WO2016046944A1

WO2016046944A1 - Separation disk for oil separator, rotor for oil separator, and oil separator

Info

Publication number: WO2016046944A1
Application number: PCT/JP2014/075478
Authority: WO
Inventors: 耕作石田; 佳孝渡辺
Original assignee: 東京濾器株式会社
Priority date: 2014-09-25
Filing date: 2014-09-25
Publication date: 2016-03-31

Abstract

The present invention addresses the problem of enhancing the efficiency of separation of mist-like oil from gas to be treated which contains the oil. The present invention provides a separation disk 51 used for an oil separator that is configured so that a rotor provided so as to be rotatable together with a spindle is rotated while gas to be treated and oil for separation are introduced in the inner peripheral space of the rotor, thereby separating mist-like oil from the gas to be treated, the separation disk 51 constituting a separation disk group 34 of the rotor. The separation disk 51 has: an outer peripheral portion 52 constituted by a plurality of sloped flat surfaces 53 extending in a tilted direction between the radial direction and the thrust direction; and an inner peripheral portion 54 located closer to the center of rotation than the outer peripheral portion 52. The separation disk 51 for an oil separator is characterized in that: the outer peripheral portion 52 is provided with a protrusion (point-like protrusion 57) that is in contact with another separation disk 51 adjacent, in a stack direction, to the separation disk 51 having the protrusion (point-like protrusion 57) thereon, thereby forming a separation space between the separation disks 51; and a ridge 56 extending in the tilted direction is provided at the boundary between a pair of adjacent sloped flat surfaces 53.

Description

Oil separator separator disk, oil separator rotor, and oil separator

The present invention relates to an oil separator that separates a mist-like oil contained in a gas to be treated from a gas, a rotor used in the oil separator, and a separation disk that constitutes a part of the rotor.

An oil separator that separates mist oil contained in a gas to be treated from gas is known. For example, the oil separator described in Patent Document 1 separates mist-like oil from gas by centrifugal force using a rotor provided between the gas inlet and outlet. This rotor is formed by laminating a plurality of separation disks. This separation disk is constituted by a truncated cone-shaped plate member whose outer peripheral side portion is bent obliquely upward so that the upper side has a large diameter. An opening penetrating in the plate thickness direction is formed in the inner peripheral side portion of the separation disk. For this reason, a space is formed in the inner peripheral side portion of the rotor.

In this oil separator, crankcase gas (blow-by bus), which is the gas to be treated, is introduced into the space on the inner peripheral side of the rotor. The crankcase gas introduced into this space is allowed to flow to the outer periphery of the rotor through the gap between the separation disks rotating at high speed, and the mist oil is aggregated and separated from the crankcase gas in this gap. Yes.

That is, when the mist-like oil contained in the crankcase gas reaches the boundary layer formed along the surface of the separation disk, it moves by centrifugal force and collides with and adheres to the surface of the separation disk. The attached mist-like oil moves to the outer peripheral side of the rotor by centrifugal force. At that time, the adhering mist-like oil is combined with other mist-like oil adhering to the surface of the separation disk in the same manner, and the volume is gradually increased.

Special table 2003-513792 gazette

In the oil separator described above, oil mist contained in the crankcase gas is taken into the boundary layer formed on the surface of the separation disk as the separation disk rotates at high speed. The oil mist taken into the boundary layer is coalesced with other oil mist taken in the same manner on the surface of the separation disk. Since the amount of oil mist contained in the crankcase gas is extremely small, in order to increase the separation efficiency of the mist-like oil, it is necessary to increase the diameter of the separation disk and take in a large amount of oil mist. As the diameter of the separation disk increases, there arises a problem that the oil separator increases in size.

The present invention has been made in view of such circumstances, and an object of the present invention is to increase the separation efficiency when separating the mist oil contained in the gas to be treated from the gas.

In order to achieve the above-mentioned object, the present invention introduces a gas to be treated including mist-like oil and separation oil into an inner circumferential space of a rotor rotatably provided with a spindle, and rotates the rotor. A separation disk that is used in an oil separator that separates the mist-like oil from the gas to be treated and is stacked in the axial direction of the spindle to constitute a separation disk group included in the rotor, and in a radial direction And an outer peripheral side portion constituted by a plurality of inclined planes extending in an inclination direction between the thrust direction, and an inner peripheral side portion closer to the rotation center than the outer peripheral side portion, Protrusions that are in contact with the other separation disks adjacent in the stacking direction to form a separation space between the separation disks are provided, and a pair of adjacent the separation disks The boundary of the oblique plane, characterized in that the ridge portion extending in the inclined direction.

Further, the present invention is used in an oil separator that separates the mist-like oil from the gas to be treated containing mist-like oil, and rotates together with the spindle in a state where the gas to be treated and the separation oil are introduced into the inner space. A rotor that separates the mist-like oil from the gas to be treated, the separation disk group including a plurality of separation disks stacked in the axial direction of the spindle, and the separation disk group A pair of holders sandwiched and held in the stacking direction of the separation disks, the separation disk including an outer peripheral side portion configured by a plurality of inclined planes extending in an inclination direction between a radial direction and a thrust direction, and the outer peripheral side An inner peripheral portion closer to the center of rotation than the portion, and the outer peripheral portion includes the other separation disc adjacent to the stacking direction. A protrusion that forms a separation space in contact with the separation disk, and a ridge that extends in the inclination direction is provided at a boundary between a pair of adjacent inclined planes. .

The present invention also provides an oil separator that separates the mist-like oil from the gas to be treated containing mist-like oil, and rotates together with the spindle in a state where the gas to be treated and the separation oil are introduced into the inner circumferential space. And a rotor that separates the mist-like oil from the gas to be processed, and the rotor includes a separation disk group including a plurality of separation disks stacked in an axial direction of the spindle, and the separation A pair of holders that hold the disk group in the stacking direction of the separation disk, and the separation disk is stacked in the axial direction of the spindle to constitute the separation disk group of the rotor. And an outer peripheral side portion constituted by a plurality of inclined planes extending in an inclination direction between the radial direction and the thrust direction. An inner peripheral side portion closer to the rotation center than the outer peripheral side portion, and the outer peripheral side portion is in contact with the other separation disk adjacent in the stacking direction and has a separation space between the separation disk and the separation disk. The protrusion to form is provided, The ridge part extended in the said inclination direction is provided in the boundary of a pair of adjacent said inclination plane, It is characterized by the above-mentioned.

According to these inventions, the separation oil forms an oil film on the disk surface by rotating the rotor at a high speed while the gas to be treated and the separation oil are introduced into the inner circumferential space of the rotor. . And the oil mist contained in process object gas is taken in into the boundary layer formed in the surface of an oil film. Here, since the oil film is the same oil as the oil mist, the affinity is higher than that of the separation disk. For this reason, the boundary layer formed on the surface of the oil film can take in the oil mist more efficiently than the boundary layer formed on the surface of the separation disk. Further, the oil film that has taken in the oil mist moves toward the ridge portion, is collected at the ridge portion, and moves in the outer circumferential direction. This oil film is discharged from the end of the ridge. Since the discharged oil is in the form of droplets, it is possible to prevent a problem that the taken-in oil mist is re-misted. As a result, the efficiency of separating mist oil can be increased.

In the above-described invention, when at least a part of the protrusion is provided on the ridge portion, the protrusion provided on the ridge portion of a certain separation disk is another separation disk adjacent in the stacking direction. Since the position in the circumferential direction is determined by abutting the ridge portion, unnecessary rattling in the separation disks can be suppressed, and the position in the circumferential direction of each separation disk constituting the separation disk group can be determined.

In the above-described invention, when the protrusion is constituted by a plurality of point-like protrusions, the contact area with the point-like protrusions at the ridge portion can be reduced, so that the collected oil can flow smoothly.

In the above-described invention, when the point-like protrusions are provided on the inclined plane in a staggered manner, the separation space is secured while ensuring the area of the oil film formed on the surface of the separation disk. It can be secured.

In the above-described invention, when the protrusion is constituted by a plurality of ribs and the ribs are provided on the inclined plane along the inclined direction, they are formed on the surface of the separation disk. Since the oil film can be collected by the ribs and can be discharged in the form of drops, it is possible to prevent a problem that the oil mist taken in becomes mist again.

In the above-described invention, when the outer edge of the inclined plane connecting the outer peripheral side ends of the pair of adjacent ridges protrudes in a mountain shape toward the inclined direction, the length of the inclined direction in the inclined plane is increased. Since the length can be increased, the formation area of the oil film can be expanded correspondingly, and the efficiency of separating the mist-like oil can be increased.

In the above-mentioned invention, when the outer edge of the inclined plane connecting the outer peripheral side ends of a pair of adjacent ridges is projected in an arc shape toward the inclined direction, Since the length can be increased, the formation area of the oil film can be expanded correspondingly, and the separation efficiency of the mist oil can be increased.

According to the present invention, when separating the mist oil contained in the gas to be treated from the gas, the separation efficiency can be increased.

It is the schematic which shows a closed type crankcase ventilation system. It is a front view of an oil separator. It is a top view of an oil separator. It is the longitudinal cross-sectional view which looked at the whole oil separator from the right side. It is the longitudinal cross-sectional view which looked at the lower part of the oil separator from the right side. It is the longitudinal cross-sectional view which looked at the rotor part of the oil separator from the front side. It is a partial expanded sectional view explaining the inner peripheral side space formed in the inner peripheral side of a rotor, and the separation space formed between separation discs. It is a figure which illustrates taking in of oil mist typically. It is a longitudinal cross-sectional view which expands and shows the vicinity of a PCV valve | bulb. It is a perspective view of a rotor. It is a top view of a rotor. It is a front view of a rotor. It is a perspective view of the rotor of the state which removed the upper holder. FIG. 6B is a cross-sectional view taken along line AA shown in FIG. 6B. FIG. 6B is a cross-sectional view taken along the line BB shown in FIG. 6B and showing only the cross-sectional shape. It is CC sectional drawing shown to FIG. 6B. It is DD sectional drawing shown to FIG. 6C. It is a perspective view of the separation disc of a 1st embodiment. It is a top view of the separation disc of a 1st embodiment. It is a side view of the separation disk of 1st Embodiment. It is a top view of the separation disk of 1st Embodiment, and is a figure which shows the position of a cross section. It is EE sectional drawing shown to FIG. 10A. It is the G section enlarged view shown to FIG. 10B. FIG. 10B is a sectional view taken along line FF shown in FIG. 10A. It is the H section enlarged view shown to FIG. 10B. It is a figure explaining arrangement | positioning of the dotted | punctate protrusion provided in the ridge part, and the lamination | stacking state in a some separation disc. It is a perspective view explaining arrangement | positioning of the dotted | punctate protrusion provided in the ridge part. It is a graph which compares the separation efficiency in the case where the separation disk of 1st Embodiment is used, and the case where the conventional separation disk is used. It is a perspective view of the separation disk of 2nd Embodiment. It is a top view of the separation disk of 2nd Embodiment. It is a side view of the separation disk of 2nd Embodiment. It is a top view of the separation disk of 2nd Embodiment, and is a figure which shows the position of a cross section. It is II sectional drawing shown to FIG. 14A. It is the K section enlarged view shown to FIG. 14B. It is JJ sectional drawing shown to FIG. 14A. It is the L section enlarged view shown to FIG. 14D. It is a graph which compares the separation efficiency in the case where the separation disk of 2nd Embodiment is used, and the case where the conventional separation disk is used. It is a perspective view explaining the separation disk of 3rd Embodiment. It is a perspective view explaining the separation disk of 4th Embodiment. It is a perspective view explaining the separation disk of 5th Embodiment. It is a top view explaining the separation disk of 5th Embodiment. It is a perspective view explaining the separation disk of 6th Embodiment. It is a top view explaining the separation disk of 6th Embodiment. It is a perspective view explaining the separation disk of 7th Embodiment. It is a top view explaining the separation disk of 7th Embodiment. It is a perspective view explaining the separation disk of 8th Embodiment. It is a top view explaining the separation disk of 8th Embodiment.

Hereinafter, embodiments of the present invention will be described with reference to the drawings. Here, a closed crankcase ventilation system 1 (hereinafter referred to as a ventilation system 1) will be described as an example.

As shown in FIG. 1, the ventilation system 1 includes an oil separator 2 and a breather pipe 3. The oil separator 2 processes blow-by gas (corresponding to a processing target gas containing mist-like oil) discharged from the engine 4 to separate the mist-like oil. In the present embodiment, the oil separator 2 is attached to the side surface of the engine 4. The breather pipe 3 defines a flow path for reducing the treated blow-by gas discharged from the oil separator 2 to the intake-side flow path 6 of the engine 4.

In this ventilation system 1, blow-by gas is led out from the engine 4 through the gas lead-out pipe 5 and introduced into the oil separator 2. The mist oil contained in the blowby gas is taken into the oil supplied from the engine 4 inside the oil separator 2 and returned to the engine 4 together with this oil. On the other hand, the blowby gas after the treatment from which the mist-like oil has been removed is discharged from the oil separator 2 and then returned to the intake side flow path 6 through the breather pipe 3. Specifically, it is returned to a portion where the air filter 7 and the turbocharger 8 are connected in the intake side flow path 6. The reduced blow-by gas is mixed with fresh air from the air filter 7 and compressed by the turbocharger 8. Thereafter, the blow-by gas is cooled by the charge cooler 9 and supplied to the engine 4.

Next, the oil separator 2 will be described. As shown in FIG. 2, the oil separator 2 includes a housing 11 having a lower case 12 and an upper case 13. Various components such as a rotor unit and a PCV valve are accommodated in an internal space (accommodating chamber) of the housing 11 (described later).

The lower case 12 is a portion that divides the lower portion of the housing 11, and is constituted by a box-shaped member with a bottom having an open upper surface. A circular fitting portion 14 is provided at the upper end portion of the lower case 12 and is fitted to the lower end portion 15 of the upper case 13. Thereby, the lower case 12 and the upper case 13 are connected in an airtight state. As shown in FIG. 4, a communication tube portion 16 is provided on the back surface of the lower case 12 so as to face rearward. The communication cylinder portion 16 is a cylindrical member that serves as an outlet for oil used in the oil separator 2. For this reason, the internal space of the communication cylinder part 16 is connected to the internal space of the engine 4. As shown in FIGS. 2 and 3, a flange 17 coupled to the side surface of the engine 4 is provided at the distal end portion of the communication tube portion 16. A suction pipe 18 projects from the upper left side of the lower case 12 toward the left side.

The gas outlet pipe 5 is connected to the suction pipe 18. Blow-by gas from the engine 4 is introduced into the oil separator 2 from the gas outlet pipe 5 through the suction pipe 18 by the intake pressure of the engine 4 or the pressure on the crankcase side. At this time, the intake pressure of the engine 4 and the pressure on the crankcase side are appropriately adjusted by the PCV valve. The suction pipe 18 functions as a gas introduction part.

As shown in FIGS. 2 and 4, the joint portion 20 of the oil guide pipe 19 faces the bottom surface of the lower case 12. The joint portion 20 is connected to one end of an oil supply pipe 21 shown in FIG. The oil supply pipe 21 is for supplying oil sent from the engine 4 to the oil guide pipe 19. As will be described later, the oil supplied to the oil guide pipe 19 is ejected from a nozzle 38 (see FIG. 5A) of the rotor unit 27 shown in FIG. 4 and used as power for rotating the rotor unit 27. For convenience, in the following description, the oil sprayed from the nozzle 38 is also referred to as power oil. This power oil is part of the lubricating oil used in the engine 4 and therefore has a temperature of about 80 to 110 ° C.

2, the upper case 13 is a member attached to the lower case 12 from above. The upper case 13 includes a cylindrical main body cover 22 having a ceiling portion and a disk-shaped upper surface cover 23. The main body cover 22 is attached to the lower case 12 in an airtight state. The upper surface cover 23 is attached to the upper end portion of the main body cover 22 in an airtight state. As shown in FIG. 3, a cylindrical gas discharge portion 24 protrudes upward from the center portion of the top cover 23. The gas discharge part 24 is a part for discharging blowby gas after processing. The above-described breather pipe 3 is connected to the gas discharge portion 24 via an outlet pipe 25 bent in an L shape.

Next, the internal structure of the oil separator 2 will be described with reference to FIG. In FIG. 4, the left side corresponds to the front side of the oil separator 2, and the right side corresponds to the rear side of the oil separator 2. As shown in FIG. 4, a PCV valve 26, a rotor unit 27, and a partition member 28 are disposed inside the housing 11. The PCV valve 26 is disposed in the upper part of the housing 11. Specifically, the PCV valve 26 is attached between the main body cover 22 and the upper surface cover 23 so as to be covered with the upper surface cover 23. The rotor unit 27 is disposed at an intermediate portion in the vertical direction of the housing 11. Specifically, the rotor unit 27 is disposed in an internal space defined by the main body cover 22 in a rotatable state. The partition member 28 is disposed immediately below the rotor 31 constituting the rotor unit 27. The partition member 28 is positioned in a state in which the flange portion 44 is sandwiched between the lower end portion 15 of the upper case 13 and the fitting portion 14 of the lower case 12.

Next, the internal structure of the lower case 12 will be described with reference to FIG. 5A. 5A, the left side corresponds to the front side of the oil separator 2, and the right side corresponds to the rear side of the oil separator 2. As shown in FIG. 5A, a communication cylinder part 16 is integrally provided at the rear part of the lower case 12, and the internal space (other separation space SP <b> 3) of the lower case 12 and the internal space of the communication cylinder part 16 Is communicated. The bottom surface of the lower case 12 is inclined downward toward the communication cylinder portion 16. A cylindrical oil guide pipe 19 is provided upward from the bottom surface of the lower case 12. A joint portion 20 is provided at the lower end of the oil guide pipe 19, and the upper end of the oil guide pipe 19 is fixed by a fixed frame 29. The fixed frame 29 is a frame body attached to the inner peripheral side of the fitting portion 14, and is provided in a cross shape along the inner peripheral surface of the fitting portion 14 and on the inner side of the frame portion. And a cross. And the upper end of the oil guide pipe 19 is inserted in the through-hole 29a opened in the cross | intersection part in a cross part.

Although not illustrated in FIG. 5A, the suction pipe 18 is provided on the left side surface of the lower case 12 at a height immediately below the fitting portion 14. The internal space of the lower case 12 and the internal space of the suction pipe 18 are in communication. For this reason, blow-by gas is sucked into the internal space of the lower case 12 from the engine 4. The power oil sprayed from the nozzle 38 is sprayed onto the inner wall surface of the tapered portion of the partition member 28. This power oil flows down along the inner wall surface of the tapered portion and the inner wall surface of the lower case 12. Since the temperature of the power oil becomes as high as 80 to 110 ° C., the oil separator 2 is heated from the lower case 12 side. Thereby, even if it is used in a cold district, it is possible to suppress the occurrence of malfunction of the oil separator 2 due to freezing or the like.

Next, the rotor unit 27 will be described with reference to FIG. 5B. The rotor unit 27 is a mechanism for separating mist-like oil contained in blow-by gas, and includes a rotor 31, a spindle 32, and a spindle shaft 33.

The rotor 31 is a part that separates oil mist from blow-by gas, and includes a separation disk group 34, an upper holder 35, and a lower holder 36. The separation disk group 34 includes a plurality of separation disks 51 stacked in the axial direction of the spindle 32. As shown in FIG. 7, the separation disk 51 has an outer peripheral side portion 52 constituted by a plurality of inclined planes 53 and an inner peripheral side portion 54 closer to the rotation center than the outer peripheral side portion 52. The separation disk 51 will be described in detail later.

As shown in FIG. 5B, the upper holder 35 is a member that holds a plurality of stacked separation disks 51 from the upper side, and the lower holder 36 is a member that similarly holds the lower side from the lower side. The upper holder 35 and the lower holder 36 correspond to a holder pair that holds the separation disk group 34 in the stacking direction of the separation disks 51. In FIG. 5B and FIG. 5C, the separation disks 51 are drawn with an interval therebetween, but the actual interval is extremely narrow, for example, 1 mm or less.

The rotor 31 has a cylindrical appearance, and the inner peripheral side serving as the center of rotation is hollow and penetrates in the vertical direction. A spindle 32 is inserted into the inner circumferential space SP1, and the spindle 32 and the rotor 31 are coupled to each other. In the present embodiment, the spindle 32 and the rotor 31 are coupled by joining the eight plate-like members 35 b constituting the disk holding portion 35 a to the peripheral surface of the spindle 32. The disk holding portion 35a is inserted into the mounting opening 55 (see FIG. 7) of each separation disk 51. As a result, the rotor 31 rotates about the axis of the spindle 32 together with the spindle 32.

A nozzle 38 protrudes from the peripheral surface of the spindle 32 below the rotor 31. The nozzle 38 is a portion that injects oil supplied through the spindle shaft 33, and generates a driving force for rotating the spindle 32 and the rotor 31. In the present embodiment, the nozzle 38 has a cylindrical nozzle body 38a whose base end is joined to the spindle 32 and whose tip is closed, and an injection port 38b provided at the tip of the nozzle body 38a. Yes. The nozzle body 38 a is attached at an angle of 45 degrees obliquely downward with respect to the axial direction of the spindle 32. Three nozzle bodies 38a are provided at intervals of 120 degrees in the circumferential direction. The injection port 38b is provided on the side surface of the tip portion of the nozzle body 38a. Specifically, the injection port 38b is provided in a direction orthogonal to the axial direction of the nozzle body 38a and in a direction in which oil is injected in a substantially horizontal direction.

The spindle shaft 33 is a cylindrical member serving as a bearing for the spindle 32, and supports the spindle 32 in a rotatable state. A first oil supply path 39 for supplying oil is formed inside the spindle shaft 33. The lower end of the spindle shaft 33 is joined to the upper end of the oil guide pipe 19. As described above, the oil supply pipe 21 is connected to the joint portion 20 of the oil guide pipe 19. For this reason, the oil supplied through the oil supply pipe 21 flows into the first oil supply path 39 after passing through the oil guide pipe 19.

A gap is formed between the spindle 32 and the spindle shaft 33 with the top and bottom sealed. This gap serves as the second oil supply path 40. The second oil supply path 40 is in communication with the first oil supply path 39 and the nozzle 38 and is filled with oil supplied from the first oil supply path 39. A part of the oil supplied to the second oil supply passage 40 flows into the nozzle body 38a and is then injected from the injection port 38b as power oil.

Here, the lower end of the second oil supply path 40 is sealed by a cylindrical lower seal member 41. Similarly, the upper end of the second oil supply path 40 is sealed by a cylindrical upper seal member 42. As the oil pressure increases, a small amount of oil leaks from the gaps between the lower seal member 41 and the upper seal member 42 and the spindle 32. In the present embodiment, when the rotor 31 is rotated at a speed at which a centrifugal force of about 2000 G is generated, oil of about 50 to 200 mL / min flows from the gap between the upper end of the spindle 32 and the upper seal member 42 to the rotor 31. It is introduced into the inner space SP1.

For convenience, in the following description, oil introduced from the upper end of the second oil supply path 40 into the inner circumferential space SP1 of the rotor 31 is referred to as separation oil. The upper end of the second oil supply path 40, specifically, the gap between the upper end of the spindle 32 and the upper seal member 42, introduces an oil that introduces a part of the oil supplied to the second oil supply path 40 as separation oil. It corresponds to the part. This separating oil is used for separating mist-like oil, but is a high temperature of 80 to 110 ° C. because it is a part of engine oil. For this reason, when the separating oil is introduced into the inner circumferential space SP1, the rotor 31 and the vicinity thereof are heated from the inside, and even when used in a cold region, the occurrence of malfunction of the oil separator 2 due to freezing or the like is suppressed. be able to.

Next, the partition member 28 will be described. The partition member 28 is disposed between the rotor 31 and the nozzle 38, partitions the internal space of the housing 11 into an internal space of the lower case 12 and an internal space of the upper case 13, and blow-by gas in the lower case 12. Is a member that forms a flow path that guides the air to the inner circumferential space SP1 of the rotor 31.

The partition member 28 has an outer peripheral portion 43, a flange portion 44, and a tapered portion 45. The outer peripheral portion 43 is a cylindrical portion and is formed so as to surround the lower end portion of the rotor 31 from the outside. In the middle of the outer peripheral portion 43 in the height direction, the flange portion 44 projects laterally. As described above, the flange portion 44 is a portion for positioning the partition member 28, and is sandwiched between the lower end portion 15 of the upper case 13 and the fitting portion 14 of the lower case 12. The tapered portion 45 is provided on the inner peripheral side of the outer peripheral portion 43 and has a tapered shape that is gradually reduced in diameter from the lower end of the outer peripheral portion 43 upward. And the upper end opening 45a of the taper part 45 is arrange | positioned with respect to the center part of the surface direction in the lower end of the rotor 31 from the lower side.

Further, a lower end portion of the spindle 32, a lower end portion of the spindle shaft 33, a nozzle 38, and a fixed frame 29 are arranged on the inner peripheral side of the tapered portion 45 and below the upper end opening. As shown in FIG. 5C, part of the oil supplied from the engine 4 is injected from the nozzle 38 as power oil, as indicated by the arrow F1. At this time, another part of the oil supplied from the engine 4 passes through the second oil supply path 40 as separation oil, and then, as shown by the arrow F2, the upper end of the second oil supply path 40 It is introduced from the (oil introduction part) into the space on the inner peripheral side of the rotor 31.

The power oil sprayed from the nozzle 38 collides with the inner wall surface of the taper portion 45 and flows down the inner wall surface as indicated by the arrow F3. Further, the motive power oil flows down through the internal space of the lower case 12. In the course of this flow, the power oil comes into contact with the blow-by gas, and the oil mist contained in the blow-by gas is primarily separated. The blow-by gas from which the oil mist is primarily separated rises on the inner peripheral side of the tapered portion 45 and is guided to the inner peripheral space SP1 of the rotor 31.

The blow-by gas from which the oil mist has been primarily separated flows into the inner circumferential space SP1 of the rotor 31 from the lower side, as indicated by the arrow F11. In this inner circumferential space SP1, since the rotor 31 rotates at a high speed, the introduced separation oil is applied to the surface of the plate-like member 35b constituting the disc holding portion 35a as indicated by the arrow F4. It spreads along and flows into the separation space SP2 (the gap between the separation disks 51) from the edge of the mounting opening 55. The blow-by gas also flows into the separation space SP2 from the edge of the mounting opening 55 as indicated by the arrow F12.

As shown in FIG. 5D, the separation oil that has flowed into the separation space SP2 has the separation disk 51 (rotor 31) rotated at a high speed in the direction indicated by the symbol R around the rotation axis AX. An oil film OF is formed by spreading evenly over the entire surface of 51. The blow-by gas flows while contacting the oil film OF formed on the surface of the separation disk 51, as indicated by the arrow F13. Thereby, the boundary layer BL is formed on the surface of the oil film OF. The blow-by gas flows on the surface side of the boundary layer BL toward the outer peripheral edge of the separation disk 51. At that time, as shown by the arrow F5, the oil mist MS contained in the blow-by gas is applied to the boundary layer BL. It is captured. The oil mist MS taken into the boundary layer BL is moved by the centrifugal force indicated by the symbol CF, and united with the oil film OF.

The oil film OF that has taken in the oil mist, that is, the separation oil, is discharged from the outer peripheral edge of the separation disk 51 in the form of drops. The discharged oil droplets collide with the inner peripheral surface of the main body cover 22. Here, the members denoted by reference numeral 37 in FIG. 5C are connecting arms for connecting the upper holder 35 and the lower holder 36, and four members are provided at intervals of 90 degrees as shown in FIG. 6A. For this reason, there is a space between the connecting arms 37, and the oil droplets discharged from the outer peripheral edge of the separation disk 51 collide with the inner peripheral surface of the main body cover 22.

The oil droplets colliding with the inner peripheral surface of the main body cover 22 flow down while being combined with other oil droplets, as indicated by the arrow F6 in FIG. 5C. Then, it flows into the internal space of the lower case 12 through a drain hole (not shown) formed in the bottom of the partition member 28. The separation oil that has flowed into the inner space of the lower case 12 is combined with the motive power oil and returned to the engine 4 through the communication cylinder portion 16.

Here, the oil mist is derived from the lubricating oil in the same manner as the oil film OF (separation oil). For this reason, the oil mist has a higher affinity (wetting property) for the oil film OF than the separation disk 51. Thereby, the boundary layer BL formed on the surface of the oil film OF can take in the oil mist more efficiently than the boundary layer BL formed on the surface of the separation disk 51. As a result, even if the separation disk 51 is configured to have a small diameter, high separation efficiency can be obtained, and the oil separator 2 can be downsized.

Also, with this oil separator 2, water contained in the lubricating oil can be volatilized along with separation of the oil mist. That is, since the temperature of the separation oil is as high as 80 to 110 ° C., with respect to the oil film OF formed on the surface of the separation disk 51, the temperature of the oil film OF is also a sufficient temperature range for volatilizing water. In addition, since the oil film OF is also densely formed by the separation discs 51 stacked in a large number, the temperature of the oil film OF can be maintained. Furthermore, since the oil film OF is formed on the entire surface of the separation disk 51, a sufficient area is ensured in order to volatilize water efficiently. For these reasons, water contained in the lubricating oil can be volatilized efficiently. Thereby, the malfunction which an emulsion produces in lubricating oil can be suppressed.

Next, the PCV valve 26 will be described. As shown in FIG. 5E, the PCV valve 26 includes a diaphragm 46, an upper spring 47, and a lower spring 48.

The diaphragm 46 is a disc-shaped valve body, and is manufactured by molding rubber and resin. The upper spring 47 and the lower spring 48 are elastic members for supporting the diaphragm 46 so as to be movable in the vertical direction. That is, the upper spring 47 is disposed above the diaphragm 46, and the lower spring 48 is disposed below the diaphragm 46. The diaphragm 46 is sandwiched between the upper spring 47 and the lower spring 48 and supported in a movable state.

The diaphragm 46 moves up and down according to the intake side pressure of the engine 44 and the internal pressure of the crankcase, and adjusts the flow of blow-by gas. That is, the diaphragm 46 moves to the blow-by gas discharge side (upward) when the intake pressure (negative pressure) of the engine 4 is excessively large, and to the opposite side (downward) when the crankcase side pressure is high. Moving. Thereby, the flow volume of blow-by gas is adjusted appropriately. Further, the pressure of the engine 4 (crankcase) is also adjusted appropriately.

The blow-by gas after the treatment from which the oil mist has been removed is discharged from the outer peripheral edge of the separation disk 51 to the outside, and then rises inside the housing 11. The blow-by gas after processing passes through the PCV valve 26, the gas discharge part 24, and the outlet pipe 25 and is discharged from the oil separator 2. The blow-by gas discharged from the oil separator 2 is returned to the intake side flow path 6 through the breather pipe 3. In addition, since the inside of the oil separator 2 is heated by the separation oil or the power oil, the water volatilized from the oil film OF moves together with the blow-by gas without condensation, and is reduced to the intake side flow path 6. .

Next, the rotor 31 will be described in detail. As shown in FIGS. 6A to 6C, the rotor 31 includes a separation disk group 34, an upper holder 35, and a lower holder 36. The upper holder 35 is a member that holds the separation disk group 34 from above, and the lower holder 36 is also a member that holds the separation disk group 34 from below.

As shown in FIG. 7, the separation disk 51 (separation disk 51 </ b> A of the first embodiment) constituting the separation disk group 34 rotates more than the outer peripheral side portion 52 constituted by the inclined plane 53 and the outer peripheral side portion 52. And an inner peripheral portion 54 on the center side. The outer peripheral portion 52 has a shape in which trapezoidal plate members are connected in an umbrella shape. Accordingly, the surface of the plate member is an inclined plane 53. In addition, a polygonal mounting opening 55 surrounded by a trapezoidal upper bottom portion is formed in the inner peripheral side portion 54. In this embodiment, since eight plate members are connected in the outer peripheral side portion 52, a regular octagonal mounting opening 55 is formed in the inner peripheral side portion 54. A large number of separation disks 51 are stacked so that the positions of the apexes of the mounting opening 55 in the circumferential direction are aligned. Accordingly, the inner circumferential space SP1 is partitioned by each mounting opening 55. Details of the separation disk 51 will be described later.

As shown in FIGS. 8A to 8C, a disk holding portion 35a is provided at the rotation center portion of the upper holder 35 so as to face downward. The disk holding portion 35a is composed of eight plate-like members 35b arranged at equal angular intervals from the rotation center of the rotor 31 in the radial direction. 8D, when the disk holding portion 35a is inserted into the inner circumferential space SP1 of the separation disk group 34, the side edges of the plate-like members 35b are in contact with the apexes of the mounting openings 55. Thereby, the shakiness of the circumferential direction in each separation disk 51 is controlled.

As shown in FIGS. 6A and 6C, a plurality of connecting arms 37 for connecting to the upper holder 35 are provided on the outer peripheral edge of the lower holder 36. In the present embodiment, four connection arms 37 are provided at intervals of 90 degrees in the circumferential direction. A lateral arm 37 ′ curved along the circumferential direction is provided in the middle of the connecting arm 37 in the height direction. This horizontal arm 37 'connects a pair of adjacent connecting arms 37 to increase rigidity. Then, by joining the upper end of the connecting arm 37 to the upper holder 35, the separation disk group 34, the upper holder 35, and the lower holder 36 are integrated, and the rotor 31 is configured.

Next, the separation disk 51 will be described. As shown in FIG. 9A, the separation disk 51A of the first embodiment is produced by joining eight trapezoidal plate portions in an umbrella shape. As a result, as shown in FIG. 9B, the separation disk 51A has a regular octagonal umbrella shape in plan view. The separation disk 51A of the present embodiment has a diameter of 80 to 120 mm and a thickness of 0.3 to 0.4 mm, and is manufactured by resin molding.

Further, as shown in FIG. 9C, when the rotational radius direction of the separation disk 51A is defined as the radial direction ra and the axial direction of the spindle 32 is defined as the thrust direction th, the surface of each plate portion has the radial direction ra and the thrust direction. An inclined plane 53 extending in the inclination direction in between the directions th is formed. For this reason, the outer peripheral side portion 52 of the separation disk 51 </ b> A has eight inclined planes 53. As shown in FIG. 9B, the inner peripheral side portion 54 of the separation disk 51A has a regular octagonal mounting opening 55 surrounded by the upper bottom portion of each plate portion.

As shown in FIG. 9A, in the outer peripheral side portion 52 of the separation disk 51A, the boundary between adjacent inclined planes 53 is bent in a mountain shape, and a ridge 56 extending in the inclined direction in is formed. Eight ridges 56 are formed for one separation disk 51A, and connect each vertex of the outer periphery of the disk from each vertex of the mounting opening 55 as shown in FIG. 9B.

A plurality of dot-like protrusions 57 are formed on the surface of the inclined plane 53. The point-like protrusions 57 are in contact with the other separation disks 51A adjacent in the stacking direction to form a gap of 1 mm or less between the separation disks 51A, and correspond to the protrusions according to the present invention. With the dot protrusions 57, a separation space SP2 is formed between the separation disks 51A. As shown in the sectional views of FIGS. 10B and 10D and partially enlarged sectional views of FIGS. 10C and 10E, the dot-like projections 57 in this embodiment are half the thickness of the disk with the upper surface of the plate portion facing upward. It is provided by being protruded to a certain extent and being recessed to about half of the disc thickness with the lower surface of the plate portion facing upward. Or, conversely, the upper surface of the plate part is recessed downward by about half of the disk thickness, and the lower surface of the plate part is protruded downward by about half of the disk thickness. And as shown to FIG. 9A, these dotted | punctate protrusions 57 are provided in the inclined plane 53 in the state arrange | positioned in zigzag form.

A part of the dot-like protrusion 57 is provided along the ridge 56. As shown in FIG. 11A, in the present embodiment, four point-like protrusions 57 are provided for one ridge portion 56. As a result, as shown in FIG. 11B, the dot-like projections 57 provided on the ridge portion 56 of a certain separation disk 51A contact the ridge portion 56 of another separation disk 51A adjacent to the upper side in the stacking direction from below. In contact with each other, the circumferential position of each separation disk 51A is determined. Thereby, unnecessary rattling in the separation disk 51A can be suppressed, and the circumferential position of each separation disk 51A constituting the separation disk group 34 can be determined.

FIG. 12 is a graph showing the test results of the separation efficiency of mist oil contained in blow biole. In this test, the case where the separation disk 51A of the first embodiment (regular octagonal truncated cone type) described above is used is compared with the case where a general truncated cone type separation disk is used.

In this test, engine oil was misted so that the amount became 5 g (83 mg / min) per hour, and 20 L / min pre-dilution blow-by gas was generated. And it diluted by adding fresh air with respect to this blowby gas before dilution, and obtained the simulated blowby gas of 40L / min, 100L / min, 170L / min, 200L / min, 250L / min. These simulated blow-by gases were introduced from the suction pipe 18, the treated blow-by gas discharged from the outlet pipe 25 was collected, and the concentration of the contained oil mist was measured. And separation efficiency was computed from the density | concentration of the oil mist contained in blowby gas after a process, and the approximate line was drawn.

As shown in FIG. 12, it was found that by using the separation disk 51A of the first embodiment, a higher separation efficiency than that of the truncated cone type separation disk can be obtained. In particular, as the flow rate of blow-by gas increased to 100 L / min, 200 L / min, and 300 L / min, the separation disk 51A of the first embodiment achieved higher separation efficiency than the truncated cone type separation disk.

This is considered to be an effect of the ridge 56. As described with reference to FIG. 5D, both the separation disc 51A of the first embodiment and the truncated cone type separation disc take in the oil mist into the separation oil (oil film OF) by the oil mist entering the boundary layer BL. They are common in that they are taken in by centrifugal force, and there is no difference between them.

Here, in the separation disc 51A of the first embodiment, the oil film OF that has taken in the oil mist moves toward the ridge 56 by the centrifugal force and is collected. The collected oil flows toward the outer circumference along the downward slope of the ridge 56 and is discharged from the end of the ridge 56. Since the discharged oil is in the form of large droplets, it is possible to prevent a problem that the oil mist taken in becomes mist again.

On the other hand, in the truncated cone type separation disk, oil droplets are evenly discharged from the entire circumference of the outer peripheral edge of the separation disk. Since the size of the oil droplet to be discharged is small, the oil droplet is easily misted again when it collides with the inner wall surface of the main body cover 22. Then, it is considered that the oil that has been misted again moves together with the simulated blowby gas as the flow rate of the simulated blowby gas increases.

Thus, by forming the separation disk group 34 using the separation disk 51A of the first embodiment, it is possible to increase the separation efficiency of the mist oil. In the separation disk 51A of the first embodiment, since a part of the point-like protrusion 57 is provided on the ridge portion 56, the point-like protrusion 57 is positioned in contact with the ridge portion 56 from below. Thereby, positioning in the circumferential direction of each separation disk 51A can be easily performed. Moreover, since it is the dotted | punctate protrusion 57, the contact area with the dotted | punctate protrusion 57 in the ridge part 56 can be decreased, and the flow of the collected oil can be made smooth. Further, since the other point-like protrusions 57 are provided on the inclined plane 53 in a staggered arrangement, the separation space SP2 is formed while ensuring the area of the oil film OF formed on the surface of the separation disk 51A. It can be secured.

Next, a second embodiment of the separation disk 51 will be described with reference to FIGS. 13A to 15. Here, FIGS. 13A to 13C are a perspective view, a plan view, and a side view of the separation disk 51B of the second embodiment. 14A to 14E are views for explaining a cross section of the separation disk 51B of the second embodiment. These drawings correspond to FIGS. 9A to 10E drawn for the separation disk 51A of the first embodiment.

The separation disk 51B of the second embodiment is different from the separation disk 51A of the first embodiment in that the outer peripheral side portion 52 is a regular 12-sided truncated pyramid shape. The other configuration is the same as that of the separation disk 51A of the first embodiment. For example, regarding the protrusions for forming the separation space SP2, the dot-like protrusions 57 are also used in the separation disk 51 of the second embodiment. That is, the ridge portion 56 is provided with four point-like protrusions 57, and the inclined plane 53 is provided with a plurality of point-like protrusions 57 arranged in a staggered manner. Further, a regular octagonal mounting opening 55 is provided for the inner peripheral side portion 54.

FIG. 15 is a graph showing a test result of the separation efficiency of the mist oil by the separation disk 51B of the second embodiment (regular dodecagonal frustum type). In this test, the case where the separation disk 51B of the second embodiment is used is compared with the case where a general truncated cone type separation disk is used. The contents of the test are the same as in the case where the separation disk 51A of the first embodiment is used, and the description thereof is omitted here.

As shown in FIG. 15, it was found that when the separation disk 51B of the second embodiment is used, a higher separation efficiency than that of the truncated cone type separation disk can be obtained. That is, as the flow rate of blow-by gas increased to 100 L / min, 200 L / min, and 300 L / min, the separation disk 51B of the second embodiment achieved higher separation efficiency than the truncated cone type separation disk.

This is also considered to be an effect of the ridge 56. Also in the separation disk 51B of the second embodiment, the oil film OF that has taken in the oil mist moves toward the ridge portion 56, is collected by the ridge portion 56, and moves in the outer peripheral direction. Since the oil discharged from the end of the ridge 56 is in the form of large droplets, it is considered that the trouble that the oil mist taken in becomes mist again is prevented.

When comparing the test results of FIG. 12 and FIG. 15, the separation disk 51A of the first embodiment has higher oil mist separation efficiency in the high flow rate region than the separation disk 51B of the second embodiment. It was. This is considered due to the fact that the amount of oil collected in one ridge 56 is greater in the separation disk 51A of the first embodiment than in the separation disk 51B of the second embodiment. That is, regarding the oil droplets discharged from the ridge 56, it is considered that the separation disk 51A of the first embodiment is larger than the separation disk 51B of the second embodiment and is not easily misted.

The above description of the embodiment is intended to facilitate understanding of the present invention and does not limit the present invention. The present invention can be changed and improved without departing from the gist thereof, and the present invention includes equivalents thereof. For example, you may comprise as follows.

FIG. 16A is a perspective view for explaining a separation disk 51C of the third embodiment. FIG. 16B is a perspective view for explaining a separation disk 51D of the fourth embodiment. The separation disk 51 of these embodiments is characterized by being configured by a plurality of ribs 58 with respect to a protrusion for forming a separation space SP2 between separation disks 51 adjacent in the stacking direction.

That is, the separation disk 51C of the third embodiment is a regular octagonal truncated pyramid shape in plan view, like the separation disk 51A of the first embodiment, and one separation plane 53 is provided. The ribs 58 are provided along the tilt direction in a state of penetrating the left and right centers of the tilt plane 53. Further, the separation disk 51D of the fourth embodiment has a regular dodecagonal truncated pyramid shape in plan view like the separation disk 51B of the second embodiment, and one separation plane 53 is provided for one inclined plane 53. The ribs 58 are provided along the tilt direction in a state of penetrating the left and right centers of the tilt plane 53. According to these

separation disks

51C and 51D, the oil film OF formed on the inclined plane 53 is also collected by the ribs 58. And since the collected oil can be discharged in the form of droplets, it is possible to prevent a problem that the oil mist taken in becomes mist again.

FIG. 17A and FIG. 17B are a perspective view and a plan view for explaining a separation disk 51E of the fifth embodiment. FIGS. 17C and 17D are perspective views for explaining a separation disk 51F of the sixth embodiment. The

separation disks

51E and 51F of these embodiments are characterized in that the outer edge 59 of the inclined plane 53 connecting the outer peripheral side ends of a pair of adjacent ridges 56 protrudes in a mountain shape in the inclination direction. Yes. That is, the separation disk 51 of the fifth embodiment has eight ridges 56, but the outer edge 59 of the inclined plane 53 protrudes in a mountain shape, so that it is a regular hexagonal truncated pyramid in plan view. It is a type. Further, the separation disk 51 of the sixth embodiment has twelve ridges 56, but since the outer edge 59 of the inclined plane 53 protrudes in a mountain shape, a truncated pyramid having a regular 24-angle shape in plan view. It is a type. According to these separation discs 51, since the outer edge 59 of the inclined plane 53 protrudes in a mountain shape, the length of the inclined plane 53 in the inclined direction can be increased by the amount of protrusion. Thereby, the formation area of the oil film OF can be expanded, and the separation efficiency of the mist-like oil can be increased.

18A and 18B are a perspective view and a plan view for explaining a separation disk 51G of the seventh embodiment. 18C and 18D are perspective views for explaining the separation disk 51H of the eighth embodiment. The separation disk 51 of these embodiments is characterized in that the outer edge 60 of the inclined plane 53 connecting the outer peripheral side ends of a pair of adjacent ridges 56 protrudes in an arc shape in the inclination direction. . That is, the separation disk 51 of the eighth embodiment has eight ridges 56, and the outer edge 60 of the inclined plane 53 protrudes in an arc shape. Thereby, it becomes a perfect circle shape by planar view. Further, the separation disk 51 of the sixth embodiment has twelve ridges 56, and the outer edge 60 of the inclined plane 53 protrudes in an arc shape. Thereby, it becomes a perfect circle shape by planar view. According to these

separation disks

51G and 51H, since the outer edge 60 of the inclined plane 53 protrudes in an arc shape, the length of the inclined plane 53 in the inclined direction can be increased by the amount of protrusion. Thereby, the formation area of the oil film OF can be expanded, and the separation efficiency of the mist-like oil can be increased.

It should be noted that the inventions described in the above embodiments can be combined as appropriate. For example, the ribs 58 provided on the separation disk 51 of the third and fourth embodiments may be used in place of the point-like protrusions 57 of the fifth to eighth embodiments.

Further, in each of the above-described embodiments, the processing target gas is exemplified by blow-by gas. However, any gas containing mist-like oil to be separated can be used as the processing target gas.

DESCRIPTION OF SYMBOLS 1 ... Closed crankcase ventilation system, 2 ... Oil separator, 3 ... Breather pipe, 4 ... Engine, 5 ... Gas outlet pipe, 6 ... Intake side flow path, 7 ... Air filter, 8 ... Turbocharger, 9 ... Charge cooler , 11 ... Housing, 12 ... Lower case, 13 ... Upper case, 14 ... Lower case fitting part, 15 ... Lower end part of upper case, 16 ... Communication cylinder part, 17 ... Flange, 18 ... Suction pipe, 19 ... oil guide pipe, 20 ... joint part of oil guide pipe, 21 ... oil supply pipe, 22 ... main body cover, 23 ... top cover, 24 ... gas discharge part, 25 ... outlet pipe, 26 ... PCV valve, 27 ... rotor unit , 28 ... partition member, 29 ... fixed frame, 29a ... through hole in the fixed frame, 31 ... rotor, 32 ... spindle, 33 ... spindle 34, separation disk group, 35 ... upper holder, 35a ... disk holding part, 35b ... plate-like member, 36 ... lower holder, 37 ... coupling arm, 37 '... lateral arm, 38 ... nozzle, 38a ... nozzle body, 38b ... injection port, 39 ... first oil supply path, 40 ... second oil supply path, 41 ... lower seal member, 42 ... upper seal member, 43 ... outer peripheral part of partition member, 44 ... collar part of partition member, 45 ... Tapered portion of partition member, 45a ... Upper end opening of taper portion, 46 ... Diaphragm of PCV valve, 47 ... Upper spring of PCV valve, 48 ... Lower spring of PCV valve, 51 ... Separation disk, 51A ... First implementation Type separation disk, 51B ... separation disk of the second embodiment, 51C ... separation disk of the third embodiment, 51D ... separation disk of the fourth embodiment, 51E ... separation disk of the fifth embodiment, 51F ... separation disk of the sixth embodiment, 51G ... separation disk of the seventh embodiment, 51H ... separation disk of the eighth embodiment, 52 ... outer peripheral side part, 53 ... inclined plane, 54 ... Inner peripheral side part, 55 ... Mounting opening, 56 ... Ridge part, 57 ... Point-like projection, 58 ... Rib, 59 ... Outer edge of the inclined plane protruding in a mountain shape, 60 ... Inclined plane protruding in an arc shape Outer edge, SP1 ... inner space, SP2 ... separation space, SP3 ... other separation space, OF ... oil film, BL ... boundary layer

Claims

A gas to be treated containing mist-like oil and separation oil are introduced into an inner circumferential space of a rotor that is rotatably provided with a spindle, and the rotor is rotated to rotate the mist-like oil from the gas to be treated. Separating discs used in oil separators to be separated and constituting a separating disc group possessed by the rotor by being stacked in the axial direction of the spindle,
An outer peripheral side portion constituted by a plurality of inclined planes extending in an inclination direction between the radial direction and the thrust direction, and an inner peripheral side portion closer to the rotation center than the outer peripheral side portion,
The outer peripheral side portion is provided with a protrusion that is in contact with the other separation disk adjacent in the stacking direction and forms a separation space between the separation disk,
An oil separator separation disk, wherein a ridge portion extending in the tilt direction is provided at a boundary between a pair of adjacent tilt planes.
2. The separation disk for an oil separator according to claim 1, wherein at least a part of the protrusion is provided on the ridge.
3. The oil separator separation disk according to claim 1 or 2, wherein the protrusion is constituted by a plurality of point-like protrusions.
4. The oil separator separation disk according to claim 3, wherein the dotted protrusions are provided on the inclined plane in a staggered arrangement.
The separation for an oil separator according to claim 1 or 2, wherein the protrusion is constituted by a plurality of ribs, and the ribs are provided on the inclined plane along the inclined direction. disk.
6. The outer edge of the inclined plane that connects the outer peripheral side ends of a pair of adjacent ridges protrudes in a mountain shape toward the inclined direction. 6. Separation disc for oil separator as described.
6. The outer edge of the inclined plane connecting the outer peripheral side ends of a pair of adjacent ridges protrudes in an arc shape toward the inclined direction. 6. Separation disc for oil separator as described in 1.
Used in an oil separator that separates the mist-like oil from the gas to be treated containing mist-like oil, and is rotated together with the spindle in a state where the gas to be treated and the separation oil are introduced into the inner circumferential space, A rotor for separating the mist oil from a gas to be treated,
A separation disk group composed of a plurality of separation disks stacked in the axial direction of the spindle, and a holder pair that holds the separation disk group in the stacking direction of the separation disks;
The separation disc has an outer peripheral side portion constituted by a plurality of inclined planes extending in an inclination direction between a radial direction and a thrust direction, and an inner peripheral side portion closer to the rotation center than the outer peripheral side portion,
The outer peripheral side portion is provided with a protrusion that is in contact with the other separation disk adjacent in the stacking direction and forms a separation space between the separation disk,
A rotor for an oil separator, wherein a ridge portion extending in the tilt direction is provided at a boundary between a pair of adjacent tilt planes.
An oil separator for separating the mist-like oil from a gas to be treated containing mist-like oil,
A rotor that separates the mist-like oil from the processing target gas by rotating together with the spindle in a state where the processing target gas and the separation oil are introduced into the inner circumferential space;
The rotor has a separation disk group composed of a plurality of separation disks stacked in the axial direction of the spindle, and a holder pair that holds the separation disk group sandwiched in the stacking direction of the separation disks,
The separation disks are stacked in the axial direction of the spindle to constitute a separation disk group included in the rotor, and are constituted by a plurality of inclined planes extending in an inclination direction between a radial direction and a thrust direction. An outer peripheral side portion, and an inner peripheral side portion closer to the rotation center than the outer peripheral side portion,
The outer peripheral side portion is provided with a protrusion that is in contact with the other separation disk adjacent in the stacking direction and forms a separation space between the separation disk,
An oil separator, characterized in that a ridge portion extending in the tilt direction is provided at a boundary between a pair of adjacent tilt planes.