Segmented remote suction fuel pump assembly

Abstract

The utility model discloses a sectional type far end oil pump assembly of sucking, including oil storage bucket, oil storage bucket sets up in main oil tank, is equipped with the pump core subassembly in oil storage bucket, and the pump core subassembly includes the impeller pump and motor, and the oil inlet front end of pump core subassembly is equipped with the screen, its characterized in that: the outlet pipeline lateral branch of pump core subassembly is equipped with pressure valve, and the pressure relief outlet of pressure valve is connected with the injection pipe, and the injection pipe is fixed by the pump support, and the injection pipe tail end is equipped with the taper nozzle structure, is used for generating the negative pressure area through high -speed fuel, and the negative pressure area of injection pipe is linked with the oil suction pipe one end, and the oil suction pipe other end is through the bellows flexible connection to the auxiliary oil tank bottom, the utility model discloses structure simplification and cost reduction: cancel the auxiliary oil tank independent pump body, and drive injection oil sucking through the main pump pressure relief energy, reduce the component quantity and trouble point.

Description

Technical Field

[0001] This utility model relates to an improved invention of a fuel pump, and more particularly to an improved invention of a segmented remote air-suction fuel pump assembly. Background Technology

[0002] In existing fuel supply systems, if a vehicle or equipment is equipped with a main fuel tank and an auxiliary fuel tank, a fuel pump is typically installed in the main fuel tank, and an auxiliary pump or mechanical fuel suction device is installed in the auxiliary fuel tank to achieve bidirectional fuel supply. However, this design has the following drawbacks: 1. Complex structure and high cost: The auxiliary oil tank requires an independent pump body, which leads to redundant components, difficult installation and maintenance, and increased manufacturing costs; 2. Low pressure regulation efficiency: Traditional fuel pumps rely on a single pressure valve to release pressure. After the pressure is released, the fuel flows directly back to the fuel tank. The pressure release energy cannot be used to assist in fuel suction, resulting in low fuel transfer efficiency. 3. Insufficient fuel suction capacity at the remote end: The fuel in the auxiliary fuel tank needs to be delivered by gravity or a mechanical pump. When the height difference between the fuel tanks is large or the fuel level is low, fuel suction may be interrupted, affecting the stable operation of the engine. 4. Installation defects of traditional ejector oil suction assemblies: - High assembly precision requirements: The ejector assembly is usually pressed into the oil reservoir mounting hole by interference fit. The tolerance of the hole diameter and the pipe diameter must be strictly controlled, otherwise it will easily lead to seal failure. - Poor vibration resistance: The difference in materials between the oil tank and the ejector tube makes them prone to vibration fatigue. Micro gaps may appear at the interference fit interface, which may cause fuel leakage. - Difficult to maintain: The ejector tube and the oil tank are rigidly connected. If damaged, the entire oil tank assembly needs to be replaced, resulting in high maintenance costs.

[0003] Based on the above problems, this utility model proposes an integrated fuel pump assembly that integrates main pump oil suction, pressure relief regulation and ejector vacuum oil suction. By optimizing the synergistic effect of the pressure valve and ejector tube, and combining it with a segmented modular design, it achieves efficient fuel supply to the main fuel tank and the remote auxiliary fuel tank. Utility Model Content

[0004] The technical problem to be solved by this utility model is to overcome the shortcomings of the prior art and provide a segmented remote air-suction fuel pump assembly.

[0005] To solve the above-mentioned technical problems, this utility model adopts the following technical solution: This segmented remote air-suction fuel pump assembly includes a fuel tank, which is located inside the main fuel tank. A pump core assembly is installed inside the fuel tank. The pump core assembly includes an impeller pump and a motor. A filter screen is provided at the front end of the fuel inlet of the pump core assembly. The characteristic feature is that a pressure valve is provided on the lateral branch of the outlet pipe of the pump core assembly. The pressure relief outlet of the pressure valve is connected to an ejector tube. The ejector tube is fixed by a pump bracket. The end of the ejector tube is provided with a tapered nozzle structure for generating a negative pressure zone through high-speed fuel. The negative pressure zone of the ejector tube is connected to one end of the fuel suction pipe. The other end of the fuel suction pipe is flexibly connected to the bottom of the auxiliary fuel tank through a corrugated pipe.

[0006] The ejector tube is fixed above the pump bracket by laser welding, and the weld between the ejector tube and the pump bracket is located in a non-pressure-bearing area.

[0007] The converging nozzle structure has a contraction angle of 15°–20° and a length-to-diameter ratio of 3:1.

[0008] The corrugated pipe is made of fluororubber and its axial expansion and contraction is ≥5mm.

[0009] The pump core assembly is vertically mounted at the bottom of the main oil tank.

[0010] The pump bracket is connected and fixed to the oil storage tank by a snap fastener.

[0011] The beneficial effects of this utility model are: 1. Simplified structure and reduced cost: The independent pump body of the auxiliary fuel tank is eliminated, and the fuel is driven by the depressurization energy of the main pump, which reduces the number of parts and failure points; 2. High-efficiency pressure regulation and energy utilization: Depressurized fuel forms a vacuum through the injector, enabling secondary utilization of fuel energy and improving system efficiency; 3. Stable remote oil suction capability: The ejector vacuum oil suction is not limited by the height difference of the oil tank, ensuring continuous oil supply from the auxiliary oil tank under low oil volume or complex working conditions; 4. Vibration resistance and sealing optimization: The bellows connection design effectively absorbs vibration, prevents pipeline leakage, and extends the service life of the assembly; 5. Advantages of segmented modular design: - No need to rely on the structural precision of the oil storage tank; - Connection reliability: Laser welding process eliminates the tolerance dependence of interference fit, ensuring the sealing and vibration resistance of ejector tube and pump bracket. Attached Figure Description

[0012] The specific embodiments of this utility model will be further described in detail below with reference to the accompanying drawings.

[0013] Figure 1This is a schematic diagram of the structure of this utility model.

[0014] Figure 2 This is a cross-sectional view of the structure of this utility model. Detailed Implementation

[0015] The accompanying drawings illustrate the structure of this utility model, and further details will be described below with reference to the drawings. In this embodiment, see the attached drawings. Figure 1-2 This segmented remote-suction fuel pump assembly includes a fuel reservoir 1, which is located inside the main fuel tank. The fuel reservoir 1 contains a pump core assembly 2, which includes an impeller pump and a motor for pressurizing and delivering fuel to the engine. A filter screen 3 is located at the front end of the pump core assembly 2's suction port to filter fuel impurities. A pressure valve 4 is located on a lateral branch of the pump core assembly 2's outlet pipe, allowing for dynamic adjustment of system pressure. When the fuel pressure reaches a preset threshold, it automatically releases pressure. The pressure release outlet of the pressure valve 4 is connected to an ejector tube 5, which is fixed by a pump bracket 6. The ejector tube 5 has a tapered nozzle structure 7 at its end, used to generate a negative pressure zone through high-speed fuel. The negative pressure zone of the ejector tube 5 is connected to one end of a suction pipe 8. The other end of the suction pipe 8 is flexibly connected to the bottom of the auxiliary fuel tank via a corrugated pipe. The corrugated pipe has vibration-resistant and sealing functions, ensuring a reliable connection between the suction pipe 8 and the auxiliary fuel tank.

[0016] The working principle of this utility model 1. Main pump oil suction stage: - After the pump core assembly 2 is powered on, the impeller pump starts, and fuel is drawn from the main fuel tank after being filtered by the filter screen 3 and pressurized and delivered to the engine fuel supply line; 2. Depressurization and ejection vacuum formation stage: - When the system pressure exceeds the set value (e.g., 0.5MPa), the pressure valve 4 opens, and some high-pressure fuel enters the injector tube 5 through the pressure relief port; - The tapered nozzle structure 7 of the ejector tube 5 causes a sharp increase in fuel flow rate. According to Bernoulli's principle, high-speed fuel creates a local vacuum zone at the outlet of the ejector tube 5. 3. Oil suction stage of the remote auxiliary fuel tank: - One end of the fuel suction pipe 8 is connected to the vacuum zone of the ejector pipe 5, and the other end is connected to the bottom of the auxiliary fuel tank via a bellows. Under the action of vacuum suction, fuel from the auxiliary fuel tank is continuously drawn into the ejector pipe 5, mixed with the depressurized fuel, and then delivered to the engine together, realizing synchronous fuel supply from both fuel tanks.

[0017] As a further improved specific implementation, the ejector tube 5 is fixed above the pump bracket 6 by laser welding process, and the weld seam between the ejector tube 5 and the pump bracket 6 is located in a non-pressure-bearing area, eliminating the tolerance dependence of interference fit, ensuring the sealing and vibration resistance of the ejector tube 5 and the pump bracket 6, and reducing the risk of leakage.

[0018] As a further improved specific implementation, the contraction angle of the tapered nozzle structure 7 is 15°–20°, and the length-to-diameter ratio is 3:1, which is used to optimize the relationship between fuel flow rate and vacuum.

[0019] As a further improved embodiment, the bellows is made of fluororubber and has an axial expansion and contraction of ≥5mm, which is used to absorb vibration displacement between oil tanks.

[0020] As a further improved implementation, the pump core assembly 2 is vertically installed at the bottom of the main oil tank to ensure the oil suction effect.

[0021] As a further improved implementation, the pump bracket 6 is connected and fixed to the oil storage tank 1 by a snap fastener, achieving a detachable and quick connection.

[0022] In summary, the above are merely preferred embodiments of this utility model and are not intended to limit the scope of protection of this utility model. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this utility model should be included within the scope of protection of this utility model.

Claims

1. A segmented remote-suction fuel pump assembly, comprising a fuel reservoir disposed within a main fuel tank, a pump core assembly comprising an impeller pump and a motor, and a filter screen disposed at the front end of the fuel inlet of the pump core assembly, characterized in that: A pressure valve is provided on the lateral branch of the outlet pipe of the pump core assembly. The pressure relief outlet of the pressure valve is connected to an ejector tube, which is fixed by the pump bracket. The end of the ejector tube is provided with a tapered nozzle structure, which is used to generate a negative pressure zone through high-speed fuel. The negative pressure zone of the ejector tube is connected to one end of the fuel suction pipe, and the other end of the fuel suction pipe is flexibly connected to the bottom of the auxiliary fuel tank through a corrugated pipe.

2. The segmented remote air-suction fuel pump assembly as described in claim 1, characterized in that: The ejector tube is fixed above the pump bracket by laser welding, and the weld between the ejector tube and the pump bracket is located in a non-pressure-bearing area.

3. The segmented remote air-suction fuel pump assembly as described in claim 1, characterized in that: The converging nozzle structure has a contraction angle of 15°–20° and a length-to-diameter ratio of 3:

1.

4. The segmented remote air-suction fuel pump assembly as described in claim 1, characterized in that: The corrugated pipe is made of fluororubber and its axial expansion and contraction is ≥5mm.

5. The segmented remote air-suction fuel pump assembly as described in claim 1, characterized in that: The pump core assembly is vertically mounted at the bottom of the main oil tank.

6. The segmented remote air-suction fuel pump assembly as described in claim 1, characterized in that: The pump bracket is connected and fixed to the oil storage tank by a snap fastener.

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