JP2002276328A - Gas-liquid separating device of blowby gas - Google Patents

Abstract

PROBLEM TO BE SOLVED: To enhance a centrifugal separation performance and improve oil dropping property of a separated oil component to an oil reserving chamber. SOLUTION: This gas-liquid separating device comprises: a cylindrical closed container 1; a blowby gas introducing pipe 4 which is inserted to a lower side surface 2 of the closed container 1 from a tangent direction; an exhaust pipe 7 having an opening 6 at an upper part inside the closed container; a conical first partition plate 12 which divides the inside of the closed container into an opening 5 side of the blowby gas introducing pipe 4 and the opening 6 side of the exhaust pipe 7; a vent part 13 provided to the first partition plate 12; and a conical second partition plate 21 which divides an inside of the closed container 1 into the opening 5 side of the blowby gas introducing pipe 4 and a bottom side of the closed container. The blowby gas flows on a conical inclined surface of the second partition plate 21, smoothly rotates and rises, and performs the centrifugal separation of the oil component by a sufficient swirl flow. The centrifugally separated oil component flow on the conical inclined surface of the second partition plate 21, and flows down to the oil reserving chamber 17 via an oil dropping hole 22 without remaining on the inclined surface.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a blow-by gas-liquid separation apparatus which applies a swirling flow to blow-by gas discharged from an engine to centrifuge oil contained in the blow-by gas.

[0002]

2. Description of the Related Art Blow-by gas blown from a combustion chamber of an engine into a crankcase through a gap between a cylinder and a piston has an oil component, and if this is discharged into the atmosphere as it is, it causes air pollution. If the air is recirculated to the air cleaner side, the air cleaner will be clogged. For this reason, it is necessary to separate the oil component from the blow-by gas, and various gas-liquid separation devices have been developed so far.

FIG. 4 shows a known gas-liquid separation device for blow-by gas proposed by the applicant earlier.
-78915). In the apparatus, a cylindrical airtight container 1, a blow-by gas introduction pipe 4 inserted tangentially into a lower side surface of the airtight container 1, an exhaust pipe 7 having an opening 6 in an upper part in the airtight container 1, The container 1 includes a conical partition plate 12 that partitions the inside of the container 1 into an opening 5 side of the blow-by gas introduction pipe 4 and an opening 6 side of the exhaust pipe 7. A substantially horizontal partition plate 15 is provided immediately below the opening 6 of the pipe 7, and a slightly inclined partition plate 18 is provided below the opening 5 of the blow-by gas introduction pipe 4. It is.

The blow-by gas 3 introduced into the closed casing 1 from the tangential direction through the blow-by gas introducing pipe 4 is swirled around the exhaust pipe 7 as shown by the arrow, and moves upwardly of the closed casing 1 as shown by the arrow. It is made to flow toward. The oil component contained in the blow-by gas 3 when centrifugally flowing is centrifuged and caught by the inner surface of the side wall of the sealed container 1 and the partition plate 12, and travels along the partition plate 18 to the oil drop hole 19. The oil flows and is stored in the oil storage chamber 17. The blow-by gas 3 from which the oil has been removed is supplied to the ventilation holes 16 formed in the partition plate 15.
Through the partition plate 15 and through the opening 6 into the exhaust pipe 7.

[0005]

When the blow-by gas is blown into the closed vessel 1 from the blow-by gas introduction pipe 4, the gas-liquid separation device for blow-by gas
There is a problem that the centrifugal separation of the oil component has not reached a satisfactory level because the gas cannot rise while swirling smoothly and a sufficient swirling flow cannot be obtained. Further, the gas-liquid separation device is installed in a direction in which the exhaust pipe 7 is substantially vertical in the engine room. Therefore, the partition plate 18 through which the centrifugally separated oil component flows is almost horizontal, and there is a problem that the oil drops into the oil storage chamber 17 is not good. There was also a concern that spills would not be possible. In this case, it is conceivable to increase the inclination of the partition plate 18, but this causes a problem that the formation of the swirling flow is obstructed.

SUMMARY OF THE INVENTION The present invention has been made in view of the above circumstances, and makes it easy to generate a swirling flow of gas to enhance the centrifugal separation performance of an oil component, and to reduce the oil drop of the centrifugally separated oil component into an oil storage chamber. An object of the present invention is to provide an improved blow-by gas-liquid separation device.

[0007]

According to the present invention having the above object, the blow-by gas-liquid separation device according to the first aspect of the present invention comprises a cylindrical closed container and a lower side surface of the closed container. A blow-by gas introduction pipe inserted from the tangential direction to, and an exhaust pipe having an opening at the top in the closed container,
A conical first partition plate for partitioning the inside of the closed container into an opening side of the blow-by gas introduction pipe and an opening side of the exhaust pipe, a vent provided on the first partition plate, A conical second partition plate for partitioning the inside into the opening side of the blow-by gas introduction pipe and the bottom side of the sealed container.

According to a second aspect of the present invention, there is provided a blow-by gas-liquid separation device according to the first aspect, wherein a flow straightening plate extending in the circumferential direction on the blow-by gas blowing direction side is provided above the opening of the blow-by gas introduction pipe. It is characterized by having been done. According to a third aspect of the present invention, the blow-by gas-liquid separation device according to the first or second aspect is characterized in that the blow-by gas introduction pipe is inserted so as to be in contact with the upper side of the slope of the second partition plate. I do. According to a fourth aspect of the present invention, there is provided a gas-liquid separation device for a blow-by gas according to the second or third aspect, wherein the current plate is fixed to an inner surface of a side wall of the closed vessel and an upper side of the slope of the second partition plate. And The blow-by gas-liquid separation device according to claim 5,
In the invention according to any one of claims 1 to 4, a ventilation portion is provided at a central portion of the first partition plate, and an oil passage portion is provided at outer peripheral edges of the first partition plate and the second partition plate. It is characterized by the following.

In the blow-by gas-liquid separation apparatus according to the present invention as well, the blow-by gas introduced from the tangential direction into the closed vessel through the blow-by gas introducing pipe turns around the exhaust pipe around the exhaust pipe. The oil component contained in the blow-by gas is centrifuged by the centrifugal force at that time. The blow-by gas rises while smoothly turning according to the conical shape of the second partition plate, and effectively separates the oil component by centrifugation. The centrifugally separated oil component is caught by the inner surface of the side wall of the closed container or the first partition plate, flows down along them, and flows to the second partition plate. Since the second partition plate has a conical shape, the flowing-down oil component can be successively guided to the oil storage chamber without stagnation on the second partition plate.

[0010] In the blow-by gas-liquid separation apparatus of the present invention configured as described above, the straightening plate extending in the circumferential direction on the blow-by gas blowing direction side as described above is provided above the opening of the blow-by gas introduction pipe. Is desirably provided. It is desirable that the current plate is provided so as to extend in the circumferential direction from the opening so as to cover at least the opening in the blow-by gas blowing direction. The flow plate regulates the flow of the blow-by gas, so that a swirling flow can be obtained more smoothly. The length of the straightening plate extending in the circumferential direction is not particularly limited as the present invention, but it is set so that the straightening effect is effectively obtained, and is set to a length that does not impair the gas rising force. desirable. The current plate may be formed of a horizontal plate, or may have a shape inclined in a circumferential direction or a radial direction.

Preferably, the blow-by gas introduction pipe is inserted so as to be in contact with the upper side of the slope of the second partition plate.
Thereby, the blow-by gas flows along the upper surface of the second partition plate, smoothly turns, and rises. Further, it is desirable that the current plate is fixedly provided on the inner surface of the side wall of the closed container and the upper side of the slope of the second partition plate. Thereby, the blow-by gas flows along the inner surface of the side wall of the closed container and the upper surface of the second partition plate, and rises while forming a larger swirling flow. Further, it is desirable to provide a ventilation portion at the center of the first partition plate, and to provide an oil passage portion at the outer peripheral edge of the first partition plate and the second partition plate. This prevents the centrifugally separated oil and the blow-by gas from which the oil has been separated from coming into contact again to minimize the formation of mist, and also allows the oil flowing along the inclined surface of the partition plate to easily pass downward. The blow-up gas and the mist formation can be prevented as much as possible.

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to FIGS. The same components as those of the blow-by gas-liquid separator of FIG. 4 described above are denoted by the same reference numerals, and description thereof will be omitted or simplified.

The gas-liquid separation device for blow-by gas according to this embodiment includes a cylindrical closed container 1 having a top plate 1a and a bottom plate 1b. In the present invention, the closed container 1 may have a cylindrical shape. In this embodiment, the closed container 1 has a cylindrical shape, which is a typical form of the closed container. A blow-by gas introduction pipe 4 for introducing blow-by gas 3 from an engine into the closed container 1 is inserted into the lower side surface 2 of the closed container 1. The blow-by gas introduction pipe 4 is inserted from the tangential direction of the closed vessel 1, and the tip of the pipe is cut obliquely, so that the opening 5 (FIG. 2) formed into an ellipse and the inner surface of the side wall of the closed vessel 1. It is made to face. Therefore, the blow-by gas 3 introduced through the blow-by gas introduction pipe 4 flows along the inner surface of the side wall of the closed casing 1. The blow-by gas introduction pipe 4
Need only be arranged along the tangential direction of the closed container in the vicinity of the opening, and it is necessary that all of the introduction pipes 4 including the outside of the closed container be along the tangential direction of the closed container. It is not something to be done.

An exhaust pipe 7 for discharging the blow-by gas introduced into the closed container 1 is inserted from substantially the center of the bottom plate 1b so as to be concentric with the closed container 1, and has an opening at the upper end. 6 faces the upper part in the closed container 1. An umbrella body 8 formed by winding the upper end of the exhaust pipe 7 so as to be folded outward is provided around the opening 6.
Further, the lower end of the exhaust pipe 7 forms a discharge portion 9 which is located outside the bottom plate portion 1b and opens, and is provided with an air cleaner (not shown).
Alternatively, it can communicate with the outside air.

Inside the sealed container 1 into which the blow-by gas introduction pipe 4 and the exhaust pipe 7 are introduced, a first partition plate 12 and a second partition plate 21 each having a conical shape are provided in two vertical stages and spaced from each other. It is provided open. The upper first partition plate 12 is fixed to each other so that the center line of the cone coincides with the center line of the closed container 1, and the upper end of the exhaust pipe 7 passes through the top of the cone. Further, the lower end edge 12 a of the cone of the partition plate 12 is fixed so as to be in contact with the inner surface of the side wall of the closed container 1. The lower edge 12a of the cone is located above the position of the opening 5 of the blow-by gas introduction pipe 4. Therefore, this first partition plate 12 is
The inside of the opening 5 of the blow-by gas introduction pipe 4 and the exhaust pipe 7
And the opening 6 side.

The lower second partition plate 21 is also formed such that the center line of the cone coincides with the center line of the sealed container 1, and the top of the cone is fixed to each other through the middle portion of the exhaust pipe 7. I have. Further, the conical lower end edge 21 a of the partition plate 21 is fixed so as to contact the inner surface of the side wall of the closed container 1. The lower end edge 21a of the cone is located below the position of the opening 5 of the blow-by gas introduction pipe 4, and the upper side of the slope 21b is substantially in contact with the lower outer wall of the blow-by gas introduction pipe 4. Therefore, the second partition plate 21 allows the inside of the closed container 1 to be connected to the opening 5 side of the blow-by gas introduction pipe 4
It is partitioned on the bottom side of the sealed container 1, that is, on the oil storage chamber 17 side.

Also, the slope 12b of the first partition plate 12
One gas passage 13 is formed near the apex of the cone, that is, in the center, as a vent, so that the blow-by gas 3 passing through the gas passage 13 can flow to the opening 6 side of the exhaust pipe 7. ing. A plurality (four in the figure, shown) of oil dropping holes 14 are formed at the outer peripheral end at substantially equal intervals in the circumferential direction as an oil passage portion.
The upper part of the slope 12b of the partition plate 12 or the first partition plate 12
The oil adhering to the inner surface of the upper sealed container 1 can flow down through the oil drop hole 14.

On the other hand, the second partition plate 21 has a plurality of (four in the figure, illustrated) oil drop holes 22 formed at substantially equal intervals in the circumferential direction as an oil passage portion at the outer peripheral end. Oil attached to the upper side of the slope 21b of the second partition plate 21 and the lower side of the slope 12b of the first partition plate 12, or to the inner surface of the sealed container 1 between the first partition plate 12 and the second partition plate 21. The dropped oil can flow down to the oil storage chamber 17 through the oil drop hole 22.

Thus, the lower portion of the closed container 1 is
b and the oil storage chamber 1 partitioned by the second partition plate 21
7 is set. An oil return pipe 20 is connected to the bottom plate 1b downward and connected to an oil pan (not shown) so that the oil in the oil storage chamber 17 can be returned. A check valve is normally provided in the pipeline connected to the oil pan in order to prevent the oil pan from blowing back during operation of the engine.

Further, a straightening plate 23 is provided in the opening 5 of the blow-by gas introduction pipe 4 so as to cover the upper side thereof. The current plate 23 has a substantially planar fan shape,
Is provided so as to extend in the circumferential direction beyond the opening 5,
The outer peripheral side edge is fixed to the inner surface of the side wall of the closed casing 1, and the inner peripheral side edge is fixed and fixed above the inclined surface 21 b of the second partition plate 21.

Next, the operation of the gas-liquid separation device for blow-by gas of this embodiment configured as described above will be described.

As shown in FIGS. 1 and 2, the blow-by gas 3 introduced into the closed vessel 1 from the tangential direction through the blow-by gas introduction pipe 4
Is located on the lower side of the closed vessel 1, the opening 6 of the exhaust pipe 7 is located on the upper side of the closed vessel 1, and the opening 5 of the blow-by gas introduction pipe 4 is located on the closed vessel 1. The blow-by gas flows along the inner surface of the side wall and the inclined surface of the first partition plate 21, and the closed container 1 is swirled around the exhaust pipe 7 as the center of swirling. It flows through the inside from the bottom to the top as shown by the arrow. At this time, the flow path area is gradually narrowed by the slope of the first partition plate 12, so that a nozzle function is formed, and the swirling flow rate of the blow-by gas 3 increases from the lower side to the upper side. Therefore, not only when the initial speed of the blow-by gas 3 introduced into the closed container 1 is high, but also
Even in the case of a slow speed, the swirl flow velocity required for centrifugal separation of the oil component can be reliably formed, and the oil component contained in the blow-by gas can be efficiently separated.

In particular, the opening 5 of the blow-by gas introduction pipe 4
Rectifying plate 2 extending in the circumferential direction beyond opening 5
Since the blow-by gas 3 is provided, the blow-by gas 3 that has passed through the opening 5 is prevented from diffusing upward. Further, since the opening 5 of the blow-by gas introduction pipe 4 is inserted so as to be in contact with the upper side of the slope 21 b of the second partition plate 21, the blow-by gas 3 passing through the opening 5 is located on the lower side and in the left and right lateral directions. Has been prevented from spreading. As a result, the blow-by gas 3 becomes a strong swirling flow in a laminar flow state without forming a turbulent flow in the vicinity of the opening 5, and can rise inside the sealed container 1. Therefore, the efficiency of centrifugal separation of the oil component can be further increased, and the oil component contained in the blow-by gas 3 can be almost completely separated.

The centrifuged oil component is placed in a closed container 1
Along the inner surface of the side wall and the upper side of the slope 12b of the first partition plate 12, the oil drop hole 14 and the lower side of the slope 12b.
It flows to the slope 21 b of the partition plate 21, and finally flows down to the oil storage chamber 17 through an oil drop hole 22 formed at the outer peripheral end of the second partition plate 21 and is stored. Since the second partition plate 21 has a conical shape, the slope 21 b
The oil component flowing to the second partition plate 21 does not stay on the slope 21 b of the second partition plate 21, but the oil drop hole 22
Through to the oil storage chamber 17,
The problem that oil drop is bad can be improved. Further, even when the engine is tilted, it is possible to maintain a good state of oil drop.

In the gas-liquid separation device for blow-by gas shown in FIG. 4, a partition plate 15 is further provided above the partition plate 12. Then, the blow-by gas 3 is caused to pass through the gas passages 16 formed of small holes formed in the partition plate 15 so that the blow-by gas 3 contracts at that time.
Oil components were separated by diffusion. However, in the blow-by gas-liquid separation device according to this embodiment, the centrifugal separation efficiency of the oil component is improved by reliably forming the swirling flow by the conical second partition plate 21 as described above. The partition plate 15 is not required.

The opening 5 of the blow-by gas introduction pipe 4
The outer peripheral edge of the rectifying plate 23 is fixed to the inner surface of the side wall of the closed casing 1, and the inner peripheral edge is fixed to the slope 21 b of the second partition plate 21. For this reason, the installation state of the rectifying plate 23 can be made firm, and it can be prevented that the rectifying plate 23 vibrates, deforms, or falls off due to the vibration of the engine or the pulsation of the blow-by gas 3, and the function of the rectifying plate 23 is reliably performed. Can be maintained.

[0027]

As described above, according to the present invention,
A cylindrical closed container, a blow-by gas introduction pipe inserted tangentially into a lower side surface of the closed container, an exhaust pipe having an opening at an upper part in the closed container, and a blow-by gas introduction through the closed container. A first conical partitioning plate partitioning between the opening side of the pipe and the opening side of the exhaust pipe, a vent provided in the first partitioning plate, and an opening of the blow-by gas introduction pipe in the closed container; And the conical second partition plate that partitions the bottom side of the closed container into the closed side, so that the blow-by gas blown out in the closed container rises while smoothly turning on the conical partition plate. As a result, a sufficient swirling flow is generated, so that the oil centrifugal separation performance is improved. Also,
Since the centrifugally separated oil component of the blow-by gas is received on the slope of the conical partition plate so as not to be retained, it is possible to provide a gas-liquid separation device for the blow-by gas in which the oil drop into the oil storage chamber is improved.

According to the second aspect of the present invention, since the straightening plate extending in the circumferential direction beyond the opening is provided above the opening of the blow-by gas introduction pipe, the blow-by gas can be prevented from diffusing upward. It is effective in enhancing swirling flow.

According to the third aspect of the present invention, since the blow-by gas introduction pipe is provided so as to be in contact with the upper side of the slope of the second partition plate, it is possible to prevent the blow-by gas from diffusing in the lower side and the left and right lateral directions. It is effective in enhancing swirling flow.

According to the fourth aspect of the present invention, the current plate is fixed to the inner surface of the side wall of the closed container and the upper side of the slope of the second partition plate. Has the effect of reliably maintaining

According to the fifth aspect of the present invention, the ventilation portion is provided at the center of the first partition plate, and the oil passage portion is provided at the outer peripheral edges of the first partition plate and the second partition plate. This has the effect of minimizing the contact between the component and the oil and the blow-by gas, which has separated the oil, and preventing the separated oil component from becoming mist and blowing up.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view of a gas-liquid separation device for blow-by gas according to an embodiment of the present invention.

FIG. 2 is a cross-sectional view taken along the line II-II of FIG.

FIG. 3 is a cross-sectional view taken along the line III-III of FIG.

FIG. 4 is a longitudinal sectional view of a conventional gas-liquid separation device for blow-by gas.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Closed container 2 Lower side surface of closed container 3 Blow-by gas 4 Blow-by gas introduction pipe 5 Opening of blow-by gas introduction pipe 6 Opening of exhaust pipe 7 Exhaust pipe 12 First partition plate 12b Slope of first partition plate 14 Oil drop hole 21 Second Partition Plate 21b Slope of Second Partition Plate 22 Oil Drop Hole 23 Rectifier Plate

 ──────────────────────────────────────────────────続 き Continued on the front page F term (reference) 3G015 BD09 BD10 BE05 BE11 BF05 BF08 DA01 EA27 4D031 AA01 AB03 AB10 AB26 AC04 BA07 EA01

Claims (5)

[Claims] 1. A cylindrical airtight container, a blow-by gas introduction pipe inserted tangentially into a lower side surface of the airtight container, and an exhaust pipe having an opening in an upper part of the airtight container.
A conical first partition plate for partitioning the inside of the closed container into an opening side of the blow-by gas introduction pipe and an opening side of the exhaust pipe, a vent provided on the first partition plate, A gas-liquid separation device for blow-by gas, comprising: a second conical partitioning plate for partitioning the inside into the opening side of the blow-by gas introduction pipe and the bottom side of the sealed container. 2. The gas-liquid separation of blow-by gas according to claim 1, wherein a straightening plate extending in the circumferential direction on the blow-by gas blowing direction side is provided above the opening of the blow-by gas introduction pipe. apparatus. 3. The blow-by gas-liquid separation device according to claim 1, wherein the blow-by gas introduction pipe is inserted so as to be in contact with the upper side of the slope of the second partition plate. 4. The current plate is provided between the inner surface of the side wall of the closed container and the second side.
The gas-liquid separation device for blow-by gas according to claim 2 or 3, wherein the gas-liquid separation device is fixed to the upper side of the slope of the partition plate. 5. A first partition plate, wherein a ventilation portion is provided at a center portion, and an oil passage portion is provided at outer peripheral edges of the first partition plate and the second partition plate.
5. The gas-liquid separation device for blow-by gas according to any one of claims 4 to 4.