Pressure warning device, fuel filter and vehicle

Abstract

The present application belongs to the technical field of vehicle, and discloses a pressure warning device, a fuel filter and a vehicle. The pressure warning device is arranged on an oil inlet pipe or an oil outlet pipe of the fuel filter. The warning device housing of the pressure warning device has a warning device inner cavity. A diaphragm is arranged in the warning device inner cavity and separates the warning device inner cavity into a first cavity and a second cavity. The first cavity is in communication with the inner cavity of the oil inlet pipe or the inner cavity of the oil outlet pipe. The diaphragm can be deformed in a first direction. An indicating member is arranged in the second cavity and slides in the first direction. A first elastic member is arranged to provide an elastic force for the sliding of the indicating member, so that the indicating member is always in close contact with the diaphragm, and the elastic force is applied to the diaphragm. When the pressure in the first cavity is normal, the sum of the elastic force of the first elastic member and the pressure in the second cavity is balanced with the pressure in the first cavity. When the pressure in the first cavity decreases, the stress conditions at both ends of the diaphragm change, the first elastic member drives the indicating member to move towards the first cavity, so that the stress on both sides of the diaphragm is balanced.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of vehicles, in particular to a pressure warning device, a fuel filter and a vehicle. BACKGROUND

[0002] In the fuel filter, the filter element is used to filter the fuel to remove impurities in the fuel. The existing fuel filter generally comprises a shell and a filter element arranged in the shell. The oil flows into the oil inlet cavity in the shell from the oil inlet pipeline, is filtered by the filter element, enters the oil outlet cavity, and is discharged from the oil outlet pipeline. During the operation of the fuel filter, the oil pressure of the oil inlet pipeline or the oil outlet pipeline needs to be monitored to prevent the pressure difference between the oil inlet pipeline and the oil outlet pipeline from being too large.

[0003] The conventional scheme usually sets a pressure sensor on the oil inlet pipeline or the oil outlet pipeline to detect the pressure, but the detection accuracy of this scheme depends on the accuracy of the pressure sensor, and once the pressure sensor is damaged, the detection result will be incorrect. SUMMARY

[0004] According to one aspect of the present application, the present application provides a pressure warning device to solve the problem that in the prior art, when a pressure sensor is used to detect the pressure, the detection accuracy depends on the accuracy of the pressure sensor, and once the pressure sensor is damaged, the detection result will be incorrect.

[0005] To achieve the above purpose, the present application adopts the following technical scheme:

[0006] The pressure warning device is arranged on the oil inlet pipeline or the oil outlet pipeline of the fuel filter.

[0007] It comprises:

[0008] The warning device housing has a warning device cavity.

[0009] The diaphragm is arranged in the warning device cavity and divides the warning device cavity into a first cavity and a second cavity. The first cavity can communicate with the inner cavity of the oil inlet pipeline or the inner cavity of the oil outlet pipeline. The diaphragm can be deformed in a first direction.

[0010] The indicator is slidably arranged in the second cavity in the first direction.

[0011] The first elastic member is used to provide an elastic force to make the indicator slide, so that the indicator is always in close contact with the diaphragm.

[0012] As a preferred scheme of the pressure warning device, the warning device housing comprises a warning device body and an identification structure connected to the warning device body. The diaphragm is arranged in the warning device body, and the indicator is slidably arranged in the identification structure. The identification structure is made of a light-transmitting material.

[0013] The identification structure is provided with a scale mark.

[0014] The pressure alarm further comprises:

[0015] A push rod is arranged in the first cavity in a sliding manner along the first direction.

[0016] A second elastic member is arranged to provide an elastic force for sliding the push rod, so that the push rod is always in abutment with the diaphragm.

[0017] The push rod comprises a push rod sliding block and a baffle arranged on the push rod sliding block, the push rod sliding block is capable of sliding along the first direction relative to the push rod sliding groove, the baffle is arranged in the first cavity in a sliding manner along the first direction, the push rod sliding block is in abutment with the side wall of the push rod sliding groove, the side wall of the push rod sliding groove is provided with an interface, and the interface is in communication with the first cavity.

[0018] The push rod sliding block is capable of sliding along the first direction to have a closed position and a conducting position, when the push rod sliding block is in the closed position, the push rod sliding block closes the interface, so that the inner cavity of the oil inlet pipe is separated from the interface, or the inner cavity of the oil outlet pipe is separated from the interface; when the push rod sliding block is in the conducting position, the push rod sliding block opens the interface, and the inner cavity of the oil inlet pipe or the inner cavity of the oil outlet pipe is in communication with the interface.

[0019] The baffle is in abutment with the cavity wall of the first cavity, the baffle is provided with a flow guide hole, and the first cavities at both ends of the baffle are in communication through the flow guide hole.

[0020] The indicating member is provided with an abutment portion, and the abutment portion is capable of abutting against one end of the identification structure away from the alarm body.

[0021] According to another aspect of the present application, a fuel filter is provided, comprising the above-mentioned pressure alarm, and further comprising an oil inlet pipe and an oil outlet pipe, and the pressure alarm is arranged on the oil inlet pipe or the oil outlet pipe.

[0022] According to still another aspect of the present application, a vehicle is provided, comprising the above-mentioned fuel filter.

[0023] The present application has the following beneficial effects:

[0024] The present application provides a pressure warning device for being arranged in an oil inlet pipe or an oil outlet pipe of a fuel filter, which comprises a warning device housing, a diaphragm, an indicating member and a first elastic member. The warning device housing has a warning device cavity, the diaphragm is arranged in the warning device cavity and divides the warning device cavity into a first cavity and a second cavity, the first cavity is capable of communicating with the inner cavity of the oil inlet pipe or the inner cavity of the oil outlet pipe, and the diaphragm is capable of deforming in a first direction. The indicating member is arranged in the second cavity and slides in the first direction, and the first elastic member is used for providing an elastic force for sliding the indicating member so as to always abut against the diaphragm and thus apply the elastic force to the diaphragm. The pressure in the first cavity is generally greater than the pressure in the second cavity, and when the pressure in the first cavity is normal, the sum of the elastic force of the first elastic member and the pressure in the second cavity is balanced with the pressure in the first cavity. When the pressure in the first cavity decreases, the stress conditions on both sides of the diaphragm change, the first elastic member drives the indicating member to move towards the first cavity, so as to balance the stress on both sides of the diaphragm. At this time, the oil pressure in the first cavity can be quantitatively judged by the position of the indicating member, so as to judge whether the oil pressure in the inner cavity of the oil inlet pipe or the oil outlet pipe is normal.

[0025] The present application also provides a fuel filter comprising the above pressure warning device, and a user can quantitatively judge the oil pressure in the first cavity by the position of the indicating member of the pressure warning device, so as to judge whether the oil pressure in the inner cavity of the oil inlet pipe or the oil outlet pipe is normal.

[0026] The present application also provides a vehicle comprising the above fuel filter and having the same effect as the fuel filter. BRIEF DESCRIPTION OF DRAWINGS

[0027] Figure 1 is a structural schematic view of a fuel filter in an embodiment of the present application;

[0028] Figure 2 is a sectional view of a fuel filter in an embodiment of the present application;

[0029] Figure 3 is Figure 2 is an enlarged view of A in FIG. 1;

[0030] Figure 4 is Figure 2 is an enlarged view of B in FIG. 1;

[0031] Figure 5 is Figure 2 is an enlarged view of C in FIG. 1;

[0032] Figure 6 is Figure 2 is an enlarged view of D in FIG. 1;

[0033] Figure 7 is a sectional view of a pressure detection pipe in an embodiment of the present application;

[0034] Figure 8 is a cross-sectional view of another pressure detection tube in an embodiment of the present application;

[0035] Figure 9 is Figure 8 an enlarged view of E in FIG. 1;

[0036] Figure 10 is a structural schematic view of a pressure alarm in an embodiment of the present application;

[0037] Figure 11 is a structural schematic view of another fuel filter in an embodiment of the present application Figure 1 ;

[0038] Figure 12 is a cross-sectional view of another fuel filter in an embodiment of the present application;

[0039] Figure 13 is Figure 12 an enlarged view of F in FIG. 2;

[0040] Figure 14 is Figure 12 an enlarged view of G in FIG. 2;

[0041] Figure 15 is a structural schematic view of another fuel filter in an embodiment of the present application Figure 2 ;

[0042] Figure 16 is Figure 15 an enlarged view of H in FIG. 3;

[0043] Figure 17 is a structural schematic view of still another fuel filter in an embodiment of the present application;

[0044] Figure 18 is a cross-sectional view of still another fuel filter in an embodiment of the present application;

[0045] Figure 19 is Figure 18 an enlarged view of I in FIG. 4.

[0046] In the drawings:

[0047] 100, housing; 101, oil inlet pipe; 102, oil outlet pipe; 110, oil cavity; 111, oil inlet cavity; 112, oil outlet cavity; 120, recess; 130, base, 140, upper shell; 150, collection cavity; 151, drain valve;

[0048] 200, filter assembly; 210, filter element; 211, window; 212, light-transmitting member; 220, upper end cover; 221, upper end cover opening;

[0049] 300, partition plate; 310, flow guide cavity; 311, oil inlet flow guide cavity; 312, oil outlet flow guide cavity; 320, flow guide; 321, inner flow guide; 322, outer flow guide; 323, oil passage; 330, accommodating groove;

[0050] 400, oil discharge pipe; 410, oil suction hole;

[0051] 500, pressure detection pipe; 501, first pipe segment; 502, second pipe segment; 5021, first limiting piece; 5022, second limiting piece; 503, third pipe segment; 510, pressure marking piece; 520, pressure pipe elastic piece;

[0052] 1, exhaust pipe; 11, first end; 12, second end; 13, upper accommodating groove;

[0053] 10, air guide pipe; 14, chute;

[0054] 2, floating ball;

[0055] 3, floating ball seat; 31, lower accommodating groove;

[0056] 4, exhaust passage structure; 41, exhaust passage; 42, base; 43, extension piece; 44, base elastic piece;

[0057] 5, float; 51, sliding piece; 52, blocking piece; 53, limiting piece;

[0058] 6, warning device shell; 61, first cavity; 62, second cavity; 63, warning device main body; 64, marking structure; 65, push rod chute; 66, interface;

[0059] 7, diaphragm;

[0060] 8, indicating piece; 81, first elastic piece; 82, abutting portion;

[0061] 9, push rod; 91, second elastic piece; 92, push rod slider; 93, baffle; 94, flow guide hole. DETAILED DESCRIPTION

[0062] The application will be further described below in conjunction with the drawings and embodiments. It can be understood that the specific embodiments described herein are only used to explain the application, and not to limit the application. In addition, it should be noted that, for the convenience of description, only the parts related to the application are shown in the drawings, not all the structures.

[0063] In the description of the present embodiment, the terms "upper", "lower", "left", "right", and the like, orientation or positional relationship are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of description and simplification of operation, and do not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the present application.

[0064] The existing fuel filter generally includes a shell and a filter element arranged in the shell. Oil flows into an oil inlet cavity in the shell from an oil inlet pipeline, is filtered by the filter element, enters an oil outlet cavity, and is discharged from an oil outlet pipeline. During operation of the fuel filter, the oil pressure of the oil inlet pipeline or the oil outlet pipeline needs to be monitored to prevent excessive pressure difference between the oil inlet pipeline and the oil outlet pipeline. The conventional scheme usually provides a pressure sensor on the oil inlet pipeline or the oil outlet pipeline to detect pressure, but the detection accuracy of this scheme depends on the accuracy of the pressure sensor, and once the pressure sensor is damaged, the detection result will be incorrect.

[0065] To solve the above problems, the present embodiment provides a pressure alarm to solve the problem that the detection accuracy of the pressure sensor in the prior art depends on the accuracy of the pressure sensor, and once the pressure sensor is damaged, the detection result will be incorrect. It can be used in the field of vehicle technology.

[0066] Reference Figures 1-10 The present embodiment provides a fuel filter, which can be a fuel coarse filter or other filter. The fuel filter includes a shell 100 and a filter assembly 200. The shell 100 has an oil cavity 110. The filter assembly 200 is installed in the oil cavity 110 and divides the oil cavity 110 into an oil inlet cavity 111 and an oil outlet cavity 112. The filter assembly 200 includes a filter element 210 and an upper end cover 220. The filter element 210 is configured to allow only oil to pass through and enter the oil outlet cavity 112 from the oil inlet cavity 111, thereby filtering dirty oil in the oil inlet cavity 111. The filtered clean oil enters the oil outlet cavity 112.

[0067] Continuing to refer to Figures 1-10 The fuel filter further includes an oil inlet pipeline 101 and an oil outlet pipeline 102. The oil inlet pipeline 101 is arranged in the shell 100, and the inner cavity of the oil inlet pipeline 101 communicates with the oil cavity 110, specifically the inner cavity of the oil inlet pipeline 101 communicates with the oil inlet cavity 111, so that the oil in the oil inlet pipeline 101 enters the oil inlet cavity 111. The oil outlet pipeline 102 is arranged in the shell 100, and the inner cavity of the oil outlet pipeline 102 communicates with the oil cavity 110, specifically the inner cavity of the oil outlet pipeline 102 communicates with the oil outlet cavity 112, so that the oil in the oil outlet cavity 112 is discharged through the oil outlet pipeline 102.

[0068] Optionally, the filter element 210 is in a cylindrical shape, the oil inlet cavity 111 is located outside the filter element 210, and the oil outlet cavity 112 is located inside the filter element 210. The oil inlet pipe 101 is connected to the lower sidewall of the shell 100, so that the inner cavity of the oil inlet pipe 101 communicates with the oil inlet cavity 111. The oil outlet pipe 102 is connected to the lower part of the shell 100, so that the inner cavity of the oil outlet pipe 102 communicates with the oil outlet cavity 112.

[0069] With reference back to Figures 1-10 , the fuel filter further comprises an exhaust structure for being installed in the oil cavity 110 of the shell 100. The upper end cover 220 has an upper end cover opening 221 which communicates with the oil inlet cavity 111. The exhaust structure comprises an exhaust pipe 1 having a first end 11 connected to the upper end cover 220 and a second end 12 extending towards the oil outlet cavity 112. The oil outlet cavity 112, the inner cavity of the exhaust pipe 1, and the upper end cover opening 221 sequentially communicate, so as to balance the pressure of the oil outlet cavity 112 and the oil inlet cavity 111 and reduce the pressure difference.

[0070] With reference back to Figures 1-10 , the exhaust structure further comprises a float ball 2 having a density smaller than that of the oil in the oil outlet cavity 112, so that the float ball 2 can float upwards with the rising of the oil level in the oil outlet cavity 112. The float ball 2 can block the second end 12 to separate the inner cavity of the exhaust pipe 1 from the oil outlet cavity 112, thereby separating the oil outlet cavity 112 and the oil inlet cavity 111 and preventing the dirty oil in the oil inlet cavity 111 from entering the oil outlet cavity 112 through the exhaust pipe 1 and contaminating the oil in the oil outlet cavity 112. In addition, since the second end 12 of the exhaust pipe 1 extends towards the oil outlet cavity 112, the second end 12 can be blocked by the float ball 2 when the liquid level in the oil outlet cavity 112 is low, thereby separating the oil outlet cavity 112 and the oil inlet cavity 111, which can be applicable to the case where the pressure difference between the oil inlet cavity 111 and the oil outlet cavity 112 is large, resulting in a large difference in liquid level between the oil inlet cavity 111 and the oil outlet cavity 112. Optionally, the second end 12 extends in a vertical direction.

[0071] With reference back to Figures 1-10 , the second end 12 is provided with an upper accommodating groove 13, the inner cavity of the exhaust pipe 1 communicates with the upper accommodating groove 13, and the float ball 2 can abut against the groove wall of the upper accommodating groove 13 to separate the inner cavity of the exhaust pipe 1 from the oil outlet cavity 112. The separation of the inner cavity of the exhaust pipe 1 from the oil outlet cavity 112 is achieved by the abutment of the float ball 2 against the groove wall of the upper accommodating groove 13, which has a good sealing effect. Optionally, the groove wall of the upper accommodating groove 13 is in a spherical shape, so that the float ball 2 can completely abut against the groove wall of the upper accommodating groove 13.

[0072] With reference back to Figures 1-10The exhaust structure further comprises a ball seat 3, the ball 2 is capable of moving between the blocking position and the separated position, when the ball 2 is in the blocking position, the ball 2 blocks the second end 12, when the ball 2 is in the separated position, the ball 2 is separated from the second end 12 and can be supported on the ball seat 3, so as to avoid that when the oil liquid level in the oil outlet cavity 112 is low, the ball 2 continues to drop with the change of the oil liquid level.

[0073] With reference to the foregoing Figures 1-10 , the problem of the foregoing structure is that when the oil liquid level in the oil outlet cavity 112 is low, the ball 2 drops to the separated position and is separated from the second end 12, when the ball 2 is directly below the second end 12, the ball 2 can float up to the second end 12 with the rise of the oil liquid level and be attached to the second end 12, but if the ball 2 floats around in the oil outlet cavity 112, the position of the ball 2 will be deviated, and then the ball 2 cannot float up to the vicinity of the second end 12 and cannot complete the blocking. To this end, in the embodiment, the distance between the end of the ball seat 3 and the second end 12 is less than the diameter of the ball 2, so as to avoid that the ball 2 floats around between the ball seat 3 and the second end 12, so that the ball 2 can always be located between the ball seat 3 and the second end 12.

[0074] With reference to the foregoing Figures 1-10 , the ball seat 3 has a lower accommodating groove 31, when the ball 2 is in the separated position, the ball 2 is supported on the groove wall of the lower accommodating groove 31, so as to improve the stability of the support. Optionally, the groove wall of the lower accommodating groove 31 is spherical, so that the ball 2 can be completely attached to the groove wall of the lower accommodating groove 31, and the stability of the support is further improved.

[0075] With reference to the foregoing Figures 1-10 , when the oil liquid level in the oil outlet cavity 112 rises, the oil liquid can be outside the lower accommodating groove 31 and apply buoyancy to the ball 2 at the lower position of the side surface of the ball 2, but obviously, the buoyancy applied to the ball 2 along the side surface is relatively small, and there may be a situation that the ball 2 cannot be smoothly floated up. To this end, the ball seat 3 has a through hole, one end of the through hole is communicated with the lower accommodating groove 31, and the other end is communicated with the oil outlet cavity 112, so that the oil liquid can directly pass through the through hole and apply buoyancy to the ball 2 below the ball 2, so that the ball 2 can be smoothly floated up. Optionally, the ball seat 3 is tubular and extends in the vertical direction, and the through hole is a central hole of the ball seat 3, so as to simplify the overall structure of the ball seat 3.

[0076] With reference to the foregoing Figures 1-10, the exhaust structure further comprises an exhaust passage structure 4 arranged on the upper end cover 220, the exhaust passage structure 4 is located in the oil inlet cavity 111 and has an exhaust passage 41, the upper end cover opening 221 and the oil inlet cavity 111 are communicated through the exhaust passage 41, the exhaust passage structure 4 comprises a base 42 arranged on the upper end cover 220 and an extension piece 43 arranged on the base 42, the extension piece 43 extends in the vertical direction, and the exhaust passage 41 penetrates through the extension piece 43. In this way, the exhaust passage 41 extends upward, so that the oil liquid surface in the oil inlet cavity 111 needs to rise to a higher level to enter the exhaust passage 41, thereby further preventing the oil liquid in the oil inlet cavity 111 from entering the exhaust passage 41. Alternatively, the shell 100 has a groove 120 for accommodating the extension piece 43, the side wall of the groove 120 is arranged in a spaced manner with the outer wall of the extension piece 43, so as to facilitate the gas to pass through.

[0077] With reference to the foregoing Figures 1-10 , the exhaust structure further comprises a base elastic piece 44, one end of the base elastic piece 44 is connected to the shell 100, and the other end of the base elastic piece 44 is connected to the exhaust passage structure 4, the base elastic piece 44 is used to provide an elastic force for abutting the exhaust passage structure 4 against the upper end cover 220, specifically, the base elastic piece 44 is connected to the base 42 of the exhaust passage structure 4, so that the base 42 abuts against the upper end cover 220, thereby improving the sealing performance between the base 42 and the upper end cover 220. In some embodiments, the filter assembly 200 is installed on the lower cavity wall of the oil cavity 110, and the base elastic piece 44 can simultaneously abut the filter assembly 200 against the lower cavity wall of the oil cavity 110.

[0078] With reference to the foregoing Figures 1-10 , the fuel filter of the embodiment comprises the exhaust structure described above, further comprises a shell 100 and a filter assembly 200, the shell 100 has an oil cavity 110, and the exhaust structure is installed in the oil cavity 110; the filter assembly 200 is arranged in the oil cavity 110 and divides the oil cavity 110 into an oil inlet cavity 111 and an oil outlet cavity 112, the filter assembly 200 comprises a filter element 210 and an upper end cover 220, the filter element 210 is configured to allow only oil liquid to pass through, the upper end cover 220 has an upper end cover opening 221, the upper end cover opening 221 is used to communicate the oil inlet cavity 111 and the oil outlet cavity 112, and the exhaust structure is connected to the upper end cover 220. The exhaust structure can communicate the oil outlet cavity 112 and the oil inlet cavity 111 to balance the pressure of the oil outlet cavity 112 and the oil inlet cavity 111, when the oil liquid level of the oil outlet cavity 112 is high, the float ball 2 can float up with the oil liquid level of the oil outlet cavity 112, thereby preventing the dirty oil liquid in the oil inlet cavity 111 from entering the oil outlet cavity 112 through the exhaust pipe 1, and avoiding the oil liquid in the oil outlet cavity 112 from being contaminated.

[0079] With reference to the foregoing Figures 1-10The fuel filter further comprises a drain pipe 400 arranged on the lower cavity wall of the oil outlet cavity 112 and extending towards the oil outlet cavity 112, both ends of the drain pipe 400 are provided with openings, the oil outlet cavity 112, the inner cavity of the drain pipe 400 and the inner cavity of the oil outlet pipe 102 are sequentially communicated, so that the oil in the oil outlet cavity 112 can flow into the oil outlet pipe 102 through the drain pipe 400.

[0080] With reference to the foregoing Figures 1-10 The side wall of the drain pipe 400 is provided with an oil suction hole 410, the oil suction hole 410 communicates the inner cavity of the drain pipe 400 and the oil outlet cavity 112, since both ends of the drain pipe 400 are provided with openings, the oil in the oil outlet cavity 112 can enter the inner cavity of the drain pipe 400 through the opening of the upper end surface of the drain pipe 400, or enter the inner cavity of the drain pipe 400 through the oil suction hole 410. In addition, since the drain pipe 400 extends towards the oil outlet cavity 112, the height of the oil suction hole 410 is lower than the opening height of the upper end surface. When the pressure of the oil outlet cavity 112 decreases, and the oil level in the oil outlet cavity 112 is lower than the opening of the upper end surface of the drain pipe 400, the oil can enter the inner cavity of the drain pipe 400 through the oil suction hole 410, and then smoothly enter the oil outlet pipe 102, so that the engine using the fuel filter can be started smoothly.

[0081] With reference to the foregoing Figures 1-10 It can be understood that with the start of the engine, the oil pump will gradually pump out the air in the oil outlet cavity 112, so that the oil level in the oil outlet cavity 112 rises above the opening of the upper end surface, at this time the oil can be normally sucked into the inner cavity of the drain pipe 400 through the opening of the upper end surface, at this time, if the amount of oil through the oil suction hole 410 is high, it may also lead to a decrease in the utilization rate of the filter element. In this regard, the opening of the one end of the drain pipe 400 extending into the oil outlet cavity 112 has a smaller cross-sectional area than the cross-sectional area of the oil suction hole 410, so as to reduce the flow of oil through the oil suction hole 410 and minimize the influence of the oil suction hole 410 on the utilization rate of the filter element 210 when the oil level in the oil outlet cavity 112 is high.

[0082] With reference to the foregoing Figures 1-10 The drain pipe 400 is provided with a plurality of oil suction holes 410, the plurality of oil suction holes 410 are arranged at intervals along the circumferential direction, so that the oil can flow into the drain pipe 400 in different directions. Alternatively, the sum of the cross-sectional areas of the plurality of oil suction holes 410 is still smaller than the cross-sectional area of the opening of the upper end surface.

[0083] With reference to the foregoing Figures 1-10The fuel filter further comprises a partition plate 300 and an oil inlet pipe 101 arranged on the shell 100. The partition plate 300 is arranged on the shell 100, and the oil cavity 110 is located above the partition plate 300, so that the upper surface of the partition plate 300 constitutes the lower cavity wall of the oil cavity 110. The oil outlet pipe 400 is arranged on the partition plate 300, and the lower surface of the partition plate 300 and the shell 100 form a flow guide cavity 310. The flow guide cavity 310 is provided with a flow guide piece 320, which divides the flow guide cavity 310 into an oil inlet flow guide cavity 311 and an oil outlet flow guide cavity 312. The inner cavity of the oil inlet pipe 101, the oil inlet flow guide cavity 311 and the oil inlet cavity 111 are sequentially communicated, and the inner cavity of the oil outlet pipe 102, the oil outlet flow guide cavity 312, the inner cavity of the oil outlet pipe 400 and the oil outlet cavity 112 are sequentially communicated. Since the filter element 210 is in a cylindrical shape, the oil inlet cavity 111 is located outside the filter element 210, and the oil outlet cavity 112 is located inside the filter element 210. In order to adapt to the positions of the oil inlet cavity 111 and the oil outlet cavity 112, the oil outlet flow guide cavity 312 is located inside the flow guide piece 320, and the oil inlet flow guide cavity 311 is located outside the flow guide piece 320.

[0084] With reference to the foregoing Figures 1-10 , the middle part of the partition plate 300 is provided with a partition plate opening, and the oil outlet flow guide cavity 312 and the oil outlet cavity 112 are communicated through the partition plate opening. Specifically, the middle part of the partition plate 300 is provided with a partition plate opening, and the oil outlet pipe 400 passes through the partition plate opening to communicate the oil outlet flow guide cavity 312 and the oil outlet cavity 112. The oil outlet pipe 400 can be arranged on the flow guide piece 320, and the flow guide piece 320 is sleeved on the oil outlet pipe 400. Optionally, the outer wall of the oil outlet pipe 400 is attached to the inner wall of the flow guide piece 320, so that the oil can only enter the oil outlet flow guide cavity 312 from the oil outlet cavity 112 through the oil outlet pipe 400.

[0085] With reference to the foregoing Figures 1-10 , the side wall of the partition plate 300 is arranged in a spaced manner with the inner wall of the shell 100, so that the oil inlet flow guide cavity 311 and the oil inlet cavity 111 are communicated, and the oil can pass through the gap between the side wall of the partition plate 300 and the inner wall of the shell 100 to enter the oil inlet cavity 111.

[0086] With reference to the foregoing Figures 1-10The flow guide 320 comprises an inner flow guide 321 and an outer flow guide 322 sleeved on the inner flow guide 321, the outer flow guide 322 is connected to the side wall of the opening of the partition plate, the inner flow guide 321 is arranged in a spaced manner with the outer flow guide 322, and an oil passing channel 323 is formed between the inner flow guide 321 and the outer flow guide 322, the shell 100 further has a collection cavity 150 located below the oil passing channel 323, the oil outlet cavity 112, the oil passing channel 323 and the collection cavity 150 are sequentially communicated. The collection cavity 150 can be used for collecting filtered oil, and optionally, a cavity wall of the collection cavity 150 is provided with a drainage port, and a drainage valve 151 is arranged, the drainage valve 151 is used for opening or closing the drainage port.

[0087] With reference to the foregoing Figures 1-10 The upper surface of the partition plate 300 is provided with a containing groove 330, and the lower end of the filter element 210 is installed in the containing groove 330, so that the filter element 210 can be stably installed in the fuel filter.

[0088] With reference to the foregoing Figures 1-10 The fuel filter further comprises a pressure detection pipe 500, a pressure indicating member 510 and a pressure pipe elastic member 520, the pressure detection pipe 500 is made of a light-transmitting material, the inlet pipe 101 and the outlet pipe 102 are respectively connected to two ends of the pressure detection pipe 500, so that the inner cavity of the inlet pipe 101 and the inner cavity of the outlet pipe 102 are simultaneously communicated with the inner cavity of the pressure detection pipe 500. The pressure indicating member 510 is movably arranged in the inner cavity of the pressure detection pipe 500 and can move with the change of oil pressure on both sides, so that when the oil pressure in the inner cavity of the inlet pipe 101 or the inner cavity of the outlet pipe 102 changes, the pressure difference between the inner cavity of the inlet pipe 101 and the inner cavity of the outlet pipe 102 changes, and then the pressure indicating member 510 is driven to move, and the user can judge the change of oil pressure on both sides through the movement of the pressure indicating member 510. Optionally, the pressure indicating member 510 is always attached to the inner wall of the pressure detection pipe 500 to form a seal, so as to prevent oil from passing through, so that the pressure indicating member 510 can move under the action of oil pressure, prevent measurement error caused by oil leakage, and avoid contamination of oil in the outlet pipe 102. In the embodiment, the pressure indicating member 510 is spherical, and in other embodiments, it can also be cylindrical.

[0089] Optionally, one end of the pressure tube elastic member 520 is connected to the inner wall of the pressure detection tube 500, and the other end is connected to the pressure marker 510. After the oil-driven pressure marker 510 moves, the pressure tube elastic member 520 is used to provide an elastic force to reset the pressure marker 510. The change of the pressure difference between the inner cavity of the oil inlet pipe 101 and the inner cavity of the oil outlet pipe 102 will cause the displacement of the pressure marker 510 and the elastic deformation of the pressure tube elastic member 520. The displacement amount of the pressure marker 510 is different, and the elastic force provided by the pressure tube elastic member 520 is different. Therefore, the displacement amount of the pressure marker 510 can be obtained, and the elastic force of the pressure marker 510 at this time can be obtained, and then the pressure difference of the oil on both sides of the pressure marker 510 can be obtained, so as to quantitatively analyze the pressure difference of the oil on both sides of the pressure marker 510.

[0090] With reference to the foregoing description Figures 1-10 , the pressure detection tube 500 comprises a first tube segment 501, a second tube segment 502 and a third tube segment 503 connected in sequence. The first tube segment 501 is connected to the oil inlet pipe 101, and the third tube segment 503 is connected to the oil outlet pipe 102, so that the inner cavities of the oil inlet pipe 101, the first tube segment 501, the second tube segment 502, the third tube segment 503 and the oil outlet pipe 102 are connected in sequence. The second tube segment 502 extends in the horizontal direction, the extension direction of the first tube segment 501 is at an angle to the horizontal direction, and the extension direction of the third tube segment 503 is at an angle to the horizontal direction. The pressure marker 510 is movably arranged in the second tube segment 502, so as to avoid the influence of the gravity of the pressure marker 510 itself on the detection result.

[0091] With reference to the foregoing description Figures 1-10 , the inner wall of one end of the second tube segment 502 close to the first tube segment 501 is provided with a first limiting member 5021, which is used to prevent the pressure marker 510 from entering the first tube segment 501. The inner wall of one end of the second tube segment 502 close to the third tube segment 503 is provided with a second limiting member 5022, which is used to prevent the pressure marker 510 from entering the third tube segment 503. The first limiting member 5021 and the second limiting member 5022 can prevent the pressure marker 510 from leaving the second tube segment 502, so as to avoid excessive movement of the pressure marker 510.

[0092] Optionally, the side wall of the second tube segment 502 is provided with a pressure scale mark, so that the user can directly observe the displacement amount of the pressure marker 510 through the scale mark, and then obtain the pressure difference of the oil on both sides of the pressure marker 510. Preferably, the scale mark is a plurality of parallel and spaced scale lines, at least part of the scale lines are provided with digital marks, and different color scale lines can also be used for marking to facilitate reading.

[0093] With reference to the foregoing description Figures 1-10The pressure tube elastic members 520 are provided with two, and the two pressure tube elastic members 520 are respectively located at the two sides of the pressure indicating member 510, and the two pressure tube elastic members 520 can respectively exert elastic force on the pressure indicating member 510 along the two sides of the pressure indicating member 510. Optionally, the two pressure tube elastic members 520 are both arranged in the second tube section 502, and both extend and contract in the horizontal direction.

[0094] It can be understood that the height of the oil inlet pipe 101 and the oil outlet pipe 102 also affects the pressure difference of the oil on the two sides of the pressure indicating member 510, and thus after obtaining the pressure difference of the oil on the two sides of the pressure indicating member 510, the height difference between the second tube section 502 and the oil inlet pipe 101 and the oil outlet pipe 102 also needs to be considered to obtain the pressure difference of the inner cavities of the oil inlet pipe 101 and the oil outlet pipe 102. Generally, the oil pressure of the oil inlet pipe 101 is greater than that of the oil outlet pipe 102, and thus in order to adapt to this characteristic, the height of the oil inlet pipe 101 is lower than that of the oil outlet pipe 102, so as to keep the oil pressure on the two sides of the pressure indicating member 510 balanced as much as possible. In addition, the height of the oil inlet pipe 101 can also be higher than that of the oil outlet pipe 102, so that the pressure indicating member 510 always has a tendency to move towards the side of the oil outlet pipe 102.

[0095] With reference to Figures 1-10 The fuel filter in the embodiment further comprises a pressure warning device arranged in the oil inlet pipe 101 or the oil outlet pipe 102 of the fuel filter. The pressure warning device comprises a warning device housing 6, a diaphragm 7, an indicating member 8, and a first elastic member 81. The warning device housing 6 has a warning device inner cavity, the diaphragm 7 is arranged in the warning device inner cavity and divides the warning device inner cavity into a first cavity 61 and a second cavity 62, the first cavity 61 can communicate with the inner cavity of the oil inlet pipe 101 or the inner cavity of the oil outlet pipe 102, and the diaphragm 7 can deform in a first direction. The indicating member 8 is arranged in the second cavity 62 and slides in the first direction, and the first elastic member 81 is used to provide elastic force for the sliding of the indicating member 8, so that the indicating member 8 always abuts against the diaphragm 7, thereby exerting elastic force on the diaphragm 7. The pressure of the first cavity 61 is generally greater than that of the second cavity 62, and when the pressure of the first cavity 61 is normal, the sum of the elastic force of the first elastic member 81 and the pressure of the second cavity 62 is balanced with the pressure of the first cavity 61. When the pressure of the first cavity 61 decreases, the force conditions on both ends of the diaphragm 7 change, the first elastic member 81 drives the indicating member 8 to move towards the first cavity 61, so as to balance the forces on both sides of the diaphragm 7. At this time, the position of the indicating member 8 can be used to quantitatively judge the oil pressure of the first cavity 61, so as to judge whether the oil pressure in the inner cavity of the oil inlet pipe 101 or the oil outlet pipe 102 is normal.

[0096] With reference to Figures 1-10The warning device shell 6 comprises a warning device body 63 and an identification structure 64 connected to the warning device body 63, the diaphragm 7 is arranged on the warning device body 63, the first cavity 61 is located on one side of the diaphragm 7, the diaphragm 7, the warning device body 63 and the identification structure 64 jointly form the second cavity 62, the indicating element 8 is slidingly arranged on the identification structure 64, and the identification structure 64 is made of a light-transmitting material, so that the user can directly observe the position of the indicating element 8 through the identification structure 64.

[0097] Continuing to refer to Figures 1-10 The identification structure 64 is provided with scale marks, so that the user can intuitively observe the displacement of the indicating element 8 through the scale marks, and then obtain the oil pressure of the first cavity 61. Preferably, the scale marks are a plurality of scale lines arranged in parallel and at intervals, at least part of the scale lines are provided with numerical marks, and different color scale lines, such as red, yellow and blue, can also be used for identification, so as to facilitate reading and be more eye-catching.

[0098] Continuing to refer to Figures 10 The pressure warning device further comprises a push rod 9 and a second elastic element 91. The push rod 9 is slidingly arranged in the first cavity 61 in the first direction, and the second elastic element 91 is used to provide an elastic force for sliding the push rod 9, so that the push rod 9 always abuts against the diaphragm 7. Specifically, the push rod 9 and the indicating element 8 abut against the diaphragm 7 on two sides thereof respectively. The second elastic element 91 can balance the elastic force of the first elastic element 81, prevent the indicating element 8 from moving excessively, and prevent the diaphragm 7 from deforming excessively. In addition, the user can adjust the elastic force by replacing different first elastic elements 81 or second elastic elements 91, and then adjust the pressure indication range of the pressure warning device, so as to be suitable for different models of fuel filters.

[0099] Continuing to refer to Figures 10 The warning device body 63 has a push rod sliding groove 65 communicating with the first cavity 61, the push rod 9 comprises a push rod sliding block 92 and a baffle 93 arranged on the push rod sliding block 92, the push rod sliding block 92 can slide relative to the push rod sliding groove 65 in the first direction, specifically, part of the push rod sliding block 92 is slidingly arranged in the push rod sliding groove 65, and the other part extends out of the push rod sliding groove 65, the baffle 93 is slidingly arranged in the first cavity 61 in the first direction, the push rod sliding block 92 is attached to the side wall of the push rod sliding groove 65, the side wall of the push rod sliding groove 65 is provided with an interface 66, the interface 66 communicates with the first cavity 61, so that the first cavity 61 communicates with the inner cavities of the oil inlet pipe 101 or the oil outlet pipe 102, and the oil liquid can pass through. In addition, the push rod sliding groove 65 is arranged on the cavity wall of the first cavity 61 away from the indicating element 8, one end of the second elastic element 91 abuts against the baffle 92, and the other end abuts against the cavity wall of the first cavity 61 away from the indicating element 8.

[0100] Continuing to refer to Figures 10, the push rod slider 92 can slide along the first direction to have a closed position and a conducting position, when the push rod slider 92 is located at the closed position, the push rod slider 92 closes the interface 66, so that the inner cavity of the oil inlet pipe 101 is separated from the interface 66, or the inner cavity of the oil outlet pipe 102 is separated from the interface 66, and the oil in the first cavity 61 is prevented from passing through. When the push rod slider 92 is located at the conducting position, the push rod slider 92 opens the interface 66, and the inner cavity of the oil inlet pipe 101 or the inner cavity of the oil outlet pipe 102 is communicated with the interface 66, at this time, the oil can pass through the interface 66 to enter or exit the first cavity 61. It can be understood that when the oil pressure of the oil inlet pipe 101 or the oil outlet pipe 102 decreases, the indicator 8 moves towards the first cavity 61, at this time, the push rod slider 92 moves from the conducting position to the closed position, when the push rod slider 92 is located at the conducting position, the oil can normally pass through the interface 66 to enter or exit the first cavity 61, when the push rod slider 92 is located at the closed position, the push rod slider 92 closes the first cavity 61, preventing the oil from entering or exiting, so that the oil pressure of the first cavity 61 remains unchanged, at this time, the push rod slider 92 is only affected by the pressure difference between the first cavity 61 and the inner cavity of the oil inlet pipe 101 or the oil outlet pipe 102 to move, so only when the oil pressure in the inner cavity of the oil inlet pipe 101 or the oil outlet pipe 102 changes suddenly, the push rod slider 92 will continue to move towards the inner cavity of the oil inlet pipe 101 or the oil outlet pipe 102 after moving to the closed position, at this time, the indicator 8 will also displace to remind the maintenance personnel to overhaul as soon as possible.

[0101] With reference to the foregoing Figures 10 , the baffle 93 can abut against the cavity wall of the first cavity 61 along the first direction and away from the indicator 8, so that the movement of the baffle 93 along the first direction is more stable.

[0102] With reference to the foregoing Figures 10 , the outer wall of the baffle 93 is attached to the cavity wall of the first cavity 61, the baffle 93 is provided with a flow guide hole 94, and the first cavities 61 located at both ends of the baffle 93 are communicated through the flow guide hole 94.

[0103] With reference to the foregoing Figures 10 , the indicator 8 is provided with an abutting portion 82, the abutting portion 82 can abut against one end of the identification structure 64 away from the warning device main body 63, so as to limit the indicator 8, prevent the indicator 8 from dislocating too much, and at the same time, the abutting portion 82 can be used as a marking part of the indicator 8, and the user can judge the position of the indicator 8 according to the position of the abutting portion 82 and the identification structure 64.

[0104] With reference to the foregoing Figures 10 , the embodiment further provides a fuel filter with another exhaust structure, and the exhaust structure of the fuel filter is also used to be installed in the oil cavity 110 of the housing 100 and solves the problem that dirty oil may enter the oil outlet cavity through the exhaust hole due to bumping or tilting of the fuel filter by another technical solution.

[0105] With reference to the foregoing Figures 10 The exhaust structure comprises a gas guide pipe 10 connected to the upper end cover 220 and provided with a sliding groove 14, the inner cavity of the gas guide pipe 10 is communicated with the upper end cover opening 221, and the inner cavity of the gas guide pipe 10 is communicated with the oil outlet cavity 112 through the sliding groove 14, so that the oil outlet cavity 112, the sliding groove 14, the inner cavity of the gas guide pipe 10, the upper end cover opening 221 and the oil inlet cavity 111 are sequentially communicated, so that the oil outlet cavity 112 is communicated with the oil inlet cavity 111, the pressure of the oil outlet cavity 112 and the oil inlet cavity 111 is balanced, and the pressure difference is reduced.

[0106] With reference to the foregoing Figures 10 The extension direction of the sliding groove 14 forms an angle with the horizontal plane; the exhaust structure further comprises a float 5 movably arranged in the inner cavity of the gas guide pipe 10 and slidably matched with the sliding groove 14, the density of the float 5 is less than that of the oil liquid in the oil outlet cavity 112, so that the float 5 can float upwards with the rising of the oil liquid level in the oil outlet cavity 112, and the float 5 can abut against the upper groove wall of the sliding groove 14, so that the inner cavity of the gas guide pipe 10 above the float 5 is separated from the oil outlet cavity 112, thereby preventing the dirty oil in the oil inlet cavity 111 from entering the oil outlet cavity through the gas guide pipe 10 when the oil liquid level in the oil outlet cavity 112 rises, and avoiding the oil liquid in the oil outlet cavity 112 from being contaminated. Optionally, the sliding groove 14 extends along the vertical direction to facilitate the floating of the float 5, and in addition, in order to enhance the stability of the sliding connection between the float 5 and the gas guide pipe 10, the gas guide pipe 10 is provided with two sliding grooves 14, and the float 2 is slidably arranged in the two sliding grooves 14.

[0107] With reference to the foregoing Figures 11-16 The float 5 comprises a sliding member 51 and a blocking member 52, the sliding member 51 is slidably arranged in the sliding groove 14, and the blocking member 52 is always attached to the inner wall of the gas guide pipe 10, the separation of the inner cavity of the gas guide pipe 10 from the oil outlet cavity 112 is realized by the attachment of the blocking member 52 to the inner wall of the gas guide pipe 10, and the blocking effect is good.

[0108] With reference to the foregoing Figures 11-16 The sliding member 51 is further provided with a limiting member 53, the limiting member 53 and the blocking member 52 are respectively located on the two sides of the sliding groove 14, and the limiting member 53 and the blocking member 52 are used to limit the sliding member 51 from disengaging from the sliding groove 14, by arranging the limiting member 53, the position of the float 2 can be limited, so that it can only slide along the extension direction of the sliding groove 14 relative to the gas guide pipe 10, and the float 2 is prevented from disengaging from the sliding groove 14.

[0109] With reference to the foregoing Figures 11-16 The groove width of the sliding groove 14 is less than the width of the blocking member 52 to prevent the blocking member 52 from disengaging from the inner cavity of the gas guide pipe 10, and at the same time, the float 5 is prevented from disengaging from the sliding groove 14.

[0110] With reference to the foregoing Figures 11-16When the float 5 floats to the top end of the chute 14 with the rising of the oil liquid level in the oil outlet cavity 112, the sliding piece 51 needs to be attached to the upper wall of the chute 14 to separate the inner cavity of the air guide pipe 10 above the float 5 from the oil outlet cavity 112. However, only the attachment of the sliding piece 51 to the upper wall of the chute 14 can easily cause liquid leakage. In this embodiment, the upper surface of the blocking piece 52 is higher than the sliding piece 51, so that when the sliding piece 51 is attached to the upper wall of the chute 14, the part of the blocking piece 52 that is higher than the sliding piece 51 can still be attached to the inner wall of the air guide pipe 10 to achieve separation.

[0111] With reference to the foregoing embodiments, Figures 11-16 When the oil liquid level in the oil outlet cavity 112 is low, the float 5 falls below the lower wall of the chute 14, which can separate the inner cavity of the air guide pipe 10 below the float 5 from the oil outlet cavity 112. At this time, with the rising of the oil liquid level in the oil outlet cavity 112, the oil liquid can only exert a buoyant force on the float 5 through the part of the float 5 that protrudes from the chute 14, such as through the limiting piece 53 or part of the sliding piece 51. However, it is obvious that the buoyant force is relatively small at this time, and there can be a situation where the float 5 cannot float smoothly. Therefore, the end of the air guide pipe 10 away from the upper end cover opening 221 is in communication with the oil outlet cavity 112, so that the oil liquid can enter the inner cavity of the air guide pipe 10 from the oil outlet cavity 112 from the end away from the upper end cover opening 221. The oil liquid can directly pass through the through hole to exert a buoyant force on the blocking piece 52 of the float 5 below the float 5, so that the float 5 can float smoothly.

[0112] This embodiment provides another fuel filter, which also includes a shell 100, a filter assembly 200, an oil inlet pipe 101, an oil outlet pipe 102, a partition plate 300, and a flow guide piece 320, and the specific structure has been described in detail in the foregoing, which will not be described again.

[0113] With reference to the foregoing embodiments, Figures 11-16 The shell 100 is at least partially made of light-transmitting material. The side wall of the filter element 210 of the filter assembly 200 is provided with a window 211, the two ends of the window 211 are in communication with the oil inlet cavity 111 and the oil outlet cavity 112, respectively, and the window 211 is provided with a light-transmitting piece 212 that is attached to the side wall of the window 211 to prevent the oil liquid from leaking from the window 211. The user can directly observe the liquid level of the oil inlet cavity 111 and the oil outlet cavity 112 through the shell 100 and the light-transmitting piece 212 to determine whether the pressure difference between the oil inlet cavity 111 and the oil outlet cavity 112 is within the normal range. Optionally, the light-transmitting piece 212 is made of colorless transparent material.

[0114] Optionally, the filter element 210 is in a cylindrical shape, the oil inlet cavity 111 is located outside the filter element 210, and the oil outlet cavity 112 is located inside the filter element 210, so that the user can directly observe the liquid level of the oil inlet cavity 111 through the part of the shell 100 made of light-transmitting material and observe the liquid level of the oil outlet cavity 112 through the light-transmitting piece 212 again. In addition, in order to adapt to this structure, the oil inlet pipe 101 is tangent to the outer wall of the shell 100, and the oil outlet pipe 102 passes through the middle part of the shell 100.

[0115] With reference to the foregoing description of the first embodiment, Figures 11-16 , the window 211 is arranged on the side wall of the filter element 210, and the bottom of the part of the shell 100 made of light-transmitting material is lower than the top of the light-transmitting piece 212, so that the part of the shell 100 made of light-transmitting material overlaps the light-transmitting piece 212 in the vertical direction, facilitating the observation of the user. In this embodiment, the outer end surface of the light-transmitting piece 212 is flush with the outer wall surface of the filter element 210, or the outer end surface of the light-transmitting piece 212 is in a circular arc shape, and the center line of the light-transmitting piece 212 coincides with the axis of the filter element 210. The inner end surface of the light-transmitting piece 212 is flush with the inner wall surface of the filter element 210, or the inner end surface of the light-transmitting piece 212 is in a circular arc shape, and the center line of the light-transmitting piece 212 coincides with the axis of the filter element 210. In this embodiment, the outer end surface and the inner end surface of the light-transmitting piece 212 are both in a circular arc shape.

[0116] With reference to the foregoing description of the first embodiment, Figures 11-16 , the filter element 210 is provided with a plurality of windows 211, the plurality of windows 211 are arranged at intervals along the circumferential direction of the filter element 210, and the light-transmitting piece 212 is provided with a plurality of light-transmitting pieces 212, the plurality of light-transmitting pieces 212 are arranged one by one in the plurality of windows 211, so as to facilitate the observation of the user in different directions.

[0117] Optionally, the lower end surface of the filter element 210 is used to abut against the cavity wall of the oil cavity 110, and the filter assembly further comprises an upper end cover 220 connected to the upper end surface of the filter element 210.

[0118] Optionally, the oil inlet pipe 101 of the fuel filter is located below the oil cavity 110, and the oil outlet pipe 102 is located below the oil cavity 110, so that the oil enters the oil cavity 110 from below and flows out of the oil cavity 110 from below, without interfering with the observation of the oil level.

[0119] Generally, the filter element 210 is in a cylindrical shape, the oil inlet cavity 111 is located outside the filter element 210, and the oil outlet cavity 112 is located inside the filter element 210, so that the user can observe the liquid level of the oil inlet cavity 111 and the oil outlet cavity 112 through the light-transmitting piece 212. However, the problem is that the liquid level of the oil inlet cavity 111 is generally higher than that of the oil outlet cavity 112, and the user is easily disturbed by the oil in the oil inlet cavity 111 when observing the liquid level of the oil outlet cavity 112 located inside the filter element 210.

[0120] To this end, the embodiment provides an alternative solution, as shown in Figure 17 As shown, the oil inlet cavity 111 is located inside the filter element 210 and communicates with the inner cavity of the oil inlet pipe 101, and the oil outlet cavity 112 is located outside the filter element 210 and communicates with the inner cavity of the oil outlet pipe 102. The user can directly observe the liquid level of the oil inlet cavity 111 and the oil outlet cavity 112 through the shell 100, and since the oil outlet cavity 112 with a lower oil level is located outside the filter element 210, the user will not be disturbed when observing the liquid level of the oil outlet cavity 112.

[0121] In addition, the positions of the conventional oil inlet cavity 111 and the oil outlet cavity 112 are exchanged, and the structure of the light-transmitting piece 212 has the overall technical effect. Specifically, the oil outlet cavity 112 located outside the filter element 210 has a lower liquid level, and the oil inlet cavity 111 located inside the filter element 210 has a higher liquid level, that is, the liquid levels on both sides of the light-transmitting piece 212 are different, and the liquid level on the side close to the observer is lower. The user can observe the difference in liquid level on both sides of the light-transmitting piece 212 through the light-transmitting piece 212, and then quantitatively analyze the pressure difference between the oil inlet cavity 111 and the oil outlet cavity 112. Alternatively, the light-transmitting piece 212 is provided with a scale mark, which is specifically a plurality of scale lines arranged in parallel and at intervals along the vertical direction, so as to facilitate reading.

[0122] Continuing to refer to Figure 17 , in order to adapt to the positions of the oil inlet cavity 111 and the oil outlet cavity 112, the oil inlet pipe 101 passes through the middle part of the shell 100, and the oil outlet pipe 102 is tangent to the outer wall of the shell 100.

[0123] Continuing to refer to Figure 17 , the oil inlet pipe 101 is located below the oil cavity 110, and the oil outlet pipe 102 is located below the oil cavity 110, so that the oil enters the oil cavity 110 from below and flows out of the oil cavity 110 from below, without disturbing the observation of the oil level.

[0124] Referring to Figure 18 , in this alternative solution, the oil outlet flow guide cavity 312 is located outside the flow guide 320, and the oil inlet flow guide cavity 311 is located inside the flow guide 320.

[0125] Continuing to refer to Figure 18 , the middle part of the partition plate 300 is provided with a partition plate opening, and the oil inlet flow guide cavity 311 communicates with the oil inlet cavity 111 through the partition plate opening. The side wall of the partition plate 300 is arranged in a spaced manner with the inner wall of the shell 100, so that the oil outlet flow guide cavity 312 communicates with the oil outlet cavity 112, and the positions of the oil inlet flow guide cavity 311 and the oil outlet flow guide cavity 312 are adapted to the positions of the oil inlet cavity 111 and the oil outlet cavity 112.

[0126] In order to adapt to the above structure, the oil inlet cavity 111, the oil passing channel 323 and the collecting cavity 150 are communicated in sequence. In this scheme, the collecting cavity 150 can be used to collect the oil before filtering, and meanwhile, the impurities in the oil can also be discharged into the collecting cavity 150. The user can open the oil discharging valve 151 to discharge the oil in the collecting cavity 150.

[0127] With reference to the above description Figure 18 Figures 18-19 Figures 18-19 Figures 18-19 The shell 100 comprises a base 130 and an upper shell 140 mounted on the base 130, which can be threadedly connected. The upper shell 140 is made of a light-transmitting material, so that the user can observe the inside of the shell 100 in an obliquely upward direction.

[0128] The embodiment also provides a vehicle comprising the fuel filter and having the same technical effects as the fuel filter.

[0129] Obviously, the above embodiments of the present application are merely exemplary and are not intended to limit the embodiments of the present application. Any modification, equivalent replacement and improvement made within the spirit and principle of the present application should be included in the protection scope of the claims of the present application.

Claims

1. A pressure alarm, used to be installed on the fuel inlet pipe (101) or the fuel outlet pipe (102) of the fuel filter; It is characterized in that include: An alarm housing (6) having an alarm inner cavity; A diaphragm (7) is disposed in the inner cavity of the alarm device and divides the inner cavity of the alarm device into a first cavity (61) and a second cavity (62); the first cavity (61) is capable of communicating with the inner cavity of the oil inlet pipe (101) or the inner cavity of the oil outlet pipe (102); and the diaphragm (7) is capable of deforming along a first direction; an indicator (8) slidably disposed in the second cavity (62) along a first direction; a first elastic member (81) for providing an elastic force for sliding the indicator member (8), so that the indicator member (8) is always pressed against the diaphragm (7); The alarm housing (6) comprises an alarm body (63) and an identification structure (64) connected to the alarm body (63); the diaphragm (7) is arranged on the alarm body (63); the indicator (8) is slidably arranged on the identification structure (64); and the identification structure (64) is made of a light-transmitting material; The pressure alarm further comprises: A push rod (9) is slidably disposed in the first cavity (61) along a first direction; a second elastic member (91) for providing an elastic force for sliding the push rod (9) so that the push rod (9) always abuts against the diaphragm (7); The alarm device body (63) has a push rod chute (65) connected to the first cavity (61), the push rod (9) includes a push rod slider (92) and a baffle (93) arranged on the push rod slider (92), the push rod slider (92) can slide along a first direction relative to the push rod chute (65), the baffle (93) is slidably arranged in the first cavity (61) along the first direction, the push rod slider (92) is in contact with the side wall of the push rod chute (65), the side wall of the push rod chute (65) is provided with an interface (66), and the interface (66) is connected to the first cavity (61); The push rod slider (92) can slide along a first direction and has a closed position and a conducting position. When the push rod slider (92) is in the closed position, the push rod slider (92) closes the interface (66) so that the inner cavity of the oil inlet pipe (101) is separated from the interface (66), or the inner cavity of the oil outlet pipe (102) is separated from the interface (66); when the push rod slider (92) is in the conducting position, the push rod slider (92) opens the interface (66), and the inner cavity of the oil inlet pipe (101) or the inner cavity of the oil outlet pipe (102) is communicated with the interface (66).

2. The pressure warning device according to claim 1, characterized in that: The marking structure (64) is provided with a scale mark.

3. The pressure warning device according to claim 1, characterized in that: The outer wall of the baffle (93) is in contact with the cavity wall of the first cavity (61), and the baffle (93) is provided with a guide hole (94), and the first cavity (61) located at both ends of the baffle (93) is connected through the guide hole (94).

4. The pressure warning device according to claim 1, characterized in that: The indicator (8) is provided with an abutment portion (82), and the abutment portion (82) is capable of abutting against an end of the identification structure (64) away from the alarm device body (63).

5. Fuel filter, characterized in that, The invention comprises the pressure alarm device according to any one of claims 1 to 4, and further comprises an oil inlet pipe (101) and an oil outlet pipe (102), wherein the pressure alarm device is arranged on the oil inlet pipe (101) or the oil outlet pipe (102).

6. A vehicle, characterized in that Comprising the fuel filter as claimed in claim 5.

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