JPH05240022A - Device for eliminating oil in blow-by gas - Google Patents

Abstract

PURPOSE:To eliminate oil in blow-by gas by separating gas from liquid effectively, in a limited space in an engine. CONSTITUTION:A device for eliminating oil in blow-by gas has a PCV room 2 provided with a gas-liquid separating device which consists of a gas passage 4 partitioned alternately by a plurality of bulkhead plates 3. A wind mill device 10 provided with an impeller 11 covered with a truncated one shaped outer cylinder 12 whose front passage area is narrowed down in a taper shape, is installed in the gas passage inlet 6 of the PCV room 2.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an oil removing device for blow-by gas of an engine.

[0002]

2. Description of the Related Art Conventionally, a PCV (Positive Crankcase Ventila) is used to burn blow-by gas leaking from a combustion chamber into an engine crankcase without releasing it into the atmosphere.
The blow-by gas is returned from the crankcase to the intake system by the combustion system, and the reduction and re-combustion of the blow-by gas is performed. At this time, there is an oil mist (fog-like oil) in the blow-by gas in the crankcase, and it is inconvenient to re-burn the blow-by gas, and it may cause air pollution and consume oil. Increase. Therefore, oil is separated from the blow-by gas and returned to the crankcase before the blow-by gas is returned to the intake system.

Various types of conventional oil removing devices have been devised and used. Of these, the one having a simple structure and being used relatively often is shown in FIG. FIG. 3A is a schematic view of the oil removing device viewed from the bottom with the engine cylinder head cover 1 removed from the cylinder head and lifted up, and FIG. 3B shows the mounting position of the device in the engine. FIG. As shown in the figure, P provided in the cylinder head cover 1 of the engine 20.
The CV room 2 normally removes the oil in the blow-by gas. In the PCV room 2,
In order to let blow-by gas (hereinafter also referred to as PCV gas) pass through, a gas passage 4 is formed by alternately partitioning it by a plurality of partition plates 3. The PCV gas flows into the PCV room 2 through the PCV gas inlet 6 opened in the bottom plate 5 of the PCV room (FIG. 3 [a] shows the state removed from the PCV room 2), and enters the partition plate 3 inside the PCV gas inlet 6. Along the gas passage 4
It flows in a meandering manner, exits the PCV room 2 from the PCV gas outlet 7, enters the intake system communication passage 8, and is introduced into the intake system 9. During this time, while the oil mist in the PCV gas flows along the partition plate 3, the oil adheres to the wall plate surface 3 to separate the PCV gas and the oil, and the oil collects on the upper surface of the bottom plate 5 of the PCV room. PCV gas inlet 6
Through the oil return hole (not shown) provided in the bottom plate 5, and the PCV room flows out through the cylinder head 2
It is returned to the oil sump 23 in the crankcase 22 via 1.

With the above operation, the oil is removed in the PCV room 2 and the blow-by gas separated into gas and liquid is supplied to the intake system.

[0005]

DISCLOSURE OF THE INVENTION Problems to be Solved by the Invention In the above PCV room, the oil is not sufficiently removed only by adhering the oil to the partition plate, and the oil mist in the blow-by gas is not sufficiently removed. For this reason, it is advisable to make the PCV room large, but for that reason, the number of partition plates must be increased and the overall length of the gas passage must be limited due to space constraints in the engine head cover and crankcase. It cannot take a long length.

In view of the above circumstances, it is an object of the present invention to provide a means capable of effectively separating gas and liquid in a limited space in an engine to remove oil in blow-by gas. ..

[0007]

In order to achieve the above object, in the present invention, a blow-by gas having a PCV room equipped with a gas-liquid separator comprising blow-by gas passages alternately partitioned by a plurality of partition plates. An inner oil removing device, wherein a wind turbine device comprising an impeller covered with a frustoconical outer cylinder having a tapered front passage area at a predetermined angle is attached to the blow-by gas passage inlet of the PCV room. Further, there is provided an oil removing device for blow-by gas, wherein the blow-by gas passage outlet of the PCV room is communicated with the intake system of the engine.

[0008]

The blow-by gas that has risen in the crankcase of the engine passes through the inside of the wind turbine device and flows into the PCV room. At this time, the flow of gas causes the impeller inside the wind turbine device to rotate and the outside of the impeller. A swirling motion of the air flow occurs in the cylinder, and therefore, the oil mist in the gas flow is separated from the gas by the centrifugal force and adheres to the inner wall surface of the outer cylinder. Further, the gas flow in the outer cylinder has a narrower passage area of the outer cylinder, and thus the flow velocity increases as the gas flow increases, which promotes separation of oil mist by centrifugal force.
The swirling flow of the gas flow also promotes the separation of oil mist even in the PCV room, and the separated oil flows down from the lower end of the outer cylinder of the wind turbine device and is collected in the crankcase oil sump.

[0009]

EXAMPLE FIG. 1 shows an example of the present invention. In the figure, the same parts as those in FIG. 3 are designated by the same reference numerals. 1
Is a cylinder head cover, 2 is a cylinder head cover 1
PCV room installed at 3, 3 is a gas passage partition plate in the PCV room, 4 is a gas passage in the PCV room, and 5 is a PC
The bottom plate of the V-room is schematically shown in the figure with the bottom plate 5 removed so that the shape of the gas passage 4 can be clearly seen. 6 is a PCV gas inlet into the PCV room 2, 7 is an outlet of PCV gas from the PCV room 2, and 8 is a communication passage from the outlet 7 of PCV gas to the intake system 9. The above is the same as the configuration of the conventional technique shown in FIG.

A feature of the present invention is that a wind turbine device 10 is attached to the PCV gas inlet 6 as shown in FIG. As shown in detail in FIG. 2, the wind turbine device 10 is composed of an impeller 11 and an outer cylinder 12, and the outer cylinder 12 tapers toward the gas inlet 6 of the PCV room to narrow the passage area in the cylinder. Such a truncated cone shape has a structure in which the outer wall of the impeller 11 is covered with a frustoconical shape having an inclination angle θ of about 30 degrees with respect to the axis of the inner wall of the outer cylinder. The impeller 11 is rotatably supported by a shaft 13 and a stopper 14 as shown in the drawing, and is rotated by an airflow of PCV gas flowing in the outer cylinder 12 to become a windmill and rotate. Figure 2
[A] is a perspective view of the wind turbine device 10, and FIG. 2 [b] is a sectional view thereof.

With the above structure, the blow-by gas that has risen in the crankcase of the engine passes through the wind turbine device 10 and flows into the PCV room 2. At this time, the impeller 11 rotates due to the flow of gas, A swirling motion is generated in the air flow inside the outer cylinder 12. Therefore, the oil mist in the gas flow is separated from the gas by the centrifugal force and adheres to the inner wall surface of the outer cylinder 12. As the flow of the gas G in the outer cylinder rises in the outer cylinder, the passage area becomes narrower, so that the flow velocity increases, which in turn increases the centrifugal force and promotes the separation of oil mist, and the gas flow becomes PCV room. Before the entry, the oil L is considerably separated from the PCV gas, and then enters the gas passage 4 of the PCV room 2, where the gas-liquid separation is performed by the partition plate 3 as described above. In addition, the wind turbine device 10
As a result, the gas G in the PCV room flows in the gas passage 4 while making a swirling motion, and a large amount of oil L easily adheres to the partition plate due to the centrifugal force.

The oil L adhering to the partition plate 3 as described above is accumulated in the bottom plate 5 of the PCV room 2, and together with the oil L adhering to the inner wall of the outer cylinder of the wind turbine device 10, as shown in FIG. It flows down into the crankcase 22 from the lower end or through an oil return hole (not shown) provided in the bottom plate 5 through the cylinder head 21, and is returned to the oil sump 23. On the other hand, the PCV gas from which oil mist has been removed is
The PCV gas exit 7 passes through the intake system communication passage 8 and flows into the intake system 9.

As described above, by attaching the wind turbine device 10 to the inlet of the conventional PCV room 2, it is possible to extremely efficiently remove the oil in the PCV gas, and the device required therefor has a simple structure. It is easy to handle and cost effective.

[0014]

The following effects can be obtained by implementing the present invention. (1) The oil in the blow-by gas is efficiently removed,
Oil consumption is saved. (2) The amount of oil entering the combustion chamber of the engine is reduced, and the power performance of the engine is improved.

(3) The device is simple, easy to handle, and advantageous in cost.

[Brief description of drawings]

FIG. 1 is a schematic exploded view of an apparatus for removing oil from blow-by gas according to an embodiment of the present invention.

2 shows an enlarged view of the wind turbine device shown in FIG.
2A is a perspective view thereof, and FIG. 2B is a sectional view taken along the line AA of FIG.

FIG. 3 shows an oil removing apparatus for blow-by gas according to the prior art, and FIG. 3 [a] is a schematic exploded view thereof.
[B] is a layout showing the mounting position of the device in the engine.

[Explanation of symbols]

 2 ... PCV room 3 ... Partition plate 4 ... Gas passage 5 ... Bottom plate 6 ... Blow-by gas passage inlet 7 ... Blow-by gas passage outlet 9 ... Intake system 10 ... Wind turbine device 11 ... Impeller 12 ... Outer cylinder 21 ... Cylinder head G ... Blow-by Gas L ... Oil

Claims (1)

[Claims] 1. A device for removing oil in blow-by gas, comprising a PCV room (2) having a gas-liquid separating device comprising blow-by gas passages (4) alternately partitioned by a plurality of partition plates (3). At the blow-by gas passage inlet (6) of the PCV room (2), there is an impeller (11) covered with a frustoconical outer cylinder (12) having a tapered front passage area at a predetermined angle. A device for removing oil in blow-by gas, characterized in that a wind turbine device (10) is mounted and a blow-by gas passage outlet (7) of the PCV room (2) is communicated with an intake system (9) of an engine.