A fuel filter

Abstract

The utility model relates to a kind of fuel filters, comprising: plastic base, oil inlet and oil outlet are equipped on plastic base, metal framework is embedded in the inside of plastic base;Check valve, be located on plastic base, for the first flow cavity and second flow cavity are separated by flowing cavity;Plastic water cup, be located on plastic base, inside assembly has filter core;Fuel pump, be located on plastic base, oil inlet is communicated with the first flow cavity;Plastic plug, be located on plastic base, for check valve spacing.Compared with prior art, the utility model has lightweight and low cost, corrosion resistance and cleanliness are improved, structure is reliable, and it is easy to install and the like.

Description

Technical Field

[0001] This utility model relates to the field of filter technology, and in particular to a fuel filter. Background Technology

[0002] As national emission standards for automobile engines become more stringent, fuel filters require continuous improvement and upgrades. The primary function of a fuel filter is to filter fuel and remove water from diesel fuel. Filtered fuel significantly reduces the probability of injector failure and extends engine life. Current filter bases and one-way valves are all metal, resulting in heavy weight, high cost, poor corrosion resistance, and more complex manufacturing processes.

[0003] CN201822141921.6 discloses a plastic fuel filter, including a filter seat, a filter canister, and a lower cover, all made of plastic. It also includes a heater connector, a vent screw, an oil temperature sensor with a plastic housing, and a hand pump assembly made of plastic. The heater connector includes an electrical connector and a plastic housing, with the plastic housing covering the electrical connector. The plastic housing is welded to the plastic filter seat, and the electrical connector is soldered to the built-in electric heater of the plastic fuel filter. The vent screw is threaded to the filter seat. The plastic housing of the oil temperature sensor is welded to the filter seat. A guide post is provided on the filter seat, and the hand pump assembly is installed in a hand pump positioning hole provided in the guide post. However, the one-way valve is a traditional spring valve structure. Although the main body is made of plastic, the hand pump assembly contains a metal spring, limiting its weight reduction. Utility Model Content

[0004] The purpose of this utility model is to overcome the defects of the existing technology and provide a fuel filter that is lightweight and low-cost, has improved corrosion resistance and cleanliness, reliable structure, and is easy to install.

[0005] The objective of this utility model can be achieved through the following technical solutions:

[0006] This utility model provides a fuel filter, comprising:

[0007] The plastic base has an oil inlet and an oil outlet, and a metal frame is embedded inside the plastic base.

[0008] A one-way valve, mounted on a plastic base, is used to divide the flow chamber into a first flow chamber and a second flow chamber;

[0009] A plastic water cup, mounted on a plastic base, with a filter cartridge installed inside;

[0010] The fuel pump is mounted on a plastic base, and its inlet is connected to the first flow chamber.

[0011] A plastic plug, located on a plastic base, is used to limit the movement of the one-way valve.

[0012] Furthermore, the metal skeleton in the plastic base is embedded into the plastic base by injection molding.

[0013] Furthermore, the one-way valve is a diaphragm-type plastic one-way valve.

[0014] Furthermore, the one-way valve includes a one-way valve disc, a valve seat, and a sealing ring; the one-way valve disc and the sealing ring are mounted on the valve seat, and the valve seat is mounted on a plastic base.

[0015] Furthermore, the one-way valve plate is in the shape of a circular diaphragm, and the edge of the one-way valve plate and the contact surface with the valve seat form a conical sealing surface to ensure no fuel leakage when closed; the center of the valve seat is provided with a fuel through hole, and the diameter of the fuel through hole matches the diameter of the one-way valve plate.

[0016] Furthermore, the plastic cup is threadedly connected to the plastic base.

[0017] Furthermore, the plastic plug is threadedly connected to the plastic base.

[0018] Furthermore, the plastic plug is provided with a plug sealing ring.

[0019] Furthermore, the fuel pump is an electric pump.

[0020] Furthermore, the metal frame is provided with multiple hollow holes to achieve lightweighting.

[0021] The working principle is as follows:

[0022] 1. Start-up Phase

[0023] When the fuel pump is powered on and started, the pressure in the fuel pump inlet is negative, making the pressure in the first flow chamber lower than that in the second flow chamber. This causes the one-way valve to be closed. A sealing ring between the one-way valve and the plastic base ensures a sealed connection, preventing fuel from entering the second flow chamber. The fuel enters the filter element from the fuel tank through the inlet, is filtered, passes through the first flow chamber, then through the fuel pump, and finally exits from the outlet to enter the next stage.

[0024] 2. Normal operation phase

[0025] When the fuel pump is de-energized, the low-pressure pump at the rear starts. The fuel in the first flow chamber pushes the one-way valve, causing the one-way valve plate to open automatically due to the pressure difference. The fuel in the first flow chamber passes directly through the one-way valve into the second flow chamber. The filtered fuel is continuously supplied to the engine through the fuel outlet, allowing the engine to work normally.

[0026] Compared with the prior art, the present invention has the following advantages:

[0027] (1) Lightweight and low cost. The plastic base replaces the traditional metal base, and the metal frame is injection molded with inserts, which reduces the overall weight and material costs. The filter element can be replaced independently, and the base and water cup can be reused, reducing maintenance costs.

[0028] (2) Improved corrosion resistance and cleanliness. The plastic base, water cup and one-way valve are made of plastic, which solves the problem of metal parts corrosion, avoids metal processing debris from contaminating the fuel system, and significantly improves cleanliness.

[0029] (3) Reliable structure and easy installation. The diaphragm-type plastic check valve does not require a traditional metal spring, has stronger sealing performance, and prevents fuel leakage; it is directly inserted into the plastic base during installation. Attached Figure Description

[0030] Figure 1 This is a cross-sectional view of a fuel filter;

[0031] Figure 2 This is a schematic diagram of the structure of a fuel filter;

[0032] Figure 3 This is an isometric view of a fuel filter.

[0033] Figure 4 A schematic diagram showing the fuel pump being turned on and the check valve being closed when the fuel filter is in operation;

[0034] Figure 5 A schematic diagram showing the fuel filter, fuel pump closed, and check valve open;

[0035] Figure 6 This is a schematic diagram of a one-way valve.

[0036] Figure 7 This is a schematic diagram of the valve seat structure;

[0037] Figure 8 This is a schematic diagram of the structure of a one-way valve plate;

[0038] Figure 9 This is a schematic diagram of the metal skeleton structure;

[0039] Figure 10 This is a schematic diagram of the structure of a plastic plug.

[0040] Reference numerals: 1-Plastic base; 2-Metal frame; 3-One-way valve; 4-Plastic water cup; 5-Filter element; 6-Fuel pump; 7-Plastic plug; 8-Fuel inlet; 9-Fuel outlet; 10-Plug sealing ring; 31-One-way valve plate; 32-Valve seat; 33-Sealing ring. Detailed Implementation

[0041] The present invention will now be described in detail with reference to the accompanying drawings and specific embodiments. Component models, material names, connection structures, control methods, algorithms, and other features not explicitly described in this technical solution are considered common technical features disclosed in the prior art.

[0042] Example 1

[0043] This embodiment provides a fuel filter, such as Figure 1-10 As shown, it includes:

[0044] Plastic base 1, with an oil inlet 8 and an oil outlet 9 on the plastic base 1, and a metal frame 2 embedded inside the plastic base 1;

[0045] A one-way valve 3, mounted on a plastic base 1, is used to divide the flow chamber into a first flow chamber and a second flow chamber.

[0046] A plastic water cup 4 is placed on a plastic base 1 and is equipped with a filter element 5 inside.

[0047] Fuel pump 6 is mounted on plastic base 1, and fuel inlet 8 is connected to the first flow chamber;

[0048] The plastic plug 7 is located on the plastic base 1 and is used to limit the movement of the one-way valve 3.

[0049] Example 2

[0050] This utility model provides a fuel filter, such as Figure 1-10 As shown, it includes:

[0051] Plastic base 1, with an oil inlet 8 and an oil outlet 9 on the plastic base 1, and a metal frame 2 embedded inside the plastic base 1;

[0052] A one-way valve 3, mounted on a plastic base 1, is used to divide the flow chamber into a first flow chamber and a second flow chamber.

[0053] A plastic water cup 4 is placed on a plastic base 1 and is equipped with a filter element 5 inside.

[0054] Fuel pump 6 is mounted on plastic base 1, and fuel inlet 8 is connected to the first flow chamber;

[0055] The plastic plug 7 is located on the plastic base 1 and is used to limit the movement of the one-way valve 3.

[0056] In a specific embodiment, the metal frame 2 in the plastic base 1 is embedded into the plastic base 1 by injection molding.

[0057] In a specific embodiment, the one-way valve 3 is a diaphragm-type plastic one-way valve.

[0058] In a specific embodiment, the one-way valve 3 includes a one-way valve plate 31, a valve seat 32, and a sealing ring 33; the one-way valve plate 31 and the sealing ring 33 are mounted on the valve seat 32, and the valve seat 32 is mounted on the plastic base 1.

[0059] In a specific embodiment, the one-way valve plate 31 is in the shape of a circular diaphragm, and the edge of the one-way valve plate 31 and the contact surface with the valve seat 32 form a conical sealing surface to ensure no fuel leakage when closed; the valve seat 32 is provided with a fuel through hole at the center, and the diameter of the fuel through hole matches the diameter of the one-way valve plate 31.

[0060] In a specific embodiment, the plastic water cup 4 is threadedly connected to the plastic base 1.

[0061] In a specific embodiment, the plastic plug 7 is threadedly connected to the plastic base 1.

[0062] In a specific embodiment, the plastic plug 7 is provided with a plug sealing ring 10.

[0063] In a specific embodiment, the fuel pump 6 is an electric pump.

[0064] In a specific embodiment, the metal frame 2 is provided with multiple hollow holes to achieve lightweighting.

[0065] The working principle is as follows:

[0066] 1. Start-up Phase

[0067] When the fuel pump 6 is powered on and started, the pressure in the fuel inlet of the fuel pump 6 is negative, which makes the pressure in the first flow chamber less than that in the second flow chamber. This causes the one-way valve 3 to be in a closed state. A sealing ring is provided between the one-way valve 3 and the plastic base 1 to ensure a sealed connection between the one-way valve 3 and the plastic base 1. Fuel in the first flow chamber will not enter the second flow chamber. After the fuel enters the filter element 5 from the fuel tank through the fuel inlet 8 and is filtered, the filtered fuel passes through the first flow chamber, then through the fuel pump 6, and finally is discharged from the fuel outlet 9 to enter the next stage.

[0068] 2. Normal operation phase

[0069] When fuel pump 6 is de-energized, the low-pressure pump at the rear is activated. Fuel in the first flow chamber pushes the one-way valve 3, causing the one-way valve plate 31 to automatically open due to the pressure difference. Fuel in the first flow chamber directly enters the second flow chamber through the one-way valve 3. The filtered fuel is continuously supplied to the engine through the fuel outlet 9, allowing the engine to operate normally.

[0070] Components not described in detail in this embodiment are all existing components that can be purchased through public channels.

[0071] The above description of the embodiments is provided to enable those skilled in the art to understand and use the utility model. It will be apparent to those skilled in the art that various modifications can be easily made to these embodiments, and the general principles described herein can be applied to other embodiments without inventive effort. Therefore, the present utility model is not limited to the above embodiments, and any improvements and modifications made by those skilled in the art based on the disclosure of the present utility model without departing from its scope should be within the protection scope of the present utility model.

Claims

1. A fuel filter, characterized in that, include: A plastic base (1) is provided with an oil inlet (8) and an oil outlet (9). A metal frame (2) is embedded inside the plastic base (1). A one-way valve (3) is provided on a plastic base (1) for dividing the flow chamber into a first flow chamber and a second flow chamber; A plastic water cup (4) is placed on a plastic base (1) and is equipped with a filter element (5) inside; A fuel pump (6) is mounted on a plastic base (1), and its inlet (8) is connected to the first flow chamber. A plastic plug (7) is placed on a plastic base (1) and is used to limit the movement of the check valve (3).

2. A fuel filter according to claim 1, characterized in that, The metal frame (2) in the plastic base (1) is embedded into the plastic base (1) by injection molding.

3. A fuel filter according to claim 1, characterized in that, The one-way valve (3) is a diaphragm-type plastic one-way valve.

4. A fuel filter according to claim 1, characterized in that, The one-way valve (3) includes a one-way valve plate (31), a valve seat (32) and a sealing ring (33); the one-way valve plate (31) and the sealing ring (33) are mounted on the valve seat (32), and the valve seat (32) is mounted on the plastic base (1).

5. A fuel filter according to claim 4, characterized in that, The one-way valve plate (31) is in the shape of a circular diaphragm. The edge of the one-way valve plate (31) and the contact surface of the valve seat (32) form a conical sealing surface to ensure that there is no fuel leakage when closed. The center of the valve seat (32) is provided with a fuel through hole, and the diameter of the fuel through hole matches the diameter of the one-way valve plate (31).

6. A fuel filter according to claim 1, characterized in that, The plastic water cup (4) is threadedly connected to the plastic base (1).

7. A fuel filter according to claim 1, characterized in that, The plastic plug (7) is threadedly connected to the plastic base (1).

8. A fuel filter according to claim 1, characterized in that, The plastic plug (7) is provided with a plug sealing ring (10).

9. A fuel filter according to claim 1, characterized in that, The fuel pump (6) is an electric pump.

10. A fuel filter according to claim 1, characterized in that, The metal frame (2) has multiple hollow holes to achieve lightweighting.

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