Crankcase ventilation system of hydrogen internal combustion engine and vehicle

Abstract

The utility model discloses a hydrogen internal combustion engine crankcase ventilation system and a vehicle, the hydrogen internal combustion engine crankcase ventilation system comprises a combustion chamber, and the hydrogen internal combustion engine crankcase ventilation system comprises a crankcase, an oil-gas separator and a Venturi device. An inlet of the oil-gas separator is communicated with an outlet of the crankcase, and the oil-gas separator is used for separating blow-by gas from the crankcase; the Venturi device comprises a pipe body, the pipe body is provided with a first gas inlet, a contraction channel, a gas channel and a gas outlet, the contraction channel is used for guiding in positive pressure gas, the radial size of the contraction channel is smaller than that of the gas channel, an outlet of the contraction channel is communicated with the gas channel, and one end of the first gas inlet is communicated with an outlet of the oil-gas separator; the other end of the first gas inlet is communicated with the gas channel, the gas channel is communicated with one end of the gas outlet, and the gas outlet is communicated with an inlet of the combustion chamber. According to the crankcase ventilation system of the hydrogen internal combustion engine, negative pressure can be maintained in the crankcase.

Description

Technical Field

[0001] The present application relates to the field of gas concentration control, and particularly to a crankcase ventilation system for a hydrogen internal combustion engine and a vehicle. Background Art

[0002] What is provided in this section is only background information related to the present disclosure, and it is not necessarily prior art.

[0003] Hydrogen has high diffusivity and permeability. After the hydrogen engine system operates for a long time, it is difficult to maintain the volume concentration of hydrogen in the crankcase at a low level, thus easily generating safety risks.

[0004] In order to prevent the volume concentration of hydrogen in the crankcase from exceeding the safety threshold, it is necessary to make the negative pressure in the crankcase meet the requirements. Therefore, how to maintain a negative pressure in the crankcase is an important research direction. Summary of the Utility Model

[0005] The purpose of the present application is to at least solve the problem of maintaining a negative pressure in the crankcase. This purpose is achieved in the following manner:

[0006] A first aspect of the present application provides a crankcase ventilation system for a hydrogen internal combustion engine. The hydrogen internal combustion engine includes a combustion chamber. The crankcase ventilation system for the hydrogen internal combustion engine includes a crankcase, an oil-gas separator, and a Venturi device. The inlet of the oil-gas separator is communicated with the outlet of the crankcase for separating the blow-by gas from the crankcase. The Venturi device includes a pipe body provided with a first air inlet, a contraction channel, a gas channel, and an air outlet. The contraction channel is used for introducing positive pressure gas, and the radial dimension of the contraction channel is smaller than that of the gas channel. The outlet of the contraction channel is communicated with the gas channel. One end of the first air inlet is communicated with the outlet of the oil-gas separator for introducing the separated blow-by gas, the other end of the first air inlet is communicated with the gas channel, the gas channel is communicated with one end of the air outlet, and the air outlet is communicated with the inlet of the combustion chamber.

[0007] In the crankcase ventilation system for a hydrogen internal combustion engine according to the embodiments of the present application, a negative pressure is generated through the contraction channel and a negative pressure is provided for the oil-gas separator, thereby enhancing the pumping ability of the oil-gas separator, so that a negative pressure can be maintained in the crankcase, and thus the hydrogen in the crankcase can be maintained at a low level.

[0008] In some embodiments, the Venturi device further includes a heating plate, and at least a part of the heating plate forms the side wall of the gas channel and is located at one end of the gas channel close to the contraction channel.

[0009] In some embodiments, the Venturi device includes a diversion portion connected to the pipe body. The diversion portion is located within the gas passage. The diversion portion defines a diversion passage that penetrates through the diversion portion. The outlet of the contraction passage and the first air inlet are both in communication with the inlet of the diversion passage.

[0010] In some embodiments, the outlet of the diversion passage is in communication with the gas passage, and at least a portion of the heating plate is thermally connected to at least a portion of the diversion portion.

[0011] In some embodiments, the radial dimension of the diversion passage is greater than the radial dimension of the contraction passage, and the radial dimension of the diversion passage is less than the radial dimension of the gas passage.

[0012] In some embodiments, the Venturi device further includes a gas guiding portion connected to the pipe body. The gas guiding portion is provided with a gas guiding passage. One end of the gas guiding passage is in communication with the first air inlet, and the other end of the gas guiding passage is in communication with the outlet of the oil-gas separator. The gas guiding portion is provided with an air extraction port in communication with the gas guiding passage, and the air extraction port houses a hydrogen concentration sensor.

[0013] In some embodiments, the Venturi device further includes a rubber tube. The first end of the rubber tube is sleeved on the gas guiding portion and is in communication with the gas guiding passage. The rubber tube is in communication with the outlet of the oil-gas separator.

[0014] In some embodiments, the second end of the rubber tube is provided with a quick connector and a diagnostic plug. The quick connector is plugged into the oil-gas separator, and the diagnostic plug is configured to conduct a diagnostic circuit after being plugged in. And / or, the Venturi device further includes an anti-abrasion sheath sleeved on the rubber tube.

[0015] In some embodiments, the outer peripheral wall of the pipe body is provided with a quick-insertion structure adapted to be plugged; and / or, the pipe body is further provided with a second air inlet in communication with the inlet of the contraction passage, and the radial dimension of the second air inlet is greater than the radial dimension of the contraction passage.

[0016] A second aspect of the present application provides a vehicle, including a hydrogen internal combustion engine and the hydrogen internal combustion engine crankcase ventilation system as described in the first aspect above. The hydrogen internal combustion engine includes a combustion chamber, and the air outlet of the pipe body is in communication with the inlet of the combustion chamber. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Various other advantages and benefits will become apparent to those of ordinary skill in the art upon reading the following detailed description of the preferred embodiments. The drawings are only for the purpose of showing the preferred embodiments and are not considered to be a limitation of the present application. Also, throughout the drawings, the same reference numerals are used to denote the same components. Wherein:

[0018] Figure 1 Schematic diagram of the Venturi device according to an embodiment of the present application;

[0019] Figure 2 Schematic diagram of another perspective of the Venturi device according to an embodiment of the present application;

[0020] Figure 3 Schematic diagram of the crankcase ventilation system of a hydrogen internal combustion engine according to an embodiment of the present application.

[0021] The reference numerals in the drawings are represented as follows:

[0022] 100, Venturi device; 200, combustion chamber; 300, crankcase; 400, oil-gas separator; 500, crankcase ventilation system of hydrogen internal combustion engine;

[0023] 1, pipe body; 11, first air inlet; 12, contraction channel; 13, gas channel; 14, air outlet; 15, second air inlet; 16, quick-connect structure;

[0024] 2, heating plate;

[0025] 3, diversion part; 31, diversion channel;

[0026] 4, air guiding part; 41, air guiding channel; 42, air intake port;

[0027] 5, rubber tube; 51, quick-connect fitting; 52, diagnostic plug-in;

[0028] 6, anti-abrasion sheath. Detailed implementation manners

[0029] The exemplary embodiments of the present application will be described in more detail below with reference to the drawings. Although the exemplary embodiments of the present application are shown in the drawings, it should be understood that the present application can be implemented in various forms and should not be limited by the embodiments set forth herein. On the contrary, these embodiments are provided so that the present application can be more thoroughly understood and the scope of the present application can be fully conveyed to those skilled in the art.

[0030] It should be understood that the terms used herein are for the purpose of describing particular example embodiments only and are not intended to be limiting. Unless the context clearly dictates otherwise, the singular forms "a", "an", and "the" as used herein may also include the plural forms. The terms "comprising", "including", "containing", and "having" are inclusive and thus specify the presence of stated features, steps, operations, elements, and / or components, but do not preclude the presence or addition of one or more other features, steps, operations, elements, components, and / or combinations thereof. The method steps, processes, and operations described herein are not to be construed as necessarily requiring their performance in the particular order described or illustrated, unless an execution order is explicitly stated. It should also be understood that additional or alternative steps may be used.

[0031] Although the terms first, second, third, etc. may be used herein to describe multiple elements, components, regions, layers, and / or sections, these elements, components, regions, layers, and / or sections should not be limited by these terms. These terms may be used only to distinguish one element, component, region, layer, or section from another. Unless the context clearly indicates otherwise, terms such as "first", "second", and other numerical terms when used herein do not imply an order or sequence. Thus, the first element, component, region, layer, or section discussed below may be referred to as the second element, component, region, layer, or section without departing from the teachings of the example embodiments. In the description of this application, "a plurality of" means at least two, such as two, three, etc., unless otherwise specifically and clearly defined.

[0032] For ease of description, spatial relative relationship terms may be used herein to describe the relationship of one element or feature shown in the figures to another element or feature, such as "inside", "outside", "inner side", "outer side", "below", "beneath", "above", "over", etc. Such spatial relative relationship terms are intended to include different orientations of the device in use or operation in addition to the orientation depicted in the figures. For example, if the device in the figures is rotated, an element described as "below" or "beneath" another element or feature will then be oriented "above" or "over" the other element or feature. Thus, the example term "below" can include both the above and below orientations. The device may be otherwise oriented (rotated 90 degrees or in other directions) and the spatial relative relationship descriptors used herein are to be interpreted accordingly.

[0033] In the description of the application, the orientation or positional relationship indicated by technical terms such as "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "circumferential", "height direction", "first direction", "second direction", etc. is based on the orientation or positional relationship shown in the drawings. This is only for the convenience of describing the embodiments of the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed, operated, or used in a specific orientation. Therefore, it should not be construed as a limitation on the embodiments of the present application.

[0034] In the present application, unless otherwise clearly defined and limited, terms such as "installed", "connected", "connected to", "fixed", 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 communicable with each other; it can be directly connected, or indirectly connected through an intermediate medium. It can be the communication inside two elements or the interaction relationship between two elements, unless otherwise clearly defined. For those of ordinary skill in the art, the specific meanings of the above terms in the present application can be understood according to specific circumstances.

[0035] A hydrogen engine is an internal combustion engine that uses hydrogen as fuel. The hydrogen engine generates power by burning hydrogen. Compared with traditional gasoline or diesel engines, the emissions of the hydrogen engine are mainly water, which has less impact on the environment. The hydrogen engine has characteristics such as high calorific value, low ignition energy requirement, and fast flame propagation speed during the combustion process, so it theoretically has high thermal efficiency and low emissions.

[0036] However, the hydrogen engine faces some technical challenges in terms of durability. Due to the high diffusivity and permeability of hydrogen, after the engine runs for a long time, it is difficult to keep the volume concentration of hydrogen in the crankcase at a low level, which is likely to cause safety problems such as hydrogen leakage and explosion.

[0037] However, the hydrogen engine faces some technical challenges in terms of durability. Due to the high diffusivity and permeability of hydrogen, after the engine runs for a long time, it is difficult to keep the volume concentration of hydrogen in the crankcase at a low level, which is likely to cause safety problems such as hydrogen leakage and explosion.

[0038] Therefore, it is necessary to make the negative pressure in the crankcase meet the requirements so that hydrogen can be discharged from the crankcase. Therefore, how to maintain a negative pressure in the crankcase is an important research direction.

[0039] To at least solve the problem of maintaining a negative pressure in the crankcase, an embodiment of the present application proposes a crankcase ventilation system 500 for a hydrogen internal combustion engine, which can maintain a negative pressure in the crankcase 300.

[0040] An embodiment of the present application also provides a vehicle including the hydrogen internal combustion engine crankcase ventilation system 500 as described in the above embodiment.

[0041] The following introduces the hydrogen internal combustion engine crankcase ventilation system 500 and the vehicle according to the embodiments of the present application in conjunction with the accompanying drawings.

[0042] Combined Figure 1 、 Figure 2 and Figure 3 As shown, for the hydrogen internal combustion engine crankcase ventilation system 500 according to the embodiments of the present application, the hydrogen internal combustion engine includes a combustion chamber 200, and the hydrogen internal combustion engine crankcase ventilation system 500 includes a crankcase 300, an oil-gas separator 400, and a Venturi device 100. The inlet of the oil-gas separator 400 is communicated with the outlet of the crankcase 300 and is used for separating the blow-by gas from the crankcase 300; the Venturi device 100 includes a pipe body 1, and the pipe body 1 is provided with a first air inlet 11, a contraction channel 12, a gas channel 13, and an air outlet 14. The contraction channel 12 is used for introducing positive pressure gas, the radial dimension of the contraction channel 12 is smaller than the radial dimension of the gas channel 13, the outlet of the contraction channel 12 is communicated with the gas channel 13, one end of the first air inlet 11 is communicated with the outlet of the oil-gas separator 400 and is used for introducing the separated blow-by gas, the other end of the first air inlet 11 is communicated with the gas channel 13, the gas channel 13 is communicated with one end of the air outlet 14, and the air outlet 14 is communicated with the inlet of the combustion chamber 200.

[0043] During the operation of the hydrogen internal combustion engine, the gas in the combustion chamber 200 leaks into the crankcase 300 to form blow-by gas, and the blow-by gas includes hydrogen, oil gas and other gases. Through the separation function of the oil-gas separator 400, the oil gas in the blow-by gas can be separated.

[0044] The positive pressure gas refers to the gas with a pressure higher than that of the blow-by gas. Due to the pressure difference between the positive pressure gas and the blow-by gas, the positive pressure gas can enter the gas channel 13 through the contraction channel 12.

[0045] The outlet of the oil-gas separator 400 is communicated with the first air inlet 11, which can be directly communicated or the outlet of the oil-gas separator 400 and the first air inlet 11 can be indirectly communicated through other media.

[0046] The Venturi effect refers to the effect that when a fluid passes through a narrow part of a pipeline, the flow rate increases and the pressure decreases.

[0047] Since the radial dimension of the contraction channel 12 is smaller than that of the gas channel 13, according to the Venturi effect, after the positive-pressure gas passes through the contraction channel 12, the pressure decreases and becomes negative pressure. Since the first air inlet 11 is used to communicate with the crankcase 300 and introduce blow-by gas, the Venturi device 100 of the embodiment of the present application can provide a negative pressure for the oil-gas separator 400, thereby strengthening the pumping ability of the oil-gas separator 400, enabling the oil-gas separator 400 to discharge the blow-by gas in the crankcase 300, so that a negative pressure can be maintained in the crankcase 300, and thus the hydrogen in the crankcase 300 can be maintained at a relatively low level.

[0048] The crankcase ventilation system 500 of the hydrogen internal combustion engine according to the embodiment of the present application generates a negative pressure through the contraction channel 12 and provides a negative pressure for the oil-gas separator 400, thereby strengthening the pumping ability of the oil-gas separator 400, so that a negative pressure can be maintained in the crankcase 300, and thus the hydrogen in the crankcase 300 can be maintained at a relatively low level.

[0049] As Figure 1 shown, in some embodiments, the Venturi device 100 further includes a heating plate 2, and at least part of the heating plate 2 forms the side wall of the gas channel 13 and is located at one end of the gas channel 13 close to the contraction channel 12.

[0050] By making at least part of the heating plate 2 form the side wall of the gas channel 13 and making this at least part of the heating plate 2 located at one end of the gas channel 13 close to the contraction channel 12, the gas in the gas channel can be heated, and the gas in part of the contraction channel 12 can be heated, so as to avoid icing inside the pipe body 1, increase the operating stability of the Venturi device 100 of the embodiment of the present application, and further enable the Venturi device 100 to provide a negative pressure into the crankcase 300, so that the hydrogen in the crankcase 300 can be more stably maintained at a relatively low level.

[0051] As Figure 1 shown, further, part of the heating plate 2 forms the side wall of the gas channel 13, and part of the heating plate 2 is disposed opposite to the contraction channel 12 in the radial direction of the pipe body 1.

[0052] By disposing part of the heating plate 2 opposite to the contraction channel 12 in the radial direction of the pipe body 1, the gas in the contraction channel 12 can be heated, so as to further avoid icing inside the pipe body 1 and further increase the operating stability of the Venturi device 100 of the embodiment of the present application.

[0053] Combined Figure 1 and Figure 2As shown, in some embodiments, the Venturi device 100 includes a diversion portion 3 connected to the pipe body 1. The diversion portion 3 is located within the gas passage 13. The diversion portion 3 defines a diversion passage 31 that penetrates through the diversion portion 3. The outlet of the contraction passage 12 and the first air inlet 11 are both in communication with the inlet of the diversion passage 31. The outlet of the diversion passage 31 is in communication with the gas passage 13.

[0054] Within the diversion passage 31, the leakage gas and the gas discharged from the contraction passage 12 can be mixed to form a mixed gas, and the diversion passage 31 can divert the mixed gas.

[0055] As Figure 1 shown, in some embodiments, at least a part of the heating plate 2 is thermally connected to at least a part of the diversion portion 3.

[0056] At least a part of the heating plate 2 being thermally connected to at least a part of the diversion portion 3 enables the heating plate 2 to heat the gas within the diversion passage 31, thereby further avoiding ice formation inside the pipe body 1 and further increasing the operating stability of the Venturi device 100 of the embodiments of the present application.

[0057] Combined with Figure 1 and Figure 2 shown, in some embodiments, the radial dimension of the diversion passage 31 is greater than the radial dimension of the contraction passage 12, and the radial dimension of the diversion passage 31 is less than the radial dimension of the gas passage 13. The diversion passage 31 can increase the flow stability of the mixed gas.

[0058] Combined with Figure 1 and Figure 2 shown, in some embodiments, the pipe body 1 is further provided with a second air inlet 15. The second air inlet 15 is in communication with the inlet of the contraction passage 12, and the radial dimension of the second air inlet 15 is greater than the radial dimension of the contraction passage 12.

[0059] The second air inlet 15 can store a part of the positive pressure gas, thereby making it easier for the positive pressure gas to enter the contraction passage 12.

[0060] As Figure 1 shown, in some embodiments, the Venturi device 100 further includes a gas guiding portion 4 connected to the pipe body 1. The gas guiding portion 4 is provided with a gas guiding passage 41. One end of the gas guiding passage 41 is in communication with the first air inlet 11, and the other end of the gas guiding passage 41 is in communication with the outlet of the oil-gas separator 400. The gas guiding portion 4 is provided with a gas extraction port 42 that communicates with the gas guiding passage 41, and the gas extraction port 42 houses a hydrogen concentration sensor (not shown in the figure).

[0061] The other end of the gas guiding passage 41 and the outlet of the oil-gas separator 400 can be directly in communication, or the other end of the gas guiding passage 41 can be indirectly in communication with the outlet of the oil-gas separator 400 through other media.

[0062] The blow-by gas discharged from the oil-gas separator 400 enters the gas guiding passage 41. The oil-gas separator 400 can separate the oil and gas in the blow-by gas. The oil and gas concentration in the blow-by gas in the gas guiding passage 41 is relatively low, which can increase the service life of the hydrogen concentration sensor. Moreover, since the oil and gas concentration in the blow-by gas in the gas guiding passage 41 is relatively low, the measurement accuracy of the hydrogen concentration sensor can also be increased.

[0063] As Figure 1 shown, in some embodiments, the venturi device 100 further includes a rubber tube 5. The first end of the rubber tube 5 is sleeved on the gas guiding portion 4 and communicated with the gas guiding passage 41. The rubber tube 5 is communicated with the outlet of the oil-gas separator 400.

[0064] By providing the rubber tube 5, the probability of generating static electricity can be reduced, thereby reducing the probability of hydrogen being ignited, and further increasing the safety of the venturi device 100 in this embodiment.

[0065] As Figure 1 shown, in some embodiments, the second end of the rubber tube 5 is provided with a quick connector 51 and a diagnostic plug-in 52. The quick connector 51 is plugged into the oil-gas separator 400, and the diagnostic plug-in 52 is configured to conduct the diagnostic circuit after being plugged in.

[0066] The rubber tube 5 can be installed more quickly through the quick connector 51. The diagnostic plug-in 52 can conduct the diagnostic circuit after being plugged in, so as to diagnose whether the rubber tube 5 is installed.

[0067] As Figure 1 shown, in some embodiments, the venturi device 100 further includes an anti-abrasion sheath 6. The anti-abrasion sheath 6 is sleeved on the rubber tube 5.

[0068] The anti-abrasion sheath 6 can protect the rubber tube 5 to reduce the abrasion of the rubber tube 5.

[0069] As Figure 1 shown, in some embodiments, the outer peripheral wall of the pipe body 1 is provided with a quick connection structure 16 which is suitable for being plugged. Through the quick connection structure 16, the pipe body 1 is convenient to install.

[0070] The vehicle according to the embodiment of the present application includes a hydrogen internal combustion engine and the hydrogen internal combustion engine crankcase ventilation system 500 as described in the above embodiment. The hydrogen internal combustion engine includes a combustion chamber. The air outlet 14 of the pipe body 1 is communicated with the inlet of the combustion chamber 200.

[0071] The vehicle according to the embodiment of the present application includes the hydrogen internal combustion engine crankcase ventilation system 500 as described in the above embodiment. A negative pressure can be maintained in the crankcase 300, so that the vehicle has relatively high safety.

[0072] As described above, it is only the preferred specific implementation manner of the present application. However, the protection scope of the present application is not limited thereto. Any changes or substitutions that can be easily thought of by those skilled in the art within the technical scope disclosed in the present application should be covered within the protection scope of the present application. Therefore, the protection scope of the present application shall be subject to the protection scope of the claims.

Claims

1. A crankcase ventilation system for a hydrogen internal combustion engine, the hydrogen internal combustion engine comprising a combustion chamber, characterized in that, Comprising: A crankcase; An oil-gas separator, the inlet of which is communicated with the outlet of the crankcase, for separating blow-by gas from the crankcase; A Venturi device, the Venturi device includes a pipe body, the pipe body is provided with a first air inlet, a contraction channel, a gas channel and an air outlet, the contraction channel is used for introducing positive pressure gas, the radial dimension of the contraction channel is smaller than the radial dimension of the gas channel, the outlet of the contraction channel is communicated with the gas channel, one end of the first air inlet is communicated with the outlet of the oil-gas separator for introducing separated blow-by gas, the other end of the first air inlet is communicated with the gas channel, the gas channel is communicated with one end of the air outlet, and the air outlet is communicated with the inlet of the combustion chamber.

2. The crankcase ventilation system of a hydrogen internal combustion engine according to claim 1, characterized in that, The Venturi device further includes a heating plate, at least part of the heating plate forms the side wall of the gas channel and is located at one end of the gas channel close to the contraction channel.

3. The crankcase ventilation system of a hydrogen internal combustion engine according to claim 2, characterized in that The Venturi device includes a diversion part connected to the pipe body, the diversion part is located in the gas channel, the diversion part defines a diversion channel penetrating through the diversion part, the outlet of the contraction channel and the first air inlet are both communicated with the inlet of the diversion channel, and the outlet of the diversion channel is communicated with the gas channel.

4. The crankcase ventilation system of a hydrogen internal combustion engine according to claim 3, characterized in that, The radial dimension of the diversion channel is larger than the radial dimension of the contraction channel, and the radial dimension of the diversion channel is smaller than the radial dimension of the gas channel.

5. The crankcase ventilation system of a hydrogen internal combustion engine according to claim 3, characterized in that, At least part of the heating plate is thermally connected to at least part of the diversion part.

6. The crankcase ventilation system of a hydrogen internal combustion engine according to claim 1, characterized in that The Venturi device further includes a gas guiding part connected to the pipe body, the gas guiding part is provided with a gas guiding channel, one end of the gas guiding channel is communicated with the first air inlet, the other end of the gas guiding channel is communicated with the outlet of the oil-gas separator, the gas guiding part is provided with an air extraction port communicated with the gas guiding channel, and a hydrogen concentration sensor is accommodated in the air extraction port.

7. The crankcase ventilation system of a hydrogen internal combustion engine according to claim 6, characterized in that, The Venturi device further includes a rubber tube, the first end of the rubber tube is sleeved on the gas guiding part and is communicated with the gas guiding channel, and the rubber tube is communicated with the outlet of the oil-gas separator.

8. The crankcase ventilation system of a hydrogen internal combustion engine according to claim 7, characterized in that, The second end of the rubber tube is provided with a quick connector and a diagnostic plug-in, the quick connector is inserted into the oil-gas separator, and the diagnostic plug-in is configured to conduct a diagnostic circuit after being inserted, and / or, The Venturi device further includes an anti-abrasion sheath, and the anti-abrasion sheath is sleeved on the rubber tube.

9. The crankcase ventilation system of a hydrogen internal combustion engine according to claim 1, characterized in that, The outer peripheral wall of the pipe body is provided with a quick-insertion structure, and the quick-insertion structure is suitable for being inserted; and / or, The pipe body is further provided with a second air inlet, the second air inlet is communicated with the inlet of the contraction channel, and the radial dimension of the second air inlet is larger than the radial dimension of the contraction channel.

10. A vehicle, characterized in that, Comprising: A hydrogen internal combustion engine, including a combustion chamber; The hydrogen internal combustion engine crankcase ventilation system according to any one of claims 1 to 9, wherein the air outlet of the pipe body is communicated with the inlet of the combustion chamber.

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