Diesel oil filtering module

Abstract

The invention discloses a diesel oil filtering module, which comprises a shell, an oil inlet, an oil outlet, an oil inlet, an oil outlet and a filter, the oil inlet is used for inputting to-be-filtered diesel oil, the oil outlet is used for outputting filtered diesel oil, and an outlet switch valve is arranged at the oil outlet; the filter is accommodated in the shell and is used for filtering the diesel oil to be filtered so as to separate water from the diesel oil to be filtered, so that the separated water is accumulated in the shell; a water discharge device having a water discharge line for discharging water accumulated in the housing; the electronic pump is installed on the shell and used for injecting diesel oil to be filtered into the shell from the oil inlet, the diesel oil filtering module has a drainage mode, when water accumulated in the shell needs to be drained, the drainage mode is started, the electronic pump operates at first power, the outlet switch valve is configured to close the oil outlet, and the electronic pump operates at second power when water accumulated in the shell needs to be drained. Therefore, water in the shell is automatically drained through the drainage pipeline. According to the diesel oil filtering module, automatic drainage is achieved through cooperation of the electronic pump and the outlet switch valve, and drainage timeliness and drainage efficiency are improved.

Description

Technical Field

[0001] The present invention relates to the field of fuel systems, and more particularly, to a diesel filtration module. Background Art

[0002] Currently, in a diesel filtration module, when water in the housing needs to be drained, generally, the user manually opens the drain valve of the housing, or an additional solenoid valve is provided to achieve gravity drainage. This drainage method of the prior art requires manual operation, resulting in possible failure to drain water in a timely manner and low drainage efficiency. Summary of the Invention

[0003] The present invention aims to provide a diesel filtration module that can solve the above problems, which improves the timeliness and efficiency of drainage, is convenient to operate, and has a reasonable layout.

[0004] According to one aspect of the present invention, there is provided a diesel filtration module, which includes: a housing having an oil inlet for inputting diesel to be filtered and an oil outlet for outputting filtered diesel, and an outlet switch valve is provided at the oil outlet; a filter accommodated in the housing for filtering the diesel to be filtered to separate water from the diesel to be filtered, so that the separated water accumulates in the housing; a drainage device having a drainage pipeline for draining the water accumulated in the housing; and an electronic pump installed in the housing, the electronic pump is used to inject the diesel to be filtered from the oil inlet into the housing, wherein the diesel filtration module has a drainage mode, when it is necessary to drain the water accumulated in the housing, the drainage mode is started, the electronic pump operates at a first power, and the outlet switch valve is configured to close the oil outlet, so that the water in the housing is automatically drained through the drainage pipeline.

[0005] With this arrangement, the diesel filtration module of the present invention realizes the drainage function by directly controlling the electronic pump by setting the working mode of the electronic pump and cooperating with the outlet switch valve, etc., improving the degree of automation.

[0006] In an exemplary embodiment, the outlet switch valve is a spring-loaded mechanical valve, one end of the mechanical valve is connected to the negative pressure side of the electronic pump, and the other end of the mechanical valve is connected to the positive pressure side of the electronic pump, so that when the electronic pump operates at the first power, the pressure difference between one end and the other end of the mechanical valve increases to be sufficient to overcome the spring force of the mechanical valve, thereby closing the oil outlet by the mechanical valve.

[0007] With this arrangement, the spring-loaded mechanical valve of the present invention can be operated by the electronic pump operating in a specific manner, with fast response and good operation stability.

[0008] In an exemplary embodiment, the filter includes a hollow cylindrical shape surrounded by a filter material. The filter is inserted into the hollow space of the housing. A dirty side of the filter for receiving the diesel to be filtered is defined between the inner circumference of the housing and the outer circumference of the filter, and a clean side of the filter is defined in the internal space of the filter. Wherein, an oil outlet hole for the filtered diesel to flow out is formed at the upper end of the hollow cylindrical shape, and the oil outlet hole is in fluid communication with the oil outlet of the housing. Wherein, the negative pressure side of the electronic pump is connected to the oil inlet of the housing, and the positive pressure side of the electronic pump is connected to the dirty side of the filter inside the housing. The outlet switch valve is arranged in a valve installation area of the housing that connects the oil outlet hole and the oil outlet.

[0009] With this arrangement, the filter and the outlet switch valve of the diesel filtration module of the present invention are reasonably arranged at appropriate positions in the housing, facilitating layout and assembly.

[0010] In an exemplary embodiment, the valve installation area is arranged vertically in the housing, above the oil outlet hole of the filter and below the electronic pump. A communication path leading to the negative pressure side of the electronic pump is provided at a position of the valve installation area close to the electronic pump. Wherein, the outlet switch valve is arranged vertically in the valve installation area. The upper end of the outlet switch valve is connected to the negative pressure side of the electronic pump via the communication path, and the lower end of the outlet switch valve is connected to the clean side of the filter.

[0011] With this arrangement, the valve installation area and the outlet switch valve of the diesel filtration module of the present invention are reasonably arranged at appropriate positions in the housing, facilitating layout and assembly.

[0012] In an exemplary embodiment, the diesel filtration module has an oil filling and exhaust mode. In the oil filling and exhaust mode, the electronic pump operates at a second power, and the second power is less than the first power. When the electronic pump operates at the second power, the mechanical valve does not close the oil outlet but keeps the oil outlet open. The electronic pump sucks the diesel to be filtered from the oil inlet into the filter to fill the pipeline on the downstream side of the filter with diesel.

[0013] With this arrangement, the diesel filtration module of the present invention realizes multiple working modes by using an electronic pump, significantly improving the degree of automation.

[0014] In an exemplary embodiment, the oil filtration module further has a normal working mode. In the normal working mode, the electronic pump stops working, and the diesel to be filtered bypasses the electronic pump from the oil inlet and enters the dirty side of the filter in the housing. After being filtered by the filter, it is discharged from the oil outlet through the opened outlet switch valve.

[0015] With this arrangement, the diesel filtration module of the present invention realizes multiple working modes, significantly improving the degree of automation.

[0016] In an exemplary embodiment, the diesel filtration module includes a water level sensor. The water level sensor includes a mounting body and a sensing element connected to each other. The sensing element of the water level sensor is disposed in the drain pipe for measuring the water level accumulated in the drain pipe.

[0017] With this arrangement, the diesel filtration module of the present invention realizes accurate measurement of the water level in the drain pipe by providing a water level sensor. And the water level sensor cooperates with the electronic pump and the outlet switch valve, significantly improving the degree of automation.

[0018] In an exemplary embodiment, the sensing element of the water level sensor includes two electrodes. The two electrodes are arranged at a predetermined position in the drain pipe that needs to give an alarm to detect whether the liquid where the two electrodes are immersed is water or diesel based on the different resistances of diesel and water. If water is detected, an alarm is given and the electronic pump is started to operate at the first power.

[0019] With this arrangement, the diesel filtration module of the present invention can quickly and accurately measure the water level in the drain pipe through the reasonable arrangement of the water level sensor. And the water level sensor cooperates with the electronic pump and the outlet switch valve, significantly improving the degree of automation.

[0020] In an exemplary embodiment, the housing includes a body part and a head part connected to each other. Wherein, the filter is accommodated in the space in the body part; wherein, the outlet switch valve, the mounting body of the water level sensor, and the electronic pump are all installed in the head part; and wherein, a first oil inlet passage and a second oil inlet passage communicating with the oil inlet are formed in the head part. The first oil inlet passage leads to the electronic pump, and the second oil inlet passage leads to the area around the filter for receiving the diesel to be filtered.

[0021] With this arrangement, many components of the diesel filtration module of the present invention, especially the sensors, are integrated in the head part of the housing, which provides convenience for assembly and facilitates the replacement of the filter.

[0022] In an exemplary embodiment, the diesel fuel filtering module further includes an inlet check valve arranged in parallel with the electronic pump. The inlet check valve is configured such that when the fuel filtering module is in the normal operating mode, the diesel fuel to be filtered bypasses the electronic pump and enters the housing from the inlet port. When the electronic pump is operating, the inlet check valve prevents the diesel fuel to be filtered from flowing back.

[0023] With this arrangement, the diesel fuel filtering module of the present invention can operate more safely and reliably.

[0024] In an exemplary embodiment, the diesel fuel filtering module further includes a heater at an upstream position of the inlet check valve.

[0025] With this arrangement, the diesel fuel filtering module of the present invention can heat the diesel fuel to be filtered, providing fluidity and enabling the diesel fuel filtering module to operate more safely and reliably.

[0026] In an exemplary embodiment, the drain pipe extends vertically from the bottom of the housing to the upper region of the housing within the housing, and a drain check valve is provided at the drain outlet of the drain pipe. When the electronic pump operates at a first power, the water in the housing can automatically drain via the drain pipe by overcoming the resistance of the drain check valve.

[0027] With this arrangement, the drain pipe of the diesel fuel filtering module of the present invention makes full use of the space beside the filter within the housing, and the layout is more reasonable.

[0028] In an exemplary embodiment, a manual drain port is provided at the bottom of the housing, and a manual drain valve is provided at the manual drain port.

[0029] With this arrangement, the diesel fuel filtering module of the present invention can achieve manual drainage in case of emergency or other specific situations, providing flexibility in use.

[0030] In an exemplary embodiment, the diesel fuel filtering module further includes an electronic pump strainer upstream of the electronic pump.

[0031] With this arrangement, the diesel fuel filtering module of the present invention can filter the diesel fuel to be filtered flowing into the electronic pump, making the diesel fuel filtering module operate more safely and reliably.

[0032] In an exemplary embodiment, the outlet switch valve includes a movable valve body and a spring disposed on the valve body; wherein, the valve body has a first valve body portion for blocking the oil outlet when closed, a second valve body portion for supporting the spring, and an intermediate valve stem located between the first valve body portion and the second valve body portion; wherein, one end of the spring abuts against the surface of the valve mounting area of the housing, and the other end of the spring abuts against a bearing surface in a recessed mounting groove of the second valve body portion; the bearing surface is connected to the negative pressure side of the electronic pump and bears a first pressure, and the surface of the second valve body portion facing away from the bearing surface is connected to the positive pressure side of the electronic pump and bears a second pressure; wherein, when the electronic pump is closed or operates at a power lower than the first power, the pressure difference between the first pressure and the second pressure cannot overcome the spring force of the spring, and the position of the first valve body portion allows the oil outlet hole to be in fluid communication with the oil outlet of the housing; and wherein, when the electronic pump operates at the first power, the pressure difference between the first pressure and the second pressure overcomes the spring force of the spring, causing the first valve body portion to move to a position closing the oil outlet of the housing.

[0033] With this arrangement, the outlet switch valve of the diesel filtration module of the present invention is configured as a mechanical valve with a spring structure, which is particularly suitable for the installation space in the housing. This mechanical valve can respond quickly, has good operating stability, can simplify the control system, and is more competitive in terms of cost.

[0034] In summary, the oil filtration module according to the present invention can achieve the following beneficial technical effects superior to the prior art:

[0035] First: The diesel filtration module of the present invention realizes the drainage function by directly controlling the electronic pump through setting the working mode of the electronic pump and cooperating with the outlet switch valve and the quick-closing one-way valve in the drainage pipeline, improving the degree of automation.

[0036] Second, many components of the present invention, especially sensors, are integrated in the head portion of the housing, which provides convenience for assembly and facilitates the replacement of the filter.

[0037] Third, compared with the prior art where the position of the water storage area should be lower than the bottom of the housing, the present invention has no special requirements for the position of the water storage area, so it is more flexible in layout.

[0038] Fourth, when the engine starts, the drainage speed is significantly faster than drainage by gravity, so the timeliness of drainage is improved and the drainage speed is accelerated, and no air enters the filter. BRIEF DESCRIPTION OF THE DRAWINGS

[0039] The accompanying drawings described herein are used to provide a further understanding of the present application and form a part of the present application. The schematic embodiments of the present application and their descriptions are used to explain the present application and do not constitute an improper limitation of the present application. In the drawings:

[0040] Figure 1 is a schematic perspective view of an assembled diesel filtration module according to an exemplary embodiment of the present invention.

[0041] Figure 2 is a schematic perspective view of a disassembled diesel filtration module according to an exemplary embodiment of the present invention.

[0042] Figure 3 is a schematic top view of a diesel filtration module according to an exemplary embodiment of the present invention.

[0043] Figure 4 is along Figure 3 a schematic cross-sectional view of the diesel filtration module taken along line A-A.

[0044] Figure 5 is along Figure 3 a schematic cross-sectional view of a state of the diesel filtration module taken along line B-B, showing that the outlet switch valve is in the open position, so the oil outlet is open.

[0045] Figure 6 is along Figure 3 a schematic cross-sectional view of another state of the diesel filtration module taken along line B-B, showing that the outlet switch valve is in the closed position, so the oil outlet is closed.

[0046] Figure 7 is along Figure 3 a schematic cross-sectional view of the diesel filtration module taken along line C-C.

[0047] Figure 8 is along Figure 3 a schematic cross-sectional view of the diesel filtration module taken along line D-D.

[0048] Figure 9 is along Figure 3 a schematic cross-sectional view of the diesel filtration module taken along line E-E.

[0049] Figure 10 is along Figure 3 a schematic cross-sectional view of the diesel filtration module taken along line F-F.

[0050] Figure 11 is a hydraulic system diagram showing a diesel filtration module in a normal operating mode according to an exemplary embodiment of the present invention.

[0051] Figure 12 It is a hydraulic system diagram of a diesel filter module in the drainage mode, showing an exemplary embodiment according to the present invention.

[0052] Figure 13 It is a hydraulic system diagram of a diesel filter module in the normal oil filling and exhaust mode, showing an exemplary embodiment according to the present invention.

[0053] Among them, the reference numerals are as follows:

[0054] 1. Diesel fuel tank

[0055] 2. Heater

[0056] 3. Inlet check valve

[0057] 4. Electronic pump filter

[0058] 5. Electronic pump

[0059] 6. Filter

[0060] 61. Oil outlet hole

[0061] 7. Outlet switch valve

[0062] 71. First valve body part

[0063] 72. Second valve body part

[0064] 73. Intermediate valve stem

[0065] 74. Spring

[0066] 8. Water storage area inside the housing

[0067] 9. Drain check valve

[0068] 10. Manual drain valve

[0069] 11. External water storage area

[0070] 12. Gear pump

[0071] 13. Fine filter element

[0072] 14. High-pressure common rail system 15. Inlet port 16. Outlet port 17. Drainage pipeline 171. Outlet 18. Water level sensor 181. Installation body 19. Body part 191. Dirty side of the filter 20. Head part 201. Electronic pump installation part 202. First oil inlet passage 203. Second oil inlet passage P1. First pressure P2. Second pressure Detailed implementation manners

[0073] Next, the technical solutions in the embodiments of the present application will be described in detail with reference to the accompanying drawings in the embodiments of the present application.

[0074] First, referring to Figure 1 and Figure 2 , a schematic perspective view of an assembled diesel filtration module and a schematic exploded perspective view of an exemplary embodiment of the present invention are respectively shown.

[0075] The diesel filtration module mainly includes a housing, a filter 6, a drainage device, and an electronic pump 5. The housing may include a body portion 19 and a head portion 20 connected to each other. The housing has an oil inlet 15 for inputting diesel to be filtered ( Figure 3 shown therein) and an oil outlet 16 for outputting the filtered diesel. An outlet switch valve 7 is provided at the oil outlet 16. It can be understood that the oil outlet 16 may be a section of an oil outlet pipeline, and the outlet switch valve 7 may be arranged at the beginning of this section of the oil outlet pipeline.

[0076] The filter 6 is accommodated in the housing, particularly in the space within the body portion 19, and is used to filter the diesel to be filtered to separate water from the diesel to be filtered, so that the separated water accumulates in the housing. The filter 6 may be, for example, a coarse filter element. The drainage device has a drainage pipeline 17 for discharging the water accumulated in the housing. The electronic pump 5 is installed on the head portion 20 of the housing, and the electronic pump 5 is used to inject the diesel to be filtered from the oil inlet 15 into the housing. A hollow columnar electronic pump mounting portion 201 is arranged in the head portion 20 for mounting the electronic pump 5, and the central axis of the electronic pump mounting portion 201 and the central axis of the body portion 19 of the housing may be perpendicular to each other. The outlet switch valve 7, the mounting body 181 of the water level sensor 18 (refer to Figure 9 ) and the electronic pump 5 are all installed in the head portion 20.

[0077] Referring to Figure 7 , two oil inlet passages communicating with the oil inlet are formed in the head portion 20. The first oil inlet passage 202 leads to the electronic pump 5, and the second oil inlet passage 203 leads to the area around the filter 6 for receiving the diesel to be filtered and enters the dirty side of the filter.

[0078] The diesel filtration module of the present invention has three modes, namely a drainage mode, a filling and exhausting mode, and a normal working mode. These three modes will be described in detail below. In particular, when it is necessary to discharge the water accumulated in the housing, the drainage mode is started, the electronic pump 5 operates at a first power, and the oil outlet 16 is closed by the outlet switch valve 7 to increase the pressure in the housing, so that the water in the housing is automatically discharged through the drainage pipeline 17.

[0079] Referring to Figure 4 and Figure 5, the filter 6 has a hollow cylindrical shape surrounded by filter material. The filter 6 is inserted into the hollow space of the main body portion 19 of the housing. A dirty side 191 of the filter for receiving the diesel to be filtered is formed between the inner circumference of the housing and the outer circumference of the filter 6. Filtered diesel is obtained in the internal space of the filter 6, and a clean side of the filter is defined in the internal space of the filter 6. An oil outlet hole 61 for discharging the filtered diesel is formed at the upper end of the hollow cylindrical shape of the filter. The oil outlet hole 61 is in fluid communication with the oil outlet 16 of the housing.

[0080] The negative pressure side of the electronic pump 5 is connected to the oil inlet 15 of the housing, and the positive pressure side of the electronic pump 5 is connected to the dirty side of the filter inside the housing. And an outlet switch valve 7 is arranged in the valve installation area of the housing that connects the oil outlet hole 61 and the oil outlet 16.

[0081] Refer to Figure 4 , the valve installation area is arranged along the vertical direction, above the oil outlet hole 61 of the filter 6 and below the electronic pump 5. The position of the valve installation area close to the electronic pump 5 has a communication path leading to the negative pressure side of the electronic pump 5. Among them, the outlet switch valve 7 is arranged in the valve installation area along the vertical direction. The two ends of the outlet switch valve 7 are respectively connected to the negative pressure side of the electronic pump 5 and the clean side of the filter.

[0082] Refer to Figure 2 、 Figure 5 and Figure 6 , the specific structure and working mode of the outlet switch valve 7 are specifically described. The outlet switch valve 7 is a spring-loaded mechanical valve. One end of the mechanical valve is connected to the negative pressure side of the electronic pump 5, and the other end of the mechanical valve is connected to the positive pressure side of the electronic pump 5, so that when the electronic pump 5 operates at the first power, the pressure difference between one end and the other end of the mechanical valve increases to be sufficient to overcome the spring force of the mechanical valve, thereby closing the oil outlet 16.

[0083] For example, refer to Figure 6 , the outlet switch valve 7 includes a movable valve body and a spring 74 arranged on the valve body. The valve body has a first valve body portion 71 for blocking the oil outlet 16 when closed, a second valve body portion 72 for supporting the spring 74, and an intermediate valve stem 73 located between the first valve body portion 71 and the second valve body portion 72. Among them, the outer circumferences of the first valve body portion 71, the second valve body portion 72, and the intermediate valve stem 73 are all cylindrical, and the maximum diameter of the intermediate valve stem 73 is smaller than the maximum diameter of the first valve body portion 71 and smaller than the maximum diameter of the second valve body portion 72.

[0084] One end of the spring 74 abuts against the surface of the valve installation area of the housing, and the other end of the spring 74 abuts against the bearing surface in the recessed installation groove of the second valve body part 72. The bearing surface is connected to the negative pressure side of the electronic pump 5, bears the first pressure P1, and the surface of the second valve body part 72 facing away from the spring is connected to the positive pressure side of the electronic pump 5 and bears the second pressure P2.

[0085] It should be noted that when the electronic pump is closed (which can correspond to the normal working mode of the diesel filtration module) or operates at a power lower than the first power (which can correspond to the oil filling and exhaust mode of the diesel filtration module), the pressure difference between the first pressure P1 and the second pressure P2 cannot overcome the spring force of the spring 74, and the position of the first valve body part 71 allows the oil outlet hole 61 of the filter to be in fluid communication with the oil outlet 16 of the housing. Reference can be made to Figure 4 and Figure 5 . At the same time, referring to Figure 2 it can be seen that the first valve body part 71 includes a hollow cylindrical body and a plurality of connecting plates located inside the cylindrical body. The plurality of connecting plates are connected to the part of the intermediate valve stem 73 extending into the first valve body part 71. Therefore, the first valve body part 71 allows the oil outlet hole 61 of the filter 6 to be in fluid communication with the oil outlet 16 of the housing.

[0086] When the electronic pump operates at the first power (which can correspond to the drainage mode of the diesel filtration module), the pressure difference between the first pressure P1 and the second pressure P2 overcomes the spring force of the spring 74, causing the first valve body part 71 to move to a position where it closes the oil outlet 16 of the housing. Obviously, the first valve body part 71 uses the peripheral wall of the hollow cylindrical body to close the passage where the oil outlet 16 of the housing is located.

[0087] Referring to Figure 9 , the diesel filtration module may include a water level sensor 18. The water level sensor 18 includes a mounting body 181 and a sensing element connected to each other. The sensing element of the water level sensor 18 is disposed in the drainage pipe 17 for measuring the water level accumulated in the drainage pipe 17. The sensing element of the water level sensor 18 includes two electrodes, and the two electrodes are arranged at a predetermined position in the drainage pipe that requires an alarm to detect whether the place where the two electrodes are immersed is water or diesel based on the different resistances of diesel and water. If water is detected, an alarm is given and the electronic pump 5 is started to operate at the first power.

[0088] Referring to Figure 2 and Figures 11 to 13, the diesel filtration module may further include an inlet check valve 3 arranged in parallel with the electric pump. The inlet check valve 3 is configured such that when the oil filtration module is in the normal operating mode, the diesel to be filtered bypasses the electric pump 5 from the inlet port 15 and enters the housing. When the electric pump 5 is operating, the inlet check valve 3 prevents the diesel to be filtered from flowing back. The diesel filtration module may further include a heater 2 at an upstream position of the inlet check valve 3, and the heater 2 may also be integrated in the head portion 20 of the housing.

[0089] Referring to Figure 8 , the drain pipe 17 extends vertically from the bottom of the housing to the upper region of the housing within the housing, and a drain check valve 9 is provided at the drain outlet of the drain pipe 17 (referring to Figures 11 to 13 ). The drain check valve 9 may have a spring-loaded valve body, and when the electric pump 5 operates at the first power, the water in the housing can automatically drain out overcoming the resistance of the drain check valve 9.

[0090] Referring to Figure 2 , a manual drain port may be provided at the bottom of the housing, and a manual drain valve 10 is provided at the manual drain port. The diesel filtration module may further include an electric pump filter screen 4 located upstream of the electric pump 5.

[0091] Referring to Figure 11 , a hydraulic system diagram of the diesel filtration module in the normal operating mode according to an exemplary embodiment of the present invention is shown. In the normal operating mode, the electric pump 5 stops working, and the gear pump 12 located downstream of the diesel filtration module serves as the power source. The outlet port 16 of the diesel filtration module is in a negative pressure, and the diesel to be filtered enters the housing from the inlet port 15, and after being filtered by the filter 6, it is discharged from the outlet port 16.

[0092] Specifically, in the normal operating mode, the diesel running route is successively the diesel fuel tank 1, the heater 2, the inlet check valve 3, the filter 6, the outlet switch valve 7, the gear pump 12, the fine filtration element 13, the high-pressure common rail system 14 (10%) / the diesel fuel tank 1 (90%). The pressure difference between the first pressure P1 and the second pressure P2 at both ends of the outlet switch valve 7 cannot overcome the spring force, which makes the channel where the outlet port 16 is located open.

[0093] Referring to Figure 12 , a hydraulic system diagram of the diesel filtration module in the drainage mode according to an exemplary embodiment of the present invention is shown. When it is necessary to drain the water accumulated in the housing, the drainage mode is started, the electric pump 5 operates at the first power, the outlet port 16 is closed by the outlet switch valve 7, the pressure in the housing increases, so that the water in the housing can overcome the resistance of the drain check valve 9 and automatically drain out through the drain outlet of the drain pipe 17.

[0094] Specifically, during the engine power-on self-check, the water level sensor 18 detects a water level alarm, and the electronic pump 5 operates at a high power of the first power (for example, for 3 seconds continuously) to drain water. The electronic pump 5 serves as a power source, and the diesel fuel flow path is successively the diesel fuel tank 1, the heater 2, the electronic pump filter screen 4, the electronic pump 5, the water storage area 8 inside the housing, the drain check valve 9, the external water storage area 11. The pressure difference between the first pressure P1 and the second pressure P2 at both ends of the outlet switch valve 7 overcomes the spring force to close the channel where the oil outlet 16 is located, and the second pressure P2 is greater than the opening pressure of the drain check valve 9 to open the drain check valve 9 and drain water.

[0095] Figure 13 FIG. shows a hydraulic system diagram of a diesel fuel filtration module in a normal oil filling and air exhausting mode according to an exemplary embodiment of the present invention. In the oil filling and air exhausting mode, the electronic pump 5 operates at a second power, and the second power is less than the first power. When the electronic pump 5 operates at the second power, the mechanical valve does not close the oil outlet 16 but keeps the oil outlet 16 open. The electronic pump 5 sucks the diesel fuel to be filtered from the diesel fuel tank 1 into the inlet 15 and discharges the air existing in the diesel fuel filtration module to fill the pipeline on the downstream side of the filter with diesel fuel.

[0096] Specifically, when the engine is powered on, the electronic pump 5 operates (for example, for 5 to 10 seconds continuously), discharges the gas in the pipeline, and fills the fuel system with diesel fuel so that the engine can be started quickly. The electronic pump 5 serves as a power source, and the diesel fuel flow path is successively the diesel fuel tank 1, the heater 2, the electronic pump filter screen 4, the electronic pump 5, the filter 6, the outlet switch valve 7, the gear pump 12, the fine filtration element 13, the diesel fuel tank 1 (100%). The pressure difference between the first pressure P1 and the second pressure P2 at both ends of the outlet switch valve 7 cannot overcome the spring force, which makes the channel where the oil outlet is located open.

[0097] The above are only the preferred embodiments of the present application and are not used to limit the present application. For those skilled in the art, various changes and modifications can be made to the present application. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A diesel filtration module, characterized in that, The diesel filtration module includes: a housing having an inlet port (15) for receiving diesel to be filtered and an outlet port (16) for discharging the filtered diesel, and an outlet shut-off valve (7) is provided at the outlet port (16); a filter (6) accommodated in the housing for filtering the diesel to be filtered to separate water from the diesel to be filtered, such that the separated water accumulates in the housing; a drainage device having a drainage pipeline (17) for discharging the water accumulated in the housing; and an electric pump (5) installed in the housing, the electric pump (5) being configured to inject the diesel to be filtered into the housing from the inlet port (15), wherein the diesel filtration module has a drainage mode, when it is necessary to discharge the water accumulated in the housing, the drainage mode is started, the electric pump (5) operates at a first power, and the outlet shut-off valve (7) is configured to close the outlet port (16), so that the water in the housing is automatically discharged via the drainage pipeline (17).

2. The diesel fuel filtration module according to claim 1, wherein The outlet shut-off valve (7) is a spring-loaded mechanical valve, one end of the mechanical valve is connected to the negative pressure side of the electric pump (5), and the other end of the mechanical valve is connected to the positive pressure side of the electric pump (5), such that when the electric pump (5) operates at the first power, the pressure difference between one end and the other end of the mechanical valve increases to be sufficient to overcome the spring force of the mechanical valve, thereby closing the outlet port (16) by the mechanical valve.

3. The diesel filtration module according to claim 2, wherein the filter (6) includes a hollow cylindrical shape surrounded by a filtering material, the filter (6) is inserted into the hollow space of the housing, a dirty side of the filter for receiving the diesel to be filtered is defined between the inner circumference of the housing and the outer circumference of the filter (6), and a clean side of the filter is defined in the inner space of the filter (6); wherein an outlet hole (61) for allowing the filtered diesel to flow out is formed at the upper end of the hollow cylindrical shape, and the outlet hole (61) is in fluid communication with the outlet port (16) of the housing; wherein the negative pressure side of the electric pump (5) is connected to the inlet port (15) of the housing, and the positive pressure side of the electric pump (5) is connected to the dirty side of the filter in the housing, and the outlet shut-off valve (7) is arranged in a valve installation area in the housing that connects the outlet hole (61) and the outlet port (16).

4. The diesel fuel filtration module according to claim 3, characterized in that, The valve installation area is arranged in the housing along the vertical direction, above the outlet hole (61) of the filter (6) and below the electric pump (5), and a communication path leading to the negative pressure side of the electric pump (5) is provided at a position of the valve installation area close to the electric pump (5), wherein the outlet shut-off valve (7) is arranged in the valve installation area along the vertical direction, the upper end of the outlet shut-off valve (7) is connected to the negative pressure side of the electric pump (5) via the communication path, and the lower end of the outlet shut-off valve (7) is connected to the clean side of the filter.

5. The diesel fuel filtration module according to claim 3 or 4, characterized in that, The diesel filter module has an oil filling and exhaust mode. In the oil filling and exhaust mode, the electronic pump (5) operates at a second power, which is less than the first power. When the electronic pump (5) operates at the second power, the mechanical valve does not close the oil outlet (16), but keeps the oil outlet (16) open. The electronic pump (5) sucks the diesel to be filtered from the oil inlet (15) into the filter to fill the pipeline on the downstream side of the filter with diesel.

6. The diesel fuel filtration module according to claim 3 or 4, characterized in that, The oil filter module further has a normal working mode. In the normal working mode, the electronic pump (5) stops working, and the diesel to be filtered bypasses the electronic pump (5) from the oil inlet (15) and enters the dirty side of the filter in the housing. After being filtered by the filter (6) and passing through the opened outlet switch valve (7), it is discharged from the oil outlet (16).

7. The diesel filter module according to any one of claims 1 to 4, characterized in that The diesel filter module includes a water level sensor (18). The water level sensor (18) includes a mounting body and a sensing element connected to each other. The sensing element of the water level sensor (18) is arranged in the drain pipeline (17) to measure the water level accumulated in the drain pipeline (17).

8. The diesel fuel filtration module according to claim 7, wherein The sensing element of the water level sensor (18) includes two electrodes. The two electrodes are arranged at a predetermined position in the drain pipeline where an alarm is required to detect whether the liquid at the immersion position of the two electrodes is water or diesel based on the different resistances of diesel and water. If water is detected, an alarm is given and the electronic pump (5) is started to operate at the first power.

9. The diesel filter module according to claim 7, wherein The housing includes a body part (19) and a head part (20) connected to each other. Wherein, the filter (6) is accommodated in the space within the body part (19). Wherein, the outlet switch valve (7), the mounting body of the water level sensor (18), and the electronic pump (5) are all installed in the head part (20). And wherein, a first oil inlet passage (202) and a second oil inlet passage (203) communicating with the oil inlet (15) are formed in the head part (20). The first oil inlet passage (202) leads to the electronic pump (5), and the second oil inlet passage (203) leads to the area around the filter (6) for receiving the diesel to be filtered.

10. The diesel fuel filtration module according to claim 6, wherein, The diesel filter module further includes an inlet check valve (3) arranged in parallel with the electronic pump (5). The inlet check valve (3) is configured such that when the oil filter module is in the normal working mode, the diesel to be filtered bypasses the electronic pump (5) and enters the housing. When the electronic pump (5) operates, the inlet check valve (3) prevents the diesel to be filtered from flowing back.

11. The diesel fuel filtration module according to claim 10, wherein, The diesel filter module further includes a heater (2) at the upstream position of the inlet check valve (3).

12. The diesel filter module according to any one of claims 1 to 4, wherein The drain pipe (17) extends vertically from the bottom of the housing to the upper region of the housing within the housing, and a drain check valve (9) is provided at the drain outlet of the drain pipe (17). When the electric pump (5) operates at the first power, the water in the housing can automatically drain via the drain pipe (17) by overcoming the resistance of the drain check valve (9).

13. The diesel filtration module according to any one of claims 1 to 4, characterized in that A manual drain outlet is provided at the bottom of the housing, and a manual drain valve (10) is provided at the manual drain outlet.

14. The diesel filtration module according to any one of claims 1 to 4, characterized in that, The diesel filter module further includes an electric pump strainer (4) located upstream of the electric pump (5).

15. The diesel filtration module according to claim 3 or 4, characterized in that, The outlet shut-off valve (7) includes a movable valve body and a spring (74) provided on the valve body; wherein the valve body has a first valve body portion (71) for closing the oil outlet (16) when closed, a second valve body portion (72) for supporting the spring (74), and an intermediate valve stem (73) located between the first valve body portion (71) and the second valve body portion (72); wherein one end of the spring (74) abuts against the surface of the valve mounting area of the housing, and the other end of the spring (74) abuts against a bearing surface in a recessed mounting groove of the second valve body portion (72); the bearing surface is connected to the negative pressure side of the electric pump (5) and bears a first pressure (P1), and the surface of the second valve body portion (72) facing away from the bearing surface is connected to the positive pressure side of the electric pump (5) and bears a second pressure (P2); wherein when the electric pump (5) is closed or operates at a power lower than the first power, the pressure difference between the first pressure (P1) and the second pressure (P2) cannot overcome the spring force of the spring (74), and the position of the first valve body portion (71) allows the oil outlet hole (61) to be in fluid communication with the oil outlet (16) of the housing; and wherein when the electric pump (5) operates at the first power, the pressure difference between the first pressure (P1) and the second pressure (P2) overcomes the spring force of the spring (74), causing the first valve body portion (71) to move to a position closing the oil outlet (16) of the housing.

Images