Crankcase respirator

Abstract

A crankcase breather comprises a shell, an oil-gas separation cavity is formed in the shell, a first ventilation opening is formed in the bottom wall of the shell, a barrel is fixedly arranged at the position, corresponding to the first ventilation opening, of the inner side of the bottom wall, an end cover covers an end opening of the upper end of the barrel and is fixedly connected with the end opening of the upper end of the barrel, and a through hole is formed in the end cover; a first baffle and a second baffle are fixedly arranged in the oil-gas separation cavity, the first baffle is close to the end cover, and the first baffle blocks the through hole; a second air vent is formed in the middle of the side wall of the shell, and the second baffle is close to the second air vent and shields an inner end opening of the second air vent; and a liquid outlet is formed in the bottom of the shell. The first ventilation opening extends to the middle of the oil-gas separation cavity through the cylinder body, so that oil-gas mixed gas collides with the first baffle and the second baffle to change the direction, oil drops in the oil-gas mixed gas are separated from gas after coalescence, the oil-gas separation efficiency is improved, the space utilization rate is increased, and the size of the oil-gas separator is reduced.

Description

Technical Field

[0001] The utility model relates to a crankcase fitting, in particular to a crankcase breather. Background Art

[0002] When the engine is working, more or less of the high-pressure combustible mixture and the burned gas in the combustion chamber will leak into the crankcase through the gap between the piston group and the cylinder, causing blow-by. As the amount of blow-by increases continuously, the pressure of the engine crankcase will increase. Therefore, a breather is installed on the crankcase to discharge the blow-by gas to reduce the pressure of the engine crankcase. In the prior art, the oil-gas separation structure of the breather is generally a labyrinth type and a swirl type, and these structures are relatively large in volume and not convenient for compact installation. Content of the Utility Model

[0003] Aiming at the problems in the prior art, the utility model provides a crankcase breather, aiming to simplify the structure of the breathing valve and reduce its volume.

[0004] A crankcase breather includes a housing. An oil-gas separation chamber is arranged in the housing. A first ventilation port for allowing the oil-gas mixture to pass through is arranged on the bottom wall of the housing. A cylinder body is fixedly arranged at a position corresponding to the first ventilation port on the inner side of the bottom wall. The lower end of the cylinder body is communicated with the first ventilation port and is sealed between them. The upper end port of the cylinder body is covered with and fixedly connected to an end cover. A through hole for allowing the oil-gas mixture to pass through is opened on the end cover. A first baffle and a second baffle are fixedly arranged in the oil-gas separation chamber. The first baffle is close to the end cover and blocks at the through hole and is used for changing the flow direction of the oil-gas mixture. A second ventilation port for allowing gas to pass through is opened in the middle of the side wall of the housing. The second baffle is close to the second ventilation port and blocks at the inner end port of the second ventilation port. The second baffle is located between the cylinder body and the second ventilation port. A drain port for discharging the oil liquid accumulated at the bottom of the oil-gas separation chamber is arranged at the bottom of the housing.

[0005] Further: The first baffle is made of fiber material.

[0006] Further: The first baffle is fixed on the top wall of the housing by ultrasonic welding.

[0007] Further: The second baffle is in a C-shaped structure and is arranged around the cylinder body. The second ventilation port corresponds to the middle of the second baffle.

[0008] Further: The second baffle is integrally injection-molded on the top wall of the housing.

[0009] Further: A gas passing gap for allowing air flow to pass through is left between the second baffle and the side wall of the housing.

[0010] Further, the housing includes a lower trough body and an upper cover body which are arranged in butt joint. The upper cover body is of a circular structure or a square structure. A misalignment prevention gap is left between the lower side edge of the second baffle and the bottom surface of the lower trough body. A misalignment prevention bump is fixedly arranged on the bottom surface inside the lower trough body. The height of the misalignment prevention bump is greater than the height of the misalignment prevention gap. The misalignment prevention bump is used to abut against and block the second baffle from approaching the bottom surface of the lower trough body when the second baffle is not installed at the second ventilation port.

[0011] Further, the first ventilation port is located in the middle of the bottom wall. A sunken groove is arranged on the inner wall of the bottom wall. The sunken groove is annular and arranged around the cylinder body. The liquid discharge port is directly communicated with the sunken groove.

[0012] Further, joints are fixedly arranged on the outer end ports of the first ventilation port, the second ventilation port and the liquid discharge port.

[0013] Further, vertical flow disturbing bumps are distributed on the outer circumference of the cylinder body.

[0014] The beneficial effects of the present utility model are as follows: The first ventilation port extends to the middle of the oil-gas separation cavity through the cylinder body, which is convenient for the oil-gas mixed gas to collide and change direction with the first baffle and the second baffle, so as to facilitate the coalescence of oil droplets in the oil-gas mixed gas and the separation from the gas, and further improve the efficiency of oil-gas separation. At the same time, the use of maze-type and swirl-type structures is avoided, the space utilization rate is improved, and the volume of the present utility model is reduced. Description of the Drawings

[0015] Figure 1 is the structural schematic diagram of the present utility model;

[0016] Figure 2 is the first sectional structural schematic diagram of the present utility model;

[0017] Figure 3 is the second sectional structural schematic diagram of the present utility model. Detailed Embodiment

[0018] The present utility model will be described in detail below with reference to the drawings. The embodiments of the present utility model will be described in detail below. The examples of the embodiments are shown in the drawings, wherein the same or similar reference numerals represent the same or similar elements or elements with the same or similar functions from beginning to end. The embodiments described below by referring to the drawings are exemplary and are only used to explain the present utility model, and cannot be construed as a limitation of the present utility model. The orientation terms such as left, middle, right, up, and down in the embodiments of the present utility model are only relative concepts to each other or are referenced based on the normal use state of the product, and should not be considered as restrictive.

[0019] A crankcase breather includes a housing 1, as Figure 1 and Figure 2As shown, a fixed ear plate 11 is fixedly connected to the bottom of the outer wall of the housing 1. An oil-gas separation chamber is provided inside the housing 1. A first vent hole 13 for allowing the oil-gas mixture to pass through is provided on the bottom wall of the housing 1. A cylinder 2 is fixedly provided on the inner side of the bottom wall corresponding to the position of the first vent hole 13. The lower end of the cylinder 2 communicates with the first vent hole 13 and is hermetically arranged therebetween. The upper end port of the cylinder 2 is covered with and fixedly connected to an end cap 21. A through hole 211 for allowing the oil-gas mixture to pass through is provided on the end cap 21. Vertical turbulence bumps 22 are distributed on the outer circumference of the cylinder 2. The cross section of the turbulence bump 22 is semicircular. A first baffle 3 and a second baffle 17 are fixedly provided in the oil-gas separation chamber. The first baffle 3 is close to the end cap. The first baffle 3 blocks at the through hole 211 and is used to change the flow direction of the oil-gas mixture. The first baffle 3 is made of fiber material, preferably filter paper, to further improve the coalescence efficiency of oil droplets in the oil-gas mixture. The first baffle 3 is preferably fixed to the top wall of the housing 1 by ultrasonic welding, so as to facilitate production and assembly. In other embodiments, the first baffle 3 can also be fixedly connected to the end cap 21, the cylinder 2 or the bottom wall through a connecting frame (not shown). A second vent hole 14 for allowing gas to pass through is provided in the middle of the side wall of the housing 1. The second baffle 17 is close to the second vent hole 14 and blocks at the inner end port of the second vent hole 14. A gas passing gap for allowing air flow to pass through is left between the second baffle 17 and the side wall of the housing 1. The second baffle 17 is located between the cylinder 2 and the second vent hole 14 and is used to prevent the air flow whose direction is changed by the first baffle 3 from directly entering the second vent hole 14. A drain port 12 for discharging the oil liquid accumulated at the bottom of the oil-gas separation chamber is provided at the bottom of the housing 1. The second baffle 17 is of a C-shaped structure and is arranged around the cylinder 2. The second vent hole 14 corresponds to the middle of the second baffle 17. The second baffle 17 is preferably integrally injection molded on the top wall of the housing 1. In other embodiments, the second baffle 17 can also be fixedly connected to the bottom wall.

[0020] Among them, in combination Figure 3As shown, the housing 1 includes a lower trough body 16 and an upper cover body 15 which are butt-jointed. The upper cover body 15 is of a circular structure or a square structure. There is an anti-misalignment gap between the lower side edge of the second baffle 17 and the bottom surface of the lower trough body 16. An anti-misalignment bump 18 is fixedly arranged on the bottom surface inside the lower trough body 16. The height of the anti-misalignment bump 18 is greater than the height of the anti-misalignment gap. The anti-misalignment bump 18 is used to abut against and block the second baffle 17 from approaching the bottom surface of the lower trough body 16 when the second baffle 17 is not installed at the second vent 14, so as to facilitate the rapid assembly of the lower trough body 16 and the upper cover body 15 and avoid misinstallation. The first vent 13 is located in the middle of the bottom wall. A sunk groove 161 is arranged on the inner wall of the bottom wall. The sunk groove 161 is annular and arranged around the cylinder body 2. The drain port 12 is directly communicated with the sunk groove 161 to facilitate the discharge of the oil liquid. Connectors are fixedly arranged on the outer end ports of the first vent 13, the second vent 14 and the drain port 12. Among them, the connectors of the first vent 13 and the second vent 14 are quick-connect joints, and an O-ring is embedded on the outer circumference of the connector of the drain port 12.

[0021] During operation, after the oil-gas mixture gas entering the oil-gas separation chamber collides with the turbulence bumps 22, the first baffle 3 and the second baffle 17, the small oil droplets in the oil-gas mixture gas collide and coalesce, that is, the small oil droplets coalesce with each other into large oil droplets. As the particle size of the oil droplets increases, under the action of gravity, they will separate from the gas. The oil liquid finally flows out from the drain port 12, and the gas is discharged from the second vent 14.

[0022] The above shows and describes the basic principles, main features and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited by the above embodiments. What is described in the above embodiments and the specification only illustrates the principles of the present invention. Without departing from the spirit and scope of the present invention, the present invention will have various changes and improvements, and these changes and improvements all fall within the scope of the present invention claimed. The scope of protection claimed by the present invention is defined by the appended claims and their equivalents.

Claims

1. A crankcase breather, comprising a housing, and an oil-gas separation chamber is arranged in the housing, characterized in that: A first vent for allowing the oil-gas mixture to pass through is provided on the bottom wall of the housing. A cylinder is fixedly arranged on the inner side of the bottom wall corresponding to the position of the first vent. The lower end of the cylinder is communicated with the first vent and is sealed therebetween. The upper end port of the cylinder is covered with and fixedly connected to an end cap. A through hole for allowing the oil-gas mixture to pass through is opened on the end cap. A first baffle and a second baffle are fixedly arranged in the oil-gas separation chamber. The first baffle is close to the end cap and blocks at the through hole and is used for changing the flow direction of the oil-gas mixture. A second vent for allowing gas to pass through is opened in the middle of the side wall of the housing. The second baffle is close to the second vent and blocks at the inner end port of the second vent. The second baffle is located between the cylinder and the second vent. A drain port for discharging the oil liquid accumulated at the bottom of the oil-gas separation chamber is arranged at the bottom of the housing.

2. The crankcase breather according to claim 1, wherein: The first baffle is made of fiber material.

3. The crankcase breather according to claim 2, characterized in that: The first baffle is fixed on the top wall of the housing by ultrasonic welding.

4. The crankcase breather according to claim 1, characterized in that: The second baffle is of a C-shaped structure and is arranged around the cylinder. The second vent corresponds to the middle of the second baffle.

5. The crankcase breather according to claim 1 or 4, characterized in that: The second baffle is integrally injection-molded on the top wall of the housing.

6. The crankcase breather according to claim 5, wherein: A gas passing gap for allowing air flow to pass through is left between the second baffle and the side wall of the housing.

7. The crankcase breather according to claim 5, wherein: The housing includes a lower trough body and an upper cover body which are butt-jointed. The upper cover body is of a circular structure or a square structure. A misalignment prevention gap is left between the lower side edge of the second baffle and the bottom surface of the lower trough body. A misalignment prevention convex block is fixedly arranged on the bottom surface in the lower trough body. The height of the misalignment prevention convex block is greater than the height of the misalignment prevention gap. The misalignment prevention convex block is used for abutting against and blocking the second baffle from approaching the bottom surface of the lower trough body when the second baffle is not installed at the second vent.

8. The crankcase breather according to claim 1, characterized in that: The first vent is located in the middle of the bottom wall. A sunk groove is arranged on the inner wall of the bottom wall. The sunk groove is annular and is arranged around the cylinder. The drain port is directly communicated with the sunk groove.

9. The crankcase breather according to claim 1, wherein: Connectors are fixedly arranged on the outer end ports of the first vent, the second vent and the drain port.

10. The crankcase breather according to claim 1, wherein: Vertical flow disturbing convex blocks are distributed on the outer circumference of the cylinder.

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