CN212985336U - Closed crankcase ventilation system and engine - Google Patents
Closed crankcase ventilation system and engine Download PDFInfo
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- CN212985336U CN212985336U CN202021538666.XU CN202021538666U CN212985336U CN 212985336 U CN212985336 U CN 212985336U CN 202021538666 U CN202021538666 U CN 202021538666U CN 212985336 U CN212985336 U CN 212985336U
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- crankcase ventilation
- closed crankcase
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Abstract
The utility model discloses a closed crankcase ventilation system and engine, closed crankcase ventilation system includes: the oil-gas separator, the supercharger, a connecting pipeline for communicating the oil-gas separator and the supercharger, and a filter capable of filtering water vapor and connected in series on the connecting pipeline. The utility model discloses a closed crankcase ventilation system realizes filtering the gas separated out by the oil-gas separator and filtering out vapor, namely, removing the vapor in the gas before the supercharger, avoiding the vapor from entering the compressor intake pipe of the supercharger, thereby avoiding the vapor from condensing and freezing at the inlet of the compressor intake pipe, and further avoiding the blockage of the compressor intake pipe due to the freezing of the vapor; meanwhile, the phenomenon that water vapor enters the intercooler is avoided, freezing of the intercooler due to freezing of the water vapor is effectively avoided, the freezing of a water drain valve is avoided for the intercooler with the water drain valve, and the stability is improved.
Description
Technical Field
The utility model relates to an engine technical field, more specifically say, relate to a closed crankcase ventilation system and engine.
Background
During operation of the engine, the high-pressure combustible mixture and burnt gases in the combustion chamber leak into the crankcase more or less through the gap between the piston group and the cylinder. In order to prevent excessive crankcase pressure, extend oil life, reduce wear and corrosion of parts, and prevent engine oil leakage, crankcase ventilation must be performed, typically with a closed crankcase ventilation system.
As shown in fig. 1, in the closed crankcase ventilation system, gas in a crankcase is discharged from a cylinder head cover 12, then enters an oil-gas separator 13, is separated by the oil-gas separator 13, oil flows back to an oil pan of the crankcase, and the gas passes through a compressor intake pipe of a supercharger 15 downstream of an air cleaner 14, is supercharged by the supercharger 15, enters an intercooler 16 for cooling, and finally enters an intake pipe of an engine. Wherein a crankcase is provided in the machine body 11.
The gas in the crankcase contains engine oil and water vapor, and particularly in a natural gas engine, the water vapor content is high. After passing through the oil-gas separator 13, the gas containing part of the engine oil and water vapor passes through the compressor inlet pipe of the supercharger 15. When the ambient temperature is low, for example, the ambient temperature is-15 ℃, water vapor is condensed and frozen at the inlet of the air inlet pipe of the air compressor, and the air inlet pipe of the air compressor is blocked.
In addition, the water vapor flows to the supercharger 15 and then flows to the intercooler 16, the cooling capacity of the intercooler 16 is high, and the water vapor is condensed, separated and frozen, so that the intercooler 16 is frozen and cracked; and if the water drain valves are arranged on part of the intercoolers 16, the risk of icing and failure of the water drain valves is extremely high, and the stability is poor.
Although the oil is reduced after the gas passes through the oil separator 13, the oil remains, and when the gas passes through the pressure end of the supercharger 15, the oil adheres to the pressure roller and the pressure shell of the supercharger 15, mixes with dust in the air, becomes sludge, and causes the pressure end of the supercharger 15 to be inefficient.
In summary, how to avoid the water vapor from being condensed and frozen at the inlet of the air inlet pipe of the compressor, so as to avoid blocking the air inlet pipe of the compressor, is a problem to be solved urgently by those skilled in the art.
SUMMERY OF THE UTILITY MODEL
In view of this, the utility model aims at providing a closed crankcase ventilation system avoids vapor to freeze at the entrance condensation of compressor intake pipe to avoid blockking up the compressor intake pipe. Another object of the present invention is to provide an engine having the above-mentioned closed crankcase ventilation system.
In order to achieve the above object, the utility model provides a following technical scheme:
a closed crankcase ventilation system comprising: the oil-gas separator, the supercharger, a connecting pipeline for communicating the oil-gas separator and the supercharger, and a filter capable of filtering water vapor and connected in series on the connecting pipeline.
Preferably, the filter is a device capable of filtering engine oil.
Preferably, the filter has a medium chamber for storing the filtered medium.
Preferably, the medium chamber has a drain, the drain being provided with a drain valve.
Preferably, the discharge valve has:
a first open state that the medium filtered by the filter is opened when the medium is accumulated to a set value or the filter is opened within a set working time;
a second open state in which the environment temperature is within a set temperature range and the vehicle is opened after stopping;
a closed state in which the medium filtered by the filter is closed after being discharged.
Preferably, the discharge valve is an electrically controlled valve.
Preferably, the closed crankcase ventilation system further comprises a controller for controlling the opening and closing of the electric control valve.
Preferably, the discharge valve is a mechanical valve.
Preferably, the filter is a coalescing filter.
Based on the above-mentioned closed crankcase ventilation system that provides, the utility model also provides an engine, this engine include closed crankcase ventilation system, closed crankcase ventilation system is above-mentioned arbitrary closed crankcase ventilation system.
The utility model provides a closed crankcase ventilation system, through concatenating the filter on the connecting line of connecting oil and gas separator and booster, this filter can filter vapor, then realized filtering the gas that oil and gas separator separated, get rid of the vapor in the gas before the booster, avoided vapor to get into the compressor intake pipe of booster to avoided the vapor to freeze at the entrance condensation of compressor intake pipe, and then avoided because of the frozen compressor intake pipe of blocking of vapor; meanwhile, the phenomenon that water vapor enters the intercooler is avoided, freezing of the intercooler due to freezing of the water vapor is effectively avoided, the freezing of a water drain valve is avoided for the intercooler with the water drain valve, and the stability is improved.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required to be used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the provided drawings without creative efforts.
FIG. 1 is a schematic illustration of a closed crankcase ventilation system provided by the prior art;
fig. 2 is a schematic structural view of a closed crankcase ventilation system according to an embodiment of the present invention;
fig. 3 is a schematic structural view of a filter in a closed crankcase ventilation system according to an embodiment of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.
As shown in fig. 2, an embodiment of the present invention provides a closed crankcase ventilation system, including: the oil-gas separator 23, the supercharger 25, a connecting pipe connecting the oil-gas separator 23 and the supercharger 25, and a filter 27 capable of filtering water vapor and connected in series to the connecting pipe.
The gas-oil separator 23 is used to filter the engine oil in the crankcase ventilation gas for the first time.
The closed crankcase ventilation system further includes a crankcase, an air cleaner 24, an intercooler 26, a head cover 22, and a body 21. The gas in the crankcase is discharged from the cylinder head cover 22, then enters the oil-gas separator 23, is separated by the oil-gas separator 23, the engine oil flows back to the oil pan of the crankcase, the gas is filtered by the filter 27 to remove water vapor, then passes through the compressor air inlet pipe of the supercharger 25 at the downstream of the air filter 24, is supercharged by the supercharger 25, enters the intercooler 26 for cooling, and finally enters the air inlet pipe of the engine. Wherein a crankcase is provided in the machine body 21.
The embodiment of the utility model provides a closed crankcase ventilation system, through concatenating filter 27 on the connecting line of connecting oil and gas separator 23 and booster 25, this filter 27 can filter the aqueous vapor, then realized filtering the gas that oil and gas separator 23 separated, get rid of the aqueous vapor in the gas before booster 25, avoided aqueous vapor to get into the compressor intake pipe of booster 25, thereby avoided the aqueous vapor to condense at the entrance of compressor intake pipe and freeze, and then avoided blocking compressor intake pipe because of the aqueous vapor freezes; meanwhile, the phenomenon that water vapor enters the intercooler 26 is avoided, the phenomenon that the intercooler 26 is frozen due to the fact that the water vapor is frozen is effectively avoided, the phenomenon that a water drain valve is frozen is avoided for the intercooler 26 with the water drain valve, and stability is improved.
In order to further optimize the above technical solution, the filter 27 is a device capable of filtering oil. In this case, the filter 27 can filter both oil and water vapor.
The specific structure of the filter 27 is designed according to actual needs, and this embodiment is not limited to this.
Among the above-mentioned closed crankcase ventilation system, filter the gas that oil and gas separator 23 separated through filter 27, and filter machine oil, then realized secondary filter machine oil, reduced the machine oil volume that gets into booster 25, reduced the machine oil on attached to the pinch roller of booster 25 and pressure shell promptly, effectively reduced the pollution of machine oil to booster 25, improved booster 25's pressure end efficiency.
For ease of use, the filter 27 has a media receptacle 275, and the media receptacle 275 is adapted to receive filtered media. It will be understood that when the filter 27 is only capable of filtering water vapor, the filtered medium is water vapor; when the filter 27 is capable of filtering water vapor and engine oil, the filtered medium is water vapor and engine oil.
In the above-described structure, the medium filtered by the filter 27 is first stored in the medium accommodating chamber 275, and is discharged when it is necessary to discharge the medium. Of course, alternatively, the filter 27 may not have the media receptacle 275, and the filter 27 may filter and discharge filtered media.
The specific shape and size of the medium cavity 275 are selected according to actual needs, and this embodiment is not limited thereto.
To facilitate drainage of the filtered media, the media chamber 275 preferably has a drain port 276 with a drain valve 28 disposed at the drain port 276.
Preferably, the discharge valve 28 has: a first open state in which the medium filtered by the filter 27 is opened when accumulated to a set value, or the filter 27 is opened for a set time during operation; a closed state in which the medium filtered by the filter 27 is discharged.
When the lowest temperature of the ambient temperature is close to 0 ℃, for example, in winter, water remains in the filter 27, and the water in the filter 27 may freeze after the vehicle is stopped. To avoid freezing, the rice discharge valve 28 has a second open state in which the ambient temperature is within the set temperature range and is opened after the vehicle stops.
Specifically, the discharge valve 28 is opened when the medium filtered by the filter 27 is accumulated to a set value, or the discharge valve 28 is opened when the filter 27 is operated for a set time; when the ambient temperature is within the set temperature range, opening the discharge valve 28 after the vehicle is stopped; the discharge valve 28 is closed when the medium filtered by the filter 27 is discharged.
The type of discharge valve 28 described above is selected according to the actual requirements. The discharge valve 28 is, for example, an electrically controlled valve or a mechanical valve. For ease of control, it is preferred that the bleed valve 28 be an electrically controlled valve. Further, the closed crankcase ventilation system further comprises a controller 29 for controlling the opening and closing of the electric control valve.
Specifically, the controller 29 is an electronic engine control unit, and controls the engine to normally operate, and is provided with an ambient temperature sensor. When the medium filtered by the filter 27 is accumulated to a set value, or when the filter 27 is operated for a set time, the controller 29 controls the discharge valve 28 to be opened; when the ambient temperature is within the set temperature range, the controller 29 opens the discharge valve 28 after the shutdown; when the medium filtered by the filter 27 is discharged, the controller 29 closes the discharge valve 28.
The set value, the set time, and the set temperature range are set according to actual needs, which is not limited in this embodiment.
When the discharge valve 28 is a mechanical valve, it may be a mechanical automatic discharge valve or a mechanical manual opening and closing discharge valve, but it cannot realize the water discharge during the winter parking.
Preferably, as shown in fig. 3, the filter 27 includes: a filter case 271, a filter element 272 provided in the filter case 271; wherein the filter case 271 has: filter inlet 273, filter outlet 274, and media receptacle 275; the medium cavity 275 is used for storing filtered medium, the filter element 272 is higher than the medium cavity 275, and a discharge valve 28 is arranged at a discharge port 276 of the medium cavity 275; the filter element 272 may filter water vapor and engine oil.
Of course, the filter 27 may have another structure, which is not limited in this embodiment.
The specific type of the filter 27 is selected according to actual needs, and for example, the filter 27 is a condensation filter that separates and filters water vapor and engine oil in the gas by condensation. Of course, the filter 27 may be of another type, which is not limited in this embodiment.
As shown in fig. 2, in the closed crankcase ventilation system, gas in the crankcase flows out from the crankcase and first passes through the oil-gas separator 23 to realize first separation and filtration of engine oil, the separated engine oil flows back to the oil pan from the lower part of the oil-gas separator 23, crankcase gas with water vapor and residual engine oil flows out of the oil-gas separator 23 and then enters the filter 27, in the filter 27, the water vapor and the engine oil in the crankcase gas are condensed and remain in the medium accommodating cavity 275 at the bottom of the filter 27, the crankcase gas with the water vapor and the engine oil filtered out flows out of the filter 27 and then flows to the compressor inlet pipe of the supercharger 25, the crankcase gas is mixed with air passing through the air filter 24 and then enters the supercharger 25, the crankcase gas is cooled after being supercharged, and the cooled gas enters the inlet pipe of the engine.
The closed crankcase ventilation system fundamentally eliminates the water vapor and the engine oil in the crankcase gas, and avoids oil pollution and water icing caused by the water vapor and the engine oil entering an engine air inlet system.
Based on the closed crankcase ventilation system that above-mentioned embodiment provided, this embodiment still provides an engine, and this engine includes closed crankcase ventilation system, and this closed crankcase ventilation system is the closed crankcase ventilation system described for above-mentioned embodiment.
Because above-mentioned closed crankcase ventilation system has above-mentioned technological effect, above-mentioned engine includes above-mentioned closed crankcase ventilation system, then above-mentioned engine also has corresponding technological effect, and this text is no longer repeated.
The type of the engine is selected according to actual needs, and for example, the engine is a gas engine, and specifically, the engine is a natural gas engine. This embodiment is not limited to this.
The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Claims (10)
1. A closed crankcase ventilation system comprising: the closed crankcase ventilation system comprises an oil-gas separator (23), a supercharger (25) and a connecting pipeline for communicating the oil-gas separator (23) with the supercharger (25), and is characterized by further comprising a filter (27) which can filter water vapor and is connected to the connecting pipeline in series.
2. A closed crankcase ventilation system according to claim 1, characterised in that the filter (27) is a device capable of filtering oil.
3. The closed crankcase ventilation system according to claim 1, wherein the filter (27) has a media volume (275), the media volume (275) being configured to store filtered media.
4. The closed crankcase ventilation system according to claim 3, wherein the media volume (275) has a drain (276), and a drain valve (28) is disposed at the drain (276).
5. The closed crankcase ventilation system according to claim 4, wherein the drain valve (28) has:
a first open state that the medium filtered by the filter (27) is opened when the medium is accumulated to a set value or the filter (27) is opened at a set working time;
a second open state in which the environment temperature is within a set temperature range and the vehicle is opened after stopping;
a closed state in which the medium filtered by the filter (27) is discharged.
6. Closed crankcase ventilation system according to claim 4, wherein the drain valve (28) is an electrically controlled valve.
7. The closed crankcase ventilation system according to claim 6, further comprising a controller (29) that controls the opening and closing of the electrically controlled valve.
8. Closed crankcase ventilation system according to claim 4, wherein the drain valve (28) is a mechanical valve.
9. Closed crankcase ventilation system according to any of claims 1-8, wherein the filter (27) is a coalescing filter.
10. An engine comprising a closed crankcase ventilation system, wherein the closed crankcase ventilation system is a closed crankcase ventilation system according to any one of claims 1-9.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202021538666.XU CN212985336U (en) | 2020-07-29 | 2020-07-29 | Closed crankcase ventilation system and engine |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202021538666.XU CN212985336U (en) | 2020-07-29 | 2020-07-29 | Closed crankcase ventilation system and engine |
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| Publication Number | Publication Date |
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| CN212985336U true CN212985336U (en) | 2021-04-16 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202021538666.XU Active CN212985336U (en) | 2020-07-29 | 2020-07-29 | Closed crankcase ventilation system and engine |
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| CN (1) | CN212985336U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114941558A (en) * | 2022-05-09 | 2022-08-26 | 潍柴动力股份有限公司 | Gas moisture content measuring device and method |
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2020
- 2020-07-29 CN CN202021538666.XU patent/CN212985336U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114941558A (en) * | 2022-05-09 | 2022-08-26 | 潍柴动力股份有限公司 | Gas moisture content measuring device and method |
| CN114941558B (en) * | 2022-05-09 | 2023-08-18 | 潍柴动力股份有限公司 | Device and method for measuring water content of gas |
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