CN210977631U - Supercharged engine crankcase ventilation system - Google Patents
Supercharged engine crankcase ventilation system Download PDFInfo
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- CN210977631U CN210977631U CN201921953657.4U CN201921953657U CN210977631U CN 210977631 U CN210977631 U CN 210977631U CN 201921953657 U CN201921953657 U CN 201921953657U CN 210977631 U CN210977631 U CN 210977631U
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Abstract
The utility model relates to a crankcase ventilation system technical field discloses a supercharged engine crankcase ventilation system. Supercharged engine crankcase ventilation system includes crankcase, booster, air throttle, air supplement pipe and breather pipe, and the booster includes pressure boost air inlet and pressure boost gas outlet, and the air throttle includes the inlet end and gives vent to anger the end, and pressure boost air inlet can communicate with the atmosphere, and pressure boost gas outlet communicates with air supplement pipe and inlet end respectively, and the air supplement pipe can communicate with the crankcase, and the end of giving vent to anger can communicate with the combustion chamber, and the breather pipe can communicate with the crankcase, and the breather pipe folk prescription respectively switches on to giving vent to anger end and pressure boost air inlet. The utility model provides a when the air supplement pipe makes the engine during operation under little load and heavy load, the atmosphere homoenergetic drives the scurring gas of crankcase and sweeps, supplements fresh air for the crankcase simultaneously, strengthens the ventilation of crankcase, reduces the probability of machine oil oxidation, emulsification or dilution, slows down the wearing and tearing and the corruption of part, improves the reliability and the durability of engine.
Description
Technical Field
The utility model relates to a crankcase ventilation system technical field especially relates to a supercharged engine crankcase ventilation system.
Background
During engine operation, gases within the combustion chamber may leak into the crankcase from the gap between the piston assembly and the cylinder, causing blow-by. Crankcase ventilation systems are capable of drawing blow-by gases from the crankcase into the intake manifold for re-combustion in the combustion chamber of the engine. Crankcase ventilation system can effectively prevent because of the harm that the blowby gas produced in the crankcase, guarantees the normal work of crankcase.
In the prior art, when an engine works under a large load, blow-by gas and air in a crankcase are introduced into an air filter by a crankcase ventilation system, then sequentially pass through a supercharger, a throttle valve and an air inlet manifold and finally enter a combustion chamber of the engine for combustion. The crankcase ventilation system can pump out blow-by gas in the crankcase, but fresh air is not supplemented in the crankcase, so that the ventilation in the crankcase is incomplete, engine oil is easy to oxidize, emulsify or dilute, the abrasion and corrosion rate of parts is accelerated, the reliability and durability of an engine are reduced, the oil change period is shortened, and the cost is increased.
Accordingly, it is desirable to provide a supercharged engine crankcase ventilation system that addresses the above-mentioned problems.
SUMMERY OF THE UTILITY MODEL
Based on above, an object of the utility model is to provide a supercharged engine crankcase ventilation system to solve current crankcase ventilation system because of ventilate in the crankcase thoroughly and the easy oxidation of machine oil that leads to, emulsification or dilution, the wearing and tearing and the corrosion rate of part have been reduced with higher speed, have reduced the reliability and the durability of engine, and have shortened the oil change cycle, the problem of incremental cost.
In order to achieve the purpose, the utility model adopts the following technical proposal:
a supercharged engine crankcase ventilation system comprising:
a crankcase;
a supercharger comprising a boost air inlet and a boost air outlet, the boost air inlet being communicable with the atmosphere;
a throttle valve comprising an air inlet end communicable with the pressurized air outlet and an air outlet end configured to communicable with a combustion chamber;
one end of the air supplementing pipe is communicated with the supercharging air outlet, and the other end of the air supplementing pipe can be communicated with the crankcase;
the breather pipe, it can with the crankcase intercommunication, just the breather pipe can the unilateral respectively switch on extremely the pressure boost air inlet with the end of giving vent to anger.
Further, the supercharged engine crankcase ventilation system also includes an air-oil separator having a first end communicable with the crankcase and a second end communicable with the breather pipe.
Further, a first filter screen is arranged in the oil-gas separator.
Further, still be provided with the second filter screen in the oil and gas separator, along the air current direction, first filter screen with the second filter screen set gradually in the oil and gas separator, the aperture of first filter screen is greater than the aperture of second filter screen.
Furthermore, supercharged engine crankcase ventilation system still includes oil return pipe, oil and gas separator has the third end, oil return pipe's one end with the third end intercommunication, oil return pipe's the other end unilateral switches on to the crankcase.
Furthermore, supercharged engine crankcase ventilation system still includes oil water separator, oil water separator set up in return oil pipe is last.
Furthermore, supercharged engine crankcase ventilation system still includes first check valve, first check valve sets up in return oil pipe is last.
Further, supercharged engine crankcase ventilation system still includes the second check valve, the breather pipe passes through the second check valve with it is connected to go out the gas end.
Further, the supercharged engine crankcase ventilation system further comprises a third one-way valve, and the breather pipe is connected with the supercharged air inlet through the third one-way valve.
The utility model has the advantages that:
the utility model provides a supercharged engine crankcase ventilation system includes the crankcase, the booster, the air throttle, air supplement pipe and breather pipe, the booster includes pressure boost air inlet and pressure boost gas outlet, the air throttle includes the inlet end and gives vent to anger the end, pressure boost air inlet can communicate with the atmosphere, pressure boost gas outlet communicates with air supplement pipe and inlet end respectively, the air supplement pipe can also communicate with the crankcase, the end of giving vent to anger can communicate with the combustion chamber, store up the blowby gas in the crankcase, the breather pipe can communicate with the crankcase, the breather pipe still unilateral switches on to the end of giving vent to anger and pressure boost air inlet respectively. When the engine works at idle speed or low load, the supercharger does not work, the opening of the throttle valve is small, the vacuum degree of the air outlet end of the throttle valve is high, fresh air enters the air supply pipe from the supercharging air outlet and enters the crankcase, then blow-by gas in the crankcase passes through the vent pipe and the air outlet end and finally enters the combustion chamber for combustion; when the rotating speed or the load of the engine is increased, the supercharger works, the opening degree of the throttle valve is increased, the pressure of the atmosphere is increased after the atmosphere passes through the supercharger, the atmosphere enters the crankcase through the air supplementing pipe, then blow-by gas in the crankcase is swept to enable the blow-by gas to sequentially pass through the oil-gas separator and the breather pipe, enters the air inlet of the supercharger with lower pressure, and enters the combustion chamber again for combustion. The air supply pipe is arranged, so that when the engine works under a small load and a large load, the air can drive and sweep blowby gas of the crankcase, fresh air is supplied to the crankcase, ventilation of the crankcase is enhanced, the probability of oxidation, emulsification or dilution of engine oil is reduced, the abrasion and corrosion rate of parts are reduced, and the reliability and durability of the engine are improved.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings used in the description of the embodiments will be briefly described below, and it is obvious that the drawings in the description below are only some embodiments of the present invention, and it is obvious for those skilled in the art that other drawings can be obtained according to these drawings without creative efforts. Wherein:
fig. 1 is a schematic structural view of a supercharged engine crankcase ventilation system according to an embodiment of the present invention.
In the figure:
1-a crankcase; 2-a supercharger; 3-a throttle valve; 4-air supplement pipe; 5-a breather pipe; 6-an oil-gas separator; 7-an oil return pipe; 8-a first one-way valve; 9-a second one-way valve; 10-a third one-way valve; 11-an intercooler; 12-valve chamber cover; 13-an air filter; 14-a purge tube;
21-a boost air inlet; 22-a pressurized air outlet; 31-an air inlet end; 32-an air outlet end; 51-first vent; 52-a second vent; 53-third vent; 61-a first end; 62-a second end; 63-a first screen; 64-a second screen; 65-third end.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings and embodiments. It is to be understood that the specific embodiments described herein are for purposes of illustration only and are not to be construed as limitations of the invention. It should be further noted that, for the convenience of description, only some of the structures related to the present invention are shown in the drawings, not all of the structures.
As shown in fig. 1, the present embodiment provides a supercharged engine crankcase ventilation system, which can reintroduce blow-by gas in a crankcase into a combustion chamber for combustion, prevent blow-by gas from being discharged into the atmosphere to pollute the environment, and ensure the normal operation of the crankcase. This supercharged engine crankcase ventilation system includes crankcase 1, booster 2, throttle valve 3, air make-up pipe 4 and breather pipe 5, and booster 2 includes pressure boost air inlet 21 and pressure boost gas outlet 22, and throttle valve 3 includes inlet end 31 and the end 32 of giving vent to anger, and pressure boost air inlet 21 can communicate with the atmosphere, and inlet end 31 can communicate with pressure boost gas outlet 22, and the end 32 of giving vent to anger communicates with the combustion chamber. One end of the air supply pipe 4 is communicated with the supercharging air outlet 22, and the other end can be communicated with the crankcase 1. The crankcase 1 stores blow-by gas, and the air supply pipe 4 is respectively communicated to the air outlet end 32 and the supercharging air inlet 21 in a single direction. When the engine works at idle speed or low load, the supercharger 2 does not work, the opening degree of the throttle valve 3 is small, namely, the pressure difference between the air inlet end 31 and the air outlet end 32 is large, and the vacuum degree of the air outlet end 32 is high. The atmospheric air enters the crankcase 1 through the pressurized air inlet 21, sequentially passes through the pressurized air outlet 22 and the air supplementing pipe 4, then passes through the vent pipe 5 and the air outlet end 32 together with the blow-by gas in the crankcase 1, and finally enters the combustion chamber for combustion. When the engine speed or load increases, the supercharger 2 operates, and the opening degree of the throttle valve 3 becomes large, that is, the pressure difference between the intake end 31 and the exhaust end 32 becomes small. After passing through the supercharger 2, the atmospheric air increases in pressure and enters the crankcase 1 through the air supply pipe 4, and then the atmospheric air and blow-by gas in the crankcase 1 sequentially pass through the vent pipe 5, the supercharger 2 and the throttle valve 3 and enter a combustion chamber for combustion. The air supply pipe 4 is arranged, so that when the engine works under a small load and a large load, the air can scavenge the blowby gas of the crankcase 1, meanwhile, fresh air is supplemented for the crankcase 1, the pressure in the crankcase 1 is maintained to be stable, the ventilation of the crankcase 1 is enhanced, the probability of oxidation, emulsification or dilution of engine oil is reduced, the abrasion and corrosion rate of parts is reduced, and the reliability and durability of the engine are improved.
An air filter 13 is arranged between the supercharger 2 and the atmosphere, and the air filter 13 filters the atmosphere and introduces filtered fresh air into the supercharger 2.
Further, the supercharged engine crankcase ventilation system further comprises an intercooler 11, and the air inlet end 31 is connected with the supercharged air outlet 22 through the intercooler 11.
The supercharged engine crankcase ventilation system further comprises a valve chamber cover 12, the valve chamber cover 12 is communicated with the crankcase 1, and blow-by gas in the crankcase 1 can enter the valve chamber cover 12. The valve chamber cover 12 communicates with the air supplement pipe 4 and the air vent pipe 5, respectively. Fresh air entering the valve chamber cover 12 from the supply pipe 4 enters the breather pipe 5 together with blow-by gas.
Wherein, an oil-gas separator 6 is arranged between the valve chamber cover 12 and the vent pipe 5, the oil-gas separator 6 filters fresh air and blow-by gas flowing out from the valve chamber cover 12, lubricating oil and liquefied water vapor in the fresh air and blow-by gas are filtered, the lubricating oil mixed with liquid water is left in the oil-gas separator 6, and the filtered gas enters the vent pipe 5. The arrangement of the oil-gas separator 6 filters the liquefied moisture in the oil-gas separator, reduces the incidence of deterioration failure of the lubricating oil, has more obvious effect particularly on a supercharged engine burning alcohol, reduces the probability of oxidation, emulsification or dilution of engine oil, slows down the abrasion and corrosion rate of parts, and improves the reliability and durability of the engine.
Specifically, the gas-oil separator 6 has a first end 61 and a second end 62, the first end 61 communicating with the crankcase 1, and the second end 62 communicating with the breather pipe 5. Further, the first end 61 communicates with the valve chamber cover 12.
Specifically, the supercharged engine crankcase ventilation system further comprises a purification pipe 14, one end of the purification pipe 14 is communicated with the valve chamber cover 12, the other end of the purification pipe is communicated with the first end 61, and gas in the valve chamber cover 12 enters the oil-gas separator 6 through the purification pipe 14.
A first filter screen 63 is arranged in the oil-gas separator 6, and the first filter screen 63 can separate oil and gas from fresh air and blow-by gas.
In order to improve the filtering effect, a second filter screen 64 is further arranged in the oil-gas separator 6, and the pore diameter of the first filter screen 63 is larger than that of the second filter screen 64. In the air flow direction, a first filter 63 and a second filter 64 are disposed in the oil separator 6 in this order. That is, the fresh air and the blow-by gas flow out of the valve chamber cover 12, enter the oil-gas separator 6 through the first end 61, are sequentially filtered by the first filter screen 63 and the second filter screen 64, and the fine droplets are adsorbed on the first filter screen 63 and the second filter screen 64 and are collected at the bottom of the oil-gas separator 6 under the action of gravity. The filtered gas becomes cleaner and enters the vent pipe 5 through the second end 62.
In this embodiment, the supercharged engine crankcase ventilation system further comprises an oil return pipe 7, the oil-gas separator 6 is provided with a third end 65, the third end 65 is located at the bottom of the oil-gas separator 6, one end of the oil return pipe 7 is communicated with the third end 65, and the other end of the oil return pipe 7 is communicated to the crankcase 1 in a one-way mode. The lubricating oil collected at the bottom of the gas-oil separator 6 can be returned into the crankcase 1, so that the oil content in the crankcase 1 is prevented from being reduced, and the lubrication is facilitated.
Further, the supercharged engine crankcase ventilation system also comprises a first one-way valve 8, and the first one-way valve 8 is arranged on the oil return pipe 7. The first check valve 8 prevents gas and liquid in the crankcase 1 from flowing into the oil return pipe 7, so that ventilation is facilitated.
If the water content in the filtered lubricating oil is more, an oil-water separator can be arranged between the first check valve 8 and the crankcase 1, and liquid water in the lubricating oil is filtered and then flows back into the crankcase 1. That is, the lubricating oil collected at the bottom of the gas-oil separator 6 passes through the oil return pipe 7, the oil-water separator, and the first check valve 8 in this order, and finally returns to the crankcase 1.
In the present embodiment, the breather pipe 5 has the first vent hole 51 and the second vent hole 52, the first vent hole 51 and the second vent hole 52 communicate with each other, the first vent hole 51 communicates with the second end 62, and the second vent hole 52 communicates with the air outlet end 32 in one direction. When the engine works at idle speed or in a light load, the gas filtered by the oil-gas separator 6 flows in from the first vent hole 51, flows out from the second vent hole 52, enters the gas outlet end 32 and then enters the combustion chamber for combustion.
The supercharged engine crankcase ventilation system further comprises a second one-way valve 9, and the breather pipe 5 is connected with the air outlet end 32 through the second one-way valve 9, namely, the air flowing through the second breather port 52 can only flow into the air outlet end 32 in one direction. The second check valve 9 prevents the gas flowing through the gas outlet end 32 from flowing into the ventilation pipe 5, so that ventilation is facilitated.
The vent pipe 5 further has a third vent 53, the third vent 53 is respectively communicated with the boost inlet 21 and the first vent 51, and the third vent 53 is communicated with the boost inlet 21 in one direction.
The supercharged engine crankcase ventilation system further comprises a third one-way valve 10, and the breather pipe 5 is connected with the supercharged air inlet 21 through the third one-way valve 10, namely, the gas flowing through the third one-way valve 10 can only flow into the supercharged air inlet 21 in one direction. The third check valve 10 is provided to prevent gas flowing through the boost inlet 21 from flowing into the breather pipe 5. When the engine is operated at a high speed or under a heavy load, the gas filtered by the gas-oil separator 6 flows in from the first port 51, flows out from the third port 53, enters the supercharged air inlet 21, and reenters the combustion chamber for combustion.
The working process of the supercharged engine crankcase ventilation system provided by the embodiment is as follows:
when the engine works at idle speed or low load, the supercharger 2 does not work, the opening degree of the throttle valve 3 is small, namely, the pressure difference between the air inlet end 31 and the air outlet end 32 is large, and the vacuum degree of the air outlet end 32 is high. After being filtered by the air filter 13, the atmospheric air enters from the pressurized air inlet 21, sequentially passes through the pressurized air outlet 22, the air supply pipe 4 and the valve chamber cover 12, and meets the blowby gas of the crankcase 1 in the valve chamber cover 12. The mixed gas flows out of the valve chamber cover 12 and enters the oil-gas separator 6 through the purge pipe 14 and the first end 61 in sequence. The lubricant and moisture of the mixed gas are filtered by the first filter 63 and the second filter 64, and the filtered gas enters the vent pipe 5 through the second end 62 and the first vent hole 51. Due to the high vacuum degree of the gas outlet end 32, the second one-way valve 9 is opened, and the gas passes through the gas outlet end 32 and enters the combustion chamber for combustion. The oil is filtered in the gas-oil separator 6 and returned to the crankcase 1 through the oil return pipe 7.
When the engine speed or load is increased, the supercharger 2 works, the opening degree of the throttle valve 3 is increased, namely the pressure difference between the air inlet end 31 and the air outlet end 32 is reduced, the atmospheric air enters from the supercharging air inlet 21 after being filtered by the air filter 13, the pressure is increased after being supercharged by the supercharger 2, and the fresh air enters the crankcase 1 from the supercharging air outlet 22, the air supplementing pipe 4 and the valve chamber cover 12 to drive and sweep the blowby gas inside. The mixed gas flows out of the valve chamber cover 12 and enters the oil-gas separator 6 through the purge pipe 14 and the first end 61 in sequence. The lubricant and moisture of the mixed gas are filtered by the first filter 63 and the second filter 64, and the filtered gas enters the vent pipe 5 through the second end 62 and the first vent hole 51. Due to the pressure difference between the third check valve 53 and the boost air inlet 21, the third check valve 10 is opened, and the mixture gas passes through the boost air inlet 21 and flows out from the boost air outlet 22. The gas flowing out of the supercharged gas outlet 22 passes through the intercooler 11 and the throttle valve 3 in sequence and finally enters the combustion chamber for combustion.
It should be noted that the foregoing is only a preferred embodiment of the present invention and the technical principles applied. It will be understood by those skilled in the art that the present invention is not limited to the particular embodiments described herein, but is capable of various obvious changes, rearrangements and substitutions as will now become apparent to those skilled in the art without departing from the scope of the invention. Therefore, although the present invention has been described in greater detail with reference to the above embodiments, the present invention is not limited to the above embodiments, and may include other equivalent embodiments without departing from the scope of the present invention.
Claims (9)
1. A supercharged engine crankcase ventilation system, comprising:
a crankcase (1);
a supercharger (2) comprising a boost air inlet (21) and a boost air outlet (22), the boost air inlet (21) being communicable with the atmosphere;
a throttle valve (3) comprising an air inlet end (31) and an air outlet end (32), the air inlet end (31) being communicable with the supercharged air outlet (22), the air outlet end (32) being configured to be communicable with a combustion chamber;
one end of the air supplementing pipe (4) is communicated with the supercharging air outlet (22), and the other end of the air supplementing pipe can be communicated with the crankcase (1);
the breather pipe (5) can be communicated with the crankcase (1), and the breather pipe (5) can be respectively communicated to the pressurization air inlet (21) and the air outlet end (32) in a single direction.
2. The supercharged engine crankcase ventilation system of claim 1, further comprising an air-oil separator (6), the air-oil separator (6) having a first end (61) and a second end (62), the first end (61) being communicable with the crankcase (1) and the second end (62) being communicable with the breather pipe (5).
3. Supercharged engine crankcase ventilation system according to claim 2, characterized in that a first sieve (63) is provided in the gas-oil separator (6).
4. 4, the supercharged engine crankcase ventilation system of claim 3, characterized in that a second screen (64) is further provided in the gas-oil separator (6), and in the direction of the air flow, the first screen (63) and the second screen (64) are provided in the gas-oil separator (6) in sequence, and the aperture of the first screen (63) is larger than that of the second screen (64).
5. The supercharged engine crankcase ventilation system of claim 2, further comprising an oil return pipe (7), wherein the oil-gas separator (6) has a third end (65), wherein one end of the oil return pipe (7) is communicated with the third end (65), and the other end of the oil return pipe (7) is communicated to the crankcase (1) in a single direction.
6. The supercharged engine crankcase ventilation system of claim 5, further comprising an oil-water separator disposed on the oil return pipe (7).
7. The supercharged engine crankcase ventilation system of claim 5, further comprising a first check valve (8), the first check valve (8) being disposed on the oil return tube (7).
8. The supercharged engine crankcase ventilation system of claim 1, further comprising a second one-way valve (9), the breather tube (5) being connected to the outlet port (32) via the second one-way valve (9).
9. The supercharged engine crankcase ventilation system of claim 1, further comprising a third one-way valve (10), the breather tube (5) being connected to the supercharged air inlet (21) via the third one-way valve (10).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921953657.4U CN210977631U (en) | 2019-11-12 | 2019-11-12 | Supercharged engine crankcase ventilation system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921953657.4U CN210977631U (en) | 2019-11-12 | 2019-11-12 | Supercharged engine crankcase ventilation system |
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| Publication Number | Publication Date |
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| CN210977631U true CN210977631U (en) | 2020-07-10 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201921953657.4U Active CN210977631U (en) | 2019-11-12 | 2019-11-12 | Supercharged engine crankcase ventilation system |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114776414A (en) * | 2022-04-29 | 2022-07-22 | 中国北方发动机研究所(天津) | Oil-gas separation structure |
| CN116398272A (en) * | 2023-06-09 | 2023-07-07 | 潍柴动力股份有限公司 | Crankcase ventilation system and control method thereof |
-
2019
- 2019-11-12 CN CN201921953657.4U patent/CN210977631U/en active Active
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114776414A (en) * | 2022-04-29 | 2022-07-22 | 中国北方发动机研究所(天津) | Oil-gas separation structure |
| CN116398272A (en) * | 2023-06-09 | 2023-07-07 | 潍柴动力股份有限公司 | Crankcase ventilation system and control method thereof |
| CN116398272B (en) * | 2023-06-09 | 2023-11-07 | 潍柴动力股份有限公司 | Crankcase ventilation system and control method thereof |
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