Ammonia fuel high-pressure injection and ignition system

Abstract

The invention relates to an ammonia fuel high-pressure injection and ignition system. The system comprises a cam shaft, an ammonia fuel common rail pipe, a first purge valve, a second purge valve, an ammonia fuel electronic control unit pump and an ammonia injection module of a dual-fuel injector. The oil injection module comprises a diesel oil combined high-pressure oil pump, a diesel oil common rail pipe and a dual-fuel injector; when the cam shaft rotates, the ammonia fuel electronic control unit pump is driven to feed pressurized ammonia fuel into the ammonia fuel common rail pipe, and high-pressure ammonia fuel in the ammonia fuel common rail pipe is injected into a combustion chamber of the internal combustion engine through an ammonia injection module of the dual-fuel injector. After the internal combustion engine is shut down, the first purge valve is used for introducing purge gas into the ammonia fuel common rail pipe, and residual ammonia fuel in the ammonia fuel common rail pipe is discharged from the second purge valve along with the purge gas; and the diesel oil combined high-pressure oil pump feeds the pressurized diesel oil into the diesel oil common rail pipe, and then the diesel oil is injected into a combustion chamber of the internal combustion engine through an oil injection module of the dual-fuel injector so as to ignite ammonia fuel.

Description

Technical Field

[0001] The present invention relates to the field of high-pressure injection of internal combustion engines, and specifically to an ammonia fuel high-pressure injection and ignition system. Background Art

[0002] Ammonia fuel has the advantages of high calorific value, renewable, easy to transport and no carbon emissions. But at the same time, ammonia fuel is volatile, low viscosity, toxic and corrosive. Ammonia fuel volatilizes into gaseous state and easily causes cavitation of parts. The low viscosity of ammonia fuel easily causes failure of moving parts such as plunger pairs and bypass valve components. Ammonia fuel leaks into the air due to poor sealing and easily causes poisoning of personnel. Ammonia fuel contacts with solenoid valves, which easily causes corrosion of parts.

[0003] There is currently no mature application of ammonia fuel high-pressure injection and ignition system. Summary of the invention

[0004] The invention provides an ammonia fuel high-pressure injection and ignition system for realizing the ignition of ammonia fuel by diesel to drive an internal combustion engine.

[0005] The technical solution of the present invention is: An ammonia fuel high-pressure injection and ignition system, comprising: an ammonia fuel high-pressure injection system and a diesel high-pressure ignition system; The ammonia fuel high pressure injection system comprises: a camshaft 12, an ammonia fuel common rail pipe 7, a first purge valve 11, a second purge valve 13, an ammonia fuel electronically controlled unit pump 9 and an ammonia injection module of a dual fuel injector 5; The diesel high-pressure ignition system comprises: a diesel combined high-pressure oil pump 2, a diesel common rail pipe 3 and an injection module of a dual-fuel injector 5; When the camshaft 12 rotates, it drives the ammonia fuel electronically controlled unit pump 9 to deliver the pressurized ammonia fuel into the ammonia fuel common rail pipe 7, and the high-pressure ammonia fuel in the ammonia fuel common rail pipe 7 is injected into the combustion chamber of the internal combustion engine through the ammonia injection module of the dual-fuel injector 5; after the internal combustion engine is stopped, the first purge valve 11 is used to pass the purge gas into the ammonia fuel common rail pipe 7, and the residual ammonia fuel in the ammonia fuel common rail pipe 7 is discharged from the second purge valve 13 together with the purge gas; The diesel combined high-pressure oil pump 2 delivers the pressurized diesel into the diesel common rail pipe 3, and then injects the pressurized diesel into the combustion chamber of the internal combustion engine through the injection module of the dual-fuel injector 5 to ignite the ammonia fuel.

[0006] Preferably, the camshaft 12 is provided with a first cam and a second cam, and the first cam and the second cam are arranged in a 180° direction; Every time the camshaft rotates one circle, the first cam and the second cam work once respectively, and the ammonia fuel electronically controlled unit pump 9 can provide the ammonia fuel common rail pipe 7 with twice pressurized ammonia fuel, so that the number of the ammonia fuel electronically controlled unit pumps 9 is less than the number of cylinders of the internal combustion engine.

[0007] Preferably, the ammonia fuel electronically controlled monomer pump 9 comprises: An ammonia outlet valve assembly 91, a plunger pair 92, an ammonia inlet valve assembly 93, an ammonia outlet connector 94 and a bypass valve 95; The ammonia outlet valve assembly 91, the ammonia inlet valve assembly 93, the ammonia outlet connector 94 and the bypass valve assembly 95 are fixedly assembled on the plunger pair 92; The plunger couple 92 forms a plunger cavity 9201, and the bypass valve assembly 95 is provided with a high-pressure annular groove 9541 and a first low-pressure annular groove 9542; The ammonia inlet channel of the ammonia inlet valve assembly 93, the injection channel of the ammonia outlet valve assembly 91, the plunger cavity 9201 and the high-pressure annular groove 9541 are interconnected through the first channel 9211 provided in the plunger pair 92; The first low-pressure annular groove 9542 and the ammonia outlet channel of the ammonia outlet connector 94 are connected via the second channel 9212 provided in the plunger pair 92; Ammonia fuel first enters the plunger cavity 9201 and the high-pressure annular groove 9541 through the ammonia inlet channel of the ammonia inlet valve assembly 93; When the plunger 922 of the plunger pair 92 starts to move upward, the ammonia inlet valve assembly 93 is closed, and the solenoid valve 951 of the bypass valve assembly 95 is kept de-energized, so that the high-pressure annular groove 9541 and the first low-pressure annular groove 9542 are connected, and the ammonia fuel in the plunger cavity 9201 is discharged outward through the ammonia outlet connector 94; The solenoid valve 951 of the bypass valve assembly 95 is energized after the power-off time reaches the first preset time, so that the high-pressure annular groove 9541 and the first low-pressure annular groove 9542 are no longer connected, and the ammonia fuel pressure in the plunger cavity 9201 gradually increases to the preset injection pressure and is then ejected outward through the ammonia outlet valve assembly 91; After the injection duration reaches the second preset duration, the solenoid valve 951 of the bypass valve assembly 95 is powered off, the high-pressure annular groove 9541 and the first low-pressure annular groove 9542 are restored to connection, and the residual high-pressure ammonia fuel in the plunger cavity 9201 is discharged outward through the ammonia outlet connector 94.

[0008] Preferably, the ammonia fuel electronically controlled monomer pump 9 further comprises: a pump body 96, a plunger spring 97, a lower spring seat 98 and a lead cylinder 99; The plunger sleeve 921 of the plunger pair 92 is fixedly connected to the pump body 96; The lead cylinder 99 is assembled in the inner cavity of the pump body 96; The lower spring seat 98 is installed in the lead cylinder 99; The plunger spring 97 is sleeved on the plunger 922 of the plunger couple 92 , and two ends thereof are respectively connected to the lower spring seat 98 and the plunger sleeve 921 of the plunger couple 92 .

[0009] Preferably, the bypass valve assembly 95 includes: a solenoid valve 951, a solenoid valve spring 952, a bypass valve 953, a bypass valve sleeve 954, a bypass valve body 955 and a baffle 956; The bypass valve body 955 is fixedly connected to the plunger sleeve 921 of the plunger pair 92; The solenoid valve 951 is mounted on one end of the bypass valve body 955, and the baffle 956 is mounted on the other end of the bypass valve body 955; The bypass valve sleeve 954 is assembled inside the bypass valve body 955; The bypass valve 953 is slidably mounted inside the bypass valve sleeve 954; one end of the bypass valve 953 is connected to the solenoid valve 951, and the other end is opposite to the baffle 956; The solenoid valve spring 952 is disposed between the solenoid valve 951 and the bypass valve 953; The inner wall of the bypass valve sleeve 954 is provided with the high-pressure annular groove 9541 and the first low-pressure annular groove 9542; The outer wall of the bypass valve 953 is provided with a connecting annular groove 9531 which can connect the high-pressure annular groove 9541 and the first low-pressure annular groove 9542; The bypass valve body 955 is provided with a first hole 9551 connecting the high-pressure annular groove 9541 and the first channel 9211 and a second hole 9552 connecting the first low-pressure annular groove 9542 and the second channel 9212; When the solenoid valve 951 is powered off, the connecting annular groove 9531 connects the high-pressure annular groove 9541 and the first low-pressure annular groove 9542, so that the plunger cavity 9201, the first channel 9211, the high-pressure annular groove 9541, the connecting annular groove 9531, the first low-pressure annular groove 9542, the second channel 9212 and the ammonia outlet channel of the ammonia outlet connector 94 are connected in sequence; When the solenoid valve 951 is energized, the plunger cavity 9201 is only connected to the injection channel of the ammonia outlet valve assembly 91 .

[0010] Preferably, a first sealing ring groove 9543 is further provided on the inner wall of the bypass valve sleeve 954, and a first sealing oil passage 9553 communicating with the first sealing ring groove 9543 is provided on the bypass valve body 955, and the first sealing oil passage 9553 is used to introduce external sealing oil; A first sealing ring 957 is provided on the high-pressure sealing surface 9554 connecting the bypass valve body 955 and the plunger pair 92; The high-pressure annular groove 9541 and the first low-pressure annular groove 9542 are arranged between the two first sealing annular grooves 9543; The first hole 9551 and the second hole 9552 are arranged between the two first sealing rings 957 .

[0011] Preferably, the bypass valve 953 has an inner hole 9532, and the inner hole 9532 is connected to the end surface facing the baffle 956; The outer wall of the bypass valve 953 is provided with a middle hole 9533 connected to the inner hole 9532; The baffle plate 956 is provided with a groove 9561 on the end surface facing the bypass valve 953; The external sealing oil entering from the first sealing oil passage 9553 passes through the first sealing ring groove 9543, the groove 9561, the inner hole 9532 and the middle hole 9533 to reach the outer periphery of the bypass valve 953, so that the bypass valve 953 remains balanced.

[0012] Preferably, the ammonia inlet valve assembly 93 includes: an ammonia inlet valve body 931, a first valve seat 932, a second valve seat 934, an ammonia inlet valve spring 933 and an ammonia inlet valve 935; The ammonia inlet valve body 931 is provided with a first hydrogen inlet hole 9311 and a first valve seat mounting hole 9312 which are in communication with each other; the first valve seat 932 is assembled in the first valve seat mounting hole 9312; The ammonia inlet valve 935 is assembled on the first valve seat 932 and can form a seal with the first hydrogen inlet hole 9311; One end of the second valve seat 934 extends into the first valve seat mounting hole 9312, and the ammonia inlet valve spring 933 is installed between the first valve seat 932 and the second valve seat 934; The second valve seat 934 is provided with a second hydrogen inlet hole 9342 which connects the first valve seat mounting hole 9312 and the first hydrogen fuel flow channel 9341 inside the second valve seat 934; the first hydrogen fuel flow channel 9341 inside the second valve seat 934 is connected to the first channel 9211; The ammonia inlet valve body 931 is provided with an external thread 9313 fixedly connected to the plunger sleeve 921 of the plunger pair 92 .

[0013] Preferably, the outer ring of the first valve seat 932 is provided with a second sealing ring 936 which forms a seal with the plunger sleeve 921 of the plunger pair 92; The second valve seat 934 has a spherical surface 9343 that forms a spherical seal with the plunger sleeve 921 of the plunger pair 92 .

[0014] Preferably, the ammonia outlet valve assembly 91 comprises: an ammonia outlet valve body 911 , a third valve seat 912 , a fourth valve seat 914 , an ammonia outlet valve 913 and an ammonia outlet valve spring 915 ; The ammonia outlet valve body 911 is provided with a first hydrogen outlet hole 9111 and a second valve seat mounting hole 9112 which are connected to each other; The fourth valve seat 914 is assembled in the second valve seat mounting hole 9112, and the second hydrogen fuel flow channel 9141 inside the fourth valve seat 914 is connected to the first hydrogen outlet hole 9111; One end of the third valve seat 912 extends into the second valve seat mounting hole 9112; The ammonia outlet valve 913 is placed on the third valve seat 912 and can block the hydrogen outlet channel 9121 of the third valve seat 912; The ammonia outlet valve spring 915 is installed between the fourth valve seat 914 and the ammonia outlet valve 913; The fourth valve seat 914 is provided with a second hydrogen outlet hole 9142 which connects the second valve seat mounting hole 9112 with the second hydrogen fuel flow channel 9141 inside the ammonia outlet valve 914; The ammonia outlet valve body 911 is provided with an external thread 9113 fixedly connected to the plunger sleeve 921 of the plunger pair 92 .

[0015] Preferably, the plunger couple 92 comprises: A plunger sleeve 921 and a plunger 922, wherein the plunger 922 is movably inserted into the plunger sleeve 921, and a plunger cavity 9201 is formed between the plunger 922 and the plunger sleeve 921; The plunger sleeve 921 is provided with the first channel 9211 and the second channel 9212; The plunger sleeve 921 is provided with a second low-pressure ring groove 9213 and a second sealing ring groove 9214 surrounding the plunger 922; The plunger sleeve 921 is also provided with a third channel 9215 communicating with the second sealing ring groove 9214, and the third channel 9215 is used for introducing external sealing oil; The second low-pressure ring groove 9213 is in communication with the second channel 9212; A third sealing ring 9216 is installed between the plunger sleeve 921 and the plunger 922; The second low-pressure ring groove 9213 is located below the plunger cavity 9201 , the second sealing ring groove 9214 is located below the second low-pressure ring groove 9213 , and the third sealing ring 9216 is located below the second sealing ring groove 9214 .

[0016] Preferably, the first purge valve 11 comprises: a first valve body 1101, a fifth valve seat 1102, a first pneumatic valve 1103, a first pneumatic valve seat 1104, a first valve cover 1105, a first spring 1106 and a safety valve 1107; The fifth valve seat 1102 is assembled in the first valve body 1101, and a purge gas intake passage 1110 is formed in the first valve body 1101 and the fifth valve seat 1102, and the outlet of the purge gas intake passage 1110 is connected to the ammonia fuel common rail pipe 7; The safety valve 1107 is installed on the first valve body 1101, and the air inlet of the safety valve 1107 is connected with the purge gas inlet channel 1110; One end of the first pneumatic valve seat 1104 extends into the first valve body 1101 and presses the fifth valve seat 1102 tightly; One end of the first pneumatic valve 1103 is movably mounted in a mounting cavity formed between the first pneumatic valve seat 1104 and the first valve cover 1105, and the other end passes through the first pneumatic valve seat 1104 and extends into the fifth valve seat 1102; The first spring 1106 is connected between the first valve cover 1105 and the first pneumatic valve 1103; The first pneumatic valve seat 1104 and the first valve cover 1105 together form a first air intake channel 1108, and the outlet of the first air intake channel 1108 is connected to a first cavity 1109 formed between the first pneumatic valve 1103 and the first pneumatic valve seat 1104; by introducing compressed air into the first air intake channel 1108, after the compressed air enters the first cavity 1109, the first pneumatic valve 1103 is pushed to release the blockage of the purge gas intake channel 1110, and the purge gas enters the ammonia fuel common rail pipe 7 through the purge gas intake channel 1110.

[0017] Preferably, the second purge valve 13 comprises: a second valve body 1301 , a sixth valve seat 1302 , a second pneumatic valve 1303 , a second pneumatic valve seat 1304 , a second valve cover 1305 and a second spring 1306 ; The sixth valve seat 1302 is assembled in the second valve body 1301 , and a purge gas outlet channel 1309 is formed in the second valve body 1301 and the sixth valve seat 1302 . The inlet of the purge gas outlet channel 1309 is connected to the ammonia fuel common rail pipe 7 ; One end of the second pneumatic valve seat 1304 extends into the second valve body 1301 and presses the sixth valve seat 1302 tightly; One end of the second pneumatic valve 1303 is movably mounted in the mounting cavity formed between the second pneumatic valve seat 1304 and the second valve cover 1305, and the other end passes through the second pneumatic valve seat 1304 and extends into the sixth valve seat 1302; The second spring 1306 is connected between the second valve cover 1305 and the second pneumatic valve 1303; The second pneumatic valve seat 1304 and the second valve cover 1305 together form a second air inlet channel 1307, and the outlet of the second air inlet channel 1307 is connected to the second cavity 1308 formed between the second pneumatic valve 1303 and the second pneumatic valve seat 1304; By introducing compressed air into the second air inlet channel 1307, after the compressed air enters the second cavity 1308, the second pneumatic valve 1303 is pushed to release the blockage of the purge gas outlet channel 1309, and the residual ammonia fuel in the ammonia fuel common rail pipe 7 is discharged through the purge gas outlet channel 1309 along with the purge gas.

[0018] The beneficial effects of the present invention are: Diesel is used to ignite ammonia fuel, so that ammonia fuel can be used as fuel for internal combustion engines. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 is a schematic diagram of an ammonia fuel high pressure injection and ignition system in an embodiment of the present application; Figure 2 Schematic diagram of an ammonia fuel electronically controlled single pump in an embodiment of the present application; Figure 3 is a schematic diagram of a bypass valve assembly in an embodiment of the present application; Figure 4 Schematic diagram of an ammonia inlet valve assembly in an embodiment of the present application; Figure 5 is a schematic diagram of an ammonia outlet valve assembly in an embodiment of the present application; Figure 6 Schematic diagram of the plunger pair in the embodiment of the present application; Figure 7 A schematic diagram of a first purge valve in an embodiment of the present application; Figure 8 is a schematic diagram of a second purge valve in an embodiment of the present application; Description of reference numerals: 1-first high-pressure pipe; 2-diesel combined high-pressure oil pump; 3-diesel common rail pipe; 4-second high-pressure pipe; 5-dual fuel injector; 6-third high-pressure pipe; 7-ammonia fuel common rail pipe; 8-fourth high-pressure pipe; 9-ammonia fuel electronically controlled single pump; 10-fifth high-pressure pipe; 11-first purge valve; 12-camshaft; 13-second purge valve; 14-sixth high-pressure pipe; 91- ammonia outlet valve assembly; 92- plunger pair; 93- ammonia inlet valve assembly; 94- ammonia outlet connector; 95- bypass valve assembly; 96- pump body; 97- plunger spring; 98- lower spring seat; 99- guide cylinder; 911- ammonia outlet valve body; 912- third valve seat; 914- fourth valve seat; 913- ammonia outlet valve; 915- ammonia outlet valve spring; 916- fourth sealing ring; 9111- first hydrogen outlet hole; 9112- second valve seat mounting hole; 9113- external thread; 9121- hydrogen outlet channel; 9122- spherical surface; 9141- second hydrogen fuel flow channel; 9142- second hydrogen outlet hole; 921- plunger sleeve; 922- plunger; 9201- plunger cavity; 9211- first channel; 9212- second channel; 9213- second low-pressure ring groove; 9214- second sealing ring groove; 9215- third channel; 9216- third sealing ring; 931- ammonia inlet valve body; 932- first valve seat; 934- second valve seat; 933- ammonia inlet valve spring; 935- ammonia inlet valve; 936- second sealing ring; 9311- first hydrogen inlet hole; 9312- first valve seat mounting hole; 9313- external thread; 9341- first hydrogen fuel flow channel; 9342- second hydrogen inlet hole; 9343- spherical surface; 951-solenoid valve; 952-solenoid valve spring; 953-bypass valve; 954-bypass valve sleeve; 955-bypass valve body; 956-baffle; 957-first sealing ring; 9531-connecting ring groove; 9532-inner hole; 9533-middle hole; 9541-high-pressure ring groove; 9542-first low-pressure ring groove; 9543-first sealing ring groove; 9551-first hole; 9552-second hole; 9553-first sealing oil passage; 9554-high-pressure sealing surface; 9561-groove; 1101-first valve body; 1102-third valve seat; 1103-first pneumatic valve; 1104-first pneumatic valve seat; 1105-first valve cover; 1106-first spring; 1107-safety valve; 1108-first air inlet channel; 1109-first cavity; 1110-purge gas inlet channel; 1301 - second valve body; 1302 - fourth valve seat; 1303 - second pneumatic valve; 1304 - second pneumatic valve seat; 1305 - second valve cover; 1306 - second spring; 1307 - second air inlet channel; 1308 - second cavity; 1309 - purge gas outlet channel. DETAILED DESCRIPTION

[0020] Reference Figure 1 The present application provides an ammonia fuel high pressure injection and ignition system, comprising: Ammonia fuel high pressure injection system and diesel high pressure ignition system; The ammonia fuel high pressure injection system comprises: a camshaft 12, an ammonia fuel common rail pipe 7, a first purge valve 11, a second purge valve 13, an ammonia fuel electronically controlled unit pump 9 and an ammonia injection module of a dual fuel injector 5; The diesel high-pressure ignition system comprises: a diesel combined high-pressure oil pump 2, a diesel common rail pipe 3 and an injection module of a dual-fuel injector 5; When the camshaft 12 rotates, it drives the ammonia fuel electronically controlled unit pump 9 to deliver the pressurized ammonia fuel into the ammonia fuel common rail pipe 7, and the high-pressure ammonia fuel in the ammonia fuel common rail pipe 7 is injected into the combustion chamber of the internal combustion engine through the ammonia injection module of the dual-fuel injector 5; after the internal combustion engine is stopped, the first purge valve 11 is used to pass the purge gas into the ammonia fuel common rail pipe 7, and the residual ammonia fuel in the ammonia fuel common rail pipe 7 is discharged from the second purge valve 13 together with the purge gas; The diesel combined high-pressure oil pump 2 delivers the pressurized diesel into the diesel common rail pipe 3, and then injects the pressurized diesel into the combustion chamber of the internal combustion engine through the injection module of the dual-fuel injector 5 to ignite the ammonia fuel.

[0021] Both the ammonia fuel high-pressure injection system and the diesel ignition system adopt the common rail system, making the entire ammonia fuel high-pressure injection and ignition system flexible and adjustable, and intelligent.

[0022] In the embodiment of the present application, the diesel combined high-pressure oil pump 2 is connected to the diesel common rail pipe 3 through the first high-pressure pipe 1, the injection module of the dual-fuel injector 5 is connected to the diesel common rail pipe 3 through the second high-pressure pipe 4, the ammonia injection module of the dual-fuel injector 5 is connected to the ammonia fuel common rail pipe 7 through the third high-pressure pipe 6, the ammonia fuel electronically controlled single pump 9 is connected to the ammonia fuel common rail pipe 7 through the fourth high-pressure pipe 8, the first purge valve 11 is connected to the ammonia fuel common rail pipe 7 through the fifth high-pressure pipe 10, and the second purge valve 13 is connected to the ammonia fuel common rail pipe 7 through the sixth high-pressure pipe 14.

[0023] The camshaft 12 is arranged below the ammonia fuel electronically controlled unit pump 9, and the first purge valve 11 and the second purge valve 13 are arranged at the left and right ends of the ammonia fuel common rail pipe 7, respectively, and the first purge valve 1, the ammonia fuel common rail pipe 7 and the second purge valve 13 are arranged side by side. In the embodiment of the present application, the dual fuel injector (such as the relevant injector provided in CN117967477A) is an integrated structure of an ammonia fuel injector and a diesel injector, which is compact and easy to install; the diesel high-pressure oil pump adopts a common rail combined high-pressure oil pump (such as the relevant oil pump provided in CN110685841A), and the entire internal combustion engine only needs one common rail combined high-pressure oil pump, which is compact and easy to install.

[0024] The ammonia fuel high-pressure injection pump adopts the form of an electronically controlled single pump, which can prevent the ammonia fuel from vaporizing in the pump. On the other hand, the ammonia fuel electronically controlled single pump can be installed at the injection pump position of the original diesel engine, making it convenient to transform the diesel engine into an ammonia fuel internal combustion engine.

[0025] A first purge valve and a second purge valve are provided on both sides of the ammonia fuel common rail pipe. After the ammonia fuel internal combustion engine is shut down, inert gas or compressed air can be introduced to blow out the residual ammonia fuel in the ammonia fuel common rail pipe and the related oil pipes connected thereto, thereby ensuring the safety of the ammonia fuel high-pressure injection system.

[0026] In the embodiment of the present application, the ammonia fuel electronically controlled monomer pump 9 adopts an electronically controlled monomer pump, and the camshaft is designed as a double cam, which can avoid the vaporization of ammonia fuel, and at the same time increase the number of oil supply times under the same electronically controlled monomer pump volume, effectively increase the ammonia fuel supply, so that the number of ammonia fuel electronically controlled monomer pumps 9 can be reduced. Specifically, the camshaft 12 is provided with a first cam and a second cam, and the first cam and the second cam are arranged in a 180° direction; each time the camshaft 12 rotates one circle, the first cam and the second cam work once, and the ammonia fuel electronically controlled monomer pump 9 can provide the ammonia fuel common rail pipe 7 with two pressurized ammonia fuels, so that the number of ammonia fuel electronically controlled monomer pumps 9 is less than the number of cylinders of the internal combustion engine.

[0027] In the embodiment of the present application, the number of ammonia fuel electronically controlled unit pumps 9 is 2 sets less than the number of diesel engine cylinders. For example, a 6-cylinder ammonia fuel internal combustion engine has 4 ammonia fuel electronically controlled unit pumps, and an 8-cylinder ammonia fuel internal combustion engine has 6 ammonia fuel electronically controlled unit pumps.

[0028] Reference Figures 2 to 6 The embodiment of the present application provides an ammonia fuel electronically controlled single pump, including: an ammonia outlet valve assembly 91, a plunger pair 92, an ammonia outlet joint 94, an ammonia inlet valve assembly 93, a pump body 96, a plunger spring 97, a guide cylinder 99, a lower spring seat 98, and a bypass valve assembly 95.

[0029] The plunger pair 92 is integrated with an ammonia inlet valve assembly 93, a bypass valve assembly 95 and an ammonia outlet valve assembly 91. The plunger pair 92, the bypass valve assembly 95 and other pairs that have relative motion and require high-pressure sealing are designed with sealing ring grooves, and sealing oil can be introduced to seal and lubricate them. The ammonia inlet valve assembly 93, the bypass valve assembly 95 and the ammonia outlet valve assembly 91 are all designed in an integrated manner, which is easy to disassemble and assemble.

[0030] The ammonia inlet valve assembly 93 and the ammonia outlet joint 94 are fixed to the left portion of the plunger couple 92 , the bypass valve assembly 95 is fixed to the right portion of the plunger couple 92 , and the ammonia outlet valve assembly 91 is fixed to the upper portion of the plunger couple 92 .

[0031] A plunger cavity 9201 is formed in the plunger pair 92 , and a high-pressure annular groove 9541 and a first low-pressure annular groove 9542 are provided in the bypass valve assembly 95 .

[0032] Through the first channel 9211 provided in the plunger pair 92, the ammonia inlet channel of the ammonia inlet valve assembly 93, the injection channel of the ammonia outlet valve assembly 91, the plunger cavity 9201 and the high-pressure ring groove 9541 are interconnected.

[0033] The first low-pressure annular groove 9542 and the ammonia outlet channel of the ammonia outlet connector 94 are connected through the second channel 9212 provided in the plunger pair 92 .

[0034] Reference Figure 3 The bypass valve assembly 95 includes a solenoid valve 951, a solenoid valve spring 952, a bypass valve 953, a bypass valve sleeve 954, a bypass valve body 955, and a baffle 956, and the two ends are connected as a whole by screws. The central hole of the bypass valve sleeve 954 is designed with 5 ring grooves, including 1 high-pressure ring groove 9541, 2 first low-pressure ring grooves 9542 and 2 first sealing ring grooves 9543. The high-pressure ring groove 9541 is arranged in the middle of the bypass valve sleeve 954, the two first sealing ring grooves 9543 are arranged on both sides of the bypass valve sleeve, and the two first low-pressure ring grooves 9542 are arranged between the high-pressure ring groove 9541 and the two first sealing ring grooves 9543.

[0035] The bypass valve body 955 is fixedly connected to the plunger sleeve 921 of the plunger pair 92; The solenoid valve 951 is mounted on one end of the bypass valve body 955, and the baffle 956 is mounted on the other end of the bypass valve body 955; The bypass valve sleeve 954 is assembled inside the bypass valve body 955; The bypass valve 953 is slidably mounted inside the bypass valve sleeve 954; one end of the bypass valve 953 is connected to the solenoid valve 951, and the other end is opposite to the baffle 956; The solenoid valve spring 952 is disposed between the solenoid valve 951 and the bypass valve 953; Reference Figure 3 A connecting annular groove 9531 is provided on the outer wall of the bypass valve 953, which can connect the high-pressure annular groove 9541 and the first low-pressure annular groove 9542, and a first hole 9551 that connects the high-pressure annular groove 9541 and the first channel 9211 and a second hole 9552 that connects the first low-pressure annular groove 9542 and the second channel 9212 are provided on the bypass valve body 955.

[0036] Reference Figure 3 The bypass valve body 955 is provided with a first sealing oil passage 9553 connected with the first sealing ring groove 9543, and the first sealing oil passage 9553 is used to pass external sealing oil; a first sealing ring 957 is provided on the high pressure sealing surface 9554 connecting the bypass valve body 955 and the plunger pair 92. The bypass valve 953 has an inner hole 9532, and the inner hole 9532 is connected to the end surface facing the baffle 956; a middle hole 9533 connected to the inner hole 9532 is provided on the outer wall of the bypass valve 953; a groove 9561 is provided on the end surface of the baffle 956 facing the bypass valve 953; the external sealing oil entering from the first sealing oil passage 9553 passes through the first sealing ring groove 9543, the groove 9561, the inner hole 9532 and the middle hole 9533 to reach the outer periphery of the bypass valve 953, so that the bypass valve 953 is kept balanced.

[0037] When the solenoid valve 951 is powered off, the connecting annular groove 9531 connects the high-pressure annular groove 9541 and the first low-pressure annular groove 9542, so that the plunger cavity 9201, the first channel 9211, the high-pressure annular groove 9541, the connecting annular groove 9531, the first low-pressure annular groove 9542, the second channel 9212 and the ammonia outlet channel of the ammonia outlet connector 94 are connected in sequence; When the solenoid valve 951 is energized, the plunger cavity 9201 is only connected to the injection channel of the ammonia outlet valve assembly 91 .

[0038] Reference Figure 6 The plunger pair 92 includes a plunger sleeve 921 and a plunger 922. The central hole of the plunger sleeve 921 is designed with a second low-pressure ring groove 9213 and a second sealing ring groove 9214, and the plunger sleeve 921 is provided with a first channel 9211 and a second channel 9212.

[0039] The second low-pressure annular groove 9213 is designed at the upper part of the middle hole of the plunger sleeve 921 , 5 mm to 20 mm away from the upper end of the plunger 922 , and is connected to the ammonia outlet connector 94 through the second channel 9212 .

[0040] A third sealing ring 9216 is installed between the plunger sleeve 921 and the plunger 922. The second sealing ring groove 9214 is designed to be close to the third sealing ring 9216, and the distance from the third sealing ring 9216 is 3mm-10mm. The second sealing ring groove 9214 is connected to the external sealing oil through the third channel 9215 on the plunger sleeve 921.

[0041] Reference Figure 4 The ammonia inlet valve assembly 93 includes an ammonia inlet valve body 931 , a first valve seat 932 , a second valve seat 934 , an ammonia inlet valve spring 933 and an ammonia inlet valve 935 .

[0042] The ammonia inlet valve body 931 is provided with a first hydrogen inlet hole 9311 and a first valve seat mounting hole 9312 which are in communication with each other; the first valve seat 932 is assembled in the first valve seat mounting hole 9312; The ammonia inlet valve 935 is mounted on the first valve seat 932 and can form a seal with the first hydrogen inlet hole 9311; One end of the second valve seat 934 extends into the first valve seat mounting hole 9312, and the ammonia inlet valve spring 933 is installed between the first valve seat 932 and the second valve seat 934; The second valve seat 934 is provided with a second hydrogen inlet hole 9342 which connects the first valve seat mounting hole 9312 with the first hydrogen fuel flow channel 9341 inside the second valve seat 934; the first hydrogen fuel flow channel 9341 inside the second valve seat 934 is connected with the first channel 9211; The ammonia inlet valve body 931 is provided with an external thread 9313 fixedly connected to the plunger sleeve 921 of the plunger pair 92 .

[0043] The second valve seat 934 and the ammonia inlet valve body 931 are integrated into one by interference fit, and the ammonia inlet valve spring 933, the second valve seat 934 and the ammonia inlet valve 935 are included therein.

[0044] The second valve seat 934 is provided with a spherical surface 9343, and the ammonia inlet valve body 931 is provided with a second sealing ring 936; the two ammonia fuel sealing structures of the spherical surface 9343 and the second sealing ring 936 realize a tight seal with the plunger pair 92 to prevent leakage of the ammonia fuel.

[0045] The ammonia inlet valve body 931 is designed with an external thread 9313 which can be directly connected to the plunger sleeve 921 of the plunger pair 92 .

[0046] Reference Figure 5 The ammonia outlet valve assembly 91 includes: an ammonia outlet valve body 911, a third valve seat 912, a fourth valve seat 914, an ammonia outlet valve 913 and an ammonia outlet valve spring 915; The ammonia outlet valve body 911 is provided with a first hydrogen outlet hole 9111 and a second valve seat mounting hole 9112 which are connected to each other; The fourth valve seat 914 is assembled in the second valve seat mounting hole 9112, and the second hydrogen fuel flow channel 9141 inside the fourth valve seat 914 is connected to the first hydrogen outlet hole 9111; One end of the third valve seat 912 extends into the second valve seat mounting hole 9112; The ammonia outlet valve 913 is placed on the third valve seat 912 and can block the hydrogen outlet channel of the third valve seat 912; The ammonia outlet valve spring 915 is installed between the fourth valve seat 914 and the ammonia outlet valve 913; The ammonia outlet valve 913 is provided with a second hydrogen outlet hole 9142 which connects the second valve seat mounting hole 9112 with the second hydrogen fuel flow channel 9141 inside the ammonia outlet valve 913; The ammonia outlet valve body 911 is provided with an external thread 9113 fixedly connected to the plunger sleeve 921 of the plunger pair 92 .

[0047] The ammonia valve assembly 91 is provided with two ammonia fuel sealing structures, namely, a spherical surface 9122 and a fourth sealing ring 916 , which form a tight seal with the plunger pair 92 .

[0048] The working process of the above-mentioned ammonia fuel electronically controlled monomer pump is as follows: During assembly, first assemble the plunger pair 92 onto the pump body 96, then assemble the ammonia inlet valve assembly 93, bypass valve assembly 95, and ammonia outlet valve assembly 91 onto the plunger pair 92 in sequence, and finally assemble the ammonia outlet joint 94 and the corresponding sealing gasket onto the plunger pair 92. Then assemble the lower plunger spring 97, guide cylinder 99, and lower spring seat 98 in sequence. At this point, the installation of the ammonia fuel electronically controlled single pump is complete.

[0049] During operation, when the ammonia fuel enters through the ammonia inlet valve assembly 93 and fills the plunger cavity 9201 and the high-pressure ring groove 9541, there is no pressure loss of the ammonia fuel in this process and the ammonia fuel will not vaporize.

[0050] As the plunger 922 moves upward, the ammonia inlet valve assembly 93 is closed, the solenoid valve 951 of the bypass valve assembly 95 is kept de-energized, and the ammonia fuel flows from the high-pressure annular groove 9541 to the first low-pressure annular groove 9542, and flows out of the ammonia fuel electronically controlled single pump through the ammonia outlet connector 94.

[0051] The solenoid valve 951 of the bypass valve assembly 95 is energized after the power-off duration reaches a first preset duration. When the solenoid valve 951 is energized, the bypass valve 953 moves upward, the bypass valve assembly 95 is closed, the ammonia fuel stops flowing from the high-pressure annular groove 9541 to the first low-pressure annular groove 9542, and the plunger chamber 9201 begins to increase pressure. When the pressure in the plunger chamber 9201 increases to the preset injection pressure, the ammonia fuel flows out through the ammonia outlet valve assembly 91 to supply high-pressure ammonia fuel, thereby completing the supply of high-pressure ammonia fuel.

[0052] After the injection duration reaches the second preset duration, the solenoid valve 951 is de-energized, the bypass valve 953 moves downward, the bypass valve assembly 95 opens, the ammonia fuel flows from the high-pressure annular groove 9541 to the first low-pressure annular groove 9542, the pressure in the plunger chamber 9201 drops, and flows out of the ammonia fuel electronically controlled unit pump through the ammonia outlet connector 94.

[0053] When the pressure in the plunger chamber 9201 drops, the ammonia outlet valve 913 in the ammonia outlet valve assembly 91 moves downward, preventing the high-pressure ammonia fuel in the high-pressure oil pipe connected to the ammonia fuel electronically controlled unit pump from flowing back into the plunger chamber, thereby maintaining the high pressure of the ammonia fuel in the high-pressure oil pipe connected to the ammonia fuel electronically controlled unit pump, thereby preventing the ammonia fuel from vaporizing.

[0054] During use, the high-pressure ammonia fuel in the plunger cavity 9201 flows into the second low-pressure annular groove 9213 through the gap between the plunger 922 and the plunger sleeve 921. The second low-pressure annular groove 9213 is connected to the ammonia outlet joint 94 through the second channel 9212, thereby reducing the pressure of the ammonia fuel. The second sealing annular groove 9214 in the plunger pair is filled with sealing oil, which enters the gap between the plunger 922 and the plunger sleeve 921, isolating the ammonia fuel and preventing it from leaking out of the gap, while achieving the purpose of lubricating the plunger pair.

[0055] The high-pressure ammonia fuel in the high-pressure annular groove 9541 in the bypass valve assembly 95 flows to the first low-pressure annular grooves 9542 on both sides, and sealing oil is introduced into the first sealing annular grooves 9543 at both ends. The sealing oil can flow into the gap between the bypass valve 953 and the bypass valve sleeve 954, isolating the ammonia fuel and preventing it from leaking out through the gap and corroding the solenoid valve. At the same time, it can achieve the purpose of lubricating the bypass valve assembly.

[0056] The second valve seat 934 and the ammonia inlet valve body 931 are interference-fitted to make the ammonia inlet valve assembly 93 an integral whole, which is convenient for disassembly, assembly and replacement. The ammonia inlet valve assembly 93 includes two sealing structures, namely, a spherical surface 9343 and a second sealing ring 936. When the spherical surface 9343 fails to seal the ammonia fuel abnormally, the second sealing ring 936 can perform a secondary seal on the ammonia fuel.

[0057] The ammonia outlet valve 913 is positioned and guided by the outer circle and the second hydrogen fuel flow channel 9141 of the fourth valve seat 914, and the third valve seat 912 and the ammonia outlet valve body 911 are interference-fitted, so that the ammonia outlet valve assembly 91 becomes a whole, which is convenient for disassembly and replacement of the whole. The ammonia outlet valve assembly 91 is provided with two ammonia fuel sealing structures, the spherical surface 9122 and the fourth sealing ring 916. When the spherical surface 9122 fails to seal the ammonia fuel abnormally, the fourth sealing ring 916 can perform a secondary seal on the ammonia fuel.

[0058] Reference Figure 7 , the first purge valve 11 includes: a first valve body 1101, a fifth valve seat 1102, a first pneumatic valve 1103, a first pneumatic valve seat 1104, a first valve cover 1105, a first spring 1106 and a safety valve 1107; The fifth valve seat 1102 is assembled in the first valve body 1101, and a purge gas intake passage 1110 is formed in the first valve body 1101 and the fifth valve seat 1102, and the outlet of the purge gas intake passage 1110 is connected to the ammonia fuel common rail pipe 7; The safety valve 1107 is installed on the first valve body 1101, and the air inlet of the safety valve 1107 is connected with the purge gas inlet channel 1110; One end of the first pneumatic valve seat 1104 extends into the first valve body 1101 and presses the fifth valve seat 1102 tightly; One end of the first pneumatic valve 1103 is movably mounted in a mounting cavity formed between the first pneumatic valve seat 1104 and the first valve cover 1105, and the other end passes through the first pneumatic valve seat 1104 and extends into the fifth valve seat 1102; The first spring 1106 is connected between the first valve cover 1105 and the first pneumatic valve 1103; The first pneumatic valve seat 1104 and the first valve cover 1105 together form a first air intake channel 1108, and the outlet of the first air intake channel 1108 is connected to a first cavity 1109 formed between the first pneumatic valve 1103 and the first pneumatic valve seat 1104; by introducing compressed air into the first air intake channel 1108, after the compressed air enters the first cavity 1109, the first pneumatic valve 1103 is pushed to release the blockage of the purge gas intake channel 1110, and the purge gas enters the ammonia fuel common rail pipe 7 through the purge gas intake channel 1110.

[0059] Reference Figure 8 The second purge valve 13 includes: a second valve body 1301, a sixth valve seat 1302, a second pneumatic valve 1303, a second pneumatic valve seat 1304, a second valve cover 1305 and a second spring 1306; The sixth valve seat 1302 is assembled in the second valve body 1301 , and a purge gas outlet channel 1309 is formed in the second valve body 1301 and the sixth valve seat 1302 . The inlet of the purge gas outlet channel 1309 is connected to the ammonia fuel common rail pipe 7 ; One end of the second pneumatic valve seat 1304 extends into the second valve body 1301 and presses the sixth valve seat 1302 tightly; One end of the second pneumatic valve 1303 is movably mounted in the mounting cavity formed between the second pneumatic valve seat 1304 and the second valve cover 1305, and the other end passes through the second pneumatic valve seat 1304 and extends into the sixth valve seat 1302; The second spring 1306 is connected between the second valve cover 1305 and the second pneumatic valve 1303; The second pneumatic valve seat 1304 and the second valve cover 1305 together form a second air inlet channel 1307, and the outlet of the second air inlet channel 1307 is connected to the second cavity 1308 formed between the second pneumatic valve 1303 and the second pneumatic valve seat 1304; By introducing compressed air into the second air inlet channel 1307, after the compressed air enters the second cavity 1308, the second pneumatic valve 1303 is pushed to release the blockage of the purge gas outlet channel 1309, and the residual ammonia fuel in the ammonia fuel common rail pipe 7 is discharged through the purge gas outlet channel 1309 along with the purge gas.

[0060] The first purge valve 11 and the second purge valve 13 can be used to remove the residual ammonia fuel in the ammonia fuel common rail pipe 7. The safety valve 1107 configured on the first purge valve 11 can also safely release the ammonia fuel in an emergency when the ammonia fuel pressure in the ammonia fuel common rail pipe 7 is too high.

Claims

1. An ammonia fuel high pressure injection and ignition system, characterized in that: include: Ammonia fuel high pressure injection system and diesel high pressure ignition system; The ammonia fuel high-pressure injection system comprises: a camshaft (12), an ammonia fuel common rail pipe (7), a first purge valve (11), a second purge valve (13), an ammonia fuel electronically controlled unit pump (9) and an ammonia injection module of a dual fuel injector (5); The diesel high-pressure ignition system comprises: a diesel combined high-pressure oil pump (2), a diesel common rail pipe (3) and an injection module of a dual-fuel injector (5); When the camshaft (12) rotates, it drives the ammonia fuel electronically controlled unit pump (9) to deliver pressurized ammonia fuel into the ammonia fuel common rail pipe (7), and the high-pressure ammonia fuel in the ammonia fuel common rail pipe (7) is injected into the combustion chamber of the internal combustion engine via the ammonia injection module of the dual-fuel injector (5); after the internal combustion engine is stopped, the first purge valve (11) is used to pass purge gas into the ammonia fuel common rail pipe (7), and residual ammonia fuel in the ammonia fuel common rail pipe (7) is discharged from the second purge valve (13) together with the purge gas; The diesel combined high-pressure oil pump (2) delivers pressurized diesel into the diesel common rail pipe (3), and then injects the pressurized diesel into the combustion chamber of the internal combustion engine via the injection module of the dual-fuel injector (5) to ignite the ammonia fuel.

2. The ammonia fuel high pressure injection and ignition system according to claim 1, characterized in that: The camshaft (12) is provided with a first cam and a second cam, and the first cam and the second cam are arranged in a 180° direction; Each time the camshaft (12) rotates one circle, the first cam and the second cam work once respectively, and the ammonia fuel electronically controlled unit pump (9) can provide the ammonia fuel common rail (7) with twice pressurized ammonia fuel, so that the number of the ammonia fuel electronically controlled unit pumps (9) is less than the number of cylinders of the internal combustion engine.

3. The ammonia fuel high pressure injection and ignition system according to claim 1, characterized in that: The ammonia fuel electronically controlled monomer pump (9) comprises: An ammonia outlet valve assembly (91), a plunger pair (92), an ammonia inlet valve assembly (93), an ammonia outlet connector (94) and a bypass valve assembly (95); The ammonia outlet valve assembly (91), the ammonia inlet valve assembly (93), the ammonia outlet joint (94) and the bypass valve assembly (95) are fixedly assembled on the plunger pair (92); A plunger cavity (9201) is formed in the plunger pair (92), and a high-pressure annular groove (9541) and a first low-pressure annular groove (9542) are provided in the bypass valve assembly (95); The ammonia inlet channel of the ammonia inlet valve assembly (93), the injection channel of the ammonia outlet valve assembly (91), the plunger cavity (9201) and the high-pressure annular groove (9541) are interconnected through a first channel (9211) provided in the plunger pair (92); The first low-pressure ring groove (9542) and the ammonia outlet channel of the ammonia outlet connector (94) are connected via a second channel (9212) provided in the plunger pair (92); Ammonia fuel first enters the plunger cavity (9201) and the high-pressure ring groove (9541) through the ammonia inlet channel of the ammonia inlet valve assembly (93); When the plunger (922) of the plunger pair (92) starts to move upward, the ammonia inlet valve assembly (93) is closed, and the solenoid valve (951) of the bypass valve assembly (95) is kept de-energized, so that the high-pressure annular groove (9541) and the first low-pressure annular groove (9542) are connected, and the ammonia fuel in the plunger cavity (9201) is discharged to the outside through the ammonia outlet joint (94); The solenoid valve (951) of the bypass valve assembly (95) is energized after the power-off duration reaches a first preset duration, so that the high-pressure annular groove (9541) and the first low-pressure annular groove (9542) are no longer connected, and the ammonia fuel pressure in the plunger cavity (9201) gradually increases to a preset injection pressure and is then ejected outward through the ammonia outlet valve assembly (91); After the injection duration reaches a second preset duration, the solenoid valve (951) of the bypass valve assembly (95) is de-energized, the high-pressure annular groove (9541) and the first low-pressure annular groove (9542) are restored to communication, and the residual high-pressure ammonia fuel in the plunger cavity (9201) is discharged outward through the ammonia outlet connector (94).

4. The ammonia fuel high pressure injection and ignition system according to claim 3, characterized in that: The ammonia fuel electronically controlled single pump (9) further comprises: a pump body (96), a plunger spring (97), a lower spring seat (98) and a lead cylinder (99); The plunger sleeve (921) of the plunger pair (92) is fixedly connected to the pump body (96); The lead cylinder (99) is assembled in the inner cavity of the pump body (96); The lower spring seat (98) is installed in the lead cylinder (99); The plunger spring (97) is sleeved on the plunger (922) of the plunger pair (92), and two ends are respectively connected to the lower spring seat (98) and the plunger sleeve (921) of the plunger pair (92).

5. The ammonia fuel high pressure injection and ignition system according to claim 3, characterized in that: The bypass valve assembly (95) comprises: a solenoid valve (951), a solenoid valve spring (952), a bypass valve (953), a bypass valve sleeve (954), a bypass valve body (955) and a baffle (956); The bypass valve body (955) is fixedly connected to the plunger sleeve (921) of the plunger pair (92); The solenoid valve (951) is mounted on one end of the bypass valve body (955), and the baffle (956) is mounted on the other end of the bypass valve body (955); The bypass valve sleeve (954) is assembled inside the bypass valve body (955); The bypass valve (953) is slidably mounted inside the bypass valve sleeve (954); one end of the bypass valve (953) is connected to the solenoid valve (951), and the other end is opposite to the baffle (956); The solenoid valve spring (952) is arranged between the solenoid valve (951) and the bypass valve (953); The high-pressure annular groove (9541) and the first low-pressure annular groove (9542) are provided on the inner wall of the bypass valve sleeve (954); The outer wall of the bypass valve (953) is provided with a connecting annular groove (9531) that can connect the high-pressure annular groove (9541) and the first low-pressure annular groove (9542); The bypass valve body (955) is provided with a first hole (9551) for connecting the high-pressure annular groove (9541) and the first channel (9211), and a second hole (9552) for connecting the first low-pressure annular groove (9542) and the second channel (9212); When the solenoid valve (951) is powered off, the connecting ring groove (9531) connects the high-pressure ring groove (9541) and the first low-pressure ring groove (9542), so that the plunger cavity (9201), the first channel (9211), the high-pressure ring groove (9541), the connecting ring groove (9531), the first low-pressure ring groove (9542), the second channel (9212) and the ammonia outlet channel of the ammonia outlet connector (94) are connected in sequence; When the solenoid valve (951) is energized, the plunger chamber (9201) is only in communication with the injection channel of the ammonia outlet valve assembly (91).

6. The ammonia fuel high pressure injection and ignition system according to claim 5, characterized in that: A first sealing ring groove (9543) is also provided on the inner wall of the bypass valve sleeve (954), and a first sealing oil passage (9553) in communication with the first sealing ring groove (9543) is provided on the bypass valve body (955), wherein the first sealing oil passage (9553) is used for introducing external sealing oil; A first sealing ring (957) is provided on the high-pressure sealing surface (9554) connecting the bypass valve body (955) and the plunger pair (92); The high-pressure ring groove (9541) and the first low-pressure ring groove (9542) are arranged between the two first sealing ring grooves (9543); The first hole (9551) and the second hole (9552) are arranged between the two first sealing rings (957).

7. The ammonia fuel high pressure injection and ignition system according to claim 6, characterized in that: The bypass valve (953) has an inner hole (9532), and the inner hole (9532) is connected to the end surface facing the baffle (956); The outer wall of the bypass valve (953) is provided with a middle hole (9533) connected to the inner hole (9532); A groove (9561) is provided on the end surface of the baffle (956) facing the bypass valve (953); The external sealing oil entering from the first sealing oil passage (9553) passes through the first sealing ring groove (9543), the groove (9561), the inner hole (9532) and the middle hole (9533) to reach the outer periphery of the bypass valve (953), so that the bypass valve (953) remains balanced.

8. The ammonia fuel high pressure injection and ignition system according to claim 3, characterized in that: The ammonia inlet valve assembly (93) comprises: an ammonia inlet valve body (931), a first valve seat (932), a second valve seat (934), an ammonia inlet valve spring (933) and an ammonia inlet valve (935); The ammonia inlet valve body (931) is provided with a first hydrogen inlet hole (9311) and a first valve seat mounting hole (9312) that are in communication with each other; the first valve seat (932) is assembled in the first valve seat mounting hole (9312); The ammonia inlet valve (935) is assembled on the first valve seat (932) and can form a seal with the first hydrogen inlet hole (9311); One end of the second valve seat (934) extends into the first valve seat mounting hole (9312), and the ammonia inlet valve spring (933) is mounted between the first valve seat (932) and the second valve seat (934); The second valve seat (934) is provided with a second hydrogen inlet hole (9342) for connecting the first valve seat mounting hole (9312) and the first hydrogen fuel flow channel (9341) inside the second valve seat (934); the first hydrogen fuel flow channel (9341) inside the second valve seat (934) is connected to the first channel (9211); The ammonia inlet valve body (931) is provided with an external thread (9313) fixedly connected to the plunger sleeve (921) of the plunger pair (92).

9. The ammonia fuel high pressure injection and ignition system according to claim 8, characterized in that: The outer ring of the first valve seat (932) is provided with a second sealing ring (936) which forms a seal with the plunger sleeve (921) of the plunger pair (92); The second valve seat (934) has a spherical surface (9343) that forms a spherical seal with the plunger sleeve (921) of the plunger pair (92).

10. The ammonia fuel high pressure injection and ignition system according to claim 3, characterized in that: The ammonia outlet valve assembly (91) comprises: an ammonia outlet valve body (911), a third valve seat (912), a fourth valve seat (914), an ammonia outlet valve (913) and an ammonia outlet valve spring (915); The ammonia outlet valve body (911) is provided with a first hydrogen outlet hole (9111) and a second valve seat mounting hole (9112) which are connected to each other; The fourth valve seat (914) is assembled in the second valve seat mounting hole (9112), and the second hydrogen fuel flow channel (9141) inside the fourth valve seat (914) is connected to the first hydrogen outlet hole (9111); One end of the third valve seat (912) extends into the second valve seat mounting hole (9112); The ammonia outlet valve (913) is placed on the third valve seat (912) and can block the hydrogen outlet channel (9121) of the third valve seat (912); The ammonia outlet valve spring (915) is installed between the fourth valve seat (914) and the ammonia outlet valve (913); The fourth valve seat (914) is provided with a second hydrogen outlet hole (9142) for connecting the second valve seat mounting hole (9112) and the second hydrogen fuel flow channel (9141) inside the fourth valve seat (914); The ammonia outlet valve body (911) is provided with an external thread (9113) fixedly connected to the plunger sleeve (921) of the plunger pair (92).

11. The ammonia fuel high pressure injection and ignition system according to claim 3, characterized in that: The plunger pair (92) comprises: A plunger sleeve (921) and a plunger (922), wherein the plunger (922) is movably inserted into the plunger sleeve (921), and a plunger cavity (9201) is formed between the plunger (922) and the plunger sleeve (921); The plunger sleeve (921) is provided with the first channel (9211) and the second channel (9212); The plunger sleeve (921) is provided with a second low-pressure ring groove (9213) and a second sealing ring groove (9214) surrounding the plunger (922); The plunger sleeve (921) is also provided with a third channel (9215) communicating with the second sealing ring groove (9214), and the third channel (9215) is used for introducing external sealing oil; The second low-pressure ring groove (9213) is in communication with the second channel (9212); A third sealing ring (9216) is installed between the plunger sleeve (921) and the plunger (922); The second low-pressure ring groove (9213) is located below the plunger cavity (9201), the second sealing ring groove (9214) is located below the second low-pressure ring groove (9213), and the third sealing ring (9216) is located below the second sealing ring groove (9214).

12. The ammonia fuel high pressure injection and ignition system according to claim 1, characterized in that: The first purge valve (11) comprises: a first valve body (1101), a fifth valve seat (1102), a first pneumatic valve (1103), a first pneumatic valve seat (1104), a first valve cover (1105), a first spring (1106) and a safety valve (1107); The fifth valve seat (1102) is assembled in the first valve body (1101), a purge gas intake passage (1110) is formed in the first valve body (1101) and the fifth valve seat (1102), and an outlet of the purge gas intake passage (1110) is connected to the ammonia fuel common rail pipe (7); The safety valve (1107) is mounted on the first valve body (1101), and an air inlet of the safety valve (1107) is in communication with the purge gas inlet passage (1110); One end of the first pneumatic valve seat (1104) extends into the first valve body (1101) and presses the fifth valve seat (1102); One end of the first pneumatic valve (1103) is movably mounted in a mounting cavity formed between the first pneumatic valve seat (1104) and the first valve cover (1105), and the other end passes through the first pneumatic valve seat (1104) and extends into the fifth valve seat (1102); The first spring (1106) is connected between the first valve cover (1105) and the first pneumatic valve (1103); The first pneumatic valve seat (1104) and the first valve cover (1105) together form a first air intake passage (1108), and the outlet of the first air intake passage (1108) is connected to a first cavity (1109) formed between the first pneumatic valve (1103) and the first pneumatic valve seat (1104); compressed air is introduced into the first air intake passage (1108), and after the compressed air enters the first cavity (1109), the first pneumatic valve (1103) is pushed to release the blockage of the purge gas intake passage (1110), and the purge gas enters the ammonia fuel common rail pipe (7) through the purge gas intake passage (1110).

13. The ammonia fuel high pressure injection and ignition system according to claim 1, characterized in that: The second purge valve (13) comprises: a second valve body (1301), a sixth valve seat (1302), a second pneumatic valve (1303), a second pneumatic valve seat (1304), a second valve cover (1305) and a second spring (1306); The sixth valve seat (1302) is assembled in the second valve body (1301), a purge gas outlet channel (1309) is formed in the second valve body (1301) and the sixth valve seat (1302), and an inlet of the purge gas outlet channel (1309) is connected to the ammonia fuel common rail pipe (7); One end of the second pneumatic valve seat (1304) extends into the second valve body (1301) and presses the sixth valve seat (1302); One end of the second pneumatic valve (1303) is movably mounted in a mounting cavity formed between the second pneumatic valve seat (1304) and the second valve cover (1305), and the other end passes through the second pneumatic valve seat (1304) and extends into the sixth valve seat (1302); The second spring (1306) is connected between the second valve cover (1305) and the second pneumatic valve (1303); The second pneumatic valve seat (1304) and the second valve cover (1305) together form a second air inlet channel (1307), and the outlet of the second air inlet channel (1307) is connected to a second cavity (1308) formed between the second pneumatic valve (1303) and the second pneumatic valve seat (1304); By introducing compressed air into the second air inlet passage (1307), after the compressed air enters the second cavity (1308), the second pneumatic valve (1303) is pushed to release the blockage of the purge gas outlet passage (1309), and the residual ammonia fuel in the ammonia fuel common rail pipe (7) is discharged through the purge gas outlet passage (1309) along with the purge gas.

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