JPH0772493B2 - Gas-liquid separation device - Google Patents

Description

TECHNICAL FIELD The present invention relates to a gas-liquid separation device for separating air and oil particles.

[Conventional technology]

An example of the oil separator provided in the blow-by gas passage is described in JP-A-59-206610. In this example, a large number of baffle plates are placed in the blow-by gas passage, and the flow is bent to separate the relatively large oil particles contained in the blow-by gas from the blow-by gas by inertial force and attach them to the baffle plate and vessel wall. Relatively small oil particles in the blow-by gas that have been captured and then passed therethrough are captured by a reticulated oil strainer provided in the subsequent stage.

[Problems to be Solved by the Invention]

As in the prior art, in the case where a filtering means such as an oil strainer or a filter is provided to capture small oil particles (oil mist), the filtering means causes clogging due to contaminants or oil deposits. So
There is a problem that the resistance of the flow gradually increases and the pressure loss increases, and that the oil once captured is again atomized on the flow of the blow-by gas. Therefore, the elements of the filtration means need to be replaced with clean ones from time to time.

The present invention provides a maintenance-free gas-liquid separator capable of separating almost completely oil particles contained in an air flow from large particles to small particles without using a filtering means. It is a problem to be solved by the invention.

[Means for Solving the Problems]

The gas-liquid separation device of the present invention, a liquid oil separator and a mist oil separator are provided in series on the downstream side in the middle of a passage for guiding air containing oil, and the liquid oil separator is a cylindrical casing. On the other hand, an air inlet for opening the air to be treated tangentially, an air outlet for opening the air above the center toward the mist oil separator, and draining drain oil to the bottom. And a drain oil passage, wherein the mist oil separator is a cylindrical casing having a relatively small diameter above the liquid oil separator, and the cylindrical casing connected to the air outlet of the liquid oil separator from below. Air inflow passage protruding into the interior of the casing, an annular groove formed around the air inflow passage, and an empty space opening above the casing. And an outflow passage, and having a drain oil passage which opens into the annular groove.

[Action]

When the air containing the oil component is pressurized or suctioned and flows tangentially into the cylindrical casing from the air inlet of the liquid oil separator, a swirling flow is generated along the inner wall of the casing. , Large oil particles are separated from the air flow by centrifugal force, adhere to the contact surface such as the inner wall of the casing, aggregate and grow into an oil film,
Further merged and discharged from the lower drain oil passage.

The air coming out of the air outlet of the liquid oil separator still contains a small amount of mist-like oil, but this time it swirls from below the mist oil separator to a relatively thin air inflow passage protruding into the inside of the cylindrical casing. While flowing in. Then, fine oil particles are also separated by centrifugal force and adhere to the inner surface of the air inflow passage to form an oil film. When the air flows out from the end of the air inflow passage into the cylindrical casing of the mist oil separator, the diameter of the passage abruptly expands and a low-pressure adhering vortex is generated toward the inner wall of the casing, and the inner surface of the air inflow passage is formed. The oil that has adhered in the form of an oil film wraps around the outside of the air inflow passage, flows down to the surrounding annular groove, and is discharged from the drain oil passage that opens there.

〔Example〕

Referring to FIG. 1, an air compressor 1 having an air inlet 12, an outlet 13, and an oil inlet 11 and an air injection valve 6 are connected via a discharge passage 2 communicating with the outlet 13. ing. A liquid oil separator 3 having drain oil passages 332 and 44 in the middle of the discharge passage 2, respectively.
A mist oil separator 4 is provided, and a pressure regulator 5 having a relief air passage 51 is provided downstream thereof.

Referring to FIG. 2, the liquid oil separator 3 has a first
First compartment 32 and second compartment having an oil separator 31
A second oil separation device 34 and a partition plate 35 are provided between the two compartments, and are screwed coaxially with each other.

The casing 321 of the first compartment 32 has a cylindrical shape, a compressed air inlet 322 opens tangentially in the upper part of the cylinder, and a compressed air outlet 323 opens in the center of the upper surface of the casing 321 and is coaxial therewith. The first oil separating device 31 is screwed to. The first oil separation device 31 includes a guide 311 and a plurality of blades 312. The guide 311 has a cylindrical shape whose lower portion opens like a trumpet, and a blade 312 is attached to the outer wall of the guide 311 at a predetermined angle with respect to the swirling direction of air.

The casing 331 of the second compartment 33 has a cylindrical shape, and the oil level sensor 7 and the electromagnetic opening / closing valve 8 are attached to the bottom surface of the casing 331, and the oil drain passage 332 is opened.

The second oil separating device 34 includes a guide 341 and a plurality of blades 3.
It consists of 42. The guide 341 has a cylindrical shape whose inner diameter is the same as the inner diameter of the casing 321 of the first compartment 32, and the blade 342 is attached to the inner wall of the guide 341 at a predetermined angle with respect to the swirling direction of air. The partition plate 35 has a tapered shape that narrows downward and has a hole at the center.

A mist oil separator 4 is composed of a compressed air inflow passage 41, a cylindrical casing 42 coaxial with the passage 41, a compressed air outflow passage 45, and a drain oil passage 44, and the inflow passage 41 is a liquid oil separator 3 Is screwed to the liquid oil separator 3 so as to communicate coaxially with the compressed air outlet 323. The inflow passage 41 is a cylindrical casing.
The inner wall of 42 projects upward from the lowermost end of the inner wall, and the projection of the inflow passage 41 and the cylindrical casing 42 form an annular groove 43.
The drain oil passage 44 has an annular groove so that it has the same tangential direction as the swirling flow of air generated in the liquid oil separator 3.
It opens at 43.

As shown in FIG. 1, the compressed air discharged from the air compressor 1 is controlled to a predetermined pressure by the pressure regulator 5,
It is injected by the air injection valve 6. The air compressor 1 is filled with 20 to 500 cc of oil per minute for the purpose of preventing seizure of the sliding portion, improving the sealing property, and cooling the compressed air. The injected oil is discharged together with the compressed air.

Referring to FIG. 2, the oil and the compressed air flow into the liquid oil separator 3 and swirl through the space formed by the guide 311 of the first oil separating device 31 and the inner wall of the casing 321, and then the mounting angle of the blades 312 is increased. It will flow downwards along. After that, the oil is shaken off to the outside by the trumpet portion of the guide 311, falls while swirling the inner wall of the casing 321, and flows into the second compartment 33 through the holes of the second oil separation device 34 and the partition plate 35. The second oil separation device 34 prevents the oil flowing through the partition plate 35 from being scattered and mixed again by the swirling flow of air and flowing out from the outflow port 323. Second
In the compartment 33, the level sensor 7 detects the level of the accumulated oil, and when the level exceeds a predetermined value, the control circuit 9 opens the electromagnetic opening / closing valve 8 to drain only the oil. In this way, the liquid component of the oil flowing into the separator is separated.

Next, the air containing the oil mist flows from the outside of the guide 311 to the inside, and flows into the mist oil separator 4 while swirling the inner wall of the guide 311. During this time, the oil mist component is made into a liquid film by the inertial force in the inner wall of the guide 311 and the inflow passage 41 of the mist oil separator 4. Then, when the liquefied oil and air flow out from the projecting portion of the inflow passage 41, a low pressure adhering vortex is generated toward the inner wall of the casing 42 due to the abrupt expansion of the passage, and the liquefied oil becomes the annular groove 43. Trapped in. The oil swirls in the annular groove 43 and is smoothly discharged from the oil drain passage 44 opening in the same tangential direction as the swirling direction. In this way, the oil in the compressed air is removed and collected, and clean air is injected from the air injection valve 6.

Next, specific applications of the present invention will be described. FIG. 3 is an example in which the present invention is applied to an air blast type fuel injection system for an internal combustion engine. A part of the air taken into the engine is pressurized by the air compressor 1. A part of the compressed air is relieved in the crankcase by the pressure regulator 5, and the compressed air line 2 is maintained at, for example, 3 kg / cm ² . The fuel is once opened from the fuel injection valve 10 to the compressed air line 2, and simultaneously with the opening of the air blast valve (air injection valve) 6, it is injected into the fuel chamber of the engine together with the compressed air. When the liquid oil separator 3 and the mist oil separator 4 of the present invention are provided in the compressed air line 2, problems such as an increase in oil consumption and deposit accumulation on the air blast valve can be prevented.

FIG. 4 shows an example of the effect of the oil separator of the present invention. According to the experiment on the embodiment shown in FIG. 3, the liquid outflow amount of the liquid oil separator of the present invention is reduced to 70/1 as compared with the generally used cyclone type, and when the mist oil separator is further installed. The result was reduced to 7,000 / 1.

Next, the second oil separation device 34 shown in FIG. 2 may be the one shown in FIG. The structure is composed of a plate 36 having a diameter larger than the diameter of the drain port opened at the center of the partition plate 35, and an adapter 37 for fixing the plate 36.

The compressed air that has passed through the first oil separation device 31 heads downward while swirling, and then heads upward after reaching the partition plate 35. At this time, the partition plate 35 separated by the first oil separation device 31
The oil flowing down is rolled up in a swirling flow from the vicinity of the center of the partition plate 35, and even if it tries to mix into the compressed air again, it is blocked by the plate 36. Further, the partition plate 35 is abolished and the plate 36 is supported by the bottom wall of the chamber as shown in FIG. 6, or the partition plate 35 is provided in FIGS. 7 (a) and 7 (b).
As shown in, a flat plate shape having an opening at a position along the peripheral wall may be used.

Further, the configurations of the liquid oil separator 3, the mist oil separator 4, and the pressure regulator 5 may be as shown below.

When the amount of oil contained in the compressed air is relatively small, not the solenoid valve 8 but the pressure regulator 5 is configured in the drain passage 332 of the liquid oil separator 3 to relieve the air together with the oil. Adjust the air pressure. (FIG. 8) When the amount of oil contained in compressed air is large, two liquid oil separators 3 and one mist oil separator 4 may be connected in series. (FIG. 9) In order to drain the drain oil accumulated in the lower portion of the casing 321 of the liquid oil separator 3, a float valve 81 that opens and closes automatically may be provided instead of the electromagnetic opening / closing valve 8 in FIG. (FIG. 10) The present invention is not limited to the above-mentioned embodiment,
It goes without saying that it can be applied to a blowby gas reduction device.

〔The invention's effect〕

The present invention has the following effects due to the above configuration and operation.

1. Oil consumption can be reduced.

2. Since no oil enters the pressure regulator, the pressure control error is small.

3. Since the clean air can be obtained without using a filtering means such as a filter, the following advantages can be obtained.

There is no need to replace the element and it is maintenance-free.

Even if the deteriorated oil is used, there is no concern that the filter element will be clogged with the deposit, so that the service life of the oil is extended.

[Brief description of drawings]

FIG. 1 is a sectional view showing an outline of an air supply system for an air injection valve utilizing one embodiment of the present invention, and FIG. 2 is a detailed sectional view of an embodiment of the present invention which is a main part of FIG. FIG. 3 is an overall configuration diagram of an internal combustion engine having the air supply system of FIG. 1, FIG. 4 is a diagram showing effects of the embodiment of the present invention, and FIGS. 5 and 6 are liquid oil separators, respectively. FIG. 7 shows another embodiment of the liquid oil separator, FIG. 7A is a longitudinal sectional view, FIG. 7B is a plan view of a main part,
8 and 9 are schematic views showing another embodiment of the present invention, and FIG. 10 is a sectional view showing the other embodiment. 3 ... Liquid oil separator, 4 ... Mist oil separator, 5 ... Pressure regulator, 41 ... (Compressed) air inflow passage, 43 ... Annular groove, 44 ... Drain oil passage, 311 ...
… Guides, 312 …… blades, 322 …… (compressed) air inlet,
332 …… Drain oil passage, 321 …… Cylinder type casing, 323 …… (Compressed) air outlet, 331 …… Cylinder type casing.

Claims (1)

[Claims] 1. A liquid oil separator and a mist oil separator are provided in series in the middle of a passage for introducing air containing oil, and the liquid oil separator is a cylindrical casing and a liquid is treated therein. Air inlet opening to allow tangential air to flow, an air outlet opening for air toward the mist oil separator, opening above the center, and a drain oil passage for leading drain oil to the lower portion. The mist oil separator has a relatively small-diameter cylindrical casing above the liquid oil separator and the air outlet of the liquid oil separator, and the mist oil separator protrudes into the cylindrical casing from below. An air inflow passage, an annular groove formed around the air inflow passage, and an air outflow passage open above the casing. Gas-liquid separation device characterized by having a drain oil passage which opens into the annular groove.