path a (12), the precombustion chamber gas path B (19) of the upper pressure plate (B), the precombustion chamber gas path C (26) of the upper body (C) and the premixing cavity (33) are communicated in sequence; the hydraulic oil inlet pipe (14) is fixedly connected to an oil inlet pipeline (23) of the pressure plate (B), a groove a (24) is formed in the oil inlet pipeline (23), and the groove a is respectively communicated with the oil inlet pipeline (23) and the oil return pipeline (22); an oil inlet pipeline (23) in the upper pressure plate (B) is communicated with a hydraulic oil storage chamber (30) in the upper body (C); the hydraulic oil return pipe (13) is fixedly connected to an oil return pipeline (22) in the upper pressure plate (B); the lower end of the hydraulic oil return pipe (13) is provided with an oil return hole (44), and the outer ring of the lower part of the hydraulic oil return pipe is provided with a thread b (43); the small end of the hydraulic plunger (15) penetrates through a buffer seat (31) and a sealing ring (32) in the upper body (C) and extends into a premixing cavity (33) in the upper body (C); the hydraulic plunger (15) is movably connected with the sealing ring (32); the big end of the hydraulic plunger (15) moves in the hydraulic oil storage chamber (30); the small end of the air valve (16) sequentially passes through an air valve seat (37) and a groove b (36) in the lower pressure plate (D), extends into the premixing cavity (33) of the upper body (C), and is fixedly connected with the small end of the hydraulic plunger (15); the spring stop block (17) is fixedly connected with the small end of the air valve (16); the lower end of the return spring (18) is fixedly connected to the groove b (36) of the lower pressure plate (D), and the upper end of the return spring (18) is fixedly connected to the lower surface of the spring stop block (17).

Technical Field

The invention belongs to the technical field of automobile engines, and particularly relates to a precombustion chamber heat jet high-energy ignition system.

Background

The high-energy ignition of the hot jet in the precombustion chamber is a technical measure for energy conservation and emission reduction of a spark ignition engine with great application potential. Compared with the traditional engine spark plug ignition system, the spark plug of the ignition system firstly initiates the combustion of the mixed gas in the pre-combustion chamber after discharging, and then the combustion flame is sprayed out through the spray holes connected with the main combustion chamber to ignite the combustible mixed gas in the main combustion chamber. The jet flame formed in the precombustion chamber can not only obviously increase the ignition energy obtained by the mixed gas of the main combustion chamber, but also has the functions of multi-point ignition in a cylinder and promotion of air flow movement, and the existing research finds that the jet flame has obvious effects on accelerating the combustion rate, improving the combustion stability, reducing the emission of harmful pollutants and the like.

The precombustion chamber hot jet high-energy ignition device mainly comprises an active type and a passive type at present. The passive precombustion chamber heat jet high-energy ignition system is relatively simple in structure and convenient to realize, but because combustible mixed gas in the precombustion chamber is high-pressure mixed gas which is pressed into the precombustion chamber from an engine cylinder in the compression stroke of an engine, the fuel concentration of the mixed gas in the precombustion chamber is low when the engine adopts a lean burn technology, the formation of heat jet and the ignition performance are deteriorated, and the improvement effect of the engine performance is limited.

Although the independent fuel supply device is arranged in the precombustion chamber of the active precombustion chamber jet ignition device, the flexible adjustment and control of the concentration of the mixed gas in the precombustion chamber can be realized, but the structure size of the realization system is usually relatively large due to the limitation of the sizes of the current oil injector, spark plug and other parts and the coupling arrangement scheme, so that the current highly integrated engine cylinder cover is difficult to directly apply and implement, and the engine needs to be greatly changed; meanwhile, because the volume of the precombustion chamber is small, the mixing time is short, the fuel is easy to collide the wall when the fuel is sprayed, the mixed gas in the precombustion chamber is easy to be locally over-concentrated or over-diluted, the complete combustion of the fuel is further influenced, the emission of carbon smoke and the like is deteriorated, and even the risk that jet holes of the precombustion chamber are damaged exists. In addition, because most of the fresh air required in the current precombustion chamber hot jet high-energy ignition system is pressed from the engine cylinder, the application capability of the system in a combustion mode taking exhaust gas as a main dilution working medium, such as HCCI (homogeneous charge compression ignition), exhaust gas lean burn and the like, is limited.

Disclosure of Invention

The invention aims to solve the defects in the prior art and provides a novel precombustion chamber hot jet high-energy ignition system, which realizes the miniaturization of the system through the staggered arrangement of an oil injector, a spark plug and an air inlet control mechanism.

The invention comprises a precombustion chamber heat jet mechanism A, a combustion chamber 1, an air inlet pipe 2, a throttle valve 3, a precombustion chamber air inlet pipe a4, an air inlet valve 5, an engine cylinder cover 6, an exhaust valve 7 and an exhaust pipe 8, wherein the precombustion chamber heat jet mechanism A is fixedly connected at the central position of the engine cylinder cover 6, and the bottom end of a lower body E in the precombustion chamber heat jet mechanism A is communicated with the combustion chamber 1; the combustion chamber 1 is positioned below an engine cylinder cover 6, the air inlet pipe 2 is fixedly connected to the left end of the engine cylinder cover 6, and the pre-combustion chamber air inlet pipe a4 is fixedly connected to the air inlet pipe 2 and communicated with the air inlet pipe 2; the throttle valve 3 is installed in the intake pipe 2 on the left side of the prechamber intake pipe a 4; the intake valve 5 and the exhaust valve 7 are symmetrically arranged on two sides of the center of the engine cylinder cover 6; the exhaust pipe 8 is fixedly connected to the right end of the engine cylinder cover 6.

The precombustion chamber hot jet mechanism A is composed of an upper pressure plate B, an upper body C, a lower pressure plate D, a lower body E, an oil sprayer 9, an oil sprayer seal seat 10, a spark plug 11, a precombustion chamber air passage a12, a hydraulic oil return pipe 13, a hydraulic oil inlet pipe 14, a hydraulic plunger 15, an air valve 16, a spring stop 17 and a return spring 18, wherein the upper pressure plate B is cylindrical, three threaded holes of a threaded hole group a21 are formed in the position close to the circumference of the upper pressure plate B, an oil sprayer mounting hole a20, a precombustion chamber air passage B19, an oil inlet pipeline 23 and an oil return pipeline 22 are sequentially arranged in the front of the cylinder from left to right, and a groove a24 is; the rear of the cylinder is provided with a hole b 25.

The upper body C is cylindrical, three threaded holes of a threaded hole group b28 are formed in the position, close to the circumference, of the upper body C, a threaded hole d29 is formed in the rear portion of the cylinder, and a hole C27, a pre-combustion chamber air path C26 and a hydraulic oil storage chamber 30 are sequentially formed in the front half portion of the cylinder from left to right; the lower end of the hydraulic oil storage chamber 30 is respectively and sequentially provided with a buffer seat 31 and a sealing ring 32 which are respectively used for reducing the impact of the hydraulic plunger on the upper body C and sealing the hydraulic plunger 15; the front side of the lower half of the cylinder is provided with a premixing cavity 33.

The lower pressing plate D is cylindrical, three threaded holes of a threaded hole group D34 are formed in the position, close to the circumference, of the upper surface of the lower pressing plate D, a groove b36 is formed in the top surface of the front part of the disc column, and a valve seat 37 is arranged at the bottom of the front part of the cylinder; the rear of the disc column is provided with a hole e 35.

The lower body E is a stepped circular truncated cone, three threaded holes of a threaded hole group d38 are arranged on the upper surface of the lower body E near the circumference, a groove c41 and a precombustion chamber 40 are arranged at the center of the stepped circular truncated cone, 1-6 jet spray holes of a jet spray hole group 39 are arranged at the lower end of the center of the stepped circular truncated cone, and a thread a42 is arranged on the outer ring of the lower part of the stepped circular truncated cone.

The upper pressing plate B, the upper body C, the lower pressing plate D and the lower body E are sequentially arranged from top to bottom, and the fuel injector sealing seat 10 is fixedly connected in a hole a20 of the upper pressing plate B; the lower part of the fuel injector 9 is fixedly connected with a fuel injector sealing seat 10 for sealing the fuel injector 9, and the fuel injection hole end at the lower part of the fuel injector 9 extends into the premixing cavity 33 of the upper body C through the hole C27 of the upper body C to provide fuel for the premixing cavity 33; the spark plug 11 passes through the hole B25 of the upper press plate B and is fixed on the screw hole C29 of the upper body C, and the head center electrode and the side electrode sequentially pass through the hole D29 of the lower body E and the hole E35 of the lower press plate D and extend into the groove C41 of the lower body E.

The prechamber air passage a12, the prechamber air passage B19 of the upper pressure plate B, the prechamber air passage C26 of the upper body C and the premixing cavity 33 are communicated in sequence to provide fresh air for the prechamber.

The hydraulic oil inlet pipe 14 is fixedly connected to the oil inlet pipeline 23 of the upper pressure plate B, a groove a24 is formed in the oil inlet pipeline 23, the groove a is respectively communicated with the oil inlet pipeline 23 and the oil return pipeline 22, and the oil inlet pipeline 23 is assisted to quickly release pressure; an oil inlet pipeline 23 in the upper pressure plate B is communicated with a hydraulic oil storage chamber 30 in the upper body C, hydraulic oil enters the hydraulic oil storage chamber 30 through a hydraulic oil inlet pipe 14 and the oil inlet pipeline 23 to build pressure for the hydraulic oil storage chamber 30 and push the hydraulic plunger 15 to move; the hydraulic oil return pipe 13 is fixedly connected to an oil return pipeline 22 in the upper pressure plate B; the lower end of the hydraulic oil return pipe 13 is provided with an oil return hole 44, and the lower outer ring of the hydraulic oil return pipe is provided with a thread b43 for fixing.

The small end of the hydraulic plunger 15 passes through a buffer seat 31 and a sealing ring 32 in the upper body C and extends into a premixing cavity 33 in the upper body C; the hydraulic plunger 15 is movably connected with a sealing ring 32; the big end of the hydraulic plunger 15 moves in the hydraulic oil storage chamber 30; the small end of the air valve 16 sequentially passes through the air valve seat 37 and the groove b36 in the lower pressure plate D, extends into the premixing cavity 33 of the upper body C and is fixedly connected with the small end of the hydraulic plunger 15; the spring stop block 17 is fixedly connected with the small end of the air valve 16; the lower end of the return spring 18 is fixedly connected to the groove b36 of the lower pressure plate D, and the upper end of the return spring 18 is fixedly connected to the lower surface of the spring stop 17.

When the engine runs normally, part of fresh air enters the prechamber air passage a12 through the prechamber air inlet pipe a4, and the other part enters the combustion chamber 1 through the air inlet pipe 2. The fresh air entering the prechamber air passage a12 reaches the premix chamber 33 along the prechamber air passage B19 in the upper platen B and the prechamber air passage C26 in the upper body C, and the fresh air and the fuel sprayed from the injector 9 form a desired, highly concentrated mixture in the premix chamber 33. When the engine needs to be ignited, hydraulic oil enters the hydraulic oil storage chamber 30 in the upper body C through the hydraulic oil inlet pipe 14, the valve 16 overcomes the elastic force of the return spring 18 to move towards the lower body E along with the increase of the pressure of the hydraulic oil in the hydraulic oil storage chamber 30, the valve 16 is opened, the rich mixed gas in the premixing cavity 33 enters the pre-combustion chamber 40 in the lower body E, and at the moment, the spark plug 11 ignites to ignite the rich mixed gas in the pre-combustion chamber 40. The temperature and pressure in the precombustion chamber 40 rapidly rise to form a pressure difference with the combustion chamber 1, and this pressure difference causes the high-temperature burned mixture in the precombustion chamber 40 to be ejected through the jet flow ejection holes 39 in the lower body E and to be ejected as hot jet into the combustion chamber 1, thereby igniting the lean mixture in the combustion chamber 1 of the engine.

After the mixed gas enters the pre-combustion chamber 40, the hydraulic oil flows out through the oil return pipeline 22 and the hydraulic oil return pipe 13 in the upper pressure plate B, the pressure in the hydraulic oil storage chamber 30 is reduced, the return spring 18 returns, and the air valve 16 is closed.

The hydraulic oil return pipe 13 includes an oil return hole 44, which has a different inner diameter from the oil return pipeline 22, and the oil return hole 44 with a smaller inner diameter can generate a throttling effect on the returned hydraulic oil when the valve 16 is closed, thereby effectively playing a role of seating buffer.

The guiding idea of the technical scheme is as follows: through the staggered arrangement of the precombustion chamber mechanism space, the precombustion chamber heat jet mechanism realizes the miniaturization of the mechanism while having the functions of preparing the mixed gas required by the precombustion chamber, realizing the timing of oil injection of the mixed gas and finishing high-energy ignition, and further reduces the change of the structure of the original engine when the precombustion chamber heat jet technology is applied to the engine.

The active pre-combustion chamber heat jet mechanism is improved, and the oil injector, the spark plug and the air inlet control mechanism are arranged in a staggered manner, so that the active pre-combustion chamber heat jet mechanism is more compact and convenient to install, and the miniaturization of the system is realized so as to realize the direct replacement of the pre-combustion chamber heat jet mechanism on the spark plug part of the traditional engine; the mixed gas in the precombustion chamber is prepared through the premixing cavity, so that the uniform mixing of the mixed gas in the precombustion chamber and the accurate control of the mixed gas quantity are realized simultaneously; the opening and closing of the valve of the precombustion chamber are controlled by the hydraulic mechanism, so that the miniaturization of the valve control mechanism and the flexible oil injection timing of the precombustion chamber are realized.

Drawings

FIG. 1 is a schematic structural diagram of a pre-combustion chamber thermal jet high-energy ignition system;

FIG. 2 is an enlarged view of a portion of the prechamber heat jet mechanism A;

FIG. 3 is a top view of the upper platen B;

FIG. 4 is an axial cross-sectional view of the upper platen B;

fig. 5 is a plan view of the upper body C;

FIG. 6 is an axial cross-sectional view of the upper body C;

fig. 7 is a bottom view of the upper body C;

fig. 8 is a top view of the lower platen D;

FIG. 9 is a cross-sectional view of lower platen D;

FIG. 10 is a bottom view of the lower body E;

fig. 11 is a sectional view of the lower body E;

fig. 12 is a sectional view of the hydraulic oil feed line 14;

wherein: A. pre-combustion chamber hot jet mechanism B, upper pressure plate C, upper body D, lower pressure plate E, lower body 1, combustion chamber 2, air inlet pipe 3, throttle valve 4, pre-combustion chamber air inlet pipe a 5, air inlet valve 6, engine cylinder head 7, exhaust valve 8, exhaust pipe 9, fuel injector 10, fuel injector seal seat 11, spark plug 12, pre-combustion chamber air passage a 13, hydraulic oil return pipe 14, hydraulic oil inlet pipe 15, hydraulic plunger 16, air valve 17, spring stop 18, return spring 19, pre-combustion chamber air passage b 20, hole a21, threaded hole a 22, return pipe 23, oil inlet pipe 24, groove a 25, hole b 26, pre-combustion chamber air passage c27, hole c 28, threaded hole b 29, hole d 30, hydraulic oil storage chamber 31, buffer seat 32, seal ring 33, pre-combustion chamber 34, threaded hole d 35, hole e 36, groove b 37, valve seat 38, d 39 and jet flow jet hole b 39 Hole 40, prechamber 41, groove c 42, thread a 43, thread b 44, oil return hole.

Detailed Description

The invention is described below with reference to the drawings.

As shown in figure 1, the invention is composed of a precombustion chamber heat jet mechanism A, a combustion chamber 1, an air inlet pipe 2, a throttle valve 3, a precombustion chamber air inlet pipe a4, an air inlet valve 5, an engine cylinder cover 6, an exhaust valve 7 and an exhaust pipe 8, wherein the precombustion chamber heat jet mechanism A is fixedly connected at the central position of the engine cylinder cover 6, and the bottom end of a lower body E of the precombustion chamber heat jet mechanism A is communicated with the combustion chamber 1; the combustion chamber 1 is positioned below an engine cylinder cover 6, the air inlet pipe 2 is fixedly connected to the left end of the engine cylinder cover 6, and the pre-combustion chamber air inlet pipe a4 is fixedly connected to the air inlet pipe 2 and communicated with the air inlet pipe 2; the throttle valve 3 is installed in the intake pipe 2 on the left side of the prechamber intake pipe a 4; the intake valve 5 and the exhaust valve 7 are symmetrically arranged on two sides of the center of the engine cylinder cover 6; the exhaust pipe 8 is fixedly connected to the right end of the engine cylinder cover 6.

As shown in fig. 2, the precombustion chamber hot jet mechanism a is composed of an upper pressure plate B, an upper body C, a lower pressure plate D, a lower body E, an injector 9, an injector seal seat 10, a spark plug 11, a precombustion chamber air passage a12, a hydraulic oil return pipe 13, a hydraulic oil inlet pipe 14, a hydraulic plunger 15, a valve 16, a spring stopper 17 and a return spring 18.

As shown in fig. 3 and 4, the upper pressure plate B is cylindrical, three threaded holes of a threaded hole group a21 are arranged near the circumference of the upper pressure plate B, a fuel injector mounting hole a20, a pre-combustion chamber air passage B19, an oil inlet pipeline 23 and an oil return pipeline 22 are sequentially arranged at the front part of the cylinder from left to right, and a groove a24 is arranged at the lower end of the oil inlet pipeline 23; the rear of the cylinder is provided with a hole b 25.

As shown in fig. 5 to 7, the upper body C is cylindrical, three threaded holes of the threaded hole group b28 are arranged near the circumference of the upper body C, a threaded hole d29 is arranged at the rear part of the upper body C, and a hole C27, a pre-combustion chamber air passage C26 and a hydraulic oil storage chamber 30 are sequentially arranged in the front half part of the upper body C from left to right; the lower end of the hydraulic oil storage chamber 30 is respectively and sequentially provided with a buffer seat 31 and a sealing ring 32 which are respectively used for reducing the impact of the hydraulic plunger on the upper body C and sealing the hydraulic plunger 15; the front side of the lower half of the cylinder is provided with a premixing cavity 33.

As shown in fig. 8 and 9, the lower pressing plate D is cylindrical, three threaded holes of a threaded hole group D34 are formed in the upper surface of the lower pressing plate D near the circumference, a groove b36 is formed in the top surface of the front part of the disc column, and a valve seat 37 is formed at the bottom of the front part of the cylinder; the rear of the disc column is provided with a hole e 35.

As shown in fig. 10 and 11, the lower body E is a stepped circular truncated cone, three threaded holes of a threaded hole group d38 are arranged on the upper surface of the lower body near the circumference, a groove c41 and a precombustion chamber 40 are arranged at the center of the stepped circular truncated cone, 1-6 jet flow holes of a jet flow hole group 39 are arranged at the lower end of the center of the stepped circular truncated cone, and a thread a42 is arranged on the outer ring of the lower part of the stepped circular truncated cone.

As shown in fig. 2 to 11, the upper pressing plate B, the upper body C, the lower pressing plate D and the lower body E are sequentially arranged from top to bottom, and the injector seal seat 10 is fixedly connected in the hole a20 of the upper pressing plate B; the lower part of the fuel injector 9 is fixedly connected with a fuel injector sealing seat 10 for sealing the fuel injector 9, and the fuel injection hole end at the lower part of the fuel injector 9 extends into the premixing cavity 33 of the upper body C through the hole C27 of the upper body C to provide fuel for the premixing cavity 33; the spark plug 11 passes through the hole B25 of the upper press plate B and is fixed on the screw hole C29 of the upper body C, and the head center electrode and the side electrode sequentially pass through the hole D29 of the lower body E and the hole E35 of the lower press plate D and extend into the groove C41 of the lower body E.

The prechamber air passage a12, the prechamber air passage B19 of the upper pressure plate B, the prechamber air passage C26 of the upper body C and the premixing cavity 33 are communicated in sequence to provide fresh air for the prechamber.

The hydraulic oil inlet pipe 14 is fixedly connected to the oil inlet pipeline 23 of the upper pressure plate B, a groove a24 is formed in the oil inlet pipeline 23, the groove a is respectively communicated with the oil inlet pipeline 23 and the oil return pipeline 22, and the oil inlet pipeline 23 is assisted to quickly release pressure; an oil inlet pipeline 23 in the upper pressure plate B is communicated with a hydraulic oil storage chamber 30 in the upper body C, hydraulic oil enters the hydraulic oil storage chamber 30 through a hydraulic oil inlet pipe 14 and the oil inlet pipeline 23 to build pressure for the hydraulic oil storage chamber 30 and push the hydraulic plunger 15 to move; the hydraulic oil return pipe 13 is fixedly connected to the return pipeline 22 in the upper press plate B.

The small end of the hydraulic plunger 15 passes through a buffer seat 31 and a sealing ring 32 in the upper body C and extends into a premixing cavity 33 in the upper body C; the hydraulic plunger 15 is movably connected with a sealing ring 32; the big end of the hydraulic plunger 15 moves in the hydraulic oil storage chamber 30; the small end of the air valve 16 sequentially passes through the air valve seat 37 and the groove b36 in the lower pressure plate D, extends into the premixing cavity 33 of the upper body C and is fixedly connected with the small end of the hydraulic plunger 15; the spring stop block 17 is fixedly connected with the small end of the air valve 16; the lower end of the return spring 18 is fixedly connected to the groove b36 of the lower pressure plate D, and the upper end of the return spring 18 is fixedly connected to the lower surface of the spring stop 17.

As shown in fig. 12, the lower end of the hydraulic oil return pipe 13 is provided with an oil return hole 44, and the lower outer ring thereof is provided with a thread b43 for fixation.