JPH0417214Y2 - - Google Patents

Description

[Detailed Description of the Invention] (Industrial Application Field) This invention relates to a separation device for reliably separating oil contained in blow-by gas leaking into the crankcase of an engine.

(Prior art) Until now, as a device for separating oil from blow-by gas leaking into the engine crankcase, an expanded oil sump chamber has been provided in the middle of a mist pipe connected to the crankcase. A fan that rotates with the discharge flow of blow-by gas is installed in the oil sump chamber, and the oil sump chamber is opened to a mist pipe around the fan, and the outer bottom of the oil sump chamber is connected to the crankcase by an oil return pipe. A system in which a circular casing was installed in the middle of the pipe connecting the engine's breather hole and the air cleaner or intake manifold was proposed in Utility Model Application Publication No. 54-94414. A rotary blade made of a paddle-shaped plate piece is provided, and a filter member layer and an oil reservoir are provided on the outer periphery of the rotor blade.
A device in which this oil reservoir chamber is connected to an oil pan via a drain is known from Utility Model Application No. 56-25009.

(Problem to be solved by the invention) By the way, in the former of the above-mentioned conventional devices, the oil adhering to the surface of the fan installed in the middle of the mist pipe is simply splashed outward, and the fan is made of metal. Or it is a hard one made of plastic plate material, and it holds a small amount of oil.
Since the fan is rotated by the gas flow, the gas and the fan rotate together, and there is hardly any expected collision effect between the two, and the oil separation effect is small. The rotor blades are rotated by external power, but since the rotor blades are made up of several paddle-shaped plate pieces, the amount of oil held by the blades is small, as in the former case, and the gas that flows into the casing is transferred between the blades and the rotor blades. Since the gas is moved toward the outlet while being held between the blades, there is little chance of collision between the gas and the blades, and the oil aggregation function is small and the separation effect is not high.

Therefore, this invention provides an oil separation device in which the amount of oil held by the rotating body is increased and the blow-by gas collides across the rotating body to increase the oil capture rate and improve the separation effect. It is something.

(Means and effects for solving the problem) Based on the above-mentioned purpose, this invention is a device for separating oil contained in blow-by gas. An element body is provided, the lower end center portion of the element body is connected to the rotating shaft of the motor, the upper end center portion is rotatably supported on the upper wall of the case, and the inside of the element body is communicated with the outlet pipe. When the engine is operating, blow-by gas leaking into the crankcase flows into the case from the side through the inlet pipe,
It collides with the porous element body that rotates at high speed, moves across it from the inside, enters the cylindrical shaft of the rotating shaft through the through hole, and from there flows to the intake pipe side via the outlet pipe.

During this time, oil particles contained in the gas are captured on the surface and internal structure of the porous element body, and these particles sequentially aggregate and grow in size, and are scattered outward by the centrifugal action of the rotating element body and reach the bottom of the case. get together.

(Embodiment) An embodiment of this invention will be described with reference to the drawings. In FIGS. 1 and 2, reference numeral 1 is a cylindrical case consisting of a cylindrical body 1a and a bottom wall 1b. An inlet pipe 2 extending laterally is connected to a part of the peripheral wall of the shaped main body 1a, and a boss portion 1c that projects upward is provided at the center of the upper wall.
The base of the outlet pipe 3 is attached so as to surround c.

An annular porous element body 4 is disposed inside the case 1, and the porous element body 4 is made of a layered wire mesh, a spiral shape, a collection of still wool or palm locks, or a metal It is composed of a porous annular material 4a such as a porous body, a porous ceramic body, a porous resin body, and circular end plates 4b attached to the upper and lower surfaces of the material. It is fixed to the cylindrical shaft part 5a of the shaft 5, and the cylindrical shaft part 5a has a plurality of through holes 5b at the lower part and is open at the upper end to communicate with the inside of the outlet pipe 3, and is connected to the upper wall boss of the cylindrical body 1a. It is rotatably supported by the portion 1c via a cylindrical bearing member 6a, and the portion of the rotating shaft 5 below the cylindrical shaft portion 5a is connected to the bottom wall 1b provided with the drain pipe 7 via another bearing member 6b. It is supported and its lower end is connected to a motor m. Furthermore, the cylindrical main body 1a
A retaining ring 8 for preventing the bearing member 6a from coming off is provided between the upper end surface and the mounting base of the outlet pipe 3.

As shown in Fig. 3, the case ₁ is mounted on the cylinder head cover C of the engine E via a bracket b1, and the motor m is mounted on the side of the head cover C by another bracket _b2 , and the inlet pipe 2 is connected to the inside of the head cover C by a hose member _h1 , the outlet pipe 3 is connected to the air cleaner AC or the intake pipe K by another hose member _h2 , and the drain pipe 7 attached to the bottom wall 1b is connected to the hose. Connected to oil pan O by member _h3 .

However, this is just one example, and the case 1 may be attached to the crankcase side and the inlet pipe 2 may be communicated therewith.

With the above configuration, when the engine E is operating, the pressure in the central part of the cylindrical case 1, which communicates with the intake pipe through the outlet pipe 3, is lower than atmospheric pressure, while the pressure inside the crankcase is slightly higher than atmospheric pressure. As a result, the blow-by gas leaking into the crankcase enters the cylinder head cover C through the vertical pipe P, passes through the hose member _h1 and the inlet pipe 2, and enters the case 1 from the side as shown by the arrow.
It begins to flow inside.

The inside of the case 1 contains a porous element body 4.
Since the rotary shaft 5 is connected to the outlet pipe 3 only through the cylindrical shaft portion 5a, the blow-by gas flowing into the case 1 crosses the porous element body e and flows toward the outlet pipe 3.

If the porous element body 4 is rotated in either the left or right direction at a high speed (approximately 3000 rpm to 5000 rpm) in this state, the blow-by gas flowing into the case 1 will always form a new surface around the porous element body 4. It crosses the inside of the porous element body 4 while increasing the contact area in the circumferential direction while colliding with each other,
Therefore, oil particles contained in the gas are captured and separated by the peripheral surface and internal structure of the porous element body 4, and the gas from which the oil has been separated comes out from the through hole 5b to the cylindrical shaft portion 5a. It flows into the intake pipe through the outlet pipe 3.

During this time, the oil particles captured on the peripheral surface and internal structure of the porous element body 4 gradually aggregate and grow in size, and due to the centrifugal force of the rotating element body 4, they sequentially move to the surrounding area and fly away from the peripheral surface. It scatters and adheres to the case wall surface, then flows down into the drain groove of the bottom wall 1b and is returned to the oil pan O through the drain pipe 7.

(Effects of the invention) As described above, this invention uses an inlet pipe on the peripheral wall as a separator for oil in blow-by gas.
A porous element body is disposed in a case having an outlet pipe at the center of the upper wall, the lower end center of this element body is connected to the rotating shaft of the motor, and the upper end center is rotatably supported on the upper wall of the case. At the same time, the inside of the element body is communicated with the outlet pipe, so the blow-by gas flowing into the case always crosses the porous element body, preventing tangling with the rotating element body and making the blow-by gas more effective. It can be made to collide with the element body,
The oil in the gas can be reliably captured not only on the surface of the material but also by the internal structure, and the oil separation effect can be improved.

[Brief explanation of drawings]

FIG. 1 is a sectional view of an embodiment of this invention. Figure 2 is its plan view. FIG. 3 is a side view showing the state in which it is used. In the figure, 1... Case, 1a... Cylindrical body, 1b
... Bottom wall, 2 ... Inlet pipe, 3 ... Outlet pipe, 4 ... Porous element body, 4a ... Material, 4
b...End plate, 5...Rotating shaft, 5a...Cylinder shaft portion, 6
a, 6b...Bearing member, 7...Drain pipe.

Claims (1)

[Scope of utility model registration request] A porous element body 4 is disposed in a case 1 having an inlet pipe 2 on the peripheral wall and an outlet pipe 3 at the center of the upper wall. is rotatably supported on the upper wall of a case 1, and the inside of an element body 4 is communicated with an outlet pipe 3.