CN112302834A

CN112302834A - Fuel oil evaporation system and oil vapor circulation method thereof

Info

Publication number: CN112302834A
Application number: CN202011034240.5A
Authority: CN
Inventors: 高剑; 高健峰; 严丁刘; 于坤; 刘春宁; 毛成思; 李扬眉; 吴彦震; 马庶; 诸旻; 马明杰; 杨建丰; 岳贵成
Original assignee: Shanghai Chinaust Automotive Plastics Corp ltd
Current assignee: Shanghai Chinaust Automotive Plastics Corp ltd
Priority date: 2020-09-27
Filing date: 2020-09-27
Publication date: 2021-02-02
Anticipated expiration: 2040-09-27
Also published as: CN112302834B

Abstract

The application discloses a fuel oil evaporation system and an oil steam circulation method thereof, which comprises an air inlet component, an oil-gas separator and a guide component, wherein the air inlet component forms an air supply port, the oil inlet component forms an oil supply port, the gas-liquid separator is provided with a bottom wall, a side wall and a top wall, the inner side of the side wall, the inner side of the bottom wall and the bottom wall form a separation chamber, the top wall is hermetically covered on the separation chamber, the side wall is provided with at least one inlet and one outlet, the guide component comprises a guide pipe and a desorption pump, the guide pipe is provided with an inlet and an outlet, the desorption pump is communicated with the guide pipe, the guide pipe is provided with a first pipe part communicated with the inlet and a second pipe part communicated with the outlet, the inlet formed at one end of the first pipe part is simultaneously communicated with the air supply port and the oil supply port, and the other end is communicated with the inlet in a mode of guiding the guided air flow into, one end of the second pipe portion forms the outlet and the other end is communicated with the outlet.

Description

Fuel oil evaporation system and oil vapor circulation method thereof

Technical Field

The invention relates to an oil-gas evaporation system applied to a vehicle, in particular to a fuel oil evaporation system and an oil-gas circulation method thereof.

Background

With the improvement of living standard, the family car is gradually popularized in middle and small families. To meet the demands of users, existing automobile designers are improving the performance of automobiles, especially the user experience and the durability of automobiles.

This is true not only for cars, but also for other types of fuel vehicles. During the running of a fuel-powered vehicle, a user hears noise, which is generated by various sources, such as the friction between the tires of the vehicle and the ground, the friction between various parts in the engine of the vehicle, and the like. In addition, the circulation of oil and gas in the oil and gas conducting system of the vehicle in the pipeline can generate larger noise.

Obviously, such drawbacks are not tolerable to the user. Furthermore, since the path of circulation, in particular in the ducts, is along the direction in which the ducts extend, the direction in which the ducts extend is very strange during the design of the vehicle, in particular in the vapor-evaporation system of the vehicle.

The oil gas vaporization system comprises an activated carbon tank, a valve body, an air inlet assembly and an oil inlet assembly. An active desorption pump is also included in the evaporative fuel control (EVAP). After the oil-gas evaporation system works for a preset time, the whole oil-gas evaporation system is in a high-heat state (namely a heat engine state), some gaseous fuel oil does not flow back in time, and the valve body is closed. After the oil vapor evaporation system is converted into a cooling state (namely, a cold state) for a preset time, some oil drops are solidified on the inner wall of the pipeline, and some oil drops can enter the active desorption pump. The oil drops solidified on the inner wall of the pipeline can not only block the gas subsequently filled into the oil-gas evaporation system, but also increase the noise. So for a long time, the oil that gets into in the active desorption pump drips and not only can make the life-span of active desorption pump reduce, but also can make some lubricating oil such as in the active desorption pump have the chance to be taken away by oil to make the frictional force increase between each part in the active desorption pump, and then produce great noise, long-term work can cause desorption pump stall, arouses the ECU warning, and the vehicle shows the trouble sign indicating number, needs to change the desorption pump and handles.

More importantly, the fuel can be more fully utilized only when more oil vapor formed by evaporation of the oil-gas evaporation system enters a combustion chamber of the internal combustion engine for combustion. Once too much fuel enters the engine to be combusted in the form of liquid fuel, insufficient combustion of the fuel can be caused, so that not only the fuel consumption of the internal combustion engine is increased, but also more exhaust gas is generated, and the energy conservation and environmental protection conflict with the energy conservation and environmental protection advocated by the state at present is achieved.

Disclosure of Invention

An object of the present invention is to provide a fuel evaporation system and a fuel vapor circulation method thereof, in which a gas-liquid separator is provided in the fuel evaporation system, wherein the gas-liquid separator is capable of guiding the circulation of gas in the fuel evaporation system to reduce noise generated from the fuel evaporation system.

Another object of the present invention is to provide a fuel evaporation system and a fuel vapor circulation method thereof, wherein the gas-liquid separator of the fuel evaporation system can extend a path for gas circulation of the fuel evaporation system, so that fuel vapor in a gaseous state in a heat engine state in the fuel evaporation system can be retained, thereby preventing the fuel vapor from entering other parts and adhering to an inner wall of a pipeline.

Another object of the present invention is to provide a fuel evaporation system and a fuel vapor circulation method thereof, wherein the gas-liquid separator of the fuel evaporation system can prevent excessive oil gas from entering the active desorption pump during the conversion process between a heat engine and a cold engine, so as to prolong the service life of the active desorption pump.

Another object of the present invention is to provide a fuel evaporation system and a fuel vapor circulation method thereof, wherein the gas-liquid separator of the fuel evaporation system can separate liquid from oil by centrifugation, thereby avoiding waste of fuel.

Another object of the present invention is to provide a fuel evaporation system and a fuel vapor circulation method thereof, in which the gas-liquid separator of the fuel evaporation system can separate liquid and oil, and can recover the separated liquid oil, thereby improving the utilization efficiency of fuel.

Another object of the present invention is to provide a fuel evaporation system and a fuel vapor circulation method thereof, in which the gas-liquid separator of the fuel evaporation system can generate high-frequency vibration of gas inside the gas-liquid separator, thereby preventing oil droplets from adhering to the gas-liquid separator.

To achieve at least one of the above objects of the present invention, there is provided a fuel evaporation system, wherein the fuel evaporation system includes:

the air inlet assembly is provided with an air inlet and an air outlet, wherein the air inlet is used for communicating with the oxygen supply space;

the oil inlet assembly is provided with an oil inlet and an oil delivery port, wherein the oil inlet is communicated with a fuel tank;

a gas-liquid separator having a bottom wall, a side wall extending upward from the bottom wall, and a top wall, wherein the inner side of the side wall, the inner side of the bottom wall, and the bottom wall form a separation chamber, and the top wall is hermetically covered in the separation chamber, wherein the side wall is provided with at least an inlet and an outlet;

an introducing assembly, wherein the introducing assembly comprises a flow guide tube and a desorption pump, wherein the flow guide tube has an inlet and an outlet, wherein the desorption pump is communicated with the flow guide tube, wherein the flow guide tube has a first tube part communicated with the inlet and a second tube part communicated with the outlet, wherein one end of the first tube part forms the inlet, and the inlet is simultaneously communicated with the air supply port and the oil supply port, wherein the other end of the first tube part is communicated with the inlet in a manner of guiding the introduced air flow into the separation chamber from the tangential direction of the side wall, wherein one end of the second tube part forms the outlet, and wherein the other end of the second tube part is communicated with the outlet.

According to an embodiment of the invention, a vertical height of the outlet from the bottom wall is higher than a vertical height of the inlet from the bottom wall.

According to an embodiment of the present invention, the middle portion of the bottom wall extends upward to form an airflow baffle, wherein a liquid storage area is formed between the outer wall of the airflow baffle and the inner wall of the side wall and the bottom wall.

According to an embodiment of the present invention, a height of a top end of the airflow baffle relative to the bottom wall is higher than a height of the inlet provided in the side wall.

According to an embodiment of the invention, at least one partition is provided at the bottom wall between the outer wall of the airflow barrier and the inner wall of the side wall.

According to an embodiment of the invention, the gas flow baffle is implemented as a tube, and the top wall is provided with a flow guide tube, wherein one end of the flow guide tube is communicated with the outlet, and wherein the other end of the flow guide tube integrally extends into the passage of the tube-shaped gas flow baffle and is communicated with the separation chamber.

According to an embodiment of the present invention, an inlet joint and an outlet joint are respectively disposed on an outer wall of the gas-liquid separator, one end of the inlet joint is communicated with the inlet, the other end of the inlet joint is hermetically abutted to the first pipe portion, and one end of the outlet joint forms the outlet and is communicated with the second pipe portion.

According to an embodiment of the invention, the direction in which the inlet connection extends is implemented along a tangential direction of the side wall.

According to another aspect of the present invention to achieve at least one of the above objects, there is provided a vapor cycle method of a fuel evaporation system, wherein the vapor cycle method of the fuel evaporation system comprises the steps of:

(S1) introducing oil vapor in a direction tangential to an inner side of a sidewall of an oil vapor separator such that oil droplets in the oil vapor fall into a separation chamber formed in the oil vapor separator after the introduced oil vapor has bypassed the sidewall, thereby separating the oil vapor from the liquid oil; and

(S2) evaporating the liquid oil in the separation chamber by the oil vapor introduced into the oil-vapor separator and the high-frequency vibration generated during the movement of the oil vapor to form oil vapor to be discharged from an outlet communicating with the separation chamber.

Further objects and advantages of the invention will be fully apparent from the ensuing description.

These and other objects, features and advantages of the present invention will become more fully apparent from the following detailed description.

Drawings

Fig. 1 shows a schematic view of a fuel evaporation system according to the invention.

Fig. 2 is a perspective view showing a gas-liquid separator of the fuel evaporation system according to the present invention.

Fig. 3 shows a sectional view of an embodiment of the gas-liquid separator of the fuel evaporation system of the present invention.

Fig. 4 shows a sectional view of a second embodiment of the gas-liquid separator of the fuel evaporation system according to the present invention.

Fig. 5 shows an exploded view of a second embodiment of the gas-liquid separator of the fuel evaporation system according to the invention.

Fig. 6 shows a schematic view of a variant embodiment of the first embodiment of the gas-liquid separator of the fuel evaporation system according to the invention.

Fig. 7 is a schematic view showing the connection of a modified example of the first embodiment of the gas-liquid separator of the fuel evaporation system according to the present invention with other structures.

Fig. 8 is a schematic view showing the circulation of oil vapor after the modified example of the first embodiment of the gas-liquid separator of the fuel evaporation system according to the present invention is connected to other structures.

Detailed Description

The preferred embodiments in the following description are given by way of example only, and other obvious variations will occur to those skilled in the art. The basic principles of the invention, as defined in the following description, may be applied to other embodiments, variations, modifications, equivalents, and other technical solutions without departing from the spirit and scope of the invention.

It will be understood by those skilled in the art that in the present disclosure, the terms "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," and the like are used in an orientation or positional relationship indicated in the drawings for ease of description and simplicity of description, and do not indicate or imply that the referenced devices or components must be constructed and operated in a particular orientation and thus are not to be considered limiting.

A fuel evaporation system according to a preferred embodiment of the present invention will be described in detail below with reference to fig. 1 to 8 of the specification, wherein the fuel evaporation system can be applied to a fuel engine vehicle to introduce fuel into a fuel engine of the vehicle. It is worth mentioning that the fuel evaporation system is capable of increasing the fuel vaporization rate (the mass fraction ratio of oil vapor to liquid oil in a single volume entering the fuel engine) so that more fuel enters the fuel engine in the form of oil vapor, thereby enabling the fuel introduced through the fuel evaporation system to be more fully combusted in the fuel engine. At the same time, the exhaust gas formed by insufficient combustion of the fuel is reduced.

Referring to fig. 1 to 3, in particular, the fuel evaporation system includes an air intake assembly 10, an introduction assembly 20, an oil intake assembly 30, and a gas-liquid separator 40.

The air intake assembly 10 has an air inlet 101 and an air outlet 102. The inlet assembly 20 has an inlet 201 and an outlet 202. The oil inlet assembly 30 has an oil inlet 301 and an oil outlet 302.

The air intake assembly 10 includes at least one air intake pipe 11, wherein the air intake pipe 11 forms the air intake port 101 and the air supply port 102, and the air intake port 101 of the air intake pipe 11 is communicated with an oxygen supply space, such as the outside air. Preferably, the air intake assembly 10 further comprises a filter 12, wherein the filter 12 is communicated with the air inlet 101 and the oil inlet 301 of the air intake pipe 11, so that both the incoming oxygen and oil vapor can be filtered by the filter 12. Preferably, the filter 12 is embodied as an activated carbon canister.

The introducing assembly 20 includes a flow guide pipe 21 and a desorption pump 22. The introduction port 201 and the discharge port 202 are formed in the guide pipe 21. The introduction port 201 of the delivery tube 21 is communicated with the air supply port 102 and the oil supply port 302. The outlet port 202 is used to communicate with a combustion chamber of the fuel engine. Preferably, when the air intake assembly 10 includes the filter 12, the introduction port 201 of the draft tube 21 is communicated with the air supply port 102 and the oil supply port 302 through the filter 12. The desorption pump 22 is disposed on the guide pipe 21 to guide the oxygen and the oil vapor flowing from the introduction port 201 to the discharge port 202 to the combustion chamber of the fuel engine.

The oil inlet assembly 30 includes at least one oil inlet pipe 31, one end of the oil inlet pipe 31 forms the oil inlet 301, and the other end forms the oil outlet 302. The oil inlet assembly 30 further comprises a fuel tank 32, and the oil inlet 301 of the oil inlet pipe 31 is communicated with the fuel tank 32.

It should be noted that the fuel inlet assembly 30 may further include a vaporizer disposed on the fuel inlet pipe 31 to vaporize the fuel guided from the fuel tank 32 to form gaseous fuel vapor. The oil vapor and the oxygen introduced by the intake assembly 10 are fed into the combustion chamber of the fuel engine through the gas-liquid separator 40.

The gas-liquid separator 40 is provided in communication with the draft tube 21 of the introduction unit 20 and is located between the introduction port 201 and the desorption pump 22.

Specifically, the gas-liquid separator 40 forms a separation chamber 401, an inlet 402, and an outlet 403. The inlet 402 and the outlet 403 are in communication with the separation chamber 401. The draft tube 21 has a first tube portion 2101 in communication with the inlet 402 and a second tube portion 2102 in communication with the outlet 402.

Referring to fig. 2 and 3, the gas-liquid separator 40 has a bottom wall 41 and a side wall 42 formed to extend upward from the bottom wall 41. The separation chamber 401 is formed by the inner side of the side wall 42 and the inner side of the bottom wall 41. The gas-liquid separator 40 also includes a top wall 43. The top wall 43 is hermetically sealed to the separation chamber 401. It should be noted that the top wall 43 may be formed by being integrally formed with the bottom wall 41 and the side wall 42, or may be formed by a separate cover body hermetically covering the top of the side wall 42 of the gas-liquid separator 40, and the invention is not limited in this respect.

It is worth mentioning that the inner side of the side wall 42 is implemented as a cylinder. The inlet 402 is disposed in the side wall 42, and the inlet 402 is disposed toward a direction tangential to the side wall 42 in which the inlet 402 is disposed, wherein the first pipe portion 2101 communicates with the inlet 402 in the direction tangential to the side wall 42. That is, the first pipe portion 2101 is arranged to introduce fluid into the separation chamber 401 from a direction tangential to the side wall 42.

With this arrangement, after the oil vapor in the first pipe portion 2101 is introduced into the separation chamber 401 from the inlet 402, the oil vapor is guided by the inside of the side wall 42 and can flow around the inside of the side wall 42, so that the oil vapor can be prevented from directly colliding with the gas-liquid separator 40 to generate a large noise, and dirt attached to the inside of the side wall 42 can be washed away, thereby maintaining a good flow guiding ability of the side wall 42. In addition, the liquid oil mixed in the oil vapor is collected in the separation chamber 401 under the action of its own gravity, and since the oil vapor does not only circularly move along the inner side of the sidewall 42, the liquid oil collected in the separation chamber 410 can be volatilized into a gaseous state again by correspondingly high-frequency vibration. By the continuous circulation, the content of the liquid oil in the oil vapor flowing out from the outlet 403 is extremely small, so that the amount of the liquid oil entering the oil vapor can be reduced, and the gasification rate of the fuel can be increased.

Further, since the oil vapor is guided from the first pipe portion 2101 to the gas-liquid separator 40, the direction of the flow thereof is changed to detour in the separation chamber 401, so that the oil vapor is dispersed, and accordingly, the wavelength of the generated sound can be extended, and the loudness of the noise generated during the flow of the oil vapor can be reduced.

Preferably, the vertical height of the outlet 403 from the bottom wall 41 is higher than the vertical height of the inlet 402 from the bottom wall 41. When the fuel evaporation system is in a heat engine state, liquid oil falls into the bottom wall 41 under the action of its own gravity, and gaseous oil vapor diffuses to the outlet 403 to be guided out of the guide outlet 202 by the desorption pump 22. In this way, the liquid oil in the oil vapor introduced into the fuel engine can be well separated, so that the fuel combustion efficiency in the fuel engine can be improved.

In an embodiment of the present invention, a middle portion of the bottom wall 41 extends upward to form an airflow baffle 44, wherein a liquid storage region 4101 is formed between an outer wall of the airflow baffle 44 and an inner wall of the side wall 42 and the bottom wall 41. Preferably, the height of the fluid stop with respect to the bottom wall 41 is higher than the height of the inlet 402 provided to the side wall 42. Thus, after the oil vapor flows into the separation chamber 401 from the inlet 402, since the oil vapor is blocked by the airflow baffle 44 in the radial direction, more oil vapor bypasses along the inner side of the sidewall 42, thereby extending the path that the oil vapor bypasses, so that more oil droplets in the oil vapor can be deposited in the liquid trap 4101 under the action of gravity.

Preferably, at least one partition plate 45 is provided at the bottom wall 41 between the outer wall of the gas flow baffle 44 and the inner wall of the side wall 42 to avoid splashing of the liquid oil excessively deposited on the liquid storage region 4101.

More preferably, the gas flow baffle 44 is embodied as a tube. It is more worth mentioning that the top wall 43 is provided with a flow guiding tube 492, wherein one end of the flow guiding tube 492 is communicated with the outlet 403, and the other end of the flow guiding tube 492 integrally extends into the passage of the tubular gas baffle 44. In this way, the oil vapor introduced from the inlet 402 can be guided out from the outlet 403 only after the oil vapor has passed around the side wall 42 and changed in flow direction by the air pressure, and then enters the draft tube 492 from the vertical direction. During the process of changing the flow direction of the oil vapor, more oil drops fall into the liquid storage region 4101 under the action of gravity.

Preferably, in any of the above embodiments of the present invention, the outer wall of the gas-liquid separator 40 is provided with an inlet joint 47 and an outlet joint 48, respectively. One end of the inlet joint 47 is communicated with the inlet 402, and the other end of the inlet joint 47 is hermetically butted against the first pipe part 2101. One end of the outlet joint 48 is communicated with the outlet 403, and the other end of the outlet joint 48 is communicated with the second tube portion 2102.

It is worth mentioning that the direction in which the inlet connection 47 extends is implemented along the tangential direction of the side wall 42.

The inlet joint 47 and the outlet joint 48 are sealingly butted against the first pipe portion 2101 and the second pipe portion 2102, respectively.

The outer wall of the inlet joint 47 is provided with at least one annular clamping edge for clamping the first pipe part 2101.

Referring to fig. 1, 2, 4 and 5, in another embodiment of the present invention, the gas-liquid separator 40 further comprises at least one layer of partition 49, wherein the layer of partition 49 is disposed in the separation chamber 401, wherein the vertical height of the layer of partition 49 from the bottom wall 41 is lower than the height of the outlet 403 from the bottom wall 41 and is greater than the height of the inlet 402 from the bottom wall 42. Accordingly, the separation chamber 401 will be divided by the layer partition 49 into a return chamber 4011 defined between the top of the layer partition 49 and the top wall 43 and a liquid reservoir 4012 defined between the bottom of the layer partition 49 and the bottom wall 41. At the same time, the return chamber 4011 is communicated with the outlet 403. The reservoir 4012 is connected to the inlet 402.

The bottom wall of the layer partition 49 extends vertically into the reservoir 4012 to form a return pipe 491. A return orifice 4901 is formed at the end of the return conduit 491 of the reservoir 4012. At least one communicating hole 4902 is formed in the layer partition 40, wherein the return hole 4901 and the communicating hole 4902 are communicated with the return chamber 4011 and the liquid reservoir 4012, respectively. The return hole 4901 is provided on an inflow path of the oil vapor flowing in from the inlet 402.

It is worth mentioning that, since the return orifice 4901 is disposed on the inflow path of the oil vapor flowing from the inlet 402, so that a venturi effect can be formed at the return orifice 4901 to form a negative pressure of a predetermined magnitude, the oil in the return chamber 4011 is introduced into the reservoir 4012 under the action of the negative pressure, and thus, the excessive oil is prevented from being led out from the return chamber 4011 to the combustion chamber of the engine from the outlet 202. In this way, the vaporization rate of the fuel vaporization system can be increased.

With the above arrangement, when the oil vapor flows into the reservoir 4012 from the inlet 402, the oil vapor moves circumferentially along the inner side of the sidewall 42, and the hot oil vapor is lifted from the communication hole 4902 to the return chamber 4011 due to the cold-up and cold-down. Since the upward movement of the oil vapor is blocked by the layer partition 49, most of the oil vapor can flow only from the communication hole 4902 to the return chamber 4011. And a small amount of liquid oil entering the return chamber 4011 flows back to the liquid reservoir 4012 through the return hole 4901 under the action of gravity.

Further, the liquid oil mixed in the oil vapor flowing into the return chamber 4011 partially falls onto the layer partition 49 again by the action of gravity, and the liquid oil falling onto the layer partition 49 returns to the liquid reservoir 4012 through the return hole 4901. As the fuel evaporation system continuously circulates, the liquid oil in the liquid storage chamber 4012 is vibrated at high frequency and gradually volatilizes into oil vapor, so as to be guided out from the outlet 403 to the combustion chamber of the engine from the outlet 202 again in the form of oil vapor.

It can be understood that, since the oil vapor is guided into the gas-liquid separator 40 and moves circumferentially along the inner side of the sidewall 43, and then moves up and down after being lifted to the return chamber 4011, the direction of the oil vapor movement is changed, thereby increasing the efficiency of oil vapor and liquid-oil separation.

More preferably, the top of the layer partition 49 extends into the reflow chamber 4011 to form a boss 492, wherein the middle of the boss 492 forms a lift channel 49201 communicating with the reservoir chamber 4012 in the vertical direction, and wherein the sidewall of the boss 492 forms a through hole communicating with the lift channel 49201 to define the communication hole 4902. With this arrangement, the oil vapor entering the return chamber 4011 from the lifting channel 49201 needs to change the flow direction again to be able to flow out from the outlet 403, so as to extend the path through which the oil vapor circulates in the gas-liquid separator 40, so that the liquid oil in the oil vapor can be sufficiently separated.

Since the liquid oil flowing back in the liquid storage chamber 4012 can vibrate along with the oil vapor generating high frequency vibration, the liquid oil in the liquid storage chamber 4012 can be quickly volatilized into the oil vapor, so that oil droplets can be quickly recycled.

Referring to fig. 1, 2 and 6-8, in another embodiment of the present invention, the fuel vaporization system includes a circulation assembly 50. The circulation assembly 50 includes a venturi 51 and a return pipe 52. The venturi 51 is communicated with the first pipe portion 2101 of the draft tube 21. The return pipe 52 is communicated with the separation chamber 401 and the venturi 51.

Therefore, when the oil vapor is guided from the draft tube 21 to the separator, the oil vapor passes through the venturi 51 and then enters the separator 401 through the first tube part 2101 of the draft tube 21.

Accordingly, the liquid oil deposited in the separation chamber 401 is conducted back to the venturi 51 by the return pipe 52 due to the pressure difference. By such a long reciprocating cycle, the liquid oil mixed in the oil vapor can be separated by the gas-liquid separator 40 and re-evaporated into the oil vapor during the subsequent cycle.

As can be understood by those skilled in the art from the above description, the gas-liquid separator 40 not only can achieve a good noise reduction effect, but also can separate the mixed liquid oil from the oil vapor and cyclically vaporize the mixed liquid oil into the oil vapor, thereby improving the utilization efficiency of the fuel.

It will be appreciated by persons skilled in the art that the embodiments of the invention shown in the foregoing description are by way of example only and are not limiting of the invention. The objects of the invention have been fully and effectively accomplished. The functional and structural principles of the present invention have been shown and described in the examples, and any variations or modifications of the embodiments of the present invention may be made without departing from the principles.

Claims

1. A fuel vaporization system, wherein said fuel vaporization system comprises:

2. A fuel evaporation system as set forth in claim 1, wherein a vertical height of said outlet from said bottom wall is higher than a vertical height of said inlet from said bottom wall.

3. A fuel evaporation system as claimed in claim 1 or claim 2, wherein the central portion of the bottom wall extends upwardly to form an air flow baffle, and wherein a liquid reservoir is formed between the outer wall of the air flow baffle and the inner wall of the side wall and the bottom wall.

4. A fuel evaporation system as set forth in claim 3, wherein a height of a top end of said air flow stop with respect to said bottom wall is higher than a height of said inlet port provided in said side wall.

5. A fuel evaporation system as claimed in claim 4, wherein at least one partition is provided at the bottom wall between the outer wall of the air flow baffle and the inner wall of the side wall.

6. A fuel evaporation system as set forth in claim 5, wherein said flow baffle is implemented in a tubular shape, and said top wall is provided with a flow guide tube, wherein one end of said flow guide tube communicates with said outlet, and wherein the other end of said flow guide tube integrally extends into a passage of said tubular flow baffle and communicates with said separation chamber.

7. A fuel evaporation system as claimed in claim 1, wherein an inlet joint and an outlet joint are provided respectively on an outer wall of the gas-liquid separator, one end of the inlet joint is communicated with the inlet, the other end of the inlet joint is sealingly butted against the first pipe portion, and one end of the outlet joint forms the outlet and is communicated with the second pipe portion.

8. A fuel evaporation system as set forth in claim 7, wherein said direction in which said inlet joint extends is implemented in a tangential direction of said side wall.

9. A method of circulating oil vapor of a fuel evaporation system, comprising the steps of:

10. A method of circulating fuel vapor of a fuel evaporation system as set forth in claim 9, wherein a vertical height of said outlet from said bottom wall is higher than a vertical height of said inlet from said bottom wall.