A pre-combustion chamber gas nozzle

Abstract

The present invention belongs to the technical field of injection supply systems and specifically discloses a pre-combustion chamber gas nozzle designed with a dual-opening valve, namely a sealing seat and an intake valve assembly. A design scheme in which the opening pressure P1 of the sealing seat is greater than the opening pressure P2 of the intake valve assembly ensures a clean shutoff of the gas nozzle, preventing residual gas in the pipeline from continuing to enter the pre-combustion chamber through the intake valve assembly after the gas source is shut off. Furthermore, in the event of a seal failure in the intake valve assembly, the sealing seat also functions as a one-way valve, preventing high-temperature, high-pressure exhaust gas from the combustion chamber from entering the gas supply pipeline through the nozzle and causing a safety accident. This improves the reliability of the pre-combustion chamber gas nozzle and the safety of the gas injection system.

Description

Technical Field

[0001] The invention belongs to the technical field of injection supply systems, and in particular relates to a pre-combustion chamber gas nozzle. Background Art

[0002] With the gradual implementation of mandatory regulations on pollutant and greenhouse gas emissions from ships, the new regulations set extremely strict limits for NOx, SOx, and particulate matter in exhaust gas, generating strong market demand for clean power. Gas and dual-fuel engines are gaining popularity due to their ability to use clean, affordable fuels such as natural gas. Unlike diesel, gas fuels like CNG and LPG cannot be compression-ignited and require an ignition system for combustion, with ignition energy typically exceeding 900K. To accelerate heat release from gas combustion, promote multi-dimensional flame propagation, improve thermal efficiency, improve lean burn in gas engines, and avoid knock, cylinder pre-combustion chambers have emerged. Due to the limited size of the cylinder head and the relatively low gas flow required by the pre-combustion chamber, the intake valve opening pressure of the pre-combustion chamber's gas nozzle is designed to be low, making it prone to abrupt shutoff after the gas supply is cut off. Furthermore, failure of the sealing seat of existing pre-combustion chamber gas nozzles can directly lead to exhaust backflow into the combustion chamber. Summary of the Invention

[0003] The object of the present invention is to provide a pre-combustion chamber gas nozzle to solve the problems in the prior art of the gas nozzle that the gas is not cut off cleanly and the exhaust gas from the combustion chamber is caused to flow back after the sealing seat fails.

[0004] In order to achieve the above-mentioned purpose, the technical solution of the present invention is: a pre-combustion chamber gas nozzle, comprising a nozzle upper body, a nozzle lower body, a sealing seat, a mounting seat, an elastic reset member and an intake valve assembly, the inlet of the nozzle upper body is connected to the intake pipe, the outlet of the nozzle upper body is connected to the inlet of the nozzle lower body, and the outlet of the nozzle lower body is connected to the intake valve assembly; the sealing seat is installed at the outlet position of the nozzle upper body, the mounting seat is installed at the inlet position of the nozzle lower body, and the two sides of the elastic reset member are respectively connected to the mounting seat and the sealing seat; a sliding hole is provided at the outlet position of the nozzle upper body, the sliding hole is opposite to the central hole in the nozzle upper body, and the opening area of ​​the sliding hole is larger than the area of ​​the central hole at the outlet position of the nozzle upper body, so A first annular conical hole is arranged between the sliding hole and the center hole at the outlet position of the nozzle upper body, the large diameter end of the first annular conical hole is connected to the sliding hole, and the small diameter end is connected to the center hole in the nozzle upper body; the sealing seat includes a sealing body and an air inlet disk, one side of the sealing body is provided with a sealing spherical surface that cooperates with the first annular conical hole, and the elastic reset part is used to press the sealing spherical surface against the first annular conical hole; the air inlet disk is located at the outer periphery of the sealing body, the air inlet disk can be slidably connected in the sliding hole, and the air inlet disk is provided with a plurality of air inlet holes; the mounting seat is provided with an air outlet hole, and the air outlet hole is connected to the center hole of the nozzle lower body; the opening pressure P1 of the sealing seat to overcome the elastic reset part is greater than the opening pressure P2 of the intake valve assembly.

[0005] Furthermore, the air intake disc is provided with a plurality of groups of air intake protrusions in the circumferential direction, each group of the air intake protrusions is provided with the air intake holes, and an air intake ring connected to the central hole of the nozzle upper body is formed between two adjacent groups of air intake protrusions.

[0006] Furthermore, a mounting hole is provided at the inlet position of the nozzle lower body, the mounting hole is opposite to the center hole in the nozzle lower body and the opening area of ​​the mounting hole is larger than the area of ​​the center hole in the nozzle lower body; the mounting seat includes a mounting body and a mounting plate, the mounting body is located in the center hole of the mounting plate, the mounting body and the mounting plate form a T-shape, and the air outlet is provided at the center of the mounting body; the mounting plate is installed in the mounting hole and is against the bottom of the mounting hole, and the air outlet is opposite to the center hole in the nozzle lower body; a plurality of groups of air outlet protrusions are provided in the circumference of the mounting plate, and an air outlet cavity connected to the center hole in the nozzle lower body is provided in the circumference of the mounting plate, and an air outlet missing ring connected to the center hole in the nozzle lower body is formed between two adjacent groups of the air outlet protrusions; the air outlet protrusion is fitted with the side wall of the mounting hole.

[0007] Furthermore, the mounting plate is provided with a first mounting ring groove for mounting an elastic reset member.

[0008] Furthermore, two sets of sealing ring grooves are provided on the outer periphery of the nozzle upper body, and sealing rings are respectively installed in the sealing ring grooves, and the sealing ring grooves are respectively located on both sides of the cylinder head leakage detection hole.

[0009] Furthermore, a connecting hole is provided on the side of the mounting hole away from the center hole of the lower body of the nozzle, the opening area of ​​the connecting hole is larger than the mounting hole, and the connecting hole is used to connect the upper body of the nozzle; the end face of the connecting hole is provided with a second mounting ring groove, a metal pad is installed in the second mounting ring groove, a through hole is provided in the center of the metal pad, and the central axis of the through hole coincides with the central axis of the connecting hole.

[0010] Furthermore, a second annular conical hole is provided at the inlet position of the nozzle upper body, and the opening area of ​​the large diameter end of the second annular conical hole is larger than the center hole at the inlet position of the nozzle upper body; the second annular conical hole is used to connect the air intake pipe, and the ball head of the air intake pipe is sealed and matched with the second annular conical hole.

[0011] Furthermore, a filter is provided in the center hole at the inlet position of the nozzle upper body.

[0012] Furthermore, the outlet position of the lower body of the nozzle is provided with a first external thread, which can be threadedly connected to the first internal thread on the cylinder head; the side of the first external thread away from the outlet position of the lower body of the nozzle is provided with an annular cone surface matching the conical seat hole on the cylinder head, and the small diameter end of the annular cone surface is connected to the first external thread; the inlet position of the upper body of the nozzle is provided with a second external thread, which can be threadedly connected to the second internal thread of the nut provided with the intake pipe; the inlet position of the lower body of the nozzle is provided with a third internal thread, and the outlet position of the upper body of the nozzle is provided with a third external thread, and the third internal thread and the third external thread are threadedly connected.

[0013] Furthermore, an outer hexagonal structure is provided on the upper body of the nozzle, and flat surface structures are provided on both sides of the lower body of the nozzle.

[0014] The working principle of this technical solution is:

[0015] Gas Nozzle Installation to the Engine: The gas nozzle is installed by tightening the first external thread on the nozzle's lower body to the first internal threaded hole on the cylinder head. After tightening the installation torque, the annular conical surface on the nozzle's lower body and the tapered seat hole on the cylinder head will form a seal, preventing gas from leaking out of the pre-combustion chamber. After the gas nozzle is installed in the cylinder head, tighten the nut on the intake pipe to the second external thread on the nozzle's upper body, aligning the intake pipe ball head with the second annular conical hole on the nozzle's upper body to form a linear seal and ensure a gas seal.

[0016] Gas intake: After correctly installing the gas nozzle to the cylinder head and connecting the intake pipe, open the gas control valve. The gas will follow the intake pipe into the center hole of the nozzle upper body, and after being purified by the filter, it will continue to rush along the center hole of the nozzle upper body to the sealing seat. When the gas intake pressure P0 is greater than the sealing seat opening pressure P1, the sealing seat will accelerate to open under the thrust of the gas, overcoming the resistance of the elastic reset part; at this time, the gas will quickly pass through the intake ring and intake hole on the sealing seat, quickly enter the nozzle lower body, and rush through the outlet hole, outlet ring and outlet cavity of the mounting seat to the center hole of the nozzle lower body. When the gas pressure P3 in the center hole of the nozzle lower body is greater than the opening pressure P2 of the intake valve assembly, the intake valve assembly opens and the gas enters the cylinder pre-combustion chamber.

[0017] Gas cut-off: When the piston in the main combustion chamber runs close to the top dead center, the ignition system of the pre-combustion chamber is turned on, the gas control valve is closed, and the intake pipe no longer provides fresh gas. When the gas intake pressure P0 ≤ the sealing seat opening pressure P1, the sealing seat is closed, and no fresh gas is replenished into the gas nozzle lower body. At this time, the gas pressure P3 in the nozzle lower body will drop rapidly until P3 ≤ the opening pressure P2 of the intake valve assembly. The intake valve assembly is closed and the gas no longer enters the pre-combustion chamber.

[0018] The beneficial effects of this technical solution are:

[0019] 1. The system is designed with dual opening valves: the sealing seat (opening pressure P1) and the intake valve assembly (opening pressure P2). The P1>P2 design ensures clean shutoff of the gas nozzle, preventing residual gas in the pipeline from entering the pre-combustion chamber through the intake valve assembly after the gas source is shut off. Furthermore, in the event of a seal failure in the intake valve assembly, the sealing seat also acts as a one-way valve, preventing high-temperature, high-pressure exhaust gas from the combustion chamber from entering the gas supply pipeline through the nozzle and potentially causing a safety accident. This improves the reliability of the pre-combustion chamber gas nozzle and the safety of the gas injection system.

[0020] 2. The sealing seat adopts a special-shaped design, with circumferentially distributed intake rings and intake holes, all of which are through holes, to ensure that after the sealing seat is installed into the sliding hole in the nozzle upper body with a small gap (millimeter level), there is sufficient gas flow area to meet the pre-combustion chamber's demand for gas flow; under the extrusion of the elastic reset part, the sealing seat forms a ring line seal in the fitting section through the sealing spherical surface and the first annular cone hole in the nozzle upper body. The ring line seal reduces the sealing area, increases the sealing pressure ratio, and is more conducive to gas sealing.

[0021] 3. The center hole of the mounting seat has an air outlet ring and an air outlet cavity on the circumference, both of which are through holes to ensure that after the mounting seat is installed into the mounting hole of the lower body of the nozzle with a small gap (millimeter level), there is sufficient gas flow area to ensure that the gas flow can meet the combustion requirements of the pre-combustion chamber.

[0022] 4. A second mounting ring groove for mounting a metal gasket is provided in the nozzle lower body to ensure that the metal gasket remains in a fixed position during the process of threaded connection between the nozzle upper body and the nozzle lower body, so as to avoid the metal gasket from blocking the flow area of ​​the center hole of the nozzle lower body due to incorrect position or causing part of the end face of the nozzle upper body to not fully contact with the metal gasket, thereby affecting the gas seal and causing gas leakage, thereby improving the reliability and safety of the product.

[0023] 5. Sealing ring grooves are provided on the outer periphery of the nozzle upper body on both sides of the cylinder head leakage detection hole to ensure that after the gas nozzle is installed on the cylinder head, the sealing ring grooves are exactly on both sides of the cylinder head gas leakage detection channel. Once the gas passes through the metal gasket and leaks into the cylinder head through the meshing gap between the third external thread and the third internal thread, and the sealing ring in the first sealing ring groove fails to seal, the leaked gas will be immediately detected by the sensor in the cylinder head gas leakage detection channel, thereby triggering a safety alarm to avoid gas leaking into the atmosphere through the second sealing ring and causing a safety accident, thereby improving the safety of the gas engine operating environment. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 This is a schematic diagram of the internal structure of a pre-combustion chamber gas nozzle of the present invention;

[0025] Figure 2 for Figure 1 Schematic diagram of the structure of the upper body of the middle nozzle;

[0026] Figure 3 for Figure 1 A three-dimensional view of the lower body of the middle nozzle;

[0027] Figure 4 for Figure 3 A top partial sectional view of

[0028] Figure 5 for Figure 1 A three-dimensional view of the middle sealing seat;

[0029] Figure 6 for Figure 5 The main view;

[0030] Figure 7 for Figure 5 A top view of

[0031] Figure 8 for Figure 1 A perspective view of the middle mount;

[0032] Figure 9 for Figure 8 The main view;

[0033] Figure 10 for Figure 8 A side sectional view of

[0034] Figure 11 for Figure 1 Schematic diagram of the structure of the middle intake valve assembly;

[0035] Figure 12 This is the state diagram when the intake valve assembly and the sealing seat are both open and the pre-combustion chamber is intake;

[0036] Figure 13 This is a state diagram when the intake valve assembly is open, the sealing seat is closed, and the gas nozzle is cut off;

[0037] Figure 14 This is the state diagram when the intake valve assembly and the sealing seat are closed and the pre-combustion chamber intake is completed. DETAILED DESCRIPTION

[0038] The following is further described in detail through specific implementation methods:

[0039] The figure marks in the drawings of the specification include: nozzle upper body 1, nozzle lower body 2, sealing seat 3, mounting seat 4, elastic return part 5, intake valve assembly 6, sealing ring 7, cylinder head leakage detection hole 8, filter 9, second external thread 10, first external thread 11, second annular tapered hole 12, annular conical surface 13, flat surface structure 14, external hexagonal structure 15, sliding hole 16, first annular tapered hole 17, sealing body 18, intake disc 19, sealing spherical surface 20, intake protrusion 21, intake hole 22, intake missing ring 23, mounting hole 24, mounting body 25, mounting disc 26, outlet hole 27, outlet protrusion 28, outlet cavity 29, outlet missing ring 30, connecting hole 31, second mounting ring groove 32, metal pad 33, first mounting ring groove 34, sealing ring groove 35.

[0040] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0041] The embodiment is basically as shown in the attached Figure 1-14 As shown: a pre-combustion chamber gas nozzle, such as Figure 1 As shown, it includes a nozzle upper body 1, a nozzle lower body 2, a sealing seat 3, a mounting seat 4, an elastic reset member 5 (specifically a reset spring) and an intake valve assembly 6 (as shown in FIG. Figure 11 As shown, the specific structure is shown in 202111034903.8), the inlet of the nozzle upper body 1 is connected to the air inlet pipe, and the outlet of the nozzle upper body 1 is connected to the inlet of the nozzle lower body 2. Specifically, the connecting hole 31 at the inlet position of the nozzle lower body 2 is provided with a third internal thread (see Figure 4), the outlet position of the nozzle upper body 1 is provided with a third external thread, and the third internal thread and the third external thread are threadedly connected. Figure 1-4 As shown, the upper nozzle body 1 is provided with an outer hexagonal structure 15, and the two sides of the lower nozzle body 2 are provided with flat surface structures 14. Use a clamp to clamp the flat surface structures 14 on both sides of the lower nozzle body 2, and then use a torque sleeve to cover the outer hexagon of the upper nozzle body 1, and tighten it by torque. The outlet of the lower nozzle body 2 is connected to the intake valve assembly 6, specifically using an interference fit. The sealing seat 3 is installed at the outlet position of the upper nozzle body 1, and the mounting seat 4 is installed at the inlet position of the lower nozzle body 2. The two sides of the elastic reset member 5 are respectively connected to the mounting seat 4 and the sealing seat 3 and are in a compressed state. The opening pressure P1 of the sealing seat 3 to overcome the elastic reset member 5 is greater than the opening pressure P2 of the intake valve assembly 6.

[0042] like Figure 2 As shown, a sliding hole 16 is provided at the outlet position of the nozzle upper body 1, the sliding hole 16 is opposite to the center hole in the nozzle upper body 1 and the opening area of ​​the sliding hole 16 is larger than the area of ​​the center hole at the outlet position of the nozzle upper body 1, and a first annular tapered hole 17 is provided between the sliding hole 16 and the center hole at the outlet position of the nozzle upper body 1, the large diameter end of the first annular tapered hole 17 is connected to the sliding hole 16, and the small diameter end is connected to the center hole in the nozzle upper body 1.

[0043] like Figure 5-7 As shown, the sealing seat 3 includes a sealing body 18 and an air inlet disc 19. A sealing spherical surface 20 is provided on one side of the sealing body 18, which mates with the first annular tapered hole 17. The compressive force of the elastic reset member 5 presses the sealing spherical surface 20 into the first annular tapered hole 17. The air inlet disc 19 is located on the outer periphery of the sealing body 18 and is slidably connected to the sliding hole 16. Several groups of air inlet protrusions 21 are provided around the circumference of the air inlet disc 19. Each group of air inlet protrusions 21 is provided with an air inlet hole 22. Adjacent groups of air inlet protrusions 21 form an air inlet ring 23 that communicates with the central hole of the nozzle upper body 1.

[0044] like Figure 1 、 2 As shown, two sets of sealing ring grooves 35 are provided on the outer periphery of the nozzle upper body 1 , and sealing rings 7 are respectively installed in the sealing ring grooves 35 . The sealing ring grooves 35 are respectively located on both sides of the cylinder head leakage detection hole 8 .

[0045] like Figure 1 、 2 As shown, a second annular tapered hole 12 is provided at the inlet of the nozzle upper body 1. The opening area of ​​the large-diameter end of the second annular tapered hole 12 is larger than the center hole at the inlet of the nozzle upper body 1. The ball head of the air inlet pipe seals with the second annular tapered hole 12. A filter screen 9 is provided in the center hole at the inlet of the nozzle upper body 1.

[0046] like Figure 3 、 4As shown, a mounting hole 24 is provided at the inlet of the nozzle lower body 2. The mounting hole 24 is directly opposite to the center hole in the nozzle lower body 2 and the opening area of ​​the mounting hole 24 is larger than the area of ​​the center hole in the nozzle lower body 2. Figure 8-10 As shown, the mounting base 4 includes a mounting body 25 and a mounting plate 26. The mounting body 25 is located within the center hole of the mounting plate 26, forming a T-shape with the mounting body 25. An air outlet 27 is provided in the center of the mounting body 25, which communicates with the center hole of the nozzle lower body 2. The mounting plate 26 is mounted within the mounting hole 24 and abuts against the bottom of the mounting hole 24, with the air outlet 27 facing the center hole of the nozzle lower body 2. Several groups of air outlet protrusions 28 are provided around the circumference of the mounting plate 26. Air outlet cavities 29 (in this embodiment, oblique cavities) are provided around the circumference of the mounting plate 26, which communicate with the center hole of the nozzle lower body 2. Adjacent groups of air outlet protrusions 28 form an air outlet gap 30, which communicates with the center hole of the nozzle lower body 2. The air outlet protrusions 28 are in contact with the sidewalls of the mounting hole 24.

[0047] like Figure 4 As shown, a connecting hole 31 is provided on the side of the mounting hole 24 away from the center hole of the nozzle lower body 2. The opening area of ​​the connecting hole 31 is larger than the mounting hole 24. The connecting hole 31 is used to connect the nozzle upper body 1; a second mounting ring groove 32 is provided on the end face of the connecting hole 31, and a metal pad 33 (specifically a copper pad) is installed in the second mounting ring groove 32. A through hole is provided in the center of the metal pad 33, and the central axis of the through hole coincides with the central axis of the connecting hole 31.

[0048] like Figure 8-10 As shown, the mounting plate 26 is provided with a first mounting annular groove 34 for mounting the elastic return element 5. The first mounting annular groove 34 and the outer circumference of the first ring of the elastic return element 5 are formed in a transitional fit to ensure that the elastic return element 5 fits neatly into the first mounting annular groove 34 with no excess clearance or even a slight interference fit. This ensures that the elastic return element 5 maintains a stable position during reciprocating compression. The depth of the first mounting annular groove 34 is less than the height of the first ring of the elastic return element 5.

[0049] like Figure 1 As shown, the outlet of the nozzle lower body 2 is provided with a first external thread 11, which can be threadedly connected to the first internal thread on the cylinder head. The side of the first external thread 11 away from the outlet of the nozzle lower body 2 is provided with an annular cone 13 that matches the tapered seat hole in the cylinder head, and the smaller diameter end of the annular cone 13 butts against the first external thread 11. The inlet of the nozzle upper body 1 is provided with a second external thread 10, which can be threadedly connected to the second internal thread of the nut provided with the intake pipe.

[0050] The specific implementation process is as follows:

[0051] Gas Nozzle Installation to the Engine: The gas nozzle is installed by tightening the first external thread 11 of the nozzle lower body 2 to the first internal thread hole in the cylinder head. After tightening the installation torque, the annular conical surface 13 of the nozzle lower body 2 and the tapered seat hole in the cylinder head will form a seal, preventing gas from escaping the pre-combustion chamber. After the gas nozzle is installed in the cylinder head, the nut provided with the intake pipe is tightened to the second external thread 10 of the nozzle upper body 1, and the intake pipe ball head is tightly attached to the second annular conical hole 12 of the nozzle upper body 1 to form a line seal and ensure a gas tight seal.

[0052] Gas intake: After correctly installing the gas nozzle to the cylinder head and connecting the intake pipe, open the gas control valve. The gas will follow the intake pipe into the center hole of the nozzle upper body 1, and after being purified by the filter 9, it will continue to rush along the center hole of the nozzle upper body 1 to the sealing seat 3. When the gas intake pressure P0 is greater than the opening pressure P1 of the sealing seat 3, the sealing seat 3 will overcome the resistance of the elastic reset part 5 and accelerate to open under the thrust of the gas; at this time, the gas will quickly pass through the intake ring 23 and the intake hole 22 on the sealing seat 3, and quickly enter the nozzle lower body 2, and rush to the center hole of the nozzle lower body 2 through the outlet hole 27, the outlet ring 30 and the outlet cavity 29 of the mounting seat 4. When the gas pressure P3 in the center hole of the nozzle lower body 2 is greater than the opening pressure P2 of the intake valve assembly 6, the intake valve assembly 6 opens, and the gas enters the cylinder pre-combustion chamber, such as Figure 12 shown.

[0053] Gas cut-off: When the main combustion chamber piston moves to near the top dead center, the ignition system of the pre-combustion chamber is turned on, the gas control valve is closed, and the intake pipe no longer provides fresh gas. When the gas intake pressure P0 ≤ the sealing seat 3 opening pressure P1, the sealing seat 3 is closed. Figure 13 As shown, the gas nozzle no longer has fresh gas added to the nozzle lower body 2. At this time, the gas pressure P3 in the nozzle lower body 2 will drop rapidly until P3 ≤ the opening pressure P2 of the intake valve assembly 6. The intake valve assembly 6 is closed and the gas no longer enters the pre-combustion chamber. Figure 14 shown.

[0054] It should be noted that, in this document, relational terms such as first and second, etc., are used only to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the terms "comprises," "comprising," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that includes a list of elements includes not only those elements but also other elements not explicitly listed, or elements inherent to such process, method, article, or apparatus.

[0055] The above is only an embodiment of the present invention. Common knowledge such as the known specific structures and characteristics in the scheme is not described in detail here. Ordinary technicians in the field are aware of all common technical knowledge in the technical field of the invention before the application date or priority date, can obtain all existing technologies in the field, and have the ability to apply conventional experimental means before that date. Ordinary technicians in the field can improve and implement this scheme in combination with their own abilities under the inspiration given by this application. Some typical known structures or known methods should not become obstacles for ordinary technicians in the field to implement this application. It should be pointed out that for those skilled in the art, without departing from the structure of the present invention, several variations and improvements can be made, which should also be regarded as the scope of protection of the present invention. These will not affect the effect of the implementation of the present invention and the practicality of the patent. The scope of protection required by this application shall be based on the content of its claims, and the specific implementation methods and other records in the specification can be used to interpret the content of the claims.

Claims

1. A pre-combustion chamber gas nozzle, characterized in that: The invention comprises a nozzle upper body (1), a nozzle lower body (2), a sealing seat (3), a mounting seat (4), an elastic reset member (5) and an air intake valve assembly (6), wherein the inlet of the nozzle upper body (1) is connected to the air intake pipe, the outlet of the nozzle upper body (1) is connected to the inlet of the nozzle lower body (2), and the outlet of the nozzle lower body (2) is connected to the air intake valve assembly (6); the sealing seat (3) is installed at the outlet position of the nozzle upper body (1), the mounting seat (4) is installed at the inlet position of the nozzle lower body (2), and the elastic reset member (5) is installed at the outlet position of the nozzle upper body (1). ) are connected to the mounting seat (4) and the sealing seat (3) on both sides respectively; a sliding hole (16) is provided at the outlet position of the nozzle upper body (1), the sliding hole (16) is directly opposite to the center hole in the nozzle upper body (1) and the opening area of ​​the sliding hole (16) is larger than the area of ​​the center hole at the outlet position of the nozzle upper body (1), a first annular tapered hole (17) is provided between the sliding hole (16) and the center hole at the outlet position of the nozzle upper body (1), the large diameter end of the first annular tapered hole (17) is connected to the sliding hole (16), and the small diameter end is connected to the nozzle upper body (1); the sealing seat (3) includes a sealing body (18) and an air inlet disc (19); one side of the sealing body (18) is provided with a sealing spherical surface (20) that matches the first annular conical hole (17); the elastic reset member (5) is used to press the sealing spherical surface (20) into the first annular conical hole (17); the air inlet disc (19) is located on the outer periphery of the sealing body (18), the air inlet disc (19) can be slidably connected in the sliding hole (16), and the air inlet disc (19) is provided with a plurality of air inlet holes (22 ); the air inlet disc (19) is provided with a plurality of groups of air inlet protrusions (21) in the circumferential direction, each group of the air inlet protrusions (21) is provided with the air inlet hole (22), and an air inlet missing ring (23) connected to the central hole of the nozzle upper body (1) is formed between two adjacent groups of air inlet protrusions (21); the mounting seat (4) is provided with an air outlet hole (27), and the air outlet hole (27) is connected to the central hole of the nozzle lower body (2); the opening pressure P1 of the sealing seat (3) to overcome the elastic reset member (5) is greater than the opening pressure P2 of the air inlet valve assembly (6).

2. A pre-combustion chamber gas nozzle according to claim 1, characterized in that: The inlet position of the nozzle lower body (2) is provided with a mounting hole (24), the mounting hole (24) is directly opposite to the center hole in the nozzle lower body (2) and the opening area of ​​the mounting hole (24) is larger than the area of ​​the center hole in the nozzle lower body (2); the mounting seat (4) comprises a mounting body (25) and a mounting plate (26), the mounting body (25) is located in the center hole of the mounting plate (26), the mounting body (25) and the mounting plate (26) form a T-shape, and the air outlet (27) is provided at the center of the mounting body (25); the mounting plate ( 26) is installed in the mounting hole (24) and abuts against the bottom of the mounting hole (24), and the air outlet hole (27) is directly opposite to the center hole in the lower body (2) of the nozzle; a plurality of groups of air outlet protrusions (28) are provided on the circumference of the mounting plate (26), and an air outlet cavity (29) connected to the center hole in the lower body (2) of the nozzle is provided on the circumference of the mounting plate (26), and an air outlet ring (30) connected to the center hole in the lower body (2) of the nozzle is formed between two adjacent groups of the air outlet protrusions (28); the air outlet protrusions (28) are in contact with the side wall of the mounting hole (24).

3. A pre-combustion chamber gas nozzle according to claim 2, characterized in that: The mounting plate (26) is provided with a first mounting ring groove (34) for mounting the elastic reset member (5).

4. The pre-combustion chamber gas nozzle according to claim 1, characterized in that: Two sets of sealing ring grooves (35) are provided on the outer periphery of the nozzle upper body (1), and sealing rings (7) are respectively installed in the sealing ring grooves (35). The sealing ring grooves (35) are respectively located on both sides of the cylinder head leakage detection hole (8).

5. The pre-combustion chamber gas nozzle according to claim 2, characterized in that: A connecting hole (31) is provided on a side of the mounting hole (24) away from the central hole of the nozzle lower body (2), the opening area of ​​the connecting hole (31) is larger than that of the mounting hole (24), and the connecting hole (31) is used to connect the nozzle upper body (1); a second mounting ring groove (32) is provided on the end face of the connecting hole (31), a metal pad (33) is installed in the second mounting ring groove (32), a through hole is provided at the center of the metal pad (33), and the central axis of the through hole coincides with the central axis of the connecting hole (31).

6. The pre-combustion chamber gas nozzle according to claim 1, characterized in that: A second annular conical hole (12) is provided at the inlet position of the nozzle upper body (1), and the opening area of ​​the large-diameter end of the second annular conical hole (12) is larger than the center hole at the inlet position of the nozzle upper body (1); the second annular conical hole (12) is used to connect the air intake pipe, and the ball head of the air intake pipe is sealed and matched with the second annular conical hole (12).

7. The pre-combustion chamber gas nozzle according to claim 6, characterized in that: A filter screen (9) is provided in the central hole at the inlet position of the nozzle upper body (1).

8. The pre-combustion chamber gas nozzle according to claim 1, characterized in that: The outlet position of the nozzle lower body (2) is provided with a first external thread (11), and the first external thread (11) can be threadedly connected to the first internal thread on the cylinder head; the first external thread (11) is provided with an annular cone (13) matching the conical seat hole on the cylinder head on the side away from the outlet position of the nozzle lower body (2), and the small diameter end of the annular cone (13) is connected to the first external thread (11); the inlet position of the nozzle upper body (1) is provided with a second external thread (10), and the second external thread (10) can be threadedly connected to the second internal thread of the nut provided with the intake pipe; the inlet position of the nozzle lower body (2) is provided with a third internal thread, and the outlet position of the nozzle upper body (1) is provided with a third external thread, and the third internal thread and the third external thread are threadedly connected.

9. The pre-combustion chamber gas nozzle according to claim 8, characterized in that: The nozzle upper body (1) is provided with an outer hexagonal structure (15), and the two sides of the nozzle lower body (2) are provided with flat surface structures (14).

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