JP2015132247A - oil separator - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an oil separator capable of efficiently trapping oil mist.SOLUTION: A separator 11 is connected into a flow path 100 for blow-by gas. A drain 33 is formed in a lower wall part. A filter 34 is provided in the separator 11. The filter 34 is comprises of a filter frame 35, and an element 36 formed of a non-woven fabric or a porous material, and mounted on the face of the filter frame 35 at the gas flow upstream side. In the outer periphery of the filter frame 35, a short cylindrical flange 39 is formed which is protruded toward the gas downstream side. In the top face of the flange 39, an inclined surface 40 is formed. Oil mist in gas are trapped by the element 36. Oil trapped by the element 36 and oil deposited on the outer periphery side of the filter frame 35 are collected from the drain 33 after passing from the inclined surface 40 of the flange 39 through an oil groove 41.

Description

  The present invention relates to an oil separator for recovering oil mist contained in a gas flow such as blow-by gas.

This type of oil separator is disclosed in Patent Document 1 and Patent Document 2.
In Patent Document 1, the gas flow collides with a collection plate having a porous material, and oil mist is captured by the porous material. The captured oil is collected through an oil drain pipe below the collection plate.

  In Patent Document 2, after the gas flow collides with the downward collision surface and the oil mist is captured, the oil mist is captured by the filter when the gas flow passes through the filter.

JP-A-9-47617 JP 2001-54711 A

  However, in Patent Document 1, since the path through which the captured oil falls to the oil drain pipe intersects with the path of the gas flow, a significant proportion of the separated oil is downstream of the gas flow. There is a risk that it will be mixed into the gas flow again. Further, the oil moved to the back side of the collecting plate by the gas flow may be mixed into the gas flow again.

  Moreover, in Patent Document 2, since the path through which the captured oil falls to the oil drain pipe and the gas flow path face each other in opposite directions, a considerable amount of the separated oil is used. There was a risk that the ratio would be mixed into the gas stream again. In addition, in Patent Document 2, since the gas flow passes through the filter and is discharged as it is, the oil may be taken out by the gas flow when a large amount of oil is held in the filter.

  An object of the present invention is to provide an oil separator capable of efficiently capturing oil mist.

  In order to achieve the above object, in the present invention, in an oil separator provided with a capturing member for capturing oil contained in a gas in a gas flow path in a housing, the downstream side of the gas flow from the capturing member A drain is provided at a lower portion of the housing with a gap therebetween, and a groove extending along the gas flow direction is formed between the drain and the capturing member.

  Therefore, in the above configuration, the oil mist is captured by the capturing member, and the oil flowing down from the capturing member flows along the oil groove and reaches the drain. Accordingly, the oil is substantially separated from the gas flow in the oil groove, and the separated oil flows toward the drain in the oil groove with almost no influence of the gas flow. For this reason, the oil can be efficiently recovered while suppressing re-mixing of the oil into the gas flow.

  According to the present invention, oil can be efficiently recovered from a gas stream.

Sectional drawing which shows the separator of embodiment. The disassembled perspective view of the separator of FIG. Sectional drawing which shows a filter part. Sectional drawing which shows the flowing-down state of oil. Sectional drawing which shows the separator of another embodiment.

Hereinafter, embodiments will be described.
As shown in FIG. 1, an oil separator (hereinafter simply referred to as a separator) 11 according to an embodiment is connected between pipes 101 and 102 constituting a blow-by gas flow path 100. The flow path 100 is connected between an engine crank chamber (not shown) and an engine intake system (not shown) on the downstream side of an air cleaner (not shown). The blow-by gas containing oil mist is sucked into the intake system through the flow path 100 mainly based on the negative pressure of the engine intake system. At this time, the oil mist is separated from the blow-by gas flow in the separator 11 and collected in a cylinder head cover (not shown) of the engine.

  As shown in FIGS. 1 and 2, the housing 12 of the separator 11 is formed in a cylindrical shape, and the first cylindrical body 13 on the upstream side of the gas flow and the second cylindrical body 14 on the downstream side thereof have end faces thereof. It is fixed in. The end of the first cylindrical body 13 on the upstream side of the gas flow and the end of the second cylindrical body 14 on the downstream side of the gas flow become small diameter connecting portions 15 and 16 connected to the pipes 101 and 102, respectively. Yes.

  Large-diameter mist separating portions 17 and 18 are formed on the downstream side of the first cylindrical body 13 and the upstream side of the second cylindrical body 14, respectively, and the insides thereof become mist separating chambers 19 and 20 that communicate with each other. ing. A nozzle 31 that protrudes toward the radial center of the mist separation chamber 19 is formed at the downstream end of one connecting portion 15. The inner diameter of the nozzle 31 is formed smaller than the inner diameter of the connection portion 15, and the gas flow is accelerated by the nozzle 31 and injected into the mist separation chamber 19. A cylindrical flange 32 is formed at the upstream end of the other connection portion 16, and even if oil adheres to the inner wall surface of the mist separation chamber 20, the oil is connected to the connection portion 16 side. It is suppressed that it flows into.

  A drain 33 is formed in the lower wall portion of the mist separating portion 17 on the downstream side. The drain 33 is connected to the cylinder head cover via a pipe (not shown), and the oil in the mist separation chamber 20 is collected in the cylinder head cover.

  Between the first cylindrical body 13 and the second cylindrical body 14, a filter 34 as a capturing member constituting a capturing member is provided on the upstream side of the drain 33 so as to oppose the gas flow. The filter 34 includes a filter frame 35 and an element 36 made of a nonwoven fabric or a porous material attached to the surface of the filter frame 35 on the gas flow upstream side. The drain 33 is arranged at an interval from the filter 34 on the downstream side of the gas flow.

  As shown in FIGS. 2 and 3, the filter frame 35 has a first leg 37 extending in the radial direction at three locations on the outer periphery excluding the lower part, and a pair of second legs 38 that are parallel on the outer periphery of the lower part. The legs 37 and 38 are fixed to a portion between the first cylindrical body 13 and the second cylindrical body 14. In addition, the 1st cylindrical body 13, the 2nd cylindrical body 14, and the filter frame 35 are comprised by synthetic resin, and vibration welding, adhesion | attachment using an adhesive agent, etc. are employ | adopted in those mutual fixation.

  As shown in FIGS. 3 and 4, a short cylindrical flange 39 that protrudes toward the gas downstream side is formed on the outer periphery of the filter frame 35. An inclined surface 40 located on the downstream side of the gas flow is formed. The inclined surface 40 is continuous with the surface of the second leg 38 on the downstream side of the gas flow.

An oil groove 41 extending along the gas flow direction is formed in the lower inner wall of the second cylindrical body 14 from the position between the lower end portions of the second legs 38 to the drain 33.
As shown in FIG. 3, a gap 42 through which a gas flow passes is formed between the outer periphery of the filter frame 35 and the inner peripheral surfaces of the mist separating portions 17 and 18.

Next, the effect | action of the separator 11 of embodiment is demonstrated.
Blow-by gas containing oil mist from the clan case is introduced into the separator 11 through the flow path 100 by the intake action of the engine. The blow-by gas introduced into the connecting portion 15 on the upstream side of the first cylindrical body 13 of the separator 11 is injected from the nozzle 31 into the mist separation chambers 19 and 20 and blown against the element 36. For this reason, most of the oil mist in the gas flow is captured by the element 36. The captured oil naturally flows down in the element 36 and is collected in the oil groove 41. Further, the oil 50 that is not captured by the element 36 and adheres to the outer peripheral side of the filter frame 35 is moved to the back side of the filter frame 35 by the gas flow passing through the gap 42 as shown in FIG. It flows down into the oil groove 41 along the inclined surface 40 of the flange 32 on the back surface of the frame 35 and the second leg 38.

The oil in the oil 41 groove is collected in the cylinder head cover through the drain 33.
The blow-by gas from which the oil mist has been separated passes through the gap 42 between the outer peripheral side of the filter frame 35 and the mist separation chambers 19 and 20, is led out from the second cylindrical body 14 into the flow channel 100, and its flow Returned from the road 100 to the intake system of the engine. At this time, even if oil adheres to the inner wall of the mist separation chamber 19 and the oil is to be transported by the gas flow, the oil is blocked by the flange 32 of the connecting portion 16.

The embodiment has the following effects.
(1) A drain 33 is provided at the lower portion of the housing with a gap downstream from the filter 34 constituting the capturing member, and the drain 33 and the filter 34 are provided along the direction of the gas flow. An oil groove 41 that extends is formed. For this reason, the oil that has been captured and flowed down by the filter 34 flows along the oil groove 41 and reaches the drain 33. Therefore, the oil separated from the gas stream can be recovered efficiently.

  (2) The filter 34 includes a filter frame 35 fixed to the inner surface of the separator 11 so as to block the gas flow, and an element 36 provided on the front surface of the filter frame 35, and the filter frame 35 and the separator 11. A gap 42 for the gas to flow is formed between the inner circumferential surface and the inner circumferential surface. Accordingly, the gas flow from which the oil has been separated flows at high speed in the gap 42, and the oil at the outer peripheral portion of the filter frame 35 is moved to the back side of the filter frame 35 by this high speed flow. It flows down along the inclined surface 40 of 35 and the surface of the second leg 38 on the downstream side of the gas flow. For this reason, since the gas flow flows on both sides of the inclined surface 40 of the filter frame 35 and the surface of the second leg 38 on the downstream side of the gas flow, the oil flowing down is different from the case where oil is dropped in the gas flow. There is little exposure in the gas stream. Accordingly, the oil that flows down is prevented from being taken out by the gas flow, and can be appropriately recovered from the oil groove 41 via the drain 33.

  (3) Moreover, since the oil groove 41 is disposed between the lower ends of the second legs 38, the second leg 38 covers the oil in the oil groove 41 from both sides and prevents the gas flow from hitting the oil. It will serve as a wall. For this reason, it is possible to more effectively prevent oil from being taken out by the gas flow.

  (4) First and second legs 37 and 38 project from the outer periphery of the filter frame 35, and the legs 37 and 38 are fixed to the inner peripheral surface of the housing 12. Therefore, the filter frame 35 can be firmly fixed to the housing 12 and a gap 42 for gas flow can be formed between the filter frame 35 and the inner wall surface of the housing 12.

  (5) A pair of second legs 38 that are parallel to the lower portion of the filter frame 35 are projected, and an oil groove 41 is disposed between the second legs 38. Therefore, the oil that has flowed down through the filter frame 35 is prevented from being mixed into the gas flow again, and can be appropriately recovered through the oil groove 41.

  (6) A short cylindrical flange 39 is formed around the filter frame 35, and the top surface of the flange 39 is formed in an inclined shape protruding toward the downstream side of the gas flow toward the lower side. Therefore, re-mixing of the oil film and oil droplets adhering to the top surface of the flange 39 into the gas flow can be suppressed. In other words, even if a force that removes the gas flow acts on the oil film or oil droplet, the force generates a downward force on the oil film or oil drop. Power is reduced. On the other hand, when the top surface of the flange 39 is not inclined but is along the surface in the vertical direction, the take-off force of the gas flow directly acts on the oil film and the oil droplets. It is easy to be mixed in.

  (7) Since the inclined surface 40 of the flange 39 is continuous with the downstream rear surface of the second leg 38, the oil on the flange 39 smoothly flows down from the inclined surface 40 to the downstream surface and the oil groove 41. And is recovered from the drain 33.

The embodiment may be modified as follows.
As shown in FIG. 5, a collision plate 43 is provided so as to face the nozzle 31 instead of the element 36 made of the nonwoven fabric or porous material of the above embodiment. In this way, the gas flow from the nozzle 31 collides with the collision plate 43, and the oil mist can be separated.

  -Change the number of the first legs 37 to 2 or 4 or more, or the number of the second legs 38 to 1.

  DESCRIPTION OF SYMBOLS 11 ... Separator, 12 ... Housing, 32 ... Flange, 33 ... Drain, 34 ... Filter, 135 ... Filter frame, 35 ... Element, 37 ... First leg, 38 ... Second leg, 39 ... Flange, 40 ... Inclined surface, 41 ... oil groove, 42 ... gap.

Claims (6)

In the oil separator provided with a capturing member for capturing oil contained in the gas in the gas flow path in the housing,
An oil separator in which a drain is provided at a lower portion of the housing with a gap downstream of the gas flow from the capture member, and a groove extending along the gas flow direction is formed between the drain and the capture member. The capture member is composed of a frame fixed to the inner surface of the housing so as to block the gas flow, and a filter provided on the front surface of the frame, so that gas flows between the frame and the inner peripheral surface of the housing. The oil separator according to claim 1, wherein a gap is formed. The oil separator according to claim 2, wherein legs are provided on the outer periphery of the frame, and the legs are fixed to the inner peripheral surface of the housing. The oil separator according to claim 3, wherein a pair of legs parallel to the lower part of the frame is provided so as to project the groove between the legs. The oil separator according to claim 4, wherein a cylindrical flange is formed around the frame, and a top surface of the flange is formed in an inclined shape protruding toward the downstream side of the gas flow toward the lower side. The oil separator according to claim 5, wherein both ends of the top surface of the flange are connected to the rear surfaces of the legs.