CN211223032U

CN211223032U - Diesel vehicle oil tank with built-in fuel filter

Info

Publication number: CN211223032U
Application number: CN201922250333.0U
Authority: CN
Inventors: 郭步春
Original assignee: Individual
Current assignee: Individual
Priority date: 2019-12-16
Filing date: 2019-12-16
Publication date: 2020-08-11
Anticipated expiration: 2029-12-16

Abstract

The utility model provides a diesel vehicle oil tank with a built-in fuel filter, which comprises an oil supply system, a fuel preheating system and a fuel filter, wherein the oil supply system comprises an oil tank, the oil tank is provided with an oil supply pipe and an oil return pipe, and the oil tank is provided with a cavity for accommodating the fuel filter; the fuel filter is connected to the oil supply pipe of the oil tank and is arranged in the cavity of the oil tank; the fuel preheating system is arranged in the fuel tank, and the heat generated by the fuel preheating system is used for heating the oil in the fuel tank and the fuel filter. The utility model discloses the sump oil tank, fire oil filter, fuel preheat as an organic wholely, have saved the installation space who fires oil filter, and the oil tank all adopts removable filter element formula structure in one side of vehicle with the filter, and also easy to operate when maintaining the renew cartridge, maintenance renew cartridge only need the renew cartridge, makes things convenient for the filter core to change the dismouting, has practiced thrift and has fired oil filter shell cost, has saved the power consumption of oil-water separator individual heating in the vehicle traveles.

Description

Diesel vehicle oil tank with built-in fuel filter

Technical Field

The utility model belongs to the technical field of the vehicle technique and specifically relates to a built-in diesel vehicle oil tank that has fuel filter.

Background

The diesel type automobile is widely used in life and relates to various industries. The fuel tank is a vehicle fuel storage container and is an essential part of the vehicle.

The conventional oil tank and the fuel filter are of a structure which is arranged separately, the fuel filter usually comprises an oil-water separator and a filter, the oil-water separator and the filter of products on the market are required to be assembled on an engine and an automobile body independently, the occupied space is large, the products are exposed and are easy to be damaged by external collision, and the overall replacement cost is high when the products are replaced.

In addition, under the low temperature environment, the vehicle is difficult to start due to the condensation of fuel when using high-grade fuel, especially when the temperature drops to 0 ℃ in autumn and winter or the diesel model is not changed in time, the diesel fuel is thickened or even condensed into a wax body due to the fact that the vehicle stays and flameout for a long time, oil passages, fuel filters and the like are blocked, the vehicle cannot start or even causes losses such as faults, and the like, so that great potential safety hazards exist, and the fuel system is required to be additionally provided with an additional heating device under the low temperature condition to meet the requirements of the low temperature environment. Among the prior art, oil tank and oil water separator need heat respectively, have caused heat utilization not enough on the one hand, and on the other hand because fuel filter exposes in the external world, and fluid is great with external difference in temperature among the vehicle driving process, needs extra consumption unnecessary heat, and under extremely cold condition, fuel filter also has the phoenix canula that condenses, and the vehicle cold start is difficult moreover.

Disclosure of Invention

The technical task of the utility model is not enough to prior art, a built-in diesel vehicle oil tank that has fuel filter is provided.

The utility model provides a technical scheme that its technical problem adopted is:

a diesel vehicle oil tank with a built-in fuel filter comprises an oil supply system, a fuel preheating system and a fuel filter,

the fuel supply system comprises a fuel tank, wherein a fuel supply pipe and a fuel return pipe are arranged on the fuel tank, the fuel supply pipe and the fuel return pipe are used for being connected with the fuel tank of the engine to form a loop, and a cavity for accommodating the fuel filter is formed in the fuel tank;

the fuel filter is connected to an oil supply pipe of the oil tank and is arranged in a cavity of the oil tank;

the fuel preheating system is arranged in the fuel tank and comprises a heat exchange element, and the heat generated by the heat exchange element is used for heating the oil in the fuel tank and the fuel filter.

In an embodiment of the present invention, the heat exchange element is a water circulation heater, the water circulation heater is disposed in the oil tank, the water circulation heater is provided with a tube pass channel and a shell pass channel, the tube pass channel is provided with a water inlet and a water return port, the shell pass channel is provided with an oil pumping port and an oil outlet, the water inlet and the water return port are used for connecting with the engine water tank to form a loop, the oil pumping port is connected with the oil tank, and the oil outlet is connected with the oil supply pipe.

In another embodiment of the present invention, the fuel preheating system adopts an electric heating method, and the oil and the fuel filter in the fuel tank are heated by the built-in electric heater.

The scheme is preferably that the oil supply system has two oil tanks, which are respectively a main oil tank and an auxiliary oil tank, wherein the main oil tank is provided with a main oil supply pipe connected with the auxiliary oil supply pipe on the auxiliary oil tank through an oil inlet switching valve, the main oil tank is also provided with a main oil return pipe connected with the auxiliary oil return pipe on the auxiliary oil tank through an oil return switching valve, the main oil tank is provided with a cavity for accommodating a fuel filter, and the fuel filter is arranged in the cavity of the main oil tank.

Preferably, the auxiliary oil tank is installed in a mode that the auxiliary oil tank is separately processed and is hung outside the main oil tank or a partition plate is inserted into the original main oil tank to separate the auxiliary oil tank.

Preferably, two inner supporting plates are arranged in the main oil tank, and holes are formed in the inner supporting plates to communicate the main oil tank.

The scheme is preferred, oil feed diverter valve, fuel diverter valve are two three-way valves.

Preferably, the fuel filter comprises an oil-water separator and/or a filter.

Preferably, the fuel preheating system is arranged on one side, close to the fuel filter, in the fuel tank.

Preferably, a heater is arranged in the fuel filter to realize auxiliary heating.

Preferably, a fuel level sensor is arranged in the fuel tank.

Preferably, the oil tank is further provided with an oil filling port, an oil discharging port and an exhaust port.

Preferably, the oil supply pipe of the oil tank is provided with an electric oil pump, and the installation position of the electric oil pump is preferably arranged between the outlet of the oil-water separator and the inlet of the filter, so that auxiliary oil pumping is realized.

Preferably, the main fuel tank is internally provided with a high-grade fuel tank, and the auxiliary fuel tank is internally provided with a low-grade fuel tank. In the season of higher temperature, the auxiliary fuel tank can also be used as the auxiliary fuel tank of the high-grade fuel tank.

The utility model discloses an it has fuel filter's diesel vehicle oil tank to embed, compare produced beneficial effect with prior art and be:

1. the utility model discloses structure integration oil tank, fire oil filter, fuel preheat as an organic wholely, have saved the installation space who fires oil filter, the oil tank is in one side of vehicle, and oil water separator all adopts removable filter element formula structure with the filter, and also easy to operate during the maintenance renew cartridge, maintenance renew cartridge only need the renew cartridge, makes things convenient for the filter core to change the dismouting, has practiced thrift and has fired oil filter shell cost, has saved the energy consumption of oil water separator individual heating in the vehicle traveles.

2. The oil supply system is designed into two oil tanks, one of which is a main oil tank, the other is an auxiliary oil tank and is provided with an oil supply and return switching valve, when the external environment temperature is lower and the vehicle is started, the oil supply switching valve and the return switching valve are communicated with the auxiliary oil tank and the engine, oil is supplied by oil in the auxiliary oil tank so that the engine works and the starting process is completed, and the problem of cold starting of the vehicle is solved. After the vehicle runs for a period of time, the temperature of oil in the main oil tank rises along with the heat generated by the water circulation heater, when the temperature reaches a certain value, the oil supply switching valve and the oil return switching valve conduct the main oil tank and the engine, and the main oil tank starts to supply oil for the engine so as to enable the engine to work normally. Greatly reducing the fuel cost.

3. The fuel oil preheating system can adopt a water circulation heating mode or an electric heating mode to heat oil in the oil tank and the fuel oil filter. Preferably, the water inlet and outlet of the engine water tank is utilized to perform a water circulation heating mode, and heat energy is fully utilized. Because the water inlet is connected with the water tank of the engine, the temperature of the water flowing in the shell pass of the water circulation heater is higher, so that the oil in the main oil tank can be heated, and when the temperature of the oil in the main oil tank rises, the oil in the main oil tank can be used for supplying oil to the engine. In addition, water in the shell side can heat the main oil tank, so that oil in the oil tank is heated, the oil is prevented from being solidified in the fuel filter, the flowing of the oil at the fuel filter is smooth, the oil can be better combusted in the engine, the running stability of the vehicle can be improved, the combustion efficiency of the engine is improved, the abrasion of a cold machine of the engine can be reduced, the fuel preheating speed is accelerated, and the switching time of the main oil tank and the auxiliary oil tank is shortened.

4. Be equipped with the heater in the fuel filter, when meetting emergency, when oil is not enough in the main fuel tank, can be through the heater auxiliary heating in the fuel filter, and can not influence the normal start of engine.

Drawings

FIG. 1 is a schematic diagram of a main oil tank oil circuit of the utility model;

FIG. 2 is a schematic diagram of an oil circuit of the auxiliary oil tank of the utility model;

fig. 3 is a schematic perspective view of a first embodiment of the present invention;

FIG. 4 is an enlarged schematic view of portion A of FIG. 3;

FIG. 5 is an enlarged schematic view of portion B of FIG. 3;

fig. 6 is a schematic top view of a first embodiment of the present invention;

fig. 7 is a schematic diagram of a right-view structure of the first embodiment of the present invention;

fig. 8 is a schematic front view structure diagram of a first embodiment of the present invention;

fig. 9 is a schematic cross-sectional structure view of an oil tank according to an embodiment of the present invention;

fig. 10 is a schematic structural diagram of a support plate according to a first embodiment of the present invention;

fig. 11 is a schematic structural diagram of a water circulation heater according to a first embodiment of the present invention; fig. 12 is a schematic diagram of an oil path of a main oil tank according to an embodiment of the present invention;

FIG. 13 is a schematic view of another oil path of a main oil tank according to an embodiment of the present invention;

FIG. 14 is a schematic diagram of an oil path of an auxiliary oil tank according to an embodiment of the present invention;

FIG. 15 is a schematic view of another oil path of an auxiliary oil tank according to an embodiment of the present invention;

fig. 16 is a schematic perspective view of a second embodiment of the present invention;

FIG. 17 is a schematic diagram of an oil path of a main oil tank according to an embodiment of the present invention;

fig. 18 is a schematic diagram of an oil path of an auxiliary oil tank according to an embodiment of the present invention.

The reference numerals in the figures denote:

1. a fuel tank 100, a main fuel tank 101, a secondary fuel tank 102, an inner support plate 103, a partition plate 104, a hole,

2. an oil supply switching valve 3, an oil return switching valve,

4. a fuel filter 400, an oil-water separator 401, a filter,

5. an electric oil pump 6, an oil discharge port 7, an oil filling port 8 and an exhaust port,

9. a fuel oil preheating system 900, a pipe pass channel 901, a water inlet 902 and a water return port,

903. a shell pass channel 904, an oil pumping port 905, an oil outlet,

10. an engine for a vehicle, the engine having a motor,

11. an oil supply pipe, 1100, a main oil supply pipe, 1101, a sub oil supply pipe,

12. an oil return pipe 1200, a main oil return pipe 1201, an auxiliary oil return pipe,

13. a fuel level sensor.

Detailed Description

As shown in the attached figures 1-2, the utility model relates to a diesel vehicle oil tank with a fuel filter inside, which comprises an oil supply system, a fuel preheating system 9 and a fuel filter 4,

the oil supply system comprises an oil tank 1, wherein an oil supply pipe 11 and an oil return pipe 12 are arranged on the oil tank 1, the oil supply pipe 11 and the oil return pipe 12 are used for being connected with an engine oil tank to form a loop, oil in the oil tank 1 can be conveyed to the engine 10 through the oil supply pipe 11 to enable the engine 10 to work, and a part of the residual oil in the engine 10 can be conveyed into the oil return tank 1 through the oil return pipe 12. Fuel filter 4 is connected on 1 fuel feed line 11 of oil tank, and wherein fuel feed line 11 can be divided into two sections, and one section fuel feed line 11 is connected between oil tank 1 and fuel filter 4, and another section fuel feed line 11 is established at 4 exports of fuel filter and is connected with engine 10, offers the die cavity that is used for holding fuel filter 4 on oil tank 1, and fuel filter 4 installs in the die cavity of oil tank 1.

The fuel preheating system 9 is arranged in the oil tank 1, the fuel preheating system 9 comprises a heat exchange element, the oil in the oil tank 1 is heated by heat generated by the heat exchange element, and the heat generated by the heat exchange element can also be transferred to the oil tank 1 to heat the oil filter 4 because the fuel filter 4 is arranged in the oil tank 1.

The oil tank 1 of the oil supply system can be one or two, and in order to reduce the fuel cost, two oil tanks are preferably provided, wherein one oil tank is a main oil tank 100, and the other oil tank is a secondary oil tank 101.

The cavity may be opened at any position of the main oil tank 100, may be opened at one side of the main oil tank 100, or may be opened at the middle position of the main oil tank 100.

The fuel preheating system 9 can heat the oil in the oil tank 1 and the fuel filter 4 by adopting a water circulation heating mode or an electric heating mode.

The working principle of the diesel vehicle fuel tank with the built-in fuel filter of the present invention is described in detail below:

as shown in fig. 2, when the external environment temperature is low and the vehicle is started, the fuel feed switching valve 2 and the fuel return switching valve 3 communicate the secondary fuel tank 101 with the engine 10, and at this time, the oil is fed by the oil in the secondary fuel tank 101 to operate the engine 10 and complete the starting process, so as to solve the problem of cold start of the vehicle. As shown in fig. 1, after the vehicle runs for a period of time, as the water circulation heater generates heat, the temperature of oil in the main oil tank 100 rises, and when a certain temperature is reached, the oil supply switching valve 2 and the oil return switching valve 3 conduct the main oil tank 100 and the engine 10, and the main oil tank 100 starts to supply oil to the engine 10 so that the engine 10 works normally.

Once the vehicle is in failure, maintained and stopped, the main oil tank 100 is switched to the auxiliary oil tank 101 for supplying oil, so that when the engine 10 is shut down, the internal oil circuit is filled with low-grade diesel oil in the auxiliary oil tank 101, and the next time the vehicle is started quickly.

It should be noted that the schematic diagram of the oil circuit shown in fig. 1 and 2 is only for facilitating understanding of the technical solution of the present invention, and is not intended to limit the installation manner of each component.

The technical solution of the present invention in the embodiment of the diesel vehicle fuel tank with a built-in fuel filter will be clearly and completely described below with reference to specific embodiments, and it is obvious that the described embodiments are only some embodiments of the present invention, but not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.

Example one

With reference to fig. 3-8, the utility model discloses a built-in diesel vehicle oil tank that has fuel filter, including oil feeding system, fuel preheating system 9, fuel filter 4.

The oil supply system comprises two oil tanks 1, namely a main oil tank 100 and an auxiliary oil tank 101, wherein the volume of the main oil tank 100 is obviously larger than that of the auxiliary oil tank 101. The main oil tank 100 is provided with a main oil supply pipe 1100 which is connected with an auxiliary oil supply pipe 1101 on the auxiliary oil tank 101 through an oil supply switching valve 2, the main oil tank 100 is also provided with a main oil return pipe 1200 which is connected with an auxiliary oil return pipe 1201 on the auxiliary oil tank 101 through an oil return switching valve 3, the main oil supply pipe 1100 and the main oil return pipe 1200 form a loop through an engine oil tank, the main oil tank 100 is provided with a cavity for accommodating the fuel oil filter 4, the cavity is arranged at one side of the main oil tank 100 and is far away from the auxiliary oil tank 101, and the fuel oil filter 4 is arranged in the cavity of the main oil.

Wherein, the main fuel tank 100 is internally provided with a high-grade fuel tank 1, and the auxiliary fuel tank 101 is internally provided with a low-grade fuel tank 1. The auxiliary fuel tank 101 may be used as the auxiliary fuel tank 1 of the high-grade fuel tank 1 in a season of high temperature.

The auxiliary fuel tank 101 is installed to be hung outside the main fuel tank 100 or to be integrated with the main fuel tank 100. The secondary fuel tank 101 may be separately manufactured and hung outside the main fuel tank 100 or separated from the primary fuel tank 100 by inserting a partition 103.

Referring to fig. 9 and 10, in the present embodiment, the main oil tank 100 and the secondary oil tank 101 are integrated, and the main oil tank 100 and the secondary oil tank 101 are provided with the oil filling port 7, the air exhaust port 8 and the oil discharge port 6. Can refuel in 7 to oil tank 1 through the oiling mouth, through gas vent 8 with the gaseous exhaust in 1 oil tank, avoid the vehicle operation unstable, open oil discharge 6, can be with the interior fluid discharge that does not take out of oil tank 1. Separate mutually through baffle 103 between main oil tank 100, the bellytank 101, be equipped with two piece internal support plates 102 in the main oil tank 100, interior trompil 104 on the support plate 102 communicates main oil tank 100, sets up two piece internal support plates 102 and is used in: firstly, play the cushioning effect, prevent that fluid and main tank 100 collision when the vehicle brakes from producing too much bubble, secondly will avoid fluid direct impact oiling mouth 7, prevent that fluid from flowing from oiling mouth 7 collision, thirdly play the supporting role, improve the holistic mechanical strength of oil tank 1.

The oil supply switching valve 2 and the oil return switching valve 3 can be used for controlling the on-off of the engine 10 and the main oil tank 100 and the auxiliary oil tank 101. When the external environment temperature is low and the vehicle is started, the oil supply switching valve 2 and the oil return switching valve 3 can conduct the auxiliary oil tank 101 and the engine 10, at the moment, because the freezing point of oil in the auxiliary oil tank 101 is low, the oil in the auxiliary oil tank 101 cannot be frozen, and therefore the oil can be supplied to the engine 10 through the main oil supply pipe 1100, the engine 10 can work, the starting process can be completed, and the problem of cold start of the vehicle is solved. After the vehicle runs for a period of time, as the heat exchange element heats up and releases heat, the temperature of oil in the main oil tank 100 rises, and the oil supply switching valve 2 and the oil return switching valve 3 can conduct the main oil tank 100 and the engine 10, so that the main oil tank 100 can start to supply oil to the engine 10.

The oil supply switching valve 2 and the oil return switching valve 3 are two-position three-way electromagnetic valves, and can also be replaced by two-way electromagnetic valves or manual stop valves.

On the basis of the above structure, the fuel filter 4 includes an oil-water separator 400 and a filter 401, the oil-water separator 400 is used for separating oil from water in the oil liquid, and the filter 401 is used for removing impurities in the oil liquid. Preferably, the oil-water separator 400 outlet and the filter 401 both adopt a replaceable filter element type structure, so that the filter elements can be conveniently replaced and disassembled, and an electric oil pump 5 and auxiliary pump oil are connected between the oil-water separator 400 outlet and the filter 401 inlet. In practice, the oil-water separator 400 and the filter 401 may be used in combination or in combination, and the combined use effect of the two is most preferable.

With reference to fig. 11, on the basis of the above structure, the heat exchange element of the fuel preheating system 9 is a water circulation heater, the water circulation heater is disposed in the oil tank 1, the water circulation heater is provided with a tube pass channel 900 and a shell pass channel 903, the tube pass channel 900 is provided with a water inlet 901 and a water return port 902, the shell pass channel 903 is provided with an oil pumping port 904 and an oil outlet 905, the water inlet 901 and the water return port 902 are used for being connected with an engine water tank to form a loop, the oil pumping port 904 is connected with the oil tank 1, and the oil outlet 905 is connected with the oil supply pipe 11. Because the water inlet 901 is connected with the engine water tank, the temperature of the water flowing in the shell pass of the water circulation heater is higher, so that the oil in the main oil tank 100 can be heated, and when the temperature of the oil in the main oil tank 100 rises, the oil in the main oil tank 100 can be used for supplying oil to the engine 10. In addition, water in the shell pass can heat the main oil tank 100, so that oil in the oil tank 1 can be heated, the oil is prevented from being solidified in the fuel filter 4, and the smooth flowing of the oil at the fuel filter 4 is ensured.

Besides the water circulation heating method, the fuel preheating system 9 may also adopt an electric heating method, for example, an electric heater is built in to heat the oil in the oil tank 1 and the fuel filter 4.

Preferably, the fuel preheating system 9 is disposed at a side of the main fuel tank 100 close to the cavity, that is, the fuel preheating system 9 is disposed at a side close to the fuel filter 4, so as to shorten an oil path, reduce heat loss of oil in a supply process as much as possible, and enable heat transfer between the fuel preheating system 9 and the fuel filter 4 to be more sufficient.

In addition to the above configuration, the fuel level sensors 13 are provided in the main tank 100 and the sub-tank 101. The fuel level sensor 13 is of a float structure.

On the basis of the structure, a heater is arranged in the fuel filter 4 and used for auxiliary heating. The heater structure and installation method can adopt the structure and method known in the art, and are not described in detail herein. Normally, the heater is not operated. The heater is designed to assist in heating when an emergency occurs, such as insufficient oil in the main oil tank 100, and will not affect the normal start of the engine 10.

The working principle of the diesel vehicle fuel tank with a built-in fuel filter according to the present invention will be described in detail with reference to the accompanying drawings 12-15:

the force for pumping the oil in the tank 1 is derived from the engine 10 on the one hand and the electric oil pump 5 on the other hand. When the external environment temperature is low and the vehicle is started, the oil supply switching valve 2 and the oil return switching valve 3 conduct the auxiliary oil tank 101 and the engine 10, oil is supplied by oil liquid in the auxiliary oil tank 101 at the moment, so that the engine 10 works and the starting process is finished, and the problem of cold starting of the vehicle is solved. After the vehicle runs for a period of time, the temperature of the oil in the main oil tank 100 rises as the water circulation heater generates heat, when a certain temperature is reached, the oil supply switching valve 2 and the oil return switching valve 3 conduct the main oil tank 100 and the engine 10, and the main oil tank 100 starts to supply oil to the engine 10 so that the engine 10 works normally.

Because the water inlet 901 is connected with the engine water tank, the temperature of the water flowing in the shell pass of the water circulation heater is higher, so that the oil in the main oil tank 100 can be heated, and when the temperature of the oil in the main oil tank 100 rises, the oil in the main oil tank 100 can be used for supplying oil to the engine 10. In addition, water in the shell side can heat main oil tank 100, thereby can be so that the fluid in the oil tank 1 is heated, thereby prevent that fluid from solidifying in fuel filter 4, guarantee that fluid is smooth and easy in the flow of fuel filter 4 department, can make fluid better burning in engine 10, and then can improve the stability of traveling of vehicle, improve engine 10's combustion efficiency, can also reduce the cold machine wearing and tearing of engine 10, accelerate the fuel preheating speed, shorten main oil tank 100, bellytank 101 change-over time.

When an emergency situation occurs, such as insufficient oil in the main oil tank 100, the heater in the fuel filter 4 can assist heating without affecting the normal start of the engine 10.

Example two

With reference to fig. 16-18, the second embodiment is the same as the first embodiment, except that, in order to simplify the oil path, the cavity is formed in the middle of the main oil tank 100, so that not only can the oil in the main oil tank 100 be heated, but also the heat generated by the heat exchange element of the fuel preheating system 9 can be transferred to the oil tank 1 to heat the oil filter 4, and also the oil in the auxiliary oil tank 101 can be heated, thereby shortening the cold start time of the engine 10.

While the preferred embodiments of the present application have been described, additional variations and modifications in those embodiments may occur to those skilled in the art once they learn of the basic inventive concepts. Therefore, it is intended that the appended claims be interpreted as including preferred embodiments and all alterations and modifications as fall within the scope of the application.

It will be apparent to those skilled in the art that various changes and modifications may be made in the present application without departing from the spirit and scope of the application. Thus, if such modifications and variations of the present application fall within the scope of the claims of the present application and their equivalents, the present application is intended to include such modifications and variations as well.

In addition to the technical features described in the specification, the technology is known to those skilled in the art.

Claims

1. A diesel vehicle oil tank with a built-in fuel filter is characterized by comprising an oil supply system, a fuel preheating system (9) and a fuel filter (4),

the fuel supply system comprises a fuel tank (1), wherein a fuel supply pipe (11) and a fuel return pipe (12) are arranged on the fuel tank (1), the fuel supply pipe (11) and the fuel return pipe (12) are used for being connected with the fuel tank of the engine to form a loop, and a cavity for accommodating the fuel filter (4) is formed in the fuel tank (1);

the fuel filter (4) is connected to an oil supply pipe (11) of the oil tank (1), and the fuel filter (4) is arranged in a cavity of the oil tank (1);

the fuel preheating system (9) is arranged in the fuel tank (1), the fuel preheating system (9) comprises a heat exchange element, and the heat generated by the heat exchange element is used for heating the oil liquid in the fuel tank (1) and the fuel filter (4).

2. The diesel vehicle oil tank with the built-in fuel filter of claim 1, wherein the heat exchange element is a water circulation heater, the water circulation heater is arranged in the oil tank (1), the water circulation heater is provided with a tube pass channel (900) and a shell pass channel (903), the tube pass channel (900) is provided with a water inlet (901) and a water return port (902), the shell pass channel (903) is provided with an oil pumping port (904) and an oil outlet (905), the water inlet (901) and the water return port (902) are used for being connected with an engine water tank to form a loop, the oil pumping port (904) is connected with the oil tank (1), and the oil outlet (905) is connected with the oil supply pipe (11).

3. The diesel vehicle fuel tank with the built-in fuel filter is characterized in that the fuel preheating system (9) adopts an electric heating mode, and the built-in electric heater is used for heating the oil in the fuel tank (1) and the fuel filter (4).

4. The diesel vehicle oil tank with the built-in fuel filter as claimed in claim 1, 2 or 3, wherein the number of the oil tanks (1) of the oil supply system is two, and the two oil tanks are respectively a main oil tank (100) and an auxiliary oil tank (101), the main oil tank (100) is provided with a main oil supply pipe (1100) which is connected with the auxiliary oil supply pipe (1101) on the auxiliary oil tank (101) through an oil supply switching valve (2), the main oil tank (100) is further provided with a main oil return pipe (1200) which is connected with the auxiliary oil return pipe (1201) on the auxiliary oil tank (101) through an oil return switching valve (3), the main oil tank (100) is provided with a cavity for accommodating the fuel filter (4), and the fuel filter (4) is installed in the cavity of the main oil tank (100).

5. The diesel vehicle fuel tank with the built-in fuel filter as claimed in claim 4, wherein the auxiliary fuel tank (101) is installed by separately processing the auxiliary fuel tank (101) and hanging the auxiliary fuel tank (101) outside the main fuel tank (100) or inserting a partition (103) into the original main fuel tank (100) to divide the auxiliary fuel tank (101).

6. The diesel vehicle fuel tank with a built-in fuel filter of claim 4, wherein the main fuel tank (100) is provided with two inner support plates (102), and the inner support plates (102) are provided with holes (104) for communicating the main fuel tank (100).

7. The diesel vehicle fuel tank with the built-in fuel filter of claim 4, wherein the fuel supply switching valve (2) and the oil return switching valve (3) are two-position three-way valves.

8. A diesel vehicle fuel tank with built-in fuel filter according to claim 1, 2, 3, 5, 6 or 7, characterized in that the fuel filter (4) comprises an oil-water separator (400) and/or a filter (401).

9. A diesel vehicle fuel tank with a built-in fuel filter according to claim 1, 2, 3, 5, 6 or 7, characterized in that the fuel preheating system (9) is provided in the fuel tank (1) on the side close to the fuel filter (4).

10. The diesel vehicle fuel tank with the built-in fuel filter as claimed in claim 1, 2, 3, 5, 6 or 7, wherein a heater is arranged in the fuel filter (4) to realize auxiliary heating.

11. A diesel vehicle fuel tank with a built-in fuel filter according to claim 1, 2, 3, 5, 6 or 7, characterized in that the electric oil pump (5) is installed on the oil supply pipe (11) of the fuel tank (1).