Crankcase closed ventilation system and vehicle with same
By inserting a pressure release section in the ventilation duct of the crankcase closed ventilation system, the problems of ventilation duct blockage and increased internal pressure caused by the icing of oil and gas mixture in cold weather are solved, and the key to effective reduction of internal pressure and protection is achieved Safety of components.
Patent Information
- Application Number
- CN202421291255.3
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-06-06
- Publication Date
- 2025-02-18
- Estimated Expiration
- 2034-06-06
AI Technical Summary
In cold weather, the oil and gas mixture freezes in the crankcase closed ventilation system, causing the ventilation duct to be blocked, which in turn causes the internal pressure of the engine body to rise, which may cause structural rupture and major damage.
A closed-type crankcase ventilation system is designed, in which the ventilation duct is built-in pressure release section. When the internal pressure of the engine body reaches a certain value, the pressure release section releases pressure, reducing the structural strength of the ventilation duct, making it a pressure release. Safety valves protect other key components.
Through the design of the pressure release section, the internal pressure of the crankcase is effectively reduced, the internal overpressure of the engine body is prevented, the negative impact on other important components is reduced, and the safety of the system is improved.
Smart Images
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Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of engines, in particular to a crankcase closed ventilation system and a vehicle with the same. Background Art
[0002] In the crankcase closed ventilation system in the related art, during the operation of the engine body, the high-pressure unburned mixed gas and burned exhaust gas inside it will inevitably enter its internal structure, and the oil and gas naturally volatilized by the engine oil will increase the pressure inside the engine body, so the engine body needs to be exhausted to the outside. In cold weather, the oil-water mixture condensed in the oil-gas separator will slowly flow back to the bottom of the engine body, and the mixture will gradually freeze. Once this position is blocked, the frozen area will gradually expand upward until the crankcase ventilation pipe is completely blocked, the internal ventilation function of the engine body fails, and the internal exhaust gas cannot be discharged, so the internal structure of the engine body is broken, causing greater damage. Utility Model Content
[0003] The utility model aims to solve at least one of the technical problems existing in the prior art. To this end, one purpose of the utility model is to provide a crankcase closed ventilation system, which can increase the safety of other more important components by weakening the structural strength of the ventilation pipeline itself.
[0004] The utility model also provides a vehicle with a crankcase closed ventilation system.
[0005] To achieve the above-mentioned purpose, according to an embodiment of the utility model, a closed crankcase ventilation system is proposed, comprising: a turbocharger, wherein the turbocharger has a compressor; an engine body, wherein the engine body has an engine air intake and a crankcase ventilation port, wherein the compressor is connected to the engine air intake via an air intake line, and the crankcase ventilation port is connected to the compressor via a ventilation line, so that the turbocharger and the engine body form a circulation passage; an oil-gas separator, wherein the oil-gas separator is connected to the ventilation line to separate oil and gas, and an oil return line is connected between the oil-gas separator and the engine body; wherein the ventilation line is constructed with a pressure release section, and the pressure release section releases the pressure when the pressure in the ventilation line reaches a preset pressure.
[0006] According to the crankcase closed ventilation system of the embodiment of the utility model, in cold weather, the oil-gas mixture will flow back to the engine body through the ventilation line and the oil return line after passing through the oil-gas separator. In the process of gradual freezing of the oil-gas mixture, the freezing area will gradually expand upward from the bottom of the engine body until the ventilation line is completely blocked. Since the ventilation line is internally constructed with a pressure release section, when the pressure value inside the engine body reaches 4.9kpa, the engine body will first alarm to inform the user that the internal pressure of the engine body is high and needs to be repaired. If it is not repaired in time, when the pressure inside the engine body is greater than 8kpa, the pressure release section will release the pressure, and the ventilation line will rupture under the high-pressure working environment, effectively reducing the internal pressure of the crankcase, preventing the engine body from overpressure, and reducing the negative impact on other important components. By weakening the structural strength of the ventilation line itself, it becomes a safety valve for pressure release of the crankcase closed ventilation system, which plays a role in protecting other key components.
[0007] Therefore, according to the crankcase closed ventilation system 1 of the embodiment of the utility model, the safety of other more important components can be increased through the structural strength of the ventilation pipeline itself.
[0008] According to some specific embodiments of the present utility model, the engine body includes: an oil pan, which is located at the bottom of the engine; a crankcase, which is installed above the oil pan, the bottom of the crankcase is sealed with the oil pan, and the engine exhaust port is formed in the crankcase; and a cylinder block, which is installed above the crankcase, and the top of the crankcase is sealed with the cylinder block.
[0009] According to some specific embodiments of the present utility model, the oil pan is a plastic part.
[0010] According to some specific embodiments of the utility model, the ventilation pipeline includes: an oil-gas mixing section, one end of which is connected to the crankcase ventilation port, and the other end is connected to the oil-gas separator; an exhaust section, one end of which is connected to the oil-gas separator, and the other end is connected to the compressor; wherein the oil-gas mixing section is constructed with the pressure release section.
[0011] According to some specific embodiments of the present utility model, the oil-gas mixing section is a rubber tube.
[0012] According to some specific embodiments of the present invention, the thickness of the oil-gas mixing section at the pressure release section is smaller than the thickness of the remaining parts.
[0013] According to some specific embodiments of the utility model, the outer peripheral wall of the oil-gas mixing section is flush, the diameter of the oil-gas mixing section at the pressure release section is larger than the diameter at other positions, and chamfered portions are configured at both ends of the pressure release section.
[0014] According to some specific embodiments of the present invention, the inner diameter of the pressure release section is d3, the outer diameter of the oil-gas mixing section is d2, and the inner diameter of the oil-gas mixing section outside the pressure release section is d1; wherein d3>1 / 2(d1+d2).
[0015] According to some specific embodiments of the present utility model, the pressure release section is arranged adjacent to the oil pan.
[0016] According to an embodiment of the second aspect of the utility model, a vehicle is provided, comprising a crankcase closed ventilation system according to the above embodiment of the utility model.
[0017] According to the vehicle of the embodiment of the utility model, by utilizing the crankcase closed ventilation system according to the embodiment of the utility model, the safety of other more important components can be increased by weakening the structural strength of the ventilation pipeline itself.
[0018] Additional aspects and advantages of the present invention will be given in part in the following description, and in part will become apparent from the following description, or will be learned through the practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS
[0019] The above and / or additional aspects and advantages of the present invention will become apparent and easily understood from the description of the embodiments in conjunction with the following drawings, in which:
[0020] Figure 1 is a schematic diagram of a crankcase closed ventilation system according to an embodiment of the utility model;
[0021] Figure 2 It is a structural schematic diagram of the pressure release section of the crankcase closed ventilation system according to an embodiment of the utility model.
[0022] Reference numerals:
[0023] Crankcase closed ventilation system 1, turbocharger 100, engine body 200, oil-gas separator 300,
[0024] Compressor 110, turbine 120, oil pan 210, crankcase 220, cylinder block 230,
[0025] The ventilation pipeline 310 , the oil return pipeline 320 , the pressure release section 301 , the oil-gas mixing section 311 , and the exhaust section 312 . DETAILED DESCRIPTION
[0026] The embodiments of the present invention are described in detail below, and examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and cannot be understood as limiting the present invention.
[0027] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "axial", "radial", "circumferential" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.
[0028] In the description of the present invention, "first feature" or "second feature" may include one or more of the features.
[0029] In the description of the present invention, "multiple" means two or more, and "several" means one or more.
[0030] The following describes a closed crankcase ventilation system 1 according to an embodiment of the present utility model with reference to the accompanying drawings.
[0031] like Figure 1 and Figure 2 As shown, the crankcase closed ventilation system 1 according to the embodiment of the utility model includes a turbocharger 100 , an engine body 200 and an oil-gas separator 300 .
[0032] The turbocharger 100 has a compressor 110. The engine body 200 has an engine air intake and a crankcase vent. The compressor 110 is connected to the engine air intake through an air intake pipeline, and the crankcase vent is connected to the compressor 110 through a ventilation pipeline 310, so that the turbocharger 100 and the engine body 200 form a circulation passage. The oil-gas separator 300 is connected to the ventilation pipeline 310 to separate oil and gas, and an oil return pipeline 320 is connected between the oil-gas separator 300 and the engine body 200. Among them, the ventilation pipeline 310 is configured with a pressure release section 301, and the pressure release section 301 releases the pressure when the pressure in the ventilation pipeline 310 reaches a preset pressure.
[0033] For example, during the operation of the vehicle, the outside air will be compressed by the compressor 110 and then enter the engine body 200. After being burned in the engine body 200, the oil-gas mixture will enter the oil-gas separator 300 through the ventilation line 310. After a series of operations, the separated oil in the mixture will re-enter the engine body 200 through the oil return line 320, and the remaining gas in the mixture will re-enter the turbocharger 100 through the ventilation line 310, and will be discharged to the outside space after its internal operation.
[0034] According to the crankcase closed ventilation system 1 of the embodiment of the utility model, in cold weather, the oil-gas mixture will flow back to the engine body 200 through the ventilation line 310 and the oil return line 320 after passing through the oil-gas separator 300. In the process of gradual freezing of the oil-gas mixture, the freezing area will gradually expand upward from the bottom of the engine body 200 until the ventilation line 310 is completely blocked. Since the ventilation line 310 is internally constructed with a pressure release section 301, when the pressure value inside the engine body 200 reaches 4.9kpa, the engine body 200 will first alarm to inform the user that the internal pressure of the engine body 200 is high and needs to be repaired. If the repair is not carried out in time, when the pressure inside the engine body 200 is greater than 8kpa, the pressure release section 301 will release the pressure, and the ventilation line 310 will rupture under the high-pressure working environment, effectively reducing the internal pressure of the crankcase closed ventilation system 1, preventing the engine body 200 from overpressure, and reducing the negative impact on other important components. By weakening the structural strength of the ventilation line 310 itself, it becomes a safety valve for releasing the pressure of the crankcase closed ventilation system 1, thereby protecting other key components.
[0035] Therefore, according to the crankcase closed ventilation system 1 of the embodiment of the utility model, the safety of other more important components can be increased by weakening the structural strength of the oil return pipeline itself.
[0036] In some specific embodiments of the present invention, Figure 1 As shown, the engine body 200 includes an oil pan 210, a crankcase 220 and a cylinder block 230. The oil pan 210 is located at the bottom of the engine body 200. The crankcase 220 is mounted above the oil pan 210, the bottom of the crankcase 220 is sealed with the oil pan 210, and the engine exhaust port is formed in the crankcase 220. The cylinder block 230 is mounted above the crankcase 220, and the top of the crankcase 220 is sealed with the cylinder block 230.
[0037] The engine exhaust port is set in or near the crankcase 220. After the oil-gas mixture is discharged from the cylinder block 230, it is gathered to the turbine 120 of the turbocharger 100 after passing through the exhaust pipe, and the kinetic energy of the oil-gas mixture is used to drive the turbine 120 to rotate. The turbine 120 is coaxially connected to the compressor 110 on the intake side. When the turbine 120 rotates, the compressor 110 also rotates, thereby compressing the external air and sending it into the cylinder block 230, thereby improving the intake density and the combustion efficiency of the engine.
[0038] In some specific embodiments of the present invention, the oil pan 210 is a plastic part. Plastic parts are lighter than metal materials, and the use of plastic parts can effectively reduce the total weight of the engine body 300. Reducing the weight of the engine body 300 helps to improve the fuel economy and performance of the vehicle, reduce energy consumption and emissions, and help improve the performance of suspension and handling. At the same time, plastic parts are not easily affected by corrosion and rust, which is a clear advantage for the oil pan 210 that is in contact with lubricating oil and possible moisture for a long time, and can extend the service life of the engine body 300.
[0039] In some specific embodiments of the present invention, Figure 1 As shown, the ventilation line 310 includes an oil-gas mixing section 311 and an exhaust section 312. One end of the oil-gas mixing section 311 is connected to the crankcase vent, and the other end is connected to the oil-gas separator 300. One end of the exhaust section 312 is connected to the oil-gas separator 300, and the other end is connected to the compressor 110. The oil-gas mixing section 311 is configured with a pressure release section 301. The oil-gas mixing section 311 connects the crankcase vent and the oil-gas separator 300, and the oil-gas mixture in the crankcase 320 can be transported to the oil-gas separator 300 through the oil-gas mixing section 311. The oil-gas separator 300 can effectively separate the gas from the lubricating oil, and can also recover and recycle the lubricating oil, thereby improving the fuel economy and environmental protection of the engine.
[0040] The exhaust section 312 connects the oil-gas separator 300 and the compressor 110, and the separated oil-gas mixture is discharged into the compressor 110 through the exhaust section 312. The exhaust function helps to maintain the normal operation of the compressor 110, avoid exhaust gas blockage or affect the working efficiency of the crankcase closed ventilation system 1, and ensure the normal output power of the crankcase closed ventilation system 1.
[0041] In some specific embodiments of the utility model, the oil-gas mixing section 311 is a rubber tube. The rubber tube has good flexibility and elasticity, and can better adapt to the vibration and deformation of the engine body 300 during operation, thereby reducing the transmission of vibration to the ventilation pipeline 310. Its shock absorption can also reduce the impact of vibration generated by the operation of the engine body 300 on the ventilation pipeline 310, which helps to protect the pipeline and connectors and extend their service life.
[0042] Meanwhile, the rubber material generally has good oil resistance, and can effectively resist the erosion of the lubricating oil and other liquids flowing in the oil-gas mixing section 311. In addition, the rubber pipeline also has a certain wear resistance, and can maintain good stability and durability when subjected to oil return impact and friction in the crankcase closed ventilation system 1. In addition, the rubber pipeline has good sealing performance, and can effectively prevent the leakage of lubricating oil or other liquids, and maintain the sealing of the crankcase closed ventilation system 1.
[0043] In some specific embodiments of the present invention, Figure 2 As shown, the thickness of the oil-gas mixing section 311 at the pressure release section 301 is smaller than the thickness of the rest of the section. The smaller thickness at the pressure release section 301 can achieve the regulation of the internal pressure of the crankcase closed ventilation system 1 to a certain extent. When the pressure at the oil pan 310 inside the engine body 300 gradually increases due to the freezing of the oil-gas mixture due to the cold weather, the pressure release section 301 is smaller and can withstand less pressure. When the pressure inside the engine body 300 is greater than its maximum value, the pressure release section 301 is easier to break due to its smaller thickness, thereby protecting the safety of the rest of the crankcase closed ventilation system 1 and improving the economy of the whole vehicle.
[0044] In some specific embodiments of the present invention, Figure 2 As shown, the outer peripheral wall of the oil-gas mixing section 311 is flush, the diameter of the oil-gas mixing section 311 at the pressure release section 301 is larger than the diameter at other positions, and chamfered portions are configured at both ends of the pressure release section 301. The chamfered portion can achieve a smooth transition of the inner diameter of the oil-gas mixing section 311, avoiding a sharp radial change or angle change, and the chamfered structure can also play a certain strengthening role, especially when subjected to external pressure or vibration, it can disperse stress and reduce stress concentration, thereby improving the fatigue resistance and overall durability of the pressure release section 301.
[0045] In some specific embodiments of the present invention, Figure 2 As shown, the inner diameter of the pressure release section 301 is d3, the outer diameter of the oil-gas mixing section 311 is d2, and the inner diameter of the oil-gas mixing section 311 outside the pressure release section 301 is d1. Among them, d3>1 / 2(d1+d2). By setting d3>1 / 2(d1+d2), when the crankcase closed ventilation system 1 reaches a certain load exceeding the design pressure, the pressure release section 301 is the part that is most likely to rupture first. Such a structure can protect other components and reduce more serious damage or danger caused by excessive pressure in the crankcase closed ventilation system 1.
[0046] In some specific embodiments of the present invention, Figure 2As shown, the pressure release section is arranged adjacent to the oil pan. Placing the pressure release section 301 close to the end of the oil pan 310 can reduce the pressure loss in the oil-gas mixing section 311. By placing the pressure release section 301 close to the end of the oil pan 310 at the shortest possible distance, the flow resistance of the fluid or gas in the pipeline can be reduced, and the energy loss of the system can be reduced, which is beneficial to improving the efficiency of the crankcase closed ventilation system 1 and has important significance for the dynamic performance and output response of the crankcase closed ventilation system 1. If the distance is longer, there will be a pressure difference between the pressure at the pressure release section 301 and the end of the oil pan 310. When the pressure inside the oil pan 310 changes, the pressure release section 301 can respond in time, which increases the safety and reliability of the oil pan 310.
[0047] A vehicle according to an embodiment of the present invention is described below.
[0048] The vehicle according to the embodiment of the utility model comprises the crankcase closed ventilation system 1 according to the above embodiment of the utility model.
[0049] According to the vehicle of the above embodiment of the utility model, by utilizing the crankcase closed ventilation system 1 according to the embodiment of the utility model, the safety of other more important components can be increased by weakening the structural strength of the oil return pipeline itself.
[0050] Other structures and operations according to the embodiments of the present invention are known to those skilled in the art and will not be described in detail here.
[0051] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "illustrative embodiments", "examples", "specific examples", or "some examples" means that the specific features, structures, materials, or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the utility model. In this specification, the schematic expressions of the above terms do not necessarily refer to the same embodiment or example.
[0052] Although the embodiments of the present invention have been shown and described, those skilled in the art will appreciate that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the claims and their equivalents.
Claims
1. A crankcase closed ventilation system, characterized in that: include: A turbocharger having a compressor; An engine body, the engine body having an engine air intake and a crankcase vent, the compressor being connected to the engine air intake via an air intake pipeline, and the crankcase vent being connected to the compressor via a ventilation pipeline, so that the turbocharger and the engine body form a circulation passage; An oil-gas separator, the oil-gas separator is connected to the ventilation pipeline to separate oil and gas, and an oil return pipeline is connected between the oil-gas separator and the engine body; Wherein, the ventilation pipeline is configured with a pressure release section, and the pressure release section releases the pressure when the pressure in the ventilation pipeline reaches a preset pressure.
2. The crankcase closed ventilation system according to claim 1, characterized in that: The engine body comprises: An oil pan, the oil pan being located at the bottom of the engine body; A crankcase, wherein the crankcase is mounted above the oil pan, the bottom of the crankcase is sealed with the oil pan, and an engine exhaust port is formed in the crankcase; A cylinder block is installed above the crankcase, and the top of the crankcase is sealed with the cylinder block.
3. The crankcase closed ventilation system according to claim 2, characterized in that: The oil pan is a plastic part.
4. The crankcase closed ventilation system according to claim 1, characterized in that: The ventilation pipeline comprises: An oil-gas mixing section, one end of which is connected to the crankcase vent, and the other end of which is connected to the oil-gas separator, and the pressure release section is formed in the oil-gas mixing section; An exhaust section, one end of which is connected to the oil-gas separator, and the other end of which is connected to the compressor.
5. The crankcase closed ventilation system according to claim 4, characterized in that: The oil-gas mixing section is a rubber tube.
6. The crankcase closed ventilation system according to claim 4, characterized in that: The thickness of the oil-gas mixing section at the pressure release section is smaller than the thickness of the remaining parts.
7. The crankcase closed ventilation system according to claim 4, characterized in that: The outer peripheral wall of the oil-gas mixing section is flush, the diameter of the oil-gas mixing section at the pressure release section is larger than the diameter at other positions, and chamfered portions are configured at both ends of the pressure release section.
8. The crankcase closed ventilation system according to claim 4, characterized in that: The inner diameter of the pressure release section is d3, the outer diameter of the oil-gas mixing section is d2, and the inner diameter of the oil-gas mixing section outside the pressure release section is d1; Among them, d3>1 / 2(d1+d2).
9. The crankcase closed ventilation system according to claim 3, characterized in that: The pressure release section is disposed adjacent to the oil pan.
10. A vehicle, characterized in that: include: A closed crankcase ventilation system according to any one of claims 1 to 9.