CN104100332A - Engine cylinder cover shield and crankcase ventilation system - Google Patents
Engine cylinder cover shield and crankcase ventilation system Download PDFInfo
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- CN104100332A CN104100332A CN201410380344.XA CN201410380344A CN104100332A CN 104100332 A CN104100332 A CN 104100332A CN 201410380344 A CN201410380344 A CN 201410380344A CN 104100332 A CN104100332 A CN 104100332A
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- deaerator
- extension part
- guard shield
- oil
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Abstract
The invention provides an engine cylinder cover shield which comprises a shield body and a cover plate. The cover plate is arranged in the shield body, the cover plate and the shield body are separated, an oil gas pre-separation space is formed between the cover plate and the shield body, a first gas inlet communicated with a crankcase is arranged in the oil gas pre-separation space, and stacked oil baffles are arranged in the oil gas pre-separation space. Each oil baffle comprises a first extending portion extending upwards and backwards from the starting end, a second extending portion extending upwards and towards the starting end from the tail end of the first extending portion and a third extending portion extending downwards and backwards from the tail end of the first extending portion. A crankcase ventilation system adopting the engine cylinder cover shield is further provided. The shield and the system have the advantages of being good in oil gas pre-separation effect and avoiding adverse effect of low temperature on gas flowing.
Description
Technical field
The present invention relates to motor car engine field, be specifically related to engine cylinder cover guard shield and crankcase ventilation system.
Background technique
Motor, particularly diesel engine, between piston and cylinder, there is certain gap, be called cylinder prepareding gap, this gap can cause gas gas in the jar constantly to drain in crankcase, and crankcase pressure increases gradually, and motor needs to have crankcase ventilation system to help crankcase Exhaust Gas, reduce pressure, simultaneously the oil droplet in filtering gas.Current, the crankcase ventilation system of motor is mostly external oil-gas separator formula, and this type of deaerator is fixed on manifold or cylinder cap by support, and deaerator is connected with cylinder cap guard shield, oil sump by flexible pipe.This type of arranges that flexible pipe is more, and in the winter time, the water vapour in flexible pipe easily freezes, and affects gas flow.
In addition, in prior art, occur oil gas preseparating structure (for example throttle orifice and dividing plate) is set in cylinder cap guard shield inside, before crank case gases enters deaerator, carry out oil gas pre-separation, but separating effect has been unsatisfactory.
Summary of the invention
First object of the present invention is to provide a kind of engine cylinder cover guard shield of pre-separation better effects if, and embodiments of the invention provide following technological scheme for this reason:
A kind of engine cylinder cover guard shield, comprise guard shield body and cover plate, described cover plate is arranged on the inside of described guard shield body, and between described cover plate and described guard shield body, interval forms oil gas pre-separation space, described oil gas pre-separation space has the first suction port being communicated with crankcase, in described oil gas pre-separation space, be provided with stacked oil baffle, described oil baffle has the first extension part that starts upwards and extend back from starting point, the second extension part that starts upwards and extend towards described starting point direction at the end of described the first extension part, with the 3rd extension part that starts at the end of described the first extension part downwards and extend back.
Preferably, described oil baffle also has the 4th extension part, and described the 4th extension part starts downwards and extends towards starting point direction from the end of described the 3rd extension part.
Preferably, the top of described second extension part of lower floor's oil baffle is higher than the bottom of the 4th extension part of upper strata oil baffle.
Preferably, the starting point of described the first extension part is cydariform.
Preferably, in described oil gas pre-separation space, be also provided with interlaced dividing plate, or be also provided with restricting orifice.
Preferably, also one-body molded on described guard shield body have a deaerator nest seat, and described oil gas pre-separation space has the second suction port of the described deaerator nest of direct connection seat.
Another object of the present invention is to provide the more succinct crankcase ventilation system of a kind of gas flow path, thereby reduces outside air temperature to the mobile adverse effect of crank case gases, and embodiments of the invention provide following technological scheme for this reason:
A kind of crankcase ventilation system, comprises engine cylinder cover guard shield as above and deaerator, and described deaerator is installed in described deaerator nest seat.
Preferably, described deaerator nest seat protrudes to the exterior section of described guard shield body, and described the second suction port is arranged on the sidewall of described deaerator nest seat, between described deaerator nest seat and the shell of described deaerator, has gap.
Preferably, on the diapire of described deaerator nest seat, be provided with the one-way valve that leads to engine interior.
Preferably, the suction port of described deaerator is arranged on the bottom of described deaerator.
In cylinder cap guard shield of the present invention, owing to being provided with special formed stacked oil baffle in oil gas pre-separation space, crank case gases is being entered behind the oil gas pre-separation space of cylinder cap guard shield, flow through and become curve, and after flowing, the first extension part runs into stopping of the second extension part, larger oil droplet can accumulate, fall on cover plate, is then back to engine interior, thereby improves oil gas pre-separation effect.
Further, gas is after flowing along the 3rd extension part, and the stopping of the 4th extension part of encountering upper strata oil baffle, larger oil droplet can accumulate, fall on cover plate, is then back to engine interior, thereby improves oil gas pre-separation effect.
Further, lower floor the second extension part top is higher than the height of the 4th extension part bottom, upper strata, the all gas of the passage between two-layer oil baffle makes to flow through, or be subject to for the second stopping of extension part and carry out Oil-gas Separation, or be subject to for the 4th stopping of extension part and carry out Oil-gas Separation, improving oil gas pre-separation effect.
Further, the starting point of the first extension part is expanded to cydariform, not only can reduce the noise in gas flow process, and runs into after the second extension part stop portions backflow at gas, and drum-like shaped can also stop reflux gas, ensures that larger oil droplet fully accumulates.
Further, staggered dividing plate and restricting orifice can further carry out oil gas pre-separation.
Further, because oil gas pre-separation space is directly communicated with deaerator nest seat by the second suction port, and deaerator is installed in deaerator nest seat, therefore between cylinder cap guard shield and deaerator, no longer need flexible pipe to be connected, solve flexible pipe water vapour ice formation issues.
In crankcase ventilation system of the present invention, owing to having adopted cylinder cap guard shield as above to improve oil gas pre-separation efficiency, and deaerator is positioned at deaerator nest seat, reduced the icing probability of water vapour.
Further, in crankcase ventilation system of the present invention, gas directly enters deaerator nest seat after oil gas pre-separation, utilize the gap between deaerator nest seat and the shell of deaerator, at the outer convex position of deaerator nest seat, when winter, little oil droplet remaining in gas easily liquefies at low temperatures, under Action of Gravity Field, flow to diapire along the sidewall of deaerator nest seat, and because the freezing point of water vapour will be higher than fluid, therefore water vapour can condense in the sidewall of deaerator nest seat, in other words, gap between deaerator nest seat and deaerator shell utilizes low temperature to realize further oil gas pre-separation result, and compared with flexible pipe, deicing to deaerator nest seat inwall is obviously simpler, and because the diameter of deaerator nest seat will be much larger than commonly used hose, therefore freezing, it is little that gas communication is hindered.
Further, the suction port of deaerator is located at bottom, and the second suction port of deaerator nest seat is located at sidewall, makes gas flow path and time lengthening in deaerator nest seat, is beneficial to oil gas pre-separation.
Brief description of the drawings
Next in connection with accompanying drawing, specific embodiments of the invention are described in further detail, wherein:
Fig. 1 is the explosive view of the crankcase ventilation system of embodiments of the invention;
Fig. 2 is the bottom view of the engine cylinder cover guard shield of embodiments of the invention;
Fig. 3 is the stereogram along the engine cylinder cover guard shield being rotated after the A-A line in Fig. 2 is cut open;
Fig. 4 is the stereogram of the guard shield body of embodiments of the invention;
Fig. 5 is the stereogram of another angle of the guard shield body of embodiments of the invention;
Fig. 6 is the stereogram of the cover plate of embodiments of the invention;
Fig. 7 is the bottom view of the oil baffle of embodiments of the invention.
Description of symbols in upper figure: air-strainer 100, shell 110, steam outlet pipe 120, guard shield body 200, deaerator nest seat 210, the sidewall 211 of deaerator nest seat, the diapire 212 of deaerator nest seat, one-way valve 213, the second suction port 214, the first suction port 220, the diapire 230 of guard shield body, the sidewall 240 of guard shield body, oil gas pre-separation space 250, baffle plate 260, starting point 261, the first extension part 262, middle-end 263, the second extension part 264, the 3rd extension part 265, end 266, the 4th extension part 267, dividing plate 270, return opening 310, restricting orifice 320, throttle orifice 321.
Embodiment
With reference to figure 1, the crankcase ventilation system in the present embodiment mainly comprises deaerator 100, guard shield body 200 and cover plate 300 3 parts.Wherein guard shield body 200 forms engine cylinder cover guard shield together with fastening to cover plate 300, and the concrete internal structure of engine cylinder cover guard shield will be described below.One-body molded on guard shield body 200 have a deaerator nest seat 210, deaerator 100 is installed in deaerator nest seat 210, that is to say, the shell 110 of deaerator 100 is partly or completely positioned at deaerator nest seat 210 inside, and steam outlet pipe 120 is exposed to outside.
In ensuing description, taking towards a side of engine cylinder cover, cylinder body as in, taking the side that deviates from engine cylinder cover, cylinder body as outside.
With reference to figure 4, except deaerator nest seat 210, guard shield body 200 also has guard shield body diapire 230 and the guard shield body sidewall 240 around guard shield body diapire 230, thereby forms the inner space that is buckled in cylinder cap top.
In conjunction with Fig. 2, Fig. 3, Fig. 4, cover plate 300 is arranged on the inside of guard shield body 200, more high-visible from Fig. 3, interval between the diapire 230 of cover plate 300 and guard shield body 200, thereby form the oil gas pre-separation space 250 of relative closure as shown in Figure 4, and oil gas pre-separation space 250 is the space of a relative closure, be only communicated with in the first suction port 220, the second suction port 214, return opening 310 places and 250 outsides, oil gas pre-separation space.In conjunction with Fig. 2 and Fig. 3, visible in the high order end position of the cover plate 300 shown in Fig. 2, between guard shield body 200 and cover plate 300, reserved the first suction port 220, makes oil gas pre-separation space 250 be communicated with crankcase.As seen from Figure 4, in oil gas pre-separation space 250, be provided with stacked oil baffle 260, interlaced dividing plate 270, and visible in conjunction with Fig. 6, fasten to behind guard shield body 200 inside at cover plate 300, the restricting orifice 320 on cover plate 300 also can extend in oil gas pre-separation space 250.
With reference to figure 7, in this figure, specifically illustrate the stacked structure of multilayer oil baffle 260.In the description of carrying out in conjunction with Fig. 7, easy and clear for what describe, "up" and "down" only refers to direction as shown, does not represent the "up" and "down" in the assembly direction of motor, meanwhile, taking the direction of pointing to end 266 from starting point 261 as vertical direction.Gas in engine crankcase enters oil gas pre-separation space 250 by the first suction port 220, then enters the each layer of gas passageway between oil baffle 260.Each oil baffle 260 all has the first extension part 262, the second extension part 264, the 3rd extension part 265 and the 4th extension part 267.Wherein, the first extension part 262 starts upwards and extends back from the starting point 261 of oil baffle 260, and the first extension part 262 ends at the middle-end 263 of oil baffle 260, that is to say, middle-end 263 is also the end of the first extension part 262 simultaneously.The second extension part 264 starts upwards and extends towards starting point 261 directions at the end (being the middle-end 263 of oil baffle 260) of the first extension part 262.The 3rd extension part 265 starts downwards and continues to extend back at the end (being the middle-end 263 of oil baffle 260) of the first extension part 262, and the 3rd extension part ends at the end 266 of oil baffle 260.Like this, see on the whole, the first extension part 262, the second extension part 264 and the 3rd extension part 265 have formed roughly " entering " word shape.Oil baffle 260 also has the 4th extension part 267, the four extension parts 267 and extends downwards and towards starting point 261 directions since the end (being the end 266 of oil baffle 260) of the 3rd extension part 265.The starting point 261 of oil baffle 260 expands and forms drum-like shaped, makes the upper and lower end face of starting point 261 all exceed the upper and lower surface of the first extension part 262.Crank case gases enters the each layer of gas passageway process between oil baffle 260 from the first suction port 220, and first gas run into starting point 261, shunted at this gas, and because cydariform effect has reduced pneumatic noise.Subsequently, gas flows along direction shown in the band arrow solid line in figure, flow direction starts to become curve, gas is blocked after running into the second extension part 264, on the separated surface that is attached to the first extension part 262 and the second extension part 264 of larger oil droplet, then under Action of Gravity Field, drop onto on cover plate 300, then flow back into engine interior from refluxing opening 310.Meanwhile, because gas and the second extension part 264 collisions can cause a part of gas backstreaming, as shown in the band arrow dotted line in figure, this portion gas can run into the stopping of starting point 261 of cydariform, makes larger oil droplet fully assemble and drop.After the second extension part 264, gas continues along the channel flow between upper and lower two-layer the 3rd extension part 265, run into after the stopping of the 4th extension part 267 of upper strata oil baffle 260, oil droplet in gas is continued to be separated, the surface that is gathered in the 3rd extension part 265 and the 4th extension part 267 then falls on cover plate 300 under Action of Gravity Field.As seen from the figure, represent horizontal line with dotted line, the top of the second extension part 264 of lower floor's oil baffle 260 will be higher than the bottom of the 4th extension part 267 of upper strata oil baffle 260, like this, the all gas of the passage between two-layer oil baffle 260 of flowing through, or be subject to stopping of the second extension part 264 and carry out Oil-gas Separation, or be subject to stopping of the 4th extension part 267 and carry out Oil-gas Separation, substantially the larger oil droplet in all gas all can be separated, thereby improves oil gas pre-separation effect.
Although in the foregoing description to " on ", the concept of D score carried out specific explanations, particularly, oil baffle 260 is to be attached on diapire 230, but those skilled in the art should imagine, stacked oil baffle 260 can also be attached on sidewall 240, now in oil baffle 260 structures " on ", D score direction is consistent with the assembly direction of cylinder block, cylinder head, cylinder cap guard shield, this still belongs to the category of the "up" and "down" in claim.But in the time that oil baffle 260 is attached on sidewall 240, the oil droplet of assembling on upper strata oil baffle 260 can drop on lower floor's oil baffle 260 but not drop on cover plate 300, thereby causes the gas channel trapped fuel between oil baffle 260, is not therefore preferred.
In conjunction with Fig. 4 and Fig. 6, gas is leaving after stacked oil baffle 260, and continue to flow process staggered dividing plate 270 and restricting orifice 320, carry out further oil gas pre-separation at dividing plate 270 places and throttle orifice 321 places.Subsequently, the gas in oil gas pre-separation space 250 directly enters oil gas pre-separation nest seat 210 by the second suction port 214.As seen from Figure 4, deaerator nest seat 210 parts are protruding in guard shield body interior, the protruding outside to guard shield body of part.On deaerator nest seat diapire 212, be provided with one-way valve 213, one-way valve 213 only allows the direction of flow engine interior in deaerator nest seat 210, and does not allow to flow in the other direction.
With reference to figure 5, visible the second suction port 214 is arranged on deaerator nest seat sidewall 211.
In conjunction with Fig. 1 and Fig. 5, deaerator 100 be installed to deaerator nest seat 210 interior after, between the sidewall 211 of deaerator shell 110 and deaerator nest seat, have gap, the internal diameter of deaerator nest seat 210 is greater than the external diameter of deaerator shell 110.And the suction port of preferred oil gas separating device 100 is positioned at its bottom.Like this, in the crankcase ventilation system of the present embodiment, crank case gases is after a series of oil gas pre-separations in oil gas pre-separation space 250, directly enter in deaerator nest seat 210 from the second suction port 214, and flow in gap between deaerator nest seat 210 and deaerator 100.First, between deaerator 100 and guard shield body 200, no longer need flexible pipe to be connected, avoid freezing in flexible pipe; Secondly, when winter, rely on the cold service of deaerator nest seat 210 projections, gas temperature mobile in gap between deaerator nest seat 210 and deaerator 100 is lowered, little oil droplet remaining in gas easily liquefies at low temperatures, under Action of Gravity Field, flow to diapire 212 along the sidewall 211 of deaerator nest seat 210, and be back to engine interior via one-way valve 213.And because the freezing point of water vapour will be higher than fluid, therefore water vapour can condense on the sidewall 211 of deaerator nest seat 210, in other words, gap between deaerator nest seat 210 and deaerator shell 110 utilizes low temperature to realize further oil gas pre-separation and removes water vapour effect, and compared with flexible pipe, deicing to deaerator nest seat 210 inwalls is obviously simpler, and because the diameter of deaerator nest seat 210 will be much larger than commonly used hose, therefore freezing, it is little that gas communication is hindered.That is to say, when the present invention has avoided adverse effect that low temperature brings, utilize low temperature to produce oil gas separation.And the suction port of deaerator 100 is arranged on the bottom of deaerator 100, like this, after second suction port 214 of gas from the sidewall 211 of deaerator nest seat enters, be lengthened out at deaerator nest seat 210 interior flow paths and time, and then entering deaerator 100 inside, it is more abundant that this is beneficial to oil gas pre-separation.
Although the present invention is described in conjunction with above embodiment, the present invention is not defined to above-described embodiment, and those of ordinary skill in the art can easily modify to it and change, but does not leave essence design of the present invention and scope.
Claims (10)
1. an engine cylinder cover guard shield, comprise guard shield body and cover plate, described cover plate is arranged on the inside of described guard shield body, and between described cover plate and described guard shield body, interval forms oil gas pre-separation space, described oil gas pre-separation space has the first suction port being communicated with crankcase, it is characterized in that, in described oil gas pre-separation space, be provided with stacked oil baffle, described oil baffle has the first extension part that starts upwards and extend back from starting point, the second extension part that starts upwards and extend towards described starting point direction at the end of described the first extension part, with the 3rd extension part that starts at the end of described the first extension part downwards and extend back.
2. engine cylinder cover guard shield according to claim 1, is characterized in that, described oil baffle also has the 4th extension part, and described the 4th extension part starts downwards and extends towards starting point direction from the end of described the 3rd extension part.
3. engine cylinder cover guard shield according to claim 2, is characterized in that, the top of described second extension part of lower floor's oil baffle is higher than the bottom of the 4th extension part of upper strata oil baffle.
4. engine cylinder cover guard shield according to claim 1, is characterized in that, the starting point of described the first extension part is cydariform.
5. engine cylinder cover guard shield according to claim 1, is characterized in that, in described oil gas pre-separation space, is also provided with interlaced dividing plate, or is also provided with restricting orifice.
6. according to the engine cylinder cover guard shield described in any one in claim 1 to 5, it is characterized in that, also one-body molded on described guard shield body have a deaerator nest seat, and described oil gas pre-separation space has the second suction port of the described deaerator nest of direct connection seat.
7. a crankcase ventilation system, is characterized in that, comprises engine cylinder cover guard shield as claimed in claim 6 and deaerator, and described deaerator is installed in described deaerator nest seat.
8. crankcase ventilation system according to claim 7, it is characterized in that, described deaerator nest seat protrudes to the exterior section of described guard shield body, described the second suction port is arranged on the sidewall of described deaerator nest seat, between described deaerator nest seat and the shell of described deaerator, has gap.
9. crankcase ventilation system according to claim 8, is characterized in that, on the diapire of described deaerator nest seat, is provided with the one-way valve that leads to engine interior.
10. crankcase ventilation system according to claim 8, is characterized in that, the suction port of described deaerator is arranged on the bottom of described deaerator.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201410380344.XA CN104100332B (en) | 2014-08-04 | 2014-08-04 | Engine cylinder cover guard shield and crankcase ventilation system |
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| CN201410380344.XA CN104100332B (en) | 2014-08-04 | 2014-08-04 | Engine cylinder cover guard shield and crankcase ventilation system |
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| CN104100332B CN104100332B (en) | 2016-05-11 |
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