Pre-combustion chamber structure and engine

Abstract

The utility model belongs to the technical field of engines, and discloses a pre-combustion chamber structure and an engine. The pre-combustion chamber structure comprises a pre-combustion chamber body, and the pre-combustion chamber body is provided with a pre-combustion chamber. The pre-combustion chamber body is further provided with an active scavenging channel communicating with the pre-combustion chamber and an active fuel gas channel communicating with the pre-combustion chamber. In the height direction of the pre-combustion chamber, the active fuel gas channel is located below the active scavenging channel. The pre-combustion chamber structure further comprises a control valve block, and the control valve block can selectively connect and disconnect the input end of the active scavenging channel and the scavenging gas source and can selectively connect and disconnect the input end of the active fuel gas channel and the fuel gas source. The starting time for scavenging the pre-combustion chamber and the starting time for introducing fuel gas into the pre-combustion chamber can be conveniently adjusted according to actual working condition requirements; and secondly, the scavenging effect and efficiency of the pre-combustion chamber can be effectively improved, so that the risk that fuel gas in the pre-combustion chamber leaks into a main combustion chamber of the engine is effectively reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of engines, in particular to a pre-combustion chamber structure and an engine. Background Art

[0002] Pre-combustion chamber ignition is one of the main ways to achieve engine ignition. It uses a spark plug in the pre-combustion chamber to ignite the pilot gas, and then sprays the ignited high-temperature and high-pressure pilot gas into the main combustion chamber through the channel between the pre-combustion chamber and the main combustion chamber, igniting the gas in the main combustion chamber. This can significantly shorten the combustion duration of the gas in the main combustion chamber, ignite lean gas, reduce combustion temperature, reduce NOx emissions, improve combustion efficiency, and reduce engine gas consumption, etc., so it has been widely studied and applied. Specifically, pre-combustion chamber ignition includes active ignition and passive ignition. Active ignition refers to the gas in the pre-combustion chamber being fed from the outside of the engine through an independent pipe and ignited by a spark plug; passive ignition refers to the gas in the pre-combustion chamber being pressed into the main combustion chamber by a piston and ignited by a spark plug.

[0003] For active ignition, the existing technology usually only provides one set of gas channels to purge the pre-combustion chamber or introduce gas into the pre-combustion chamber. Although active ignition can be achieved, it is not convenient to adjust the starting time of scavenging the pre-combustion chamber and the starting time of introducing gas into the pre-combustion chamber according to actual working conditions, and the scavenging effect of scavenging the pre-combustion chamber needs to be improved. Utility Model Content

[0004] The purpose of the present utility model is to provide a pre-combustion chamber structure and an engine to solve the above-mentioned problems existing in the pre-combustion chamber structure in the prior art.

[0005] To achieve this purpose, the present invention adopts the following technical solutions:

[0006] A pre-combustion chamber structure includes a pre-combustion chamber body, wherein the pre-combustion chamber body is provided with a pre-combustion chamber; the pre-combustion chamber body is further provided with an active scavenging passage communicating with the pre-combustion chamber and an active fuel gas passage communicating with the pre-combustion chamber; along the height direction of the pre-combustion chamber, the active fuel gas passage is located below the active scavenging passage;

[0007] The pre-combustion chamber structure further includes a control valve block, which can selectively connect and disconnect the input end of the active scavenging channel and the scavenging gas source, and can selectively connect and disconnect the input end of the active fuel gas channel and the fuel gas source.

[0008] As a preferred embodiment of the above-mentioned pre-combustion chamber structure, the active scavenging channel includes a sub-scavenging channel group, which includes a plurality of sub-scavenging channels spaced apart along the circumference of the pre-combustion chamber; one end of each of the sub-scavenging channels is connected to an output end of the control valve block, and the other end of each of the sub-scavenging channels is connected to the pre-combustion chamber;

[0009] An angle between a direction in which gas flows from the sub-scavenging channel to the pre-combustion chamber and a direction from top to bottom of the pre-combustion chamber is a first angle, and the first angle is greater than 90° and less than 180°.

[0010] As a preferred solution of the above-mentioned pre-combustion chamber structure, there are multiple sub-scavenging channel groups, and the multiple sub-scavenging channel groups are spaced apart along the height direction of the pre-combustion chamber;

[0011] Along the direction from top to bottom of the pre-combustion chamber, the first angles corresponding to the plurality of sub-scavenging channel groups gradually increase.

[0012] As a preferred solution of the above-mentioned pre-combustion chamber structure, the sub-scavenging channel is arc-shaped; along the height direction of the pre-combustion chamber, the opening of the arc faces downward.

[0013] As a preferred solution of the above-mentioned pre-combustion chamber structure, the aperture of the sub-scavenging channel gradually decreases along the input end of the sub-scavenging channel to the output end of the sub-scavenging channel.

[0014] As a preferred embodiment of the above-mentioned pre-combustion chamber structure, the active gas channel includes a sub-gas channel group, wherein the sub-gas channel group includes a plurality of sub-gas channels spaced apart along the circumference of the pre-combustion chamber; one end of each of the sub-gas channels is connected to the other output end of the control valve block, and the other end of each of the sub-gas channels is connected to the pre-combustion chamber;

[0015] An angle between a direction in which gas flows from the sub-gas channel to the pre-combustion chamber and a direction from top to bottom of the pre-combustion chamber is a second angle, and the second angle is less than or equal to 90°.

[0016] As a preferred solution of the above-mentioned pre-combustion chamber structure, there are multiple sub-gas channel groups, and the multiple sub-gas channel groups are spaced apart along the height direction of the pre-combustion chamber;

[0017] Along the direction from top to bottom of the pre-combustion chamber, the second angles corresponding to the plurality of sub-gas channel groups gradually increase.

[0018] As a preferred embodiment of the above-mentioned pre-combustion chamber structure, the pre-combustion chamber includes a conical first sub-chamber and a cylindrical second sub-chamber; along the height direction of the pre-combustion chamber, the first sub-chamber is located above the second sub-chamber, and the small end of the first sub-chamber is connected to the second sub-chamber;

[0019] For the plurality of sub-gas channel groups located in the area where the first sub-chamber is located, an angle between a direction in which gas flows from the sub-gas channels to the pre-combustion chamber and a top-down direction of the pre-combustion chamber is less than 90°; for the plurality of sub-gas channel groups located in the area where the second sub-chamber is located, an angle between a direction in which gas flows from the sub-gas channels to the pre-combustion chamber and a top-down direction of the pre-combustion chamber is equal to 90°.

[0020] As a preferred embodiment of the above-mentioned pre-combustion chamber structure, the pre-combustion chamber structure further comprises an air intake manifold, the input end of the air intake manifold is used to communicate with the scavenging air source and the fuel gas source, and the output end of the air intake manifold is communicated with the input end of the control valve block;

[0021] The sum of the end surface areas of the output ends of the sub-gas channels is equal to the intake cross-sectional area of ​​the intake manifold perpendicular to its own extension direction.

[0022] An engine comprising the above-mentioned pre-combustion chamber structure.

[0023] Beneficial effects of the utility model:

[0024] The utility model provides a pre-combustion chamber structure and an engine. The pre-combustion chamber structure includes a pre-combustion chamber body, which is provided with a pre-combustion chamber. The pre-combustion chamber body is also provided with an active scavenging channel and an active fuel gas channel connected to the pre-combustion chamber. Along the height direction of the pre-combustion chamber, the active fuel gas channel is located below the active scavenging channel. The pre-combustion chamber structure also includes a control valve block, which can selectively connect and disconnect the input end of the active scavenging channel and the scavenging gas source, and can selectively connect and disconnect the input end of the active fuel gas channel and the fuel gas source.

[0025] When the pre-combustion chamber is scavenged, the control valve block is used to control the input end of the active scavenging channel to be connected to the scavenging gas source, and the input end of the active gas channel is disconnected from the gas source. When gas is introduced into the pre-combustion chamber, the control valve block is used to control the input end of the active scavenging channel to be disconnected from the scavenging gas source, and the input end of the active gas channel is connected to the gas source. When the pre-combustion chamber is not scavenged and gas is not introduced, the control valve block is used to control the input end of the active scavenging channel to be disconnected from the scavenging gas source, and the input end of the active gas channel is disconnected from the gas source. This arrangement makes the active scavenging of the pre-combustion chamber and the active gas injection of the pre-combustion chamber independent of each other and do not interfere with each other, making it convenient to adjust the start time of active scavenging and the start time of active gas injection. Secondly, along the height direction of the pre-combustion chamber, an active gas channel is arranged below the active scavenging channel, so that the active scavenging channel is close to the top of the pre-combustion chamber body relative to the active gas channel. Therefore, when gas is introduced into the pre-combustion chamber through the active scavenging channel, the effect and efficiency of scavenging the pre-combustion chamber can be effectively improved. In addition, when gas is introduced into the pre-combustion chamber through the active gas channel, the introduced gas can also further scavenge the pre-combustion chamber, thereby further improving the effect and efficiency of scavenging the pre-combustion chamber, so as to effectively reduce the risk of gas in the pre-combustion chamber leaking into the main combustion chamber of the engine. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 It is a structural schematic diagram of a pre-combustion chamber structure provided by a specific embodiment of the present utility model;

[0027] Figure 2 yes Figure 1 Sectional view along AA;

[0028] Figure 3 yes Figure 1 Cross-section along BB Figure 1 ;

[0029] Figure 4 yes Figure 1 Cross-section along BB Figure 2 ;

[0030] Figure 5 yes Figure 2 Cross-sectional view along CC.

[0031] In the picture:

[0032] 1. Precombustion chamber body; 11. Precombustion chamber; 111. First subchamber; 112. Second subchamber; 12. Center mounting hole; 13. Vent hole; 14. Active scavenging channel; 141. Sub-scavenging channel; 142. Annular scavenging channel; 15. Active gas channel; 151. Sub-gas channel; 152. Annular gas channel;

[0033] 2. Control valve block;

[0034] 3. Intake manifold;

[0035] 4. Intake branch pipe. DETAILED DESCRIPTION

[0036] The present invention will be further described in detail below with reference to the accompanying drawings and examples. It should be understood that the specific embodiments described herein are intended only to illustrate the present invention and are not intended to limit the present invention. It should also be noted that, for ease of description, the accompanying drawings only illustrate portions relevant to the present invention, not all of its components.

[0037] In the description of this utility model, unless otherwise specified or limited, the terms "connected," "connect," and "fixed" should be understood in a broad sense. For example, they can refer to fixed connection, detachable connection, or integration; mechanical connection or electrical connection; direct connection or indirect connection through an intermediate medium; internal communication between two components or interaction between two components. Those skilled in the art will understand the specific meanings of the above terms in this utility model based on the specific circumstances.

[0038] In the present invention, unless otherwise expressly specified or limited, a first feature being "above" or "below" a second feature may include the first and second features being in direct contact, or may include the first and second features being in contact not directly but through another feature between them. Moreover, a first feature being "above," "above," and "above" a second feature may include the first feature being directly above or obliquely above the second feature, or may simply mean that the first feature is higher in level than the second feature. A first feature being "below," "below," and "below" a second feature may include the first feature being directly below or obliquely below the second feature, or may simply mean that the first feature is lower in level than the second feature.

[0039] In the description of this embodiment, the terms "upper," "lower," "right," and other orientations or positional relationships are based on the orientations or positional relationships shown in the accompanying drawings and are intended solely for ease of description and simplified operation. They do not indicate or imply that the devices or components referred to must have a specific orientation, be constructed, or operate in a specific orientation. Therefore, they should not be construed as limitations on the present invention. Furthermore, the terms "first" and "second" are used solely for descriptive purposes and have no special meaning.

[0040] The utility model provides a pre-combustion chamber structure, such as Figure 1-4As shown, the pre-combustion chamber structure includes a pre-combustion chamber body 1, which is provided with a pre-combustion chamber 11. Gas is introduced into the pre-combustion chamber 11, and the gas in the pre-combustion chamber 11 is ignited, thereby igniting the gas in the main combustion chamber of the engine, achieving active ignition, thereby enabling the engine to operate normally and orderly.

[0041] Specifically, if Figure 2-4 As shown, the top of the pre-combustion chamber body 1 is provided with a central mounting hole 12 that communicates with the pre-combustion chamber 11. The central mounting hole 12 is used to mount a spark plug to ignite the gas in the pre-combustion chamber 11. Preferably, the central axis of the central mounting hole 12 is collinear with the central axis of the pre-combustion chamber 11.

[0042] Specifically, if Figure 1-5 As shown, the bottom of the pre-combustion chamber body 1 is provided with a vent 13 that communicates with the pre-combustion chamber 11. Vent 13 is connected to the engine's main combustion chamber. During scavenging, exhaust gas from the pre-combustion chamber 11 flows through vent 13 into the main combustion chamber and out of it. During ignition, the ignited fuel gas in the pre-combustion chamber 11 is ejected through vent 13 into the main combustion chamber, igniting the fuel gas in the main combustion chamber and achieving active ignition.

[0043] Preferably, there are multiple vent holes 13, spaced apart along the circumference of the pre-combustion chamber 11. This improves the uniformity of gas injection and enhances the efficiency and reliability of igniting the gas in the main combustion chamber. Furthermore, preferably, the multiple vent holes 13 are evenly spaced apart along the circumference of the pre-combustion chamber 11, further improving gas injection uniformity.

[0044] Among them, such as Figure 2-4 As shown, the pre-combustion chamber body 1 is further provided with an active scavenging channel 14 and an active fuel gas channel 15, both communicating with the pre-combustion chamber 11. Along the height of the pre-combustion chamber 11, the active fuel gas channel 15 is located below the active scavenging channel 14. The pre-combustion chamber structure also includes a control valve block 2, which selectively connects and disconnects the input of the active scavenging channel 14 from the scavenging gas source, and selectively connects and disconnects the input of the active fuel gas channel 15 from the fuel gas source.

[0045] When the pre-combustion chamber 11 is scavenged, the control valve block 2 controls the input end of the active scavenging channel 14 to be connected to the scavenging gas source, and the input end of the active gas channel 15 to be disconnected from the gas source. When gas is introduced into the pre-combustion chamber 11, the control valve block 2 controls the input end of the active scavenging channel 14 to be disconnected from the scavenging gas source, and the input end of the active gas channel 15 to be connected to the gas source. When the pre-combustion chamber 11 is not scavenged and gas is not introduced, the control valve block 2 controls the input end of the active scavenging channel 14 to be disconnected from the scavenging gas source, and the input end of the active gas channel 15 to be disconnected from the gas source. This arrangement makes the active scavenging of the pre-combustion chamber 11 and the active gas injection of the pre-combustion chamber 11 independent of each other and do not interfere with each other, making it convenient to adjust the start time of the active scavenging and the start time of the active gas injection. Secondly, along the height direction of the pre-combustion chamber 11, an active gas channel 15 is arranged below the active scavenging channel 14, so that the active scavenging channel 14 is close to the top of the pre-combustion chamber body 1 relative to the active gas channel 15, so that when gas is introduced into the pre-combustion chamber 11 through the active scavenging channel 14, the effect and efficiency of scavenging the pre-combustion chamber 11 can be effectively improved. In addition, when gas is introduced into the pre-combustion chamber 11 through the active gas channel 15, the introduced gas can also further purge the pre-combustion chamber 11, thereby further improving the effect and efficiency of scavenging the pre-combustion chamber 11, so as to effectively reduce the risk of gas in the pre-combustion chamber 11 leaking into the main combustion chamber of the engine.

[0046] Specifically, in this embodiment, the control valve block 2 includes two switch valves. The two switch valves include a first switch valve and a second switch valve. The input end of the first switch valve is connected to the scavenging air source, and the output end of the first switch valve is connected to the input end of the active scavenging channel 14 through one of its intake branches 4. The input end of the second switch valve is connected to the fuel gas source, and the output end of the second switch valve is connected to the input end of the active fuel gas channel 15 through another intake branch 4. As an alternative, the control valve block 2 can also be an electromagnetic reversing valve. It can selectively switch on and off the input end of the active scavenging channel 14 and the scavenging air source, and can selectively switch on and off the input end of the active fuel gas channel 15 and the fuel gas source. Exemplarily, the electromagnetic reversing valve is a three-position four-way electromagnetic reversing valve.

[0047] Specifically, if Figure 2-4As shown, the active scavenging channel 14 includes a sub-scavenging channel group, and the sub-scavenging channel group includes a plurality of sub-scavenging channels 141 distributed at intervals along the circumference of the pre-combustion chamber 11. The angle between the direction in which the gas flows from the sub-scavenging channel 141 to the pre-combustion chamber 11 and the direction from top to bottom of the pre-combustion chamber 11 is a first angle, and the first angle is greater than 90° and less than 180°. This arrangement allows the gas injected into the pre-combustion chamber 11 from each sub-scavenging channel 141 along the height direction of the pre-combustion chamber 11 to be inclined downward, which helps to discharge the exhaust gas generated in the previous cycle in the pre-combustion chamber 11, so as to effectively improve the scavenging effect of the pre-combustion chamber 11, thereby effectively reducing the risk of gas in the pre-combustion chamber 11 leaking into the main combustion chamber and improving the working performance of the pre-combustion chamber structure.

[0048] Preferably, if Figure 2-4 As shown, there are multiple sub-scavenging channel groups, and the multiple sub-scavenging channel groups are spaced apart along the height direction of the pre-combustion chamber 11. The first angles corresponding to the multiple sub-scavenging channel groups gradually increase from top to bottom in the pre-combustion chamber 11. The multiple sub-scavenging channel groups are spaced apart along the height direction of the pre-combustion chamber 11, so that the active scavenging channel 14 has a large coverage area, which can further improve the scavenging effect and efficiency of scavenging the pre-combustion chamber 11, thereby further reducing the risk of gas leakage from the pre-combustion chamber 11 into the main combustion chamber and further improving the performance of the pre-combustion chamber structure. Secondly, the first angles corresponding to the multiple sub-scavenging channel groups are gradually increased from top to bottom in the pre-combustion chamber 11, so that the gas injected into the central area of ​​the pre-combustion chamber 11 by the sub-scavenging channel groups is distributed sequentially from top to bottom in the height direction of the pre-combustion chamber 11, thereby further improving the scavenging effect and efficiency of scavenging the pre-combustion chamber 11. The central area of ​​the pre-combustion chamber 11 refers to the area where the central axis of the pre-combustion chamber 11 is located. It can be understood that the direction from top to bottom of the pre-combustion chamber 11, the direction from bottom to top of the pre-combustion chamber 11, the height direction of the pre-combustion chamber 11 and the central axis of the pre-combustion chamber 11 are all parallel.

[0049] Preferably, if Figure 2-4 As shown, multiple sub-scavenging channel groups are evenly spaced apart along the height direction of the pre-combustion chamber 11. The multiple sub-scavenging channels 141 of each sub-scavenging channel group are evenly spaced apart along the circumference of the pre-combustion chamber 11. In this embodiment, two sub-scavenging channel groups are provided as an example, and each sub-scavenging channel group includes five sub-scavenging channels 141 evenly spaced apart along the circumference of the pre-combustion chamber 11.

[0050] Preferably, if Figure 2-4As shown, in two adjacent sub-scavenging channel groups along the height direction of the pre-combustion chamber 11, the multiple sub-scavenging channels 141 in one sub-scavenging channel group and the multiple sub-scavenging channels 141 in the other sub-scavenging channel group are staggered in their circumferential arrangement positions along the pre-combustion chamber 11. This can further increase the scavenging range of the active scavenging channel 14, thereby further improving the scavenging effect and scavenging efficiency of the pre-combustion chamber 11. As an alternative, in two adjacent sub-scavenging channel groups along the height direction of the pre-combustion chamber 11, the multiple sub-scavenging channels 141 in one sub-scavenging channel group correspond one-to-one with the multiple sub-scavenging channels 141 in the other sub-scavenging channel group and are arranged in the same circumferential arrangement positions along the pre-combustion chamber 11.

[0051] Preferably, if Figure 2-4 As shown, the sub-scavenging channel 141 is arc-shaped; along the height direction of the pre-combustion chamber 11, the arc-shaped opening faces downward. In this way, along the height direction of the pre-combustion chamber 11, the gas injected into the pre-combustion chamber 11 by each sub-scavenging channel 141 is inclined downward, so as to help discharge the exhaust gas generated in the previous cycle in the pre-combustion chamber 11. As an alternative, the sub-scavenging channel 141 can also be set to be straight, and the angle between the direction of the gas flowing from the straight sub-scavenging channel 141 into the pre-combustion chamber 11 and the direction of the pre-combustion chamber 11 from top to bottom is greater than or equal to 90° and less than 180°. Along the height direction of the pre-combustion chamber 11, the gas injected into the pre-combustion chamber 11 by each sub-scavenging channel 141 can also be inclined downward, so as to help discharge the exhaust gas generated in the previous cycle in the pre-combustion chamber 11.

[0052] Preferably, the aperture of the sub-scavenging channel 141 gradually decreases from the input end to the output end of the sub-scavenging channel 141. It is understandable that the cross-sectional area of ​​the sub-scavenging channel 141 perpendicular to its own extension direction gradually decreases from the input end to the output end of the sub-scavenging channel 141. This effectively increases the speed at which gas is injected into the pre-combustion chamber 11 from the sub-scavenging channel 141, thereby further improving the scavenging effect and efficiency of scavenging the pre-combustion chamber 11. As an alternative, the aperture of each portion of the sub-scavenging channel 141 is equal from the input end to the output end of the sub-scavenging channel 141.

[0053] Specifically, if Figure 2-4 As shown, the active scavenging channel 14 further includes an annular scavenging channel 142 located within the pre-combustion chamber body 1. The annular scavenging channel 142 is connected to each sub-scavenging channel 141 of each sub-scavenging channel group and is also connected to one output end of the control valve block 2. This ensures that one end of each sub-scavenging channel 141 is connected and can selectively connect to a scavenging gas source.

[0054] Specifically, in this embodiment, the gas supplied by the scavenging gas source is fuel gas, which is methane. The fuel gas supplied by the fuel gas source is also methane. As an alternative, the gas supplied by the scavenging gas source is air. In other embodiments, the fuel gas can also be replaced with hydrogen or other hydrocarbons.

[0055] Specifically, if Figure 2-4 As shown, the active scavenging channel 14 includes a sub-gas channel group, which includes multiple sub-gas channels 151 spaced apart along the circumference of the pre-combustion chamber 11. One end of each sub-gas channel 151 is connected to the other output end of the control valve block 2, and the other end of each sub-gas channel 151 is connected to the pre-combustion chamber 11. The angle between the direction of gas flow from the sub-gas channel 151 to the pre-combustion chamber 11 and the direction from top to bottom of the pre-combustion chamber 11 is a second angle, which is less than or equal to 90°. The angle between the direction in which the gas flows from the sub-gas channel 151 to the pre-combustion chamber 11 and the direction from top to bottom of the pre-combustion chamber 11 is a second angle. When the second angle is less than 90°, the gas injected into the pre-combustion chamber 11 from each sub-scavenging channel 141 along the height direction of the pre-combustion chamber 11 is inclined upward, so that the gas can accumulate upward along the height direction of the pre-combustion chamber 11 near the spark plug, thereby making the gas around the spark plug as concentrated as possible, and the exhaust gas generated in the previous cycle in the pre-combustion chamber 11 can be further discharged by using the inclined upward injection of the gas, which is beneficial to improving the ignition efficiency and ignition reliability of the gas in the pre-combustion chamber 11; when the angle between the direction in which the gas flows from the sub-gas channel 151 to the pre-combustion chamber 11 and the direction from top to bottom of the pre-combustion chamber 11 is equal to 90°, the gas injected in the horizontal direction can make the gas in the pre-combustion chamber 11 mixed more evenly, which is beneficial to the ignition of the gas in the current cycle.

[0056] Preferably, if Figure 2-4 As shown, there are multiple sub-gas channel groups, and the multiple sub-gas channel groups are spaced apart along the height direction of the pre-combustion chamber 11. From top to bottom along the pre-combustion chamber 11, the second angles corresponding to the multiple sub-gas channel groups gradually increase. The number of sub-gas channel groups is set to be multiple, and the multiple sub-gas channel groups are spaced apart along the height direction of the pre-combustion chamber 11, so that the coverage area of ​​the active gas channel 15 is large, thereby further improving the mixing uniformity of the gas in the pre-combustion chamber 11; secondly, the second angles corresponding to the multiple sub-gas channel groups are set to gradually increase along the top-down direction of the pre-combustion chamber 11, so that the gas injected into the central area of ​​the pre-combustion chamber by the sub-gas channel groups is distributed in sequence from top to bottom along the height direction of the pre-combustion chamber, thereby further improving the mixing uniformity of the gas in the pre-combustion chamber 11.

[0057] Preferably, if Figure 2-4As shown, the plurality of sub-gas channel groups are evenly spaced apart along the height direction of the pre-combustion chamber 11. The sub-gas channels 151 in each sub-gas channel group are evenly spaced apart along the circumference direction of the pre-combustion chamber 11.

[0058] Preferably, the sub-gas channel 151 is linear, and the angle between the direction of gas flow from the linear sub-gas channel 151 to the pre-combustion chamber 11 and the direction from top to bottom of the pre-combustion chamber 11 is less than or equal to 90 degrees. This allows the gas to quickly and efficiently accumulate in the top center area of ​​the pre-combustion chamber 11, further improving the ignition efficiency and reliability of the gas in the pre-combustion chamber 11.

[0059] Specifically, if Figure 2-4 As shown, the active gas channel 15 also includes an annular gas channel 152 located within the pre-combustion chamber body 1. The annular gas channel 152 is connected to each sub-gas channel 151 of each sub-gas channel group and is also connected to the other output end of the control valve block 2. This ensures that one end of each sub-gas channel 151 is connected and can selectively connect to the gas source.

[0060] Preferably, if Figure 2-4 As shown, the pre-combustion chamber 11 includes a conical first sub-chamber 111 and a cylindrical second sub-chamber 112. Along the height of the pre-combustion chamber 11, the first sub-chamber 111 is located above the second sub-chamber 112, and the small end of the first sub-chamber 111 is connected to the second sub-chamber 112. For the several sub-gas channel groups located in the area where the first sub-chamber 111 is located, the angle between the direction of gas flowing from the sub-gas channel 151 to the pre-combustion chamber 11 and the direction from top to bottom of the pre-combustion chamber 11 is less than 90°. For the several sub-gas channel groups located in the area where the second sub-chamber 112 is located, the angle between the direction of gas flowing from the sub-gas channel 151 to the pre-combustion chamber 11 and the direction from top to bottom of the pre-combustion chamber 11 is equal to 90°. With this arrangement, the multiple sub-gas channel groups located in the area of ​​the first sub-chamber 111 can cause the gas to accumulate upward along the height direction of the pre-combustion chamber 11 near the spark plug, thereby making the gas around the spark plug as concentrated as possible. The multiple sub-gas channel groups located in the area of ​​the second sub-chamber 112 can mix the gas in the pre-combustion chamber 11 more evenly, which is conducive to the ignition of the gas in the current cycle. This can effectively improve the ignition efficiency of the gas in the pre-combustion chamber 11 and effectively enhance the mixing uniformity of the gas in the pre-combustion chamber 11.

[0061] Specifically, in this embodiment, Figure 2-4As shown, along the height direction of the pre-combustion chamber 11, the central mounting hole 12 and the multiple sub-scavenging channels 141 of the active scavenging channel 14 are all located at the top of the first sub-chamber 111 and are all connected to the first sub-chamber 111. The vent hole 13 is located at the bottom of the second sub-chamber 112 and is connected to the second sub-chamber 112.

[0062] In this embodiment, if Figure 2-4 As shown, five sub-gas channel groups are exemplarily provided, and the five sub-gas channel groups are evenly spaced along the height direction of the pre-combustion chamber 11. Two of the sub-gas channel groups are located in the area where the first sub-chamber 111 is located, and the remaining three sub-gas channel groups are located in the area where the second sub-chamber 112 is located. Specifically, for the two sub-gas channel groups located in the area where the first sub-chamber 111 is located, the angle between the direction of gas flowing from the sub-gas channel 151 to the pre-combustion chamber 11 and the top-down direction of the pre-combustion chamber 11 is less than 90°; and along the top-down direction of the pre-combustion chamber 11, the corresponding angles of the two sub-gas channel groups gradually increase. For the three sub-gas channel groups located in the area where the second sub-chamber 112 is located, the angle between the direction of gas flowing from the sub-gas channel 151 to the pre-combustion chamber 11 and the top-down direction of the pre-combustion chamber 11 is all equal to 90°.

[0063] In this embodiment, each sub-gas channel group exemplarily includes five sub-gas channels 151 , and the five sub-gas channels 151 of each sub-gas channel group are evenly spaced along the circumference of the pre-combustion chamber 11 .

[0064] Specifically, if Figure 1-4 As shown, the pre-combustion chamber structure further includes an air intake manifold 3 , the input end of the air intake manifold 3 is used to communicate with the scavenging air source and the fuel gas source, and the output end of the air intake manifold 3 is communicated with the input end of the control valve block 2 .

[0065] In this embodiment, the scavenging gas source and the fuel gas source are the same gas supply source. The input end of the intake manifold 3 is connected to the gas supply source. As an alternative, the intake manifold 3 has two inlets, one of which is connected to the scavenging gas source and the other to the fuel gas source.

[0066] Preferably, the sum of the end surface areas of the output ends of the sub-scavenging channels 141 is equal to the intake cross-sectional area of ​​the intake manifold 3 perpendicular to its own extending direction, so as to avoid pressure loss caused by conveying gas.

[0067] Preferably, the sum of the end surface areas of the output ends of the sub-gas channels 151 is equal to the intake cross-sectional area of ​​the intake manifold 3 perpendicular to its own extension direction, so as to avoid pressure loss caused by transporting gas.

[0068] The present invention also provides an engine comprising the above-mentioned pre-combustion chamber structure. By adopting the above-mentioned pre-combustion chamber structure, the ignition efficiency and ignition reliability of the engine can be effectively improved.

[0069] Obviously, the above-described embodiments of the present invention are merely examples for the purpose of clearly illustrating the present invention and are not intended to limit the manner in which the present invention is to be implemented. A person skilled in the art would be able to make various obvious changes, readjustments, and substitutions without departing from the scope of protection of the present invention. It is not necessary and impossible to enumerate all embodiments here. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention shall be included within the scope of protection of the claims of the present invention.

Claims

1. A pre-combustion chamber structure, comprising a pre-combustion chamber body (1), wherein the pre-combustion chamber body (1) is provided with a pre-combustion chamber (11); characterized in that: The pre-combustion chamber body (1) is further provided with an active scavenging passage (14) communicating with the pre-combustion chamber (11) and an active fuel gas passage (15) communicating with the pre-combustion chamber (11); along the height direction of the pre-combustion chamber (11), the active fuel gas passage (15) is located below the active scavenging passage (14); The pre-combustion chamber structure further comprises a control valve block (2), which can selectively connect and disconnect the input end of the active scavenging channel (14) and the scavenging gas source, and can selectively connect and disconnect the input end of the active fuel gas channel (15) and the fuel gas source.

2. The pre-combustion chamber structure according to claim 1, characterized in that: The active scavenging channel (14) includes a sub-scavenging channel group, the sub-scavenging channel group includes a plurality of sub-scavenging channels (141) distributed at intervals along the circumference of the pre-combustion chamber (11); one end of each of the sub-scavenging channels (141) is communicated with an output end of the control valve block (2), and the other end of each of the sub-scavenging channels (141) is communicated with the pre-combustion chamber (11); An angle between a direction in which gas flows from the sub-scavenging channel (141) to the pre-combustion chamber (11) and a direction from top to bottom of the pre-combustion chamber (11) is a first angle, and the first angle is greater than 90° and less than 180°.

3. The pre-combustion chamber structure according to claim 2, characterized in that: There are multiple sub-scavenging channel groups, and the multiple sub-scavenging channel groups are spaced apart and distributed along the height direction of the pre-combustion chamber (11); Along the pre-combustion chamber (11) from top to bottom, the first angles corresponding to the plurality of sub-scavenging channel groups gradually increase.

4. The pre-combustion chamber structure according to claim 2, characterized in that: The sub-scavenging channel (141) is arc-shaped; along the height direction of the pre-combustion chamber (11), the opening of the arc faces downward.

5. The pre-combustion chamber structure according to claim 2, characterized in that: The aperture of the sub-scavenging channel (141) gradually decreases from the input end of the sub-scavenging channel (141) to the output end of the sub-scavenging channel (141).

6. The pre-combustion chamber structure according to any one of claims 1 to 5, characterized in that: The active gas channel (15) comprises a sub-gas channel group, wherein the sub-gas channel group comprises a plurality of sub-gas channels (151) spaced apart along the circumference of the pre-combustion chamber (11); one end of each of the sub-gas channels (151) is communicated with the other output end of the control valve block (2), and the other end of each of the sub-gas channels (151) is communicated with the pre-combustion chamber (11); The angle between the direction of gas flowing from the sub-gas channel (151) to the pre-combustion chamber (11) and the direction of the pre-combustion chamber (11) from top to bottom is a second angle, and the second angle is less than or equal to 90°.

7. The pre-combustion chamber structure according to claim 6, characterized in that: There are multiple sub-gas channel groups, and the multiple sub-gas channel groups are distributed at intervals along the height direction of the pre-combustion chamber (11); Along the pre-combustion chamber (11) from top to bottom, the second angles corresponding to the plurality of sub-gas channel groups gradually increase.

8. The pre-combustion chamber structure according to claim 7, characterized in that: The pre-combustion chamber (11) comprises a conical first sub-chamber (111) and a cylindrical second sub-chamber (112); along the height direction of the pre-combustion chamber (11), the first sub-chamber (111) is located above the second sub-chamber (112), and the small end of the first sub-chamber (111) is communicated with the second sub-chamber (112); For the plurality of sub-gas channel groups located in the area where the first sub-chamber (111) is located, the angle between the direction in which gas flows from the sub-gas channel (151) to the pre-combustion chamber (11) and the direction from top to bottom of the pre-combustion chamber (11) is less than 90°; for the plurality of sub-gas channel groups located in the area where the second sub-chamber (112) is located, the angle between the direction in which gas flows from the sub-gas channel (151) to the pre-combustion chamber (11) and the direction from top to bottom of the pre-combustion chamber (11) is equal to 90°.

9. The pre-combustion chamber structure according to claim 6, characterized in that: The pre-combustion chamber structure further comprises an air intake manifold (3), the input end of the air intake manifold (3) being connected to the scavenging air source and the fuel gas source, and the output end of the air intake manifold (3) being connected to the input end of the control valve block (2); The sum of the end surface areas of the output ends of the sub-gas channels (151) is equal to the intake cross-sectional area of ​​the intake manifold (3) perpendicular to its own extension direction.

10. An engine, characterized in that The invention comprises the pre-combustion chamber structure according to any one of claims 1 to 9.

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