Pre-chamber body and engine

Abstract

The embodiment of the application belongs to the technical field of engines, and particularly relates to a precombustion chamber body and an engine. The embodiment of the application aims to solve the problem of low combustion efficiency of gaseous fuel in the precombustion chamber of a related engine. The precombustion chamber body and the engine of the embodiment of the application are characterized in that an annular flow guide groove and a plurality of air inlet channels are arranged on the end face of the air inlet end of the precombustion chamber body, the axis of the air inlet channel does not pass through the axis of the precombustion chamber body, that is, the axis of the air inlet channel is arranged eccentrically relative to the axis of the precombustion chamber body. In this way, after the gaseous fuel in the annular flow guide groove flows to the precombustion chamber along the plurality of air inlet channels, the multiple streams of gaseous fuel interact and form a vortex, so that the gaseous fuel is mixed with the original gas in the precombustion chamber more uniformly.

Description

TECHNICAL FIELD

[0001] Embodiments of the present application relate to the technical field of engines, and particularly relate to a pre-chamber body and an engine. BACKGROUND

[0002] An engine can convert internal energy into mechanical energy. After fuel and air are mixed, the mixture is combusted in a cylinder to release heat energy, which causes high-temperature and high-pressure gas in the cylinder. The gas expands to push a piston to work, and then the mechanical work is output through a crank connecting rod mechanism or other mechanisms to drive a driven machine to work.

[0003] In the related art, an engine includes a cylinder liner, a cylinder head, a piston, a spark plug bushing, a spark plug and a pre-chamber body. The cylinder liner, the cylinder head and the piston form a closed main combustion chamber. The pre-chamber body and the spark plug bushing are both arranged in the cylinder head, and the pre-chamber body and the spark plug bushing enclose a pre-chamber. The spark plug is arranged in the spark plug bushing. The spark plug bushing has an air inlet channel and a flow guide groove that are in communication with each other. The pre-chamber body has a plurality of air inlet holes and a plurality of air outlet holes. The air inlet holes are in communication with the flow guide groove, and the air outlet holes are in communication with the main combustion chamber. Gaseous fuel flows from the air inlet channel to the flow guide groove. The gaseous fuel in the flow guide groove flows into the pre-chamber through the air inlet holes. The gaseous fuel in the pre-chamber mixes with the original gas in the combustion chamber. The spark plug ignites the mixture in the pre-chamber to burn the mixture, and the flame generated by the burning of the mixture is transmitted from the air outlet holes to the main combustion chamber to increase the burning speed of the gas in the main combustion chamber.

[0004] However, the gaseous fuel flowing from the flow guide groove into the pre-chamber does not mix uniformly with the original gas in the pre-chamber, which reduces the burning efficiency of the gaseous fuel in the pre-chamber. SUMMARY

[0005] In view of this, the main purpose of embodiments of the present application is to provide a pre-chamber body and an engine to solve the technical problem of low burning efficiency of gaseous fuel in the pre-chamber of the related engine.

[0006] To achieve the above-mentioned purpose, embodiments of the present application provide a pre-chamber body. The pre-chamber body is a rotary body. The pre-chamber body has a pre-chamber inside. The pre-chamber body has an air inlet end and an air outlet end. An annular flow guide groove and a plurality of air inlet channels are arranged on the end face of the air inlet end. The air inlet channels are in communication between the annular flow guide groove and the pre-chamber. The plurality of air inlet channels are arranged along the circumferential direction of the pre-chamber. The annular flow guide groove is configured to be in communication with a gas channel on a spark plug bushing. The air inlet channel has two guide side walls that are parallel to each other. The tangent line of one end of the guide side wall away from the annular flow guide groove has a first included angle with the guide side wall. The first included angle is an acute angle.

[0007] In some embodiments that can include the above-mentioned embodiments, the air inlet channel further has a guide surface located on a side of the air inlet channel away from the air inlet end, the guide surface is a bevel, and a distance between the guide surface and an end surface of the air inlet end gradually decreases from an end of the air inlet channel away from the axis of the precombustion chamber body to an end of the air inlet channel close to the precombustion chamber body.

[0008] In some embodiments that can include the above-mentioned embodiments, a cross section of the annular guide groove in a first plane in which the axis of the precombustion chamber body is located is a first circular arc, and the guide surface is tangent to the first circular arc.

[0009] In some embodiments that can include the above-mentioned embodiments, an outer side of the precombustion chamber body has a cooling wall surface, the cooling wall surface is recessed towards an inside of the precombustion chamber body, and a cross section of the cooling wall surface in a first plane in which the axis of the precombustion chamber body is located is a second circular arc.

[0010] In some embodiments that can include the above-mentioned embodiments, an outer diameter of the cooling wall surface gradually decreases from an end of the cooling wall surface close to the air inlet end to an end of the cooling wall surface away from the air inlet end.

[0011] In some embodiments that can include the above-mentioned embodiments, a distance between a center of the second circular arc and the axis of the precombustion chamber body is 0.4-0.5 times a maximum outer diameter of the precombustion chamber body, and a distance between an end of the second circular arc away from the air inlet end and the center of the second circular arc in the direction of the axis of the precombustion chamber body is 0.3-0.5 times the maximum outer diameter of the precombustion chamber body.

[0012] In some embodiments that can include the above-mentioned embodiments, the precombustion chamber body includes a first part, a second part and a third part connected in sequence in the axial direction of the precombustion chamber body, the air inlet end is located at an end of the first part away from the second part, the air outlet end is located at an end of the third part away from the first part, the precombustion chamber includes a first chamber surrounded by the first part, a second chamber surrounded by the second part and a third chamber surrounded by the third part, an outer diameter of the first chamber decreases from an end of the first chamber away from the second chamber to an end of the first chamber close to the second chamber, the cooling wall surface is located on an outer side of the first part, an outer diameter of the second chamber is equal from an end of the second chamber close to the first chamber to an end of the second chamber away from the first chamber, and an outer diameter of the third chamber gradually decreases from an end of the third chamber close to the second chamber to an end of the third chamber away from the second chamber.

[0013] The application further provides an engine, comprising a spark plug bushing, a spark plug, and the pre-chamber body in any of the above embodiments, the spark plug bushing is connected with the air inlet end of the pre-chamber body, the spark plug bushing has a spark plug cavity and a gas passage, one end of the spark plug cavity facing the pre-chamber body is in communication with the pre-chamber, the spark plug is arranged in the spark plug cavity, and the gas passage is in communication with the annular flow guide groove.

[0014] In some embodiments which can comprise the above embodiments, the engine further comprises a cylinder head, the spark plug bushing and the pre-chamber body are both connected to the cylinder head, the cylinder head has an inlet water channel and a cooling water cavity in communication, the cooling water cavity is arranged outside the pre-chamber body, and the inlet water channel is in communication with one side of the cooling water cavity close to the air outlet end.

[0015] In some embodiments which can comprise the above embodiments, the inlet water channel comprises an inlet water part and a guide part, the guide part is arranged outside the pre-chamber body, one end of the guide part along the axial direction of the pre-chamber body is in communication with the cooling water cavity, and one end of the guide part away from the cooling water cavity is in communication with the inlet water part; one end of the guide part close to the cooling water cavity is provided with a notch, and the notch is arranged towards the pre-chamber body.

[0016] The pre-chamber body and the engine provided by the application are as follows: the pre-chamber body is a rotary body, the pre-chamber body has a pre-chamber inside, the pre-chamber body has an air inlet end and an air outlet end, the end face of the air inlet end is provided with an annular flow guide groove and a plurality of air inlet channels, the air inlet channels are in communication between the annular flow guide groove and the pre-chamber, and the plurality of air inlet channels are arranged at intervals along the circumferential direction of the pre-chamber; the air inlet channel has two guide side walls which are parallel to each other, and the tangent line of one end of the guide side wall away from the annular flow guide groove has a first included angle with the guide side wall, and the first included angle is an acute angle. By arranging the annular flow guide groove and the plurality of air inlet channels on the end face of the air inlet end of the pre-chamber body, the axis of the air inlet channel does not pass through the axis of the pre-chamber body, that is, the axis of the air inlet channel is arranged eccentrically relative to the axis of the pre-chamber body, so that after the gaseous fuel in the annular flow guide groove flows to the pre-chamber along the plurality of air inlet channels, the plurality of gaseous fuel streams interact and form a vortex, thereby making the gaseous fuel mix with the original gas in the pre-chamber more uniformly. BRIEF DESCRIPTION OF DRAWINGS

[0017] In order to more clearly illustrate the technical solutions in the embodiments of the application or the prior art, the following will briefly introduce the drawings needed to be used in the embodiments or the prior art description. Obviously, the drawings in the following description are some embodiments of the application, and other drawings can also be obtained by those skilled in the art without any creative effort on the basis of these drawings.

[0018] Figure 1 A cross section of a cylinder head, a spark plug bushing, a spark plug, a cylinder liner and a pre-chamber body in an engine according to an embodiment of the present application Figure 1 ;

[0019] Figure 2 A cross section of a cylinder head, a spark plug bushing, a spark plug, a cylinder liner and a pre-chamber body in an engine according to an embodiment of the present application Figure 2 ;

[0020] Figure 3 An enlarged schematic view of the portion P in the figure Figure 2 ;

[0021] Figure 4 A cross section of a pre-chamber body along a first plane according to an embodiment of the present application

[0022] Figure 5 A schematic view of a structure of a pre-chamber body according to an embodiment of the present application when viewed from an end face of an air intake end.

[0023] Explanation of reference numerals:

[0024] 10, pre-chamber body; 101, pre-chamber

[0025] 110, annular flow guide groove

[0026] 120, air intake passage; 121, guide side wall; 122, guide surface

[0027] 130, cooling wall surface

[0028] 140, first portion; 141, first chamber

[0029] 150, second portion; 151, second chamber

[0030] 160, third portion; 161, third chamber; 162, air outlet passage

[0031] 20, cylinder head

[0032] 210, water inlet passage

[0033] 211, water inlet portion

[0034] 212, guide portion; 2121, notch

[0035] 220, cooling water chamber

[0036] 30, spark plug bushing; 301, spark plug chamber; 302, gas passage

[0037] 40, spark plug

[0038] 50. Cylinder liner

[0039] α, first included angle; β, second included angle. DETAILED DESCRIPTION

[0040] First, those skilled in the art should understand that the embodiments are only used to explain the technical principles of the present application, and are not intended to limit the protection scope of the present application. Those skilled in the art can make adjustments as needed to adapt to specific application occasions.

[0041] Secondly, it should be noted that in the description of the embodiments of the present application, the terms indicating the direction or positional relationship of "in", "out" and the like are based on the direction or positional relationship shown in the drawings, which is only for the convenience of description, and does not indicate or imply that the device or component must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present application.

[0042] In addition, it should be noted that in the description of the embodiments of the present application, unless otherwise explicitly specified and limited, the terms "connected", "connected" should be understood broadly, for example, it can be fixedly connected, or it can be detachably connected, or integrally connected; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium, or it can be connected inside two components. For those skilled in the art, the specific meaning of the above terms in the embodiments of the present application can be understood according to the specific circumstances.

[0043] In order to make the purpose, technical scheme and advantages of the embodiments of the present application clearer, the technical scheme in the embodiments of the present application will be described clearly and completely below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, not all embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of protection of the present application.

[0044] As described in the background, the engine in the related art has the problem of low combustion efficiency of gaseous fuel in the pre-chamber. The applicant found that the reason for this problem is that in the related engine, an intake passage and a flow guide groove are provided on the spark plug liner, and a plurality of intake holes are provided on the pre-chamber body, the axis of the intake hole is usually arranged along the radial direction of the pre-chamber body, and after the gaseous fuel in the flow guide groove flows to the pre-chamber along the intake hole, the gaseous fuel flow is also roughly gathered to the center along the radial direction of the pre-chamber body, and is not easy to flow toward the gas outlet hole, resulting in that the gaseous fuel is not fully and uniformly mixed with the original gas in the pre-chamber, and further resulting in that after the spark plug is ignited, the combustion efficiency of the gaseous fuel in the pre-chamber is reduced.

[0045] To solve the above technical problems, the embodiment of the present application provides a precombustion chamber body and an engine. The precombustion chamber body is provided with an annular flow guide groove and a plurality of air inlet channels on the end face of the air inlet end. The axis of the air inlet channel does not pass through the axis of the precombustion chamber body, that is, the axis of the air inlet channel is eccentric relative to the axis of the precombustion chamber body. After the gaseous fuel in the annular flow guide groove flows to the precombustion chamber along the plurality of air inlet channels, the multiple streams of gaseous fuel interact and form a vortex, so that the gaseous fuel is mixed with the original gas in the precombustion chamber more uniformly.

[0046] The principles and characteristics of the embodiments of the present application are described below in combination with the drawings. The examples are only used to explain the embodiments of the present application and are not used to limit the scope of the embodiments of the present application.

[0047] Reference Figures 1-3 The embodiment provides a precombustion chamber body 10. The precombustion chamber body 10 is a rotary body. The precombustion chamber body 10 has a precombustion chamber 101 inside. The precombustion chamber 101 is a rotary chamber. The precombustion chamber body 10 has an air inlet end and an air outlet end. One end of the precombustion chamber 101 close to the air inlet end has an opening. After the precombustion chamber body 10 is connected with a spark plug sleeve 30, the precombustion chamber 101 is in communication with a spark plug cavity 301 on the spark plug sleeve 30 through the opening. The spark plug cavity 301 is used to install a spark plug 40.

[0048] Reference Figure 4 The end face of the air inlet end is provided with an annular flow guide groove 110 and a plurality of air inlet channels 120. The air inlet channels 120 are in communication between the annular flow guide groove 110 and the precombustion chamber 101. The plurality of air inlet channels 120 are arranged in a circumferential direction of the precombustion chamber 101. The plurality of air inlet channels 120 have the same rotational direction relative to the axis of the precombustion chamber body 10.

[0049] Reference Figure 5 When viewed from the end face of the air inlet end, the air inlet channel 120 has two guide side walls 121 which are parallel to each other. The tangent line of one end of the guide side wall 121 away from the annular flow guide groove 110 has a first included angle α with the guide side wall 121. The first included angle α is an acute angle. That is, the axis of the air inlet channel 120 does not pass through the axis of the precombustion chamber body 10. The axis of the air inlet channel 120 is eccentric relative to the axis of the precombustion chamber body 10. After the gaseous fuel in the annular flow guide groove 110 flows to the precombustion chamber 101 along the plurality of air inlet channels 120, the multiple streams of gaseous fuel do not converge at the axis of the precombustion chamber body 10, but interact and form a vortex at a position close to the side wall of the precombustion chamber 101 in the precombustion chamber 101. Therefore, the gaseous fuel is mixed with the original gas in the precombustion chamber 101 more uniformly, and the combustion efficiency of the gaseous fuel in the precombustion chamber 101 is improved.

[0050] When the first included angle α is in the range of 30°≤α<90°, the vortex formed by the gaseous fuel flowing from the gas inlet channel 120 into the pre-chamber 101 has a good mixing effect on the gas.

[0051] With reference to the foregoing description Figure 4 In some embodiments, the gas inlet channel 120 further has a guide surface 122 located on the side of the gas inlet channel 120 away from the gas inlet end, the guide surface 122 is arranged obliquely relative to the end surface of the gas inlet end, and the distance between the guide surface 122 and the end surface of the gas inlet end gradually decreases from the end of the gas inlet channel 120 away from the axis of the pre-chamber body 10 to the end of the gas inlet channel 120 close to the axis of the pre-chamber body 10.

[0052] In the axis of the pre-chamber body 10 and the first plane where the guide surface 122 is located, the guide surface 122 has a second included angle β with a second plane perpendicular to the axis of the pre-chamber body 10, the second included angle β is an acute angle, and the second plane is perpendicular to the first plane.

[0053] When the gaseous fuel in the annular flow guide groove 110 flows along the gas inlet channel 120, the guide surface 122 can guide the gaseous fuel to flow away from the gas outlet end, so that the gaseous fuel flowing out of the gas inlet channel 120 can be closer to the end surface of the gas inlet end. After the spark plug 40 is installed in the spark plug sleeve 30 and the pre-chamber body 10 is installed in the spark plug sleeve 30, the end of the spark plug cavity 301 is close to the end surface of the gas inlet end, and the gaseous fuel flowing out of the gas inlet channel 120 can be closer to the spark plug 40, so that the spark plug 40 can fully ignite the gaseous fuel flowing out of the gas inlet channel 120, thereby improving the combustion efficiency of the gaseous fuel in the pre-chamber 101.

[0054] In addition, the guide surface 122 guides the gaseous fuel flowing out of the gas inlet channel 120 to flow away from the gas outlet end, so that the height of the gas mixture in the pre-chamber 101 increases, that is, the height of the gas flowing along the axis of the pre-chamber body 10 in the pre-chamber 101 increases, so that the gas mixture in the pre-chamber 101 is more uniform.

[0055] The guide surface 122 guides the gaseous fuel flowing out of the gas inlet channel 120 to flow away from the gas outlet end, so that the gaseous fuel flowing into the pre-chamber 101 from the gas inlet channel 120 interacts and forms a rolling flow flowing toward the gas outlet end. The rolling flow can make the gaseous fuel and the original gas in the pre-chamber 101 mix more uniformly, so that the combustion efficiency of the gaseous fuel in the pre-chamber 101 is higher.

[0056] The second included angle β can be in the range of 0°<β≤20°, so that the gaseous fuel entering the pre-chamber 101 from the gas inlet channel 120 can form a rolling flow, and the guide surface 122 can avoid guiding the gaseous fuel too far away from the gas outlet end, so that the flame is concentrated in the spark plug cavity 301 and is not easy to flow into the pre-chamber 101.

[0057] In some embodiments, the head of the spark plug 40 can be spaced apart from the end face of the intake end of the pre-chamber body 10 to avoid sintering of the head of the spark plug 40. The height H between the head of the spark plug 40 and the end face of the intake end of the pre-chamber body 10 can be related to the first angle a and the second angle β as follows: H = 3 - 1.2 sin a x cos β. As the first angle a increases, the vortex intensity decreases, and thus the height H needs to be reduced to ensure the optimal ignition position of the gas. As the second angle β increases, the rolling flow is enhanced, and thus the height H needs to be increased to ensure the optimal ignition position of the gas.

[0058] Further, the cross section of the groove wall of the annular flow guide groove 110 in the first plane where the axis of the pre-chamber body 10 is located is a first circular arc, and the guide surface 122 is tangent to the first circular arc, so that the gaseous fuel can more easily and quickly flow into the intake passage 120 along the groove wall of the annular flow guide groove 110 from the outside to the inside.

[0059] Reference Figure 2 , Figure 3 and Figure 4 In some embodiments, the outer side of the pre-chamber body 10 described above can have a cooling wall surface 130 recessed towards the inside of the pre-chamber body 10, and the cross section of the cooling wall surface 130 in the first plane where the axis of the pre-chamber body 10 is located is a second circular arc. The cooling wall surface 130 is recessed towards the inside of the pre-chamber body 10 to reduce the thickness of the pre-chamber body 10 corresponding to the cooling wall surface 130, thereby improving the cooling effect of the cooling water cavity 220 on the pre-chamber body 10 on the cylinder head 20 and strengthening the cooling of the pre-chamber body 10.

[0060] The second circular arc can also reduce the flow resistance of the cooling water in the cooling water cavity 220 when flowing through the cooling wall surface 130, and the cooling water flows more smoothly along the cooling wall surface 130, thereby improving the heat exchange efficiency between the cooling water and the pre-chamber body 10.

[0061] In some embodiments, the outer diameter of the cooling wall surface 130 gradually decreases from the end close to the intake end to the end away from the intake end, so that the cooling wall surface 130 slowly extends outward from the end away from the intake end to the end close to the intake end without obvious bending. After the pre-chamber body 10 and the cylinder head 20 are assembled, the cooling water in the cooling water cavity 220 of the cylinder flows more smoothly along the cooling wall surface 130, and the flow direction of the cooling water does not change significantly, thereby reducing the energy loss of the cooling water and improving the heat exchange efficiency between the cooling water and the pre-chamber body 10.

[0062] In some embodiments, the distance between the center of the second circular arc and the axis of the pre-chamber body 10 can be 0.4-0.5 times the maximum outer diameter of the pre-chamber body 10; along the axial direction of the pre-chamber body 10, the distance between the end of the second circular arc away from the intake end and the center of the second circular arc can be 0.3-0.5 times the maximum outer diameter of the pre-chamber body 10, so that the corresponding center of the water flow and the corresponding center of the cooling wall 130 can coincide as much as possible, so that the water flow can take away more heat from the surface of the pre-chamber body 10, which can improve the heat exchange effect between the pre-chamber body 10 and the cooling water, so that the pre-chamber body 10 can be quickly cooled, and can also improve the structural strength of the pre-chamber body 10, so as to avoid that the thickness of the pre-chamber body 10 is too small to reduce the strength of the pre-chamber body 10.

[0063] Reference Figure 4 The pre-chamber body 10 described above can include a first portion 140, a second portion 150 and a third portion 160 connected in sequence along the axial direction of the pre-chamber body 10, the intake end is located at one end of the first portion 140 away from the second portion 150, and the exhaust end is located at one end of the third portion 160 away from the first portion 140, the pre-chamber 101 includes a first chamber 141 surrounded by the first portion 140, a second chamber 151 surrounded by the second portion 150, and a third chamber 161 surrounded by the third portion 160, the outer diameter of the first chamber 141 decreases from the end away from the second chamber 151 to the end close to the second chamber 151, and the cooling wall 130 is located on the outside of the first portion 140, the gas in the pre-chamber 101 is mainly burned in the first chamber 141, and the cooling wall 130 is arranged on the outside of the first portion 140 to mainly cool the first portion 140, so as to reduce the temperature gradient of the first portion 140, the second portion 150 and the third portion 160.

[0064] The outer diameter of the second chamber 151 is equal from the end close to the first chamber 141 to the end away from the first chamber 141, so as to conduct the flame after the gas is burned to the third chamber 161. The outer diameter of the third chamber 161 gradually decreases from the end close to the second chamber 151 to the end away from the second chamber 151, the third portion 160 is provided with a plurality of exhaust passages 162 arranged at intervals along the circumferential direction of the third portion 160, the axis of the exhaust passage 162 passes through the axis of the pre-chamber body 10, the angle between the exhaust direction of the exhaust passage 162 and the second plane is an acute angle, and the exhaust direction of the exhaust passage 162 is away from the intake end, so as to spread the flame in the pre-chamber 101 to the main combustion chamber of the engine, so as to improve the burning speed of the gas in the main combustion chamber.

[0065] Reference Figures 1-5The engine of the present application comprises a cylinder head 20, a spark plug sleeve 30, a spark plug 40, a cylinder sleeve 50, and the precombustion chamber body 10 of the above-mentioned embodiments. The cylinder head 20 is connected with the cylinder sleeve 50 and encloses a main combustion chamber. The spark plug sleeve 30 has a spark plug cavity 301 and a gas passage 302 which are independent of each other. The spark plug 40 is arranged in the spark plug cavity 301. The spark plug sleeve 30 is arranged in the cylinder head 20. The spark plug cavity 301 is in communication with the precombustion chamber 101. The gas passage 302 is in communication with the annular flow guide groove 110. The gaseous fuel is transported into the precombustion chamber 101 from the gas passage 302. The gaseous fuel flows into the precombustion chamber 101 from the gas passage 302, the annular flow guide groove 110 and the intake passage 120 in sequence. The gaseous fuel mixes with the original gas in the precombustion chamber 101 and is ignited by the spark plug 40. The original gas in the precombustion chamber 101 can be air or a mixture of air and gaseous fuel.

[0066] The cylinder head 20 has an intake passage 210 and a cooling water cavity 220 which are in communication. The cooling water cavity 220 encloses the precombustion chamber body 10. The intake passage 210 is in communication with the side of the cooling water cavity 220 close to the outlet end.

[0067] The cooling water is continuously transported from the intake passage 210 to the cooling water cavity 220. The cooling water in the cooling water cavity 220 exchanges heat with the precombustion chamber body 10 to reduce the temperature of the precombustion chamber body 10 and reduce the temperature gradient of the precombustion chamber body 10 along the axial direction.

[0068] In the implementation mode in which the precombustion chamber body 10 has a cooling wall surface 130, the cooling water cavity 220 encloses the periphery of the cooling wall surface 130 to reduce the temperature of the precombustion chamber body 10 corresponding to the cooling wall surface 130.

[0069] In some embodiments, the intake passage 210 can comprise an intake portion 211 and a guide portion 212. The guide portion 212 encloses the outside of the precombustion chamber body 10. The guide portion 212 is in communication with the cooling water cavity 220 at one end along the axial direction of the precombustion chamber body 10. The end of the guide portion 212 away from the cooling water cavity 220 is in communication with the intake portion 211. The end of the guide portion 212 close to the cooling water cavity 220 is provided with a gap 2121 which is arranged towards the precombustion chamber body 10. The cooling water can flow directly from the gap 2121 to the precombustion chamber body 10 and flow to the cooling water cavity 220 along the outside of the precombustion chamber body 10 or the cooling wall surface 130, thereby improving the cooling effect of the precombustion chamber body 10.

[0070] The engine of the present application comprises the precombustion chamber body 10 of the above-mentioned embodiments. The specific structure, working principle and functions of the precombustion chamber body 10 have been described in detail in the above-mentioned embodiments, which will not be described here.

[0071] It should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, and are not intended to limit the present application; although the present application has been described in detail with reference to the above embodiments, those skilled in the art should understand that the technical solutions recorded in the above embodiments can still be modified, or some or all of the technical features can be replaced by equivalents; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present application.

Claims

1. A prechamber body, characterized by, The precombustion chamber body is a rotary body, the precombustion chamber body has a precombustion chamber inside, the precombustion chamber body has an air inlet end and an air outlet end, an annular flow guide groove and a plurality of air inlet channels for gaseous fuel flow are arranged on the end face of the air inlet end, the air inlet channels are communicated between the annular flow guide groove and the precombustion chamber, and the plurality of air inlet channels are arranged in a circumferential direction of the precombustion chamber. The air inlet channel has two guide side walls parallel to each other, and a tangent line of one end of the guide side wall away from the annular flow guide groove has a first included angle with the guide side wall, and the first included angle is an acute angle. The outer side of the precombustion chamber body has a cooling wall surface, the cooling wall surface is recessed towards the inside of the precombustion chamber body, and the cross section of the cooling wall surface in a first plane where the axis of the precombustion chamber body is located is a second circular arc. The distance between the center of the second circular arc and the axis of the precombustion chamber body is 0.4-0.5 times the maximum outer diameter of the precombustion chamber body, and the distance between one end of the second circular arc away from the air inlet end and the center of the second circular arc in the direction of the axis of the precombustion chamber body is 0.3-0.5 times the maximum outer diameter of the precombustion chamber body.

2. The pre-chamber body of claim 1, wherein, The air inlet channel also has a guide surface, the guide surface is located on the side of the air inlet channel away from the air inlet end, the guide surface is an inclined surface, and the distance between the guide surface and the end face of the air inlet end gradually decreases from one end of the air inlet channel away from the axis of the precombustion chamber body to one end of the air inlet channel close to the precombustion chamber body.

3. The prechamber body of claim 2, wherein, The cross section of the groove wall of the annular flow guide groove in the first plane where the axis of the precombustion chamber body is located is a first circular arc, and the guide surface is tangent to the first circular arc.

4. The prechamber body of claim 1, wherein The outer diameter of the cooling wall surface gradually decreases from one end of the cooling wall surface close to the air inlet end to one end of the cooling wall surface away from the air inlet end.

5. The prechamber body of claim 1, wherein The precombustion chamber body includes a first part, a second part and a third part connected in sequence in the axial direction of the precombustion chamber body, the air inlet end is located at one end of the first part away from the second part, the air outlet end is located at one end of the third part away from the first part, the precombustion chamber includes a first chamber surrounded by the first part, a second chamber surrounded by the second part and a third chamber surrounded by the third part, the outer diameter of the first chamber decreases from one end away from the second chamber to one end close to the second chamber, the cooling wall surface is located on the outer side of the first part, the outer diameter of the second chamber is equal from one end close to the first chamber to one end away from the first chamber, and the outer diameter of the third chamber gradually decreases from one end close to the second chamber to one end away from the second chamber.

6. An engine characterized by, The precombustion chamber body includes a spark plug sleeve, a spark plug and the precombustion chamber body of any one of claims 1-5, the spark plug sleeve is connected with the air inlet end of the precombustion chamber body, the spark plug sleeve has a spark plug cavity and a gas channel inside, one end of the spark plug cavity towards the precombustion chamber body is communicated with the precombustion chamber, the spark plug is arranged in the spark plug cavity, and the gas channel is communicated with the annular flow guide groove.

7. The engine of claim 6, wherein The engine further comprises a cylinder head, the spark plug bushing and the precombustion chamber body are connected to the cylinder head, the cylinder head has a water inlet channel and a cooling water cavity in communication, the cooling water cavity is arranged outside the precombustion chamber body, and the water inlet channel is in communication with one side of the cooling water cavity close to the gas outlet end.

8. The engine of claim 7, wherein, The water inlet channel comprises a water inlet portion and a guide portion, the guide portion is arranged outside the precombustion chamber body, one end of the guide portion in the axial direction of the precombustion chamber body is in communication with the cooling water cavity, and the other end of the guide portion away from the cooling water cavity is in communication with the water inlet portion. One end of the guide portion close to the cooling water cavity is provided with a notch, and the notch is arranged towards the precombustion chamber body.

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