JP2018197523A - Oil mist separator - Google Patents

Abstract

To provide an oil mist separator which can improve an oil collection rate by shortening a time until an oil head is established, and in which a drain pipe can be reduced in size.SOLUTION: In an oil mist separator 1, a partitioning plate 23 is arranged in a drain pipe 17 along an axial so as to partition the inside of the drain pipe into a first chamber 21 on a side near a flow-out port 3 and a second chamber 22 on a side remote from the flow-out port, the first chamber and the second chamber communicate with each other at their upper end sides, and communicate with each other at their lower end sides. A drain hole 18 is formed at a lower part rather than a lower end of the partitioning plate on the second chamber side when viewing the drain pipe in an axial direction, and when a blowby gas flows into the drain pipe from the drain hole, the blowby gas passes through the second chamber and flows toward the flow-out port through the inside of the housing 4.SELECTED DRAWING: Figure 2

Description

  The present invention relates to an oil mist separator, and more particularly to an oil mist separator that separates oil mist contained in blow-by gas generated in an engine.

  As a conventional oil mist separator, a housing having a blow-by gas inlet and outlet is provided, and in the housing, a separator portion for separating oil mist in the blow-by gas flowing from the inlet is provided. The upper end side of the drain pipe in which the oil separated by the separator part is stored is connected to the bottom surface part, and the drain hole for discharging the oil stored in the drain pipe is formed on the lower end side of the drain pipe. Those are generally known (for example, see Patent Document 1).

  Patent Document 1 describes that a wall (collision wall 40) is provided immediately above the drain pipe (first drain passage 25) to suppress the oil jet from the drain pipe (paragraph [0026]). [0028] and FIG. In this drain pipe, normally, the drain head is formed with the drain hole closed by oil due to the balance between the weight of the oil stored in the drain pipe and the pressure difference between the inside and outside of the housing. Inflow of blow-by gas into the pipe is restricted.

Japanese Patent No. 5737420 JP 2004-162625 A

  However, in the technique described in Patent Document 1, since the inside of the drain pipe is formed in one cylindrical space, it takes time to establish the oil head, and blow-by from the drain hole to the drain pipe before the oil head is established. Gas will flow in. The blow-by gas that has flowed into the drain pipe flows out of the housing from the outlet without being subjected to separation processing at the separator portion, so that the oil collection rate is lowered. Furthermore, a large amount of oil is required to establish the oil head, and it is necessary to increase the height or volume of the drain pipe.

  Note that Patent Document 2 describes a technique of partitioning an internal space of a concave portion recessed downward by a partition plate. However, in the technique described in Patent Document 2, the drain hole is always open, and the above-described oil head is not established.

  The present invention has been made in view of the above situation, and provides an oil mist separator capable of improving the oil collection rate by shortening the time until formation of the oil head and reducing the size of the drain pipe. The purpose is to do.

In order to solve the above problem, the invention according to claim 1 includes a housing having an inlet and an outlet for blow-by gas, and oil mist in the blow-by gas flowing from the inlet is contained in the housing. A separator part for separation is provided, and an upper end side of a drain pipe for storing oil separated by the separator part is connected to a bottom surface part of the housing, and a drain pipe is connected to the lower end side of the drain pipe. A drain hole for discharging oil stored in the pipe is formed, and depending on the correlation between the weight of the oil stored in the drain pipe and the pressure difference between the inside and outside of the housing, the drain hole enters the drain pipe. An oil mist separator capable of restricting the flow of blow-by gas, wherein the drain pipe includes the drain pipe Is partitioned along the axial direction so as to partition the first chamber closer to the outflow port and the second chamber farther from the outlet, and the first chamber and the second chamber Each of the chambers is connected to each upper end side, and each lower end side is connected, and the drain hole is below the lower end of the partition plate on the second room side when the drain pipe is viewed from the axial direction. When blow-by gas flows into the drain pipe from the drain hole, the blow-by gas passes through the second chamber and flows through the housing toward the outlet. The gist.
According to a second aspect of the present invention, in the first aspect of the present invention, oil blown up from an upper end side of the second chamber when blow-by gas passes through the second chamber in the housing. The gist of the present invention is that a guide portion is provided to flow into the first room from the upper end side.
The invention according to claim 3 is the invention according to claim 2, wherein the guide portion includes a first guide wall that covers the first room and the second room from above.
According to a fourth aspect of the present invention, in the third aspect of the present invention, the guide portion includes a second guide wall extending downward from the first guide wall, and the second guide wall is configured to pivot on the drain pipe. The gist is that it is arranged on the opposite side of the second room across the first room as seen from the direction.
The invention according to claim 5 is the invention according to any one of claims 1 to 4, wherein the second chamber is provided between a side surface of the partition plate and an inner wall surface of the drain pipe. The gist is that a gap is formed to allow oil in the second chamber to flow into the first chamber when blow-by gas passes.
The gist of the invention according to claim 6 is that, in the invention according to any one of claims 1 to 5, the drain hole is formed in a lower end surface portion of the drain pipe.

According to the oil mist separator of the present invention, the partition plate is arranged in the drain pipe in the axial direction so as to partition the drain pipe into the first chamber closer to the outlet and the second chamber farther from the outlet. The first chamber and the second chamber are connected to each other at the upper end side, and the lower end sides thereof are connected to each other. The drain hole is a second hole when the drain pipe is viewed from the axial direction. When the blow-by gas flows into the drain pipe from the drain hole, the blow-by gas passes through the second chamber and flows out through the housing. It flows toward. As a result, when the oil separated from the blow-by gas in the separator is stored in the drain pipe, if the blow-by gas flows into the drain pipe from the drain hole, the blow-by gas passes through the second chamber. While flowing through the housing towards the outlet, little or no entry into the first chamber. Therefore, a large amount of oil is stably accumulated in a short time in the first chamber. The balance between the weight of the oil accumulated in the drain pipe and the pressure difference between the inside and outside of the housing establishes an oil head in which the drain hole is closed with oil, and the blow-by gas from the drain hole into the drain pipe is formed. Inflow is regulated. As a result, it is possible to improve the oil collection rate by shortening the time until the oil head is established. Furthermore, since the oil head is formed with a small amount of oil, the drain pipe can be downsized.
Further, when the guide portion is provided in the housing, the oil blown up from the upper end side of the second chamber when blow-by gas passes through the second chamber by the guide portion. From the upper end side. Therefore, more oil can be stored in the first chamber in a shorter time.
Further, in the case where the guide unit includes a first guide wall that covers the first chamber and the second chamber from above, oil that is blown up from the upper end side of the second chamber by the first guide wall is first. It effectively flows into the room 1 from the upper end side.
Further, the guide portion includes a second guide wall extending downward from the first guide wall, and the second guide wall sandwiches the first chamber when the drain pipe is viewed from the axial direction. In the case of being arranged on the opposite side of the room, the first and second guide walls effectively cause the oil sprayed from the upper end side of the second room to flow into the first room from the upper end side.
Further, when a gap is formed between the side surface of the partition plate and the inner wall surface of the drain pipe, when blow-by gas passes through the second chamber, the oil in the second chamber becomes a gap. Through and into the first room. Therefore, more oil can be stored in the first chamber in a shorter time.
Furthermore, when the drain hole is formed in the lower end surface portion of the drain pipe, it is possible to further shorten the time until the oil head is established and to further reduce the size of the drain pipe.

The present invention will be further described in the following detailed description with reference to the drawings referred to, with reference to non-limiting examples of exemplary embodiments according to the present invention. Similar parts are shown throughout the several figures.
It is the top view which fractured | ruptured a part of oil mist separator which concerns on an Example. It is the II-II sectional view taken on the line of FIG. It is a principal part enlarged view of FIG. FIG. 4 is an enlarged sectional view taken along line IV-IV in FIG. 2. It is action | operation explanatory drawing of the said oil mist separator, (a) shows the state before an oil head is established, (b) shows the state after an oil head is established. It is a perspective view of the oil mist separator. It is the VII-VII sectional view taken on the line of FIG. It is explanatory drawing of the oil mist separator which concerns on another form. It is explanatory drawing of the oil mist separator which concerns on another form. It is explanatory drawing of the oil mist separator which concerns on another form.

  The items shown here are exemplary and illustrative of the embodiments of the present invention, and are the most effective and easy-to-understand explanations of the principles and conceptual features of the present invention. It is stated for the purpose of providing what seems to be. In this respect, it is not intended to illustrate the structural details of the present invention beyond what is necessary for a fundamental understanding of the present invention. It will be clear to those skilled in the art how it is actually implemented.

  The oil mist separator according to the present embodiment includes a housing (4) having an inlet (2) and an outlet (3) for blow-by gas, and the oil mist in the blow-by gas flowing from the inlet is contained in the housing. A separator part (12) for separation is provided, and an upper end side of a drain pipe (17) for storing oil separated by the separator part is connected to a bottom surface part of the housing, and a lower end side of the drain pipe is connected to the lower end side of the drain pipe. The drain holes (18, 18A) for discharging the oil stored in the drain pipe are formed, and the drain from the drain hole depends on the correlation between the weight of the oil stored in the drain pipe and the pressure difference inside and outside the housing. An oil mist separator (1) capable of regulating the flow of blow-by gas into a pipe (for example, see FIGS. 1 to 3). In the drain pipe (17), the drain pipe is partitioned into a first room (21) closer to the outlet (3) and a second room (22) farther. The partition plates (23, 23A) are provided along the axial direction, and the first chamber and the second chamber are communicated with each other at the upper end side, and are communicated at the respective lower end sides. (18, 18A) is disposed below the lower end of the partition plate (23, 23A) on the second chamber (22) side when the drain pipe (17) is viewed from the axial direction, and the drain hole (18, 18A) ), When blow-by gas flows into the drain pipe (17), the blow-by gas passes through the second chamber (22) and flows through the housing (4) toward the outlet (3).

  In the oil mist separator (1), the drain pipe (18, 18A) from the drain hole (18, 18A) is usually balanced by the weight of the oil accumulated in the drain pipe (17) and the pressure difference between the inside and outside of the housing (4). When the inflow of blow-by gas into the inside is restricted and the weight of the oil in the drain pipe exceeds the pressure difference between the inside and outside of the housing, the oil in the drain pipe is discharged from the drain hole so that they are balanced. In addition, the first chamber (21) usually has an outlet (3) than the second chamber (22) in the flow path connecting the outlet (3) and the drain pipe (17) in the housing (4). ) Is closer to the side. Further, in the second chamber (22), 80-100% (preferably 90-100%, preferably) of the blow-by gas flowing into the drain pipe (17) from the drain hole (18, 18A). In particular 95-100%). Furthermore, the distance (H) between the lower end of the partition plate (23, 23A) and the upper surface of the lower end surface portion (17a) of the drain pipe (17) is, for example, 1 to 15 mm (preferably 2 to 10 mm, particularly 3 to 3. 7 mm) (for example, see FIG. 2 etc.). Moreover, the shape, material, installation form, etc. of the housing (4) are not particularly limited. In addition, the shape, number, installation form, etc. of the drain pipe (17) are not particularly limited. Furthermore, the shape, material, installation form, etc. of the partition plate (23, 23A) are not particularly limited.

  As the oil mist separator according to the present embodiment, for example, oil blown up from the upper end side of the second chamber when blow-by gas passes through the second chamber (22) in the housing (4). The form (for example, refer FIG. 5 etc.) with which the guide part (35, 35A) which flows in into a 1st room (21) from an upper end side is provided is mentioned.

  In the case of the above-mentioned form, for example, the guide part (35, 35B) includes a first guide wall (36, 36A) that covers the first room (21) and the second room (22) from above. (For example, see FIG. 5). In this case, for example, the guide portion (35) includes a second guide wall (37, 37A) extending downward from the first guide wall (36, 36A), and the second guide wall includes a drain pipe (17). It can be arranged on the opposite side of the second room (22) across the first room (21) when viewed from the axial direction.

  As an oil mist separator according to the present embodiment, for example, blow-by gas is provided in the second chamber (22) between the side surfaces of the partition plates (23, 23A) and the inner wall surface of the drain pipe (17). The form (for example, refer FIG. 4 etc.) in which the clearance gap (S) into which the oil in a 2nd chamber (22) flows in into a 1st chamber (21) when passing is formed is mentioned. Examples of the gap (S) include 0.1 to 5 mm (preferably 0.3 to 3 mm, particularly 0.5 to 2 mm).

  As the oil mist separator according to the present embodiment, for example, the drain hole (18) is formed in the lower end surface portion (17a) of the drain pipe (17) (see, for example, FIG. 2).

  In addition, the code | symbol in the parenthesis of each structure described in the said embodiment shows the correspondence with the specific structure as described in the Example mentioned later.

  Hereinafter, the present invention will be specifically described with reference to the drawings. In this embodiment, as an “oil mist separator” according to the present invention, an oil mist separator externally attached to an engine cylinder block is exemplified.

(1) Configuration of Oil Mist Separator The oil mist separator 1 according to the present embodiment includes a housing 4 having a blow-by gas inlet 2 and an outlet 3 as shown in FIGS. The housing 4 includes a box-shaped case 5 that opens downward, and a closing plate 6 that is attached to the case 5 so as to close the opening of the case 5. The case 5 and the closing plate 6 are made of resin and are joined to each other by vibration welding or the like. Further, the inflow port 2 is constituted by a through hole formed on one end side of the closing plate 6. Further, the outflow port 3 is constituted by a pipe protruding from one end of the upper surface portion of the case 5. Furthermore, the outflow port 3 is connected to an intake system (not shown).

  The housing 4 is provided with a covering member 8 so as to cover the bottom surface portion thereof. The covering member 8 is formed in a box shape having an upper opening. Further, as shown in FIG. 2, an inlet 9 for introducing blow-by gas into the covering member 8 is provided on the bottom surface of the covering member 8. The introduction port 9 is disposed so as to surround a lower end side of a drain pipe 17 described later. Further, the cover member 8 is attached to the cylinder block 40 so that the introduction port 9 communicates with a blow-by gas recirculation path (not shown) formed in the engine.

  As shown in FIG. 1, a gas flow path 11 in which blow-by gas flowing in from the inlet 2 flows toward the outlet 3 is formed in the housing 4, and in the blow-by gas flowing through the gas flow path 11. The separator part 12 which isolate | separates the oil mist contained in is provided. The separator portion 12 includes an ejection wall 13 in which a nozzle hole 14 is formed, and a collision wall 15 disposed so as to face the nozzle hole 14 on the downstream side of the ejection wall 13 (see FIG. 7). . The injection wall 13 is provided so as to partition the gas flow path 11 into an upstream side and a downstream side. Further, each of the injection wall 13 and the collision wall 15 is formed integrally with the case 5. The blow-by gas flowing into the housing 4 from the inlet 2 and flowing through the gas flow path 11 is increased in flow velocity when passing through the nozzle hole 14 of the injection wall 13 and collides with the collision wall 15, thereby causing oil mist. Are separated.

  As shown in FIGS. 1 to 3, the upper end side of the drain pipe 17 in which the oil separated from the blow-by gas is stored in the separator portion 12 is connected to the bottom surface portion of the housing 4 (specifically, the closing plate 6). ing. The drain pipe 17 is formed in a bottomed elliptical cylindrical shape. Further, the drain pipe 17 is disposed in the housing 4 on the downstream side of the separator portion 12 in the blow-by gas flow direction. Further, a drain hole 18 for discharging oil accumulated in the drain pipe 17 is formed on the lower end side of the drain pipe 17.

  In the drain pipe 17, a partition plate 23 extends along the axial direction so as to partition the drain pipe 17 into a first chamber 21 on the side closer to the outlet 3 and a second chamber 22 on the far side. Is provided. On the upper side surface of the partition plate 23, a protrusion 25 protruding sideways is formed (see FIGS. 3 and 4). The protrusion 25 is fitted into a concave fitting portion 26 formed on the bottom surface portion of the housing 4 (specifically, the upper surface of the closing plate 6). Further, the upper end side of the partition plate 23 protrudes from the upper end side of the drain pipe 17, and the lower end thereof is separated from the upper surface of the lower end surface portion 17 a of the drain pipe 17 with a predetermined interval H (for example, 5 mm). Further, between the both side surfaces of the partition plate 23 and the inner wall surface of the drain pipe 17, the oil in the second chamber 22 is transferred into the first chamber 21 when blow-by gas passes through the second chamber 22. A gap S is formed at a predetermined interval (for example, 1 mm) that flows into the gas (see FIG. 4).

  The first chamber 21 and the second chamber 22 communicate with each other at the upper end side and communicate with each lower end side. Specifically, each upper end side of the first and second chambers 21 and 22 is a communication formed between the upper end of the partition plate 23 and the upper surface portion of the housing 4 (specifically, the upper surface portion of the case 5). It communicates via the space 31 (refer FIG. 2). The lower ends of the first and second chambers 21 and 22 are communicated with each other via a communication space 32 formed between the lower end of the partition plate 23 and the lower end surface portion 17a of the drain pipe 17. Furthermore, the first chamber 21 is closer to the outlet 3 than the second chamber 22 in the flow path 41 connecting the outlet 3 and the drain pipe 17 in the housing 4 (see FIG. 1). The channel 41 is formed in a substantially U shape by a partition wall 42 raised from the bottom surface of the housing 4.

  The drain hole 18 is disposed below the lower end of the partition plate 23 on the second chamber 22 side when the drain pipe 17 is viewed from the axial direction. Therefore, when blow-by gas flows into the drain pipe 17 from the drain hole 18, substantially all of the blow-by gas passes through the second chamber 22 and flows in the housing 4 toward the outlet 3. Specifically, the drain hole 18 is formed in the lower end surface portion 17 a of the drain pipe 17. Furthermore, the drain hole 18 is formed in a planar circle.

  In the housing 4, there is a guide portion 35 that allows oil blown from the upper end side of the second chamber 22 to flow into the first chamber 21 from the upper end side when blow-by gas passes through the second chamber 22. (See FIG. 5A). The guide portion 35 includes a first guide wall 36 that covers the first and second chambers 21 and 22 from above, and a second guide wall 37 that hangs downward from the first guide wall 36. The first guide wall 36 is configured by an upper surface portion of the housing 4 (specifically, an upper surface portion of the case 5). The second guide wall 37 is disposed on the opposite side of the second chamber 22 across the first chamber 21 when the drain pipe 17 is viewed from the axial direction. Further, the second guide wall 37 is disposed so as to cover the upper space of the first room 21 from the side.

(2) Operation of Oil Mist Separator Next, the operation of the oil mist separator 1 having the above configuration will be described. As shown by phantom arrows in FIGS. 1 and 2, blow-by gas generated in the engine flows in the cover member 8 through the inlet 9, flows into the housing 4 from the inlet 2, and enters the separator portion 12. pass. At this time, blow-by gas is injected from the nozzle hole 14 of the injection wall 13 and collides with the collision wall 15, thereby separating the oil mist. The blow-by gas from which the oil mist is separated flows toward the outlet 3 in the housing 4 and is sent to the intake system via the outlet 3.

  On the other hand, the oil separated by the separator portion 12 flows toward the drain pipe 17 on the bottom surface portion (specifically, the closing plate 6) of the housing 4 as shown by broken line arrows in FIGS. It is stored in the drain pipe 17. At that time, blow-by gas flows from the drain hole 18 into the drain pipe 17 until the weight of the oil in the drain pipe 17 and the pressure difference between the inside and outside of the housing 4 are balanced (that is, the oil head is established) (FIG. 5 ( a)). At this time, blow-by gas (indicated by phantom arrows in FIG. 5) that flows into the drain pipe 17 passes through the second chamber 22 and flows through the housing 4 toward the outlet 3. Almost no entry into the first room 21. Therefore, in the first chamber 21, a large amount of oil is stably accumulated in a short time, and the oil head is established (see FIG. 5B). When the weight of the oil in the drain pipe 17 exceeds the pressure difference between the inside and outside of the housing 4, the oil in the drain pipe 17 is discharged from the drain hole 18 so that they are balanced and returned to the oil reservoir in the engine. .

  Furthermore, when blow-by gas passes through the second chamber 22, the blow-by gas rises in the second chamber 22 in a relatively large valve shape. Therefore, the oil is blown up from the upper end side of the second chamber 22 together with the blow-by gas. The sprayed oil collides with the guide walls 36 and 37, travels through the guide walls 36 and 37, and flows into the first chamber 21 from the upper end side. Furthermore, when blow-by gas passes through the second chamber 22, the oil in the second chamber 22 flows into the first chamber 21 through the gap S due to the passage pressure of the blower gas.

(3) Effects of the Example According to the oil mist separator 1 of the present example, the drain pipe 17 includes the first chamber 21 on the side closer to the outlet 3 in the drain pipe 17 and the second on the far side. A partition plate 23 is provided along the axial direction so as to partition the first chamber 21 and the second chamber 22, and the first chamber 21 and the second chamber 22 communicate with each other at the upper end side and communicate with each lower end side. The drain hole 18 is disposed below the lower end of the partition plate 23 on the second chamber 22 side when the drain pipe 17 is viewed from the axial direction, and blow-by gas is introduced into the drain pipe 17 from the drain hole 18. When flowing in, the blow-by gas passes through the second chamber 22 and flows in the housing 4 toward the outlet 3. As a result, when the oil separated from the blow-by gas in the separator 12 is accumulated in the drain pipe 17, when the blow-by gas flows into the drain pipe 17 from the drain hole 18, the blow-by gas is stored in the second chamber 22. While passing through the interior and flowing through the housing 4 toward the outlet 3, the first chamber 21 hardly or does not enter the first chamber 21. Therefore, a large amount of oil is stably accumulated in the first chamber 21 in a short time. Then, due to the balance between the weight of the oil accumulated in the drain pipe 17 and the pressure difference between the inside and outside of the housing 4, an oil head is formed in which the drain hole 18 is closed with oil. Inflow of blowby gas into the water is regulated. As a result, it is possible to improve the oil collection rate by shortening the time until the oil head is established. Furthermore, since the oil head is established with a small amount of oil, the drain pipe 17 can be downsized.

  In the present embodiment, a guide portion 35 is provided in the housing 4. Thereby, the oil blown up from the upper end side of the second chamber 22 when the blow-by gas passes through the second chamber 22 is caused to flow into the first chamber 21 from the upper end side by the guide portion 35. Therefore, a large amount of oil is stored in the first chamber 21 in a shorter time.

  In the present embodiment, the guide portion 35 includes a first guide wall 36 that covers the first chamber 21 and the second chamber 22 from above, a second guide wall 37 that extends downward from the first guide wall 36, and The second guide wall 37 is disposed on the opposite side of the second chamber 22 across the first chamber 21 when the drain pipe 17 is viewed from the axial direction. Thereby, the oil spouted from the upper end side of the second chamber 22 is effectively flowed into the first chamber 21 from the upper end side by the first and second guide walls 21 and 22.

  In this embodiment, a gap S is formed between the side surface of the partition plate 23 and the inner wall surface of the drain pipe 17. Thereby, when blow-by gas passes through the second chamber 22, the oil in the second chamber 22 flows into the first chamber 21 through the gap S. Therefore, a large amount of oil is stored in the first chamber 21 in a shorter time.

  Further, in the present embodiment, the drain hole 18 is formed in the lower end surface portion 17 a of the drain pipe 17. As a result, the time until the oil head is established can be further shortened, and the drain pipe 17 can be further miniaturized.

  In the present invention, the present invention is not limited to the above embodiment, and various modifications can be made within the scope of the present invention depending on the purpose and application. That is, in the above-described embodiment, the oil mist separator 1 externally attached to the engine has been exemplified. However, the present invention is not limited to this. For example, an oil mist separator provided integrally with the cylinder head cover of the engine may be used. In this case, the housing is constituted by the cylinder head cover and the baffle plate.

  Moreover, in the said Example, although the flat plate-shaped 1st guide wall 36 and the 2nd guide wall 37 were illustrated, it is not limited to this, For example, as shown in FIG. Alternatively, the second guide wall 37A may be used. Moreover, in the said Example, although the 1st guide wall 36 comprised by the upper surface part (specifically upper surface part of case 5) of the housing 4 was illustrated, it is not limited to this, For example, as shown in FIG. In addition, the first guide wall 36 </ b> A may be different from the upper surface portion of the housing 4.

  Moreover, in the said Example, although the guide part 35 provided with the 1st guide wall 36 and the 2nd guide wall 37 was illustrated, it is not limited to this, For example, as shown in FIG. Alternatively, the guide portion 35A including only the first guide wall 36 may be used.

  Moreover, in the said Example, although the form which guides the oil spouted from the upper end side of the 2nd chamber 22 by the guide part 35 in the 1st chamber 21 was illustrated, it is not limited to this, For example, 2nd A lid wall may be provided immediately above the room 22 so that oil cannot be sprayed from the upper end side of the second room 22.

  Moreover, in the said Example, although the form which forms the clearance gap S between the side surface of the partition plate 23 and the inner wall face of the drain pipe 17 was illustrated, it is not limited to this, For example, as shown in FIG. It is good also as a form which does not form the clearance gap S between the side surface of the board 23, and the inner wall face of the drain pipe 17. FIG.

  Moreover, in the said Example, although the partition plate 23 attached by fitting with respect to the bottom face part of the housing 4 was illustrated, it is not limited to this, For example, instead of or in addition to fitting, the bottom face part of the housing 4 Alternatively, the partition plate may be attached to the drain pipe 17 by adhesion, welding, or the like.

  Moreover, in the said Example, although the partition plate 23 which an upper end side protrudes above the drain pipe 17 was illustrated, it is not limited to this, For example, as shown in FIG. 9, the partition plate which an upper end side is settled in the drain pipe 17 It may be 23A.

  Moreover, in the said Example, although the elliptical cylindrical drain pipe 17 was illustrated, it is not limited to this, For example, it is good also as a cylindrical or square cylindrical drain pipe.

  Moreover, in the said Example, although the drain hole 18 formed in the lower end surface part 17a of the drain pipe 17 was illustrated, it is not limited to this, For example, as shown in FIG. 9, it forms in the outer peripheral surface part of the drain pipe 17. A drain hole 18A may be used.

  Furthermore, in the said Example, although the collision type separator part 12 was illustrated, it is not limited to this, For example, it is good also as a labyrinth type or a centrifugal separator part.

  The foregoing examples are for illustrative purposes only and are not to be construed as limiting the invention. Although the invention has been described with reference to exemplary embodiments, it is to be understood that the language used in the description and illustration of the invention is illustrative and exemplary rather than limiting. As detailed herein, changes may be made in its form within the scope of the appended claims without departing from the scope or spirit of the invention. Although specific structures, materials and examples have been referred to in the detailed description of the invention herein, it is not intended to limit the invention to the disclosure herein, but rather, the invention is claimed. It covers all functionally equivalent structures, methods and uses within the scope.

  The present invention is not limited to the embodiments described in detail above, and various modifications or changes can be made within the scope of the claims of the present invention.

  It is widely used as a technique for separating oil mist contained in blow-by gas.

  DESCRIPTION OF SYMBOLS 1; Oil mist separator, 2; Inlet, 3; Outlet, 4; Housing, 12; Separator part, 17: Drain pipe, 17a; Lower end surface part, 18, 18A; Drain hole, 21; Second chamber, 23, 23A; partition plate, 35, 35A; guide portion, 36, 36A; first guide wall, 37, 37A; second guide wall, S;

Claims (6)

A housing having an inlet and an outlet for blow-by gas is provided, and in the housing, a separator portion for separating oil mist in the blow-by gas flowing from the inlet is provided. A drain pipe for storing the oil separated in the separator portion is connected, and a drain hole for discharging the oil stored in the drain pipe is formed on the lower end side of the drain pipe, An oil mist separator capable of regulating the flow of blow-by gas from the drain hole into the drain pipe according to the correlation between the weight of the oil stored in the drain pipe and the pressure difference between the inside and outside of the housing,
A partition plate is provided in the drain pipe along the axial direction so as to partition the drain pipe into a first chamber closer to the outlet and a second chamber farther from the outlet. ,
The first room and the second room are communicated with each upper end side and communicated with each lower end side,
The drain hole is disposed below the lower end of the partition plate on the second chamber side when the drain pipe is viewed from the axial direction,
An oil mist separator characterized in that when blow-by gas flows into the drain pipe from the drain hole, the blow-by gas passes through the second chamber and flows in the housing toward the outlet. .   A guide portion is provided in the housing for allowing oil blown from the upper end side of the second chamber to flow into the first chamber from the upper end side when blow-by gas passes through the second chamber. The oil mist separator according to claim 1.   The oil mist separator according to claim 2, wherein the guide portion includes a first guide wall that covers the first chamber and the second chamber from above. The guide portion includes a second guide wall extending downward from the first guide wall,
The oil mist separator according to claim 3, wherein the second guide wall is disposed on the opposite side of the second chamber across the first chamber when the drain pipe is viewed from the axial direction.   Between the side surface of the partition plate and the inner wall surface of the drain pipe, when blow-by gas passes through the second chamber, oil in the second chamber flows into the first chamber. The oil mist separator according to any one of claims 1 to 4, wherein a gap is formed.   The oil mist separator according to any one of claims 1 to 5, wherein the drain hole is formed in a lower end surface portion of the drain pipe.

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