Single-drive delay fuel oil supply conversion device

Abstract

The utility model discloses a single-drive delay fuel oil supply conversion device, and belongs to the field of fuel oil supply of internal combustion engines. The three-way oil suction valve comprises a change-over valve and an electric actuator, the change-over valve comprises a valve body and a valve element, an engine oil suction port, a main oil tank oil suction port, an auxiliary oil tank oil suction port, an engine oil return port, a main oil tank oil return port and an auxiliary oil tank oil return port are formed in the valve body, and the three oil suction ports in the valve body form an oil suction three-way oil way through an oil suction valve element section of the valve element. Three oil return ports on the valve body form an oil return three-way oil way through an oil return valve core section of the valve core; the oil suction three-way oil way and the oil return three-way oil way have three oil way states of'primary suction and primary return ', 'secondary suction and primary return' and'secondary suction and secondary return 'along with the change of the rotating angle of the valve element. By means of the design of the valve element, the delayed oil return function of the main oil tank and the auxiliary oil tank can be achieved through one electric actuator, manufacturing cost is reduced, a control system is simplified, the fault rate can be reduced, and working stability is improved.

Description

Technical Field

[0001] This utility model relates to a fuel supply device for an internal combustion engine, and more specifically, to a single-drive delayed fuel supply switching 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 (such as 0# diesel), while the auxiliary fuel tank is used to fill with higher-priced, low-grade diesel (such as -35# diesel). The low-grade diesel can maintain its fluidity in low-temperature environments. During a cold start, the engine is started using the low-grade diesel from the auxiliary fuel tank, and the heat generated by the engine continuously heats the high-grade diesel in the main fuel tank. Once the high-grade diesel 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] Currently, fuel switching between the main and auxiliary fuel tanks is primarily achieved through a switching valve, with the engine's fuel intake and return both controlled via a three-way valve. To facilitate this switching operation, the use of electric switching valves instead of manual ones is becoming increasingly common. The advantage of electric switching valves is that their operation can be controlled electronically. When the two three-way valves are controlled independently, they can more accurately achieve delayed return fuel switching, ensuring that fuel in the return line flows back to the corresponding fuel tank, reducing fuel mixing. Chinese Patent Publication No. CN222296394U discloses a "Fuel Supply Switching Device with Delay Function," published on January 3, 2025. This device includes a switching valve, a first electric actuator, and a second electric actuator. The switching valve comprises a valve body, a first valve core, and a second valve core. The valve core has a valve core channel and several valve core holes connecting to the channel. Each valve core is connected to an electric actuator, allowing for delayed switching of the return oil three-way valve, ensuring that fuel in the return oil pipe returns to the corresponding grade of fuel in the tank, reducing fuel mixing. However, the need for two electric actuators (motors) increases manufacturing costs and requires a control system to ensure accurate coordination between the two actuators. This makes the control system complex and significantly increases the probability of failure for both actuators. Summary of the Invention

[0005] 1. Technical problem to be solved by the utility model

[0006] The purpose of this utility model is to overcome the shortcomings of the existing technology and provide a single-drive delayed fuel supply switching device. By adopting the technical solution of this utility model, the valve core of the switching valve is designed so that the valve core has different oil circuit states at different rotation angles. The delayed return function of the main and auxiliary fuel tanks can be realized by using an electric actuator, which reduces manufacturing costs, simplifies the control system, reduces failure rate, and improves working stability.

[0007] 2. Technical Solution

[0008] To achieve the above objectives, the technical solution provided by this utility model is as follows:

[0009] This utility model discloses a single-drive delayed fuel supply switching device, comprising a switching valve and an electric actuator. The switching valve includes a valve body and a valve core rotatable within the valve body. The electric actuator is connected to one end of the valve core and is used to drive the valve core to rotate within the valve body to control the switching of the fuel supply channel. The valve core has a suction valve core section and a return valve core section. The valve body is provided with an engine fuel inlet, a main fuel tank fuel inlet, an auxiliary fuel tank fuel inlet, an engine return port, a main fuel tank return port, and an auxiliary fuel tank return port. The engine fuel inlet, the main fuel tank fuel inlet, and the auxiliary fuel tank fuel inlet form a three-way suction oil circuit through the suction valve core section of the valve core. The engine return port, the main fuel tank return port, and the auxiliary fuel tank return port form a three-way return oil circuit through the return valve core section of the valve core. The suction three-way oil circuit and the return three-way oil circuit have the following three switchable oil circuit states as the rotation angle of the valve core changes:

[0010] The first oil circuit state is as follows: the engine oil suction port is connected to the main oil tank oil suction port through the oil suction valve core section, and the engine oil return port is connected to the main oil tank oil return port through the oil return valve core section.

[0011] The second oil circuit is as follows: the engine oil inlet is connected to the auxiliary oil tank oil inlet through the oil inlet valve core section, and the engine oil return port is connected to the main oil tank oil return port through the oil return valve core section.

[0012] The third oil circuit is configured such that the engine oil inlet is connected to the auxiliary oil tank oil inlet via the oil inlet valve core section, and the engine oil return port is connected to the auxiliary oil tank oil return port via the oil return valve core section.

[0013] Furthermore, the electric actuator has a rotational sequence that drives the valve core to switch between the first oil circuit state, the second oil circuit state, and the third oil circuit state.

[0014] Furthermore, the suction valve core section and the return valve core section are separated by an intermediate sealing ring located in the middle of the valve core;

[0015] The oil suction valve core section has an engine oil suction valve hole section, a main oil tank oil suction valve hole section, and an auxiliary oil tank oil suction valve hole section arranged axially. The engine oil suction port is opposite to the engine oil suction valve hole section, the main oil tank oil suction port is opposite to the main oil tank oil suction valve hole section, and the auxiliary oil tank oil suction port is opposite to the auxiliary oil tank oil suction valve hole section. The engine oil suction valve hole section, the main oil tank oil suction valve hole section, and the auxiliary oil tank oil suction valve hole section are respectively provided with valve holes that are connected through the first valve core channel inside the valve core.

[0016] The return valve core section has an axially distributed engine return valve hole section, main oil tank return valve hole section, and auxiliary oil tank return valve hole section. The engine return port is opposite to the engine return valve hole section, the main oil tank return port is opposite to the main oil tank return valve hole section, and the auxiliary oil tank return port is opposite to the auxiliary oil tank return valve hole section. The engine return valve hole section, the main oil tank return valve hole section, and the auxiliary oil tank return valve hole section are each provided with a valve hole that is connected by a second valve core channel inside the valve core.

[0017] Furthermore, the valve core has a switching rotation angle of 120° between the first oil circuit state, the second oil circuit state, and the third oil circuit state.

[0018] Furthermore, the engine oil suction valve orifice section and the engine oil return valve orifice section each have three valve holes evenly distributed at 120° intervals; the main oil tank oil suction valve orifice section and the auxiliary oil tank oil return valve orifice section each have one valve hole and two oil port sealing rings evenly distributed at 120° intervals; the auxiliary oil tank oil suction valve orifice section and the main oil tank oil return valve orifice section each have two valve holes and one oil port sealing ring evenly distributed at 120° intervals.

[0019] Furthermore, the intermediate sealing ring is installed in the sealing ring mounting groove in the middle of the valve core, and the middle of the oil suction valve core section and the oil return valve core section are provided with support ring grooves, and the support ring grooves are provided with support rings that cooperate with the valve body; the outer walls of the main oil tank suction valve hole section, the auxiliary oil tank suction valve hole section, the main oil tank return valve hole section and the auxiliary oil tank return valve hole section are all provided with anti-slip textures, and the corresponding oil port sealing rings are located on the sealing sleeves sleeved on the outside of each anti-slip texture.

[0020] Furthermore, the valve core is provided with a switching pointer at the end away from the electric actuator, and the valve body is provided with a status indicator that cooperates with the switching pointer.

[0021] Furthermore, the end of the valve core furthest from the electric actuator is sealed by a blind, and the switching pointer is fixed to the blind by a locking bolt.

[0022] Furthermore, it also includes a main oil tank heating sensor, which includes a base and an oil suction pipe, an oil return pipe, and a heating pipe installed at the bottom of the base. The valve body is fixedly installed on one side of the base. The main oil tank suction port is connected to the pipe opening of the oil suction pipe, and the main oil tank return port is connected to the pipe opening of the oil return pipe. The base is also provided with a heating medium inlet and a heating medium return port, which are respectively connected to both ends of the heating pipe.

[0023] Furthermore, the engine oil inlet, auxiliary oil tank oil inlet, engine oil return port, and auxiliary oil tank oil return port are arranged side by side on the same side of the valve body, while the main oil tank oil inlet and main oil tank oil return port are arranged side by side on the other side of the valve body.

[0024] 3. Beneficial effects

[0025] Compared with existing known technologies, the technical solution provided by this utility model has the following beneficial effects:

[0026] (1) A single-drive delayed fuel supply switching device of the present invention includes a switching valve and an electric actuator. The switching valve includes a valve body and a valve core that can rotate within the valve body. The valve body is provided with an engine fuel inlet, a main fuel tank fuel inlet, an auxiliary fuel tank fuel inlet, an engine fuel return port, a main fuel tank fuel return port, and an auxiliary fuel tank fuel return port. The engine fuel inlet, the main fuel tank fuel inlet, and the auxiliary fuel tank fuel inlet form a three-way fuel inlet through the fuel inlet valve core section of the valve core. The engine fuel return port, the main fuel tank fuel return port, and the auxiliary fuel tank fuel return port are connected to the valve core. The return oil circuit is formed by the return oil valve core section of the valve core; the suction oil circuit and the return oil circuit have three switchable oil circuit states, namely "main suction and main return", "secondary suction and main return" and "secondary suction and secondary return", depending on the rotation angle of the valve core. Through the valve core design of the switching valve, the valve core has different oil circuit states at different rotation angles. The delayed oil return function of the main and auxiliary oil tanks can be realized by using an electric actuator, which reduces manufacturing costs, simplifies the control system, reduces the failure rate, and improves the stability of operation.

[0027] (2) The present invention provides a single-drive delayed fuel supply switching device, wherein the electric actuator has a rotation sequence that drives the valve core to switch through the first oil circuit state, the second oil circuit state and the third oil circuit state in sequence. By controlling the time when the valve core is in the second oil circuit state (secondary suction and main return), the return oil delay switching time can be controlled, making the control simpler and more convenient.

[0028] (3) The present invention provides a single-drive delayed fuel supply conversion device, wherein the suction valve core section and the return valve core section are separated by an intermediate sealing ring located in the middle of the valve core. Different valve core sections on the suction valve core section and the return valve core section have different numbers and positions of valve holes. Different oil circuit states can be achieved by using one valve core. The structure is simple, easy to manufacture, and has low manufacturing cost.

[0029] (4) The single-drive delayed fuel supply switching device of this utility model has a valve core with a switching rotation angle of 120° between the first oil circuit state, the second oil circuit state and the third oil circuit state, which makes the processing of the valve hole simpler and more convenient, and the oil circuit switching convenient and accurate.

[0030] (5) In a single-drive delayed fuel supply switching device of the present invention, the intermediate sealing ring is installed in the sealing ring mounting groove in the middle of the valve core. The middle of the suction valve core section and the return valve core section are provided with support ring slots. The support ring slots are provided with support rings that cooperate with the valve body, so that the suction three-way oil passage and the return three-way oil passage are reliably sealed and the valve core rotates smoothly and stably. The outer walls of the main oil tank suction valve hole section, the auxiliary oil tank suction valve hole section, the main oil tank return valve hole section and the auxiliary oil tank return valve hole section are provided with anti-slip textures. The corresponding oil port sealing rings are located on the sealing sleeves sleeved on the outside of each anti-slip texture, which can prevent the sealing sleeves from moving and ensure the precision and working reliability of the switching valve.

[0031] (6) The single-drive delayed fuel supply switching device of this utility model has a switching pointer at the end of the valve core away from the electric actuator, and a status indicator on the valve body that cooperates with the switching pointer, so that the position of the valve core can be observed intuitively, which improves the visibility and accuracy of oil circuit switching.

[0032] (7) A single-drive delayed fuel supply switching device of this utility model has a valve core that is sealed by a blind end away from the electric actuator, and the switching pointer is fixed to the blind end by a locking bolt. The structure is simple and easy to manufacture and assemble.

[0033] (8) The present invention provides a single-drive delayed fuel supply switching device, which also includes a main fuel tank heating sensor. The switching valve is integrated on the main fuel tank heating sensor and can be directly installed on the main fuel tank. The structure is simple and compact, with high integration and convenient installation. Attached Figure Description

[0034] Figure 1 This is a schematic diagram of the overall structure of a single-drive delayed fuel supply switching device according to the present invention;

[0035] Figure 2 This is a partial structural schematic diagram of a single-drive delayed fuel supply switching device according to the present invention;

[0036] Figure 3 This is a schematic diagram showing the disassembled structure of the switching valve and the main fuel tank heating sensor in a single-drive delayed fuel supply switching device of this utility model.

[0037] Figure 4 This is a schematic diagram of the overall structure of the switching valve in a single-drive delayed fuel supply switching device according to this utility model;

[0038] Figure 5 This is a schematic diagram showing the disassembled structure of the switching valve in a single-drive delayed fuel supply switching device according to the present invention.

[0039] Figure 6 This is a schematic diagram of the switching pointer in a single-drive delayed fuel supply switching device according to the present invention;

[0040] Figure 7 This is a schematic diagram of the assembly structure of the valve core in a single-drive delayed fuel supply switching device according to the present invention;

[0041] Figure 8 This is a schematic diagram of the valve core rod structure in a single-drive delayed fuel supply switching device of this utility model;

[0042] Figure 9 This is a schematic diagram of the single-drive delayed fuel supply switching device of this utility model in the main fuel tank suction and return states.

[0043] Figure 10 This is a schematic diagram of the single-drive delayed fuel supply switching device of this utility model in the state of fuel suction from the auxiliary fuel tank and fuel return from the main fuel tank.

[0044] Figure 11 This is a schematic diagram of the single-drive delayed fuel supply switching device of this utility model in the auxiliary fuel tank suction and return states.

[0045] Explanation of the labels in the diagram:

[0046] 1. Switching valve; 1a. Engine oil suction port; 1b. Main fuel tank oil suction port; 1c. Auxiliary fuel tank oil suction port; 1d. Engine oil return port; 1e. Main fuel tank oil return port; 1f. Auxiliary fuel tank oil return port; 1-1. Valve body; 1-1a. Status indicator; 1-2. Valve core; 1-2Ⅰ. Oil suction valve core section; 1-2Ⅱ. Oil return valve core section; 1-2a. Engine oil suction valve orifice section; 1-2b. Main fuel tank oil suction valve orifice section; 1-2c. Auxiliary fuel tank oil suction valve orifice section; 1-2d. Engine oil return valve orifice section; 1-2e. Main fuel tank oil return valve orifice section; 1-2f. 1. Auxiliary oil tank return valve orifice section; 1-2-1. Sealing ring mounting groove; 1-2-2. Support ring retaining groove; 1-2-3. Anti-slip texture; 1-2-4. First valve core channel; 1-2-5. Second valve core channel; 1-3. Intermediate sealing ring; 1-4. Support ring; 1-5. End cap; 1-6. Locking bolt; 1-7. Snap ring; 2. Electric actuator; 3. Connecting flange; 4. Base; 5. Suction pipe; 6. Return pipe; 7. Heating pipe; 7a. Heating medium inlet; 7b. Heating medium return port; 8. Filter; 9. Conversion pointer. Detailed Implementation

[0047] To further understand the content of this utility model, a detailed description of this utility model will be provided in conjunction with the accompanying drawings and embodiments.

[0048] [Example]

[0049] Combination Figures 1 to 5 As shown, a single-drive delayed fuel supply switching device in this embodiment includes a switching valve 1 and an electric actuator 2. The switching valve 1 includes a valve body 1-1 and a valve core 1-2 that can rotate within the valve body 1-1. The electric actuator 2 is connected to one end of the valve core 1-2 and is used to drive the valve core 1-2 to rotate within the valve body 1-1 to control the switching of the fuel supply channel. The valve core 1-2 has an oil suction valve core section 1-2Ⅰ and an oil return valve core section 1-2Ⅱ, which are connected as one unit. The valve body 1-1 is provided with an engine oil suction port 1a, a main oil tank oil suction port 1b, an auxiliary oil tank oil suction port 1c, an engine oil return port 1d, a main oil tank oil return port 1e, and an auxiliary oil tank oil return port 1f. The engine oil suction port 1a is used to connect to the engine oil inlet, the engine oil return port 1d is used to connect to the engine oil outlet, the main oil tank oil suction port 1b and the main oil tank oil return port 1e are respectively connected to the main oil tank, and the auxiliary oil tank oil suction port 1c and the auxiliary oil tank oil return port 1f are respectively connected to the auxiliary oil tank. The engine oil suction port 1a, the main fuel tank suction port 1b, and the auxiliary fuel tank suction port 1c form a three-way oil suction circuit via the suction valve core section 1-2Ⅰ of valve core 1-2, used to switch the connection between engine oil suction port 1a and either main fuel tank suction port 1b or auxiliary fuel tank suction port 1c. The engine oil return port 1d, the main fuel tank return port 1e, and the auxiliary fuel tank return port 1f form a three-way oil return circuit via the return valve core section 1-2Ⅱ of valve core 1-2, used to switch the connection between engine oil return port 1d and either main fuel tank return port 1e or auxiliary fuel tank return port 1f. The suction and return three-way oil circuits have three switchable oil circuit states depending on the rotation angle of valve core 1-2:

[0050] The first oil circuit configuration is as follows: engine oil inlet 1a is connected to main oil tank oil inlet 1b via oil inlet valve core section 1-2Ⅰ; engine oil return port 1d is connected to main oil tank oil return port 1e via oil return valve core section 1-2Ⅱ; (Refer to...) Figure 9 As shown, at this time, the main oil tank supplies oil to the engine, which can be called "main suction and main return". That is, the engine draws oil from the main oil tank and returns it to the main oil tank.

[0051] The second oil circuit is configured as follows: engine oil inlet 1a is connected to auxiliary oil tank oil inlet 1c via oil inlet valve core section 1-2Ⅰ; engine oil return port 1d is connected to main oil tank oil return port 1e via oil return valve core section 1-2Ⅱ; (Refer to...) Figure 10As shown, at this time, the engine switches to drawing fuel from the auxiliary fuel tank while still returning fuel to the main fuel tank. This state is an intermediate state of delayed switching, which allows the fuel in the main fuel tank in the pipeline to continue flowing back to the main fuel tank, preventing fuel from the auxiliary fuel tank from mixing with the main fuel tank. This can be called "auxiliary draw, main return".

[0052] The third oil circuit is configured as follows: engine oil inlet 1a is connected to auxiliary oil tank oil inlet 1c via oil inlet valve core section 1-2Ⅰ; engine oil return port 1d is connected to auxiliary oil tank oil return port 1f via oil return valve core section 1-2Ⅱ; (Refer to...) Figure 11 As shown, the engine is supplied with fuel from the auxiliary fuel tank at this time, which can be called "auxiliary suction and auxiliary return". That is, the engine draws fuel from the auxiliary fuel tank and returns it to the auxiliary fuel tank.

[0053] In other words, the switching valve 1 in this embodiment uses a single valve core 1-2. The on / off relationship of the valve core 1-2 at three different positions enables the switching between the engine and the main and auxiliary fuel tanks. An intermediate transition state is designed for switching between the main and auxiliary fuel tanks. This state allows for a delayed switching of the fuel return line during fuel switching, thereby reducing fuel mixing between the main and auxiliary tanks. Through the valve core design of the switching valve 1, the valve core 1-2 has different oil circuit states at different rotation angles. A single electric actuator 2 can achieve the delayed fuel return function between the main and auxiliary fuel tanks, reducing manufacturing costs, simplifying the control system, lowering the failure rate, and improving operational stability.

[0054] In this embodiment, the electric actuator 2 has a rotational sequence that drives the valve core 1-2 to switch between the first oil circuit state, the second oil circuit state, and the third oil circuit state. That is, the single-drive delayed fuel supply switching device switches from the "main intake / main return" state to the "auxiliary intake / auxiliary return" state, passing through the intermediate state of "auxiliary intake / main return," thus achieving a delayed switching between the main and auxiliary fuel tanks. The delay time is controlled by controlling the dwell time of the valve core 1-2 in the second oil circuit state (auxiliary intake / main return). The specific delay time can be determined experimentally based on factors such as the length of the return oil pipeline, and is generally 60-100 seconds. Preferably, the electric actuator 2 is a motor, which can use an angle encoder or similar device to control the rotation angle of the valve core 1-2. By controlling the dwell time of the valve core 1-2 in the second oil circuit state (auxiliary intake / main return) through the electric actuator 2, the return oil delay switching time can be controlled, making control simpler and more convenient.

[0055] Specifically in this embodiment, refer to Figure 5 as well as Figures 9 to 11As shown, the suction valve core section 1-2Ⅰ and the return valve core section 1-2Ⅱ are separated by an intermediate sealing ring 1-3 located in the middle of the valve core 1-2, so that the suction three-way oil passage and the return three-way oil passage are kept in a sealed state. The suction valve core section 1-2Ⅰ has an axially distributed engine suction valve hole section 1-2a, main oil tank suction valve hole section 1-2b and auxiliary oil tank suction valve hole section 1-2c. The engine suction port 1a is opposite to the engine suction valve hole section 1-2a, the main oil tank suction port 1b is opposite to the main oil tank suction valve hole section 1-2b, and the auxiliary oil tank suction port 1c is opposite to the auxiliary oil tank suction valve hole section 1-2c. The engine suction valve hole section 1-2a, the main oil tank suction valve hole section 1-2b and the auxiliary oil tank suction valve hole section 1-2c are respectively provided with valve holes that are connected by the first valve core channel 1-2-4 in the valve core 1-2. The return valve core section 1-2Ⅱ has an axially distributed engine return valve port section 1-2d, main oil tank return valve port section 1-2e, and auxiliary oil tank return valve port section 1-2f. The engine return port 1d is opposite to the engine return valve port section 1-2d, the main oil tank return port 1e is opposite to the main oil tank return valve port section 1-2e, and the auxiliary oil tank return port 1f is opposite to the auxiliary oil tank return valve port section 1-2f. The engine return valve port section 1-2d, the main oil tank return valve port section 1-2e, and the auxiliary oil tank return valve port section 1-2f are respectively provided with valve holes that are connected by the second valve core channel 1-2-5 inside the valve core 1-2. The suction valve core section 1-2Ⅰ and the return valve core section 1-2Ⅱ have different numbers and positions of valve holes on different sections. During the rotation of the valve core 1-2, the valve holes are connected to the corresponding oil ports, thereby changing the oil circuit and thus changing the connection state between the engine suction port 1a, the engine return port 1d and the main and auxiliary oil tanks. The structure is simple, easy to manufacture and has low manufacturing cost.

[0056] Preferably, the valve core 1-2 has a switching rotation angle of 120° between the first oil circuit state, the second oil circuit state, and the third oil circuit state. That is, the valve core 1-2 changes one oil circuit state every 120° of rotation, making the machining of the valve hole simpler and more convenient, and the oil circuit switching convenient and accurate. Specifically, three valve holes are evenly distributed at 120° intervals on both the engine oil suction valve hole section 1-2a and the engine oil return valve hole section 1-2d. That is, in the above three oil circuit states, both the engine oil suction port 1a and the engine oil return port 1d remain in a conductive state with the valve core. Both the main oil tank suction valve orifice section 1-2b and the auxiliary oil tank return valve orifice section 1-2f have one valve orifice and two oil port sealing rings evenly distributed at 120° intervals. In the first oil circuit state, the main oil tank suction valve orifice section 1-2b is in a conductive state with the valve core, while the other two oil circuit states remain closed. In the third oil circuit state, the auxiliary oil tank return valve orifice section 1-2f is in a conductive state with the valve core, while the other two oil circuit states remain closed. Both the auxiliary oil tank suction valve orifice section 1-2c and the main oil tank return valve orifice section 1-2e have two valve orifices and one oil port sealing ring evenly distributed at 120° intervals. In the second and third oil circuit states, the auxiliary oil tank suction valve orifice section 1-2c is in a conductive state with the valve core, while it remains closed in the first oil circuit state. In the first and second oil circuit states, the main oil tank return valve orifice section 1-2e is in a conductive state with the valve core, while it remains closed in the third oil circuit state. (Details follow...) Figures 9 to 11 As shown, for ease of explanation and understanding, engine oil inlet 1a is represented by "③", main oil tank inlet 1b by "⑤", auxiliary oil tank inlet 1c by "④", engine oil return port 1d by "②", main oil tank return port 1e by "⑥", and auxiliary oil tank return port 1f by "①". Figure 9 As shown, when the main oil tank is used for oil supply, valve core 1-2 is in the first oil circuit state, valve port ③ is connected to valve port ⑤, valve port ② is connected to valve port ⑥, and the engine draws oil from the main oil tank and returns oil to the main oil tank. Figure 10 This is an intermediate transition state between supplying fuel from the main fuel tank and the auxiliary fuel tank. At this time, valve cores 1-2 are in the second fuel circuit state, valve port ③ switches to be connected to valve port ④, and valve port ② remains connected to valve port ⑥. The engine begins to draw fuel from the auxiliary fuel tank and returns some fuel from the main fuel tank to the main fuel tank, achieving a delayed switching of fuel return from the main fuel tank. Figure 11 As shown, the engine is completely switched to the auxiliary oil tank for fuel supply. At this time, valve cores 1-2 are in the third oil circuit state, valve port ③ is connected to valve port ④, and valve port ② is connected to valve port ①. The engine draws oil from the auxiliary oil tank and returns oil to the auxiliary oil tank.

[0057] The single-drive delayed fuel supply switching device in this embodiment is mainly used during the initial stage of vehicle cold start. Generally, before the vehicle stops, it uses the main fuel tank for fuel supply, meaning valve core 1-2 is in the first fuel line state, and some high-grade fuel is present in the pipeline. At this time, when the vehicle starts at low temperature, the electric actuator 2 controls valve core 1-2 to rotate and switch to the second fuel line state. The engine starts using low-grade fuel, and fuel is first returned to the main fuel tank for a certain period of time, allowing some high-grade fuel in the pipeline to flow back to the main fuel tank, preventing high-grade fuel from entering the auxiliary fuel tank and causing fuel mixing, which would reduce the performance of the fuel in the auxiliary fuel tank. After a delay period (determined by testing based on the length of the return pipeline), the electric actuator 2 controls valve core 1-2 to rotate and switch to the third fuel line state, completely switching to auxiliary fuel tank fuel supply. After the vehicle has been running for a period of time, the temperature inside the main fuel tank rises. At this time, the electric actuator 2 controls the valve core 1-2 to rotate 120° again, switching to the first fuel circuit state to supply fuel to the main fuel tank. Although some low-grade fuel from the auxiliary fuel tank flows back to the main fuel tank during this process, the low-grade fuel will not affect the performance of the high-grade fuel. The dwell time of the electric actuator 2 in the second state can be controlled by a delay circuit. This delay circuit is similar to existing technology, so the specific circuit structure and principle of the delay control circuit will not be described in detail here.

[0058] like Figure 4 and Figure 5 As shown, in this embodiment, the valve body 1-1 has a straight tubular structure, and the valve core 1-2 is installed into the cavity of the valve body 1-1 from one end. The electric actuator 2 can be fixed to the valve body 1-1 via the connecting flange 3, and the output shaft of the electric actuator 2 is connected to the valve core 1-2. The valve core 1-2 and the cavity of the valve body 1-1 have corresponding sealing rings. Figure 7 and Figure 8 As shown, the aforementioned intermediate sealing ring 1-3 is installed in the sealing ring mounting groove 1-2-1 in the middle of the valve core 1-2. Both the suction valve core section 1-2Ⅰ and the return valve core section 1-2Ⅱ have support ring grooves 1-2-2 in their middle portions. Support ring grooves 1-2-2 contain support rings 1-4 that mate with the valve body 1-1, ensuring reliable sealing between the suction tee and the return tee, and smooth and stable rotation of the valve core 1-2. The outer walls of the main oil tank suction valve hole section 1-2b, the auxiliary oil tank suction valve hole section 1-2c, the main oil tank return valve hole section 1-2e, and the auxiliary oil tank return valve hole section 1-2f are all provided with anti-slip textures 1-2-3 (e.g., ...). Figure 8As shown in the figure, the corresponding oil port sealing ring is located on the sealing sleeve fitted on the outside of each anti-slip texture 1-2-3, which can prevent the sealing sleeve from moving and ensure the precision and reliability of the switching valve. For example, in the first oil circuit state, the engine oil suction port 1a is connected to the valve hole on the engine oil suction valve orifice section 1-2a, and is connected to the valve hole on the main oil tank oil suction valve orifice section 1-2b through the first valve core channel 1-2-4. The valve hole on the main oil tank oil suction valve orifice section 1-2b is connected to the main oil tank oil suction port 1b, while the auxiliary oil tank oil suction valve orifice section 1-2c is sealed to the auxiliary oil tank oil suction port 1c by an oil port sealing ring. Similarly, the engine oil return port 1d is connected to the valve hole on the engine oil return valve orifice section 1-2d, and is connected to the valve hole on the main oil tank oil return valve orifice section 1-2e through the second valve core channel 1-2-5. The valve hole on the main oil tank oil return valve orifice section 1-2e is connected to the main oil tank oil return port 1e, while the auxiliary oil tank oil return valve orifice section 1-2f is sealed to the auxiliary oil tank oil return port 1f by an oil port sealing ring.

[0059] Reference Figures 4 to 6 As shown, in this embodiment, a switching pointer 9 is provided at the end of the valve core 1-2 away from the electric actuator 2. The switching pointer 9 rotates synchronously with the valve core 1-2. A status indicator 1-1a corresponding to the switching pointer 9 is provided on the valve body 1-1, allowing for intuitive observation of the valve core's position and improving the visibility and accuracy of oil circuit switching. Specifically, the end of the valve core 1-2 away from the electric actuator 2 is sealed by a blind end 1-5, and the switching pointer 9 is fixed to the blind end 1-5 by a locking bolt 1-6. The structure is simple and easy to manufacture and assemble. A retaining ring 1-7 is also provided at the end of the valve cavity of the valve body 1-1 away from the electric actuator 2 to prevent the valve core 1-2 from axially moving.

[0060] return Figures 1 to 3 As shown, the single-drive delayed fuel supply switching device of this embodiment also includes a main fuel tank heating sensor. The main fuel tank heating sensor includes a base 4 and a suction pipe 5, a return pipe 6, and a heating pipe 7 installed at the bottom of the base 4. When the main fuel tank heating sensor is installed on the main fuel tank, the suction pipe 5, the return pipe 6, and the heating pipe 7 are all located inside the main fuel tank. A filter 8 can be installed at the bottom of the suction pipe 5. The valve body 1-1 is fixedly installed on one side of the base 4. The main fuel tank suction port 1b is connected to the pipe opening of the suction pipe 5, and the main fuel tank return port 1e is connected to the pipe opening of the return pipe 6. The base 4 is also provided with a heating medium inlet 7a and a heating medium return port 7b, which are respectively connected to both ends of the heating pipe 7. The heating pipe 7 has a spiral structure. The heating medium inlet 7a and the heating medium return port 7b are connected to the heating system circuit. The heating medium is generally water. The heat source and the diesel fuel in the main fuel tank are exchanged through the heating medium to heat the main fuel tank. The heat source is generally the heat generated by the engine. The base 4 is also equipped with a heating medium solenoid valve for controlling the on / off state of the heating medium circuit of the heating tube 7.

[0061] In this embodiment, the engine oil suction port 1a, the auxiliary oil tank suction port 1c, the engine oil return port 1d, and the auxiliary oil tank return port 1f are arranged side-by-side on the same side of the valve body 1-1, while the main oil tank suction port 1b and the main oil tank return port 1e are arranged side-by-side on the other side of the valve body 1-1. The engine oil suction port 1a, the main oil tank suction port 1b, the auxiliary oil tank suction port 1c, the engine oil return port 1d, the main oil tank return port 1e, and the auxiliary oil tank return port 1f are located on the same plane of the valve body 1-1. This valve port design is reasonable in layout and facilitates the connection of the valve body 1-1 to the corresponding pipelines. In particular, the main oil tank suction port 1b and the main oil tank return port 1e can be directly connected to the existing main oil tank heating sensor, integrating the switching valve 1 onto the main oil tank heating sensor, which helps reduce product development costs.

[0062] This utility model discloses a single-drive delayed fuel supply switching device. Through the valve core design of the switching valve, the valve core has different oil circuit states at different rotation angles. The delayed return function of the main and auxiliary fuel tanks can be realized by using a single electric actuator, which reduces manufacturing costs, simplifies the control system, reduces the failure rate, and improves working stability.

[0063] The present invention and its embodiments have been described above illustratively. This description is not restrictive, and the figures shown are only one embodiment of the present invention; the actual structure is not limited thereto. Therefore, if those skilled in the art are inspired by this description and design similar structures and embodiments without departing from the spirit of the present invention, such designs should fall within the protection scope of the present invention.

Claims

1. A single-drive delayed fuel supply switching device, comprising a switching valve (1) and an electric actuator (2), wherein the switching valve (1) comprises a valve body (1-1) and a valve core (1-2) rotatable within the valve body (1-1), and the electric actuator (2) is connected to one end of the valve core (1-2) for driving the valve core (1-2) to rotate within the valve body (1-1) to control the switching of the fuel supply channel; characterized in that: The valve core (1-2) has an oil suction valve core section (1-2Ⅰ) and an oil return valve core section (1-2Ⅱ). The valve body (1-1) is provided with an engine oil suction port (1a), a main oil tank oil suction port (1b), an auxiliary oil tank oil suction port (1c), an engine oil return port (1d), a main oil tank oil return port (1e), and an auxiliary oil tank oil return port (1f). (1c) The suction valve core section (1-2Ⅰ) of the valve core (1-2) forms a suction three-way oil circuit, and the engine return port (1d), main oil tank return port (1e), and auxiliary oil tank return port (1f) form a return three-way oil circuit through the return valve core section (1-2Ⅱ) of the valve core (1-2); the suction three-way oil circuit and the return three-way oil circuit have the following three switchable oil circuit states as the rotation angle of the valve core (1-2) changes: The first oil circuit state is as follows: the engine oil suction port (1a) is connected to the main oil tank oil suction port (1b) through the oil suction valve core section (1-2Ⅰ), and the engine oil return port (1d) is connected to the main oil tank oil return port (1e) through the oil return valve core section (1-2Ⅱ). The second oil circuit is as follows: the engine oil inlet (1a) is connected to the auxiliary oil tank oil inlet (1c) through the oil inlet valve core section (1-2Ⅰ), and the engine oil return port (1d) is connected to the main oil tank oil return port (1e) through the oil return valve core section (1-2Ⅱ). The third oil circuit is as follows: the engine oil inlet (1a) is connected to the auxiliary oil tank oil inlet (1c) through the oil inlet valve core section (1-2Ⅰ), and the engine oil return port (1d) is connected to the auxiliary oil tank oil return port (1f) through the oil return valve core section (1-2Ⅱ).

2. The single-drive delayed fuel supply switching device according to claim 1, characterized in that: The electric actuator (2) has a rotational sequence that drives the valve core (1-2) to switch between the first oil circuit state, the second oil circuit state and the third oil circuit state.

3. The single-drive delayed fuel supply switching device according to claim 1, characterized in that: The suction valve core section (1-2Ⅰ) and the return valve core section (1-2Ⅱ) are separated by an intermediate sealing ring (1-3) located in the middle of the valve core (1-2); The oil suction valve core section (1-2Ⅰ) has an engine oil suction valve hole section (1-2a), a main oil tank oil suction valve hole section (1-2b), and an auxiliary oil tank oil suction valve hole section (1-2c) arranged axially. The engine oil suction port (1a) is opposite to the engine oil suction valve hole section (1-2a), the main oil tank oil suction port (1b) is opposite to the main oil tank oil suction valve hole section (1-2b), and the auxiliary oil tank oil suction port (1c) is opposite to the auxiliary oil tank oil suction valve hole section (1-2c). The engine oil suction valve hole section (1-2a), the main oil tank oil suction valve hole section (1-2b), and the auxiliary oil tank oil suction valve hole section (1-2c) are respectively provided with valve holes that are connected through the first valve core channel (1-2-4) in the valve core (1-2). The return valve core section (1-2Ⅱ) has an axially distributed engine return valve port section (1-2d), main oil tank return valve port section (1-2e), and auxiliary oil tank return valve port section (1-2f). The engine return port (1d) is opposite to the engine return valve port section (1-2d), the main oil tank return port (1e) is opposite to the main oil tank return valve port section (1-2e), and the auxiliary oil tank return port (1f) is opposite to the auxiliary oil tank return valve port section (1-2f). The engine return valve port section (1-2d), the main oil tank return valve port section (1-2e), and the auxiliary oil tank return valve port section (1-2f) are respectively provided with valve holes that are connected by a second valve core channel (1-2-5) inside the valve core (1-2).

4. The single-drive delayed fuel supply switching device according to claim 3, characterized in that: The valve core (1-2) rotates at an angle of 120° when switching between the first oil circuit state, the second oil circuit state, and the third oil circuit state.

5. The single-drive delayed fuel supply switching device according to claim 4, characterized in that: The engine oil suction valve orifice section (1-2a) and the engine oil return valve orifice section (1-2d) each have three valve holes evenly distributed at 120° intervals; the main oil tank oil suction valve orifice section (1-2b) and the auxiliary oil tank oil return valve orifice section (1-2f) each have one valve hole and two oil port sealing rings evenly distributed at 120° intervals; the auxiliary oil tank oil suction valve orifice section (1-2c) and the main oil tank oil return valve orifice section (1-2e) each have two valve holes and one oil port sealing ring evenly distributed at 120° intervals.

6. The single-drive delayed fuel supply switching device according to claim 5, characterized in that: The intermediate sealing ring (1-3) is installed in the sealing ring mounting groove (1-2-1) in the middle of the valve core (1-2). The middle of the oil suction valve core section (1-2Ⅰ) and the oil return valve core section (1-2Ⅱ) are provided with a support ring groove (1-2-2). The support ring groove (1-2-2) is provided with a support ring (1-4) that cooperates with the valve body (1-1). The outer walls of the main oil tank suction valve hole section (1-2b), the auxiliary oil tank suction valve hole section (1-2c), the main oil tank return valve hole section (1-2e), and the auxiliary oil tank return valve hole section (1-2f) are all provided with anti-slip textures (1-2-3). The corresponding oil port sealing ring is located on the sealing sleeve sleeved on the outside of each anti-slip texture (1-2-3).

7. The single-drive delayed fuel supply switching device according to any one of claims 1 to 6, characterized in that: The valve core (1-2) is provided with a conversion pointer (9) at the end away from the electric actuator (2), and the valve body (1-1) is provided with a status indicator (1-1a) that cooperates with the conversion pointer (9).

8. The single-drive delayed fuel supply switching device according to claim 7, characterized in that: The end of the valve core (1-2) away from the electric actuator (2) is sealed by a plug (1-5), and the switching pointer (9) is fixed to the plug (1-5) by a locking bolt (1-6).

9. The single-drive delayed fuel supply switching device according to any one of claims 1 to 6, characterized in that: It also includes a main oil tank heating sensor, which includes a base (4) and an oil suction pipe (5), an oil return pipe (6) and a heating pipe (7) installed at the bottom of the base (4). The valve body (1-1) is fixedly installed on one side of the base (4). The main oil tank suction port (1b) is connected to the pipe opening of the oil suction pipe (5), and the main oil tank return port (1e) is connected to the pipe opening of the oil return pipe (6). The base (4) is also provided with a heating medium inlet (7a) and a heating medium return port (7b) respectively connected to both ends of the heating pipe (7).

10. The single-drive delayed fuel supply switching device according to claim 9, characterized in that: The engine oil inlet (1a), auxiliary oil tank inlet (1c), engine oil return port (1d), and auxiliary oil tank return port (1f) are arranged side by side on the same side of the valve body (1-1), and the main oil tank inlet (1b) and main oil tank return port (1e) are arranged side by side on the other side of the valve body (1-1).

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