Sealing structure of fuel filter

Abstract

The invention relates to the technical field of fuel filters, in particular to a fuel filter sealing structure which comprises a filtering mounting cover, a precipitation cup is mounted on the filtering mounting cover, a filtering mechanism is mounted on the filtering mounting cover on the inner side of the precipitation cup, and the filtering mechanism is used for filtering impurities in fuel; and a limiting mechanism is mounted on the precipitation cup, is used for sealing the joint of the precipitation cup and the filtering mounting cover and is also used for positioning the mounting position of the filtering mechanism on the filtering mounting cover. The fuel oil filter effectively solves the problems that due to vibration of a vehicle, the structure of an existing fuel oil filter is loosened, sealing failure is caused, and the filtering efficiency is reduced.

Description

Technical Field

[0001] The present invention relates to the technical field of fuel filters, and particularly to a sealing structure of a fuel filter. Background Art

[0002] As a core component of the fuel supply system of an automotive engine, the main function of a fuel filter is to filter out impurities, moisture, colloids and other pollutants in the fuel, ensuring that clean fuel enters the engine injection system, thereby guaranteeing the stable operation and service life of the engine. In the overall structural design of a fuel filter, the sealing structure is a crucial component, and its performance directly affects the filtration efficiency, fuel tightness and working reliability of the filter.

[0003] At present, when a fuel filter is in use, due to the vibration of the vehicle, loosening may occur between the end cover, filter element and housing of the fuel filter due to repeated actions of relative displacement and dynamic loads. In such a vibrating environment for a long time, the elastic sealing element is prone to fatigue deformation, and the tolerance fit relationship of the sealing mating surface will gradually fail, resulting in loosening and displacement of the connecting components. Once loosening occurs, it will not only damage the sealing performance of the fuel filter, causing fuel leakage or filtration failure, but may also lead to serious problems such as filter element breakage and component detachment, posing a threat to the normal operation of the engine and driving safety.

[0004] Therefore, a sealing structure of a fuel filter is proposed to solve the above problems. Summary of the Invention

[0005] The purpose of the present invention is to provide a sealing structure of a fuel filter, effectively solving the problem that the existing fuel filter has loosening between its own structures due to vehicle vibration, thereby causing sealing failure and a decrease in filtration efficiency.

[0006] To achieve the above purpose, the present invention provides the following technical solution: A sealing structure of a fuel filter, including a filtration mounting cover, a sediment cup is installed on the filtration mounting cover, a filtration mechanism is installed on the filtration mounting cover inside the sediment cup, and the filtration mechanism is used to filter impurities in the fuel; A limiting mechanism is installed on the sediment cup, and the limiting mechanism is used to seal the connection between the sediment cup and the filtration mounting cover, and also used to locate the installation position of the filtration mechanism on the filtration mounting cover.

[0007] Preferably, the limiting mechanism includes a mounting frame, an external thread is provided on the outer periphery of the mounting frame, the limiting mechanism is threadedly connected to the filtration mounting cover through the mounting frame, and the upper end surface of the mounting frame is designed with an open structure and is provided with a cavity; An axial hole is opened in the inner periphery of the mounting frame and an elastic element is embedded and installed, and the elastic element is used to limit the filtration mechanism; A lip seal is fixedly installed on the upper end surface of the mounting bracket, and the lip seal is used to seal the connection between the limit mechanism and the filter mounting cover; A second limit groove is axially formed on the outer side of the bottom of the mounting bracket.

[0008] When the above technical solution is adopted, the external thread of the mounting bracket realizes the detachable connection with the filter mounting cover, which is convenient for disassembly and maintenance; The lip seal has axial sealing ability, and is made of fuel-resistant rubber material, and is fixed on the upper end surface of the mounting bracket by adhesive or clamping groove, which can effectively isolate fuel and prevent leakage; The elastic element is embedded in the inner peripheral hole of the mounting bracket to provide a radial limiting force for the filtering mechanism.

[0009] Preferably, the elastic element includes a cylinder body, an inner rod passes through the cylinder body, one end of the inner rod in the cylinder body is fixedly installed with a piston, the piston is in interference fit with the inner wall of the cylinder body, and a second elastic member is installed on the piston, and the second elastic member is used to provide a reset elastic force for the piston; One end of the second elastic member away from the piston is elastically connected to the cylinder body, and one end of the cylinder body away from the inner rod extends into the cavity and is provided with an air inlet hole.

[0010] When the above technical solution is adopted, the interference fit between the piston and the inner wall of the cylinder body realizes the sealed sliding connection. The second elastic member adopts a tension spring structure, and its two ends respectively abut against the piston and the bottom of the cylinder body to provide a reset elastic force for the piston, so that the inner rod always maintains a tendency to contract inward; The air inlet hole ensures that the air pressure in the cylinder body is balanced with the air pressure in the cavity. Thus, when the lip seal is pressed, the pressure in the cavity can be increased and the inner rod can extend out of the cylinder body, so as to adaptively abut against the filtering mechanism through the inner rod.

[0011] Preferably, the filtering mechanism includes a filter element, and a connecting seat is installed on the top of the filter element. The connecting seat is used to connect the filter element and the filter mounting cover; The connecting seat is provided with an external thread, the connecting seat is threadedly connected with the filter mounting cover, and a sealing gasket is installed on the connecting seat. The sealing gasket is used to seal the connection between the filtering mechanism and the filter mounting cover.

[0012] When the above technical solution is adopted, the lower end of the connecting seat and the filter element are welded by hot melting. The external thread of the connecting seat realizes the detachable connection between the filtering mechanism and the filter mounting cover. The sealing gasket is made of oil-resistant rubber material, is sleeved on the step surface below the external thread of the connecting seat, and is located between the mating surfaces of the connecting seat and the filter mounting cover. It has radial and axial sealing capabilities, effectively prevents fuel from leaking from the connection, and at the same time provides an installation and positioning reference for the filter element.

[0013] Preferably, the longitudinal section of the sealing washer is designed in an I-shaped structure. The groove on the outer periphery of the sealing washer provides an expansion space for the inner rod. When the extended inner rod is inserted into the groove on the outer periphery of the sealing washer, the filtering mechanism and the filter installation cover are limited in position. The sealing washer cooperates with the extended inner rod to maintain the relative position after the connection of the filtering mechanism and the filter installation cover.

[0014] When the above technical solution is adopted, the outer peripheral groove of the I-shaped sealing washer realizes the purpose of guiding the movement of the inner rod in the elastic element. The inner rod is designed with a hemispherical end and has the ability of self-adaptive centering. After the installation of the filtering mechanism is completed, it can gradually enter the outer peripheral groove of the I-shaped sealing washer with the installation of the sediment cup, make sliding contact with the inner wall of the groove, and limit its axial displacement. At the same time, the sealing washer undertakes the dual functions of sealing and limiting, and is used to improve the structural stability of the connection between the filter installation cover and the filtering mechanism.

[0015] Preferably, a liquid inlet channel and a liquid outlet channel are provided in the filter installation cover. The liquid inlet channel and the liquid outlet channel are respectively used for the entry and the filtered discharge of fuel. A first limiting groove is axially opened on the inner side of the bottom of the filter installation cover.

[0016] When the above technical solution is adopted, the independent design of the liquid inlet channel and the liquid outlet channel realizes the one-way flow of fuel, and a guiding inclined surface is provided on the inner wall of the channel, and the guiding inclined surface can reduce the flow resistance of fuel.

[0017] Preferably, the opening positions of the first limiting groove and the second limiting groove match each other, and the first limiting groove and the second limiting groove cooperate to form a limiting hole.

[0018] When the above technical solution is adopted, the axial alignment design of the first limiting groove and the second limiting groove realizes the combined formation of the limiting hole. The limiting hole is designed in a cylindrical structure and forms a precise fit with the pin rod to ensure that there is no shaking after the pin rod is inserted, and has a reliable circumferential limiting ability, which can effectively inhibit the relative rotation of the sediment cup and the filter installation cover caused by vibration and improve the anti-vibration performance of the connection structure.

[0019] Preferably, a lining sleeve is provided in the sediment cup. A sealing chamber is formed between the lining sleeve and the sediment cup. The bottom of the sediment cup is provided with an opening and a drain cock is installed. A limiting component is installed on the sediment cup, and the limiting component is used to prevent the connection between the installed sediment cup and the filter installation cover from loosening.

[0020] When the above technical solution is adopted, the stainless steel lining sleeve realizes the corrosion-resistant protection of the inner wall of the sediment cup through the rolling and fitting process, and improves the structural strength. The drain cock is made of brass and equipped with a sealing rubber ring to facilitate the regular discharge of settled water and impurities; The limit assembly is installed on the shoulder of the sedimentation cup. The setting position of the limit assembly corresponds precisely to the limit hole, providing an installation basis for the pin rod and forming a multiple anti-loosening structure.

[0021] Preferably, the limiting assembly includes a mounting seat, which is fixedly mounted on the outer wall of the sedimentation cup. A pin rod is slidably mounted in the mounting seat, one end of the pin rod passes through the mounting seat and is inserted into the limiting hole. A first elastic member is mounted on the pin rod, and the first elastic member is used to push the pin rod into the limiting hole. A connecting ring is installed at the end of the pin rod facing away from the limiting hole, and the connecting ring is used to pull the pin rod out of the limiting hole.

[0022] When the above technical solution is adopted, a boss is provided in the middle of the pin rod, and the first elastic member is a compression spring, whose two ends are respectively connected to the boss and the mounting seat, and a continuous insertion force is applied to the pin rod through the boss structure to ensure that the limit hole is always in a locked state; The connecting ring is a ring-shaped handle with a diameter suitable for finger operation. The connecting ring provides a convenient grip end for manual operation. The entire set of limit components has an automatic anti-loosening function, which can effectively resist loose connection caused by vehicle vibration.

[0023] Compared with the prior art, the present invention has the following beneficial effects: The present invention provides a limiting mechanism, which is used to seal the connection between the sedimentation cup and the filter installation cover to prevent fuel leakage or sealing failure caused by a gap between the two due to vehicle vibration. On the other hand, the limiting mechanism is used to locate the installation position of the filter mechanism on the filter mounting cover. By positioning the installation of the filter mechanism through the limiting mechanism, the relative displacement of the filter mechanism and the filter mounting cover under a vibration environment is effectively suppressed, thereby ensuring that the filter mechanism stably filters fuel impurities and avoiding the problem of reduced filtration efficiency due to looseness, ultimately improving the sealing reliability and working stability of the fuel filter under vibration conditions. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 It is a schematic diagram of the main structure of the present invention; Figure 2 It is a schematic diagram of the explosion connection structure of the sedimentation cup, the filtering mechanism and the limiting mechanism of the present invention; Figure 3 It is a schematic diagram of the cross-sectional structure of the limiting mechanism of the present invention; Figure 4 For the present invention Figure 3 The enlarged structural diagram at A in the middle; Figure 5 It is a schematic diagram of the structure of the filtering mechanism of the present invention; Figure 6Schematic diagram of the connection structure of the first perspective section of the filter installation cover of the present invention; Figure 7 Schematic diagram of the connection structure of the second perspective section of the filter installation cover of the present invention; Figure 8 For the present invention Figure 7 Enlarged structure diagram at position B in Figure 9 Schematic diagram of the connection structure of the third perspective section of the filter installation cover of the present invention; Figure 10 Schematic diagram of the sediment cup structure of the present invention; Figure 11 Schematic diagram of the cross-sectional structure of the sediment cup of the present invention; Figure 12 Schematic diagram of the structure of the limit component of the present invention.

[0025] In the figure: 1, sediment cup; 11, limit component; 111, mounting seat; 112, pin rod; 113, connecting ring; 114, first elastic member; 12, drain cock; 13, inner lining sleeve; 2, filter installation cover; 21, liquid inlet channel; 22, liquid outlet channel; 23, first limit groove; 3, filtering mechanism; 31, filter element; 32, communicating seat; 33, sealing gasket; 4, limiting mechanism; 41, mounting frame; 411, cavity; 412, second limit groove; 42, lip seal; 43, elastic element; 431, cylinder; 4311, air inlet hole; 432, second elastic member; 433, piston; 434, inner rod. Detailed implementation manners

[0026] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0027] Embodiment 1: As Figures 1 to 12 shown, an embodiment provided by the present invention: A fuel filter sealing structure includes a filter installation cover 2, a sediment cup 1 is installed on the filter installation cover 2, and a filtering mechanism 3 is installed on the filter installation cover 2 inside the sediment cup 1. The filtering mechanism 3 is used to filter impurities in the fuel; A limiting mechanism 4 is installed on the sediment cup 1. The limiting mechanism 4 is used to seal the connection between the sediment cup 1 and the filter installation cover 2, and is also used to locate the installation position of the filtering mechanism 3 on the filter installation cover 2.

[0028] Specifically, by setting the limiting mechanism 4, the limiting mechanism 4 is used to seal the connection between the sedimentation cup 1 and the filter installation cover 2 to avoid fuel leakage or sealing failure caused by a gap between the two due to vehicle vibration; On the other hand, the limiting mechanism 4 is used to locate the installation position of the filter mechanism 3 on the filter mounting cover 2. The installation of the filter mechanism 3 is positioned by the limiting mechanism 4, which effectively suppresses the relative displacement of the filter mechanism 3 and the filter mounting cover 2 under a vibration environment, thereby ensuring that the filter mechanism 3 stably filters fuel impurities and avoids the problem of reduced filtering efficiency due to looseness, ultimately improving the sealing reliability and working stability of the fuel filter under vibration conditions.

[0029] Embodiment 2: In order to achieve stable cooperation and sealing function between the limiting mechanism and the filtering mechanism, as Figures 3 to 5 As shown, in this embodiment, the limiting mechanism 4 includes a mounting frame 41, the outer periphery of the mounting frame 41 is provided with external threads, and the lower end of the mounting frame 41 is welded and installed with the top of the sedimentation cup 1, thereby ensuring the connection stability between the two.

[0030] The limiting mechanism 4 is threadedly connected to the filter mounting cover 2 via a mounting frame 41 . The upper end surface of the mounting frame 41 is designed with an open structure and a cavity 411 is provided inside the mounting frame 41 .

[0031] The mounting frame 41 is provided with a plurality of embedding holes evenly arranged axially on the inner periphery thereof and an elastic element 43 is embedded and installed therein. The elastic element 43 comprises a cylinder 431, an inner rod 434 passing through the cylinder 431, a piston 433 is fixedly installed on one end of the inner rod 434 in the cylinder 431, the piston 433 is interference fit with the inner wall of the cylinder 431, a second elastic member 432 is installed on the piston 433, the second elastic member 432 is used for providing a reset elastic force to the piston 433, one end of the second elastic member 432 which is away from the piston 433 is elastically connected to the bottom of the cylinder 431, one end of the cylinder 431 which is away from the inner rod 434 extends into the cavity 411 and is provided with an air inlet hole 4311, the elastic element 43 is used for limiting the filtering mechanism 3, the adaptive extension of the inner rod 434 is achieved by the change of air pressure, and the radial position of the filtering mechanism 3 is limited.

[0032] A lip seal ring 42 is fixedly installed on the upper end surface of the mounting frame 41 through a slot. The lip seal ring 42 is made of fuel-resistant rubber material and has good sealing performance. It fits tightly with the lower end surface of the filter mounting cover 2 and is used to seal the connection between the limit mechanism 4 and the filter mounting cover 2.

[0033] When the lip seal 42 is pressurized, the air pressure of the cavity 411 enters the cylinder 431 through the air inlet 4311, pushing the piston 433 to move, and the inner rod 434 adaptively extends and embeds into the outer peripheral groove of the sealing gasket 33; A second limiting groove 412 is axially defined on the outer side of the bottom of the mounting frame 41 .

[0034] The filter mechanism 3 includes a filter element 31, and a connecting seat 32 is installed on the top of the filter element 31 by hot-melt welding. The connecting seat 32 is used to connect the filter element 31 and the filter installation cover 2. An external thread is provided on the connecting seat 32, and the connecting seat 32 is threadedly connected to the filter installation cover 2. A step surface is provided below the external thread, and a sealing gasket 33 is sleeved on the step surface. The sealing gasket 33 is made of oil-resistant nitrile rubber material, which not only achieves sealing, but also has an I-shaped structure design. The groove on the outer periphery provides an extension space for the inner rod 434, and cooperates with the extended inner rod 434 to limit the axial displacement and circumferential rotation of the filter mechanism 3, thereby improving the connection stability, resisting vibration loosening, and maintaining the relative position of the filter mechanism 3 and the filter installation cover 2 after connection, thereby improving the connection stability.

[0035] Embodiment 3: In order to realize the precise molding of the limiting hole of the filter installation cover and the reliable matching of the circumferential anti-loosening structure, as Figures 6 to 9 As shown, in this embodiment, a liquid inlet channel 21 and a liquid outlet channel 22 are provided in the filter mounting cover 2. The inner walls of the liquid inlet channel 21 and the liquid outlet channel 22 are provided with a 30°-45° guide slope, and the inner walls are polished to optimize the fuel flow path, reduce flow resistance, and improve filtration efficiency, which are respectively used for the entry of fuel and the discharge of fuel after filtration.

[0036] A first limiting groove 23 is axially opened on the inner side of the bottom of the filter mounting cover 2, and the opening positions of the first limiting groove 23 and the second limiting groove 412 match each other. Both the first limiting groove 23 and the second limiting groove 412 are semi-cylindrical groove bodies, and the two are axially aligned to form a complete cylindrical limiting hole.

[0037] The inner wall of the limit hole is nickel-plated to enhance wear resistance and corrosion resistance, ensure the clearance fit accuracy after the pin rod 112 is inserted, and the limit hole cooperates with the pin rod 112 of the limit assembly 11 to form a circumferential anti-loosening structure of "groove combination + precision insertion", thereby suppressing the relative rotation between the sedimentation cup 1 and the filter installation cover 2 caused by vibration.

[0038] The symmetrical design of the double grooves further improves the uniformity of the circumferential constraints and ensures the stability of the connection structure under dynamic loads.

[0039] Embodiment 4: In order to improve the corrosion resistance, structural strength and automatic anti-loosening reliability of the precipitation cup, as Figures 10 to 12 As shown, in this embodiment, an inner sleeve 13 is provided in the sedimentation cup 1. The inner sleeve 13 is made of 304 stainless steel with a thickness of 1.5-2 mm and is fixed inside the sedimentation cup 1 through a cold rolling bonding process to prevent moisture and acidic substances in the fuel from corroding the sedimentation cup body and improve the structural strength of the sedimentation cup 1. The bottom of the sedimentation cup 1 is provided with an opening and a drain cock 12 is installed. The drain cock 12 is made of H62 brass, with a thread specification of M10×1.25, equipped with a fluororubber sealing gasket, and the inner diameter of the drain port is φ8mm, ensuring drainage efficiency and reliable sealing.

[0040] A limiting component 11 is installed on the sedimentation cup 1. The limiting component 11 is used to prevent loosening at the connection between the installed sedimentation cup 1 and the filter installation cover 2. The limiting component 11 includes a mounting base 111. The mounting base 111 is fixedly welded to the shoulder of the outer wall of the sedimentation cup 1 by argon arc welding. A pin rod 112 is slidably installed in the mounting base 111. A boss structure is provided in the middle of the pin rod 112. One end of the pin rod 112 passes through the mounting base 111 and is inserted into the limiting hole. The pin rod 112 is made of 45# steel and its surface is chrome-plated. The end of the pin rod 112 inserted into the limiting hole is a conical guide head, which is convenient for automatic centering during insertion; A first elastic member 114 is sleeved on the pin rod 112. The first elastic member 114 is a compression spring, and its two ends respectively abut against the boss and the inner wall of the mounting base 111. The pin rod 112 is kept inserted into the limiting hole by the elastic force, realizing automatic anti-loosening. A connecting ring 113 is installed at the end of the pin rod 112 away from the limiting hole. The connecting ring 113 is made of 304 stainless steel round steel and is bent into an annular handle. The surface is processed with knurled anti-slip lines, which is adapted to the finger grip, improving the convenience of disassembly and assembly operations, facilitating manual pulling of the pin rod 112 out of the limiting hole, and being convenient for disassembly, assembly and maintenance.

[0041] When the present invention is in use, the communication seat 32 of the filtering mechanism 3 is aligned with the threaded interface of the filter installation cover 2 and screwed in clockwise until the sealing gasket 33 closely fits the mating surface of the filter installation cover 2 and the communication seat 32. At this time, the I-shaped structure of the sealing gasket 33 undergoes radial and axial compression deformation to complete the preliminary sealing at the connection between the filtering mechanism 3 and the filter installation cover 2; meanwhile, the threaded connection of the communication seat 32 provides a basic positioning for the filter element 31.

[0042] Align the sedimentation cup 1 fixedly connected to the limiting mechanism 4 with the bottom of the filter installation cover 2, hold the sedimentation cup 1 and rotate it upward, so that the external thread on the outer periphery of the mounting frame 41 of the limiting mechanism 4 is screwed into the bottom of the filter installation cover 2 synchronously with the sedimentation cup 1.

[0043] Continue to rotate until the lip seal 42 is completely in contact with and deformed under pressure against the lower end face of the filter installation cover 2: the lip seal 42 fills the gap between the mounting frame 41 and the filter installation cover 2 through elastic deformation to complete the synchronous sealing at the connection between the sedimentation cup 1 and the filter installation cover 2; Meanwhile, due to the pressure on the lip seal 42, the air pressure in the cavity 411 on the upper end face of the mounting frame 41 increases, and the inner rod 434 is pushed out through the air inlet hole 4311 of the elastic element 43 and embedded in the outer groove of the sealing gasket 33 of the filtering mechanism 3, synchronously completing the radial limit of the filtering mechanism 3 and restricting its axial and circumferential displacements.

[0044] It should be noted that before installing the sediment cup 1, it is necessary to first pull the connecting ring 113 of the limit component 11 to overcome the elasticity of the first elastic member 114 and fully retract the pin rod 112 into the mounting seat 111 to prevent the pin rod 112 from hindering the sleeving of the sediment cup 1.

[0045] After the sediment cup 1 and the filter installation cover 2 are screwed together, release the connecting ring 113. The first elastic member 114 pushes the pin rod 112 to axially extend, and its end precisely inserts into the limit hole formed by the synchronous alignment of the first limit groove 23 on the filter installation cover 2 and the second limit groove 412 on the mounting rack 41 of the limit mechanism 4. Through the tight fit between the pin rod 112 and the limit hole, the circumferential relative position of the sediment cup 1 and the filter installation cover 2 is locked, and the final anti-vibration and anti-loosening lock is completed.

[0046] During regular maintenance, the water and impurities deposited inside can be discharged through the drain cock 12 at the bottom of the sediment cup 1; During disassembly, reverse the above steps, that is, pull the connecting ring 113 to withdraw the pin rod 112, and unscrew the threads of the mounting rack 41 and the connecting seat 32 to separate the components.

[0047] The above shows and describes the basic principles, main features and advantages of the present invention. For those skilled in the art, it is obvious that the present invention is not limited to the details of the above exemplary embodiments, and without departing from the spirit or basic features of the present invention, the present invention can be implemented in other specific forms. Therefore, from any point of view, the embodiments should be regarded as exemplary and non-limiting. The scope of the present invention is defined by the appended claims rather than the above description. Therefore, all changes falling within the meaning and scope of the equivalent elements of the claims are intended to be embraced within the present invention. Any reference signs in the claims should not be regarded as limiting the claims involved.

[0048] In addition, it should be understood that although this specification is described according to embodiments, not every embodiment only contains an independent technical solution. This narrative way of the specification is only for clarity. Those skilled in the art should regard the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. A fuel filter sealing structure, comprising a filter mounting cover (2), a sedimentation cup (1) mounted on the filter mounting cover (2), a filter mechanism (3) mounted on the filter mounting cover (2) inside the sedimentation cup (1), the filter mechanism (3) being used to filter impurities in the fuel, characterized in that: A limiting mechanism (4) is installed on the sedimentation cup (1), and the limiting mechanism (4) is used to seal the connection between the sedimentation cup (1) and the filter installation cover (2), and is also used to locate the installation position of the filter mechanism (3) on the filter installation cover (2).

2. The fuel filter sealing structure according to claim 1, characterized in that, The limiting mechanism (4) comprises a mounting frame (41), the outer periphery of the mounting frame (41) is provided with external threads, the limiting mechanism (4) is threadedly connected to the filter mounting cover (2) via the mounting frame (41), and the upper end surface of the mounting frame (41) adopts an open structure design and is provided with a cavity (411); The mounting frame (41) has an axial opening on its inner periphery and an elastic element (43) embedded therein, the elastic element (43) being used for limiting the filtering mechanism (3); A lip seal ring (42) is fixedly mounted on the upper end surface of the mounting frame (41), and the lip seal ring (42) is used to seal the connection between the limiting mechanism (4) and the filter mounting cover (2); A second limiting groove (412) is axially provided on the outer side of the bottom of the mounting frame (41).

3. A fuel filter sealing structure according to claim 2, characterized in that, The elastic element (43) comprises a cylinder (431), an inner rod (434) passing through the cylinder (431), a piston (433) fixedly mounted on one end of the inner rod (434) in the cylinder (431), the piston (433) and the inner wall of the cylinder (431) being interference fit, a second elastic member (432) being mounted on the piston (433), and the second elastic member (432) being used to provide a restoring elastic force to the piston (433); One end of the second elastic member (432) that is away from the piston (433) is elastically connected to the cylinder (431); one end of the cylinder (431) that is away from the inner rod (434) extends into the cavity (411) and is provided with an air inlet hole (4311).

4. A fuel filter sealing structure according to claim 1, characterized in that, The filtering mechanism (3) comprises a filter core (31), a connecting seat (32) being installed on the top of the filter core (31), and the connecting seat (32) is used to connect the filter core (31) and the filter installation cover (2); The connecting seat (32) is provided with an external thread, the connecting seat (32) is threadedly connected to the filter installation cover (2), and a sealing gasket (33) is installed on the connecting seat (32), and the sealing gasket (33) is used to seal the connection between the filter mechanism (3) and the filter installation cover (2).

5. The fuel filter sealing structure according to claim 4, characterized in that, The longitudinal cross-section of the sealing gasket (33) adopts an I-shaped structural design, and the groove on the outer periphery of the sealing gasket (33) is used to provide extension space for the inner rod (434). When the extended inner rod (434) is inserted into the groove on the outer periphery of the sealing gasket (33), the filter mechanism (3) and the filter installation cover (2) are limited.

6. A fuel filter sealing structure according to claim 1, characterized in that, The filter installation cover (2) is provided with a liquid inlet channel (21) and a liquid outlet channel (22), wherein the liquid inlet channel (21) and the liquid outlet channel (22) are used for the inlet of fuel and the outlet of fuel after filtering, respectively; A first limiting groove (23) is axially provided on the inner side of the bottom of the filter installation cover (2).

7. A fuel filter sealing structure according to claim 6, characterized in that, The first limiting groove (23) and the second limiting groove (412) are opened at positions matching each other, and the first limiting groove (23) and the second limiting groove (412) cooperate to form a limiting hole.

8. A fuel filter sealing structure according to claim 1, characterized in that, An inner liner (13) is provided in the sedimentation cup (1), and a sealed chamber is formed between the inner liner (13) and the sedimentation cup (1); The bottom of the sedimentation cup (1) is opened and equipped with a drain cock (12); The sedimentation cup (1) is installed with a limit assembly (11), and the limit assembly (11) is used to prevent the connection between the sedimentation cup (1) and the filter installation cover (2) from becoming loose after installation.

9. A fuel filter sealing structure according to claim 8, characterized in that, The limiting assembly (11) comprises a mounting seat (111), the mounting seat (111) being fixedly mounted on the outer wall of the precipitation cup (1), a pin rod (112) being slidably mounted in the mounting seat (111), one end of the pin rod (112) passing through the mounting seat (111) and being inserted into the limiting hole, a first elastic member (114) being sleeved on the pin rod (112), the first elastic member (114) being used to push the pin rod (112) into the limiting hole, and a connecting ring (113) being mounted on one end of the pin rod (112) facing away from the limiting hole, the connecting ring (113) being used to pull the pin rod (112) out of the limiting hole.

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