A fueling gun with oil vapor recovery function

Abstract

The present application relates to a kind of oil gun with oil gas recovery function, comprising: gun body, it includes the liquid passage for oil liquid to pass through and the gas passage for oil gas recovery;Valve assembly is arranged in the valve assembly cavity of gun body, configured to allow or prevent oil liquid to pass through liquid passage and oil gas to pass through gas passage;Drive mechanism is arranged in the drive mechanism cavity of gun body, configured to control the opening or closing of valve assembly;And gun tube assembly is at least partially arranged in the gun tube assembly cavity of gun body, the gun tube assembly includes oil pipe and gas pipe, the oil pipe is configured to accommodate oil liquid to pass through, the gas pipe is at least set outside part of oil pipe, the gap between the oil pipe is configured to accommodate the oil gas to pass through;Wherein, the gas passage of the gun body is communicated with the gap between the gas pipe and the oil pipe.The oil gun of the present application can meet the oil gas recovery function, and also can simplify the structure of gun tube assembly, facilitate the assembly and maintenance of oil gas.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of oil filling equipment, in particular to an oil filling gun with oil gas recovery function. BACKGROUND

[0002] With the development of science and technology and the improvement of living standards, more and more cars enter thousands of households. The continuous increase in the number of cars has led to the continuous expansion of the construction of gas stations. In daily life, gas stations include underground fuel storage tanks and multiple oil filling equipment connected to the fuel storage tanks. Each oil filling equipment fills the oil product into the car through the oil filling gun on it.

[0003] For a long time, the oil vapor generated during the oil filling process will be emitted into the air in or around the gas station. However, the oil products such as gasoline or diesel in the gas station are volatile and have certain toxicity, and the ignition point is also very low, which is easy to be ignited and has safety hazards. With the increasing demand for environmental protection, the requirements for environmental protection and safety of gas stations are also increasing. In order to minimize the oil vapor in and around the gas station, oil gas recovery technology has been popularized, and oil filling guns with oil gas recovery function have been widely used. However, the existing oil filling guns with oil gas recovery function have been developed for a short time, the structure is not reasonable, and the technology is not mature, which makes the structure of the oil filling gun complex and affects the normal use of the oil filling gun. Therefore, the design of a new oil gas recovery oil filling gun has become an urgent need. SUMMARY

[0004] In view of the technical problems existing in the prior art, the present application provides an oil filling gun with oil gas recovery function, which comprises: a gun body comprising a liquid passage for oil to pass through and a gas passage for oil gas to be recovered; a valve assembly arranged in a valve assembly cavity of the gun body and configured to allow or prevent oil to pass through the liquid passage and oil gas to pass through the gas passage; a driving mechanism arranged in a driving mechanism cavity of the gun body and configured to control the opening or closing of the valve assembly; and a gun barrel assembly at least partially arranged in a gun barrel assembly cavity of the gun body, the gun barrel assembly comprising an oil pipe and a gas pipe, the oil pipe being configured to accommodate oil to pass through, and the gas pipe being at least partially arranged outside the oil pipe, and the gap between the gas pipe and the oil pipe being configured to accommodate the oil gas to pass through; wherein the gas passage of the gun body communicates with the gap between the gas pipe and the oil pipe.

[0005] The oil filling gun as described above, wherein the oil pipe comprises a first straight portion, a curved portion, and a second straight portion, and the first straight portion is closer to the gun body than the second straight portion.

[0006] The oil filling gun as described above, wherein the gas pipe is arranged outside the first straight portion of the oil pipe.

[0007] The fueling gun as described above, further comprising a securing device disposed on the fueling tube and configured to secure the fueling gun to a fueling port of a vehicle.

[0008] The fueling gun as described above, wherein the securing device is a spring wrapped at least around the curved portion of the fueling tube.

[0009] The fueling gun as described above, wherein the gun tube assembly further comprises an abrasion resistant layer disposed on the second straight portion of the fueling tube.

[0010] The fueling gun as described above, further comprising a venturi valve coupled to the gun tube assembly and disposed in a cavity of the gun tube assembly.

[0011] The fueling gun as described above, further comprising a vacuum channel coupling the venturi valve to an exterior of the fueling gun and configured to supply gas to the venturi valve, wherein the vacuum channel comprises a first portion disposed in the fueling tube and extending along the fueling tube and a second portion disposed in the gun body.

[0012] The fueling gun as described above, further comprising a vacuum cap disposed in a vacuum cap cavity of the gun body and configured to lock the drive mechanism in an available state, wherein the vacuum cap cavity and the venturi valve are coupled by a gas pressure channel and the vacuum cap and the valve assembly are coupled by an oil pressure channel.

[0013] The fueling gun as described above, wherein the valve assembly cavity and the drive mechanism cavity are on the same axis and the gun tube assembly cavity and the liquid channel are on the same axis.

[0014] The fueling gun of the present application can satisfy the oil and gas recovery function through special structural design, and can also simplify the structure of the gun tube assembly, which is conducive to the assembly and maintenance of the oil and gas. BRIEF DESCRIPTION OF DRAWINGS

[0015] Hereinafter, preferred embodiments of the present application will be described in further detail with reference to the accompanying drawings, in which:

[0016] Figure 1 FIG. 1 is a structural schematic diagram of a fueling gun according to an embodiment of the present application;

[0017] Figure 2 FIG. 2 is a sectional view of the structure of the fueling gun according to an embodiment of the present application;

[0018] Figure 3 FIG. 3 is a schematic diagram of a gun tube assembly according to an embodiment of the present application;

[0019] Figure 4 FIG. 4 is an exploded view of the gun tube assembly according to an embodiment of the present application; and

[0020] Figure 5 A sectional view of a barrel assembly according to an embodiment of the present application. DETAILED DESCRIPTION

[0021] In order to make the objects, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be described clearly and completely below with reference to the accompanying drawings of the embodiments of the present application. Obviously, the described embodiments are some but not all of the embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by a person of ordinary skill in the art without creative work fall within the protection scope of the present application.

[0022] In the following detailed description, reference will be made to the accompanying drawings, which form a part of this description. In the drawings, similar symbols typically identify similar components, unless context dictates otherwise. The illustrative embodiments described in the detailed description are not meant to be limiting in terms of the scope of the application. Other embodiments can be utilized, and other changes can be made, without departing from the scope of the present application.

[0023] A fuel dispenser (may also be referred to as a "dispenser") is connected to a fuel dispenser machine by a hose. Fuel enters the dispenser through the hose, passes through a flow valve and a venturi valve in the dispenser, and exits the barrel to be added to the fuel tank of a vehicle. The flow valve can be controlled to open and close by a trigger on the dispenser through a drive mechanism. A vacuum cap can lock the drive mechanism. In the fuel vapor recovery function, the vapor of the fuel is recovered to the fuel dispenser machine through a gas passage by a gas valve. In the current design of the fuel dispenser, the fuel passage, the vacuum passage and the fuel vapor recovery passage need to be included in the barrel of the fuel dispenser, which leads to a complex structure of the barrel and easily affects the normal use of the fuel dispenser. Moreover, the flow valve, the venturi valve and the gas valve in the fuel dispenser are not reasonably arranged, which causes the flow channel of the fuel to change frequently, the flow environment of the fuel to be complex, the energy of the fuel to be consumed, and the flow rate of the fuel dispenser to be slow. The centralized arrangement of multiple valves also causes problems in assembly and maintenance.

[0024] The present application proposes a completely new design of a fuel dispenser. In the new design, the positions of multiple valves in the fuel dispenser are optimized, and the valves are combined into one whole or separated from each other as much as possible, and the flow channel through which the fuel passes is further optimized, so that the fuel dispenser of the present application has a high flow rate while the structure is more reasonable, the assembly and maintenance of the fuel dispenser are more convenient, and the barrel structure of the fuel dispenser is redesigned, which makes the barrel structure reasonable and does not affect the normal use of the fuel dispenser.

[0025] The technical solutions of the present application will be further described below with specific embodiments. Those skilled in the art should understand that the following description is only for the convenience of understanding the technical solutions of the present application, and should not be used to limit the protection scope of the present application.

[0026] Figure 1 A schematic view of a fueling gun according to an embodiment of the present application. Figure 2 A schematic view of a fueling gun according to an embodiment of the present application.

[0027] As shown in the figure, the fueling gun 100 further comprises a valve assembly 120, a drive mechanism 130, a vacuum cap 140 and a nozzle assembly 150. The valve assembly 120 is arranged between the inlet and the outlet of the gun body 110, and is used to allow or prevent the oil to pass through the gun body 110, and to allow or prevent the oil vapor to pass through the gun body 110 after being recovered. The drive mechanism 130 is connected to the valve assembly 120, and can control the opening and closing of the valve assembly 120, thereby controlling the passage of oil and / or oil vapor. The vacuum cap 140 can be used to lock the drive mechanism 130. When the drive mechanism 130 is in the locked state, the drive mechanism 130 can become an integral whole and be in a usable state. When the drive mechanism 130 is in the unlocked state, the drive mechanism 130 is in a non-usable state and cannot control the opening and closing of the valve assembly 120. The nozzle assembly 150 is arranged at the front of the gun body 110, and can be inserted into the oil tank of a vehicle to add the oil flowing out of the outlet of the gun body into the oil tank of the vehicle.

[0028] In some embodiments, the gun body 110 can include a plurality of chambers for housing the various components of the fuel dispenser, including but not limited to a valve assembly chamber for housing the valve assembly 120, a drive mechanism chamber for housing the drive mechanism 130, a vacuum cap chamber for housing the vacuum cap 140, and a gun barrel assembly chamber for housing at least a portion of the gun barrel assembly 150. In some embodiments, the valve assembly chamber and the drive mechanism chamber are substantially parallel to each other, having substantially the same axis, so that the drive mechanism can control the valve assembly, and thus open or close the valve assembly. Further, the gun barrel assembly chamber is not substantially parallel to the valve assembly chamber and / or the drive mechanism chamber, but is at an angle. In this way, the fuel dispenser does not become too long and cumbersome to use. In some embodiments, the venturi is located in the gun barrel assembly chamber, closer to the gun barrel assembly than to the drive mechanism, and the venturi is not substantially parallel to the drive mechanism.

[0029] In some embodiments, the angle between the axis of the gun barrel assembly chamber and the axis of the valve assembly chamber and / or the drive mechanism chamber can be 150-170 degrees. According to one embodiment of the present application, the angle between the axis of the gun barrel assembly chamber and the axis of the valve assembly chamber and / or the drive mechanism chamber can be 155 degrees. In some embodiments, the angle between the axis of the gun barrel assembly chamber and the axis of the valve assembly chamber and / or the drive mechanism chamber is at a position to the right of the centerline of the vacuum cap chamber or the centerline of the fuel dispenser, that is, the angle between the two axes is closer to the valve assembly chamber, so that after the oil passes through the valve assembly chamber, the oil can change direction, preventing the drive assembly chamber from affecting the flow of oil, increasing the flow area of the oil, and increasing the flow rate of the fuel dispenser. In some embodiments, the flow rate of the fuel dispenser according to the present application can reach 49-50L under a pressure of 1KG.

[0030] In some embodiments, the gun body 110 can further include a liquid passage 104 and a gas passage 105 between the valve assembly chamber and the gun barrel assembly chamber; the liquid passage 104 can define a path for oil to pass through the gun body 110 and into the vehicle tank; and the gas passage 105 can define a path for oil vapor to pass through the gun body 110 and be recovered into the fuel dispenser. In some embodiments, the liquid passage can be on the same axis as the gun barrel assembly chamber, so that the oil can flow smoothly into the gun barrel assembly, avoiding energy loss of the oil, and thus increasing the flow rate of the fuel dispenser.

[0031] In some embodiments, the gun body 110 can further comprise 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 can enter 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 driving mechanism 130, so that it enters the available 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 arranged on the barrel assembly. When the Venturi valve extracts air in the vacuum cap 140 through the air pressure channel 107, the vacuum cap can be separated from the driving mechanism 130, so that the driving mechanism enters the non-available state, so that the driving mechanism cannot drive the valve assembly, the valve assembly is automatically closed, and the "automatic jump gun" of the oil gun is completed.

[0032] In some embodiments, the valve assembly 120 is in the shape of a cylinder as a whole, which comprises an oil passage valve 121 and an air passage valve 122. The oil passage valve 121 is arranged on the liquid channel 104 in the gun body 110, and can be used to control the flow of oil through the gun body 110. The air passage valve 122 is arranged on the gas channel 105 of the gun body 110, and can be used to control the recovery of oil vapor. Of course, as understood by those skilled in the art, the valve assembly 120 can also have other shapes. For example, it can be in the shape of a cone, or a Mongolian yurt, or one or both of the oil passage valve and the air passage valve can be in the shape of a cone or a Mongolian yurt.

[0033] According to an embodiment of the present application, the oil passage valve 121 can be connected with the air passage valve 122 as a whole. In some embodiments, the two can be integrally formed into a valve assembly 120 that can control both the liquid channel and the gas channel. In this way, the opening and closing of the oil passage valve and the air passage valve can be controlled at the same time. In some embodiments, the gas channel is deflected in the valve assembly 120, while the direction of the liquid channel remains substantially unchanged. In some embodiments, further, in the valve assembly 120, the gas channel is located inside the liquid channel, and has a lower impact on the oil flow rate, so that the liquid channel is more likely to occupy a larger cross-sectional area, which is beneficial to improve the oil flow rate.

[0034] In some embodiments, the oil passage valve 121 comprises an oil passage valve seat 1211 and an oil passage valve core 1212. The oil passage valve core 1212 is generally flat, and one end thereof can be coupled with the driving mechanism 130. When the oil passage valve core abuts against the oil passage valve seat, the oil is prohibited from passing through the oil gun. When the driving mechanism 130 pushes the oil passage valve core away from the oil passage valve seat, the oil is allowed to pass through. According to an embodiment of the present application, the oil passage valve further comprises a reset spring 1213, which can be used to reset the oil passage valve core, i.e. to push the oil passage valve core against the oil passage valve seat.

[0035] In some embodiments, the air passage valve 122 comprises an air passage valve seat 1221 and an air passage valve stem 1222; wherein the air passage valve seat 1221 is annular, comprising an outer ring and an inner ring, the outer ring can be used for oil liquid to pass through, and the inner ring can be used for oil liquid vapor to pass through. The air passage valve stem 1222 is arranged in the air passage valve seat after a part of the second end of the air passage valve stem 1222 is reduced in diameter, and can be used for controlling oil liquid vapor to pass through.

[0036] In some embodiments, the first end of the air passage valve stem 1222 is connected with the oil passage valve core 1212, which is beneficial for the driving mechanism 130 to open the oil passage valve 121 and the air passage valve 122 synchronously. In some embodiments, the air passage valve stem 1222 and the oil passage valve core 1212 can be fixedly connected, for example, the oil passage valve core 1212 is directly mounted on the first end of the air passage valve stem 1222, and the first end of the air passage valve stem 1222 is in contact with the driving mechanism 130, so that the valve stem can be pushed by the driving mechanism to open the oil passage valve and the air passage valve synchronously, and when the driving mechanism cannot push the valve stem, the oil passage valve core is pushed by the reset spring to push the air passage valve stem synchronously, so that the oil passage valve and the air passage valve can be closed synchronously, which is beneficial for the assembly of the valve assembly, can make the valve assembly simple in structure, is beneficial for control, and is low in manufacturing cost.

[0037] In some embodiments, the valve assembly 120 can further comprise a positioning ring 123, which can be arranged on the side of the air passage valve away from the oil passage valve, and can be used for limiting the positions of the oil passage valve and the air passage valve. During installation, the oil passage valve 121 and the air passage valve 122 can be pushed and installed into the valve assembly cavity of the gun body 110 by screwing the positioning ring 123, and the positioning ring can further fix the positions of the oil passage valve 121 and the air passage valve 122 to prevent them from moving towards the oil inlet of the gun body 110. In an embodiment, the positioning ring 123 can comprise threads, which can be engaged with the threads of the gun body 110, so as to conveniently realize the installation and positioning of the valve assembly 120.

[0038] In these embodiments of the present application, the valve assembly 120 is cylindrical as a whole, and the air passage valve and the oil passage valve can be connected into a whole through the air passage valve stem. The air passage valve stem can be pushed by the driving mechanism 130 to open the oil passage valve 121 and the air passage valve 122 synchronously, and the valve stem can be pushed by the reset spring to close the oil passage valve 121 and the air passage valve 122 synchronously, so that the oil passage valve and the air passage valve can move uniformly, which ensures that the oil liquid passage can be opened while the oil liquid vapor is recovered, and the oil liquid passage can be closed while the recovery of the oil liquid vapor is stopped.

[0039] In some embodiments, the fueling gun 100 further comprises a trigger 160 outside the gun body 110, which is connected with the driving mechanism 130 through a conversion piece 161, and can be used to control the driving mechanism. In some embodiments, the conversion piece 161 is also outside the gun body, and one end thereof can be connected with the trigger 160. One side or both sides of the gun body 110 comprises an opening 103, and the other end of the conversion piece 161 can be connected with the driving mechanism 130 through the opening 103. In the locked state, when the trigger 160 is pulled, the driving mechanism 130 can be pushed through the conversion piece 161, so as to control the valve assembly 120.

[0040] In some embodiments, the fueling gun can further comprise a guard 164, which can be arranged outside the trigger 160, and is detachably connected with the gun body 110, and can be used to protect the hands during fueling. In some embodiments, the guard 164 comprises one or more pins 165, which are used to engage the trigger 160, so that the operator can fix the trigger 160 during fueling. Correspondingly, the trigger 160 also comprises an engaging structure, which is arranged at the tail of the trigger 160, and can be pushed to be inserted into the pins of the guard 164, so as to provide different flow rates of the fuel.

[0041] The fueling gun of the present application can make the structure of the fueling gun compact, and easy to process and assemble, so as to reduce the manufacturing cost, and effectively improve the flow rate of the fueling gun. However, the current fueling gun has a complex structure, which leads to difficulties in manufacturing and assembling the fueling gun, and difficulties in later maintenance. The reason is that the oil and gas recovery fueling gun needs to meet the functions of fueling, recovering oil and gas, automatically "jumping gun", and facilitating "hanging gun", etc. Therefore, the barrel part of the fueling gun needs to comprise multiple channels and structures.

[0042] There are two main forms of the current fuel gun barrel scheme: scheme one, a plastic inner tube is added in the stainless steel elbow pipe to form the fuel pipe, and a small diameter plastic tube is arranged in the stainless steel elbow pipe as a vacuum channel; the oil is added through the plastic inner tube, and the oil gas is recovered through the space between the stainless steel outer pipe and the plastic fuel inner tube. Scheme two, an aluminum alloy is used to make a sleeve with a horn mouth as an outer pipe, and an oil pipe and a vacuum pipe are arranged on the inner pipe, and the oil gas is recovered through the space between the outer pipe and the inner pipe. However, in scheme one, the diameter of the plastic inner tube is limited by the structure size during use, and a plastic tube with a diameter of about φ10mm can be used at most, which greatly limits the fueling flow rate; and the small diameter plastic tube of the vacuum channel is easily extruded and bent or falls off in the gun barrel during use, causing the fuel gun to be unable to automatically "jump" after being filled with oil, affecting the normal use of the fuel gun. In scheme two, the sleeve of the gun barrel is a horn mouth, and the fuel gun cannot be fixed on the fuel port of the vehicle during fueling, the fixing method is unstable, and the fuel gun is easily detached from the oil tank port of the vehicle when encountering external disturbances during fueling, affecting the environmental protection and safety of the fueling station.

[0043] Therefore, the present application provides a novel fuel gun barrel assembly, which has a simple structure, can increase the width of the oil pipe, can improve the fueling flow rate of the fuel gun, is convenient for assembly and maintenance of the barrel assembly, and is convenient for stable fixation of the fuel gun on the fuel port of the vehicle during fueling.

[0044] Figure 3 FIG. 1 is a schematic diagram of a barrel assembly according to an embodiment of the present application. Figure 4 FIG. 2 is an exploded view of the barrel assembly according to an embodiment of the present application. Figure 5 FIG. 3 is a sectional view of the barrel assembly according to an embodiment of the present application.

[0045] As shown in the figure, the barrel assembly 150 includes an oil pipe 310 and a gas pipe 320. The first end of the oil pipe 310 can be inserted into the oil tank of the vehicle; the gas pipe 320 is at least sleeved on the outside of part of the oil pipe 310, the gap between the gas pipe 320 and the oil pipe 310 can be used for recovering oil vapor, and the gas channel 105 can be in communication with the gap between the gas pipe 320 and the oil pipe 310. In some embodiments, the oil pipe can be made of aluminum profile, and the gas pipe can be made of aluminum alloy.

[0046] In some embodiments, the gas pipe 320 does not extend into the oil tank of the vehicle, so that the diameter of the oil pipe can be increased, and the high-speed fueling capacity can be ensured. In some embodiments, the diameter of the oil pipe can reach 21mm, and the oil gun can ensure high-speed fueling.

[0047] In some embodiments, the oil pipe 310 comprises a first straight section 311, a curved section 312 and a second straight section 313, wherein the first straight section is closer to the gun body 110 than the second straight section, and at least part of the first straight section is arranged in the barrel assembly cavity of the gun body. In some embodiments, the air pipe 320 is sleeved outside the first straight section of the oil pipe 310, so that when the barrel assembly is assembled, the air pipe can be directly sleeved outside the first straight section of the oil pipe, which facilitates the assembly of the barrel assembly and the later maintenance of the barrel assembly.

[0048] In some embodiments, the barrel assembly 150 can further comprise a fixing device 330 arranged on the oil pipe, which can be used to fix the oil gun to the oil filling port of the vehicle when the oil gun is filling oil, and can prevent the oil gun from falling off during oil filling. In some embodiments, the fixing device can be a spring, which can be wound at least on the curved section of the oil pipe 310, so that a plurality of protrusions can be formed on the curved section of the barrel, facilitating the operator to hang the oil gun on the oil filling port of the vehicle, facilitating the operation of the operator, and having good fixing effect on the oil filling port of the vehicle and low cost. In some embodiments, the fixing device can also be other structures, for example, one or more protrusions, materials that can increase the friction of the barrel (such as cloth, rubber pad, etc.).

[0049] In some embodiments, the barrel assembly can further comprise an anti-wear layer 340 arranged outside the second straight section of the oil pipe, which can be used to increase the wear resistance of the second straight section and prevent the barrel of the oil gun from being worn, thereby increasing the service life of the oil gun. In some embodiments, the wear-resistant layer 340 can be a stainless steel sheath, which can be sleeved on the second straight section of the oil pipe to protect the aluminum profile. In some embodiments, the wear-resistant layer can be arranged from the second straight section to the fixing device, and the oil pipe can be protected by the wear-resistant layer and the fixing device.

[0050] In some embodiments, the barrel assembly can also comprise a Venturi valve 350 connected to the barrel assembly and arranged in the barrel assembly cavity, which facilitates the production and assembly efficiency of the oil gun and facilitates the later maintenance and replacement. In some embodiments, the Venturi valve 350 can be connected to the second end of the oil pipe. In some embodiments, the air pipe 320 is fixed outside the oil pipe 310 or the Venturi valve 350. For example, the air pipe 320 is fixed with the valve body of the Venturi valve 350 through threaded connection. In some embodiments, the air pipe can also be fixed with the oil pipe 310 or the Venturi valve 350 in other connection manners, such as welding, clamping or transition assembly.

[0051] In some embodiments, the venturi valve 350 includes a valve seat 351 and a valve core 352, wherein the valve seat is connected to the liquid passage of the gun body 110 at one end and to the oil pipe at the other end. The valve core 352 can act on the valve seat 351 to block the oil from passing through. In some embodiments, the valve seat 351 is a split valve seat, i.e. the valve seat includes multiple split parts. For example, one part is in contact with the valve core and the other part is not in contact with the valve core, and the two parts are connected into one whole through threads. Such a configuration is conducive to the assembly of the venturi valve and facilitates the maintenance and replacement of parts.

[0052] According to one embodiment of the present application, the contact surface between the valve core 352 and the valve seat 351 is a bevel. When the oil pressure forces the valve core away from the valve seat, the oil passing through the valve core 352 will generate a "venturi" effect to form a vacuum. In some embodiments, the valve seat 351 includes one or more vacuum holes 353, which connect the contact area between the valve seat 351 and the valve core 352 to the outside of the valve seat, for supplementing air to compensate for the vacuum formed by the "venturi" effect of the venturi valve and maintain the balance of air pressure.

[0053] In some embodiments, there are two channels for the air supplement of the venturi valve: one is through the air pressure passage 107 from the vacuum cap chamber. The vacuum hole 353 corresponds to the position of the air pressure passage 107 on the gun body 110, which can be connected to the vacuum cap chamber through the air pressure passage 107. The other is through the vacuum passage. The vacuum passage extends along the oil pipe 310, with one end connected to the vacuum hole 353 on the valve seat 351 and the other end connected to the outside along the oil pipe 310. In some embodiments, the vacuum passage is provided on the oil pipe 310 and integrally formed with the oil pipe 310.

[0054] In some embodiments, the barrel assembly can further include a posture device (not shown in the figure) provided in the vacuum passage, which can be provided below the barrel assembly. The posture device can follow the different elevations of the oil gun to make the vacuum passage open or blocked. For example, the posture device can include a steel ball and a plug. The steel ball can reciprocate in part of the vacuum passage (for example, on both sides of the connection between the gun body vacuum passage and the barrel). The cross-sectional area of the vacuum passage where the steel ball moves is larger than that of other parts of the vacuum passage on the gun body, preventing the steel ball from moving to other positions. The plug is provided at the end of the vacuum passage to seal the vacuum passage. When the steel ball moves near the plug, the vacuum passage of the barrel above the steel ball is connected to the vacuum passage on the gun body; when the steel ball moves away from the plug, the vacuum passage of the barrel below the steel ball blocks the vacuum passage. The posture device is provided on the horizontal line of the gun body. When the barrel is raised above the horizontal line, the steel ball blocks the vacuum passage; when the barrel is pressed below the horizontal line, the steel ball connects the vacuum passage.

[0055] Further, the oil pipe 310 can further include a vacuum channel 314, which has the same length as the oil pipe and is arranged at the bottom of the gun pipe and communicates with the vacuum channel of the gun body 110 at one end. In some embodiments, the gun pipe assembly 150 includes a connecting piece 360, which can be used to connect the oil pipe 310 and the air pipe 320. For example, the connecting piece 360 is arranged at the bottom of the gun pipe and the air pipe and penetrates the air pipe and the vacuum channel of the gun pipe. In some embodiments, the connecting piece 360 includes a through hole, which can connect the vacuum channel 314 of the oil pipe and the vacuum channel of the gun body 110. For example, the connecting piece 360 can be a screw including a through hole.

[0056] In some embodiments, the gun pipe assembly 150 can further include a gas hood (not shown in the figure), which can be arranged outside the air pipe and can be attached to the oil filler of the oil tank to prevent oil vapor from overflowing into the air and oil from splashing outside the oil tank. According to an embodiment of the present application, the gas hood can be provided with multiple corrugations, which are beneficial to buffer the force when the oil gun is inserted into the oil tank. According to an embodiment of the present application, the material of the gas hood is flexible or partially flexible. For example: rubber, silicone, plastic, etc.

[0057] The gun pipe of the oil gun of the present application can realize the functions of oil filling, oil vapor recovery, vacuum supplementing, and fixing at the oil filler, and can also increase the diameter of the oil pipe to the maximum, which can effectively ensure the high-speed oil filling capacity, and the structure of the gun pipe assembly is simple, which is convenient for assembly and maintenance.

[0058] The above embodiments are only used to illustrate the present application and are not intended to limit the present application. Those skilled in the art can make various changes and modifications without departing from the scope of the present application. Therefore, all equivalent technical solutions shall belong to the scope of the present application.

Claims

1. A fuel dispenser with vapor recovery function, comprising: a body having a liquid passage for fuel liquid to pass through and a gas passage for fuel vapor to pass through; a valve assembly disposed in a valve assembly cavity of the body, configured to allow or prevent the fuel liquid to pass through the liquid passage and the fuel vapor to pass through the gas passage; a drive mechanism disposed in a drive mechanism cavity of the body, configured to control the opening or closing of the valve assembly; and a nozzle assembly at least partially disposed in a nozzle assembly cavity of the body, the nozzle assembly comprising a liquid tube configured to accommodate the fuel liquid to pass through and a gas tube at least partially sleeved outside the liquid tube, a gap between the liquid tube and the gas tube configured to accommodate the fuel vapor to pass through; wherein the gas passage of the body is in communication with the gap between the liquid tube and the gas tube; wherein the liquid tube comprises a first straight portion, a curved portion and a second straight portion, the first straight portion being closer to the body than the second straight portion, the gas tube being sleeved outside the first straight portion of the liquid tube; a fixing device disposed on the liquid tube and configured to fix the fuel dispenser to a fuel filler of a vehicle; wherein the gas tube does not extend into a fuel tank of the vehicle, the fixing device is a spring at least wound around the curved portion of the liquid tube. The nozzle assembly further comprises an abrasion-resistant layer disposed outside the second straight portion of the liquid tube.

2. The fueling gun of claim 1, wherein, 3. The fuel dispenser of claim 1, further comprising a venturi valve connected to the nozzle assembly and disposed in the nozzle assembly cavity. a vacuum passage in communication with the venturi valve and outside of the fuel dispenser, configured to supply the venturi valve with gas; wherein the vacuum passage comprises a first portion disposed in the liquid tube and extending along the liquid tube and a second portion located in the body.

4. The fueling gun of claim 3, further comprising: a vacuum cap disposed in a vacuum cap cavity of the body, configured to lock the drive mechanism so that the drive mechanism is in an available state; wherein the vacuum cap cavity and the venturi valve comprise a gas pressure passage therebetween and the vacuum cap and the valve assembly comprise an oil pressure passage therebetween.

5. The fueling gun of claim 4, further comprising:

6. The fuel dispenser of claim 1, wherein the valve assembly cavity and the drive mechanism cavity are on the same axis, and the nozzle assembly cavity and the liquid passage are on the same axis. ​

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