A crankcase ventilation duct system that prevents water accumulation and icing

Abstract

This utility model discloses a crankcase ventilation piping system that prevents water accumulation and icing, belonging to the field of engine technology. It solves the problem that in existing crankcase ventilation systems, the liquid water accumulated in the external piping is easily frozen under extremely cold conditions, leading to pipe blockage or component failure, and consequently affecting the normal operation of the engine. This water-proof and icing-proof crankcase ventilation piping system includes a cylinder block, a cylinder head on top of the cylinder block, and a cylinder head cover on top of the cylinder head. The cylinder head cover contains a labyrinth-type breather, and an external oil-gas separator is located on the outer wall of the cylinder block. A connecting pipe is provided between the cylinder head cover and the external oil-gas separator. An oil return pipe is located at the bottom of the external oil-gas separator, and an external through pipe is located on one side of the cylinder block on the external oil-gas separator side. This utility model's water-proof and icing-proof crankcase ventilation piping system ensures the normal operation of the engine.

Description

Technical Field

[0001] This utility model relates to the field of engine technology, and more specifically, it relates to a crankcase ventilation pipeline system that prevents water accumulation and icing. Background Technology

[0002] The crankcase ventilation system is a key auxiliary system of the engine, used to expel or guide the combustible mixture, water vapor and exhaust gas that leak into the crankcase back into the combustion chamber, in order to prevent oil dilution, deterioration and excessive crankcase pressure.

[0003] However, in cold environments such as northern winters and high-altitude mining areas, condensation easily accumulates in the external piping of existing crankcase ventilation systems (such as connecting pipes, vent pipes, and oil return pipes) and external oil-gas separators. Under extremely cold conditions, this accumulated liquid water is highly susceptible to freezing, leading to pipe blockage or component failure. In severe cases, it may damage engine components, affecting the normal operation and reliability of the engine. Utility Model Content

[0004] The technical problem to be solved by this utility model is to address the above-mentioned shortcomings of the prior art by providing a crankcase ventilation pipeline system that prevents water accumulation and icing, which can effectively reduce the risk of icing of external pipelines in extremely cold environments, ensure the normal operation and reliability of the engine, and effectively extend the service life of the engine.

[0005] The technical solution of this utility model is as follows: a crankcase ventilation pipeline system for preventing water accumulation and icing, including a cylinder body, a cylinder head on the top of the cylinder body, and a cylinder head cover on the top of the cylinder head. The cylinder head cover is characterized by having a labyrinth-type breather inside, an external oil-gas separator on the outer wall of the cylinder body, a connecting pipe between the cylinder head cover and the external oil-gas separator, a return oil pipe at the bottom of the external oil-gas separator, an external through pipe on one side of the cylinder body of the external oil-gas separator, and a heat-insulating structure on the connecting pipe, the external through pipe, and the return oil pipe. The heat-insulating structure includes a rubber tube layer and a heat-insulating layer, with the heat-insulating layer covering the rubber tube layer and the rubber tube layer covering the connecting pipe, the external through pipe, and the return oil pipe. The bends of the connecting pipe are all rounded transition structures, and the outer wall of the external oil-gas separator is wrapped with a heat-insulating layer.

[0006] As a further improvement, the external oil-gas separator is made of engineering plastic, specifically PA6+GF30.

[0007] Furthermore, the insulation layer includes heat shrink tubing and rubber-plastic foam, with the heat shrink tubing sleeved on the rubber tubing layer and the rubber-plastic foam sleeved on the heat shrink tubing.

[0008] Furthermore, the thickness of the heat shrink tubing is 0.5mm-1.5mm, and the thickness of the rubber-plastic sponge is 8mm-12mm.

[0009] Furthermore, the rubber-plastic sponge is made of nitrile rubber and polyvinyl chloride.

[0010] Furthermore, the connecting pipe includes a straight pipe and a bend, the straight pipe and the bend are connected, and the inner wall of the straight pipe is tangent to the inner wall of the bend.

[0011] Furthermore, the ratio of the bending radius D of the bend to the inner diameter R of the straight pipe is 2.

[0012] Furthermore, an installation bracket is provided on the external pipe below the oil return pipe, and the installation bracket is detachably installed on the cylinder block.

[0013] Furthermore, one end of the external pipe extends downward to the bottom of the cylinder body, the oil return pipe bypasses the external pipe and connects to the cylinder body, and the outer wall surface of the oil return pipe is in contact with the outer wall surface of the external pipe.

[0014] Beneficial effects

[0015] Compared with the prior art, this utility model has the following advantages:

[0016] This utility model discloses a crankcase ventilation piping system that prevents water accumulation and icing. By insulating the external piping, it maintains the working temperature of the connecting pipe, external pipe, and oil return pipe in extremely cold environments, preventing condensation from forming inside the pipes. In extremely cold environments, the condensate freezes into ice, blocking the pipes. This effectively reduces the risk of icing in the external piping in extremely cold environments, ensuring the normal operation of the crankcase ventilation system, thereby ensuring the normal operation and reliability of the engine and effectively extending the engine's service life. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the main structure of this utility model;

[0018] Figure 2 This is a cross-sectional structural diagram of the thermal insulation structure in this utility model;

[0019] Figure 3 This is a schematic diagram of the thermal insulation layer in this utility model;

[0020] Figure 4 This is a partial cross-sectional structural diagram of the connecting pipe in this utility model.

[0021] Among them: 1-Cylinder head cover, 2-Connecting pipe, 3-Cylinder head, 4-Cylinder block, 5-External oil-gas separator, 6-External pipe, 7-Return oil pipe, 8-Rubber hose layer, 9-Insulation layer, 10-Mounting bracket, 21-Straight pipe, 22-Bend pipe, 91-Heat shrink tubing, 92-Rubber sponge. Detailed Implementation

[0022] The present invention will be further described below with reference to specific embodiments shown in the accompanying drawings.

[0023] See Figure 1-4 A crankcase ventilation piping system for preventing water accumulation and icing includes a cylinder block 4, a cylinder head 3 on top of the cylinder block 4, a cylinder head cover 1 on top of the cylinder head 3, a labyrinth-type breather inside the cylinder head cover 1, an external oil-gas separator 5 on the outer wall of the cylinder block 4, a connecting pipe 2 between the cylinder head cover 1 and the external oil-gas separator 5, a return oil pipe 7 at the bottom of the external oil-gas separator 5, and an external through pipe 6 on one side of the cylinder block 4 of the external oil-gas separator 5. One end of the connecting pipe 6 is connected to the cylinder block 4. The external connecting pipe 6 is open to the atmosphere to balance the pressure difference inside and outside the crankcase, preventing damage to the oil seal or affecting the lubrication effect due to excessive pressure. Insulation structures are fitted onto the connecting pipe 2, the external connecting pipe 6, and the return oil pipe 7. The insulation structure includes a rubber tube layer 8 and an insulation layer 9. The insulation layer 9 is fitted onto the rubber tube layer 8, and the rubber tube layer 8 is fitted onto the connecting pipe 2, the external connecting pipe 6, and the return oil pipe 7. All bends in the connecting pipe 2 are rounded. The external oil-gas separator 5 features a slope structure to prevent water from accumulating at the bends in the connecting pipe 2 when the engine is positioned on a slope. This prevents the water from freezing in extremely cold weather, reducing the risk of system icing. An insulation layer 9 is wrapped around the outer wall of the external oil-gas separator 5 to insulate it. In extremely cold environments, the viscosity of oil vapor and droplets inside the external oil-gas separator 5 increases, reducing their fluidity and making them more prone to condensation and adhesion to the pipe walls and the inner wall of the separator. The insulation layer 9 prevents a decrease in the separation efficiency of the external oil-gas separator 5. Furthermore, in extremely cold environments, water vapor inside the external oil-gas separator 5 easily condenses into water and then freezes into ice. The insulation layer 9 prevents the water vapor inside the external oil-gas separator 5 from freezing and blocking the oil-gas passage, effectively ensuring the normal operation of the external oil-gas separator 5 in extremely cold environments, thereby ensuring the normal operation and reliability of the engine.

[0024] By installing an insulation structure on the external pipeline, the working temperature of the connecting pipe 2, external pipe 6, and return oil pipe 7 can be maintained in extremely cold environments, preventing condensation from forming inside the pipes. In extremely cold environments, the condensation will freeze and block the pipes, effectively reducing the risk of icing of the external pipeline in extremely cold environments and ensuring the normal operation of the crankcase ventilation system.

[0025] In this embodiment, the external oil-gas separator 5 is made of engineering plastic, specifically PA6+GF30. The engine is a high-temperature environment, and the external oil-gas separator 5, installed on the cylinder block 4, comes into contact with high-temperature engine oil and exhaust gases. The engineering plastic made of PA6+GF30 has good heat resistance, ensuring that the external oil-gas separator 5 maintains its shape and structural stability under long-term high-temperature conditions. Furthermore, the density of this engineering plastic is lower than that of aluminum alloy, resulting in a lower overall weight for the external oil-gas separator 5 made of engineering materials, which helps reduce overall vehicle fuel consumption and emissions.

[0026] In this embodiment, the insulation layer 9 includes heat shrink tubing 91 and rubber-plastic sponge 92. The heat shrink tubing 91 is sleeved on the rubber tube layer 8, and the rubber-plastic sponge 92 is sleeved on the heat shrink tubing 91. The heat shrink tubing 91 can form a protective sealing layer on the connecting pipe 2, external pipe 6, and return oil pipe 7 it wraps, effectively preventing water vapor, rainwater, de-icing agents, etc. from contacting the surface of the oil connecting pipe 2, external pipe 6, and return oil pipe 7, preventing condensation and corrosion, and effectively extending their service life. In addition, the rubber-plastic sponge 92 has a good heat insulation effect and can greatly slow down the heat loss. The overall thermal conductivity of the insulation layer 9 is <0.034W / mK.

[0027] In this embodiment, the thickness of the heat shrink tubing 91 is 0.5mm-1.5mm, and the thickness of the rubber and plastic sponge 92 is 8mm-12mm. The thickness of 0.5mm-1.5mm makes the heat shrink tubing 91 very flexible, easy to fit on various pipes and fit tightly to their circumference, while the 8mm-12mm thick rubber and plastic sponge 92 provides sufficiently high thermal resistance to prevent heat loss; and the rubber and plastic sponge 92 at this thickness has a certain buffering and shock absorption function, which can protect the internal pipes from vibration and potential impact damage.

[0028] In this embodiment, the rubber-plastic sponge 92 is made of nitrile rubber and polyvinyl chloride. The rubber-plastic sponge 92 made of nitrile rubber and polyvinyl chloride has good heat resistance and cold resistance, which allows the rubber-plastic sponge 92 to withstand the high temperature environment of the engine and remain flexible and non-brittle in extremely cold weather without significant changes in performance, thus achieving a good heat preservation effect.

[0029] In this embodiment, the connecting pipe 2 includes a straight pipe 21 and a bend 22. The straight pipe 21 and the bend 22 are connected, and the inner wall of the straight pipe 21 is tangent to the inner wall of the bend 22. This prevents water from accumulating in the bend 22 after oil-gas separation when the engine is located on a slope, which would cause the water accumulated in the bend 22 to freeze in extremely cold weather, thus reducing the risk of system freezing.

[0030] In this embodiment, the ratio of the bending radius D of the bend 22 to the inner diameter R of the straight pipe 21 is 2. At this ratio, the flow resistance and concentrated stress in the bend 22 of the connecting pipe 2 are minimized, effectively extending the service life of the connecting pipe 2.

[0031] In this real-time example, an external pipe 6 below the return oil pipe 7 is provided with a mounting bracket 10. The mounting bracket 10 is detachably mounted on the cylinder body 4. The mounting bracket 10 is provided with a mounting hole, and a fastening bolt is provided in the mounting hole. The fastening bolt passes through the mounting hole and is threadedly connected to the cylinder body 4, thereby mounting the external pipe 6 on the cylinder body 4.

[0032] In this embodiment, one end of the external pipe 6 extends downward to the bottom of the cylinder body 4, and the return pipe 7 bypasses the external pipe 6 and connects to the cylinder body 4. The outer wall surface of the return pipe 7 is in contact with the outer wall surface of the external pipe 6. The arrangement of the return pipe 7 bypassing the external pipe 6 can avoid positional interference between the return pipe 7 and the external pipe 6. Furthermore, the contact between the return pipe 7 and the outer wall surface of the external pipe 6 can help fix the external pipe 6, further improving the stability of the external pipe 6.

[0033] The above description is only a preferred embodiment of the present utility model. It should be noted that for those skilled in the art, several modifications and improvements can be made without departing from the structure of the present utility model. These modifications and improvements will not affect the effectiveness of the present utility model or the practicality of the patent.

Claims

1. A crankcase ventilation piping system for preventing water accumulation and icing, comprising a cylinder block (4), a cylinder head (3) on the top of the cylinder block (4), and a cylinder head cover (1) on the top of the cylinder head (3), characterized in that, The cylinder head cover (1) is equipped with a labyrinth-type breather, and the cylinder body (4) is equipped with an external oil-gas separator (5). A connecting pipe (2) is provided between the cylinder head cover (1) and the external oil-gas separator (5). The bottom of the external oil-gas separator (5) is equipped with a return oil pipe (7). An external pipe (6) is provided on the cylinder body (4) on one side of the external oil-gas separator (5). The connecting pipe (2), the external pipe (6), and the return oil pipe (7) are all fitted with a heat insulation structure. The heat insulation structure includes a rubber tube layer (8) and a heat insulation layer (9). The heat insulation layer (9) is fitted on the rubber tube layer (8). The rubber tube layer (8) is fitted on the connecting pipe (2), the external pipe (6), and the return oil pipe (7). The bends of the connecting pipe (2) are all arc transition structures. The external oil-gas separator (5) is wrapped with a heat insulation layer (9).

2. The crankcase ventilation duct system for preventing water accumulation and icing according to claim 1, characterized in that, The external oil-gas separator (5) is made of engineering plastic, specifically PA6+GF30.

3. The crankcase ventilation duct system for preventing water accumulation and icing according to claim 1, characterized in that, The insulation layer (9) includes heat shrink tubing (91) and rubber-plastic sponge (92). The heat shrink tubing (91) is sleeved on the rubber tube layer (8), and the rubber-plastic sponge (92) is sleeved on the heat shrink tubing (91).

4. The crankcase ventilation duct system for preventing water accumulation and icing according to claim 3, characterized in that, The thickness of the heat shrink tubing (91) is 0.5mm-1.5mm, and the thickness of the rubber-plastic sponge (92) is 8mm-12mm.

5. A crankcase ventilation duct system for preventing water accumulation and icing according to claim 4, characterized in that, The rubber-plastic sponge (92) is composed of nitrile rubber and polyvinyl chloride.

6. The crankcase ventilation duct system for preventing water accumulation and icing according to claim 1, characterized in that, The connecting pipe (2) includes a straight pipe (21) and a bent pipe (22), the straight pipe (21) and the bent pipe (22) are connected, and the inner wall of the straight pipe (21) is tangent to the inner wall of the bent pipe (22).

7. A crankcase ventilation duct system for preventing water accumulation and icing according to claim 6, characterized in that, The ratio of the bending radius D of the bend (22) to the inner diameter R of the straight pipe (21) is 2.

8. The crankcase ventilation duct system for preventing water accumulation and icing according to claim 1, characterized in that, An mounting bracket (10) is provided on the external pipe (6) below the oil return pipe (7), and the mounting bracket (10) is detachably mounted on the cylinder body (4).

9. A crankcase ventilation duct system for preventing water accumulation and icing according to claim 8, characterized in that, One end of the external pipe (6) extends downward to the bottom of the cylinder body (4), the oil return pipe (7) bypasses the external pipe (6) and connects to the cylinder body (4), and the outer wall surface of the oil return pipe (7) is in contact with the outer wall surface of the external pipe (6).

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