Electrically controlled time-delay switching fuel supply and heating device for cold region bulldozer

Abstract

The utility model discloses a cold region bulldozer's electric control delay switching fuel supply and heating device relates to fuel supply technical field, including the oil tank structure, all oil tank structure inside fixed mounting has the baffle, and the baffle divides into oil tank big chamber and oil tank small chamber two independent space in oil tank structure, and the lower extreme fixed mounting of oil tank structure has electric control fuel reversing valve, and the lower side wall of oil tank small chamber fixed mounting has first oil outlet flange, and first oil outlet flange is connected with electric control fuel reversing valve through small chamber oil inlet pipe, and the lower side wall of oil tank big chamber fixed mounting has second oil outlet flange, and through setting oil tank big chamber, oil tank small chamber and electric control delay fuel reversing valve, realize low temperature start when oil tank small chamber high mark diesel oil oil supply, engine coolant tank water temperature stabilizes and switches to oil tank big chamber low mark diesel oil oil supply, avoid all -round use high -priced high mark diesel oil, effectively reduce the fuel cost expenditure of cold region bulldozer operation.

Description

Technical Field

[0001] This utility model relates to the field of fuel supply technology, and in particular to an electronically controlled time-delay switching fuel supply and heating device for bulldozers in cold regions. Background Technology

[0002] In cold regions, bulldozers, as key construction machinery, are significantly constrained by low-temperature environments in their engine fuel supply systems. Currently, bulldozers in cold regions must use high-octane diesel (such as -35# or -50#) to ensure normal starting and operation in extremely cold or frigid conditions. However, there is a significant price difference between high-octane and low-octane diesel (such as 0#). In cold northern regions of my country, the price of -35# diesel is typically 20% to 30% higher than that of 0# diesel in winter. In warmer southern regions, where 0# diesel is the primary fuel source and low-octane fuel is scarce, the price difference for high-octane diesel is even more pronounced. This results in persistently high fuel costs for bulldozers operating in cold regions, significantly increasing equipment operating costs and negatively impacting the economic viability of construction projects.

[0003] Meanwhile, the engine generates a large amount of heat during operation. Under normal operating conditions, most of the heat carried by the coolant is directly dissipated into the air through the cooling system, failing to be effectively recovered and utilized, resulting in energy waste. Furthermore, in low-temperature environments, low-grade diesel fuel is prone to wax precipitation due to excessively low temperatures, clogging the fuel filter and causing poor fuel supply, affecting normal engine operation. This problem further limits the application of low-grade diesel fuel in bulldozers operating in cold regions, making the existing fuel supply system significantly inadequate in terms of adaptability and energy utilization under cold-weather conditions. Utility Model Content

[0004] The main purpose of this utility model is to provide an electronically controlled time-delay switching fuel supply and heating device for bulldozers in cold regions, which can effectively solve the problems in the background art.

[0005] To achieve the above objectives, the technical solution adopted by this utility model is as follows: An electronically controlled delayed-switching fuel supply and heating device for bulldozers in cold regions includes a fuel tank structure. A partition is fixedly installed within the fuel tank structure, dividing the tank into two independent spaces: a large fuel tank chamber and a small fuel tank chamber. An electronically controlled fuel reversing valve is fixedly installed at the lower end of the fuel tank structure. A first fuel outlet flange is fixedly installed on the lower wall of the small fuel tank chamber, connected to the electronically controlled fuel reversing valve via a small chamber inlet pipe. A second fuel outlet flange is fixedly installed on the lower wall of the large fuel tank chamber, and the second fuel outlet flange is connected to... The large-cavity fuel outlet pipe is connected to the electronically controlled fuel reversing valve. The electronically controlled fuel reversing valve is connected to the small chamber of the fuel tank via the small-cavity return pipe. The electronically controlled fuel reversing valve is connected to the large chamber of the fuel tank via the large-cavity return pipe. The electronically controlled fuel reversing valve is connected to the engine via the engine inlet pipe and the engine return pipe. The second fuel outlet flange is connected to the engine coolant tank via the fuel heating water inlet pipe and the fuel heating water return pipe. The second fuel outlet flange includes a heat exchanger located in the large chamber of the fuel tank. The large-cavity fuel outlet pipe and the engine inlet pipe are electrically heated fuel pipes.

[0006] Preferably, the electronically controlled fuel reversing valve is electrically connected to the switch in the cab, and the heating control system of the large-cavity fuel outlet pipe and the engine fuel inlet pipe is linked to the electronically controlled fuel reversing valve.

[0007] Preferably, the first oil outlet flange is provided with a first oil tank drain port.

[0008] Preferably, the second oil outlet flange is provided with a second oil tank drain port.

[0009] Preferably, the second oil outlet flange is provided with a fuel heating water inlet and a fuel heating water return outlet. The fuel heating water inlet is connected to the engine coolant tank through a fuel heating water inlet pipe, and the fuel heating water return outlet is connected to the engine coolant tank through a fuel heating water return pipe.

[0010] Compared with the prior art, the present invention has the following beneficial effects: By configuring a large fuel tank chamber, a small fuel tank chamber, and an electronically controlled delayed fuel reversing valve, the system achieves high-grade diesel fuel supply in the small fuel tank chamber during cold starts, and switches to low-grade diesel fuel supply in the large fuel tank chamber once the engine coolant temperature stabilizes. This avoids using expensive, high-grade diesel fuel throughout the entire operation, effectively reducing fuel costs for bulldozers operating in cold regions. Furthermore, by incorporating a heat exchanger integrated into the second fuel outlet flange and connected to the engine coolant circulation system, waste heat from the engine coolant can be transferred to the low-grade diesel fuel in the large fuel tank chamber, fully recovering and utilizing the engine coolant's heat. The waste heat from the engine coolant circulation system reduces energy waste; by setting up electrically heated oil pipes linked to the electronic fuel reversing valve, namely the large-cavity oil inlet pipe and the engine oil inlet pipe, heating is activated simultaneously when switching to low-grade diesel fuel supply, preventing low-grade diesel from precipitating wax in the pipeline and clogging the filter, thus ensuring smooth fuel supply; by setting up an integrated electronic control switching, heating and waste heat utilization system, the electrification and intelligence level of the bulldozer is improved, the adaptability of the equipment to working conditions in high or extremely cold environments is enhanced, and the stable start-up and operation of the bulldozer is ensured. Attached Figure Description

[0011] Figure 1 This is a schematic diagram of the overall structure of this utility model; Figure 2 This is a partial cross-sectional view of the fuel tank structure of this utility model; Figure 3 This is a schematic diagram of the structure of the second oil outlet flange of this utility model; Figure 4 This is a schematic diagram of the structure of the electronically controlled fuel reversing valve of this utility model; Figure 5 This is a signal flow diagram of the present invention; Figure 6 This is a circuit diagram of the present invention.

[0012] In the diagram: 1. Large fuel tank chamber; 2. Small fuel tank chamber; 3. Electronic fuel reversing valve; 4. First fuel outlet flange; 5. Second fuel outlet flange; 501. Fuel heating water inlet; 502. Fuel heating water return outlet; 503. Heat exchanger; 6. First fuel tank drain outlet; 7. Second fuel tank drain outlet; 8. Small chamber fuel inlet pipe; 9. Small chamber fuel return pipe; 10. Large chamber fuel return pipe; 11. Large chamber fuel outlet pipe; 12. Engine fuel inlet pipe; 13. Engine fuel return pipe; 14. Fuel heating water inlet pipe; 15. Fuel heating water return pipe; 16. Baffle plate; 17. Fuel tank structure. Detailed Implementation

[0013] To make the technical means, creative features, objectives and effects of this utility model easier to understand, the present utility model will be further described below in conjunction with specific embodiments.

[0014] Please see Figure 1 , Figure 2 , Figure 3 , Figure 4 , Figure 5 , Figure 6 As shown, the electronically controlled delayed-switching fuel supply and heating device for bulldozers in cold regions includes a fuel tank structure 17. A partition 16 is fixedly installed inside the fuel tank structure 17, dividing it into two independent spaces: a large fuel tank chamber 1 and a small fuel tank chamber 2. An electronically controlled fuel reversing valve 3 is fixedly installed at the lower end of the fuel tank structure 17. A first fuel outlet flange 4 is fixedly installed on the lower wall of the small fuel tank chamber 2, and is connected to the electronically controlled fuel reversing valve 3 via a small chamber inlet pipe 8. A second fuel outlet flange 5 is fixedly installed on the lower wall of the large fuel tank chamber 1, and is connected to the large chamber inlet pipe 8 via a small chamber inlet pipe 8. The oil outlet pipe 11 is connected to the electronically controlled fuel reversing valve 3. The electronically controlled fuel reversing valve 3 is connected to the small chamber 2 of the fuel tank through the small chamber return oil pipe 9. The electronically controlled fuel reversing valve 3 is connected to the large chamber 1 of the fuel tank through the large chamber return oil pipe 10. The electronically controlled fuel reversing valve 3 is connected to the engine through the engine inlet oil pipe 12 and the engine return oil pipe 13. The second oil outlet flange 5 is connected to the engine coolant tank through the fuel heating water inlet pipe 14 and the fuel heating water return pipe 15. The second oil outlet flange 5 includes a heat exchanger 503, which is located in the large chamber 1 of the fuel tank. The large chamber oil outlet pipe 11 and the engine inlet oil pipe 12 are electrically heated oil pipes.

[0015] Specifically, the electronically controlled fuel reversing valve 3 is electrically connected to the switch in the cab. The heating control system of the large-cavity fuel outlet pipe 11 and the engine fuel inlet pipe 12 is linked to the electronically controlled fuel reversing valve 3. A first fuel tank drain port 6 is provided on the first fuel outlet flange 4, and a second fuel tank drain port 7 is provided on the second fuel outlet flange 5. A fuel heating water inlet 501 and a fuel heating water return port 502 are provided on the second fuel outlet flange 5. The fuel heating water inlet 501 is connected to the engine coolant tank through the fuel heating water inlet pipe 14, and the fuel heating water return port 502 is connected to the engine coolant tank through the fuel heating water return pipe 15. The engine coolant tank connection is based on a time-delayed electronically controlled fuel reversing valve 3. This is a two-position, three-way valve that uses a solenoid valve to drive valve cores in different fuel supply channels to switch fuel tanks. The electronically controlled fuel reversing valve 3 features a delayed return fuel switching function. This is achieved by setting a time difference in the solenoid valve's switching action. After the inlet fuel line completes the switching, to prevent fuel mixing from affecting engine operation, the return fuel valve core completes the switching action after a certain period. Simultaneously, the electronically controlled fuel reversing valve 3 has an automatic switching function to prevent the driver from continuously using fuel due to missed operations. If the fuel tank small chamber 2 is not switched during fuel supply or when the vehicle is stopped, the vehicle may be unable to start. Through a well-designed gear structure, the internal electric motor's drive gear can independently drive the valve cores of the fuel inlet and return channels. When the operator presses the cab switch (i.e., the command to switch to fuel tank large chamber 1), the control circuit detects the operator's switching command and energizes the electronic fuel reversing valve 3, causing the valve core to rotate 90 degrees. This opens the fuel supply channel of fuel tank large chamber 1 and closes the fuel supply channel of fuel tank small chamber 2. At this time, fuel tank large chamber 1 supplies fuel to the engine. The working fuel supply channel has completed the switch from secondary to primary, with the switching time within 150ms. At the same time, the return fuel channel remains unchanged, with the return fuel channel of small chamber 2 of the fuel tank still open, and the engine return fuel returning to small chamber 2 of the fuel tank. After a certain delay (i.e., ensuring that the high-grade fuel in the pipeline returns to small chamber 2 of the fuel tank), the solenoid valve drives the return fuel channel valve core to rotate 90 degrees, opening the return fuel channel of large chamber 1 of the fuel tank and closing the return fuel channel of small chamber 2 of the fuel tank. Thus, the switching valve has completed the entire process of switching from high-grade fuel to low-grade fuel.

[0016] In addition, to prevent fuel from condensing in the large chamber fuel outlet pipe 11 and the engine fuel inlet pipe 12, the large chamber fuel outlet pipe 11 and the engine fuel inlet pipe 12 are designed as electrically heated fuel pipes. The heating control system is linked with the electronic fuel reversing valve 3. When switching to low-grade fuel to supply the engine, the system starts heating the large chamber fuel outlet pipe 11 and the engine fuel inlet pipe 12; when switching to high-grade fuel, the heating of the large chamber fuel outlet pipe 11 and the engine fuel inlet pipe 12 stops. When the driver presses the switching switch, the valve core switches to the fuel supply channel of the large chamber 1 of the fuel tank. At the same time, the heating relay is energized, and the large chamber fuel outlet pipe 11 and the engine fuel inlet pipe 12 start working. The electronic fuel reversing valve 3 and the heating relay are directly linked. The negative terminal of the heating element is connected in parallel with the main fuel tank control line of the electronic fuel reversing valve 3, and the positive terminal is connected to the power supply through an independent fuse. In this way, a heating circuit can be formed at the same time as switching to the fuel supply position of the large chamber 1 of the fuel tank.

[0017] The working principle of the electronically controlled delayed-switching fuel supply and heating device used in this cold-region bulldozer is as follows: When using the electronically controlled delayed-switching fuel supply and heating device, firstly, low-grade diesel is added to the large chamber 1 of the fuel tank, and high-grade diesel is added to the small chamber 2 of the fuel tank. Before starting the bulldozer, ensure that the electronically controlled fuel reversing valve 3 is in the fuel supply state of the small chamber 2 of the fuel tank. After starting, the high-grade diesel in the small chamber 2 of the fuel tank enters the electronically controlled fuel reversing valve 3 through the first outlet flange 4 and the small chamber inlet pipe 8, and is then transported to the engine through the engine inlet pipe 12. The engine return fuel flows back to the small chamber 2 of the fuel tank through the engine return pipe 13, the electronically controlled fuel reversing valve 3, and the small chamber return pipe 9. When the engine is running... After a period of time, the water temperature in the engine coolant tank rises. The operator can press the switch in the cab. At this time, the electronic fuel reversing valve 3 is energized and drives the oil inlet valve core to rotate 90 degrees within 150ms, opening the oil supply channel of the large chamber 1 of the fuel tank and closing the oil supply channel of the small chamber 2 of the fuel tank. At the same time, the heating control system linked with the electronic fuel reversing valve 3 is activated to heat the large chamber oil outlet pipe 11 and the engine oil inlet pipe 12. The low-grade diesel fuel in the large chamber 1 of the fuel tank is preheated by the residual heat of the engine coolant under the action of the heat exchanger 503 (the engine coolant enters the heat exchanger 503 through the fuel heating water inlet pipe 14 and the fuel heating water inlet 501 of the second oil outlet flange 5 for heat exchange). Afterwards, the fuel flows back to the engine coolant tank via the fuel heating return port 502 and fuel heating return pipe 15. The preheated low-grade diesel fuel enters the electronic fuel reversing valve 3 via the second oil outlet flange 5 and the large-cavity oil outlet pipe 11, and is then delivered to the engine via the engine inlet pipe 12. After a set delay to ensure that the high-grade diesel fuel remaining in the pipeline has completely returned, the electronic fuel reversing valve 3 drives the return oil channel valve core to rotate 90 degrees, opening the return oil channel of the large chamber 1 of the fuel tank and closing the return oil channel of the small chamber 2 of the fuel tank. The engine return oil flows back to the large chamber 1 of the fuel tank via the engine return oil pipe 13, the electronic fuel reversing valve 3, and the large-cavity return oil pipe 10. During use, the fuel can be discharged through the first fuel tank drain valve via the first oil outlet flange 4. Water outlet 6 and the second oil tank drain outlet 7 of the second oil outlet flange 5 drain water from the oil tank. When the vehicle stops, the electronic fuel reversing valve 3 is forced to reset the two valve cores after power failure detection, restoring them to the fuel supply state of the small chamber 2 of the oil tank, so as to ensure smooth start-up in low-temperature environments. If manual control is required, the manual control mode can be switched through the mode selection in the cab. The two valve cores can be directly controlled by the button to complete the switching. In automatic control mode, the two valve cores are synchronously controlled by power-on delay. The heating circuit achieves linkage control through valve core status detection (both valve cores are in the corresponding fuel supply state of the large chamber 1 of the oil tank). At the same time, the device has a filter circuit, protection circuit, overheat protection and emergency stop function to ensure safe operation.

[0018] Obviously, the above embodiments are merely illustrative examples for clear explanation and are not intended to limit the implementation. Those skilled in the art can make other variations or modifications based on the above description. It is neither necessary nor possible to exhaustively list all possible implementations here. However, obvious variations or modifications derived therefrom are still within the protection scope of this invention.

Claims

1. An electronically controlled time-delay switching fuel supply and heating device for bulldozers in cold regions, including a fuel tank structure (17), characterized in that: All fuel tank structures (17) are fixedly equipped with partitions (16), which divide the fuel tank structure (17) into two independent spaces: a large fuel tank chamber (1) and a small fuel tank chamber (2). An electronically controlled fuel reversing valve (3) is fixedly installed at the lower end of the fuel tank structure (17). A first fuel outlet flange (4) is fixedly installed on the lower side wall of the small fuel tank chamber (2), and the first fuel outlet flange (4) is connected to the electronically controlled fuel reversing valve (3) via a small chamber inlet pipe (8). A second fuel outlet flange (5) is fixedly installed on the lower side wall of the large fuel tank chamber (1), and the second fuel outlet flange (5) is connected to the electronically controlled fuel reversing valve (3) via a large chamber outlet pipe (11). The electronically controlled fuel reversing valve (3) is connected to the small chamber (2) of the fuel tank through the small chamber return oil pipe (9). The electronically controlled fuel reversing valve (3) is connected to the large chamber (1) of the fuel tank through the large chamber return oil pipe (10). The electronically controlled fuel reversing valve (3) is connected to the engine through the engine inlet oil pipe (12) and the engine return oil pipe (13). The second oil outlet flange (5) is connected to the engine coolant tank through the fuel heating water inlet pipe (14) and the fuel heating water return pipe (15). The second oil outlet flange (5) includes a heat exchanger (503). The heat exchanger (503) is located in the large chamber (1) of the fuel tank. The large chamber oil outlet pipe (11) and the engine inlet oil pipe (12) are electrically heated oil pipes.

2. The electronically controlled time-delay switching fuel supply and heating device for bulldozers in cold regions according to claim 1, characterized in that: The electronically controlled fuel reversing valve (3) is electrically connected to the switch in the cab, and the heating control system of the large-cavity oil outlet pipe (11) and the engine oil inlet pipe (12) is linked with the electronically controlled fuel reversing valve (3).

3. The electronically controlled time-delay switching fuel supply and heating device for bulldozers in cold regions according to claim 2, characterized in that: The first oil outlet flange (4) is provided with a first oil tank drain port (6).

4. The electronically controlled time-delay switching fuel supply and heating device for bulldozers in cold regions according to claim 3, characterized in that: The second oil outlet flange (5) is provided with a second oil tank drain port (7).

5. The electronically controlled time-delay switching fuel supply and heating device for bulldozers in cold regions according to claim 4, characterized in that: The second oil outlet flange (5) is provided with a fuel heating water inlet (501) and a fuel heating water return outlet (502). The fuel heating water inlet (501) is connected to the engine coolant tank through a fuel heating water inlet pipe (14), and the fuel heating water return outlet (502) is connected to the engine coolant tank through a fuel heating water return pipe (15).

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