A filter paper structure for filtration and an integrated modular fuel filter assembly

Abstract

The utility model discloses a filter paper structure and integrated modular fuel filter assembly for filtering, which aims to solve the technical problems existing in the prior art. The filter paper structure comprises first and second high-fold paper structures arranged alternately, and the first and second high-fold paper structures are intermittently and alternately distributed around the filter core shaft. The integrated modular fuel filter assembly comprises a main housing assembly forming an L-shaped oil path; a housing upper cover assembly sealingly connected to the lower end portion and the upper end portion of the main housing assembly; a filter core assembly coaxially located in the space formed by the main housing assembly and the housing upper cover assembly; the filter core assembly comprises at least filter layers of the first and second high-fold paper structures arranged alternately; and a water cup assembly sealingly connected to the upper end portion and the lower end portion of the main housing assembly, and the water cup assembly comprises at least a third heater, and a ceramic heating rod of the third heater extends from the bottom of the main housing to the upper portion for heating.

Description

Technical Field

[0001] This utility model belongs to the field of filtration technology, specifically relating to a filter paper structure for filtration and an integrated modular fuel filter assembly. Background Technology

[0002] See Figures 1-3 In the existing technology, whether it is an air filter or a liquid filter, such as an automotive air filter or a fuel filter, the filter element usually adopts an equal-height folded paper structure design, that is, all the folds have the same height h and are evenly arranged in a limited space.

[0003] While existing filter paper structures have a simple manufacturing process, they suffer from the following technical problems: Because all folds are of the same height, the total surface area of ​​the filter paper in the filter cartridge is limited by the internal space of the filter housing. Within the same volume, traditional equal-height folding structures cannot maximize space utilization, failing to fully utilize the limited space to maximize the filter paper area. This results in a lower effective filtration area, affecting the filter cartridge's dirt-holding capacity and filtration efficiency, leading to low filtration efficiency. Specifically, within the same structural space, the existing filter cartridge folding structure has a lower filter paper area, resulting in shorter maintenance intervals. This leads to increased maintenance frequency, higher labor costs, and ultimately, higher maintenance costs.

[0004] The existing fuel filter consists of a main housing assembly 1, a filter element assembly 2, a housing cover assembly 3, and a water collection cup assembly 4. It is used to filter impurities and moisture from diesel fuel. The main housing assembly 1 is partially sealed by a first O-ring 9. A first heater 5 is installed on the upper part of the main housing assembly 1, and a second heater 6 is installed inside the water collection cup assembly 4. (See also...) Figure 4 The arrow indicates the fuel line route, which is a Z-shaped fuel line. Fuel enters the sealed cavity between the main housing assembly 1, filter element assembly 2, and housing cover assembly 3 through the inlet 7 of the main housing assembly 1. After being filtered by the filter element assembly 2 to remove impurities and moisture, it enters the sealed cavity formed by the main housing assembly 1, filter element assembly 2, and water collection cup assembly 3. Finally, it flows out from the outlet 8 of the main housing assembly 1 and supplies the next fuel supply module. The first heater 5 and the second heater 6 are used to defrost the fuel wax inside the fuel filter in winter and to defrost the water accumulated in the water collection cup assembly, thus ensuring normal vehicle operation. However, existing fuel filters have the following problems:

[0005] 1. The complex oil circuit design and high initial resistance result in high fuel consumption;

[0006] 2. Inadequate sealing structure design leads to high production costs;

[0007] 3. The defrosting heater has an unreasonable structural design. The dual-heater structure of the first heater 5 and the second heater 6 results in high cost. In the single heating mode, the first heater 5 of the upper heating structure cannot defrost the water in the water cup, and the second heater 6 of the lower heating structure has poor heating effect and slow defrosting speed. Utility Model Content

[0008] The purpose of this invention is to propose a filter paper structure for filtration and an integrated modular fuel filter assembly, which solves the problems of low filter paper area, low filtration efficiency, short maintenance intervals, high fuel consumption, high production costs, and unreasonable design of the defrosting heater structure in the existing technology.

[0009] To achieve the above objectives, the present invention provides a filter paper structure for filtration, comprising an alternating first fold height folding structure and a second fold height folding structure, wherein the first fold height folding structure and the second fold height folding structure are intermittently and alternately distributed around the filter core axis.

[0010] The first folding height of the paper-folding structure is h1, and the second folding height of the paper-folding structure is h2, and h2 satisfies: h1 < h2 < 2h1.

[0011] The first and second fold height paper-folding structures are evenly distributed around the circumference.

[0012] An integrated modular fuel filter assembly including a filter paper structure for filtering includes:

[0013] A main housing assembly, the main housing assembly including at least a main housing, forming an L-shaped oil passage;

[0014] A housing cover assembly is sealed to the lower end of the main housing assembly and to the upper end of the main housing assembly. The housing cover assembly includes at least an inverted U-shaped housing cover. The flange face of the housing cover is connected to the threaded upper flange face of the main housing by a second fastening screw.

[0015] A filter element assembly is coaxially located within the space formed by the main housing assembly and the housing cover assembly. The lower end of the filter element assembly is sealed to the inside of the main housing assembly. The filter element assembly includes at least a filter layer with alternating first folded paper structure and second folded paper structure.

[0016] The water collection cup assembly is sealed to the upper end and the lower end of the main housing assembly, and the water collection cup assembly includes at least a third heater, the ceramic heating rod of the third heater extending from the bottom of the main housing to the upper part for heating.

[0017] The main housing includes:

[0018] The upper filter chamber contains the filter element assembly, and the bottom of the filter chamber is provided with an oil inlet threaded hole.

[0019] An oil outlet channel is located at the lower part of the filter chamber, and the two ends of the oil outlet channel are provided with oil outlet process threaded holes as oil outlets;

[0020] And a one-way valve mounting hole connecting the filter chamber and the oil outlet channel.

[0021] The main housing assembly also includes:

[0022] The first plug is installed in the oil inlet process thread hole of the main housing by means of threaded connection and sealed by the first combination gasket;

[0023] The second plug is installed in the process threaded hole of the oil outlet of the main housing by means of threaded connection and sealed by the second combination gasket;

[0024] The third plug is installed in the internal threaded holes of the electric pump inlet and outlet of the main housing via a threaded connection and is sealed by a third combination gasket.

[0025] A one-way valve plate, wherein the one-way valve plate and the one-way valve seat are combined together by a snap-fit ​​method and are interference-fitted and fixed in the one-way valve mounting hole;

[0026] An exhaust duct, the lower end of which is installed in the main housing via a threaded connection, with thread sealant applied to the threaded connection.

[0027] The electric pump is connected to the threaded side flange of the main housing by a first fastening screw and sealed by a second O-ring and a third O-ring. The oil inlet of the electric pump is connected to the lower end of the exhaust pipe, and the oil outlet of the electric pump is connected to the oil outlet channel of the main housing.

[0028] The housing cover assembly also includes:

[0029] A venting knob that rotates with the threaded hole cover at the center of the upper end of the housing cover;

[0030] A sixth O-ring is provided between the venting knob and the housing cover;

[0031] A compression spring is coaxially arranged with the venting knob. The upper end of the compression spring is interference-fitted with the inner surface of the upper end of the housing cover, and the lower end is in contact with the upper end of the filter element assembly and is in a compressed state.

[0032] The sealing connection between the lower end of the housing cover assembly and the upper end of the main housing assembly is specifically as follows: the lower end of the housing cover is inserted into the upper end of the main housing, and a seventh O-ring is provided at the mating point between the housing cover and the main housing.

[0033] The filter element assembly includes a hydrophobic mesh, a central tube, a support layer, and a filter layer arranged coaxially from the inside out. The upper end of the hydrophobic mesh, central tube, support layer, and filter layer are bonded to the filter element top cover, and the lower end is bonded to the filter element bottom cover. The filter element bottom cover is sealed to the inner wall of the main housing through a fourth O-ring and a fifth O-ring. The housing top cover assembly, the main housing assembly, and the outer side of the filter layer of the filter element assembly form a pre-filtration chamber. The inner side of the filter layer of the filter element assembly, the outer side of the hydrophobic mesh of the filter element assembly, the main housing assembly, and the water collection cup assembly form a water filtration chamber. The inner side of the hydrophobic mesh of the filter element assembly and the main housing assembly form a clean fuel chamber for removing water and impurities. The oil inlet threaded hole of the main housing is correspondingly located in the pre-filtration chamber, and the one-way valve mounting hole connects the clean fuel chamber and the oil outlet channel.

[0034] The water collection cup assembly also includes:

[0035] The water collection cup has its flange face connected to the threaded lower flange face of the main housing by a fourth fastening screw. The third heater is fixed inside the water collection cup by a third fastening screw. An eighth O-ring is provided at the mating point between the third heater and the hole wall provided on the outer wall of the water collection cup.

[0036] And a water level alarm, which is installed in the threaded hole of the water collection cup by means of a threaded connection and sealed by a rectangular sealing ring;

[0037] The sealing connection between the upper end of the water collection cup assembly and the lower end of the main housing assembly is specifically as follows: the upper end of the water collection cup is inserted into the lower end of the main housing, and a ninth O-ring is provided at the mating point between the water collection cup and the main housing.

[0038] The beneficial effects of the present utility model are as follows: A filter paper structure for filtration in the present utility model has an intermittent equal-height layout. By increasing the height of some folded papers, the total filter paper area is increased. While keeping the height of some folded papers unchanged, that is, h1 = h, the height of other folded papers is increased to h2, where h1 < h2 < 2h1. In this way, the total filter paper area is increased within the same space. Due to the increase in the filter paper area, the filtering capacity is improved, thereby extending the service life of the filter element and reducing the replacement frequency. This design ingeniously utilizes the existing space and significantly improves the filtering efficiency without increasing the overall volume of the filter. It can be applied to air filters or liquid filters. The integrated modular fuel filter assembly of the present utility model optimizes the oil circuit design, adopts a coaxial integrated layout and a one-way valve plate structure, shortens the fuel flow path, reduces the initial resistance, and thus reduces fuel consumption; through modular sealing design, simplifies the connection method between the main housing, the upper cover of the housing, and the water accumulation cup, adopts an inserted O-ring seal and standardized thread fastening, reduces the number of parts, and lowers the production cost; in the prior art, two heaters are arranged at different positions to locally heat key parts and then thaw through heat radiation, and two sets of controllers are required for temperature control. The present utility model has a set of controller and a ceramic heating rod. The ceramic heating rod directly penetrates the entire filter from the bottom, cancels the traditional double-heater design, improves the heater layout, and only sets a third heater in the water accumulation cup. Combining with the heat conduction structure of the ceramic heating rod, synchronous and efficient heating of fuel and water accumulation is achieved, reducing energy consumption and cost; at the same time, it integrates functions of an electric pump, automatic exhaust, and water level alarm, enhancing the system reliability and maintenance convenience. The overall solution significantly reduces the production cost and operation energy consumption while ensuring the filtering performance, and is especially suitable for the low-temperature working conditions of diesel engines. BRIEF DESCRIPTION OF THE DRAWINGS

[0039] Figure 1 is the front view of the filter paper structure in the prior art;

[0040] Figure 2 is the top view of the filter paper structure in the prior art;

[0041] Figure 3 is the schematic diagram of the unfolded state of the filter paper structure in the prior art;

[0042] Figure 4 is the schematic diagram of the structure of the fuel filter assembly in the prior art;

[0043] Figure 5 is the front view of the filter paper structure for filtration of the present utility model;

[0044] Figure 6 is the top view of the filter paper structure for filtration of the present utility model;

[0045] Figure 7This is a schematic diagram of the unfolded structure of the filter paper for filtration according to this utility model;

[0046] Figure 8 This is an exploded view of the integrated modular fuel filter assembly of this utility model.

[0047] Figure 9 This is a frontal view of the overall structure of the integrated modular fuel filter assembly of this utility model.

[0048] Figure 10 This is a side view of the overall structure of the integrated modular fuel filter assembly of this utility model.

[0049] Figure 11 This is a top view of the main housing assembly in the integrated modular fuel filter assembly of this utility model;

[0050] Figure 12 for Figure 11 AA section view;

[0051] Figure 13 This is a rear view of the main housing assembly in the integrated modular fuel filter assembly of this utility model;

[0052] Figure 14 for Figure 13 BB section view;

[0053] Figure 15 for Figure 13 The C-direction view;

[0054] Figure 16 This is a schematic diagram of the housing cover assembly in the integrated modular fuel filter assembly of this utility model;

[0055] Figure 17 This is a schematic diagram of the filter element assembly in the integrated modular fuel filter assembly of this utility model;

[0056] Figure 18 This is a schematic diagram showing the position of the filter layer in the filter element assembly of the integrated modular fuel filter assembly of this utility model;

[0057] Figure 19 This is a schematic diagram of the water collection cup assembly in the integrated modular fuel filter assembly of this utility model;

[0058] The components include: 1. Main housing assembly, 101. Main housing, 102. Filter chamber, 103. Oil outlet channel, 104. One-way valve mounting hole, 105. Oil inlet process thread hole, 106. Oil outlet process thread hole, 107. Electric pump oil inlet, 108. Electric pump oil outlet, 109. First plug, 110. First combined washer, 111. Second plug, 112. Second combined washer, 113. Third plug, 114. Third combined washer, 115. One-way valve plate, 116. One-way valve seat, 117. Exhaust duct, 118. Electric pump, 119. First fastening screw, 120. Second O-ring seal, 121. Third O-ring seal; 2. Filter element assembly, 201. Filter layer, 202. Support layer, 203. Central tube, 204. Drainage screen, 20 5. Filter element top cover, 206. Filter element bottom cover, 207. Fourth O-ring seal, 208. Fifth O-ring seal, 3. Housing top cover assembly, 301. Housing top cover, 302. Second fastening screw, 303. Venting knob, 304. Sixth O-ring seal, 305. Compression spring, 306. Seventh O-ring seal, 4. Water collection cup assembly, 401. Third heater, 402. Water collection cup, 403. Fourth fastening screw, 404. Third fastening screw, 405. Eighth O-ring seal, 406. Water level alarm, 407. Rectangular seal, 408. Ninth O-ring seal, 5. First heater, 6. Second heater, 7. Oil inlet, 8. Oil outlet, 9. First O-ring seal, 10. First folded paper structure, 11. Second folded paper structure. Detailed Implementation

[0059] The embodiments of this utility model will be further described below with reference to the accompanying drawings.

[0060] See Figure 5-7 The filter paper structure of this utility model includes an alternating first fold height folding structure 10 and a second fold height folding structure 11, which are intermittently and alternately distributed around the filter core axis.

[0061] The first folding height 10 has a folding height of h1, and the second folding height 11 has a folding height of h2, and h2 satisfies: h1 < h2 < 2h1.

[0062] The first fold height origami structure 10 and the second fold height origami structure 11 are evenly distributed around the circumference. The outer edges of the first fold height origami structure 10 and the second fold height origami structure 11 are on the same circumference, and the radius of the circumference where the inner edge of the first fold height origami structure 10 is located is greater than the radius of the circumference where the inner edge of the second fold height origami structure 11 is located.

[0063] This utility model discloses a filter paper structure for filtration that employs an intermittent, equal-height layout. In this structure, the folding height alternates between two dimensions, h1 and h2. h1 is the same as the folding height h in existing structures, while the height h2 can be adjusted between h and 2h according to specific requirements.

[0064] Assuming the folding height h of the existing structure is 10cm, in the structure of this invention, h1 remains 10cm, while h2 can be set to 15cm, i.e., 1.5h. This adds 5cm of filter paper height between each two folds.

[0065] This optimized filter paper folding structure, compared to existing technology, can increase the filter paper area by 10%-50% within the same spatial structure. This means that if the original filter paper area is 100 square centimeters, the optimized area could increase to 110-150 square centimeters. The direct effect of this structural improvement is an increase in maintenance intervals. Maintenance intervals can be increased by 50%. That is, if the original filter needed to be replaced after 10,000 kilometers, with this new structure, it could be extended to 15,000 kilometers before needing replacement. This improvement not only increases the filter's filtration efficiency and lifespan but also brings real economic benefits to users by reducing the frequency of maintenance, thereby lowering maintenance costs.

[0066] See Figures 8-10 An integrated modular fuel filter assembly including a filter paper structure for filtering includes:

[0067] The main housing assembly 1 includes at least a main housing 101, which forms an L-shaped oil passage;

[0068] The lower end of the housing cover assembly 3 is sealed to the upper end of the main housing assembly 1. The housing cover assembly 3 includes at least an inverted U-shaped housing cover 301. The flange face of the housing cover 301 is connected to the upper flange face of the main housing 101 with a threaded hole by a second fastening screw 302.

[0069] A filter element assembly 2 is coaxially located in the space formed by the main housing assembly 1 and the housing cover assembly 3. The lower end of the filter element assembly 2 is sealed to the inside of the main housing 101 of the main housing assembly 1. The filter element assembly 2 includes at least a filter layer 201 with alternating first folded paper structure 10 and second folded paper structure 11.

[0070] The water collection cup assembly 4 is sealed to the upper end and the lower end of the main housing assembly 1. The water collection cup assembly 4 includes at least a third heater 401. The third heater 401 is fixed inside the water collection cup assembly 4 by a third fastening screw 404. An eighth O-ring 405 is provided at the joint between the third heater 401 and the hole wall provided on the outer wall of the water collection cup assembly 4. The ceramic heating rod of the third heater 401 extends from the bottom of the main housing 101 to the upper part for heating.

[0071] See Figures 11-15 The main housing 101 includes:

[0072] The upper filter chamber 102 has the filter element assembly 2 located inside the filter chamber 102, and the bottom of the filter chamber 102 is provided with an oil inlet process thread hole 105.

[0073] The oil outlet channel 103 is located at the lower part of the filter chamber 102, and the two ends of the oil outlet channel 103 are provided with oil outlet process thread holes 106 as oil outlets.

[0074] And a one-way valve mounting hole 104 connecting the filter chamber 102 and the oil outlet channel 103.

[0075] The main housing assembly 1 also includes:

[0076] The first plug 109 is installed in the oil inlet process thread hole 105 of the main housing 101 by means of threaded connection and is sealed by the first combination washer 110.

[0077] The second plug 111 is installed in the oil outlet process thread hole 106 of the main housing 101 by means of threaded connection and is sealed by the second combined washer 112.

[0078] The third plug 113 is installed in the internal threaded holes of the electric pump inlet 107 and the electric pump outlet 108 of the main housing 101 by means of threaded connection and is sealed by the third combination washer 114.

[0079] One-way valve plate 115, the one-way valve plate 115 and the one-way valve seat 116 are combined together by snap-fit ​​and are interference-fitted in the one-way valve mounting hole 104 of the main housing 101;

[0080] An exhaust duct 117 is installed in the main housing 101 by a threaded connection at its lower end, and the threaded connection is coated with thread sealant.

[0081] The system includes an electric pump 118, which is connected to the threaded side flange of the main housing 101 via a first fastening screw 119 and sealed by a second O-ring 120 and a third O-ring 121. The electric pump inlet 107 is connected to the lower end of the exhaust pipe 117, and the electric pump outlet 108 is connected to the oil outlet channel 103 of the main housing 101. Initially, the filter is filled with air. When the electric pump 118 is powered on, the front end of the electric pump 118, i.e., the top end of the exhaust pipe 117, is under negative pressure. Gas in the filter chamber 102 enters the electric pump 118 from the top end of the exhaust pipe 117 and then exits through the outlet of the electric pump 118 into the oil outlet channel 103 of the main housing 101. As the gas flows out, fuel gradually enters the filter. When the fuel interface is higher than the top port of the exhaust pipe 117, the exhaust process is complete.

[0082] See Figure 16 The housing cover assembly 3 further includes:

[0083] A venting knob 303 that rotates with the threaded hole cover at the center of the upper end of the housing cover 301;

[0084] A sixth O-ring 304 is provided between the venting knob 303 and the housing cover 301;

[0085] And a compression spring 305 coaxially arranged with the venting knob 303, the upper end of the compression spring 305 is interference-fitted with the inner surface of the upper end of the housing cover 301, and the lower end is in contact with the upper end of the filter element assembly 2 and is in a compressed state.

[0086] The sealing connection between the lower end of the housing cover assembly 3 and the upper end of the main housing assembly 1 is specifically as follows: the lower end of the housing cover 301 is inserted into the upper end of the main housing 101, and a seventh O-ring seal 306 is provided at the mating point between the housing cover 301 and the main housing 101.

[0087] See Figure 17 and Figure 18The filter element assembly 2 includes a hydrophobic mesh 204, a central tube 203, a support layer 202, and a filter layer 201 arranged coaxially from the inside out. The upper ends of the hydrophobic mesh 204, central tube 203, support layer 202, and filter layer 201 are glued to the filter element upper cover 205, and the lower ends are glued to the filter element lower cover 206. The filter element lower cover 206 is sealed to the inner wall of the main housing 101 through a fourth O-ring 207 and a fifth O-ring 208. The filter layer 201 is a filter paper structure for filtration disclosed in this utility model, including alternating first folded paper structure 10 and second folded paper structure 11, which are intermittently alternating around the filter element axis. Fuel enters through the inlet process threaded hole 105 and flows through the filter layer 201 to remove impurities. The filtered fuel then passes through the hydrophobic mesh 204 to remove water. Due to its density, the water settles in the water collection cup 402. The clean fuel, after passing through the hydrophobic mesh 204, flows through the one-way valve seat 116 into the oil outlet channel 103 and is supplied to the next fuel supply module through the outlet process threaded hole 106. The housing cover assembly 3, the main housing assembly 1, and the outer side of the filter layer 201 of the filter element assembly 2 form the pre-filtration chamber. The inner side of the filter layer 201 of the filter element assembly 2, the outer side of the hydrophobic mesh 204 of the filter element assembly 2, the main housing assembly 1, and the water collection cup assembly 4 form the water filtration chamber. The inner side of the hydrophobic mesh 204 of the filter element assembly 2 and the main housing assembly 1 form the clean fuel chamber that removes water and impurities. The inlet process threaded hole 105 of the main housing 101 is correspondingly located in the pre-filtration chamber, and the one-way valve mounting hole 104 connects the clean fuel chamber and the oil outlet channel 103.

[0088] See Figure 19 The water collection cup assembly 4 further includes:

[0089] The water collection cup 402 is connected to the lower flange with threaded holes of the main housing 101 by a fourth fastening screw 403. The third heater 401 is fixed inside the water collection cup 402 by a third fastening screw 404. An eighth O-ring 405 is provided at the mating point between the third heater 401 and the hole wall provided on the outer wall of the water collection cup 402.

[0090] And a water level alarm 406, which is installed in the threaded hole at the bottom of the water collection cup 402 by a threaded connection and sealed by a rectangular sealing ring 407; the water level alarm 406 detects the water level in the water collection cup 402. When the water level completely submerges the water level alarm 406, the two contact pins at the top of the water level alarm 406 will conduct in the water, forming an electrical signal and triggering an alarm.

[0091] The sealing connection between the upper end of the water collection cup assembly 4 and the lower end of the main housing assembly 1 is specifically as follows: the upper end of the water collection cup 402 is inserted into the lower end of the main housing 101, and a ninth O-ring 408 is provided at the mating point between the water collection cup 402 and the main housing 101.

Claims

1. A filter paper structure for filtration, characterized by It includes alternating first fold height paper folding structure (10) and second fold height paper folding structure (11), the first fold height paper folding structure (10) and the second fold height paper folding structure (11) are intermittently alternating around the filter core axis; The first folding height folding structure (10) has a folding height of h1, and the second folding height folding structure (11) has a folding height of h2, and h2 satisfies: h1 < h2 < 2h1; The first fold height origami structure (10) and the second fold height origami structure (11) are evenly distributed around the circumference.

2. An integrated modular fuel filter assembly comprising a filter paper structure according to claim 1, characterized in that include: The main housing assembly (1) includes at least a main housing (101) and forms an L-shaped oil passage; The lower end of the housing cover assembly (3) is sealed to the upper end of the main housing assembly (1). The housing cover assembly (3) includes at least an inverted U-shaped housing cover (301). The flange face of the housing cover (301) is connected to the upper flange face of the main housing (101) with a threaded hole by a second fastening screw (302). A filter element assembly (2) is coaxially located in the space formed by the main housing assembly (1) and the housing cover assembly (3). The lower end of the filter element assembly (2) is sealed to the inside of the main housing (101) of the main housing assembly (1). The filter element assembly (2) includes at least a filter layer (201) with alternating first folded paper structure (10) and second folded paper structure (11). The water collection cup assembly (4) is sealed to the upper end and the lower end of the main housing assembly (1), the water collection cup assembly (4) including at least a third heater (401), the ceramic heating rod of the third heater (401) extending from the bottom of the main housing (101) to the upper part for heating.

3. The integrated modular fuel filter assembly of claim 2, wherein, The main housing (101) includes: The upper filter chamber (102) has a filter element assembly (2) located inside the filter chamber (102), and the bottom of the filter chamber (102) is provided with an oil inlet process thread hole (105). The oil outlet channel (103) located at the lower part of the filter chamber (102) has oil outlet process threaded holes (106) at both ends of the oil outlet channel (103) as oil outlets. And a one-way valve mounting hole (104) connecting the filter chamber (102) and the oil outlet channel (103).

4. The integrated modular fuel filter assembly of claim 3, wherein, The main housing assembly (1) further includes: The first plug (109) is installed in the oil inlet process thread hole (105) of the main housing (101) by means of threaded connection and sealed by the first combination washer (110); The second plug (111) is installed in the oil outlet process thread hole (106) of the main housing (101) by means of threaded connection and sealed by the second combination washer (112); The third plug (113) is installed in the internal threaded holes of the electric pump inlet (107) and electric pump outlet (108) of the main housing (101) by means of threaded connection and sealed by the third combination washer (114). One-way valve plate (115), the one-way valve plate (115) and the one-way valve seat (116) are combined together by snap-fit ​​and are interference-fitted in the one-way valve mounting hole (104); An exhaust duct (117) is installed in the main housing (101) by means of a threaded connection at its lower end, and the threaded connection is coated with thread sealant. And an electric pump (118), which is connected to the threaded side flange of the main housing (101) by a first fastening screw (119) and sealed by a second O-ring (120) and a third O-ring (121). The lower end of the electric pump inlet (107) and the exhaust pipe (117) are connected, and the electric pump outlet (108) is connected to the oil outlet channel (103) of the main housing (101).

5. The integrated modular fuel filter assembly of claim 2 or 3, wherein, The housing cover assembly (3) also includes: A venting knob (303) is rotatably fitted with a threaded hole cover at the center of the upper end of the housing cover (301), and a sixth O-ring (304) is provided between the venting knob (303) and the housing cover (301). And a compression spring (305) coaxially arranged with the venting knob (303), the upper end of the compression spring (305) is interference-fitted with the inner surface of the upper end of the housing cover (301), and the lower end is in contact with the upper end of the filter element assembly (2) and is in a compressed state.

6. The integrated modular fuel filter assembly of claim 2 or 3, wherein, The sealing connection between the lower end of the housing cover assembly (3) and the upper end of the main housing assembly (1) is specifically as follows: the lower end of the housing cover (301) is inserted into the upper end of the main housing (101), and a seventh O-ring (306) is provided at the mating point between the housing cover (301) and the main housing (101).

7. The integrated modular fuel filter assembly of claim 2 or 3, wherein, The filter element assembly (2) includes a hydrophobic mesh (204), a central tube (203), a support layer (202), and a filter layer (201) arranged coaxially from the inside to the outside; the upper end of the hydrophobic mesh (204), the central tube (203), the support layer (202), and the filter layer (201) are glued to the filter element upper cover (205), and the lower end is glued to the filter element lower cover (206); the filter element lower cover (206) is sealed to the inner wall of the main housing (101) through a fourth O-ring (207) and a fifth O-ring (208); the housing upper cover assembly (3) and the main housing assembly The filter layer (201) of the filter element assembly (2) forms the pre-filter chamber; the filter layer (201) of the filter element assembly (2), the outer side of the hydrophobic mesh (204) of the filter element assembly (2), the main housing assembly (1) and the water collection cup assembly (4) form the water filtration chamber; the hydrophobic mesh (204) of the filter element assembly (2) and the main housing assembly (1) form the clean fuel chamber for removing water and impurities; the oil inlet process thread hole (105) of the main housing (101) is correspondingly set in the pre-filter chamber, and the one-way valve mounting hole (104) connects the clean fuel chamber and the oil outlet channel (103).

8. The integrated modular fuel filter assembly of claim 2 or 3, wherein, The water collection cup assembly (4) also includes: The water collection cup (402) has its flange face connected to the threaded lower flange face of the main housing (101) by a fourth fastening screw (403). The third heater (401) is fixed inside the water collection cup (402) by a third fastening screw (404). An eighth O-ring (405) is provided at the joint between the third heater (401) and the hole wall provided on the outer wall of the water collection cup (402). And a water level alarm (406), which is installed in the threaded hole of the water collection cup (402) by means of a threaded connection and is sealed by a rectangular sealing ring (407); The sealing connection between the upper end of the water collection cup assembly (4) and the lower end of the main housing assembly (1) is specifically as follows: the upper end of the water collection cup (402) is inserted into the lower end of the main housing (101), and a ninth O-ring (408) is provided at the mating point between the water collection cup (402) and the main housing (101).

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