CN105502271A

CN105502271A - Refueling sleeve

Info

Publication number: CN105502271A
Application number: CN201610007974.1A
Authority: CN
Inventors: 杨亚鹏
Original assignee: Shenzhen Shangjia Energy Network Co Ltd
Current assignee: Shenzhen Shangjia Energy Network Co Ltd
Priority date: 2016-01-07
Filing date: 2016-01-07
Publication date: 2016-04-20
Anticipated expiration: 2036-01-07
Also published as: CN105502271B

Abstract

The invention discloses a refueling sleeve which is used for a refueling gun. The refueling sleeve comprises a refueling pipe and a retractable sleeve, wherein an inlet end of the refueling pipe is connected onto a gun body of the refueling gun and fuel oil can pass through the refueling pipe; the retractable sleeve sleeves the refueling pipe; at a static state, the end part of an outlet end of the refueling pipe is located in the retractable sleeve; and at a refueling state, the retractable sleeve is compressed, and the outlet end of the refueling pipe stretches out from the retractable sleeve. According to the refueling sleeve provided by the invention, the retractable sleeve sleeves the refueling pipe so that the refueling pipe is not exposed to the outside; and in a refueling process, the retractable sleeve is compressed and the refueling pipe stretches into a refueling container, so that fuel oil and oil gas are prevented from leakage.

Description

Oil filling sleeve

Technical Field

The invention relates to a fuel gun component, in particular to a fuel filling sleeve for a fuel gun.

Background

At present, the vehicle is refueled by adopting a fuel nozzle to inject fuel into a fuel tank on the vehicle. Generally, in the process of refueling, the refueling pipe and the oil tank are in an open state, and oil gas easily leaks out to cause potential safety hazards. In addition, after refueling, after the nozzle breaks away from the oil tank, the residual oil in the barrel of the nozzle can be leaked out, and part of oil gas can be volatilized, so that the energy is wasted, the environment is also polluted, and potential safety hazards exist.

Although the barrel of some existing oil filling guns can realize the self-sealing function, the self-sealing valve for realizing the self-sealing function is arranged on the gun body of the oil filling gun, residual fuel oil in the barrel after the self-sealing valve still can be leaked out in a dripping mode, and the drip prevention can not be thoroughly realized.

Disclosure of Invention

The invention aims to provide a fuel filling sleeve for a fuel filling gun.

The technical scheme adopted by the invention for solving the technical problems is as follows: the refueling sleeve is used for a refueling gun and comprises a refueling pipe and a telescopic sleeve, wherein the inlet end of the refueling pipe is connected to a gun body of the refueling gun and is used for fuel to pass through, and the telescopic sleeve is sleeved outside the refueling pipe;

in a static state, the end part of the outlet end of the oil filling pipe is positioned in the telescopic sleeve;

in the oiling state, the telescopic sleeve is compressed, and the outlet end of the oiling pipe extends out of the telescopic sleeve.

Preferably, the fuel filling sleeve further comprises a blocking piece mounted on one end of the retractable sleeve far away from the gun body;

in the static state, the oil filling pipe is blocked in the telescopic sleeve by the blocking piece;

in the oiling state, the outlet end of the oil filling pipe pushes the plugging piece to extend out of the telescopic sleeve.

Preferably, the blocking piece comprises a blocking seat and a blocking sheet, the blocking seat is provided with a channel which penetrates through two ends of the blocking seat and is used for the oil filling pipe to pass through, and the blocking sheet is rotatably arranged in the channel through an elastic resetting piece to close or open the channel; the end part of the telescopic sleeve is abutted against the plugging seat;

in the static state, the outlet end of the oil filling pipe is positioned in the channel and is positioned on the inner side of the plugging sheet, and the plugging sheet seals the channel; in the oiling state, the oil filling pipe jacks the plugging sheet to enable the plugging sheet to rotate to open the channel, and the outlet end of the oil filling pipe penetrates through the channel and extends out of the plugging seat.

Preferably, the refueling sleeve further comprises a first end cover sleeved on the periphery of the inlet end of the refueling pipe, an annular step is arranged on the periphery of the first end cover, and one end part of the telescopic sleeve, facing the gun body, abuts against the annular step;

the first end cover is provided with at least one through hole, and the through hole radially extends through the first end cover and is communicated with the inside of the telescopic sleeve; the vacuum breaking valve is arranged on the through hole and used for closing or opening the through hole, and the vacuum breaking valve is opened when negative pressure is generated in the telescopic sleeve to open the through hole.

Preferably, the retractable sleeve is a resilient metal bellows.

Preferably, the fuel filler pipe includes a connecting section connected to the gun body, an insertion section inserted into the fuel tank, and a bendable section connected between the connecting section and the insertion section, the inlet end being located on the connecting section, and the outlet end being located on the insertion section.

Preferably, an oil outlet channel and a self-sealing channel which extend along the axial direction of the oil filling pipe and are isolated from each other are arranged in the oil filling pipe; the oil outlet channel penetrates through the oil filling pipe; the self-sealing channel is stopped at the inserting section, and the side wall of the inserting section is provided with a self-sealing hole which radially penetrates through the self-sealing channel.

Preferably, the outlet end of the oil filling pipe is also provided with a drip-proof check valve;

the check valve comprises a base, a telescopic elastic piece and a valve plate connected to the base through the elastic piece; the valve plate is arranged in the oil outlet channel, and the valve plate moves towards the direction close to or far away from the base to control the on-off of the oil outlet channel.

Preferably, the oil filling sleeve further comprises a protective sleeve sleeved on the periphery of the telescopic sleeve, and the length of the telescopic sleeve and the length of the oil filling pipe are greater than the length of the protective sleeve;

in the static state, one end of the telescopic sleeve extends out of the protective sleeve;

in the oiling state, the telescopic sleeve is compressed into the protective sleeve, so that the outlet end of the oiling pipe extends out of the telescopic sleeve.

Preferably, the protective sleeve comprises a tube body and a connecting piece which is arranged at the end part of the tube body and is rotationally buckled with the oil tank cover;

the connecting piece comprises a barrel body axially connected to the end part of the pipe body and a connecting mechanism arranged on the barrel body and buckled with the oil tank cover;

the connecting mechanism comprises a plurality of blocking parts which are rotationally clamped with the clamping pieces on the oil tank cover, and the blocking parts are arranged on the end surface of the barrel body far away from the pipe body; the blocking parts are distributed at intervals, and gaps for the clamping piece to penetrate through to enter the barrel are formed at intervals among the blocking parts; or,

the connecting mechanism comprises threads which are arranged on the inner wall of the cylinder body and matched with the oil tank cover.

The invention has the beneficial effects that: the oil filling pipe is sleeved in the telescopic sleeve, so that the oil filling pipe is not leaked; when the oil is filled, the telescopic sleeve is compressed to make the oil filling pipe extend into the oil filling container, so that the leakage of fuel oil and oil gas can be prevented.

Drawings

The invention will be further described with reference to the accompanying drawings and examples, in which:

FIG. 1 is a schematic view of a fuel filler sleeve on a fuel gun according to an embodiment of the present invention;

FIG. 2 is a cross-sectional view of the fuel gun of FIG. 1;

FIG. 3 is a schematic view of the fuel gun of FIG. 2 in a refueling configuration;

FIG. 4 is a schematic structural view of the filler pipe of FIG. 2;

fig. 5 is a cross-sectional view of the retractable sleeve of fig. 2;

FIG. 6 is a schematic view of the protective sleeve of FIG. 2;

FIG. 7 is a schematic perspective view of the oil tank cap of FIG. 3;

FIG. 8 is a cross-sectional view of another embodiment of the oil tank cap of FIG. 3.

Detailed Description

For a more clear understanding of the technical features, objects and effects of the present invention, embodiments of the present invention will now be described in detail with reference to the accompanying drawings.

As shown in fig. 1 and 2, a fuel filler neck according to an embodiment of the present invention is mounted on a gun body 10 of a fuel filler gun. The fuel filling sleeve comprises a fuel filling pipe 20 and a telescopic sleeve 30 sleeved outside the fuel filling pipe 20, wherein the inlet end of the fuel filling pipe 20 is connected to the gun body 10 and fuel passes through the fuel filling pipe.

As shown in FIG. 2, in the resting state (not refueling), the outlet end of the filler tube 20 is positioned within the telescoping tube 30; as shown in FIG. 3, in the fuel loading state, the retractable sleeve 30 is compressed and the outlet end of the fuel filler tube 20 extends from within the retractable sleeve 30.

The fuel filler pipe 20 may be a fixed-shape metal pipe or a bendable metal pipe. Referring to fig. 4, in the present embodiment, the filler tube 20 is a bendable filler tube including a connecting section 21 connected to the gun body 10, an inserting section 23 inserted into a fuel container such as a fuel tank, and a bendable section 22 connected between the connecting section 21 and the inserting section 23, and the inlet end of the filler tube 20 is located on the connecting section 21 and the outlet end is located on the inserting section 23. The bending of the whole oil filling pipe 20 is realized through the bending of the bendable section 22, the direction of the insertion section 23 of the oil filling pipe 20 can be adjusted, and the oil filling container can be conveniently inserted for oil filling.

Preferably, the bendable section 23 of the filler tube 20 is a metal bellows section.

An oil outlet channel 24 and a self-sealing channel 25 are arranged in the oil filling pipe 20, and the oil outlet channel 24 and the self-sealing channel 25 extend along the axial direction of the oil filling pipe 20 and are isolated from each other; the fuel outlet passage 24 is for fuel to pass through to enter the refueling receptacle. Wherein the oil outlet passage 24 penetrates the filler pipe 20, i.e., extends from the connecting section 21 to the insertion section 23, penetrating the inlet and outlet ends of the filler pipe 20. The self-sealing passage 25 terminates at the insertion section 23 and extends through the inlet end of the filler tube 20, but not through the outlet end of the filler tube 20. The sidewall of the insertion section 23 is provided with a self-sealing hole 26 radially penetrating the self-sealing passage 25, and the self-sealing hole 26 can communicate with the inside of the refueling container during refueling. When the oil container is full of oil, the oil blocks the self-sealing hole 26, and the oil gun jumps to stop oiling.

Further, a drip-proof check valve 27 is also provided at the outlet end of the filler tube 20. The check valve 27 is located outside the self-sealing channel 25 on the filler tube 20. The check valve 27 also prevents frequent gun trips of the fuel gun.

As an embodiment, the check valve 27 includes a base 271, a stretchable elastic member 272, and a valve plate 273 connected to the base 271 through the elastic member 272. The valve plate 273 is disposed in the oil outlet channel 24, and the opening and closing of the oil outlet channel 24 are controlled by moving the valve plate 273 in a direction approaching or separating from the base 271. The check valve 27 may be mounted on the outlet end of the filler tube 20 by a base 271. The outer circumference of the base 271 may be provided with a screw thread to be engaged with the inner circumference of the insertion section 23, or a step to be engaged with the outlet end of the insertion section 23.

The end surface of the base 271 opposite to the valve plate 273 is further provided with a through hole 274 communicating with the oil outlet passage 214 when the oil outlet passage 214 is opened.

Further, a sealing step 28 is provided in the oil outlet passage 24; the valve plate 273 is pressed against the sealing step 28 by the urging force of the elastic member 272, and closes the oil outlet passage 24.

The sealing step 28 is an annular step arranged on the inner wall of the insertion section 23, a hole in the middle of the annular step is smaller than the valve plate 273, and when the valve plate 273 is pressed against the sealing step 28, the hole in the middle of the annular step is closed, so that the sealing of the oil outlet channel 24 is realized.

When fuel is supplied, referring to fig. 2 and 4, fuel flows from the gun body 10 to the fuel filler pipe 20, flows to the valve plate 273 in the fuel outlet passage 24, pushes the valve plate 273, moves the valve plate 273 in a direction approaching the base 271 away from the sealing step 28, opens the fuel outlet passage 24, and flows out through the fuel outlet passage 24 and the through hole 274 in the base 271. When fuel flows backward toward the valve plate 273 through the through hole 274, the valve plate 273 is pushed against the sealing step 28 to close the fuel outlet passage 24, preventing the fuel from entering the fuel outlet passage 24. When the oil is not being filled, the valve plate 273 is pressed against the sealing step 28 by the restoring force of the elastic member 272, so as to close the oil outlet channel 24 and prevent the oil from dripping from the oil filling pipe 20, thereby achieving the function of drip prevention.

The retractable sleeve 30 is preferably a flexible metal bellows that fits over the filler tube 20 so that the filler tube 20 is not exposed and the filler tube 20 is protected.

Further, as shown in fig. 2, 3 and 5, the fuel filler sleeve further includes a closure member 50 mounted on an end portion of the retractable sleeve 30 remote from the gun body 10. In the resting state, the closure 50 closes the filler tube 20 within the retractable sleeve 30; in the refueling position, the outlet end of the filler tube 20 projects out of the retractable sleeve 30 against the unsealing member 50.

The plugging piece 50 comprises a plugging seat 51 and a plugging sheet 52, the plugging seat 51 is provided with a channel 53 which penetrates through two ends of the plugging seat and is used for the oil filling pipe 20 to pass through, and the plugging sheet 52 is rotatably arranged in the channel 53 through an elastic resetting piece to close or open the channel 53; the end of the retractable sleeve 30 abuts against the stopper seat 51. The outer circumference of the stopper seat 51 may be provided with a step to engage with the end of the telescoped sleeve 30.

In the rest state, the outlet end of the filler tube 20 is located inside the passage 53 and inside the plugging sheet 52, the plugging sheet 52 closing the passage 53; in the refueling position, the fuel filler tube 20 pushes against the opening tab 52, causing the opening tab 52 to rotate to open the passage 53, and the outlet end of the fuel filler tube 20 extends out of the closure seat 51 through the passage 53.

Further, the fuel filling sleeve further comprises a first end cover 29 sleeved on the periphery of the inlet end of the fuel filling pipe 20, an annular step 290 is arranged on the periphery of the first end cover 29, and one end of the retractable sleeve 30 facing the gun body 10 abuts against the annular step 290, so that one end of the retractable sleeve 30 is fixed on the fuel filling pipe 20. The first end cap 29 also seals the telescopic tube 30 from dust and the like and also from oil and gas leakage.

One end of the first end cap 29 can be tightly connected to the gun body 10, and the retractable sleeve 30 is sleeved on the outer circumference of the first end cap 29 from the other end thereof and abuts against the annular step 290. A gap is formed between the outer periphery of the filler tube 20 and the first end cap 29, so that the space between the retractable sleeve 30 and the filler tube 20 is communicated with the inner cavity of the gun body 10 through the gap; when the oil is filled, the oil gas is pumped back into the oil tank from the space between the retractable sleeve 30 and the filler pipe 20 by the vacuum pump in front of the filler gun.

In order to avoid the over-power of the vacuum pump from generating the over-high negative pressure inside the retractable sleeve 30, the first end cap 29 is provided with at least one through hole 291, and the through hole 291 radially extends through the first end cap 29 and communicates with the inside of the retractable sleeve 30. The through hole 291 is provided with a vacuum breaker 292 for closing or opening the through hole 291, and the through hole 292 is opened when the inside of the extendable sleeve 30 is negatively pressurized. The vacuum breaking valve 292 includes a valve seat, a spring, a steel ball, etc. when the inside of the retractable sleeve 30 is under negative pressure, the steel ball moves toward the inside of the valve seat at the opening of the valve seat to open the passage on the valve seat, thereby opening the through hole 291.

Further, the fuel filling sleeve also comprises a protective sleeve 40 which is sleeved on the periphery of the telescopic sleeve 30, and the length of the telescopic sleeve 30 and the length of the fuel filling pipe 20 are greater than that of the protective sleeve 40. In a static state, one end of the telescopic sleeve 30 extends out of the protective sleeve 40; in the fuel loading position, the retractable sleeve 30 is compressed into the protective sleeve 40 such that the outlet end of the fuel filler tube 20 extends from within the retractable sleeve 30. The protective sleeve 40 provides further protection to the retractable sleeve 30 and the filler tube 20.

As shown in fig. 1-3, the protective sleeve 40 is a metal tube, and may include a tube body 41 disposed around the retractable sleeve 30, and a connector disposed at an end of the tube body 41 for rotatably engaging with the fuel tank cap 60. Through protective sleeve 40 and fuel tank cap 60 normal running fit, can realize the sealed of refueling in-process with the oil filler hole sealing connection on nozzle and the refueling container, prevent that oil gas from diffusing to the air in, safety ring protects.

The connection member may include a barrel 42 axially connected to an end of the tube body 41, and a connection mechanism provided on the barrel 42 to be fastened to the tank cap 60. The cylinder 42 communicates with the inside of the tube 41.

The connecting member and the tube 41 are integrally formed and formed. In the connecting member, the inner diameter of the cylinder 42 is larger than that of the tube 41, so that the cylinder 42 protrudes radially outward from the tube 41 to form a cap structure to be engaged with the fuel tank cap 60.

In this embodiment, the connecting mechanism includes a plurality of blocking portions 43 rotatably engaged with the engaging member 61 on the fuel tank cap 60, and the blocking portions 43 are disposed on the end surface of the barrel 42 away from the tube 41 and extend toward the central axis of the barrel 42. The plurality of blocking parts 43 are distributed at intervals, and the intervals among the blocking parts 43 form gaps 44 for the clamping piece 61 to penetrate through to enter the cylinder 42. The plurality of stoppers 43 are symmetrically distributed on the end surface of the cylinder 42 with the axis of the cylinder 42 as the center.

In one embodiment, as shown in fig. 6, the stopper 43 includes a first stopper 431 extending from the end surface of the cylinder 42 to be bent toward the central axis of the cylinder 42. The engaging member 61 of the fuel lid 60 is rotatably engaged with the inner side of the first blocking piece 431. The blocking portion 43 further includes a second blocking piece 432 extending from the free end of the first blocking piece 431 to the tube 41 in a bending manner, and the length of the second blocking piece 432 is smaller than the length of the tube 42, so that a space is left between the second blocking piece 432 and the other end of the tube 42 for the clamping member 61 to clamp therein.

In the protective sleeve 40 shown in fig. 6, the attachment mechanism includes three stops 43 evenly spaced circumferentially about the barrel 42. The number of the clamping pieces 61 on the oil tank cover 60 is consistent with that of the blocking parts 43 and the notches 44, each clamping piece 61 is aligned to one notch 44, and after entering the cylinder body 41 from the notch 44, the clamping pieces rotate by a certain angle and then are matched with the inner side of the blocking parts 43, so that rotary buckling is realized. The latch 61 may be a barb structure, and is fastened between the second blocking piece 432 and the first blocking piece 431.

The end of the cylinder 42 facing the pipe body 41 is connected to the pipe body 41 via an annular side plate 45. The annular side plate 45 may be vertically connected between the cylinder 42 and the tube 41. Opposite the stopper 43, annular side plates 45 are located at both ends of the cylinder 42, respectively.

In other embodiments, the connection mechanism may also include threads provided on the inner wall of the cylinder 42 to engage with the fuel tank cap 60, so that the connection member is rotatably engaged with the fuel tank cap 60 by a screw-type engagement.

After the protective sleeve 40 is rotationally fastened with the fuel tank cap 60, the blocking piece 50 is tightly abutted against the fuel tank cap 60, so that the oil filling pipe 20 and the fuel tank cap 60 are sealed to prevent oil gas from leaking.

In addition, a second end cap may be further sleeved on the periphery of the retractable sleeve 30, and the other end of the protective sleeve 40 away from the fuel tank cap 60 may abut against the second end cap, so that the interior of the protective sleeve 40 is closed. In order to prevent the negative pressure from being generated in the protective sleeve 40, a channel may be provided on the second end cap to communicate with the interior of the protective sleeve 40, and a vacuum breaking valve may be provided on the channel. When the pressure in the protective sleeve 40 is too low, the steel ball of the vacuum breaking valve moves into the valve seat to open the channel on the protective sleeve 40, so that the interior of the protective sleeve 40 is connected with the outside air.

The refueling cartridge may or may not include a fuel cap 60. The catching member 61 of the tank cap 60 may have a barb shape.

Referring to fig. 3 and 7, the fuel tank cap 60 rotatably engaged with the protective sleeve 40 may include a barrel 62 having a channel 620, and a spring 63 disposed in the channel 620 for opening and closing the channel 620, wherein the snap 61 is disposed on an outer circumference of the barrel 62. The fuel tank cap 60 is fitted to the filler opening of the fuel tank container. The fuel cap 60 does not need to be removed when the fuel is filled, and after the fuel cap 60 is rotatably matched with the protective sleeve 40, the retractable sleeve 40 is compressed into the protective sleeve 40, and the fuel filling pipe 20 extends out of the protective sleeve 40 and can push the elastic sheet 63 open to enter the fuel filling container through the channel 620 of the fuel cap 60. After the refueling is completed, the protective sleeve 40 is rotated away from the fuel tank cap 60, the fuel filler pipe 20 leaves the refueling container, the retractable sleeve 30 is extended and restored to the periphery of the fuel filler pipe 20, and the elastic sheet 63 of the fuel tank cap 60 is reset to close the channel 620.

Specifically, the elastic sheet 63 is rotatably connected to the inner wall of the cartridge 62 through an elastic restoring member (such as a torsion spring, etc.), and rotates toward the inside of the oil tank under an external force to open the passage 620. The cartridge holder 62 may include a first end 621 connected to the fuel tank and a second end 622 rotatably engaged with the protective sleeve 10. The first end 621 of the barrel seat 62 is disposed corresponding to the size of the oil tank opening, and a sealing step or a sealing ring may be further disposed on the outer circumference of the first end 621 or the connection between the first end 621 and the second end 622 to tightly fit the oil tank opening. The snap members 61 are provided on the outer periphery of the second end 622. The first end 621 may have a screw thread around its periphery for screwing with the tank port.

In an embodiment of the fuel tank cap 60, as shown in fig. 3, a step surface 6201 is provided on the inner wall of the channel 620 corresponding to the second end 622, and the end of the blocking seat 51 of the blocking member 50 can tightly abut against the step surface 6201; a sealing ring may be further disposed between the end of the blocking seat 51 and the step surface 6201 for sealing, for example, a sealing groove 510 is disposed at the periphery of the end of the blocking seat 51 for placing the sealing ring, as shown in fig. 5.

In another embodiment of the tank cap 60, as shown in fig. 7 and 8, the channel 620 of the tank cap 60 may include a first through hole 623 having a larger inner diameter and a second through hole 624 having a smaller inner diameter. The first through hole 623 is located in the first end 621; a second through-hole 624 is located in the second end 622 and may also optionally extend into the second end 622.

A step surface 625 is formed at the joint of the second through hole 624 and the first through hole 623, and the edge of the elastic sheet 63 is pressed and fitted on the step surface 625. The inner surface of the second through hole 624 may further be provided with a sealing groove 626 for placing a sealing ring and being in sealing connection with the plugging member 50, so as to prevent oil and gas from leaking.

Further, the elastic sheet 63 is disposed in the first through hole 623 through the rotating shaft 631, the elastic reset piece 64 is sleeved on the rotating shaft 631, and two elastic arms thereof respectively abut against the inner walls of the elastic sheet 63 and the first through hole 623. The elastic sheet 63 is opened toward the inside of the fuel tank under the action of an external force (such as the pushing-open of the fuel filler pipe 20), and automatically resets through the restoring force of the elastic resetting piece 64 when the external force disappears. In order to ensure the sealing performance, the surface of the elastic sheet 63, which is connected with the step surface 625, and/or the surface of the step surface 625 are/is provided with a sealing layer, so that the elastic sheet 63 and the step surface 625 are tightly sealed. The sealing layer can be made of various sealing materials such as rubber, silica gel and the like.

The fuel filling sleeve of the present invention is installed on the gun body 10 to form an integral fuel filling gun, when filling fuel, the blocking piece 50 is aligned and abutted against the fuel tank cap 60, the protective sleeve 40 is aligned and pressed onto the fuel tank cap 60 to be rotationally matched with the fuel tank cap 60, at this time, the telescopic sleeve 30 is compressed into the protective sleeve 40, the fuel filling pipe 20 extends out of the telescopic sleeve 30 to jack the fuel tank cap 60, the insertion section 23 of the fuel filling pipe 20 passes through the blocking piece 50 to enter the fuel tank, and fuel enters the fuel tank through the fuel filling gun. In the oiling process, the protective sleeve 40 and the oil tank cover 60 are matched to seal a gap between the oil filling pipe 20 and the oil tank opening, so that the oiling process is closed, and oil gas is prevented from leaking.

After the refueling is finished, the fuel stops being delivered, and the check valve 27 on the refueling pipe 20 seals the fuel outlet channel 24 of the refueling pipe 20 to prevent the fuel from dripping and leaking; the protective sleeve 40 is rotated away from the fuel tank cap 60, the fuel nozzle can be removed from the fuel tank, the retractable sleeve 30 is extended and repositioned, the insertion section 23 of the fuel filler tube 20 is re-inserted therein, and the plug member 50 plugs the fuel filler tube 20 within the retractable sleeve 30.

In conclusion, the refueling sleeve is used for a refueling gun, fuel oil and oil gas leakage can be avoided in the refueling process, the refueling sleeve is more environment-friendly, the hidden danger of combustion and explosion in the refueling process is eliminated, the safety is ensured, and the refueling sleeve is convenient and practical and has comprehensive functions.

The above description is only an embodiment of the present invention, and not intended to limit the scope of the present invention, and all modifications of equivalent structures and equivalent processes performed by the present specification and drawings, or directly or indirectly applied to other related technical fields, are included in the scope of the present invention.

Claims

1. A fuel filling sleeve is used for a fuel filling gun and is characterized by comprising a fuel filling pipe (20) with an inlet end connected to a gun body (10) of the fuel filling gun for fuel to pass through and a telescopic sleeve (30) sleeved outside the fuel filling pipe (20);

in a rest state, the outlet end of the filler tube (20) is located inside the telescopic sleeve (30);

in the filling state, the telescopic sleeve (30) is compressed, and the outlet end of the filling pipe (20) extends out of the telescopic sleeve (30).

2. The fuel filling sleeve as claimed in claim 1, characterized in that it further comprises a closure (50) mounted on the end of the retractable sleeve (30) remote from the gun body (10);

in the rest state, the closure (50) closes the filler tube (20) within the telescopic sleeve (30);

in the refueling state, the outlet end of the refueling pipe (20) jacks open the plugging piece (50) to extend out of the telescopic sleeve (30).

3. The fuel filling sleeve as claimed in claim 2, wherein the blocking piece (50) comprises a blocking seat (51) and a blocking piece (52), the blocking seat (51) is provided with a channel (53) which penetrates through two ends of the blocking seat and is used for the fuel filling pipe (20), the blocking piece (52) is rotatably arranged in the channel (53) through an elastic resetting piece, and the channel (53) is closed or opened; the end part of the telescopic sleeve (30) is abutted against the plugging seat (51);

in the rest condition, the outlet end of the filler pipe (20) is located inside the passage (53) and inside the closure flap (52), the closure flap (52) closing the passage (53); in the oil filling state, the oil filling pipe (20) pushes the blocking piece (52) open, the blocking piece (52) rotates to open the passage (53), and the outlet end of the oil filling pipe (20) penetrates through the passage (53) and extends out of the blocking seat (51).

4. The fuel filling sleeve as claimed in claim 2, further comprising a first end cap (29) arranged on the periphery of the inlet end of the fuel filling pipe (20), wherein the periphery of the first end cap (29) is provided with an annular step (290), and one end of the retractable sleeve (30) facing the gun body (10) abuts against the annular step (290);

the first end cover (29) is provided with at least one through hole (291), the through hole (291) radially extends through the first end cover (29) and is communicated with the inside of the telescopic sleeve (30); the through hole (291) is provided with a vacuum breaking valve (292) for closing or opening the through hole (291), and the vacuum breaking valve is opened to open the through hole (291) when negative pressure is generated in the telescopic sleeve (30).

5. The refueling cartridge as recited in any one of claims 1 to 4, wherein the retractable sleeve (30) is a resilient metal bellows.

6. The fuel filling sleeve according to any one of claims 1 to 4, wherein the fuel filling pipe (20) comprises a connecting section (20) connected to the gun body (10), an insertion section (21) inserted into the fuel tank, and a bendable section (22) connected between the connecting section (21) and the insertion section (23), the inlet end being located on the connecting section (21) and the outlet end being located on the insertion section (23).

7. The refueling cartridge as recited in claim 6, wherein the refueling pipe (20) is provided with a fuel outlet passage (24) and a self-sealing passage (25) extending axially along the refueling pipe (20) and isolated from each other; the oil outlet channel (24) penetrates through the oil filling pipe (20); the self-sealing channel (25) is cut off from the insertion section (23), and a self-sealing hole (26) which radially penetrates through the self-sealing channel (25) is arranged on the side wall of the insertion section (23).

8. The refueling cartridge as recited in claim 7, wherein a drip-proof check valve (27) is further provided at the outlet end of the refueling pipe (20);

the check valve (27) comprises a base (271), a telescopic elastic piece (272) and a valve plate (273) connected to the base (271) through the elastic piece (272); the valve plate (273) is arranged in the oil outlet channel (24), and the valve plate (273) moves towards the direction close to or far away from the base (271) to control the on-off of the oil outlet channel (24).

9. The fuel filling sleeve as claimed in any of claims 1 to 4, characterized in that it further comprises a protective sleeve (40) surrounding the telescopic sleeve (30), the length of the telescopic sleeve (30) and the fuel filling pipe (20) being greater than the length of the protective sleeve (40);

in the rest state, one end of the telescopic sleeve (30) extends out of the protective sleeve (40);

in the oiling state, the telescopic sleeve (30) is compressed into the protective sleeve (40), so that the outlet end of the oil filling pipe (20) extends out of the telescopic sleeve (30).

10. The refueling cartridge as recited in claim 9, wherein the protective sleeve (40) comprises a tube body (41), and a connector provided at an end of the tube body (41) to be rotatably engaged with the fuel tank cap (60);

the connecting piece comprises a cylinder body (42) axially connected to the end part of the pipe body (41) and a connecting mechanism arranged on the cylinder body (42) and buckled with the oil tank cover (60);

the connecting mechanism comprises a plurality of blocking parts (43) which are rotationally clamped with the clamping pieces (61) on the oil tank cover (60), and the blocking parts (43) are arranged on the end surface of the barrel body (42) far away from the pipe body (41); the blocking parts (43) are distributed at intervals, and gaps (44) for the clamping pieces (61) to penetrate through to enter the cylinder body (42) are formed at intervals among the blocking parts (43); or,

the connecting mechanism comprises threads which are arranged on the inner wall of the cylinder body (62) and matched with the oil tank cover (60).