Oil and gas recovery system and vehicle having the same

Abstract

The present invention discloses an oil and gas recovery system and a vehicle having the same. The oil and gas recovery system includes: a fuel tank; a gas storage tank; a cooling device for exchanging heat with the gas storage tank; a connecting pipeline including an intake pipeline and a return oil pipeline. The intake pipeline is connected between the fuel tank and the gas storage tank, and the fuel vapor in the fuel tank can enter the gas storage tank through the intake pipeline. The return oil pipeline is connected between the gas storage tank and the fuel tank. The fuel vapor in the gas storage tank can be liquefied after being cooled by the cooling device and then flow back to the fuel tank through the return oil pipeline. Thus, by exchanging heat with the gas storage tank through the cooling device, the fuel vapor can be liquefied, which is convenient for the fuel to flow back from the gas storage tank to the fuel tank, thereby realizing the recovery of the fuel vapor. Moreover, the recovery efficiency of the fuel vapor is high. At the same time, there is no need to arrange a carbon canister in the oil and gas recovery system, which saves the layout space required by the oil and gas recovery system and improves the space utilization rate.

Description

Technical Field

[0001] The present invention relates to the technical field of vehicles, and in particular, to an oil and gas recovery system and a vehicle having the same. Background Art

[0002] Currently, in the oil and gas recovery system applied to vehicles, an oil and gas tank is usually arranged between the fuel tank and the engine. The function of the oil and gas tank is to pressurize and condense part of the fuel vapor and send it back to the fuel tank, and the remaining fuel vapor is sent to the carbon canister, so as to reduce the load of the carbon canister. The function of the carbon canister is to introduce the fuel vapor into the engine for combustion, prevent the fuel vapor from volatilizing into the atmosphere, and at the same time avoid the problem of fuel vapor leakage during the refueling process of the fuel tank. However, in this fuel vapor recovery method, the pressure that the oil and gas tank for storing fuel vapor can reach is limited, which is determined by the volume of the oil and gas tank and the amount of compressed gas inside it. At normal temperature, high pressures (such as 10 MPa, 20 MPa, etc.) are required for fuel vapor, resulting in low oil and gas recovery efficiency of the existing oil and gas recovery system, and most of the oil and gas in the oil and gas recovery system still need to be recovered through the carbon canister. Summary of the Invention

[0003] The present invention aims to solve at least one of the technical problems existing in the prior art. To this end, an object of the present invention is to provide an oil and gas recovery system in which a carbon canister is not required, thereby improving the utilization rate of the layout space of the oil and gas recovery system.

[0004] Another object of the present invention is to provide a vehicle.

[0005] The oil and gas recovery system according to the first aspect embodiment of the present invention includes: a fuel tank for storing fuel; a gas storage tank connected to the fuel tank; a cooling device for exchanging heat with the gas storage tank; a connecting pipeline including an intake pipeline and a return oil pipeline. The intake pipeline is connected between the fuel tank and the gas storage tank, and the fuel vapor in the fuel tank can enter the gas storage tank through the intake pipeline; the return oil pipeline is connected between the gas storage tank and the fuel tank, and the fuel vapor in the gas storage tank can be liquefied after being cooled by the cooling device and then flow back to the fuel tank through the return oil pipeline.

[0006] According to the oil and gas recovery system of the embodiment of the present invention, the gas storage tank can be used to store fuel vapor, and by exchanging heat with the gas storage tank through the cooling device, the fuel vapor can be liquefied, so that the fuel can flow back to the fuel tank from the gas storage tank through the return oil pipeline, thereby realizing the recovery of fuel vapor, with high fuel vapor recovery efficiency. At the same time, a carbon canister does not need to be arranged in the oil and gas recovery system, saving the layout space required by the oil and gas recovery system and improving the space utilization rate.

[0007] According to some embodiments of the present invention, the gas storage tank includes: a first tank body, the first tank body is formed with a gas storage cavity, and the gas storage cavity is respectively communicated with the intake pipe and the oil return pipe; a second tank body, the second tank body sleeves the first tank body, and the inner wall surface of the second tank body is spaced from the outer wall surface of the first tank body to define a heat exchange cavity between the first tank body and the second tank body, and the cooling device is communicated with the heat exchange cavity.

[0008] According to some embodiments of the present invention, the gas storage tank further includes a partition plate, the partition plate is connected between the first tank body and the second tank body and is arranged between the liquid inlet pipe and the liquid outlet pipe to separate the liquid inlet of the liquid inlet pipe from the liquid outlet of the liquid outlet pipe.

[0009] According to some embodiments of the present invention, the cooling device includes: a liquid inlet pipe, the liquid inlet pipe is communicated with the heat exchange cavity, and the heat exchange medium can flow into the heat exchange cavity through the liquid inlet pipe; a liquid outlet pipe, the liquid outlet pipe is communicated with the heat exchange cavity, and the heat exchange medium can flow out of the heat exchange cavity through the liquid outlet pipe.

[0010] According to some embodiments of the present invention, the oil and gas recovery system further includes a controller, and the controller can be used to control the operation of the vacuum pump.

[0011] According to some embodiments of the present invention, the connecting pipe further includes an exhaust pipe, the exhaust pipe is connected between the gas storage tank and the engine, and the fuel vapor in the gas storage tank can enter the engine through the exhaust pipe.

[0012] According to some embodiments of the present invention, the exhaust pipe is provided with a first control valve, and the first control valve is used to control the on-off state of the exhaust pipe.

[0013] According to some embodiments of the present invention, the oil and gas recovery system further includes a second control valve, and the second control valve is arranged on the oil return pipe and is used to control the on-off state of the oil return pipe.

[0014] According to some embodiments of the present invention, the oil and gas recovery system further includes a vacuum pump, the vacuum pump is arranged on the intake pipe and is used to pump the fuel vapor in the fuel tank to the gas storage tank.

[0015] According to some embodiments of the present invention, the oil and gas recovery system further includes a third control valve, and the third control valve is arranged on the intake pipe and is used to control the on-off state of the intake pipe.

[0016] According to some embodiments of the present invention, the oil and gas recovery system further includes a pressure sensor, the pressure sensor is used to detect the pressure in the fuel tank, and the pressure sensor is adapted to communicate with the controller.

[0017] A vehicle according to an embodiment of the second aspect of the present invention includes the above-mentioned oil and gas recovery system.

[0018] Additional aspects and advantages of the present invention will be given in part in the following description, become apparent in part from the following description, or be learned through the practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] The above and / or additional aspects and advantages of the present invention will become apparent and be readily understood from the description of the embodiments in conjunction with the following drawings, in which:

[0020] Figure 1 is a schematic diagram of the oil and gas recovery system according to an embodiment of the present invention;

[0021] Figure 2 is a schematic connection diagram of the gas storage tank according to an embodiment of the present invention;

[0022] Figure 3 is a cross-sectional view of the gas storage tank according to an embodiment of the present invention.

[0023] Reference Signs:

[0024] Oil and gas recovery system 100,

[0025] Fuel tank 10, fuel filling pipe 11,

[0026] Gas storage tank 20, gas storage chamber 20a, heat exchange chamber 20b, first tank body 21, second tank body 22, partition 23,

[0027] Cooling device 30, liquid inlet pipe 31, liquid outlet pipe 32,

[0028] Intake air pipeline 41, oil return pipeline 42, exhaust pipeline 43,

[0029] Vacuum pump 50, controller 60, first control valve 71, second control valve 72, third control valve 73,

[0030] Pressure sensor 80, engine 90. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0031] Embodiments of the present invention will be described in detail below. Examples of the embodiments are shown in the drawings, where the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the drawings are exemplary only for explaining the present invention and should not be construed as limiting the present invention.

[0032] Reference will be made below to Figures 1 - 3 describe the oil and gas recovery system 100 according to an embodiment of the present invention.

[0033] The oil and gas recovery system 100 according to an embodiment of the present invention includes: a fuel tank 10, a gas storage tank 20, a cooling device 30, a connecting pipeline, and a vacuum pump 50. The fuel tank 10 is used for storing fuel. The fuel tank 10 is provided with a fuel filling pipe 11, and fuel can be filled into the fuel tank 10 through the fuel filling pipe 11. The gas storage tank 20 is connected to the fuel tank 10. The fuel usually includes diesel, gasoline, etc. Among them, gasoline has the characteristic of being volatile. Therefore, when fuel is injected into the fuel tank 10, the pressure inside the fuel tank 10 will increase. The oil and gas recovery system 100 can liquefy and recover the fuel vapor, while preventing the pressure inside the fuel tank 10 from being too high and improving the fuel vapor recovery efficiency of the oil and gas recovery system 100.

[0034] As Figure 1 shown, the cooling device 30 is used for heat exchange of the gas storage tank 20, so as to cool the gas storage tank 20, liquefy the fuel vapor in the gas storage tank 20, and improve the recovery efficiency of the fuel vapor.

[0035] Among them, a connecting pipeline is provided in the oil and gas recovery system 100. The connecting pipeline includes an intake pipeline 41 and a return oil pipeline 42. The intake pipeline 41 is connected between the fuel tank 10 and the gas storage tank 20. The fuel vapor in the fuel tank 10 can enter the gas storage tank 20 through the intake pipeline 41; the return oil pipeline 42 is also connected between the gas storage tank 20 and the fuel tank 10. After the fuel vapor in the gas storage tank 20 is liquefied by the cooling device 30, it can flow back to the fuel tank 10 through the return oil pipeline 42 to realize the recovery of the fuel vapor.

[0036] Furthermore, the vacuum pump 50 is provided on the intake pipeline 41, and the vacuum pump 50 is used to pump the fuel vapor in the fuel tank 10 to the gas storage tank 20 to adjust the pressure inside the fuel tank 10 and prevent the fuel tank 10 from being deformed due to excessive or too small pressure. The vacuum pump 50 is provided with a check valve to prevent the fuel vapor from flowing back to the fuel tank 10 through the intake pipeline 41 due to the pressure in the gas storage tank 20 being greater than the pressure in the fuel tank 10, and ensure the operation stability and reliability of the oil and gas recovery system 100.

[0037] When refueling the fuel tank 10, the vacuum pump 50 can pump the fuel vapor in the fuel tank 10 into the gas storage tank 20 to ensure that the pressure in the fuel tank 10 is within the balance range and avoid excessive or too small pressure in the fuel tank 10. It can be understood that when the pressure in the fuel tank 10 is too high, it will affect the smoothness of the refueling operation; when the pressure in the fuel tank 10 is too small, the fuel tank 10 is prone to deformation under the action of atmospheric pressure. Among them, if the efficiency of the vacuum pump 50 in extracting fuel vapor is too high, the pressure in the fuel tank 10 will be too small, posing a risk of deforming the fuel tank 10. At this time, the power of the vacuum pump 50 can be controlled to decrease to avoid too small pressure in the fuel tank 10. Thus, by using the vacuum pump 50 to pump the fuel vapor in the fuel tank 10 into the gas storage tank 20, the pressure in the fuel tank 10 can be adjusted to ensure that the pressure in the fuel tank 10 is within the pressure range suitable for refueling.

[0038] It should be noted that since gasoline is a volatile liquid, the fuel tank is usually filled with fuel vapor at room temperature. Currently, in the vapor recovery system applied to vehicles, a carbon canister and a gas-oil tank are usually arranged between the fuel tank and the engine. The function of the gas-oil tank is to pressurize and condense part of the fuel vapor and send it back to the fuel tank, and the remaining fuel vapor is sent to the carbon canister, thereby reducing the load on the carbon canister. The function of the carbon canister is to introduce the fuel vapor into the engine for combustion, prevent the fuel vapor from volatilizing into the atmosphere, and at the same time avoid the problem of fuel vapor leakage during the refueling process of the fuel tank. However, in this fuel vapor recovery method, the pressure that the gas-oil tank for storing fuel vapor can reach is limited, which is determined by the volume of the gas-oil tank and the amount of compressed gas inside. At room temperature, the fuel vapor requires a high pressure (such as 10 MPa, 20 MPa, etc.), resulting in low fuel vapor recovery efficiency of the existing vapor recovery system, and most of the oil and gas in the vapor recovery system still need to be recovered through the carbon canister.

[0039] In the vapor recovery system 100 of the present application, the carbon canister is cancelled, and the vapor recovery system 100 can be constructed as a closed recovery system. The cooling device 30 exchanges heat with the gas storage tank 20 to cool and convert the fuel vapor in the gas storage tank 20 into a liquid state. The liquid fuel can flow back into the fuel tank 10 through the oil return pipeline 42, and at the same time, it will not have a great impact on the pressure in the fuel tank 10.

[0040] Among them, the pressure value in the gas storage tank 20 is related to the amount of compressed gas inside the gas storage tank 20. Pumping fuel vapor into the gas storage tank 20 through the vacuum pump 50 can increase the pressure in the gas storage tank 20. Further, by using the cooling device 30 to exchange heat with the gas storage tank 20, the fuel vapor can be cooled while increasing the pressure, which is convenient for the liquefaction of the fuel vapor in the gas storage tank 20 and improves the recovery efficiency of the fuel vapor.

[0041] According to the oil and gas recovery system 100 of an embodiment of the present invention, the gas storage tank 20 can be used to store fuel vapor, and the fuel vapor can be liquefied by heat exchange of the gas storage tank 20 through the cooling device 30, so that the fuel can flow back into the fuel tank 10 through the oil return pipeline 42 from the gas storage tank 20, thereby realizing the recovery of the fuel vapor, and the fuel vapor recovery efficiency is high. At the same time, there is no need to arrange a carbon canister in the oil and gas recovery system 100, which saves the layout space required by the oil and gas recovery system 100 and improves the space utilization rate.

[0042] As Figure 2 shown, in some embodiments of the present invention, the gas storage tank 20 includes a first tank body 21 and a second tank body 22. The first tank body 21 forms a gas storage cavity 20a, and the gas storage cavity 20a is respectively communicated with the intake pipeline 41 and the oil return pipeline 42. The gas storage cavity 20a is used to accommodate the fuel vapor pumped by the vacuum pump 50 to the gas storage tank 20. The fuel vapor can be converted into a liquid state in the first tank body 21 and flow back into the fuel tank 10 through the oil return pipeline 42. The second tank body 22 is sleeved outside the first tank body 21, and the inner wall surface of the second tank body 22 is spaced from the outer wall surface of the first tank body 21 to define a heat exchange cavity 20b between the first tank body 21 and the second tank body 22. The cooling device 30 is communicated with the heat exchange cavity 20b to exchange heat with the gas storage tank 20 through the heat exchange cavity 20b.

[0043] Referring to Figure 2 , the intake pipeline 41 and the oil return pipeline 42 pass through the second tank body 22 and are communicated with the gas storage cavity 20a of the first tank body 21. The fuel vapor in the fuel tank 10 can enter the gas storage tank 20 through the intake pipeline 41, and the liquefied fuel in the outlet pipe can flow back into the fuel tank 10 through the oil return pipeline 42.

[0044] It can be understood that the cooling device 30 is provided with a heat exchange medium, and the heat exchange medium is used to exchange heat with the gas storage tank 20, so as to exchange heat with the gas storage tank 20 and cool down the gas storage tank 20. Since the heat exchange cavity 20b is defined between the first tank body 21 and the second tank body 22, when the heat exchange medium enters the heat exchange cavity 20b, the heat exchange medium can be in full contact with the first tank body 21 and the second tank body 22 to exchange heat with the first tank body 21 and the second tank body 22. Among them, the main heat exchange target of the cooling device 30 is the first tank body 21. The first tank body 21 stores gaseous fuel vapor, and the gaseous fuel vapor fills the first tank body 21, so as to ensure the heat exchange effect between the heat exchange medium and the fuel vapor, convert the gaseous fuel vapor into liquid fuel, and improve the fuel vapor recovery efficiency.

[0045] As Figure 2As shown, in some embodiments of the present invention, the connection end of the oil return pipeline 42 to the first tank 21 is located at the bottom of the first tank 21, facilitating the liquid fuel to flow back into the fuel tank 10 through the oil return pipeline 42. It can be understood that the fuel vapor in the gas storage tank 20 condenses and liquefies and will be centrally collected at the bottom of the first tank 21. Setting the connection position of the oil return pipeline 42 to the first tank 21 at the bottom of the first tank 21 can ensure that the fuel flows back to the fuel tank 10 through the oil return pipeline 42.

[0046] Furthermore, when the first tank 21 is configured as a spherical structure, the inner wall surface of the first tank 21 is arc-shaped, and the liquid fuel attached to the inner wall surface of the first tank 21 can flow along the extending direction of the wall surface and gather in the bottom area of the first tank 21, that is, the position corresponding to the oil return pipeline 42.

[0047] In some embodiments of the present invention, the cooling device 30 includes a liquid inlet pipe 31 and a liquid outlet pipe 32. The liquid inlet pipe 31 is communicated with the heat exchange chamber 20b, and the heat exchange medium can flow into the heat exchange chamber 20b through the liquid inlet pipe 31; the liquid outlet pipe 32 is communicated with the heat exchange chamber 20b, and the heat exchange medium can flow out of the heat exchange chamber 20b through the liquid outlet pipe 32. Thus, the gas storage tank 20 can be heat-exchanged through the cooperation of the liquid inlet pipe 31, the liquid outlet pipe 32, and the heat exchange chamber 20b.

[0048] It should be noted that the oil and gas recovery system 100 in the present application is applied to a vehicle. The cooling device 30 can be a part of the vehicle cooling system, that is, the liquid inlet pipe 31 and the liquid outlet pipe 32 can be led out from the vehicle cooling system to realize the circulation of the heat exchange medium. Of course, the cooling device 30 can also be a separately provided device independent of the vehicle cooling system, and the heat exchange medium inside it can circulate independently.

[0049] Combined Figure 2 and Figure 3 , in a further embodiment of the present invention, the gas storage tank 20 further includes a partition 23. The partition 23 is connected between the first tank 21 and the second tank 22, and the partition 23 is arranged between the liquid inlet pipe 31 and the liquid outlet pipe 32 to separate the liquid inlet of the liquid inlet pipe 31 from the liquid outlet of the liquid outlet pipe 32, preventing the heat exchange medium entering the heat exchange chamber 20b through the liquid inlet from flowing out directly from the liquid outlet, and ensuring that the heat exchange medium can fully contact the first tank 21.

[0050] Specifically, the partition plate 23 is supported between the first tank body 21 and the second tank body 22, connecting the first tank body 21 and the second tank body 22. At the same time, the partition plate 23 can partition the heat exchange cavity 20b, thereby forming a heat exchange flow path in the heat exchange cavity 20b. The heat exchange medium can flow in the heat exchange flow path, making the flow of the heat exchange medium regular in the heat exchange cavity 20b, and ensuring that the heat exchange medium can be in full contact with the first tank body 21, improving the heat exchange effect of the cooling device 30 on the first tank body 21, and further improving the recovery efficiency of the oil and gas recovery system 100 for fuel vapor.

[0051] Combined with Figure 2 and Figure 3 In some embodiments of the present invention, both the first tank body 21 and the second tank body 22 are configured as spherical structures. The radius of the second tank body 22 is greater than that of the first tank body 21. The second tank body 22 is sleeved outside the first tank body 21, and the first tank body 21 and the second tank body 22 are connected and supported by the partition plate 23. At this time, the first tank body 21 is completely accommodated in the second tank body 22, and the heat exchange cavity 20b can cover the first tank body 21, so that the heat exchange medium in the heat exchange cavity 20b can be in full contact with the first tank body 21.

[0052] In a further embodiment of the present invention, referring to Figure 2 and Figure 3 The partition plate 23 is one. The partition plate 23 is connected and supported between the first tank body 21 and the second tank body 22, and the partition plate 23 partitions the heat exchange cavity 20b. The liquid inlet pipe 31 and the liquid outlet pipe 32 are respectively communicated with the heat exchange cavity 20b on both sides of the partition plate 23, so as to ensure that the heat exchange medium can be in full contact with the first tank body 21 and improve the cooling efficiency.

[0053] Specifically, combined with Figure 2 and Figure 3 The partition plate 23 is arranged at the middle position of the heat exchange cavity 20b. The liquid inlet pipe 31 and the liquid outlet pipe 32 are arranged on the side of the gas storage tank 20 close to the partition plate 23. The communication position of the liquid inlet pipe 31 with the heat exchange cavity 20b is above the partition plate 23, and the communication position of the liquid outlet pipe 32 with the heat exchange cavity 20b is below the partition plate 23. The arrangement of the partition plate 23 can prevent the heat exchange medium entering the heat exchange cavity 20b from the liquid inlet pipe 31 from flowing out directly from the liquid outlet pipe 32, so that the heat exchange medium can be in full contact with the first tank body 21 and ensure the cooling efficiency of the cooling device 30 for the gas storage tank 20.

[0054] In some embodiments of the present invention, there are multiple partition plates 23. The multiple partition plates 23 can partition the heat exchange cavity 20b into heat exchange flow paths. The liquid inlet pipe 31 is communicated with the liquid inlet of the heat exchange flow path, and the liquid outlet pipe 32 is communicated with the liquid outlet of the heat exchange flow path. The heat exchange medium can enter the heat exchange cavity 20b through the liquid inlet and flow out from the liquid outlet after flowing through the heat exchange flow path to realize circulation.

[0055] It should be noted that the partition plate 23 can divide the heat exchange chamber 20b in an interleaved arrangement to divide the heat exchange chamber 20b into one or more heat exchange channels. When there are multiple heat exchange channels, the multiple heat exchange channels communicate with each other. The present application does not specifically limit the arrangement manner of the partition plate 23, that is, the partition plate 23 can separate the communication position between the liquid inlet pipe 31 and the heat exchange chamber 20b and the communication position between the liquid outlet pipe 32 and the heat exchange chamber 20b. The installation position and arrangement manner of the partition plate 23 can be designed according to the heat exchange requirements of the gas storage tank 20 to ensure the heat exchange efficiency of the cooling device 30 for the gas storage tank 20.

[0056] In some embodiments of the present invention, the oil and gas recovery system 100 further includes a controller 60, and the controller 60 can be used to control the operation of the vacuum pump 50. Among them, when the controller 60 detects that the pressure inside the fuel tank 10 is too high, it can control the operation of the vacuum pump 50 to pump the fuel vapor in the fuel tank 10 into the gas storage tank 20 to adjust the pressure inside the fuel tank 10 and avoid excessive pressure inside the fuel tank 10. The controller 60 can also control the power of the vacuum pump 50 according to the pressure inside the fuel tank 10 to control the pressure inside the fuel tank 10 within a reasonable threshold range.

[0057] In some embodiments of the present invention, the connecting pipeline further includes an exhaust pipeline 43, and the exhaust pipeline 43 is connected between the gas storage tank 20 and the engine 90. The fuel vapor in the gas storage tank 20 can actively enter the engine 90 through the exhaust pipeline 43.

[0058] It can be understood that the gas storage tank 20 is used to store fuel vapor, and the pressure inside the gas storage tank 20 is high. When the gas storage tank 20 is connected to the engine through the exhaust pipeline 43, the fuel vapor in the gas storage tank 20 can be actively sent to the engine 90 to participate in combustion, thereby avoiding the problem that the negative pressure environment at the engine end is insufficient due to the miniaturization, supercharging, and hybridization of the engine displacement, and further causing the fuel vapor to be unable to enter the engine 90.

[0059] It should be noted that at present, a carbon canister is provided between the gas tank and the engine, and the fuel vapor in the gas tank needs to be extracted by the engine negative pressure. Due to the miniaturization, supercharging, and hybridization of the engine displacement, the negative pressure environment at the engine end is insufficient, that is, the absolute value of the negative pressure generated at the engine end is small, and the negative pressure duration is short, which cannot effectively ensure that the fuel vapor in the gas tank enters the engine to participate in combustion.

[0060] Such as Figure 1As shown, one end of the exhaust gas pipeline 43 is communicated with the gas storage cavity 20a, and the other end of the exhaust gas pipeline 43 is communicated with the intake manifold of the engine 90, or the other end of the exhaust gas pipeline 43 is arranged at the front end of the intake manifold to ensure that the fuel vapor discharged through the exhaust gas pipeline 43 can enter the engine 90 to participate in combustion, that is, the exhaust gas pipeline 43 can communicate the gas storage tank 20 with the intake system of the engine 90.

[0061] As Figure 1 As shown, in a further embodiment of the present invention, the exhaust gas pipeline 43 is provided with a first control valve 71. The first control valve 71 is used to control the on-off state of the exhaust gas pipeline 43, and the first control valve 71 can communicate with the controller 60, so that the communication state between the gas storage cavity 20a and the engine 90 can be controlled through the controller 60. When it is necessary to transport the fuel vapor in the gas storage tank 20 to the engine 90, the first control valve 71 is opened to communicate the gas storage tank 20 with the intake system of the engine 90; when it is not necessary to transport the fuel vapor in the gas storage tank 20 to the engine 90, the first control valve 71 is closed, and at this time, the gas storage tank 20 cannot discharge the fuel vapor through the exhaust gas pipeline 43.

[0062] In some embodiments of the present invention, the oil and gas recovery device further includes a pressure detection device. The pressure detection device is used to detect the pressure in the gas storage tank 20, and the pressure detection device can communicate with the controller 60. The controller 60 can control the on-off device of the first control valve 71 according to the pressure in the gas storage tank 20.

[0063] Specifically, when it is detected that the pressure in the gas storage tank 20 is greater than the atmospheric pressure, the first control valve 71 can be opened. At this time, the fuel vapor in the gas storage tank 20 can flow to the engine 90 through the exhaust gas pipeline 43; when it is detected that the pressure in the gas storage tank 20 is less than the atmospheric pressure, the controller 60 controls the first control valve 71 to close. At this time, the air-fuel ratio of the engine 90 is only affected by the fuel injection amount and the intake air amount of the intake system. It can be understood that when the negative pressure in the gas storage tank 20 is the same as the negative pressure at the engine 90 end, the engine 90 cannot extract the fuel vapor from the gas storage tank 20.

[0064] In some embodiments of the present invention, the oil and gas recovery system 100 further includes a second control valve 72. The second control valve 72 is disposed in the oil return pipeline 42, and the second control valve 72 is used to control the on-off state of the oil return pipeline 42. Moreover, the second control valve 72 can communicate with the controller 60, so that the communication state between the gas storage cavity 20a and the fuel tank 10 can be controlled through the controller 60. When there is condensed and liquefied fuel in the gas storage tank 20, the controller 60 controls the second control valve 72 to open, and the fuel in the gas storage tank 20 can flow into the fuel tank 10 through the oil return pipeline 42; when there is no fuel in the air outlet pipe, the controller 60 controls the second control valve 72 to close to disconnect the gas storage tank 20 from the fuel tank 10, so as to prevent the fuel vapor in the fuel tank 10 from flowing into the gas storage tank 20 through the oil return pipeline 42.

[0065] It can be understood that the controller 60 can judge whether there is fuel in the gas storage tank 20 according to the pressure change in the gas storage tank 20 (i.e., the liquid fuel formed by the condensation and liquefaction of fuel vapor), referring to Figure 1 , for example: the first control valve 71 in the oil and gas recovery system 100 is closed, the pressure value detected by the pressure detection device is the first pressure value, the gas storage tank 20 is heat-exchanged through the cooling device 30, and when the pressure value detected by the pressure detection device is the second pressure value and the second pressure value is less than the first pressure value, it indicates that the fuel vapor in the gas storage tank 20 is condensed into fuel after heat exchange. At this time, the controller 60 can control the second control valve 72 to open so that the fuel in the gas storage tank 20 only flows back into the fuel tank 10 through the oil return pipeline 42. The above is only one way to judge the conversion of fuel vapor in the gas storage tank 20 into liquid fuel. The oil and gas recovery system 100 can also judge whether there is liquid fuel in the gas storage tank 20 by other means, and is not limited thereto.

[0066] In some embodiments of the present invention, the oil and gas recovery system 100 further includes a third control valve 73. The third control valve 73 is disposed in the air inlet pipeline 41, and the third control valve 73 is arranged in the upstream section of the vacuum pump 50, for example: arranged at the connection position of the air inlet pipeline 41 and the fuel tank 10. The third control valve 73 is used to control the on-off state of the air inlet pipeline 41. When it is necessary to pump the fuel vapor in the fuel tank 10 to the gas storage tank 20 through the vacuum pump 50, the third control valve 73 is opened, and the vacuum pump 50 can pump the fuel vapor in the fuel tank 10 to the gas storage tank 20 to reduce the pressure in the fuel tank 10.

[0067] In some embodiments of the present invention, the oil and gas recovery system 100 further includes a pressure sensor 80. The pressure sensor 80 is used to detect the pressure in the fuel tank 10, and the pressure sensor 80 can communicate with the controller 60. The controller 60 can obtain the real-time pressure value in the fuel tank 10 through the pressure sensor 80 and control the operating state of the oil and gas recovery system 100 according to the pressure in the fuel tank 10.

[0068] Specifically, when refueling the fuel tank 10, the pressure inside the fuel tank 10 will gradually increase as fuel is injected. At this time, the controller 60 can control the operation of the vacuum pump 50 to pump the fuel vapor inside the fuel tank 10 to the gas storage tank 20. Among them, the pressure sensor 80 can detect the pressure inside the fuel tank 10 in real time, and the controller 60 can adjust the operating power of the vacuum pump 50 according to the pressure signal provided by the pressure sensor 80 to control the pressure in the fuel tank 10 within a preset range. When the pressure inside the fuel tank 10 is lower than the minimum value of the preset range, the controller 60 controls the power of the vacuum pump 50 to decrease to avoid permanent deformation of the fuel tank 10 due to too low pressure; when the pressure inside the fuel tank 10 is higher than the maximum value of the preset range, the controller 60 controls the power of the vacuum pump 50 to increase to ensure a smooth refueling process.

[0069] In some embodiments of the present invention, the connecting pipeline further includes an exhaust pipeline 43, and the exhaust pipeline 43 is connected between the gas storage tank 20 and the engine 90;

[0070] The oil and gas recovery system 100 further includes: a first control valve 71, a second control valve 72, a third control valve 73 and a controller 60. The first control valve 71 is provided on the exhaust pipeline 43, the second control valve 72 is provided on the oil return pipeline 42, the third control valve 73 is provided on the intake pipeline 41, and the controller 60 communicates with the first control valve 71, the second control valve 72 and the third control valve 73 to control the opening and closing states of the first control valve 71, the second control valve 72 and the third control valve 73.

[0071] Among them, the controller 60 can control the first control valve 71 to open, the second control valve 72 and the third control valve 73 to close, so that the gas storage tank 20 is connected to the engine 90, and the fuel vapor in the gas storage tank 20 can enter the engine 90 through the exhaust pipeline 43; the controller 60 can control the second control valve 72 to open, the first control valve 71 and the third control valve 73 to close, so that the gas storage tank 20 is connected to the fuel tank 10, and the fuel in the gas storage tank 20 can flow back to the fuel tank 10 through the oil return pipeline 42; the controller 60 can control the third control valve 73 to open, the first control valve 71 and the second control valve 72 to close, so that the gas storage tank 20 is connected to the fuel tank 10, and the fuel vapor in the fuel tank 10 can enter the gas storage tank 20 through the intake pipeline 41. It should be noted that the control method of the controller 60 is not limited to this, and the first control valve 71, the second control valve 72 and the third control valve 73 can be independently controlled according to the control requirements of the oil and gas recovery system 100.

[0072] In some embodiments of the present invention, the controller 60 is further in communication with the vacuum pump 50 to control the vacuum pump 50 to extract fuel vapor while controlling the opening of the third control valve 73, and the controller 60 can control the operating power of the vacuum pump 50 based on the pressure parameter of the fuel tank 10 obtained by the pressure sensor 80 to ensure the operating reliability and stability of the vapor recovery system 100.

[0073] The vehicle according to an embodiment of the present invention includes the above-mentioned vapor recovery system 100. The cooling device 30 in the vapor recovery system 100 can exchange heat with the gas storage tank 20 to condense and liquefy the fuel vapor in the gas storage tank 20, improving the fuel recovery efficiency of the fuel vapor. Moreover, there is no need to provide a carbon canister in the vapor recovery system 100, which can improve the utilization rate of the layout space of the vapor recovery system 100 and ensure the emission level of the vapor recovery system 100. At the same time, the vapor recovery system 100 can also selectively supply fuel vapor to the engine 90. Since the pressure in the gas storage tank 20 can be greater than the pressure on the intake system side of the engine 90, there is no need to provide a negative pressure source and desorption amount on the engine 90 side. And when the vapor recovery system 100 does not supply fuel vapor to the engine 90, it is beneficial to the control of the air-fuel ratio of the engine 90.

[0074] In the description of the present invention, it should be understood that the orientation or positional relationship indicated by the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation to the present invention.

[0075] In the description of the present invention, the meaning of "a plurality of" is two or more.

[0076] In the description of the present invention, the first feature being "above" or "below" the second feature may include the direct contact between the first and second features, or may include the situation where the first and second features are not in direct contact but in contact through other features therebetween.

[0077] In the description of the present invention, the first feature being "above", "above" and "on the top" of the second feature includes that the first feature is directly above and obliquely above the second feature, or simply means that the horizontal height of the first feature is higher than that of the second feature.

[0078] In the description of this specification, the descriptions with reference to the terms "one embodiment", "some embodiments", "illustrative embodiments", "examples", "specific examples", or "some examples", etc. mean that the specific features, structures, materials, or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic descriptions of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described can be combined in a suitable manner in any one or more embodiments or examples.

[0079] Although the embodiments of the present invention have been shown and described, those of ordinary skill in the art can understand that various changes, modifications, substitutions, and variations can be made to these embodiments without departing from the principles and spirit of the present invention. The scope of the present invention is defined by the claims and their equivalents.

Claims

1. An oil and gas recovery system, characterized in that, Comprising: A fuel tank for storing fuel; An air storage tank connected to the fuel tank; A cooling device for exchanging heat with the air storage tank; A connecting pipeline including an intake pipeline and a return oil pipeline. The intake pipeline is connected between the fuel tank and the air storage tank, and the fuel vapor in the fuel tank can enter the air storage tank through the intake pipeline; The return oil pipeline is connected between the air storage tank and the fuel tank. The fuel vapor in the air storage tank can be liquefied after being cooled by the cooling device and flow back to the fuel tank through the return oil pipeline; The connecting pipeline further includes an exhaust pipeline connected between the air storage tank and the engine, and the fuel vapor in the air storage tank can enter the engine positively and actively through the exhaust pipeline; It further includes a second control valve provided in the return oil pipeline for controlling the on-off state of the return oil pipeline; It further includes a vacuum pump provided in the intake pipeline and used to pump the fuel vapor in the fuel tank to the air storage tank; The connection end of the return oil pipeline and the first tank body is located at the bottom of the first tank body.

2. The oil and gas recovery system according to claim 1, wherein The air storage tank includes: A first tank body forming an air storage cavity, and the air storage cavity is respectively communicated with the intake pipeline and the return oil pipeline; A second tank body sleeving the first tank body, and the inner wall surface of the second tank body is spaced from the outer wall surface of the first tank body to define a heat exchange cavity between the first tank body and the second tank body. The cooling device is communicated with the heat exchange cavity.

3. The oil and gas recovery system according to claim 2, characterized in that, The cooling device includes: An inlet pipe communicated with the heat exchange cavity, and the heat exchange medium can flow into the heat exchange cavity through the inlet pipe; An outlet pipe communicated with the heat exchange cavity, and the heat exchange medium can flow out of the heat exchange cavity through the outlet pipe.

4. The oil and gas recovery system according to claim 3, wherein The air storage tank further includes a partition connected between the first tank body and the second tank body and arranged between the inlet pipe and the outlet pipe to separate the inlet of the inlet pipe from the outlet of the outlet pipe.

5. The oil and gas recovery system according to claim 1, wherein The exhaust pipeline is provided with a first control valve for controlling the on-off state of the exhaust pipeline.

6. The oil and gas recovery system according to claim 1, wherein It further includes a third control valve provided in the intake pipeline for controlling the on-off state of the intake pipeline.

7. The oil and gas recovery system according to claim 1, characterized in that, It further includes a pressure sensor for detecting the pressure in the fuel tank, and the pressure sensor communicates with the controller.

8. The oil and gas recovery system according to claim 1, wherein The connecting pipeline further includes an exhaust pipeline connected between the air storage tank and the engine; The oil and gas recovery system further includes: a first control valve, a second control valve, a third control valve and a controller. The first control valve is provided in the exhaust pipeline, the second control valve is provided in the return oil pipeline, the third control valve is provided in the intake pipeline, and the controller is communicatively connected to the first control valve, the second control valve and the third control valve to control the opening and closing states of the first control valve, the second control valve and the third control valve; wherein, The controller can control the opening of the first control valve, the closing of the second control valve and the third control valve, the gas storage tank is communicated with the engine, and the fuel vapor in the gas storage tank can enter the engine through the exhaust pipe; The controller can control the opening of the second control valve, the closing of the first control valve and the third control valve, the gas storage tank is communicated with the fuel tank, and the fuel in the gas storage tank can flow back to the fuel tank through the oil return pipe; The controller can control the opening of the third control valve, the closing of the first control valve and the second control valve, the gas storage tank is communicated with the fuel tank, and the fuel vapor in the fuel tank can enter the gas storage tank through the intake pipe.

9. A vehicle, characterized in that, Comprising the oil and gas recovery system according to any one of claims 1-8.

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