JP2014028359A - Separator - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a separator by which excellent collection efficiency is achieved even when particles having a relatively small diameter (approximately 1 μm) are included as a foreign matter to be collected.SOLUTION: An oil separator 1 is equipped with: a cyclone body 2 in which a cyclone chamber S is formed; a gas introduction pipe 3 which introduces blow-by gas (fluid) into the cyclone chamber; and a gas lead-out pipe 4 which introduces blow-by gas from which oil (foreign matter) was separated to the outside of the cyclone chamber, in which a length L1 of a lateral side in a rectangular cross section of a gas flow path P2 ranging from the gas introduction pipe to the cyclone chamber is set equal to a length of a gap G1 between an outer peripheral surface 16a of the gas lead-out pipe and an inner peripheral surface 11h of a cylindrical portion, and reduction of gas flow rate near the outer peripheral surface of the gas lead-out pipe is suppressible.

Description

  The present invention relates to a separator for separating foreign substances in a fluid.

  In automobile engines, etc., the blow-by gas that leaks into the crankcase from the gap between the piston and cylinder contains a large amount of HC (hydrocarbon), so it is returned to the intake system and recombusted with the mixture. The method is widespread. Since blow-by gas contains oil (that is, foreign matter) obtained by atomizing engine oil or the like, the gas after removing this oil is sent to the intake system. As means for separating oil mist in blow-by gas, various types of oil separators (labyrinth type, inertial collision type, cyclone type, etc.) are known.

  As this type of cyclone type oil separator, for example, it is provided with a substantially cylindrical container in which a cyclone chamber is formed, and blow-by gas is introduced along the inner peripheral surface of the peripheral wall from a gas inlet provided in the upper part of the peripheral wall. It is known that oil is separated by an oil centrifugal separation action in blow-by gas and stored below the cyclone chamber, while gas from which oil is separated is led out from a gas outlet provided in the upper portion of the cyclone chamber (Patent Document 1). reference). In this conventional oil separator, the separated oil is recovered in the L-shaped recovery passage connected to the lower half of the substantially conical cyclone chamber, and the cross-sectional area of the gas outlet is the gas inlet. By making it smaller than the cross-sectional area, the swirl flow in the gas outlet pipe is strengthened to improve the oil separation efficiency.

JP-A-11-264312

  By the way, for example, in an automobile engine or the like, it is desirable that oil with a relatively small diameter (around 1 μm) can be efficiently collected in an oil separator from the viewpoint of exhaust gas regulations and environmental loads. However, in the conventional technique described in Patent Document 1, although the overall oil collection efficiency may be improved, a large effect is not necessarily expected for the small diameter oil collection efficiency as described above. There was a problem that I could not.

  The present invention has been devised in view of such problems of the prior art, and achieves good collection efficiency even when particles having a relatively small diameter (about 1 μm) are included as foreign matter to be collected. It is a main object to provide a separator that can be used.

  The separator according to the first aspect of the present invention is a separator (1) for separating foreign matter in a fluid, and has a cylindrical portion (11) and a hollow conical portion (12) connected to the lower end thereof, and is provided inside. A separation container (2) in which a cyclone chamber (S) is formed, and a fluid introduction pipe (3) connected to the cylindrical portion and for introducing the fluid into the cyclone chamber in a tangential direction of the inner peripheral surface of the cylindrical portion. ) And a fluid outlet pipe (4) for guiding the fluid after separation of the foreign matter to the outside of the separation container, the fluid reaching the cyclone chamber from the fluid introduction pipe The flow path (P2) includes a pair of vertical sides (15a, 15b) extending in a direction parallel to the axis of the cylindrical portion and a pair of horizontal sides (15c) extending in a direction perpendicular to the axis of the cylindrical portion. 15d) with a rectangular cross section defined by The fluid outlet tube has a cylindrical outer peripheral surface that is coaxial with the cylindrical portion, and the length (L1) of the lateral side is determined by the outer peripheral surface (16a) of the fluid outlet tube and the inner peripheral surface of the cylindrical portion. (11h) and the length of the gap (G1) is the same.

  In the separator according to the first aspect, the horizontal side of the fluid flow path of the fluid introduction pipe (the width of the fluid introduction port into the cyclone chamber) and the gap between the outer peripheral surface of the fluid outlet pipe and the inner peripheral surface of the cylindrical portion are the same. Due to the length, it is possible to suppress a decrease in the flow velocity of the fluid in the vicinity of the outer peripheral surface of the fluid outlet pipe in the cyclone chamber, and particles having a relatively small diameter (around 1 μm) are included as foreign matters to be collected. But good collection efficiency can be achieved.

  According to a second aspect of the present invention, with respect to the first aspect, the position of the upper edge (15a) of the fluid flow channel overlaps with the position of the upper edge (Sa) of the cyclone chamber in the gap. To do.

  The separator according to the second aspect can prevent a decrease in the flow velocity in the vicinity of the fluid inlet of the fluid inlet pipe in the cyclone chamber, and can achieve better collection efficiency even for relatively small diameter particles. it can.

  According to a third aspect of the present invention, with respect to the first or second aspect, the fluid outlet tube has an extending portion (26) extending into the hollow conical portion, and an outer peripheral surface of the extending portion. (26a) is inclined so as to be reduced in diameter toward the hollow cone portion, and the inclination angle of the outer peripheral surface is the same as the inclination angle of the inner peripheral surface of the hollow cone portion. .

  The separator according to the third side surface smoothed the flow of fluid toward the hollow cone portion around the fluid outlet port located at the end of the extension portion of the fluid outlet tube, and lost the swirl force near the fluid outlet port. It is possible to suppress relatively small diameter particles from flowing into the fluid outlet pipe.

  According to a fourth aspect of the present invention, with respect to the first or second aspect, the fluid outlet tube has an extending portion extending into the hollow conical portion, and an outer peripheral surface of the extending portion (26). (26a) is characterized in that it is inclined so that its diameter is increased toward the hollow cone side.

  The separator according to the fourth aspect of the present invention is configured so that the flow of the fluid in the vicinity of the fluid outlet of the fluid outlet pipe is directed to the side away from the fluid outlet, and the particles having relatively small diameter that have lost the swirling force in the vicinity of the fluid outlet. Can be prevented from flowing into the fluid outlet pipe.

  In the fifth aspect of the present invention, with respect to any one of the first to fourth aspects, the length (L3) of the cyclone chamber in the cylindrical portion is at least twice the length (L2) of the vertical side. It is characterized by being.

  The separator in the fifth aspect can appropriately secure a swirling region of fluid in the cyclone chamber, and can achieve better collection efficiency even for particles having a relatively small diameter.

  As described above, according to the present invention, even when particles having a relatively small diameter (around 1 μm) are included as the foreign matter to be collected, an excellent effect is achieved that it is possible to achieve good collection efficiency.

1 is a perspective view of an oil separator according to a first embodiment. Front view of the oil separator according to the first embodiment The top view of the oil separator concerning a 1st embodiment IV-IV sectional view in FIG. Cross-sectional view taken along line V-V in FIG. Sectional view taken along line VI-VI in FIG. Explanatory drawing which shows an example of the locus | trajectory of the oil particle in the oil separator which concerns on 1st Embodiment. Sectional drawing which shows the modification of the gas outlet tube shown in FIG. The perspective view of the oil separator which concerns on 2nd Embodiment Front view of an oil separator according to a second embodiment Vertical section of the cyclone unit shown in FIG. XII-XII sectional view in FIG. XIII-XIII cross-sectional view in FIG. Cross section along line XIV-XIV in Fig. 9 The top view of the oil separator concerning a 3rd embodiment XVI-XVI line sectional view in FIG.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. In the description, the term indicating the direction follows the direction indicated by the arrow in FIG. 1 in the first embodiment and the direction indicated by the arrow in FIG. 9 in the second embodiment. However, the practical arrangement of the separator according to the present invention (oil separator in the embodiment) is not limited to those directions.

(First embodiment)
1, 2 and 3 are a perspective view, a front view and a plan view, respectively, of the oil separator according to the first embodiment of the present invention. FIG. 4 is a sectional view taken along line IV-IV in FIG. 5 and 6 are a cross-sectional view taken along the line V-V and a cross-sectional view taken along the line VI-VI in FIG. 3, respectively.

  The oil separator 1 is configured as a so-called tangential inflow type cyclone, and is used as a means for separating oil (mist) in blow-by gas in a blow-by gas reduction device provided in an automobile engine (not shown). As shown in FIGS. 1 and 2, the oil separator 1 is made of a synthetic resin material and has a cyclone body (separation container) 2 in which a cyclone chamber S (see FIG. 5) is formed, and the side of the cyclone body 2. The gas inlet pipe 3 for introducing blow-by gas into the cyclone chamber S and the upper part of the cyclone main body 2 are connected to the cyclone chamber S, and the gas after oil separation (hereinafter referred to as separation gas) is guided to the outside of the cyclone main body 2. A gas outlet pipe 4 and a cylindrical oil collecting box 5 connected to the lower part of the cyclone main body 2 and collecting separated oil are provided.

  The cyclone body 2 has an upper cylindrical portion 11 and a hollow conical portion 12 that is continuous with the lower end of the cylindrical portion 11. As shown in FIG. 3, a connecting portion 11 a for connecting to the gas introduction pipe 3 protrudes from the left front side portion of the cylindrical portion 11. A circular flange 13 for connecting the oil collecting box 5 is formed at the lower end of the hollow conical portion 12. As shown in FIG. 5, the cylindrical portion 11 and the hollow conical portion 12 are arranged coaxially with the central axis C of the oil separator 1, and the tapered shape of the hollow conical portion 12 connected to the hole 11 h of the cylindrical portion 11 and the lower end thereof. The side peripheral surface of the cyclone chamber S is defined by the holes 12h.

  As shown in FIG. 1, the gas introduction pipe 3 includes an introduction pipe body 6 made of a pipe having a cylindrical outer peripheral surface, and a rectangular flange 7 provided at the rear end of the introduction pipe body 6. Yes. The front end of the introduction pipe body 6 is connected to a blow-by gas supply pipe (not shown). The flange 7 is bolted to the connection portion 11 a of the cylindrical portion 11. In addition, a sealing member (not shown) interposed between the rear surface of the flange 7 is accommodated in an annular groove 20 (see FIG. 4) provided on the front surface of the connecting portion 11a.

  A flow path P1 is formed in the gas introduction pipe 3, and an opening at the front end (the same applies to the cross section of the flow path P1) has a rectangular shape as shown in FIG. The rectangle includes a pair of left and right vertical sides 15a and 15b extending in the vertical direction (direction parallel to the central axis C) and a pair of vertical sides 15c extending in the left and right direction (direction perpendicular to the central axis C). , 15d.

  As shown in FIGS. 4 and 6, a communication path P <b> 2 that connects the hole 11 h and the outside is formed in the left front portion of the cylindrical portion 11. The communication path P2 has the same cross-sectional shape as the flow path P1 of the gas introduction pipe 3, and substantially forms a part of the gas introduction pipe 3 by connecting to the rear end of the flow path P1. The flow path P1 and the communication path P2 extend in the front-rear direction, and the end of the communication path P2 is connected to the hole 11h of the cylindrical portion 11 in the tangential direction. Thereby, blow-by gas is introduced along the inner peripheral surface of the cylindrical portion 11.

  As shown in FIG. 5, the gas lead-out pipe 4 has a lead-out pipe main body 16 formed of a circular pipe and a circular flange 17 provided at an intermediate portion in the vertical direction of the lead-out pipe main body 16. The flange 17 is bolted to the upper surface of the cylindrical portion 11. On the lower side of the flange 17, a boss portion 17 a that is fitted into the hole 11 h of the cylindrical portion 11 is formed. Thus, the upper surface (upper edge) Sa of the cyclone chamber S is defined by the lower surface of the boss portion 17a. The lower part of the outlet tube main body 16 located below the boss portion 17a is in a state of protruding into the hole 11h of the cylindrical portion 11. A circular groove 21 provided on the upper surface of the cylindrical portion 11 accommodates a seal member (not shown) interposed between the lower surface of the flange 17.

  The oil collection box 5 is disposed on the lower side of the hollow conical portion 12, and is formed on a cylindrical collection box body 18 in which a collection chamber R is formed, and an upper end of the collection box body 18. A circular flange 19. The flange 19 is bolted to the flange 13 provided at the lower end of the hollow cone portion 12. Thereby, the cyclone chamber S communicates with the collection chamber R of the oil collection box 5 through the opening at the lower end of the hollow conical portion 12. The oil collection box 5 is attached to an appropriate position of the engine (not shown) via a plurality of attachment pieces 18a formed so as to protrude in the circumferential direction at the lower end of the collection box main body 18. In addition, a sealing member (not shown) interposed between the flange 19 is accommodated in an annular groove 22 provided on the lower surface of the flange 13. A check valve (not shown) is provided at the lower part of the oil collection box 5, and the oil collected in the collection chamber R is appropriately discharged to the oil pan side.

  FIG. 7 is an explanatory diagram showing an example of the locus of oil particles in the oil separator according to the first embodiment. Oil particles M having a relatively small diameter (0.6 μm in this case) in the blow-by gas are introduced into the cyclone chamber S from the gas introduction port 25 (see FIG. 6) of the gas introduction pipe 3 through the flow path P1 and the communication path P2. Thereafter, the lead-out pipe body 16 descends while rotating between the outer peripheral surface 16a of the outlet pipe main body 16 and the hole (inner peripheral surface) 11h of the cylindrical portion 11.

  Here, as shown in FIG. 4, the lateral width L1 of the flow path P1 and the communication path P2 (that is, the length of the lateral sides 15c and 15d in FIG. 2) is equal to the outer peripheral surface 16a of the outlet tube main body 16 and the cylindrical portion. 11 is set to have the same length as the gap G1 with the inner peripheral surface (hole 11h). As a result, a decrease in gas flow velocity in the vicinity of the outer peripheral surface of the gas outlet pipe 4 is suppressed, and an increase in pressure loss is also suppressed, so that the oil particles M to be collected have a relatively small diameter (here, 0.5%). ˜5 μm) has the advantage that good collection efficiency is achieved. Here, the cross-sections of the flow path P1 and the communication path P2 are the same in the entire longitudinal direction, but at least in the inflow portion to the cyclone chamber S, the relationship between the lateral width L1 and the gap G1 is satisfied. Good.

  Further, as shown in FIG. 6, the position of the upper edge P2a of the flow path P1 and the communication path P2 (that is, the upper side 15c in FIG. 2) is the position of the upper surface (upper edge) Sa of the cyclone chamber S. Is consistent with As a result, the flow rate of the blow-by gas (oil particles M) in the vicinity of the gas introduction port 25 of the gas introduction pipe 3 is prevented from being lowered, and a good collection efficiency is achieved even for oil particles M having a relatively small diameter. is there.

  Further, as shown in FIG. 5, the vertical length L3 of the hole 11h of the cylindrical portion 11 is equal to the vertical width L2 of the gas inlet 25 (that is, the length of the vertical sides 15a and 15b in FIG. 2). It is set to twice as long. Thereby, although it is a compact structure, the swirl | swivel area | region of the gas in the cylindrical part 11 is ensured appropriately, and there exists an advantage that better collection efficiency is achieved also about the oil particle M with a comparatively small diameter. The vertical length L3 of the hole 11h can be set to be larger than twice the vertical width L2 depending on the installation space of the oil separator 1.

  Referring to FIG. 7 again, thereafter, the oil particles M pass through between the outer peripheral surface 16a of the outlet tube main body 16 and the inner peripheral surface (hole 11h) of the cylindrical portion 11 while turning and reach the hollow conical portion 12. To do. Here, as shown in FIG. 5, the lower portion of the gas outlet pipe 4 extends beyond the lower end of the cylindrical portion 11 and into the hollow conical portion 12, and the outer peripheral surface 26 a of the extended portion 26 faces downward. It inclines so that it may reduce in diameter as it goes. The inclination angle of the outer peripheral surface 26a with respect to the central axis C is the same as the inclination angle of the inner peripheral surface (hole 12h) of the hollow cone portion 12 with respect to the central axis C. As a result, the flow of blow-by gas toward the hollow conical portion 12 in the vicinity of the gas outlet 27 located at the end of the extended portion 26 of the gas outlet pipe 4 is smoothed, and the turning force is lost in the vicinity of the gas outlet 27. There is an advantage that oil particles having a relatively small diameter can be prevented from flowing into the gas outlet pipe 4.

  Further, the internal space of the hollow conical portion 12 (the lower portion of the cyclone chamber S) has a truncated cone shape with a reduced diameter on the lower side, and an inner diameter D1 at the lower end thereof is between the outer peripheral surface 16a of the outlet tube main body 16 and the cylindrical portion 11. It is set larger than the gap G1 with the inner peripheral surface (hole 11h). Moreover, the inlet diameter D2 of the collection chamber R communicating with the cyclone chamber S is wider than the inner diameter D1 of the hollow cone portion. As a result, the oil particles M can be guided to the lower side of the collection chamber R of the oil collection box 5 while swirling, and good collection efficiency can be obtained even when the oil particles M having a relatively small diameter are contained in the blow-by gas. There is an advantage that can be achieved.

  The separated gas is led to the outside (engine intake system) through the gas outlet pipe 4. Part of the oil mist (such as oil particles larger than the oil particles M) adheres to the side circumferential surfaces of the cyclone chamber S and the collection chamber R due to centrifugal force during swirling, and then travels along the side circumferential surfaces. Then, it is moved downward by gravity and finally collected in the collection chamber R. Further, part of the oil mist that cannot be centrifuged (such as oil particles that are smaller than the oil particles M) loses the swirling force in the cyclone chamber S and flows into the gas outlet 27 of the gas outlet pipe 4. Through to the outside.

  FIG. 8 is a cross-sectional view showing a modification of the gas outlet pipe shown in FIG. In the gas lead-out pipe 4 of the modified example, the lower part of the lead-out pipe main body 16 located below the boss part 17a is thinned, and the outer peripheral surface 16a and the cylindrical part of the lead-out pipe main body 16 are smaller than the gap G1 in FIG. The gap G2 with the inner peripheral surface (hole 11h) of 11 is enlarged. Moreover, the outer peripheral surface 26a of the extension part 26 inclines so that it may be diameter-expanded as it goes below. A gap G3 between the lower end of the gas outlet pipe 4 and the inner peripheral surface (hole 12h) of the hollow conical portion 12 is set to the same size as the gap G1 in FIG. With such a configuration, the gas flow in the vicinity of the gas outlet 27 of the gas outlet pipe 4 is directed toward the side away from the gas outlet 27, and the relatively small diameter has lost the turning force in the vicinity of the gas outlet 27. The oil particles can be prevented from flowing into the gas outlet pipe 4.

(Second Embodiment)
9 and 10 are a perspective view and a front view, respectively, of an oil separator according to a second embodiment of the present invention, FIG. 11 is a longitudinal sectional view of the cyclone unit shown in FIG. 9, and FIGS. FIG. 14 is a sectional view taken along lines XII-XII and XIII-XIII in FIG. 10, respectively, and FIG. 14 is a sectional view taken along line XIV-XIV of the cyclone unit shown in FIG. Each of the cyclones 101 shown in FIGS. 9 to 14 relating to the second embodiment corresponds to the oil separator 1 in the first embodiment described above, and the components that perform the same functions as the oil separator 1 and their respective parts are described. The same code | symbol as 1st Embodiment is attached | subjected. Regarding the components of the cyclone 101, matters not particularly mentioned below are the same as those of the oil separator 1.

  The oil separator 100 is attached to a cam carrier housing of an automobile engine (not shown), and is used as means for separating oil (mist) in blow-by gas. As shown in FIGS. 9 and 10, the oil separator 100 includes a cyclone unit 102 formed of a synthetic resin material and including a plurality of cyclones 101, and a gas passage unit 103 that guides blow-by gas from the engine to the cyclone unit 102. I have.

  In the cyclone unit 102, as shown in FIG. 11 or FIG. 12, the central axes C of the cylindrical portions 11 in the three cyclones 101 having the same structure are arranged in a line in the left-right direction. The lower ends of the hollow conical portions 12 in the three cyclones 101 are respectively connected to one oil collecting box 5 arranged below them. By using such a plurality of cyclones 101, the diameter of each cylindrical portion 11 can be reduced so that oil particles having a relatively small diameter can be collected well, and the oil collecting box 5 can be shared to be compact. An apparatus can be realized. As in the case of the first embodiment, the inlet sizes D2a and D2b (see also FIG. 13) of the collection chamber R are wider than the inner diameter D1 of the lower end of the hollow cone portion 12. A check valve 45 is provided at the bottom of the oil collection box 5, and the oil collected in the collection chamber R is appropriately discharged to the oil pan side through the drain pipe 46.

  A gas outlet chamber 51 into which a separation gas from each cyclone 101 is introduced is provided on the upper part of the three cyclones 101. The gas lead-out chamber 51 has a shape in which an upper portion of a substantially cylindrical main body is closed, and a discharge pipe 52 that discharges separated gas toward the intake system of the engine protrudes rearward from the side peripheral surface thereof. As shown in FIG. 13, the proximal end side of the discharge pipe 52 is bent upward to form an L shape, and the proximal end of the discharge pipe 52 is formed by a check valve 53 provided at the upper part of the gas outlet chamber 51. The flow of gas into the opening is controlled.

  In the gas outlet tube 4 of each cyclone 101, as shown in FIGS. 11 and 13, in the first embodiment, instead of the boss portion 17a (see FIG. 5) positioned at the upper end of the cylindrical portion 11, The upper portion is expanded in the radial direction to form an enlarged diameter portion 55. Like the boss portion 17a, the enlarged diameter portion 55 is fitted into the upper portion of the hole 11h of the cylindrical portion 11, and the upper surface (upper edge) of the cyclone chamber S is defined by the lower surface of the enlarged diameter portion 55. Yes. The upper opening of the enlarged diameter portion 55 opens into the gas outlet chamber 51. That is, the separation gas flow path P <b> 3 is expanded by the expanded diameter portion 55 and then further expanded in the gas outlet chamber 51. As a result, the diameter of the upper part of the separation gas outlet flow path is expanded stepwise, the flow velocity of the separation gas is reduced, and the derivation of oil particles having a relatively small diameter is effectively suppressed (that is, again from the gas outlet pipe 4). Back into the cyclone 101).

  In the gas passage unit 103, the blow-by gas introduced from the lower side of the inlet portion 61 (see FIG. 9) is divided into two upper and lower stages by a partition wall 62 extending in the left-right direction as shown in FIG. It is sent to the cyclone unit 102 side through paths P4 and P5. As shown by the arrow A, the blow-by gas is first sent to the right in the lower flow path P5 and then sent to the upper flow path P4 through the communication hole 62a formed at the right end of the partition wall 62. Thereafter, the blowby gas is sent toward the left cyclone unit 102 through the upper flow path P4. As shown in FIG. 12, the left end portion of the upper flow path P4 is widened forward and communicates with the internal space of the cyclone unit 102 in which the inlets of the three cyclones 101 to the gas introduction pipe 3 are arranged. The introduction pipe body 6 (that is, corresponding to the flow path P1 and the communication path P2 in the first embodiment) extends in the front-rear direction so as to be parallel to each other. Accordingly, even when a plurality of cyclones 101 are used, the passage (upper flow path P4) through which blow-by gas flows into the cyclone 101 can be simplified by arranging the gas introduction pipes 3 in the same direction.

  The flow of oil particles in the cyclone 101 is the same as that of the oil separator 1 of the first embodiment described above. Moreover, about the structure of each part in the cyclone 101, the structure of each part in the oil separator 1 of the above-mentioned 1st Embodiment is applicable as needed.

(Third embodiment)
15 is a plan view of an oil separator according to a third embodiment of the present invention, and FIG. 16 is a cross-sectional view taken along line XVI-XVI in FIG. In addition, in the oil separator according to the third embodiment shown in both drawings, the same reference numerals as those in the second embodiment are given to components that perform the same functions as those of the oil separator 100 in the second embodiment. Items that are not particularly mentioned are the same as those in the second embodiment.

  As shown in FIG. 16, the cyclone unit 102 is provided with one cyclone 101 in the third embodiment. Here, the lower part 12a of the hollow cone part 12 in the cyclone 101 protrudes into the collection chamber R of one oil collection box 5 arranged below the hollow cone part 12. In the first and second embodiments described above, as shown in FIGS. 5 and 11, the flange 13 formed at the lower end of the hollow conical portion 12 and the flange 19 formed at the upper end of the oil collecting box 5. The upper end of the oil collecting box 5 (collecting chamber R) is connected to the lower end of the hollow conical portion 12 by fastening, but the lower portion 12a of the hollow conical portion 12 as in the third embodiment is not limited thereto. The structure inserted in the collection chamber R of the oil collection box 5 can be adopted. Even in that case, the diameter of the collection chamber R at the lower end position of the protruding hollow cone portion 12 (corresponding to the inlet diameter of the collection chamber R) is preferably wider than the diameter of the lower end of the hollow cone portion 12. .

  A gas outlet chamber 51 is provided above the oil collection box 5 on the side of the cyclone 101, and an upper flow passage outlet 16 b in the outlet pipe body 16 of the cyclone 101 communicates with the gas outlet chamber 51. ing. The gas lead-out chamber 51 has a substantially cubic shape, and a discharge pipe 52 that discharges the separated gas toward the intake system of the engine protrudes from the upper surface thereof. Further, a connecting pipe 47 communicating with the drain pipe 46 is connected to the bottom of the gas outlet chamber 51 so that the oil collected in the gas outlet chamber 51 can be discharged.

  In the gas passage unit 103, blow-by gas introduced from an inlet (not shown) is sent to the cyclone unit 102 side through the flow path P6 as shown by an arrow B in FIGS. Introduced into chamber S. Thereafter, as indicated by an arrow C, the separation gas is discharged from the discharge pipe 52 through the gas outlet chamber 51 from the flow path outlet 16b of the outlet pipe main body 16. 15 and 16 show a state where the lid of the gas passage unit 103 is removed (a state where the upper part of the flow path P6 is opened).

  Although the present invention has been described based on specific embodiments, these embodiments are merely examples, and the present invention is not limited to these embodiments. For example, the cyclone used in the separator according to the present invention can be used to separate not only oil in blow-by gas but also foreign matters (for example, dust) in other fluids (for example, air). The fluid to which the separator according to the present invention is applied includes at least one of gas and liquid, and the foreign matter in the fluid includes at least one of liquid and solid. However, the fluid and the foreign matter need to have different specific gravities so that they can be separated by a cyclone.

  In addition, as a specific application of the separator according to the present invention, in the field of housing equipment, separation of oil and dust in exhaust in a kitchen exhaust fan, etc., separation of raw garbage in drainage in a kitchen drainage port, For example, separation of trash in rainwater when using rainwater. In addition, in the field of home appliances, filter aids in air cleaners (separation of dust in the air), separation of underwater garbage in washing machines, separation of water in the exhaust of drum washing machines, steam in dishwashers Examples include the elimination of water (separation of water in the exhaust), the steamless rice cooker, and the steamless oven. Further, in the automotive field, there are reductions in gasoline vapor (separation of gasoline in the emitted gas) and the like.

  Note that all of the constituent elements of the separator according to the present invention shown in the above embodiment are not necessarily essential, and can be appropriately selected without departing from the scope of the present invention.

1,100 Oil separator 2 Cyclone body (separation container)
3 Gas introduction pipe (fluid introduction pipe)
4 Gas outlet pipe (fluid outlet pipe)
5 Oil collection box (foreign material collection box)
11 cylindrical part 11h hole (inner peripheral surface)
12 hollow conical portions 15a, 15b vertical sides 15c, 15d horizontal sides 16 outlet tube main body 16a outer peripheral surface 26 extending portion 26a outer peripheral surface 51 gas outlet chamber (fluid outlet chamber)
55 Expanded portion 102 Cyclone unit C Central axis G1 Gap L1 Horizontal side length L2 Vertical side length L3 Cyclone chamber lengths P1, P2, P3 Gas flow path R Collection chamber S Cyclone chamber Sa Upper edge

Claims (5)

A separator for separating foreign matter in a fluid,
A separation container having a cylindrical portion and a hollow conical portion connected to the lower end thereof, in which a cyclone chamber is formed;
A fluid introduction pipe connected to the cylindrical portion and introducing the fluid into the cyclone chamber in a tangential direction of an inner peripheral surface of the cylindrical portion;
One end protrudes into the separation container, and includes a fluid outlet pipe that guides the fluid after separating the foreign matter to the outside of the separation container,
The fluid flow path from the fluid introduction pipe to the cyclone chamber has a pair of vertical sides extending in a direction parallel to the axis of the cylindrical portion and a pair of horizontal sides extending in a direction perpendicular to the axis of the cylindrical portion. Having a rectangular cross section defined by sides;
The fluid outlet pipe has a cylindrical outer peripheral surface that is coaxial with the cylindrical portion,
The separator is characterized in that the length of the horizontal side is the same as the length of the gap between the outer peripheral surface of the fluid outlet pipe and the inner peripheral surface of the cylindrical portion.   The separator according to claim 1, wherein the position of the upper edge of the fluid flow path overlaps with the position of the upper edge of the cyclone chamber in the gap. The fluid outlet pipe has an extending part extending into the hollow conical part,
The outer peripheral surface of the extending part is inclined so as to be reduced in diameter toward the hollow cone part side,
The separator according to claim 1 or 2, wherein the inclination angle of the outer peripheral surface is the same as the inclination angle of the inner peripheral surface of the hollow cone portion. The fluid outlet pipe has an extending part extending into the hollow conical part,
3. The separator according to claim 1, wherein an outer peripheral surface of the extension portion is inclined so as to increase in diameter toward the hollow cone portion side. 4.   The length of the cyclone chamber in the said cylindrical part is 2 times or more of the length of the said vertical side, The separator in any one of Claims 1-4 characterized by the above-mentioned.

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