CN101122249A

CN101122249A - Oil mist separator

Info

Publication number: CN101122249A
Application number: CNA2007101085280A
Authority: CN
Inventors: 武舍信一; 伊藤大藏
Original assignee: Mahle Filter Systems Japan Corp
Current assignee: Mahle Filter Systems Japan Corp
Priority date: 2006-06-23
Filing date: 2007-05-31
Publication date: 2008-02-13
Anticipated expiration: 2027-05-31
Also published as: EP1870571B1; JP2008002377A; DE602007000998D1; JP4690257B2; EP1870571A2; EP1870571A3; CN101122249B

Abstract

An oil mist separator formed inside a cylinder head cover of an engine. The oil mist separator includes a passage wall defining a blow-by gas passage, the passage wall including a passage bottom wall. An impact wall is disposed in the blow-by gas passage. A partition wall is disposed in the blow-by gas passage on an upstream side of the impact wall with respect to flow of blow-by gas to divide the blow-by gas passage, the partition wall being formed with a slit which extends to the passage bottom wall. First and second screening plates are disposed respectively on upstream and downstream sides of the partition wall so as to screen a lower part of the slit from flowing of blow-by gas, an upper part of the slit serving as a restriction passage through which blow-by gas passes to impact against the impact wall.

Description

Oil mist separator

Technical field

The present invention relates to a kind of oil mist separator that contained mist of oil (oil) in the internal-combustion engine gas leakage (Block ロ one バイガス) is separated, reclaims.

Background technique

In the past, in the internal-combustion engine of being installed on automobile, its structure was, made from the gap of piston ring and cylinder wall etc. to leak into gas leakage the crankcase, turned back in the suction system by cylinder head and valve mechanism cover, in mixed gas is admitted to the firing chamber.Turn back in the suction system in order to make this gas leakage can not carry mist of oil secretly, oil mist separator will be set, to separate, to be recovered in mist of oil contained in the gas leakage.

An example as this kind oil mist separator, in the so-called ballistic separator described in patent documentation 1, connect on the riser in being arranged at leakage path and form a plurality of holes as throttling passage, high speed gas leakage by these throttling passages impacts on the impingement wall in downstream, thereby mist of oil is separated attached to realizing on the impingement wall.

Patent documentation 1 spy opens flat 9-96209

Summary of the invention

In this kind impact type oil mist separator,, be necessary to improve gas flow rate by throttling passage in order to improve the supplementary rate of oil.But, as shown in Figure 12, erect on the passage diapire 3A by gas leakage passage 3 and be provided with, form the riser 2 of throttling passage 4 in impingement wall 1 upstream, between the inner face of the edge of this riser 2 and gas leakage passage 3, form the gap, the front and back in crack are provided with rib 5 during this time, thereby form the clearance channel 6 of labyrinth-like, in this structure,, will reduce the channel cross-sectional area of throttling passage 4 in order to improve gas leakage flow velocity by throttling passage 4 to improve the supplementary rate of oil, its resistance is strengthened, by riser 2 marginal gap passages 6, the ratio that gas leakage flows to the downstream increases, and can't improve the flow velocity in throttling passage 4 effectively.And when the gap of riser 2 edges and gas leakage passage 3 inner faces was stopped up fully, the flow velocity in the throttling passage 4 was improved, but had produced the new problem that oily meeting is trapped in riser 2 upstreams simultaneously.

Above-mentioned impingement wall 1, riser 2 or rib 5 can form when constituting the valve mechanism cover moulding of passage upper wall or channel side wall simultaneously, and the throttling passage 4 of perforation riser 2, because being subjected to the restriction of hole shape can not form when moulding simultaneously, must form in addition by back processing, the number in man-hour that has increased processing has also improved cost.

The present invention finishes in view of the above-mentioned problems.In other words, primary invention of the present invention is, make gas leakage pass through throttling passage, impact mutually with the impingement wall on being arranged on the gas leakage passage, isolate the oil mist separator of mist of oil thus, it is characterized in that, be provided with the spacing wall of separating the gas leakage passage in the upstream of above-mentioned impingement wall, upstream and downstream in above-mentioned spacing wall is provided with a pair of shield, connect on the feasible next door during this time and be formed with the slit that extends to gas leakage passage diapire, and cover the bottom of this slit, and, form above-mentioned throttling passage on the top of above-mentioned slit.

Like this, since by spacing wall cut off effectively, the inaccessible channel cross-section of gas leakage passage, formed slit on the next door during this time, particularly except the slit bottom that the shield by front and back has covered, the gas leakage that the throttling passage that forms on slit top passes through, its flow and flow velocity all increase significantly, thereby can improve oily supplementary rate significantly.And, because slit extends on the passage diapire of gas leakage passage, be spaced apart the fluid oil that wall is trapped on the upstream passageway diapire and exist even have, also can be discharged into the downstream by the bottom of slit.That is, when slit played the throttling passage effect at an upper portion thereof, its underpart played a part oily discharge route, compare with the situation of independent formation, and is simple in structure and reduced the number in man-hour of processing.

Particularly, be provided with the stepped part of stretching out downstream by top in above-mentioned spacing wall, can form the rectification passage that above-mentioned throttling passage links to each other with the downstream below this stepped part and between above the shield of downstream, become the simple structure of the shield that utilizes spacing wall or downstream, improve rectification effect, can further improve oily supplementary rate simultaneously.

This kind oil mist separator can be by constituting such as the baffle plate of fixing by modes such as vibration welding in valve mechanism cover and the inside thereof and by formed in mould two parts of synthetic resin material.Particularly, in the passage upper wall that constitutes the gas leakage passage and the valve mechanism cover inboard of channel side wall, erect from passage upper wall integral body and to be provided with spacing wall and impingement wall, integral body erects and shield is set also is fine on the baffle plate that constitutes the passage diapire.In addition, by spacing wall and passage upper wall and channel side wall are linked into an integrated entity, and make the lower edge of this spacing wall very close to each other in fact near the passage diapire, just can prevent gas leakage effectively by flowing to the downstream around the spacing wall, feasible gas leakage by spacing wall can concentrate in the throttling passage on slit top more.In addition, because an end of the lower edge open slots in next door during this time makes this slit can carry out moulding in the forming cylinder housing, can further cut down manufacture cost.

Another invention of the present invention is, gas leakage by throttling passage is impacted mutually with the impingement wall on being arranged on the gas leakage passage, thereby isolate the oil mist separator of mist of oil, it is characterized in that, be provided with the spacing wall of separating the gas leakage passage in the upstream of above-mentioned impingement wall, connect to form the slit that always extends to gas leakage passage diapire during this time on the next door, and erect from the diapire of above-mentioned gas leakage passage projection is set, be embedded in the bottom of this slit.Thus, because spacing wall has been cut off with obturation the channel cross-section of gas leakage passage in fact, the slit that forms on the next door during this time, particularly except projection the chimeric slit bottom, by gas leakage at the formed throttling passage in slit top, its flow and flow velocity all increase significantly, thereby can improve oily supplementary rate significantly.

According to aforesaid the present invention, can provide a kind of simple in structure and oily supplementary rate is good, can guarantee the oil mist separator of the discharge route of oil simultaneously.

Description of drawings

Fig. 1 represents the sectional view of first embodiment's of the present invention oil mist separator;

The oil subsidy of Fig. 2 presentation graphs 1 fills the amplification sectional view of part;

Fig. 3 is along the sectional view of the B-B line of Fig. 2;

Fig. 4 is the sectional view along the C-C line of Fig. 2;

Fig. 5 is the sectional view along the D-D line of Fig. 2;

Fig. 6 is the explanatory drawing that the oil subsidy of exploded representation Fig. 2 fills part;

Fig. 7 is the corresponding sectional view in C-C cross section of second embodiment of the present invention and Fig. 2;

Fig. 8 is that the 3rd embodiment's of the present invention amplification represents that the oil subsidy of oil mist separator fills the sectional view of part;

Fig. 9 is the sectional view along the E-E line of Fig. 8;

Figure 10 is the explanatory drawing that the oil subsidy of exploded representation Fig. 8 fills part;

Figure 11 is the explanatory drawing that exploded representation the 4th embodiment's of the present invention oil mist separator oil subsidy fills part;

Figure 12 is the sectional view that expression is used to illustrate the oil mist separator of problem of the present invention.

Symbol description

10 oil mist separators

11 gas leakage passages

12 passage diapires

13 passage upper walls

14 channel side walls

21 impingement wall

22 spacing wall

23 slits

The 23A throttling passage

24 upstream shields

25 downstream shields

42,43 projections

Embodiment

Most preferred embodiment of the present invention is described with reference to the accompanying drawings.Fig. 1～Fig. 6 represents first embodiment's of the present invention oil mist separator 10.Constituting of this oil mist separator 10, form the gas leakage passage 11 that roughly is horizontal quadrilateral box shape in inside, the gas leakage that in internal-combustion engine, produces, impact on the impingement wall 21 by throttling passage 23A, from gas leakage, separate thus, reclaim mist of oil, be so-called ballistic separator.

This oil mist separator 10, structurally by the valve mechanism cover 30 that covers the cylinder head top that does not show among the figure, the baffle plate 31 etc. that is fixed on these valve mechanism cover 30 inboards by the vibration welding joint is made of two parts of synthetic resin forming materials, be formed with in the inboard of valve mechanism cover 30 passage upper wall 13 and thus passage upper wall 13 below Fig. 1, erect the square channel side wall 14 that is provided with, form gas leakage passage 11 thus.Front end at this channel side wall 14 is fixed with baffle plate 31, like this, constitutes the passage diapire 12 of gas leakage passage 11.

Gas leakage in the cylinder head, the gas leakage inlet 15 that forms the opening formation by the upstream at passage diapire 12 is imported in the gas leakage passage 11, the mist of oil that is separated by the oil separation part of narrating below 20, the tubular oil exhaust port 17 that forms from the downstream of passage diapire 12 turns back in the cylinder head, the gas leakage outlet 16 that forms by downstream at the clean air that does not contain mist of oil that carries out after mist of oil separates in addition at passage upper wall 13, and supply in the suction system.

Fig. 2 is the sectional view at the above-mentioned oil separation part of expression 20 main positions.On passage upper wall 13, be integrally formed therewith rectangular plate shape impingement wall 21 towards Fig. 2 below, in the upstream (left side of Fig. 1) of this impingement wall 21, be formed with upright roughly rectangular tabular spacing wall 22 downwards.This spacing wall 22 is divided into the upstream chamber 11A that comprises gas leakage inlet 15 to gas leakage passage 11 and comprises the 11B of downstream chamber of gas leakage outlet 16, and the channel cross-section of gas leakage passage 11 is sealed effectively.Promptly, spacing wall 22 is shaped as a whole with valve mechanism cover 30, its top edge is connected as a whole with passage upper wall 13 with channel side wall 14 respectively with two side margin, and its lower limb and passage diapire 12 near to or in contact with, very close to each other in fact, its height is identical or short slightly with channel side wall 14.That is to say that the periphery of spacing wall 22 is connected with the inner wall surface of gas leakage passage 11 or to be close to configuration almost very close to each other.And, on the next door 22, form the slit 23 of two perforations during this time.The equal in length of these two slits 23, be elongated band shape, between the

shield

24,25 that the top of this slit is narrated in the back, play a part above-mentioned throttling passage 23A, its lower end and passage diapire 12 are close to and are very close to each other in fact, and the lower edge of spacing wall 22 is open.That is, slit 23 extends on the passage diapire 12 from throttling passage 23A under installment state illustrated in figures 1 and 2.

On passage diapire 12, uprightly be provided with a pair of upstream shield 24 and downstream shield 25 respectively, and respectively at its upstream and the downstream, clamp the bottom of the spacing wall 22 that forms slit 23.These two

shields

24,25 are all much at one rectangular plates of two tile heights, width and thickness, in the lower parallel ground configuration of the lamellar spacing wall 22 that forms slit 23, with spacing wall respectively across predetermined spacing D1, D2.The width of these two

shields

24,25 is enough wide, the formation scope that will surpass slit 23, make as shown in FIG. 4, observe from the inlet of passage, in slit 23, the throttling passage 23A that forms between

shield

24,25 at an upper portion thereof, its underpart 23B crested promptly covers.That is to say that each

shield

24,25 is provided with to such an extent that liken to the height of the slit 23 of throttling passage 23A is low, observes from the direction of channel entrance, the slit top of exposing above

shield

24,25 plays a part throttling passage 23A.As shown in FIG. 3, the width of each

shield

24,25 is set narrowlyer than the width of gas leakage passage 11 inside, guarantees to form clearance D 3, the D4 that sets between the channel side wall 14 of the side margin of

shield

24,25 and gas leakage passage 11.

Spacing wall 22 is formed with the stepped part 22A that stretches out downstream at an upper portion thereof.This stepped part 22A compares with the lamellar bottom that forms slit 23, and its thickness is thicker, below this stepped part 22A and between above the downstream shield 25, forms the rectification passage 26 that is connecting throttling passage 23A downstream.The height of impingement wall 21, be set at can be relative with throttling passage 23A degree, but between impingement wall 21 and passage diapire 12, guarantee enough clearance D 5, make that not having oil is detained.

According to aforesaid present embodiment, very close to each other in fact between the internal surface of spacing wall 22 surrounding edges and gas leakage passage 11, except slit 23, gas leakage passage 11 is almost completely stopped up, closed to spacing wall 22, and dispose

shield

24,25 in the front and back of slit 23, so the gas leakage by spacing wall 22 can concentrate on slit 23, the part of throttling passage 23A at an upper portion thereof particularly.Thus,, its flow and flow velocity can be improved significantly, thereby the supplementary rate of oil can be improved significantly by the gas leakage of throttling passage 23A.

In addition, because slit 23 extends to passage diapire 12 always, simultaneously also owing to guaranteed clearance D 3, the D4 of

shield

24,25 and both sides, oil on the passage diapire 12, just can pass through slit 23 and clearance D 3, D4, the oily exhaust port 17 that forms by above-mentioned clearance D 5 is discharged to the downstream well again, can be not oily under being detained on the passage diapire 12.That is, slit 23 has concurrently as the function of throttling passage 23A and makes oil flow to the function of the oily discharge route in downstream, need not the two each self-forming.

Have again, can constitute oil mist separator 10 with

valve mechanism cover

30 and 31 two kinds of parts of baffle plate, and when making valve mechanism cover 30 with synthetic resin, except passage upper wall 13 and channel side wall 14, the spacing wall 22 or the impingement wall 21 that erect setting from passage upper wall 13 can be formed simultaneously, gas leakage outlet 16 can also be formed simultaneously or at the upwardly extending slit 23A of upper and lower.Particularly an end of slit 23 is formed on the open nick shaped with certain width in lower end of spacing wall, so can when being shaped, form this slit 23 simultaneously, it is same when the baffle plate 31 to the synthetic resin manufacturing forms, when forming passage diapire 12, can form

shield

24,25, gas leakage inlet 15 and oily exhaust port 17 simultaneously.Therefore can reduce the number in man-hour of processing, manufacture cost has been controlled to lower degree.

And can utilize the simple structure of downstream shield 25 and the spacing wall upper step 22A of portion to form rectification passage 26.And, the gas leakage of mist of oil has improved flow velocity by rectification passage 26 and by rectification, owing to the effect of this rectification, give mist of oil with very big inertial force owing to contain, can impact with the right angle or near the angle at right angle with the impingement wall 21 in downstream, thereby can further improve oily supplementary rate.

In the following description, give same symbol, and suitably omitted the explanation that repeats the same structure division of the embodiment who had narrated.

Second embodiment as shown in FIG. 7, the picture V-type internal combustion engine, because under vehicle-mounted state, passage diapire 12 with respect to the horizontal plane tilts, form oily exhaust port 40 at the spacing wall 22 lower end corners relative with the corner portions located below the passage diapire 12, make it possible to thus the oil on the passage diapire 12 is waltzed through oily exhaust port 40, be discharged to the downstream from the upstream of spacing wall 22.This oil exhaust port 40 is the same with above-mentioned slit 23, forms in the time of can be with valve mechanism cover 30 moulding.

In the 3rd embodiment as shown in Fig. 8～Figure 10, just be with above-mentioned first embodiment's difference, uprightly be provided with a pair of projection 42 integratedly from passage diapire 12 and its formation of gas leakage passage 11, and be stuck on the 23B of slit bottom.It is banded that projection 42 is, and has same height with

shield

24,25, it inserts the upstream portion (left side of Fig. 9) among the slit bottom 23B, be stuck among the 23B of slit bottom in fact very close to each otherly, take the space of slit bottom 23B, the end face of its upstream, be set at spacing wall 22 at the end face of updrift side roughly on same plane, and, be connected as a whole with the shield 25 in downstream in the downstream.That is, the shield 25 in downstream and projection 42 are the geta shape sectional shape of (promptly roughly being one annotation of translation of π font).

According to aforesaid the 3rd embodiment, taken the space of slit bottom 23B by projection 42, just can prevent positively that gas leakage from passing through this slit bottom 23B, gas leakage by spacing wall 22 is concentrated among the throttling passage 23A of slit top formation more, thereby can improve the supplementary rate of oil more.

In the 4th embodiment shown in Figure 11, same with the 3rd embodiment, from the passage diapire 12 of gas leakage passage 11 one uprightly be provided with a pair of projection 43, be stuck on the 23B of slit bottom, and, do not establish shield (24,25) in the front and back of spacing wall 22.In other words, the simple structure of shield (24,25) has been omitted in formation.Projection 43 owing to be stuck on the 23B of slit bottom effectively very close to each otherly, make that along the direction and the spacing wall 22 of gas flow be roughly the same thickness, and setting is identical with the width of slit 23, and this has just taken the space of slit bottom 23B just.

According to the 4th above-mentioned embodiment, same with the 3rd embodiment, owing to taken the space of slit bottom 23B just by projection 43, make it possible to positively prevent that gas leakage from passing through the bottom 23B of this slit, thus, feasible gas leakage by spacing wall 22 concentrates among the formed throttling passage 23A in slit top more, thereby can improve the supplementary rate of oil more.

In above-mentioned third and fourth embodiment, same with above-mentioned second embodiment, corner in spacing wall 22 lower ends relative with corner below the passage diapire 12 forms oily exhaust port 40, can make oil on the passage diapire 12 by oily exhaust port 40 thus, successfully be discharged into its downstream from the upstream of spacing wall 22.This oil exhaust port 40 and above-mentioned slit 23 are same, can form in forming cylinder housing 30.In the above-described embodiments, only represented that the side at spacing wall 22 lower end corners is provided with the situation of oily exhaust port 40, but also can oily exhaust port 40 be set comprising on two positions of opposite side lower end corner where necessary.Thus, in above-mentioned the 3rd, the 4th embodiment, owing to taken slit bottom 23B with

projection

42,43, just can be as above-mentioned first, second embodiment, both can bring into play the function of slit 23, and can guarantee again along the oily discharge route 40 of gas leakage stream as oily exhaust port.

As mentioned above, describe the present invention, but the present invention is not limited to the foregoing description, only otherwise exceed its purport, can comprises various distortion and change based on specific embodiment.

Claims

1. oil mist separator, this separator passes through throttling passage by making gas leakage, impacts mutually and mist of oil is separated with the impingement wall on being arranged on the gas leakage passage, it is characterized in that,

Be provided with the spacing wall of separating the gas leakage passage in the upstream of above-mentioned impingement wall, form the slit that connects on this spacing wall, this slit extends to the passage diapire of gas leakage passage always;

And, at the upstream and downstream of above-mentioned spacing wall a pair of shield is set, cover the bottom that slit is stated in the residence, and form above-mentioned throttling passage on the top of above-mentioned slit.

2. oil mist separator as claimed in claim 1 is characterized in that, is provided with the stepped part of stretching out downstream on the top of above-mentioned spacing wall, below this stepped part and between above the shield in downstream, forms the rectification passage that connects above-mentioned throttling passage downstream.

3. oil mist separator as claimed in claim 1 or 2, it is characterized in that, in the valve mechanism cover of synthetic resin manufacturing, be formed with the passage upper wall of above-mentioned gas leakage passage and channel side wall and from upright spacing wall and the impingement wall that is provided with of above-mentioned passage upper wall;

Above-mentioned spacing wall one is connecting the passage upper wall and the channel side wall of gas leakage passage;

And at the lower edge place of the spacing wall of being close to effectively with the passage diapire of above-mentioned gas leakage passage very close to each otherly, an end of above-mentioned slit is an open state.

4. oil mist separator, this separator passes through throttling passage by making gas leakage, impacts mutually and mist of oil is separated with the impingement wall in being arranged on the gas leakage passage, it is characterized in that,

And, uprightly being provided with projection from above-mentioned gas leakage passage diapire, this projection is embedded in the bottom of this slit, and forms described throttling passage on the top of above-mentioned slit.