Pre-combustion chamber device and engine

Abstract

The utility model discloses a pre-combustion chamber device and an engine, and relates to the technical field of engineering machinery. An air inlet pipe, a distribution cavity and a pre-combustion chamber assembly; the pre-combustion chamber assembly comprises a pre-combustion chamber body and a lining assembly which are connected, a pre-combustion chamber is formed in an inner cavity of the pre-combustion chamber body, and a spark plug and a one-way valve which are isolated are connected into the lining assembly. The air inlet pipe communicates with the distribution cavity through the air taking pipe, the distribution cavity communicates with the one-way valve through the distribution pipe, and the one-way valve can communicate with the air inlet pipe and the pre-combustion chamber. An airflow channel for communicating the one-way valve with the sparking plug is formed in the lining assembly, so that mixed gas in the gas inlet pipe flows through the airflow channel through the one-way valve to scavenge the sparking plug; by means of the arrangement, the pressure difference between the air inlet pipe and the interior of the air cylinder can be utilized, equivalent mixed gas can be taken from the air inlet pipe to serve as a scavenging working medium, a proper amount of combustible mixed gas is provided for the precombustion chamber, and directional scavenging of a spark plug can be achieved.

Description

Technical Field

[0001] The utility model belongs to the technical field of construction machinery, and particularly relates to a pre-chamber device and an engine. Background Technique

[0002] Compared with the passive pre-chamber, the natural gas active pre-chamber has more sufficient scavenging in the pre-chamber and less exhaust gas, and has more advantages in reducing gas consumption, emissions, exhaust temperature and improving transient response. The active pre-chamber can be used for lean burn engines and stoichiometric combustion engines. In the prior art, the active pre-chamber mostly uses jet gas for scavenging or high-pressure mixture for scavenging. Among them, jet gas for scavenging is more suitable for the lean burn mode. Jet gas for scavenging can supplement fuel to improve the combustion capacity of the pre-chamber. However, whether it is jet gas for scavenging or high-pressure mixture for active scavenging, since the one-way valve and the spark plug in the cylinder are arranged in parallel, after the high-pressure mixture is output from one side of the one-way valve, it directly impacts the pre-chamber below the spark plug under the action of high pressure, and the scavenging of the area near the spark plug, especially near the electrode position, is not thorough, and the spark plug cannot be directly scavenged. Therefore, the scavenging effect of the root part of the spark plug is poor. If there is too much exhaust gas remaining, it will greatly affect the initial ignition and jet process inside the pre-chamber, resulting in unstable engine combustion and reduced work capacity. Summary of the Utility Model

[0003] The utility model provides a pre-chamber device and an engine to solve the problem that the active scavenging scheme in the prior art cannot directly scavenge the spark plug, especially the scavenging near the electrode position of the spark plug is not thorough, resulting in exhaust gas remaining and affecting the initial ignition and jet process inside the pre-chamber, and further leading to unstable engine combustion and reduced work capacity.

[0004] The technical solution adopted by the utility model is as follows:

[0005] A pre-chamber device includes:

[0006] An intake pipe, a distribution cavity and a pre-chamber assembly; the pre-chamber assembly includes a pre-chamber main body and a bushing assembly connected to each other. A pre-chamber is formed in the inner cavity of the pre-chamber main body. A spark plug and a one-way valve are connected in the bushing assembly in isolation; the intake pipe is communicated with the distribution cavity through an intake pipe, the distribution cavity is communicated with the one-way valve through a distribution pipe, and the one-way valve can communicate the intake pipe with the pre-chamber; an air flow channel for communicating the one-way valve with the spark plug is opened in the bushing assembly, so that the mixed gas in the intake pipe can flow through the one-way valve and the air flow channel to scavenge the spark plug.

[0007] The pre-chamber device of the utility model also has the following additional technical features:

[0008] The spark plug is connected inside the bushing assembly through a spark plug liner, and one end of the spark plug can extend into the pre-chamber below; the spark plug liner is provided with the air flow channel, and the one-way valve is provided with scavenging holes on the side facing the spark plug, and the scavenging holes are communicated with the air flow channel to form a scavenging channel for purging the spark plug.

[0009] The spark plug is provided with convection holes arranged opposite to the scavenging holes, and the mixed gas is output to the electrode position of the spark plug through the scavenging channel and the convection holes.

[0010] The spark plug is provided with convection grooves arranged opposite to the scavenging holes, and the mixed gas is output to the electrode position of the spark plug through the scavenging channel and the convection grooves.

[0011] The height of the bottom of the one-way valve along the axial direction of the bushing assembly is higher than the height of the bottom of the spark plug along the axial direction of the bushing assembly by a preset distance, so that the air flow flowing out of the one-way valve can impact the electrode position of the spark plug.

[0012] The extension line of the tangent direction of the gas flow output by the one-way valve can intersect with the ignition gap of the spark plug.

[0013] The bushing assembly includes a spark plug bushing and an ignition coil bushing connected to each other; a spark plug and a one-way valve are arranged inside the spark plug bushing, and the distribution pipe can sequentially extend into the ignition coil bushing, the spark plug bushing and be connected to the one-way valve; an ignition coil connected to the spark plug is arranged inside the ignition coil bushing.

[0014] The distribution cavity has a plurality of output ports, and each output port can be respectively connected with a corresponding distribution pipe, and the mixed gas in the intake pipe flows to different pre-chambers through the distribution pipe.

[0015] An air intake port for communicating with the air extraction pipe is arranged on the downstream side of the intake pipe.

[0016] This application also relates to an engine, including a turbocharger, a cylinder, and a pre-chamber device as described above connected inside the cylinder. The turbocharger includes a compressor and a turbine. The compressor is connected to the intake pipe to supply air to the intake pipe, and the turbine is connected to the exhaust pipe of the cylinder for exhausting tail gas.

[0017] Due to the adoption of the above technical solutions, the beneficial effects obtained by the present utility model are:

[0018] 1. A pre - combustion chamber device of the present application includes an intake pipe, a distribution cavity, and a pre - combustion chamber assembly. The pre - combustion chamber assembly includes a pre - combustion chamber main body and a bushing assembly connected to each other. A pre - combustion chamber is formed inside the pre - combustion chamber main body. A spark plug and a check valve are connected and isolated inside the bushing assembly, and the check valve can connect the intake pipe and the pre - combustion chamber. Specifically, the intake pipe, as a structural member capable of providing combustible mixture for the main combustion chamber and the pre - combustion chamber, is connected to a pick - up pipe, the pick - up pipe is connected to the distribution cavity, and the distribution cavity is connected to the check valve through a distribution pipe, so that the combustible mixture in the intake pipe can flow through the pick - up pipe, the distribution cavity, the distribution pipe, and the check valve to the pre - combustion chamber in sequence. Through the above - mentioned setting, not only can the pressure difference between the intake pipe and the cylinder be utilized to take the equivalent mixture from the intake pipe as the scavenging working medium to provide an appropriate amount of combustible mixture for the pre - combustion chamber, but also the directional scavenging of the spark plug can be realized.

[0019] In addition, an air flow channel for connecting the check valve and the spark plug is opened inside the bushing assembly, so that the mixed gas in the intake pipe can flow through the check valve and the air flow channel to scavenge the spark plug, thereby avoiding the incomplete scavenging near the spark plug caused by the traditional scavenging structure, being able to avoid the poor scavenging effect of the root part of the spark plug, being able to directly scavenge the spark plug, improving the scavenging effect of the root part of the spark plug, reducing the influence on the initial ignition and jet process inside the pre - combustion chamber, improving the combustion stability of the engine and the work - doing ability of the engine.

[0020] 2. As a preferred embodiment of the present utility model, the spark plug is connected to the bushing assembly through a spark plug liner, and one end of the spark plug can extend into the lower pre - combustion chamber; the spark plug liner is provided with an air flow channel, and the check valve is provided with a scavenging hole on the side facing the spark plug, and the scavenging hole is connected to the air flow channel to form a scavenging channel for purging the spark plug.

[0021] The spark plug is fixedly connected to the bushing assembly through the spark plug liner. The first function of the spark plug liner is to connect and fix the spark plug to achieve stable ignition; the second function is to be able to open an air flow channel so that the air flow channel is connected to the scavenging hole of the check valve to form a scavenging channel; thus, after the check valve is opened, the combustible mixture in the distribution pipe can flow through the check valve into the pre - combustion chamber, and a part of the combustible mixture can also flow through the air flow channel connected to the scavenging hole of the check valve to the spark plug, and the air flow flows along the spark plug into the pre - combustion chamber below the spark plug, realizing the direct scavenging of the spark plug, achieving the full scavenging of the root part of the spark plug, helping to thoroughly remove the remaining exhaust gas near the spark plug, improving the ignition performance, and improving the stability of combustion.

[0022] 3. As a preferred embodiment of the present utility model, the spark plug is provided with a convection hole opposite to the scavenging hole, and the mixed gas is output to the electrode position of the spark plug through the scavenging channel and the convection hole.

[0023] In order to further enhance the scavenging of the combustible mixture near the spark plug and reduce the residual amount of exhaust gas near the spark plug, a convection hole opposite to the scavenging hole can also be provided at one end of the spark plug. The convection hole can enable the mixture gas to be discharged through the scavenging channel and then concentratedly discharged to the spark plug through the convection hole, improving the direct purging of the combustible mixture gas to the spark plug, further realizing the scavenging near the spark plug, including purging the electrode position, reducing the residual amount of exhaust gas, and improving the ignition performance and combustion stability. Moreover, it is also applicable to spark plugs of other structural forms, such as multi-electrode spark plugs. The convection hole is a hole provided at the end of the spark plug and communicating with the inside of the spark plug, which can enable the combustible mixture gas to further enter the vicinity of the spark plug and achieve sufficient scavenging near the spark plug.

[0024] 4. As a preferred embodiment of the present invention, the spark plug is provided with a convection groove opposite to the scavenging hole, and the mixture gas is output to the electrode position of the spark plug through the scavenging channel and the convection groove.

[0025] The ignition gap refers to the distance between the electrodes of the spark plug in the engine ignition system. In order to further improve the scavenging efficiency and achieve thorough cleaning of the exhaust gas near the spark plug, the convection groove can be set so that the air flow can flow along the groove to correspond to the ignition gap of the spark plug, enabling the combustible mixture gas output from the scavenging channel to directly blow towards the ignition gap through the convection hole, and thoroughly purging the vicinity of the spark plug including the electrode position; the convection groove is a groove provided on the circumferential side of the end of the spark plug and not communicating with the inside, which can enable the combustible mixture gas to further enter the vicinity of the spark plug and achieve sufficient scavenging near the spark plug.

[0026] 5. As a preferred embodiment of the present invention, the height of the bottom of the one-way valve along the axis direction of the bushing assembly is higher than the height of the bottom of the spark plug along the axis direction of the bushing assembly by a preset distance, so that the air flow flowing out of the one-way valve can impact the electrode position of the spark plug.

[0027] In addition to providing an air flow channel between the one-way valve and the spark plug, there is also a second embodiment, that is, raising the position of the one-way valve by a preset distance, so that the gas flowing out of the one-way valve can impact the electrode position of the spark plug, which can also further effectively scavenge the vicinity of the spark plug sufficiently, improve the ignition performance of the spark plug, and further improve the combustion stability of the entire pre-chamber device. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] The drawings described herein are used to provide a further understanding of the present invention and constitute a part of the present invention. The schematic embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation to the present invention. In the drawings:

[0029] Figure 1 Structural diagram of a pre - combustion chamber device under an implementation mode of the present utility model;

[0030] Figure 2 Structural diagram of a bushing assembly of a pre - combustion chamber device under an implementation mode of the present utility model;

[0031] Figure 3 Internal structure schematic diagram of a pre - combustion chamber assembly of a pre - combustion chamber device under an implementation mode of the present utility model;

[0032] Figure 4 Structural diagram of a check valve of a pre - combustion chamber device under an implementation mode of the present utility model;

[0033] Figure 5 Structural diagram of a spark plug of a pre - combustion chamber device under an implementation mode of the present utility model;

[0034] Figure 6 Structural diagram of a spark plug of a pre - combustion chamber device under another implementation mode of the present utility model;

[0035] Figure 7 Internal structure schematic diagram of a pre - combustion chamber assembly of a pre - combustion chamber device under another implementation mode of the present utility model;

[0036] In the figure,

[0037] 1. Intake pipe; 2. Distribution cavity;

[0038] 3. Pre - combustion chamber assembly; 31. Pre - combustion chamber body; 32. Bushing assembly; 321. Spark plug bushing; 322. Ignition coil bushing;

[0039] 4. Spark plug; 5. Check valve; 6. Air intake pipe; 7. Distribution pipe; 8. Pre - combustion chamber; 9. Scavenging hole;

[0040] 10. Convection hole; 11. Convection groove;

[0041] 12. Air flow channel, 13. Ignition coil. Specific implementation mode

[0042] Many specific details are set forth in the following description in order to provide a thorough understanding of the present utility model. However, the present utility model may be implemented in other ways different from those described herein. Therefore, the scope of protection of the present utility model is not limited by the specific embodiments disclosed below.

[0043] In addition, in the description of the present utility model, it should be understood that the orientation or positional relationship indicated by terms such as "top", "bottom", "inner", "outer", "axial direction", "radial direction", "circumferential direction", etc. is based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, it should not be construed as a limitation to the present utility model.

[0044] In the present utility model, unless otherwise clearly defined and limited, terms such as "installation", "connection", "connection", "fixation", etc. should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or integrated; it can be a mechanical connection, an electrical connection, or a communication connection; it can be directly connected, or indirectly connected through an intermediate medium, and can be the communication inside two elements or the interaction relationship between two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present utility model can be understood according to specific circumstances.

[0045] In the present utility model, unless otherwise clearly defined and limited, the first feature being "above" or "below" the second feature can be that the first and second features are in direct contact, or the first and second features are indirectly in contact through an intermediate medium. In the description of this specification, the description referring to terms such as "embodiment", "example", "an embodiment", "example", or "specific example", etc. means that the specific features, structures, materials, or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present utility model. In this specification, the schematic expressions of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described can be combined in a suitable manner in any one or more embodiments or examples.

[0046] Explanation of the meaning of terms:

[0047] Pre-chamber: There is an independent space outside the main combustion chamber of the engine as the pre-chamber. The main combustion chamber and the pre-chamber are connected through different numbers of channels. Ignition occurs in the pre-chamber. After the pre-chamber catches fire, high-temperature and high-pressure gas is formed. The high-temperature and high-pressure gas enters the main combustion chamber through the channels and ignites the mixture, forming multi-jet ignition.

[0048] Scavenging: In the field of engines, it usually refers to the process of purging and displacing the combustion exhaust gas with gas or combustible mixture.

[0049] Low-pressure active scavenging: Take the equivalent mixture from the intake pipe as the scavenging working medium, and use the pressure difference between the intake pipe and the cylinder during the intake process to achieve low-pressure active scavenging of the pre-chamber.

[0050] High-pressure active pre-chamber: The scavenging working medium is the supercharged equivalent mixture or high-pressure gas.

[0051] To more clearly illustrate the overall concept of the present utility model, the following will be described in detail by way of examples in conjunction with the accompanying drawings of the specification.

[0052] The present utility model relates to a pre-chamber device, as Figure 1-7 shown, comprising an intake pipe 1, a distribution cavity 2 and a pre-chamber assembly 3; the pre-chamber assembly 3 includes a pre-chamber main body 31 and a bushing assembly 32 connected to each other. A pre-chamber 8 is formed inside the pre-chamber main body 31. A spark plug 4 and a check valve 5 are connected inside the bushing assembly 32 in isolation from each other; the intake pipe 1 is communicated with the distribution cavity 2 through a gas extraction pipe 6, the distribution cavity 2 is communicated with the check valve 5 through a distribution pipe 7, and the check valve 5 can communicate the intake pipe 1 with the pre-chamber 8; an air flow passage 12 for communicating the check valve 5 with the spark plug 4 is provided inside the bushing assembly 32, so that the mixed gas in the intake pipe 1 can flow through the check valve 5 and the air flow passage 12 to scavenge the spark plug 4.

[0053] It should be noted that: the cylinder is an important part of the engine. The cylinder has four strokes, which are the intake stroke, the compression stroke, the power stroke and the exhaust stroke in sequence. In the intake stroke, the piston moves downward and the intake valve opens; in the compression stroke, the piston moves upward and the intake valve closes, and the gas in the main combustion chamber is compressed; in the power stroke, the piston reaches the top dead center, the spark plug 4 ignites, the gas expands, forcing the piston to move downward; in the exhaust stroke, the piston reaches the bottom dead center, the exhaust valve opens, and the piston moves upward to discharge the burned gas out of the exhaust valve; during the intake stroke, under the dual action of the pressure difference force between the intake pipe 1 and the pre-chamber 8 and the gravity of the valve core of the check valve 5, the valve core moves downward, and the combustible mixed gas in the intake pipe 1 enters the distribution cavity 2 through the gas extraction pipe 6. The combustible mixed gas passing through the distribution cavity 2 passes through the distribution pipe 7 and then through the check valve 5 into the pre-chamber 8. The pre-chamber 8 can be arranged opposite to the main combustion chamber. The combustible mixed gas in the pre-chamber 8 is ignited under the action of the spark plug 4, and the ignited combustible mixed gas enters the main combustion chamber to ignite the combustible mixed gas in the main combustion chamber.

[0054] The intake pipe 1 of a pre-chamber device of the present application, as a structural member capable of providing combustible mixture for the main combustion chamber and the pre-chamber 8, is connected to the gas extraction pipe 6, the gas extraction pipe 6 is communicated with the distribution cavity 2, and the distribution cavity 2 is communicated with the check valve 5 through the distribution pipe 7, so that the combustible mixture in the intake pipe 1 can flow through the gas extraction pipe 6, the distribution cavity 2, the distribution pipe 7 and the check valve 5 to the pre-chamber 8 in sequence. Through the above settings, not only can the pressure difference between the intake pipe 1 and the cylinder be utilized to take an equivalent amount of mixture from the intake pipe 1 as the scavenging working medium to provide an appropriate amount of combustible mixed gas in the pre-chamber 8, but also directional scavenging of the spark plug 4 can be achieved;

[0055] In addition, an air flow channel for communicating the one-way valve 5 with the spark plug 4 is formed inside the bushing assembly 32, so that the mixed gas in the intake pipe 1 can flow through the one-way valve 5 and the air flow channel to scavenge the spark plug 4, thereby avoiding incomplete scavenging near the spark plug 4 caused by the traditional scavenging structure. Therefore, the situation of poor scavenging effect on the root part of the spark plug 4 can be avoided, direct scavenging of the spark plug 4 can be achieved, the scavenging effect on the root part of the spark plug 4 can be improved, the influence on the initial ignition and jet process inside the pre-chamber 8 can be reduced, the combustion stability of the engine can be improved, and the work capacity of the engine can be enhanced.

[0056] As a preferred embodiment, the spark plug 4 is connected to the inside of the bushing assembly 32 through a spark plug liner, and one end of the spark plug 4 can extend into the lower pre-chamber 8; an air flow channel 12 is formed in the spark plug liner, and a scavenging hole 9 is formed on the side of the one-way valve 5 facing the spark plug 4. The scavenging hole 9 is communicated with the air flow channel 12 to form a scavenging channel for purging the spark plug 4.

[0057] The spark plug 4 is fixedly connected to the inside of the bushing assembly 32 through the spark plug liner. The first function of the spark plug liner is to connect and fix the spark plug 4 to achieve stable ignition; the second function is to be able to form an air flow channel 12, so that the air flow channel 12 is communicated with the scavenging hole 9 of the one-way valve 5 to form a scavenging channel. Thus, after the one-way valve 5 is opened, the combustible mixture in the distribution pipe 7 can flow through the one-way valve 5 into the pre-chamber 8, and a part of the combustible mixture can also flow through the scavenging hole 9 of the one-way valve 5 and the air flow channel 12 communicated with the scavenging hole 9 to the spark plug 4. The air flow flows along the spark plug 4 into the pre-chamber 8 below the spark plug 4, realizing direct scavenging of the spark plug 4, achieving sufficient scavenging of the root part of the spark plug 4, helping to thoroughly remove the remaining exhaust gas near the spark plug 4, improving the ignition performance, and improving the combustion stability.

[0058] The structure of the spark plug 4 can be not limited by this application and can adopt the following two embodiments, specifically as follows:

[0059] Embodiment 1: As Figure 5 shown, the spark plug 4 is provided with a convection hole 10 arranged opposite to the scavenging hole 9, and the mixed gas is output to the electrode position of the spark plug 4 through the scavenging channel and the convection hole 10.

[0060] In order to further enhance the scavenging of the combustible mixture near the spark plug 4 and reduce the residual amount of exhaust gas near the spark plug 4, a convection hole 10 opposite to the scavenging hole 9 can also be provided at one end of the spark plug 4. The convection hole 10 enables the mixture gas to be discharged through the scavenging channel and then concentratedly discharged to the spark plug 4 through the convection hole 10, improving the direct purging of the combustible mixture gas to the spark plug 4, further realizing the scavenging near the spark plug 4, including purging the electrode position, reducing the residual amount of exhaust gas, and improving the ignition performance and combustion stability. Moreover, it is also applicable to spark plugs 4 of other structural forms, such as multi-electrode spark plugs. The convection hole 10 is a hole provided at the end of the spark plug 4 and communicating with the inside of the spark plug 4, enabling the combustible mixture gas to further enter near the spark plug and realizing sufficient scavenging near the spark plug 4. The convection hole 10 is a hole provided at the end of the spark plug 4 and communicating with the inside of the spark plug 4, enabling the combustible mixture gas to further enter near the spark plug 4 and realizing sufficient scavenging near the spark plug.

[0061] Embodiment 2: As Figure 6 shown, the spark plug 4 is provided with a convection groove 11 opposite to the scavenging hole 9, and the mixture gas is output to the electrode position of the spark plug 4 through the scavenging channel and the convection groove 11.

[0062] The ignition gap refers to the distance between the electrodes of the spark plug 4 in the engine ignition system. In order to further improve the scavenging efficiency and achieve thorough cleaning of the exhaust gas near the spark plug 4, the convection groove 11 can be set to enable the air flow to flow along the groove to correspond to the ignition gap of the spark plug 4, so that the combustible mixture gas output from the scavenging channel can directly blow towards the ignition gap through the convection hole 10, and sufficiently purge the area near the spark plug 4 including the electrode position; the convection groove 11 is a groove provided on the circumferential side of the end of the spark plug 4 and not communicating with the inside, enabling the combustible mixture gas to further enter near the spark plug 4 and realizing sufficient scavenging near the spark plug.

[0063] As a preferred embodiment, the height of the one-way valve 5 along the axial direction of the bushing assembly 32 is higher than the height of the spark plug 4 along the axial direction of the bushing assembly 32 by a preset distance, so that the air flow flowing out of the one-way valve 5 can impact the electrode position of the spark plug 4.

[0064] In addition to providing an air flow channel 12 between the one-way valve 5 and the spark plug 4, there is also a second embodiment, as Figure 7 shown, that is, the position of the one-way valve 5 is adjusted upward by a preset distance along the axial direction of the bushing assembly 32, so that the gas flowing out of the one-way valve 5 can impact the electrode position of the spark plug 4, and can also further effectively scavenge the area near the spark plug 4, improve the ignition performance of the spark plug 4, and further improve the combustion stability of the entire pre-chamber device.

[0065] Furthermore, the extension line of the tangent direction of the gas flow output by the one-way valve 5 can intersect with the ignition gap of the spark plug 4.

[0066] The position where the one-way valve 5 is arranged is configured such that the extension line of the tangent direction of the air flow output by the one-way valve 5 intersects with the ignition gap of the spark plug 4, so that the combustible mixture flowing through the one-way output can flow through the root part of the spark plug 4 and near the spark plug 4 under the operation of the air flow, realizing a sufficient scavenging process for the spark plug 4. As Figure 7 shown, in the direction of the gas flow output by the one-way valve 5, a part of the air flow flows through the one-way valve 5 to the pre-chamber 8, and a part of the air flow can flow through the root part of the spark plug 4 during the process of rushing towards the pre-chamber 8, so as to directly scavenge the spark plug 4, increase the residual amount of exhaust gas near the spark plug 4, and improve the ignition performance and combustion stability performance.

[0067] In addition, the bushing assembly 32 includes a spark plug bushing 321 and an ignition coil bushing 322 connected to each other; a spark plug 4 and a one-way valve 5 are arranged in the spark plug bushing 321, and the distribution pipe 7 can sequentially extend into the ignition coil bushing 322, the spark plug bushing 321 and be connected to the one-way valve 5; an ignition coil 13 connected to the spark plug 4 is arranged in the ignition coil bushing 322.

[0068] As Figure 3 shown, the bushing assembly 32 includes a spark plug bushing 321 connected above the pre-chamber main body 31 and an ignition coil bushing 322 connected above the spark plug bushing 321. The ignition coil bushing 322 is connected above the spark plug bushing 321 through a connecting member, and the two are hermetically connected. The spark plug liner is connected in the spark plug bushing 321. One end of the spark plug 4 is inserted into the spark plug liner, and this end can extend out of the spark plug liner part and enter the pre-chamber 8 to ignite the combustible mixture in the pre-chamber 8. The spark plug 4 is fixedly connected in the spark plug bushing 321 through the spark plug liner, and can block a part of the area above the pre-chamber 8, while the other part of the area above the pre-chamber 8 is opened and closed through a one-way valve 5 connected in the spark plug bushing 321 and located on one side of the spark plug liner. The purpose is to connect or close the intake pipe 1 and the pre-chamber 8 through the setting of the one-way valve 5. During use, the valve core of the one-way valve 5 can move under the pressure difference between the intake pipe 1 and the pre-chamber 8 and the self-gravity of the valve core during the engine intake stroke to open the one-way valve 5, and the combustible mixture passes through the intake pipe 1, the intake pipe 6, the distribution cavity 2, the distribution pipe 7 and enters the one-way valve 5, and then enters the pre-chamber 8 through the one-way valve 5; the valve core of the one-way valve 5 can move to close the one-way valve 5 during the compression stroke due to the pressure difference force between the pre-chamber 8 and the intake pipe 1 overcoming the self-gravity of the valve core.

[0069] In addition, the distribution cavity 2 has a plurality of outlet ports, and each outlet port can be respectively connected with a corresponding distribution pipe 7. The mixed gas in the intake pipe 1 flows to different pre-chambers 8 through the distribution pipe 7.

[0070] There are multiple cylinders in the engine, and a spark plug can be arranged in each cylinder. Therefore, in order to enhance the scavenging effect of multiple spark plugs 4, a distribution cavity 2 is provided to temporarily store the combustible mixed gas output from the intake pipe 1 to the gas extraction pipe 6, and distribute the gas into the pre-chambers 8 acted on by each spark plug 4, so as to achieve scavenging of multiple spark plugs 4, thereby improving the scavenging ability of the entire engine and the working performance of the engine.

[0071] In addition, an air extraction port for communicating with the gas extraction pipe 6 is provided on the downstream side of the intake pipe 1.

[0072] The purpose of providing the air extraction port on the downstream side of the intake pipe 1 is that the gas entering the gas extraction pipe 6 is a mixed gas of fuel gas and air. Since the air extraction port is located downstream of the intake pipe 1, that is, downstream of the fuel gas inlet, the fuel gas and air are mixed in an equivalent ratio before entering the air extraction port. In this way, the equivalent mixture can enter the gas extraction pipe 6 through the air extraction port.

[0073] This application also relates to an engine, which includes a turbocharger, a cylinder, and the above-mentioned pre-chamber device connected in the cylinder. The turbocharger includes a compressor and a turbine. The compressor is connected to the intake pipe 1 to supply air to the intake pipe 1, and the turbine is connected to the exhaust pipe of the cylinder for exhaust gas discharge.

[0074] The cylinder includes a cylinder block, a cylinder head, a piston, and a pre-chamber device. The cylinder head is located at the top of the cylinder block. The piston is arranged in the cylinder block and forms a main combustion chamber between the piston and the cylinder head. The piston is located below the pre-chamber device. The main combustion chamber and the pre-chamber are arranged opposite to each other. The spark plug bushing 321 of the pre-chamber device is provided with spray holes, and the spray holes communicate the main combustion chamber with the pre-chamber 8; when the spark plug 4 can ignite the combustible mixture in the pre-chamber 8, the combustible mixture in the pre-chamber 8 flows into the main combustion chamber through the spray holes, and further ignites the combustible mixture in the main combustion chamber.

[0075] What is not described in this utility model can be realized by adopting or referring to the existing technology.

[0076] Each embodiment in this specification is described in a progressive manner. For the same or similar parts between each embodiment, reference can be made to each other. The key points of each embodiment are to illustrate the differences from other embodiments.

[0077] The above are only embodiments of the present utility model and are not intended to limit the present utility model. For those skilled in the art, various modifications and variations can be made to the present utility model. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present utility model shall be included within the scope of the claims of the present utility model.

Claims

1. A pre-combustion chamber device, characterized in that: include: An intake pipe (1), a distribution chamber (2) and a pre-combustion chamber assembly (3); the pre-combustion chamber assembly (3) comprises a pre-combustion chamber body (31) and a bushing assembly (32) connected to each other, the inner cavity of the pre-combustion chamber body (31) forms a pre-combustion chamber (8), and the bushing assembly (32) is connected with a spark plug (4) and a one-way valve (5) which are isolated from each other; the intake pipe (1) is connected to the distribution chamber (2) through an air intake pipe (6), and the distribution chamber (2) is connected to the one-way valve (5) through a distribution pipe (7), and the one-way valve (5) can connect the intake pipe (1) and the pre-combustion chamber (8); an air flow channel (12) is provided in the bushing assembly (32) to connect the one-way valve (5) and the spark plug (4), so that the mixed gas in the intake pipe (1) flows through the one-way valve (5) through the air flow channel (12) to scavenge the spark plug (4) 2. A pre-combustion chamber device according to claim 1, characterized in that: The spark plug (4) is connected to the bushing assembly (32) via a spark plug liner, and one end of the spark plug (4) can extend into the pre-combustion chamber (8) below; the spark plug liner is provided with the air flow channel (12), and the one-way valve (5) is provided with a scavenging hole (9) on the side facing the spark plug (4); the scavenging hole (9) is connected to the air flow channel (12) to form a scavenging channel for purging the spark plug (4).

3. A pre-combustion chamber device according to claim 2, characterized in that: The spark plug (4) is provided with a convection hole (10) arranged opposite to the scavenging hole (9), and the mixed gas is output to the electrode position of the spark plug (4) through the scavenging channel and the convection hole (10).

4. A pre-combustion chamber device according to claim 2, characterized in that: The spark plug (4) is provided with a convection groove (11) arranged opposite to the scavenging hole (9), and the mixed gas is output to the electrode position of the spark plug (4) through the scavenging channel and the convection groove (11).

5. A pre-combustion chamber device according to claim 1, characterized in that: The height of the bottom of the one-way valve (5) along the axial direction of the bushing assembly (32) is higher than the height of the bottom of the spark plug (4) along the axial direction of the bushing assembly (32) by a preset distance, so that the airflow flowing out of the one-way valve (5) can impact the electrode position of the spark plug (4).

6. A pre-combustion chamber device according to claim 5, characterized in that: An extension line of the tangential direction of the gas flow output by the one-way valve (5) can intersect with the ignition gap of the spark plug (4).

7. A pre-combustion chamber device according to claim 1, characterized in that: The bushing assembly (32) comprises a spark plug bushing (321) and an ignition coil bushing (322) connected to each other; a spark plug (4) and a one-way valve (5) are arranged in the spark plug bushing (321); a distribution pipe (7) can be sequentially extended into the ignition coil bushing (322) and the spark plug bushing (321) to be connected to the one-way valve (5); an ignition coil (13) connected to the spark plug (4) is arranged in the ignition coil bushing (322).

8. A pre-combustion chamber device according to claim 7, characterized in that: The distribution chamber (2) has a plurality of output ports, each of which can be connected to a corresponding distribution pipe (7), through which the mixed gas in the intake pipe (1) flows to different pre-combustion chambers (8).

9. A pre-combustion chamber device according to claim 1, characterized in that: An air intake port for communicating with the air intake pipe (6) is provided on the downstream side of the air intake pipe (1).

10. An engine, characterized in that: include: A turbocharger, a cylinder and a pre-combustion chamber device as described in any one of claims 1 to 9 connected to the cylinder, wherein the turbocharger comprises a compressor and a turbine, the compressor being connected to the intake pipe (1) for providing air to the intake pipe (1), and the turbine being connected to the exhaust pipe of the cylinder for exhausting exhaust gas.

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