CN112459940A

CN112459940A - Fuel filter

Info

Publication number: CN112459940A
Application number: CN202011528097.5A
Authority: CN
Inventors: 覃文豪; 顾晶晶; 张金玲; 李�权; 汤金鹏; 王磊
Original assignee: Wuxi Yili Environmental Protection Technology Co Ltd; Hebei Yili Technology Co Ltd
Current assignee: Wuxi Yili Environmental Protection Technology Co Ltd; Hebei Yili Technology Co Ltd
Priority date: 2020-12-22
Filing date: 2020-12-22
Publication date: 2021-03-09

Abstract

The invention discloses a fuel filter, which comprises a base, a shell and a filter element assembly, wherein the upper part of the base is provided with an oil inlet pipe and an oil outlet pipe, and the lower part of the base is provided with a sleeve part; the shell is connected to the sleeve part, and a filter element assembly is arranged in the shell; the central vertical tube of the base has a vertical first central channel; an electric pump is inserted in an electric pump channel on the base, and a one-way valve is arranged in a one-way valve channel; the one-way valve channel is directly communicated with the first central channel through the second oil inlet, and a channel main body of the one-way valve channel is intersected with a channel main body of the oil outlet pipe to form a second oil outlet. The one-way valve channel is directly communicated with the first central channel through the inclined hole, so that the number of channels in the base is reduced, the use of sealing parts matched with the channels is reduced, potential sealing failure points are reduced, the processing technology difficulty of the base is reduced, the control difficulty of the processing precision is reduced, and the deviation is avoided.

Description

Fuel filter

Technical Field

The invention relates to the technical field of vehicle fuel filters, in particular to a fuel filter.

Background

The fuel prefilter is arranged in an engine fuel supply system and is used for filtering impurities, water and other pollutants in fuel and inputting the filtered fuel into the fuel delivery pump and the fuel injector, so that the problems of excessive wear or blockage of important parts such as the fuel delivery pump and the fuel injector are avoided, and the normal work of an engine is ensured.

The existing fuel filter with an electric pump has the following problems:

(1) a one-way valve is arranged on a base of the fuel filter, and a channel for placing an electric pump on the base is communicated with a channel for placing the one-way valve. On the existing base, the one-way valve is usually arranged right below the electric pump, namely, a one-way valve channel is arranged below the electric pump channel, the one-way valve channel is communicated with an oil inlet pipe of the electric pump channel through a vertical channel, at least one end part of the vertical channel is communicated with the base for processing, in the using process, the communicated end part of the vertical channel needs to be sealed by adopting a corresponding plug and a corresponding sealing element, and more required parts are needed; once the sealing performance of the plug or the sealing element fails, the internal sealing performance can be directly influenced, namely, the number of potential sealing failure points is large; in addition, the multiple channels which are communicated in a staggered mode transversely and vertically are processed inside the base, the more the channels are, the greater the processing technology difficulty is, the greater the control difficulty of the processing precision is, and the deviation is easy to occur.

(2) The valve seat of the existing check valve is usually fixed in a check valve channel through buckle connection, and the outer end part of the check valve channel is sealed by adopting a plug and a sealing piece. By adopting the mode, the clamping groove matched with the buckle needs to be processed on the inner wall surface of the one-way valve channel, so that the processing difficulty of the base is increased; moreover, after the valve seat is clamped, the valve seat is difficult to take out, the disassembly and assembly difficulty is high when the check valve needs to be replaced in the later period, the labor and the time which need to be consumed are long, and the labor cost and the time cost are high.

(3) The filter element assembly of the fuel filter is generally placed into the shell integrally, and then the shell is screwed to the base through thread fit, and at the moment, the upper end part of the filter element assembly is inserted into the central channel of the base; by adopting the assembly mode, the assembly precision between the filter element assembly and the base needs to be indirectly determined through the assembly precision between the shell and the base, namely, firstly, higher assembly precision between the filter element assembly and the shell needs to be ensured, so that when the shell is assembled on the base, the upper end part of the filter element assembly can be accurately inserted into the central channel of the base, if the assembly between the filter element assembly and the shell is over-poor, the assembly and the matching among the subsequent shell, the filter element assembly and the base can be influenced, and the assembly precision between the filter element assembly and the shell is higher required by the mode, and the difficulty of the assembly process is increased; moreover, by adopting the assembly mode, the requirement on the assembly precision between the filter element assembly and the shell is high, namely the filter element assembly is matched with the shell more tightly, the filter element assembly is basically and integrally placed in the shell, when the filter element assembly is disassembled and replaced, the filter element assembly needs to be taken out of the shell, the difficulty is higher, the labor and the time which need to be consumed are more, and the labor cost and the time cost are higher.

Disclosure of Invention

The applicant aims at the defects of the existing fuel filter with the electric pump, and provides a fuel filter with a reasonable structure, so that the number of parts and potential sealing failure points of a base are reduced, the processing difficulty of the base is reduced, the assembly difficulty among a filter element assembly, a shell and the base is reduced, and the disassembly and assembly cost is reduced.

The technical scheme adopted by the invention is as follows:

a fuel filter comprises a base, a shell and a filter element assembly, wherein an oil inlet pipe and an oil outlet pipe are arranged at the upper part of the base, and a sleeve part is arranged at the lower part of the base; the shell is connected to the sleeve part, a filter element assembly is arranged in the shell, a dirty oil cavity is formed in the shell and positioned on the outer side of the filter element assembly in the circumferential direction, and a clean oil cavity is formed in the filter element assembly; a central vertical pipe extends downwards from the base, the central vertical pipe is provided with a vertical first central channel, and the first central channel is communicated with the oil purification cavity; an electric pump channel is formed in the base, an electric pump is inserted into the electric pump channel, a sealing element is arranged on the periphery of the middle of the electric pump, and a cavity of the electric pump channel, which is positioned on the outer side of the electric pump, is divided into an oil inlet cavity and an oil outlet cavity; on the base, a first oil inlet is formed in the first central channel and communicated with the oil inlet cavity, and a first oil outlet is formed in the first central channel and communicated with the oil outlet cavity and the oil outlet pipe; a one-way valve channel is arranged on the base and below the oblique side of the electric pump channel, the one-way valve channel and the first central channel have a certain overlapping height in the longitudinal direction and are directly communicated through a second oil inlet, and a channel main body of the one-way valve channel is intersected with a channel main body of the oil outlet pipe to form a second oil outlet for communicating the one-way valve channel and the oil outlet pipe; a one-way valve is arranged in the one-way valve channel and positioned at the outer side of the second oil inlet.

The one-way valve channel can be communicated with the first central channel directly through the inclined hole, so that the one-way valve channel and the first central channel can be communicated without adding an additional channel to communicate the two, the number of channels in the base is reduced, the use of sealing parts matched with the channels is reduced, potential sealing failure points are reduced, and the processing process difficulty of the base is reduced, the control difficulty of the processing precision is reduced, and the deviation is avoided. The check valve passageway directly forms the second oil-out through the position passageway of sharing oil pipe, the mould core drawing of patterns that directly passes through the quadrature at the base promptly forms oil pipe and check valve passageway, can realize the intercommunication of the two, need not communicate through extra passageway again, the inside passageway quantity of base has further been reduced, the use of the sealed spare part that matches with the passageway has further been reduced, reduce the potential sealed point of failure, the processing technology degree of difficulty of base has been reduced, the control degree of difficulty of machining precision has been reduceed.

As a further improvement of the above technical solution:

the check valve channel is close to the upper end part of the first central channel and is positioned on the inclined upper side of the first central channel, and the second oil inlet is an inclined hole; in a normal working state, the flow direction of fuel oil is as follows: oil inlet pipe → dirty oil chamber → clean oil chamber → first central channel → second oil inlet → one-way valve channel → oil outlet pipe; when the electric pump works, the flow direction of fuel oil is as follows: oil inlet pipe → dirty oil chamber → clean oil chamber → first central channel → first oil inlet → oil inlet chamber of electric pump channel → oil outlet chamber of electric pump channel → first oil outlet → oil outlet pipe.

A first convex ring is protruded on the inner peripheral wall surface of the middle part of the central vertical pipe, and a first annular groove is formed on the upper side of the first convex ring; the upper end of the filter element assembly extends out of the insertion part, the insertion part is provided with a plurality of buckles, the buckles of the insertion part and the first convex ring and the first annular groove of the central vertical pipe form a clamping structure, and the filter element assembly is clamped on the base through the clamping structure.

The filter element assembly is clamped on the base through the clamping structure, the assembly between the filter element assembly and the base is not required to be determined indirectly through the shell, namely the assembly precision between the filter element assembly and the base is determined by the clamping structure of the filter element assembly and the base directly, the assembly and the matching between the filter element assembly and the base cannot be influenced even if the assembly between the filter element assembly and the shell is out of tolerance, and the filter element assembly is more easily centered with the shell after being clamped on the base, so that the assembly difficulty among the base, the shell and the filter element assembly is reduced; by adopting the assembly mode, when the filter element assembly is disassembled and replaced, the shell is only required to be unscrewed, and then the filter element assembly is pulled down from the base, so that the disassembly and assembly difficulty is low, the assembly and assembly are simple and convenient, the labor force required to be consumed is long, and the labor cost and the time cost are low.

A step surface is arranged on the inner peripheral wall surface of the middle part of the one-way valve channel and is positioned between the second oil inlet and the second oil outlet; the plug of the one-way valve presses the valve seat on the step surface of the one-way valve channel, and the valve plate penetrates through the valve seat.

The end cap of check valve is equipped with connecting portion, fretwork portion, the portion of compressing tightly in proper order from inside to outside, and connecting portion fixed connection is in the check valve passageway, and fretwork portion corresponds to be located second oil outlet department, switches on oil pipe and check valve passageway, compresses tightly the portion and compresses tightly on the terminal surface of disk seat.

The valve seat of the check valve is fixed in a plug pressing mode, only one step surface for axially limiting the plug is required to be processed on the inner wall surface of the passage of the check valve, the processing technology difficulty is reduced, the plug is required to be screwed out during disassembly and assembly, the valve seat communicating valve plate can be taken out for replacement, the disassembly and assembly difficulty is low, simplicity and convenience are realized, the consumed labor is low, the duration is short, and the labor cost and the time cost are low.

A heater is arranged in the base and above the filter element assembly, and comprises a heater seat, a heating sheet, a heat conducting sheet and a plug connector; the base is provided with a plug connector penetrating hole, and the plug connector of the heater penetrates out from the plug connector penetrating hole.

The heater is positioned below the oil inlet pipe and the oil outlet pipe and close to the oil inlet pipe and the oil outlet pipe, so that fuel oil can be heated at the first time after entering from the oil inlet pipe, a faster heating speed can be obtained in an environment with lower temperature, the heating time is shorter, and the base is a metal piece and can also play a role in heat conduction, so that the heating efficiency is higher.

The electric pump channel is parallel to the one-way valve channel; the inner side surfaces and the peripheral surfaces of the electric pump channel and the one-way valve channel are closed.

One end of the oil inlet pipe and one end of the oil outlet pipe are open, the other end of the oil inlet pipe and the oil outlet pipe are sealed by adopting a plug and a sealing piece, and the open ends of the oil inlet pipe and the oil outlet pipe are positioned on two opposite sides or on the same side.

The cavity in the shell and below the filter element assembly is a water collecting cavity, a water level sensor component is arranged at the bottom of the shell, and a sensing part of the water level sensor component extends into the water collecting cavity.

The filter paper layer of the filter element assembly is sleeved on the framework, the upper end and the lower end of the filter paper layer are provided with an upper end cover and a lower end cover, the center of the framework is inserted with a hydrophobic net, the inner cavity of the hydrophobic net is an oil purifying cavity, and the cavity between the outer surface of the hydrophobic net and the inner surface of the framework is a hydrophobic cavity; the center of the lower end cover is provided with a drain hole which is communicated with the drainage cavity and the water collecting cavity.

The invention has the following beneficial effects:

Drawings

Fig. 1 is a front view of the present invention.

3 fig. 32 3 is 3 a 3 sectional 3 view 3 a 3- 3 a 3 of 3 fig. 31 3. 3 At this time, the present invention is in a normal working state, and the arrow in the figure shows the direction of fuel.

Fig. 3 is a cross-sectional view B-B of fig. 1, with the present invention in a normal operating state, and with arrows showing the direction of fuel flow.

Fig. 4 is the same as fig. 3, in the state of the electric pump, the present invention is in the state of operation, and the arrow shows the direction of the fuel.

Fig. 5 is an enlarged view of a portion C in fig. 4.

Fig. 6 is a perspective view of the base.

FIG. 7 is a longitudinal sectional view taken in parallel with the central axis of the oil inlet pipe in FIG. 6.

Fig. 8 is a perspective view of the plug of the check valve.

Fig. 9 is a perspective view of the cartridge assembly.

Fig. 10 is a cross-sectional view of fig. 9.

Fig. 11 is an enlarged view of a portion D in fig. 10.

Figure 12 is a semi-sectional view of a hydrophobic mesh.

Fig. 13 is an enlarged view of a portion E in fig. 12.

Fig. 14 is a sectional view of a heater.

Fig. 15 is a perspective cutaway view of the housing.

In the figure: 1. a base; 10. a sleeve portion; 11. an oil inlet pipe; 12. an oil outlet pipe; 13. an electric pump channel; 131. an oil inlet cavity; 132. a first oil inlet; 133. an oil outlet cavity; 134. a first oil outlet; 14. a one-way valve passage; 141. a second oil inlet; 142. a second oil outlet; 143. a step surface; 15. a central vertical tube; 151. a first central channel; 152. a first convex ring; 153. a ring groove; 16. the plug connector penetrates out of the hole;

2. a housing; 21. a first rib; 22. a second rib; 23. an opening; 24. a limiting edge;

3. a filter element assembly; 31. a filter paper layer; 32. a framework; 321. a step; 322. a second convex ring; 33. a hydrophobic net; 331. a first flanging; 332. a groove; 333. a third convex ring; 34. an upper end cover; 341. a cover plate portion; 342. an insertion part; 343. a guide pipe part; 344. buckling; 345. a bump; 346. air holes; 35. a lower end cover; 351. drain hole

4. A heater; 41. a heater seat; 42. second flanging; 43. a heating plate; 44. a heat conductive sheet; 45. a recess; 46. a plug-in unit; 47. inserting holes;

5. a water level sensor assembly; 6. an electric pump;

7. a one-way valve; 71. a plug; 711. a connecting portion; 712. a hollow-out section; 713. a pressing part; 72. a valve plate; 73. a valve seat;

8. a seal ring;

100. a dirty oil chamber; 200. a clean oil chamber; 300. a drainage cavity; 400. a second central channel; 500. a water collecting cavity.

Detailed Description

The following describes embodiments of the present invention with reference to the drawings.

As shown in fig. 1, 3 and 4, the base 1 of the present invention is a metal member, and the upper portion of the base 1 is provided with an oil inlet pipe 11 and an oil outlet pipe 12; the lower part of the base 1 is provided with a sleeve part 10, the sleeve part 10 is provided with an internal thread, the sleeve part 10 is fixed with a shell 2 through thread matching, a filter element assembly 3 is arranged in the shell 2, an internal cavity of the shell 2 is a dirty oil cavity 100 positioned at the circumferential outer side of the filter element assembly 3, a water collecting cavity 500 positioned below the filter element assembly 3, a clean oil cavity 200, a hydrophobic cavity 300 and a second central channel 400 are arranged in the filter element assembly 3, the hydrophobic cavity 300 is communicated with the water collecting cavity 500, the bottom of the shell 2 is provided with a water level sensor component 5, a sensing part of the water level sensor component 5 extends into the water collecting cavity 500 to monitor the water level of the water collecting cavity 500, the bottom of the shell 2 is communicated with the water collecting cavity 500 and is provided with a drain valve (not shown in the figure), and; a heater 4 is arranged in the base 1 and above the filter element assembly 3, and a plug-in connector 46 of the heater 4 penetrates out of the base 1.

As shown in fig. 2, one end of the oil inlet pipe 11 and one end of the oil outlet pipe 12 of the base 1 are open, and the other ends are sealed by adopting a plug and a sealing element; the open ends of the oil inlet pipe 11 and the oil outlet pipe 12 are located on two opposite sides, or can be located on the same side. As shown in fig. 7, a central vertical pipe 15 is downwardly extended from the middle of the base 1 inside the sleeve portion 10, the central vertical pipe 15 has a vertical first central passage 151, a first protrusion ring 152 is protruded from the inner peripheral wall surface of the middle of the central vertical pipe 15, and a first ring groove 153 is formed on the upper side of the first protrusion ring 152. As shown in fig. 7, a plug-in unit insertion hole 16 is provided in the base 1 on the outer side of the central vertical pipe 15, and a plug-in unit 46 of the heater 4 is inserted through the plug-in unit insertion hole 16. As shown in fig. 3, an electric pump channel 13 with a closed inner side surface and a closed peripheral surface is horizontally arranged on the base 1 and positioned at the upper side of the oil inlet pipe 11 and the oil outlet pipe 12, the electric pump channel 13 is orthogonal to the oil inlet pipe 11 and the oil outlet pipe 12, an electric pump 6 is inserted into the electric pump channel 13, a sealing element is arranged at the periphery of the middle part of the electric pump 6, and a cavity of the electric pump channel 13 positioned at the outer side of the electric pump 6 is divided into an oil inlet cavity 131 and an oil outlet; on the base 1, a first oil inlet 132 is formed by communicating the oil inlet cavity 131 with the first central channel 151, and a first oil outlet 134 is formed by communicating the oil outlet cavity 133 with the oil outlet pipe 12. As shown in fig. 2, 6 and 7, a check valve passage 14 with a closed inner side surface and a closed peripheral surface is arranged on the base 1, is located below the oblique side of the electric pump passage 13, is parallel to the electric pump passage 13, a second oil inlet 141 is arranged on the base 1 for communicating the check valve passage 14 with the first central passage 151, and a second oil outlet 142 is arranged for communicating the check valve passage 14 with the oil outlet pipe 12; as shown in fig. 2, the middle portion of the check valve passage 14 has a stepped surface 143 on the inner peripheral wall surface, and the stepped surface 143 is located between the second oil inlet 141 and the second oil outlet 142. As shown in fig. 7, the check valve passage 14 is close to the upper end of the first central passage 151 and located on the oblique upper side of the first central passage 151, the check valve passage 14 and the first central passage 151 have a certain overlap height in the longitudinal direction, and are directly communicated through the oblique hole type second oil inlet 141, as shown in fig. 3 and 4, and are further directly communicated with the first oil inlet 132 through the shared first central passage 151, that is, the check valve passage 14 is directly communicated with the first central passage 151 through an oblique hole (the second oil inlet 141) to achieve communication with the first oil inlet 132 without adding an additional passage to communicate the two, thereby reducing the number of passages inside the base 1, reducing the use of sealing parts matched with the passages, reducing potential sealing failure points, and reducing the difficulty of the base processing process due to the reduction of the number of the passages, the control difficulty of the machining precision is reduced, and the deviation is avoided. As shown in fig. 2 and 6, the check valve channel 14 is orthogonal to the oil outlet pipe 12 and is located at one side close to the sealing end of the oil outlet pipe 12, the channel main body of the check valve channel 14 is intersected with the channel main body of the oil outlet pipe 12, the second oil outlet 142 is directly formed by the channel at the part of the common oil outlet pipe 12 of the check valve channel 14, namely, the oil outlet pipe 12 and the check valve channel 14 are directly formed on the base 1 through demolding of an orthogonal mold core, so that the communication between the two can be realized, the communication is not required through an additional channel, the number of channels inside the base 1 is further reduced, the use of sealing parts matched with the channels is further reduced, potential sealing failure points are reduced, the processing difficulty of the base is reduced, and the control difficulty of the processing precision is reduced.

As shown in fig. 2, a check valve 7 is disposed in the check valve channel 14 and outside the second oil inlet 141, the check valve 7 includes a plug 71, an umbrella-shaped valve sheet 72 and a valve seat 73, sealing members are disposed between the plug 71 and the valve seat 73 and an inner wall surface of the check valve channel 14 for sealing, a rod portion of the valve sheet 72 passes through a center of the valve seat 73 and is limited by a corresponding limiting structure, an umbrella surface portion of the valve sheet 72 is located in a cavity on one side of the plug 71, and the plug 71 presses the valve seat 73 against a step surface 143 of the check valve channel 14 for limiting. As shown in fig. 8, the plug 71 is sequentially provided with a connecting portion 711, a hollow portion 712 and a pressing portion 713 from outside to inside, the connecting portion 711 is provided with an external thread, a circumferential wall surface of the hollow portion 712 is a hollow surface and has a plurality of through holes, the pressing portion 713 includes a plurality of tongues extending outwards from an end surface of the hollow portion 712, and the tongues are uniformly arranged along the circumferential direction; as shown in fig. 2, the connecting portion 711 screws the plug 71 into the check valve channel 14 by screw-fitting, the hollow portion 712 is correspondingly located at the second oil outlet 142, the oil outlet pipe 12 is communicated with the check valve channel 14, and a plurality of tongues of the pressing portion 713 are pressed against an end surface of the valve seat 73; the valve seat 73 is fixed in a mode of pressing the plug 71, only one step face 143 for axially limiting the plug 71 is required to be machined on the inner wall face of the one-way valve channel 14, the machining process difficulty is reduced, the plug 71 only needs to be screwed out during disassembly and assembly, the valve seat 73 and the valve plate 72 can be taken out and replaced, the disassembly and assembly difficulty is low, simplicity and convenience are realized, the labor force required to be consumed is small, the time is long, and the labor cost and the time cost are low.

As shown in fig. 9 and 10, the filter paper layer 31 of the filter element assembly 3 is sleeved on the framework 32, the upper end and the lower end of the filter paper layer 31 are fixedly connected with an upper end cover 34 and a lower end cover 35 through bonding, the center of the framework 32 is inserted with a hydrophobic net 33, the top end of the hydrophobic net 33 is fixedly connected with the upper end cover 34 through bonding, the inner cavity of the hydrophobic net 33 is an oil purifying cavity 200, and the cavity between the outer surface of the hydrophobic net 33 and the inner surface of the framework 32 is a hydrophobic cavity 300; a drain hole 351 is formed in the center of the lower end cover 35, and as shown in fig. 3 and 4, the drain hole 351 communicates the drain chamber 300 and the water collecting chamber 500. As shown in fig. 10, the upper end cap 34 includes a circular cover plate portion 341 covering the upper end surface of the filter paper layer 31, an insertion portion 342 extends upward from the center of the cover plate portion 341, and a duct portion 343 extends downward from the center of the cover plate portion 343, a vertical second central passage 400 is formed inside the duct portion 343, and the second central passage 400 axially penetrates through the insertion portion 342 and the duct portion 343; the cover plate portion 341, the insertion portion 342, and the duct portion 343 of the upper end cover 34 are integrally formed, but in other embodiments, the cover plate portion 341, the insertion portion 342, and the duct portion 343 may be separately processed and then assembled in an assembling manner. The duct portion 343 extends into the hydrophobic net 33, and the lower end portion thereof extends to a position close to the bottom surface of the hydrophobic net 33, and the second central passage 400 and the clean oil chamber 200 are communicated with each other with a certain distance between the bottom end surface of the duct portion 343 and the bottom surface of the hydrophobic net 33. As shown in fig. 10 and 11, a plurality of buckles 344 are uniformly arranged on the upper portion of the insertion portion 342 along the circumferential direction, as shown in fig. 3, 4 and 5, the insertion portion 342 is inserted into the central vertical pipe 15 of the base 1, the second central channel 400 is communicated with the first central channel 151, the buckles 344 of the insertion portion 342, the first convex ring 152 and the first annular groove 153 of the central vertical pipe 15 form a clamping structure, and the filter cartridge assembly 3 is clamped on the base 1 through the clamping structure; a sealing ring 8 is arranged between the outer peripheral surface of the inserting part 342 and the inner peripheral surface of the central vertical pipe 15 and below the clamping structure for sealing; during assembly, the filter element assembly 3 is clamped on the base 1, the shell 2 is screwed on the base 1, assembly between the filter element assembly 3 and the base 1 is not required to be determined indirectly through the shell 2, namely, assembly accuracy between the filter element assembly 3 and the base 1 is determined by a clamping structure of the filter element assembly 3 and the base 1, even if assembly between the filter element assembly 3 and the shell 2 is out of tolerance, assembly and matching between the filter element assembly 3 and the base 1 cannot be influenced, and after the filter element assembly 3 is clamped on the base 1, centering between the filter element assembly 3 and the shell 2 is easier, so that assembly difficulty among the base 1, the shell 2 and the filter element assembly 3 is reduced; by adopting the assembly mode, when the filter element assembly 3 is disassembled and replaced, the shell 2 is only required to be unscrewed, and then the filter element assembly 3 is pulled down from the base 1, so that the disassembly and assembly difficulty is low, the assembly and assembly are simple and convenient, the labor force required to be consumed is long, the labor cost is low, and the time cost is low. As shown in fig. 9 and 10, a plurality of bumps 345 are protruded radially outward on the outer circumferential surface of the cover plate portion 341 of the upper end cover 34, the plurality of bumps 345 are uniformly arranged on the outer circumferential surface of the cover plate portion 341, and the plurality of bumps 345 play a role in limiting the filter element assembly 3, so as to ensure the uniformity of gaps between the outer circumferential surface of the upper end cover 34 and each part of the inner circumferential surface of the housing 2, and further ensure the smoothness of the fuel flowing in the dirty oil chamber 100; when the filter element assembly 3 is deformed by impact, the plurality of bumps 345 also prevent the filter element assembly 3 from being inclined in the housing 2, so that a gap for fuel flowing is still formed between the outer peripheral surface of the upper end cover 34 and each part of the inner peripheral surface of the housing 2, and the smoothness of fuel flowing is ensured. As shown in fig. 11, the upper end cover 34 is further provided with an air hole 346, the air hole 346 communicates the clean oil chamber 200 with the second central passage 400, so that air below the air hole 346 can be discharged, and the electric pump 6 can pump fuel oil through the second central passage 400.

As shown in fig. 10 and 11, a ring of step 321 protrudes inward in the radial direction from the upper end of the frame 32, and a second protruding ring 322 protrudes inward in the radial direction from the middle of the inner circumferential surface of the step 321. As shown in fig. 12, the hydrophobic net 33 has a cylindrical shape with a closed bottom surface and an open top surface, and as shown in fig. 10, the hydrophobic net 33 is located right above the drain hole 351 of the lower end cap 35, and the closed bottom surface thereof is spaced from the drain hole 351. As shown in fig. 12 and 13, the upper port of the hydrophobic net 33 is turned outwards along the radial direction to form a horizontal first flange 331, a plurality of grooves 332 are uniformly formed in the top surface of the hydrophobic net 33 along the circumferential direction, and the plurality of grooves 332 traverse the top surface of the hydrophobic net 33 along the radial direction, as shown in fig. 11, the first flange 331 is turned out horizontally to increase the annular contact area between the hydrophobic net 33 and the upper end cover 34, so that the hydrophobic net 33 and the upper end cover 34 are bonded more firmly, and the hydrophobic net 33 is not easy to fall off from the upper end cover 34; a plurality of grooves 332 are formed in the top surface of the hydrophobic net 33, when glue is injected to tightly press the hydrophobic net 33 to the bottom surface of the upper end cover 34, glue liquid can be extruded into the grooves 332 and overflows outwards from the grooves 332, the hydrophobic net 33 is more favorably pressed and flattened on the upper end cover 34, the bonding firmness is improved, the hydrophobic net 33 is prevented from being inclined, and the circumferential uniformity of an annular gap between the framework 32 and the hydrophobic net 33 is ensured. A circle of third convex ring 333 is protruded outwards along the radial direction on the outer peripheral surface below the first flanging 331 at the upper end part of the hydrophobic net 33; as shown in fig. 10 and 11, the first flange 331 of the hydrophobic net 33 is overlapped on the step 321 of the framework 32, the second convex ring 322 of the framework 32 and the third convex ring 333 of the hydrophobic net 33 are locked with each other to form an interlocking structure, the hydrophobic net 33 is further axially limited, the hydrophobic net 33 is prevented from being inclined, the circumferential uniformity of the annular gap between the framework 32 and the hydrophobic net 33 is ensured, namely the uniformity of the gap between each part of the hydrophobic cavity 300 is ensured, small water drops at each part of the hydrophobic cavity 300 are favorably accumulated into large water drops and flow downwards into the water collecting cavity 500, and the oil-water separation efficiency of the hydrophobic net 33 is improved.

As shown in fig. 14, the plug 46 of the heater 4 extends upward from the top surface of the heater base 41, the center of the heater base 41 is provided with a plug hole 47, the bottom of the heater base 41 and the outer side of the plug hole 47 are provided with the heating fins 43, and the upper and lower end surfaces of the heating fins 43 are respectively provided with the heat-conducting fins 44; the outer edge of the heater seat 41 is provided with a circle of second flanging 42 which vertically extends downwards, and a plurality of notches 45 are uniformly formed at the lower end part of the second flanging 42 along the circumferential direction. As shown in fig. 3 and 4, the heater 4 is sleeved on the periphery of the central vertical pipe 15 of the base 1 through the insertion hole 47 in the center of the heater seat 41, the heater 4 is located below the oil inlet pipe 11 and the oil outlet pipe 12 and close to the oil inlet pipe 11 and the oil outlet pipe 12, so that fuel oil can be heated at the first time after entering from the oil inlet pipe 11, a faster heating speed can be obtained in an environment with a lower air temperature, the heating time is shorter, and the base 1 is a metal piece and can also play a role in heat conduction, so that the heating efficiency is higher; a certain gap is formed between the peripheral edge of the heater seat 41 of the heater 4 and the shell 2, the gap value is 0.5-1.5mm, and the gap is small, so that most of the fuel oil entering from the oil inlet pipe 11 flows through the heater 4 to be heated and then enters the dirty oil cavity 100 of the shell 2, the effectiveness of fuel oil heating is ensured, and the heating time is favorably shortened; as shown in fig. 5, a certain gap is formed between the bottom surface of the second flange 42 of the heater seat 41 and the top surface of the cover plate 341 of the upper end cover 34 of the filter element assembly 3 to serve as a fuel flow passage, and the plurality of notches 45 circumferentially arranged on the bottom surface of the second flange 42 increase the flow area of the fuel, so that the fuel can flow through the plurality of notches 45 even if the heater 4 or the filter element assembly 3 deforms to make the bottom surface of the second flange 42 fit with the top surface of the cover plate 341, thereby ensuring the smoothness of the flow of the fuel.

As shown in fig. 15, a plurality of radially arranged straight plate type first ribs 21 and a plurality of circumferentially arranged circular ring type second ribs 22 are arranged on the inner surface of the bottom of the housing 2, the plurality of first ribs 21 are uniformly arranged on the inner surface of the bottom along the circumferential direction, the height of the first ribs 21 is greater than that of the second ribs 22, the plurality of first ribs 21 and the second ribs 22 can provide sufficient supporting strength for the bottom of the housing 2, the bottom of the housing 2 can be guaranteed not to deform under the condition of long-term heavy work, the matching tightness between the housing 2 and a corresponding sealing element is guaranteed, and the sealing performance of the fuel filter is guaranteed. As shown in fig. 3 and 4, the first ribs 21 and the second ribs 22 are located in the water collecting cavity 500, the second ribs 22 are provided with openings 23 at positions between two adjacent first ribs 21, when the drain valve is opened to drain water, water in the water collecting cavity 500 can flow to downstream from the openings 23 and flow out from the drain valve, so that the water is prevented from being blocked by the second ribs 22 and deposited in the water collecting cavity 500, and the water is ensured to be discharged more cleanly and thoroughly. As shown in fig. 15, the upper end of the housing 2 is provided with an external thread, and a limiting edge 24 is disposed below the external thread, as shown in fig. 3 and 4, after the housing 2 is screwed onto the sleeve portion 10 of the base 1, the top surface of the limiting edge 24 abuts against the bottom surface of the sleeve portion 10 to limit, so as to avoid the situation that the housing 2 extends into the base 1 to an excessive height and touches the heater 4, so that the heater 4 is deviated, and further the sealing performance between the heater 4 and the base 1 is affected, and meanwhile, the filter element assembly 3 is prevented from being deformed or even damaged when the housing 2 is screwed, and in addition, it is also possible to ensure that the sealing components of the upper end cover 34 and the lower end cover 35 of the filter element assembly.

When the invention is actually used, the invention has two working states:

(1) in a normal working state, as shown by arrows in fig. 2 and 3, fuel enters from the open end of the oil inlet pipe 11, is heated by the heater 4, enters the dirty oil cavity 100 in the housing 2, is filtered by the filter paper layer 31 of the filter element assembly 3, enters the drain cavity 300, is separated by the drain net 33, enters the oil purification cavity 200, then flows into the check valve channel 14 through the second central channel 400, the first central channel 151 and the second oil inlet 141 in sequence, pushes the umbrella cover portion of the valve sheet 72 of the check valve 7 open, flows to the oil outlet pipe 12 through the hollow portion 712 and the second oil outlet 142, and flows out from the open end of the oil outlet pipe 12.

(2) When the electric pump works, at the moment, the one-way valve 7 is in a closed state under the suction effect of the oil suction port of the electric pump 6, and the one-way valve channel 14 is disconnected; as shown by arrows in fig. 4, fuel enters from the open end of the oil inlet pipe 11, is heated by the heater 4, enters the dirty oil chamber 100 in the housing 2, is filtered by the filter paper layer 31 of the filter element assembly 3, enters the drain chamber 300, is separated by the drain net 33, enters the clean oil chamber 200, flows into the oil inlet chamber 131 of the electric pump channel 13 through the second central channel 400, the first central channel 151 and the first oil inlet 132 in sequence, flows into the oil outlet chamber 133 of the electric pump channel 13 through the electric pump 6, flows into the oil outlet pipe 12 from the first oil outlet 134, and flows out from the open end of the oil outlet pipe 12.

The foregoing description is illustrative of the present invention and is not to be construed as limiting thereof, as the invention may be modified in any manner without departing from the spirit thereof.

Claims

1. The utility model provides a fuel filter, includes base (1), shell (2), filter core assembly (3), its characterized in that: the upper part of the base (1) is provided with an oil inlet pipe (11) and an oil outlet pipe (12), and the lower part of the base (1) is provided with a sleeve part (10); the shell (2) is connected to the sleeve part (10), the filter element assembly (3) is arranged in the shell (2), a dirty oil cavity (100) is formed in the shell (2) and located on the circumferential outer side of the filter element assembly (3), and a clean oil cavity (200) is formed in the filter element assembly (3);

a central vertical pipe (15) extends downwards from the base (1), the central vertical pipe (15) is provided with a vertical first central channel (151), and the first central channel (151) is communicated with a clean oil cavity (200);

an electric pump channel (13) is formed in the base (1), an electric pump (6) is inserted into the electric pump channel (13), a sealing element is arranged on the periphery of the middle of the electric pump (6), and a cavity of the electric pump channel (13) located on the outer side of the electric pump (6) is divided into an oil inlet cavity (131) and an oil outlet cavity (133); on the base (1), a first oil inlet (132) is formed in the first central channel (151) and communicated with the oil inlet cavity (131), and a first oil outlet (134) is formed in the first central channel and communicated with the oil outlet cavity (133) and the oil outlet pipe (12);

a one-way valve channel (14) is arranged on the base (1) and below the oblique side of the electric pump channel (13), the one-way valve channel (14) and the first central channel (151) have certain overlapping height in the longitudinal direction and are directly communicated through a second oil inlet (141), and a channel body of the one-way valve channel (14) is intersected with a channel body of the oil outlet pipe (12) to form a second oil outlet (142) for communicating the one-way valve channel (14) with the oil outlet pipe (12); a check valve (7) is arranged in the check valve channel (14) and positioned outside the second oil inlet (141).

2. A fuel filter according to claim 1 wherein: the check valve channel (14) is close to the upper end part of the first central channel (151) and is positioned on the inclined upper side of the first central channel (151), and the second oil inlet (141) is an inclined hole;

in a normal working state, the flow direction of fuel oil is as follows: the pipeline device comprises an oil inlet pipe (11) → a dirty oil cavity (100) → a clean oil cavity (200) → a first central passage (151) → a second oil inlet (141) → a one-way valve passage (14) → an oil outlet pipe (12);

when the electric pump works, the flow direction of fuel oil is as follows: the device comprises an oil inlet pipe (11) → a dirty oil cavity (100) → a clean oil cavity (200) → a first central channel (151) → a first oil inlet (132) → an oil inlet cavity (131) of an electric pump channel (13) → an oil outlet cavity (133) of the electric pump channel (13) → a first oil outlet (134) → an oil outlet pipe (12).

3. A fuel filter according to claim 1 wherein: a first convex ring (152) is protruded on the inner peripheral wall surface of the middle part of the central vertical pipe (15), and a first annular groove (153) is formed on the upper side of the first convex ring (152); the upper end of filter core assembly (3) stretches out and has cartridge portion (342), sets up a plurality of buckles (344) on cartridge portion (342), and buckle (344) of cartridge portion (342) and first bulge loop (152), first annular (153) of the vertical pipe (15) of central authorities form the joint structure, and filter core assembly (3) are through this joint structure chucking on base (1).

4. A fuel filter according to claim 1 wherein: a step surface (143) is arranged on the inner peripheral wall surface of the middle part of the one-way valve channel (14), and the step surface (143) is positioned between the second oil inlet (141) and the second oil outlet (142); the plug (71) of the one-way valve (7) presses the valve seat (73) on the step surface (143) of the one-way valve channel (14), and the valve plate (72) penetrates through the valve seat (73).

5. A fuel filter according to claim 4 wherein: a connecting portion (711), a hollow portion (712) and a pressing portion (713) are sequentially arranged from outside to inside of a plug (71) of the one-way valve (7), the connecting portion (711) is fixedly connected in the one-way valve channel (14), the hollow portion (712) is correspondingly located at the second oil outlet (142) and conducts the oil outlet pipe (12) and the one-way valve channel (14), and the pressing portion (713) is pressed on the end face of the valve seat (73).

6. A fuel filter according to claim 1 wherein: a heater (4) is arranged in the base (1) and above the filter element assembly (3), and the heater (4) comprises a heater seat (41), a heating sheet (43), a heat conducting sheet (44) and a plug connector (46); the base (1) is provided with a plug connector penetrating hole (16), and the plug connector (46) of the heater (4) penetrates out from the plug connector penetrating hole (16).

7. A fuel filter according to claim 1 wherein: the electric pump channel (13) is parallel to the one-way valve channel (14); the inner side surfaces and the peripheral surfaces of the electric pump channel (13) and the one-way valve channel (14) are closed.

8. A fuel filter according to claim 1 wherein: one end of the oil inlet pipe (11) and one end of the oil outlet pipe (12) are open, the other end of the oil inlet pipe and the oil outlet pipe are sealed by adopting a plug and a sealing piece, and the open ends of the oil inlet pipe (11) and the oil outlet pipe (12) are positioned on two opposite sides or on the same side.

9. A fuel filter according to claim 1 wherein: the cavity in the shell (2) and below the filter element assembly (3) is a water collecting cavity (500), a water level sensor assembly (5) is arranged at the bottom of the shell (2), and a sensing part of the water level sensor assembly (5) extends into the water collecting cavity (500).

10. A fuel filter according to claim 1 wherein: a filter paper layer (31) of the filter element assembly (3) is sleeved on a framework (32), an upper end cover (34) and a lower end cover (35) are arranged at the upper end and the lower end of the filter paper layer (31), a hydrophobic net (33) is inserted in the center of the framework (32), an internal cavity of the hydrophobic net (33) is an oil purifying cavity (200), and a cavity between the outer surface of the hydrophobic net (33) and the inner surface of the framework (32) is a hydrophobic cavity (300); a drain hole (351) is formed in the center of the lower end cover (35), and the drain hole (351) is communicated with the drainage cavity (300) and the water collecting cavity (500).