Maintenance-free long-storage-resistant fuel oil device

Abstract

The invention discloses a maintenance-free long-storage-resistant fuel oil device which comprises a fuel oil tank, an oil collecting tank, an expansion tank, an anti-bubble oil tank, a temperature and pressure sensor, a fuel oil pump, an oil passing electric explosion valve, a ventilation electric explosion valve, a controller and a one-way valve. An oil collecting tank is arranged in the fuel tank; an oil suction header pipe is arranged in the oil collecting tank, extends out of the fuel tank from the oil collecting tank and is connected with an inlet of a fuel pump; an outlet of the fuel pump is connected to the anti-bubble oil tank through a temperature and pressure sensor by a pipeline; the anti-bubble oil tank is connected with one end of the oil-through electric explosion valve through a pipeline, and the other end of the oil-through electric explosion valve is connected with an oil supply inlet of the engine; an expansion tank is arranged at the top of the fuel tank; the expansion tank is connected with the fuel tank through a pipeline; a ventilation pipeline is reserved at the top of the expansion box and extends out of the expansion box to be connected with a ventilation electric explosion valve. The quality guarantee that fuel oil is stored for more than ten years can be met, the reliability of flight power is effectively improved in the using process, and the maneuvering overload range of an aircraft is widened.

Description

Technical Field

[0001] This invention belongs to the field of fuel storage technology, specifically relating to a maintenance-free, long-term fuel storage device. Background Technology

[0002] Currently, traditional fuel systems generally suffer from the following technical bottlenecks: 1. Insufficient sealing reliability: Using a single sealing ring or threaded seal, long-term storage can easily lead to material aging, resulting in seal failure and fuel leakage.

[0003] 2. High maintenance requirements: It requires regular inspection of seals and cleaning of impurities, and is not suitable for long-term storage scenarios and requirements.

[0004] 3. Insufficient fuel supply stability: Traditional fuel tanks are prone to generating eddy bubbles during fuel extraction, or under large overload and large posture conditions, which can affect the operation of equipment or engine, and may even cause the engine to stall.

[0005] Fuel systems used in the automotive and aerospace industries do not require sealing, but regular inspection and maintenance are necessary during use. However, fuel systems for special applications require long shelf lives, maintenance-free operation, and reliable reuse. They must provide reliable fuel supply under various maneuvering and overload conditions, be maintenance-free for storage within a range of -40°C to 50°C, and even 70°C, and be ready for immediate use with intact fuel tank structure, functional components, and high-quality fuel. Therefore, there is an urgent need for a fuel system design that combines high sealing performance, long shelf life, maintenance-free operation, and reliable fuel supply. Summary of the Invention

[0006] To overcome the shortcomings of existing technologies, this invention provides a maintenance-free, long-term fuel storage device, comprising a fuel tank, a collection tank, an expansion tank, an anti-bubble fuel tank, a temperature and pressure sensor, a fuel pump, an electric fuel detonating valve, an electric venting valve, a controller, and a check valve. The collection tank is located within the fuel tank. The collection tank contains a main suction pipe that extends from the collection tank and connects to the fuel pump inlet. The fuel pump outlet is connected to the anti-bubble fuel tank via a pipeline through the temperature and pressure sensor. The anti-bubble fuel tank is connected to one end of the electric fuel detonating valve via a pipeline, and the other end of the electric fuel detonating valve is connected to the engine fuel supply inlet. An expansion tank is located on top of the fuel tank. The expansion tank is connected to the fuel tank via a pipeline. A venting pipeline is pre-installed on the top of the expansion tank, extending to the outside of the expansion tank and connecting to the electric venting valve. The controller is connected to the fuel pump, temperature and pressure sensor, electric fuel detonating valve, and electric venting valve via cables. This invention can guarantee fuel quality for storage for more than ten years, effectively improves the reliability of flight power during use, and broadens the aircraft's maneuverability overload range.

[0007] The technical solution adopted by this invention to solve its technical problem is as follows: A maintenance-free, long-term fuel storage device includes a fuel tank, a collection tank, an expansion tank, an anti-bubble fuel tank, a temperature and pressure sensor, a fuel pump, an oil-feeding electro-explosive valve, a venting electro-explosive valve, a controller, and a check valve. The fuel tank is equipped with a fuel collection tank; the fuel collection tank contains a fuel suction main pipe, which extends from the fuel collection tank and connects to the fuel pump inlet; the fuel pump outlet is connected to the anti-bubble fuel tank via a pipeline through a temperature and pressure sensor. The anti-bubble oil tank is connected to one end of the oil supply electro-explosive valve via a pipeline, and the other end of the oil supply electro-explosive valve is connected to the engine oil supply inlet. An expansion tank is installed on the top of the fuel tank; the expansion tank is connected to the fuel tank via a pipeline; a venting pipeline is reserved on the top of the expansion tank, and the venting pipeline extends to the outside of the expansion tank and connects to the venting electric explosion valve; The controller is connected to the fuel pump, temperature and pressure sensor, fuel supply electro-explosive valve, and vent electro-explosive valve via cables; the controller collects fuel output temperature and pressure in real time and controls the fuel pump speed to output fuel to the engine. The expansion tank is equipped with a one-way valve as a nitrogen charging inlet.

[0008] Preferably, the fuel tank has a fully sealed structure with a double-layer sealing design. The connection between the fuel tank body, tank cover, ribs, and pipelines adopts an inner and outer stepped fit, and the inner and outer overlapping surfaces are formed by laser welding or argon arc welding to form a permanent sealing layer; the fuel tank body is made of stainless steel.

[0009] Preferably, the oil collection tank is an integral structure; the oil collection tank is located at the bottom of the fuel tank body, the bottom of the oil collection tank is connected to the fuel tank body, and two small holes with a diameter of 2mm are reserved on the upper wall of the oil collection tank body.

[0010] Preferably, the oil collection tank is used as follows: When refueling, fuel enters the fuel tank from the bottom, and gas overflows from the small hole; During operation, the fuel in the fuel tank will sway up and down and back and forth due to random overload. The fuel collection tank is full, maintaining fuel stability, and the fuel suction pipe inside the fuel collection tank maintains a continuous fuel supply. When the fuel level in the fuel collection tank decreases, the internal structure becomes fuel at the top and gas at the bottom. At this time, the fuel suction pipe will move in the same direction as the fuel with positive and negative overload, thus ensuring that fuel continues to enter the fuel suction pipe smoothly. When the fuel system returns to a horizontal positive overload, the fuel collection tank enters normal operating conditions. Fuel enters the fuel collection tank from the bottom, and the gas inside the fuel collection tank overflows to the outside of the fuel collection tank through the small hole at the top, and the fuel collection tank returns to a full state.

[0011] Preferably, the volume of the expansion tank is more than 7% of the volume of the fuel tank.

[0012] Preferably, the fuel tank has a filling port on its side, which leads to the inside of the fuel collection tank via a pipeline; the fuel tank has a vent on its side or top, with the outlet of the vent's internal pipeline located inside the fuel tank. When refueling, the fuel level reaches the outlet of the vent's internal pipeline, causing fuel to overflow, thus filling the tank to its maximum full capacity; both the filling port and the vent are one-way valves to ensure a sealed state after refueling.

[0013] Preferably, the controller collects the pressure and temperature of the output fuel in real time. When the flight speed increases, the fuel flow rate increases. Based on the fuel pressure demand, the speed of the fuel pump is adjusted to increase the fuel pressure and fuel flow rate, thereby improving the engine thrust.

[0014] Preferably, the fuel oil is dehydrated and deoxygenated kerosene.

[0015] Preferably, both the oil-operated and air-operated electric explosion valves are diaphragm-type electric explosion valves.

[0016] The beneficial effects of this invention are as follows: This invention can be applied in various fields. In aircraft applications, it enables long-term storage, avoiding the maintenance costs and leakage risks of traditional fuel tanks. Simultaneously, it ensures reliable fuel supply to the engine during operation, adapting to the aircraft's large-scale maneuvers and ensuring normal engine operation, thus improving the aircraft's operational environment and maneuverability. In emergency equipment, it can serve as a backup fuel tank for firefighting and medical emergency equipment, ensuring reliable fuel supply in emergencies. In the civilian sector, it can be used in garden machinery and small power equipment, simplifying operation procedures and reducing user difficulty. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the fuel device structure of the present invention.

[0018] Figure 2 The effect of the fuel device of the present invention Figure 1 .

[0019] Figure 3 The effect of the fuel device of the present invention Figure 2 .

[0020] Figure 4 The effect of the fuel device of the present invention Figure 3 .

[0021] Figure 5 This is a schematic diagram of the fuel collection tank of the fuel device of the present invention.

[0022] Figure 6 This is a cross-sectional view of the anti-bubble fuel tank of the fuel device of the present invention.

[0023] Attached reference numerals: 1. Fuel tank; 2. Oil collection tank; 3. Fuel pump; 4. Temperature and pressure sensor; 5. Anti-bubble fuel tank; 6. Controller; 7. Fuel supply electric explosion valve; 8. Air supply electric explosion valve; 9. Expansion tank; 10. One-way valve; 11. Filling port; 12. Air vent. Detailed Implementation

[0024] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0025] The present invention aims to provide a fully sealed, long-term storage, maintenance-free, reliable, and stable fuel supply device, solving the problems of sealing failure, cumbersome maintenance, and unstable fuel supply in the prior art.

[0026] like Figure 1 As shown, the fuel tank of this invention features a fully sealed structure. The fully sealed tank body employs a double-layer sealing design. The tank body, lid, ribs, and pipe connections utilize an inner and outer stepped fit. The inner and outer overlapping surfaces are welded using laser welding or argon arc welding to form a permanent sealing layer. Double-sided welding ensures a double-layer seal, achieving leak-free operation during long-term storage (>10 years). In terms of material selection, the tank body uses corrosion-resistant stainless steel to ensure compatibility between the tank structure and the fuel, guaranteeing that the fuel will not undergo chemical reactions or deteriorate over a long period.

[0027] This invention relates to an anti-bubble fuel supply device designed within the fuel supply pipeline. The design principle of the anti-bubble fuel supply device is based on the separation of gas and liquid due to their different specific gravities. When air bubbles are drawn into the pipeline, the gas flows into the top of the anti-bubble fuel tank, while the liquid flows into the bottom. Therefore, the fuel inlet pipe of the anti-bubble fuel tank is designed at the top of the tank, and the suction port extends to the bottom of the tank. When the fuel system encounters multiple large-scale maneuvers during operation, fuel bubbles will be drawn into the pipeline. When these bubbles enter the anti-bubble fuel supply device, they are held at the top of the fuel supply tank, and the suction pipe draws fuel from the bottom of the tank into the engine. Therefore, the anti-bubble fuel supply device ensures that the fuel entering the engine is bubble-free within a certain period of time.

[0028] The expansion tank is designed above the main fuel tank to compensate for fuel volume changes caused by variations in ambient temperature and to mitigate overpressure ranges in the fuel tank. The expansion tank volume is calculated to be at least 7% of the fuel tank's total volume. Simultaneously, the structural strength of the tank must be checked to account for changes in the liquid and gas expansion space within the fuel tank after temperature variations.

[0029] The fuel filler port and vent of the fuel system can be designed as a straight-through structure or a one-way valve structure. The one-way valve structure facilitates fuel filling while ensuring the fuel tank is sealed and that nitrogen protection for the fuel tank is maintained during filling.

[0030] The fuel system uses dehydrated and deoxygenated kerosene for refueling, and nitrogen protection is applied after refueling. This system ensures that the fuel does not deteriorate during long-term storage, guaranteeing a reliable and stable supply of fuel to meet the engine's requirements during flight operations.

[0031] Example: Reference Figures 2-6 This invention designs a fuel system. The fuel tank has a circular structure, and the tank body is welded from thin-walled stainless steel plate. The entire system includes a fuel tank 1, a fuel collection tank 2, a fuel pump 3, a temperature and pressure sensor 4, an anti-bubble fuel tank 5, a controller 6, a fuel supply electro-explosive valve 7, a venting electro-explosive valve 8, an expansion tank 9, a one-way valve 10, and other components. The fuel system is in a sealed state, and the flow is maintained by the switching of the fuel supply electro-explosive valve and the venting electro-explosive valve. The fuel system has a filler port and a vent port, and a one-way valve is located at the front end of the expansion tank.

[0032] The fuel tank is used to store fuel. There are two expansion tanks: a first expansion tank and a second expansion tank. The expansion tanks are located at the top of the fuel tank body and are connected to each other via pipes. The connection is as follows: the fuel tank is connected to the first expansion tank, with one end of the pipe leading to the top of the fuel tank and the other end to the bottom of the first expansion tank. The second expansion tank is connected to the first expansion tank via a pipe, with one end of the pipe leading to the top of the first expansion tank and the other end to the bottom of the second expansion tank. When the fuel tank is full, as the ambient temperature increases, the fuel density decreases and its volume increases, causing it to flow into the first expansion tank and then into the second expansion tank. As the ambient temperature decreases, the fuel density increases and its volume decreases, causing fuel to flow from the second expansion tank into the first expansion tank and then back into the fuel tank. This process ensures the fuel tank remains sealed and prevents damage due to increased pressure.

[0033] The fuel collection tank is located at the bottom of the fuel tank. Two 2mm diameter holes are made on the upper surface of the tank to ensure that the tank is entirely filled with fuel, and allow gas to escape. A filter screen is designed on the lower surface of the tank to ensure that the fuel entering the tank is clean; this is the first stage of filtration in the fuel system. The main fuel suction pipe is located inside the tank. The main suction pipe can be designed as a fixed suction pipe or a universal suction device.

[0034] The fuel pump is installed on the line leading from the fuel tank, and the pump outlet connects to the anti-effervescent fuel tank. The anti-effervescent fuel tank is designed with a cylindrical structure. The inlet pipe of the anti-effervescent fuel tank connects to the upper surface of the tank, and the outlet pipe extends to the bottom. A second filter can be designed at the outlet of the inlet pipe of the anti-effervescent fuel tank, providing dual treatment for the fuel cleanliness of the fuel system.

[0035] The temperature and pressure sensor in the fuel system can be installed in the fuel pump line or designed together with the anti-bubble fuel tank, with the sensor installed on the side wall of the anti-bubble fuel tank.

[0036] Both the fuel-flow and vent-flow electro-explosive valves are designed as diaphragm-type electro-explosive valves. Before operation, fuel seals the fuel tank through a diaphragm. Upon receiving an opening command, an electrical signal activates the pusher, which cuts open the diaphragm opening, thus opening the valve passage. Fuel is then supplied to the engine, and atmospheric air enters the fuel tank.

[0037] One end of the vent pipe is connected to the venting electric explosion valve, and the other end extends into the top of the second expansion tank. This method ensures that the gas in the tank is always kept at the top of the tank.

[0038] The second expansion tank is designed with a one-way valve as the nitrogen charging inlet for the oil tank.

[0039] Upon receiving engine commands, the controller first activates the fuel and air vent valves, monitoring the temperature and pressure of the fuel output from the fuel tank in real time. Based on the turbojet engine's fuel demand, it issues PWM commands to the fuel pump, controlling its operation and calculating the fuel output flow rate. When the fuel flow rate needs to be increased, the fuel pump speed is increased, and the post-pump pressure is increased. When the fuel flow rate needs to be decreased, the fuel pump speed is decreased, and the post-pump pressure is reduced.

[0040] The fuel filling method for the fuel system is as follows: Step 1: Replace the air in the fuel tank with high-purity nitrogen through the one-way valve of the second expansion tank.

[0041] Step 2: Add the dehydrated and deoxygenated kerosene into the fuel tank through the filling port.

[0042] Step 3: Use the fuel pump to fill the fuel lines with fuel.

[0043] Step 4: Fill the oil tank with 30kPa nitrogen gas using high-purity nitrogen gas through the one-way valve of the second expansion tank.

[0044] After the above-mentioned fuel filling, the sealed fuel tank can ensure the stability of the fuel during long-term storage and ensure that the fuel supplied to the engine by the fuel system is clean, stable and meets the requirements.

Claims

1. A maintenance-free, long-term fuel oil storage device, characterized in that, Includes fuel tank, oil collection tank, expansion tank, anti-bubble fuel tank, temperature and pressure sensor, fuel pump, fuel supply electro-explosive valve, vent electro-explosive valve, controller and check valve; The fuel tank is equipped with a fuel collection tank; the fuel collection tank contains a fuel suction main pipe, which extends from the fuel collection tank and connects to the fuel pump inlet; the fuel pump outlet is connected to the anti-bubble fuel tank via a pipeline through a temperature and pressure sensor. The anti-bubble oil tank is connected to one end of the oil supply electro-explosive valve via a pipeline, and the other end of the oil supply electro-explosive valve is connected to the engine oil supply inlet. An expansion tank is installed on the top of the fuel tank; the expansion tank is connected to the fuel tank via a pipeline; a venting pipeline is reserved on the top of the expansion tank, and the venting pipeline extends to the outside of the expansion tank and connects to the venting electric explosion valve; The controller is connected to the fuel pump, temperature and pressure sensor, fuel supply electro-explosive valve, and vent electro-explosive valve via cables; the controller collects fuel output temperature and pressure in real time and controls the fuel pump speed to output fuel to the engine. The expansion tank is equipped with a one-way valve as a nitrogen charging inlet.

2. The maintenance-free, long-term fuel oil storage device according to claim 1, characterized in that, The fuel tank has a fully sealed structure with a double-layer sealing design. The connection between the fuel tank body, lid, ribs, and pipelines adopts an inner and outer stepped fit, and the inner and outer overlapping surfaces are formed by laser welding or argon arc welding to form a permanent sealing layer; the fuel tank body is made of stainless steel.

3. The maintenance-free, long-term fuel oil storage device according to claim 1, characterized in that, The oil collection tank is an integral structure; the oil collection tank is located at the bottom of the fuel tank body, and the bottom of the oil collection tank is connected to the fuel tank body. Two small holes with a diameter of 2mm are reserved on the upper wall of the oil collection tank body.

4. The maintenance-free, long-term fuel oil storage device according to claim 1, characterized in that, The method of using the oil collection tank is as follows: When refueling, fuel enters the fuel tank from the bottom, and gas overflows from the small hole; During operation, the fuel in the fuel tank will sway up and down and back and forth due to random overload. The fuel collection tank is full, maintaining fuel stability, and the fuel suction pipe inside the fuel collection tank maintains a continuous fuel supply. When the fuel level in the fuel collection tank decreases, the internal structure becomes fuel at the top and gas at the bottom. At this time, the fuel suction pipe will move in the same direction as the fuel with positive and negative overload, thus ensuring that fuel continues to enter the fuel suction pipe smoothly. When the fuel system returns to a horizontal positive overload, the fuel collection tank enters normal operating conditions. Fuel enters the fuel collection tank from the bottom, and the gas inside the fuel collection tank overflows to the outside of the fuel collection tank through the small hole at the top, and the fuel collection tank returns to a full state.

5. The maintenance-free, long-term fuel oil storage device according to claim 1, characterized in that, The volume of the expansion tank is more than 7% of the volume of the fuel tank.

6. The maintenance-free, long-term fuel oil storage device according to claim 1, characterized in that, The fuel tank has a filling port on its side, which leads to the inside of the fuel collection tank via a pipeline. The fuel tank also has a vent on its side or top, with the outlet of the vent's internal pipeline located inside the fuel tank. When refueling, the fuel level will overflow when it reaches the outlet of the vent's internal pipeline, meaning the fuel tank is filled to its maximum capacity. Both the filling port and the vent are one-way valves to ensure a sealed state after refueling.

7. The maintenance-free, long-term fuel oil storage device according to claim 1, characterized in that, The controller collects the pressure and temperature of the output fuel in real time. When the flight speed increases, the fuel flow rate increases. Based on the fuel pressure demand, the speed of the fuel pump is adjusted to increase the fuel pressure and fuel flow rate, thereby increasing the engine thrust.

8. The maintenance-free, long-term fuel oil storage device according to claim 1, characterized in that, The fuel used is dehydrated and deoxygenated kerosene.

9. A maintenance-free, long-term fuel oil storage device according to claim 1, characterized in that, Both the oil-operated and air-operated electric explosion valves are diaphragm-type electric explosion valves.

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