Combined fuel tank structure and automobile fuel system

Abstract

The utility model provides a combined oil tank structure and an automobile fuel system, and relates to the technical field of fuel automobiles. The oil filling port is formed in the top of the main oil tank, so that the top of the auxiliary oil tank set communicates with the top of the main oil tank through the first communicating pipe, and the bottom of the auxiliary oil tank set communicates with the bottom of the main oil tank through the second communicating pipe; meanwhile, an exhaust pipe is only arranged at the top of a target auxiliary oil tank with the longest fuel oil transmission path with the main oil tank in the auxiliary oil tank set, so that the main oil tank and the auxiliary oil tank share the same exhaust pipe to exhaust air outwards, air pressure balance between the main oil tank and the auxiliary oil tank is achieved through a first communication pipe, and hydraulic balance between the main oil tank and the auxiliary oil tank is achieved through assistance of a second communication pipe; fuel entering the main fuel tank can be conveyed to the target auxiliary fuel tank through the second communicating pipe and the first communicating pipe under the action of air pressure and hydraulic pressure, it is guaranteed that all the fuel tanks can be filled with corresponding fuel tank structures through one-time refueling operation, repeated refueling operation does not need to be executed, and the fuel tank refueling efficiency and the product reliability are improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of fuel automobile, in particular to a combined fuel tank structure and automobile fuel system. BACKGROUND

[0002] The fuel tank is a common oil storage device in the use process of fuel automobile. Long-distance truck, underground personnel transport vehicle and other fuel vehicles often have the problem of inconvenient refueling due to the need to perform transportation operation in special environment. Usually, split fuel tanks are used to ensure that the corresponding fuel vehicles have sufficient oil storage capacity to avoid the negative impact of frequent refueling on transportation operation.

[0003] At present, the split fuel tank commonly used in the industry usually connects the bottoms of the main fuel tank and the standby fuel tank to ensure that the liquid levels of the two fuel tanks are as consistent as possible. At the same time, exhaust pipes are arranged at the tops of the two fuel tanks to realize the cooperative oil storage function of the main fuel tank and the standby fuel tank by adding fuel to the main fuel tank and transferring fuel from the main fuel tank to the standby fuel tank. However, it is worth noting that in the actual refueling process, the main fuel tank may be filled (even fuel may overflow from the exhaust pipe of the main fuel tank) but the standby fuel tank may not be filled. Therefore, it is necessary to stop refueling when the main fuel tank is filled and to wait for a period of time before refueling again. Usually, multiple refueling operations need to be repeated to ensure that all fuel tanks are filled. In other words, the split fuel tank has the problems of low refueling efficiency and poor product reliability. CONTENT OF THE UTILITY MODEL

[0004] Therefore, the purpose of the present application is to provide a combined fuel tank structure and automobile fuel system, which can realize the air pressure balance between the main fuel tank and the standby fuel tank through the first communication pipe and assist the second communication pipe to realize the hydraulic balance between the main fuel tank and the standby fuel tank. At the same time, by arranging an exhaust pipe only on the standby fuel tank with the longest fuel transmission path between the main fuel tank, the main fuel tank and the standby fuel tank share the same exhaust pipe for external exhaust, so as to ensure that the corresponding fuel tank structure can be filled by one-time refueling operation in the actual refueling process, thereby effectively improving the refueling efficiency and product reliability of the fuel tank.

[0005] In order to achieve the above purpose, the technical solutions adopted by the embodiments of the present application are as follows:

[0006] In a first aspect, the present application provides a combined fuel tank structure, which comprises a main fuel tank and a standby fuel tank group.

[0007] The top of the main oil tank is provided with a filling port, the top of the auxiliary oil tank group is communicated with the top of the main oil tank through a first communication pipe, the bottom of the auxiliary oil tank group is communicated with the bottom of the main oil tank through a second communication pipe, wherein only the top of a target auxiliary oil tank among all auxiliary oil tanks in the auxiliary oil tank group is provided with an exhaust pipe communicated with the outside, and the target auxiliary oil tank is an auxiliary oil tank with the longest fuel transmission path between the main oil tank.

[0008] In an optional embodiment, the total number of auxiliary oil tanks in the auxiliary oil tank group is one.

[0009] In an optional embodiment, the total number of auxiliary oil tanks in the auxiliary oil tank group is multiple, the top of each of all first auxiliary oil tanks in the auxiliary oil tank group except the target auxiliary oil tank is communicated with the top of the main oil tank through a first communication pipe, the bottom of each of all first auxiliary oil tanks is communicated with the bottom of the main oil tank through a second communication pipe, wherein the first auxiliary oil tank is any one of the auxiliary oil tanks in the auxiliary oil tank group except the target auxiliary oil tank;

[0010] The top of each of all first auxiliary oil tanks is communicated with the top of the target auxiliary oil tank through a first communication pipe, and the bottom of each of all first auxiliary oil tanks is communicated with the bottom of the target auxiliary oil tank through a second communication pipe.

[0011] In an optional embodiment, the total number of auxiliary oil tanks in the auxiliary oil tank group is multiple, all auxiliary oil tanks in the auxiliary oil tank group are connected in series with the main oil tank, wherein the top of any two oil tanks connected in series and adjacent is communicated through a first communication pipe, and the bottom of any two oil tanks connected in series and adjacent is communicated through a second communication pipe, and the target auxiliary oil tank is an auxiliary oil tank farthest from the main oil tank in the series connection path of the oil tanks.

[0012] In an optional embodiment, the total number of auxiliary oil tanks in the auxiliary oil tank group is multiple, the auxiliary oil tank group includes multiple second auxiliary oil tanks and at least one third auxiliary oil tank except the target auxiliary oil tank;

[0013] The top of each of all second auxiliary oil tanks is communicated with the top of the main oil tank through a first communication pipe, and the bottom of each of all second auxiliary oil tanks is communicated with the bottom of the main oil tank through a second communication pipe;

[0014] At least one second auxiliary oil tank is connected in series with the target auxiliary oil tank through at least one third auxiliary oil tank, and the remaining second auxiliary oil tanks without the third auxiliary oil tank are directly connected in series with the target auxiliary oil tank, wherein the top of any two auxiliary oil tanks connected in series and adjacent is communicated through a first communication pipe, and the bottom of any two auxiliary oil tanks connected in series and adjacent is communicated through a second communication pipe.

[0015] In an optional embodiment, an oil level sensor is installed on the target sub-tank, which is used to monitor the total fuel amount in the combined tank structure and display the monitored total fuel amount.

[0016] In an optional embodiment, a liquid level switch is installed on the target sub-tank, which is used to detect whether the fuel level in the target sub-tank reaches an upper limit value and drive the refueling device to stop refueling when the fuel level reaches the upper limit value.

[0017] In an optional embodiment, a first joint is installed on the top of each of the main tank and all sub-tanks, and each first joint is individually fixedly connected with one end of a first communication pipe through a sleeve, wherein the installation position of each first joint on the corresponding tank is above the highest fuel level of the tank.

[0018] In an optional embodiment, a second joint is installed on the bottom of each of the main tank and all sub-tanks, and each second joint is individually fixedly connected with one end of a second communication pipe through a sleeve, wherein the installation position of each second joint on the corresponding tank is close to the bottom end face of the tank, and any two tanks that need to be communicated are communicated through multiple second communication pipes.

[0019] In a second aspect, the application provides an automobile fuel system, which comprises the combined tank structure according to any one of the preceding embodiments.

[0020] In this case, the beneficial effects of the embodiments of the application can include the following:

[0021] The application sets a refueling port on the top of the main tank, makes the top of the sub-tank group and the top of the main tank communicated through the first communication pipe, makes the bottom of the sub-tank group and the bottom of the main tank communicated through the second communication pipe, sets an exhaust pipe that communicates with the outside on the top of the target sub-tank with the longest fuel transmission path between the main tank and the sub-tank among all sub-tanks included in the sub-tank group, and makes the main tank and the sub-tank share the same exhaust pipe for external exhaust, so as to realize the air pressure balance between the main tank and the sub-tank through the first communication pipe and assist the hydraulic balance between the main tank and the sub-tank through the second communication pipe, make the fuel entering the main tank transmitted to the target sub-tank through the second communication pipe and the first communication pipe under the action of air pressure and hydraulic pressure, and ensure that all tanks included in the corresponding tank structure can be kept in the fuel storage full state when the target sub-tank is full of fuel and stops refueling, without the need to perform multiple refueling operations, thereby effectively improving the oil tank refueling efficiency and product reliability.

[0022] In order to make the above-mentioned purposes, features and advantages of the application more obvious and easy to understand, the following preferred embodiments are described in detail below, and the accompanying drawings are described as follows. BRIEF DESCRIPTION OF DRAWINGS

[0023] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings needed to be used in the embodiments will be briefly introduced as follows. It should be understood that the following drawings only show some embodiments of the present application, and therefore should not be regarded as a limitation on the scope. For those skilled in the art, other related drawings can also be obtained without creative labor on the basis of these drawings.

[0024] Figure 1 Structure composition schematic diagram of the combined oil tank structure provided by the embodiments of the present application;

[0025] Figure 2 Structure composition schematic diagram of the combined oil tank structure provided by the embodiments of the present application; Figure 1 Schematic diagram of the oil filling state of the combined oil tank structure shown in the figure when the main oil tank is not full;

[0026] Figure 3 Schematic diagram of the oil filling state of the combined oil tank structure shown in the figure when the target auxiliary oil tank is not full; Figure 1 Schematic diagram of the oil filling state of the combined oil tank structure shown in the figure when the target auxiliary oil tank is not full;

[0027] Figure 4 Structure composition schematic diagram of the combined oil tank structure provided by the embodiments of the present application;

[0028] Figures: 10-combined oil tank structure; 11-main oil tank; 12-auxiliary oil tank group; 121-auxiliary oil tank; 111-oil filling port; 122-exhaust pipe; 13-first communication pipe; 14-second communication pipe; 123-first joint; 124-second joint; 15-oil quantity sensor; 16-liquid level switch. DETAILED DESCRIPTION

[0029] In order to make the purpose, technical solutions and advantages of the embodiments of the present application more clear, the technical solutions in the embodiments of the present application will be described clearly and completely in the following with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are some embodiments of the present application, but not all the embodiments. The components of the embodiments of the present application described and shown in the drawings herein can be arranged and designed in various different configurations.

[0030] Therefore, the following detailed description of the embodiments of the present application provided in the drawings is not intended to limit the scope of the claimed present application, but only represents selected embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor are within the scope of protection of the present application.

[0031] It should be noted that similar reference numerals and letters refer to like items in the accompanying drawings, and once an item is defined in one drawing, it need not be further defined and explained in subsequent drawings.

[0032] In the description of the present application, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, or the orientation or positional relationship commonly understood by those skilled in the art, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the present application. In addition, the terms "first", "second", "third", and the like are only used to distinguish the description and cannot be understood as indicating or implying relative importance.

[0033] In the description of the present application, it should be noted that unless otherwise explicitly specified and limited, the terms "set", "mount", "connected", "connected" should be broadly understood, for example, it can be fixedly connected, or it can be detachably connected, or integrally connected; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium; it can be the communication inside two elements. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0034] Some embodiments of the present application will be described in detail below with reference to the accompanying drawings. The following examples and features in the examples can be combined with each other without conflict.

[0035] Please refer to Figure 1 , Figure 1 is one of the structural composition schematic diagrams of the combined fuel tank structure 10 provided by the embodiments of the present application. In the embodiments of the present application, the combined fuel tank structure 10 can be filled with all fuel tanks by one-time refueling operation, without performing multiple refueling operations, and can effectively prevent fuel from overflowing from the main fuel tank, thereby effectively improving the fuel tank refueling efficiency and product reliability.

[0036] In the embodiments of the present application, the combined fuel tank structure 10 can include a main fuel tank 11 and a sub-fuel tank group 12, wherein the sub-fuel tank group 12 includes at least one sub-fuel tank 121 Figure 1The single auxiliary tank 121 shown is merely a schematic representation of the composition of the auxiliary tank group 12 and does not limit the specific composition of the auxiliary tank group 12. In this embodiment, a refueling port 111 is provided at the top of the main tank 11. The top of the auxiliary tank group 12 is connected to the top of the main tank 11 via a first connecting pipe 13, and the bottom of the auxiliary tank group 12 is connected to the bottom of the main tank 11 via a second connecting pipe 14. Of all the auxiliary tanks 121 included in the auxiliary tank group 12, only the top of the target auxiliary tank is provided with an exhaust pipe 122 that communicates with the outside world. The target auxiliary tank is the auxiliary tank 121 with the longest fuel transmission path between it and the main tank 11. The refueling port 111 can be an electric refueling port to facilitate connection to an electric refueling device for refueling the combined tank structure 10.

[0037] In the embodiment of the present application, when the total number of the auxiliary fuel tanks of the auxiliary fuel tank group 12 is 1 (e.g. Figure 1 As shown), the target auxiliary tank is the single auxiliary tank 121 included in the auxiliary tank group 12. At this time, the target auxiliary tank is directly connected to the main tank 11 through the first connecting pipe 13 and the second connecting pipe 14.

[0038] In an embodiment of the present application, when the total number of the auxiliary tanks in the auxiliary tank group 12 is multiple, all the auxiliary tanks 121 included in the auxiliary tank group 12 can be connected to each other through the first connecting pipe 13 installed on the top and the second connecting pipe 14 installed on the bottom. There is at least one auxiliary tank 121 in the auxiliary tank group 12 that is directly connected to the main tank 11 through the first connecting pipe 13 and the second connecting pipe 14. The other auxiliary tanks 121 in the auxiliary tank group 12 except the target auxiliary tank need to be directly or indirectly connected to the target auxiliary tank by using the first connecting pipe 13 and the second connecting pipe 14, so that the target auxiliary tank actually belongs to the common terminal tank of all fuel transmission paths involved in the combined tank structure 10, and the main tank 11 belongs to the common starting tank of all fuel transmission paths involved in the combined tank structure 10.

[0039] Optionally, in the first embodiment of the present embodiment, when the total number of the sub-oil tanks in the sub-oil tank group 12 is multiple, all the first sub-oil tanks in the sub-oil tank group 12, except the target sub-oil tank, can be connected in parallel (not shown in the figure) with the main oil tank 11 and the target sub-oil tank, wherein the first sub-oil tank is any one of the sub-oil tanks 121 in the sub-oil tank group 12, except the target sub-oil tank. Specifically, the top of each of all the first sub-oil tanks is connected with the top of the main oil tank 11 through the first connecting pipe 13, the bottom of each of all the first sub-oil tanks is connected with the bottom of the main oil tank 11 through the second connecting pipe 14, the top of each of all the first sub-oil tanks is connected with the top of the target sub-oil tank through the first connecting pipe 13, and the bottom of each of all the first sub-oil tanks is connected with the bottom of the target sub-oil tank through the second connecting pipe 14.

[0040] Optionally, in the second embodiment of the present embodiment, when the total number of the sub-oil tanks in the sub-oil tank group 12 is multiple, all the sub-oil tanks 121 in the sub-oil tank group 12, including the target sub-oil tank, can be connected in series (not shown in the figure) with the main oil tank 11. Specifically, all the sub-oil tanks 121 included in the sub-oil tank group 12 are connected in series, and the target sub-oil tank is the last sub-oil tank in all the sub-oil tanks 121, at this time, the first sub-oil tank in all the sub-oil tanks 121 is directly connected with the main oil tank 11, and the target sub-oil tank is the sub-oil tank 121 farthest from the main oil tank 11 in the corresponding oil tank series connection path. Wherein, the top of any two oil tanks (including the main oil tank 11) connected in series and adjacent to each other is connected through the first connecting pipe 13, and the bottom of any two oil tanks (including the main oil tank 11) connected in series and adjacent to each other is connected through the second connecting pipe 14.

[0041] Optionally, in the third embodiment of the present application, when the number of the sub-tank groups 12 is more than one, the sub-tanks 121 other than the target sub-tank in the sub-tank group 12 can be connected in series and parallel combination (not shown in the drawings) to the main tank 11 and the target sub-tank. Specifically, the sub-tank group 12 includes a plurality of second sub-tanks and at least one third sub-tank in addition to the target sub-tank, the top of each of the second sub-tanks is connected to the top of the main tank 11 through the first connecting pipe 13, the bottom of each of the second sub-tanks is connected to the bottom of the main tank 11 through the second connecting pipe 14, at least one second sub-tank is connected in series with the target sub-tank through at least one third sub-tank, and the remaining second sub-tanks without the third sub-tank are directly connected in series with the target sub-tank, wherein the top of any two sub-tanks 121 connected in series and adjacent (including the target sub-tank) is connected through the first connecting pipe 13, and the bottom of any two sub-tanks 121 connected in series and adjacent (including the target sub-tank) is connected through the second connecting pipe 14.

[0042] In the present application, the combined tank structure 10 can use the first connecting pipe 13 to balance the air pressure between the main tank and the sub-tanks, use the second connecting pipe 14 to balance the liquid pressure between the main tank and the sub-tanks, and ensure that the main tank and the sub-tanks share the same exhaust pipe 122 for external exhaust. When the combined tank structure 10 starts to be filled with fuel, the fuel will flow into the main tank 11 through the fuel inlet 111, at which time the fuel level in the main tank 11 rises, and then the fuel in the main tank 11 will be transferred to the target sub-tank through the second connecting pipe 14 under the action of air pressure and liquid pressure, and through each sub-tank 121 included in the sub-tank group 12, while the air in the main tank 11 will be transferred to the exhaust pipe 122 on the target sub-tank through the first connecting pipe 13 under the action of air pressure and liquid pressure, and then be discharged into the atmosphere through the exhaust pipe 122.

[0043] When the main tank 11 is full of fuel, the air in the main tank 11 has been substantially exhausted, and if there is still air in a sub-tank 121 connected to the main tank 11 that has not been exhausted, at this time the fuel in the main tank 11 will be transferred to the sub-tank 121 through the first connecting pipe 13 connected to the main tank 11 under the action of liquid pressure, in order to accelerate the fuel level rising rate of the sub-tank 121. In this process, the combined tank structure 10 substantially uses the first connecting pipe 13 to assist the second connecting pipe 14 to balance the liquid pressure between the main tank and the sub-tanks.

[0044] For any one of the fuel-injected sub-tank 121 (e.g. the target sub-tank, or other sub-tank 121 directly or indirectly communicated with the target sub-tank), the air in the sub-tank 121 will also be discharged into the atmosphere through the first communication pipe 13 via the exhaust pipe 122, and will also be transmitted to other sub-tank 121 using the connected first communication pipe 13 when it is full of oil, so that when the target sub-tank is full of oil and stops refueling, it can effectively ensure that the combined tank structure 10 is full of all tanks (including the main tank 11 and all sub-tanks 121) under one-time refueling operation, without the need to perform multiple refueling operations, thereby effectively improving the tank refueling efficiency and product reliability.

[0045] The following illustrates the tank refueling process of the combined tank structure 10 shown in Figure 1 Figure 2 When starting to refuel the combined tank structure 10 shown in Figure 1 , the fuel will flow into the main tank 11 shown in Figure 1 through the fuel inlet 111 shown in Figure 1 , at this time the fuel level in the main tank 11 rises, and the fuel entering the main tank 11 will be transmitted to the target sub-tank 121 included in the sub-tank group 12 via the second communication pipe 14 under the action of air pressure and hydraulic pressure (corresponding to the red arrow indicating "fuel flow direction" in Figure 2 ), the target sub-tank 121 will start to store oil; at the same time, the air in the main tank 11 will be transmitted to the exhaust pipe 122 on the target sub-tank 121 via the first communication pipe 13 under the action of air pressure and hydraulic pressure (corresponding to the blue arrow indicating "air flow direction" in Figure 2 ), and discharged into the atmosphere through the exhaust pipe 122.

[0046] Please refer to Figure 3 When the main tank 11 is full of oil, the air in the main tank 11 has been basically discharged, but there is still air in the target sub-tank 121 that has not been discharged (i.e. the target sub-tank 121 has not yet full of oil), at this time the fuel in the main tank 11 will be transmitted to the target sub-tank 121 via the first communication pipe 13 connected to the main tank 11 under the action of hydraulic pressure, to speed up the fuel level rising rate of the sub-tank 121, until the target sub-tank 121 is full of oil and stops refueling, so that all tanks in the combined tank structure shown in Figure 1 are kept in a full fuel storage state, and effectively prevent fuel from overflowing from the main tank 11, to improve the tank refueling efficiency and product reliability. Among them, the main tank 11 is full of oil and stops refueling, and the target sub-tank 121 is full of oil and stops refueling, so that all tanks in the combined tank structure shown in Figure 1 ​During the one-time refueling process of the combined fuel tank structure 10 shown, the air in the target sub-tank 121 will continue to be discharged into the atmosphere through the exhaust pipe 122 under the action of air pressure and hydraulic pressure.

[0047] Optionally, please refer to Figure 4 , Figure 4 is a second structural composition schematic diagram of the combined fuel tank structure 10 provided by the embodiment of the present application. In the embodiment of the present application, the combined fuel tank structure 10 can further include an oil quantity sensor 15 installed on the target sub-tank, which is used to monitor the total fuel quantity in the combined fuel tank structure 10 and display the monitored total fuel quantity, so that the fuel tank refueling personnel can intuitively know whether the combined fuel tank structure 10 currently needs to continue to be refueled, thereby avoiding the fuel overflow phenomenon of the combined fuel tank structure 10 and at the same time trying to ensure that each tank in the combined fuel tank structure 10 can be filled with fuel at one time.

[0048] Optionally, in the embodiment of the present application, the combined fuel tank structure 10 can further include a liquid level switch 16 installed on the target sub-tank, which is used to detect whether the fuel level in the target sub-tank reaches the upper limit value of the liquid level, and drive the refueling equipment to stop refueling when the fuel level reaches the upper limit value of the liquid level, so as to avoid fuel overflow through the exhaust pipe 122 on the target sub-tank, at the same time realize the automatic stop function of refueling, and ensure that each tank in the combined fuel tank structure 10 can be filled with fuel at one time under the one-time refueling operation.

[0049] It can be understood that in the embodiment of the present application, the combined fuel tank structure 10 can be provided with a first joint 123 on the top of each of the main tank 11 and all sub-tanks 121, so that each first joint 123 is individually connected with one end of a first communication pipe 13 through a sleeve, so as to effectively improve the fuel transmission sealing performance and the air transmission sealing performance. The installation position of each first joint 123 on the corresponding tank is above the highest fuel level of the tank.

[0050] In addition, in the embodiment of the present application, the combined fuel tank structure 10 can further be provided with a second joint 124 on the bottom of each of the main tank 11 and all sub-tanks 121, so that each second joint 124 is individually connected with one end of a second communication pipe 14 through a sleeve, so as to effectively improve the fuel transmission sealing performance. The installation position of each second joint 124 on the corresponding tank is close to the bottom end face of the tank; any two tanks that need to be communicated in the combined fuel tank structure 10 can be communicated through a plurality of second communication pipes 14 (for example, Figure 1 or Figure 4The two second communication pipes 14 are communicated to improve the fuel transmission efficiency between the corresponding two oil tanks and improve the fuel transmission reliability between the corresponding two oil tanks, and reduce the influence of negative factors such as fuel impurities and communication pipe blockage on the fuel transmission effect.

[0051] In the present application, the embodiments of the present application also provide an automobile fuel system, which comprises any one of the combined oil tank structures 10 and provides a large enough oil storage capacity by using the combined oil tank structure 10, so as to ensure that the automobile fuel system can run for as long as possible, and reduce the negative influence of refueling operation on automobile transportation operation.

[0052] The above is only various embodiments of the present application, but the protection scope of the present application is not limited thereto, and any person skilled in the art can easily think of changes or replacements within the technical range disclosed in the present application, which should be covered within the protection scope of the present application. Therefore, the protection scope of the present application should be subject to the protection scope of the claims.

Claims

1. A combined fuel tank structure, characterized in that: The combined fuel tank structure includes a main fuel tank and an auxiliary fuel tank group; A refueling port is provided on the top of the main fuel tank, the top of the auxiliary fuel tank group is connected to the top of the main fuel tank through a first connecting pipe, and the bottom of the auxiliary fuel tank group is connected to the bottom of the main fuel tank through a second connecting pipe, wherein, among all the auxiliary fuel tanks included in the auxiliary fuel tank group, only the top of the target auxiliary fuel tank is provided with an exhaust pipe connected to the outside world, and the target auxiliary fuel tank is the auxiliary fuel tank with the longest fuel transmission path between it and the main fuel tank.

2. The combined fuel tank structure according to claim 1, characterized in that: The total number of auxiliary fuel tanks in the auxiliary fuel tank group is 1.

3. The combined oil tank structure according to claim 1, characterized in that: The auxiliary fuel tank group includes a plurality of auxiliary fuel tanks, the tops of all first auxiliary fuel tanks in the auxiliary fuel tank group except the target auxiliary fuel tank are connected to the top of the main fuel tank via a first connecting pipe, and the bottoms of all first auxiliary fuel tanks are connected to the bottom of the main fuel tank via a second connecting pipe, wherein the first auxiliary fuel tank is any auxiliary fuel tank in the auxiliary fuel tank group except the target auxiliary fuel tank; The tops of all the first auxiliary tanks are connected to the top of the target auxiliary tank via a first connecting pipe, and the bottoms of all the first auxiliary tanks are connected to the bottom of the target auxiliary tank via a second connecting pipe.

4. The combined oil tank structure according to claim 1, characterized in that: The auxiliary tank group has a total number of auxiliary tanks, and all auxiliary tanks included in the auxiliary tank group are connected in series with the main tank, wherein the tops of any two adjacent tanks connected in series are connected through a first connecting pipe, and the bottoms of any two adjacent tanks connected in series are connected through a second connecting pipe, and the target auxiliary tank is the auxiliary tank farthest from the main tank on the tank series path.

5. The combined oil tank structure according to claim 1, characterized in that: The total number of the auxiliary fuel tanks in the auxiliary fuel tank group is multiple, and the auxiliary fuel tank group includes multiple second auxiliary fuel tanks and at least one third auxiliary fuel tank in addition to the target auxiliary fuel tank; The tops of all the second auxiliary fuel tanks are connected to the top of the main fuel tank via a first connecting pipe, and the bottoms of all the second auxiliary fuel tanks are connected to the bottom of the main fuel tank via a second connecting pipe; At least one second auxiliary fuel tank is connected in series with the target auxiliary fuel tank via at least one third auxiliary fuel tank, and the remaining second auxiliary fuel tanks without the third auxiliary fuel tank connected in series are directly connected in series with the target auxiliary fuel tank respectively, wherein the tops of any two adjacent auxiliary fuel tanks connected in series are connected through a first connecting pipe, and the bottoms of any two adjacent auxiliary fuel tanks connected in series are connected through a second connecting pipe.

6. The combined fuel tank structure according to any one of claims 1 to 5, characterized in that: The target auxiliary fuel tank is equipped with a fuel quantity sensor, which is used to monitor the total fuel quantity in the combined fuel tank structure and display the monitored total fuel quantity.

7. The combined oil tank structure according to claim 6, characterized in that: The target auxiliary tank is equipped with a liquid level switch, wherein the liquid level switch is used to detect whether the fuel level in the target auxiliary tank has reached an upper limit value, and when the fuel level reaches the upper limit value, drive the refueling equipment to stop refueling.

8. The combined fuel tank structure according to any one of claims 1 to 5, characterized in that: Each of the main fuel tank and all the auxiliary fuel tanks is equipped with a first joint on the top, and each first joint is fixedly connected to one end of a first connecting pipe through a sleeve, wherein the installation position of each first joint on the corresponding fuel tank is above the highest fuel liquid level of the tank.

9. The combined oil tank structure according to any one of claims 1 to 5, characterized in that: Each of the main fuel tank and all the auxiliary fuel tanks is equipped with a second joint at the bottom, and each second joint is individually fixedly connected to one end of a second connecting pipe through a sleeve, wherein the installation position of each second joint on the corresponding fuel tank is close to the bottom end surface of the fuel tank, and any two fuel tanks that need to be connected are connected through multiple second connecting pipes.

10. An automobile fuel system, characterized in that: The automobile fuel system includes the combined fuel tank structure according to any one of claims 1 to 9.

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