Crankcase ventilation system and automobile

Abstract

The utility model discloses a crankcase ventilation system and an automobile, the crankcase ventilation system comprises a curved through pipe assembly and an oil-gas separator, the oil-gas separator is provided with a low-pressure channel, the curved through pipe assembly comprises a double-layer curved through pipe, the double-layer curved through pipe comprises an outer pipe and an inner pipe, an outer-layer channel is defined between the inner wall of the outer pipe and the outer wall of the inner pipe, and the outer-layer channel is communicated with the outer-layer channel. An inner layer channel is defined by the inner wall of the inner pipe; one end of the first connector is connected with one end of the double-layer bent through pipe, the other end of the first connector is connected with the oil-gas separator, and the first connector is configured to communicate the outer-layer channel with the low-pressure channel of the oil-gas separator so that the outer-layer channel can be in a low-negative-pressure state. According to the application, when the double-layer bent through pipe cracks and leaks, as the outer-layer channel is negative pressure relative to the atmospheric pressure, only external gas can be sucked into the pipe, abnormity is monitored, pollutants containing oil gas in the pipe cannot leak to the external environment, and the environment is prevented from being polluted.

Description

Technical Field

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

[0002] With the improvement of global environmental awareness and the increasingly stringent emission standards for motor vehicles, higher requirements are placed on automobile exhaust emission control. For vehicles equipped with a crankcase ventilation system (Positive Crankcase Ventilation System, PCV system for short), manufacturers must continuously monitor the integrity of the PCV system to ensure its normal operation. Currently, a conductive metal tube solution is usually used for monitoring. The conductive metal tube solution monitors the on-off of the pipeline by the on-off current after the pipeline is disconnected. This method can only determine whether the interface has fallen off, but cannot identify the most common leakage caused by aging and cracking of the crankcase pipe or puncture by sharp objects, resulting in pollutants leaking to the outside and environmental pollution. Utility Model Content

[0003] The embodiments of the utility model provide a crankcase ventilation system and a car, aiming to solve the problem that the existing crankshaft pipe is aged and cracked or punctured by sharp objects and cannot be identified in time, resulting in the leakage of pollutants and the pollution of the environment.

[0004] In a first aspect, the utility model provides a crankcase ventilation system, including a torpedo tube assembly and an oil-gas separator, wherein the oil-gas separator has a low-pressure passage, and the torpedo tube assembly includes:

[0005] A double-layer curved tube, comprising an outer tube and an inner tube, wherein an outer layer channel is defined between the inner wall of the outer tube and the outer wall of the inner tube, and an inner layer channel is defined by the inner wall of the inner tube;

[0006] A first joint, one end of which is connected to one end of the double-layer curved tube and the other end of which is connected to the oil-gas separator. The first joint is configured to connect the outer channel and the low-pressure channel of the oil-gas separator so that the outer channel is in a low negative pressure state.

[0007] Further, the oil-gas separator has a high-pressure channel, the first joint includes a first outer pipe joint and a first inner pipe joint, the first inner pipe joint is installed in the first outer pipe joint, the first outer pipe joint is connected to the outer pipe, the first inner pipe joint is connected to the inner pipe, an outer connecting channel is defined between the outer wall of the first inner pipe joint and the inner wall of the first outer pipe joint, and an inner connecting channel is defined by the inner wall of the first inner pipe joint; wherein, the outer connecting channel connects the outer layer channel and the low-pressure channel, and the inner connecting channel connects the inner layer channel and the high-pressure channel.

[0008] Furthermore, the bent tube assembly also includes a first inner tube seal, which is sleeved between the outer wall of the first inner tube joint and the inner wall of the high-pressure channel, or between the inner wall of the first inner tube joint and the outer wall of the high-pressure channel.

[0009] Furthermore, the curved tube assembly also includes a first outer tube seal, which is sleeved between the outer wall of the first outer tube joint and the inner wall of the low-pressure channel, or between the inner wall of the first outer tube joint and the outer wall of the low-pressure channel.

[0010] Furthermore, the outer wall of the first outer tube joint is provided with a first outer insertion portion, the inner wall of the first outer tube joint is provided with a first inner insertion portion, the first inner insertion portion is plugged into the outer tube, and the first outer insertion portion is plugged into the low-pressure channel.

[0011] Furthermore, the crankcase ventilation system also includes an intake pipe, and the curved tube assembly also includes a second joint, one end of the second joint is connected to the intake pipe, and the other end of the second joint is connected to the other end of the double-layer curved tube.

[0012] Furthermore, the air inlet pipe includes an outer air pipe and an inner air pipe, the second joint includes a second inner pipe joint and a sealing plug arranged on the outer wall of the second inner pipe joint, the two ends of the second inner pipe joint are respectively connected to the inner air pipe and the inner pipe, and the two ends of the sealing plug are respectively interference fit with the outer air pipe and the outer pipe.

[0013] Furthermore, the curved tube assembly also includes a second inner tube seal, which is sleeved between the outer wall of the second inner tube joint and the inner wall of the inner air pipe, or the second inner tube seal is sleeved between the inner wall of the second inner tube joint and the outer wall of the inner air pipe.

[0014] Furthermore, an outer ring shoulder is provided on the outer wall ring of the sealing plug, and the outer ring shoulder divides the sealing plug into a front plug and a rear plug along the axial direction of the sealing plug, the front plug is interference fit with the external air pipe, and the end of the external air pipe is abutted against the outer ring shoulder, and the rear plug is interference fit with the outer pipe.

[0015] In a second aspect, the utility model further provides an automobile, comprising the crankcase ventilation system of the first aspect.

[0016] The utility model provides a crankcase ventilation system and a car. The crankcase ventilation system comprises a torsion pipe assembly and an oil-gas separator. The oil-gas separator has a low-pressure passage. The torsion pipe assembly comprises a double-layer torsion pipe and a first joint. The double-layer torsion pipe comprises an outer pipe and an inner pipe. The outer pipe and the inner pipe are provided with an outer layer passage, and the inner pipe is provided with an inner layer passage. The outer layer passage is connected with the low-pressure passage of the oil-gas separator through the first joint, so that the outer layer passage is in a low negative pressure state. If the double-layer torsion pipe cracks and leaks, since the outer layer passage is at a negative pressure relative to the atmospheric pressure, only external gas can be sucked into the pipe and abnormality can be detected. Pollutants containing oil and gas in the pipe will not leak into the external environment, thereby avoiding environmental pollution. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the technical solutions of the embodiments of the utility model, the drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0018] Figure 1 A schematic diagram of a crankcase ventilation system according to an embodiment of the utility model is shown;

[0019] Figure 2 A schematic diagram showing a crankcase ventilation system crankcase ventilation assembly of an embodiment of the utility model;

[0020] Figure 3 for Figure 2 A cross-sectional view of

[0021] Figure 4 A cross-sectional schematic diagram of a crankcase ventilation system according to an embodiment of the utility model is shown;

[0022] Figure 5 Shown Figure 4 A partial enlarged view of

[0023] Figure 6 Another cross-sectional schematic diagram of the crankcase ventilation system of an embodiment of the utility model is shown;

[0024] Figure 7 Shown Figure 6 A partial enlarged view of

[0025] Reference numerals:

[0026] 1. Bend tube assembly; 11. Double-layer bent tube; 111. Outer tube; 112. Inner tube; 11a. Outer channel; 11b. Inner channel; 12. First joint; 121. First outer tube joint; 1211. First outer insert; 1212. First inner insert; 122. First inner tube joint; 12a. Outer connecting channel; 12b. Inner connecting channel; 13. Second joint; 131. Second inner tube joint; 132. Sealing plug; 1321. Outer ring shoulder; 1322. Front plug; 1323. Rear plug; 14. First outer tube seal; 15. First inner tube seal; 16. Second inner tube seal; 2. Oil-gas separator; 21. Low-pressure channel; 22. High-pressure channel; 3. Inlet pipe; 31. Outer air pipe; 32. Inner air pipe. 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 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 utility model.

[0028] The directional terms mentioned in the present invention, such as "upper", "lower", "front", "back", "left", "right", "inner", "outer", "side", etc., are only for reference to the directions of the attached drawings. Therefore, the directional terms used are used to illustrate and understand the present invention, but not to limit the present invention. In addition, in the drawings, structures with similar or identical structures are represented by the same reference numerals.

[0029] The crankcase ventilation system (Positive Crankcase Ventilation System, PCV system for short) is a key emission control and performance maintenance system in modern internal combustion engine vehicles. Its main purpose is to manage and reduce the pressure in the crankcase, while preventing oil vapor and unburned fuel from being directly discharged into the atmosphere, thereby reducing pollution and improving engine efficiency. The function of the crankcase ventilation system is mainly to guide the gas generated in the crankcase into the intake system to avoid direct discharge into the atmosphere, reduce harmful gas emissions, and comply with environmental regulations. Currently, vehicles equipped with crankcase ventilation systems are required to be equipped with a monitoring system to monitor the PCV system to ensure system integrity. However, the current monitoring system cannot effectively identify aging, cracking or accidental damage to the pipeline, which causes the oil and gas pollutants in the crankcase to leak into the external environment, causing environmental pollution.

[0030] To this end, the embodiments of the utility model provide a crankcase ventilation system and a vehicle, which solves the problem that the existing tortuous pipes cannot be identified in time due to aging and cracking, or puncture by sharp objects, resulting in the leakage of pollutants and polluting the environment. The damage is monitored through the low-negative-pressure outer channel of the double-layer tortuous pipe, and the pollutants in the pipe will not leak out, thereby avoiding environmental pollution.

[0031] The embodiment of the utility model is to solve the above-mentioned problem of environmental pollution, and the specific solution is:

[0032] The curved tube is designed as a double-layer curved tube, and the double-layer curved tube has an outer layer and an inner layer. The double-layer curved tube is connected to the oil-gas separator through a first joint, so that the outer layer of the double-layer curved tube is connected to the low-pressure channel of the oil-gas separator, so that the outer layer of the double-layer curved tube is also in a low negative pressure state. Then, when the surface of the double-layer curved tube is damaged or cracked and leakage occurs, since the outer layer of the double-layer curved tube is in a low negative pressure state, its outer layer is a negative pressure relative to the external atmospheric pressure, so the oil and gas pollutants in the double-layer curved tube will not leak to the outside, avoiding environmental pollution; on the contrary, the external air is sucked into the double-layer curved tube and the abnormality is monitored. Therefore, the scheme of the present application can not only detect the detachment of the pipeline, but also detect the damage of the pipeline.

[0033] In order to better understand the above technical solution, the above technical solution will be described in detail below in conjunction with the accompanying drawings and specific implementation methods.

[0034] See also Figure 1-Figure 7 The utility model embodiment shows a crankcase ventilation system, including a tortuous tube assembly 1 and an oil-gas separator 2, the oil-gas separator 2 having a low-pressure channel 21, the tortuous tube assembly 1 including: a double-layer tortuous tube 11 and a first joint 12, the double-layer tortuous tube 11 including an outer tube 111 and an inner tube 112, an outer channel 11a is defined between the inner wall of the outer tube 111 and the outer wall of the inner tube 112, and an inner channel 11b is defined by the inner wall of the inner tube 112; the first joint 12, one end of which is connected to one end of the double-layer tortuous tube 11, and the other end is connected to the oil-gas separator 2, the first joint 12 is configured to connect the outer channel 11a and the low-pressure channel 21 of the oil-gas separator 2 so that the outer channel 11a is in a low negative pressure state.

[0035] Reference Figure 1-Figure 3Specifically, the double-layer curved tube 11 is a double-layer tube structure, and the double-layer curved tube 11 has an outer tube 111 and an inner tube 112. The specific shape of the double-layer curved tube 11 can be designed according to actual needs, for example, it can be a straight line, or it can be a combination of a straight line and a curved tube. The middle section of the double-layer curved tube 11 of this embodiment is a straight line, and the two ends are curved tubes. Of course, it can be understood that it can also be designed into other shapes. The double-layer curved tube 11 with a double-layer arrangement forms a double-layer gas channel in the tube, which is an outer channel 11a and an inner channel 11b. The outer channel 11a is located between the inner wall of the outer tube 111 and the outer wall of the inner tube 112, and the inner channel 11b is located inside the inner tube 112. The two ends of the double-layer curved tube 11 are respectively connected to the first joint 12 and the second joint 13. The double-layer curved tube 11 is connected to the oil-gas separator 2 through the first joint 12, and the double-layer curved tube 11 is connected to the intake pipe 3 through the second joint 13. The oil-gas separator 2 has a low-pressure channel 21 and a high-pressure channel 22. The low-pressure channel 21 presents a low-pressure area, and the high-pressure channel 22 presents a high-pressure area. The first joint 12 is a component that connects the double-layer curved tube 11 and the oil-gas separator 2. The first joint 12 has a variety of shapes and structures. No matter what shape and structure it is, as long as its structure is capable of connecting the outer channel 11a of the double-layer curved tube 11 with the low-pressure channel 21 of the oil-gas separator 2, it is not limited here. Since the first joint 12 connects the outer channel 11a of the double-layer curved tube 11 with the low-pressure channel 21 of the oil-gas separator 2, the outer channel 11a of the double-layer curved tube 11 is also in a low negative pressure state. A pressure sensor can be set in the outer channel 11a for monitoring. When the double-layer curved tube 11 is cracked or punctured, the outer tube 111 is damaged first, so the outer channel 11a will be connected to the external atmospheric pressure. Since the outer channel 11a is at a low negative pressure, which is a negative pressure relative to the external atmospheric pressure, the oil and gas pollutants in the double-layer curved tube 11 will not leak into the external environment, causing environmental pollution. Only the external air will be sucked into the double-layer curved tube 11, causing the intake abnormality to be monitored by the pressure sensor, thereby giving an alarm on the car's instrument panel.

[0036] Through this embodiment, the tortuous tube is designed as a double-layer tortuous tube 11, so that the outer channel 11a of the double-layer tortuous tube 11 is in a low negative pressure state. Then, when there is a leakage, since the outer channel 11a is at a negative pressure relative to the external atmospheric pressure, only the external gas can be sucked into the tube and the abnormality can be detected, and the oil and gas pollutants in the tube will not leak into the external environment, thereby avoiding environmental pollution.

[0037] In one embodiment, the oil-gas separator 2 has a high-pressure channel 22, and the first joint 12 includes a first outer pipe joint 121 and a first inner pipe joint 122, the first inner pipe joint 122 is installed in the first outer pipe joint 121, the first outer pipe joint 121 is connected to the outer pipe 111, the first inner pipe joint 122 is connected to the inner pipe 112, an outer connecting channel 12a is defined between the outer wall of the first inner pipe joint 122 and the inner wall of the first outer pipe joint 121, and an inner connecting channel 12b is defined by the inner wall of the first inner pipe joint 122; wherein the outer connecting channel 12a connects the outer layer channel 11a and the low-pressure channel 21, and the inner connecting channel 12b connects the inner layer channel 11b and the high-pressure channel 22. Specifically, the first joint 12 is a double-layer joint structure, the first joint 12 has a first outer pipe joint 121 and a first inner pipe joint 122, the first inner pipe joint 122 is fixed in the first outer pipe joint 121, the first outer pipe joint 121 and the first inner pipe joint 122 are both in the structure of a tube body, so the space between the inner wall of the first outer pipe joint 121 and the outer wall of the first inner pipe joint 122 forms an outer connection channel 12a, and the space inside the first inner pipe joint 122 forms an inner connection channel 12b. During installation, the first outer pipe joint 121 is first installed and fixed to the outer tube 111, and the first inner pipe joint 122 is installed and fixed to the inner tube 112. The fixing method can be clamping, interference fit, threaded connection, plug-in, etc., which is not limited here. After the first joint 12 and the double-layer curved tube 11 are installed, the first joint 12 is then installed and fixed to the oil-gas separator 2. Similarly, the fixing method can also be clamping, interference fit, threaded connection, plug-in, etc., which is not limited here. Specifically, the low-pressure channel 21 and the high-pressure channel 22 of the oil-gas separator 2 are arranged in a double-layer internal and external interface, the outlet of the low-pressure channel 21 is the external interface, and the outlet of the high-pressure channel 22 is the internal interface. When the first joint 12 is installed with the oil-gas separator 2, the first external pipe joint 121 is connected to the external interface, and the outer layer channel 11a of the first joint 12 is correspondingly connected to the low-pressure channel 21 of the oil-gas separator 2; the first internal pipe joint 122 is connected to the internal interface, and the inner layer channel 11b of the first joint 12 is correspondingly connected to the high-pressure channel 22 of the oil-gas separator 2. Through the structural design of the internal and external pipe 111 joints of the first joint 12, the effective connection between the outer layer channel 11a and the low-pressure channel 21 and the inner layer channel 11b and the high-pressure channel 22 is achieved, which not only ensures the sealing of the system, but also achieves effective isolation between different pressure areas, thereby improving the stability and reliability of the entire ventilation system.

[0038] In a specific implementation, the outer wall of the first outer pipe joint 121 is provided with a first outer plug-in portion 1211, the inner wall of the first outer pipe joint 121 is provided with a first inner plug-in portion 1212, the first inner plug-in portion 1212 is plugged with the outer pipe 111, and the first outer plug-in portion 1211 is plugged with the low-pressure channel 21. Specifically, the first outer plug-in portion 1211 is arranged around the outer wall of the first outer pipe joint 121, and the first outer plug-in portion 1211 is an annular socket structure, so that the outer interface of the oil-gas separator 2 can be inserted into the annular socket, so that the first outer pipe joint 121 is fixed to the oil-gas separator 2. Similarly, the second outer plug-in portion is arranged around the inner wall of the first outer pipe joint 121, and the second outer plug-in portion is also an annular socket structure, so that the end of the outer pipe 111 can also be inserted into the annular socket, so that the first outer pipe joint 121 is fixed to the outer pipe 111. The plug-in structure of the first outer pipe joint 121 of this embodiment is simple in structure, easy to install, and stable and reliable.

[0039] In this embodiment, the curved tube assembly 1 further includes a first inner tube seal 15, which is sleeved between the outer wall of the first inner tube joint 122 and the inner wall of the high-pressure passage 22, or between the inner wall of the first inner tube joint 122 and the outer wall of the high-pressure passage 22. Specifically, the first inner tube seal 15 is used to seal the inner tube 112. When the first joint 12 is installed with the oil-gas separator 2, the first inner tube joint 122 can be inserted into the inner interface (high-pressure passage 22) of the oil-gas separator 2, then the first inner tube seal 15 is sealed between the outer wall of the first inner tube joint 122 and the inner wall of the inner interface. The first inner tube joint 122 can also be inserted outside the inner interface of the oil-gas separator 2, and the first inner tube seal 15 is sealed between the inner wall of the first inner tube joint 122 and the outer wall of the inner interface. The first inner tube seal 15 can be an O-ring, and an annular groove can be provided on the outer wall of the first inner tube joint 122 to fix the O-ring. The first inner tube seal 15 improves the sealing reliability between the inner layer passage 11 b and the high-pressure passage 22 .

[0040] In this embodiment, the curved tube assembly 1 further includes a first outer tube seal 14, which is sleeved between the outer wall of the first outer tube joint 121 and the inner wall of the low-pressure passage 21, or between the inner wall of the first outer tube joint 121 and the outer wall of the low-pressure passage 21. Specifically, the first outer tube seal 14 is used to seal the outer tube 111. When the first joint 12 is installed with the oil-gas separator 2, the first outer tube joint 121 can be inserted into the outer interface (low-pressure passage 21) of the oil-gas separator 2, then the first outer tube seal 14 is sealed between the outer wall of the first outer tube joint 121 and the inner wall of the outer interface. The first outer tube joint 121 can also be inserted outside the outer interface of the oil-gas separator 2, and the first outer tube seal 14 is sealed between the inner wall of the first outer tube joint 121 and the outer wall of the outer interface. The first outer tube seal 14 can be an O-ring, and an annular groove can be provided on the outer wall of the first outer tube joint 121 to fix the O-ring. The first outer tube seal 14 improves the sealing reliability between the outer layer passage 11 a and the low pressure passage 21 .

[0041] In one embodiment, the crankcase ventilation system further includes an intake pipe 3, and the curved tube assembly 1 further includes a second joint 13, one end of the second joint 13 is connected to the intake pipe 3, and the other end of the second joint 13 is connected to the other end of the double-layer curved tube 11. Specifically, the intake pipe 3 is the intake pipe 3 of the entire vehicle, the other end of the double-layer curved tube 11 is connected to the second joint 13, and the double-layer curved tube 11 is connected to the intake pipe 3 through the second joint 13. The second joint 13 has a variety of shapes and structures, which are not limited here. During installation, the second joint 13 is first installed on the double-layer curved tube 11, and then the second joint 13 is connected to the intake pipe 3, so that the intake pipe 3 is connected to the curved tube, and fresh air from the outside is introduced through the intake pipe 3.

[0042] In this embodiment, the air intake pipe 3 includes an outer air pipe 31 and an inner air pipe 32, and the second joint 13 includes a second inner pipe joint 131 and a sealing plug 132 arranged around the outer wall of the second inner pipe joint 131. The two ends of the second inner pipe joint 131 are respectively connected to the inner air pipe 32 and the inner pipe 112, and the two ends of the sealing plug 132 are respectively interference fit with the outer air pipe 31 and the outer pipe 111. Specifically, the air intake pipe 3 is a double-layer pipe structure, and the air intake pipe 3 has an outer air pipe 31 and an inner air pipe 32. The second joint 13 is a single-layer channel structure, and the second joint 13 has a second inner pipe joint 131, and the second inner pipe joint 131 is in the shape of a tube body. The two ends of the second inner pipe joint 131 are respectively connected to the inner pipe 112 of the double-layer curved tube 11 and the inner air pipe 32 of the air intake pipe 3, so as to connect the air intake pipe 3 with the double-layer curved tube 11. The outer wall of the second inner tube joint 131 is provided with a circle of sealing plug 132, which extends along the axial direction of the second inner tube joint 131 and has a cylindrical shape. The outer diameter of the sealing plug 132 matches the inner diameter of the outer air pipe 31 and the outer tube 111, so that the two ends of the sealing plug 132 can respectively have an interference fit with the outer air pipe 31 and the outer tube 111. In this way, the sealing ring between the outer air pipe 31 and the sealing plug 132 can be omitted, that is, the sealing ring between the outer tube 111 and the sealing plug 132 can be omitted, and no O-ring is required for additional sealing, which saves costs while improving sealing reliability.

[0043] In this embodiment, the outer wall of the sealing plug 132 is provided with an outer ring shoulder 1321, and the outer ring shoulder 1321 divides the sealing plug 132 into a front plug 1322 and a rear plug 1323 along the axial direction of the sealing plug 132. The front plug 1322 is interference fit with the outer air pipe 31, and the end of the outer air pipe 31 abuts against the outer ring shoulder 1321, and the rear plug 1323 is interference fit with the outer pipe 111. Specifically, the sealing plug 132 extends along the axial direction of the second inner pipe joint 131, and a circle of outer ring shoulder 1321 is also provided on the outer wall of the sealing plug 132. The outer ring shoulder 1321 is set in the middle position of the sealing plug 132, thereby dividing the outer ring shoulder 1321 into two halves, generally the front plug 1322 and the other half is the rear plug 1323. The outer diameter of the front plug 1322 matches the inner diameter of the outer air pipe 31, and the front plug 1322 and the outer air pipe 31 have an interference fit. The outer diameter of the rear plug 1323 matches the inner diameter of the outer tube 111, and the rear plug 1323 and the outer tube 111 have an interference fit. The structure is simple and the installation is convenient.

[0044] In this embodiment, the curved tube assembly 1 further includes a second inner tube seal 16, which is sleeved between the outer wall of the second inner tube joint 131 and the inner wall of the inner air pipe 32, or the second inner tube seal 16 is sleeved between the inner wall of the second inner tube joint 131 and the outer wall of the inner air pipe 32. Specifically, the second inner tube seal 16 is used to seal the inner tube 112. When the second joint 13 is installed with the intake pipe 3, the second inner tube joint 131 can be inserted into the inner air pipe 32 of the intake pipe 3, and then the second inner tube seal 16 is sealed between the outer wall of the second inner tube joint 131 and the inner wall of the inner air pipe 32. The second inner tube joint 131 can also be inserted outside the inner air pipe 32 of the intake pipe 3, and the second inner tube seal 16 is sealed between the inner wall of the second inner tube joint 131 and the outer wall of the inner air pipe 32. The second inner tube seal 16 may be an O-ring, and an annular groove may be provided on the outer wall of the second inner tube joint 131 to fix the O-ring. The second inner tube seal 16 improves the sealing reliability between the inner layer channel 11b and the inner air pipe 32.

[0045] The present invention also provides an automobile, comprising the crankcase ventilation system of the above embodiment. Specifically, the crankcase ventilation system has been described in detail in the above embodiment, and for the sake of brevity of the specification, it will not be repeated here.

[0046] The automobile of this embodiment adopts the crankcase ventilation system of the above-mentioned embodiment. When the double-layer curved tube 11 leaks, since the outer channel is the low-pressure area of ​​the connected oil-gas separator and the pressure is lower than the atmospheric pressure, the fresh air in the environment enters the outer channel through the damaged outer tube. Therefore, even if the components fail, the environment will not be polluted, thereby realizing an efficient, environmentally friendly and stable crankcase ventilation system, which can improve the performance of the automobile and reduce environmental pollution.

[0047] The above is only a specific implementation of the utility model, but the protection scope of the utility model is not limited thereto. Any technician familiar with the technical field can easily think of various equivalent modifications or replacements within the technical scope disclosed by the utility model, and these modifications or replacements should be included in the protection scope of the utility model. Therefore, the protection scope of the utility model should be based on the protection scope of the claims.

Claims

1. A crankcase ventilation system, characterized in that: It includes a tortuosity pipe assembly and an oil-gas separator, wherein the oil-gas separator has a low-pressure passage, and the tortuosity pipe assembly includes: A double-layer curved tube, comprising an outer tube and an inner tube, wherein an outer layer channel is defined between the inner wall of the outer tube and the outer wall of the inner tube, and an inner layer channel is defined by the inner wall of the inner tube; A first joint, one end of which is connected to one end of the double-layer curved tube and the other end of which is connected to the oil-gas separator. The first joint is configured to connect the outer channel and the low-pressure channel of the oil-gas separator so that the outer channel is in a low negative pressure state.

2. The crankcase ventilation system according to claim 1, characterized in that The oil-gas separator has a high-pressure channel, the first joint includes a first outer pipe joint and a first inner pipe joint, the first inner pipe joint is installed in the first outer pipe joint, the first outer pipe joint is connected to the outer pipe, the first inner pipe joint is connected to the inner pipe, an outer connecting channel is defined between the outer wall of the first inner pipe joint and the inner wall of the first outer pipe joint, and an inner connecting channel is defined by the inner wall of the first inner pipe joint; wherein the outer connecting channel connects the outer layer channel and the low-pressure channel, and the inner connecting channel connects the inner layer channel and the high-pressure channel.

3. The crankcase ventilation system according to claim 2, characterized in that: The bent tube assembly also includes a first inner tube seal, which is sleeved between the outer wall of the first inner tube joint and the inner wall of the high-pressure channel, or between the inner wall of the first inner tube joint and the outer wall of the high-pressure channel.

4. The crankcase ventilation system according to claim 2, characterized in that: The curved tube assembly also includes a first outer tube seal, which is sleeved between the outer wall of the first outer tube joint and the inner wall of the low-pressure channel, or between the inner wall of the first outer tube joint and the outer wall of the low-pressure channel.

5. The crankcase ventilation system according to claim 2, characterized in that: The outer wall of the first outer tube joint is provided with a first outer insertion portion, the inner wall of the first outer tube joint is provided with a first inner insertion portion, the first inner insertion portion is plugged into the outer tube, and the first outer insertion portion is plugged into the low-pressure channel.

6. The crankcase ventilation system according to any one of claims 1 to 5, characterized in that: The crankcase ventilation system also includes an intake pipe, and the curved tube assembly also includes a second joint, one end of the second joint is connected to the intake pipe, and the other end of the second joint is connected to the other end of the double-layer curved tube.

7. The crankcase ventilation system according to claim 6, characterized in that The air inlet pipe includes an outer air pipe and an inner air pipe, the second joint includes a second inner pipe joint and a sealing plug arranged on the outer wall of the second inner pipe joint, the two ends of the second inner pipe joint are respectively connected to the inner air pipe and the inner pipe, and the two ends of the sealing plug are respectively interference fit with the outer air pipe and the outer pipe.

8. The crankcase ventilation system according to claim 7, characterized in that The curved tube assembly also includes a second inner tube seal, which is sleeved between the outer wall of the second inner tube joint and the inner wall of the inner air pipe, or the second inner tube seal is sleeved between the inner wall of the second inner tube joint and the outer wall of the inner air pipe.

9. The crankcase ventilation system according to claim 7, characterized in that The outer wall ring of the sealing plug is provided with an outer ring shoulder, and the outer ring shoulder divides the sealing plug into a front plug and a rear plug along the axial direction of the sealing plug. The front plug has an interference fit with the external air pipe, and the end of the external air pipe abuts against the outer ring shoulder, and the rear plug has an interference fit with the external pipe.

10. An automobile, characterized in that: Comprising a crankcase ventilation system as claimed in any one of claims 1 to 9.

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