A vehicle fuel tank safety valve

Abstract

The present invention belongs to the technical field of safety valves, and specifically relates to a vehicle fuel tank safety valve, a vehicle fuel tank safety valve comprising a fuel tank cap, a cover body is arranged at the top end of the fuel tank cap, a bottom shell is fixed at the bottom end of the fuel tank cap, an exhaust hole is arranged at the bottom end of the bottom shell, a telescopic cavity is arranged inside the bottom shell, the exhaust hole is connected with the inside of the telescopic cavity, a groove body is arranged at the top end of the fuel tank cap, a through hole is arranged in the middle part of the groove body, the through hole of the groove body is connected with the inside of the telescopic cavity, a sealing plate is arranged inside the telescopic cavity; the inner wall of the fuel tank port drives the driving wheel to rotate in the process of twisting the fuel tank cap, so that the brush roller can be rotated, and when the brush roller rotates, the oil brush brushes oil on the surface of the brush roller, and the brush roller drives the sealing plate to rotate at the same time, and the lubricating oil adheres to the outside of the sealing plate, so as to lubricate the outside of the sealing plate, and prevent the lubricating oil on the outside of the sealing plate from being worn out after being consumed, thereby affecting the normal use of the safety valve.

Description

Technical Field

[0001] The invention belongs to the technical field of safety valves, in particular to a vehicle fuel tank safety valve. Background Art

[0002] A car is a frequently used means of transportation. The fuel tank of a car is used to store gasoline. When the temperature rises, the temperature inside the tank rises, causing the pressure inside the tank to increase. At this time, excessive pressure can easily cause problems such as deformation of the tank. Therefore, it is necessary to automatically release the pressure through a safety valve. The safety valve is usually installed on the tank cap.

[0003] The prior art also proposes some solutions for safety valves. For example, a patent application with publication number CN115264136A discloses a safety valve for an automobile fuel tank, which blocks the top cone through an upper resistance mechanism.

[0004] The above technical solution will discharge the high-pressure gas inside the fuel tank to the outside when in use. During use, the lubricating oil between the internal parts will be consumed. After the lubricating oil is consumed, the friction between the parts will cause surface wear, which may cause the safety valve to malfunction during use and fail to release pressure in time. In addition, gasoline will be consumed when the car is used. If the pressure inside the fuel tank cannot be balanced in time, the fuel tank will not be able to discharge oil, thereby affecting the normal driving of the car.

[0005] To this end, the present invention provides a vehicle fuel tank safety valve. Summary of the invention

[0006] In order to make up for the deficiencies of the prior art, at least one technical problem raised in the background technology is solved.

[0007] The technical solution adopted by the present invention to solve its technical problem is: a vehicle fuel tank safety valve described in the present invention comprises a fuel tank cap, a cover body is arranged at the top end of the fuel tank cap, a bottom shell is fixed to the bottom end of the fuel tank cap, an exhaust hole is arranged at the bottom end of the bottom shell, a telescopic cavity is arranged inside the bottom shell, the exhaust hole is connected with the inside of the telescopic cavity, a groove body is arranged at the top end of the fuel tank cap, a through hole is arranged in the middle part of the groove body, the through hole of the groove body is connected with the inside of the telescopic cavity, a sealing plate is arranged inside the telescopic cavity, a guide column is fixed to the bottom end of the sealing plate, a second sealing spring is sleeved on the outside of the guide column, the top end of the second sealing spring is connected with the sealing plate The bottom end of the second sealing spring is fixedly connected, a swivel is fixed to the bottom end of the second sealing spring, a sealing ball is arranged at the top end of the sealing plate, a sealing groove matching the sealing ball is opened inside the sealing plate, a pull rod is fixed to the bottom end of the sealing ball, a second fixed plate is fixed to the bottom end of the pull rod, a first sealing spring is sleeved on the outside of the pull rod, the top end of the first sealing spring is fixedly connected to the bottom end of the sealing plate, the bottom end of the first sealing spring is fixedly connected to the second fixed plate, U-shaped holes are opened at both ends of the telescopic cavity, lubrication structures for oiling the sealing plate are arranged on both sides of the sealing plate, and a switch structure for opening and closing the cover body is arranged inside the cover body.

[0008] Preferably, the lubrication structure comprises oil chambers arranged on both sides of the inside of the oil tank cover, an oil guide hole is opened below the oil chamber, and an oil guide cotton core is inserted into the oil guide hole.

[0009] Preferably, brush rollers are provided on both sides of the sealing plate, and the brush rollers are rotatably connected to the inside of the bottom shell. An oil brush is fixed to the side of the oil-conducting cotton core close to the brush roller, and the oil brush is close to the outside of the brush roller. A transmission wheel is provided below the brush roller, and the transmission wheel is rotatably connected to the inside of the bottom shell. A first gear is fixed to the bottom end of the brush roller, and a second gear is fixed to the top end of the transmission wheel. The first gear is meshingly connected to the second gear, and a rubber layer is fixed to the outside of the transmission wheel.

[0010] Preferably, a plurality of rollers are arranged at equal intervals below the rotating ring, and the rollers are rotatably connected to the rotating ring.

[0011] Preferably, the switch structure includes a flip block fixed at one end of the bottom end of the cover body, a rotating shaft is fixed on both sides of the flip block, a coil spring is fixed on the outside of the rotating shaft, a flip groove is opened at the top of the fuel tank cover, and the flip block forms a flip structure inside the flip groove, and rotating holes matching the outer diameter of the coil spring are opened on both sides of the inside of the flip groove, and the outer side of the coil spring is fixedly connected to the inner side wall of the rotating hole, a clamping block is fixed on the end of the bottom end of the cover body away from the flip block, a clamping groove is opened inside the flip block, and a fixing groove is opened at the end of the top end of the fuel tank cover away from the flip groove, an active cavity is arranged below the fixed groove, a first spring is fixed on one end inside the active cavity, a movable frame is arranged inside the active cavity, the movable frame is fixedly connected to one end of the first spring, and an insert block is fixed on the end of the movable frame away from the first spring, and a clamping structure is formed between the insert block and the clamping groove.

[0012] Preferably, a push rod is fixed to the bottom end of the movable frame, and one end of the push rod away from the movable frame extends to the inside of the trough body, a lifting frame is fixed to the bottom end of the second fixed plate, a push column is fixed to the top of the lifting frame, and a guide slope is fixed to the top of the push column, one end of the push rod away from the movable frame is pressed against the lifting frame, and a lifting cavity for the movement of the lifting frame is opened at one end of the telescopic cavity.

[0013] Preferably, a first pull rope runs through the interior of the first spring, one end of the first pull rope is fixedly connected to the movable frame, one end of the first pull rope away from the movable frame extends to the outside of the fuel tank cap, and a movable hole matching the first pull rope is opened inside the fuel tank cap.

[0014] Preferably, a push block passes through the inside of the cover body, a tooth plate is fixed on the side of the push block close to the lifting frame, two winding gears are meshed and connected above the tooth plate, a winding column is fixed between the winding gears, a second pull rope is wrapped around the outside of the winding column, the bottom end of the second pull rope is fixedly connected to the top of the push column, the two ends of the winding gear are rotatably connected to the inside of the cover body through a connecting block, and guide grooves are provided at the top and bottom of the push block.

[0015] Preferably, a first fixed plate is provided below the tooth plate, one end of the first fixed plate is fixedly connected to the cover body, a return spring is fixed between the push block and the first fixed plate, a guide rod passes through the interior of the return spring, one end of the guide rod is fixed to the first fixed plate, and the other end of the guide rod is inserted into the interior of the push block.

[0016] Preferably, a filter element is arranged inside the tank body, and four clamping plates are arranged at equal intervals outside the filter element, and the bottom end of the clamping plate is fixedly connected to the fuel tank cover.

[0017] The beneficial effects of the present invention are as follows:

[0018] 1. A vehicle fuel tank safety valve described in the present invention can rotate a brush roller by driving a driving wheel to rotate via the inner wall of the fuel tank opening when the fuel tank cap is twisted. When the brush roller rotates, the oil brush brushes oil on the surface of the brush roller. The brush roller simultaneously drives a sealing plate to rotate and adheres the lubricating oil to the outside of the sealing plate, thereby lubricating the outside of the sealing plate to prevent the lubricating oil on the outside of the sealing plate from being worn out and affecting the normal use of the safety valve.

[0019] 2. The vehicle fuel tank safety valve described in the present invention can be opened during the air intake and exhaust process through the automatic opening and closing of the cover body, and closed when not in use, thereby preventing dust from entering the interior of the fuel tank cover. Pressing the push block before opening the fuel tank cover can allow air to enter the fuel tank, balance the pressure inside and outside the fuel tank, and reduce the resistance to opening the fuel tank cover. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] The present invention will be further described below in conjunction with the accompanying drawings.

[0021] Figure 1 is a stereogram of the present invention;

[0022] Figure 2 It is another perspective stereogram of the present invention;

[0023] Figure 3 is a cross-sectional view of the present invention;

[0024] Figure 4 It is a schematic diagram of the internal structure of the sealing plate in the present invention;

[0025] Figure 5 It is a schematic diagram of the brush roller structure of the present invention;

[0026] Figure 6 It is a schematic diagram of the cover structure in the present invention;

[0027] Figure 7 It is a schematic diagram of the structure of the fuel tank cover in the present invention;

[0028] Figure 8 It is a schematic diagram of the lifting frame structure of the present invention;

[0029] Fig. 9 The present invention Figure 3 Schematic diagram of the local structure at A in the middle;

[0030] Fig.10 It is a schematic diagram of the push block structure in the present invention.

[0031] In the figure: 1, fuel tank cover; 11, turning groove; 12, fixed groove; 121, plug block; 122, moving frame; 123, first spring; 124, push rod; 125, movable chamber; 13, first pull rope; 14, lifting frame; 141, push column; 142, guide slope; 15, trough body; 2, cover body; 21, turning block; 211, rotating shaft; 212, winding spring; 22, clamping block; 221, clamping groove; 23, pushing block; 231, tooth plate; 232, winding gear; 233, winding column; 234, second pull rope; 235, first fixed plate; 236. reset spring; 3. bottom shell; 31. exhaust hole; 32. telescopic chamber; 33. sealing ball; 331. pull rod; 332. second fixing plate; 333. first sealing spring; 34. U-shaped hole; 35. sealing plate; 351. guide column; 352. second sealing spring; 353. swivel; 354. roller; 355. sealing groove; 36. lifting chamber; 4. oil chamber; 41. oil guide cotton core; 411. oil brush; 42. brush roller; 421. first gear; 43. transmission wheel; 431. second gear; 5. filter element; 51. card plate. DETAILED DESCRIPTION

[0032] In order to make the technical means, creative features, objectives and effects achieved by the present invention easy to understand, the present invention is further explained below in conjunction with specific implementation methods.

[0033] like Figures 1 to 4 As shown, a vehicle fuel tank safety valve according to an embodiment of the present invention comprises a fuel tank cap 1, a cover body 2 is arranged at the top of the fuel tank cap 1, a bottom shell 3 is fixed to the bottom end of the fuel tank cap 1, an exhaust hole 31 is arranged at the bottom end of the bottom shell 3, a telescopic chamber 32 is arranged inside the bottom shell 3, the exhaust hole 31 is communicated with the inside of the telescopic chamber 32, a groove body 15 is arranged at the top of the fuel tank cap 1, a through hole is arranged in the middle of the groove body 15, the through hole of the groove body 15 is communicated with the inside of the telescopic chamber 32, a sealing plate 35 is arranged inside the telescopic chamber 32, a guide column 351 is fixed to the bottom end of the sealing plate 35, a second sealing spring 352 is sleeved on the outside of the guide column 351, the top end of the second sealing spring 352 is fixedly connected to the bottom end of the sealing plate 35, and the second sealing spring 352 is connected to the bottom end of the sealing plate 35. A swivel 353 is fixed to the bottom end of the spring 352, a sealing ball 33 is provided at the top end of the sealing plate 35, a sealing groove 355 matching the sealing ball 33 is provided inside the sealing plate 35, a pull rod 331 is fixed to the bottom end of the sealing ball 33, a second fixing plate 332 is fixed to the bottom end of the pull rod 331, a first sealing spring 333 is sleeved on the outside of the pull rod 331, the top end of the first sealing spring 333 is fixedly connected to the bottom end of the sealing plate 35, the bottom end of the first sealing spring 333 is fixedly connected to the second fixing plate 332, U-shaped holes 34 are provided at both ends of the telescopic cavity 32, lubrication structures for oiling the sealing plate 35 are provided on both sides of the sealing plate 35, and a switch structure for opening and closing the cover body 2 is provided inside the cover body 2;

[0034] When the vehicle is in use, the fuel tank will be filled with gasoline. When the ambient temperature rises, the gasoline will expand. At this time, the pressure inside the fuel tank increases. The fuel tank cap 1 is covered on the fuel tank opening of the vehicle, and the bottom shell 3 is fixed inside the fuel tank opening. The increased pressure inside the fuel tank will push the gas. The gas enters the telescopic cavity 32 through the exhaust hole 31. At this time, the gas pushes the sealing ball 33, and the sealing ball 33 pulls the pull rod 331 to drive the second fixed plate 332. The second fixed plate 332 pushes the first sealing spring 333. When the air pressure is greater than the elastic force of the first sealing spring 333, the first sealing spring 333 is compressed. At this time, the sealing ball 33 moves to the top of the sealing groove 355, and a gap is generated between the sealing ball 33 and the sealing groove 355. , the gas is discharged into the interior of the fuel tank cover 1 through the gap, and the gas can be discharged by opening the cover body 2 through the switch structure, and then the first sealing spring 333 drives the sealing ball 33 to reset. During use, the gasoline inside the fuel tank is consumed, and at this time, a negative pressure is generated inside the fuel tank. The negative pressure makes it impossible to extract the gasoline, so it is necessary to automatically replenish the gas inside the fuel tank. When the internal pressure of the fuel tank is negative, the air inside the telescopic chamber 32 will be sucked out through the exhaust hole 31, and then the sealing plate 35 will be driven downward to squeeze the second sealing spring 352. At this time, the downward movement of the sealing plate 35 will cause the U-shaped hole 34 to communicate with the space above the sealing plate 35, and the external air will be introduced into the telescopic chamber 32 through the U-shaped hole 34. At this time, the air pressure inside the fuel tank is in a stable state.

[0035] like Figures 3 to 5 As shown, the lubrication structure includes oil chambers 4 arranged on both sides of the inside of the oil tank cover 1, an oil guide hole is opened below the oil chamber 4, and an oil guide cotton core 41 is inserted into the oil guide hole;

[0036] During use, the oil chamber 4 is filled with lubricating oil, which can lubricate the outside of the sealing plate 35 through the oil guide hole. The oil guide cotton core 41 is inserted into the oil guide hole to slow down the speed of the lubricating oil flowing out.

[0037] like Figures 3 to 5 As shown, brush rollers 42 are arranged on both sides of the sealing plate 35, and the brush rollers 42 are rotatably connected to the inside of the bottom shell 3. An oil brush 411 is fixed to the side of the oil guide cotton core 41 close to the brush roller 42, and the oil brush 411 is close to the outside of the brush roller 42. A transmission wheel 43 is arranged below the brush roller 42, and the transmission wheel 43 is rotatably connected to the inside of the bottom shell 3. A first gear 421 is fixed to the bottom end of the brush roller 42, and a second gear 431 is fixed to the top end of the transmission wheel 43. The first gear 421 is meshed with the second gear 431, and a rubber layer is fixed to the outside of the transmission wheel 43.

[0038] When the fuel tank cap 1 is unscrewed from the fuel tank opening, the transmission wheel 43 will contact the side wall of the fuel tank, and during the twisting process, the transmission wheel 43 will be driven to rotate through the inner wall of the fuel tank opening, and the transmission wheel 43 will drive the second gear 431 to rotate, and the second gear 431 will drive the first gear 421 to rotate, and the first gear 421 can drive the brush roller 42 to rotate. When the brush roller 42 rotates, the oil brush 411 on one side of the oil guide cotton core 41 will brush its outside, and the oil brush 411 can evenly brush the lubricating oil on the outside of the brush roller 42, and then the rotation of the brush roller 42 will drive the sealing plate 35 to rotate synchronously. At this time, the brush roller 42 will apply the lubricating oil on its surface to the outside of the sealing plate 35, and when the fuel tank cap 1 is installed back to the fuel tank opening, the brush roller 42 will be driven to apply lubricating oil to the sealing plate 35 in the opposite direction, so that the sealing plate 35 can be evenly lubricated while the fuel tank cap 1 is unscrewed and installed, so as to prevent the sealing plate 35 from being worn out during use and shortening its service life.

[0039] like Figure 3 to Figure 4 As shown, a plurality of rollers 354 are arranged at equal intervals below the rotating ring 353, and the rollers 354 are rotatably connected to the rotating ring 353;

[0040] When the sealing plate 35 is driven, the second sealing spring 352 and the rotating ring 353 are driven to rotate. At this time, the rotating ring 353 rotates inside the telescopic cavity 32 through the roller 354, so as to reduce the resistance of the sealing plate 35 to rotation.

[0041] like Figures 2 to 9 As shown, the switch structure includes a flip block 21 fixed to one end of the bottom of the cover body 2, a rotating shaft 211 is fixed on both sides of the flip block 21, a coil spring 212 is fixed on the outside of the rotating shaft 211, a flip groove 11 is opened at the top of the fuel tank cover 1, the flip block 21 forms a flip structure inside the flip groove 11, and rotating holes matching the outer diameter of the coil spring 212 are opened on both sides of the inside of the flip groove 11, the outer side of the coil spring 212 is fixedly connected to the inner side wall of the rotating hole, a clamping block 22 is fixed on the end of the bottom of the cover body 2 away from the flip block 21, and the flip structure is formed in the flip groove 11. A card slot 221 is provided inside the rotating block 21, a fixed slot 12 is provided at one end of the top of the fuel tank cover 1 away from the flip slot 11, a movable cavity 125 is provided below the fixed slot 12, a first spring 123 is fixed at one end inside the movable cavity 125, a moving frame 122 is provided inside the movable cavity 125, the moving frame 122 is fixedly connected to one end of the first spring 123, an inserting block 121 is fixed at one end of the moving frame 122 away from the first spring 123, and a clamping structure is formed between the inserting block 121 and the card slot 221;

[0042] During use, the elastic force of the coil spring 212 drives the rotating shaft 211 to rotate, and the rotating shaft 211 drives the flip block 21 to flip inside the flip groove 11. At this time, the flip block 21 drives the cover body 2 to flip in the direction away from the fuel tank cover 1. When the cover body 2 and the fuel tank cover 1 need to be fitted together, the cover body 2 is pressed to drive the clamping block 22 to be clamped into the inside of the fixed groove 12. After being clamped, the elastic force of the first spring 123 pushes the moving frame 122, and the moving frame 122 drives the inserting block 121 to be clamped into the inside of the clamping groove 221, so that the clamping block 22 can be fixed inside the fixed groove 12. The cover body 2 can seal the top of the fuel tank cover 1 to prevent dust from entering the inside of the fuel tank cover 1 during use, causing the internal structure to be affected and unable to be used, and at the same time prevent dust from entering the fuel tank.

[0043] like Figures 2 to 9 As shown, a push rod 124 is fixed to the bottom end of the mobile frame 122, and one end of the push rod 124 away from the mobile frame 122 extends to the inside of the slot body 15, and a lifting frame 14 is fixed to the bottom end of the second fixed plate 332, and a push column 141 is fixed to the top end of the lifting frame 14, and a guide slope 142 is fixed to the top end of the push column 141, and one end of the push rod 124 away from the mobile frame 122 is close to the lifting frame 14, and a lifting chamber 36 for the movement of the lifting frame 14 is opened at one end of the telescopic chamber 32;

[0044] When the internal pressure of the oil tank is high, the sealing ball 33 will be pushed by the air pressure. At this time, the second fixed plate 332 drives the lifting frame 14 to move upward, and the lifting frame 14 drives the push column 141 and the guide slope 142 to move upward. The guide slope 142 can push one end of the push rod 124 through the slope, and then the push column 141 supports the push rod 124. After the push rod 124 is pushed, it drives the moving frame 122 to move. At this time, the moving frame 122 drives the insertion block 121 to separate from the card slot 221. At this time, the card block 22 loses its fixation with the fixed slot 12, and the cover body 2 can be opened. The gas is discharged to the outside through the gap. After the exhaust, the lifting frame 14 is reset. When the sealing plate 35 moves downward, it will drive the lifting frame 14 to move downward. At this time, the upper push column 141 and the guide slope 142 move downward, and can also push the push rod 124 to move so that the cover body 2 can be opened.

[0045] like Figures 2 to 9 As shown, the first spring 123 is penetrated by the first pull rope 13, one end of the first pull rope 13 is fixedly connected to the mobile frame 122, and the end of the first pull rope 13 away from the mobile frame 122 extends to the outside of the fuel tank cover 1, and the fuel tank cover 1 is provided with a movable hole matching the first pull rope 13;

[0046] When the cover body 2 needs to be opened alone, the first pull rope 13 is pulled to release the fixing block 22 from the fixing slot 12 , and the cover body 2 can be flipped open.

[0047] like Figures 2 to 10As shown, a push block 23 is passed through the interior of the cover body 2, and a tooth plate 231 is fixed on one side of the push block 23 close to the lifting frame 14, and two winding gears 232 are meshed and connected above the tooth plate 231, and a winding column 233 is fixed between the winding gears 232, and a second pull rope 234 is wound around the outside of the winding column 233, and the bottom end of the second pull rope 234 is fixedly connected to the top of the push column 141, and the two ends of the winding gear 232 are rotatably connected to the interior of the cover body 2 through a connecting block, and a guide groove is provided at the top and bottom of the push block 23;

[0048] During the ascending process of the lifting frame 14, the second pull rope 234 will become loose, and the cover body 2 can be flipped over at this time. When the lifting frame 14 is reset, the cover body 2 is pulled to flip and reset by the second pull rope 234. Before removing the fuel tank cover 1, in order to balance the pressure inside and outside the fuel tank, it is necessary to ventilate the inside of the fuel tank. At this time, the push block 23 is pressed, and the push block 23 drives the tooth plate 231 to move, and the tooth plate 231 drives the winding gear 232 to rotate, and the winding gear 232 drives the winding column 233 to wind up the second pull rope 234. At this time, the lifting frame 14 can be lifted, and at the same time, the sealing ball 33 can be separated from the sealing groove 355 to form a gap. At the same time, the guide groove of the push block 23 is connected with the inside of the cover body 2, and air can enter the fuel tank at this time.

[0049] like Figures 2 to 10 As shown, a first fixing plate 235 is provided below the tooth plate 231, one end of the first fixing plate 235 is fixedly connected to the cover body 2, a return spring 236 is fixed between the push block 23 and the first fixing plate 235, a guide rod is passed through the interior of the return spring 236, one end of the guide rod is fixed to the first fixing plate 235, and the other end of the guide rod is inserted into the interior of the push block 23;

[0050] After the push block 23 is released, the reset spring 236 will push the push block 23 to reset automatically. At this time, the push block 23 pulls the tooth plate 231 to drive the winding gear 232 to rotate in the opposite direction, so that the second pull rope 234 can be tightened.

[0051] like Figures 3 to 7 As shown, a filter element 5 is disposed inside the tank body 15, and four clamping plates 51 are disposed at equal intervals outside the filter element 5, and the bottom end of the clamping plate 51 is fixedly connected to the fuel tank cover 1;

[0052] When air is taken into the fuel tank cover 1 , the filter element 5 can filter the air to prevent external dust from entering the fuel tank cover 1 . The filter element 5 can be replaced by opening the cover body 2 , and the clamping plate 51 can limit the position of the filter element 5 .

[0053] The above shows and describes the basic principles, main features and advantages of the present invention. It should be understood by those skilled in the art that the present invention is not limited to the above embodiments. The above embodiments and descriptions are only for explaining the principles of the present invention. Without departing from the spirit and scope of the present invention, the present invention may have various changes and improvements, which fall within the scope of the present invention. The scope of protection of the present invention is defined by the attached claims and their equivalents.

Claims

1. A vehicle fuel tank safety valve, characterized in that: The invention comprises a fuel tank cover (1), wherein a cover body (2) is arranged at the top end of the fuel tank cover (1), a bottom shell (3) is fixed at the bottom end of the fuel tank cover (1), an exhaust hole (31) is arranged at the bottom end of the bottom shell (3), a telescopic cavity (32) is arranged inside the bottom shell (3), the exhaust hole (31) and the inside of the telescopic cavity (32) are connected, a groove body (15) is arranged at the top end of the fuel tank cover (1), a through hole is arranged in the middle part of the groove body (15), the through hole of the groove body (15) is connected with the inside of the telescopic cavity (32), a sealing plate (35) is arranged inside the telescopic cavity (32), a guide column (351) is fixed at the bottom end of the sealing plate (35), a second sealing spring (352) is sleeved on the outside of the guide column (351), the top end of the second sealing spring (352) is fixedly connected to the bottom end of the sealing plate (35), the second sealing spring (352) is provided with a sealing plate (351 ... A rotating ring (353) is fixed at the bottom end, a sealing ball (33) is arranged at the top end of the sealing plate (35), a sealing groove (355) matching the sealing ball (33) is provided inside the sealing plate (35), a pull rod (331) is fixed at the bottom end of the sealing ball (33), a second fixed plate (332) is fixed at the bottom end of the pull rod (331), a first sealing spring (333) is sleeved on the outside of the pull rod (331), the top end of the first sealing spring (333) is fixedly connected to the bottom end of the sealing plate (35), the bottom end of the first sealing spring (333) is fixedly connected to the second fixed plate (332), U-shaped holes (34) are provided at both ends of the telescopic cavity (32), lubrication structures for oiling the sealing plate (35) are provided on both sides of the sealing plate (35), and a switch structure for opening and closing the cover body (2) is provided inside the cover body (2); The lubrication structure comprises oil chambers (4) arranged on both sides of the inside of the oil tank cover (1), an oil guide hole is opened below the oil chamber (4), and an oil guide cotton core (41) is inserted into the inside of the oil guide hole; Brush rollers (42) are provided on both sides of the sealing plate (35), and the brush rollers (42) are rotatably connected to the inside of the bottom shell (3). An oil brush (411) is fixed to the side of the oil-conducting cotton core (41) close to the brush roller (42), and the oil brush (411) is closely attached to the outside of the brush roller (42). A transmission wheel (43) is provided below the brush roller (42), and the transmission wheel (43) is rotatably connected to the inside of the bottom shell (3). A first gear (421) is fixed to the bottom end of the brush roller (42), and a second gear (431) is fixed to the top end of the transmission wheel (43), and the first gear (421) and the second gear (431) are meshingly connected. A rubber layer is fixed to the outside of the transmission wheel (43).

2. A vehicle fuel tank safety valve according to claim 1, characterized in that: A plurality of rollers (354) are arranged at equal intervals below the rotating ring (353), and the rollers (354) are rotatably connected to the rotating ring (353).

3. A vehicle fuel tank safety valve according to claim 2, characterized in that: The switch structure comprises a flip block (21) fixed to one end of the bottom of the cover body (2), a rotating shaft (211) being fixed on both sides of the flip block (21), a coil spring (212) being fixed on the outside of the rotating shaft (211), a flip groove (11) being provided at the top of the fuel tank cover (1), the flip block (21) forming a flip structure inside the flip groove (11), rotating holes matching the outer diameter of the coil spring (212) being provided on both sides of the inside of the flip groove (11), the outer side of the coil spring (212) being fixedly connected to the inner side wall of the rotating hole, a clamping block (22) being fixed on the end of the bottom of the cover body (2) away from the flip block (21), the flip A clamping groove (221) is provided inside the block (21); a fixing groove (12) is provided at one end of the top of the fuel tank cover (1) away from the flip groove (11); a movable cavity (125) is provided below the fixing groove (12); a first spring (123) is fixed to one end inside the movable cavity (125); a moving frame (122) is provided inside the movable cavity (125); the moving frame (122) is fixedly connected to one end of the first spring (123); an inserting block (121) is fixed to one end of the movable frame (122) away from the first spring (123); a clamping structure is formed between the inserting block (121) and the clamping groove (221).

4. A vehicle fuel tank safety valve according to claim 3, characterized in that: A push rod (124) is fixed to the bottom end of the movable frame (122), and one end of the push rod (124) away from the movable frame (122) extends into the interior of the trough body (15); a lifting frame (14) is fixed to the bottom end of the second fixed plate (332), a push column (141) is fixed to the top end of the lifting frame (14), and a guide slope (142) is fixed to the top end of the push column (141); one end of the push rod (124) away from the movable frame (122) is in close contact with the lifting frame (14), and a lifting chamber (36) for the movement of the lifting frame (14) is provided at one end of the telescopic chamber (32).

5. A vehicle fuel tank safety valve according to claim 4, characterized in that: A first pull rope (13) runs through the interior of the first spring (123); one end of the first pull rope (13) is fixedly connected to the movable frame (122); one end of the first pull rope (13) away from the movable frame (122) extends to the outside of the fuel tank cover (1); and a movable hole matching the first pull rope (13) is provided inside the fuel tank cover (1).

6. A vehicle fuel tank safety valve according to claim 5, characterized in that: A push block (23) passes through the interior of the cover body (2), a tooth plate (231) is fixed to one side of the push block (23) close to the lifting frame (14), two winding gears (232) are meshedly connected above the tooth plate (231), a winding column (233) is fixed between the winding gears (232), a second pull rope (234) is wound around the outside of the winding column (233), the bottom end of the second pull rope (234) is fixedly connected to the top of the push column (141), the two ends of the winding gear (232) are rotatably connected to the interior of the cover body (2) through a connecting block, and guide grooves are provided at the top and bottom of the push block (23).

7. A vehicle fuel tank safety valve according to claim 6, characterized in that: A first fixing plate (235) is provided below the tooth plate (231), one end of the first fixing plate (235) is fixedly connected to the cover body (2), a return spring (236) is fixed between the push block (23) and the first fixing plate (235), a guide rod passes through the interior of the return spring (236), one end of the guide rod is fixed to the first fixing plate (235), and the other end of the guide rod is inserted into the interior of the push block (23).

8. A vehicle fuel tank safety valve according to claim 7, characterized in that: A filter element (5) is arranged inside the tank body (15), and four clamping plates (51) are arranged at equal intervals outside the filter element (5), and the bottom ends of the clamping plates (51) are fixedly connected to the fuel tank cover (1).

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