JP2010084574A - Cyclone type oil separator - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a cyclone type oil separator suppressing the re-splashing of oil separated in a body than ever. <P>SOLUTION: Since a recessed groove 60 extending in the orthogonal or approximately orthogonal direction to the inflow direction to the body part 20 of oil-mixed gas is disposed to a sidewall inner surface 22c of the body 20, the centrifuged oil entering into the groove 60 can be flowed to an oil discharge part 50 through the most direct way or through approximately the most direct way. Compared with such a case that the centrifuged oil flows down the inside of a spiral groove, the travel of the oil to the oil discharge part 50 can be shortened to suppress the re-splashing of the oil. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a cyclonic (centrifugal) oil separator.

In an internal combustion engine, for example, an automobile engine or the like, it is assumed that discharging blowby gas that leaks from the gap between the piston ring and the cylinder wall into the atmosphere during operation will cause air pollution. A case ventilation) system is used to return to the intake system and re-burn.
By the way, the blow-by gas contains oil mist obtained by atomizing lubricating oil such as engine oil. Therefore, as means for separating and collecting oil mist in blow-by gas, an oil mist collecting device (oil separator) is provided in the inside of the cylinder head cover or in the middle of the connecting flow path connecting the crankcase and the intake pipe. Yes. As such an oil separator, a so-called cyclone type oil separator is widely used.

  A conventional cyclone type oil separator is disclosed in Patent Document 1, for example. In the oil separator disclosed in Patent Document 1, in order to suppress re-scattering of the oil centrifuged in the main body (cyclonic chamber, centrifuge chamber), in the swirl direction of the swirl flow of gas on the inner surface of the side wall of the main body. A spiral groove that descends is provided.

However, the conventional cyclone type oil separator has the following problems.
Since the centrifuged oil flows down in the spiral groove, the distance until the centrifuged oil reaches the oil discharge portion is relatively long. Therefore, there is a possibility that the centrifugally separated oil re-scatters from the spiral groove before reaching the oil discharge portion.
Japanese Patent Laid-Open No. 5-296611

  An object of the present invention is to provide a cyclonic oil separator capable of suppressing re-scattering of oil separated in a main body portion as compared with the conventional one.

The present invention for achieving the above object is as follows.
(1) the main body,
A gas introduction part that is provided on a side wall of the main body part and introduces an oil mixed gas into the main body part;
A gas discharge part that is provided on the upper wall of the main body part and discharges the gas separated from the oil mixed gas to the outside of the main body part;
An oil discharge portion that is provided at a lower end portion of the main body portion and discharges oil separated from the oil mixed gas to the outside of the main body portion;
A cyclonic oil separator that causes the oil mixed gas introduced into the main body to swirl within the main body and separates the oil from the oil mixed gas by centrifugal force due to the swirling movement,
A cyclonic oil separator, wherein a concave groove extending in a direction orthogonal or substantially orthogonal to the inflow direction of the oil mixed gas into the main body is provided on the inner surface of the side wall of the main body.

  According to the cyclonic oil separator of the above (1), since the concave groove extending in the direction orthogonal or substantially orthogonal to the inflow direction of the oil mixed gas into the main body is provided on the inner surface of the side wall of the main body. The separated oil that has entered the groove can flow to the oil discharge portion at the shortest distance or the shortest distance. Therefore, compared with the case where the centrifuged oil flows down in the spiral groove (conventional), the path through which the oil passes to the oil discharge portion can be shortened, and re-scattering of the oil can be suppressed.

Below, the cyclone type oil separator of this invention Example is demonstrated with reference to FIG. 1, FIG.
A cyclone type oil separator (hereinafter also simply referred to as an oil separator) 10 according to an embodiment of the present invention includes, for example, an oil (oil mist mixed gas, blowby gas) generated from an oil mixed gas (oil mist mixed gas, blow-by gas) generated in a crankcase of an automobile engine (not shown). This is an oil separator that separates oil mist) and returns the separated oil to the crankcase. However, the oil separator 10 may be an oil separator that separates oil in an oil mixed gas generated inside an internal combustion engine other than an automobile engine.

  As shown in FIG. 1, the oil separator 10 includes a main body portion 20, a gas introduction portion 30, a gas discharge portion 40, an oil discharge portion 50, and a groove 60.

  The main body 20 is a container including an upper wall 21 and a side wall 22 and includes a space (a cyclone chamber, a centrifuge chamber) inside. The side wall 22 includes a cylindrical cylindrical portion 22a and a conical portion 22b whose diameter is reduced as it goes down and continues to the lower end of the cylindrical portion 22a. The lower end of the conical portion 22b is not closed and is opened downward.

  The gas introduction part 30 is a part for introducing the oil mixed gas into the main body part 20. The gas introduction part 30 is tubular and is provided at the upper end part of the cylindrical part 22a of the side wall 22 or in the vicinity thereof. The gas introduction part 30 is provided on the cylindrical part 22a of the side wall 22 so as to protrude outward in the tangential direction of the inner peripheral surface of the cylindrical part 22a.

  The gas discharge part 40 is a part for discharging the gas from which the oil is separated from the oil mixed gas to the outside of the main body part 20. The gas discharge part 40 is tubular and is provided so as to pass through the central part of the upper wall 21 or the vicinity thereof. The lower end of the gas discharge unit 40 enters the main body unit 20 and is at the same height in the vertical direction as the lower end of the gas introduction unit 30 or the vicinity thereof. The upper end of the gas discharge part 40 is located outside the main body part 20.

  The oil discharge part 50 is a part for discharging the oil separated from the oil mixed gas to the outside of the main body part 20. The oil discharge part 50 is provided at the lower end part of the main body part 20. The oil discharge part 50 consists of an opening at the lower end of the conical part 22 b of the side wall 22.

  The groove 60 is provided in a concave shape on the inner surface 22 c of the side wall 22 of the main body 20. The groove 60 is provided so as to extend linearly in a front view in the up-down direction, and a direction orthogonal to or substantially orthogonal to the direction in which the oil mixed gas flows into the main body 20 from the gas introduction unit 30 (± 10 from the orthogonal direction). (Within °). The groove 60 is provided so as to extend in the vertical direction or the substantially vertical direction. The groove 60 is continuously provided from the upper end of the cylindrical portion 22a to the lower end of the conical portion 22b.

  As shown in FIG. 2, for example, four grooves 60 are provided in the circumferential direction. However, the number of grooves 60 is not limited to four, and may be one, two, or three, or may be five or more. When a plurality of grooves 60 are provided, the interval between adjacent grooves 60 may be equal or different. When a plurality of grooves 60 are provided, the grooves 60 are independent without intersecting each other.

The width of the groove 60 may be constant from the upper end to the lower end of the groove 60, or may be increased as it goes from the upper end to the lower end of the groove 60.
The cross-sectional shape (transverse cross-sectional shape) in the direction orthogonal to the longitudinal direction of the groove 60 may be a triangle, a rectangle, a pentagon or more polygon, or a circle. It may be oval.

Here, the operation of the embodiment of the present invention will be described.
An oil mixed gas generated in a crankcase (not shown) flows into the main body 20 from the gas introduction part 30 and makes a swiveling motion in the main body 20. Since the oil mixed gas makes a swirling motion, the oil (mist) in the oil mixed gas hits the side wall inner surface 22c of the main body portion 20 due to the centrifugal force caused by the swirling motion to be aggregated into droplets, and the oil is separated from the oil mixed gas. .
The gas from which the oil is separated from the oil mixed gas is discharged from the gas discharge unit 40 and sucked into an intake system of an internal combustion engine (not shown).
The oil separated from the oil mixed gas flows into the groove 60 and flows down through the groove 60 to the oil discharge part 50. The oil that has flowed down to the oil discharge part 50 is discharged from the oil discharge part 50 to the outside of the main body part 20 and returns to the crankcase (not shown).

  In the embodiment of the present invention, the inner surface 22c of the side wall 22 of the main body portion 20 is provided with a concave groove 60 extending in a direction orthogonal or substantially orthogonal to the inflow direction of the oil mixed gas into the main body portion 20. The oil that has entered the groove 60 can immediately flow to the oil discharge portion 50 at the shortest distance or the shortest distance. Therefore, compared with the case where the centrifugally separated oil flows down in the spiral groove (conventional), the path through which the oil passes to the oil discharge portion 50 can be shortened, and re-scattering of the oil in the main body portion 20 can be suppressed. .

It is a side view of the cyclone type oil separator of the example of the present invention. It is the sectional view on the AA line of FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Cyclone-type oil separator 20 Main-body part 21 Upper wall 22 Side wall 22a Side wall cylindrical part 22b Side wall conical part 22c Side wall inner surface 30 Gas introduction part 40 Gas discharge part 50 Oil discharge part 60 Groove

Claims (1)

The main body,
A gas introduction part that is provided on a side wall of the main body part and introduces an oil mixed gas into the main body part;
A gas discharge part that is provided on the upper wall of the main body part and discharges the gas separated from the oil mixed gas to the outside of the main body part;
An oil discharge portion that is provided at a lower end portion of the main body portion and discharges oil separated from the oil mixed gas to the outside of the main body portion;
A cyclonic oil separator that causes the oil mixed gas introduced into the main body to swirl within the main body and separates the oil from the oil mixed gas by centrifugal force due to the swirling movement,
A cyclonic oil separator, wherein a concave groove extending in a direction orthogonal or substantially orthogonal to the inflow direction of the oil mixed gas into the main body is provided on the inner surface of the side wall of the main body.

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