Fuel filter-pressure regulator assembly

Abstract

The invention relates to a fuel filter-pressure regulator assembly comprising a fuel filter (1) having a filter housing (10) and a pressure regulator (2) having a regulator housing (20), the filter housing (10) being provided with a first connecting means (3) and the regulator housing being provided with a second connecting means (4), the pressure regulator (2) is detachably and fixedly arranged on the fuel filter through the matching of the first connecting mechanism and the second connecting mechanism; the first connection mechanism and the second connection mechanism are configured such that the fuel filter and the pressure regulator are movable between an assembled position in which the pressure regulator (2) is secured to the fuel filter by engagement of the first connection mechanism (3) and the second connection mechanism (4), and a detachable position in which the pressure regulator (2) is secured to the fuel filter by engagement of the first connection mechanism (3) and the second connection mechanism (4). The first connecting mechanism (3) is disengaged from the second connecting mechanism (4), so that the pressure regulator can be detached from the fuel filter.

Description

Technical Field

[0001] The present invention relates to the field of engine oil supply systems, and in particular to a fuel filter-pressure regulator assembly for an engine oil supply system, wherein the pressure regulator is detachably assembled to the fuel filter. Background Art

[0002] The fuel pump is part of the engine's fuel supply system. The fuel filter is part of the fuel pump, providing clean fuel to the engine. The pressure regulator is also part of the fuel pump, providing the engine with fuel at a stable pressure.

[0003] There are currently two solutions on the market for integrating the pressure regulator into the fuel filter: in the first solution, the pressure regulator is integrated into the fuel filter by secondary injection molding; in the second solution, the pressure regulator is integrated into the fuel filter by laser welding.

[0004] In the first solution, since the pressure regulator is integrated with the fuel filter through secondary injection molding, it has many parts, a complex structure, a long and complex manufacturing process, and high manufacturing costs. The O-ring is externally sealed, and secondary injection molding is prone to leakage. The pressure regulator cannot be disassembled, and if there is a quality problem, it can only be replaced as a whole, which has high after-sales costs. In addition, the pressure regulator cannot be mass-produced alone.

[0005] In the second solution, the pressure regulator is laser welded to the fuel filter. Laser welding requires large investment in welding equipment and is difficult to control welding quality. The pressure regulator cannot be disassembled and can only be replaced as a whole if there is a quality problem, which results in high after-sales costs. It is also impossible to mass-produce the pressure regulator separately. Summary of the invention

[0006] In order to overcome at least one aspect of the above problems, it is necessary to provide a fuel filter-pressure regulator assembly, wherein the pressure regulator is detachably assembled to the fuel filter.

[0007] To this end, the present invention provides a fuel filter-pressure regulator assembly, which includes a fuel filter having a filter housing and a pressure regulator having a regulator housing, wherein the filter housing is provided with a first connecting mechanism, the regulator housing is provided with a second connecting mechanism, and the pressure regulator is detachably fixedly installed to the fuel filter through the cooperation of the first connecting mechanism and the second connecting mechanism; the first connecting mechanism and the second connecting mechanism are configured so that the fuel filter and the pressure regulator can move between an assembly position and a detachable position, in which the pressure regulator is fixed to the fuel filter through the engagement of the first connecting mechanism and the second connecting mechanism, and in the detachable position, the first connecting mechanism is disengaged from the second connecting mechanism, so that the pressure regulator can be removed from the fuel filter.

[0008] According to one embodiment of the invention, the filter housing has a first end, a second end opposite to the first end, and a accommodating cavity extending between the first end and the second end, and the second end has a receptacle suitable for receiving the regulator housing; the first connecting mechanism includes a first axial limiting structure and a first circumferential limiting structure arranged on the receptacle; the second connecting structure includes a second axial limiting structure and a second circumferential limiting structure arranged on the regulator housing; wherein, in the assembly position, the first axial limiting structure is engaged with the second axial limiting structure to limit the axial movement of the pressure regulator relative to the fuel filter, and the first circumferential limiting structure is engaged with the second circumferential limiting structure to limit the circumferential movement of the pressure regulator relative to the fuel filter; in the detachable position, the first axial limiting structure and the second axial limiting structure are disengaged, and the first circumferential limiting structure and the second circumferential limiting structure are disengaged, so that the pressure regulator can be removed from the fuel filter.

[0009] According to one embodiment of the present invention, the receptacle includes a first cylindrical section extending from the end wall of the second end toward the accommodating cavity and a second cylindrical section extending from the end wall away from the accommodating cavity, wherein the diameter of the first cylindrical section is smaller than the diameter of the second cylindrical section; the regulator housing includes an outer housing and an inner housing extending coaxially with the outer housing and fixed to the outer housing, the inner housing having a first inner housing section and a second inner housing section surrounded by the outer housing, wherein the first cylindrical section of the receptacle is configured to be suitable for receiving the first inner housing section of the regulator housing, and the second cylindrical section of the receptacle is configured to be suitable for receiving the outer housing of the regulator housing; the first axial limiting structure includes a plurality of first axial limiting portions arranged on the inner circumferential surface of the second cylindrical section and evenly spaced apart along the circumference thereof; the second axial limiting structure includes a plurality of second axial limiting portions arranged on the outer circumferential surface of the outer housing and evenly spaced apart along the circumference thereof.

[0010] According to a preferred solution of the present invention, the first axial limiting structure includes four first axial limiting portions, each of which is configured as a protrusion protruding inward from the inner circumferential surface of the second cylindrical section; the second axial limiting structure includes four second axial limiting portions, each of which is configured as a convex portion protruding outward from the outer circumferential surface of the outer shell; wherein the circumferential length of the convex portion is less than the circumferential spacing between two adjacent protrusions.

[0011] According to a preferred embodiment of the present invention, the first circumferential limiting structure includes a first circumferential limiting portion arranged on the outer end surface of the second cylindrical section; and the second circumferential limiting structure includes a circumferential limiting member arranged at one end of the outer shell body away from the first inner shell body section.

[0012] Preferably, the circumferential limit member may include a first arm extending parallel to the axial direction of the outer shell and a second arm extending from the end of the first arm and perpendicular to the first arm, wherein a recess open to the back of the inner shell is formed on the second arm; the first circumferential limit portion is constructed as a convex portion formed on the outer end surface of the second cylindrical section, and the convex portion can engage in the recess.

[0013] In a preferred embodiment of the present invention, a first boss portion is provided on the outer circumferential surface of the first inner shell section, and an annular flange is provided on the inner circumferential surface of the first cylindrical section. When the first inner shell section is engaged in the first cylindrical section, an annular gap suitable for accommodating an O-ring is formed between the first boss portion and the annular flange.

[0014] According to a preferred embodiment of the present invention, a second shoulder portion is provided on the inner circumferential surface of the second cylindrical section, and in the assembly position, the raised portion of the second axial limiting structure is engaged between the second shoulder portion and the corresponding protrusion of the first axial limiting structure so as to limit the axial movement of the regulator housing relative to the filter housing.

[0015] Advantageously, a process groove is further provided at one end of the outer shell body away from the first inner shell body section, and the process groove is used for inserting a tool suitable for rotating the pressure regulator.

[0016] In the present invention, the fuel filter is preferably a lifetime filter; the filter housing, the regulator housing and the circumferential limiter can all be molded from plastic material, and preferably the circumferential limiter and the regulator housing are integrally molded.

[0017] Due to the adoption of the above technical scheme, the present invention can produce at least one of the following beneficial technical effects: the structure is simple and reliable, and the fuel filter and the pressure regulator adopt a detachable connection design such as a buckle design, which can reduce the number of parts, reduce mold and production costs; the buckle design saves the investment in laser welding equipment, and meets the requirements of customers, the cost is controllable, and the quality risk is low; and due to the adoption of a detachable buckle design, when the pressure regulator has quality problems, it can be easily replaced to avoid overall scrapping and reduce after-sales costs; this connection design can reduce repeated investment in the production line of the pressure regulator, and the pressure regulator can be mass-produced in a centralized manner, reducing costs and supplying different regions or countries; an improved sealing structure design is provided, and the sealing part is composed of the fuel filter housing and the pressure regulator housing, and an axial seal is adopted, which can not only ensure the filter sealing requirements, but also avoid fuel leakage. Not only is the mold structure simple, but also the pressure regulator can be integrated into the fuel filter at a low cost. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Further features and advantages of the present invention will become more apparent from the following detailed description with reference to the accompanying drawings:

[0019] Figure 1 A perspective view showing an embodiment of a fuel filter-pressure regulator assembly according to the present invention;

[0020] Figure 2 Shows Figure 1 A cross-sectional view of the fuel filter-pressure regulator assembly is shown;

[0021] Figure 3 A perspective view of a fuel filter according to the present invention;

[0022] Figure 4 for Figure 3 A cross-sectional view of a filter housing of a fuel filter is shown;

[0023] Figure 5 For assembling the pressure regulator according to the present invention to Figure 4 A cross-sectional view of the filter housing is shown;

[0024] Figure 6 for Figure 5 A magnified view of part A in FIG.

[0025] Figure 7 A perspective view of an embodiment of a pressure regulator according to the present invention;

[0026] Figure 8 for Figure 7 A cross-sectional view of the pressure regulator shown;

[0027] Fig. 9 for Figure 7A perspective view of a regulator housing of the pressure regulator shown;

[0028] Fig.10 for Fig. 9 A cross-sectional view of the regulator housing is shown;

[0029] Fig.11 is a schematic diagram of the pressure regulator in a removable position relative to the fuel filter; and

[0030] Fig.12 Schematic diagram of the pressure regulator in the assembled position relative to the fuel filter. DETAILED DESCRIPTION

[0031] The fuel filter-pressure regulator assembly implemented in accordance with the present invention will be described below with reference to the accompanying drawings and by way of example. In the following description, many specific details are set forth in order to provide a more comprehensive understanding of the present invention to those skilled in the art. However, it will be apparent to those skilled in the art that the present invention may be implemented without some of these specific details. Furthermore, it should be understood that the present invention is not limited to the specific embodiments described. Rather, it is contemplated that the present invention may be implemented with any combination of the following features and elements, whether or not they relate to different embodiments.

[0032] Figure 1 An exemplary embodiment of a fuel filter-pressure regulator assembly 100 according to the present invention is shown. The fuel filter-pressure regulator assembly 100 comprises a fuel filter 1 and a pressure regulator 2 detachably and sealingly fixedly assembled (or integrated) to the fuel filter 1. Here, the fuel filter 1 is preferably a lifetime filter.

[0033] Figure 2 for Figure 1sectional view of a fuel filter-pressure regulator assembly shown in FIG. As can be seen from the figure, the fuel filter 1 comprises a filter housing 10 having a first end 11, a second end 12 and a receiving chamber 13 extending between the first end and the second end, a cover plate 101 located at the first end 11 and a filter element 102 arranged in the receiving chamber. A receiving seat 5 is provided at the second end 12 of the filter housing 10, and the receiving seat is used to receive the pressure regulator 2, especially the regulator housing 20, and a first connecting mechanism 3 is provided at the receiving seat 5. The cover plate 101 is provided with a fuel inlet and a fuel outlet in fluid communication with the receiving chamber 13. The pressure regulator 2 comprises a regulator housing 20, a rear cover 23, a compression spring 24 and a valve core 25 located in a chamber formed by the rear cover. The regulator housing 20 is provided with a second connecting mechanism 4 that can cooperate with the first connecting mechanism 3. The pressure regulator 2 is detachably fixedly mounted to the fuel filter 1 by the engagement of the first connecting mechanism 3 with the second connecting mechanism 4. In addition, a sealing structure is provided between the filter housing 10 and the regulator housing 20 for sealingly mounting the pressure regulator 2 to the fuel filter 1 to avoid fuel leakage.

[0034] See also Figure 3 and Figure 4 , shows an embodiment of the fuel filter 1 according to the present invention, in which the receptacle 5 is formed at the second end 12 of the filter housing 10, and includes a first cylindrical section 51 extending from the end wall 120 of the second end toward the accommodating chamber 13, and a second cylindrical section 52 extending from the end wall away from the accommodating chamber 13, wherein the diameter of the first cylindrical section is smaller than the diameter of the second cylindrical section, thereby forming a stepped chamber for accommodating the pressure regulator 2.

[0035] Figure 7 and Figure 8 An embodiment of a pressure regulator 2 is shown, Fig. 9 and Fig.10 An embodiment of the regulator housing 20 is shown. As can be seen from the figure, the regulator housing 20 includes an outer housing 21 and an inner housing 22, the inner housing and the outer housing are fixedly connected to each other and extend coaxially, and the inner housing defines a fluid channel 30 suitable for fluid communication with the accommodating chamber 13. Preferably, the inner housing and the outer housing can be integrally injection molded from a plastic material. In this embodiment, the inner housing 22 has a first inner housing section 221 and a second inner housing section 222 surrounded by the outer housing, and the dimensions of the regulator housing 20 and the receptacle 5 are selected so that the first inner housing section 221 of the regulator housing 20 can be inserted into the first cylindrical section 51 of the receptacle 5, and the outer housing 21 of the regulator housing 20 can be inserted into the second cylindrical section 52 of the receptacle 5 (see Figure 5 and Figure 6 ).

[0036] In an embodiment of the present invention, advantageously, the first connecting mechanism 3 can be configured to include a first axial limiting structure 31 and a first circumferential limiting structure 32 arranged on the receptacle 5; the second connecting mechanism 4 can be configured to include a second axial limiting structure 41 and a second circumferential limiting structure 42 arranged on the regulator housing 20.

[0037] In the illustrated embodiment, the first axial limiting structure 31 may be configured to include a plurality of first axial limiting portions, such as four first axial limiting portions, which are arranged on the inner circumferential surface of the second cylindrical section 52 and are evenly spaced apart along the circumference thereof. Figure 3 For example, each first axial stopper may be configured as a protrusion protruding inwardly from the inner circumference of the second cylindrical section 52. Accordingly, the second axial stopper structure 41 may be configured to include a plurality of second axial stoppers, such as four second axial stoppers, disposed on the outer circumference of the outer shell 21 and evenly spaced apart along the circumference thereof. Figure 7 and Fig. 9 Each second axial limiting portion is configured in the form of a protrusion protruding outward from the outer circumferential surface of the outer shell 21, wherein the circumferential length of the protrusion is less than the circumferential spacing between two adjacent protrusions, so that when the pressure regulator 2 is inserted into the fuel filter 2, each protrusion on the outer circumferential surface of the outer shell 21 can pass between the corresponding two protrusions on the second cylindrical section 52, and then by rotating the regulator housing 20, the protrusion and the protrusion can be engaged, thereby limiting the axial movement of the pressure regulator 2 relative to the fuel filter 1. It should be understood that the specific structure and number of the protrusions and protrusions shown in the figures are only exemplary and preferred, and can be changed and modified as needed, which is also covered within the scope of the present application.

[0038] See especially Figure 3 The first circumferential limiting structure 32 may include a first circumferential limiting portion disposed on the outer end surface 50 of the second cylindrical section 52, such as a convex portion 32 formed on the outer end surface of the second cylindrical section 52. Fig. 9 and Fig.10The second circumferential limiting structure 42 may include a circumferential limiting member 43 disposed at one end of the outer shell 21 away from the first inner shell section 221, the circumferential limiting member 43 including a first arm 431 extending parallel to the axial direction of the outer shell 21 and a second arm 432 extending from the end of the first arm and perpendicular to the first arm, wherein a recess open to the inner shell 22 is formed on the second arm, and the protrusion can engage in the recess. And the circumferential limiting member 43 is preferably integrally injection molded with the regulator housing 20 by plastic material. The circumferential limiting member is made of plastic material, which has the advantage that the engagement between the recess and the protrusion can be disengaged by applying a thrust to it, especially a thrust toward the inner shell. As an alternative, the first circumferential limiting portion can also be constructed in the form of a recess, and the recess on the second arm can be replaced by a corresponding protrusion, which is also covered within the scope of the present application.

[0039] Advantageously, in the fuel filter-pressure regulator assembly 100 of the present invention, the first connection mechanism 3 and the second connection mechanism 4 are configured so that the fuel filter 1 and the pressure regulator 2 can rotate between an assembly position and a detachable position, in which the first axial limiting structure 31 is engaged with the second axial limiting structure 41 to limit the axial movement of the pressure regulator 2 relative to the fuel filter 1, and the first circumferential limiting structure 32 is engaged with the second circumferential limiting structure 42 to limit the circumferential movement of the pressure regulator relative to the fuel filter. When disassembly is required, the second arm 432 of the circumferential limiting member can be pushed from the outer shell 21 toward the inner shell 22, thereby releasing the engagement between the protrusion formed on the outer end surface of the second cylindrical section 52 and the recess on the second arm 432, and then the pressure regulator 2 can be rotated relative to the fuel filter 1 to the detachable position in which the first axial limiting structure 31 and the second axial limiting structure 41 are disengaged, so that the pressure regulator can be removed from the fuel filter.

[0040] See also Fig.10 In a preferred embodiment of the pressure regulator 2, a first convex shoulder 220 is provided on the inner circumference of the first inner housing section 221 of the regulator housing 20. Figure 4 , an annular flange 510 is provided on the inner circumferential surface of the first cylindrical section 51 of the receptacle 5 of the filter housing 10 of the fuel filter 1. Figure 6When the pressure regulator 2 is assembled to the fuel filter 1, that is, when the first inner housing section 221 is engaged in the first cylindrical section 51, an annular gap suitable for receiving the O-ring 6 is formed between the first shoulder 220 and the annular flange 510, thereby achieving a sealed connection between the pressure regulator 2 and the fuel filter 1. Moreover, in this sealing scheme, the axial sealing is performed by the cooperation of the filter housing and the regulator housing with the O-ring, which can not only ensure the sealing requirements of the fuel filter and avoid fuel leakage; and the mold structure is simple, the O-ring has a low temperature resistance grade, and the size is small, which reduces the cost while meeting the quality requirements of customers.

[0041] Advantageously, see again Figure 4 A second convex shoulder 520 is further provided on the inner circumferential surface of the second cylindrical section 52 of the receptacle 5, and a space suitable for receiving a corresponding protrusion constituting the second axial limiting structure 41 is formed between the second convex shoulder 520 and each protrusion of the first axial limiting structure 31, so that the protrusion is snap-engaged between the corresponding protrusion and the second convex shoulder 520 to limit the axial movement of the regulator housing 20 relative to the filter housing 10. Alternatively, each axial limiting portion of the first axial limiting structure 31 can also be configured in the form of two parallel convex ribs, and a space suitable for receiving a corresponding protrusion of the second axial limiting structure 41 is formed between the two convex ribs to achieve the engagement of the second axial limiting structure 41 with the first axial limiting structure 31.

[0042] See again Figure 7 and Fig. 9 In order to facilitate the assembly and disassembly between the pressure regulator 2 and the fuel filter 1, a process groove 210 is further provided at one end of the outer shell 21 away from the first inner shell section 221, and the process groove is used to insert a tool (not shown) suitable for rotating the pressure regulator 2.

[0043] The following is based on Fig.11 and Fig.12 The assembly and disassembly process of the fuel filter-pressure regulator assembly 100 according to the present invention is briefly described as follows: first, the regulator housing 20 of the pressure regulator 2 is inserted into the receptacle 5 at one end of the filter housing 10 of the fuel filter 1, and then the tool is inserted into the process groove 210 and pressed to a stop position along the axial direction of the regulator housing, that is, the outer housing 21 of the regulator housing 20 abuts against the end wall 120 of the second end 12 of the filter housing 10. At this time, the pressure regulator 2 is in a detachable position relative to the fuel filter 1 (such as Fig.11Then, the tool inserted into the process groove 210 is used to rotate the pressure regulator 2 in a counterclockwise direction, so that the first axial limiting structure 31 is engaged with the second axial limiting structure 41 to prevent the pressure regulator 2 from axially moving relative to the fuel filter 1, and the first circumferential limiting structure 32 is engaged with the second circumferential limiting structure 42 to prevent the pressure regulator 2 from circumferentially moving relative to the fuel filter 1, thereby fixing the pressure regulator 2 to the fuel filter 1, that is, the pressure regulator 2 is in an assembly position relative to the fuel filter 1 (as shown in FIG. Fig.12 shown).

[0044] When the pressure regulator needs to be disassembled: first, push the second arm 432 of the circumferential limit member 43 toward the inner shell 22 of the pressure regulator 2 to disengage the recess 42 on the second arm from the protrusion 32 on the outer end surface 520 of the second cylindrical section 52 of the receptacle 5; then, insert the tool into the process groove 210, and rotate the pressure regulator 2 in a clockwise direction to disengage the first axial limit structure 31 from the second axial limit structure 41; finally, pull the pressure regulator 2 out of the fuel filter 1.

[0045] Although the present invention has been disclosed as above with preferred embodiments, the present invention is not limited thereto. Any combination, change and modification made by any person skilled in the art without departing from the spirit and scope of the present invention should be included in the protection scope of the present invention, and therefore the protection scope of the present invention should be subject to the scope defined by the claims.

Claims

1. A fuel filter-pressure regulator assembly, comprising a fuel filter (1) having a filter housing (10) and a pressure regulator (2) having a regulator housing (20), wherein: The filter housing (10) is provided with a first connecting mechanism (3), the regulator housing (20) is provided with a second connecting mechanism (4), and the pressure regulator (2) is detachably fixedly mounted to the fuel filter (1) through the cooperation between the first connecting mechanism and the second connecting mechanism; The first connecting mechanism and the second connecting mechanism are configured so that the fuel filter and the pressure regulator can move between an assembled position and a detachable position. In the assembled position, the pressure regulator (2) is fixed to the fuel filter by the engagement of the first connecting mechanism (3) with the second connecting mechanism (4). In the detachable position, the first connecting mechanism (3) is disengaged from the second connecting mechanism (4), so that the pressure regulator can be detached from the fuel filter.

2. The fuel filter-pressure regulator assembly according to claim 1, wherein: The filter housing (10) has a first end (11), a second end (12) opposite to the first end (11), and a receiving cavity (13) extending between the first end and the second end, wherein the second end (12) has a receptacle (5) suitable for receiving the regulator housing (20); The first connection mechanism (3) comprises a first axial limiting structure (31) and a first circumferential limiting structure (32) arranged on the receptacle (5); The second connection structure (4) comprises a second axial limiting structure (41) and a second circumferential limiting structure (42) arranged on the regulator housing (20); In the assembly position, the first axial limiting structure (31) is engaged with the second axial limiting structure (41) to limit the axial movement of the pressure regulator relative to the fuel filter, and the first circumferential limiting structure (32) is engaged with the second circumferential limiting structure (42) to limit the circumferential movement of the pressure regulator relative to the fuel filter; in the detachable position, the first axial limiting structure (31) and the second axial limiting structure (41) are disengaged, and the first circumferential limiting structure (32) and the second circumferential limiting structure (42) are disengaged, so that the pressure regulator can be removed from the fuel filter.

3. The fuel filter-pressure regulator assembly according to claim 2, wherein: The receptacle (5) comprises a first cylindrical section (51) extending from the end wall (120) of the second end toward the accommodating cavity (13) and a second cylindrical section (52) extending from the end wall away from the accommodating cavity (13), wherein the diameter of the first cylindrical section is smaller than the diameter of the second cylindrical section; The regulator housing (20) comprises an outer housing (21) and an inner housing (22) extending coaxially with the outer housing and fixed to the outer housing, wherein the inner housing (22) has a first inner housing section (221) and a second inner housing section (222) surrounded by the outer housing, wherein the first cylindrical section of the receptacle (5) is configured to be suitable for receiving the first inner housing section (221) of the regulator housing (20), and the second cylindrical section of the receptacle (5) is configured to be suitable for receiving the outer housing (21) of the regulator housing (20); The first axial limiting structure (31) includes a plurality of first axial limiting portions which are arranged on the inner circumferential surface of the second cylindrical section (52) and are evenly spaced apart along its circumference; the second axial limiting structure (41) includes a plurality of second axial limiting portions which are arranged on the outer circumferential surface of the outer shell (21) and are evenly spaced apart along its circumference.

4. The fuel filter-pressure regulator assembly according to claim 3, wherein: The first axial limiting structure (31) includes four first axial limiting portions, each of which is configured as a protrusion protruding inwardly from the inner circumferential surface of the second cylindrical section (52); the second axial limiting structure (41) includes four second axial limiting portions, each of which is configured as a convex portion protruding outwardly from the outer circumferential surface of the outer shell (21); wherein the circumferential length of the convex portion is less than the circumferential spacing between two adjacent protrusions.

5. The fuel filter-pressure regulator assembly according to claim 3 or 4, wherein: The first circumferential limiting structure (32) comprises a first circumferential limiting portion arranged on the outer end surface of the second cylindrical section (52); and The second circumferential limiting structure (42) comprises a circumferential limiting member (43) arranged at an end of the outer shell (21) away from the first inner shell section (221).

6. The fuel filter-pressure regulator assembly according to claim 5, wherein: The circumferential stopper (43) comprises a first arm (431) extending parallel to the axial direction of the outer shell (21) and a second arm (432) extending from the end of the first arm and perpendicular to the first arm, wherein a recess is formed on the second arm and is open facing away from the inner shell (22); The first circumferential limiting portion is configured as a convex portion formed on the outer end surface (520) of the second cylindrical section (52), and the convex portion can be engaged in the recess.

7. The fuel filter-pressure regulator assembly according to claim 5, wherein: A first boss portion (220) is provided on the outer circumferential surface of the first inner shell section (221), and an annular flange (510) is provided on the inner circumferential surface of the first cylindrical section (51). When the first inner shell section (221) is engaged in the first cylindrical section (51), an annular gap suitable for receiving an O-ring (6) is formed between the first boss portion (220) and the annular flange (510).

8. The fuel filter-pressure regulator assembly according to claim 7, wherein: A second boss portion (520) is provided on the inner circumferential surface of the second cylindrical section (52), and in the assembly position, the protrusion of the second axial limiting structure (41) is engaged between the second boss portion (520) and the corresponding protrusion of the first axial limiting structure (31) so as to limit the axial movement of the regulator housing (20) relative to the filter housing (10).

9. The fuel filter-pressure regulator assembly according to claim 5, wherein: A process groove (210) is also provided at one end of the outer shell (21) away from the first inner shell section (221), wherein the process groove is used for inserting a tool suitable for rotating the pressure regulator (2).

10. The fuel filter-pressure regulator assembly according to claim 5, wherein: The fuel filter is a lifetime filter; the filter housing (10), the regulator housing (20) and the circumferential limiter are all molded from plastic material, and the circumferential limiter and the regulator housing are integrally molded.

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