Fuel filter assembly with electric oil self-absorption function

Abstract

The utility model discloses a fuel filter assembly with an electric self-oil-absorption function, which relates to the technical field of vehicle fuel filter systems and comprises a filter seat, an electric self-oil-absorption component, a middle shell, a filter element component and a maintenance lower cover component. The filter seat is provided with a first oil cavity, a second oil cavity, an oil inlet and an oil outlet. The second oil cavity is divided into an oil suction cavity and an oil outlet cavity by the electric self-oil-suction assembly, and the oil outlet is communicated with the oil outlet cavity. And the inner cavity of the middle shell is divided into a pre-filtering cavity and a post-filtering cavity by the filter element assembly. The before-filtering cavity is communicated with the first oil cavity, and the after-filtering cavity is respectively communicated with the oil suction cavity and the oil outlet cavity. A one-way valve is arranged in a passage of the after-filtering cavity and the oil outlet cavity so as to allow fuel oil to flow to the oil outlet cavity from the after-filtering cavity in a one-way mode. The maintenance lower cover assembly is used for discharging water filtered out by the filter element assembly. According to the fuel filter assembly with the electric self-oil-absorption function, automatic oil pumping can be achieved, fatigue of manual oil pumping is relieved, and meanwhile the starting capacity and operation stability of an engine are improved in an auxiliary mode.

Description

TECHNICAL FIELD

[0001] The utility model relates to vehicle fuel filter system technical field, in particular to a kind of fuel filter assembly with electric self oil suction function. BACKGROUND

[0002] Fuel filter assembly with electric self oil suction function is important component for maintaining engine high efficiency, stable operation, its main role is to provide clean fuel for the combustion system of engine.

[0003] Oil filling is carried out to newly replaced fuel filter, which is a routine operation before engine starting. At present, small and medium power models of light trucks are mostly manually self-oil suction, and oil suction needs to be repeatedly pressed on diaphragm type manual pump of fuel filter assembly with electric self oil suction function, which has the characteristics of narrow operation space, complicated operation procedure, multiple oil pumping times and strong artificial fatigue. UTILITY MODEL CONTENTS

[0004] The utility model aims at providing a kind of fuel filter assembly with electric self oil suction function to solve the problems of the above-mentioned related technology, alleviate the fatigue of artificial oil pumping, and auxiliary improve the starting ability and running stability of engine.

[0005] To achieve the above-mentioned purpose, the utility model provides the following scheme:

[0006] The utility model discloses a kind of fuel filter assembly with electric self oil suction function, comprising:

[0007] Filter seat, the filter seat has first oil cavity, second oil cavity, oil inlet, oil outlet and installation port, the first oil cavity is separated from the second oil cavity, the oil inlet is communicated with the first oil cavity, the oil outlet is communicated with the second oil cavity;

[0008] Electric self-oil suction component, the electric self-oil suction component is located in the second oil cavity, and the second oil cavity is divided into oil suction cavity and oil outlet cavity;The oil outlet is communicated with the oil outlet cavity, the inlet of the electric self-oil suction component is located in the oil suction cavity, and the outlet of the electric self-oil suction component is located in the oil outlet cavity;The installation port is used to take and place the electric self-oil suction component;

[0009] Middle shell, the first end of the middle shell is connected to the filter seat;

[0010] Filter core component, the filter core component is located in the middle shell, and the inner cavity of the middle shell is divided into filter front cavity and filter rear cavity;The filter front cavity is communicated with the first oil cavity, and the filter rear cavity is communicated with the oil suction cavity and the oil outlet cavity respectively;One-way valve is arranged in the passageway between the filter rear cavity and the oil outlet cavity, to allow fuel to flow from the filter rear cavity to the oil outlet cavity in one direction;

[0011] A maintenance lower cover assembly is connected to the second end of the middle housing for discharging water filtered by the filter element assembly.

[0012] Preferably, the filter seat further has a first heater connecting port for connecting a first heater.

[0013] Preferably, the electric self-suction oil assembly comprises a motor, a first sealing ring, a second sealing ring, an oil suction pump core, and a controller; the first sealing ring is sleeved outside the motor and sealingly connected with the inner wall of the second oil cavity, for separating the second oil cavity into the oil suction cavity and the oil outlet cavity; the second sealing ring is located in the oil outlet cavity and sleeved outside the controller, for preventing fuel from leaking from the mounting port; the oil suction pump core is connected to one end of the motor located in the oil suction cavity, and the controller is connected to one end of the motor located in the oil outlet cavity.

[0014] Preferably, the controller comprises a bracket, a circuit board, and a decorative cover; the bracket has a recess for accommodating the circuit board, and the decorative cover covers the recess; the bracket is provided with a plug-in port for enabling an external device to electrically connect the circuit board through the plug-in port; the bracket is provided with a wire outlet through which a wire passes, and two ends of the wire are electrically connected to the motor and the circuit board, respectively.

[0015] Preferably, the electric self-suction oil assembly further comprises a first sealing ring mounting bracket which is a hollow cylindrical structure and is provided with a second filter layer in the hollow part; the first sealing ring is sleeved outside the first sealing ring mounting bracket, and the first sealing ring mounting bracket is sleeved outside the motor and axially limited; the second filter layer is located on the side of the first sealing ring close to the oil outlet cavity and between the outlet of the electric self-suction oil assembly and the oil outlet.

[0016] Preferably, the middle housing has a connecting portion for fixedly connecting with an adjacent component.

[0017] Preferably, the middle housing is threadedly connected with the maintenance lower cover assembly and sealingly connected through a third sealing ring.

[0018] Preferably, the filter element assembly comprises a support cylinder, a first filter layer, an upper cover, a lower cover, a fourth sealing ring, and a fifth sealing ring; the first filter layer is attached to the support cylinder, two ends of the support cylinder are connected with the upper cover and the lower cover, respectively, the fourth sealing ring is sleeved outside the upper cover for abutting against the inner wall of the second oil cavity, and the fifth sealing ring is sleeved outside the lower cover for abutting against the inner wall of the maintenance lower cover assembly.

[0019] Preferably, the first filter layer comprises, from outside to inside, an impurity filter layer, a water droplet coalescing layer and a water bead hydrophobic layer.

[0020] Preferably, the maintenance lower cover assembly comprises a sixth sealing ring, a maintenance lower cover, a water drain valve, a water level sensor connecting port and a second heater connecting port; the maintenance lower cover has a water storage cavity, and an outer side of the maintenance lower cover is provided with a connecting thread, a sealing ring mounting groove, a water drain port, the second heater connecting port and the water level sensor connecting port; the connecting thread is used for connecting the middle shell, the sixth sealing ring is used for sealing a gap between the maintenance lower cover and the middle shell; the water drain valve is mounted on the maintenance lower cover, the second heater connecting port is used for connecting a second heater, and the water level sensor connecting port is used for connecting a water level sensor.

[0021] The utility model discloses relative to relevant technical achievement following technical effect has been obtained:

[0022] 1, electric self -priming oil assembly has the characteristics such as small size, light weight, low cost with the traditional product on the market, and the oil absorption characteristic presented in the fuel system is more in line with the operation requirement of light truck and small and medium power engine;

[0023] 2, the operation mode of electric self -priming oil assembly is intelligent operation control, and its operation state can be controlled differently in combination with the physical characteristics of different fuel systems.

[0024] 3, the by-pass oil circuit is set up in electric self -priming oil assembly, and low noise smooth operation of motor and oil pump core under extreme condition can be realized, and higher hearing comfort requirement is met.

[0025] 4, the fuel flow passage in filter seat assembly adopts double channel design, and the oil supply state of two kinds of working states does not affect each other, and the above design can effectively reduce the fluid resistance of fuel system, improve fuel flow smoothness, prolong the service life of filter core and reduce oil consumption.

[0026] 5, the fuel filter assembly with electric self -priming oil function is arranged in light truck or small and medium power engine, and the starting performance of engine can be effectively improved, and the one-time starting success rate under the adverse conditions such as high oil viscosity and poor oil flowability under low temperature working condition can be improved. BRIEF DESCRIPTION OF DRAWINGS

[0027] In order to more clearly illustrate the technical scheme in the embodiments of the utility model or related technologies, the drawings needed in the embodiments will be briefly introduced as follows, and obviously, the drawings in the following description are only some embodiments of the utility model, and other drawings can be obtained according to these drawings without creative labor for those skilled in the art.

[0028] Figure 1It is a front view of a fuel filter assembly with electric self-oil pumping function.

[0029] Figure 2 It is a top view of a filter seat.

[0030] Figure 3 It is a left view of the position relationship between the filter seat and the electric self-oil pumping assembly.

[0031] Figure 4 It is a left view of the electric self-oil pumping assembly.

[0032] Figure 5 It is a front view of a filter element assembly.

[0033] Figure 6 It is a front view of a maintenance lower cover assembly.

[0034] Figure 7 It is a schematic view of a first sealing ring mounting bracket.

[0035] In the figure: 1-filter seat; 2-electric self-oil pumping assembly; 3-middle shell; 4-filter element assembly; 5-maintenance lower cover assembly; 10-second oil cavity; 11-first oil cavity; 12-oil suction cavity; 13-oil outlet cavity; 14-oil inlet; 15-oil outlet; 16-mounting port; 17-first heater connecting port; 18-screw; 19-one-way valve; 20-first sealing ring mounting bracket; 21-motor; 22-first sealing ring; 23-second sealing ring; 24-oil suction pump core; 25-controller; 26-bracket; 27-circuit board; 28-decorative cover; 29-plug-in port; 41-supporting cylinder; 42-first filter layer; 43-upper cover; 44-lower cover; 45-fourth sealing ring; 46-fifth sealing ring; 47-impurity filter layer; 48-water droplet coalescence layer; 49-water bead hydrophobic layer; 51-third sealing ring; 52-maintenance lower cover; 53-drain valve; 54-water level sensor connecting port; 55-second heater connecting port. DETAILED DESCRIPTION

[0036] The technical solutions in the embodiments of the utility model will be clearly and completely described below with reference to the drawings in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, rather than all the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by those skilled in the art without creative labor fall within the protection scope of the utility model.

[0037] The utility model discloses a fuel filter assembly with electric self-oil pumping function to solve the problems in the above-mentioned related technologies, alleviate the fatigue of manual oil pumping, and auxiliary improve the starting ability and running stability of the engine.

[0038] In order to make the above-mentioned purposes, features and advantages of the present application more obvious and easy to understand, the present application will be further described in detail below in combination with the drawings and specific embodiments.

[0039] With reference to Figures 1-6 The embodiment provides a fuel filter assembly with an electric self-oil-pumping function, which comprises a filter seat 1, an electric self-oil-pumping assembly 2, a middle shell 3, a filter core assembly 4 and a maintenance lower cover assembly 5.

[0040] The filter seat 1 is provided with a first oil cavity 11, a second oil cavity 10, an oil inlet 14, an oil outlet 15 and a mounting port 16. The first oil cavity 11 is separated from the second oil cavity 10. The oil inlet 14 is communicated with the first oil cavity 11, and the oil outlet 15 is communicated with the second oil cavity 10. The oil inlet 14 is connected with a fuel tank through an oil inlet pipe, and the oil outlet 15 is connected with an engine through an oil outlet pipe. The connection mode of the interface and the pipeline can be rotary friction welding, reverse clamping or other connection modes.

[0041] The electric self-oil-pumping assembly 2 is located in the second oil cavity 10 and separates the second oil cavity 10 into an oil suction cavity 12 and an oil outlet cavity 13. Apparently, the oil suction cavity 12 and the oil outlet cavity 13 are both annular cavities. The oil outlet 15 is communicated with the oil outlet cavity 13. The inlet of the electric self-oil-pumping assembly 2 is located in the oil suction cavity 12, and the outlet of the electric self-oil-pumping assembly 2 is located in the oil outlet cavity 13. The mounting port 16 is used for taking and placing the electric self-oil-pumping assembly 2.

[0042] The first end of the middle shell 3 is connected with the filter seat 1. The filter core assembly 4 is located in the middle shell 3 and separates the inner cavity of the middle shell 3 into a pre-filter cavity and a post-filter cavity. The pre-filter cavity is communicated with the first oil cavity 11, and the post-filter cavity is communicated with the oil suction cavity 12 and the oil outlet cavity 13 respectively. A one-way valve 19 is arranged in the passage between the post-filter cavity and the oil outlet cavity 13, so as to allow the fuel to flow from the post-filter cavity to the oil outlet cavity 13 in one direction. The maintenance lower cover assembly 5 is connected with the second end of the middle shell 3 and is used for discharging the moisture filtered by the filter core assembly 4. In the embodiment, the lower part of the filter seat 1 is provided with an inner pipeline and an outer pipeline, and the inner pipeline and the outer pipeline are arranged concentrically. The post-filter cavity is communicated with the oil outlet cavity 13 through the inner pipeline, the post-filter cavity is communicated with the oil suction cavity 12 through the outer pipeline, and the one-way valve 19 is located on the inner side of the inner pipeline.

[0043] The working principle of the fuel filter assembly with the electric self-oil-pumping function in the embodiment is as follows:

[0044] Fuel provided by the fuel tank reaches the first oil cavity 11 through the fuel inlet pipe and the fuel inlet 14, and then flows to the pre-filter cavity in the middle shell 3, and reaches the post-filter cavity after being filtered by the filter element assembly 4. If the electric self-suction oil assembly 2 is in the working state, the fuel in the post-filter cavity enters the oil suction cavity 12, and then is pumped to the oil outlet cavity 13 by the electric self-suction oil assembly 2, and finally is delivered to the engine through the oil outlet 15 and the oil outlet pipe. If the electric self-suction oil assembly 2 is in the shutdown state and the engine is in the working state, the fuel in the post-filter cavity enters the oil outlet cavity 13, and then is delivered to the engine through the oil outlet 15 and the oil outlet pipe.

[0045] The embodiment can realize low-noise and stable operation of the electric self-suction oil assembly 2 under extreme working conditions, and meet higher hearing comfort requirements, by arranging two branches so that the filtered fuel can be delivered to the engine through the two branches. Meanwhile, the oil supply states of the two branches do not affect each other, which can effectively reduce the fluid resistance of the fuel system, improve the flow smoothness of the fuel, prolong the service life of the filter element, and reduce fuel consumption. Therefore, the fuel filter assembly with the electric self-suction oil function is suitable for light trucks or small and medium power engines, can effectively improve the starting performance of the engine, and improve the one-time starting success rate under adverse conditions such as high viscosity of oil under low temperature working condition and poor flowability of oil.

[0046] As a possible example, in the embodiment, the filter seat 1 also has a first heater connecting port 17 for connecting a first heater. The first heater is used to heat the fuel in the first oil cavity 11 in the filter seat 1, so as to improve the flowability of the fuel in the filter seat 1 and avoid the fuel from freezing and blocking the filter seat 1.

[0047] As a possible example, in the embodiment, the electric self-suction oil assembly 2 includes a motor 21, a first sealing ring 22, a second sealing ring 23, an oil suction pump core 24, and a controller 25. The first sealing ring 22 is sleeved outside the motor 21 and is in sealing connection with the inner wall of the second oil cavity, and is used to separate the second oil cavity into the oil suction cavity 12 and the oil outlet cavity 13. The second sealing ring 23 is located in the oil outlet cavity 13 and is sleeved outside the controller 25, and is used to prevent fuel from leaking from the mounting port 16. The oil suction pump core 24 is connected to one end of the motor 21 located in the oil suction cavity 12, and the controller 25 is connected to one end of the motor 21 located in the oil outlet cavity 13. The oil suction pump core 24 is eccentrically arranged inside, and rotates with the motor 21 under the action of the central transmission shaft, and realizes the functions of external oil suction and internal oil pressure when the oil suction pump core 24 rotates. The inlet of the electric self-suction oil assembly 2 is located on the oil suction pump core 24, and the outlet of the electric self-suction oil assembly 2 is located on the shell of the motor 21.

[0048] As a possible example, in the embodiment, the controller 25 comprises a bracket 26, a circuit board 27 and a decorative cover 28. The bracket 26 has a recess for accommodating the circuit board 27, and the decorative cover 28 covers the recess. The bracket 26 is left with a plug interface 29 to enable an external device to electrically connect the circuit board 27 through the plug interface 29. The bracket 26 is left with a wire outlet through which a wire is passed, and the two ends of the wire are electrically connected to the motor 21 and the circuit board 27, respectively. The recess and the decorative cover 28 form a relatively closed inner cavity to protect the circuit board 27. The bracket 26 is welded to the decorative cover 28. The outer side of the bracket 26 is provided with a recess for mounting the second sealing ring 23, and the second sealing ring 23 is used for sealing connection with the inner wall of the second oil cavity to avoid fuel leakage from the gap between the filter seat 1 and the controller 25.

[0049] The circuit board 27 can be pre-set with the running mode of the motor 21, or the running of the motor 21 can be controlled by an external control signal transmitted through the plug interface 29. After the electric self-suction oil assembly 2 is placed into the filter seat 1 through the mounting port 16, the bracket 26 is fixed to the end face of the filter seat 1 through the screw 18 to realize the positioning of the electric self-suction oil assembly 2.

[0050] As a possible example, in the embodiment, the electric self-suction oil assembly 2 further comprises a first sealing ring mounting bracket 20, which is a hollow cylindrical structure, and the hollow part is provided with a second filter layer. The first sealing ring sleeve 22 is arranged on the outer side of the first sealing ring mounting bracket 20, and the first sealing ring mounting bracket 20 is sleeved on the outer side of the motor 21 and axially limited. The second filter layer is located on the side of the first sealing ring close to the oil outlet cavity, and between the outlet of the electric self-suction oil assembly and the oil outlet. The second filter layer is used for secondary filtering of the fuel delivered by the electric self-suction oil assembly 2 to avoid the pollutants generated by mechanical wear of the electric self-suction oil assembly 2 from entering the engine through the oil outlet 15, thereby ensuring the performance of the engine. The second filter layer is uniformly distributed along the circumferential direction of the first sealing ring mounting bracket 20 to avoid blocking the oil.

[0051] As a possible example, in the embodiment, the middle shell 3 has a connecting part to realize fixed connection with adjacent parts. For example, the connecting part can be a hanging ear or a transition bracket, as long as it can realize fixed connection.

[0052] As a possible example, in the embodiment, the middle shell 3 is threadedly connected with the maintenance lower cover assembly 5, and sealing is realized through the third sealing ring 51.

[0053] As a possible example, in the embodiment, the filter core assembly 4 comprises a support cylinder 41, a first filter layer 42, an upper cover 43, a lower cover 44, a fourth sealing ring 45 and a fifth sealing ring 46. The first filter layer 42 is attached to the support cylinder 41, the two ends of the support cylinder 41 are connected to the upper cover 43 and the lower cover 44 respectively, the fourth sealing ring 45 is sleeved outside the upper cover 43 and is used for abutting against the inner wall of the second oil cavity 10. The fifth sealing ring 46 is sleeved outside the lower cover 44 and is used for abutting against the inner wall of the maintenance lower cover assembly 5. As an example, the support cylinder 41 is adhesively connected to the first filter layer 42, the support cylinder 41 is adhesively connected to the upper cover 43, and the support cylinder 41 is adhesively connected to the lower cover 44, so as to improve the integrity of the filter core assembly 4.

[0054] As a possible example, in the embodiment, the first filter layer 42 comprises, from outside to inside, a impurity filter layer 4742, a water droplet coalescence layer 48 and a water bead hydrophobic layer 49. The impurity filter layer 4742 can filter particulate matters in the fuel oil, the water droplet coalescence layer 48 can coalesce small-particle-size water molecules in the fuel oil, and the water bead hydrophobic layer 49 is made of oleophilic hydrophobic material. The separated clean fuel oil enters the oil suction cavity 12 or the oil outlet cavity 13, and the water enters the maintenance lower cover assembly 5 after being separated and is discharged by the maintenance lower cover assembly 5. According to different actual needs, those skilled in the art can also select other types of first filter layers 42.

[0055] As a possible example, in the embodiment, the maintenance lower cover assembly 5 comprises a maintenance lower cover 52, a water drain valve 53, a water level sensor connecting port 54 and a second heater connecting port 55. The maintenance lower cover 52 has a water storage cavity, and the outer side of the maintenance lower cover 52 is provided with a connecting thread, a sealing ring mounting groove, a water drain port, the second heater connecting port 55 and the water level sensor connecting port 54. The connecting thread is used for connecting the middle shell 3, and the third sealing ring 51 is used for sealing the gap between the maintenance lower cover 52 and the middle shell 3. The water drain valve 53 is installed on the maintenance lower cover 52, the second heater connecting port 55 is used for connecting the second heater, and the water level sensor connecting port 54 is used for connecting the water level sensor. The water drain valve 53 can be a manual water drain valve or an electromagnetic automatic water drain valve. The water level sensor can convert the water level height in the maintenance lower cover 52 into an electrical signal and transmit it to the vehicle instrument, or can transmit the water level signal to the integrated controller 25 while displaying the water level, and control the opening and closing of the electromagnetic automatic water drain valve through the integrated controller 25. The maintenance lower cover 52 contains a small amount of fuel oil while containing water, and heating the maintenance lower cover 52 by the second heater can improve the fluidity of the liquid and avoid the liquid from freezing and blocking the electromagnetic automatic water drain valve. In order to improve the sealing performance, sealing rings should be arranged at the installation positions of the water drain valve 53 and the water level sensor connecting port 54.

[0056] In this embodiment, the lower cover 52 and the middle housing 3 are in a split structure and are threadedly connected. However, the actual implementation is not limited thereto. For example, the two can also be in an integrated structure.

[0057] The principle and implementation mode of the utility model are described by applying specific examples in the utility model, and the above embodiment is only used for helping to understand the method and core idea of the utility model; meanwhile, for the general technical personnel in the field, the specific implementation mode and application range will be changed according to the idea of the utility model. In conclusion, the content of the specification should not be understood as the limitation of the utility model.

Claims

1. A fuel filter assembly having an electrically powered self-priming function, characterized by, The filter seat has a first oil cavity, a second oil cavity, an oil inlet, an oil outlet and a mounting port, the first oil cavity is separated from the second oil cavity, the oil inlet communicates with the first oil cavity, and the oil outlet communicates with the second oil cavity. The electric self-suction oil assembly is located in the second oil cavity and separates the second oil cavity into an oil suction cavity and an oil outlet cavity; the oil outlet communicates with the oil outlet cavity, the inlet of the electric self-suction oil assembly is located in the oil suction cavity, the outlet of the electric self-suction oil assembly is located in the oil outlet cavity; the mounting port is used for taking and placing the electric self-suction oil assembly. The middle shell is connected to the filter seat at a first end. The filter core assembly is located in the middle shell and separates the inner cavity of the middle shell into a pre-filter cavity and a post-filter cavity; the pre-filter cavity communicates with the first oil cavity, the post-filter cavity communicates with the oil suction cavity and the oil outlet cavity respectively; a one-way valve is arranged in the passage between the post-filter cavity and the oil outlet cavity to allow the fuel to flow from the post-filter cavity to the oil outlet cavity in one direction. The maintenance lower cover assembly is connected to a second end of the middle shell and is used for discharging the moisture filtered by the filter core assembly. The filter seat further has a first heater connecting port for connecting a first heater.

2. The fuel filter assembly with electrically powered self-priming function according to claim 1, characterized in that: The electric self-suction oil assembly includes a motor, a first sealing ring, a second sealing ring, an oil suction pump core and a controller; the first sealing ring is sleeved outside the motor and is in sealing connection with the inner wall of the second oil cavity, so as to separate the second oil cavity into the oil suction cavity and the oil outlet cavity; the second sealing ring is located in the oil outlet cavity and is sleeved outside the controller, so as to prevent fuel from leaking from the mounting port; the oil suction pump core is connected to one end of the motor located in the oil suction cavity, and the controller is connected to one end of the motor located in the oil outlet cavity.

3. The fuel filter assembly with electrically powered self-priming function according to claim 1, characterized in that: The controller includes a support, a circuit board and a decorative cover; the support has a recess for accommodating the circuit board, and the decorative cover covers the recess; the support is provided with a plug-in port, so that an external device can be electrically connected to the circuit board through the plug-in port; the support is provided with a wire outlet through which a wire passes, and two ends of the wire are electrically connected to the motor and the circuit board respectively.

4. The fuel filter assembly with electrically powered self-priming function according to claim 3, characterized in that: The electric self-suction oil assembly further includes a first sealing ring mounting support which is a hollow cylindrical structure and is provided with a second filter layer; the first sealing ring is sleeved outside the first sealing ring mounting support, and the first sealing ring mounting support is sleeved outside the motor and is axially limited; the second filter layer is located on the side of the first sealing ring close to the oil outlet cavity and between the outlet of the electric self-suction oil assembly and the oil outlet.

5. The fuel filter assembly with electrically powered self-priming function according to claim 3, characterized in that: The middle shell has a connecting portion to realize fixed connection with adjacent components.

6. The fuel filter assembly with electrically powered self-priming function according to claim 1, characterized in that: The middle shell is threadedly connected to the maintenance lower cover assembly and is sealed by a third sealing ring.

7. The fuel filter assembly with electrically powered self-priming function according to claim 1, characterized in that: ​ 8. The fuel filter assembly with electrically powered self-priming function according to claim 1, characterized in that: The filter core assembly comprises a supporting cylinder, a first filter layer, an upper cover, a lower cover, a fourth sealing ring and a fifth sealing ring; the first filter layer is attached to the supporting cylinder, two ends of the supporting cylinder are connected to the upper cover and the lower cover respectively, the fourth sealing ring is sleeved outside the upper cover and used for abutting to the inner wall of the second oil cavity, and the fifth sealing ring is sleeved outside the lower cover and used for abutting to the inner wall of the maintenance lower cover assembly.

9. The fuel filter assembly with electrically powered self-priming function according to claim 8, characterized in that: The first filter layer comprises, from outside to inside, an impurity filter layer, a water droplet coalescence layer and a water bead hydrophobic layer.

10. The fuel filter assembly with electrically powered self-priming function according to claim 1, wherein: The maintenance lower cover assembly comprises a sixth sealing ring, a maintenance lower cover, a water drain valve, a water level sensor connecting port and a second heater connecting port; the maintenance lower cover has a water storage cavity, and the outer side of the maintenance lower cover is provided with a connecting thread, a sealing ring mounting groove, a water drain port, the second heater connecting port and the water level sensor connecting port; the connecting thread is used for connecting the middle shell, the sixth sealing ring is used for sealing the gap between the maintenance lower cover and the middle shell, the water drain valve is mounted on the maintenance lower cover, the second heater connecting port is used for connecting a second heater, and the water level sensor connecting port is used for connecting a water level sensor.

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