JP2019105178A - Oil separator - Google Patents

Abstract

To provide an oil separator free from a risk of failure of downstream-side equipment even when much liquid oil with large particle size is included in blowby gas.SOLUTION: In an oil separator 1 capable of capturing oil mist included in a blowby gas, an oil mist upstream-side collection chamber 51 communicated with blowby gas inflow ports 11, 12 and an oil mist downstream-side collection chamber 52 communicated with the oil mist upstream-side collection chamber 51 and further communicated with a blowby gas outflow port 13, are provided in adjacent to each other through a partitioning plate 31. The partitioning plate 31 has a return hole 34 for returning the oil mist collected in the oil mist downstream-side collection chamber 52 to the oil mist upstream-side collection chamber 51. A height position of the return hole 34 is set to be a position higher than a height position of a lower surface 51a in the oil mist upstream-side collection chamber 51, and set to be a position same as a height position of a lowermost portion 52b of the lower face 52a in the oil mist downstream-side collection chamber 52.SELECTED DRAWING: Figure 5

Description

  The present invention relates to an oil separator, and more particularly to an oil separator capable of collecting an oil mist contained in blowby gas.

  Conventionally, in an internal combustion engine such as an automobile engine, so-called PCV causes discharge of blowby gas (unburned gas) leaking from the gap between the piston ring and the cylinder wall during operation to the atmosphere. The blow-by gas is returned to the intake system and reburned by a (positive crankcase ventilation) system. Here, since the blowby gas contains oil mist in which lubricating oil such as engine oil is atomized, it is necessary to prevent the oil mist in the blowby gas from flowing out to the intake system. Therefore, as a means for collecting the oil mist in the blowby gas, an oil separator is attached in the middle of the connecting flow path connecting the crankcase and the intake pipe.

  As such an oil separator 101, for example, a labyrinth type is already known (see FIG. 6). The oil separator 101 includes a lower base 110, a middle base 130, and an upper base 140. When the bases 110, 130, 140 are assembled by vibration welding or the like, the liquid oil collecting chamber 150 and the oil mist 1 It is comprised so that the next collection chamber 151 and the oil mist secondary collection chamber 152 may be provided (refer FIG. 7). The liquid oil collecting chamber 150 is formed of a space partitioned so as to be able to collect a large diameter liquid oil (not shown) contained in the blowby gas. In addition, the oil mist primary collection chamber 151 is provided on the downstream side of the liquid oil collection chamber 150 and is a space partitioned so as to be capable of collecting an oil mist (not shown) having a small particle diameter contained in the blowby gas. It consists of Further, the oil mist secondary collection chamber 152 is provided downstream of the oil mist primary collection chamber 151 via the partition plate 131 of the middle base 130 and has a small particle diameter contained in the blowby gas. It is composed of a space partitioned so as to be able to collect oil mist. The partition plate 131 has a first communication port 132 for communicating the oil mist primary collection chamber 151 to the downstream side of the liquid oil collection chamber 150, and the oil mist 2 downstream of the oil mist primary collection chamber 151. A second communication port 133 communicating the next collection chamber 152 and a return hole 134 for returning the oil mist collected in the oil mist secondary collection chamber 152 back to the oil mist primary collection chamber 151 are formed.

  As described above, since a plurality of oil mist collection chambers (in this example, two oil mist primary collection chambers 151 and oil mist secondary collection chambers 152) are provided, blow-by gas flowing into the oil separator 101 The route length of can be secured long. Therefore, the collection efficiency of the small particle diameter oil mist contained in the blowby gas can be enhanced. In addition, the oil mist collected in the oil mist secondary collection chamber 152 can be collected together with the oil mist collected in the oil mist primary collection chamber 151 by the return hole 134, and the collected oil mist is liquefied It can be recovered together with the liquid oil collected by the oil collection chamber 150. If it can collect | recover in this way, the oil mist collected by the oil mist secondary collection chamber 152 can be collect | recovered, without providing a collection path for exclusive use separately. Therefore, as described above, the oil separator 101 can be made compact while the collection efficiency of the oil mist of small particle size contained in the blowby gas can be enhanced.

As prior art document information related to the invention of this application, for example, Patent Document 1 is known.
JP, 2009-68471, A

  However, in the above-described conventional oil separator 101, the height position of the return hole 134 from the viewpoint of increasing the efficiency of returning the oil mist collected in the oil mist secondary collection chamber 152 back to the oil mist primary collection chamber 151 Is set at the same height position as the height position of the lower surface 151a in the oil mist primary collection chamber 151 (see FIG. 8). Further, the height position of the return hole 134 is set at the same height position as the height position of the lowermost portion 152 b of the lower surface 152 a in the oil mist secondary collection chamber 152. That is, the return hole 134 is formed along the lower surface 151 a of the oil mist primary collection chamber 151 and the lower surface 152 a of the oil mist secondary collection chamber 152.

  When the blow-by gas contains a large amount of liquid oil having a large particle size, the blow-by gas flows from the liquid oil collection chamber 150 into the oil mist primary collection chamber 151 via the first communication port 132. A blowby gas containing liquid oil with a large particle diameter may pass through the return hole 134 (shortcut) without flowing through the second communication port 133 and may flow into the oil mist secondary collection chamber 152. Therefore, the large-diameter liquid oil having passed through the return hole 134 may flow out from the outlet 113 of the lower base 110. Therefore, the large-diameter liquid oil may be reburned by the internal combustion engine that is the downstream device of the oil separator 101. As a result, this internal combustion engine would be damaged.

  The present invention is intended to solve such problems, and an object thereof is to provide an oil separator which does not cause a failure of downstream equipment even if a large particle size liquid oil is contained in a blowby gas. It is to be.

  The present invention is for achieving the above-mentioned object, and is configured as follows. The invention according to claim 1 is an oil separator capable of collecting oil mist contained in blowby gas. In the oil separator, an oil mist upstream side collection chamber communicating with the blow-by gas inlet and an oil mist upstream side collection chamber communicating with the oil mist upstream side collection chamber, and an oil mist downstream side collection communicating with the blow-by gas outlet It is provided so that a room may adjoin via a partition plate. The partition plate is formed with a return hole for returning the oil mist collected in the oil mist downstream side collection chamber to the oil mist upstream side collection chamber. The height position of the return hole is set to a position higher than the height position of the lower surface in the oil mist upstream side collection chamber, and the same as the height position of the lowest portion of the lower surface in the oil mist downstream side collection chamber It is set to the height position.

  According to the invention of claim 1, when the blowby gas contains a large particle diameter liquid oil, the blowby gas containing the large particle diameter liquid oil that has flowed into the oil mist upstream side collecting chamber is the oil mist upstream. It does not flow into the return hole along the lower surface of the side collection chamber. Therefore, unlike the prior art, a large particle size liquid oil does not flow out from the outlet. Therefore, the large-diameter liquid oil is not reburned by the downstream device (for example, the internal combustion engine) of the oil separator. As a result, failure of the internal combustion engine does not occur.

  The invention according to claim 2 is the oil separator according to claim 1, wherein the blow-by gas is supplied to the return hole in the vicinity of the return hole in the wall surface on the oil mist upstream side collecting chamber side of the partition plate. Ribs are formed to prevent inflow.

  According to the second aspect of the present invention, the inflow of blow-by gas to the return hole can be further prevented.

  The invention according to a third aspect is the oil separator according to the second aspect, wherein the rib is formed in a substantially U shape.

  According to the invention of claim 3, it is possible to more reliably prevent the inflow of the blowby gas into the return hole.

It is a whole perspective view of an oil separator concerning an embodiment. It is an exploded view of FIG. It is a front view of the middle base of FIG. It is the IV-IV sectional view taken on the line of FIG. It is a schematic diagram of the inside of FIG. It is a whole perspective view of the oil separator concerning a prior art. It is an exploded view of FIG. It is a schematic diagram of the inside of FIG.

  Hereinafter, an embodiment for carrying out the present invention will be described with reference to FIGS. First, an oil separator 1 according to an embodiment of the present invention will be described. The oil separator 1 is a labyrinth type, and is configured of a lower base 10, a middle base 30, and an upper base 40 (see FIGS. 1 and 2), as with the oil separator 101 of the prior art.

  The lower base 10 is composed of a casing member having a recess 10a and an opening 10b formed on the opposite side of the recess 10a. Below the recess 10a, there are formed a first inlet 11 and a second inlet 12 through which blow-by gas (not shown) can flow. Further, an outlet 13 through which the blowby gas can flow is formed on the upper side of the recess 10a. Further, the first collision wall 14 to the sixth collision wall 19 are formed in the recess 10 a.

  Moreover, the middle base 30 is comprised from the panel member which can block the opening 10b of the lower base 10 (refer FIGS. 3-4). A partition plate 31 is formed on the middle base 30 for separating an oil mist primary collection chamber 51 and an oil mist secondary collection chamber 52 to be adjacent to each other. On the right side of the partition plate 31, a first communication port 32 is formed to communicate the liquid oil collection chamber 50 described later and the oil mist primary collection chamber 51. Further, on the upper side of the partition plate 31, a second communication port 33 for communicating the oil mist primary collection chamber 51 and the oil mist secondary collection chamber 52 is formed. Further, the partition plate 31 is formed with a return hole 34 for returning the oil mist (not shown) having a small particle diameter collected in the oil mist secondary collection chamber 52 to the oil mist primary collection chamber 51. There is.

  The height position of the return hole 34 is set to a position higher than the height position of the lower surface 51 a in the oil mist primary collection chamber 51 (see FIGS. 2 and 5). That is, a sufficient gap is formed between the return hole 34 and the lower surface 51 a of the oil mist primary collection chamber 51. The height position of the return hole 34 is set at the same height position as the height position of the lowermost portion 52 b of the lower surface 52 a of the oil mist secondary collection chamber 52. That is, unlike the prior art, the return hole 34 is formed along only the lower surface 52 a of the oil mist secondary collection chamber 52 without being along the lower surface 51 a of the oil mist primary collection chamber 51. Further, in the vicinity of the return hole 34 in the wall surface 31a of the partition plate 31 on the oil mist primary collection chamber 51 side, a substantially U-shaped rib 35 for preventing the blowby gas from flowing into the return hole 34 is It is formed.

  Further, the upper base 40 is formed of a cover member capable of covering the partition plate 31 of the middle base 30.

  The oil separator 1 includes the liquid oil collecting chamber 50, the oil mist primary collecting chamber 51, and the oil mist secondary collecting chamber 52 when the respective bases 10, 30, 40 are assembled by vibration welding or the like. Configured (see FIG. 2). The liquid oil collecting chamber 50 is configured of a space partitioned so as to be able to collect a large particle size liquid oil (not shown) contained in the blowby gas.

  Further, the oil mist primary collection chamber 51 is provided on the downstream side of the liquid oil collection chamber 50 and is configured from a space partitioned so as to be capable of collecting an oil mist of a small particle diameter contained in the blowby gas. There is. Further, the oil mist secondary collection chamber 52 is provided on the downstream side of the oil mist primary collection chamber 51 via the partition plate 31 of the middle base 30 so as to be adjacent to the small particle diameter contained in the blowby gas. It is composed of a space partitioned so as to be able to collect oil mist.

  The oil separator 1 is composed of the lower base 10, the middle base 30, and the upper base 40. The lower base 10, the middle base 30, and the upper base 40 are integrally formed of a rigid synthetic resin (for example, PP). The oil separator 1 configured in this manner is attached in the middle of a connecting flow path (neither is shown) connecting the crankcase and the intake pipe, as in the prior art. This attachment is performed via a metal collar (not shown) between the attachment portion 20 of the lower base 10 and the attachment portion 36 of the middle base 30.

  Next, the operation of the oil separator 1 described above will be described with reference to FIGS. The blowby gas flows into the liquid oil collection chamber 50 from the connection flow passage on the crankcase side via the respective inlets 11 and 12 of the lower base 10. Then, the inflowing blowby gas collides with the recess 10 a of the lower base 10, the inner wall 10 c, the collision walls 14 to 17, the inner surface of the middle base 30, and the like. As a result, liquid oil having a large particle diameter contained in the colliding blow-by gas adheres to the recess 10a, the inner wall 10c, the collision walls 14 to 17 of the lower base 10, the inner surface of the middle base 30, and the like. Therefore, the attached large-diameter liquid oil drops by its own weight and is returned to the respective inlets 11 and 12 via the lower surface 50a of the liquid oil collecting chamber 50 and collected. Thus, the liquid oil collecting chamber 50 collects the large particle size liquid oil contained in the blowby gas.

  Subsequently, the blowby gas flows from the liquid oil collection chamber 50 into the oil mist primary collection chamber 51 via the first communication port 32. Then, the inflowing blow-by gas collides with the wall surface 31 a of the partition plate 31, the inner surface of the upper base 40, and the like. As a result, oil mist having a small particle diameter contained in the colliding blow-by gas adheres to the wall surface 31 a of the partition plate 31, the inner surface of the upper base 40, and the like. Therefore, the attached small particle diameter oil mist drops by its own weight and is returned to the liquid oil collection chamber 50 through the lower surface 51a of the oil mist primary collection chamber 51 and the first communication port 32 to form large particles. Recovered with liquid oil of diameter. In this manner, the oil mist primary collection chamber 51 collects the oil mist of a small particle diameter contained in the blowby gas.

  Subsequently, the blowby gas flows from the oil mist primary collection chamber 51 to the oil mist secondary collection chamber 52 via the second communication port 33. Then, the inflowing blow-by gas collides with the recess 10 a of the lower base 10, the inner wall 10 c, the collision walls 17 to 19, the back surface 31 b of the partition plate 31 and the like. As a result, oil mist having a small particle diameter contained in the colliding blow-by gas adheres to the recess 10a, the inner wall 10c, the collision walls 17 to 19 of the lower base 10, the back surface 31b of the partition plate 31, and the like. Therefore, the attached small particle diameter oil mist drops by its own weight and is returned to the oil mist primary collection chamber 51 via the lower surface 52a of the oil mist secondary collection chamber 52 and the return hole 34 to form small particles It is collected with oil mist of diameter. In this manner, the oil mist secondary collection chamber 52 collects the oil mist of a small particle size contained in the blowby gas.

  Finally, the blowby gas flows out from the oil mist secondary collection chamber 52 through the outlet 13 of the lower base 10 to the connection flow passage on the intake pipe side. As a result, it is possible to prevent the large particle size liquid oil and the small particle size oil mist in the blowby gas from flowing out to the connecting flow passage on the intake pipe side, and the internal combustion engine which is the downstream device of the oil separator 1 It can be returned to and reburned.

  In the description of the operation of the oil separator 1 described above, a plurality of oil mist collection chambers (in this example, two oil mist primary collection chambers 51 and oil mist secondary collection chambers 52) are provided. Therefore, the path length of the blowby gas flowing into the oil separator 1 can be secured long. Therefore, the collection efficiency of the oil mist of the small particle size contained in blowby gas can be raised like a prior art.

  In addition, the oil mist collected in the oil mist secondary collection chamber 52 can be collected together with the oil mist collected in the oil mist primary collection chamber 51 by the return hole 34, and the collected oil mist is liquid oil The liquid oil collected in the collection chamber 50 can be recovered. If it can collect | recover like this, the oil mist collected by the oil mist secondary collection chamber 52 can be collect | recovered, without providing an exclusive collection | recovery path separately similarly to a prior art. Therefore, as described above, the oil separator 1 can be made compact while the collection efficiency of the oil mist of small particle size contained in the blowby gas can be enhanced.

  The oil separator 1 according to the embodiment of the present invention is configured as described above. According to this configuration, the height position of the return hole 34 of the partition plate 31 of the middle base 30 is set to a position higher than the height position of the lower surface 51 a in the oil mist primary collection chamber 51. The height position of the return hole 34 is set at the same height position as the height position of the lowermost portion 52 b of the lower surface 52 a of the oil mist secondary collection chamber 52. When the blow-by gas contains a large amount of liquid oil having a large particle size, the blow-by gas flows from the liquid oil collection chamber 50 into the oil mist primary collection chamber 51 via the first communication port 32. The blowby gas containing the large diameter liquid oil does not flow into the return hole 34 along the lower surface 51 a of the oil mist primary collection chamber 51. Therefore, unlike the prior art, the large particle size liquid oil does not flow out from the outlet 13 of the lower base 10. Therefore, the large-diameter liquid oil is not reburned by the internal combustion engine which is the downstream device of the oil separator 1. As a result, failure of the internal combustion engine does not occur.

  Further, according to this configuration, in the vicinity of the return hole 34 in the wall surface 31 a on the oil mist primary collection chamber 51 side of the partition plate 31, the rib 35 for preventing the blowby gas from flowing into the return hole 34 is It is formed. Therefore, the inflow of blowby gas to the return hole 34 can be further prevented.

  Further, according to this configuration, the rib 35 is formed in a substantially U shape. Therefore, the inflow of the blowby gas to the return hole 34 can be more reliably prevented.

  The above-described content relates to only one embodiment of the present invention, and does not mean that the present invention is limited to the above-described content.

  In the embodiment, the rib 35 has been described as being substantially U-shaped. However, the present invention is not limited to this, and the rib 35 may be formed in a substantially V-shape or a substantially U-shape. Even in that case, it is possible to obtain the same function and effect as the embodiment in which the rib 35 is formed in a substantially U-shape.

  In the embodiment, the lower base 10, the middle base 30, and the upper base 40 are integrally formed of a synthetic resin (for example, PP) having rigidity. However, the present invention is not limited to this, and the lower base 10, the middle base 30, and the upper base 40 may be integrally formed of metal. In that case, the strength and heat resistance of the oil separator 1 can be enhanced.

  Further, in the embodiment, the embodiment has been described in which two oil mist collecting chambers are provided in the oil separator 1. However, the present invention is not limited to this, and as long as the oil separator 1 has two or more oil mist collecting chambers, any number (three, four,...) May be provided.

1 Oil Separator 11 First Inlet (Inlet)
12 second inlet (inlet)
31 partition plate 34 return hole 35 rib 51 oil mist primary collection chamber (oil mist upstream collection chamber)
51a lower surface 52 oil mist secondary collection chamber (oil mist downstream collection chamber)
52a Bottom 52b Bottom

Claims (3)

An oil separator capable of collecting oil mist contained in blowby gas,
An oil mist upstream side collection chamber in communication with the blow-by gas inlet;
An oil mist downstream-side collection chamber in communication with the oil mist upstream-side collection chamber and in communication with the blow-by gas outlet is provided adjacent to each other via a partition plate,
The partition plate is formed with a return hole for returning the oil mist collected in the oil mist downstream side collection chamber to the oil mist upstream side collection chamber,
The height position of the return hole is set at a position higher than the height position of the lower surface in the oil mist upstream side collecting chamber, and the height of the lowest portion of the lower surface in the oil mist downstream side collecting chamber Oil separator set to the same height position as the position. An oil separator according to claim 1, wherein
An oil separator having a rib formed in the vicinity of the return hole in the wall surface on the oil mist upstream side collection chamber side of the partition plate, for preventing the blowby gas from flowing into the return hole. An oil separator according to claim 2, wherein
The rib is an oil separator formed in a substantially U-shape.

Images