Fuel oil conversion device of diesel engine

Abstract

The utility model discloses a diesel engine fuel oil conversion device which comprises a valve block installed on the upper end face of a base plate, a first valve element and a second valve element are installed in the valve block in a rotating mode, valve element channels and a plurality of valve element holes communicated with the valve element channels are formed in the valve elements, and the two valve elements are respectively connected with an electric actuator. The delay switching of the oil return three-way oil way can be controlled, so that the fuel oil in the oil return pipe returns to the oil tank of the corresponding mark, and the fuel oil mixing is reduced. The heating assembly on the base plate is installed in the main oil tank when used, and therefore fuel oil in the main oil tank can be heated. The installation mode of the valve element on the valve block is simple, overhauling is convenient and fast, conversion of an oil return three-way oil way and an oil suction three-way oil way is achieved through the valve element channel and the valve element hole, and compared with a fuel oil conversion device based on a three-way ball valve in the prior art, the fuel oil conversion device is simpler and more reasonable in structural design, convenient to manufacture, lower in production cost and good in economic benefit.

Description

Technical Field

[0001] This utility model relates to the technical field of internal combustion engine fuel supply equipment, specifically to a diesel engine fuel conversion device. Background Technology

[0002] Diesel engines have advantages such as high torque and good fuel economy, and are widely used in some heavy-duty vehicles. Diesel engines obtain energy by burning diesel fuel and converting it into mechanical energy. However, diesel fuel contains paraffin, which easily solidifies at low temperatures, reducing its fluidity and preventing it from properly supplying fuel to the engine, thus causing the vehicle to fail to start.

[0003] To address the problem of diesel vehicles in northern regions being difficult to start in winter due to diesel fuel solidification, most existing diesel vehicles employ a main and auxiliary fuel tank design. The main fuel tank is generally used to fill with lower-priced, high-grade diesel fuel (such as 0# diesel), while the auxiliary fuel tank is used to fill with higher-priced, low-grade diesel fuel (such as -35# diesel). The low-grade diesel fuel can maintain its fluidity in low-temperature environments. During a cold start, the engine is started using the low-grade diesel fuel from the auxiliary fuel tank, and the heat generated by the engine operation continuously heats the high-grade diesel fuel in the main fuel tank. Once the high-grade diesel fuel in the main fuel tank reaches a suitable temperature, the system switches to supply fuel to the main fuel tank, thereby reducing fuel consumption costs.

[0004] To meet the fuel supply switching requirements of main and auxiliary fuel tanks in diesel vehicles, various fuel conversion devices with different structures have emerged on the market. However, most of the fuel conversion devices currently available are complex in structure, difficult to manufacture, and costly to produce, resulting in high market prices and poor economic efficiency. Therefore, this utility model proposes a diesel engine fuel conversion device to solve the aforementioned technical problems. Summary of the Invention

[0005] The purpose of this invention is to overcome the shortcomings of existing technologies and provide a diesel engine fuel conversion device. Two valve cores are each connected to an electric actuator, which can control the delayed switching of the return three-way fuel circuit, allowing fuel in the return pipe to return to the corresponding grade of fuel tank, reducing fuel mixing. Furthermore, the heating element on the base plate is installed inside the main fuel tank during use, thereby heating the fuel inside the main fuel tank. The valve cores are simply installed on the valve block, making maintenance convenient. The conversion between the return and suction three-way fuel circuits is achieved through the valve core channel and valve core hole. Compared to existing fuel conversion devices based on three-way ball valves, this invention has a simpler and more reasonable structural design, is easier to manufacture, has lower production costs, and offers better economic benefits. It can be directly installed at the bottom of the main fuel tank of diesel vehicles. During use, the base plate is fixedly installed at the opening of the fuel conversion device mounting hole at the bottom of the main fuel tank, with the valve block located outside the main fuel tank and the heating element located inside the main fuel tank. The installation method is simple and quick.

[0006] To achieve the above objectives, the technical solution of this utility model is to design a diesel engine fuel conversion device, including a valve block. The valve block is installed on the upper surface of a base plate. A valve core one and a valve core two are rotatably installed inside the valve block. The valve core one has a valve core channel one and several valve core holes communicating with the valve core channel one. The valve core two has a valve core channel two and several valve core holes communicating with the valve core channel two. The valve block is also provided with an engine oil return channel, an auxiliary oil tank oil return channel, an auxiliary oil tank suction channel, an engine oil inlet channel, a main oil tank oil return channel, and a main oil tank suction channel. The engine oil return channel, the auxiliary oil tank oil return channel, and the main oil tank oil return channel form a three-way oil return circuit through the valve core two. The auxiliary oil tank suction channel, the engine oil inlet channel, and the main oil tank suction channel form a three-way oil suction circuit through the valve core one. One end of the valve core one is connected to an electric actuator one. The electric actuator one drives the valve core one to rotate to control the rotation switching of the three-way oil suction circuit between a first state and a second state.

[0007] In the first state, the engine oil inlet passage is connected to the auxiliary oil tank suction passage through the valve core passage 1;

[0008] In the second state, the engine oil inlet channel is connected to the main oil tank suction channel through the valve core channel one;

[0009] One end of the valve core is connected to the electric actuator, and the electric actuator drives the valve core to rotate to control the rotation switching of the return oil three-way oil circuit between the third and fourth states.

[0010] In the third state, the engine oil return passage is connected to the auxiliary oil tank oil return passage through the valve core passage two;

[0011] In the fourth state, the engine oil return passage is connected to the main oil tank oil return passage through valve core passage two;

[0012] The lower end face of the substrate has a heating component for heating the fuel in the main oil tank. The substrate has an oil suction hole and an oil return hole that penetrate the plate. The oil suction hole is connected to the main oil tank suction channel on the valve block, and the oil return hole is connected to the main oil tank return channel on the valve block.

[0013] This utility model discloses a diesel engine fuel conversion device. Two valve cores are each connected to an electric actuator, controlling the delayed switching of the return three-way fuel circuit to ensure fuel in the return pipe returns to the corresponding grade of fuel tank, reducing fuel mixing. Furthermore, the heating element on the base plate is installed inside the main fuel tank during use, thereby heating the fuel inside the main fuel tank. The valve cores are simply installed on the valve block, facilitating maintenance. The conversion between the return and suction three-way fuel circuits is achieved through the valve core channel and valve core hole. Compared to existing fuel conversion devices based on three-way ball valves, this design is simpler and more reasonable, easier to manufacture, and has lower production costs, resulting in better economic benefits. It can be directly installed at the bottom of the main fuel tank of diesel vehicles. During use, the base plate is fixedly installed at the opening of the fuel conversion device mounting hole at the bottom of the main fuel tank, with the valve block located outside the main fuel tank and the heating element inside. The installation method is simple and quick.

[0014] A preferred technical solution is that the heating component consists of heating tubes with both ends respectively inserted and fixed inside through holes on the substrate. The valve block is also provided with a heating medium inlet channel and a heating medium return channel respectively connected to the two ends of the heating tubes. The heating tubes are integrated on the substrate and connected to the heating system circuit through the heating medium inlet channel and the heating medium return channel. The heating medium is generally water. The heating medium facilitates heat exchange between the heat source and the diesel fuel in the main fuel tank, thereby heating the main fuel tank. The heat source is generally the heat generated by the engine. Compared with electric heating, this significantly reduces battery power consumption and electrical load.

[0015] A further preferred technical solution is that the outer ends of the engine oil return channel, the auxiliary oil tank oil return channel, the auxiliary oil tank oil suction channel, the engine oil inlet channel, the end of the heating medium inlet channel away from the heating pipe, and the end of the heating medium return channel away from the heating pipe are all located on the front or rear side of the valve block. This valve port design is reasonable and facilitates the connection of each valve port on the fuel conversion device to its corresponding pipeline.

[0016] A further preferred technical solution includes a valve block having a cavity one opening to the left and a cavity two opening to the right. Valve core one is rotatably mounted inside cavity one, and valve core two is rotatably mounted inside cavity two. Electric actuator one and electric actuator two are respectively fixedly mounted on the left and right end faces of the valve block via connecting flanges. The two valve cores are respectively inserted into the corresponding cavities from the left and right ends of the valve block, and the electric actuators are fixedly mounted on the left and right ends of the valve block via connecting flanges. The valve body assembly formed by the two valve cores and the valve block has a simple and reasonable overall structure design, is easy to manufacture, and has good overall sealing performance. This simplifies the sealing structure of the valve body assembly, reduces assembly and processing difficulty, and helps improve the assembly and processing efficiency of the diesel engine fuel conversion device of this utility model.

[0017] A further preferred technical solution is that the engine oil return channel, auxiliary oil tank suction channel, heating medium return channel, and heating medium inlet channel are all "7"-shaped channel structures. The straight section of the heating medium inlet channel penetrates the rear side of the valve block, and a heating medium solenoid valve is installed at the rear end of the straight section. The upper ends of the vertical sections of the engine oil return channel and the auxiliary oil tank suction channel penetrate the top of the valve block, and sealing plugs are installed at the upper ends of the vertical sections of both the engine oil return channel and the auxiliary oil tank suction channel. The "7"-shaped channel structure of the engine oil return channel, auxiliary oil tank suction channel, heating medium return channel, and heating medium inlet channel facilitates drilling on the valve block. Furthermore, the upper ends of the vertical sections of the engine oil return channel and the auxiliary oil tank suction channel both penetrate the top of the valve block, further reducing the difficulty of drilling on the valve block. The heating medium solenoid valve can control the on / off state of the heating medium circuit inside the heating tube.

[0018] A preferred technical solution also includes a stepped groove with an opening extending rearward and upward in the middle of the rear side of the valve block. The bottom of the stepped groove and the substrate correspondingly have temperature sensor mounting holes for installing temperature sensing elements. When the temperature sensor is inserted and installed inside the temperature sensor mounting hole, its cable end can be installed inside the stepped groove, ensuring convenient installation of the temperature sensor.

[0019] A further preferred technical solution includes a waste discharge through-hole on the substrate, with a drain pipe connector extending to the rear side of the valve block installed inside the waste discharge through-hole. The rear edge of the stepped groove also has a groove, and the drain pipe connector is embedded inside the groove. When cleaning of the main oil tank is required, the cleaning waste liquid can be discharged through the waste discharge through-hole. The drain pipe connector improves the ease of connection between the waste discharge through-hole and the sewage pipe.

[0020] A further preferred technical solution is that the valve block and the base plate are provided with corresponding mounting holes, and the valve block and the base plate are fixedly connected together by screws passing through the corresponding mounting holes. The method of fixing the valve block on the base plate is simple, has good stability, and is easy to disassemble, facilitating later maintenance.

[0021] A further preferred technical solution is that an oil suction pipe and an oil return pipe extending downward are also fixedly connected to the substrate, and the upper end of the oil suction pipe is connected to the oil suction channel of the main oil tank, and the upper end of the oil return pipe is connected to the oil return channel of the main oil tank.

[0022] A further preferred technical solution includes a filter cartridge, wherein the open end of the filter cartridge is provided with a skirt extending outward, the base plate is a flange plate, and the lower end face of the base plate is provided with an annular groove 1 and an annular groove 2 coaxially from the inside to the outside, surrounding the outer periphery of the oil suction pipe, the oil return pipe and the heating pipe. The top surface of the annular groove 1 and the skirt on the filter cartridge are provided with a plurality of corresponding mounting holes 2 spaced apart circumferentially. The skirt on the filter cartridge is embedded in the annular groove 1 on the base plate, and the two are fixedly connected together by screws passing through the corresponding mounting holes 2. The filter cartridge protects the heating components, suction pipe, and return pipe, while also providing preliminary filtration of fuel entering the suction pipe from the main fuel tank, preventing impurities from entering and ensuring smooth fuel supply. The filter cartridge's simple mounting method on the lower end face of the base plate ensures convenient and efficient installation. When the diesel engine fuel conversion device is installed at the bottom of the main fuel tank, the opening of the fuel conversion device's mounting hole at the bottom of the main fuel tank is fitted into the annular groove on the lower end face of the base plate, which helps improve the installation efficiency of the diesel engine fuel conversion device at the bottom of the main fuel tank.

[0023] The advantages and beneficial effects of this utility model are as follows:

[0024] 1. This utility model discloses a diesel engine fuel conversion device, in which two valve cores are each connected to an electric actuator to control the delayed switching of the return three-way oil circuit, allowing the fuel in the return pipe to return to the corresponding grade of fuel tank, reducing fuel mixing. Furthermore, the heating element on the base plate is installed inside the main fuel tank during use, thereby heating the fuel inside the main fuel tank. The valve cores are simply installed on the valve block, making maintenance convenient. The conversion between the return three-way oil circuit and the suction three-way oil circuit is achieved through the valve core channel and valve core hole. Compared with existing fuel conversion devices based on three-way ball valves, this device has a simpler and more reasonable structural design, is easier to manufacture, has lower production costs, and better economic benefits. It can be directly installed at the bottom of the main fuel tank of diesel vehicles. During use, the base plate is fixedly installed at the opening end of the fuel conversion device mounting hole at the bottom of the main fuel tank, with the valve block located outside the main fuel tank and the heating element located inside the main fuel tank. The installation method is simple and quick.

[0025] 2. The heating element is integrated on the substrate and connected to the heating system circuit through the heating medium inlet channel and the heating medium return channel. The heating medium is generally water. The heating medium enables heat exchange between the heat source and the diesel fuel in the main fuel tank, thereby heating the main fuel tank. The heat source is generally the heat generated by the engine. Compared with electric heating, this significantly reduces the power consumption of the battery and reduces the electrical burden.

[0026] 3. The valve block has a cavity one opening to the left and a cavity two opening to the right. Valve core one is rotatably installed inside cavity one, and valve core two is rotatably installed inside cavity two. Electric actuator one and electric actuator two are respectively fixedly installed on the left and right end faces of the valve block via connecting flanges. The two valve cores are respectively inserted into the corresponding cavities from the left and right ends of the valve block, and the electric actuators are fixedly installed on the left and right ends of the valve block via connecting flanges. The valve body assembly formed by the two valve cores and the valve block has a simple and reasonable overall structure design, is easy to manufacture, and has good overall sealing performance. This simplifies the sealing structure of the valve body assembly, reduces assembly and processing difficulty, and helps improve the assembly and processing efficiency of the diesel engine fuel conversion device of this utility model.

[0027] 4. The engine oil return channel, auxiliary oil tank suction channel, heating medium return channel, and heating medium inlet channel are all designed with a "7" shaped channel structure, which makes it easy to drill holes in the valve block. Furthermore, the upper ends of the vertical sections of the engine oil return channel and the auxiliary oil tank suction channel both pass through the top of the valve block, further reducing the difficulty of drilling holes in the valve block. The heating medium solenoid valve can control the on / off of the heating medium circuit inside the heating tube.

[0028] 5. The substrate is provided with a waste discharge through-hole that penetrates the plate. A drain pipe connector extending to the rear side of the valve block is installed inside the waste discharge through-hole. The rear edge of the stepped groove is also provided with a groove, and the drain pipe connector is embedded in the groove. When it is necessary to clean the inside of the main oil tank, the cleaning waste liquid can be discharged through the waste discharge through-hole. The drain pipe connector improves the convenience of connecting the waste discharge through-hole with the sewage pipe.

[0029] 6. The filter cartridge protects the heating components, suction pipe, and return pipe, and also provides preliminary filtration of fuel entering the suction pipe from the main fuel tank, preventing impurities from entering the suction pipe and ensuring smooth fuel supply. The filter cartridge is simply fixed to the lower end face of the base plate, ensuring convenient and efficient installation. When the diesel engine fuel conversion device of this invention is installed at the bottom of the main fuel tank, the opening end of the fuel conversion device mounting hole at the bottom of the main fuel tank is correspondingly embedded in the annular groove II on the lower end face of the base plate, which helps to improve the installation accuracy and efficiency of the diesel engine fuel conversion device at the bottom of the main fuel tank. Attached Figure Description

[0030] Figure 1 This is a front-view perspective perspective view of a diesel engine fuel conversion device according to this utility model;

[0031] Figure 2 This is a rear-view perspective view of a diesel engine fuel conversion device according to this utility model;

[0032] Figure 3 This is a perspective view of a diesel engine fuel conversion device according to the present invention;

[0033] Figure 4 This is an exploded view of a diesel engine fuel conversion device according to this utility model;

[0034] Figure 5 This is a split view of the valve block, valve core one, and valve core two;

[0035] Figure 6 This is a three-dimensional view of the valve block from a rear-view perspective;

[0036] Figure 7 This is a three-dimensional view of the valve block from an upward perspective;

[0037] Figure 8 This is a longitudinal sectional view of the valve block at the position of the main oil tank suction channel axis;

[0038] Figure 9 This is a longitudinal sectional view of the valve block at the position of the heating medium inlet channel axis;

[0039] Figure 10 This is a diagram showing the assembly relationship of the heating element, oil suction pipe, and oil return pipe on the substrate.

[0040] Figure 11 This is a longitudinal sectional view of a diesel engine fuel conversion device according to the present invention.

[0041] In the diagram: 1. Valve block; 2. Base plate; 3. Electric actuator one; 4. Electric actuator two; 5. Suction pipe; 6. Return pipe; 7. Heating pipe; 8. Filter cartridge; 9. Connecting flange; 1-1. Valve core one; 1-1-1. Valve core channel one; 1-2. Valve core two; 1-2-1. Valve core channel two; 1-3. Valve core hole; 1-4. Valve core sealing ring; 1-5. Drain pipe joint; 1-6. Heating medium solenoid valve; 1-7. Pipe joint; 1-8. Sealing plug; 1a 1a) Engine oil return passage; 1b) Auxiliary oil tank oil return passage; 1c) Auxiliary oil tank suction passage; 1d) Engine oil inlet passage; 1e) Heating medium return passage; 1f) Heating medium inlet passage; 1g) Main oil tank oil return passage; 1h) Main oil tank suction passage; 1i) Groove; 1j) Mounting hole one; 1k) Step groove; 1m) Temperature sensing element mounting hole; 1n) Cavity one; 1p) Cavity two; 2-1) Annular groove one; 2-2) Annular groove two; 8-1) Skirt. Detailed Implementation

[0042] The specific embodiments of this utility model will be further described below with reference to the accompanying drawings and examples. The following examples are only used to more clearly illustrate the technical solution of this utility model and should not be construed as limiting the scope of protection of this utility model.

[0043] Example

[0044] like Figures 1-11 As shown, this utility model is a diesel engine fuel conversion device, including a valve block 1. The valve block 1 is mounted on the upper surface of a base plate 2. A valve core 1-1 and a valve core 1-2 are rotatably mounted inside the valve block 1. The valve core 1-1 has a valve core channel 1-1-1 and several valve core holes 1-3 communicating with the valve core channel 1-1-1. The valve core 1-2 has a valve core channel 1-2-1 and several valve core holes 1-3 communicating with the valve core channel 1-2-1. The valve block 1 is also provided with an engine oil return channel 1a, an auxiliary oil tank oil return channel 1b, and an auxiliary oil tank suction channel. The system includes oil channels 1c, 1d, 1g, and 1h. The oil return channels 1a, 1b, and 1g of the main oil tank are connected by valve core 1-2 to form a three-way oil return circuit. The oil suction channels 1c, 1d, and 1h of the main oil tank are connected by valve core 1-1 to form a three-way oil suction circuit. One end of valve core 1-1 is connected to electric actuator 3. The electric actuator 3 drives valve core 1-1 to rotate, thereby controlling the rotation switching of the three-way oil suction circuit between the first and second states.

[0045] In the first state, the engine oil inlet channel 1d is connected to the auxiliary oil tank suction channel 1c through the valve core channel 1-1-1;

[0046] In the second state, the engine oil inlet channel 1d is connected to the main oil tank suction channel 1h through the valve core channel 1-1-1;

[0047] One end of the valve core 1-2 is connected to the electric actuator 4. The electric actuator 4 drives the valve core 1-2 to rotate, thereby controlling the rotation switching of the return oil three-way oil circuit between the third and fourth states.

[0048] In the third state, the engine oil return passage 1a is connected to the auxiliary oil tank oil return passage 1b through the valve core passage 2 1-2-1;

[0049] In the fourth state, the engine oil return passage 1a is connected to the main oil tank oil return passage 1g through the valve core passage 2 1-2-1.

[0050] The lower end face of the substrate 2 has a heating component for heating the fuel in the main oil tank. The substrate 2 has an oil suction hole and an oil return hole that penetrate the plate body. The oil suction hole is connected to the main oil tank suction channel 1h on the valve block 1, and the oil return hole is connected to the main oil tank return channel 1g on the valve block 1.

[0051] Preferably, the heating component is a heating tube 7 with both ends respectively inserted and fixed inside the through hole on the substrate 2, and the valve block 1 is also provided with a heating medium inlet channel 1f and a heating medium return channel 1e respectively connected to the two ends of the heating tube 7.

[0052] More preferably, the outer end of the engine oil return channel 1a, the outer end of the auxiliary oil tank oil return channel 1b, the outer end of the auxiliary oil tank oil suction channel 1c, the outer end of the engine oil inlet channel 1d, the end of the heating medium inlet channel 1f away from the heating pipe 7, and the end of the heating medium return channel 1e away from the heating pipe 7 are all located on the front or rear side of the valve block 1. Specifically, the heating pipe 7 has a spiral structure.

[0053] More preferably, the valve block 1 has a cavity 1n opening to the left and a cavity 1p opening to the right. Valve core 1-1 is rotatably mounted inside cavity 1n, and valve core 1-2 is rotatably mounted inside cavity 1p. Electric actuators 3 and 4 are fixedly mounted on the left and right end faces of the valve block 1 via connecting flanges 9. Valve cores 1-1 and 1-2 are also provided with several valve core sealing rings 1-4 that seal with the corresponding cavities on the valve block 1 to ensure the sealing of each oil passage.

[0054] More preferably, the engine oil return channel 1a, the auxiliary oil tank suction channel 1c, the heating medium return channel 1e, and the heating medium inlet channel 1f are all "7" shaped channel structures. The straight section of the heating medium inlet channel 1f penetrates the rear side of the valve block 1, and a heating medium solenoid valve 1-6 is installed at the rear end of the straight section of the heating medium inlet channel 1f. The upper end of the vertical section of the engine oil return channel 1a and the upper end of the vertical section of the auxiliary oil tank suction channel 1c penetrate the top of the valve block 1, and a sealing plug 1-8 is installed at the upper end of the vertical section of the engine oil return channel 1a and the upper end of the vertical section of the auxiliary oil tank suction channel 1c.

[0055] Preferably, the valve block 1 has a stepped groove 1k with an opening extending rearward and upward in the middle of its rear side. A temperature sensing element mounting hole 1m is correspondingly provided at the bottom of the stepped groove 1k and on the substrate 2 for mounting a temperature sensing element. Specifically, a temperature sensor extending to the lower end face of the substrate 2 is installed inside the temperature sensing element mounting hole 1m.

[0056] More preferably, the substrate 2 is provided with a waste discharge through hole that penetrates the plate body, and a drain pipe joint 1-5 extending to the rear side of the valve block 1 is installed inside the waste discharge through hole. The rear edge of the stepped groove 1k is also provided with a groove 1i, and the drain pipe joint 1-5 is embedded in the groove 1i.

[0057] More preferably, the valve block 1 and the base plate 2 are provided with corresponding mounting holes 1j, and the valve block 1 and the base plate 2 are fixedly connected together by screws passing through the corresponding mounting holes 1j.

[0058] More preferably, an oil suction pipe 5 and an oil return pipe 6 extending downwards are also fixedly connected to the substrate 2, with the upper end of the oil suction pipe 5 connected to the main oil tank oil suction channel 1h and the upper end of the oil return pipe 6 connected to the main oil tank oil return channel 1g. Specifically, the oil suction pipe 5 and the oil return pipe 6 extend into the internal cavity of the heating pipe 7.

[0059] More preferably, it also includes a filter cylinder 8, the open end of which is provided with a skirt 8-1 extending outwards. The base plate 2 is a flange plate. The lower end face of the base plate 2 is coaxially provided with annular groove 1 2-1 and annular groove 2-2 surrounding the outer periphery of the oil suction pipe 5, the oil return pipe 6 and the heating pipe 7. The top surface of the annular groove 1 2-1 and the skirt 8-1 on the filter cylinder 8 are provided with a plurality of corresponding mounting holes 2 at intervals around each other. The skirt 8-1 on the filter cylinder 8 is embedded in the annular groove 1 2-1 on the base plate 2, and the two are fixedly connected together by screws passing through the corresponding mounting holes 2.

[0060] In addition, pipe fittings 1-7 extending to the outside of valve block 1 are installed on the open ends of the six oil return channels 1a, 1b, 1c, 1d, 1e, and 1f of the engine oil return channel, to facilitate the connection between the diesel engine fuel conversion device of this utility model and the external oil pipe.

[0061] Utility model patent No. 202421239330.1 discloses a fuel supply switching device with a delay function, which shows the structure of a first electric actuator and a second electric actuator. The electric actuator 3 and electric actuator 4 involved in the diesel engine fuel switching device of this utility model have the same structure, and their structures are identical to those of the first or second electric actuator given in utility model patent No. 202421239330.1. Therefore, the structures of electric actuator 3 and electric actuator 4 will not be described in detail here.

[0062] The working principle of a diesel engine fuel conversion device according to this utility model is as follows:

[0063] In use, the diesel engine fuel conversion device is inverted and installed inside the fuel conversion device mounting hole at the bottom of the main fuel tank. The base plate 2 is then fixedly connected to the bottom of the main fuel tank using screws. The suction pipe 5, return pipe 6, and heating pipe 7 are located inside the main fuel tank, while the valve block 1 is located outside. The suction tee is in its second state, and the return tee is in its fourth state. Specifically, the engine fuel inlet channel 1d is connected to the main fuel tank suction channel 1h via valve core channel 1-1-1, and the engine fuel return channel 1a is connected to the main fuel tank return channel 1g via valve core channel 1-2-1. Taking an example where the main fuel tank contains 0# diesel and the auxiliary fuel tank contains -35# diesel; when the ambient temperature... At lower temperatures, such as -25℃ in northern winters, activating the fuel heating button in the main fuel tank via the cab control system first sends a rotation command to electric actuator 3. Electric actuator 3 then drives valve core 1-1 from its second state to its first state, meaning the engine fuel inlet channel 1d connects to the auxiliary fuel tank suction channel 1c via valve core channel 1-1-1, supplying fuel to the engine from the auxiliary fuel tank. After a delay (e.g., 60-100 seconds), the control system sends a rotation command to electric actuator 4, which then drives valve core 1-2 from its fourth state to its third state, meaning the engine fuel return channel 1a connects to the auxiliary fuel tank suction channel 1c via valve core channel 1-2-1. The fuel return channel 1b is connected, and through this, the electric actuator 4 drives the valve core 1-2 to switch after a delay, so that the small amount of residual 0# diesel fuel in the fuel line flows back to the main fuel tank as completely as possible. During this process, the heat transfer medium (usually water inside the engine) continuously flows in the heating pipe 7 to heat the fuel inside the main fuel tank. The temperature sensor will transmit the detected fuel temperature signal inside the main fuel tank to the control system in real time. When the fuel temperature inside the main fuel tank reaches the set temperature value, the control system first sends a rotation command to the electric actuator 3, and then the electric actuator 3 drives the valve core 1-1 to change from the first state to the second state, that is, the engine fuel inlet channel 1d passes through the valve core channel 1-1-1. The main oil tank suction channel 1h is connected to the main oil tank, which supplies oil to the engine. After a delay (e.g., 40-60 seconds), the control system sends a rotation command to the electric actuator 4. The electric actuator 4 then drives the valve core 1-2 to change from the third state to the fourth state. That is, the engine return oil channel 1a is connected to the main oil tank return oil channel 1g through the valve core channel 1-2-1. Through this delayed switching of the electric actuator 4 driving the valve core 1-2, most of the small amount of -35# diesel fuel remaining in the oil circuit flows back to the auxiliary oil tank, which helps to save the cost of -35# diesel fuel in the auxiliary oil tank. This ensures that when the engine is stopped, the suction three-way oil circuit is in the second state and the return three-way oil circuit is in the fourth state.

[0064] This utility model discloses a diesel engine fuel conversion device. Two valve cores are each connected to an electric actuator, controlling the delayed switching of the return three-way fuel circuit to ensure fuel in the return pipe returns to the corresponding grade of fuel tank, reducing fuel mixing. Furthermore, the heating element on the base plate is installed inside the main fuel tank during use, thereby heating the fuel inside the main fuel tank. The valve cores are simply installed on the valve block, facilitating maintenance. The conversion between the return and suction three-way fuel circuits is achieved through the valve core channel and valve core hole. Compared to existing fuel conversion devices based on three-way ball valves, this design is simpler and more reasonable, easier to manufacture, and has lower production costs, resulting in better economic benefits. It can be directly installed at the bottom of the main fuel tank of diesel vehicles. During use, the base plate is fixedly installed at the opening of the fuel conversion device mounting hole at the bottom of the main fuel tank, with the valve block located outside the main fuel tank and the heating element inside. The installation method is simple and quick.

[0065] The above description is only a preferred embodiment of the present utility model. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the technical principles of the present utility model, and these improvements and modifications should also be considered within the protection scope of the present utility model.

Claims

1. A diesel engine fuel conversion device, characterized in that, The system includes a valve block (1) mounted on the upper surface of a base plate (2). A valve core (1-1) and a valve core (1-2) are rotatably mounted inside the valve block (1). The valve core (1-1) has a valve core channel (1-1-1) and several valve core holes (1-3) connecting to the valve core channel (1-1-1). The valve core (1-2) has a valve core channel (1-2-1) and several valve core holes (1-3) connecting to the valve core channel (1-2-1). The valve block (1) also includes an engine oil return channel (1a), a secondary oil tank oil return channel (1b), a secondary oil tank oil suction channel (1c), and an engine oil inlet channel. The main oil tank return channel (1d), the main oil tank return channel (1g), and the main oil tank suction channel (1h) are connected by a valve core (1-2). The engine return channel (1a), the auxiliary oil tank return channel (1b), and the main oil tank return channel (1g) are connected by a valve core (1-1) to form a three-way oil return circuit. The auxiliary oil tank suction channel (1c), the engine inlet channel (1d), and the main oil tank suction channel (1h) are connected by a valve core (1-1) to form a three-way oil suction circuit. One end of the valve core (1-1) is connected to an electric actuator (3). The electric actuator (3) drives the valve core (1-1) to rotate to control the rotation switching of the three-way oil suction circuit between the first state and the second state. In the first state, the engine oil inlet passage (1d) is connected to the auxiliary oil tank suction passage (1c) through the valve core passage (1-1-1); In the second state, the engine oil inlet passage (1d) is connected to the main oil tank suction passage (1h) through the valve core passage (1-1-1); One end of the valve core 2 (1-2) is connected to the electric actuator 2 (4). The electric actuator 2 (4) drives the valve core 2 (1-2) to rotate, thereby controlling the rotation switching of the return oil three-way oil circuit between the third and fourth states. In the third state, the engine oil return passage (1a) is connected to the auxiliary oil tank oil return passage (1b) through the valve core passage two (1-2-1); In the fourth state, the engine oil return passage (1a) is connected to the main oil tank oil return passage (1g) through the valve core passage two (1-2-1); The lower end face of the substrate (2) has a heating component for heating the fuel in the main oil tank. The substrate (2) has an oil suction hole and an oil return hole that penetrate the plate body. The oil suction hole is connected to the main oil tank oil suction channel (1h) on the valve block (1), and the oil return hole is connected to the main oil tank oil return channel (1g) on ​​the valve block (1).

2. The diesel engine fuel conversion device as described in claim 1, characterized in that, The heating component is a heating tube (7) with both ends respectively inserted and fixed inside the through hole on the substrate (2). The valve block (1) is also provided with a heating medium inlet channel (1f) and a heating medium return channel (1e) connected to both ends of the heating tube (7).

3. The diesel engine fuel conversion device as described in claim 2, characterized in that, The outer end of the engine oil return channel (1a), the outer end of the auxiliary oil tank oil return channel (1b), the outer end of the auxiliary oil tank oil suction channel (1c), the outer end of the engine oil inlet channel (1d), the end of the heating medium inlet channel (1f) away from the heating pipe (7), and the end of the heating medium return channel (1e) away from the heating pipe (7) are all located on the front or rear side of the valve block (1).

4. The diesel engine fuel conversion device as described in claim 3, characterized in that, The valve block (1) has a cavity 1 (1n) with an opening facing the left and a cavity 2 (1p) with an opening facing the right. The valve core 1 (1-1) is rotatably installed inside the cavity 1 (1n), and the valve core 2 (1-2) is rotatably installed inside the cavity 2 (1p). The electric actuator 1 (3) and the electric actuator 2 (4) are respectively fixedly installed on the left and right end faces of the valve block (1) through connecting flanges (9).

5. The diesel engine fuel conversion device as described in claim 4, characterized in that, The engine oil return channel (1a), auxiliary oil tank suction channel (1c), heating medium return channel (1e), and heating medium inlet channel (1f) are all "7" shaped channel structures. The straight section of the heating medium inlet channel (1f) penetrates the rear side of the valve block (1), and a heating medium solenoid valve (1-6) is installed at the rear end of the straight section of the heating medium inlet channel (1f). The upper end of the vertical section of the engine oil return channel (1a) and the upper end of the vertical section of the auxiliary oil tank suction channel (1c) penetrate the top of the valve block (1), and a sealing plug (1-8) is installed at the upper end of the vertical section of the engine oil return channel (1a) and the upper end of the vertical section of the auxiliary oil tank suction channel (1c).

6. The diesel engine fuel conversion device as described in claim 1, characterized in that, The valve block (1) has a stepped groove (1k) with an opening extending to the rear and upward in the middle of the rear side. The bottom of the stepped groove (1k) and the base plate (2) are respectively provided with temperature measuring element mounting holes (1m) for installing temperature measuring elements.

7. The diesel engine fuel conversion device as described in claim 6, characterized in that, The substrate (2) is provided with a waste discharge through hole that penetrates the plate body. A drain pipe joint (1-5) extending to the rear side of the valve block (1) is installed inside the waste discharge through hole. The rear edge of the stepped groove (1k) is also provided with a groove (1i). The drain pipe joint (1-5) is embedded in the groove (1i).

8. The diesel engine fuel conversion device according to any one of claims 1 to 7, characterized in that, The valve block (1) and the base plate (2) are provided with corresponding mounting holes (1j), and the valve block (1) and the base plate (2) are fixedly connected together by screws that pass through the corresponding mounting holes (1j).

9. The diesel engine fuel conversion device as described in claim 8, characterized in that, The substrate (2) is also provided with an oil suction pipe (5) extending downward and an oil return pipe (6), with the upper end of the oil suction pipe (5) connected to the main oil tank oil suction channel (1h) and the upper end of the oil return pipe (6) connected to the main oil tank oil return channel (1g).

10. The diesel engine fuel conversion device as described in claim 9, characterized in that, It also includes a filter cylinder (8), the filter cylinder (8) has a skirt (8-1) extending outward at the open end, the base plate (2) is a flange plate, and the lower end face of the base plate (2) has an annular groove one (2-1) and an annular groove two (2-2) coaxially arranged from the inside to the outside around the oil suction pipe (5), the oil return pipe (6) and the heating pipe (7). The top surface of the annular groove one (2-1) and the skirt (8-1) on the filter cylinder (8) are provided with a number of corresponding mounting holes two circumferentially spaced. The skirt (8-1) on the filter cylinder (8) is embedded in the annular groove one (2-1) on the base plate (2), and the two are fixedly connected together by screws passing through the corresponding mounting holes two.

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