JP4176330B2 - Oil mist separator - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an oil mist separator that recovers oil contained in blow-by gas.
[0002]
[Prior art]
The conventional oil mist separator is provided with a blow-by gas passage through which blow-by gas can be passed and oil contained in the gas can be recovered. The recovered oil is received at the bottom of the blow-by gas passage and discharged out of the passage. There is one in which an oil discharge groove is formed (for example, see JP-A-9-88544).
[0003]
[Problems to be solved by the invention]
In the above-described conventional oil mist separator, when the blow-by gas passes through the blow-by gas passage, the oil contained in the gas is recovered. The recovered oil is received by the oil discharge groove at the bottom of the blow-by gas passage and discharged out of the passage.
However, when the blow-by gas flows in the oil discharge groove, the oil collected at the corner is easily scattered in the oil discharge groove. For this reason, there has been a problem that oil recovery efficiency, so-called oil cut efficiency, is low.
[0004]
The problem to be solved by the present invention is to provide an oil mist separator capable of improving the oil cut efficiency by preventing the oil in the oil discharge groove from being scattered by the flow of blow-by gas.
[0005]
[Means for Solving the Problems]
The invention described in claim 1 that solves the above problem is provided with a blow-by gas passage through which blow-by gas can be passed and oil contained in the gas can be recovered,
A partition plate for capturing mist in the blow-by gas passage;
In the oil mist separator, the bottom of the blow-by gas passage is formed with an oil discharge groove for receiving the recovered oil and discharging it out of the passage.
The oil discharge groove is provided with gas flow changing means for changing the flow of the blow-by gas flowing in the groove ,
The gas flow changing means comprises a rib provided in a substantially weir shape in the oil discharge groove and having an opening through which the oil flows.
An oil mist separator characterized by the above.
If comprised in this way, when blow-by gas passes through a blow-by gas channel, mist is captured by a partition plate, and oil contained in the gas is collected. The recovered oil is received by the oil discharge groove at the bottom of the blow-by gas passage and discharged out of the passage.
The flow of blow-by gas flowing in the oil discharge groove is changed by the gas flow changing means. Thereby, the flow of the blow-by gas in the oil discharge groove is suppressed, and the oil cut efficiency is improved by preventing the oil in the oil discharge groove from being scattered by the blow-by gas.
[0006]
The gas flow changing means includes a rib provided in a substantially weir shape in the oil discharge groove and having an opening through which the oil flows . Therefore, by the simple structure that the rib having an opening to flow provided and oil substantially dam-shaped oil discharge groove, it is possible to configure the gas flow changing means.
[0007]
The invention described in claim 2 is the oil mist separator according to claim 1 ,
The partition plate has Tsu partition the blow-by gas passage substantially serpentine shape,
The partition plate is an oil mist separator having an inclined blade portion inclined in a downstream direction at a tip portion thereof.
If comprised in this way, the inclination blade | wing part which the partition plate which partitions off a blow-by-gas channel | path in the shape of a meander will change the flow of blow-by gas .
[0008]
The invention described in claim 3 is the oil mist separator according to claim 1 ,
The partition plate has Tsu partition the blow-by gas passage substantially serpentine shape,
The partition plate is an oil mist separator having a tip blade portion protruding toward the tip of the partition plate and an inclined blade portion inclined toward the downstream direction at the tip of the partition plate.
If comprised in this way, the flow of blow-by gas will be changed by cooperation with the front-end | tip blade | wing part and inclination blade | wing part which the partition plate which partitions off a blow-by gas passage in a meandering form has .
In addition, when a gap through which blow-by gas flows is formed between the side edge of the partition plate and the side wall surface of the blow-by gas passage, the flow of blow-by gas that has passed around the side edge of the partition plate is inclined. It can be changed by the blade part.
[0009]
The invention described in claim 4 is the oil mist separator according to claim 3 ,
The oil mist separator is characterized in that a ventilation portion located on the upstream side of the inclined blade portion is opened at a tip blade portion of the partition plate.
If comprised in this way, the flow of the blow-by gas which passed the ventilation part of the partition plate can be changed with an inclination blade | wing part.
[0010]
The invention described in claim 5 is the oil mist separator according to any one of claims 1 to 4 ,
The blow-by gas passage is formed by a combination of an engine head cover and a baffle plate,
The baffle plate is an oil mist separator having an oil discharge groove provided with the gas flow changing means and formed of a synthetic resin integrally molded product.
If comprised in this way, compared with the case where a baffle plate is formed by the coupling | bonding by welding etc. of several metal parts, the component cost of a baffle plate can be reduced and weight can be reduced.
[0011]
DETAILED DESCRIPTION OF THE INVENTION
[Embodiment 1]
Embodiment 1 of the present invention will be described. In FIG. 1 showing a front sectional view of an oil mist separator, the oil mist separator 1 is provided with a blow-by gas passage 2 through which blow-by gas can pass and oil contained in the gas can be recovered.
The blow-by gas passage 2 is formed by a combination of an engine head cover 4 and a baffle plate 10 mounted in the head cover 4.
[0012]
On the lower surface of the head cover 4, that is, the ceiling surface 2 a of the blow-by gas passage 2, an appropriate number (four in FIG. 1) of substantially quadrangular plate-like partition plates 5 are formed in a hanging shape. The ceiling surface 2a is formed in a corrugated uneven surface.
On the baffle plate 10, an appropriate number (five in FIG. 1) of substantially square plate-like partition plates 15 are formed vertically. Both the partition plates 5 and 15 partition the blow-by gas passage 2 in a meandering manner. Further, the protruding heights of the partition plates 5 and 15 are increased or decreased corresponding to the shape of the ceiling surface 2 a of the blow-by gas passage 2. The partition plate 15 of the baffle plate 10 will be described in detail later.
[0013]
A gas outlet 6 is formed substantially at the upper center of the rear side wall of the head cover 4 (the side wall located on the back side of the paper in FIG. 1). The blow-by gas that has passed through the blow-by gas passage 2 is discharged to the intake passage (not shown) of the engine through the gas outlet 6.
[0014]
Next, the baffle plate 10 will be described in detail. 2 is a plan view of the baffle plate 10, FIG. 3 is a sectional view taken along the line III-III of FIG. 2, FIG. 4 is a partial plan view of the baffle plate 10, FIG. 5 is a sectional view taken along the line V-V of FIG. 4 is a sectional view taken along line VI-VI in FIG. 4, and FIG. 7 is a sectional view taken along line VII-VII in FIG.
The baffle plate 10 shown in FIGS. 2 and 3 is formed of a synthetic resin integral molded product.
As shown in FIG. 7, the baffle plate 10 roughly includes a main plate portion 11, a partition plate 15, a bowl-shaped portion 17, and a shielding plate portion 23. Hereinafter, it demonstrates in order.
[0015]
The main plate part 11 will be described. As shown in FIGS. 3 and 7, the main plate portion 11 is formed in a substantially tray shape having a horizontally long rectangle and side plate portions 12. A mounting flange 13 is formed on the upper edge portion of the side plate portion 12 so as to project outward in a flange shape. As shown in FIG. 4, a large number of mounting holes 13a are formed on the outer peripheral portion of the mounting flange 13 at predetermined intervals in the circumferential direction (see FIG. 2). Moreover, the fitting piece 13b protrudes on the inner peripheral part of the mounting flange 13 (refer FIG.4 and FIG.7). The fitting piece 13b is formed in the baffle plate mounting portion 4a of the head cover 4 so as to be fitted (see FIGS. 6 and 6). The main plate portion 11 corresponds to the “bottom portion of the blow-by gas passage” in this specification.
[0016]
As shown in FIGS. 6 and 7, the baffle plate 10 is configured such that the mounting flange 13 is baffled in a state where the fitting piece 13 b of the mounting flange 13 of the main plate portion 11 is fitted into the baffle plate mounting portion 4 a of the head cover 4. The plate is attached to the head cover 4 (see FIG. 1) by being screwed to the plate attachment portion 4a using the attachment holes 13a (see FIG. 4).
[0017]
As shown in FIG. 3, gas inlets 14 are formed at the left and right ends of the rear plate portion (the plate portion located on the back side in FIG. 3) of the side plate portion 12 of the main plate portion 11. The blow-by gas in the external space of the oil mist separator 1 in the head cover 4 is introduced into the internal space of the oil mist separator 1, that is, the blow-by gas passage 2 through the gas inlet 14.
[0018]
Next, the partition plate 15 will be described. As shown in FIGS. 4 and 5, the partition plate 15 has a substantially square plate shape and is formed vertically on the main plate portion 11. A support piece 15b that protrudes in the thickness direction and continues to the main plate portion 11 protrudes from the lower end portion of the partition plate 15 (see FIG. 3). In FIG. 3, the support pieces 15b of the partition plate 15 located at the left and right ends respectively protrude outward in the thickness direction, and the support pieces 15b of the other partition plates 15 protrude in both the thickness directions. ing. As shown in FIG. 7, a gap S through which blow-by gas flows is formed between both side edges 15 c of the partition plate 15 and the side wall surface 2 c of the blow-by gas passage 2.
[0019]
As shown in FIG. 1, the partition plate 15 has an inclined blade portion 15 a that is inclined in the downstream direction at the tip end portion (upper end portion in FIG. 3). That is, in FIG. 1, in the partition plate 15 located on the left side of the gas outlet 6, the blow-by gas flows from the left gas inlet 14 to the gas outlet 6, so that the inclined blade portion 15 a is inclined rightward in FIG. 1. (See FIGS. 2 and 3). Further, in the partition plate 15 located on the right side of the gas outlet 6, blow-by gas flows from the right gas inlet 14 to the gas outlet 6, so that the inclined blade portion 15a is inclined leftward in FIG. (See FIG. 5).
Further, as shown in FIG. 8, the inclined blade portion 15 a protrudes in a substantially quadrangular protruding piece shape that protrudes from the central portion of the tip end portion of the partition plate 15.
[0020]
Next, the bowl-shaped part 17 will be described. As shown in FIGS. 3 to 5, the hook-shaped portion 17 is formed to extend in the longitudinal direction of the main plate portion 11 at the central portion in the short direction of the main plate portion 11 (see FIGS. 1 and 2). ).
As shown in FIG. 6, the bowl-shaped portion 17 is formed in a substantially U-shaped cross section. The bowl-shaped portion 17 forms an oil discharge groove 18 that opens on the upper surface of the main plate portion 11. The oil discharge groove 18 penetrates under the partition plate 15 (specifically, the support piece 15b) (see FIG. 7).
[0021]
As shown in FIG. 3, the bottom plate portions 17a at the left and right end portions of the bowl-shaped portion 17 are inclined downward, and the oil discharge ports 19 that open to the left and right end surfaces of the oil discharge groove 18 are formed by bending thereof. Yes. The upper half of the oil discharge port 19 is closed by the side plate portion 12 of the main plate portion 11. Further, the oil collected in the oil discharge groove 18 is discharged to the external space of the oil mist separator 1 through the oil discharge port 19.
[0022]
As shown in FIGS. 2 and 3, for example, two right and left ribs 20 are formed in a substantially dam shape in the oil discharge groove 18. As shown in FIG. 6, the rib 20 consists of a rib with a V-shaped groove. An opening 20 b formed by the V-shaped groove 20 a of the rib 20 is formed on the bottom surface of the oil discharge groove 18, and enables the oil flowing through the oil discharge groove 18 to flow. The rib 20 changes the flow of blow-by gas flowing in the oil discharge groove 18 and corresponds to “gas flow changing means” in this specification.
[0023]
Next, the shielding plate part 23 will be described. As shown in FIGS. 5 and 7, the shielding plate part 23 protrudes in an inclined manner from the lower surface of the bowl-like part 17. In FIG. 7, the shielding plate 23 has a side where oil scooped up by rotation of a cam of an engine valve mechanism arranged on the right side has the gas inlet 14 and the oil outlet 19 (see FIG. 3). Scattering to the left side in FIG. 7 is prevented. This prevents oil from entering the blow-by gas passage 2 inadvertently.
[0024]
In the oil mist separator 1 configured as described above, blow-by gas introduced into the blow-by gas passage 2 from the left and right gas inlets 14 is connected to the partition plates 5 and 5 as shown by arrows in FIG. 15 flows in a meandering manner. At this time, blow-by gas collides with the respective partition plates 5 and 15, whereby oil mist adheres to the partition plates 5 and 15, and the oil is separated and collected.
The oil collected by the partition plates 5 and 15 descends by its own weight, is received by the oil discharge groove 18, and then flows through the discharge groove 18 toward the left or right end. Then, the oil is discharged to the external space of the oil mist separator 1 through either the left or right oil discharge port 19.
The blow-by gas from which the oil has been separated through the blow-by gas passage 2 is discharged to the intake passage (not shown) of the engine through the gas outlet 6.
[0025]
According to the oil mist separator 1 described above, the flow of blow-by gas flowing in the oil discharge groove 18 is changed by the rib 20 (see FIG. 6) having the opening 20b as gas flow changing means. That is, in FIG. 1, the flow of blow-by gas flowing in the oil discharge groove 18 from the left gas inlet 14 to the right is blocked by the left rib 20 and directed upward. The flow of blow-by gas flowing in the oil discharge groove 18 from the right gas inlet 14 toward the left is blocked by the right rib 20 and directed upward.
Thereby, the flow of blow-by gas in the oil discharge groove 18 is suppressed, and the oil cut efficiency is improved by preventing the oil in the oil discharge groove 18 from being scattered by the blow-by gas.
[0026]
Further, the gas flow changing means can be configured by a simple structure of the rib 20 (see FIG. 6) provided in the oil discharge groove 18 in a substantially weir shape and having an opening 20b through which oil flows.
[0027]
Moreover, the inclined blade | wing part 15a (refer FIG. 5) which the partition plate 15 of the baffle plate 10 has changes the flow of blow-by gas. For example a blow-by gas collides with the inclined shape wall i.e. roof surface 2a of the blow-by gas passage 2 by (in FIG. 5, see arrows) that, since the oil mist in the blow-by gas is easily liquefied, is enhanced oil cut efficiency The
[0028]
Further, the baffle plate 10 (see FIGS. 2 and 3) having the oil discharge groove 18 provided with the ribs 20 is formed of an integrally molded product of synthetic resin. Thereby, compared with the case where a baffle plate is formed by the coupling | bonding by welding etc. of several metal parts, the parts cost of the baffle plate 10 can be reduced and weight can be reduced.
In addition, the baffle plate formed by welding of metal parts requires painting, plating, etc. to prevent rust, but according to the baffle plate 10 which is an integrally molded product of synthetic resin, It can be used without the need for special coating or plating.
[0029]
[Embodiment 2]
A second embodiment of the present invention will be described with reference to FIG. FIG. 9 is a cross-sectional view showing the main part according to FIG.
Since the second embodiment is obtained by changing a part of the first embodiment described above, the changed portion will be described in detail, and redundant description will be omitted. In the following embodiments, the same description will not be repeated.
[0030]
The second embodiment shows a modified example of the rib 20 (see FIG. 6) formed of a V-shaped grooved rib in the oil discharge groove 18 of the baffle plate 10 in the first embodiment.
That is, as shown in FIG. 9, the rib of the second embodiment (reference numeral 220) is a U-shaped grooved rib. An opening 220b formed by the U-shaped groove 220a of the rib 220 is formed on the bottom surface of the oil discharge groove 18 and allows the oil flowing through the oil discharge groove 18 to flow.
The rib 220 changes the flow of blow-by gas flowing in the oil discharge groove 18 in the same manner as the rib 20 (see FIG. 6) in the first embodiment, and corresponds to “gas flow changing means” in this specification. To do.
[0031]
[Embodiment 3]
A third embodiment of the present invention will be described with reference to FIG. FIG. 10 is a perspective view showing a partition plate of the oil mist separator.
The third embodiment shows a modification of the inclined blade portion 15a (see FIG. 8) of the partition plate 15 in the first embodiment.
That is, as shown in FIG. 10, the inclined blade portion (indicated by reference numeral 315 a) of the third embodiment is formed over the entire width of the partition plate 15.
[0032]
[Embodiment 4]
A fourth embodiment of the present invention will be described with reference to FIG. FIG. 11 is a perspective view showing a partition plate of the oil mist separator.
The fourth embodiment shows a modification of the partition plate 15 (see FIG. 8) in the first embodiment.
That is, as shown in FIG. 11, the partition plate 15 according to the fourth embodiment has a tip blade portion 415 </ b> A that protrudes toward the end of the partition plate 15 (upward in FIG. 11 ), and a downstream direction at the end of the partition plate 15. It has the inclined blade | wing part 415B which inclines. The inclined blade portion 415 </ b> B protrudes in the shape of a substantially quadrangular protruding piece that protrudes from the central portion of the tip portion of the partition plate 15.
[0033]
According to the fourth embodiment, the flow of blow-by gas is changed by the cooperation of the tip blade portion 415A and the inclined blade portion 415B of the partition plate 15 that partitions the blow-by gas passage 2 in a meandering manner .
When a gap S (see FIG. 7) through which blow-by gas flows is formed between the side edge 415c of the partition plate 15 and the side wall surface 2c of the blow-by gas passage 2, the side edge 415c of the partition plate 15 is The flow of blow-by gas that has passed around can be changed .
[0034]
[Embodiment 5]
A fifth embodiment of the present invention will be described with reference to FIG. FIG. 12 is a perspective view showing a partition plate of the oil mist separator.
The fifth embodiment shows a modified example of the inclined blade portion 415B (see FIG. 11) of the partition plate 15 in the fourth embodiment.
That is, as shown in FIG. 12, the inclined blade portion (indicated by reference numeral 515 </ b> B) of the fifth embodiment is formed over the entire width of the partition plate 15.
[0035]
[Embodiment 6]
A sixth embodiment of the present invention will be described with reference to FIG. FIG. 13 is a perspective view showing a partition plate of the oil mist separator.
The sixth embodiment shows a modification of the tip blade portion 415A (see FIG. 11) of the partition plate 15 in the fourth embodiment.
That is, as shown in FIG. 13, a U-shaped groove-shaped ventilation portion 615C located upstream of the inclined blade portion 415B is opened at the tip blade portion (indicated by reference numeral 615A) of the sixth embodiment. .
[0036]
According to the sixth embodiment, the flow of blow-by gas that has passed through the ventilation portion 615C of the partition plate 15 can be changed by the inclined blade portion 415B.
[0037]
[Embodiment 7]
Embodiment 7 of the present invention will be described with reference to FIG. FIG. 14 is a perspective view showing a partition plate of the oil mist separator.
The seventh embodiment shows a modification of the tip blade portion 415A (see FIG. 12) of the partition plate 15 in the fifth embodiment.
That is, as shown in FIG. 14, the tip blade portion (symbol, 715A) of the seventh embodiment has an upstream portion of the inclined blade portion 415B, as in the sixth embodiment (see FIG. 13). A U-shaped groove-shaped ventilation portion 715C located on the side is opened.
[0038]
The present invention is not limited to the above-described embodiments, and modifications can be made without departing from the gist of the present invention. For example, the gas flow changing means does not hinder the flow of oil collected in the oil discharge groove 18 to the oil discharge port 19 and can change any flow of blow-by gas flowing in the oil discharge groove 18. Such a shape may be used. For example, in addition to the ribs 20 and 220, a rib having a hole, a rib formed in a net shape, or the like, a protruding piece, a comb-like protrusion, or the like may be used.
Further, the baffle plate 10 is not limited to an integrally molded product of synthetic resin, and can be formed by, for example, joining by metal or resin parts such as welding or adhesion. Further, the inclined blade portions 15a and 315a, the tip blade portions 415A, 615A and 715A, and the inclined blade portions 415B and 515B of the baffle plate 10 can be formed on the partition plate 5 on the head cover 4 side. It is. Further, the baffle plate 10 formed of an integrally molded product of synthetic resin may have an oil discharge groove provided with at least a gas flow changing means.
[0039]
【The invention's effect】
As described above in detail, according to the oil mist separator of the present invention, the flow of blow-by gas flowing in the oil discharge groove is changed by the gas flow changing means, so that the oil in the oil discharge groove by the flow of blow-by gas is changed. Spattering is prevented. Therefore, oil cut efficiency can be improved.
[Brief description of the drawings]
FIG. 1 is a front sectional view showing an oil mist separator according to a first embodiment of the present invention.
FIG. 2 is a plan view showing a baffle plate.
3 is a cross-sectional view taken along line III-III in FIG.
FIG. 4 is a partial plan view of a baffle plate.
5 is a cross-sectional view taken along line VV in FIG.
6 is a cross-sectional view taken along line VI-VI in FIG.
7 is a cross-sectional view taken along line VII-VII in FIG.
FIG. 8 is a perspective view showing a partition plate.
FIG. 9 is a cross-sectional view showing the main parts according to the second embodiment of the present invention in accordance with FIG.
FIG. 10 is a perspective view showing a partition plate according to a third embodiment of the present invention.
FIG. 11 is a perspective view showing a partition plate according to a fourth embodiment of the present invention.
FIG. 12 is a perspective view showing a partition plate according to a fifth embodiment of the present invention.
FIG. 13 is a perspective view showing a partition plate according to a sixth embodiment of the present invention.
FIG. 14 is a perspective view showing a partition plate according to a seventh embodiment of the present invention.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Oil mist separator 2 Blow-by gas passage 5 Partition plate 10 Baffle plate 15 Partition plate 15a Inclined blade part 18 Oil discharge groove 20 Rib (gas flow change means)
20b opening 220 rib (gas flow changing means)
220b Opening 315a Inclined blade portion 415 Partition plate 415A Tip blade portion 415B Inclined blade portion 515B Inclined blade portion 615C Ventilation portion 715A Tip blade portion 715C Ventilation portion

Claims (5)

A blow-by gas passage that allows the blow-by gas to pass through and recovers oil contained in the gas is provided,
A partition plate for capturing mist in the blow-by gas passage;
In the oil mist separator, the bottom of the blow-by gas passage is formed with an oil discharge groove for receiving the recovered oil and discharging it out of the passage.
The oil discharge groove is provided with gas flow changing means for changing the flow of the blow-by gas flowing in the groove ,
The gas flow changing means comprises a rib provided in a substantially weir shape in the oil discharge groove and having an opening through which the oil flows.
An oil mist separator characterized by that. The oil mist separator according to claim 1 ,
The partition plate has Tsu partition the blow-by gas passage substantially serpentine shape,
The said partition plate has the inclined blade | wing part which inclines in the downstream direction at the front-end | tip part, The oil mist separator characterized by the above-mentioned. The oil mist separator according to claim 1 ,
The partition plate has Tsu partition the blow-by gas passage substantially serpentine shape,
The said partition plate has the front-end | tip blade | wing part which protrudes ahead of the partition plate, and the inclined blade | wing part which inclines in the downstream direction ahead of the partition plate, The oil mist separator characterized by the above-mentioned. The oil mist separator according to claim 3 ,
An oil mist separator, wherein a ventilation portion located upstream of the inclined blade portion is opened at a tip blade portion of the partition plate. The oil mist separator according to any one of claims 1 to 4 ,
The blow-by gas passage is formed by a combination of an engine head cover and a baffle plate,
The oil mist separator is characterized in that the baffle plate has an oil discharge groove provided with the gas flow changing means and is formed of a synthetic resin integrally molded product.

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