CN110219715B

CN110219715B - Closed circulation respiratory and car

Info

Publication number: CN110219715B
Application number: CN201910501046.4A
Authority: CN
Inventors: 秦伟; 王贵琛; 蔡海杰
Original assignee: Weichai Power Co Ltd
Current assignee: Weichai Power Co Ltd
Priority date: 2019-06-11
Filing date: 2019-06-11
Publication date: 2021-12-21
Anticipated expiration: 2039-06-11
Also published as: CN110219715A

Abstract

The invention belongs to the technical field of vehicles and discloses a closed cycle breathing system and an automobile. The closed cycle respiratory system includes: the oil-gas separator is communicated with a crankcase of the engine, the other end of the oil-gas separator is communicated with an air inlet pipeline through an air outlet pipeline, the air inlet pipeline is communicated with the supercharger, and the supercharger is communicated with the engine; the inlet end of the bypass pipeline is communicated with the air outlet pipeline, and the outlet end of the bypass pipeline is respectively communicated with the supercharger and the engine; and the check valve is arranged on the bypass pipeline and is configured to be selectively opened, so that the gas separated by the oil-gas separator can flow back into the engine through the bypass pipeline and is used for relieving the pressure of the crankcase. The closed circulation breathing system is simple and reliable in structure, reduces the risk that the engine is damaged due to sudden increase of the pressure of the engine, realizes effective protection on the engine, and prolongs the service life of the engine.

Description

Closed circulation respiratory and car

Technical Field

The invention relates to the technical field of vehicles, in particular to a closed cycle breathing system and an automobile.

Background

In the automobile industry, the breathing and ventilation system of an engine is generally divided into a closed circulation breathing system and an open circulation breathing system, wherein the closed circulation breathing system means that oil gas separated by an oil-gas separator is not directly discharged into the atmosphere, but is connected to an air inlet pipeline in front of a supercharger through an air outlet pipeline, and then enters the engine again.

For an engine running in a cold region, if a closed cycle breathing system is adopted, when the engine is stopped for a long time and then started, the condition of icing at the joint between the air outlet pipeline of the oil-gas separator and the air inlet pipeline of the supercharger often occurs. Because the position of freezing is inside the pipeline, be difficult to the discovery, if direct start, even when the idling operation, the discharge of gaseous in the gas outlet pipe way of oil and gas separator can be blockked up to the position of freezing for the crankcase pressure of engine increases suddenly, leads to adding oil jet and the rule of an oil by trouble such as ejecting, thereby damages the engine, shortens the life of engine.

Disclosure of Invention

The invention aims to provide a closed cycle breathing system and an automobile, which can avoid the condition that an engine is damaged due to icing of a pipeline and prolong the service life of the engine.

In order to achieve the purpose, the invention adopts the following technical scheme:

a closed cycle respiratory system comprising: the engine, oil and gas separator and booster, oil and gas separator's one end communicate in the crankcase of engine, the other end is linked together through giving vent to anger pipeline and air inlet pipeline, air inlet pipeline communicate in the booster, the booster communicates in the cylinder of engine still includes:

the inlet end of the bypass pipeline is communicated with the gas outlet pipeline, and the outlet end of the bypass pipeline is respectively communicated with the supercharger and the engine;

and the check valve is arranged on the bypass pipeline and is configured to be selectively opened, so that the oil gas separated by the oil-gas separator can flow back into the engine through the bypass pipeline for pressure relief of the crankcase.

Preferably, the engine further comprises an intake air heater, one end of the intake air heater is communicated with the supercharger, and the other end of the intake air heater is communicated with the engine and the bypass pipeline respectively.

Preferably, the intake air heater and the engine are communicated through a first pipeline, and the first pipeline is communicated with the bypass pipeline.

Preferably, the tube diameter of the first pipe line gradually decreases toward the engine.

Preferably, the air flow in the first pipeline and the air flow in the bypass pipeline are arranged at an acute angle at the connection between the first pipeline and the bypass pipeline.

Preferably, an outlet end of the bypass line is disposed at a position of the first line near the intake air heater so that the gas heated by the intake air heater can heat the check valve.

Preferably, the supercharger and the intake air heater are communicated through a second pipeline.

Preferably, the air cleaner is arranged at the inlet of the air inlet pipeline.

Preferably, the supercharger comprises a gas compressor, a connecting shaft and a turbine, two ends of the connecting shaft are respectively connected to the gas compressor and the turbine, and the gas compressor and the turbine are both communicated with the engine.

In order to achieve the purpose, the invention further provides an automobile which comprises the closed cycle breathing system.

The invention has the beneficial effects that:

according to the closed circulation breathing system provided by the invention, the bypass pipeline is arranged, one end of the bypass pipeline is communicated with the gas outlet pipeline, the other end of the bypass pipeline is respectively communicated with the supercharger and the engine, and the bypass pipeline plays a role in relieving pressure of gas in a crankcase in the engine. The one-way valve is arranged on the bypass pipeline and is configured to be selectively opened, and the one-way valve is used for controlling the on-off of the bypass pipeline under different working conditions.

When the engine is used in a cold place, if the shutdown time of the engine is too long, the connecting position between the gas outlet pipeline and the gas inlet pipeline of the oil-gas separator can be frozen due to residual condensed water, at the moment, if the engine is directly started, even when the engine runs at idle speed, the freezing position can block the discharge of gas in the gas outlet pipeline of the oil-gas separator, so that the pressure of the gas entering the engine through a supercharger is lower, the pressure of the inlet end of the bypass pipeline is higher than that of the outlet end, at the moment, a pressure difference exists between the inlet end and the outlet end of the bypass pipeline, the pressure difference opens the one-way valve, the gas separated by the oil-gas separator can flow back into the engine through the bypass pipeline, the pressure relief of a crankcase is realized, the structure is simple and reliable, and the risk that the crankcase is damaged due to the sudden increase of the pressure of the crankcase is reduced, the engine is effectively protected, and the service life of the engine is prolonged.

After idling for a period of time, the engine works normally, because the oil gas with higher engine temperature enters the air outlet pipeline after passing through the oil-gas separator and directly contacts with the icing position, the icing position can be slowly melted after the engine vibration is added, the gas in the air outlet pipeline of the oil-gas separator can be smoothly discharged, and the gas is mixed with the air in the air inlet pipeline and then is introduced into the supercharger for pressurization, so that the pressure at the outlet end of the bypass pipeline is greater than the pressure at the inlet end of the bypass pipeline, and the check valve is closed and cannot be opened. By adopting the arrangement, the gas in the engine can not flow back to the oil-gas separator through the bypass pipeline, and the requirement of normal use of the engine is met.

The embodiment also provides an automobile which comprises the closed cycle breathing system. The engine avoids the faults that the engine oil is sprayed from the engine oil port and the engine oil rule is ejected out and the like due to sudden increase of the pressure of the engine when a pipeline is frozen, the protection of the engine is realized, and the service cycle of the engine is prolonged.

Drawings

FIG. 1 is a schematic diagram of the construction of a closed cycle respiratory system of the present invention;

fig. 2 is a schematic diagram of the structure of the first circuit and the check valve in the closed cycle breathing system of the present invention.

In the figure:

1. an engine; 2. an oil-gas separator; 3. a supercharger; 4. an air outlet pipeline; 5. an air intake line; 6. a bypass line; 7. a one-way valve; 8. an intake air heater; 9. a first pipeline; 10. a second pipeline; 11. an air cleaner; 12. an exhaust line;

31. a compressor; 32. a connecting shaft; 33. a turbine;

61. an inlet end; 62. and (4) an outlet end.

Detailed Description

In order to make the technical problems solved, technical solutions adopted and technical effects achieved by the present invention clearer, the technical solutions of the embodiments of the present invention will be described in further detail below with reference to the accompanying drawings, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

In the description of the present invention, unless expressly stated or limited otherwise, the terms "connected," "connected," and "fixed" are to be construed broadly, e.g., as meaning permanently connected, removably connected, or integral to one another; can be mechanically or electrically connected; either directly or indirectly through intervening media, either internally or in any other relationship. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.

In the present invention, unless otherwise expressly stated or limited, "above" or "below" a first feature means that the first and second features are in direct contact, or that the first and second features are not in direct contact but are in contact with each other via another feature therebetween. Also, the first feature being "on," "above" and "over" the second feature includes the first feature being directly on and obliquely above the second feature, or merely indicating that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature includes the first feature being directly under and obliquely below the second feature, or simply meaning that the first feature is at a lesser elevation than the second feature.

The technical scheme of the invention is further explained by the specific implementation mode in combination with the attached drawings.

The embodiment provides a closed cycle breathing system, which is mainly used for protecting an engine when a pipeline is frozen. As shown in fig. 1, the closed cycle breathing system includes an engine 1, an oil-gas separator 2, a supercharger 3, an air filter 11, a bypass pipeline 6 and a check valve 7, wherein one end of the oil-gas separator 2 is communicated with a crankcase of the engine 1, the other end of the oil-gas separator is communicated with an air inlet pipeline 5 through an air outlet pipeline 4, the air filter 11 is arranged at an inlet of the air inlet pipeline 5, so that one end of the supercharger 3 is communicated with the air filter 11 through the air inlet pipeline 5, and the other end of the supercharger 3 is communicated with a cylinder of the engine 1.

When the engine works normally, after air is introduced into the air filter 11, the air filter 11 introduces the filtered clean air into the supercharger 3 through the air inlet pipeline 5, the air is compressed by the supercharger 3 to improve the density of the air, so that more air is filled into the cylinder of the engine 1, and the power of the engine is increased. Wherein, the waste gas that the gas combustion produced can let in booster 3, and the high temperature high pressure gas that burns in the cylinder can scurry into the crankcase along the clearance between piston assembly and the cylinder wall, and oil and gas separator just installs in crankcase ventilation mechanism's passageway for carry out oil-gas separation to the waste gas that scurries into the crankcase, gas after the separation is in flowing into inlet line 5 through gas outlet line 4, in this gas and clean air mix the back reentrant engine 1 through booster 3 pressure boost again.

The closed circulation respiratory system that this embodiment provided, through setting up bypass line 6, bypass line 6's one end communicates in gas outlet pipe way 4, and the other end sets up between booster 3 and engine 1 and is linked together with booster 3 and engine 1 respectively, and bypass line 6 has played the effect of carrying out the pressure release to the gas in the crankcase. The check valve 7 is configured to be selectively opened by providing the check valve 7 on the bypass line 6, and the check valve 7 is used for controlling the on-off of the bypass line 6 under different working conditions.

Specifically, when the engine is used in a cold area, if the engine is stopped for too long, the connecting position between the outlet pipeline 4 of the oil-gas separator 2 and the inlet pipeline 5 behind the air filter 11 can be frozen due to the residual condensed water, at this time, if the engine is directly started, even when the engine is in idle running, the frozen position can block the discharge of gas in the outlet pipeline 4, so that the pressure of the crankcase of the engine 1 is higher, the pressure of the gas entering the engine 1 through the supercharger 3 is lower for the unloaded running, the pressure of the inlet end 61 of the bypass pipeline 6 is higher than that of the outlet end 62, at this time, a pressure difference exists between the inlet end 61 and the outlet end 62 of the bypass pipeline 6, the pressure difference opens the check valve 7, so that the oil gas in the oil-gas separator 2 can flow back to the crankcase of the engine 1 through the bypass pipeline 6, and the pressure relief of the crankcase of the engine 1 is realized, simple structure is reliable, has reduced the sudden grow of crankcase pressure and has damaged the risk of engine, has realized the effective protection to the engine, prolongs the life of engine.

After idling operation for a period of time, the engine normally works, because the higher oil gas of temperature in the engine 1 enters into the air outlet pipeline 4 and directly contacts with the position of freezing after the oil-gas separator 2, add the engine vibration, the department of freezing can slowly melt, gas can be discharged smoothly in the air outlet pipeline 4, this gas mixes the back with the clean air of accomplishing through air cleaner 11 filtration, let in pressurizer 3 in and pressurize, make the pressure that is located the exit end 62 of bypass pipeline 6 be greater than the pressure of bypass pipeline 6 entrance point 61, check valve 7 closes, can not open. With the arrangement, gas in the engine 1 cannot flow back to the oil-gas separator 2 through the bypass pipeline 6, so that the requirement of normal use of the engine is met.

Further, as shown in fig. 1, the supercharger 3 includes a compressor 31, a connecting shaft 32 and a turbine 33, two ends of the connecting shaft 32 are respectively connected to the compressor 31 and the turbine 33, and both the compressor 31 and the turbine 33 are communicated with the engine 1. Specifically, one end of the compressor 31 is communicated with the air cleaner 11 through the air inlet pipeline 5, the other end is communicated with the engine 1, the compressor 31 is used for supercharging clean air, and the turbine 33 is communicated with the engine 1 through the exhaust pipeline 12 and used for discharging exhaust gas in the engine 1.

If the engine is in a cold state for a long time, the check valve 7 may be stuck due to condensation of condensed water, and in order to solve the problem, as shown in fig. 1, the closed cycle breathing system further includes an air inlet heater 8, one end of the air inlet heater 8 is communicated with the supercharger 3, the other end is respectively communicated with the engine 1 and the bypass pipeline 6, the air inlet heater 8 is used for preheating the gas pressurized by the supercharger 3, so as to ensure that the gas entering the engine 1 is in a proper working temperature range, improve the cold start of the engine, and simultaneously before the engine is started, the heat of the air inlet heater 8 can be transferred to the check valve 7, thereby increasing the self temperature of the check valve 7 and preventing the check valve 7 from being stuck.

Specifically, the air inlet heater 8 is communicated with the engine 1 through a first pipeline 9, the supercharger 3 is communicated with the air inlet heater 8 through a second pipeline 10, the first pipeline 9 is communicated with the bypass pipeline 6, so that air pressurized by the supercharger 3 flows into the air inlet heater 8 through the second pipeline 10, the air inlet heater 8 is used for heating the air, the heated air is divided into two branches, one branch directly enters the engine 1 through the first pipeline 9, and the other branch is contacted with the check valve 7 sequentially through the first pipeline 9 and the bypass pipeline 6.

Wherein the exit end 62 of the bypass pipeline 6 is arranged at the position close to the air intake heater 8, so that the distance between the air intake heater 8 and the check valve 7 is relatively close, the heat preheated by the air intake heater 8 can be transferred to the check valve 7, the check valve 7 is prevented from being blocked due to condensed water, and the normal work of the check valve 7 is ensured. Further, the check valve 7 may be disposed at a position close to the outlet end 62 of the bypass line 6, effectively shortening the distance between the intake air heater 8 and the check valve 7, so that the heat of the gas heated by the intake air heater 8 and flowing out from the intake air heater 8 can heat the check valve 7 more rapidly.

Because the bypass pipeline 6 is communicated with the first pipeline 9, the gas in the bypass pipeline 6 needs to be mixed with the pressurized gas in the first pipeline 9 and then enters the engine 1, in order to reduce the mutual influence of the gas in the bypass pipeline 6 and the pressurized gas in the first pipeline 9 in the inflow direction, the gas flow in the first pipeline 9 and the gas flow in the bypass pipeline 6 are arranged at the connecting part between the first pipeline 9 and the bypass pipeline 6 in an acute angle, so that the gas in the bypass pipeline 6 can conform to the inflow direction of the pressurized gas in the first pipeline 9, and the influence of the resistance to the inflow of the pressurized gas is reduced.

It will be appreciated that if the first conduit 9 is disposed at an obtuse angle to the outlet end 62 of the bypass conduit 6, the component force of the gas in the bypass conduit 6 along the first conduit 9 and the flow direction of the pressurized gas will tend to be opposite, and the gas in the bypass conduit 6 and the pressurized gas in the first conduit 9 will interfere with each other, and the resistance generated by the two will prevent the gas from flowing into the engine 1. Therefore, the first pipeline 9 and the outlet end 62 of the bypass pipeline 6 are arranged at an acute angle, so that the supercharged gas in the first pipeline 9 and the gas in the bypass pipeline 6 can smoothly flow into the cylinder of the engine 1, the gas in the crankcase of the engine 1 can be smoothly discharged by the bypass pipeline 6, the pressure relief is realized, and the normal operation of the engine is ensured.

As shown in fig. 1-2, in order to ensure that the check valve 7 can be normally opened, the first pipeline 9 is set to be of a horn structure, a small opening end of the first pipeline 9 is communicated with the engine 1, and a large opening end of the first pipeline 9 is connected with the air intake heater 8, that is, the diameter of the first pipeline 9 gradually decreases toward the direction close to the engine 1. Through setting up first pipeline 9 for the structure that the cross-section shrinks gradually, when supercharged gas is when first pipeline 9, because the cross-section of first pipeline 9 diminishes gradually, supercharged gas's velocity of flow increases, gets into the supercharged gas in the engine 1 promptly and accelerates, then the pressure in first pipeline 9 diminishes, and the supercharged gas through first pipeline 9 can play an injection effect to the oil gas of bypass line 6 this moment. As the pressure in the first pipeline 9 becomes lower, the pressure at the outlet end 62 of the bypass pipeline 6 is also reduced, and the pressure difference between the two ends of the check valve 7 is increased, so that the check valve 7 is easier to open at idle speed, and the normal operation of the check valve 7 is ensured.

The working engineering of the closed cycle breathing system provided by this embodiment is as follows:

when the engine is used in a cold region, the connecting position between the air outlet pipeline 4 of the oil-gas separator 2 and the air inlet pipeline 5 of the air filter 11 can be frozen due to residual condensed water, at the moment, if the engine is directly started, the freezing position can block the air outlet pipeline 4 of the oil-gas separator 2 to obstruct the discharge of gas, so that the pressure of the engine 1 is larger, for the operation without load, the gas filtered by the air filter 11 enters the compressor 31 of the supercharger 3 through the air inlet pipeline 5 to be compressed, then the pressurized gas flows into the air inlet heater 8 through the second pipeline 10 to be preheated, the heated gas is divided into two branches, wherein one branch directly enters the engine 1 through the first pipeline 9, the other branch is contacted with the one-way valve 7 through the first pipeline 9 and the bypass pipeline 6 in sequence, for the operation without load, at this time, the pressure of the pressurized gas passing through the compressor 31 of the supercharger 3 is low, the section of the first pipeline 9 is gradually reduced, the flow rate of the pressurized gas is increased, the pressure in the first pipeline 9 is reduced, the pressure of the inlet end 61 of the bypass pipeline 6 is greater than the pressure of the outlet end 62, so that the one-way valve 7 is opened, the gas separated by the oil-gas separator 2 can sequentially flow back into the engine 1 through the bypass pipeline 6 and the first pipeline 9, the pressure relief of a crankcase of the engine 1 is realized, and finally, the exhaust gas in the engine 1 enters the turbine 33 of the supercharger 3 through the exhaust pipeline 12 and is used for exhaust gas emission;

after idling for a period of time, the engine works normally, because the higher oil gas of engine 1 temperature enters into the air outlet pipeline 4 and directly contacts with the icing position after passing through the oil-gas separator 2, the vibration of the engine is added, the icing position can be melted slowly, the gas in the air outlet pipeline 4 of the oil-gas separator 2 can be discharged smoothly, the gas is mixed with the clean air filtered and finished by the air filter 11 and then is led into the supercharger 3 for pressurization, so that the pressure at the outlet end 62 of the bypass pipeline 6 is greater than the pressure at the inlet end 61 of the bypass pipeline 6, and the check valve 7 is closed and cannot be opened.

The embodiment also provides an automobile which comprises the closed cycle breathing system. The engine avoids the faults that the engine oil is sprayed from the engine oil port and the engine oil rule is ejected out and the like due to the sudden increase of the pressure of the engine 1 when a pipeline is frozen, the protection of the engine is realized, and the service cycle of the engine is prolonged.

In the description herein, it is to be understood that the terms "upper", "lower", "right", and the like are based on the orientations and positional relationships shown in the drawings and are used for convenience in description and simplicity in operation, but do not indicate or imply that the referenced devices or elements must have a particular orientation, be constructed in a particular orientation, and be constructed in a particular operation, and thus should not be construed as limiting the present invention. Furthermore, the terms "first" and "second" are used merely for descriptive purposes and are not intended to have any special meaning.

In the description herein, references to the description of "an embodiment," "an example" or the like are intended to mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example.

In addition, the foregoing is only the 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 by the above embodiments, the present invention is not limited to the above embodiments, and may include other equivalent embodiments without departing from the spirit of the present invention, and the scope of the present invention is determined by the scope of the appended claims.

Claims

1. A closed cycle respiratory system comprising: engine (1), oil and gas separator (2) and booster (3), the one end intercommunication of oil and gas separator (2) in the crankcase of engine (1), the other end is linked together through giving vent to anger pipeline (4) and air inlet pipeline (5), air inlet pipeline (5) communicate in booster (3), booster (3) communicate in the cylinder of engine (1), its characterized in that still includes:

the inlet end (61) of the bypass pipeline (6) is communicated with the air outlet pipeline (4), and the outlet end (62) of the bypass pipeline (6) is respectively communicated with the supercharger (3) and the engine (1);

a check valve (7) disposed on the bypass line (6), the check valve (7) being configured to be selectively opened to enable gas separated by the gas-oil separator (2) to flow back into the engine (1) through the bypass line (6) for depressurizing the crankcase; the air inlet heater (8), one end of the air inlet heater (8) is communicated with the supercharger (3), and the other end is respectively communicated with the engine (1) and the bypass pipeline (6); the air inlet heater (8) is communicated with the engine (1) through a first pipeline (9), and the first pipeline (9) is communicated with the bypass pipeline (6); the diameter of the first pipeline (9) is gradually reduced in the direction close to the engine (1); the air flow in the first pipeline (9) and the air flow in the bypass pipeline (6) are arranged at an acute angle at the joint between the first pipeline (9) and the bypass pipeline (6); the outlet end (62) of the bypass line (6) is arranged in the first line (9) close to the inlet heater (8) so that the gas heated by the inlet heater (8) can heat the non-return valve (7).

2. The closed cycle breathing system of claim 1, wherein the supercharger (3) and the intake air heater (8) are in communication via a second conduit (10).

3. The closed cycle respiratory system of claim 1, further comprising an air filter (11), the air filter (11) being disposed at an inlet of the intake conduit (5).

4. The closed-cycle breathing system of claim 1, wherein the supercharger (3) comprises a compressor (31), a connecting shaft (32) and a turbine (33), both ends of the connecting shaft (32) are respectively connected to the compressor (31) and the turbine (33), and the compressor (31) and the turbine (33) are both communicated with the engine (1).

5. An automobile comprising the closed cycle breathing system of any one of claims 1-4.