Oil gun and gas collecting hood of oil gun

Abstract

The utility model relates to a refueling gun and a gas collecting hood of the refueling gun, the gas collecting hood of the refueling gun comprises a shell, the shell comprises a first opening and a second opening, the peripheral size of the shell is gradually increased from the first opening to the second opening, the first opening is used for being connected with the refueling gun, and the second opening is used for being connected with the gas collecting hood of the refueling gun. The second opening is used for being connected with a vehicle fuel tank opening; and the oil gas recovery regulation and control valve is arranged in the shell, is close to the first opening and is used for regulating and controlling the oil gas channel to recover oil liquid steam. The gas collecting hood is integrated with the oil gas recovery regulation and control valve, so that the oil gun can be compatible for refueling different vehicles, the cost is lowest, and the oil gun and an oil gas recovery system are least changed.

Description

Technical Field

[0001] The utility model relates to the field of refueling equipment, in particular to a refueling gun and a refueling gun air collecting cover. Background Art

[0002] For a long time, the oil vapor generated during the refueling process of vehicles will be emitted into the air in or near the gas station. However, the gasoline or diesel oil at the gas station is volatile and toxic, and the ignition point is very low, which is easy to ignite and poses a safety hazard. With the increasing demand for environmental protection, the requirements for environmental protection and safety of gas stations are also getting higher and higher. In order to minimize the oil vapor in and around gas stations, oil and gas recovery technology has been popularized, and refueling guns with oil and gas recovery function are widely used to meet environmental protection requirements.

[0003] With the further development of vehicle technology, the ORVR (Onboard Refueling Vapor Recovery) on-board refueling oil and gas recovery system has been developed and applied. It is a vehicle emission control system that can collect the oil vapor (also known as "oil and gas") that evaporates from the fuel tank during the refueling process. When the car is refueling, the oil vapor in the fuel tank will be absorbed by a carbon canister with an adsorption effect, so that no oil vapor will be dispersed into the air of the gas station, and there is no need for a refueling gun to recover the oil vapor. This results in the above-mentioned two different vehicles being refueled, and the current refueling gun or oil and gas recovery system is difficult to be compatible with and regulate the oil and gas recovery of the two different vehicles. Utility Model Content

[0004] In view of the technical problems existing in the prior art, the utility model proposes a gas collecting hood for a refueling gun, comprising: an outer shell, which comprises a first opening and a second opening, the outer size of the outer shell gradually increases from the first opening to the second opening, the first opening is used to be connected to the refueling gun, and the second opening is used to be connected to the vehicle's fuel tank port; and an oil and gas recovery control valve, which is arranged in the outer shell and close to the first opening, and is used to regulate the oil and gas channel to recover oil vapor.

[0005] The gas collecting hood of the refueling gun as described above further includes: a sealing plate, which is arranged at the second opening of the outer shell and fixedly connected to the outer shell, and is used to seal the vehicle refueling port when the vehicle is refueling. The sealing plate includes an opening, which is used to accommodate the passage of the refueling gun oil pipe and / or the passage of oil vapor.

[0006] The gas collecting hood of the fuel gun as described above, wherein the sealing sheet has an arc-shaped surface on one side close to the vehicle fuel tank opening.

[0007] As described above, the gas collecting hood of the refueling gun, the oil and gas recovery control valve includes: a valve seat, a valve core and a connecting sleeve, wherein the first end of the connecting sleeve is connected to the valve seat, and the second end is connected to the first opening of the shell, and the valve core is arranged in the connecting sleeve and moves between a first position and a second position.

[0008] As described above, the gas gun air collecting cover, the valve seat includes one or more through holes, which are used to accommodate oil vapor to enter the connecting sleeve. When the valve core is located in a first position, the oil vapor can enter the connecting sleeve through the valve seat. When the valve core is located in a second position, the oil vapor cannot enter the connecting sleeve through the valve seat.

[0009] As described above, the gas collecting hood of the refueling gun, the oil and gas recovery control valve also includes: one or more guide columns, one end of which is connected to the through hole and the other end is against the valve core, and the guide column can move in the through hole following the valve core.

[0010] In the gas collecting cover of the fuel gun as described above, the valve core includes: one or more grooves, which are used to accommodate at least part of the guide column.

[0011] As for the gas collecting hood of the refueling gun as described above, the oil and gas recovery control valve also includes: a reset device, which is sleeved on the guide column and abuts against the valve seat, and is used for restoring the valve core from the second position to the first position.

[0012] The gas collecting hood of the refueling gun as described above further includes: one or more air vents, which penetrate the outer shell and the connecting sleeve, and the valve core includes one or more air supply channels. When the valve core is located in the second position, the air vents are connected to the air supply channels, and external gas is added to the oil and gas channel.

[0013] According to another aspect of the present application, a refueling gun is proposed, comprising: the refueling gun air collecting hood as described above, which is sleeved on the gun barrel of the refueling gun and connected to the air pipe of the refueling gun.

[0014] The gas collecting hood of the present application integrates an oil and gas recovery control valve, which can make the fuel gun compatible with refueling different vehicles, with the lowest cost and the least changes to the fuel gun and the oil and gas recovery system. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Below, the preferred embodiments of the present invention will be further described in detail with reference to the accompanying drawings, wherein:

[0016] Figure 1 A schematic diagram of a refueling gun according to an embodiment of the present application;

[0017] Figure 2 A cross-sectional view of a fuel gun according to an embodiment of the present application;

[0018] Figure 3 A schematic diagram of a gas collecting hood according to an embodiment of the present application;

[0019] Figure 4 An exploded view of a gas collecting hood according to an embodiment of the present application;

[0020] Figure 5A and Figure 5B is a cross-sectional view of an air collecting hood according to an embodiment of the present application;

[0021] Figure 6 A schematic diagram of a gas collecting hood according to an embodiment of the present application;

[0022] Figure 7 An exploded view of a gas collecting hood according to an embodiment of the present application; and

[0023] Fig. 8A and Figure 8B It is a cross-sectional view of an air collecting hood according to one embodiment of the present application. DETAILED DESCRIPTION

[0024] In order to make the purpose, technical solution and advantages of the embodiment of the utility model clearer, the technical solution in the embodiment of the utility model will be clearly and completely described below in conjunction with the drawings in the embodiment of the utility model. Obviously, the described embodiment is a part of the embodiment of the utility model, not all of the embodiments. Based on the embodiment of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0025] In the following detailed description, reference may be made to the various specification drawings that are part of the present application and are used to illustrate specific embodiments of the present application. In the accompanying drawings, similar reference numerals describe substantially similar components in different figures. The various specific embodiments of the present application are described below in sufficient detail so that a person of ordinary skill in the art with relevant knowledge and skills in the art can implement the technical solutions of the present application. It should be understood that other embodiments may also be used or structural, logical or electrical changes may be made to the embodiments of the present application.

[0026] At present, in order to meet the requirements of GB18352.6-2016 Light Vehicle Pollutant Emission Limits and Measurement Methods, the refueling guns at gas stations generally have an oil and gas recovery function to recover the oil vapor generated by the vehicle during the refueling process. However, with the update of vehicle technology, some vehicles are currently equipped with ORVR, and the vehicle will not overflow oil vapor during the refueling process. For such vehicles, the refueling gun does not need to recover oil vapor during the refueling process. This leads to two completely different refueling situations, and the current refueling guns or gas station oil and gas recovery systems are not compatible with the above two situations.

[0027] And with the increase in ORVR vehicles, more and more regional landmarks require gas stations to install oil and gas recovery systems that are compatible with ORVR vehicles. In other words, they must clearly have oil and gas recovery systems that adapt to the characteristics of ORVR vehicles.

[0028] The present application proposes a gas collecting hood for a refueling gun, which has an oil and gas recovery control valve integrated therein, and can regulate and control the oil and gas channel of the refueling gun. When refueling a traditional vehicle, the oil and gas recovery control valve controls the connection of the oil and gas channel to recover the oil vapor generated by refueling; when refueling an ORVR vehicle, the oil and gas recovery control valve can regulate and control the oil and gas channel, and can control the oil and gas channel not to recover oil vapor, shut down the oil and gas recovery system, or regulate the oil and gas channel and add external gas to make the oil and gas recovery system work normally, thereby being compatible with the refueling conditions of different vehicles.

[0029] The technical solution of the utility model is further described below by specific embodiments. Those skilled in the art should understand that, under the enlightenment of the following embodiments, there may still be other alternatives that can achieve the same or similar functions. These alternatives are also within the protection scope of the utility model.

[0030] Figure 1 It is a schematic diagram of a refueling gun according to an embodiment of the present application. Figure 2 It is a cross-sectional view of a fuel gun according to one embodiment of the present application.

[0031] As shown in the figure, the refueling gun 100 includes a gun body 110, which includes an oil inlet 101 and an oil outlet 102. The oil inlet 101 can be connected to a hose through an inlet thread, and then the oil gun can be connected to a refueling machine. The oil of the refueling machine enters the gun body from the oil inlet, and then flows out of the gun body from the oil outlet. According to one embodiment of the present application, the gun body 110 can be cast. According to one embodiment of the present application, the material of the gun body 110 is a metal or alloy such as aluminum and stainless steel.

[0032] As shown in the figure, the refueling gun 100 also includes a valve assembly 120, a drive mechanism 130, a vacuum cap 140 and a barrel assembly 150 arranged between the oil inlet and the oil outlet of the gun body 110. The valve assembly 120 is used to allow or prevent the oil from passing through the gun body 110, and to allow or block the oil vapor from passing through the gun body 110 after recovery. The drive mechanism 130 is connected to the valve assembly 120 to control the on and off of the valve assembly 120, thereby controlling the passage of the oil and / or oil vapor. The vacuum cap 140 is used to lock the drive mechanism 130. When the drive mechanism 130 is in a locked state, the drive mechanism 130 becomes a whole and is in an available state. When the drive mechanism 130 is in an unlocked state, the drive mechanism 130 is unavailable and cannot control the opening and closing of the valve assembly 120. The barrel assembly 150 is arranged at the front of the gun body 110, and can be inserted into the fuel tank of the vehicle to add oil thereto. In some embodiments, the barrel assembly includes an oil pipe and an air pipe. The oil pipe can be used to accommodate oil passing through, and the air pipe is at least partially sleeved outside the oil pipe. The gap between the air pipe and the oil pipe can be used to accommodate oil and gas passing through, thereby entering the gun body 110.

[0033] In some embodiments, the gun body 110 also includes multiple chambers for accommodating the above-mentioned components of the refueling gun, including but not limited to: a valve assembly chamber for accommodating the valve assembly 120, a drive mechanism chamber for accommodating the drive mechanism 130, a vacuum cap chamber for accommodating the vacuum cap 140, and a barrel assembly chamber for accommodating at least part of the barrel assembly 150.

[0034] In some embodiments, the gun body 110 may also include a liquid channel 104 and a gas channel 105 between the valve assembly cavity and the barrel assembly cavity; wherein the oil channel 104 defines a passage for the oil to enter the vehicle tank through the gun body 110; and the gas channel 105 defines a passage for the oil vapor to be recovered to the fuel dispenser through the gun body 110.

[0035] In some embodiments, the gun body 110 may further include an oil pressure channel 106 between the valve assembly chamber and the vacuum cap chamber and an air pressure channel 107 between the vacuum cap chamber and the barrel assembly chamber. Oil enters the vacuum cap 140 through the oil pressure channel 106, and the oil pressure provided by the oil can push the vacuum cap 140 to lock the drive mechanism 130, so that it enters a usable state. One end of the air pressure channel 107 is connected to the vacuum cap chamber, and the other end is connected to the venturi valve. When the venturi valve extracts air from the vacuum cap 140 through the air pressure channel 107, the vacuum cap can be separated from the drive mechanism 130, so that it enters a non-usable state.

[0036] In some embodiments, the fueling gun 100 further includes a trigger 160 located outside the gun body 110, which is connected to the drive mechanism 130 through a conversion member and can be used to control the drive mechanism. In some embodiments, the conversion member can be located outside the gun body, and one end of the conversion member is connected to the trigger 160. One side or both sides of the gun body 110 include an opening, and the other end of the conversion member is connected to the drive mechanism 130 through the opening. In the locked state, when the trigger 160 is pulled, the drive mechanism 130 can be pushed via the conversion member, thereby controlling the valve assembly 120.

[0037] In some embodiments, the refueling gun may further include a guard bow 164, which is disposed on the outside of the trigger 160 and is detachably connected to the gun body 110 to protect the hands when refueling. In some embodiments, the guard bow 164 includes one or more pins 165, which are used to clamp the trigger 160, so that the operator can fix the trigger 160 when refueling. Correspondingly, the trigger 160 also includes a clamping structure, which is disposed at the tail of the trigger 160 and can be pushed and inserted into each pin of the guard bow 164, thereby providing different oil flow rates.

[0038] In some embodiments, the refueling gun 100 may further include an air collecting hood 180, which is disposed on the gun barrel assembly 150, specifically sleeved outside the air pipe, and can be used to seal the refueling port of the vehicle when refueling the vehicle, so that the oil and gas can enter the gap between the oil pipe and the air pipe through the air collecting hood, and then enter the oil and gas channel of the gun body, thereby preventing the oil and gas from leaking outside the gas station. In some embodiments, the air collecting hood 180 may be integrated with an oil and gas recovery control valve, which can adjust and control the oil and gas to enter the gap between the oil pipe and the air pipe.

[0039] The gas collecting hood structure of the fueling gun of the present application will be described in detail below.

[0040] Embodiment 1: The oil and gas recovery control valve is a switch valve, which can control the opening or closing of the oil and gas channel.

[0041] Figure 3 Schematic diagram of an air collecting hood according to an embodiment of the present application. Figure 4 The figure is an exploded view of an air collecting hood according to an embodiment of the present application. Figure 5A and Figure 5B It is a cross-sectional view of an air collecting hood according to one embodiment of the present application. Figure 5A and Figure 5B Two different working states of the gas collecting hood are shown respectively.

[0042] As shown in the figure, the gas collecting hood of the fuel gun (hereinafter referred to as "gas collecting hood") 300 may include: a housing 310 and an oil and gas recovery switch valve 320. The oil and gas recovery switch valve 320 is arranged in the housing 310 and can be used to control the oil and gas to enter the fuel gun through the gas collecting hood.

[0043] In some embodiments, the shape of the shell 310 is similar to a cone, and includes a first opening 311 and a second opening 312, and the outer size of the shell 310 gradually increases from the first opening 311 to the second opening 312. Among them, the first opening 311 can be used to connect with the refueling gun, which can be directly set on the air pipe of the barrel assembly, and the second opening 312 is used to connect with the fuel tank port of the vehicle, and the fuel tank port of the vehicle can be covered. In some embodiments, the shell 310 can also include one or more corrugations 313. It is located between the first opening 311 and the second opening 312, so that the gas collecting hood can be suitable for the fuel tank ports of vehicles of different models. During the refueling process, the shell of the gas collecting hood can be compressed on the fuel tank port of the vehicle. In some embodiments, the direction of corrugation propagation is perpendicular to the axial direction of the shell (or the barrel assembly), which is conducive to the shrinkage deformation of the shell under axial pressure during the refueling process, and is also conducive to the production process demoulding action during the production of the gas collecting hood, thereby reducing the production cost of the gas collecting hood. In some embodiments, the outer shell can be made of rubber, polyurethane, nitrile rubber or fluororubber, which is beneficial for the outer shell to retract under pressure when the vehicle is refueled.

[0044] In some embodiments, the gas collecting hood 300 may further include a sealing sheet 330, which may be disposed at the second opening 312 of the housing, and when the vehicle is refueling, may be pressed against the fuel tank opening of the vehicle, thereby sealing the fuel tank opening of the vehicle to prevent oil and gas from leaking out of the gas station. In some embodiments, the sealing sheet may be made of rubber, polyurethane, nitrile rubber, or fluororubber, which is beneficial for the sealing sheet to seal the fuel tank opening when the vehicle is refueling.

[0045] In certain embodiments, the sealing sheet 330 includes an opening 331, which is located near the center of the sealing sheet, and can be used to accommodate the oil pipe of the barrel assembly to pass through. The sealing sheet is worn on the oil pipe and is fixedly connected to the second opening 312 of the shell. In certain embodiments, the size of the opening 331 is slightly larger than the size of the oil pipe, which is conducive to the oil and gas in the vehicle fuel tank entering the gas collecting hood. In certain embodiments, the sealing sheet can be connected to the shell using an adhesive process. Of course, as those skilled in the art will appreciate, other connection methods can also be applied to the technical solutions of the present application. For example: by snap-fit ​​connection, etc. In certain embodiments, the sealing sheet is close to one side of the vehicle fuel tank port for an arc-shaped surface that is approximately spherical, which is conducive to adapting to the fuel tank ports of different vehicles and can be effectively sealed.

[0046] In some embodiments, the oil and gas recovery switch valve 320 is arranged at the housing near the first opening 311, that is, the connection between the housing and the barrel assembly, and can be used to control whether to allow or prevent the oil and gas passage of the refueling gun from recovering oil vapor. In some embodiments, the oil and gas recovery switch valve 320 includes: a valve seat 321, a valve core 322 and a connecting sleeve 323, wherein the valve seat 321 is arranged in the connecting sleeve and connected to the first end of the connecting sleeve 323, the valve core 322 is arranged in the connecting sleeve 323 and moves between a first position and a second position, and the second end of the connecting sleeve 323 is connected to the first opening of the housing and the air pipe.

[0047] In some embodiments, the valve seat is annular and includes one or more through holes 3211 thereon, which can be used to accommodate the oil vapor to enter the connecting sleeve, so that the oil vapor can enter the oil and gas channel of the refueling gun. In some embodiments, the valve seat can be connected to the first end of the connecting sleeve by an interference fit. As understood by those skilled in the art, other connection methods in the art can also be applied to the technical solution of the present application. For example: threaded connection, etc.

[0048] In some embodiments, the valve core 322 is cylindrical, and its first end includes an end surface 3221, which has a shape and size substantially the same as that of the valve seat and can be used to block the through hole of the valve seat. Figure 5A and Figure 5B When the valve core is in the first position, the end face 3221 is away from the valve seat, and the oil vapor can enter the connecting sleeve through the valve seat; when the valve core is in the second position, the end face 3221 is close to the valve seat, and the oil vapor cannot enter the connecting sleeve through the valve seat. In some embodiments, the second end of the valve core includes a step surface 3222, which can abut against the end surface of the air pipe and can limit the position of the valve core. When the valve core is in the first position, the step surface of the second end can abut against the end surface of the air pipe. In some embodiments, the outer side surface of the valve core is in clearance with the connecting sleeve to facilitate the axial sliding of the valve core in the connecting sleeve.

[0049] In some embodiments, the connecting sleeve 323 includes one or more connecting holes 3231, which can be used to fix the switch valve on the gun barrel by screws. In some embodiments, the connecting hole 3231 runs through the shell, or is connected to the connecting hole on the shell, so that the shell and the switch valve can be fixed on the gun barrel by the same screw. In some embodiments, the inner wall of the connecting sleeve 323 includes one or more sealing grooves 3232, which can be used to install a sealing ring, can seal the connecting sleeve and the outside of the air pipe, and prevent oil and gas from overflowing from the gap between the connecting sleeve and the air pipe. In some embodiments, the side wall of the connecting sleeve can also include one or more vents 3233, which can be used to connect the switch valve and the external atmospheric environment, which is conducive to balancing the air pressure in the switch valve. When the valve core moves, the air pressure in the switch valve will change. The vent can be used to balance the air pressure difference on both sides of the valve core, which can ensure that the valve core moves more freely. In some embodiments, the vent 3233 runs through the shell, or is connected to the vent on the shell. In some embodiments, the vent hole 3233 may further include an adjustment structure (not shown in the figure), which can adjust the size of the vent hole opening, thereby adjusting the response sensitivity of the valve core under the action of vacuum.

[0050] In some embodiments, the oil and gas recovery switch valve 320 further includes: one or more guide posts 324, one end of which is connected to the through hole 3211 of the valve seat, and the other end abuts against the end surface of the valve core 322. The guide posts can move in the through hole following the valve core, and can be used to guide the movement of the valve core. In some embodiments, the valve core 322 further includes: one or more grooves 3223, which are arranged on the first end of the valve core and can be used to accommodate part of the guide posts. The guide posts abut against the grooves 3223, which can limit the position of the valve core and prevent the valve core from rotating during the movement.

[0051] In some embodiments, the axial cross-section of the guide column is T-shaped, and includes a first part and a second part, wherein the first part and the second part are vertically connected, the first part can be connected to the through hole, and the second part can be clamped with the reset device 325 of the oil and gas recovery switch valve sleeved on the first part. In some embodiments, the reset device can be a reset spring, which is sleeved on the guide column, one end of which is clamped with the first part of the guide column, and the other end of which is clamped with the valve seat, and can be used to restore the valve core from the second position to the first position.

[0052] The gas collecting hood of the present application is set on the fueling gun. When the fueling gun is refueling non-ORVR models, the volatile oil and gas in the fuel tank can be pumped back to the underground storage tank by the vacuum pump through the gas collecting hood, the fuel gun, and the return air passage of the hose. The static pressure will be lost in the process of oil and gas flowing through the fuel gun, forming a certain degree of vacuum, which is overcome by the elastic force of the return spring to keep the valve core in the open state.

[0053] When the fuel gun is refueling a vehicle with an ORVR device, the fuel tank port and the gun barrel are in a sealed state, and the oil and gas in the fuel tank cannot be extracted by the oil and gas recovery system. At the same time, because the gas collecting cover of the fuel gun and the fuel tank port are closely matched, the oil and gas recovery system will create a vacuum in the entire return air passage. At the same time, the air vent on the side of the gas collecting cover is connected to the outside normal pressure atmosphere, forming a pressure difference on both sides of the valve core of the switch valve, causing the valve core to move to the vacuum side, sealing the valve core at the through hole of the valve seat, thereby closing the oil and gas passage and reducing the gas-liquid ratio of the oil and gas recovery system. When refueling is finished, the fuel gun is removed from the fuel tank port, and the oil and gas recovery system stops running. The vacuum in the oil and gas passage disappears, and the valve core returns to its original position under the action of the reset spring.

[0054] Embodiment 2: The oil and gas recovery control valve is a balancing valve, which can control whether external gas is added to the oil and gas channel and can regulate the oil and gas channel.

[0055] Figure 6 Schematic diagram of an air collecting hood according to an embodiment of the present application. Figure 7 The figure is an exploded view of an air collecting hood according to an embodiment of the present application. Fig. 8A and Figure 8B It is a cross-sectional view of an air collecting hood according to one embodiment of the present application. Fig. 8A and Figure 8B Two different working states of the gas collecting hood are shown respectively.

[0056] As shown in the figure, the gas collecting hood of the fuel gun (hereinafter referred to as "gas collecting hood") 600 may include: a housing 610 and an oil and gas recovery balance valve 620. The oil and gas recovery balance valve 320 is arranged in the housing 610 and can be used to control the oil and gas to enter the fuel gun through the gas collecting hood.

[0057] In some embodiments, the shape of the shell 610 is similar to a cone, and includes a first opening 611 and a second opening 612, and the outer size of the shell 610 gradually increases from the first opening 611 to the second opening 612. Among them, the first opening 611 can be used to connect with the refueling gun, which can be directly set on the air pipe of the barrel assembly, and the second opening 612 is used to connect with the fuel tank port of the vehicle, and the fuel tank port of the vehicle can be covered. In some embodiments, the shell 310 can also include one or more corrugations 613. It is located between the first opening 611 and the second opening 612, so that the gas collecting hood can be suitable for the fuel tank ports of vehicles of different models. During the refueling process, the shell of the gas collecting hood can be compressed on the fuel tank port of the vehicle. In some embodiments, the direction of the corrugation propagation is perpendicular to the axial direction of the shell (or the barrel assembly), which is conducive to the shrinkage deformation of the shell under axial pressure during the refueling process, and is also conducive to the production process demoulding action during the production of the gas collecting hood, thereby reducing the production cost of the gas collecting hood. In some embodiments, the outer shell can be made of rubber, polyurethane, nitrile rubber or fluororubber, which is beneficial for the outer shell to retract under pressure when the vehicle is refueled.

[0058] In some embodiments, the gas collecting hood 600 may further include a sealing sheet 630, which may be disposed at the second opening 612 of the housing, and when the vehicle is refueling, may be pressed against the fuel tank opening of the vehicle, thereby sealing the fuel tank opening of the vehicle to prevent oil and gas from leaking out of the gas station. In some embodiments, the sealing sheet may be made of rubber, polyurethane, nitrile rubber, or fluororubber, which is beneficial for the sealing sheet to seal the fuel tank opening when the vehicle is refueling.

[0059] In certain embodiments, the sealing sheet 630 includes an opening 631, which is located near the center of the sealing sheet, and can be used to accommodate the oil pipe of the barrel assembly to pass through. The sealing sheet is worn on the oil pipe and is fixedly connected to the second opening 612 of the shell. In certain embodiments, the size of the opening 631 is slightly larger than the size of the oil pipe, which is conducive to the oil and gas in the vehicle fuel tank entering the gas collecting hood. In certain embodiments, the sealing sheet can be connected to the shell using an adhesive process. Of course, as those skilled in the art will appreciate, other connection methods can also be applied to the technical solutions of the present application. For example: by snap-on connection, etc. In certain embodiments, the sealing sheet is close to one side of the vehicle fuel tank port for an arc-shaped surface that is approximately spherical, which is conducive to adapting to the fuel tank ports of different vehicles and can be effectively sealed.

[0060] In some embodiments, the oil and gas recovery balance valve 620 is arranged at the housing near the first opening 611, that is, the connection between the housing and the barrel assembly, and can be used to control whether it is necessary to add external gas to the oil and gas channel so that the oil and gas recovery system can work normally. In some embodiments, the oil and gas recovery balance valve 620 includes: a valve seat 621, a valve core 622 and a connecting sleeve 623, wherein the valve seat 621 is arranged in the connecting sleeve and connected to the first end of the connecting sleeve 623, the valve core 322 is arranged in the connecting sleeve 623, and moves between the first position and the second position, and the second end of the connecting sleeve 623 is connected to the first opening of the housing and the air pipe.

[0061] In some embodiments, the valve seat is annular and includes one or more through holes 6211 thereon, which can be used to accommodate the oil vapor to enter the connecting sleeve, so that the oil vapor can enter the oil and gas channel of the refueling gun. In some embodiments, the valve seat can be connected to the first end of the connecting sleeve by an interference fit. As understood by those skilled in the art, other connection methods in the art can also be applied to the technical solution of the present application. For example: threaded connection, etc.

[0062] In some embodiments, the valve core 622 is cylindrical, and its first end includes an end surface 6221, which is substantially the same in shape and size as the valve seat. In some embodiments, the second end of the valve core includes a step surface 6222, which can abut against the end surface of the trachea, and can limit the position of the valve core. When the valve core is in the first position, the step surface of the second end can abut against the end surface of the trachea. In some embodiments, the outer side surface of the valve core is in clearance with the connecting sleeve, so that the valve core can slide axially in the connecting sleeve.

[0063] In some embodiments, the valve core 622 may further include one or more air supply channels 6223, which are disposed on the valve core side wall step surface 6222 and penetrate the side wall of the valve core, and may be used to supply external gas to the oil and gas channel. In some embodiments, the air supply channel may include one or more air holes. Fig. 8A and Figure 8B When the valve core is in the first position, the end face 6221 is away from the valve seat, and the oil vapor can enter the connecting sleeve through the valve seat; when the valve core is in the second position, the end face 6221 is close to the valve seat, and the air supply channel 6223 can supply external gas into the oil and gas channel.

[0064] In some embodiments, the connecting sleeve 623 includes one or more connecting holes 6231, which can be used to fix the balance valve on the gun barrel by screws. In some embodiments, the connecting hole 6231 runs through the shell, or is connected to the connecting hole on the shell, so that the shell and the balance valve can be fixed to the gun barrel by the same screw. In some embodiments, the inner wall of the connecting sleeve 623 includes one or more sealing grooves 6232, which can be used to install a sealing ring, which can seal the connecting sleeve and the outside of the air pipe to prevent oil and gas from overflowing from the gap between the connecting sleeve and the air pipe. In some embodiments, the side wall of the connecting sleeve may also include one or more vents 6233, which can be used to replenish external gas into the oil and gas channel. When the valve core is in the second position, the air replenishment channel on the valve core coincides with the position of the vent, and external air can be replenished into the connecting sleeve, so that external air can enter the oil and gas channel. In some embodiments, the vent 6233 runs through the shell, or is connected to the vent on the shell. In some embodiments, the vent hole 6233 may further include an adjustment structure (not shown in the figure), which can adjust the size of the vent hole opening, thereby adjusting the response sensitivity of the valve core under the action of vacuum.

[0065] In some embodiments, the oil and gas recovery balancing valve 320 further includes: one or more guide posts 624, one end of which is connected to the through hole 6211 of the valve seat, and the other end abuts against the end surface of the valve core 622. The guide posts can move in the through hole following the valve core, and can be used to guide the movement of the valve core. In some embodiments, the valve core 622 further includes: one or more grooves 6224, which are arranged on the first end of the valve core and can be used to accommodate part of the guide posts. The guide posts abut against the grooves 6224, and can limit the position of the valve core to prevent the valve core from rotating during the movement.

[0066] In some embodiments, the axial cross-section of the guide column is T-shaped, and includes a first part and a second part, wherein the first part and the second part are vertically connected, the first part can be connected to the through hole, and the second part can be clamped with the reset device 625 of the oil and gas recovery balance valve sleeved on the first part. In some embodiments, the reset device can be a reset spring, which is sleeved on the guide column, one end of which is clamped with the first part of the guide column, and the other end of which is clamped with the valve seat, and can be used to restore the valve core from the second position to the first position.

[0067] The gas collecting hood of the present application is set on the refueling gun. When the refueling gun is refueling a non-ORVR vehicle, the volatile oil and gas in the fuel tank can be pumped back to the underground storage tank by the vacuum pump through the oil gun, the balance valve, and the return air passage of the hose. The static pressure will be lost in the process of oil and gas flowing through the oil gun, forming a certain degree of vacuum. This part of the vacuum is overcome by the elastic force of the spring to keep the valve core in an open state. In this process, the oil and gas recovery system only inhales the gasoline vapor discharged from the fuel tank.

[0068] When the oil gun is refueling a vehicle with ORVR, the oil tank port and the gun barrel are in a sealed state, and the oil and gas in the oil tank cannot be extracted by the oil and gas recovery system. At the same time, because the oil gun's gas collecting cover and the oil tank port are closely matched, the oil and gas recovery system will create a vacuum in the entire return air passage. At the same time, the air vent on the side of the air collecting cover is connected to the external normal pressure atmospheric environment, forming a pressure difference on both sides of the valve core of the balance valve, causing the valve core to move toward the vacuum side, sliding the valve core toward the valve seat, thereby connecting the valve core's air supply channel with the connecting sleeve and the air vent of the gas collecting cover, allowing the oil and gas recovery system to inhale air from the external environment, avoiding excessive load on the vacuum pump, and maintaining the normal operation of the oil and gas recovery system. When refueling is finished, the oil gun is removed from the oil tank port, and the oil and gas recovery system stops running. The vacuum in the return air passage disappears, and the valve core returns to its original position under the action of the reset spring.

[0069] The gas hood of the fuel gun of the present application is low-cost and requires few changes to the fuel gun and the oil and gas recovery system. The gas hood can be quickly replaced for fuel guns of the same interface size to achieve the function of adapting to ORVR; it can be compatible with the oil and gas recovery during the refueling process of ORVR vehicles and non-ORVR vehicles; and the gas hood of the present application can form an effective seal with the fuel tank port to prevent oil and gas from overflowing; the corrugated structure is compressed when the fuel gun is hung on the fuel tank port, and at the same time it will provide resilience to the fuel gun, and cooperate with the protrusion on the gun barrel to make the gun firmly buckled on the fuel tank port; it is easier to produce, has a stronger adaptability to the fuel tank port, and is conducive to the sealing of the fuel gun at the fuel tank port.

[0070] The above embodiments are only used to illustrate the present invention, but not to limit the present invention. Ordinary technicians in the relevant technical field can make various changes and modifications without departing from the scope of the present invention. Therefore, all equivalent technical solutions should also fall within the scope of the present invention.

Claims

1. A gas collecting hood for a refueling gun, characterized in that: include: A housing, comprising a first opening and a second opening, wherein the outer dimensions of the housing gradually increase from the first opening to the second opening, wherein the first opening is used to be connected to a refueling gun, and the second opening is used to be connected to a fuel tank port of a vehicle; and An oil and gas recovery control valve is arranged in the housing and close to the first opening, and is used for regulating the oil and gas channel to recover oil vapor.

2. The gas collecting cover of the fuel gun according to claim 1, characterized in that: Further including: A sealing sheet is arranged at the second opening of the shell and fixedly connected to the shell, and is used to seal the vehicle refueling port when the vehicle is refueling. The sealing sheet includes an opening, which is used to accommodate the passage of the refueling gun oil pipe and / or the passage of oil vapor.

3. The gas collecting cover of the fuel gun according to claim 2, characterized in that: The sealing sheet has an arc-shaped surface on one side close to the vehicle fuel tank opening.

4. The gas collecting cover for a refueling gun according to claim 1, characterized in that: The oil and gas recovery control valve includes: a valve seat, a valve core and a connecting sleeve, wherein the first end of the connecting sleeve is connected to the valve seat, and the second end is connected to the first opening of the shell, and the valve core is arranged in the connecting sleeve and moves between a first position and a second position.

5. The gas collecting cover for a refueling gun according to claim 4, characterized in that: The valve seat includes one or more through holes, which are used to accommodate oil vapor entering the connecting sleeve. When the valve core is located in a first position, oil vapor can enter the connecting sleeve through the valve seat. When the valve core is located in a second position, oil vapor cannot enter the connecting sleeve through the valve seat.

6. The gas collecting cover for a refueling gun according to claim 5, characterized in that: The oil and gas recovery control valve further includes: one or more guide posts, one end of which is connected to the through hole and the other end of which is pressed against the valve core. The guide posts can move in the through hole following the valve core.

7. The gas collecting cover for a refueling gun according to claim 6, characterized in that: The valve core includes: one or more grooves, which are used to accommodate at least part of the guide column.

8. The gas collecting cover for a refueling gun according to claim 6, characterized in that: The oil and gas recovery control valve also includes: a reset device, which is sleeved on the guide column and abuts against the valve seat, and is used for restoring the valve core from the second position to the first position.

9. The gas collecting cover for a refueling gun according to claim 4, characterized in that: Further including: One or more vent holes penetrate through the shell and the connecting sleeve. The valve core includes one or more air supply channels. When the valve core is located at the second position, the vent holes are connected to the air supply channels, and external gas is supplied to the oil and gas channel.

10. A refueling gun, characterized in that: include: The gas collecting hood for a refueling gun as described in any one of claims 1 to 9 is sleeved on the barrel of the refueling gun and connected to the air pipe of the refueling gun.

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