Crankcase ventilation pipe for vehicle

Abstract

The utility model discloses an automotive crankcase ventilation pipe, which belongs to the technical field of crankcase ventilation pipes and is characterized by comprising a pipe joint, an outer pipe, an inner pipe, a connector and a connecting pipe, the pipe joint is connected with a connector of a crankcase, the outer pipe is detachably connected with the pipe joint through the connector, and the inner pipe is detachably connected with the pipe joint through the connecting pipe. The connecting pipe is communicated with a connector of the crankcase and the pipe joint, the inner pipe is arranged in the outer pipe, the inner pipe is communicated with an air outlet pipe of an air filter, and a clearance space is formed between the outer pipe and the inner pipe. Cold air or condensate water in the external environment is prevented from being in direct contact with the inner pipe, the clearance space between the outer pipe and the inner pipe can effectively reduce heat exchange between the inner pipe and the external environment, the temperature reduction speed in the inner pipe is slowed down, the inner pipe is prevented from being frozen to cause blockage, and smooth operation of the curved through box ventilation pipe in the low-temperature environment is ensured.

Description

Technical Field

[0001] The utility model belongs to the technical field of crankcase ventilation pipes, in particular to a crankcase ventilation pipe for a vehicle. Background Art

[0002] In the engine system of the car, the crankcase ventilation pipe (vent pipe) plays a vital role. It connects the crankcase cylinder head cover and the outlet pipe of the air filter. When the engine is in operation, part of the combustible mixture and exhaust gas may enter the crankcase through the piston ring. These gases contain multiple components such as incompletely burned fuel gas, water vapor and exhaust gas. Their presence may not only dilute the engine oil, reduce its lubrication performance, and accelerate the oxidation and deterioration of the engine oil, but also form sludge in the engine oil due to condensation of water vapor, blocking the oil circuit, and the acidic gas in the exhaust gas will corrode the engine's lubrication system and accelerate the wear of parts. In order to effectively deal with these problems, the crankcase ventilation device came into being. It guides the oil and gas in the crankcase to the outlet pipe of the air filter through the crankcase ventilation pipe. Then these gases are sucked in and burned by the engine again, realizing the recovery of combustible gas and reducing the pollution to the atmosphere. This process not only ensures the cleanliness and performance of the engine oil, but also effectively prevents oil leakage and part corrosion caused by excessive pressure in the crankcase.

[0003] However, it is worth noting that the Qutong box ventilation pipe may face some challenges in certain environments. Since the gas discharged from the cylinder head cover is saturated with water vapor and oil gas, when these gases pass through the low-temperature area, the water vapor may condense into water droplets. Since the flow rate in the Qutong pipe is relatively low, these water droplets are difficult to quickly flow from the low-temperature area to the relatively high-temperature area. Therefore, under the continuous low temperature, the water droplets may gradually freeze and block the pipeline. Moreover, when the Qutong box ventilation pipe is in a low-temperature area, especially when a certain section is in an extremely low-temperature environment, the water vapor inside will gradually freeze and block the pipeline. This blockage will not only reduce the efficiency of the engine, resulting in insufficient power when the vehicle is driving, but in severe cases, it may also cause serious problems such as flameout and burning oil. Therefore, how to ensure the smooth operation of the Qutong box ventilation pipe in a low-temperature environment is an urgent problem to be solved. Utility Model Content

[0004] The utility model aims to solve the above problems in the prior art and proposes a crankcase ventilation pipe for a vehicle. The technical problem to be solved by the utility model is: how to ensure that the crankcase ventilation pipe runs smoothly in a low temperature environment.

[0005] The above technical purpose of the utility model can be achieved through the following technical solutions: a vehicle crankcase ventilation pipe, comprising a pipe joint, an outer pipe, an inner pipe, a connecting head and a connecting pipe, the pipe joint is connected to the interface of the crankcase, the outer pipe is detachably connected to the pipe joint through the connecting head, the inner pipe is detachably connected to the pipe joint through the connecting pipe, the connecting pipe connects the interface of the crankcase and the pipe joint, the inner pipe is arranged in the outer pipe, the inner pipe is connected to the outlet pipe of the air filter, and there is a gap space between the outer pipe and the inner pipe.

[0006] In the above-mentioned crankcase ventilation pipe for a vehicle, a positioning flange 1 is provided on the outer side wall of the pipe joint, and a positioning protrusion is provided on the inner side wall of the connecting head, and the positioning protrusion is clamped on the positioning flange 1.

[0007] In the above-mentioned vehicle crankcase ventilation pipe, the end of the connecting head is provided with a plurality of barbs, the end of the connecting head is inserted into the outer tube, and the plurality of barbs are all against the inner wall of the outer tube.

[0008] In the above-mentioned vehicle crankcase ventilation pipe, positioning step one and positioning step two are provided on the connecting head, the end of the pipe joint abuts against the step surface of the positioning step one, and the end of the outer tube abuts against the step surface of the positioning step two.

[0009] In the above-mentioned vehicle crankcase ventilation pipe, one end of the connecting pipe is inserted into the pipe joint, the outer wall of the connecting pipe is provided with a second positioning flange, and the inner wall of the connecting head is provided with a positioning hook, and the positioning hook is engaged with the second positioning flange.

[0010] In the above-mentioned vehicle crankcase ventilation pipe, the other end of the connecting pipe is provided with a plurality of barbs 2, the end of the connecting pipe is inserted into the inner pipe, and the plurality of barbs 2 are all against the inner wall of the inner pipe.

[0011] In the above-mentioned crankcase ventilation pipe for a vehicle, a positioning flange three is provided on the outer wall of the connecting pipe, a positioning step three is provided in the connecting head, the step surface of the positioning step three abuts against one end surface of the positioning flange three, and the end of the inner pipe abuts against the other end surface of the positioning flange three.

[0012] In the above-mentioned crankcase ventilation pipe for a vehicle, a first sealing ring is arranged between the pipe joint and the connecting head, and a second sealing ring is arranged between the pipe joint and the connecting pipe.

[0013] In the above-mentioned vehicle crankcase ventilation pipe, the pipe joint is welded to the interface of the crankcase.

[0014] In the above-mentioned crankcase ventilation pipe for a vehicle, an escape notch is provided on the outer side wall of the connector.

[0015] In summary, the beneficial effects of the present invention compared with the prior art are as follows:

[0016] The pipe joint is connected to the interface of the crankcase, and the inner pipe is detachably connected to the pipe joint through a connecting pipe, and the connecting pipe connects the interface of the crankcase and the pipe joint. The oil and gas in the crankcase can flow out from the interface, and then flow into the inner pipe through the pipe joint and the connecting pipe in turn, and then the oil and gas are guided to the outlet pipe of the air filter through the inner pipe. Since the inner pipe is arranged in the outer pipe, there is a gap space between the outer pipe and the inner pipe, so as to prevent cold air or condensed water in the external environment from directly contacting the inner pipe, and the gap space between the outer pipe and the inner pipe can effectively reduce the heat exchange between the inner pipe and the external environment, slow down the temperature drop rate in the inner pipe, so as to prevent the inner pipe from freezing and causing blockage, thereby ensuring the smooth operation of the crankcase ventilation pipe in a low temperature environment. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a structural schematic diagram of an embodiment;

[0018] Figure 2 is a cross-sectional view of an embodiment;

[0019] Figure 3 It is a partial structural schematic diagram of an embodiment;

[0020] Figure 4 It is a structural schematic diagram of a connector in an embodiment;

[0021] Figure 5 This is a schematic structural diagram of the connector from another angle in the embodiment;

[0022] Figure 6 Schematic diagram of the structure of the connecting pipe of the embodiment.

[0023] Figure numerals: 1. pipe joint; 2. outer tube; 3. inner tube; 4. connector; 5. connecting tube; 6. gap space; 7. positioning flange one; 8. positioning protrusion; 9. barb one; 10. positioning step one; 11. positioning step two; 12. positioning flange two; 13. positioning hook; 14. barb two; 15. positioning flange three; 16. sealing ring one; 17. receiving groove one; 18. sealing ring two; 19. receiving groove two; 20. avoidance gap; 21. positioning step three. DETAILED DESCRIPTION

[0024] The following are specific embodiments of the present invention and the accompanying drawings to further describe the technical solution of the present invention, but the present invention is not limited to these embodiments.

[0025] A crankcase ventilation pipe for a vehicle, such as Figures 1 to 6 As shown, it includes a pipe joint 1, an outer tube 2, an inner tube 3, a connector 4 and a connecting pipe 5. The pipe joint 1 is connected to the interface of the crankcase. Preferably, in this embodiment, the pipe joint 1 and the interface of the crankcase are connected by welding, and the welding method can be ultrasonic welding or hot plate welding.

[0026] The outer tube 2 is detachably connected to the pipe joint 1 via the connecting head 4, and the inner tube 3 is detachably connected to the pipe joint 1 via the connecting pipe 5. Since the connecting head 4, the connecting pipe 5, the outer tube 2 and the inner tube 3 are all detachable, subsequent maintenance and replacement are more convenient.

[0027] The connecting pipe 5 connects the interface of the crankcase with the pipe joint 1, the inner pipe 3 is arranged in the outer pipe 2, the inner pipe 3 is connected with the outlet pipe of the air filter, and there is a gap space 6 between the outer pipe 2 and the inner pipe 3. It should be noted that by arranging the inner pipe 3 in the outer pipe 2, there is a gap space 6 between the outer pipe 2 and the inner pipe 3, so as to prevent the cold air or condensed water in the external environment from directly contacting the inner pipe 3, and the gap space 6 between the outer pipe 2 and the inner pipe 3 can effectively reduce the heat exchange between the inner pipe 3 and the external environment, slow down the temperature drop rate in the inner pipe 3, so as to prevent the inner pipe 3 from freezing and causing blockage, thereby ensuring the smooth operation of the crankcase ventilation pipe in a low temperature environment.

[0028] The outer side wall of the pipe joint 1 is provided with a positioning flange 7, which is arranged along the circumference of the pipe joint 1, and the positioning flange 7 is integrally arranged with the pipe joint 1. The inner side wall of the connecting head 4 is provided with a positioning protrusion 8, which is arranged along the circumference of the connecting head 4, and the positioning protrusion 8 is arranged with the connecting head 4 body. The positioning protrusion 8 is clamped on the positioning flange 7, so as to realize the connection between the connecting head 4 and the pipe joint 1, and ensure that the connecting head 4 and the pipe joint 1 are relatively stable. When disassembling, the connecting head 4 can be separated from the pipe joint 1 by simply detaching the positioning protrusion 8 from the positioning flange 7.

[0029] A positioning step 10 is provided on the connector 4 , and the end of the pipe connector 1 abuts against the step surface of the positioning step 10 , thereby further improving the stability of the connector 4 and the pipe connector 1 .

[0030] A plurality of barbs 9 are provided at the end of the connector 4. The end of the connector 4 is inserted into the outer tube 2. The plurality of barbs 9 are all against the inner wall of the outer tube 2. Through the action of the plurality of barbs 9, when the connector 4 is inserted into the outer tube 2, the barbs 9 form a close contact with the inner wall of the outer tube 2 to prevent the connector 4 from being easily pulled out of the outer tube 2, thereby realizing the connection between the connector 4 and the outer tube 2 and ensuring the stability of the connector 4 and the outer tube 2.

[0031] The connector 4 is provided with a second positioning step 11 , and the end of the outer tube 2 abuts against the step surface of the second positioning step 11 , thereby further improving the stability of the connector 4 and the outer tube 2 .

[0032] One end of the connecting pipe 5 is inserted into the pipe joint 1, so that the connecting pipe 5 is connected to the pipe joint 1, and the pipe joint 1 is connected to the interface of the crankcase, thereby realizing the connection between the connecting pipe 5 and the interface of the crankcase.

[0033] The outer wall of the connecting tube 5 is provided with a second positioning flange 12, and the second positioning flange 12 is arranged along the circumference of the connecting tube 5. The second positioning flange 12 and the connecting tube 5 are integrally arranged. The inner wall of the connecting head 4 is provided with a positioning hook 13, and the positioning hook 13 is connected to the second positioning flange 12. In this embodiment, there are several positioning hooks 13 and they are evenly distributed along the circumference. The positioning hooks 13 are connected to the second positioning flange 12 to achieve the connection between the connecting head 4 and the connecting tube 5, thereby ensuring that the connecting head 4 and the connecting tube 5 are relatively stable. Since the connecting head 4 and the pipe joint 1 remain relatively stable, the connecting tube 5 and the connecting head 4 remain relatively stable. When disassembling, it is only necessary to detach the positioning hook 13 from the second positioning flange 12 to separate the connecting tube 5 from the connecting head 4.

[0034] The other end of the connecting tube 5 is provided with a plurality of barbs 14, and the end of the connecting tube 5 is inserted into the inner tube 3, and the plurality of barbs 14 are all against the inner wall of the inner tube 3. Through the action of the plurality of barbs 14, when the connecting head 4 is inserted into the inner tube 3, the barbs 14 form a close contact with the inner wall of the inner tube 3, preventing the connecting head 4 from being easily pulled out of the inner tube 3, thereby realizing the connection between the connecting head 4 and the inner tube 3 and ensuring the stability of the connecting head 4 and the inner tube 3.

[0035] The outer wall of the connecting tube 5 is provided with a positioning flange three 15, and the positioning flange three 15 is arranged along the circumference of the connecting tube 5. The positioning flange three 15 and the connecting tube 5 are arranged integrally. A positioning step three 21 is provided in the connecting head 4, and the step surface of the positioning step three 21 abuts against an end surface of the positioning flange three 15, thereby further improving the stability of the connecting head 4 and the connecting tube 5 and further improving the stability of the connecting head 4 and the inner tube 3.

[0036] A sealing ring 16 is provided between the pipe joint 1 and the connector 4. Specifically, a receiving groove 17 for accommodating the sealing ring 16 is provided on the side wall of the connector 4. The sealing ring 16 is used to seal the pipe joint 1 and the connector 4 to ensure the sealing between the two.

[0037] A sealing ring 18 is provided between the pipe joint 1 and the connecting pipe 5. Specifically, a receiving groove 19 for accommodating the sealing ring 18 is provided on the outer wall of the connecting pipe 5. The sealing ring 18 is used to seal the pipe joint 1 and the connecting pipe 5 to ensure the sealing between the two.

[0038] An escape notch 20 is provided on the outer side wall of the connector 4, so that during disassembly, the operator can operate from the escape notch 20 to disengage the positioning protrusion 8 from the positioning flange 7, thereby separating the connector 4 from the pipe joint 1.

[0039] The specific embodiments described in this article are merely examples of the spirit of the utility model; technicians in the technical field to which the utility model belongs can make various modifications or additions to the described specific embodiments or replace them in a similar manner, but will not deviate from the spirit of the utility model or exceed the scope defined by the attached claims.

Claims

1. A crankcase ventilation pipe for a vehicle, characterized in that: The invention comprises a pipe joint (1), an outer pipe (2), an inner pipe (3), a connecting head (4) and a connecting pipe (5); the pipe joint (1) is connected to the interface of a crankcase; the outer pipe (2) is detachably connected to the pipe joint (1) via the connecting head (4); the inner pipe (3) is detachably connected to the pipe joint (1) via the connecting pipe (5); the connecting pipe (5) communicates the interface of the crankcase with the pipe joint (1); the inner pipe (3) is arranged inside the outer pipe (2); the inner pipe (3) is connected to the air outlet pipe of an air filter; and a gap space (6) is provided between the outer pipe (2) and the inner pipe (3).

2. The vehicle crankcase ventilation pipe according to claim 1, characterized in that: The outer side wall of the pipe joint (1) is provided with a positioning flange (7), and the inner side wall of the connector (4) is provided with a positioning protrusion (8), and the positioning protrusion (8) is snap-connected to the positioning flange (7).

3. The vehicle crankcase ventilation pipe according to claim 1, characterized in that: The end of the connector (4) is provided with a plurality of barbs (9), the end of the connector (4) is inserted into the outer tube (2), and the plurality of barbs (9) are in contact with the inner wall of the outer tube (2).

4. The vehicle crankcase ventilation pipe according to claim 1, characterized in that: The connector (4) is provided with a first positioning step (10) and a second positioning step (11); the end of the pipe joint (1) abuts against the step surface of the first positioning step (10); and the end of the outer tube (2) abuts against the step surface of the second positioning step (11).

5. The vehicle crankcase ventilation pipe according to claim 1, characterized in that: One end of the connecting pipe (5) is inserted into the pipe joint (1), the outer wall of the connecting pipe (5) is provided with a second positioning flange (12), and the inner wall of the connecting head (4) is provided with a positioning hook (13), and the positioning hook (13) is engaged with the second positioning flange (12).

6. The vehicle crankcase ventilation pipe according to claim 1, characterized in that: The other end of the connecting tube (5) is provided with a plurality of barbs (14), the end of the connecting tube (5) is inserted into the inner tube (3), and the plurality of barbs (14) are in contact with the inner wall of the inner tube (3).

7. The vehicle crankcase ventilation pipe according to claim 5, characterized in that: The outer wall of the connecting tube (5) is provided with a positioning flange three (15), and the connecting head (4) is provided with a positioning step three (21), the step surface of the positioning step three (21) abuts against one end surface of the positioning flange three (15), and the end of the inner tube (3) abuts against the other end surface of the positioning flange three (15).

8. The vehicle crankcase ventilation pipe according to claim 1, characterized in that: A sealing ring 1 (16) is provided between the pipe joint (1) and the connecting head (4), and a sealing ring 2 (18) is provided between the pipe joint (1) and the connecting pipe (5).

9. The vehicle crankcase ventilation pipe according to claim 1, characterized in that: The pipe joint (1) is welded to the interface of the crankcase.

10. The vehicle crankcase ventilation pipe according to claim 1, characterized in that: An escape notch (20) is provided on the outer side wall of the connector (4).

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