A gasoline engine

Abstract

The present application relates to a gasoline engine, which includes a frame, an engine and a fuel tank. A fuel filling port is provided on the fuel tank, and an end cover is threadedly connected to the fuel tank. A fixing ring is provided on the fuel tank, and a receiving cavity is provided inside the fixing ring. A plurality of air outlets are circumferentially provided on the fixing ring, and a through hole is further provided on the outer side wall of the fixing ring. An elastic membrane is provided on the fixing ring, and a connecting block is provided on the elastic membrane. When refueling is required, the end cover is rotated to move the end cover away from the fuel tank, driving the elastic membrane to deform, so that the air around the fixing ring is sucked into the receiving cavity. Until the end cover is separated from the fuel tank, the elastic membrane resets, and the gas sucked into the receiving cavity is discharged from the air outlet, thereby blowing away the dust around the fuel filling port, reducing the dust accumulated on the upper end of the fuel tank, and keeping the dust remaining on the upper end face of the fuel tank away from the fuel filling port, reducing the dust from falling into the airflow range generated by the flowing oil during refueling, thereby reducing the situation of bringing dust into the fuel tank during refueling, which is beneficial to improving the quality of the oil in the fuel tank.

Description

Technical Field

[0001] This application relates to the field of generators, and particularly to a gasoline engine. Background Art

[0002] A gasoline engine, also known as a gasoline generator, is an engine that uses gasoline as fuel to convert internal energy into kinetic energy. Its conversion process is actually the process of the working cycle. Simply put, by burning the fuel in the cylinder, kinetic energy is generated to drive the piston in the engine cylinder to reciprocate. This drives the connecting rod attached to the piston and the crank connected to the connecting rod to perform reciprocating circular motion around the center of the crankshaft, and then output power.

[0003] For example, the Chinese invention patent with the patent publication number CN114658959A discloses a high-efficiency, energy-saving and low-noise gasoline generator, which includes a frame, a fuel tank, an injector and an engine. The engine is installed on the frame, the fuel tank is fixed at the top of the frame and above the engine. The top of the fuel tank is provided with a fuel filling port. The fuel tank is connected to the engine through the injector. It also includes a rotation limiting device. A plurality of traveling wheels are rotatably connected to the frame, and the plurality of traveling wheels support the frame on the ground. The rotation limiting device is used to limit the rotation of the traveling wheels. The operator can drive the traveling wheels to rotate by pushing the frame to move, which is convenient for the operator to move the gasoline generator. When the gasoline generator is working, in order to prevent the position movement of the gasoline generator caused by the vibration of the gasoline generator, the rotation of the traveling wheels can be limited by the rotation limiting device.

[0004] When using the above gasoline generator, after long-term use, dust will accumulate on the upper end face of the fuel tank. When pouring oil into the fuel tank, due to the small mass of the dust, the flowing oil drives the surrounding air flow, and it is easy to bring the dust into the fuel tank, affecting the quality of the oil. After long-term operation, due to the friction of the dust particles, the service life of the internal parts of the gasoline generator will be shortened, which needs to be improved. Summary of the Invention

[0005] In order to improve the problem that dust is easily brought into the fuel tank when pouring oil into the fuel tank, affecting the quality of the oil, this application provides a gasoline engine.

[0006] The gasoline engine provided by this application adopts the following technical solutions:

[0007] A gasoline engine, comprising a frame, an engine and a fuel tank arranged on the frame, a fuel filling port is opened on the fuel tank, an end cover is threadedly connected to the fuel tank, the end cover is used to cover the fuel filling port, a fixing ring is arranged on the fuel tank, the fixing ring is arranged around the fuel filling port, a receiving cavity is arranged inside the fixing ring, a plurality of air outlets are circumferentially opened on the outer peripheral wall of the fixing ring, the air outlets are communicated with the receiving cavity and face the upper end surface of the fuel tank, a through hole communicated with the receiving cavity is further opened on the outer side wall of the fixing ring, an elastic membrane is arranged on the fixing ring, the elastic membrane covers the through hole, a connecting block is arranged on the elastic membrane, the connecting block is rotatably connected to the end cover, and when the end cover is separated from the fuel tank, the connecting block is separated from the end cover.

[0008] By adopting the above technical solution, when refueling is required, the end cover is rotated to move the end cover away from the fuel tank. The end cover drives the connecting block to move, and the connecting block drives the elastic membrane to deform in a direction away from the fuel tank, so that the air around the fixing ring is sucked into the receiving cavity. When the end cover is separated from the fuel tank, at this time, the connecting block is separated from the end cover and drives the elastic membrane to reset, so that the gas sucked into the receiving cavity is discharged from the air outlet, thereby blowing away the dust around the fuel filling port, reducing the dust accumulated on the upper end surface of the fuel tank, and making the dust remaining on the upper end surface of the fuel tank away from the fuel filling port, reducing the dust from falling into the airflow range generated by the flowing oil during refueling, thereby reducing the situation of bringing dust into the fuel tank during refueling, which is beneficial to improving the quality of the oil in the fuel tank.

[0009] Preferably, the end cover includes a connecting column threadedly connected to the fuel tank, a butting block slidably connected to the connecting column, and an elastic member arranged on the connecting column. The connecting block is arranged around the outer periphery of the connecting column, a limiting groove is opened on the connecting block, and the limiting groove is provided for the butting block to slidably engage. The elastic member abuts against the butting block, so that the butting block has a tendency to be engaged in the limiting groove. An arc surface is arranged on the butting block, the arc surface protrudes towards the direction close to the limiting groove, the arc surface abuts against the connecting block, and the connecting block is rotatably connected to the connecting column through the cooperation of the connecting column and the butting block.

[0010] By adopting the above technical solution, when the end cover is away from the fuel tank, the connecting block abuts against the arc surface and pushes the butting block to gradually move closer to the connecting column. At this time, the elastic membrane deforms. As the connecting block moves, the greater the deformation degree of the elastic membrane, the greater the elastic force. When the end cover is separated from the fuel tank, the elastic force of the elastic membrane reaches a certain value and pushes the butting block out of the limiting groove through the connecting block. At this time, the connecting block is separated from the end cover and resets under the action of the elastic membrane. Dust blowing can be realized while removing the end cover without adding additional operation steps, and the operation is more convenient.

[0011] When the end cover is threadedly connected to the fuel tank, the arc surface abuts tightly against the connecting block. The connecting block pushes the abutting block along the arc surface to move closer to the connecting column, causing the connecting block and the abutting block to be staggered, so that the connecting block can move to abut against the limiting portion. At this time, the abutting block is aligned with the limiting groove and is snapped into the limiting groove under the action of the elastic member, making it more convenient to snap the abutting block into the limiting groove.

[0012] Preferably, the elastic film includes a covering portion, a connecting portion provided on the covering portion, and a mounting portion provided on the connecting portion. A card slot is formed on the covering portion for the fixing ring to be snapped into. Convex strips are provided on two opposite inner walls of the card slot. A limiting ring groove is formed on the fixing ring, and the limiting ring groove and the convex strips are correspondingly arranged. The limiting ring groove is for the corresponding convex strips to be snapped into, and the convex strips abut tightly against the inner wall of the limiting ring groove. A mounting groove is formed on the connecting block for the mounting portion to be snapped into for positioning.

[0013] By adopting the above technical solution, when the elastic film is damaged, the convex strip can be forced out of the limiting ring groove, and then the connecting block together with the elastic film can be removed from the fixing ring. Then, by applying force to take the mounting portion out of the mounting groove, the damaged elastic film can be removed and replaced. The mounting portion of the replaced elastic film is snapped into the mounting groove, and then the convex strips on both sides of the card slot are spread apart and respectively snapped into the corresponding limiting ring grooves, and the installation of the elastic film can be realized. There is no need to replace the fixing ring and the connecting block, which is beneficial to extending the service life of the fixing ring and the connecting block and reducing material loss.

[0014] Preferably, an inclined surface is provided on the inner wall of the limiting ring groove away from the fuel tank, and the inclined surface inclines inwards in the direction away from the fuel tank. When the convex strip is located in the limiting ring groove, the convex strip fits against the inner wall of the limiting ring groove.

[0015] By adopting the above technical solution, the inclined surface is provided. When the elastic film deforms in the direction away from the fixing ring, the inclined surface abuts tightly against the inner wall of the limiting ring groove, thereby generating an anchoring effect and reducing the situation of the convex strip detaching from the limiting ring groove, which is beneficial to the stable realization of the blowing function.

[0016] Preferably, the connecting column includes a threaded portion threadedly connected to the fuel tank and a limiting portion provided on the threaded portion. The limiting portion is located on the side of the connecting block away from the fuel tank. An abutting ring groove is formed on the limiting portion for the connecting block to be snapped into. When the connecting block is snapped into the abutting ring groove, the connecting block abuts against the inner wall of the abutting ring groove.

[0017] By adopting the above technical solution, an abutting ring groove is provided, and the connecting block is abutted through the abutting ring groove to limit the connecting block, reducing the situation that when the end cover moves away from the fuel tank, the abutting block abuts tightly against the connecting block, causing the connecting block to drive the elastic membrane to deform in a direction away from the connecting column, which is beneficial to delaying the elastic fatigue of the elastic membrane.

[0018] Preferably, the cross-section of the installation part is circular.

[0019] By adopting the above technical solution, when connecting the elastic membrane and the connecting block, the smooth surface of the installation part helps to insert the installation part into the installation groove, making it more convenient to connect the elastic membrane and the connecting block, and the elastic membrane and the connecting block can be prevented from separating by abutting the installation part against the inner wall of the installation groove, improving the connection stability between the elastic membrane and the connecting block.

[0020] Preferably, an elastic sheet I is provided on the outer peripheral wall of the fixing ring, the elastic sheet I is arranged corresponding to the air outlet, the elastic sheet I covers the corresponding air outlet, and the upper end of the elastic sheet I is connected to the fixing ring. An air inlet is also provided on the fixing ring, the air inlet is located on the side of the air outlet away from the fuel tank, and an elastic sheet II is also provided on the fixing ring, and the elastic sheet II is located in the accommodating cavity and covers the air inlet.

[0021] By adopting the above technical solution, when the end cover moves away from the fuel tank, the gas outside the fixing ring enters through the air inlet. At this time, the elastic sheet II is pressed against the fixing ring by the air flow to block the air outlet. Since the air inlet is located on the side of the air outlet away from the fuel tank, the dust brought into the upper end surface of the fuel tank during the suction process can be reduced. When exhausting, the gas is discharged from the air outlet. At this time, the elastic sheet I is pressed against the inner wall of the accommodating cavity by the air flow to block the air inlet, reducing the gas loss, making more gas discharged from the air outlet. The gas pushes the elastic sheet II to deform, causing the elastic sheet II to tilt downward away from the fixing ring, guiding the gas to the upper end surface of the fuel tank and improving the dust blowing effect.

[0022] Preferably, the air inlet is inclined upward in a direction away from the fixing ring.

[0023] By adopting the above technical solution, the situation of sucking the dust on the upper end surface of the fuel tank into the accommodating cavity is reduced, and further, the situation that the gas discharged from the air outlet carries dust and pollutes the surrounding of the fuel filling port is reduced.

[0024] In summary, the present application includes at least one of the following beneficial technical effects:

[0025] 1. When refueling is required, turn the end cap so that the end cap moves away from the fuel tank, driving the elastic membrane to deform, causing the air around the fixed ring to be sucked into the accommodating cavity. Until the end cap detaches from the fuel tank, the elastic membrane resets, causing the gas sucked into the accommodation to be discharged from the air outlet, thereby blowing away the dust around the fuel filler, reducing the dust accumulated on the upper end of the fuel tank, and keeping the dust remaining on the upper end surface of the fuel tank away from the fuel filler, reducing the dust from falling into the airflow range generated by the flowing oil during refueling, thereby reducing the situation of bringing dust into the fuel tank during refueling, which is beneficial to improving the quality of the oil in the fuel tank;

[0026] 2. When the end cap moves away from the fuel tank, the connecting block abuts against the arc surface, pushing the abutting block to gradually move closer to the connecting column. When the end cap detaches from the fuel tank, the elastic force of the elastic membrane reaches a certain value and pushes the abutting block out of the limiting groove through the connecting block. At this time, the connecting block detaches from the end cap and resets under the action of the elastic membrane. Blowing dust can be achieved while removing the end cap without adding extra operation steps, making the operation more convenient;

[0027] 3. By setting the first elastic piece and the second elastic piece, when the end cap moves away from the fuel tank, the gas outside the fixed ring enters through the air inlet, which can reduce the dust brought onto the upper end surface of the fuel tank during the suction process. When exhausting, the gas is discharged from the air outlet. At this time, the air inlet is blocked to reduce gas loss. The gas pushes the second elastic piece to deform, guiding the gas to the upper end surface of the fuel tank to improve the dust blowing effect. Description of the Drawings

[0028] Figure 1 is the overall schematic diagram of the embodiment of the present application;

[0029] Figure 2 is the front view of the embodiment of the present application sectioned at the fuel tank, mainly showing the structure of the end cap;

[0030] Figure 3 is Figure 2 the enlarged view of part A in

[0031] Figure 4 is the sectional view of the local part of the embodiment of the present application at the end cap, fixed ring, elastic membrane and connecting block, mainly showing the structure of the connecting column.

[0032] Description of reference numerals: 1, frame; 2, engine; 3, fuel tank; 31, fuel filling port; 4, end cap; 41, connecting column; 411, threaded portion; 4111, chute; 412, limiting portion; 4121, abutting ring groove; 42, abutting block; 421, arc surface; 43, elastic member; 5, fixing ring; 51, accommodating cavity; 52, air outlet; 53, air inlet; 54, through hole; 6, first elastic sheet; 7, second elastic sheet; 8, elastic membrane; 81, covering portion; 811, card slot; 82, connecting portion; 83, mounting portion; 9, rib; 91, limiting ring groove; 911, inclined surface; 10, connecting block; 101, mounting groove; 102, limiting groove. Detailed implementation manners

[0033] The following further describes the present application in conjunction with the attached Figures 1-4 drawings.

[0034] An embodiment of the present application discloses a gasoline engine. Refer to Figure 1 the drawings. The gasoline engine includes a frame 1, an engine 2 and a fuel tank 3. The engine 2 and the fuel tank 3 are both located above the frame 1 and fixedly connected to the frame 1.

[0035] Refer to Figure 2 and Figure 3 the drawings. An upper end surface of the fuel tank 3 is provided with a fuel filling port 31. A threaded end cap 4 is also threadedly connected to the fuel tank 3. The end cap 4 is threadedly connected into the fuel filling port 31, and the end cap 4 is used to cover the fuel filling port 31.

[0036] Refer to Figure 2 and Figure 3 the drawings. A fixing ring 5 is fixedly provided on the upper end surface of the fuel tank 3. The fixing ring 5 is arranged around the fuel filling port 31 and fixedly connected to the fuel tank 3. An accommodating cavity 51 is formed in the fixing ring 5. The accommodating cavity 51 is arranged around the fuel filling port 31. A plurality of air outlets 52 and a plurality of air inlets 53 are formed in an outer peripheral wall of the fixing ring 5 away from the fuel filling port 31. The plurality of air outlets 52 are circumferentially and evenly spaced around the outer periphery of the fixing ring 5 and communicate with the accommodating cavity 51. Each air outlet 52 faces the upper end surface of the fuel tank 3. The plurality of air inlets 53 are all located on a side of the air outlet 52 away from the fuel tank 3 and are circumferentially and evenly spaced around the outer periphery of the fixing ring 5. The air inlets 53 communicate with the accommodating cavity 51. Each air inlet 53 is inclined upward in a direction away from the fixing ring 5.

[0037] Refer to Figure 3 the drawings. A plurality of first elastic sheets 6 are fixedly provided on the outer peripheral wall of the fixing ring 5 away from the fuel filling port 31. The number and positions of the first elastic sheets 6 correspond to the number and positions of the air outlets 52 one by one. The first elastic sheets 6 cover the corresponding air outlets 52 and are arranged in a manner of being attached to the outer peripheral wall of the fixing ring 5. The upper end of each first elastic sheet 6 is fixedly connected to the fixing ring 5. In this embodiment, the material of the first elastic sheet 6 is silicone.

[0038] Refer toFigure 3 On the fixed ring 5, a number of second elastic pieces 7 are also fixed. The number and positions of the second elastic pieces 7 correspond one-to-one with the number and positions of the air inlets 53. The second elastic pieces 7 are located in the accommodation cavity 51 and cover the corresponding air inlets 53, and the second elastic pieces 7 are arranged in contact with the inner peripheral wall of the accommodation cavity 51. The lower end of each second elastic piece 7 is fixedly connected to the inner wall of the accommodation cavity 51. In this embodiment, the material of the second elastic piece 7 is silica gel.

[0039] See Figure 3 On the upper end surface of the fixed ring 5, a number of through holes 54 are also formed. The number of through holes 54 are evenly spaced along the length direction of the fixed ring 5 and communicate with the accommodation cavity 51. An elastic membrane 8 is provided on the fixed ring 5. The elastic membrane 8 includes a covering portion 81, a number of connecting portions 82 and a number of mounting portions 83. The covering portion 81 is located above the fixed ring 5 and covers the number of through holes 54. A clamping groove 811 is formed on the end surface of the covering portion 81 close to the fixed ring 5. The clamping groove 811 is for the fixed ring 5 to be clamped into. On the opposite inner walls of the clamping groove 811, a convex strip 9 is fixed. The convex strip 9 is arranged around the outer periphery of the fuel filling port 31, and the two convex strips 9 are aligned and arranged at intervals. A limiting ring groove 91 is formed on the outer side wall of the fixed ring 5. The number and positions of the limiting ring grooves 91 correspond one-to-one with the number and positions of the convex strips 9. The limiting ring groove 91 is for the corresponding convex strip 9 to be clamped into.

[0040] See Figure 3 On the inner walls of the two limiting ring grooves 91 away from the fuel tank 3, inclined surfaces 911 are machined. The inclined surfaces 911 are inclined inwards in the direction away from the fuel tank 3. When the convex strip 9 is located in the corresponding limiting ring groove 91, the convex strip 9 is in contact with the inner wall of the corresponding limiting ring groove 91.

[0041] See Figure 3 A number of connecting portions 82 are all located on the side of the covering portion 81 away from the fixed ring 5 and are circumferentially evenly spaced along the outer periphery of the fuel filling port 31, and a number of connecting portions 82 are all fixedly connected to the covering portion 81. The number and positions of the mounting portions 83 correspond one-to-one with the number and positions of the connecting portions 82. Each mounting portion 83 is located on the side of the corresponding connecting portion 82 away from the covering portion 81 and is fixedly connected to the corresponding connecting portion 82. The cross-section of the mounting portion 83 is circular. In this embodiment, the covering portion 81, the connecting portions 82 and the mounting portions 83 are integrally arranged. The covering portion 81, the connecting portions 82 and the mounting portions 83 are all made of silica gel.

[0042] See Figure 3 On the elastic membrane 8, a connecting block 10 is provided. The connecting block 10 is located on the side of the elastic membrane 8 away from the fixed ring 5. An installation groove 101 is formed on the end surface of the connecting block 10 close to the elastic membrane 8. The number and positions of the installation grooves 101 correspond one-to-one with the number and positions of the mounting portions 83. The installation groove 101 is for the mounting portion 83 to be clamped into. When the mounting portion 83 is located in the installation groove 101, the inner wall of the installation groove 101 is arranged in contact with the surface of the mounting portion 83.

[0043] In actual use, when the elastic membrane 8 needs to be replaced, apply force to take out the two convex strips 9 from the corresponding limit ring grooves 91 respectively, and then apply force to take out the installation part 83 from the installation groove 101, so that the elastic membrane 8 can be removed. Then, snap the installation part 83 on the replaced elastic membrane 8 into the installation groove 101. The installation part 83 abuts against the inner wall of the installation groove 101 to achieve positioning, thereby realizing the connection between the elastic membrane 8 and the connection block 10. Then, expand the two convex strips 9 and snap them into the corresponding limit ring grooves 91 respectively. By the two convex strips 9 abutting against the inner walls of the corresponding ring grooves, the connection between the elastic membrane 8 and the fixed ring 5 can be realized, and the installation of the elastic membrane 8 can be completed.

[0044] See Figure 3 and Figure 4 , the end cover 4 includes a connecting column 41, an abutting block 42 and an elastic member 43. The connecting column 41 includes a threaded portion 411 and a limiting portion 412. The threaded portion 411 is threadedly connected to the fuel filling port 31. The connecting block 10 is arranged around the outer periphery of the threaded portion 411. The limiting portion 412 is located outside the fuel tank 3 and fixedly connected to the end of the threaded portion 411 away from the fuel tank 3. And the limiting portion 412 is located on the side of the connecting block 10 away from the fuel tank 3. An abutting ring groove 4121 is formed on the end face of the limiting portion 412 close to the connecting block 10. The abutting ring groove 4121 is for the connecting block 10 to snap into. When the connecting block 10 snaps into the abutting ring groove 4121, the connecting block 10 is arranged in conformity with the inner wall of the abutting ring groove 4121.

[0045] See Figure 4 , a plurality of sliding grooves 4111 are formed on the outer side wall of the threaded portion 411. The plurality of sliding grooves 4111 are circumferentially and evenly spaced around the outer periphery of the threaded portion 411. The number and positions of the abutting blocks 42 correspond to the number and positions of the sliding grooves 4111 one by one. The abutting blocks 42 are located on the side of the connecting block 10 close to the threaded portion 411 and are slidably connected in the corresponding sliding grooves 4111. The abutting blocks 42 slide out or into the corresponding sliding grooves 4111. An arc surface 421 is formed on the outer side wall of the abutting block 42. The arc surface 421 is located at one end of the abutting block 42 away from the bottom of the corresponding sliding groove 4111, and the arc surface 421 protrudes towards the direction close to the connecting block 10. A limiting groove 102 is formed on the outer side wall of the connecting block 10 close to the threaded portion 411. The limiting groove 102 is arranged around the outer periphery of the threaded portion 411. The limiting groove 102 is for the abutting blocks 42 to snap into. When the threaded portion 411 is twisted, the connecting block 10 is rotationally connected to the threaded portion 411 through the cooperation of the threaded portion 411 and the abutting blocks 42, and the rotation axis of the connecting block 10 is vertically arranged.

[0046] See Figure 4, the number and position of the elastic members 43 correspond one-to-one with the number and position of the sliding grooves 4111. The elastic members 43 are located in the corresponding sliding grooves 4111, and the elastic members 43 are located between the corresponding abutting blocks 42 and the bottom of the corresponding sliding grooves 4111. The opposite ends of the elastic members 43 are fixedly connected to the corresponding abutting blocks 42 and the inner wall of the bottom of the corresponding sliding grooves 4111 respectively, and the opposite ends of the elastic members 43 are respectively abutted against the corresponding abutting blocks 42 and the inner wall of the bottom of the corresponding sliding grooves 4111, so that the corresponding abutting blocks 42 have a tendency to snap into the limiting grooves 102. In this embodiment, the elastic members 43 are springs.

[0047] The implementation principle of an embodiment of a gasoline engine in this application is as follows:

[0048] When refueling is required, rotate the threaded portion 411 so that the threaded portion 411 moves away from the fuel tank 3. The threaded portion 411 drives the connecting block 10 to move by abutting against the inner wall of the limiting groove 102 through the abutting block 42. The connecting block 10 drives the elastic membrane 8 to deform in a direction away from the fuel tank 3, so that the air around the fixing ring 5 is sucked into the accommodating cavity 51 from the air inlet 53 until the threaded portion 411 disengages from the fuel tank 3. At this time, the elastic force of the elastic membrane 8 reaches a certain value and pushes the abutting block 42 to disengage from the limiting groove 102 through the connecting block 10. The disengaged end of the connecting block 10 from the end cover 4 is reset under the action of the elastic membrane 8, so that the gas sucked into the accommodating cavity 51 is discharged from the air outlet 52, thereby blowing away the dust around the fuel filling port 31, reducing the dust accumulated on the upper end of the fuel tank 3, and making the dust remaining on the upper end surface of the fuel tank 3 away from the fuel filling port 31, reducing the dust from falling into the airflow range generated by the flowing oil during refueling, thereby reducing the situation of bringing dust into the fuel tank 3 during refueling, which is beneficial to improving the quality of the oil in the fuel tank 3.

[0049] The above are all the preferred embodiments of this application. The protection scope of this application is not limited accordingly. Therefore, all equivalent changes made according to the structure, shape, and principle of this application should be covered within the protection scope of this application.

Claims

1. A gasoline engine, comprising a frame (1), an engine (2) and a fuel tank (3) provided on the frame (1). A fuel filling port (31) is formed on the fuel tank (3). An end cover (4) is threadedly connected to the fuel tank (3), and the end cover (4) is used to cover the fuel filling port (31). Characterized in that: A fixing ring (5) is provided on the fuel tank (3). The fixing ring (5) is arranged around the fuel filling port (31). An accommodating cavity (51) is arranged inside the fixing ring (5). A plurality of air outlets (52) are circumferentially formed on the outer peripheral wall of the fixing ring (5). The air outlets (52) communicate with the accommodating cavity (51) and face the upper end surface of the fuel tank (3). A through hole (54) communicating with the accommodating cavity (51) is further formed on the outer side wall of the fixing ring (5). An elastic film (8) is provided on the fixing ring (5). The elastic film (8) covers the through hole (54). A connecting block (10) is provided on the elastic film (8). The connecting block (10) is rotatably connected to the end cover (4). When the end cover (4) is separated from the fuel tank (3), the connecting block (10) is separated from the end cover (4). The end cover (4) includes a connecting column (41) threadedly connected to the fuel tank (3), an abutting block (42) slidably connected to the connecting column (41), and an elastic member (43) provided on the connecting column (41). The connecting block (10) is arranged around the outer periphery of the connecting column (41). A limiting groove (102) is formed on the connecting block (10). The limiting groove (102) is for the abutting block (42) to slidably engage. The elastic member (43) abuts against the abutting block (42), so that the abutting block (42) has a tendency to engage in the limiting groove (102). An arc surface (421) is provided on the abutting block (42). The arc surface (421) protrudes towards the direction close to the limiting groove (102). The arc surface (421) abuts against the connecting block (10). The connecting block (10) is rotatably connected to the connecting column (41) through the cooperation of the connecting column (41) and the abutting block (42).

2. The gasoline engine according to claim 1, Characterized in that: The elastic film (8) includes a covering portion (81), a connecting portion (82) provided on the covering portion (81), and a mounting portion (83) provided on the connecting portion (82). A clamping groove (811) is formed on the covering portion (81). The clamping groove (811) is for the fixing ring (5) to be clamped into. Convex strips (9) are provided on the opposite two inner walls of the clamping groove (811). A limiting ring groove (91) is formed on the fixing ring (5). The limiting ring groove (91) corresponds to the convex strip (9). The limiting ring groove (91) is for the corresponding convex strip (9) to be clamped into. The convex strip (9) abuts against the inner wall of the limiting ring groove (91). A mounting groove (101) is formed on the connecting block (10). The mounting groove (101) is for the mounting portion (83) to be clamped and positioned.

3. The gasoline engine according to claim 2, It is characterized in that: An inclined surface (911) is provided on the inner wall of the limiting ring groove (91) away from the fuel tank (3). The inclined surface (911) is inclined inwards in the direction away from the fuel tank (3). When the convex strip (9) is located in the limiting ring groove (91), the convex strip (9) fits against the inner wall of the limiting ring groove (91).

4. The gasoline engine according to claim 2, It is characterized in that: The connecting column (41) includes a threaded portion (411) threadedly connected to the fuel tank (3) and a limiting portion (412) provided on the threaded portion (411). The limiting portion (412) is located on the side of the connecting block (10) away from the fuel tank (3). An abutting ring groove (4121) is formed on the limiting portion (412) for the connecting block (10) to be inserted into. When the connecting block (10) is inserted into the abutting ring groove (4121), the connecting block (10) abuts against the inner wall of the abutting ring groove (4121).

5. The gasoline engine according to claim 2, It is characterized in that: The cross-section of the mounting portion (83) is circular.

6. The gasoline engine according to claim 1, It is characterized in that: An elastic sheet one (6) is provided on the outer peripheral wall of the fixing ring (5). The elastic sheet one (6) is arranged corresponding to the air outlet (52). The elastic sheet one (6) covers the corresponding air outlet (52), and The upper end of the elastic sheet one (6) is connected to the fixing ring (5). An air inlet (53) is further formed on the fixing ring (5). The air inlet (53) is located on the side of the air outlet (52) away from the fuel tank (3). An elastic sheet two (7) is further provided on the fixing ring (5). The elastic sheet two (7) is located in the accommodating cavity (51) and covers the air inlet (53).

7. The gasoline engine according to claim 6, It is characterized in that: The air inlet (53) is inclined upwards in the direction away from the fixing ring (5).

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