Crankcase ventilation system, engine and vehicle

Abstract

The utility model discloses a crankcase ventilation system, an engine and a vehicle, and relates to the technical field of crankcase ventilation, the crankcase ventilation system is applied to the engine, the engine comprises a cylinder head cover and a crankcase, and the crankcase ventilation system comprises an oil-gas separator arranged on one side of the cylinder head cover; the first pre-separation structure is arranged between the oil-gas separator and the cylinder head cover, the first pre-separation structure is provided with a gas inlet, a gas outlet and a backflow port, the gas inlet is connected with the cylinder head cover, the gas outlet is connected with the oil-gas separator, and the backflow port is connected with the crankcase. According to the technical scheme, the technical problem that an oil-gas separator in an existing crankcase ventilation system is prone to breaking down is solved.

Description

Technical Field

[0001] The utility model relates to the technical field of crankcase ventilation, in particular to a crankcase ventilation system, an engine and a vehicle. Background Art

[0002] When the engine is working, due to incomplete combustion, wear of piston rings and cylinder walls, and thermal decomposition of lubricating oil, a certain amount of gas will be generated in the crankcase, including water vapor, oil vapor, and lubricating oil vapor, etc. If these gases are not discharged in time, they will accumulate in the crankcase, causing pressure to rise, affecting the normal operation of the engine, and may accelerate the oxidation of the lubricating oil, reducing its lubrication effect.

[0003] The function of the crankcase ventilation system is to discharge the crankcase gas and remove the liquid or impurities contained in the crankcase gas through the oil-gas separator. The filtered fresh gas will return to the engine to participate in combustion, etc. However, during use, the oil-gas separator is prone to failure and has a low service life. Utility Model Content

[0004] The main purpose of the utility model is to provide a crankcase ventilation system, an engine and a vehicle, aiming to solve the technical problem that the oil-gas separator in the existing crankcase ventilation system is prone to failure.

[0005] To achieve the above-mentioned purpose, the embodiment of the utility model provides a crankcase ventilation system, which is applied to an engine. The engine includes a cylinder head cover and a crankcase. The crankcase ventilation system includes:

[0006] An oil-gas separator is disposed on one side of the cylinder head cover; and

[0007] The first pre-separation structure is arranged between the oil-gas separator and the cylinder head cover. The first pre-separation structure has an air inlet, an air outlet and a return port. The air inlet is connected to the cylinder head cover, the air outlet is connected to the oil-gas separator, and the return port is connected to the crankcase.

[0008] In one embodiment, the first pre-separation structure comprises:

[0009] an air intake pipeline, the air intake pipeline having the air intake port;

[0010] an air outlet pipeline, the air outlet pipeline having the air outlet, the air outlet pipeline being connected to the air inlet pipeline; and

[0011] A return pipeline is provided with the return port, and the return pipeline is connected to the intake pipeline.

[0012] In one embodiment, the air inlet pipeline has a bottom, a top and a side, the bottom is arranged opposite to the top, and the side connects the top and the bottom; the return pipeline is arranged at the bottom, and the air outlet pipeline is arranged at the top or the side.

[0013] In one embodiment, at least one of the air inlet pipeline, the air outlet pipeline and the return pipeline is integrated with the engine.

[0014] In one embodiment, at least one of the air inlet pipeline, the air outlet pipeline and the return pipeline is provided with a heating and heat preservation structure.

[0015] In one embodiment, the first pre-separation structure further includes a one-way valve, and the one-way valve is disposed in the return line so that the intake line is connected to the crankcase.

[0016] In one embodiment, the crankcase ventilation system further comprises a supercharger, a second pre-separation structure is provided between the supercharger and the oil-gas separator, and the oil-gas separator, the supercharger and the crankcase are all connected to the second pre-separation structure.

[0017] In one embodiment, the crankcase ventilation system further includes a third pre-separation structure, and the third pre-separation structure is disposed on the cylinder head cover.

[0018] To achieve the above objectives, an embodiment of the utility model provides an engine, wherein the engine comprises the crankcase ventilation system described above.

[0019] In one embodiment, the fuel for the engine comprises methanol.

[0020] To achieve the above objectives, an embodiment of the present utility model provides a vehicle, which includes the engine described above.

[0021] Compared with the prior art, in a technical solution proposed by the utility model, the first pre-separation structure is set up, and the tortuosity gas flowing out of the cylinder head cover first flows into the first pre-separation structure from the air inlet, and the first pre-separation structure performs preliminary filtering on the tortuosity gas flowing in, and the impurities, liquids, etc. mixed in the tortuosity gas flow into the crankcase or the oil pan from the reflux port, and the filtered clean gas flows into the oil-gas separator for further filtration, thereby achieving preliminary oil-gas separation of the tortuosity gas. Since the gas entering the oil-gas separator is the filtered clean gas, the oil-gas separation burden of the oil-gas separator is reduced, the failure rate of the oil-gas separator is reduced, and the service life of the oil-gas separator can be effectively improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on the structures shown in these drawings without paying creative work.

[0023] Figure 1 It is a structural schematic diagram of an embodiment of a crankcase ventilation system of the utility model.

[0024] Description of Figure Numbers:

[0025] 10. Oil-gas separator; 20. First pre-separation structure; 21. Intake pipe; 22. Outlet pipe; 23. Return pipe; 24. One-way valve; 30. Supercharger; 40. Second pre-separation structure; 50. Air filter; 60. Intercooler; 70. Air supply structure; 80. Cylinder head cover; 90. Crankcase.

[0026] The realization of the purpose, functional features and advantages of the utility model will be further explained in conjunction with embodiments and with reference to the accompanying drawings. DETAILED DESCRIPTION

[0027] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the embodiments of the utility model.

[0028] It should be noted that all directional indications in the embodiments of the present invention (such as up, down, left, right, front, back...) are only used to explain the relative position relationship, movement status, etc. between the components under a certain specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indication will also change accordingly.

[0029] In addition, in the embodiments of the present invention, the descriptions of "first", "second", etc. are only for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" or "second" may explicitly or implicitly include at least one of the features. In the description of the embodiments of the present invention, the meaning of "multiple" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0030] In the embodiments of the present invention, unless otherwise clearly specified and limited, the terms "connection", "fixation", etc. should be understood in a broad sense. For example, "fixation" can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in the embodiments of the present invention can be understood according to specific circumstances.

[0031] In addition, the technical solutions between the various embodiments of the present utility model can be combined with each other, but it must be based on the fact that ordinary technicians in the field can implement it. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such combination of technical solutions does not exist and is not within the scope of protection required by the embodiments of the present utility model.

[0032] The crankcase ventilation system is a vital component of the engine. Its main purpose is to process the tortuosity gas generated during the operation of the engine and remove the liquid or impurities contained in the tortuosity gas through the oil-gas separator. The filtered fresh gas will return to the engine to participate in combustion, etc. In actual use, the tortuosity gas flowing out of the crankcase directly flows to the separator. There are a lot of liquids, emulsions, impurities, etc. mixed in the tortuosity gas, which puts a great burden on the oil-gas separator. The failure rate of the oil-gas separator remains high, which is not conducive to the normal operation of the crankcase ventilation system.

[0033] In view of this, the embodiment of the utility model provides a crankcase ventilation system, an engine and a vehicle, wherein the crankshaft gas flowing out of the cylinder head cover first flows into the first pre-separation structure through the air inlet for preliminary filtration, thereby achieving preliminary oil-gas separation of the crankshaft gas. Since the gas entering the oil-gas separator is filtered clean gas, the oil-gas separation burden of the oil-gas separator is reduced, the failure rate of the oil-gas separator is reduced, and the service life of the oil-gas separator can be effectively improved.

[0034] In order to better understand the above technical solution, the above technical solution is described in detail below with reference to the accompanying drawings.

[0035] like Figure 1 As shown, the embodiment of the utility model provides a crankcase ventilation system, which is applied to an engine. The engine includes a cylinder head cover 80 and a crankcase 90. The crankcase ventilation system includes:

[0036] The oil-gas separator 10 is disposed on one side of the cylinder head cover 80; and

[0037] The first pre-separation structure 20 is arranged between the oil-gas separator 10 and the cylinder head cover 80. The first pre-separation structure 20 has an air inlet, an air outlet and a reflux port. The air inlet is connected to the cylinder head cover 80, the air outlet is connected to the oil-gas separator 10, and the reflux port is connected to the crankcase 90.

[0038] In the technical solution adopted in this embodiment, the first pre-separation structure 20 is set, and the tortuosity gas flowing out of the cylinder head cover 80 first flows into the first pre-separation structure 20 from the air inlet, and the first pre-separation structure 20 performs preliminary filtering on the tortuosity gas flowing in, and the impurities, liquids, etc. mixed in the tortuosity gas flow into the crankcase 90 or the oil pan from the reflux port, and the filtered clean gas flows into the oil-gas separator 10 for re-filtration, thereby achieving preliminary oil-gas separation of the tortuosity gas. Since the gas entering the oil-gas separator 10 is the filtered clean gas, the oil-gas separation burden of the oil-gas separator 10 is reduced, the failure rate of the oil-gas separator 10 is reduced, and the service life of the oil-gas separator 10 can be effectively improved.

[0039] In one embodiment of the present invention, the first pre-separation structure 20 includes:

[0040] An air intake pipeline 21, the air intake pipeline 21 has an air intake port;

[0041] An air outlet pipeline 22, the air outlet pipeline 22 has an air outlet, and the air outlet pipeline 22 is connected to the air inlet pipeline 21; and

[0042] The return line 23 has a return port, and the return line 23 is connected to the intake line 21 .

[0043] Specifically, the first pre-separation structure 20 includes an intake pipe 21, an outlet pipe 22 and a return pipe 23. Among them, the intake pipe 21 is used to take gas from the crankcase 90, that is, the tortuosity gas first flows into the intake pipe 21. During the flow of the tortuosity gas in the intake pipe 21, due to factors such as temperature changes or high-speed impact, impurities, liquids, etc. mixed in the tortuosity gas will settle. The impurities, liquids, etc. settled in the intake pipe 21 flow back to the crankcase 90 or the oil pan through the return pipe 23, and the filtered clean tortuosity gas flows into the oil-gas separator 10 through the outlet pipe 22 for oil-gas separation again. It can be understood that the intake pipe 21, the outlet pipe 22 and the return pipe 23 form a three-way structure, which is connected to the cylinder head cover 80, the crankcase 90 and the oil-gas separator 10 respectively, and can achieve preliminary oil-gas separation of the tortuous gas before entering the oil-gas separator 10, thereby reducing the impurities or liquids entering the oil-gas separator 10, thereby reducing the oil-gas separation burden of the oil-gas separator 10, which is beneficial to reducing the failure rate of the oil-gas separator 10.

[0044] In one embodiment, the air inlet pipeline 21, the air outlet pipeline 22 and the return pipeline 23 are integrated, which can reduce the number of parts used to connect the pipelines and make the overall structure more compact. Of course, in other embodiments, the air inlet pipeline 21, the air outlet pipeline 22 and the return pipeline 23 can also be assembled separately, which can improve the convenience of assembly and facilitate disassembly and maintenance.

[0045] In one embodiment of the utility model, the air inlet pipeline 21 has a bottom, a top and a side, the bottom is arranged opposite to the top, and the side connects the top and the bottom; the return pipeline 23 is arranged at the bottom, and the air outlet pipeline 22 is arranged at the top or the side.

[0046] Specifically, the liquid or impurities settled in the intake pipe 21 will settle to the bottom of the intake pipe 21 under the action of gravity. To this end, the return pipe 23 is connected to the bottom of the intake pipe 21, so that the settled liquid, impurities, etc. can flow smoothly from the intake pipe 21 into the return pipe 23, and finally flow back to the crankcase 90 or the oil pan. At the same time, the outlet pipe 22 is connected to the top or side of the intake pipe 21, which can prevent the liquid or impurities settled at the bottom of the intake pipe 21 from entering the outlet pipe 22, reduce the amount of liquid or impurities mixed in the tortuous gas flowing to the oil-gas separator 10, improve the oil-gas separation effect of the first pre-separation structure 20, and further reduce the failure rate of the oil-gas separator 10.

[0047] In one embodiment of the utility model, at least one of the air inlet pipeline 21, the air outlet pipeline 22 and the return pipeline 23 is integrated with the engine. The engine generates heat when it is working. The heat generated by the engine when it is working can be used to heat the gas in the pipeline, increase the temperature of the gas flowing in the pipeline, and effectively reduce the risk of emulsion formation and pipeline icing. In addition, the heat generated by the engine when it is working can be effectively used, which is more energy-saving and can also dissipate heat and cool the engine.

[0048] In one embodiment of the utility model, at least one of the air inlet pipeline 21, the air outlet pipeline 22 and the return pipeline 23 is provided with a heating and heat preservation structure. Specifically, the heating and heat preservation structure can heat the tortuosity gas in the pipeline, increase the temperature of the tortuosity gas flowing in the pipeline, and effectively reduce the risk of emulsion formation and pipeline icing. In one embodiment, the heating and heat preservation structure can be a heat preservation cotton wrapped around the outside of the pipeline, or a heating coil arranged outside the pipeline, etc., which is not limited here.

[0049] In an embodiment of the utility model, the first pre-separation structure 20 further includes a one-way valve 24, which is arranged on the return line 23, so that the direction from the intake line 21 to the crankcase 90 is open. In this way, the gas or liquid in the crankcase 90 can be prevented from flowing to the outlet line 22 through the return line 23, further reducing the oil-gas separation burden of the oil-gas separator 10 and reducing the failure rate of the oil-gas separator 10.

[0050] In one embodiment of the utility model, the crankcase ventilation system further includes a supercharger 30, a second pre-separation structure 40 is provided between the supercharger 30 and the oil-gas separator 10, and the oil-gas separator 10, the supercharger 30 and the crankcase 90 are all connected to the second pre-separation structure 40. In this embodiment, the second pre-separation structure 40 can filter the tortuosity gas filtered by the oil-gas separator 10 again, reduce the liquid or impurities mixed in the tortuosity gas flowing to the supercharger 30, improve the cleanliness of the tortuosity gas flowing into the supercharger 30, reduce the burden of the supercharger 30, and thus reduce the failure rate of the supercharger 30. As an optional method, the second pre-separation structure 40 has the same structure as the first pre-separation structure 20, which is not limited here.

[0051] In one embodiment of the utility model, the crankcase ventilation system further includes a third pre-separation structure, which is disposed on the cylinder head cover 80. In this way, the first oil-gas separation of the crankshaft gas can be achieved through the third pre-separation structure, thereby improving the cleanliness of the crankshaft gas flowing to the oil-gas separator 10. In one embodiment, the third pre-separation structure is integrated in the cylinder head cover 80, and the oil-gas separation can be performed by using the currently commonly used porous baffles and oil-gas chamber separation, which are not limited here.

[0052] In one embodiment, the crankcase ventilation system further includes an air filter 50 , which is connected to the supercharger 30 to provide fresh air to the supercharger 30 .

[0053] In other embodiments, the crankcase ventilation system also includes an intercooler 60, which is connected to the supercharger 30 and the intake manifold. The intake manifold is connected to the cylinder head cover 80, and can replenish fresh air to the cylinder head cover 80, thereby reducing the temperature of the supercharged air, thereby reducing the heat load of the methanol engine, increasing the intake volume, and then increasing the power of the methanol engine.

[0054] In another embodiment, the crankcase ventilation system further includes an air supply structure 70 , which is connected to the cylinder head cover 80 , and can prevent the exhaust gas from forming a dead zone in the cylinder head cover 80 , thereby reducing the risk of emulsion generation or deposition in the cylinder head cover 80 .

[0055] To achieve the above purpose, the embodiment of the utility model provides an engine, which includes the crankcase ventilation system described above. Specifically, the specific structure of the crankcase ventilation system refers to the above embodiment. Since the engine adopts all the technical solutions of the above embodiment, it at least has all the beneficial effects brought by the technical solutions of the above embodiment, which will not be described one by one here.

[0056] In one embodiment of the utility model, the fuel of the engine includes methanol. Since the exhaust gas of the combustion product of fuels such as methanol contains a lot of water, and in a low temperature environment or low temperature working conditions, the water vapor in the exhaust gas is easy to condense, and it is mixed with the unburned methanol and other fuels and lubricating oil to cause local emulsification. For this reason, it is easy to cause more liquids and impurities in the crankcase gas, which greatly increases the oil-gas separation burden of the oil-gas separator. Therefore, the crankcase ventilation system proposed in the embodiment of the present application is particularly suitable for methanol engines, and can perform preliminary oil-gas separation on the crankcase gas before the oil-gas separator, reducing the oil-gas separation burden of the oil-gas separator, and thus reducing the failure rate of the oil-gas separator.

[0057] To achieve the above purpose, the embodiment of the utility model provides a vehicle, which includes the engine described above. Specifically, the specific structure of the engine refers to the above embodiment. Since the vehicle adopts all the technical solutions of the above embodiment, it at least has all the beneficial effects brought by the technical solutions of the above embodiment, which will not be described one by one here.

[0058] The above description is only an exemplary implementation of the present invention, and does not limit the patent scope of the embodiments of the present invention. All equivalent structural changes made by using the description and drawings of the embodiments of the present invention under the technical concept of the present invention, or directly / indirectly applied in other related technical fields are included in the patent protection scope of the embodiments of the present invention.

Claims

1. A crankcase ventilation system, applied to an engine, the engine comprising a cylinder head cover and a crankcase, characterized in that: The crankcase ventilation system comprises: An oil-gas separator is disposed on one side of the cylinder head cover; and The first pre-separation structure is arranged between the oil-gas separator and the cylinder head cover. The first pre-separation structure has an air inlet, an air outlet and a return port. The air inlet is connected to the cylinder head cover, the air outlet is connected to the oil-gas separator, and the return port is connected to the crankcase.

2. The crankcase ventilation system according to claim 1, characterized in that The first pre-separation structure comprises: an air intake pipeline, the air intake pipeline having the air intake port; an air outlet pipeline, the air outlet pipeline having the air outlet, the air outlet pipeline being connected to the air inlet pipeline; and A return pipeline is provided with the return port, and the return pipeline is connected to the intake pipeline.

3. The crankcase ventilation system according to claim 2, characterized in that The air inlet pipeline has a bottom, a top and a side, the bottom is arranged opposite to the top, and the side connects the top and the bottom; the return pipeline is arranged at the bottom, and the air outlet pipeline is arranged at the top or the side.

4. The crankcase ventilation system according to claim 2, characterized in that At least one of the air inlet pipeline, the air outlet pipeline and the return pipeline is integrated with the engine.

5. The crankcase ventilation system according to claim 2, characterized in that At least one of the air inlet pipeline, the air outlet pipeline and the return pipeline is provided with a heating and heat preservation structure.

6. The crankcase ventilation system of claim 2, wherein: The first pre-separation structure further includes a one-way valve, which is disposed on the return line so as to allow the intake line to be connected to the crankcase.

7. The crankcase ventilation system of claim 1, wherein: The crankcase ventilation system further comprises a supercharger, a second pre-separation structure is provided between the supercharger and the oil-gas separator, and the oil-gas separator, the supercharger and the crankcase are all connected to the second pre-separation structure.

8. The crankcase ventilation system according to any one of claims 1 to 7, characterized in that The crankcase ventilation system further includes a third pre-separation structure, and the third pre-separation structure is disposed on the cylinder head cover.

9. An engine, characterized in that: The engine comprises a crankcase ventilation system according to any one of claims 1 to 8.

10. The engine according to claim 9, characterized in that The fuel for the engine includes methanol.

11. A vehicle, characterized in that: The vehicle comprises an engine as claimed in any one of claims 9 to 10.

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