Fuel oil supply conversion device with time delay function

Abstract

The utility model discloses a fuel oil supply conversion device with a time delay function, and belongs to the field of fuel oil supply of internal combustion engines. The fuel oil supply conversion device comprises a conversion valve, a first electric actuator and a second electric actuator, the conversion valve comprises a valve body, a first valve element and a second valve element, the valve element is provided with a valve element channel and a plurality of valve element holes communicated with the valve element channel, the two valve elements are respectively connected with one electric actuator, and the first electric actuator is connected with the second 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. Moreover, the valve core realizes the conversion between the oil return three-way oil way and the oil suction three-way oil way through the valve core channel and the valve core hole, compared with a three-way ball valve, the conversion valve is simpler in structure, convenient to manufacture and better in valve body sealing performance, the inlet and outlet positions of the conversion valve are more flexible, and the conversion valve can be additionally arranged on the existing heating sensor for use.

Description

Technical Field

[0001] The utility model relates to a fuel supply device for an internal combustion engine, and more specifically to a fuel supply conversion device with a time delay function. Background Art

[0002] Diesel engines have the advantages of large torque and good economic performance, and are widely used in some heavy vehicles. Diesel engines rely on burning diesel to obtain energy release and convert it into mechanical energy. However, diesel contains paraffin, which easily solidifies in low temperature environments, reducing its fluidity and making it unable to supply fuel to the engine normally, which in turn causes the vehicle to fail to start normally.

[0003] In order to solve the problem that diesel vehicles in northern regions are difficult to start in winter due to diesel solidification, most existing diesel vehicles adopt a main and auxiliary fuel tank design. The main tank is generally used to fill with low-priced high-grade diesel (such as 0# diesel), and the auxiliary tank is used to fill with high-priced low-grade diesel (such as -35# diesel). Low-grade diesel can maintain fluidity in low-temperature environments. During the cold start of the vehicle, the low-grade diesel in the auxiliary tank is used to start the engine, and the heat generated by the engine operation is used to continuously heat the high-grade diesel in the main tank. After the high-grade diesel in the main tank reaches the appropriate temperature, it switches to the main tank for fuel supply to reduce fuel consumption costs.

[0004] At present, the fuel conversion between the main and auxiliary tanks is mainly achieved through a conversion valve, and the engine's oil suction and return are both achieved through a three-way valve to switch the main and auxiliary tanks. In order to facilitate the switching operation of the main and auxiliary tank oil circuits, it has gradually become a trend to use electric conversion valves instead of manual conversion valves. The advantage of electric conversion valves is that they can control the action of the conversion valves through electronic signals. When the two three-way valves are independently controlled, the return oil delay switching can be achieved more accurately, so that the fuel in the return oil pipe can return to the corresponding brand of fuel tank, reducing fuel mixing. For example, Chinese patent number ZL202020873440.9, the authorization announcement date is December 29, 2020, and the name of the invention is: A fuel heater assembly. This application controls the oil inlet ball through the oil inlet motor and the oil return ball through the oil return motor, which can realize the return oil delay setting, and can avoid or reduce the mixing of oil caused by the simultaneous switching of the inlet and return oil of different brands of vehicles. The prior art uses a three-way ball valve as a conversion valve. Although the structure is compact, the ball valve body structure is relatively complex, difficult to manufacture and prone to leakage. In addition, since the inlet and outlet position settings of the ball valve have certain limitations, it is not conducive to installation and use in the existing fuel tank heating sensor. The structure of the heating sensor needs to be redesigned to achieve the integration of the conversion valve and the heating sensor, and the product development cost is relatively high. Summary of the invention

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

[0006] The purpose of the utility model is to overcome the shortcomings of the prior art, such as the complex structure of the fuel conversion valve, easy leakage and difficulty in matching with the existing heating sensor, and to provide a fuel supply conversion device with a delay function. The technical scheme of the utility model is adopted, and the conversion valve is composed of a valve body and two valve cores arranged in the valve body. The two valve cores are respectively connected to an electric actuator, which can control the delayed switching of the return oil three-way oil circuit, so that the fuel in the return oil pipe returns to the fuel tank of the corresponding brand, reducing fuel mixing; and the valve core realizes the conversion of the return oil three-way oil circuit and the suction oil three-way oil circuit through the valve core channel and the valve core hole. Compared with the three-way ball valve, the conversion valve has a simpler structure, is easy to manufacture and has better valve body sealing. The inlet and outlet position arrangement of the conversion valve is also relatively more flexible, and it can be installed on the existing heating sensor for use.

[0007] 2. Technical solution

[0008] In order to achieve the above-mentioned purpose, the technical solution provided by the utility model is:

[0009] The utility model discloses a fuel supply conversion device with a time delay function, comprising a conversion valve, a first electric actuator and a second electric actuator, the conversion valve comprising a valve body, a first valve core and a second valve core, the first valve core and the second valve core are respectively rotatably arranged in the valve body, the first valve core is provided with a first valve core channel and a plurality of valve core holes connected to the first valve core channel, the second valve core is provided with a second valve core channel and a plurality of valve core holes connected to the second valve core channel, the valve body is provided with an engine oil return port, a sub-tank oil return port, an engine oil inlet, a sub-tank oil suction port, a main tank oil suction port and a main tank oil return port, the engine oil return port, the sub-tank oil return port and the main tank oil return port form an oil return three-way oil path through the second valve core, the engine oil inlet, the sub-tank oil suction port and the main tank oil suction port form an oil suction three-way oil path through the first valve core; one end of the first valve core is connected to the first electric actuator, and the first valve core is driven to rotate by the first electric actuator to control the oil suction three-way oil path to rotate and switch between the first state and the second state;

[0010] In the first state, the engine oil inlet is connected to the auxiliary tank oil suction port through the first valve core channel;

[0011] In the second state, the engine oil inlet is connected to the main tank oil suction port through the first valve core channel;

[0012] One end of the second valve core is connected to the second electric actuator, and the second valve core is driven to rotate by the second electric actuator to control the oil return three-way oil circuit to rotate and switch between the third state and the fourth state;

[0013] In the third state, the engine oil return port is connected to the auxiliary tank oil return port through the second valve core channel;

[0014] In the fourth state, the engine oil return port is connected to the main tank oil return port through the second valve core channel.

[0015] Furthermore, the engine oil return port, auxiliary tank oil return port, engine oil inlet and auxiliary tank oil suction port are arranged side by side on the same side of the valve body, and the main tank oil suction port and main tank oil return port are arranged side by side on the other side of the valve body.

[0016] Furthermore, the valve body is a straight tube structure, the first valve core and the second valve core are respectively installed into the corresponding cavities of the valve body from both ends of the valve body, and the first electric actuator and the second electric actuator are respectively fixed to the two ends of the valve body through connecting flanges.

[0017] Furthermore, it also includes a first operating handle and a second operating handle, wherein the first operating handle is connected to one end of the first valve core, and the second operating handle is connected to one end of the second valve core.

[0018] Furthermore, the first operating handle is installed on a first handle seat, which is rotatably and sealingly installed in a cavity on one side of the valve body, one end of the first handle seat is connected to the first valve core, and the other end is connected to the output end of the first electric actuator; the second operating handle is installed on a second handle seat, which is rotatably and sealingly installed in a cavity on the other side of the valve body, one end of the second handle seat is connected to the second valve core, and the other end is connected to the output end of the second electric actuator.

[0019] Furthermore, the first electric actuator and the second electric actuator have the same structure, both including a housing, and a motor, a reduction gear set and a circuit board arranged in the housing, the motor is connected to the output shaft through the reduction gear set, the circuit board is connected to the first micro switch and the second micro switch, and the corresponding gear of the reduction gear set is eccentrically provided with a swing pin that can move in a circular arc between the first micro switch and the second micro switch.

[0020] Furthermore, the first electric actuator and the second electric actuator also include indicator lights electrically connected to the corresponding circuit boards for indicating the states of the oil return three-way oil circuit and the oil suction three-way oil circuit.

[0021] 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 lower part of the base. The valve body is fixedly installed on one side of the base, the main oil tank oil suction port is connected to the pipe mouth of the oil suction pipe, and the main oil tank oil return port is connected to the pipe mouth of the oil return pipe; the base is also provided with a heating medium liquid inlet and a heating medium liquid return port respectively connected to the two ends of the heating pipe.

[0022] Furthermore, a heating medium solenoid valve for controlling the on-off of the heating medium circuit of the heating tube is also installed on the base.

[0023] Furthermore, a fuel tank liquid level detection component and a temperature sensor are also provided at the lower part of the base.

[0024] 3. Beneficial effects

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

[0026] (1) The utility model is a fuel supply conversion device with a delay function, which includes a conversion valve, a first electric actuator and a second electric actuator. The conversion valve includes a valve body, a first valve core and a second valve core. The two valve cores are each connected to an electric actuator, which can control the delayed switching of the return oil three-way oil circuit, so that the fuel in the return oil pipe returns to the corresponding brand of the oil tank, reducing fuel mixing; and the valve core realizes the conversion of the return oil three-way oil circuit and the suction oil three-way oil circuit through the valve core channel and the valve core hole. Compared with the three-way ball valve, the conversion valve has a simpler structure, is easier to manufacture, and has better valve body sealing. The inlet and outlet position arrangement of the conversion valve is also relatively more flexible, and it can be installed on the existing heating sensor for use;

[0027] (2) The utility model is a fuel supply conversion device with a delay function, wherein the engine oil return port, the auxiliary oil tank oil return port, the engine oil inlet port and the auxiliary oil tank oil suction port are arranged side by side on the same side of the valve body, and the main oil tank oil suction port and the main oil tank oil return port are arranged side by side on the other side of the valve body. The valve port design is adopted, and the layout is reasonable, which is convenient for connecting the valve body with the corresponding pipeline. In particular, the main oil tank oil suction port and the main oil tank oil return port can be directly connected to the existing main oil tank heating sensor, and the conversion valve can be integrated into the main oil tank heating sensor, which is conducive to reducing product development costs;

[0028] (3) The utility model is a fuel supply conversion device with a delay function, wherein the valve body is a straight tube structure, the first valve core and the second valve core are respectively installed into the corresponding cavity of the valve body from the two ends of the valve body, and the first electric actuator and the second electric actuator are respectively fixed to the two ends of the valve body through connecting flanges. The valve body has a simple structure and is easy to manufacture. The valve body has strong overall sealing performance, which is conducive to simplifying the sealing structure of the conversion valve and reducing the difficulty of assembly and manufacturing.

[0029] (4) The utility model is a fuel supply switching device with a delay function, which also includes a first operating handle and a second operating handle, the first operating handle is connected to one end of the first valve core, and the second operating handle is connected to one end of the second valve core. On the basis of electric control, the manual switching function is retained, and the automatic mode and manual mode control of the fuel supply switching operation are realized, thereby improving the diversity, convenience and reliability of the fuel supply switching operation;

[0030] (5) The utility model is a fuel supply conversion device with a delay function, wherein the operating handle is mounted on a handle seat, and the handle seat is rotatably and sealingly mounted in a cavity on one side of the valve body, one end of the handle seat is connected to the corresponding valve core, and the other end is connected to the output end of the corresponding electric actuator, which facilitates the connection and coordination between the valve core, the operating handle and the electric actuator, and ensures the sealing performance of the conversion valve;

[0031] (6) The utility model is a fuel supply switching device with a delay function, wherein the first electric actuator and the second electric actuator have the same structure, both comprising a housing, and a motor, a reduction gear set and a circuit board arranged in the housing, the circuit board is connected with a first micro switch and a second micro switch, and a swing pin capable of circular arc movement between the first micro switch and the second micro switch is eccentrically arranged on the corresponding gear of the reduction gear set, and the signal feedback of the micro switch can determine whether the switching valve is switched in place, thereby further ensuring the accuracy of the oil circuit switching;

[0032] (7) The utility model is a fuel supply switching device with a delay function, wherein the first electric actuator and the second electric actuator further include indicator lights electrically connected to the corresponding circuit boards for indicating the status of the oil return three-way oil circuit and the oil suction three-way oil circuit. The indicator lights can more intuitively know the current working position of the switching valve and whether it is switched in place, further improving the reliability of oil circuit switching;

[0033] (8) The utility model provides a fuel supply conversion device with a delay function, which also includes a main fuel tank heating sensor. The conversion valve is integrated on the main fuel tank heating sensor and can be directly installed on the main fuel tank. It has a simple and compact structure, high integration, and is easy to install. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] Figure 1 This is a schematic diagram of the overall structure of a fuel supply conversion device with a time delay function of the utility model;

[0035] Figure 2 It is a partial structural schematic diagram of a fuel supply conversion device with a delay function of the utility model;

[0036] Figure 3 It is a schematic diagram of the split structure of the conversion valve and the main fuel tank heating sensor in a fuel supply conversion device with a delay function of the utility model;

[0037] Figure 4 This is a schematic diagram of the overall structure of a conversion valve in a fuel supply conversion device with a delay function of the utility model;

[0038] Figure 5This is a schematic diagram of the split structure of a conversion valve in a fuel supply conversion device with a delay function of the utility model;

[0039] Figure 6 It is a schematic diagram of the fuel supply conversion device of the utility model in the auxiliary fuel tank oil suction and oil return state;

[0040] Figure 7 This is a schematic diagram of the fuel supply conversion device of the utility model in the state of oil suction and oil return of the main tank;

[0041] Figure 8 It is a schematic diagram of the fuel supply conversion device of the utility model in the state of main fuel tank oil suction and auxiliary fuel tank oil return;

[0042] Fig. 9 It is a schematic diagram of the fuel supply conversion device of the utility model in the state of auxiliary fuel tank sucking oil and main fuel tank returning oil;

[0043] Fig.10 It is a schematic diagram of the disassembled structure of the electric actuator in the fuel supply conversion device of the utility model;

[0044] Fig.11 It is a schematic diagram of the matching state of the swing pin and the micro switch of the electric actuator in the utility model.

[0045] Explanation of the symbols in the schematic diagram:

[0046] 1. Conversion valve; 1a. Engine oil return port; 1b. Auxiliary oil tank oil return port; 1c. Engine oil inlet port; 1d. Auxiliary oil tank oil suction port; 1e. Main oil tank oil suction port; 1f. Main oil tank oil return port; 1-1. Valve body; 1-2. Connecting flange; 1-3. First valve core; 1-3-1. First valve core channel; 1-4. Second valve core; 1-4-1. Second valve core channel; 1-5. Valve core hole; 1-6. Valve core sealing ring; 1-7. Pipe joint; 2. First electric actuator; 2a. Indicator light; 2-1. First half shell; 2-2. The second half shell; 2-3, the motor; 2-4, the reduction gear set; 2-4a, the output shaft; 2-4b, the swing pin; 2-5, the circuit board; 2-5a, the first micro switch; 2-5b, the second micro switch; 3, the second electric actuator; 4, the first operating handle; 4-1, the first handle seat; 5, the second operating handle; 5-1, the second handle seat; 6, the base; 7, the oil suction pipe; 8, the oil return pipe; 9, the heating pipe; 9a, the heating medium liquid inlet; 9b, the heating medium liquid return port; 9c, the heating medium solenoid valve; 10, the filter. DETAILED DESCRIPTION

[0047] In order to further understand the content of the utility model, the utility model is described in detail in conjunction with the drawings and embodiments.

[0048] [Example]

[0049] Combination Figures 1 to 9 As shown, a fuel supply conversion device with a time-delay function in this embodiment includes a conversion valve 1, a first electric actuator 2 and a second electric actuator 3. The conversion valve 1 includes a valve body 1-1, a first valve core 1-3 and a second valve core 1-4. The first valve core 1-3 and the second valve core 1-4 are rotatably arranged in the valve body 1-1 respectively. The structures of the first valve core 1-3 and the second valve core 1-4 are basically similar, and both adopt a core rod structure. The first valve core 1-3 has a first valve core channel 1-3-1 and a plurality of valve core holes 1-5 connected to the first valve core channel 1-3-1. The second valve core 1- 4 is provided with a second valve core channel 1-4-1 and a plurality of valve core holes 1-5 connected with the second valve core channel 1-4-1, and the valve body 1-1 is provided with an engine oil return port 1a, an auxiliary tank oil return port 1b, an engine oil inlet 1c, an auxiliary tank oil suction port 1d, a main tank oil suction port 1e and a main tank oil return port 1f. The engine oil return port 1a, the auxiliary tank oil return port 1b and the main tank oil return port 1f form an oil return three-way oil circuit through the second valve core 1-4, and the engine oil inlet port 1c, the auxiliary tank oil suction port 1d and the main tank oil suction port 1e form an oil suction three-way oil circuit through the first valve core 1-3. When the first valve core 1-3 is rotated, the valve core holes 1-5 on the first valve core 1-3 change the corresponding positions with the engine oil inlet 1c, the auxiliary tank oil suction port 1d and the main tank oil suction port 1e, thereby realizing the switching of the oil suction three-way oil circuit; similarly, when the second valve core 1-4 is rotated, the valve core holes 1-5 on the second valve core 1-4 change the corresponding positions with the engine oil return port 1a, the auxiliary tank oil return port 1b and the main tank oil return port 1f, thereby realizing the switching of the oil return three-way oil circuit. The first valve core 1-3 and the second valve core 1-4 are also provided with a plurality of valve core sealing rings 1-6 that are sealed with the inner cavity of the valve body 1-1 to ensure the sealing of each oil circuit. One end of the first valve core 1-3 is connected to the first electric actuator 2, and the first valve core 1-3 is driven to rotate through the first electric actuator 2 to control the oil suction three-way oil circuit to rotate and switch between the first state and the second state; in the first state, the engine oil inlet 1c is connected with the auxiliary tank oil suction port 1d through the first valve core channel 1-3-1, and the auxiliary tank supplies oil to the engine; in the second state, the engine oil inlet 1c is connected with the main tank oil suction port 1e through the first valve core channel 1-3-1, and the main tank supplies oil to the engine.

[0050] One end of the second valve core 1-4 is connected to the second electric actuator 3, and the second valve core 1-4 is driven to rotate through the second electric actuator 3 to control the oil return three-way oil circuit to rotate and switch between the third state and the fourth state; in the third state, the engine oil return port 1a is connected with the auxiliary tank oil return port 1b through the second valve core channel 1-4-1, and the engine returns oil to the auxiliary tank; in the fourth state, the engine oil return port 1a is connected with the main tank oil return port 1f through the second valve core channel 1-4-1, and the engine returns oil to the main tank.

[0051] The switching of the oil suction three-way oil circuit and the oil return three-way oil circuit is controlled by the first electric actuator 2 and the second electric actuator 3 respectively. The first electric actuator 2 and the second electric actuator 3 can be controlled to delay the action according to the length of the oil return pipeline, so as to realize the delayed switching of the oil return three-way oil circuit, so that the fuel in the oil return pipe returns to the corresponding brand of fuel tank, reducing fuel mixing. In addition, the valve core realizes the switching of the oil return three-way oil circuit and the oil suction three-way oil circuit through the valve core channel and the valve core hole. Compared with the three-way ball valve, the conversion valve 1 has a simpler structure, is easy to manufacture, and has better valve body sealing. The inlet and outlet position arrangement of the conversion valve 1 is also relatively more flexible, and can be installed on the existing heating sensor.

[0052] Reference Figure 4 As shown, in this embodiment, the engine oil return port 1a, the auxiliary tank oil return port 1b, the engine oil inlet 1c and the auxiliary tank oil suction port 1d are arranged side by side on the same side of the valve body 1-1, and the main tank oil suction port 1e and the main tank oil return port 1f are arranged side by side on the other side of the valve body 1-1. The engine oil return port 1a, the auxiliary tank oil return port 1b, the engine oil inlet 1c, the auxiliary tank oil suction port 1d, the main tank oil suction port 1e and the main tank oil return port 1f are located on the same plane of the valve body 1-1. The valve port design has a reasonable layout and is convenient for connecting the valve body 1-1 to the corresponding pipeline. In particular, the main tank oil suction port 1e and the main tank oil return port 1f can be used to directly connect to the existing main tank heating sensor, and the conversion valve 1 can be integrated into the main tank heating sensor, which is conducive to reducing product development costs. Refer to Figures 6 to 9 As shown, for the convenience of explanation and understanding, the engine oil return port 1a is indicated by "①", the auxiliary tank oil return port 1b is indicated by "②", the engine oil inlet 1c is indicated by "③", the auxiliary tank oil suction port 1d is indicated by "④", the main tank oil suction port 1e is indicated by "⑤", and the main tank oil return port 1f is indicated by "⑥". As the name implies, when in use, the engine oil return port 1a is connected to the engine oil return pipeline, the auxiliary tank oil return port 1b is connected to the auxiliary tank's oil return pipeline, the engine oil inlet 1c is connected to the engine oil suction pipeline, the auxiliary tank oil suction port 1d is connected to the auxiliary tank's oil outlet pipeline, the main tank oil suction port 1e is connected to the main tank's oil outlet pipeline, and the main tank oil return port 1f is connected to the main tank's oil return pipeline. As shown Figure 6As shown, the first valve core 1-3 is in the first state, and the second valve core 1-4 is in the third state, that is, the engine is supplied with oil from the auxiliary tank and returns oil to the auxiliary tank. At this time, the ①# valve port is connected to the ②# valve port, and the ③# valve port is connected to the ④# valve port, and the engine draws oil from the auxiliary tank and returns oil to the auxiliary tank. Figure 7 It shows the state of switching to the main tank oil supply, at this time, the first valve core 1-3 is in the second state, the second valve core 1-4 is in the fourth state, the ①# valve port is connected with the ⑥# valve port, the ③# valve port is connected with the ⑤# valve port, and the engine sucks oil from the main tank and returns oil to the main tank. Figure 8 The figure shows the delayed switching state of the oil return. After the engine is supplied by the auxiliary tank for a period of time, the fuel in the main tank reaches the supply temperature. At this time, it is necessary to switch to the main tank for oil supply. If the oil inlet and return are switched at the same time, the low-grade fuel in the return pipe will return to the main tank, resulting in the waste of low-grade fuel. At this time, the first electric actuator 2 controls the first valve core 1-3 to rotate and switch, from the first state to the second state, that is, the oil suction from the auxiliary tank is switched to the oil suction from the main tank. The second electric actuator 3 delays for a period of time before acting again, controlling the second valve core 1-4 to rotate and switch, from the third state to the fourth state, that is, the oil return to the auxiliary tank is switched to the oil return to the main tank. Through the delayed action of the second electric actuator 3, the low-grade diesel in the return pipe can be returned to the auxiliary tank, reducing or avoiding the waste of low-grade fuel. The specific delay time can be determined according to the test of the length of the return oil pipeline, and the general delay time is 60 to 100 seconds. Fig. 9 Another delayed oil return switching state is shown, which is mainly used in the cold start stage. Generally speaking, the main fuel tank is used to supply oil before the vehicle stops running, and there is some high-grade fuel in the pipeline. At this time, when the vehicle starts at low temperature, the first electric actuator 2 controls the first valve core 1-3 to rotate and switch, and the auxiliary fuel tank is used to supply oil to the engine. The second electric actuator 3 delays for a period of time before acting, that is, it returns oil to the main tank for a certain period of time and then switches to the auxiliary tank to return oil, preventing high-grade fuel from entering the auxiliary tank and causing fuel mixing, thereby reducing the performance of the fuel in the auxiliary tank. The specific delay time can be determined based on tests such as the length of the return oil pipeline, and the general delay time is 40 to 60 seconds. Through the independent control of the first valve core 1-3 and the second valve core 1-4 by the first electric actuator 2 and the second electric actuator 3, the delayed switching of the return oil three-way oil circuit and the suction oil three-way oil circuit is realized, reducing fuel mixing and waste. The delay of the first electric actuator 2 and the second electric actuator 3 is controlled by a delay circuit, which is similar to the prior art, so the specific circuit structure and principle of the delay control circuit will not be described in detail here.

[0053] Further integration Figure 4 and Figure 5As shown, in this embodiment, the valve body 1-1 is a straight tube structure, the first valve core 1-3 and the second valve core 1-4 are respectively installed in the corresponding cavity of the valve body 1-1 from both ends of the valve body 1-1, and the first electric actuator 2 and the second electric actuator 3 are respectively fixed to the two ends of the valve body 1-1 through the connecting flange 1-2. The valve body 1-1 has a simple structure and is easy to manufacture. The valve body 1-1 has strong overall sealing performance, which is conducive to simplifying the sealing structure of the conversion valve 1 and reducing the difficulty of assembly and manufacturing.

[0054] The fuel supply switching device with a delay function of this embodiment also includes a first operating handle 4 and a second operating handle 5. The first operating handle 4 is connected to one end of the first valve core 1-3, and the second operating handle 5 is connected to one end of the second valve core 1-4. The first operating handle 4 can manually control the switching action of the first valve core 1-3, and the second operating handle 5 can manually control the switching action of the second valve core 1-4. The manual switching function is retained on the basis of electric control, and the automatic mode and manual mode control of the fuel supply switching operation are realized, which improves the diversity, convenience and reliability of the fuel supply switching operation. Specifically, the first operating handle 4 is mounted on the first handle seat 4-1, which is rotatably and sealably mounted in the cavity on one side of the valve body 1-1, one end of the first handle seat 4-1 is connected to the first valve core 1-3, and the other end is connected to the output end of the first electric actuator 2; the second operating handle 5 is mounted on the second handle seat 5-1, which is rotatably and sealably mounted in the cavity on the other side of the valve body 1-1, one end of the second handle seat 5-1 is connected to the second valve core 1-4, and the other end is connected to the output end of the second electric actuator 3. The first operating handle 4 and the second operating handle 5 extend from the notches at both ends of the valve body 1-1, respectively, and the notches can limit the rotation range of the first operating handle 4 and the second operating handle 5. The above handle seat design facilitates the connection and coordination between the valve core, the operating handle and the electric actuator, and ensures the sealing performance of the conversion valve.

[0055] In this embodiment, the first electric actuator 2 and the second electric actuator 3 have the same structure. Figure 5 , Fig.10 and Fig.11As shown, the first electric actuator 2 and the second electric actuator 3 both include a housing, and a motor 2-3, a reduction gear set 2-4 and a circuit board 2-5 arranged in the housing. The housing can be formed by assembling a first half shell 2-1 and a second half shell 2-2. The circuit board 2-5 can be fixed in the first half shell 2-1, and the motor 2-3 can be fixed on the circuit board 2-5. The motor 2-3 is connected to the output shaft 2-4a through the reduction gear set 2-4. The reduction gear set 2-4 preferably adopts a multi-stage reduction gear, and the output torque of the output shaft 2-4a can be increased through the reduction gear set 2-4. The circuit board 2-5 is connected to the first micro switch 2-5a and the second micro switch 2-5b. The corresponding gear of the reduction gear set 2-4 is eccentrically provided with a swing pin 2-4b that can move in a circular arc between the first micro switch 2-5a and the second micro switch 2-5b. Taking the first electric actuator 2 as an example, when working, the motor 2-3 drives the reduction gear set 2-4 to work, so that the swing pin 2-4b makes a circular motion around the gear shaft of the corresponding gear, and the first valve core 1-3 rotates to the first state. At this time, the swing pin 2-4a triggers the first micro switch 2-5a to generate a control signal to control the motor 2-3 to stop working. Similarly, when the first valve core 1-3 rotates in the opposite direction to the second state, the swing pin 2-4a swings in the opposite direction to contact the second micro switch 2-5b to generate a control signal to control the motor 2-3 to stop working, thereby ensuring the accuracy of the working position of the first valve core 1-3. With the above-mentioned electric actuator, it is possible to determine whether the switching valve is switched in place through the signal feedback of the micro switch, further ensuring the accuracy of the oil circuit switching. In addition. The first electric actuator 2 and the second electric actuator 3 also include an indicator light 2a electrically connected to the corresponding circuit board 2-5 for indicating the status of the oil return three-way oil circuit and the oil suction three-way oil circuit. The indicator light 2a can be set on the housing of the electric actuator, or the indicator signal can be connected to the vehicle cab through the line. The different positions of the valve core correspond to the different indication states of the indicator light 2a. The indicator light 2a can more intuitively know the current working position of the conversion valve 1 and whether it is switched in place, which further improves the reliability of the oil circuit switching. For example, the indicator light 2a can be set as a three-color indicator light, namely green light, blue light and yellow light. The green light indicates that the auxiliary oil tank is supplied with oil at this time, the blue light indicates that the main oil tank is supplied with oil at this time, and the yellow light indicates that the switch is not in place at this time. When manually switching through the operating handle, the rotation of the operating handle acts in the reverse direction on the reduction gear set 2-4, and also drives the swing pin 2-4b to move, so the operating handle can also indicate the switching state through the indicator light 2a.

[0056] return Figures 1 to 3As shown, the fuel supply conversion device with a delay function of this embodiment also includes a main tank heating sensor, which includes a base 6 and an oil suction pipe 7, an oil return pipe 8 and a heating pipe 9 installed at the lower part of the base 6. When the main tank heating sensor is installed on the main tank, the oil suction pipe 7, the oil return pipe 8 and the heating pipe 9 are all located inside the main tank, and a filter 10 can be arranged at the bottom of the oil suction pipe 7; the valve body 1-1 is fixedly installed on one side of the base 6, the main tank oil suction port 1e is connected to the pipe mouth of the oil suction pipe 7, and the main tank oil return port 1f is connected to the pipe mouth of the oil return pipe 8; the base 6 is also provided with a heating medium inlet 9a and a heating medium return port 9b respectively connected to the two ends of the heating pipe 9, the heating pipe 9 is a spiral structure, the heating medium inlet 9a and the heating medium return port 9b are connected to the heating system loop, the heating medium is generally water, and the heat source is realized through the heating medium. Heat exchange with the diesel in the main tank is realized to achieve heating of the main tank, and the heat source generally comes from the heat generated by the engine. A heating medium solenoid valve 9c for controlling the on / off of the heating medium circuit of the heating tube 9 is also installed on the base 6. The fuel supply conversion device with a delay function of this embodiment integrates the conversion valve on the main tank heating sensor and can be directly installed on the main tank. It has a simple and compact structure, high integration, and is easy to install.

[0057] In addition, pipe joints 1-7 are provided on the engine oil return port 1a, the auxiliary oil tank oil return port 1b, the engine oil inlet port 1c, and the auxiliary oil tank oil suction port 1d. The pipe joints 1-7 adopt a bamboo joint structure, which is convenient for connecting with the oil pipe. The lower part of the base 6 is also provided with a tank level detection component and a temperature sensor, which can detect the diesel level height and temperature in the main oil tank. As for the other structures and working principles of the main oil tank heating sensor, they are similar to the prior art, so they will not be described in detail here.

[0058] The utility model discloses a fuel supply conversion device with a delay function, wherein the conversion valve consists of a valve body and two valve cores arranged in the valve body, and the two valve cores are respectively connected to an electric actuator, which can control the delayed switching of the return oil three-way oil circuit, so that the fuel in the return oil pipe returns to the fuel tank of the corresponding brand, thereby reducing fuel mixing; and the valve core realizes the conversion of the return oil three-way oil circuit and the suction oil three-way oil circuit through the valve core channel and the valve core hole. Compared with the three-way ball valve, the conversion valve has a simpler structure, is convenient to manufacture and has better valve body sealing performance. The inlet and outlet position arrangement of the conversion valve is also relatively more flexible, and it can be installed on the existing heating sensor for use.

[0059] The above schematically describes the present invention and its implementation methods, which are not restrictive. The drawings show only one implementation method of the present invention, and the actual structure is not limited thereto. Therefore, if ordinary technicians in the field are inspired by it and design structural methods and embodiments similar to the technical solution without creative design without departing from the purpose of the present invention, they should all fall within the protection scope of the present invention.

Claims

1. A fuel supply conversion device with a time delay function, comprising a conversion valve (1), a first electric actuator (2) and a second electric actuator (3), characterized in that: The conversion valve (1) comprises a valve body (1-1), a first valve core (1-3) and a second valve core (1-4); the first valve core (1-3) and the second valve core (1-4) are rotatably arranged in the valve body (1-1); the first valve core (1-3) has a first valve core channel (1-3-1) and a plurality of valve core holes (1-5) connected to the first valve core channel (1-3-1); the second valve core (1-4) has a second valve core channel (1-4-1) and a plurality of valve core holes (1-5) connected to the second valve core channel (1-4-1); the valve body (1-1) is provided with an engine oil return port (1a), an auxiliary oil tank oil return port (1b), an engine oil inlet port (1c), and a plurality of valve core holes (1-5) connected to the second valve core channel (1-4-1). 1c), an auxiliary tank oil suction port (1d), a main tank oil suction port (1e) and a main tank oil return port (1f); the engine oil return port (1a), the auxiliary tank oil return port (1b) and the main tank oil return port (1f) form an oil return three-way oil circuit through a second valve core (1-4); the engine oil inlet (1c), the auxiliary tank oil suction port (1d) and the main tank oil suction port (1e) form an oil suction three-way oil circuit through a first valve core (1-3); one end of the first valve core (1-3) is connected to a first electric actuator (2), and the first valve core (1-3) is driven to rotate through the first electric actuator (2) to control the oil suction three-way oil circuit to rotate and switch between a first state and a second state; In the first state, the engine oil inlet (1c) is connected to the auxiliary oil tank oil suction port (1d) through the first valve core channel (1-3-1); In the second state, the engine oil inlet (1c) is connected to the main oil tank oil suction port (1e) through the first valve core channel (1-3-1); One end of the second valve core (1-4) is connected to the second electric actuator (3), and the second valve core (1-4) is driven to rotate by the second electric actuator (3) to control the oil return three-way oil circuit to rotate and switch between the third state and the fourth state; In the third state, the engine oil return port (1a) is connected to the auxiliary tank oil return port (1b) via the second valve core channel (1-4-1); In the fourth state, the engine oil return port (1a) is connected to the main tank oil return port (1f) through the second valve core channel (1-4-1).

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

3. The fuel supply conversion device with delayed function according to claim 2 is characterized in that: The valve body (1-1) is in the form of a straight tube; the first valve core (1-3) and the second valve core (1-4) are respectively inserted into corresponding cavities of the valve body (1-1) from both ends of the valve body (1-1); and the first electric actuator (2) and the second electric actuator (3) are respectively fixed to both ends of the valve body (1-1) via connecting flanges (1-2).

4. The fuel supply conversion device with delayed function according to claim 1 is characterized in that: It also comprises a first operating handle (4) and a second operating handle (5), wherein the first operating handle (4) is connected to one end of the first valve core (1-3), and the second operating handle (5) is connected to one end of the second valve core (1-4).

5. The fuel supply conversion device with delayed function according to claim 4 is characterized in that: The first operating handle (4) is mounted on a first handle seat (4-1), and the first handle seat (4-1) is rotatably and hermetically mounted in a cavity on one side of the valve body (1-1), one end of the first handle seat (4-1) is connected to the first valve core (1-3), and the other end is connected to the output end of the first electric actuator (2); the second operating handle (5) is mounted on a second handle seat (5-1), and the second handle seat (5-1) is rotatably and hermetically mounted in a cavity on the other side of the valve body (1-1), one end of the second handle seat (5-1) is connected to the second valve core (1-4), and the other end is connected to the output end of the second electric actuator (3).

6. The fuel supply conversion device with delayed function according to claim 1 is characterized in that: The first electric actuator (2) and the second electric actuator (3) have the same structure, and both comprise a housing, and a motor (2-3), a reduction gear set (2-4) and a circuit board (2-5) arranged in the housing; the motor (2-3) is transmission-connected to an output shaft (2-4a) via the reduction gear set (2-4); a first micro switch (2-5a) and a second micro switch (2-5b) are connected to the circuit board (2-5); and a swing pin (2-4b) capable of circular arc movement between the first micro switch (2-5a) and the second micro switch (2-5b) is eccentrically provided on the corresponding gear of the reduction gear set (2-4).

7. The fuel supply conversion device with delayed function according to claim 6 is characterized in that: The first electric actuator (2) and the second electric actuator (3) further comprise indicator lights (2a) electrically connected to the corresponding circuit boards (2-5) and used to indicate the states of the oil return three-way oil circuit and the oil suction three-way oil circuit.

8. The fuel supply conversion device with a delayed function according to any one of claims 1 to 7, characterized in that: It also includes a main oil tank heating sensor, which includes a base (6) and an oil suction pipe (7), an oil return pipe (8) and a heating pipe (9) installed at the bottom of the base (6); the valve body (1-1) is fixedly installed on one side of the base (6); the main oil tank oil suction port (1e) is connected to the pipe mouth of the oil suction pipe (7); the main oil tank oil return port (1f) is connected to the pipe mouth of the oil return pipe (8); and the base (6) is also provided with a heating medium liquid inlet (9a) and a heating medium liquid return port (9b) respectively connected to the two ends of the heating pipe (9).

9. The fuel supply conversion device with delayed function according to claim 8 is characterized in that: The base (6) is also provided with a heating medium solenoid valve (9c) for controlling the on / off of the heating medium circuit of the heating tube (9).

10. The fuel supply conversion device with delayed function according to claim 8, characterized in that: The lower part of the base (6) is also provided with an oil tank liquid level detection component and a temperature sensor.

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