JPH0627781Y2 - Blow-by gas processing equipment - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial field of application) The present invention relates to a processing device for separating oil in blow-by gas generated in an engine and returning the gas to the intake side again.

(Prior Art) Generally, in a vehicle engine, in order to prevent air pollution, the blow-by gas generated in the crankcase is not released to the outside, and the oil mist contained therein is separated and returned to the intake passage. However, as the processing device, as shown in FIG. 5 (a), the impeller a is rotatably mounted in the empty space in the cylinder cover C of the engine, and the impeller a is installed by the blow-by gas flowing from the crankcase. While rotating, the centrifugal action separates the oil particles contained in the gas and returns them to the oil pan through the drain,
The oil-removed gas was returned to the intake passage q through the outlet pipe P, which was proposed by Japanese Utility Model Laid-Open No. 58-183919, and provided separately from the cylinder cover C as shown in FIG. An impeller a is arranged in the container b, and it is positively rotated by a motor m installed on the engine.
According to Japanese Utility Model Application Laid-Open No. 57-193913, the centrifugal action removes the oil in the gas and sends the treated gas to the air cleaner Ac side.

Furthermore, the processing case is divided by a partition wall into a chamber connected to the engine intake system and a chamber connected to the crankcase, and a rotary shaft is installed in the center of the case so as to span both chambers, and the intake system of the rotary shaft While the impeller is installed in the part of the room that connects, the impeller is installed in the part of the room that connects to the crankcase, and the impeller is rotated by the air flowing in from the intake inlet at one end of the case, and the rotating shaft and the impeller are rotated. Blow-by gas is taken in from above one side of the chamber connected to the crankcase, and the air in the blow-by gas is made to flow axially to separate the oil in the gas by means of an impeller. .

(Problems to be solved by the invention) By the way, in the first conventional device described above, the impeller a for oil separation is rotated by the blow-by gas generated in the crankcase, but this occurs in the crankcase of the vehicle engine. The amount of blow-by gas generated is about 30-
At about 40 / min, the flow rate is insufficient to rotate the impeller a at a high speed, and the rate of gas circling with the impeller a is high, an appropriate collision effect cannot be obtained, and the oil separation effect is low. is there. In the second type, the impeller a for separating oil is used.
Since it is positively rotated by external power, considerable centrifugal effect and collision effect can be expected, but an expensive motor is required, and the motor must be installed close to a hot engine, and its durability is a problem. There is. Furthermore, the third type uses an impeller that rotates by intake air to the engine to rotate the impeller, so there is an advantage that an expensive motor is not required, but the blow-by gas taken from above one side of the impeller is rotated. Since it is made to flow to the opposite end side of the case along the axial direction of the shaft, there is little impact effect on the impeller and trapping effect of oil particles, and the ratio of passing through the room with gas without being separated by oil particles Has the drawback of being high.

Therefore, an object of the present invention is to provide a blow-by gas treatment device which does not require an expensive motor and has sufficient collision and trapping effects for oil separation and prevents oil from passing through. To do.

(Means and Actions for Solving Problems) Based on the above object, the present invention provides a blow-by gas treatment device in which a rotary shaft is rotatably supported by a case having at least an element chamber and one end of the rotary shaft is supported. Is equipped with an impeller and is composed of a porous annular material or a large number of vertically opposed pin members at the other end of the case, at least the peripheral side surface and the lower surface are close to the inner surface of the case, and the central portion of the lower surface is open. While the element body is mounted and the impeller is arranged so as to be rotated by the intake air to the engine, a blow-by gas intake pipe is provided at one side of the element chamber, and the inflow direction of the blow-by gas is the element body. It is characterized in that it is continuously provided in a tangential direction so as to oppose to the direction of the peripheral speed, and a return pipe communicating with the inside of the center of the element body is continuously provided at the central portion of the lower wall. Yes, a considerable amount of outside air is sucked in through the air cleaner when the engine operates, and the impeller and the element body are rotated at high speed by the sucked air, and at the same time, blow-by gas generated inside the engine by suction negative pressure is passed through the intake pipe to the element. It flows tangentially into the room and vigorously collides with the element body from the side, and while traversing the element body in the radial direction, the oil particles contained in the gas are captured by the element body and the blow-by gas from which the oil has been removed returns. The oil returned to the intake passage by the pipe and trapped in the element body is scattered around by the centrifugal force of the element body and returned to the oil pan through the drain pipe.

(Embodiment) FIG. 1 to FIG. 3 show an embodiment of the present invention, in which 1 is a housing case for a rotating body, the inside of which is for a bearing as shown in FIG. It is divided into an upper impeller chamber 10a and a lower element chamber 10b by a partition wall 1a equipped with a boss 1b, and the center boss 1b has a rotating shaft 2 in which upper and lower ends project into both chambers 10a, 10b. The impeller 3 composed of several vane plates 3a is attached to the end of the non-circular cross section in the impeller chamber 10a, and the non-circular cross section in the element chamber 10b is supported. A porous annular element body 4 whose peripheral side surface and lower surface are close to the inner surface of the case 1 is attached to the end portion of the.

The porous element body 4 is formed by laminating wire mesh, wound in multiple layers, combined still wool or palm rock, or has a bearing sleeve on the upper surface of a porous annular member 4a such as a metal porous body or a ceramic porous body. An integral end plate 4b is formed by providing an annular end plate 4c on the lower surface, and one side of the impeller chamber 10a of the case 1 is connected to an air cleaner Ac by an inlet pipe 5a. Communicated with the outlet of the air cleaner Ac,
The other side is connected to the middle of the intake passage 5 by the outlet pipe 5b.

Further, one side of the element chamber 10b is communicated with the upper surface of the cylinder cover C by an intake pipe 6a arranged in a tangential direction so as to face the circumferential direction of the element body 4, and the central portion of the lower wall is returned to the return pipe 6b. As a result, in the case of a gasoline engine, it communicates with the downstream position of the throttle valve, and in the case of a diesel engine, it communicates with a proper position near the engine.

Therefore, if the engine is operated, a considerable amount (2000-30
Air (about 00 / min) is sucked in through the air cleaner Ac, and a part of the air is branched by the inlet pipe 5a to form the case 1
Of the impeller 3 and the element body 4 at high speed (3000
(About 4000 rpm) and in the direction of the arrow in Fig. 3B.

On the other hand, the blow-by gas generated in the crankcase is guided from the inside of the cylinder cover C through the intake pipe 6a by the gas pressure of itself and the negative suction pressure acting on the element chamber 10b through the return pipe 6b. It will flow in the tangential direction of the element chamber 10b facing the direction of speed.

Therefore, the blow-by gas collides with the porous element body 4 having a large relative velocity with respect to the element body 4, and traverses this in the radial direction to the inside of the element body 4 to flow through the return pipe 6b and the intake passage 5 Returned to.

In the process, the oil particles contained in the gas are not only trapped by the surface of the element body 4, but also penetrate deep inside the element body 4 and are reliably trapped by the porous internal structure. The gas from which the oil particles have been sufficiently removed flows out inside the element body 4 and returns to the return pipe 6b.
Oil particles captured by the element body 4 gradually increase from the inlet to the intake passage 5 side and gradually move to the peripheral side by the centrifugal force action of the element body 4 rotating at high speed. It scatters from the peripheral surface and flows down while adhering to the inner wall surface and returned to the oil pan through the drain pipe.

FIG. 4 shows a modified example of the element body 4, in which the upper end plate 4b and the lower end plate 4c are made of synthetic resin, and instead of the porous material 4a, the inner surface is changed from the peripheral portion to the central portion. A large number of pins 4d having different heights are provided facing each other, and the blow-by gas flowing in from the intake pipe 6a is passed vertically and horizontally from the peripheral portion toward the central portion to form a zigzag pattern with the element body 4. The collision effect and the trapping effect are obtained.

Further, the impeller chamber 10a of the case 1 is omitted, and the impeller 3 is disposed so as to be directly exposed inside the air cleaner Ac,
It does not matter if this is rotated by the intake air.

(Effect of the Invention) As described above, in the present invention, as a blow-by gas treatment device, a rotating shaft is rotatably supported by a case having at least an element chamber, and an impeller is attached to one end of the rotating shaft and the inside of the case At the other end, an element body made of a porous annular material or a large number of vertically opposed pin members, at least the peripheral side surface and the lower surface of which are close to the inner surface of the case and whose central portion of the lower surface is opened, is mounted. The impeller is arranged so as to be rotated by intake air to the engine, while a blow-by gas intake pipe is provided at one side of the element chamber so that the inflow direction of the blow-by gas faces the direction of the peripheral velocity of the element body. Since the return pipe that connects to the center of the lower wall is connected to the center of the lower wall, an expensive motor can be used to rotate the element. It is possible to rotate the element body at high speed without needing it, and since the inflow direction of the blow-by gas is opposite to the circumferential speed direction of the element body, the blow-by gas generated in the engine is directed to the element body. It can be violently collided with a large relative velocity and can be traversed in the radial direction, and is contained in blow-by gas due to a large impact effect on the element body and a positive trapping effect by the internal tissue or the internal pin member accompanying the crossing. The oil particles can be efficiently separated, and the passage of the oil particles can be appropriately prevented.

[Brief description of drawings]

 FIG. 1 is a circuit side view of this device. FIG. 2 is an enlarged sectional view of the main part thereof. FIG. 3A is a plan view taken along the line XX in FIG. 2B is a plan view taken along the line YY of FIG. FIG. 4 is a sectional view of a modification of the element body. 5A and 5B are schematic side views of the conventional device. In the figure, 1 ... Case, 1a ... Partition wall 1b ... Boss, 2 ... Rotating shaft 3 ... Impeller, 4 ... Element body 4a ... Material, 4b, 4c ... End plate 4d ... Pin, 5 ... Intake passage 6a ... Intake pipe, 6b ... Return pipe Ac ... Air cleaner, C ... Cylinder cover

Claims (1)

[Scope of utility model registration request] 1. A rotary shaft is rotatably supported by a case having at least an element chamber, and an impeller is attached to one end of the rotary shaft, and a porous annular material or vertically facing the other end in the case. An element body having a large number of pin members, at least the peripheral side surface and the lower surface of which are close to the inner surface of the case and whose central portion of the lower surface is open, is mounted, and the impeller is arranged so as to be rotated by intake air to the engine A blow-by gas intake pipe is connected to one side of the element chamber in a tangential direction such that the inflow direction of the blow-by gas faces the direction of the peripheral velocity of the element body. Blow-by gas processing device with a series of return pipes leading to the center of the.