JPS63137717A - Separator of oil contained in blow-by gas - Google Patents

Abstract

PURPOSE:To obtain the title separator enhancing the trapping effect of oil by rotating a porous element body consisting of a porous annular filter material in the direction opposite to blow-by gas flowing in from the tangential direction. CONSTITUTION:A porous element body (e) consisting of both a porous annular filter medium 2 and upper and lower end plates 3a, 3b is provided to the inside of a cylindrical case 1 so that it is freely rotated with a rotary shaft 4. An inlet pipe 5 communicating with an engine is provided in the tangential direction to one side of the case 1, and an outlet pipe 6 communicating with a suction pipe side is provided to the upper wall of the case. The porous element body (e) is rotated in the direction opposite to the inflow direction of blow-by gas flowing into the case 1 from the inlet pipe 5. Therefore blow-by gas can be allowed to collide against the porous element body (e) at a large relative velocity and thereby the trapping effect of oil not only by the surface of the element body but also by the structure of the inner part can be remarkably enhanced.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a separation device for efficiently separating oil contained in blow-by gas leaking into the crankcase of an engine.

(Prior art) Until now, as a device for completely separating oil from blow-by gas leaking into the engine crankcase, there is a mist pipe connected to the crankcase as shown in Utility Model Application No. 54-94414. An expanded oil sump chamber is provided in the middle of the oil sump chamber, and a fan is installed in this oil sump chamber to be rotated by the discharge flow of the blow-by gas. The bottom of the outer periphery is connected to the crankcase by an oil return pipe, and as seen in Utility Model Application No. 56-25009, a circular casing is installed in the middle of the pipe connecting the engine's pleather hole and the air cleaner hole to the intake manifold. Inside the casing, a rotor consisting of several paddle-shaped plate pieces is provided, and a filter member layer and an oil sump chamber are provided on the outer periphery of the casing, so that the entire oil sump chamber communicates with the oil pan. What has been done is known.

(Problem to be Solved by the Invention) By the way, in the former of the above-mentioned conventional devices, the installation in the middle of the mist pipe would only serve to splash the oil adhering to the surface of the fan, and the fan would It is a hard one made of a plastic plate straddled by gold lj4, and holds a small amount of oil, and since the 7A/ is rotated by the gas flow, the gas and the fan rotate together, and there is almost no collision effect between the two. On the other hand, in the latter case, the rotor blades are rotated by external power, but since the rotor blades are made up of several paddle-shaped plate pieces, the oil separation effect is small. Since the amount of oil retained is small and the rotor blades are rotated in a direction that adapts to the flow of gas, the gas that has entered the casing is held between the blades and moved toward the outlet. As a result, there is little chance of collision between the gas and the blades, no oil aggregation occurs, and the separation function is not high.

Therefore, the object of the present invention is to increase the effect of collision between the blow pie gas and the rotary body, increase the amount of oil held by the rotary body, promote the aggregation of oil, and improve the separation effect.

(Means and operations for solving the problem) In order to achieve the above-mentioned object, the present invention provides a device for separating oil in 7' low-by gas, which includes a porous annular P material inside a cylindrical case and upper and lower ends. A porous element body made of a plate is arranged to be rotatable around a rotation axis, and an inlet pipe communicating with the engine is provided on one side of the case in a tangential direction, and an outlet pipe communicating with the intake pipe side is provided on the upper wall of the case. established.

The above-mentioned porous element body is rotated in the opposite direction to the inflow direction of the blow pie gas entering the case from the full-filling pipe.Blow pie gas leaked into the crankcase due to engine operation If it flows into the case from the inlet pipe and the porous element body is rotated, the inflow velocity of the blow pie gas and the circumferential velocity of the element body are in opposite directions, and the blow pie gas has a large relative velocity to the element body. collides with it, crosses it and enters the inside of the element body,
It flows from the outlet pipe on the upper wall to the intake pipe side. During this time, oil particles in the gas are captured not on the surface of the porous element body but in the internal structure thereof, and they gradually aggregate into large particles and are scattered outward by the centrifugal force of the rotating element body.

(Example) Embodiments of the present invention will be described below with reference to the drawings.

In FIGS. 1 and 2, l is a cylindrical case consisting of a cylindrical body 1a and a bottom wall 1b, and inside, an annular porous element body e extends around the periphery and upper surface of the cylindrical body 1a. The porous element body is arranged close to the surface and the upper wall surface, and the porous element body eμ is made of wire netting as shown in Fig. 3A. Or, as shown in the figure, a porous metal material,
Porous annular 1 material 2 such as a porous ceramic body or a porous resin body
The upper end plate 3a is provided with a plurality of window holes 3ct in the center, and the rotation axis 4 is located in the center of the top wall and bottom wall 1b of the cylindrical body 1a. The motor m is supported by a bearing provided in the motor m, extends downward, and is connected to a motor m.

An inlet pipe 5 is provided tangentially on one side of the cylindrical body 1a, and a plurality of outlet holes 7 are provided around the bearing on the upper wall.
An outlet pipe 6 is connected to the upper wall so as to surround the outlet hole 7, while a drain pipe 8 is attached to the periphery of the bottom wall 1b.

The case 71 is attached to the bracket b1 as shown in FIG.
The motor m is attached to the cylinder of the engine E on the head cover C through the cylinder, and the motor m is supported on the side of the head cover C by another bracket b2, and the inlet pipe 5 is connected to the inside of the head cover C through the horn member. On the other hand, the outlet pipe 6 is connected to the air cleaner Ac or the intake WK by a hose member h2, and the drain pipe 8 is connected to the oil pan 0 by a hose member h3. However, this is just an example, and the case 1 and the inlet pipe 5 may be attached to the crankcase side and communicated with each other.

When engine E operates under the above conditions.

A cylindrical case l that communicates with the intake pipe side through an outlet pipe 6
The pressure in the center of the crank case is lower than atmospheric pressure, while the pressure inside the crank case is slightly higher than atmospheric pressure.Then, the blow pipe gas leaks into the crank case and passes through the vertical pipe P2 to the cylinder head cover C. Insert and hose member h
1 and tangentially into the cylindrical case l through the inlet pipe 5.

Due to this combination, the porous element body 2f has a high velocity (3
000 rpm to about 5000 rpm), the direction of the inflow velocity of the blow-by gas and the direction of the circumferential velocity due to high-speed rotation of the porous element body 2 are opposite to each other at the inlet portion of the blow-by gas, as shown by the solid line arrow. The blow-by gas will not collide with the porous element body 2 with a large relative velocity, and will traverse all of this, exit into the interior of the element body 2, and flow upward.

Therefore, the oil particles contained in the gas are not only captured by the different surfaces of the porous element body 2, but also penetrate into the interior of the element body and are surely captured by its porous internal structure. Gas from which oil particles have been sufficiently removed exits into the element body 2 and flows from the outlet pipe 6 to the intake f side through the window hole 3C of the upper end plate 3a and the through hole 7 in the upper wall of the case.

On the other hand, the oil particles captured by the different surfaces and internal structure of the porous element body 2 gradually become larger and move to the surrounding side due to the centrifugal force of the rotating element body e, and are scattered from the periphery of the element body 2. , cleans the wall of the case l, falls into the drain groove on the bottom wall lb, and is returned to the oil pan 0 through the drain pipe 8.

Further, FIG. 5 shows another example, in which the upper end plate 3a of the porous element body 2 is not provided with a window hole, and the attachment of the porous element body 2 to the central rotating shaft 4 is done only partially. The upper part is a cylindrical shaft 4a with an open upper end and a plurality of through holes 4b in the lower part, and the open upper end is a cylindrical body 1a.
It is rotatably supported by a sleeve support at the center of the upper wall, and in this case, the blow-by gas flowing in from the tangential inlet pipe 5 is always passed through the porous element body 2'f: the cylinder of the rotating shaft 4. Enter the shaft 4a.

Since the oil is configured to flow out through the cylindrical shaft 4a, the oil separation function is the same as in the previous example, but as in the previous example, the porous element body 2t is large enough to be close to the inner surface of the case. It has the advantage of being easy to manufacture as it does not need to be made in any size and has no dimensional restrictions.

(Effects of the Invention) As described above, in this invention, as a device for separating oil in blow pie gas, a porous element body consisting of a porous annular P material and upper and lower trailing plates is rotated around a rotating shaft inside a cylindrical case. Arrange freely.

On one side of the case, there is an inlet pipe that communicates with the engine in a tangential direction, and on the upper wall of the case, there is a full outlet pipe that communicates with the intake pipe, and blow-by gas flows into the case from the pipe that contains the porous element body. Since it rotates in the opposite direction, the blow-by gas can collide with the porous element body at a high relative speed, which significantly improves the oil trapping effect not only on the surface of the element body but also on its internal structure. It also has a large oil holding area, which promotes coagulation and enhances the separation effect.

[Brief explanation of the drawing]

FIG. 1 is a sectional view of one embodiment of the present invention. Figure 2 is its plan view. Figure 3 A is a cross-sectional view of one different material. FIG. 4 is a side view showing the state in which it is used. FIG. 5 is a sectional view of another embodiment. In the figure,

Claims (2)

[Claims] (1) A porous element body consisting of a porous annular filter medium and upper and lower end plates is arranged inside a cylindrical case so as to be rotatable around a rotating shaft, and an inlet pipe communicating with the engine is installed on one side of the case. An outlet pipe is provided in the tangential direction and communicates with the intake pipe side on the upper wall of the case, and the porous element body is rotated in a direction opposite to the inflow direction of blow-by gas entering the case from the inlet pipe. A device for separating oil from blow-by gas, which is characterized by: (2) The above-mentioned feature that the rotary shaft includes a mounting portion of the porous element body and a cylindrical shaft above the mounting portion, so that the blow-by gas that traverses the porous element body flows out through the cylindrical shaft. A blow-by gas separation device according to claim 1.