A plastic shell fuel filter with high sealing property

Abstract

The utility model relates to a plastic shell fuel filter with high sealing property relates to fuel filter equipment technical field, including filter body, set up on filter body oil inlet pipe and oil outlet pipe, the connecting head matched with oil inlet pipe intercommunication, be located on the oil guide pipe of connecting head, its characterized in that: the abutment groove is set up on the oil inlet pipe end face, through abutment groove is provided with abutment sealing washer, the end face of connecting head and abutment sealing washer abutment is provided with elastic telescopic component, the connecting housing that covers elastic telescopic component is set up on the outer wall of connecting head, and connecting housing and oil inlet pipe are connected through screw thread, and the stop component is set up on oil inlet pipe, the utility model can carry out compensation sealing to abutment sealing washer through elastic telescopic component, and elastic telescopic component can automatically adjust according to the abrasion condition, compensate the abrasion of sealing washer, ensure always keep good sealing effect.

Description

Technical Field

[0001] This application relates to the field of fuel filtration equipment technology, and in particular to a fuel filter with a high sealing performance and a plastic housing. Background Technology

[0002] The fuel filter is an important component of a car's fuel system. Its main function is to filter out dust, metal shavings, moisture, gum, and other impurities that may be present in the fuel before it enters the engine for combustion. This ensures that the fuel delivered to the engine meets the required cleanliness, reduces the risk of component failure, and extends the service life of the engine and fuel system.

[0003] In existing fuel filters, the connection to the fuel line is typically achieved using threaded connections, clamp connections, or flange connections. Because this connection must withstand a fuel system operating pressure of 0.3-0.8 MPa, and the vehicle experiences continuous vibrations of 10-50 Hz frequency and 0.5-2 mm amplitude during operation, while also facing a fluctuating temperature environment from -40℃ to 120℃, extremely high requirements are placed on the sealing performance of the connection. If the seal fails, it will not only lead to approximately 5%-8% fuel leakage loss annually, but may also pose a risk of detonation due to fuel vapor accumulation. Furthermore, at the connection between the fuel line and the fuel filter, the fuel flowing through the line contains particulate impurities such as dust and metal fragments. These impurities, as they flow with the fuel through the sealing surface, will embed themselves into the sealing material surface under a pressure of 0.3-0.8 MPa, forming indentations. Simultaneously, when the fuel line vibrates, hard particles will slide or roll against the sealing surface, increasing surface roughness and forming micro-grooves.

[0004] Therefore, it is necessary to propose a fuel filter with a high sealing performance and a plastic housing to solve the above problems. Utility Model Content

[0005] This application provides a plastic housing fuel filter with high sealing performance. In order to improve the technical problems existing in the related technology, at the connection between the fuel pipe and the fuel filter, there are particulate impurities such as dust and metal debris in the fuel entering the fuel pipe. When these impurities flow through the sealing surface with the fuel, they will embed into the surface of the sealing material under pressure, forming indentations. At the same time, the relative displacement between the connector and the fuel inlet pipe caused by the vibration of the fuel pipe will reduce the sealing effect.

[0006] This application provides a highly airtight plastic housing fuel filter, including a filter body; an inlet pipe and an outlet pipe disposed on the filter body; a connector that matches and communicates with the inlet pipe; and an oil guide pipe disposed on the connector. The inlet pipe has an abutment groove on its end face, through which an abutment sealing gasket is disposed. An elastic telescopic component is disposed on the end face of the connector that abuts with the abutment sealing gasket. A connecting shell covering the elastic telescopic component is disposed on the outer wall of the connector. The connecting shell is threadedly connected to the inlet pipe, and a backstop component is disposed on the inlet pipe.

[0007] The technical solutions described in this application embodiment have at least the following technical effects: During the process of filtering impurities, fuel passes through the fuel guide pipe, the fuel inlet pipe, and the connection of the connector. The fuel inlet pipe and the connector are sealed by abutment sealing gaskets on their abutment end faces. After filtration, the fuel is discharged through the fuel outlet pipe. During the connection between the connector and the fuel inlet pipe, the connecting shell on the connector is threaded to the fuel inlet pipe. At the same time, the anti-reverse component can limit the position between the fuel inlet pipe and the connector to prevent displacement caused by vibration. After the abutment sealing gasket on the fuel inlet pipe is worn by particulate impurities, the elastic expansion component compensates for the seal by sealing the abutment sealing gasket. The elastic expansion component can automatically adjust according to the wear condition to compensate for the wear of the sealing gasket and ensure that a good sealing effect is always maintained.

[0008] The high-sealing plastic housing fuel filter provided in this application embodiment can compensate for the wear of the contact sealing gasket by means of an elastic telescopic component as the particulate medium continuously flows through the fuel inlet pipe. The elastic telescopic component can automatically adjust according to the wear condition to compensate for the wear of the sealing gasket, ensuring that a good sealing effect is always maintained. Moreover, as the usage time increases, the elastic component can continuously provide compensation force, extending the service life of the seal.

[0009] In this embodiment, the elastic telescopic component includes an abutment sleeve fitted on the end face of the connector, and a telescopic spring disposed inside the abutment sleeve with one end abutting against the abutment sleeve and the other end abutting against the end face of the connector.

[0010] The technical effect of the above embodiments is that after the sealing gasket wears out, the telescopic spring presses against the abutment sleeve, making the abutment sleeve and the sealing gasket tightly pressed together, automatically compensating for the gap caused by wear, and ensuring that the sealing surface always maintains tight contact.

[0011] In this embodiment, a zero-ring seal is provided on both the contact surface of the abutment sleeve and the contact surface of the connector.

[0012] The technical effects of the above embodiments are as follows: the zero-type sealing ring seals the telescopic spring inside the abutment sleeve, effectively preventing fuel from directly contacting the telescopic spring, avoiding corrosion of the spring material by chemicals in the fuel, extending the service life of the spring, and at the same time sealing the internal spring fuel to prevent fuel leakage through the abutment sleeve.

[0013] In this embodiment, the anti-reverse assembly includes a connecting strip rotatably disposed on the outer wall of the oil inlet pipe; an extension piece connected to the connecting strip; and a barb disposed on the inner wall of the extension piece. The connecting housing is provided with a connecting block, and the connecting block is provided with a snap-fit ​​groove.

[0014] The technical effect of the above embodiments is as follows: During the process of connecting the outer shell and the oil inlet pipe threaded connection, by rotating the connecting strip, the barb on the extension piece is engaged with the snap-fit ​​groove on the connecting block. The connecting strip and the extension piece cooperate, and the barb is engaged with the snap-fit ​​groove to form a mechanical lock. When the connector is subjected to axial tension, the biting action of the barb and the snap-fit ​​groove can effectively prevent the connector from falling off or loosening from the oil inlet pipe.

[0015] In this embodiment, the barb includes a connecting portion connected to the extension piece; a beveled portion disposed on the connecting portion; and a protrusion disposed on the connecting portion in the opposite position to the beveled portion.

[0016] The technical effects of the above embodiments are as follows: the beveled surface reduces the friction and insertion resistance when the connector is inserted into the snap-fit ​​slot, making the connection process smoother. The smooth insertion process can prevent the connector from getting stuck or tilting during the insertion process, ensuring the reliability of the connection operation. The protrusion is designed in the opposite position of the beveled surface. When the connector is fully inserted into the snap-fit ​​slot, the protrusion and the bottom or side of the snap-fit ​​slot form a final lock, further restricting the movement of the connector.

[0017] In this embodiment, the snap-fit ​​groove is provided with a limiting part corresponding to the position of the protrusion.

[0018] The technical effect of the above embodiments is that the position of the limiting part and the protrusion are precisely corresponding. When the connector is inserted into the snap-fit ​​groove and rotated into place, the protrusion and the limiting part are tightly engaged to form a precise mechanical limit.

[0019] In this embodiment, both the fuel filter housing and the connector are made of plastic.

[0020] The technical effects of the above embodiments are as follows: a lightweight fuel filter can reduce the overall weight of the vehicle, which helps to improve the vehicle's fuel economy, reduce fuel consumption, and reduce weight can improve the vehicle's acceleration and handling performance, thereby enhancing the driving experience. Attached Figure Description

[0021] Figure 1A three-dimensional structural diagram of a high-sealing plastic housing fuel filter provided in the embodiments of this application;

[0022] Figure 2 This is a cross-sectional structural diagram of the connector provided in an embodiment of this application;

[0023] Figure 3 A cross-sectional structural schematic diagram of the anti-reverse component provided in an embodiment of this application;

[0024] Figure 4 for Figure 3 Enlarged view of point A in the middle.

[0025] The following are the labeling elements in the figure:

[0026] 1. Filter body; 11. Oil inlet pipe; 111. Abutment groove; 112. Abutment sealing ring; 12. Oil outlet pipe; 2. Connector; 21. Oil guide pipe; 22. Connecting shell; 3. Elastic telescopic component; 31. Abutment sleeve; 32. Telescopic spring; 33. Zero-type sealing ring; 4. Anti-reverse component; 41. Connecting strip; 42. Extension piece; 43. Barb; 431. Connecting part; 432. Beveled part; 433. Protrusion; 44. Connecting block; 45. Snap-fit ​​groove; 451. Limiting part. Detailed Implementation

[0027] In existing fuel filters, the connection to the fuel line is typically achieved using threaded connections, clamp connections, or flange connections. Because the connection between the fuel filter and the fuel line must withstand a fuel system operating pressure of 0.3-0.8 MPa, and the vehicle experiences continuous vibrations of 10-50 Hz frequency and 0.5-2 mm amplitude during operation, while also facing a temperature fluctuating environment from -40℃ to 120℃, extremely high requirements are placed on the sealing performance of the connection. If the seal fails, it will not only lead to approximately 5%-8% fuel leakage loss annually, but may also pose a risk of detonation due to fuel vapor accumulation. Furthermore, at the connection between the fuel line and the fuel filter, the fuel flowing through the line contains particulate impurities such as dust and metal fragments. These impurities, as they flow with the fuel through the sealing surface, will embed into the sealing material surface under pressure of 0.3-0.8 MPa, forming indentations. Simultaneously, when the fuel line vibrates, hard particles will slide or roll against the sealing surface, increasing surface roughness and forming micro-grooves.

[0028] Based on this, in order to improve the technical problems existing in the related technology, at the connection between the oil pipe and the fuel filter, because the fuel entering the oil pipe contains particulate impurities such as dust and metal shavings, these impurities will embed into the surface of the sealing material under pressure when the fuel flows through the sealing surface, forming indentations. At the same time, the relative displacement between the connector and the oil inlet pipe caused by the vibration of the oil pipe will reduce the sealing effect. The embodiments of this application provide the following solution.

[0029] Please refer to the following: Figures 1 to 4 This application provides a high-sealing plastic housing fuel filter, which includes a filter body 1; an inlet pipe 11 and an outlet pipe 12 disposed on the filter body 1; a connector 2 that matches and communicates with the inlet pipe 11; and an oil guide pipe 21 disposed on the connector 2. The feature is that: an abutment groove 111 is formed on the end face of the inlet pipe 11, and an abutment sealing gasket is disposed through the abutment groove 111; an elastic telescopic component 3 is disposed on the end face of the connector 2 that abuts with the abutment sealing gasket; a connecting shell 22 covering the elastic telescopic component 3 is disposed on the outer wall of the connector 2; the connecting shell 22 is threadedly connected to the inlet pipe 11; and a backstop component 4 is disposed on the inlet pipe 11.

[0030] The high-sealing plastic-shell fuel filter provided in this application embodiment allows fuel to pass through the fuel guide pipe 21, the fuel inlet pipe 11, and the connection point of the connector 2 during the filtration process. A sealing gasket is used to seal the contact surfaces of the fuel inlet pipe 11 and the connector 2. After filtration, the fuel is discharged through the fuel outlet pipe 12. During the connection between the connector 2 and the fuel inlet pipe 11, a threaded connection is made between the connector 2 and the fuel inlet pipe 11 via the connecting housing 22. Simultaneously, the anti-reverse component 4 limits the position between the fuel inlet pipe 11 and the connector 2, preventing displacement due to vibration. After the sealing gasket on the fuel inlet pipe 11 is worn by particulate impurities, the elastic expansion component 3 compensates for the wear and provides a seal. The elastic expansion component 3 automatically adjusts according to the wear condition to compensate for the wear of the sealing gasket, ensuring a consistently good sealing effect. In this way, the elastic expansion component 3 can compensate for the wear of the sealing gasket as the particulate medium continuously flows through the oil inlet pipe 11. The elastic expansion component 3 can automatically adjust according to the wear condition to compensate for the wear of the sealing gasket, ensuring that a good sealing effect is always maintained. Moreover, as the service time increases, the elastic component can continuously provide compensation force, extending the service life of the seal.

[0031] In this embodiment, the elastic telescopic component 3 includes an abutment sleeve 31 sleeved on the end face of the connector 2, and a telescopic spring 32 disposed inside the abutment sleeve 31 with one end abutting against the abutment sleeve 31 and the other end abutting against the end face of the connector 2.

[0032] With this configuration, after the sealing gasket wears down, the telescopic spring 32 presses against the abutment sleeve 31, ensuring a tight seal between the abutment sleeve 31 and the sealing gasket. This automatically compensates for the gaps caused by wear, ensuring that the sealing surfaces always maintain tight contact. Thus, through the continuous force of the spring, the sealing surfaces remain in close contact, preventing seal failure due to wear. The telescopic spring 32 can automatically adjust its pressure according to actual working conditions, ensuring uniform pressure distribution on the sealing surface and avoiding localized stress concentration.

[0033] In this embodiment, a zero-type sealing ring 33 is provided on both the contact surface of the abutment sleeve 31 and the connector 2.

[0034] This design allows the zero-ring seal 33 to seal the telescopic spring 32 inside the abutment sleeve 31, effectively preventing direct contact between fuel and the telescopic spring 32. This avoids corrosion of the spring material by chemicals in the fuel, extending the spring's service life. Simultaneously, it seals the internal spring fuel, preventing leakage through the abutment sleeve 31. Furthermore, small particles and impurities in the fuel can accelerate spring wear. The seal prevents these particles from entering the spring's working area, reducing physical wear. Fuel can cause the spring surface to become sticky, affecting its normal telescopic movement. The seal prevents this, maintaining smooth spring movement. The zero-ring seal 33 not only seals the spring but also acts as an additional sealing barrier to further prevent fuel leakage.

[0035] In this embodiment, the anti-reverse assembly 4 includes a connecting strip 41 rotatably disposed on the outer wall of the oil inlet pipe 11; an extension piece 42 connected to the connecting strip 41; a barb 43 disposed on the inner wall of the extension piece 42; a connecting block 44 disposed on the connecting housing 22; and a snap-fit ​​groove 45 provided on the connecting block 44.

[0036] With this configuration, during the threaded connection between the outer casing 22 and the oil inlet pipe 11, rotating the connecting bar 41 causes the barb 43 on the extension piece 42 to engage with the locking groove 45 on the connecting block 44. The connecting bar 41 and the extension piece 42 cooperate, and the barb 43 engages with the locking groove 45, forming a mechanical lock. When the connector 2 is subjected to axial tension, the engagement of the barb 43 and the locking groove 45 effectively prevents the connector 2 from detaching from or loosening from the oil inlet pipe 11. Thus, through the engagement of the barb 43 and the locking groove 45, and the cooperation between the connecting bar 41 and the extension piece 42, a double mechanical locking structure is formed, effectively resisting vibration and preventing loosening of the connection.

[0037] In this embodiment, the barb 43 includes a connecting portion 431 connected to the extension piece 42; a beveled portion 432 disposed on the connecting portion 431; and a protrusion 433 disposed on the connecting portion 431 in the opposite position to the beveled portion 432.

[0038] This design reduces friction and insertion resistance when the connector 2 is inserted into the locking groove 45, making the connection process smoother. The smooth insertion process prevents the connector 2 from getting stuck or tilting during insertion, ensuring the reliability of the connection operation. The protrusion 433 is designed in the opposite position of the beveled surface 432. After the connector 2 is fully inserted into the locking groove 45, the protrusion 433 forms a final lock with the bottom or side of the locking groove 45, further restricting the movement of the connector 2. Thus, the beveled surface 432 guides the connector 2 to be inserted in the correct direction, avoiding weak connections or poor sealing caused by tilted insertion. After the beveled surface 432 guides the insertion, the protrusion 433 forms a final lock with the bottom or side of the locking groove 45, providing double safety protection.

[0039] In this embodiment, the snap-fit ​​groove 45 is provided with a limiting part 451 corresponding to the position of the protrusion 433.

[0040] With this configuration, the positions of the limiting part 451 and the protrusion 433 are precisely aligned. When the connector 2 is inserted into the snap-fit ​​groove 45 and rotated into place, the protrusion 433 and the limiting part 451 engage tightly to form a precise mechanical limit. Thus, even under external impact or vibration, the engagement between the protrusion 433 and the snap-fit ​​groove 45 can effectively prevent the connector 2 from loosening or falling off.

[0041] In this embodiment, both the fuel filter housing and the connector 2 are made of plastic.

[0042] This design allows the lightweight fuel filter to reduce the overall vehicle weight, which helps improve fuel economy, reduce fuel consumption, and improve acceleration and handling performance, thus enhancing the driving experience.

[0043] The above description is merely a preferred embodiment of this application and is not intended to limit this application. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this application should be included within the protection scope of this application.

Claims

1. A plastic shell fuel filter with high sealing performance, comprising a filter body (1), an oil inlet pipe (11) and an oil outlet pipe (12) arranged on the filter body (1), a connecting head (2) matched with the oil inlet pipe (11), and a guide pipe (21) arranged on the connecting head (2), characterized in that: The oil inlet pipe (11) has an abutment groove (111) on its end face, and an abutment sealing gasket is provided through the abutment groove (111). An elastic telescopic component (3) is provided on the end face of the connector (2) that abuts the abutment sealing gasket. A connecting shell (22) covering the elastic telescopic component (3) is provided on the outer wall of the connector (2). The connecting shell (22) is connected to the oil inlet pipe (11) by a thread. A backstop component (4) is provided on the oil inlet pipe (11).

2. A high-sealing plastic-shell fuel filter according to claim 1, characterized in that: The elastic telescopic component (3) includes an abutment sleeve (31) sleeved on the end face of the connector (2) and a telescopic spring (32) disposed inside the abutment sleeve (31) with one end abutting against the abutment sleeve (31) and the other end abutting against the end face of the connector (2).

3. A high-sealing plastic-shell fuel filter according to claim 2, characterized in that: Both the abutting sleeve (31) and the connector (2) are provided with zero-type sealing rings (33).

4. A high-sealing plastic-shell fuel filter according to claim 1, characterized in that: The anti-reverse assembly (4) includes a connecting strip (41) rotatably disposed on the outer wall of the oil inlet pipe (11); an extension piece (42) connected to the connecting strip (41); and a barb (43) disposed on the inner wall of the extension piece (42); a connecting block (44) is provided on the connecting housing (22), and a snap-fit ​​groove (45) is provided on the connecting block (44).

5. A high-sealing plastic-shell fuel filter according to claim 4, characterized in that: The barb (43) includes a connecting portion (431) connected to the extension piece (42); a beveled portion (432) provided on the connecting portion (431); and a protrusion (433) provided on the connecting portion (431) in the opposite position to the beveled portion (432).

6. A high-sealing plastic-shell fuel filter according to claim 4 or 5, characterized in that: The snap-fit ​​groove (45) is provided with a limiting part (451) corresponding to the position of the protrusion (433).

7. A high-sealing plastic-shell fuel filter according to claim 1 or 2, characterized in that: The fuel filter housing and connector (2) are both made of plastic.

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