JP5894005B2 - Gas-liquid separator - Google Patents

Description

  The present invention relates to a gas-liquid separator that separates a gas-liquid mixture into a liquid and a gas.

  2. Description of the Related Art Conventionally, a gas-liquid separation device that separates oil mist mixed with blow-by gas from blow-by gas by centrifugal force generated by swirling blow-by gas generated in an internal combustion engine is known. When blow-by gas is returned to the intake pipe while containing the oil mist, oil adheres to the inner wall of the intake pipe. In Patent Document 1, a blow-by gas before being introduced into a centrifugal separator that forms a swirl flow is passed through a filter, and the particle size of oil mist contained in the blow-by gas is increased in the filter, whereby the centrifugal separator Describes a mist removing device that improves the separation efficiency of oil mist from blow-by gas.

JP-A-8-93438

  However, in the mist removing apparatus described in Patent Document 1, the filter is provided in an inlet pipe that introduces blow-by gas into the centrifugal separator, and the entire amount of blow-by gas introduced into the centrifugal separator passes through the filter. . For this reason, when the filter is clogged with foreign matter, blow-by gas cannot be introduced into the centrifugal separation section, and recirculation to the intake pipe cannot be performed.

  An object of the present invention is to provide a gas-liquid separation device capable of improving the separation efficiency of a liquid contained in a gas-liquid mixture.

  The present invention is a gas-liquid separation device that separates a gas-liquid mixture into a liquid and a gas, and the gas-liquid mixture is spirally swung along an inner wall so as to swivel from one end to the other end. A swirling means for centrifuging the gas-liquid mixture into liquid and gas by forming a flow, and collecting the liquid mixed in the gas-liquid mixture provided at least for the swirling flow at the innermost radial direction And a filter for aggregating the collected liquid, and the swivel means is formed with a flow path through which the gas-liquid mixture can pass from one end to the other without contacting the filter. Features.

  Of the liquids mixed in the gas-liquid mixture, the liquid having a large particle diameter passes through the path near the inner wall of the swirling means due to the centrifugal force generated by the swirling of the gas-liquid mixture, and therefore easily adheres to the inner wall of the swirling means. Easy to separate from gas-liquid mixture. On the other hand, the liquid having a small particle diameter passes through the path on the radially inner side of the swirling flow even by the centrifugal force, and thus is difficult to be separated from the gas-liquid mixture. In the gas-liquid separation device of the present invention, a filter capable of collecting the liquid passing through the radially inner path of the swirling flow is provided for at least the most radially inner swirling flow. Accordingly, the liquid having a small particle diameter is collected by the filter and aggregated to increase the particle diameter. Thereafter, when the liquid having a larger particle size is separated from the filter, it adheres to the inner wall of the swirling means by centrifugal force and is separated from the gas-liquid mixture. Thereby, the separation efficiency of the liquid mixed in the gas-liquid mixture can be improved.

  In addition, when the filter is clogged with foreign matter other than the liquid mixed in the gas-liquid mixture, the gas-liquid mixture can flow from one end to the other end without contacting the filter. Discharged through. At this time, since the gas-liquid mixture passing through the flow path forms a swirling flow, the liquid is separated by centrifugal force even when the filter is clogged. Thereby, the gas-liquid separation device of the present invention can circulate the gas-liquid mixture while separating the liquid even when the filter is clogged with foreign matter or the like.

1 is a schematic configuration diagram of an intake system of an engine to which an oil mist separation device according to a first embodiment of the present invention is applied. It is sectional drawing of the oil mist separation apparatus by 1st Embodiment of this invention. It is a schematic diagram explaining the aggregation phenomenon of the oil mist in the filter of the oil mist separation apparatus by 1st Embodiment of this invention. It is a characteristic view which shows the test result of the oil mist separation apparatus by 1st Embodiment of this invention. It is sectional drawing of the oil mist separation apparatus by 2nd Embodiment of this invention. It is sectional drawing and the principal part enlarged view of the oil mist separation apparatus by 3rd Embodiment of this invention. It is sectional drawing of the oil mist separation apparatus by 4th Embodiment of this invention. It is sectional drawing and the principal part enlarged view of the oil mist separation apparatus by 5th Embodiment of this invention. It is sectional drawing of the oil mist separation apparatus by 6th Embodiment of this invention. It is sectional drawing of the oil mist separation apparatus by 7th Embodiment of this invention. It is sectional drawing of the oil mist separation apparatus by 8th Embodiment of this invention. It is sectional drawing of the oil mist separation apparatus by 9th Embodiment of this invention.

Hereinafter, a plurality of embodiments of the present invention will be described with reference to the drawings.
(First embodiment)
A gas-liquid separator according to a first embodiment of the present invention is shown in FIGS. The oil mist separator 11 as a “gas-liquid separator” is applied to a vehicle on which the engine 10 is mounted.

  FIG. 1 shows a schematic configuration diagram of an intake system of an engine 10 to which an oil mist separator 11 is applied. Air supplied to the engine 10 is introduced into the intake pipe 4 through the air cleaner 2. The amount of air flowing through the intake pipe 4 is adjusted to the amount introduced into the engine 10 by the throttle 3 provided in the intake pipe 4, and the fuel is mixed by the injection 5 provided in the intake pipe 4. An arrow A in FIG. 1 indicates the flow direction of intake and exhaust with respect to the engine 10.

  In the engine 10, the mixture of fuel and air is sucked into the cylinder block 106 by opening the intake valve 101. The air-fuel mixture is compressed by the reciprocating motion of the piston 105 and burned by the spark plug 103. The post-combustion gas in the cylinder block 106 after combustion flows from the cylinder block 106 to the exhaust pipe 6 when the exhaust valve 102 is opened, and is exhausted outside the engine 10. After the combustion gas in the cylinder block 106 is exhausted, the mixture of fuel and air is sucked into the cylinder block 106 by opening the intake valve 101 again. By repeating this, the engine 10 generates a driving force for driving the vehicle.

  In the operation of the engine 10 described above, a mixture of fuel and air sucked into the cylinder block 106 or a post-combustion gas in the cylinder block 106 after combustion is generated between the inner wall of the cylinder block 106 and the outer wall of the piston 105. Leaks into the crankcase 109 through the gap. The crankcase 109 is formed by a cylinder block 106 and an oil pan 108 connected to the lower portion of the cylinder block 106, and accommodates a crank 107 connected to the piston 105. The gas leaked into the crankcase 109 (hereinafter referred to as “blow-by gas”) is introduced into the housing 20 of the oil mist separator 11 through the first connection pipe 30 connected to the cylinder block 106. Note that an arrow B in FIG. 1 indicates the flow direction of blow-by gas that is recirculated from the crankcase 109 to the intake pipe 4 via the oil mist separator 11.

  The oil mist separation device 11 is a gas-liquid separation device that separates liquid and gas contained in the gas-liquid mixture by centrifugal force generated by the rotation of the gas-liquid mixture to be separated. The blow-by gas as the “gas-liquid mixture” in the crankcase 109 includes “liquid” used for lubricating the engine 10 in addition to gas such as air, carbon dioxide, and unburned gas as “gas”. Contains oil mist. In the oil mist separation device 11 according to the first embodiment, the oil mist contained in the blow-by gas is separated from the blow-by gas by the centrifugal force generated by the rotation of the blow-by gas. The blow-by gas from which the oil mist has been separated by the oil mist separation device 11 is supplied to the intake pipe 4 through the second connection pipe 40 and mixed with the air flowing through the intake pipe 4 so that it is regenerated for combustion in the engine 10. Used.

Next, details of the oil mist separator 11 will be described.
The oil mist separator 11 includes a housing 20, a first connection pipe 30, a second connection pipe 40, a filter 21, an oil drain pipe 50, and the like. In the following description, the upper side of FIG. Note that an arrow F in FIG. 2 indicates the flow direction of blow-by gas flowing in the oil mist separator 11.

  The housing 20 includes an introduction part 22, a centrifugal separation part 23, and a discharge part 24 from the top side in the order in which blow-by gas flows. In the housing 20, the blow-by gas introduced into the introduction part 22 (hereinafter referred to as “pre-treatment blow-by gas”) is swirled by the centrifugal separator 23 to separate the oil mist from the pre-treatment blow-by gas and passes through the centrifugal separator 23. Then, the blow-by gas that has reached the discharge section 24 (hereinafter referred to as “processed blow-by gas”) returns to the intake pipe 4 through the second connection pipe 40. The housing 20 corresponds to a “swivel unit” described in the claims.

  The introduction part 22 has a bottomed cylindrical shape, and the inner diameter is formed to be the same as the maximum inner diameter of the centrifugal separation part 23 described later. A bottom wall 221 is formed on the top side of the introduction portion 22 as “one end portion”. An introduction port 31 is formed in the outer wall on the radially outer side of the introduction portion 22. The end of the first connection pipe 30 opposite to the side connected to the cylinder block 106 is connected to the outer wall of the introduction part 22 where the introduction port 31 is formed.

  The centrifugal separator 23 is connected to the end of the introducing portion 22 opposite to the bottom wall 221 side. The centrifuge part 23 has a frustoconical cross section parallel to the central axis of the housing 20, and the inner diameter on the side connected to the introduction part 22 is maximized. The central axis of the housing 20 is coaxial with the central axis of the swirling flow of blowby gas. The centrifugal separator 23 accommodates the filter 21. At this time, the flow path 25 is formed in an annular shape between the outer wall 211 on the radially outer side of the filter 21 and the inner wall 201 of the housing 20. The outer wall 211 corresponds to a “filter outer wall” recited in the claims. The inner wall 201 corresponds to the “inner wall of the turning means” recited in the claims.

  The discharge portion 24 has a bottomed truncated cone shape connected to the end portion of the centrifugal separation portion 23 on the side having the smallest inner diameter. An oil drain pipe 50 is connected to a bottom wall 241 formed on the ground side of the discharge portion 24 as “the other end”. The discharge part 24 accommodates the discharge port 41 of the second connection pipe 40.

  The first connecting pipe 30 is connected to the introduction portion 22 so as to be parallel to the tangential direction of the housing 20 as shown in FIG. Thereby, the blow-by gas introduced into the introduction portion 22 through the first connection pipe 30 forms a swirling flow that rotates in the circumferential direction around the central axis of the housing 20. The first connecting pipe 30 corresponds to an “introducing pipe” recited in the claims.

  As shown in FIG. 2A, the second connection pipe 40 is inserted into the housing 20 from the introduction part 22 side along the central axis of the housing 20. A discharge port 41 formed on the discharge port 24 side of the second connection pipe 40 is provided on the central axis of the discharge unit 24. The second connection pipe 40 corresponds to a “discharge pipe” recited in the claims.

  The filter 21 is formed from a plurality of fibers having lipophilicity and has a truncated cone shape. A through hole through which the second connecting pipe 40 is inserted is formed at the center of the filter 21. That is, the filter 21 is accommodated in the housing 20 while being supported by the outer wall 42 of the second connection pipe 40. The outer wall 211 of the filter 21 and the inner wall 201 of the housing 20 are formed substantially parallel to each other, and the filter 21 is located in the radially inward direction of the swirling flow.

  The oil drain pipe 50 is connected to an opening formed in the bottom wall 241. The oil drain pipe 50 is provided with a check valve 51 that prevents back flow of oil flowing through the oil drain pipe 50. The oil drain pipe 50 discharges the oil on the bottom wall 241 of the discharge part 24 to the outside of the housing 20. The discharged oil is returned to an oil pan (not shown) and used again for lubricating the engine 10.

Next, the operation of the oil mist separator 11 will be described.
Blow-by gas in the crankcase 109 is introduced into the introduction part 22 through the first connection pipe 30. As shown in FIG. 2B, the pre-treatment blow-by gas introduced from the tangential direction of the housing 20 turns from the top side to the ground side of the housing 20 while turning along the inner walls of the introduction part 22 and the centrifugal separation part 23. Moving. That is, the blow-by gas before processing forms a swirling flow in the housing 20.

  The oil mist contained in the pre-treatment blow-by gas moves in the radially outward direction of the housing 20 due to the centrifugal force generated by the rotation of the pre-treatment blow-by gas. The pre-treatment blow-by gas includes oil mists having various particle diameters, and among them, the oil mist having a large particle diameter moves toward the radially outward direction of the housing 20 by centrifugal force.

On the other hand, the oil mist having a small particle diameter turns around the central axis of the housing 20. Oil mist turning around the central axis of the housing 20 is collected by the filter 21.
FIG. 3 is a schematic diagram for explaining the state of oil mist in the filter 21. The oil mist P1 having a small particle size is collected by the filter 21 (part X in FIG. 3). The collected oil mist P1 aggregates with other oil mist collected in the process of moving on the fiber 212 forming the filter 21 along the flow direction of the swirling flow, and increases the particle size (FIG. 3Y). Part). The oil mist P2 having a large particle size formed by aggregating a plurality of oil mists moves away from the filter 21 along the swirl flow (Z in FIG. 3) and moves toward the radially outward direction of the housing 20.

  Oil mist that moves in the radially outward direction of the housing 20 adheres to the inner wall 201. Then, it falls to the bottom wall 241 of the discharge part 24 by gravity. The oil mist that accumulates on the bottom wall 241 passes through the oil drain pipe 50 and is discharged to the outside of the housing 20. As described above, in the oil mist separation device 11, the oil mist having a small particle diameter is collected by the filter 21 and aggregated to increase the particle diameter, and is separated from the blow-by gas by centrifugal force.

  The blow-by gas swirling the centrifugal separator 23 reaches the discharge part 24. The processed blow-by gas in the discharge part 24 flows into the second connection pipe 40 through the discharge port 41 due to the negative pressure in the intake pipe 4 to which the second connection pipe 40 is connected. The processed blow-by gas flowing through the second connection pipe 40 flows into the intake pipe 4.

  The experimental result using the oil mist separation apparatus 11 by 1st Embodiment is shown in FIG. In FIG. 4A, the relationship between the particle size of the oil mist contained in the blow-by gas in the oil mist separator 11 and the separation efficiency is indicated by a broken line L1. Here, the separation efficiency is a value obtained by dividing the difference between the amount of oil mist contained in the blow-by gas before treatment and the amount of oil mist contained in the blow-by gas after treatment by the amount of oil mist contained in the blow-by gas before treatment. In FIG. 4A, as a comparative example, a relationship between the oil mist particle size and the separation efficiency in an oil mist separation apparatus not provided with a filter is indicated by a broken line L2. As shown in FIG. 4A, the oil mist having a particle size of 5 μm or more has a separation efficiency of almost 100% in both the oil mist separator 11 and the oil mist separator of the comparative example. However, in the oil mist having a particle size smaller than 5 μm, the separation efficiency of the oil mist separation device 11 is higher than that of the oil mist separation device of the comparative example. Thereby, the oil mist separation apparatus 11 of 1st Embodiment can improve a separation efficiency compared with a comparative example.

  In the oil mist separator 11 according to the first embodiment, the filter 21 is provided in the radial direction of the swirling flow. At the center of the swirl flow, an oil mist having a small weight, that is, an oil mist having a small particle diameter tends to gather. The filter 21 selectively collects oil mist having a small particle size that easily collects in the center of the swirling flow, and increases the particle size by aggregation. This facilitates separation of oil mist having a small particle size that is difficult to separate by centrifugation. Therefore, it is possible to improve the separation efficiency of oil mist having a particularly small particle size.

  Further, in the oil mist separation device 11 according to the first embodiment, the flow path 25 is formed between the outer wall 211 of the filter 21 and the inner wall 201 of the housing 20. As a result, when the filter 21 is clogged with foreign matter contained in the pre-process blow-by gas, the pre-process blow-by gas introduced into the introduction unit 22 passes through the flow path 25 without passing through the filter 21 and the discharge unit 24. To reach. At this time, in the flow path 25, a swirl flow is formed along the inner wall 201, and oil mist having a relatively large particle size contained in the pre-process blowby gas is separated.

  In FIG.4 (b), the relationship between the flow volume of blow-by gas in the oil mist separation apparatus 11 by 1st Embodiment and the generated pressure loss is shown with the broken line L3. Further, the relationship between the flow rate of blow-by gas and the pressure loss in the oil mist separator of the comparative example is indicated by a broken line L4. As shown in FIG. 4B, when the flow rate of blow-by gas increases, the magnitude of the pressure loss generated in the oil mist separator 11 is larger than the magnitude of the pressure loss generated in the oil mist separator of the comparative example. There is no difference. That is, the pressure loss generated by the filter 21 is not so large, and the oil mist separator 11 of the first embodiment allows the blow-by gas to be sucked into the intake pipe while separating the oil mist having a large particle size even when the filter 21 is clogged. 4 can be supplied.

  In the oil mist separation device 11 according to the first embodiment, since the filter 21 is provided on the central axis of the housing 20, the pre-process blow-by gas passes through the filter 21 when the pre-process blow-by gas circulates in the centrifugal separator 23. The distance to do becomes longer. Thereby, it becomes easy to collect oil mist with a small particle diameter, and the separation efficiency of oil mist can be improved.

  Further, by providing the filter 21 on the central axis of the housing 20, the distance that blow-by gas passes through the filter 21 is increased. Thereby, even if the hole diameter of the filter 21 is made larger than that of the conventional filter, oil mist having a small particle diameter can be aggregated. Therefore, clogging of the filter 21 can be made difficult to occur.

  Moreover, the fiber which forms the filter 21 has lipophilicity. Thereby, the oil mist with a small particle diameter adhering to the fiber of the filter 21 aggregates with other oil mist collected without leaving the filter 21 due to the flow of the swirl flow. Thereby, scattering of oil mist with a small particle size can be prevented, and oil mist can be separated efficiently.

(Second Embodiment)
Next, a gas-liquid separator according to a second embodiment of the present invention will be described with reference to FIG. The second embodiment differs from the first embodiment in the shape of the filter. In addition, the same code | symbol is attached | subjected to the site | part substantially the same as 1st Embodiment, and description is abbreviate | omitted.

  In the oil mist separation device 12 as the “gas-liquid separation device” according to the second embodiment, the outer wall 611 on the radially outer side of the filter 61 approaches the inner wall 201 of the housing 20 from the introduction portion 22 side toward the discharge portion 24 side. It is formed as follows. That is, the distance d1 between the outer wall 611 on the introduction portion 22 side and the inner wall 201 of the housing 20 is larger than the distance d2 between the outer wall 611 on the discharge portion 24 side and the inner wall 201 of the housing 20. The outer wall 611 corresponds to a “filter outer wall” described in the claims. In addition, the arrow F in FIG. 5 shows the flow direction of the blow-by gas flowing through the oil mist separation device 12.

  The pre-treatment blow-by gas includes both oil mist having a large particle size and oil mist having a small particle size. Among them, the oil mist having a large particle diameter moves outward in the diameter direction of the housing 20 by centrifugal force, and falls on the bottom wall 241 along the inner wall 201 by gravity.

As the swirling flow of blow-by gas advances from the introduction part 22 side to the discharge part 24 side through the centrifugal separator 23, the oil mist having a large particle size falls on the bottom wall 241 as described above, and blow-by gas near the discharge part 24. Contains a relatively large amount of oil mist having a small particle size.
Therefore, in the oil mist separator 12, the outer diameter of the filter 61 on the discharge part 24 side is made larger than the outer diameter on the introduction part 22 side, and most of the swirling flow of blow-by gas near the discharge part 24 The filter 61 is formed so as to pass through. Thereby, the blow-by gas near the discharge part 24 can easily pass through the filter 61, and oil mist having a small particle diameter can be collected more efficiently. Therefore, in addition to the effects of the first embodiment, the oil mist separation efficiency can be improved.

(Third embodiment)
Next, a gas-liquid separator according to a third embodiment of the present invention will be described with reference to FIG. The third embodiment differs from the first embodiment in that the hole diameter of the hole of the filter is different in the filter. In addition, the same code | symbol is attached | subjected to the site | part substantially the same as 1st Embodiment, and description is abbreviate | omitted.

  In the oil mist separator 13 as the “gas-liquid separator” according to the third embodiment, the hole diameter of the hole of the filter 66 varies depending on the location in the filter 66. FIG. 6B shows an enlarged view of the radially outer filter 66 in the vicinity of the introduction portion 22 in the cross-sectional view of the oil mist separation device 13 shown in FIG. FIG. 6C shows an enlarged view of the filter 66 in the vicinity of the discharge portion 24 in the cross-sectional view of the oil mist separation device 13 shown in FIG. FIG. 6D shows an enlarged view of the radially inner filter 66 in the vicinity of the introduction portion 22 in the cross-sectional view of the oil mist separation device 13 shown in FIG. Note that an arrow F in FIG. 6 indicates the flow direction of blow-by gas flowing in the oil mist separation device 13.

  As shown in FIG. 6B, the hole diameter of the hole formed in the radially outer filter 66 in the vicinity of the introduction portion 22 is the hole diameter d3, whereas it is formed in the filter 66 in the vicinity of the discharge portion 24. As shown in FIG. 6C, the hole diameter is smaller than the hole diameter d3. Further, as shown in FIG. 6D, the hole diameter of the hole formed in the filter 66 in the vicinity of the introduction portion 22 and in the radial direction is a hole diameter d5 smaller than the hole diameter d3.

  In the swirling flow of blow-by gas formed in the centrifugal separator 23, oil mist having a large particle diameter is likely to gather on the radially outer side, and oil mist having a small particle diameter is likely to gather on the radially inner side. Therefore, in the oil mist separation device 13, the hole diameter of the hole of the filter 66 is changed in accordance with the particle size distribution of the oil mist in the swirling flow. Specifically, the radially outer filter 66 in the vicinity of the introduction portion 22 has a hole having a relatively large hole diameter, and mainly collects oil mist having a large particle diameter. In addition, the radially inner filter 66 in the vicinity of the introduction portion 22 has a hole having a relatively small hole diameter, and mainly collects oil mist having a small particle diameter. Further, since the oil mist having a large particle size is separated as the swirling flow of blow-by gas approaches the discharge unit 24 side, and a large amount of oil mist having a small particle size is included, the filter 66 in the vicinity of the discharge unit 24 is The hole has a relatively small hole diameter. Thereby, the selectivity of the oil mist which the filter 66 collects can be improved, and in addition to the effect of 1st Embodiment, the separation efficiency of oil mist can be improved.

(Fourth embodiment)
Next, a gas-liquid separator according to a fourth embodiment of the present invention will be described with reference to FIG. The fourth embodiment differs from the first embodiment in the shape of the filter. In addition, the same code | symbol is attached | subjected to the site | part substantially the same as 1st Embodiment, and description is abbreviate | omitted.

  In the oil mist separator 14 as the “gas-liquid separator” according to the fourth embodiment, the outer wall 711 on the radially outer side of the filter 71 is in contact with the inner wall 201 of the housing 20. In the outer wall 711, a concave portion 72 is spirally formed continuously from the introduction portion 22 side to the discharge portion 24 side. The recess 72 forms a flow path 75 between the inner wall 201 and the recess 72. The flow path 75 communicates the introduction part 22 and the discharge part 24 without passing through the filter 71. Note that an arrow F in FIG. 7 indicates the flow direction of blow-by gas flowing in the oil mist separation device 14.

In the oil mist separation device 14, the oil mist having a particle size increased due to aggregation in the filter 71 moves directly onto the inner wall 201 of the housing 20 without leaving the filter 71. The oil mist that has moved to the inner wall 201 falls on the bottom wall 241 along the inner wall 201. Thereby, when the oil mist whose particle size has increased is separated from the filter, it can be prevented from being split by the swirling flow.
The oil mist separation device 14 is formed with a flow path 75 that communicates the introduction portion 22 and the discharge portion 24. When the filter 71 is clogged, the pre-treatment blow-by gas passes through the flow path 75 and reaches the discharge unit 24 while dropping oil mist having a large particle size along the inner wall 201. The processed blow-by gas that has reached the discharge unit 24 is supplied to the intake pipe 4 through the second connection pipe 40. Thereby, in addition to the effect of 1st Embodiment, the oil mist separation apparatus 14 by 4th Embodiment can prevent the division | segmentation of the oil mist with which the particle size became large, and when the filter 71 is clogged However, blow-by gas can be supplied to the intake pipe 4.

(Fifth embodiment)
Next, a gas-liquid separator according to a fifth embodiment of the present invention will be described with reference to FIG. Unlike the first embodiment, the fifth embodiment differs in the arrangement direction of the fibers forming the filter. In addition, the same code | symbol is attached | subjected to the site | part substantially the same as 1st Embodiment, and description is abbreviate | omitted.

  FIG. 8A shows a cross-sectional view of the oil mist separation device 15 as the “gas-liquid separation device” according to the fifth embodiment as seen from the top side. FIG. 8B shows an enlarged view of a portion b in FIG. The plurality of fibers 83 forming the filter 81 of the oil mist separator 15 are provided so as to form an acute angle θ with respect to the flow direction of the swirling flow, as shown in FIG. In addition, the arrow F in FIG. 8 shows the flow direction of the blow-by gas flowing through the oil mist separation device 15.

  In the oil mist separation device 15, the oil mist adhering to the surface of the fiber 83 of the filter 81 moves in the direction in which the swirl flow flows. Oil mist with a small particle size moving in the same direction aggregates and increases the particle size. The oil mist having a larger particle size moves away from the filter 81 and moves outward of the housing 20 by centrifugal force. Thereby, in the filter 81 by 5th Embodiment, the oil mist on the filter 81 is made to aggregate easily using the flow of a swirl | vortex flow. Therefore, in addition to the effects of the first embodiment, the oil mist separation efficiency can be improved.

(Sixth embodiment)
Next, a gas-liquid separator according to a sixth embodiment of the present invention will be described with reference to FIG. The sixth embodiment differs from the first embodiment in the shape of the filter. In addition, the same code | symbol is attached | subjected to the site | part substantially the same as 1st Embodiment, and description is abbreviate | omitted.

  In the oil mist separator 16 as the “gas-liquid separator” according to the sixth embodiment, a plurality of protrusions 87 are formed on the outer wall on the radially outer side of the filter 86. For example, in the sixth embodiment, eight are formed at equal intervals as shown in FIG. 9B. The first outer wall 871 that forms the protrusion 87 forms an acute angle δ with respect to the direction in which the swirl flow in the centrifugal separator 23 flows. The second outer wall 872 that forms the protrusion 87 is provided at a right angle to the direction in which the swirling flow in the centrifugal separator 23 flows. Note that an arrow F in FIG. 9 indicates the flow direction of blow-by gas flowing in the oil mist separator 16.

  In the oil mist separation device 16, the oil mist having a small particle size collected by the filter 86 moves on the fiber of the filter 86 by the flow of the swirling flow and collects at the tip of the protrusion 87. In particular, the first outer wall 871 is formed at an acute angle with respect to the flow direction of the swirl flow, and easily moves in the flow direction of the swirl flow. The oil mist moving to the tip of the protrusion 87 agglomerates to increase the particle size and move away from the filter 86. In the filter 86, the protrusion 87 is formed as a place where the oil mist on the filter 86 gathers, and the oil mist having a small particle diameter is likely to aggregate. Thereby, in addition to the effect of 1st Embodiment, the separation efficiency of oil mist can be improved.

(Seventh embodiment)
Next, a gas-liquid separator according to a seventh embodiment of the present invention will be described with reference to FIG. The seventh embodiment differs from the first embodiment in the shape of the filter. In addition, the same code | symbol is attached | subjected to the site | part substantially the same as 1st Embodiment, and description is abbreviate | omitted.

  In the oil mist separator 17 as the “gas-liquid separator” according to the seventh embodiment, a plurality of filters 91 formed in a plate shape extend from the outer wall 42 of the second connection pipe 40 in the radially outward direction of the housing 20. Is provided. For example, in the seventh embodiment, eight are provided at regular intervals as shown in FIG. The filter 91 is provided so as to be parallel to the central axis of the housing 20. Some of the plurality of fibers forming the filter 91 are provided so as to form an acute angle with respect to the flow direction of the swirling flow in the centrifugal separator 23. Note that an arrow F in FIG. 10 indicates the flow direction of blow-by gas flowing in the oil mist separator 17.

In the oil mist separation device 17, oil mist having a small particle diameter is collected by a plurality of filters 91 formed in a plate shape. Thereby, compared with the oil mist separation apparatus 11 of 1st Embodiment, it can make easily.
Further, by providing a part of the fibers forming the plate-shaped filter 91 so as to form an acute angle with respect to the flow direction of the swirling flow, the oil mist having a small particle size collected by the filter 91 is swirling. Move along the flow direction. Thereby, it becomes easy to aggregate oil mist with a small particle size. Therefore, in addition to the effects of the first embodiment, the oil mist separation efficiency can be improved.

(Eighth embodiment)
Next, a gas-liquid separator according to an eighth embodiment of the present invention will be described with reference to FIG. The eighth embodiment differs from the first embodiment in the shape of the discharge port. In addition, the same code | symbol is attached | subjected to the site | part substantially the same as 1st Embodiment, and description is abbreviate | omitted.

  In the oil mist separator 18 as the “gas-liquid separator” according to the eighth embodiment, as shown in FIG. 11A, the outer wall 43 on the outlet 41 side of the second connection pipe 40 is formed in a tapered shape. Yes. That is, the inner diameter d7 of the discharge port 41 is formed to be larger than the inner diameter d6 of the second connection pipe 40 on the top side. Note that an arrow F in FIG. 11 indicates the flow direction of blow-by gas flowing in the oil mist separator 18.

  The oil mist collected and aggregated by the filter 21 moves away from the outer wall 211 of the filter 21 in the direction of the inner wall 201 of the housing 20, while a part of the oil mist not separated from the outer wall 211 of the filter 21 is shown in FIG. As indicated by the dotted arrow L5 in a), the filter 21 moves from the top side to the ground side. At this time, the oil mist moving in the filter 21 moves along the outer wall 43 in the vicinity of the discharge port 41 and falls on the bottom wall 241 of the discharge unit 24.

  In the oil mist separating device 18, the oil mist falling in the filter 21 falls in a direction away from the discharge port 41 by the outer wall 43. Thereby, oil mist falling from the ground side of the filter 21 can be prevented from being sucked into the discharge port 41. Therefore, in addition to the effects of the first embodiment, the oil mist separation efficiency can be improved.

(Ninth embodiment)
Next, the gas-liquid separator by 9th Embodiment of this invention is demonstrated based on FIG. Unlike the first embodiment, the ninth embodiment differs in the position where the gas exhaust pipe is provided and the shape of the filter. In addition, the same code | symbol is attached | subjected to the site | part substantially the same as 1st Embodiment, and description is abbreviate | omitted.

  In the oil mist separator 19 as the “gas-liquid separator” according to the ninth embodiment, the gas discharge pipe 45 is provided so as to be connected to the outer wall 202 on the radially outer side of the housing 20. A gas discharge port 46 that communicates the gas discharge pipe 45 and the housing 20 is formed on the ground side of the outer wall 202.

The filter 96 is formed in a plate shape. As shown in FIG. 12B , outer walls 963 and 964 as “filter contact walls” on the radially outer side of the filter 96 are in contact with the inner wall 201 of the housing 20. Yes. The radially outer outer walls 961 and 962 that are not in contact with the inner wall 201 of the filter 96 are formed in a concave shape toward the central axis of the housing 20. The outer walls 963 and 964 correspond to “a part of the filter outer wall” recited in the claims. The outer walls 961 and 962 correspond to “non-contact walls” recited in the claims. A part of the inner wall 201 in contact with the outer walls 963 and 964 of the inner wall 201 of the housing 20 corresponds to a “swivel means abutting wall” described in the claims.

  As shown in FIG. 12B, the blow-by gas in the introduction port 31 swirls in the introduction unit 22 and the centrifuge unit 23. At this time, the entire amount of blow-by gas passes through the filter 96. The oil mist contained in the blow-by gas is collected by the filter 96 and aggregated to become an oil mist having a large particle size. The oil mist having a large particle diameter moves in the direction of the inner wall 201 of the housing 20 by centrifugal force, is collected on the bottom wall 241 of the discharge portion 24, and is discharged to the outside of the housing 20. Note that an arrow F in FIG. 12 indicates the flow direction of blow-by gas flowing in the oil mist separator 19.

  In the oil mist separation device 19, since the entire amount of blow-by gas passes through the filter 96, the oil mist separation efficiency can be improved. Further, when the filter 96 is clogged with foreign matter or the like, the blow-by gas is a path 26 formed between the outer wall 961 and the inner wall 201 of the housing 20 and a path 27 formed between the outer wall 962 and the inner wall 201. Pass through. At this time, the blow-by gas passing through the paths 26 and 27 forms a swirl flow in each of the paths 26 and 27, and oil mist having a large particle diameter can be separated in each of the paths 26 and 27. . Thereby, in addition to the effects of the first embodiment, the oil mist separation device 19 can supply blow-by gas to the intake pipe 4 while separating the oil mist even when the filter 96 is clogged.

(Other embodiments)
(A) In the above-described embodiment, the filter is formed from a plurality of fibers. However, the material forming the filter is not limited to this. Any porous material may be used.

  (A) In the above-described embodiment, the fiber forming the filter is assumed to have lipophilicity. However, the material forming the filter is not limited to this. It may be non-lipophilic.

  (C) In the sixth embodiment described above, a plurality of protrusions protruding outward in the radial direction are formed on the outer wall of the filter. However, the number of protrusions formed is not limited to this. The number of protrusions formed may be one or more.

  (D) In the above-described sixth embodiment, the shape of the protrusion formed on the filter is formed so that the first outer wall has an acute angle with respect to the direction in which the swirling flow flows, and the second outer wall is substantially in the direction in which the swirling flow flows. It was supposed to form at a right angle. However, the shape of the protrusion is not limited to this.

  As mentioned above, this invention is not limited to such embodiment, It can implement with a various form in the range which does not deviate from the summary.

11, 12, 13, 14, 15, 16, 17, 18, 19 ... oil mist separator (gas-liquid separator),
20 ・ ・ ・ Housing (swivel means),
201 ... inner wall,
21, 66, 71, 76, 81, 86, 91, 96... Filter 22... Introduction part (one end part),
24 ... discharge part (the other end),
25, 26, 27 ... flow paths,
30 ... 1st connection pipe (introduction pipe),
40: Second connecting pipe (discharge pipe).

Claims (13)

A gas-liquid separation device for separating a gas-liquid mixture into a liquid and a gas,
The gas-liquid mixture introduced into one end (22) is spirally swirled along the inner wall (201) to form a swirling flow toward the other end (24). Swivel means (20) for centrifuging liquid and gas;
An introduction pipe (30) connected to the one end and introducing a gas-liquid mixture into the swivel means from a tangential direction of the swivel means;
A discharge pipe (40) connected to the other end and for discharging the gas in the swivel means to the outside of the swivel means;
It is provided for at least the radially inner swirl flow and is formed from a porous member that collects the liquid contained in the gas-liquid mixture that forms the most radially inner swirl flow and aggregates the collected liquid. Filters (21, 66, 71, 76, 81, 86, 91, 96),
With
The swirl means has a flow path (25, 26, 27) through which the gas-liquid mixture introduced into the one end can flow to the other end without forming contact with the filter while forming a swirl flow. ) Is formed.
  2. The gas-liquid separation device according to claim 1, wherein the flow path is formed by a filter outer wall (211, 611) on the radially outer side of the filter and an inner wall of the swivel unit.   3. The gas-liquid separator according to claim 1, wherein an inner diameter of the swivel unit decreases from the one end side toward the other end side. 4. The one end side of the filter outer wall (611) that forms the flow path on the one end side and the inner wall (201) of the swiveling means facing the one end side of the filter outer wall The distance (d1) is the distance between the other end side of the filter outer wall that forms the flow path on the other end side and the inner wall of the swiveling means facing the other end side of the filter outer wall. The gas-liquid separator according to any one of claims 1 to 3, wherein the gas-liquid separator is longer than the distance (d2) .
  5. The gas-liquid according to claim 1, wherein a hole diameter of the hole formed in the filter decreases from the one end side toward the other end side. 6. Separation device.   The gas-liquid separation device according to any one of claims 1 to 5, wherein a hole diameter of the hole formed in the filter decreases from a radially outer side to a radially inner side of the swivel unit. . The said filter is formed from the fiber extended in the direction which makes an acute angle with respect to the flow direction of the vicinity of the said filter of the swirl | vortex flow formed in the said turning means, The one of Claim 1 to 6 characterized by the above-mentioned. The gas-liquid separator described in 1.
The gas-liquid separation device according to any one of claims 1 to 7, wherein a projection (87) is formed on an outer wall of the filter so as to protrude in a radially outward direction of the swivel means .
  The gas-liquid separation device according to any one of claims 1 to 8, wherein the filter is formed in a plate shape and is provided in parallel to a swirling central axis of a swirling flow. The discharge pipe is located on the swivel center axis of the swirling flow, and the opening (41) on the other end side of the discharge pipe is accommodated in the other end,
The filter is provided so as to contact the outer tube wall (42) of the discharge tube,
The gas-liquid separation device according to any one of claims 1 to 9, wherein an outer diameter of the discharge pipe increases toward the opening side. The discharge pipe is located on a swivel center axis of a swirling flow, and the opening on the other end side of the discharge pipe is accommodated in the other end;
The filter is provided so as to be in contact with an outer tube wall of the discharge pipe, and a filter outer wall in a radially outer side of the filter is in contact with an inner wall of the swivel means,
The gas-liquid separator according to claim 1, wherein the flow path is formed by a recess (75) formed in the outer wall of the filter and an inner wall of the swivel means.   The gas-liquid separator according to claim 11, wherein the recess is formed in a spiral shape. The filter contact walls (963, 964) that are part of the filter outer wall radially outside the filter are in contact with the turning means contact wall that is a part of the inner wall (201) of the turning means ,
The flow path, that is formed by an inner wall of said swirl means excluding non abutment wall (961, 962) and said pivot hand stepped abutment wall of the radially outer side of the filter excluding the filter abutment wall The gas-liquid separator according to claim 1, wherein

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