Automatic pressure-stabilizing filtering structure and method for fuel filter

Abstract

The present invention discloses an automatic pressure-stabilizing filtering structure and method of a fuel filter, comprising a shunt filter seat, a pressure-stabilizing column core, a pressure-stabilizing column and a main filter element, the pressure-stabilizing column being inserted in the shunt filter seat, and the pressure-stabilizing column being fixedly connected to the shunt filter seat, the pressure-stabilizing column core being arranged in the pressure-stabilizing column, and the pressure-stabilizing column core dividing the pressure-stabilizing column cavity into a pressure-stabilizing front cavity and a pressure-stabilizing rear cavity, an upper spring being arranged in the pressure-stabilizing front cavity, and a lower spring being arranged in the pressure-stabilizing rear cavity, the upper end of the pressure-stabilizing column core being connected to a pull rod through a guide rod, a detection wheel being arranged at the upper end of the pull rod, and an induction switch being arranged on the side of the detection wheel; the filter element structure adopts an upper and lower arrangement, which effectively solves the problem of insufficient oil filtration due to the flow resistance of the filter element, and completely changes the pressure-stabilizing method of the traditional filter, and when the flow resistance of the filter element is high, a pollution alarm is realized, and the oil can directly enter the oil outlet joint, that is, the bypass function of the fuel filtration is realized, so as to ensure that the oil volume filtered by the fuel filter meets the system requirements.

Description

Technical Field

[0001] The invention relates to the technical field of oil pressure stabilization filtration, and in particular to an automatic pressure stabilization filtration structure and method of a fuel filter. Background Art

[0002] A fuel filter is a device used to clean fuel to protect the normal operation of the engine and fuel system. A fuel filter is generally composed of a housing, a filter element, an inlet and outlet interface, a drain valve, and a bypass valve. The filter elements in all filter products require maintenance. Currently, regular maintenance is generally adopted to replace the filter elements regularly, but this method is unscientific and can easily lead to two results. One is that the flow resistance is already high and the downstream oil supply cannot meet the use requirements, but it is not time for regular maintenance, resulting in reduced performance and even the risk of damage. The other is that the product can still be used within the required range, but it is replaced regularly, resulting in performance waste and cost waste. In order to ensure the stability of the heavy pressure of the oil filtration system, a regulating valve and a pressure sensor are generally provided in the filtration system to adjust the flow of the oil to meet the needs of the system. Chinese Patent Application No. 202310675193 .X discloses a long-life oil filter, including a shell and a filter element, the shell consists of an upper shell and a lower shell, the upper end of the lower shell is fixedly connected to the lower end of the upper shell, and the filter element is arranged inside the shell; in order to reduce the flow resistance of the filter element and extend the service life, the filter element adopts a double-layer structure of an outer filter layer and an inner filter layer, so that the filtration area can be increased, but at the same time the diameter of the filter is increased. After a period of use, the flow resistance becomes larger and the voltage stabilization requirement cannot be met. In addition, the labyrinth dirt-containing cavity arranged at the bottom of the shell can only accommodate downward oil stains, and most of the oil stains clog the filter element. Although the service life of the filter element is extended to a certain extent, the effect is not good. Similarly, the oil filter also needs to replace the filter element regularly. Chinese patent application No. 202221709442.X discloses a fuel filter, the filter element adopts a regular hexagonal structure, which greatly increases the number of filtration layers; but the above-mentioned problems also exist;

[0003] Another filter pressure stabilizing structure integrates a pressure differential signal device and a bypass valve in the filter. When the filter element is blocked to a certain extent, the bypass valve opens to ensure the oil supply to the downstream system. However, the filter element of this filter also needs to be replaced regularly, and when the bypass valve is opened, the oil is directly discharged to the downstream without being filtered, affecting the safe operation of the oil system. Therefore, an automatic pressure stabilizing filtering structure and method of a fuel filter are proposed to solve the above problems. Summary of the invention

[0004] The technical problem to be solved by the present invention is to overcome the existing defects and provide an automatic pressure-stabilizing filtering structure and method for a fuel filter. The filter element structure adopts an upper and lower arrangement, which will not increase the diameter of the filter, and effectively solves the problem of insufficient oil filtration due to the flow resistance of the filter element. It completely changes the pressure stabilization method of the traditional filter. There is no need to set a pressure differential signal device and a bypass valve, nor is there a need to set a pressure sensor and a regulating valve in the system. It ensures that the amount of oil filtered by the fuel filter meets the system requirements, realizes automatic pressure stabilization, saves the number of oil filter system components, and can effectively solve the problems in the background technology.

[0005] To achieve the above-mentioned purpose, the present invention provides the following technical solutions: an automatic pressure-stabilizing filtering structure and method for a fuel filter, comprising a flow-dividing filter seat, a pressure-stabilizing column core, a pressure-stabilizing column and a main filter element, the pressure-stabilizing column is inserted into the flow-dividing filter seat, and the pressure-stabilizing column is fixedly connected to the flow-dividing filter seat, the pressure-stabilizing column core is arranged in the pressure-stabilizing column, and the pressure-stabilizing column core divides the pressure-stabilizing column cavity into a pressure-stabilizing front cavity and a pressure-stabilizing rear cavity, an upper spring is arranged in the pressure-stabilizing front cavity, a lower spring is arranged in the pressure-stabilizing rear cavity, the upper end of the pressure-stabilizing column core is connected to a pull rod through a guide rod, a detection wheel is arranged at the upper end of the pull rod, and a sensing wheel is arranged on the side of the detection wheel A switch should be provided, an upper shell is arranged above the diverter filter seat, a pressure-stabilizing filter element is arranged in the upper shell, an oil inlet joint is arranged on one side of the diverter filter seat, an oil outlet joint is arranged on the other side of the diverter filter seat, a pressure-stabilizing tube is arranged between the oil outlet joint and the upper shell, the main filter element is arranged below the diverter filter seat, and the pressure-stabilizing column core is provided with a conducting oil channel, a pressure-stabilizing oil channel and a post-filter oil channel from top to bottom, an oil inlet chamber is arranged between the diverter filter seat and the pressure-stabilizing column, the oil inlet chamber is connected with the oil inlet joint, a pre-filter hole connected with the oil inlet chamber is arranged on the pressure-stabilizing column, and a through hole is arranged in the upper circumferential direction of the pressure-stabilizing column.

[0006] Furthermore, the post-filter oil channel connects the pressure-stabilizing rear chamber with the oil outlet joint, a bottom hole is provided at the bottom of the pressure-stabilizing rear chamber, the pressure-stabilizing oil channel is connected with the pressure-stabilizing front chamber, the conducting oil channel connects the oil inlet joint with the oil outlet joint, and sealing ring one, sealing ring two, sealing ring three and sealing ring four are provided on the outer circumferential surface of the pressure-stabilizing column core from top to bottom.

[0007] Furthermore, the lower end of the pull rod passes through the upper cover of the pressure-stabilizing filter element, and the lower end of the pull rod is rotatably connected to the upper end of the guide rod. The induction switch includes induction switch 1, induction switch 2 and induction switch 3. A bracket is provided on the side of the upper shell body, and induction switch 1, induction switch 2 and induction switch 3 are installed on the bracket in sequence from top to bottom.

[0008] Furthermore, an upper cover is provided at the upper end of the upper shell, the upper cover is threadedly connected to the upper shell, a compression spring is provided between the upper cover and the pressure-stabilizing filter element, a fixing ring is provided in the circumferential direction of the upper shell, and a fixing hole for fixing is provided on the fixing ring.

[0009] Furthermore, a support plate is arranged above the upper cover, and a support leg is arranged between the support plate and the upper cover. The support leg and the upper cover are fixed by bolts, and the pull rod passes through the center of the support plate.

[0010] Furthermore, a lower shell body is threadedly connected below the diverter filter seat, a supporting spring is provided on the bottom surface of the lower shell body, the lower end of the main filter element abuts against the supporting spring, an oil drain bolt is provided at the center of the lower end of the lower shell body, an annular groove is provided on the upper surface of the diverter filter seat, and the lower end of the upper shell body is provided in the annular groove.

[0011] Furthermore, an iron removal assembly is respectively provided on the inner side of the pressure stabilizing filter element and the outer side of the main filter element. The iron removal assembly includes an upper ring, a lower ring, an iron removal cover, a vertical magnetic column and annular ribs. The iron removal cover is arranged between the upper ring and the lower ring. A circular hole is arranged in the circumferential direction of the iron removal cover. The vertical magnetic column is vertically arranged on the outer circumferential surface of the iron removal cover. Magnetic columns are embedded in the vertical magnetic columns, and annular ribs are arranged between the vertical magnetic columns.

[0012] Furthermore, the outer side of the vertical magnetic column is evenly spaced with a receiving groove and a magnetic column groove, the magnetic column is fixed in the magnetic column groove, an auxiliary hole is opened at the bottom of the receiving groove, the cross-section of the annular rib is arranged in an arc structure, and drainage holes are evenly spaced on the annular rib.

[0013] Furthermore, an inclined hole is arranged on the lower circumferential surface of the oil inlet cavity, and a guide vane is arranged below the inclined hole.

[0014] Compared with the prior art, the present invention has the following beneficial effects:

[0015] 1. The filter element structure adopts an up-and-down arrangement, which will not increase the diameter of the filter, effectively solving the problem of insufficient oil filtration due to the flow resistance of the filter element, and completely changing the pressure stabilization method of the traditional filter. There is no need to set a pressure differential signal device and a bypass valve, nor is there a need to set a pressure sensor and a regulating valve in the system, ensuring that the amount of oil filtered by the fuel filter meets the system requirements, achieving automatic pressure stabilization, and saving the number of oil filter system parts.

[0016] 2. The oil in the front chamber of the pressure stabilizer is filtered through the pressure-stabilizing filter element, and then flows to the oil outlet joint through the pressure-stabilizing pipe, ensuring that the oil in the system runs under stable pressure to protect the components in the oil system and extend the service life of the equipment. The service life of the traditional fuel filter element is short, the filter element is frequently replaced, and the oil pressure of the filtered oil will change, affecting the system. Through the setting of the pressure-stabilizing filter element, the pressure difference before and after the filter is stabilized within the qualified range. The pressure-stabilizing filter element not only ensures the stability of the oil volume, but also greatly extends the service life of the fuel filter.

[0017] 3. This method is more scientifically designed. This method divides the fuel filter into an initial state, a prompt state and a warning state, so that the staff can clearly know the working condition of the fuel filter and determine whether to replace the filter element. It can effectively avoid the waste of resources caused by regular replacement of the filter element and reduce the cost of equipment maintenance.

[0018] 4. The specially designed iron removal component forms a magnetic interception net in the circumferential direction of the filter element. Before the oil enters the filter element for filtration, the magnetic substances in the oil are adsorbed and collected, which has a better iron removal effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a schematic diagram of the structure of the present invention;

[0020] Figure 2 It is a schematic diagram of the cross-sectional front view structure of the present invention;

[0021] Figure 3 This is a schematic diagram of the structure of the present invention without the upper and lower shells;

[0022] Figure 4 This is a schematic diagram of the structure of the diverter filter seat of the present invention when viewed from above;

[0023] Figure 5 This is a schematic diagram of the voltage-stabilizing column core structure of the present invention;

[0024] Figure 6 This is a schematic diagram of the front view structure of the voltage stabilizing column core of the present invention;

[0025] Figure 7 This is a schematic diagram of the cross-sectional structure of the diverter filter seat of the present invention;

[0026] Figure 8 This is a schematic diagram of the structure of the iron removal component of the present invention;

[0027] Fig. 9 It is a schematic diagram of the enlarged structure of point A of the present invention.

[0028] In the figure: 1 oil inlet connector, 2 lower housing, 3 flow divider filter seat, 4 oil outlet connector, 5 voltage regulator, 6 bracket, 7 induction switch three, 8 induction switch two, 9 induction switch one, 10 detection wheel, 11 support plate, 12 support leg, 13 upper cover, 14 fixing ring, 15 upper housing, 16 compression spring, 17 voltage regulator filter element, 18 voltage regulator front chamber, 19 voltage regulator rear chamber, 20 support spring, 21 oil drain bolt, 22 iron removal assembly, 23 main filter element, 24 guide vane, 25 inclined hole, 26 voltage regulator column core, 27 upper spring Spring, 28 pull rod, 29 lower spring, 30 pressure-stabilizing column, 31 through hole, 32 annular groove, 33 guide rod, 34 bottom hole, 35 pressure-stabilizing oil channel, 36 conducting oil channel, 37 sealing ring one, 38 sealing ring two, 39 sealing ring three, 40 sealing ring four, 41 post-filter oil channel, 42 oil inlet chamber, 43 pre-filter hole, 44 auxiliary hole, 45 circular hole, 46 vertical magnetic column, 47 annular rib, 48 lower ring, 49 upper ring, 50 iron removal cover, 51 magnetic column, 52 drainage hole, 53 receiving groove, 54 magnetic column groove. DETAILED DESCRIPTION

[0029] In the description of the present invention, it should be understood that the terms "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside" and "outside" etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0030] See also Figure 1-9The present invention provides a technical solution: an automatic pressure-stabilizing filtering structure and method of a fuel filter, comprising a diverter filter seat 3, a pressure-stabilizing column core 26, a pressure-stabilizing column 30 and a main filter element 23, wherein the pressure-stabilizing column 30 is inserted into the diverter filter seat 3, and the pressure-stabilizing column 30 is fixedly connected to the diverter filter seat 3, and the pressure-stabilizing column 30 and the diverter filter seat 3 are designed as a split structure, which can utilize the processing of parts. During the production and maintenance process, the split structure can reduce costs and improve production efficiency at the same time, and can also be designed as an integral structure, so that the structural strength is higher, the pressure-stabilizing column core 26 is arranged in the pressure-stabilizing column 30, the pressure-stabilizing column core 26 is in sliding contact with the inner wall of the pressure-stabilizing column 30, and the pressure-stabilizing column core 26 divides the cavity of the pressure-stabilizing column 30 into a pressure-stabilizing front cavity 18 and a pressure-stabilizing rear cavity 19, the pressure in the pressure-stabilizing front chamber 18 and the pressure-stabilizing rear chamber 19 is always in a dynamic balance state, the oil in the pressure-stabilizing front chamber 18 is unfiltered oil, and the pressure-stabilizing rear chamber 19 is oil filtered by the main filter element 23, an upper spring 27 is provided in the pressure-stabilizing front chamber 18, and a lower spring 29 is provided in the pressure-stabilizing rear chamber 19, and the lower spring 29 plays a role in supporting the pressure-stabilizing column core 26. Through the cooperation of the lower spring 29 and the upper spring 27, the pressure-stabilizing column core 26 is in a balanced state. When the main filter element 23 works for a period of time, the flow resistance of the main filter element 23 increases and the pressure after filtration decreases, that is, the pressure in the pressure-stabilizing rear chamber 19 decreases. At this time, the upper spring 27 overcomes the elastic force and pressure, and pushes the pressure-stabilizing column core 26 down, so that part of the unfiltered oil enters the pressure-stabilizing front chamber 18, and the pressure-stabilizing column core 26 The end is connected to the pull rod 28 through the guide rod 33, and the upper end of the pull rod 28 is provided with a detection wheel 10, and the side of the detection wheel 10 is provided with an induction switch, which is used to detect the position of the wheel 10 and reflect the working state of the filter element. An upper shell 15 is provided above the diverter filter seat 3, and a pressure-stabilizing filter element 17 is provided in the upper shell 15. The oil in the pressure-stabilizing front chamber 18 is filtered by the pressure-stabilizing filter element 17, and then flows to the oil outlet joint 4 through the pressure-stabilizing pipe 5, ensuring that the oil in the system runs under a stable pressure to protect the components in the oil system and extend the service life of the equipment. The service life of the traditional fuel filter element is short, the filter element is frequently replaced, and the oil pressure of the filtered oil will change, which will affect the system. By setting the pressure-stabilizing filter element 17, the pressure before and after the filter can be adjusted. The difference is stable within the qualified range. The pressure-stabilizing filter element 17 not only ensures the stability of the oil volume, but also greatly prolongs the service life of the fuel filter. An oil inlet connector 1 is arranged on one side of the shunt filter seat 3, and an oil outlet connector 4 is arranged on the other side of the shunt filter seat 3. A pressure-stabilizing tube 5 is arranged between the oil outlet connector 4 and the upper shell 15. The pressure-stabilizing tube 5 is used to add filtered oil to the oil connector 4 to ensure that the oil output of the oil outlet connector 4 is in a stable state. In the oil system, a pressure-stabilizing valve is generally required to maintain a stable pressure of the oil in the system. The fuel filter does not need to be provided with a pressure-stabilizing valve, and ensures that the filtered oil is in a stable pressure state. There is no need to adjust the valve flow like a pressure-stabilizing valve, which saves oil system parts. The main filter element 23 is arranged below the shunt filter seat 3.The pressure stabilizing column core 26 is provided with a conducting oil passage 36, a pressure stabilizing oil passage 35 and a post-filter oil passage 41 from top to bottom. When the pressure difference changes, the pressure stabilizing column core 26 drops to realize the change of oil passage connection. An oil inlet chamber 42 is provided between the flow divider filter seat 3 and the pressure stabilizing column body 30. The oil inlet chamber 42 is connected to the oil inlet joint 1. The pressure stabilizing column body 30 is provided with a pre-filter hole 43 connected to the oil inlet chamber 42. When the position of the pressure stabilizing column core 26 changes, the pre-filter hole 43 can be connected to the pressure stabilizing oil passage 35 or the conducting oil passage 36 to realize the switching of different working states. A through hole 31 is provided in the upper circumferential direction of the pressure stabilizing column body 30. The through hole 31 is connected to the pre-pressure stabilizing chamber 18. The oil in the pre-pressure stabilizing chamber 18 flows to the pressure stabilizing filter element 17 through the through hole 31.

[0031] The post-filter oil passage 41 connects the pressure-stabilizing rear chamber 19 with the oil outlet joint 4. A bottom hole 34 is provided at the bottom of the pressure-stabilizing rear chamber 19. The oil filtered by the main filter element 23 enters the pressure-stabilizing rear chamber 19 through the bottom hole 34, and then is discharged through the post-filter oil passage 41 and the oil outlet joint 4. The pressure-stabilizing oil passage 35 is connected with the pressure-stabilizing front chamber 18. The conducting oil passage 36 connects the oil inlet joint 1 with the oil outlet joint 4. When the main filter element 23 and the pressure-stabilizing filter element 17 are clogged by impurities, resulting in too low pressure after oil filtration, the oil inlet joint 1 and the oil outlet joint 4 are connected. The connector 4 is directly connected through the conducting oil passage 36 to ensure the safety of the fuel system. This structure is a protective structure. It will only be directly connected if the filter element is not replaced for a long time or the filter fails. It is an emergency protection structure. The outer circumferential surface of the pressure stabilizing column core 26 is provided with a sealing ring 1 37, a sealing ring 2 38, a sealing ring 39 and a sealing ring 4 40 from top to bottom. The sealing ring plays a role in isolating the oil, so that the pressure stabilizing oil passage 35 and the conducting oil passage 36 are separated from each other, and oil leakage will not occur.

[0032] The lower end of the pull rod 28 passes through the upper cover of the pressure-stabilizing filter element 17, and a sealing ring is provided between the pull rod 28 and the upper cover for sealing. The pressure-stabilizing filter element 17 and the main filter element 23 are conventional filter elements. The filter element is generally composed of paper, synthetic fiber, skeleton, upper cover and lower cover to ensure that the filter element can effectively filter impurities in the oil and protect the normal operation of the engine or equipment. This part is conventional technology and will not be described in detail here. The lower end of the pull rod 28 is rotatably connected to the upper end of the guide rod 33. The rotatable connection is a conventional mechanical connection method, such as bearings, universal joints, The rotary joint realizes the rotation connection. The detection wheel 10 is the detection part of the induction switch and can also be used as a handle. After replacing the filter element, the pressure stabilizing column core 26 is restored to its initial state by pulling the pull rod 28. The pressure stabilizing column core 26 is at the uppermost end. At this time, the pre-filter hole 43 directly corresponds to the outer wall of the pressure stabilizing column core 26. The oil of the oil inlet joint 1 all enters the oil inlet chamber 42. The oil filtered by the main filter element 23 all flows out through the post-filter oil channel 41 and the oil outlet joint 4. The induction switch includes an induction switch 1 9, an induction switch 2 8 and an induction switch 3 7. The side of the upper shell 15 is provided with There is a bracket 6, and the induction switch 1 9, the induction switch 2 8 and the induction switch 3 7 are installed on the bracket 6 from top to bottom. The induction switch 1 9, the induction switch 2 8 and the induction switch 3 7 are used to detect different working states of the fuel filter. The induction switch 1 9, the induction switch 2 8 and the induction switch 3 7 are electrically connected to external indicator lights respectively. The indicator lights are divided into green light, yellow light and red light. The induction switch 1 9 detects that the detection wheel 10 is in the initial state at this time, and the green light is on. The induction switch 2 8 detects that the detection wheel 10 is in the prompt state at this time, and the yellow light is on, and the main filter element 23 needs to be replaced. And the pressure-stabilizing filter element 17, at this time, all the unfiltered oil passes through the pressure-stabilizing oil channel 35 into the pressure-stabilizing front chamber 18, is filtered by the pressure-stabilizing filter element 17 and then enters the oil outlet connector 4 through the pressure-stabilizing tube 5. The induction switch three 7 detects that the detection wheel 10 is in the warning state at this time, and the red light is on. The main filter element 23 and the pressure-stabilizing filter element 17 must be replaced quickly. At this time, the oil is not filtered, and is directly discharged from the oil inlet connector 1 through the conducting oil channel 36 and the oil outlet connector 4. The induction switch three 7 can also be connected to an alarm, so that the prompt is more obvious. The specific warning method is selected according to the working environment.

[0033] An upper cover 13 is provided at the upper end of the upper shell 15, and the upper cover 13 is threadedly connected to the upper shell 15. A compression spring 16 is provided between the upper cover 13 and the pressure-stabilizing filter element 17. The compression spring 16 can compress the pressure-stabilizing filter element 17 to ensure that the installation structure of the pressure-stabilizing filter element 17 is firm. A fixing ring 14 is provided in the circumferential direction of the upper shell 15, and a fixing hole for fixing is provided on the fixing ring 14, which is used to be fixedly connected to the equipment through the fixing ring 14.

[0034] A support plate 11 is arranged above the upper cover 13, and a support leg 12 is arranged between the support plate 11 and the upper cover 13. The support leg 12 and the upper cover 13 are fixed by bolts. The pull rod 28 passes through the center of the support plate 11, and the support plate 11 plays a role in guiding and supporting the pull rod 28.

[0035] The lower shell body 2 is threadedly connected to the lower part of the diverter filter seat 3, and a supporting spring piece 20 is provided on the bottom surface of the lower shell body 2. The lower end of the main filter element 23 abuts against the supporting spring piece 20. The supporting spring piece 20 is supported by a metal sheet to elastically support the main filter element 23. An oil drain bolt 21 is provided at the center of the lower end of the lower shell body 2. The oil drain bolt 21 is used for draining dirt at the bottom of the lower shell body 2. An annular groove 32 is provided on the upper surface of the diverter filter seat 3. The lower end of the upper shell body 15 is arranged in the annular groove 32, which is used to position the lower end of the upper shell body 15 during processing.

[0036] An iron removal component 22 is provided on the inner side of the pressure-stabilizing filter element 17 and the outer side of the main filter element 23, respectively. The iron removal component 22 is provided on the unfiltered side of the filter element oil to remove magnetic substances in the oil, reduce blockage of the filter element, and extend the service life of the equipment. The iron removal component 22 includes an upper ring 49, a lower ring 48, an iron removal cover 50, a vertical magnetic column 46 and an annular rib 47. The iron removal cover 50 is provided between the upper ring 49 and the lower ring 48. A circular hole 45 is provided in the circumferential direction of the iron removal cover 50. The vertical magnetic column 46 is vertically arranged on the outer circumferential surface of the iron removal cover 50. A magnetic column 51 is embedded in the vertical magnetic column 46. An annular rib 47 is provided between the vertical magnetic columns 46. The magnetic column 51 can make the vertical magnetic column 46 and the annular rib 47 have a certain magnetism. The annular rib 47 and the vertical magnetic column 46 are arranged vertically and horizontally to form a magnetic interception net. Before the oil enters the main filter element 23, the magnetic substances in the oil are adsorbed to remove iron comprehensively.

[0037] The outer side surface of the vertical magnetic column 46 is evenly spaced with a receiving groove 53 and a magnetic column groove 54. The magnetic column 51 is fixed in the magnetic column groove 54. An auxiliary hole 44 is provided at the bottom of the receiving groove 53 to guide the magnetic substance in the oil and collect the magnetic substance in the receiving groove 53 as much as possible. The cross-section of the annular rib 47 is arranged in an arc structure, and drainage holes 52 are evenly spaced on the annular rib 47, which can also guide the oil to flow to the main filter element 23 through the drainage holes 52. The concave surface of the annular rib 47 can also be used to collect magnetic substances.

[0038] An inclined hole 25 is provided on the lower circumferential surface of the oil inlet chamber 42, and a guide vane 24 is provided below the inclined hole 25. The inclined hole 25 can make the oil in the oil inlet chamber 42 tilt downward, and then guide the oil through the guide vane 24 to make the oil move tilt downward in the circumferential direction, which can reduce resistance.

[0039] The automatic voltage stabilizing filtering method comprises the following steps:

[0040] Step 1: In the initial state, the detection wheel 10 is located at the induction switch 9, the pre-filter hole 43 corresponds to the outer wall of the voltage-stabilizing column core 26, and the oil can only move downward when entering the oil inlet chamber 42. The oil passes through the oil inlet connector 1 and enters the oil inlet chamber 42 downward, and passes through the inclined hole 25 and the guide vane 24 in turn to enter the lower housing 2. Then, the oil is deironed by the deironing assembly, filtered by the main filter element 23, and then enters the voltage-stabilizing rear chamber 19 upward, and then discharged through the post-filter oil passage 41 and the oil outlet connector 4. At this time, the main filter element 23 works normally to meet the pressure of the oil system;

[0041] Step 2: The initial state transitions to the prompt state, that is, the detection wheel 10 transitions from the induction switch 1 9 to the induction switch 2 8. As the main filter element 23 works for a long time, the oil flow resistance increases, and the pressure in the pressure-stabilizing rear chamber 19 gradually decreases. The upper spring 27 pushes the pressure-stabilizing column core 26 to move downward, and the front filter hole 43 is connected to the pressure-stabilizing oil channel 35. During this process, part of the oil in the oil inlet chamber 42 passes through the front filter hole 43 and the pressure-stabilizing oil channel 35 and enters the pressure-stabilizing front chamber 18 upward. After the oil in the pressure-stabilizing front chamber 18 passes through the iron removal component and the pressure-stabilizing filter element 17, the oil is replenished in the oil outlet joint 4 through the pressure-stabilizing tube 5. At this time, only the main filter element 23 needs to be replaced, and the filtering capacity of the filter in this state can also meet the requirements of the oil system.

[0042] Step 3: Prompt state, the detection wheel 10 corresponds to the induction switch 2 8, the pressure stabilizing column core 26 continues to move downward, the filter front hole 43 is completely connected with the pressure stabilizing oil channel 35, the oil in the oil inlet chamber 42 all enters the pressure stabilizing front chamber 18, the filter is completely filtered by the pressure stabilizing filter element 17, at this time, the main filter element 23 and the pressure stabilizing filter element 17 need to be replaced, and the filtering capacity of the filter in this state can also meet the oil system;

[0043] Step 4: The boiler transitions from the prompt state to the warning state. As the pressure-stabilizing filter element 17 is blocked, the pressure-stabilizing column core 26 continues to move downward, and the pre-filter hole 43 is connected with the oil passage 36. During this process, part of the oil in the oil inlet chamber 42 is directly discharged to the oil outlet connector 4 through the oil passage 36. Although the pressure can be stabilized so that the oil pressure meets the system requirements, the quality of the oil filtered by the fuel filter in this state can no longer meet the system requirements.

[0044] Step 5: Warning state, the detection wheel 10 corresponds to the induction switch three 7, the voltage-stabilizing filter element 17 drops to the lowest lower end, the pre-filter hole 43 is connected with the conductive oil channel 36, and all the oil in the oil inlet chamber 42 is directly discharged to the oil outlet connector 4 through the conductive oil channel 36. At this time, it is necessary to stop the machine immediately and replace the filter element.

[0045] When the filter element flow resistance is high, a contamination alarm is activated, and the oil can directly enter the oil outlet joint, that is, the bypass function of the fuel filter, ensuring that the amount of oil filtered by the fuel filter meets the system requirements.

[0046] The basic principles, main features and advantages of the present invention are shown and described above. Without departing from the spirit and scope of the present invention, the present invention may also be subject to various changes and improvements, which all fall within the scope of the present invention to be protected.

Claims

1. An automatic pressure-stabilizing filter structure for a fuel filter, comprising a flow-dividing filter seat (3), a pressure-stabilizing column core (26), a pressure-stabilizing column (30) and a main filter element (23), characterized in that: The pressure stabilizing column (30) is inserted into the flow diversion filter seat (3), and the pressure stabilizing column (30) is fixedly connected to the flow diversion filter seat (3). The pressure stabilizing column core (26) is arranged in the pressure stabilizing column (30), and the pressure stabilizing column core (26) is in sliding contact with the inner wall of the pressure stabilizing column (30). The pressure stabilizing column core (26) divides the cavity of the pressure stabilizing column (30) into a pressure stabilizing front cavity (18) and a pressure stabilizing rear cavity (19). The pressures in the pressure stabilizing front cavity (18) and the pressure stabilizing rear cavity (19) are always in a dynamic equilibrium state. The oil in the pressure stabilizing front cavity (18) is unfiltered oil, and the pressure stabilizing rear cavity (19) is oil filtered by the main filter element (23). An upper spring (27) is arranged in the pressure stabilizing front cavity (18). A lower spring (29) is arranged in the rear chamber (19); the upper end of the pressure stabilizing column core (26) is connected to a pull rod (28) via a guide rod (33); a detection wheel (10) is arranged at the upper end of the pull rod (28); an induction switch is arranged on the side of the detection wheel (10); an upper shell (15) is arranged above the diverter filter seat (3); a pressure stabilizing filter element (17) is arranged in the upper shell (15); oil in the pressure stabilizing front chamber (18) is filtered by the pressure stabilizing filter element (17) and then flows to the oil outlet joint (4) through the pressure stabilizing pipe (5); an oil inlet joint (1) is arranged on one side of the diverter filter seat (3); an oil outlet joint (4) is arranged on the other side of the diverter filter seat (3); the oil outlet joint (4) is connected to the upper shell A pressure stabilizing tube (5) is arranged between the main filter element (23) and the main filter element (23), which is arranged below the flow-dividing filter seat (3). The pressure stabilizing column core (26) is provided with a conducting oil passage (36), a pressure stabilizing oil passage (35) and a post-filter oil passage (41) from top to bottom. An oil inlet chamber (42) is arranged between the flow-dividing filter seat (3) and the pressure stabilizing column body (30). The oil inlet chamber (42) is communicated with the oil inlet joint (1). A pre-filter hole (43) communicating with the oil inlet chamber (42) is arranged on the pressure stabilizing column body (30). When the position of the pressure stabilizing column core (26) changes, the pre-filter hole (43) can be connected to the pressure stabilizing oil passage (35) or the conducting oil passage (36) to realize the switching of different working states. A through hole (31) is provided in the circumferential direction of the upper part of the body (30), the through hole (31) is connected to the pressure-stabilizing front chamber (18), the oil in the pressure-stabilizing front chamber (18) flows to the pressure-stabilizing filter element (17) through the through hole (31), the post-filter oil passage (41) is connected to the pressure-stabilizing rear chamber (19) and the oil outlet joint (4), the bottom of the pressure-stabilizing rear chamber (19) is provided with a bottom hole (34), the oil filtered by the main filter element (23) enters the pressure-stabilizing rear chamber (19) through the bottom hole (34), and then is discharged through the post-filter oil passage (41) and the oil outlet joint (4), the pressure-stabilizing oil passage (35) is connected to the pressure-stabilizing front chamber (18), and the conducting oil passage (36) is connected to the oil inlet joint (1) and the oil outlet joint (4).

2. The automatic pressure-stabilizing filtering structure of a fuel filter according to claim 1, characterized in that: The outer circumferential surface of the pressure stabilizing column core (26) is provided with a sealing ring 1 (37), a sealing ring 2 (38), a sealing ring 3 (39) and a sealing ring 4 (40) in sequence from top to bottom.

3. The automatic pressure-stabilizing filtering structure of a fuel filter according to claim 2, characterized in that: The lower end of the pull rod (28) passes through the upper cover of the pressure-stabilizing filter element (17), and the lower end of the pull rod (28) is rotatably connected to the upper end of the guide rod (33). The inductive switch comprises an inductive switch 1 (9), an inductive switch 2 (8), and an inductive switch 3 (7). A bracket (6) is provided on the side of the upper shell (15), and the inductive switch 1 (9), the inductive switch 2 (8), and the inductive switch 3 (7) are sequentially mounted on the bracket (6) from top to bottom.

4. The automatic pressure-stabilizing filtering structure of a fuel filter according to claim 1, characterized in that: An upper cover (13) is provided at the upper end of the upper shell (15), the upper cover (13) is threadedly connected to the upper shell (15), a compression spring (16) is provided between the upper cover (13) and the pressure-stabilizing filter element (17), a fixing ring (14) is provided in the circumferential direction of the upper shell (15), and a fixing hole for fixing is provided on the fixing ring (14).

5. The automatic pressure-stabilizing filtering structure of a fuel filter according to claim 4, characterized in that: A support plate (11) is arranged above the upper cover (13), a support leg (12) is arranged between the support plate (11) and the upper cover (13), the support leg (12) and the upper cover (13) are fixed by bolts, and a pull rod (28) passes through the center of the support plate (11).

6. The automatic pressure-stabilizing filtering structure of a fuel filter according to claim 1, characterized in that: The lower shell (2) is threadedly connected to the lower side of the flow-dividing filter seat (3); a supporting spring (20) is provided on the bottom surface of the lower shell (2); the lower end of the main filter element (23) abuts against the supporting spring (20); an oil drain bolt (21) is provided at the center of the lower end of the lower shell (2); an annular groove (32) is provided on the upper surface of the flow-dividing filter seat (3); and the lower end of the upper shell (15) is arranged in the annular groove (32).

7. The automatic pressure-stabilizing filtering structure of a fuel filter according to claim 3, characterized in that: An iron removal assembly (22) is provided on the inner side of the pressure-stabilizing filter element (17) and the outer side of the main filter element (23), respectively. The iron removal assembly (22) comprises an upper ring (49), a lower ring (48), an iron removal cover (50), a vertical magnetic column (46) and an annular rib (47). The iron removal cover (50) is provided between the upper ring (49) and the lower ring (48). A circular hole (45) is provided in the circumferential direction of the iron removal cover (50). The vertical magnetic column (46) is vertically arranged on the outer circumferential surface of the iron removal cover (50). A magnetic column (51) is embedded in the vertical magnetic column (46). An annular rib (47) is provided between the vertical magnetic columns (46).

8. The automatic pressure-stabilizing filtering structure of a fuel filter according to claim 7, characterized in that: The outer side surface of the vertical magnetic column (46) is provided with a receiving groove (53) and a magnetic column groove (54) at equal intervals, the magnetic column (51) is fixed in the magnetic column groove (54), an auxiliary hole (44) is provided at the bottom of the receiving groove (53), the cross section of the annular rib (47) is arranged in an arc-shaped structure, and drainage holes (52) are provided on the annular rib (47) at equal intervals.

9. The automatic pressure-stabilizing filtering structure of a fuel filter according to claim 8, characterized in that: An inclined hole (25) is provided on the lower circumferential surface of the oil inlet chamber (42), and a guide vane (24) is provided below the inclined hole (25).

10. An automatic pressure-stabilizing filtration method for a fuel filter, characterized in that: The automatic pressure-stabilizing filtering structure of a fuel filter according to claim 9 comprises the following steps: Step 1: In the initial state, the detection wheel (10) is located at the induction switch 1 (9), and the oil enters the oil inlet chamber (42) through the oil inlet joint (1) and flows downward, and then passes through the inclined hole (25) and the guide vane (24) to enter the lower housing (2). Then, the oil is deironed by the deironing assembly, filtered by the main filter element (23), and then flows upward to the pressure-stabilizing rear chamber (19), and then discharged through the post-filter oil passage (41) and the oil outlet joint (4). At this time, the main filter element (23) is working normally. Step 2: The initial state transitions to the prompt state. As the main filter element (23) works for a long time, the oil flow resistance increases, and the pressure in the pressure-stabilizing rear chamber (19) gradually decreases. The upper spring (27) pushes the pressure-stabilizing column core (26) to move downward, and the front filter hole (43) is connected to the pressure-stabilizing oil passage (35). During this process, part of the oil in the oil inlet chamber (42) passes through the front filter hole (43) and the pressure-stabilizing oil passage (35) and flows upward into the pressure-stabilizing front chamber (18). After the oil in the pressure-stabilizing front chamber (18) passes through the iron removal component and the pressure-stabilizing filter element (17), the oil is replenished into the oil outlet joint (4) through the pressure-stabilizing pipe (5). At this time, only the main filter element (23) needs to be replaced. Step 3: In the prompt state, the detection wheel (10) corresponds to the induction switch 2 (8), the pressure stabilizing column core (26) continues to move downward, the filter front hole (43) is completely connected with the pressure stabilizing oil channel (35), and the oil in the oil inlet chamber (42) all enters the pressure stabilizing front chamber (18). The filter is completely filtered by the pressure stabilizing filter element (17). At this time, the main filter element (23) and the pressure stabilizing filter element (17) need to be replaced; Step 4: The prompt state transitions to the warning state. As the pressure-stabilizing filter element (17) is blocked, the pressure-stabilizing column core (26) continues to move downward, and the pre-filter hole (43) is connected to the oil passage (36). During this process, part of the oil in the oil inlet chamber (42) is directly discharged to the oil outlet joint (4) through the oil passage (36); Step 5: In the warning state, the detection wheel (10) corresponds to the induction switch three (7), the pressure-stabilizing filter element (17) drops to the lowest lower end, the filter front hole (43) is connected to the oil passage (36), and all the oil in the oil inlet chamber (42) is directly discharged to the oil outlet joint (4) through the oil passage (36).

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