JP5392117B2 - Oil separator - Google Patents

Description

  The present invention relates to an oil separator for separating oil mist from an oil mist-containing gas that is a blow-by gas in an engine.

  In general, an engine is provided with a PCV (positive crankcase ventilation) for collecting blow-by gas flowing out of the combustion chamber into the crankcase so as not to be released into the atmosphere. The blow-by gas is returned from the crankcase to the intake system by this PCV, and the blow-by gas is combusted. In this case, since the oil is present as fine particles (oil mist) in the blow-by gas, the oil mist is separated from the gas and returned to the crankcase without burning the blow-by gas as it is. A separator is used.

  As this type of conventional oil separator, for example, a configuration as disclosed in Patent Document 1 has been proposed. In this conventional configuration, a gas passage through which oil mist-containing gas flows is formed inside the housing. A partition wall is provided in the gas passage in the housing, and an orifice for accelerating the gas flow is formed in a part of the partition wall. In the housing, on the downstream side of the orifice, a collision plate with which the gas flow collides is arranged in an opposed state. And when the gas which passed the orifice collides with a collision board, the oil mist contained in gas is isolate | separated.

JP 2008-157047 A

  In the oil separator disclosed in Patent Document 1, a concave and convex surface having a rectangular wave shape is formed on the side surface of the collision plate facing the partition wall so that the contact area of the collision plate with the gas is expanded. However, in this patent document 1, the device which collect | recovers the oil mist adhering to a collision board rapidly is not given. For this reason, there is a high possibility that the oil mist adhering to the collision plate is re-scattered by the gas flow, and as a result, there is a problem that the oil mist separation performance is lowered.

  The present invention has been made paying attention to such problems existing in the prior art. An object of the present invention is to provide an oil separator that can suppress the oil mist separated at the collision portion from being re-scattered by the gas flow and improve the oil mist separation performance.

In order to achieve the above object, according to the present invention, in an oil separator having a passage through which oil mist-containing gas flows, an orifice for accelerating the gas flow is provided in a part of the passage, and the downstream side of the orifice gas stream to provided collision portion collides, to form a water-repellent oil repellent treated surface to the collision portion, it is characterized in that around the collision portion provided with a hydrophilic-lipophilic treatment surface.

  Accordingly, in the oil separator according to the present invention, the oil mist-containing gas flowing through the gas passage passes through the orifice and collides with the collision portion, and the oil mist in the gas is dropped by the collision portion. To be separated. In this case, because the collision part is treated with water and oil repellency, the separated and captured oil mist does not stay on the collision part and easily moves around the collision part by its own weight and gas flow. It is done. Therefore, it is possible to suppress the oil mist separated in the collision part from being re-scattered by the gas flow, and the oil mist separation performance can be improved. Here, the oil mist includes not only an oil component but also a water component, but even if it includes water, it is referred to as an oil mist.

  Then, by providing a hydrophilic / lipophilic treatment surface around the collision part, the oil mist moved from the collision part is moved downward in a state of adhering to the hydrophilic / lipophilic treatment surface and promptly without scattering. Collected.

The said structure WHEREIN: It is good to comprise the said collision part with the protrusion part which protruded from the said hydrophilic and lipophilic process surface.
The said structure WHEREIN: It is good to form the said protrusion in a circular shape in the cross section parallel to a gas flow.

In the above configuration, the protrusions may be formed in a trapezoidal shape in a cross section parallel to the gas flow.
Furthermore, in the above configuration, the water / oil repellent treatment may be formed on the top surface of the protrusion.

  As described above, according to the present invention, the oil mist separated at the collision portion can be prevented from being re-scattered by the gas flow, and the effect of improving the oil mist separation performance can be achieved. To do.

The principal part sectional view showing the oil separator of a 1st embodiment. Sectional drawing in the 2-2 line of FIG. FIG. 3 is a partial plan sectional view showing a part of FIG. 2 in an enlarged manner. FIG. 4 is an enlarged cross-sectional view taken along line 4-4 of FIG. The partial plane sectional view showing the oil separator of a 2nd embodiment. The partial plane sectional view showing the oil separator of a 3rd embodiment. The fragmentary sectional side view which shows the oil separator of 4th Embodiment. The fragmentary flat sectional view which shows the oil separator of 4th Embodiment.

(First embodiment)
A first embodiment of an oil separator embodying the present invention will be described below with reference to FIGS.

  As shown in FIGS. 1 and 2, the oil separator 11 of this embodiment is disposed on a cylinder head cover 12 made of a synthetic resin (for example, nylon 6-6) in an engine. The housing 13 of the oil separator 11 has a substantially square box shape and is formed integrally with the cylinder head cover 12. A gas inlet 14 communicating with the crank chamber of the engine is formed in the bottom wall 13a on one side of the housing 13. A gas outlet 15 communicating with the intake passage of the engine is formed in the upper wall 13b on the other side of the housing 13. Between the gas inlet 14 and the gas outlet 15, a gas passage 16 is formed in the housing 13 through which blow-by gas, which is an oil mist-containing gas, flows.

  A first separation plate 17 is erected on the bottom wall 13 a of the housing 13 so as to be positioned in the vicinity of the gas inlet 14, and between the upper edge of the first separation plate 17 and the upper wall 13 b of the housing 13. A gap 18 for securing the gas passage 16 is formed. A second separation plate 19 is suspended from the upper wall 13 b of the housing 13 so as to be located downstream of the first separation plate 17. Between the lower end edge of the second separation plate 19 and the bottom wall 13 a of the housing 13. A gap 20 is formed for securing the gas passage 16. A third separation plate 21 is erected on the bottom wall 13 a of the housing 13 so as to be located downstream of the second separation plate 19, and an upper end edge of the third separation plate 21 and an upper wall 13 b of the housing 13 are arranged. A gap 22 for securing the gas passage 16 is formed therebetween.

  A meandering gas passage 16 is formed in the housing 13 by the first to third separation plates 17, 19, 21 and the first to third gaps 18, 20, 22. In addition, each side surface of the first to third separation plates 17, 19, 21 on the upstream side of the gas passage 16 has separation surfaces 17 a, 19 a for attaching and separating oil mist having a large particle size contained in blow-by gas. , 21a. Further, small holes 17b and 21b are formed at the lower ends of the first and third separation plates 17 and 21 for guiding the oil captured and flowing down by the separation surfaces 17a and 21a to the downstream side of the gas passage 16. Yes.

  A partition wall 23 is integrally formed in the gas passage 16 in the housing 13 so as to be located on the downstream side of the third separation plate 21. A plurality of orifices 24 for accelerating the flow of blow-by gas are arranged in the partition wall 23 side by side. On the downstream side of the partition wall 23, a collision plate 25 is integrally provided between the bottom wall 13a and the upper wall 13b of the housing 13, and as shown in FIG. A pair of gaps 26 for securing the gas passage 16 is formed between the side wall and the side wall. On the side surface of the collision plate 25 that directly faces each orifice 24, a planar collision portion 25a where the gas flow from the orifice 24 collides is provided. Then, when the gas that has passed through each orifice 24 collides with the collision part 25a, oil mist having a small particle size contained in the gas adheres to the collision part 25a in a droplet form and is separated.

  As shown in FIGS. 3 and 4, a water / oil repellent treatment surface 27 is formed at each collision portion 25 a on the collision plate 25. In this embodiment, the water / oil repellent surface 27 is formed by applying or coating a water / oil repellent material such as a fluororesin on the collision portion 25a. A hydrophilic / lipophilic treatment surface 28 is provided on the side surface of the collision plate 25 around each collision portion 25 a in the collision plate 25. The processing surface 28 is configured by applying or coating a hydrophilic / lipophilic material (polyethylene glycol, amino group, etc.) on the side surface of the collision plate 25 around the collision portion 25a.

  As shown in FIG. 4, at the lower end of the partition wall 23, the oil that has been captured and flowed down by the separation surfaces 17 a, 19 a, 21 a of the first to third separation plates 17, 19, 21 is downstream of the gas passage 16. A small hole 23a is formed to guide the light.

  As shown in FIGS. 1 and 4, a take-off prevention plate 30 is integrally formed on the inner surface of the upper wall 13 b of the housing 13 downstream of the collision plate 25, and its lower end and the bottom wall 13 a of the housing 13 are suspended. A gap 31 is formed between them. The gas flow that has passed over the collision plate 25 hits the take-away prevention plate 30, and therefore, even if oil is taken away from the collision plate 25 by the gas flow, the oil is separated by the take-out prevention plate 30. .

  As shown in FIG. 2, an oil discharge port 29 is formed in the bottom wall 13 a of the housing 13 so as to be located on the downstream side of the collision plate 25. Then, the oil that is separated by the separation surfaces 17a, 19a, 21a of the first to third separation plates 17, 19, 21 and the collision portion 25a of the collision plate 25 and the take-away prevention plate 30 and flows down to the upper surface of the bottom wall 13a, The oil is discharged from the oil discharge port 29 into the cylinder head cover 12 and returned to an oil pan (not shown) to be used for lubricating a movable part such as a cam shaft.

  When the engine is operated, blow-by gas generated by the operation is sucked into the housing 13 from the gas inlet 14 shown in FIG. 1 due to the negative pressure of the gas outlet 15 caused by the intake of the engine. The gas flows along the passage 16 toward the gas outlet 15. The blow-by gas flowing into the gas passage 16 from the gas inlet 14 passes through the gaps 18, 20, 22 between the end edges and the housing 13 by the action of the first to third separation plates 17, 19, 21. It flows while meandering. In this process, oil mist having a large particle size remaining in the blow-by gas adheres to the inner surface of the upper wall 13b of the housing 13, the separation surfaces 17a, 19a, 21a of the first to third separation plates 17, 19, 21 and the like. To be separated.

  The oil separated by the separation surfaces 17 a, 19 a, 21 a of the first to third separation plates 17, 19, 21 is the lower end portions of the first and third separation plates 17, 21, the partition wall 23, and the collision plate 25. Through the small holes 17 b, 21 b, 23 a, and 25 b formed in the gas passage 16, the gas flows to the downstream side of the gas passage 16, and is led to the oil discharge port 29.

  Further, the blow-by gas that has passed through the gap 22 between the upper end edge of the third separation plate 21 and the upper wall 13b of the housing 13 is accelerated through each orifice 24 of the partition wall 23, and enters the collision portion 25a of the collision plate 25. It is sprayed toward. And when gas collides with the collision part 25a, the oil mist with a small particle size contained in the gas will adhere to the collision part 25a, and will be separated and captured. In this case, since the water repellent / oil repellent treatment surface 27 is formed in the collision part 25a, the oil mist separated and captured does not stay on the collision part 25a but is aggregated in the form of liquid droplets, and then the own weight. And it moves to the circumference | surroundings of the collision part 25a by a gas flow. Moreover, since the hydrophilic / lipophilic treatment surface 28 is provided around the collision portion 25a, the oil mist moved from the collision portion 25a quickly flows down while being attached to the treatment surface 28.

  The blow-by gas from which the oil mist has been separated passes through the gaps 26 on both sides of the collision plate 25 and is carried away by the anti-plate 30 and undergoes a gas separation action. Accordingly, even if a small amount of oil is contained in the gas flow, the oil is separated, and the gas flow is returned to the engine intake system from the gas outlet 15 through the gap 31 below the carry-off prevention plate 30. .

  The oil that has flowed down from the collision plate 25 and the carry-out prevention plate 30 flows to the downstream side of the gas passage 16 through the small holes 25b and the bottom wall 13a formed in the lower end portion of the collision plate 25, and is discharged from the oil discharge port 29. Is done.

Therefore, according to this embodiment, the following effects can be obtained.
(1) In this oil separator, an orifice 24 for accelerating the gas flow is provided in a part of the gas passage 16 through which the oil mist-containing gas flows, and a collision portion where the gas flow collides with the downstream side of the orifice 24. 25a is provided. A water repellent / oil repellent treated surface 27 is formed in the collision portion 25a. For this reason, the oil mist separated and captured by the collision part 25a can be moved from the collision part 25a to the surroundings and can be quickly recovered. Therefore, the oil mist separated in the collision part 25a can be prevented from being scattered again by the gas flow, and the oil mist separation performance can be improved.

  (2) In this oil separator, a hydrophilic / lipophilic treatment surface 28 is provided around the collision portion 25a. For this reason, it is possible to prevent the oil mist separated by the collision portion 25a from being taken away by the gas flow. Therefore, it is possible to more effectively suppress the oil mist separated in the collision portion 25a from being scattered again by the gas flow, and the oil mist separation performance can be improved.

  (3) In this oil separator, an oil separation configuration including a plurality of separation plates 17, 19, and 21 and an oil separation configuration including an orifice 24 and a collision portion 25a are arranged in the gas passage 16 of the oil mist-containing gas. Has been. For this reason, by both oil separation structure, it can isolate | separate in order from oil mist with a large particle size contained in gas to oil mist with a small particle size, and can further improve the separation performance of oil mist.

  (4) In this oil separator, the gas flow that has passed over the collision plate 25 is carried away and hits the prevention plate 30 to be subjected to gas separation. Therefore, even if the oil is carried away from the collision plate 25 by the gas flow, the oil can be effectively separated and recovered.

(Second Embodiment)
Next, a second embodiment of the oil separator embodying the present invention will be described with a focus on differences from the first embodiment. In addition, in each embodiment and modification of this 2nd Embodiment, it demonstrates centering on a different part from 1st Embodiment.

  In the second embodiment, as shown in FIG. 5, the collision portion 25 a on the collision plate 25 is configured by a substantially hemispherical protrusion protruding from the processing surface 28. Accordingly, the collision portion 25a has a circular shape in a cross section parallel to the gas flow. A water / oil repellent treatment surface 27 is formed on the entire surface of the collision portion 25a including the top surface of the collision portion 25a made of this hemispherical protrusion.

Therefore, according to the second embodiment, in addition to the effects described in (1) to (3) in the first embodiment, the following effects can be obtained.
(5) In this oil separator, the collision part 25 a is constituted by a protrusion protruding from the processing surface 28. For this reason, the oil mist separated and captured by the collision part 25a can be smoothly moved from the collision part 25a to the surrounding hydrophilic / lipophilic treatment surface 28 with a height difference, and the oil mist separation performance can be further improved. Can be improved.

(Third embodiment)
Next, a third embodiment of the oil separator embodying the present invention will be described.
In the third embodiment, as shown in FIG. 6, the collision portion 25 a on the collision plate 25 is constituted by a substantially truncated cone-shaped projection protruding from the processing surface 28. Accordingly, the collision portion 25a has a trapezoidal shape in a cross section parallel to the gas flow. A water repellent / oil repellent treated surface 27 is formed on the entire surface of the collision portion 25a made of the frustoconical protrusion.

Therefore, according to the third embodiment, substantially the same effects as those described in the first and second embodiments can be obtained.
(Fourth embodiment)
Next, a fourth embodiment of an oil separator embodying the present invention will be described.

  In the fourth embodiment, as shown in FIGS. 7 and 8, the orifice 24 is formed in a horizontally long slit shape. Further, the collision portion 25 a is formed to be elongated so as to correspond to the orifice 24. And this collision part 25a is comprised by the leg part 25c of both ends, and the top wall 25d as a top part constructed between the both leg parts 25c. A water / oil repellent treatment surface 27 is formed on the outer surface (top surface) of the top wall 25d. An oil passage hole 25e penetrating in the vertical direction is formed between both leg portions 25c at the base of the collision portion 25a. The hydrophilic / lipophilic surface 28 is formed on the entire side surface of the collision plate 25 including the oil passage hole 25e. Further, a gap 26 through which the gas flow collided with the collision portion 25a is formed downstream is formed between the upper end of the collision plate 25 and the upper wall 13b of the housing 13. The carry-out prevention plate 30 is not provided.

Therefore, in the fourth embodiment, the following effects can be obtained.
(6) Since the oil mist is separated by the elongated water / oil repellent treatment surface 27 corresponding to the slit-like orifice 24, efficient separation is possible.

(7) The separated oil mist smoothly flows downward through the oil passage hole 25e and is collected.
(Example of change)
In addition, this embodiment can also be changed and embodied as follows.

The orifice 24 of the partition wall 23 and the water / oil repellent treatment surface 27 of the collision portion 25a are arranged side by side in the vertical direction, arranged in both vertical and horizontal directions, or arranged obliquely.
The collision part 25a is constituted by a protrusion having a quadrangular cross section such as a columnar shape.

The collision plate 25 is suspended from the upper wall 13b of the oil separator 11 so that a gap 26 between the inner surface of the housing 13 and the collision plate 25 is formed in the lower portion of the housing 13.
In the first to third embodiments shown in FIGS. 1 to 6, the carry-out prevention plate 30 is omitted.

  In the first to third embodiments, the hydrophilic / lipophilic treatment surface 28 is formed on the entire side surface of the collision plate 25.

  DESCRIPTION OF SYMBOLS 11 ... Oil separator, 13 ... Housing, 14 ... Gas inlet, 15 ... Gas outlet, 16 ... Gas passage, 17, 19, 21 ... Separation plate, 17a, 19a, 21a ... Separation surface, 23 ... Partition, 24 ... Orifice, 25 ... collision plate, 25a ... collision part, 27 ... water / oil repellent surface, 28 ... hydrophilic / lipophilic surface.

Claims (5)

In an oil separator that forms a passage through which oil mist-containing gas flows,
An orifice for accelerating the gas flow is provided in a part of the passage, and a collision part where the gas flow collides is provided on the downstream side of the orifice,
Oil separator, characterized in that said to form a water-repellent oil repellent treatment surface collision portion, provided with a hydrophilic-lipophilic-treated surface around the collision portion. The oil separator according to claim 1 , wherein the collision portion is constituted by a protrusion protruding from the hydrophilic / lipophilic treatment surface. The oil separator according to claim 2 , wherein the protrusion is formed in a circular shape in a cross section parallel to the gas flow. The oil separator according to claim 2 , wherein the protrusion is formed in a trapezoidal shape in a cross section parallel to the gas flow. The oil separator according to claim 4 , wherein the water / oil repellent surface is formed on a top surface of the protrusion.

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