JP2016217326A - Mist separator - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a mist separator capable of maintaining the preferable oil mist removal performance even if the flow rate of blow-by gas fluctuates as the operating condition changes.SOLUTION: The present invention relates to a mist separator 2, in which after the flow of a blow-by gas 1 is squeezed at a nozzle opening 9 so as to increase the current speed, the blow-by gas 1 bypasses a baffle plate 11, and the oil mist contained in the blow-by gas 1 is moved straight by inertia during the bypassing so that the oil mist collides with the baffle plate 11 and drops into an oil drain 12, which is positioned directly beneath the baffle plate 11, to be recovered. The mist separator includes: a slide valve 13 that partially overlaps the nozzle opening part 9 to increase or decrease the opening area of the nozzle opening 9; and an actuator 14 (an operation device) that moves the slide valve 13 to an appropriate position.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a mist separator.

  The blow-by gas that leaks into the crankcase through the gap between the piston rings during the compression stroke and explosion stroke of the engine fills the crankcase and the cylinder head cover that communicates with the crankcase. The crankshaft and connecting rod are moving at high speed in the crankcase, and the rocker arm and valve are operating in the cylinder head cover communicating with the crankcase. The inside is filled with oil mist.

  For this reason, if the blow-by gas is released into the atmosphere as it is, the oil mist mixed with the blow-by gas may be discharged to the outside. Therefore, as shown in FIG. 11, the oil mist in the blow-by gas 1 A mist separator 2 for separating and recovering oil is provided, and blow-by gas 1 extracted from a cylinder head cover of an engine (not shown) is passed through the mist separator 2 so that oil mist is separated and recovered and then returned to the intake pipe.

  Here, the separator body 3 that forms the outer shell of the mist separator 2 is configured to flow the blow-by gas 1 introduced from the inlet 4 on one end side to the outlet 5 on the other end side. The front chamber 7 and the rear chamber 8 are divided into two, and the partition wall 6 is provided with a nozzle opening 9 that narrows the flow of the blow-by gas 1, and faces the nozzle opening 9 in the rear chamber 8. In the position, baffle plates 11 each having an oil droplet filter 10 attached to the opposite surface are arranged at a predetermined interval.

  For this reason, the blow-by gas 1 introduced from the inlet 4 of the front chamber 7 is increased in flow velocity by being throttled at the nozzle opening 9 and hits the baffle plate 11, bypassing the baffle plate 11 and bypassing the rear chamber 8, the oil mist contained in the blow-by gas 1 travels straight due to inertia and collides with the oil droplet filter 10 and is captured by the oil droplet filter 10. It is dropped directly onto the oil drain 12 immediately below the baffle plate 11 and is collected in an oil pan or the like (not shown).

  In addition, the following patent document 1 etc. are already proposed as prior art document information which proposes the technique which isolate | separates and collects oil mist from blowby gas.

JP 2009-133235 A

  However, in this type of mist separator 2, there is an optimum flow velocity range for separating and collecting the oil mist contained in the blow-by gas 1, whereas when the flow rate of the blow-by gas 1 fluctuates as the operating state changes. There is a problem that the flow rate set by narrowing the flow at the nozzle opening 9 also fluctuates and the optimum flow velocity range cannot be maintained, and there is a possibility that the oil mist removal performance is deteriorated outside a specific operation range. there were.

  The present invention has been made in view of the above circumstances, and an object thereof is to provide a mist separator that can maintain good oil mist removal performance even when the flow rate of blow-by gas varies with changes in operating conditions. .

  In the present invention, the flow of the blow-by gas is reduced at the nozzle opening to increase the flow velocity, and then the baffle plate is detoured.At the time of the detour, the oil mist contained in the blow-by gas is caused to travel straight by inertia and collide with the baffle plate. And a mist separator that is dropped and collected on an oil drain immediately below the baffle plate, and a slide valve that increases or decreases the opening area of the nozzle opening by partially overlapping the nozzle opening, And an actuating device that moves the slide valve to an appropriate position.

  Thus, in this way, even if the flow rate of blow-by gas fluctuates with changes in the operating state, the opening area of the nozzle opening is increased or decreased by moving the slide valve to an appropriate position by the operating device, It is possible to maintain the flow rate of the blow-by gas passing through the nozzle opening in an optimum flow rate range, and it is possible to avoid a decrease in oil mist removal performance.

  Furthermore, when concretely carrying out the present invention, the actuator may be configured to increase or decrease the opening area of the nozzle opening by moving the slide valve to an appropriate position by driving the actuator. By doing so, it is possible to drive the actuator in response to changes in the operating state, thereby controlling the slide valve to an appropriate movement position and reliably increasing or decreasing the opening area of the nozzle opening. High blow-by gas flow rate control can be realized.

  Further, the operating device may be configured to increase or decrease the opening area of the nozzle opening by moving the slide valve to an appropriate position by the balance between the pressure on the inlet side of the nozzle opening and the projectile. By doing so, it becomes possible to move the slide valve using the pressure at the inlet side of the nozzle opening without relying on driving of an actuator or the like, simplifying the mechanism for moving the slide valve, and reducing the equipment cost. Reduction can be achieved.

  Furthermore, in the present invention, an edge portion having an acute cross section is formed on the outer edge of a portion that partially overlaps with the nozzle opening portion in the slide valve, and the edge portion can be configured to scrape off deposits around the nozzle opening portion. It is preferable that

  In this way, even if deposits (incomplete combustion products) and frozen condensed water adhere to the periphery of the nozzle opening, these deposits are scraped off by the edge when the slide valve moves, and the nozzle opening Blockage due to the growth of deposits on the part is prevented.

  According to the mist separator of the present invention described above, various excellent effects as described below can be obtained.

  (I) According to the invention described in claim 1 of the present invention, even if the flow rate of blow-by gas fluctuates with a change in the operating state, the slide valve is moved to an appropriate position by the actuating device to Since the opening area can be increased or decreased, and the flow rate of the blow-by gas passing through the nozzle opening can be maintained in the optimum flow rate region, good oil mist removal performance can be maintained.

  (II) According to the invention described in claim 2 of the present invention, the actuator is driven in response to a change in the operating state, thereby controlling the slide valve to an appropriate moving position and reliably opening the nozzle opening. Since the area can be increased or decreased, the flow rate control of the blow-by gas with high accuracy can be realized.

  (III) According to the invention described in claim 3 of the present invention, the slide valve can be moved using the pressure on the nozzle opening side without depending on the drive of the actuator or the like. It is possible to simplify the mechanism for movement and reduce the equipment cost.

  (IV) According to the invention described in claim 4 of the present invention, even if deposits (incomplete combustion products) or frozen dew condensation water adheres around the nozzle opening, these deposits are removed from the slide valve. Since it can be scraped off by the edge during movement, it is possible to prevent clogging of the nozzle opening due to the growth of deposits.

It is side surface sectional drawing which shows an example of the form which implements this invention. It is sectional drawing of the II-II arrow of FIG. It is a figure which shows the state which the slide valve moved from the state of FIG. It is front sectional drawing which shows another example of this invention. It is a figure which shows the state which the slide valve moved from the state of FIG. It is front sectional drawing which shows another example of this invention. It is sectional drawing of the VII-VII arrow of FIG. . It is a figure which shows the state which the slide valve moved from the state of FIG. It is front sectional drawing which shows another example of this invention. It is sectional drawing of the XX arrow of FIG. It is side surface sectional drawing which shows a prior art example.

  Embodiments of the present invention will be described below with reference to the drawings.

  FIG. 1 and FIG. 2 show an example of an embodiment for carrying out the present invention. Similarly to the conventional example of FIG. 11 described above, the blow-by gas 1 introduced from the inlet 4 at one end is used as the outlet 5 at the other end. Separator body 3 that is allowed to flow to, a partition wall 6 that divides the interior of separator body 3 into a front chamber 7 on the inlet 4 side and a rear chamber 8 on the outlet 5 side, and is opened in the partition wall 6 to blow-by. A nozzle opening 9 that narrows the flow of the gas 1 and a baffle plate 11 that is suspended from the ceiling at a position facing the nozzle opening 9 in the rear chamber 8, and the flow of the blow-by gas 1 introduced from the inlet 4 is a nozzle The baffle plate 11 is detoured to the outlet 5 after being squeezed through the opening 9 to increase the flow velocity, and the oil mist contained in the blow-by gas 1 is moved straight by inertia during the detour to make oil in the baffle plate 11. Collision through drop filter 10 The mist separator 2 is dropped onto the oil drain 12 directly below the baffle plate 11 and recovered, but moves along the partition wall 6 and partially overlaps the nozzle opening 9. The present invention is characterized in that a slide valve 13 that increases or decreases the opening area of the nozzle opening 9 and an actuator 14 (actuating device) that moves the slide valve 13 to an appropriate position are provided.

  In the example shown here, the slide valve 13 is formed in a J-shape when viewed from the flow direction of the blow-by gas 1 and is installed so as to be able to traverse in the left-right direction. Is arranged and opened. A rack 15 is formed linearly in the left-right direction at the upper end of the slide valve 13, and a pinion 16 that is rotationally driven by the actuator 14 is engaged with the rack 15. Is rotated by the actuator 14 so that the slide valve 13 can be traversed to an appropriate position so that the opening area of the nozzle opening 9 can be increased or decreased.

  Thus, even if the flow rate of the blow-by gas 1 fluctuates with changes in the operating state, the slide valve 13 is moved to an appropriate position via the rack 15 by rotating the pinion 16 by the actuator 14. By moving it, the opening area of the nozzle opening 9 can be increased or decreased, and the flow rate of the blow-by gas 1 passing through the nozzle opening 9 can be maintained in the optimum flow rate range, and the reduction in oil mist removal performance can be avoided in advance. It becomes possible to do.

  That is, in the state shown in FIG. 2, the nozzle opening 9 is fully opened and the maximum opening area is reached. However, as shown in FIG. 3, the slide valve 13 is moved leftward in FIG. If they are overlapped, the opening area is reduced according to the amount of overlap.

  In addition, since the operating condition of the engine (not shown) is grasped by a control unit (ECU) that controls the engine, an appropriate opening area of the nozzle opening 9 according to the operating condition of the engine is controlled by this control unit. The movement position of the slide valve 13 that can realize the above is designated, and the actuator 14 is controlled to aim at the designated movement position.

  Therefore, according to the above embodiment, even if the flow rate of the blow-by gas 1 fluctuates with a change in the operating state, the actuator 14 rotates the pinion 16 to move the slide valve 13 to an appropriate position, thereby opening the nozzle. Since the opening area of the part 9 is increased or decreased, and the flow rate of the blow-by gas 1 passing through the nozzle opening 9 can be maintained in the optimum flow rate region, good oil mist removal performance can be maintained, especially In the present embodiment, the actuator 14 is driven in response to a change in the operating state, whereby the slide valve 13 is controlled to an appropriate movement position, so that the opening area of the nozzle opening 9 can be increased or decreased reliably. The flow rate control of the blow-by gas 1 with high accuracy can be realized.

  Here, in the example of FIGS. 1 to 3, an example in which the single nozzle opening 9 is formed is shown. However, as in the example shown in FIG. 4, the separator main body 3 is formed in a cylindrical shape on the partition wall 6. The four nozzle openings 9 in the figure may be arranged in the circumferential direction. In this case, U-shaped notches 17 are provided in all directions so that the nozzle openings 9 can be fully opened. A cross-shaped slide valve 13 is pivotally mounted about a central rotary shaft 18, and a rack 15 is formed in an arc shape on any outer peripheral portion of the wing portion extending in the four directions of the slide valve 13. 15 is engaged with a pinion 16 that is rotationally driven by an actuator 14, and the pinion 16 is rotationally driven by the actuator 14 to rotate the slide valve 13 to an appropriate rotational position, thereby increasing or decreasing the opening area of the nozzle opening 9. Can It may be so.

  That is, in the state shown in FIG. 4, each nozzle opening 9 is fully opened to have the maximum opening area, but as shown in FIG. 5, the slide valve 13 is rotated counterclockwise in FIG. When the wings are partially overlapped, the opening area is reduced according to the amount of overlap.

  In this way, by setting the plurality of nozzle openings 9 within the limited volume of the separator body 3, it becomes easy to reduce the pressure loss with respect to the flow rate of the blow-by gas 1, and the above-described FIGS. Compared with the type in which the slide valve 13 is traversed in the left-right direction as in the example of FIG. 3, there is an advantage that the separator body 3 can be easily configured compactly.

  6 and 7 show still another example of the present invention. In this embodiment, the operating device for moving the slide valve 13 to an appropriate position is provided with the pressure in the front chamber 7 (nozzle opening 9). The opening area of the nozzle opening 9 can be increased or decreased by moving the slide valve 13 to an appropriate position according to the balance between the pressure on the inlet side and the compression spring 19 (a projectile).

  More specifically, the nozzle opening 9 of the partition wall 6 is formed in the shape of an elongated hole extending in the left-right direction, and the slit portion 20 having a shape substantially matching the elongated hole-shaped nozzle opening 9 is provided. The provided slide valve 13 is installed so as to be able to traverse in the left-right direction. The nozzle opening 9 and the slit portion 20 are displaced from each other by the compression spring 19 in which the slide valve 13 is housed in the storage chamber 21. It is arranged to be urged to a position where the overlapping range is reduced.

  Here, the accommodation chamber 21 in which the compression spring 19 is accommodated is configured such that the inlet opening surface is closed by the lid portion 22 on one side of the slide valve 13, and the pressure in the front chamber 7 is increased. 6, the slide valve 13 traverses in the left direction in FIG. 6 against the repulsive force of the compression spring 19, and the overlapping range of the nozzle opening 9 and the slit portion 20 increases as shown in FIG. The opening area of the opening 9 is increased. In other words, in the case of the example shown here, the actuating device for moving the slide valve 13 is constituted by the compression spring 19, the storage chamber 21, and the lid portion 22.

  Thus, in this way, when the flow rate of the blow-by gas 1 increases as the operating state changes, the pressure in the front chamber 7 rises, and the slide valve 13 moves in the direction in which the opening area of the nozzle opening 9 increases. In addition, when the flow rate of the blow-by gas 1 decreases, the pressure in the front chamber 7 drops and the slide valve 13 is caused to traverse in the direction in which the opening area of the nozzle opening 9 decreases due to the repulsive force of the compression spring 19. Therefore, the slide valve 13 can be moved using the pressure in the front chamber 7 without depending on the driving of the actuator 14 and the like, and the mechanism for moving the slide valve 13 is simplified. Equipment costs can be reduced.

  Further, as shown in FIGS. 9 and 10, a bridge portion 23 (a portion partially overlapping with the nozzle opening 9) is provided in the middle of the slit portion 20 of the slide valve 13, and the left and right outer edges of the bridge portion 23 are provided. An edge portion 24 having an acute cross section may be formed so that deposits around the nozzle opening 9 can be scraped off by the edge portion 24. Even if the complete combustion product) or frozen condensed water adheres, the adhering matter can be scraped off by the edge portion 24 when the slide valve 13 is moved, so that the nozzle opening 9 is blocked by the adhering growth. Can be prevented.

  Note that the mist separator of the present invention is not limited to the above-described embodiments, and the shape and moving direction of the slide valve are not limited to the illustrated examples, and other within the scope not departing from the gist of the present invention. Of course, various changes can be made.

1 Blow-by gas 2 Mist separator 9 Nozzle opening 11 Baffle plate 12 Oil drain 13 Slide valve 14 Actuator (actuator)
19 Compression spring (bullet: actuator)
21 Containment chamber (actuator)
22 Lid part (actuator)
23 Bridge part (part which overlaps with nozzle opening part)
24 Edge part

Claims (4)

  After the flow of blow-by gas is narrowed at the nozzle opening to increase the flow velocity, the baffle plate is detoured, and at the time of detouring, the oil mist contained in the blow-by gas is caused to travel straight by inertia and collide with the baffle plate. A mist separator that is dropped into an oil drain directly below and collected, and a slide valve that increases or decreases the opening area of the nozzle opening by partially overlapping the nozzle opening, and the slide valve is appropriately A mist separator comprising an actuating device for moving to a different position.   The mist separator according to claim 1, wherein the actuating device is configured to increase or decrease the opening area of the nozzle opening by moving the slide valve to an appropriate position by driving the actuator.   The actuating device is configured to increase or decrease the opening area of the nozzle opening by moving the slide valve to an appropriate position according to the balance between the pressure on the inlet side of the nozzle opening and the projectile. Item 2. The mist separator according to Item 1.   An edge portion having an acute cross section is formed on the outer edge of a part of the slide valve that partially overlaps the nozzle opening, and the edge portion is configured to scrape off deposits around the nozzle opening. The mist separator according to claim 1, 2, or 3.

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