Diesel heating system

Abstract

The utility model provides a kind of diesel heating system, including oil tank, fuel heater, coolant heater, circulating pump and engine, the fuel heater is inserted into oil tank, the inlet of fuel heater is connected the outlet of coolant heater by coolant pipeline, the outlet of fuel heater is connected the coolant inlet of engine by coolant pipeline, the coolant outlet of engine is connected the inlet of circulating pump by coolant pipeline, the outlet of circulating pump is connected the inlet of coolant heater by coolant pipeline.Using the utility model, coolant is heated by coolant heater, and the heated coolant heats the fuel in oil tank by fuel heater, which avoids the subsequent blockage of filter and other equipment caused by diesel low-temperature waxing, ensuring the normal operation of the engine;coolant directly heats the engine, avoiding wear caused by cold start of the engine and prolonging the service life of the engine.

Description

Technical Field

[0001] This utility model relates to the technical field of diesel fuel supply systems for agricultural machinery, and specifically to a diesel heating system. Background Technology

[0002] Tractors, as an important tool in modern agricultural mechanization, need to operate in various climatic conditions. In cold winter regions, the fuel supply system of tractor diesel engines is prone to condensation and wax buildup, which prevents diesel fuel from flowing smoothly and thus affects the normal starting of the diesel engine.

[0003] When the engine is running, diesel fuel passes through an oil filter, then a high-pressure pump, and finally the injectors before being injected into the cylinders. When the diesel fuel temperature drops to its freezing point, wax crystals form and clog the oil filter, affecting the normal fuel supply and thus impacting engine operation. Therefore, in cold winter regions, lower-grade diesel fuel, which is less prone to waxing, is generally used. However, lower-grade diesel fuel is generally more expensive than higher-grade diesel. For example, if a tractor operates for 12 hours a day and consumes 400 liters of diesel, using lower-grade diesel would cost approximately 400 yuan more, making it less economical.

[0004] Furthermore, related studies have shown that 60% of engine wear is caused by cold starts, so avoiding cold starts is of great significance for extending engine life. Utility Model Content

[0005] To solve at least one of the above technical problems, this utility model provides a diesel heating system.

[0006] The technical solution of this utility model to solve the above-mentioned technical problems is as follows:

[0007] This utility model provides a diesel heating system, including a fuel tank, a fuel heater, a coolant heater, a circulation pump, and an engine. The fuel heater extends into the fuel tank. The inlet of the fuel heater is connected to the outlet of the coolant heater through a coolant pipeline. The outlet of the fuel heater is connected to the coolant inlet of the engine through a coolant pipeline. The coolant outlet of the engine is connected to the inlet of the circulation pump through a coolant pipeline. The outlet of the circulation pump is connected to the inlet of the coolant heater through a coolant pipeline.

[0008] The beneficial effects of this utility model are:

[0009] This invention utilizes a coolant heater to heat the coolant, which then flows sequentially through a fuel heater and the engine. The fuel heater heats the fuel in the fuel tank, preventing the diesel fuel from waxing at low temperatures and clogging subsequent equipment such as the oil filter, thus ensuring the normal operation of the engine. Consequently, high-grade diesel fuel can be used, improving the tractor's economic efficiency. At the same time, the coolant directly heats the engine, preventing wear caused by cold starts and extending engine life.

[0010] Based on the above technical solution, the present invention can be further improved as follows.

[0011] Furthermore, it also includes a fuel suction pipe, one end of which extends into the fuel heater and connects to the inside of the fuel tank, and the other end of which is connected to a vehicle fuel filter via a fuel line. The vehicle fuel filter is connected to a fuel pump via a fuel line, and the fuel pump is connected to the engine's fuel inlet via a fuel line.

[0012] This design allows the engine to draw fuel from near the fuel heater. Once the condensed wax on the fuel around the fuel heater has disappeared, the engine can be started. This means that the fuel pump can supply the engine with fuel at a sufficient temperature within a shorter period of operation of the coolant heater, improving engine starting efficiency and reducing the energy consumed by heating the fuel before starting the engine.

[0013] Furthermore, it also includes a return oil pipe, one end of which extends into the fuel heater and connects to the inside of the fuel tank, while the other end of the return oil pipe is connected to the engine's return oil port via a fuel line.

[0014] When the engine is running, the return oil pipe can help increase the oil suction temperature of the suction pipe, preventing the fuel from waxing in subsequent lines; the fuel in the fuel tank starts to heat up from the fuel heater and spreads outward, eventually eliminating all fuel wax.

[0015] Furthermore, the lower end of the fuel heater is provided with a downwardly extending cylindrical protrusion, and the lower ends of the oil suction pipe and the oil return pipe both extend into the cylindrical protrusion and communicate with the inside of the fuel tank.

[0016] When the engine is started, the remaining fuel in the engine fuel supply system flows back to the fuel tank through the return fuel line. The engine return fuel temperature is higher than the engine inlet fuel temperature. The cylindrical protrusion allows the fuel suction line to draw in the high-temperature fuel, preventing the fuel from waxing in subsequent lines.

[0017] Furthermore, a downwardly extending baffle is fixed inside the fuel heater, with a gap between the lower end of the baffle and the lower end of the fuel heater; the oil suction pipe and the inlet of the fuel heater are located on one side of the baffle, and the oil return pipe and the outlet of the fuel heater are located on the other side of the baffle.

[0018] The coolant enters from the inlet of the fuel heater, flows through the area where the oil suction pipe is located, and then flows from the underside of the baffle to the area where the oil return pipe is located, thereby heating the oil suction pipe and the oil return pipe in sequence, increasing the oil suction temperature, and making full use of the heat of the coolant.

[0019] Furthermore, the upper end of the fuel heater is also provided with a thickening head, and the upper ends of the oil suction pipe and the oil return pipe both extend from the side of the thickening head. The inlet and outlet of the fuel heater are both located on the side of the thickening head.

[0020] The thickened head increases the heat exchange area between the fuel suction pipe and the return pipe and the coolant, while ensuring that the fuel and coolant exchange heat in countercurrent flow, thus improving heat exchange efficiency. In addition, the lower end of the thickened head can also be used to make sealing contact with the top of the fuel tank, improving the fuel tank's sealing performance.

[0021] Furthermore, it also includes a parking oil filter and a fuel supply pump. The inlet of the parking oil filter is connected to the suction pipe through a fuel line, and the outlet of the parking oil filter is connected to the inlet of the fuel supply pump through a fuel line. The outlet of the fuel supply pump is connected to the fuel inlet of the coolant heater through a fuel line.

[0022] The system purifies fuel through a parking oil filter, draws fuel from the fuel pump, and supplies fuel to the coolant heater. This allows the fuel in the tank to be burned to heat the coolant, eliminating the need for a backup power source. The system has a simple and compact structure.

[0023] Furthermore, heating wires are provided on the fuel line from the oil suction pipe to the vehicle fuel filter and on the fuel line from the oil suction pipe to the engine; electric heating sleeves are fitted on both the vehicle fuel filter and the parking fuel filter.

[0024] It facilitates the rapid heating and dissolution of oil wax in the fuel lines, driving oil filter, and parking oil filter via electric heating, ensuring unobstructed fuel intake lines for the engine; at the same time, it can reduce the waiting time for engine starting by electrically heating the fuel in the lines, thereby improving engine starting efficiency.

[0025] Furthermore, it also includes a pipeline heating controller, a coolant heating controller, and a vehicle controller. The pipeline heating controller and the coolant heating controller are respectively connected to the vehicle controller via signal; the heating wire and the heating sleeve are respectively connected to the pipeline heating controller via signal; and the coolant heater, the circulation pump, and the oil supply pump are respectively connected to the coolant heating controller via signal.

[0026] It allows for separate control of heating or stopping of coolant, fuel lines and oil filter, saving energy and providing convenient control.

[0027] Furthermore, the coolant outlet of the engine is also connected to a three-way valve. The first outlet of the three-way valve is connected to an air conditioning heater. The second outlet of the three-way valve and the liquid outlet of the air conditioning heater are connected to each other through a coolant pipeline and connected to the inlet of the circulation pump.

[0028] When a quick engine start is required, the three-way valve can be operated to the second outlet to discharge coolant, and the heat from the coolant heater will be used to heat the fuel, reducing the time required to start the engine. When the cab needs to be heated, the three-way valve can be operated to the first outlet to discharge coolant, and the air conditioning heater can use the heat from the coolant to heat the cab. This improves flexibility and driving comfort. Attached Figure Description

[0029] Figure 1 This is a schematic diagram of the structure of this utility model.

[0030] Figure 2 This is a schematic diagram of a fuel oil heater.

[0031] In the accompanying drawings, the technical features represented by each reference numeral are as follows:

[0032] 1-Fuel tank; 2-Fuel heater; 21-Cylindrical protrusion; 22-Baffle; 23-Thickened head; 3-Fuel suction pipe; 31-Fuel return pipe; 4-Coolant heater; 41-Combustion chamber; 42-Fire tube; 43-Jacket; 44-Glow plug; 45-Blower; 5-Circulation pump; 6-Engine; 7-Route oil filter; 8-Fuel pump; 9-Three-way valve; 10-Air conditioning heater; 11-Parking oil filter; 12-Fuel supply pump; 13-Heating wire; 14-Pipeline heating controller; 15-Coolant heating controller; 16-Vehicle controller. Detailed Implementation

[0033] The principles and features of this utility model are described below with reference to the accompanying drawings. The examples given are only for explaining this utility model and are not intended to limit the scope of this utility model.

[0034] This utility model refers to Figure 1-2 .

[0035] This utility model provides a diesel heating system, including a fuel tank 1, a fuel heater 2, a coolant heater 4, a circulation pump 5, and an engine 6. The fuel heater 2 extends into the fuel tank 1. The inlet of the fuel heater 2 is connected to the outlet of the coolant heater 4 through a coolant pipeline. The outlet of the fuel heater 2 is connected to the coolant inlet of the engine 6 through a coolant pipeline. The coolant outlet of the engine 6 is connected to the inlet of the circulation pump 5 through a coolant pipeline. The outlet of the circulation pump 5 is connected to the inlet of the coolant heater 4 through a coolant pipeline.

[0036] principle:

[0037] Before starting the engine 6, the circulation pump 5 operates first, causing the coolant in the engine 6 to circulate sequentially through the coolant heater 4, fuel heater 2, engine 6, and circulation pump 5. During circulation, the coolant heater 4 heats the coolant, which then flows to the fuel heater 2, which extends into the fuel tank 1, thereby preheating the fuel in the fuel tank 1 using the heat from the coolant. Once the fuel is preheated to a temperature suitable for normal engine starting, the driver can start the engine 6. After the engine 6 starts, since it generates its own heat to heat the coolant, the coolant heater 4 can stop heating when the engine 6 generates sufficient heat.

[0038] Note: Coolant piping refers to the type of piping used to transport coolant; fuel piping refers to the type of piping used to transport fuel oil. The coolant heater 4 can be an oil-fired boiler or an electric heater.

[0039] By employing this utility model, the coolant is heated by the coolant heater 4, and the heated coolant flows sequentially through the fuel heater 2 and the engine 6. The fuel heater 2 heats the fuel in the fuel tank 1, preventing the diesel fuel from waxing at low temperatures and clogging subsequent equipment such as the oil filter, thus ensuring the normal operation of the engine 6. As a result, high-grade diesel fuel can be used, improving the economic efficiency of the tractor. At the same time, the coolant directly heats the engine 6, avoiding wear caused by cold starts and extending the life of the engine 6.

[0040] Furthermore, it also includes a fuel suction pipe 3, one end of which extends into the fuel heater 2 and communicates with the inside of the fuel tank 1. The other end of the fuel suction pipe 3 is connected to a vehicle fuel filter 7 through a fuel line. The vehicle fuel filter 7 is connected to a fuel pump 8 through a fuel line. The fuel pump 8 is connected to the fuel inlet of the engine 6 through a fuel line.

[0041] This allows the engine 6 to draw fuel from the vicinity of the fuel heater 2. Once the condensed wax on the fuel around the fuel heater 2 disappears, the engine 6 can be started. This allows the fuel pump 8 to supply fuel at a sufficient temperature to the engine 6 within a shorter working time of the coolant heater 4, improving the starting efficiency of the engine 6 and reducing the energy consumed by heating the fuel before starting the engine 6.

[0042] Furthermore, it also includes a return oil pipe 31, one end of which extends into the fuel heater 2 and communicates with the inside of the fuel tank 1, and the other end of the return oil pipe 31 is connected to the return oil port of the engine 6 through a fuel line.

[0043] When the engine 6 is working, the return oil pipe 31 can help increase the oil suction temperature of the oil suction pipe 3, thus preventing the fuel from waxing in the subsequent pipelines; the fuel in the fuel tank 1 starts to heat up continuously from the fuel heater 2 and spreads outward, eventually eliminating all fuel wax.

[0044] Furthermore, the lower end of the fuel heater 2 is provided with a downwardly extending cylindrical protrusion 21, and the lower ends of the oil suction pipe 3 and the oil return pipe 31 both extend into the cylindrical protrusion 21 and communicate with the inside of the fuel tank 1.

[0045] When the engine 6 is started, the remaining fuel in the fuel supply system of the engine 6 flows back to the fuel tank 1 through the return oil pipe 31. The return oil temperature of the engine 6 is higher than the inlet oil temperature of the engine 6. Through the cylindrical protrusion 21, the oil suction pipe 3 draws in the high-temperature fuel, which avoids the fuel from waxing in the subsequent pipeline.

[0046] Furthermore, a downwardly extending baffle 22 is fixed inside the fuel heater 2, and there is a gap between the lower end of the baffle 22 and the lower end of the fuel heater 2; the oil suction pipe 3 and the inlet of the fuel heater 2 are located on one side of the baffle 22, and the oil return pipe 31 and the outlet of the fuel heater 2 are located on the other side of the baffle 22.

[0047] The coolant enters from the inlet of the fuel heater 2 and flows through the area where the oil suction pipe 3 is located. Then it flows from the underside of the baffle 22 to the area where the oil return pipe 31 is located, thereby heating the oil suction pipe 3 and the oil return pipe 31 in sequence, increasing the oil suction temperature and making full use of the heat of the coolant.

[0048] Furthermore, the upper end of the fuel heater 2 is also provided with a thickening head 23, and the upper ends of the oil suction pipe 3 and the oil return pipe 31 both extend from the side of the thickening head 23. The inlet and outlet of the fuel heater 2 are both located on the side of the thickening head 23.

[0049] The thickened head 23 facilitates the increase of the heat exchange area between the oil suction pipe 3 and the return pipe 31 and the coolant, while ensuring that the fuel and coolant exchange heat in countercurrent flow, thus improving the heat exchange efficiency. In addition, the lower end of the thickened head 23 can also be used to make sealing contact with the top of the fuel tank 1, thereby improving the sealing performance of the fuel tank 1.

[0050] Furthermore, it also includes a parking oil filter 11 and a fuel supply pump 12. The inlet of the parking oil filter 11 is connected to the suction pipe 3 through a fuel line, and the outlet of the parking oil filter 11 is connected to the inlet of the fuel supply pump 12 through a fuel line. The outlet of the fuel supply pump 12 is connected to the fuel inlet of the coolant heater 4 through a fuel line.

[0051] Note: The coolant heater 4 can be an oil-fired boiler. Specifically, the coolant heater 4 includes a jacket 43, with a combustion chamber 41 and a fire tube 42 inside the jacket 43. The combustion chamber 41 is connected to the fire tube 42, and one end of the fire tube 42 is connected to the outside of the jacket 43. A glow plug 44 is also fixed inside the jacket 43, extending into the combustion chamber 41. The inlet and outlet of the coolant heater 4 are both located on the jacket 43. An atomizing nozzle is provided on the fuel line at the outlet of the fuel pump 12, extending into the combustion chamber 41. The fuel mixes and burns with air in the combustion chamber 41, and the resulting flame and high-temperature flue gas enter the fire tube 42, thereby heating the coolant in the jacket. Preferably, a blower 45 is also included, with its outlet connected to the combustion chamber 41. This facilitates the supply of air to the combustion chamber 41, allowing the air to mix and burn with the fuel. In addition, the outlet end of the fuel suction pipe 3 is connected to the vehicle fuel filter 7 and the parking fuel filter 11 via branch lines.

[0052] The fuel is purified by the parking oil filter 11, and the fuel pump 12 draws in the fuel and supplies it to the coolant heater 4. This allows the fuel in the fuel tank 1 to be burned to heat the coolant. No backup power is required, and the system has a simple and compact structure.

[0053] Furthermore, heating wires 13 are respectively provided on the fuel line from the oil suction pipe 3 to the vehicle oil filter 7 and on the fuel line from the oil suction pipe 3 to the engine 6; electric heating sleeves are fitted on both the vehicle oil filter 7 and the parking oil filter 11.

[0054] Note: The heating wire 13 may be wound around the fuel line; preferably, the heating wire 13 is embedded in the fuel line; or the fuel line has a multi-layer structure, and the heating wire 13 is located between the inner and outer layers of the fuel line.

[0055] The electric heating system facilitates the rapid heating and dissolution of oil wax in the fuel lines, the vehicle fuel filter 7, and the parking fuel filter 11, ensuring unobstructed fuel inlet in the engine 6. At the same time, the electric heating of the fuel in the lines reduces the waiting time for the engine 6 to start, thus improving the starting efficiency of the engine 6.

[0056] Furthermore, it also includes a pipeline heating controller 14, a coolant heating controller 15, and a vehicle controller 16. The pipeline heating controller 14 and the coolant heating controller 15 are respectively connected to the vehicle controller 16 via signals; the heating wire 13 and the heating sleeve are respectively connected to the pipeline heating controller 14 via signals; and the coolant heater 4, the circulation pump 5, and the oil supply pump 12 are respectively connected to the coolant heating controller 15 via signals.

[0057] In this embodiment, specifically, the blower 45 and glow plug 44 of the coolant heater 4 are respectively connected to the coolant heating controller 15 via signal connections. The vehicle controller 16 is the control center of the tractor and is considered prior art. The vehicle controller 16 can receive external remote control signals, thereby sending signals to control the pipeline heating controller 14 and the coolant heating controller 15; the pipeline heating controller 14 can control the heating wire 13 and the heating sleeve to work / stop, and the coolant heating controller 15 can control the coolant heater 4, the circulation pump 5, and the oil supply pump 12 to work / stop. Both the pipeline heating controller 14 and the coolant heating controller 15 can be existing products such as PLC controllers and relay controllers.

[0058] It allows for separate control of heating or stopping of coolant, fuel lines and oil filter, saving energy and providing convenient control.

[0059] Furthermore, the coolant outlet of the engine 6 is also connected to a three-way valve 9. The first outlet of the three-way valve 9 is connected to an air conditioning heater 10. The second outlet of the three-way valve 9 and the liquid outlet of the air conditioning heater 10 are merged through a coolant pipeline and connected to the inlet of the circulation pump 5.

[0060] Note: The air conditioning heater 10 is a component of the cab air conditioning system and is existing technology. The second outlet of the three-way valve 9 is provided with a first branch pipe, the liquid outlet of the air conditioning heater 10 is provided with a second branch pipe, and the inlet of the circulation pump 5 is provided with a connecting pipe. The first branch pipe, the second branch pipe, and the connecting pipe are connected by a three-way valve.

[0061] When the engine 6 needs to be started quickly, the three-way valve 9 can be operated to the second outlet to discharge coolant, and the heat from the coolant heater 4 is used to heat the fuel, reducing the time required to start the engine 6. When the cab needs to be heated, the three-way valve 9 can be operated to the first outlet to discharge coolant, and the air conditioning heater 10 can use the heat from the coolant to heat the cab. This improves flexibility and driving comfort.

[0062] In the description of this utility model, it should be understood that if descriptive terms indicating orientation, direction, or positional relationship appear, such as "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," "circumferential," etc., the orientation or positional relationship indicated in this specification is based on the orientation or positional relationship shown in the accompanying drawings. It is only for the convenience of understanding this utility model and simplifying the description, and does not indicate or imply that the part, element, or whole referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, it should not be construed as a limitation of this utility model.

[0063] Furthermore, if sequential descriptive terms such as "first," "second," etc., appear, their purpose in this specification is for ease of understanding or simplification. For example, to distinguish multiple technical features of the same type or function, which must be mentioned separately, this specification may use prefixes or suffixes to differentiate them. Therefore, they should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, features defined with "first," "second," etc., may explicitly or implicitly include at least one of those features. In the description of this utility model, "multiple" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0064] In this utility model, if descriptive terms describing structural relationships are used, such as "installation," "connection," "joining," and "fixing," they should be interpreted broadly unless otherwise explicitly specified and limited. For example, "installation," "connection," and "joining" can refer to a fixed connection, a detachable connection, or an integral connection; it can be a direct connection or an indirect connection through an intermediate medium; it can refer to the internal communication of two components or the interaction between two components. "Fixing" can refer to an integral fixation or a detachable fixation using fasteners; it can be a direct fixation or a fixation through an intermediate medium. For those skilled in the art, the specific meaning of the above descriptive terms in this utility model can be understood based on the specific circumstances, the context, and the coherence of the preceding and following text.

[0065] In this utility model, if descriptive terms containing subordinate or connecting meanings appear, such as "above" or "below" the second feature, they should not be interpreted restrictively unless otherwise explicitly specified and limited. For example, "above" or "below" can mean that the first and second features are in direct contact, or that the first and second features are in indirect contact through an intermediate medium. For those skilled in the art, the specific meaning of the above descriptive terms in this utility model can be understood according to the specific circumstances, the context, and the coherence of the preceding and following text.

[0066] Furthermore, "above," "on top of," and "above" the first feature in relation to the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "under," and "below" the first feature in relation to the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0067] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the present invention. The illustrative expressions of the above terms in this specification do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments, examples, and features described in this specification, and such combinations or integrations should all fall within the scope of the present invention.

[0068] Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention. Variations, modifications, substitutions, and modifications made by those skilled in the art to the above embodiments within the scope of information available through public channels and in conjunction with the technical teachings given in this application are still covered within the protection scope of this application.

Claims

1. A diesel heating system characterised in that: The system includes a fuel tank (1), a fuel heater (2), a coolant heater (4), a circulation pump (5), and an engine (6). The fuel heater (2) extends into the fuel tank (1). The inlet of the fuel heater (2) is connected to the outlet of the coolant heater (4) through a coolant pipeline. The outlet of the fuel heater (2) is connected to the coolant inlet of the engine (6) through a coolant pipeline. The coolant outlet of the engine (6) is connected to the inlet of the circulation pump (5) through a coolant pipeline. The outlet of the circulation pump (5) is connected to the inlet of the coolant heater (4) through a coolant pipeline.

2. The diesel heating system according to claim 1, characterized in that: It also includes a suction pipe (3), one end of which extends into the fuel heater (2) and communicates with the inside of the fuel tank (1). The other end of the suction pipe (3) is connected to a vehicle fuel filter (7) through a fuel line. The vehicle fuel filter (7) is connected to a fuel pump (8) through a fuel line. The fuel pump (8) is connected to the fuel inlet of the engine (6) through a fuel line.

3. The diesel heating system according to claim 2, characterized in that: It also includes a return oil pipe (31), one end of which extends into the fuel heater (2) and is connected to the inside of the fuel tank (1), and the other end of the return oil pipe (31) is connected to the return oil port of the engine (6) through the fuel line.

4. The diesel heating system according to claim 3, characterized in that: The lower end of the fuel heater (2) is provided with a downwardly extending cylindrical protrusion (21). The lower ends of the oil suction pipe (3) and the oil return pipe (31) both extend into the cylindrical protrusion (21) and communicate with the inside of the oil tank (1).

5. The diesel heating system according to claim 4, characterized in that: The fuel heater (2) is also fixed with a downwardly extending baffle (22), and there is a gap between the lower end of the baffle (22) and the lower end of the fuel heater (2); the inlet of the oil suction pipe (3) and the fuel heater (2) is located on one side of the baffle (22), and the outlet of the oil return pipe (31) and the fuel heater (2) is located on the other side of the baffle (22).

6. The diesel heating system according to claim 5, characterized in that: The fuel heater (2) is also provided with a thickening head (23) at the upper end. The upper end of the oil suction pipe (3) and the upper end of the oil return pipe (31) both extend from the side of the thickening head (23). The inlet and outlet of the fuel heater (2) are both located on the side of the thickening head (23).

7. The diesel heating system according to claim 2, characterized in that: It also includes a parking oil filter (11) and a fuel supply pump (12). The inlet of the parking oil filter (11) is connected to the suction pipe (3) through the fuel line, and the outlet of the parking oil filter (11) is connected to the inlet of the fuel supply pump (12) through the fuel line. The outlet of the fuel supply pump (12) is connected to the fuel inlet of the coolant heater (4) through the fuel line.

8. The diesel heating system according to claim 7, characterized in that: Heating wires (13) are provided on the fuel line from the oil suction pipe (3) to the vehicle oil filter (7) and on the fuel line from the oil suction pipe (3) to the engine (6); electric heating sleeves are provided on both the vehicle oil filter (7) and the parking oil filter (11).

9. The diesel heating system according to claim 8, characterized in that: It also includes a pipeline heating controller (14), a coolant heating controller (15) and a vehicle controller (16). The pipeline heating controller (14) and the coolant heating controller (15) are respectively connected to the vehicle controller (16) via signals; the heating wire (13) and the heating sleeve are respectively connected to the pipeline heating controller (14) via signals; the coolant heater (4), the circulation pump (5) and the oil supply pump (12) are respectively connected to the coolant heating controller (15) via signals.

10. The diesel heating system according to claim 1, characterized in that: The coolant outlet of the engine (6) is also connected to a three-way valve (9). The first outlet of the three-way valve (9) is connected to an air conditioning heater (10). The second outlet of the three-way valve (9) and the liquid outlet of the air conditioning heater (10) are connected to each other through the coolant pipeline and connected to the inlet of the circulation pump (5).

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