Fuel filter, fuel system and vehicle with fuel system

Abstract

The utility model provides a fuel filter, a fuel system and a vehicle, the filter comprises a filter body, one end of the filter body is provided with an oil inlet pipe, the other end of the filter body is provided with an oil outlet pipe, a first filter element, a second filter element and a third filter element are sequentially connected between the oil inlet pipe and the oil outlet pipe, and the first filter element, the second filter element and the third filter element are sequentially connected from the first filter element to the third filter element. The filter holes of the three are sequentially reduced; each filter element is arranged on a bracket of the filter element, and the bracket can rotate or be pulled relative to the body; and a water-oil separation device is further arranged on the oil outlet side of the body. By adopting the structure, impurities with different particle sizes can be sequentially filtered through three-stage filtration. Due to the fact that the bracket can rotate or be pulled relative to the body, when the filter element needs to be replaced, only the bracket with the failed filter element needs to be screwed out or pulled out, then the old filter element on the bracket is taken down and replaced with a new filter element, and then the bracket is reset, the whole process is convenient and fast, and the maintenance efficiency of the filter is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of vehicles, in particular to a fuel filter, a fuel system with the fuel filter, and a vehicle with the fuel system. Background Art

[0002] The fuel system of a vehicle is equipped with a fuel filter. The function of the fuel filter is to prevent particulate matter, water and impurities in the fuel, and to protect the precision parts of the fuel system from wear and other damage. When the fuel filter fails, impurities in the gasoline cannot be completely filtered out, the mixed gas cannot be completely burned, the internal combustion engine will have carbon deposits or knocks; the fuel supply pressure will drop, the working pressure of the gasoline pump will increase, the fuel consumption will increase, and it will be easy to be damaged; the whole vehicle will jitter at idle speed, lack of power and other problems. Therefore, when the fuel filter fails, it needs to be replaced in time.

[0003] In daily car use, fuel filters are maintenance wearing parts that need to be replaced regularly, and the replacement cycle is mostly based on the vehicle mileage set by the OEM based on experience. However, the experience values ​​of each OEM are different, and the fuel quality in different places is also different. This results in no unified replacement standard for fuel filters, and may lead to two problems. First, the fuel filter has reached its life cycle before the vehicle reaches the replacement mileage. In this way, the owner will only replace the fuel filter when the vehicle has obvious faults, but the vehicle's fuel consumption or damage is irreversible; second, when the vehicle reaches the replacement mileage, the fuel filter still has a certain life cycle, and it will be a waste if it is replaced directly.

[0004] In addition, in the prior art, when it is determined that the filter element needs to be replaced, the outer shell of the filter must first be disassembled, the old filter element must be removed from the installation position, the new filter element must be placed in the installation position, and then the outer shell of the filter must be assembled. The entire process of replacing the filter element is relatively cumbersome and inefficient.

[0005] In view of this, it is urgent to propose a new fuel filter to address the above technical problems, so that it is easy to replace the filter element while ensuring efficient filtration and strict sealing, thereby improving the replacement efficiency; in addition, it is also necessary to propose a fuel system that can intelligently detect whether the fuel filter is invalid, so as to avoid vehicle failure due to failure to replace the fuel filter in time. Utility Model Content

[0006] The purpose of the embodiments of the utility model is to provide a fuel filter, a fuel system and a vehicle having the fuel system, which can not only intelligently detect whether the filter is invalid, but also facilitate the replacement of the filter element, thereby avoiding vehicle failure due to failure to replace the filter in time.

[0007] In order to achieve the above-mentioned purpose, an embodiment of the utility model provides a fuel filter, including a filter body, one end of the body is provided with an oil inlet pipe, and the other end is provided with an oil outlet pipe, and a first filter element, a second filter element and a third filter element are connected in sequence from the oil inlet pipe to the oil outlet pipe, and the filter holes of the three filter elements are reduced in sequence from the first filter element to the third filter element; each filter element is arranged on its bracket, and the bracket can be rotated or pulled relative to the body; and the body is also provided with a water-oil separation device on the oil outlet side.

[0008] With this structure, when the oil enters the filter body from the oil inlet pipe, it first passes through the first filter element to filter out impurities with larger particles, then passes through the second filter element to filter out impurities with medium particles, and finally passes through the third filter element to filter out impurities with the smallest particles. In this way, impurities of different particle sizes can be filtered in sequence through three-stage filtration, improving the filtering accuracy and ensuring the filtering effect. In addition, since the bracket can be rotated or pulled relative to the body, when the filter element needs to be replaced, it is only necessary to unscrew or pull out the bracket of the failed filter element, then remove the old filter element on the bracket and replace it with a new filter element, and then reset the bracket. The replacement process does not require the removal and installation of the filter body, nor does it require the removal of other filter elements and their brackets that have not failed, making the entire process convenient and quick, greatly improving the maintenance efficiency of the filter.

[0009] Preferably, the three filter elements are arranged in sequence from top to bottom; the filter includes three coaxially arranged inner cores, the three filter elements are respectively mounted on the outside of the inner cores, and the bracket is cylindrical and mounted on the outside of the filter element; the end plate of the first bracket close to the second filter element is provided with a plurality of first through holes on the edge of the outside of the first filter element, the second bracket is provided with a second through hole connecting the second inner core and the third inner core on the end plate close to the third filter element, the third bracket is provided with a plurality of third through holes on the edge of the oil outlet end plate, and the oil outlet end plate is provided with the oil outlet pipe; the filter also includes a connecting shaft connecting the three brackets, and the bracket is rotatably connected to the connecting shaft through a hinge structure; the water-oil separation device is arranged at the bottom of the body.

[0010] Preferably, the three filter elements are arranged sequentially from the inside to the outside; the body is cylindrical, an inner core is provided in the body, the three brackets are concentrically arranged sleeves with diameters increasing sequentially from the inside to the outside, and the three filter elements are respectively and correspondingly mounted on the outsides of the three brackets; the three brackets are arranged in the body and can be pulled out and pushed in along the axial direction relative to the body; the water-oil separation device is arranged at the bottom of the body.

[0011] Preferably, the extension direction of the first filter hole of the first filter element is at a 45° angle relative to the axial direction of the inner core, the extension direction of the second filter hole of the second filter element is at a 90° angle relative to the first filter hole, and the extension direction of the third filter hole of the third filter element is at a 90° angle relative to the second filter hole.

[0012] Preferably, the water-oil separation device includes a water outlet pipe on the end plate on the oil outlet side of the main body, and an inner extending port of the water outlet pipe and an inner extending port of the oil outlet pipe are provided with a height difference, and the inner extending port of the oil outlet pipe is higher than the inner extending port of the water outlet pipe; and the main body is also provided with at least one retention groove on the end plate on the oil outlet side, and the groove opening of the retention groove is lower than the inner extending port of the water outlet pipe.

[0013] The utility model also provides a fuel system for a vehicle, comprising: a fuel tank, wherein an oil pump is arranged in the fuel tank; an intake manifold, wherein the oil pump is connected to the engine via an oil rail; a first filter, which is arranged between the oil pump and the oil rail, and wherein the first filter adopts the above structure; the pressure regulating valve, wherein the inlet of the pressure regulating valve is connected to the outlet of the filter, and the outlet of the pressure regulating valve is connected to the fuel tank; the fuel system also comprises a monitoring device for monitoring whether the fuel filter is clogged, and the monitoring device is connected to the first filter.

[0014] With this structure, when the filter does not reach the clogging threshold and works normally, the oil pump pumps the oil out of the oil tank at the initial first pressure, and the oil passes through the first filter. Since the first filter may have some clogging, the pressure of the oil drops to the second pressure after passing through the first filter, and then flows to the engine through the oil rail. Since the second pressure is still higher than the required pressure value of the engine, the pressure regulating valve will be opened under the drive of the second pressure, and the oil will flow back to the oil tank through the pressure regulating valve to eliminate the difference between the second pressure and the oil inlet pressure value, and maintain the oil inlet pressure value of the intake manifold. At this time, the monitoring valve is not opened, and it can be maintained.

[0015] When the filter is severely clogged and reaches the clogging threshold, the oil pump pumps oil out of the fuel tank, and the oil passes through the first filter. Due to the large pressure drop caused by the severe blockage of the first filter, the first pressure of the oil pumped out by the oil pump needs to be greater than the sum of the engine's required pressure and the pressure drop of the first filter to meet the engine's preset required oil pressure. The opening pressure of the monitoring valve is less than the sum of the oil pressures. Therefore, when the oil pumped out by the oil pump, the monitoring valve will open to relieve pressure. At this time, an alarm will be triggered, indicating that the filter is severely clogged and needs to be replaced.

[0016] Preferably, the monitoring device is a monitoring valve, the oil inlet of the monitoring valve is arranged between the oil inlets of the fuel tank and the filter, and the oil outlet of the monitoring valve is connected to the fuel tank; the preset opening pressure of the monitoring valve is greater than the engine demand pressure and less than the sum of the engine demand pressure and the pressure drop threshold of the first filter.

[0017] Preferably, the monitoring device includes a monitoring valve, a second filter and a pressure sensor, the oil inlet of the monitoring valve is arranged between the oil tank and the oil inlet of the filter, the oil outlet of the monitoring valve is connected to the second filter, and the oil outlet pipe of the second filter is connected to the oil rail through the pressure sensor; the preset opening pressure of the monitoring valve is greater than the engine demand pressure and less than the sum of the engine demand pressure and the pressure drop threshold of the first filter.

[0018] Preferably, the preset opening pressure of the monitoring valve is 95% to 99% of the sum of the engine demand pressure and the pressure drop threshold of the first filter.

[0019] The utility model also provides a vehicle, comprising an engine and the fuel system as described above, wherein an oil circuit of the fuel system is connected to an oil circuit of the engine.

[0020] Since the above-mentioned fuel system has the above-mentioned technical effects, the vehicle including the filter also has the same or corresponding technical effects, which will not be described in detail here. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] The accompanying drawings are used to provide a further understanding of the embodiments of the present utility model and constitute a part of the specification. Together with the following specific implementations, they are used to explain the embodiments of the present utility model, but do not constitute a limitation on the embodiments of the present utility model. In the accompanying drawings:

[0022] Figure 1 It is a structural schematic diagram of a specific implementation of the fuel filter provided by the utility model;

[0023] Figure 2 for Figure 1 Cross-sectional view in

[0024] Figure 3 for Figure 1 A schematic diagram of the structure after the bracket in FIG. is rotated out;

[0025] Figure 4 A structural schematic diagram of another specific implementation of the fuel filter provided by the utility model;

[0026] Figure 5 for Figure 4 Cross-sectional view in

[0027] Figure 6for Figure 4 A schematic diagram of the structure after the bracket is pushed out;

[0028] Figure 7 for Figure 5 An enlarged view of the filter element in FIG.

[0029] Figure 8 A structural schematic diagram of a specific implementation of the fuel system provided by the utility model;

[0030] Fig. 9 This is a structural schematic diagram of another specific implementation of the fuel system provided by the utility model.

[0031] Description of Reference Numerals

[0032] 1- fuel filter; 11- body; 111- oil inlet pipe; 112- oil outlet pipe; 1121- inner extension port of oil outlet pipe; 113- connecting shaft;

[0033] 12-first filter element; 121-first filter hole; 13-second filter element; 131-second filter hole; 14-third filter element; 141-third filter hole;

[0034] 15-first bracket; 151-first through hole; 16-second bracket; 161-second through hole; 17-third bracket; 171-third through hole;

[0035] 18-water-oil separation device; 181-water outlet pipe; 1811-inner extension port of the water outlet pipe; 182-retention tank;

[0036] 19-inner core; 191-first inner core; 192-second inner core; 193-third inner core;

[0037] 110- sealing ring;

[0038] 2-Fuel tank; 3-Intake manifold; 4-Fuel rail; 5-Engine; 6-Pressure regulating valve; 7-Monitoring device; 71-Monitoring valve; 72-Second filter; 73-Pressure sensor; 8-ECU; 9-EKPSU. DETAILED DESCRIPTION

[0039] The specific implementation of the embodiment of the utility model is described in detail below in conjunction with the accompanying drawings. It should be understood that the specific implementation described here is only used to illustrate and explain the embodiment of the utility model, and is not used to limit the embodiment of the utility model.

[0040] Figure 1 It is a structural schematic diagram of a specific implementation of the fuel filter provided by the utility model; Figure 2 for Figure 1 Cross-sectional view in Figure 3 for Figure 1 Schematic diagram of the structure after the bracket is rotated out.

[0041] like Figure 1-3 As shown, the utility model provides a fuel filter, including a filter body 11, one end of the body 11 is provided with an oil inlet pipe 111, and the other end is provided with an oil outlet pipe 112. From the oil inlet pipe 111 to the oil outlet pipe 112, a first filter element 12, a second filter element 13 and a third filter element 14 are connected in sequence, and the filter holes of the three filter elements decrease in sequence from the first filter element 12 to the third filter element 14; each filter element is arranged on its bracket, and the bracket can be rotated or pulled relative to the body 11; and the body 11 is also provided with a water-oil separation device 18 on the oil outlet side.

[0042] With this structure, when the oil enters the filter body 11 from the oil inlet pipe 111, it first passes through the first filter element 12 to filter out impurities with larger particles, then passes through the second filter element 13 to filter out impurities with medium particles, and finally passes through the third filter element 14 to filter out impurities with the smallest particles. In this way, impurities of different particle sizes can be filtered out in turn through three-stage filtration, thereby improving the filtration accuracy and ensuring the filtration effect.

[0043] In addition, since the bracket can be rotated or pulled relative to the main body 11, when the filter element needs to be replaced, it is only necessary to unscrew or pull out the bracket of the failed filter element, then remove the old filter element on the bracket, replace it with a new filter element, and then reset the bracket. The replacement process does not require disassembly and installation of the filter body 11, nor does it require disassembly of other non-failed filter elements and their brackets, making the entire process convenient and quick, greatly improving the maintenance efficiency of the filter.

[0044] In one specific embodiment, Figure 2As shown, the three filter elements of the above-mentioned filter are arranged in sequence from top to bottom; the filter includes three coaxially arranged inner cores 19, which include a first inner core 191, a second inner core 192, and a third inner core 193 from top to bottom, and the three filter elements are respectively mounted on the outside of the three inner cores, and the bracket is a cylindrical bracket mounted on the outside of the filter element; the end plate of the first bracket 15 close to the second filter element 13 is provided with a plurality of first through holes 151 on the edge of the outer side of the first filter element 12, the second bracket 16 is provided with a second through hole 161 connecting the second inner core 192 and the third inner core 193 on the end plate close to the third filter element 14, the third bracket 17 is provided with a plurality of third through holes 171 on the edge of the oil outlet end plate, and the oil outlet end plate is provided with the oil outlet pipe 112; the filter also includes a connecting shaft 113 connecting the three brackets, and at least one bracket is rotatably connected to the connecting shaft 113 through a hinge structure. Specifically, the hinge structure can be a C-shaped clamp, one side of the C-shaped clamp is clamped outside the connecting shaft 113, and the other side is connected to the bracket. The C-shaped clamp can rotate horizontally around the connecting shaft 113, thereby driving the bracket to rotate out or in relative to the body 11. It can be imagined that the hinge structure can also adopt other structures such as hinges. In addition, the water-oil separation device 18 is arranged at the bottom of the body 11.

[0045] Using this approach, Figure 2 As shown in the oil flow direction, the oil enters the first inner core 191 from the oil inlet, then passes through the first filter element 12 from the inside to the outside horizontally, filters out the impurities with the largest particles, flows to the edge of the first bracket 15, and then flows vertically downward to the second bracket 16 through the first through hole 151 around the edge, and then flows horizontally from the outside to the inside through the second filter element 13 to filter out the impurities with medium particles, then flows to the second inner core 192, and then vertically passes through the second through hole 161 from top to bottom to the third inner core 193, and then passes through the third filter element 14 from the inside to the outside horizontally, filters out the impurities with smaller particles, and then flows to the edge of the first bracket 15, and then flows through the third through hole 171 around the edge to the bottom of the body 11, and then passes through the water-oil separation device 18, and finally the oil flows out of the filter through the oil outlet pipe 112. At this point, the three-stage filtration is completed.

[0046] Most importantly, if Figure 3 As shown, when a filter element needs to be replaced, it is only necessary to unscrew the bracket of the filter element around the connecting shaft 113 so that the bracket forms a certain angle with other brackets, and then take out the failed filter element in the bracket, put in a new filter element, and then screw the bracket in, so that the filter element can be replaced simply and conveniently. There is no need to disassemble and install other parts of the filter, which improves work efficiency. Of course, in order to solve the sealing problem of this structure, a sealing ring can be set between adjacent brackets to avoid oil leakage. Since the sealing technology is a conventional technology in the prior art and is not the innovation point of this application, it will not be repeated here.

[0047] like Figure 4-6 As shown, Figure 4 A structural schematic diagram of another specific implementation of the fuel filter provided by the utility model; Figure 5 for Figure 4 Cross-sectional view in Figure 6 for Figure 4 Schematic diagram of the structure after the bracket is pushed out.

[0048] In another specific embodiment, Figure 4 and Figure 5 As shown, the three filter elements are arranged in sequence from the outside to the inside; the main body 11 is cylindrical, an inner core 19 is provided in the main body 11, the three brackets are concentrically arranged, and the diameters of the sleeves increase from the inside to the outside, and the three filter elements are respectively mounted on the outsides of the three brackets; the three brackets are arranged in the main body 11 and can be pulled out and pushed in along the axial direction relative to the main body 11.

[0049] Using this structure, Figure 5 As shown in the oil flow direction, the oil enters the inner core 19 vertically from the oil inlet, and then passes through the first filter element 12, the second filter element 13 and the third filter element 14 horizontally from the inside to the outside for three-layer filtration, filtering out impurities with larger particles, medium particles and smaller particles in turn, and then flows vertically downward through the body through holes around the bottom edge of the body 11, and then passes through the water-oil separation device 18, and finally the oil flows out of the filter through the oil outlet pipe 112. At this point, the three-stage filtration is completed. Here, "inside" refers to the position close to the center line of the body sleeve, and "outside" refers to the position away from the center line of the body sleeve.

[0050] More importantly, when the filter needs to be replaced, Figure 6 As shown, the filter element can be replaced simply and conveniently by pulling the filter element bracket sleeve upward relative to the body 11, then removing the failed filter element sleeved on the sleeve, then putting on a new filter element, and then pushing the sleeve in. There is no need to disassemble and install other parts of the filter, ensuring high work efficiency. In order to solve the sealing problem of this structure, a sealing ring can be set between adjacent brackets, for example Figure 5 As shown, sealing rings 110 can be provided between the first bracket 15 and the second bracket 16, between the second bracket 16 and the third bracket 17, and between the third bracket 17 and the body 11 to prevent oil leakage. Since the sealing technology is a conventional technology in the prior art and is not the innovation point of the present application, it will not be described here.

[0051] In addition, the above-mentioned first filter element 12 to the third filter element 14 are not limited to the order from inside to outside, for example, they can also be arranged in the order from outside to inside. Any implementation method in which three-stage filter elements are arranged and the filter holes of the filter elements decrease successively is within the protection scope of the present utility model.

[0052] In a further solution, Figure 7 As shown in the figure, Figure 5 Enlarged view of the filter holes of the middle three-layer filter element. The extension direction of the first filter hole 121 of the first filter element is 45° relative to the axial direction of the inner core 19, the extension direction of the second filter hole 131 of the second filter element is 90° relative to the first filter hole 121, and the extension direction of the third filter hole 141 of the third filter element is 90° relative to the second filter hole 131.

[0053] With this microstructure, as shown in the figure, the oil flow direction can make the oil pass through the first filter element 12 in the upward direction of 45°, and then pass through the second filter element 13, the oil is forced to rotate 90° and enter the second filter hole 131 for filtration. Similarly, when passing through the third filter element 14, the oil is forced to rotate 90° again and then enter the third filter hole 141 for filtration. In this way, the oil can be fully mixed and contacted with the filter element, and the filter element can intercept and filter impurities to the greatest extent, further enhancing the filtering effect. Of course, the extension direction of the above three layers of filter holes can also be positioned in other directions.

[0054] Regarding the specific structure of the water-oil separation device, in another specific embodiment, as Figure 5 As shown, the end plate of the main body 11 on the oil outlet side is further provided with a water outlet pipe 181, and the inner extending port 1181 of the water outlet pipe and the inner extending port 1121 of the oil outlet pipe are provided with a height difference, and the inner extending port 1121 of the oil outlet pipe is higher than the inner extending port 1811 of the water outlet pipe; and the main body 11 is further provided with at least one retention groove 182 on the oil outlet side end plate, and the groove of the retention groove 182 is lower than the inner extending port 1811 of the water outlet pipe 181.

[0055] With this structure, after the oil passes through the three-stage filter element and is left standing, under the action of gravity, the upper layer of the oil is oil and the lower layer is water. The small amount of impurities still remaining in the oil fall into the bottom retention tank 182, and the upper layer of oil flows out through the oil outlet pipe 112 with a higher internal extension height, and the lower layer of water flows out through the water outlet pipe 181 with a lower internal extension height, thus achieving water-oil separation. The residual impurities in the retention tank 182 will not flow out through the water outlet pipe 181. It can be seen that this water-oil separation device 18 not only achieves water-oil separation through a very simple structure, but also achieves further static separation of impurities, and the cost is very low.

[0056] In another specific embodiment, the utility model provides a fuel system for a vehicle, comprising: a fuel tank 2, in which a fuel pump is arranged; an intake manifold 3, in which the fuel pump is connected to an engine 5 via a fuel rail 4; a first filter 1, arranged between the fuel pump and the fuel rail 4, and the first filter 1 can adopt the structure shown in the above multiple specific embodiments; a pressure regulating valve 6, inlet of the pressure regulating valve 6 is connected to the outlet of the filter, and the outlet of the pressure regulating valve 6 is connected to the fuel tank 2; the fuel system also includes a monitoring device 7 for monitoring whether the fuel filter is blocked, and the monitoring device 7 is connected to the first filter 1. In addition, the fuel system also includes an ECU and 8 and an EKPSU9, and the ECU (engine control unit) calculates the amount of fuel required at each time point according to the driver's expectations and the operating state of the engine. The fuel demand is sent as information to the EKPS (electric fuel pump control unit), and the fuel pump responds to the signal of the EKPS in time to adjust its own speed to meet the fuel demand of the engine. The characteristic curve of the fuel demand stored in the ECU and the signal received by the EKPS are calibrated under the premise that the fuel filter is effective. After being pumped out by the oil pump, the fuel is filtered by the first filter 1 to ensure that the engine is provided with the clean fuel it needs.

[0057] like Figure 8 As shown, Figure 8 A schematic diagram of the structure of a specific implementation of the fuel system provided by the utility model. In this specific solution, the monitoring device 7 can be a monitoring valve 71, the oil inlet of the monitoring valve 71 is arranged between the oil inlet of the fuel tank 2 and the filter, and the oil outlet of the monitoring valve 71 is connected to the fuel tank 2; the preset opening pressure of the monitoring valve 71 is greater than the engine demand pressure, and less than but close to the sum of the engine demand pressure and the pressure drop threshold of the first filter 1. Here, the pressure drop threshold of the first filter 1 refers to the maximum value of the oil pressure drop when the first filter 1 flows from its oil inlet to its oil outlet when the first filter 1 is severely blocked and reaches a failure state, that is, the difference between the oil inlet pressure and the oil outlet pressure of the first filter when the first filter fails. In addition, the preset inlet pressure of the pressure regulating valve 6 can be set equal to the required pressure value of the engine.

[0058] With this structure, when the filter does not reach the clogging threshold and works normally, the oil pump pumps the oil out of the oil tank 2 at the initial first pressure, and the oil passes through the first filter 1. Since the first filter 1 may have some clogging, the pressure of the oil drops to the second pressure after passing through the first filter 1, and then flows to the engine 5 through the oil rail 4. Since the second pressure is still higher than the required pressure value of the engine, the pressure regulating valve 6 will be opened under the drive of the second pressure, and the oil will flow back to the oil tank 2 through the pressure regulating valve 6 to eliminate the difference between the second pressure and the oil inlet pressure value and maintain the engine oil inlet pressure value. At this time, the monitoring valve 71 is not opened and no alarm will be given.

[0059] When the filter is seriously clogged and reaches the clogging threshold, the oil pump pumps oil out of the fuel tank 2, and the oil passes through the first filter 1. Since the pressure drop caused by the serious clogging of the first filter 1 is large, the first pressure of the oil pumped out by the oil pump needs to be greater than the sum of the engine demand pressure and the pressure drop of the first filter 1 to meet the engine demand pressure, and the opening pressure of the monitoring valve 71 is less than the sum of the oil pressures. Therefore, when the oil pumped out by the oil pump, the monitoring valve 71 will open to release the pressure, and an alarm will be triggered at this time, indicating that the filter is seriously clogged and needs to be replaced.

[0060] The following examples are given to provide specific explanations.

[0061] When the filter is working normally, assuming that the initial pressure drop of the filter is 5Kpa, the opening pressure of the pressure regulating valve 6 is 400kPa, the first pressure of the oil pumped out by the oil pump is 405KPa, and after filtering by the first filter, the pressure in the pipeline drops to 400KPa, meeting the pressure requirement of the engine 5 of 400Kpa. When the pressure of the oil pumped out by the oil pump is greater than 405Kpa, the pressure regulating valve 6 opens, and the excess fuel flows back to the fuel tank 2 through the pressure regulating valve 6 to release the pressure, thereby keeping the pressure in the pipeline constant at 400Kpa. The opening pressure of the monitoring valve 71 is set to 425Kpa. At this time, the monitoring valve 71 is not opened, and it can be maintained.

[0062] When the filter is seriously clogged and reaches failure, assuming that the filter failure pressure drop threshold is 30Kpa, the first pressure of the oil pumped out by the oil pump is greater than or equal to 430Kpa to ensure that the pressure in the pipeline after filtering by the first filter is 400Kpa required by the engine 5. The opening pressure of the monitoring valve 71 is set to 425Kpa. When the first pressure of the oil pumped out by the oil pump reaches the set pressure of 425Kpa, the monitoring valve 71 opens to release the pressure, resulting in the pressure in the pipeline after filtering by the first filter being less than 400Kpa required by the engine 5, thereby triggering an alarm.

[0063] In another specific embodiment, Fig. 9 As shown, Fig. 9 This is a structural schematic diagram of another specific implementation of the fuel system provided by the utility model.

[0064] The monitoring device 7 may further include a second filter 72, a monitoring valve 71 and a pressure sensor 73. The oil inlet of the monitoring valve 71 is disposed between the oil tank 2 and the oil inlet of the first filter 1. The oil outlet of the monitoring valve 71 is connected to the second filter 72. The oil outlet pipe 112 of the second filter 72 is connected to the oil rail 4 via the pressure sensor 73.

[0065] With this structure, when the first filter 1 works normally, the oil pumped out by the oil pump enters the engine 5 after being filtered by the first filter 1, and the excess fuel flows back to the fuel tank 2 through the pressure regulating valve 6 for pressure relief. At this time, the monitoring valve 71 is not opened and no alarm will be given.

[0066] When the filter is seriously clogged and fails, when the oil pressure pumped out by the oil pump is greater than the sum of the engine demand pressure and the pressure drop of the filter, the monitoring valve 71 opens, and the oil is filtered by the second filter 72 and then enters the engine 5 through the oil rail 4. At this time, the pressure sensor 73 detects that the oil pipe of the second filter 72 generates pressure, which triggers an alarm.

[0067] It can be seen that the use of this structure of two filters in parallel and redundantly arranged can not only alarm after the first filter reaches the end of its life, but also immediately activate the second filter 72 for filtering to ensure the normal operation of the engine 5 system.

[0068] In a more specific solution, the preset opening pressure of the pressure regulating valve 6 can be set to 95% to 99% of the sum of the engine demand pressure and the pressure drop pressure threshold of the first filter. For example, the engine demand pressure is 400Kpa, the filter pressure drop pressure threshold is 30Kpa, and the sum of the two is 430Kpa. At this time, the preset opening pressure of the monitoring valve 71 can be set to 425Kpa. In this way, the filter blockage degree can be monitored in time, the filter life cycle can be accurately determined, and waste caused by premature replacement can be avoided, and obvious vehicle failure caused by too late replacement can be avoided.

[0069] The utility model also provides a vehicle, including an engine 5, and also including the above fuel system, the oil circuit of the fuel system is connected to the oil circuit of the engine 5. Since the above fuel system has the above technical effects, the vehicle including the filter also has the same or corresponding technical effects, which will not be repeated here.

[0070] In the embodiments of the present utility model, unless otherwise specified, directional words such as "up, down, left, right" generally refer to the directions or positional relationships shown in the accompanying drawings, or the directions or positional relationships in which the utility model product is usually placed when in use.

[0071] The terms "first", "second", "third", etc. are only used to distinguish descriptions and cannot be understood as indicating or implying relative importance. The terms "parallel", "vertical", etc. do not mean that the components are required to be absolutely parallel or vertical, but can be slightly tilted. For example, "parallel" only means that its direction is more parallel than "vertical", and does not mean that the structure must be completely parallel, but can be slightly tilted. The terms "horizontal", "vertical", "overhanging", etc. do not mean that the components are required to be absolutely horizontal, vertical or overhanging, but can be slightly tilted. For example, "horizontal" only means that its direction is more horizontal than "vertical", and does not mean that the structure must be completely horizontal, but can be slightly tilted. In addition, the terms "approximately" and "basically" are intended to explain that the relevant content does not require absolute accuracy, but can have a certain deviation. For example, "approximately equal" does not only mean absolute equality. Since it is difficult to achieve absolute "equality" in actual production and operation, there is generally a certain deviation. Therefore, in addition to absolute equality, "approximately equal" also includes the above-mentioned situation with a certain deviation. Taking this as an example, in other cases, unless otherwise specified, the terms "approximately" and "basic" have similar meanings to the above.

[0072] In addition, in the description of the present invention, it is also necessary to explain that, unless otherwise clearly specified and limited, the terms "set", "install", "connect", and "connect" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a direct connection, or an indirect connection through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0073] The optional implementation modes of the utility model are described in detail above in conjunction with the accompanying drawings. However, the implementation modes of the utility model are not limited to the specific details in the above implementation modes. Within the technical concept of the implementation modes of the utility model, the technical scheme of the implementation modes of the utility model can be subjected to a variety of simple modifications, and these simple modifications all belong to the protection scope of the implementation modes of the utility model. It should also be noted that the various specific technical features described in the above specific implementation modes can be combined in any suitable manner without contradiction. In order to avoid unnecessary repetition, the various possible combinations of the implementation modes of the utility model will not be described separately.

[0074] In addition, various implementations of the embodiments of the present utility model can also be arbitrarily combined, as long as they do not violate the concept of the embodiments of the present utility model, they should also be regarded as the contents disclosed in the embodiments of the present utility model.

Claims

1. A fuel filter, comprising a filter body (11), wherein one end of the body (11) is provided with an oil inlet pipe (111) and the other end is provided with an oil outlet pipe (112), characterized in that: A first filter element (12), a second filter element (13) and a third filter element (14) are sequentially connected from the oil inlet pipe (111) to the oil outlet pipe (112), and the filter holes of the three filter elements decrease in sequence from the first filter element (12) to the third filter element (14); each filter element is arranged on its bracket, and the bracket can be rotated or pulled relative to the main body (11); and the main body (11) is also provided with a water-oil separation device (18) on the oil outlet side.

2. The fuel filter according to claim 1, characterized in that: The three filter elements are arranged in sequence from top to bottom; the filter comprises three coaxially arranged inner cores, the three filter elements are respectively mounted on the outer sides of the inner cores, and the bracket is cylindrical and mounted on the outer sides of the filter elements; the first bracket (15) is provided with a plurality of first through holes (151) at the edge of the outer side of the first filter element (12) at the end plate close to the second filter element (13); the second bracket (16) is provided with a second through hole (161) connecting the second inner core (192) and the third inner core (193) at the end plate close to the third filter element (14); the third bracket (17) is provided with a plurality of third through holes (171) at the edge of the oil outlet end plate, and the oil outlet end plate is provided with the oil outlet pipe (112); the filter further comprises a connecting shaft (113) connecting the three brackets, and the bracket is rotatably connected to the connecting shaft (113) through a hinge structure; the water-oil separation device (18) is provided at the bottom of the body (11).

3. The fuel filter according to claim 1, characterized in that: The three filter elements are arranged in sequence from the inside to the outside; the body (11) is cylindrical, an inner core (19) is arranged in the body (11), the three brackets are concentrically arranged sleeves with diameters increasing from the inside to the outside, and the three filter elements are respectively and correspondingly mounted on the outsides of the three brackets; the three brackets are arranged in the body (11) and can be pulled out and pushed in along the axial direction of the body (11); the water-oil separation device (18) is arranged at the bottom of the body (11).

4. The fuel filter according to claim 3, characterized in that: The extension direction of the first filter hole (121) of the first filter element (12) forms an angle of 45° relative to the axial direction of the inner core (19), the extension direction of the second filter hole (131) of the second filter element (13) forms an angle of 90° relative to the first filter hole (121), and the extension direction of the third filter hole (141) of the third filter element (14) forms an angle of 90° relative to the second filter hole (131).

5. The fuel filter according to any one of claims 1 to 3, characterized in that: The water-oil separation device (18) comprises a water outlet pipe (181) on the oil outlet side end plate of the main body (11); an inner extending port (1811) of the water outlet pipe and an inner extending port (1121) of the oil outlet pipe are provided with a height difference, and the inner extending port (1121) of the oil outlet pipe is higher than the inner extending port (1811) of the water outlet pipe; and the main body (11) is further provided with at least one retention groove (182) on the oil outlet side end plate, and the groove of the retention groove (182) is lower than the inner extending port (1811) of the water outlet pipe.

6. A fuel system for a vehicle, comprising: An oil tank (2), wherein an oil pump is provided in the oil tank (2); An intake manifold (3), wherein the oil pump is connected to the engine (5) via an oil rail (4); a first filter (1), arranged between the oil pump and the oil rail (4), wherein the first filter (1) adopts the structure as claimed in any one of claims 1 to 5; a pressure regulating valve (6), wherein the inlet of the pressure regulating valve (6) is connected to the outlet of the first filter (1), and the outlet of the pressure regulating valve (6) is connected to the oil tank (2); It is characterized in that the fuel system further comprises a monitoring device (7) for monitoring whether the first filter (1) is clogged, and the monitoring device (7) is connected to the first filter (1).

7. The fuel system according to claim 6, characterized in that: The monitoring device (7) is a monitoring valve (71), the oil inlet of the monitoring valve (71) is arranged between the oil tank (2) and the oil inlet of the first filter (1), and the oil outlet of the monitoring valve (71) is connected to the oil tank (2); the preset opening pressure of the monitoring valve (71) is greater than the engine demand pressure and less than the sum of the engine demand pressure and the pressure drop threshold of the first filter (1).

8. The fuel system according to claim 6, characterized in that: The monitoring device (7) comprises a monitoring valve (71), a second filter (72) and a pressure sensor (73); the oil inlet of the monitoring valve (71) is arranged between the oil tank (2) and the oil inlet of the first filter (1); the oil outlet of the monitoring valve (71) is connected to the oil inlet of the second filter (72); the oil outlet of the second filter (72) is connected to the oil rail (4) via the pressure sensor (73); the preset opening pressure of the monitoring valve (71) is greater than the engine demand pressure and less than the sum of the engine demand pressure and the pressure drop threshold of the first filter (1).

9. The fuel system according to claim 7 or 8, characterized in that: The preset opening pressure of the monitoring valve (71) is 95% to 99% of the sum of the engine demand pressure and the pressure drop threshold of the first filter.

10. A vehicle, characterized in that: It comprises an engine (5), and also comprises a fuel system as claimed in any one of claims 6 to 9, wherein the oil circuit of the fuel system is connected to the engine (5).

Images