A fuel filter sealing structure

Abstract

The present application relates to the technical field of fuel filter, especially to a sealing structure of fuel filter, which comprises a filter installation cover, a sediment cup is installed on the filter installation cover, a filter mechanism is installed on the filter installation cover inside the sediment cup, and the filter mechanism is used for filtering impurities in fuel; a limiting mechanism is installed on the sediment cup, and the limiting mechanism is used for sealing the connecting part of the sediment cup and the filter installation cover and positioning the installation position of the filter mechanism on the filter installation cover. The present application effectively solves the problem that the existing fuel filter is loose between structures due to vehicle vibration, which further causes sealing failure and filter efficiency decline.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of fuel filter, in particular to a fuel filter sealing structure. BACKGROUND

[0002] As the core component of the fuel supply system of the automobile engine, the main function of the fuel filter is to filter out the impurities, moisture and gum pollutants in the fuel, to ensure that the clean fuel enters the fuel injection system of the engine, so as to protect the stable operation and service life of the engine. In the overall structure design of the fuel filter, the sealing structure is a crucial part, and its performance directly affects the filtering efficiency, fuel sealing performance and working reliability of the filter.

[0003] At present, when the fuel filter is used, the end cover, filter element and shell of the fuel filter will be loose due to the relative displacement and repeated action of dynamic load caused by the vibration of the vehicle. In the long-term vibration environment, the elastic sealing element is prone to fatigue deformation, and the tolerance fit relationship of the sealing fit surface will also gradually fail, which will cause the loose displacement of the connecting parts. Once loosening occurs, not only the sealing performance of the fuel filter will be damaged, causing fuel leakage or filtering failure, but also the filter element may be damaged, the parts may be detached, and other serious problems may occur, which will threaten the normal operation of the engine and the safety of driving.

[0004] Therefore, a fuel filter sealing structure is provided to solve the above problems. SUMMARY

[0005] The purpose of the present application is to provide a fuel filter sealing structure, which effectively solves the problem of loosening between the structures of the existing fuel filter caused by vehicle vibration, which further causes sealing failure and decline in filtering efficiency.

[0006] To achieve the above purpose, the present application provides the following technical scheme: a fuel filter sealing structure, comprising a filter installation cover, a sediment cup is installed on the filter installation cover, a filter mechanism is installed on the filter installation cover inside the sediment cup, and the filter mechanism is used for filtering impurities in fuel.

[0007] A limiting mechanism is installed on the sediment cup, which is used for sealing the connection between the sediment cup and the filter installation cover, and positioning the installation position of the filter mechanism on the filter installation cover.

[0008] Preferably, the limiting mechanism comprises a mounting bracket, an outer thread is arranged on the outer periphery of the mounting bracket, the limiting mechanism is threadedly connected with the filter installation cover through the mounting bracket, and the upper end surface of the mounting bracket is designed as an open structure and is provided with a cavity.

[0009] The inner periphery of the mounting bracket is axially opened and embedded with an elastic element, and the elastic element is used for limiting the filter mechanism.

[0010] The upper end surface of the mounting frame is fixedly provided with a lip-shaped sealing ring, which is used for sealing the connection between the limiting mechanism and the filter mounting cover.

[0011] A second limiting groove is formed in the bottom outer side of the mounting frame in the axial direction.

[0012] When the above technical solution is adopted, the external thread of the mounting frame realizes detachable connection with the filter mounting cover, facilitating disassembly and maintenance.

[0013] The lip-shaped sealing ring has axial sealing capability, is made of fuel-resistant rubber material, and is fixed to the upper end surface of the mounting frame by an adhesive or a clamping groove, so as to effectively isolate fuel and prevent leakage.

[0014] The elastic element is embedded in the inner circumferential hole of the mounting frame to provide radial limiting force for the filtering mechanism.

[0015] 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 provided with a piston, the piston is in interference fit with the inner wall of the cylinder body, a second elastic element is installed on the piston, and the second elastic element is used for providing reset elastic force to the piston.

[0016] One end of the second elastic element away from the piston is elastically connected with the cylinder body, and the end of the cylinder body away from the inner rod extends into the cavity and is provided with an air inlet hole.

[0017] When the above technical solution is adopted, the interference fit between the piston and the inner wall of the cylinder body realizes sealed sliding connection, the second elastic element adopts a tensile spring structure, and the two ends thereof abut against the piston and the bottom of the cylinder body respectively, so as to provide reset elastic force to the piston and make the inner rod always have a tendency to shrink inward.

[0018] The air inlet hole ensures that the air pressure in the cylinder body is balanced with the air pressure in the cavity, so that when the lip-shaped sealing ring is pressed, the pressure in the cavity is increased and the inner rod extends out of the cylinder body, so that the inner rod is self-adaptively abutted against the filtering mechanism.

[0019] Preferably, the filtering mechanism includes a filter core, and a communication seat is installed on the top of the filter core, which is used for connecting the filter core and the filter mounting cover.

[0020] The communication seat is provided with an external thread, is threadedly connected with the filter mounting cover, is provided with a sealing gasket, and is used for sealing the connection between the filtering mechanism and the filter mounting cover.

[0021] When the above technical solution is adopted, the lower end of the communication seat is welded with the filter element by hot melting, the outer thread of the communication seat realizes the detachable connection of the filter mechanism and the filter installation cover, the sealing gasket is made of oil-resistant rubber material, is sleeved on the stepped surface below the outer thread of the communication seat, and is located between the mating surface of the communication seat and the filter installation cover, has radial and axial sealing capacity, effectively prevents fuel from leaking from the connection, and provides installation positioning reference for the filter element.

[0022] Preferably, the longitudinal section of the sealing gasket adopts an I-shaped structure design, and the groove on the outer periphery of the sealing gasket is used to provide extension space for the inner rod. When the extended inner rod is inserted into the groove on the outer periphery of the sealing gasket, the filter mechanism and the filter installation cover are limited, and the sealing gasket cooperates with the extended inner rod to keep the relative position of the filter mechanism and the filter installation cover after connection.

[0023] When the above technical solution is adopted, the groove on the outer periphery of the I-shaped sealing gasket realizes the purpose of guiding the movement of the inner rod in the elastic element. The inner rod adopts a hemispherical end design and has self-adaptive centering capability. After the installation of the filter mechanism is completed, the inner rod gradually enters the groove on the outer periphery of the I-shaped sealing gasket with the installation of the sediment cup, slides in contact with the inner wall of the groove, and limits the axial displacement thereof.

[0024] At the same time, the sealing gasket simultaneously bears the dual functions of sealing and limiting, and is used to improve the stability of the connection structure between the filter installation cover and the filter mechanism.

[0025] Preferably, the filter installation cover is internally provided with an inlet channel and an outlet channel, and the inlet channel and the outlet channel are respectively used for the entry of fuel and the discharge of filtered fuel.

[0026] The bottom inner side of the filter installation cover is axially provided with a first limiting groove.

[0027] When the above technical solution is adopted, the independent design of the inlet channel and the outlet channel realizes the one-way flow of fuel, and the inner wall of the channel is provided with a flow guide slope, which can reduce the flow resistance of fuel.

[0028] Preferably, the first limiting groove and the second limiting groove are matched in opening position, and the first limiting groove and the second limiting groove cooperatively form a limiting hole.

[0029] 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 adopts a cylindrical structure and forms a precise fit with the pin rod, so as to ensure that the pin rod does not shake after being inserted, has reliable circumferential limiting capability, can effectively inhibit the relative rotation of the sediment cup and the filter installation cover due to vibration, and improves the anti-vibration performance of the connection structure.

[0030] Preferably, the sediment cup is internally provided with an inner bushing, and a sealed chamber is formed between the inner bushing and the sediment cup.

[0031] The sediment cup bottom is provided with an opening and a drain plug is installed on the opening;

[0032] A limiting assembly is installed on the sediment cup, and the limiting assembly is used for inhibiting loosening of the connecting part between the installed sediment cup and the filter installation cover.

[0033] When the above technical scheme is adopted, the stainless steel inner bushing is realized by rolling and adhering process, corrosion protection of the inner wall of the sediment cup is realized, and the structural strength is improved.

[0034] The drain plug is made of brass and is provided with a sealing rubber ring, so that the sediment water and impurities can be discharged regularly.

[0035] The limiting assembly is installed on the shoulder of the sediment cup, the setting position of the limiting assembly is accurately corresponding to the limiting hole, the limiting assembly provides a mounting base for the pin rod, and a multiple anti-loosening structure is formed.

[0036] Preferably, the limiting assembly comprises a mounting seat fixedly installed on the outer wall of the sediment cup, a pin rod slidably installed in the mounting seat, one end of the pin rod penetrating through the mounting seat and being inserted into the limiting hole, a first elastic member sleeved on the pin rod, the first elastic member being used for pushing the pin rod to be inserted into the limiting hole, and a connecting ring installed on the end of the pin rod away from the limiting hole, the connecting ring being used for pulling the pin rod out of the limiting hole.

[0037] When the above technical scheme is adopted, the middle part of the pin rod is provided with a boss, and the first elastic member is a compression spring, two ends of the compression spring are connected with the boss and the mounting seat respectively, the boss structure is used for applying a continuous insertion force to the pin rod, and the limiting hole is always in a locked state.

[0038] The connecting ring is a ring-shaped handle, the diameter of the handle is matched with the fingers, the connecting ring provides a convenient holding end for manual operation, the whole limiting assembly has an automatic anti-loosening function, and the connecting loosening caused by vehicle vibration can be effectively resisted.

[0039] Compared with the prior art, the present application has the following beneficial effects:

[0040] The limiting mechanism is used for sealing the connecting part between the sediment cup and the filter installation cover, and fuel leakage or sealing failure caused by a gap between the two due to vehicle vibration is avoided.

[0041] The limiting mechanism is used for positioning the installation position of the filtering mechanism on the filter installation cover, the installation of the filtering mechanism is positioned by the limiting mechanism, relative displacement between the filtering mechanism and the filter installation cover in a vibration environment is effectively inhibited, the filtering mechanism is ensured to stably filter fuel impurities, the problem of reduced filtering efficiency caused by loosening is avoided, and finally the sealing reliability and working stability of the fuel filter in a vibration working condition are improved. BRIEF DESCRIPTION OF DRAWINGS

[0042] Figure 1 It is a schematic view of the main structure of the present application;

[0043] Figure 2 It is a schematic view of the explosion connection structure of the sediment cup, the filtering mechanism and the limiting mechanism of the present application;

[0044] Figure 3 It is a schematic view of the cross-sectional structure of the limiting mechanism of the present application;

[0045] Figure 4 It is a schematic view of the Figure 3 It is a schematic view of the enlarged structure at A in the present application;

[0046] Figure 5 It is a schematic view of the filtering mechanism structure of the present application;

[0047] Figure 6 It is a schematic view of the cross-sectional connection structure of the filter installation cover from the first perspective of the present application;

[0048] Figure 7 It is a schematic view of the cross-sectional connection structure of the filter installation cover from the second perspective of the present application;

[0049] Figure 8 It is a schematic view of the Figure 7 It is a schematic view of the enlarged structure at B in the present application;

[0050] Figure 9 It is a schematic view of the cross-sectional connection structure of the filter installation cover from the third perspective of the present application;

[0051] Figure 10 It is a schematic view of the sediment cup structure of the present application;

[0052] Figure 11 It is a schematic view of the cross-sectional structure of the sediment cup of the present application;

[0053] Figure 12 It is a schematic view of the limiting component structure of the present application.

[0054] In the figure: 1, sediment cup; 11, limiting component; 111, mounting seat; 112, pin rod; 113, connecting ring; 114, first elastic member; 12, drain cock; 13, inner bushing; 2, filter installation cover; 21, liquid inlet channel; 22, liquid outlet channel; 23, first limiting groove; 3, filtering mechanism; 31, filter core; 32, communication seat; 33, sealing washer; 4, limiting mechanism; 41, mounting frame; 411, cavity; 412, second limiting groove; 42, lip-shaped sealing ring; 43, elastic element; 431, cylinder body; 4311, air inlet hole; 432, second elastic member; 433, piston; 434, inner rod. DETAILED DESCRIPTION

[0055] With reference to the drawings of the embodiments of the present application, the technical solutions in the embodiments of the present application will be described clearly and completely. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments of the present application. Based on the embodiments of the present application, all the other embodiments obtained by those skilled in the art without creative work fall within the scope of the present application.

[0056] Embodiment one: as shown in the figure, the present application provides an embodiment: a fuel filter sealing structure, comprising a filter mounting cover 2, a sediment cup 1 is installed on the filter mounting cover 2, a filter mechanism 3 is installed on the filter mounting cover 2 inside the sediment cup 1, and the filter mechanism 3 is used for filtering impurities in fuel. Figures 1 to 12

[0057] A limiting mechanism 4 is installed on the sediment cup 1, which is used for sealing the connection between the sediment cup 1 and the filter mounting cover 2, and also for positioning the installation position of the filter mechanism 3 on the filter mounting cover 2.

[0058] Specifically, by setting the limiting mechanism 4, the limiting mechanism 4 is used for sealing the connection between the sediment cup 1 and the filter mounting cover 2 on the one hand, avoiding the gap between the two caused by vehicle vibration and causing fuel leakage or sealing failure;

[0059] The limiting mechanism 4 is used for positioning the installation position of the filter mechanism 3 on the filter mounting cover 2 on the other hand, and the installation of the filter mechanism 3 is positioned by the limiting mechanism 4, effectively inhibiting the relative displacement between the filter mechanism 3 and the filter mounting cover 2 in the vibration environment, so as to ensure the stable filtration of the filter mechanism 3 for fuel impurities, avoid the problem of reduced filtration efficiency caused by loosening, and finally improve the sealing reliability and working stability of the fuel filter in the vibration working condition.

[0060] Embodiment two: in order to realize the stable cooperation and sealing function of the limiting mechanism and the filter mechanism, as shown in the figure, in this embodiment, the limiting mechanism 4 comprises 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 sediment cup 1, so as to ensure the connection stability of the two. Figures 3 to 5

[0061] The limiting mechanism 4 is threadedly connected with the filter mounting cover 2 through the mounting frame 41, and the upper end face of the mounting frame 41 is designed in an open structure and has a cavity 411 inside.

[0062] ​​A plurality of embedding holes are uniformly arranged on the inner circumferential surface of the mounting frame 41, and the elastic element 43 is embedded and mounted in the embedding holes. The elastic element 43 comprises a cylinder 431, and an inner rod 434 passes through the cylinder 431. One end of the inner rod 434 in the cylinder 431 is fixedly provided with a piston 433, the piston 433 is in interference fit with the inner wall of the cylinder 431, a second elastic element 432 is mounted on the piston 433, the second elastic element 432 is used to provide a reset elastic force to the piston 433, one end of the second elastic element 432 away from the piston 433 is elastically connected with the bottom of the cylinder 431, and the end of the cylinder 431 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 to limit the filtering mechanism 3, and the inner rod 434 is self-adaptively extended out through air pressure change, so that the filtering mechanism 3 is radially limited.

[0063] The upper end surface of the mounting frame 41 is fixedly provided with a lip-shaped sealing ring 42 through a clamping groove. The lip-shaped sealing ring 42 is made of oil-resistant rubber material and has good sealing performance. The lip-shaped sealing ring 42 is tightly attached to the lower end surface of the filter mounting cover 2 and is used to seal the connection between the limiting mechanism 4 and the filter mounting cover 2.

[0064] When the lip-shaped sealing ring 42 is pressed, the air pressure in the cavity 411 enters the cylinder 431 through the air inlet hole 4311, pushes the piston 433 to move, and the inner rod 434 is self-adaptively extended out and embedded in the outer circumferential groove of the sealing gasket 33.

[0065] The bottom outer side of the mounting frame 41 is axially provided with a second limiting groove 412.

[0066] The filtering mechanism 3 comprises a filter core 31, and the top of the filter core 31 is fixedly provided with a communication seat 32 through hot melting welding. The communication seat 32 is used to communicate the filter core 31 and the filter mounting cover 2. The communication seat 32 is provided with external threads, and the communication seat 32 is threadedly connected with the filter mounting cover 2. A stepped surface is arranged below the external threads. The sealing gasket 33 is sleeved on the stepped surface. The sealing gasket 33 is made of oil-resistant nitrile rubber material and not only realizes sealing but also provides extension space for the inner rod 434 through the design of the H-shaped structure. The sealing gasket 33 cooperates with the extended inner rod 434 to limit the axial displacement and circumferential rotation of the filtering mechanism 3, improves the connection stability, resists vibration loosening, and maintains the relative position of the filtering mechanism 3 and the filter mounting cover 2 after being connected, thereby improving the connection stability.

[0067] In order to realize precise molding of the filter mounting cover limiting hole and reliable cooperation of the circumferential anti-loosening structure, as shown in Figures 6 to 9 In this embodiment, the filter mounting cover 2 is internally provided with an inlet channel 21 and an outlet channel 22. The inner walls of the inlet channel 21 and the outlet channel 22 are provided with 30°-45° flow guide inclined surfaces and are subjected to inner wall polishing treatment. The flow guide inclined surfaces optimize the fuel flow path, reduce flow resistance, and improve filtering efficiency. The inlet channel 21 and the outlet channel 22 are respectively used for the entry of fuel and the discharge of filtered fuel.

[0068] The bottom inner side of the filter mounting cover 2 is provided with a first limiting groove 23 in the axial direction, the first limiting groove 23 is matched with the opening position of the second limiting groove 412, and the first limiting groove 23 and the second limiting groove 412 are both semi-cylindrical groove bodies, and after being axially aligned, they form a complete cylindrical limiting hole.

[0069] The inner wall of the limiting hole is plated with nickel to enhance wear resistance and corrosion resistance, ensure the gap fit accuracy of the inserted pin 112, and form a circumferential anti-loose structure of “groove body combination + precise insertion” by matching the limiting hole with the pin 112 of the limiting assembly 11 to inhibit the relative rotation of the sediment cup 1 and the filter mounting cover 2 due to vibration.

[0070] Through the symmetrical design of the double-groove body, the uniformity of the circumferential constraint is further improved, and the stability of the connecting structure under dynamic load is ensured.

[0071] In order to improve the corrosion resistance, structural strength of the sediment cup and the automatic anti-loose reliability of the limiting assembly, as shown in Figures 10 to 12 , in this embodiment, an inner bushing 13 is arranged in the sediment cup 1, the inner bushing 13 is designed with a thickness of 1.5-2mm of 304 stainless steel material, and is fixed in the interior of the sediment cup 1 by cold rolling and pressing process, which prevents the corrosion of water and acidic substances in fuel to the sediment cup body and improves the structural strength of the sediment cup 1.

[0072] The sediment cup 1 is provided with a drain plug 12 at the bottom opening, the drain plug 12 is made of H62 brass material, the thread specification is M10x1.25, and is equipped with a fluororubber sealing ring, the inner diameter of the drain port is φ8mm, which ensures the drainage efficiency and reliable sealing.

[0073] The limiting assembly 11 is installed on the sediment cup 1, which is used to inhibit the loosening of the connection between the installed sediment cup 1 and the filter mounting cover 2, the limiting assembly 11 includes a mounting seat 111, the mounting seat 111 is fixed on the shoulder of the outer wall of the sediment cup 1 by argon arc welding process, a pin 112 is slidably installed in the mounting seat 111, a boss structure is arranged in the middle of the pin 112, one end of the pin 112 penetrates through the mounting seat 111 and is inserted into the limiting hole, the pin 112 is made of 45# steel and the surface is plated with chromium, and the end of the pin 112 inserted into the limiting hole is a conical guide head, which is convenient for automatic centering during insertion.

[0074] A first elastic member 114 is sleeved on the pin 112, the first elastic member 114 is a compression spring, the two ends of which abut against the boss and the inner wall of the mounting seat 111 respectively, the pin 112 is inserted into the limiting hole by the elastic force, and automatic anti-loose is realized. A connecting ring 113 is installed on the end of the pin 112 away from the limiting hole, the connecting ring 113 is made of 304 stainless steel round steel and is bent into a ring-shaped handle, the surface is processed with knurled anti-slip pattern, which is suitable for finger holding, improves the convenience of disassembly and assembly operation, facilitates manual pulling of the pin 112 out of the limiting hole, and is convenient for disassembly and maintenance.

[0075] When using the present application, align the communication seat 32 of the filtering mechanism 3 with the threaded interface of the filter mounting cap 2, and screw in clockwise until the sealing washer 33 tightly fits the mating surface of the filter mounting cap 2 and the communication seat 32. At this time, the I-shaped structure of the sealing washer 33 is deformed by radial and axial compression, completing the preliminary sealing of the connection between the filtering mechanism 3 and the filter mounting cap 2; at the same time, the threaded connection of the communication seat 32 provides basic positioning for the filter core 31.

[0076] Align the sediment cup 1 fixedly connected with the limiting mechanism 4 with the bottom of the filter mounting cap 2, hold the sediment cup 1 and rotate it upward, so that the outer peripheral external threads of the mounting bracket 41 of the limiting mechanism 4 are screwed into the bottom of the filter mounting cap 2 synchronously.

[0077] Continue to rotate until the lip-shaped sealing ring 42 completely fits and is deformed under pressure with the lower end surface of the filter mounting cap 2: the lip-shaped sealing ring 42 fills the gap between the mounting bracket 41 and the filter mounting cap 2 through elastic deformation, completing the synchronous sealing of the connection between the sediment cup 1 and the filter mounting cap 2;

[0078] At the same time, due to the pressure on the lip-shaped sealing ring 42, the air pressure in the cavity 411 of the upper end surface of the mounting bracket 41 rises, pushing the inner rod 434 to extend and embed into the outer peripheral groove of the sealing washer 33 of the filtering mechanism 3 through the air inlet hole 4311 of the elastic element 43, and synchronously completing the radial positioning of the filtering mechanism 3, limiting its axial and circumferential displacement.

[0079] It should be noted that before installing the sediment cup 1, the connecting ring 113 of the limiting assembly 11 needs to be pulled to completely retract the pin rod 112 into the mounting seat 111 against the elastic force of the first elastic member 114, so as to avoid the pin rod 112 from hindering the fitting of the sediment cup 1.

[0080] After completing the threaded rotation of the sediment cup 1 and the filter mounting cap 2, loosen the connecting ring 113, and the first elastic member 114 pushes the pin rod 112 to extend axially, with its end part precisely inserted into the limiting hole formed by the synchronous alignment of the first limiting groove 23 on the filter mounting cap 2 and the second limiting groove 412 on the mounting bracket 41 of the limiting mechanism 4, and through the tight fit of the pin rod 112 and the limiting hole, the circumferential relative position of the sediment cup 1 and the filter mounting cap 2 is locked, completing the final locking of anti-vibration and anti-loosening.

[0081] When performing regular maintenance, the water and impurities inside the sediment cup 1 can be discharged through the drain cock 12 at the bottom of the sediment cup 1;

[0082] When disassembling, the above steps are operated in reverse, i.e. pulling the connecting ring 113 to exit the pin rod 112, and unscrewing the threads of the mounting bracket 41 and the communication seat 32, so as to separate the components.

[0083] The foregoing merely illustrates the principles of the application and application of its leading features. This application is not limited to the illustrative embodiments shown and described herein. Rather, this application is capable of operating within a further range of conditions and environments than those specifically described herein, and further modifications can be made without departing from the spirit or scope of the application. Accordingly, the description is to be construed as illustrative only and not restrictive of the broad disclosure or application of the application. The specification and drawings are, accordingly, to be regarded simply as illustrative and with the scope of the application being measured by the appended claims, and not with the specification. No admission is made that any reference constitutes prior art. It is my intent, therefore, to be limited only as appears in the following claims.

[0084] Furthermore, it should be understood that although the description above relates to embodiments, not every embodiment contains only one independent technical solution, and the description above is only for the sake of clarity, and those skilled in the art should understand the description as a whole, and the technical solutions in each embodiment can be appropriately combined to form other embodiments that those skilled in the art can understand.

Claims

1. A fuel filter sealing structure, comprising a filter mounting cover (2), a sedimentation cup (1) mounted on the filter mounting cover (2), and 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 fuel, characterized in that: A limiting mechanism (4) is installed on the sedimentation cup (1). The limiting mechanism (4) is used to seal the connection between the sedimentation cup (1) and the filter mounting cover (2), and is also used to position the filter mechanism (3) on the filter mounting cover (2). The limiting mechanism (4) includes a mounting bracket (41), which has an external thread on its outer periphery. The limiting mechanism (4) is threadedly connected to the filter mounting cover (2) through the mounting bracket (41). The upper end face of the mounting bracket (41) adopts an open structure design and has a cavity (411). The mounting bracket (41) has multiple axially evenly opened embedding holes on its inner periphery and embeds elastic elements (43). The elastic elements (43) are used to limit the filter mechanism (3). The elastic element (43) includes a cylinder (431) and an inner rod (43) inside the cylinder (431). 4) A piston (433) is fixedly installed at one end of the inner rod (434) inside the cylinder (431). The piston (433) is interference-fitted with the inner wall of the cylinder (431). A second elastic element (432) is installed on the piston (433). The second elastic element (432) is used to provide a reset elastic force to the piston (433). The end of the second elastic element (432) away from the piston (433) is elastically connected to the cylinder (431). The end of the cylinder (431) away from the inner rod (434) extends into the cavity (411) and is provided with an air inlet (4311). A lip seal (42) is fixedly installed on the upper end face of the mounting bracket (41). The lip seal (42) is used to seal the connection between the limiting mechanism (4) and the filter mounting cover (2). A second limiting groove (412) is provided on the outer side of the bottom of the mounting bracket (41) along the axial direction.

2. The fuel filter sealing structure according to claim 1, characterized in that, The filter mechanism (3) includes a filter element (31), and a connecting seat (32) is installed on the top of the filter element (31). The connecting seat (32) is used to connect the filter element (31) and the filter mounting cover (2). The connecting seat (32) is provided with an external thread, and the connecting seat (32) is threadedly connected to the filter mounting cover (2). 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 mounting cover (2).

3. The fuel filter sealing structure according to claim 2, characterized in that, The longitudinal section of the sealing gasket (33) adopts an I-shaped structure design. 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 mounting cover (2) are limited.

4. The fuel filter sealing structure according to claim 1, characterized in that, The filter mounting cover (2) is provided with an inlet channel (21) and an outlet channel (22), which are used for the entry of fuel and the discharge of filtered fuel, respectively. The filter mounting cover (2) has a first limiting groove (23) axially formed on the inner side of its bottom.

5. The fuel filter sealing structure according to claim 4, characterized in that, The first limiting groove (23) and the second limiting groove (412) are matched in position, and the first limiting groove (23) and the second limiting groove (412) cooperate to form a limiting hole.

6. The fuel filter sealing structure according to claim 5, characterized in that, The sedimentation cup (1) is provided with an inner liner (13), and a sealed chamber is formed between the inner liner (13) and the sedimentation cup (1); The sedimentation cup (1) has an opening at the bottom and is equipped with a drain plug (12); A limiting component (11) is installed on the sedimentation cup (1). The limiting component (11) is used to prevent the sedimentation cup (1) from becoming loose at the connection with the filter mounting cover (2) after installation.

7. A fuel filter sealing structure according to claim 6, characterized in that, The limiting component (11) includes a mounting base (111), which is fixedly installed on the outer wall of the sedimentation cup (1). A pin (112) is slidably installed inside the mounting base (111). One end of the pin (112) passes through the mounting base (111) and is inserted into the limiting hole. A first elastic element (114) is fitted on the pin (112). The first elastic element (114) is used to push the pin (112) into the limiting hole. A connecting ring (113) is installed on the end of the pin (112) away from the limiting hole. The connecting ring (113) is used to pull the pin (112) out of the limiting hole.

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