A fuel gun

Abstract

The present invention relates to a fuel gun, which comprises: a gun body including a liquid passage for supplying a liquid to pass through; a valve assembly disposed in a valve assembly cavity of the gun body and configured to allow or block the liquid to pass through the liquid passage; a driving mechanism disposed in a driving mechanism cavity of the gun body and configured to control the opening or closing of the valve assembly; and a barrel assembly at least partially disposed in a barrel assembly cavity of the gun body and configured to accommodate the liquid passage; wherein the barrel assembly includes a Venturi valve disposed in the barrel assembly cavity. The fuel gun of the present invention has a reasonable structure, which is conducive to forming smooth liquid and gas passages and is also more convenient for maintenance.

Description

Technical Field

[0001] The present invention relates to the field of refueling equipment, and particularly to a fuel gun. Background Art

[0002] With the development of technology and the improvement of living standards, more and more cars have entered 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, a gas station includes: a fuel storage tank arranged underground and a plurality of refueling devices connected to the fuel storage tank. Each refueling device fills the vehicle with fuel through a fuel gun thereon.

[0003] For a long time, the oil vapor generated during the refueling process would be emitted into the air inside or near the gas station. However, fuels such as gasoline or diesel in the gas station are mostly volatile and have certain toxicity, and their ignition points are very low and are easily ignited, posing potential safety hazards. With the increasing environmental protection requirements, the requirements for environmental protection and safety of gas stations are also getting higher and higher. In order to minimize the oil vapor inside and around the gas station, the oil and gas recovery technology has been popularized, and fuel guns with oil and gas recovery functions have been widely used. However, the existing fuel guns with oil and gas recovery functions have a short development time, their structures are not reasonable enough, and the technology is not yet mature. Therefore, the design of a new oil and gas recovery fuel gun has become an urgent need. Summary of the Invention

[0004] In view of the technical problems existing in the prior art, the present invention provides a fuel gun, including: a gun body including a liquid passage for supplying oil; a valve assembly arranged in a valve assembly cavity of the gun body and configured to allow or block the passage of oil through the liquid 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 barrel assembly at least partially arranged in a barrel assembly cavity of the gun body and configured to accommodate the liquid passage; wherein, the barrel assembly includes a Venturi valve arranged in the barrel assembly cavity.

[0005] For the fuel gun as described above, the valve assembly cavity and the driving mechanism cavity are on the same axis, and the barrel assembly cavity is not on the same axis as the valve assembly cavity and the driving mechanism cavity.

[0006] For the fuel gun as described above, the barrel assembly includes a barrel, one end of which is connected to the Venturi valve and the other end is arranged outside the gun body.

[0007] For the fuel gun as described above, the included angle between the Venturi valve and the driving mechanism is an obtuse angle.

[0008] For the fuel gun as described above, it further includes: a vacuum passage connecting the Venturi valve to the outside of the fuel gun and configured to supply gas to the Venturi valve; wherein, the vacuum passage includes a first part extending along the barrel and a second part located inside the gun body.

[0009] The fuel dispenser nozzle as described above, wherein the first part of the vacuum channel is integral with the barrel.

[0010] The fuel dispenser nozzle as described above, wherein the gun body further includes a gas channel configured to recycle the collected oil vapor back to the fuel dispenser; wherein the barrel assembly further includes an air pipe at least partially extending along the barrel, and the air pipe communicates with the gas channel in the gun body.

[0011] The fuel dispenser nozzle as described above further includes a connecting member that fixedly connects the air pipe to the barrel or the Venturi valve.

[0012] The fuel dispenser nozzle as described above, wherein the connecting member is further configured to connect the first part of the vacuum channel extending along the barrel and the second part of the vacuum channel in the gun body while fixing the air pipe to the barrel, but keeping the vacuum channel unconnected to the gas channel.

[0013] The fuel dispenser nozzle as described above further includes an attitude device disposed in the second part of the vacuum channel and configured to control the on-off of the vacuum channel according to different angles of the fuel dispenser nozzle.

[0014] The fuel dispenser nozzle as described above, wherein the attitude device includes a moving member that can move freely along the second part of the vacuum channel; when the inlet and outlet of the second part of the vacuum channel are on one side of the moving member, the vacuum channel is connected; when the inlet and outlet of the second part of the vacuum channel are on both sides of the moving member, the vacuum channel is blocked by the moving member.

[0015] The fuel dispenser nozzle as described above further includes: a vacuum cap disposed in the vacuum cap cavity of the gun body and configured to lock the drive mechanism to make the drive mechanism in an available state; wherein, there is a pressure channel between the vacuum cap cavity and the Venturi valve.

[0016] The fuel dispenser nozzle of the present invention has a reasonable structure, which is conducive to forming unobstructed oil and gas channels and is also more convenient for maintenance. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Next, the preferred embodiments of the present invention will be further described in detail with reference to the drawings, wherein:

[0018] Figures 1A - 1F is a schematic structural diagram of a fuel dispenser nozzle according to an embodiment of the present application;

[0019] Figure 2 is an exploded view of the structure of a fuel dispenser nozzle according to an embodiment of the present application;

[0020] Figures 3A - 3D is a schematic diagram of a valve assembly according to an embodiment of the present application;

[0021] Figure 4Exploded view of a valve assembly according to an embodiment of the present application;

[0022] Figures 5A - 5D Schematic diagram of a drive mechanism according to an embodiment of the present application;

[0023] Figure 6 Exploded view of a drive mechanism according to an embodiment of the present application;

[0024] Figures 7A - 7D Schematic diagram of a vacuum cap according to an embodiment of the present application;

[0025] Figure 8 Exploded view of a vacuum cap according to an embodiment of the present application;

[0026] Figures 9A - 9D Schematic diagram of a barrel assembly according to an embodiment of the present application; and

[0027] Figure 10 Exploded view of a barrel assembly according to an embodiment of the present application. Detailed Description of the Invention

[0028] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Apparently, the described embodiments are some, but not all, of the embodiments of the present invention. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0029] In the following detailed description, reference may be made to the accompanying drawings which form a part hereof, and in which are shown by way of illustration specific embodiments in which the application may be practiced. In the drawings, like reference numerals describe substantially similar components in different figures. The various specific embodiments of the present application are described in sufficient detail below to enable those of ordinary skill in the art with relevant knowledge and technology to implement the technical solutions of the present application. It should be understood that other embodiments may be utilized or structural, logical, or electrical changes may be made to the embodiments of the present application.

[0030] The fuel nozzle (which can also be referred to as the "oil nozzle") is connected to the fuel dispenser through a hose. The oil enters the fuel nozzle through the hose, passes through the oil circuit valve and the Venturi valve in the fuel nozzle, and after flowing out of the barrel, is added to the fuel tank of the vehicle. The opening and closing of the oil circuit valve can be controlled through the trigger on the fuel nozzle via the driving mechanism. The vacuum cap can lock the driving mechanism. In the vapor recovery function, the vapor of the oil passes through the gas passage and is recovered into the fuel dispenser through the gas circuit valve. In the current design of the fuel nozzle, all the oil circuit valve, the Venturi valve, and the gas circuit valve are centrally arranged together, resulting in frequent changes in the flow path of the oil, a complex oil flow environment, consumption of the energy of the oil, and problems such as slow flow rate of the fuel nozzle; moreover, the centralized arrangement of multiple valves will also cause problems such as assembly and maintenance.

[0031] This application proposes a fuel nozzle with a completely new design. In the new design, the positions of multiple valves in the fuel nozzle are optimized, merged into one whole as much as possible or separated from each other, and the flow path through which the oil passes is further optimized, so that the fuel nozzle of this application has a high flow rate while the structure is more reasonable, and the assembly and maintenance of the fuel nozzle are more convenient.

[0032] The technical solution of this application will be further described below through specific embodiments. Those skilled in the art should understand that the following description is only for the convenience of understanding the technical solution of this application and should not be used to limit the protection scope of this application.

[0033] Figures 1A - 1F It is a schematic structural diagram of a fuel nozzle according to an embodiment of this application. Figure 1A and Figure 1B are three-dimensional views of the fuel nozzle in different directions, showing its overall shape; Figure 1C is Figure 1A a cross-sectional view along line A-A in Figures 1D - 1F and Figure 1C are cross-sectional views along lines B-B, C-C, and D-D in Figure 2 is an exploded view of the structure of a fuel nozzle according to an embodiment of this application.

[0034] As shown in the figure, the fuel nozzle 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 the hose through the inlet thread, and then the fuel nozzle can be connected to the fuel dispenser. The oil from the fuel dispenser enters the gun body through the oil inlet and then flows out of the gun body through the oil outlet. According to an embodiment of this application, the gun body 110 can be injection molded. According to an embodiment of this application, the material of the gun body 110 is a metal or alloy such as aluminum or stainless steel.

[0035] As shown in the figure, the fuel gun 100 further includes a valve assembly 120, a drive mechanism 130, a vacuum cap 140, and a barrel assembly 150 disposed between the inlet and the outlet of the gun body 110. The valve assembly 120 is configured to allow or block the passage of the oil fluid through the gun body 110, and to allow or block the passage of the recovered oil fluid vapor through the gun body 110. The drive mechanism 130 is connected to the valve assembly 120 to control the opening and closing of the valve assembly 120, and thus can control the passage of the oil fluid and / or the oil fluid vapor. The vacuum cap 140 is used to lock the drive mechanism 130. When the drive mechanism 130 is in the locked state, the drive mechanism 130 becomes an integral whole and is in an available state. When the drive mechanism 130 is in the 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 disposed at the front of the gun body 110 and can be inserted into the fuel tank of the vehicle to add the oil fluid into it.

[0036] In some embodiments, the gun body 110 further includes a plurality of chambers for accommodating the various components of the fuel 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 a part of the barrel assembly 150.

[0037] In some embodiments, the valve assembly chamber and the drive mechanism chamber are arranged substantially in parallel and have substantially the same axis to ensure that the liquid channels are substantially in the same direction. Further, the barrel assembly chamber does not have substantially the same axis as the valve assembly chamber and the drive mechanism chamber, but forms a certain angle. In this way, the fuel gun will not become too long to affect the use. In some embodiments, the Venturi valve is located in the barrel assembly chamber. The Venturi valve is closer to the barrel assembly than the drive mechanism. The Venturi valve and the drive mechanism do not have substantially the same axis.

[0038] In some embodiments, the gun body 110 may further include a liquid channel 104 and a gas channel 105 between the valve assembly chamber and the barrel assembly chamber; wherein, the oil channel 104 defines a passage for the oil fluid to enter the fuel tank of the vehicle through the gun body 110; the gas channel 105 defines a passage for the oil fluid vapor to be recovered into the fuel dispenser through the gun body 110. In some embodiments, the part of the liquid channel 104 in the drive mechanism chamber protrudes outward from the gun body to facilitate compensating for the oil fluid channel occupied by the drive mechanism chamber, so that the flow area of the oil fluid in the valve assembly is the same, avoiding the formation of a bottleneck in the flow area and losing the energy of the oil fluid.

[0039] In some embodiments, the gun body 110 may further include an oil pressure passage 106 between the valve assembly chamber and the vacuum cap chamber and an air pressure passage 107 between the vacuum cap chamber and the barrel assembly chamber. The oil enters the vacuum cap 140 through the oil pressure passage 106, and the oil pressure provided by the oil can push the vacuum cap 140 to lock the drive mechanism 130, bringing it into an available state. One end of the air pressure passage 107 is connected to the vacuum cap chamber, and the other end is connected to the Venturi valve. When the Venturi valve extracts the air in the vacuum cap 140 through the air pressure passage 107, the vacuum cap can be disengaged from the drive mechanism 130, bringing it into a non-available state.

[0040] In some embodiments, the fuel dispenser 100 further includes a trigger 160 located outside the gun body 110, which is connected to the drive mechanism 130 through a conversion member 161 and can be used to control the drive mechanism. In some embodiments, the conversion member 161 is also located outside the gun body, and one end thereof is connected to the trigger 160. One side or both sides of the gun body 110 include openings 103, and the other end of the conversion member 161 is connected to the drive mechanism 130 through the openings 103. In the locked state, when the trigger 160 is pulled, the drive mechanism 130 can be pushed via the conversion member 161, thereby controlling the valve assembly 120.

[0041] In some embodiments, the fuel dispenser may further include a guard bow 164, which is disposed outside the trigger 160 and is detachably connected to the gun body 110 for protecting the hand during refueling. In some embodiments, the guard bow 164 includes one or more pins 165 for clamping the trigger 160 to facilitate fixing the trigger 160 when the operator refuels. Correspondingly, the trigger 160 also includes a clamping structure, which is disposed at the tail of the trigger 160 and can be pushed to insert into each pin of the guard bow 164, thereby providing different oil flow rates.

[0042] In some embodiments, the fuel dispenser 100 may further include an antifriction strip 166, which is disposed on the gun body and is located between the gun body and the conversion member. The antifriction strip 166 can be made of materials such as felt, rubber, and plastic, which is beneficial to reducing the friction between the conversion member 161 and the gun body 110 when the trigger 160 is pulled, making it easier and smoother for the operator to pull the trigger.

[0043] The technical solution of the present invention will be further described below through specific examples of each component. Those skilled in the art should understand that the description of these components is not used to limit the solution of the present invention. Other components with similar functions can also be applied herein and become part of the technical solution of the present invention.

[0044] Figures 3A - 3D Schematic diagram of a valve assembly according to an embodiment of the present application. Figure 3A and Figure 3B Isometric views of the valve assembly in different directions, showing its overall shape; Figure 3CIt is a side view of the valve assembly, showing its side shape; Figure 3D It is Figure 3C a schematic cross-sectional view of, showing its cross-sectional shape. Figure 4 It is an exploded view of the valve assembly according to an embodiment of the present application.

[0045] Referring to Figures 1D - 1F 、 Figures 3A - 3D and Figure 4 , the valve assembly 120 is generally cylindrical in shape and includes an oil circuit valve 310 and a gas circuit valve 320; wherein, the oil circuit valve 310 is disposed on the liquid passage 104 in the gun body 110 for controlling the flow of oil through the gun body 110; the gas circuit valve 320 is disposed on the gas passage 105 of the gun body 110 for controlling the recovery of oil vapor.

[0046] Of course, as understood by those skilled in the art, the valve assembly 120 may also have other shapes. For example: conical, or yurt-shaped, etc., or one or both of the oil circuit valve 310 and the gas circuit valve 320 are conical or yurt-shaped.

[0047] According to an embodiment of the present application, the oil circuit valve 310 may be connected to the gas circuit valve 320 integrally. In some embodiments, the two may also be integrally formed to form a valve assembly 120 that can control both the liquid passage and the gas passage. Thus, the opening and closing of the oil circuit valve 310 and the gas circuit valve 320 can be controlled simultaneously. Therefore, although the structures of the oil circuit valve 310 and the gas circuit valve 320 are described separately below, this does not mean that they are separate structures.

[0048] In some embodiments, the direction of the gas passage deflects in the valve assembly 120, while the direction of the liquid passage remains substantially unchanged. In some embodiments, further, in the valve assembly 120, the gas passage is located inside the liquid passage, which has a lower impact on the flow rate of the oil, making it easier for the liquid passage to occupy a larger cross-sectional area and facilitating an increase in the flow rate of the oil.

[0049] In some embodiments, the oil circuit valve 310 includes a valve seat 311 and a valve core 312; wherein, the valve core 312 is generally flat, and one end thereof is coupled to the driving mechanism 130. When the valve core 312 abuts against the valve seat 311, the flow of oil is prohibited from passing through the oil gun. When the driving mechanism 130 pushes the valve core 312 away from the valve seat 311, the flow of oil is allowed to pass. According to an embodiment of the present application, the oil circuit valve further includes a return spring 313 for resetting the valve core, i.e., pushing the valve core 311 to abut against the valve seat 312.

[0050] In some embodiments, the diameter of the liquid channel between the gun body 110 from the oil inlet to the oil path valve is approximately equivalent to the diameter of the oil inlet thread. For example, when the inlet thread can be M34×1.5, the diameter of the liquid channel of the oil path valve seat when the valve core has not passed through can reach Ф32mm, thus being able to support a relatively high flow rate. In some embodiments, the radius of the oil path valve core is substantially the same as the radius of the liquid channel before the valve core has passed through, or the difference between the two is less than 5mm, thus ensuring the continuity of the liquid channel. In some embodiments, a large area around the valve seat 311 is hollowed out, with only a small amount of support remaining, to increase the area of the oil path channel in the oil path valve 310 and increase the flow rate of the oil gun.

[0051] In some embodiments, the outer side of the valve seat 311 near the valve core 312 includes a groove 314, and its position corresponds to the position of the oil pressure channel 106 on the gun body. After the oil enters the oil path valve, before the valve core is opened, the oil can enter the groove 314 from the liquid channel inside the oil path valve 310 through the gap or reserved passage (not shown in the figure) between the oil path valve 310 and the gun body 110, and then will enter the oil pressure channel 106 and reach the vacuum cap cavity in the gun body 110. In some embodiments, the gap or passage is designed such that the flow rate of the oil entering the vacuum cap cavity or returning from the vacuum cap cavity to the valve assembly cavity is a predetermined flow rate, so as to prevent the oil pressure in the vacuum cap cavity from changing too quickly.

[0052] In some embodiments, the valve seat 310 further includes a sealing ring 315 and a limiting groove 316. Among them, the limiting groove 316 is used to accommodate the sealing ring 315. The limiting groove can define the position of the sealing ring 315, preventing the position of the sealing ring from changing during the installation process and affecting the sealing effect of the oil gun. The limiting groove 316 is arranged outside the groove 314 (the side away from the valve core 312), which can prevent oil leakage.

[0053] In some embodiments, the end of the oil path valve 310 away from the oil inlet further includes a flow guiding cone 317. For example, the shape of the flow guiding cone 317 can be similar to that of a yurt, presenting a conical shape that gradually decreases along the direction of oil flow; rather than presenting a conical shape that gradually increases. The reason for such a configuration is that the flow guiding cone 317 can guide the oil passing through the valve core 312, preventing the oil from forming vortices after passing through the valve core and losing the energy of the oil. As understood by those skilled in the art, the flow guiding cone 317 can also have other shapes. For example: multi-layer stepped shape, etc. In one embodiment, the flow guiding cone 317 can include a protrusion 318, which is used to contact the driving mechanism 130, facilitating increasing the distance between the flow guiding cone and the driving mechanism and preventing collision during assembly. In a further embodiment, the protrusion 318 includes one or more platforms 319, which are arranged on the side surface of the protrusion 318 and can be used to define the position of the flow guiding cone and also facilitate the assembly and positioning between parts. In some embodiments, the protrusion 318 and the flow guiding cone 317 are integrally formed.

[0054] In some embodiments, the gas path valve 320 includes a valve seat 321 and a valve stem 322; wherein, the valve seat 321 is annular, and it includes an outer ring 323 and an inner ring 324. The outer ring 323 is for the passage of oil, and the inner ring 324 is for the passage of oil vapor. A part of the valve stem 322 is disposed in the valve seat 321 after diameter reduction, and is used to control the passage of oil vapor. One end of the valve stem 322 extends to be connected with the valve core 312, which is beneficial for the driving mechanism 130 to synchronously open the oil path valve and the gas path valve. The valve stem 322 and the valve core 312 can be fixedly connected, for example: threaded connection. The valve stem 322 and the valve core 312 can also be movably connected, for example, directly abutted. In some embodiments, the outer ring diameter of the valve seat 321 is the same as the diameter of the oil inlet of the gun body or the difference between the two is less than 3 mm. In some embodiments, the cross-sectional area of the outer ring diameter of the valve seat 321 is substantially the same as the cross-sectional area of the liquid passage before the oil flow valve passes through the valve core.

[0055] In some embodiments, the gas path valve 320 further includes a sealing seat 327, which is disposed between the valve stem 322 and the valve seat 321. As shown in the figure, the sealing seat 327 can be fixed on the valve seat 321 through a plurality of limiting grooves 328 thereon. The sealing seat 327 is used to isolate the liquid passage and the gas passage of the gas path valve, prevent the mixing of oil and oil vapor, and can also prevent direct friction between the valve stem 322 and the valve seat 321, increase the service life of the oil gun, and facilitate maintenance and replacement. In some embodiments, the connecting part of the valve stem 322 and the valve core 312 can also be located in the sealing seat 327. Further, one or more sealing rings are included between the sealing seat 327 and the valve stem 322, which can achieve the sealing between the oil path channel and the gas path channel. The sealing seat includes one or more limiting grooves, which are used to accommodate the sealing rings.

[0056] In one embodiment, the diameter of the valve stem 322 is reduced to form an inclined surface, which abuts against the corresponding inclined surface in the sealing seat 327, forming a valve structure with a larger contact surface of the gas path valve 320. Of course, the valve stem 322 can also contact the sealing seat 327 through a valve head with a larger diameter. When the valve stem 322 contacts the sealing seat 327, the passage of oil vapor through the gas path channel will be prohibited. When the valve stem 322 slides out of the sealing seat 327, the passage of oil vapor through the gas path channel will be allowed. In some embodiments, the valve stem 322 includes a limiting groove at a corresponding position in the sealing seat, which can be used to accommodate the sealing ring and can be used to limit the position of the sealing ring.

[0057] In some embodiments, the valve seat 321 includes one or more holes 325 that pass through the outer ring 323 of the valve seat 321 but do not communicate with the outer ring 323. Instead, they communicate the outside of the valve seat 321 with the inner ring 324 of the valve seat, and can be used to accommodate the passage of oil vapor. Thus, the direction of the gas passage in the inner ring 323 deflects, for example, a vertical deflection. Since the fluidity of the gas is better and the resistance is smaller, such a setting can leave more passages for the liquid passage, thereby reducing the oil resistance and increasing the flow rate.

[0058] In some embodiments, the valve seat 321 may include grooves 326 near the plurality of holes 325, which can connect the plurality of holes 325 to form a whole. In some embodiments, the valve seat 321 further includes a plurality of sealing rings, which are arranged on both sides of the holes 325 or the grooves 326 to seal the passage of the oil vapor and prevent leakage. Further, the valve seat 321 further includes a plurality of limiting grooves, which are used to accommodate the sealing rings and can be used to limit the positions of the sealing rings to prevent the positions of the sealing rings from changing during the assembly process and affecting the sealing effect of the oil gun.

[0059] In one embodiment, the air path valve 320 further includes a return spring 329, which is sleeved on the valve stem 322. In some embodiments, the return spring 329 is located in the return spring 313, with one end disposed on the valve stem 322, for example, on a part of the connection with the valve core 312, and the other end disposed on the sealing seat 327. The return spring 329 resets the air path valve 320 by pushing the valve stem 322, that is, pushing the end of the valve stem into the sealing seat. Of course, as understood by those skilled in the art, when the valve stem is fixedly connected to the valve core, the return spring 329 may not be included.

[0060] In some embodiments, one end of the return spring 313 is disposed on the valve core, and the other end is disposed on the inner ring wall of the air path valve seat. The positions of the inner ring wall and the sealing seat remain unchanged. When the trigger 160 of the oil gun is pulled to drive the drive mechanism 130 to open the oil path valve 310 and the air path valve 320, both the return springs 313 and 329 are compressed. When the thrust of the drive mechanism 130 is removed, the return springs 313 and 329 return to their original states and can reset the valve core and the valve stem respectively. Therefore, to open the oil path valve and the air path valve, it is necessary to overcome the forces of the return springs 313 and 329 and the pressure of the oil. When closing the oil path valve and the air path valve, the forces of the return springs 313 and 329 simultaneously press the oil path valve and the air path valve. Such a configuration is not only compact in structure and convenient for assembly, but also has a good sealing effect for the oil path valve and the air path valve, and can greatly extend the service life of the oil gun.

[0061] In some embodiments, the valve assembly 120 may further include a positioning ring 330, which is disposed on a side of the gas path valve away from the oil path valve to define the positions of the oil path valve and the gas path valve. During installation, by screwing the positioning ring 330, the oil path valve 310 and the gas path valve 320 can be pushed and installed into the valve assembly cavity of the gun body 110. The positioning ring can further fix the positions of the oil path valve 310 and the gas path valve 320 to prevent them from moving towards the oil inlet of the gun body 110. In one embodiment, the positioning ring 330 may include threads that can engage with the threads of the gun body 110, thus facilitating the installation and positioning of the valve assembly 120.

[0062] During the refueling process, the oil fluid enters the oil path valve 310 from the outer ring of the gas path valve 320 and then enters the fuel tank of the vehicle. Due to problems such as corrosion of the internal pipelines of the fuel dispenser, the oil fluid coming out of the fuel dispenser may very likely be doped with some impurities. In some embodiments, the valve assembly further includes a filter screen 340, which is disposed between the positioning ring 330 and the gas path valve 320 to filter the oil fluid coming out of the fuel dispenser and prevent impurities from entering the components of the fueling gun. For example, the filter screen 340 is circular, and its shape matches the cross-sectional shape of the gas path valve seat, which can effectively filter the impurities in the oil fluid. Of course, as understood by those skilled in the art, the filter screen can also have other shapes.

[0063] In these embodiments of the present invention, the valve assembly 120 is generally cylindrical, and the cross-sectional area of the oil fluid channel in the valve assembly remains unchanged or changes little, thus not causing energy loss of the oil fluid and increasing the flow rate of the fueling gun; moreover, the valve seat of the oil path valve is as hollowed out as possible, further increasing the cross-sectional area of the oil fluid channel and improving the flow rate of the fueling gun. Further, the gas path valve and the oil path valve can be connected into a whole. The driving mechanism 130 pushes the valve core 312 of the oil path valve 310 to simultaneously open the gas path valve 320, so that the two can act in unison, ensuring that the oil fluid vapor can be recovered while opening the oil fluid passage.

[0064] Figures 5A - 5D Schematic diagram of a driving mechanism according to an embodiment of the present application. Figure 5A and Figure 5B are perspective views of the driving mechanism in different directions, showing its overall shape; Figure 5C is a side view of the driving mechanism, showing its side shape; Figure 5D is a cross-sectional view of the driving mechanism, showing its cross-sectional shape. Figure 6 Exploded view of a driving mechanism according to an embodiment of the present application.

[0065] Reference Figures 1D - 1F 、 Figures 5A - 5D and Figure 6, the drive mechanism 130 includes a fixed bushing 510, a drive bushing 520, and a drive shaft 530; wherein, the drive shaft 530 is adapted to be assembled in the drive bushing 520; one end of the drive bushing 520 in contact with the drive shaft 530 is adapted to be assembled into the fixed bushing 510; correspondingly, the other end of the drive shaft 530 is also adapted to be assembled into the fixed bushing 510, forming a stacked assembly structure. In some embodiments, the fixed bushing 510 is fixed in the drive mechanism cavity of the gun body 110, and the drive bushing 520 and the drive shaft 530 can respectively reciprocate along the axis direction of the fixed bushing.

[0066] According to an embodiment of the present invention, the fixed bushing 510 is generally cylindrical as a whole, with a hollow interior. The first end includes an opening 511, which is used to accommodate the drive bushing 520 to pass through and extend into the interior of the fixed bushing 510. In some embodiments, the second end of the fixed bushing 510 is conical, which is convenient for the fixed bushing to be assembled into the drive mechanism cavity of the gun body 110, and does not affect the air pressure passage of the gun body 110, making the air pressure passage straight and avoiding the formation of a complex air pressure passage, increasing the casting difficulty of the gun body 110.

[0067] In some embodiments, the fixed bushing 510 further includes openings 512 and 513, which are oppositely arranged on both sides of the fixed bushing 510 and extend from the second end of the fixed bushing 510 towards the middle of the fixed bushing 510, corresponding to the opening 103 on the gun body 110. As understood by those skilled in the art, taking Figure 5C the setting direction of the drive mechanism as the reference direction. The conversion member 161 can be coupled to the drive shaft 530 through the openings 512 and 513. Specifically: the conversion member 161 can include a connecting member 162 and a driving member 163. Among them, the connecting member 162 can be a U-shaped connecting member, with one end of the opening disposed on the gun body, and one end of the U-shaped bottom connected to the trigger 160. The driving member 163 can be a pin, rod, stick, nail, etc., which can be inserted into the openings 512 and 513 on the fixed bushing 510 from the opening 103 on the gun body, and then pass through the gun body 110 and be connected to the connecting member 162. When the trigger 160 is pulled, the connecting member 162 rotates in a circular motion relative to the fixed point of the gun body 110, and the driving member 163 moves linearly along the opening 103, opening 512, and opening 513, and then can push the drive bushing 520 to move on the axis of the fixed bushing 510.

[0068] In some embodiments, the fixed bushing 510 further includes a recess 514 for defining the position of the fixed bushing. Referring to Figure 1D , the relative position between the fixed bushing and the gun body can be defined or fixed through the limiting member 501. For example, the limiting member 501 can be a limiting pin, limiting nail, limiting rod, limiting block, screw, etc.

[0069] In some embodiments, the fixed bushing 510 may further include a strip-shaped opening 515, which is provided at the bottom of the fixed bushing 510 for accommodating the limit rod 502 to pass through. Refer to Figure 5D , the fixed bushing 510, the drive bushing 520, and the drive shaft 530 can be limited by the limit rod 502 to prevent axial rotation between the three and change their relative positions. When the drive shaft 530 or the drive bushing 520 moves in the fixed bushing, the limit rod 502 also moves accordingly in the strip-shaped opening 515. The limit rod 502 or a part thereof may include a thread, which can be threadedly connected to the drive shaft. In some embodiments, the fixed connection between the limit rod 502 and the drive shaft 530 can also be in other ways. For example: snap connection, adhesion, interference fit, or transitional fit, etc.

[0070] In some embodiments, the fixed bushing 510 may further include an opening 516, which is provided above the fixed bushing 510 and is located between the recess 514 and the first end of the fixed bushing 510 for accommodating the shift pin seat of the vacuum cap.

[0071] In some embodiments, the fixed bushing 510 may further include a first sealing ring 517 and a second sealing ring 518; wherein, the first sealing ring 517 and the second sealing ring 518 are located at the first end of the fixed bushing 510. The first sealing ring 517 is used to seal the fixed bushing 510 and the gun body 110 to prevent oil from entering the drive mechanism cavity of the gun body 110 and then leaking out of the oil gun through the opening 103; the second sealing ring 518 is used to seal the fixed bushing 510 and the drive bushing 520 to prevent oil from entering the interior of the fixed bushing and then leaking out of the oil gun through the opening on the fixed bushing. According to an embodiment of the present application, the fixed bushing 510 may further include a limit groove 519, which is used to accommodate the first sealing ring 517 and / or the second sealing ring 518 to limit the position of the sealing ring and prevent the position of the sealing ring from changing during the assembly process, affecting the sealing effect of the oil gun.

[0072] According to an embodiment of the present invention, the overall shape of the drive bushing 520 is generally cylindrical, and its interior is hollow for accommodating the drive shaft 530 to pass through and extend into the interior of the drive bushing. According to an embodiment of the present application, the drive bushing 520 may include a groove 521, which is located at the first end of the drive bushing. The groove 521 corresponds to the positions of the openings 512 and 513 of the fixed bushing 510 for accommodating the drive member 163 of the conversion member 161. In some embodiments, the drive bushing 520 may not include the groove 521, and the first end of the drive bushing 520 does not extend beyond the opening 512 or the opening 513 of the fixed bushing 510.

[0073] According to an embodiment of the present application, the second end of the drive shaft sleeve 520 includes a protrusion 522 that contacts the flow guiding cone 317 (for example, contacts the protrusion 318 of the flow guiding cone 317), which is used to push the flow guiding cone 317 or the valve core 312, facilitating an increase in the distance between the drive mechanism and the flow guiding cone and facilitating the drive mechanism to push the flow guiding cone. In some embodiments, the protrusion 522 may further include one or more platforms 523, which are used to define the position of the drive shaft sleeve to prevent it from rotating and facilitate determining the assembly position between the parts of the oil gun. According to an embodiment of the present application, the protrusion 522 is integrally formed with the drive shaft sleeve 520.

[0074] In some embodiments, the drive shaft sleeve 520 may further include an opening 524, which is disposed above the drive shaft sleeve 520 and near the middle of the drive shaft sleeve 520, and is used to accommodate the shift pin of the vacuum cap shift pin seat. Correspondingly, the corresponding position of the drive shaft also includes an opening 531, and the size of the opening is the same as that of the opening 524. When the shift pin of the vacuum cap shift pin seat falls into the openings 524 and 531, the drive shaft and the drive shaft sleeve become an integral body (i.e., the oil gun achieves "shifting gears"). At this time, the drive mechanism is in an available state. When the driving member 163 pushes the drive shaft 530 to move, the drive shaft sleeve 520 moves along with the drive shaft 530. When the shift pin of the vacuum cap shift pin seat leaves the opening 524 and / or the opening 531, the drive shaft is separated from the drive shaft sleeve. At this time, the drive mechanism is in a non-available state. When the driving member 163 pushes the drive shaft 530 to move, the drive shaft 530 moves relative to the drive shaft sleeve 520 and cannot push the drive shaft sleeve 520 to act.

[0075] According to an embodiment of the present invention, the drive shaft 530 is generally cylindrical. The end near the contact with the drive shaft sleeve 520 includes a dry test hole 532, whose position corresponds to the groove 521 of the drive shaft sleeve 520, and is used to lock the drive shaft 530 and the drive shaft sleeve 520 to form an integral body from the outside of the gun body for dry testing without oil (i.e., simulating refueling testing) before using the oil gun. Specifically, a positioning member (such as a pin, nail, rod, pole, etc.) is inserted into the opening 512 of the fixed shaft sleeve from the opening 103 of the gun body 110, passes through the groove 521 of the drive shaft sleeve 520, then passes through the dry test hole 532, and then passes through the opening 513 of the fixed shaft sleeve 510 and exits the gun body. At this time, the driving member 163 pushes the drive shaft 530 to move along the axis direction of the fixed shaft sleeve 510. The drive shaft 530 drives the positioning member to move synchronously, and the positioning member pushes the groove 521 of the drive shaft sleeve 520, thereby pushing the drive shaft sleeve 520 to move. Thus, without the shift pin of the vacuum cap shift pin seat falling into the openings 531 and 524 of the drive shaft and the drive shaft sleeve, the drive shaft 530 and the drive shaft sleeve 520 can be locked, making the drive mechanism in an available state, opening the valve assembly, and realizing the dry test of the oil gun.

[0076] In some embodiments, the driving mechanism 130 may further include a spring 540 between the driving shaft 530 and the driving shaft sleeve 520, which can be used to reset the driving shaft and buffer the movement between the driving shaft sleeve and the driving shaft. For example, when the shifting pin of the shifting part of the vacuum cap does not enter the openings 524 and 531, pulling the trigger conversion part 161 will push the driving shaft to act, but the driving shaft sleeve will not move with the driving shaft, and the driving shaft can only compress the spring 540. The valve assembly 120 will not open. After releasing the trigger, the spring 540 will cause the driving shaft to return to its original position.

[0077] The driving mechanism of the present application is a split driving mechanism, which needs to be locked by a special "shifting" locking mechanism to form an integral structure. Only by pulling the trigger can the driving mechanism push the valve assembly. The split driving mechanism defines the relative circumferential positions of each part through the same limiting rod, making the positions of the components of the driving mechanism accurate and facilitating assembly.

[0078] Figures 7A - 7D Schematic diagram of a vacuum cap according to an embodiment of the present application. Figure 7A and Figure 7B are perspective views of the vacuum cap in different directions, showing its overall shape; Figure 7C is a side view of the vacuum cap, showing its side shape; Figure 7D is a cross-sectional view of the vacuum cap, showing its cross-sectional shape. Figure 8 Exploded view of a vacuum cap according to an embodiment of the present application. The vacuum cap is mainly used to "shift gears" (i.e., lock the driving mechanism) for the driving mechanism in advance during refueling, so that the driving mechanism forms an integral body and is in an available state. When refueling is completed, the "shifting gears" of the driving mechanism is cancelled (i.e., the driving mechanism is in an unlocked state).

[0079] Referring to Figures 1D - 1F 、 Figures 7A - 7D and Figure 8 , the vacuum cap 140 includes a cap 710 and a base 720. Among them, the cap 710 is integrally in a hollow cylindrical shape, and it is arranged on the base 720 to form the internal space of the vacuum cap. The base 720 is fixed in the vacuum cap cavity and provides a basis for other parts of the vacuum cap 140.

[0080] In some embodiments, the outer side or a part of the outer side of the cap 710 includes threads 714, which can connect the cap 710 to the vacuum cap cavity of the gun body 110. Correspondingly, there are threads in the vacuum cap cavity of the gun body that can engage with it. The cap 710 also presses the base 720 below it, thereby achieving fixation between the two and the vacuum cap cavity. Of course, as understood by those skilled in the art, connecting through threaded keys is just one implementation in this field, and other existing implementations in this field can be applied to the technical solution of this application. For example: adhesion, welding, interference fit, etc. In one embodiment, the top and / or bottom of the cap 710 further includes a hollow 715, which helps to reduce the weight of the cap and the cost of the oil gun.

[0081] In some embodiments, the base 720 includes one or more limiting blocks 721, which are arranged at intervals on the circumference of the base 720 and close to the side of the cap 710, for defining the position of the cap 710, so that there is a certain distance between the two. The position of the distance between the two defines the air pressure channel 107 of the gun body 110. In some cases, the air pressure channel 107 can suck the air between the cap 710 and the base 720. In some other embodiments, the limiting blocks 721 can also be arranged at other positions of the base 720.

[0082] In some embodiments, the side surface of the cap 710 may include one or more through holes 711, which communicate the inside and outside of the cap 710 and become a part of the oil pressure channel 106 on the gun body 110, facilitating the oil to enter the internal space of the vacuum cap through the oil pressure channel 106.

[0083] In some embodiments, the cap 710 may further include a plurality of sealing rings 712, which are arranged between the cap 710 and the gun body 110 and on the upper and lower sides of the through holes 711, preventing the oil from leaking out of the oil gun through the oil pressure channel 106 into the vacuum cap cavity or further flowing into the drive mechanism cavity and leaking out of the oil gun. Taking Figure 7C the setting direction of the vacuum cap as the reference direction. In some embodiments, the cap 710 may further include a plurality of limiting grooves 713, which are used to accommodate the sealing rings 712 and limit the sealing rings to prevent the sealing rings from moving during the installation process and affecting the sealing effect of the oil gun.

[0084] In some embodiments, the vacuum cap 140 may further include a piston 730 disposed within the cap 710 and moving up and down inside the cap 710. The hydraulic fluid can enter between the cap 710 and the piston 730 from the hydraulic pressure passage 106 through the through-hole 711 in the cap. When hydraulic pressure exists, the piston 730 will be pushed downward by the hydraulic fluid; when the hydraulic pressure is removed, the piston 730 will move upward with the hydraulic fluid in the cap. The space between the cap 710 and the piston 730 defines the hydraulic fluid part in the vacuum cap. In some embodiments, the piston 730 further includes one or more sealing rings 731 disposed on the circumference of the piston and in contact with the side wall of the cap for sealing between the piston and the cap to prevent the hydraulic fluid from leaking into the area below the piston. The piston may further include a limit groove 732 for defining the position of the sealing ring to prevent the position of the sealing ring from changing when the piston moves.

[0085] According to an embodiment of the present application, above the piston 730 includes one or more depressions 733 in an annular shape. Correspondingly, the part of the cap in contact therewith includes one or more protrusions 716 with a shape similar to that of the depression 733, and the two can cooperate with each other to define a passage for the hydraulic fluid therebetween. The one or more depressions 733 and protrusions 716 can increase the contact area with the hydraulic fluid and buffer the change in hydraulic pressure. When the hydraulic pressure changes drastically, the flow rate of the hydraulic fluid will not change very drastically, so that the movement speed of the piston 730 changes more smoothly.

[0086] In some embodiments, the vacuum cap may further include a self-sealing spring 701 disposed between the piston 730 and the base 720 for restoring the position of the piston 730. Specifically, when the pressure of the hydraulic fluid decreases, the self-sealing spring 701 will push the piston 730 back to its initial position. In some embodiments, the vacuum cap may further include a spring seat 702 disposed between the piston 730 and the self-sealing spring 701.

[0087] In some embodiments, the vacuum cap may further include a diaphragm 740 having a shape and size similar to that of the base, disposed between the base and the step of the vacuum cap cavity of the gun body, and can be used to isolate the air above and below the base. According to an embodiment of the present application, the material of the diaphragm 740 is a flexible or partially flexible material, and its state will change when subjected to a force. For example: it can be rubber, silicone, plastic, etc. The diaphragm 740 and the piston 730 are respectively on both sides of the base 720, defining the gas part in the vacuum cap. The gas passage on the base 720 communicates with this gas part.

[0088] In some embodiments, the vacuum cap may further include a gun-jumping spring 703, which is disposed between the spring seat 702 and the diaphragm 740. According to an embodiment of the present application, the diaphragm 740 includes one or more gaskets 741, which are disposed on both sides of the diaphragm and can be used to clamp the diaphragm 740. Among them, the upper gasket contacts one end of the gun-jumping spring 703 and is used to bear the acting force of the spring, which is beneficial to the force balance of the diaphragm and prevents the spring from damaging the diaphragm.

[0089] In some embodiments, the vacuum cap may further include a gear-shifting pin seat 750, which is disposed below the diaphragm and moves up and down with the diaphragm. A gear-shifting pin 752 is disposed in the gear-shifting pin seat 750, and it can move linearly in the gear-shifting pin seat. In some embodiments, the gear-shifting pin seat further includes tracks 753 and 754. The gear-shifting pin 752 can move along the track 753 and the track 754 to ensure the position accuracy of the movement. As mentioned above, the gear-shifting pin seat 750 coincides with the opening 516 of the fixed bushing 510. When the gear-shifting pin seat 750 falls into the opening 516 of the fixed bushing, the gear-shifting pin can fall into the drive shaft opening 531 and the drive shaft sleeve opening 524, forming a whole with the drive shaft and the drive shaft sleeve.

[0090] In some embodiments, the vacuum cap may further include a connecting member 704, one end of which is connected to the gear-shifting pin seat 750 and the other end is connected to the diaphragm. In some embodiments, the end of the connecting member 704 connected to the diaphragm may further extend through the gun-jumping spring to the spring seat and be connected to the spring seat, which is beneficial to strengthening the connection with the gear-shifting pin seat and guiding its movement.

[0091] The working process of the vacuum cap is generally as follows: For the oil part, when the oil enters the vacuum cap, the oil pressure will push the piston downward, and then push the spring seat, compressing the self-sealing spring and the gun-jumping spring; the gun-jumping spring will continue to push the diaphragm downward, so that the gear-shifting pin of the gear-shifting pin seat can fall into the drive mechanism and lock the drive mechanism; when the oil evacuates from the vacuum cap, without the oil pressure, the self-sealing spring will push the spring seat upward, thus pushing the piston upward and can lift the diaphragm, driving the gear-shifting pin seat to move upward, so that the gear-shifting pin disengages from the drive mechanism and changes the state of the drive mechanism to the unlocked state; For the gas part, when the gas between the piston and the diaphragm is extracted, the diaphragm moves upward, compressing the gun-jumping spring, lifting the diaphragm, driving the gear-shifting pin seat to move upward, so that the gear-shifting pin disengages from the drive mechanism and changes the state of the drive mechanism to the unlocked state.

[0092] Figures 9A - 9D Schematic diagram of a barrel assembly according to an embodiment of the present application. Figure 9A and Figure 9B Are perspective views of the barrel assembly in different directions, showing its overall shape; Figure 9C Is a side view of the barrel assembly, showing its side shape;Figure 9D It is a cross-sectional view of the barrel assembly, showing its cross-sectional shape. Figure 10 It is an exploded view of the barrel assembly according to an embodiment of the present application.

[0093] Reference Figures 1D - 1F 、 Figures 9A - 9D and Figure 10 As shown in FIGS.

[0094] In some embodiments, the air pipe 930 is fixed to the outside of the barrel 920 or the Venturi valve 910. For example, the air pipes 930 are fixed to the valve body of the Venturi valve 910 by threaded connection. In some embodiments, the air pipe can also be fixed to the barrel 920 or the Venturi valve 910 by other connection methods, such as welding, clamping or transitional assembly.

[0095] In some embodiments, the Venturi valve 910 includes a valve seat 911 and a valve core 912. One end of the valve seat is connected to the liquid passage of the gun body 110, and the other end is connected to the barrel. The valve core 912 can act on the valve seat 911 to block the passage of oil. In some embodiments, the part of the valve seat 911 that does not contact the valve core 912 is provided with a hollow to increase the cross-sectional area of the oil passage in the Venturi valve, so that the liquid passage in the oil gun is as consistent as possible, which is beneficial to reducing the energy loss of the oil and increasing the flow rate of the oil gun.

[0096] In some embodiments, the valve seat 911 is a split valve seat, that is, the valve seat includes a plurality of spliced parts. For example: one part is in contact with the valve core, and the other part is not in contact with the valve core. The two are connected into a whole by threaded connection. Such a setting is beneficial to the assembly of the Venturi valve and is convenient for maintenance and replacement of accessories.

[0097] According to an embodiment of the present application, the contact surface between the valve core 912 and the valve seat 911 is an inclined surface. When the oil pressure forces the valve core to leave the valve seat, the oil will produce a "Venturi" effect through the valve core 912, forming a vacuum. In some embodiments, the valve seat 911 includes one or more vacuum holes 913, which connect the contact part between the valve seat 911 and the valve core 912 to the outside of the valve seat, and are used to supplement air to make up for the vacuum formed by the "Venturi" effect of the Venturi valve and maintain the balance of air pressure.

[0098] In some embodiments, there are two channels for replenishing external air into the venturi valve: one is replenished from the vacuum cap cavity via the air pressure channel 107. The vacuum hole 913 corresponds to the position of the air pressure channel 107 on the gun body 110, and it can be connected to the vacuum cap cavity through the air pressure channel 107. The other is replenished via the vacuum channel 108. The vacuum channel 108 extends along the gun barrel 920, one end of which is connected to the vacuum hole 913 on the valve seat 911, and the other end is connected to the outside along the gun barrel 920. In some embodiments, the vacuum channel 108 is arranged on the gun barrel 920 and is integrally formed with the gun barrel 920.

[0099] In some embodiments, reference Figure 1E The oil gun 100 may further include a posture device 170, which is arranged below the barrel assembly and located in the vacuum channel 108 of the gun body 110. The posture device 170 can follow the different elevation angles of the oil gun to make the vacuum channel unblocked or blocked. For example, the posture device 170 includes a steel ball 171 and a plug 172. The steel ball 171 can reciprocate in part of the vacuum channel (for example: on both sides of the connection between the vacuum channel of the gun body and the barrel). The cross-sectional area of the vacuum channel where the steel ball 171 moves is larger than the cross-sectional area of the vacuum channel of other parts on the gun body, preventing the steel ball from moving to other positions. The plug 172 is arranged at the end of the vacuum channel to seal the vacuum channel. When the steel ball 171 moves to the vicinity of the plug 172, the vacuum channel of the gun barrel is above the steel ball 171 and is connected to the vacuum channel on the gun body; when the steel ball moves away from the plug, the vacuum channel of the gun barrel is below the steel ball 171, and the steel ball 171 will block the vacuum channel. The posture device is arranged on the horizontal line of the gun body. When the barrel is raised above the horizontal line, the steel ball will block the vacuum channel, and when the barrel is lowered below the horizontal line, the steel ball will open the vacuum channel.

[0100] In some embodiments, the valve seat 911 and the gun body further include a plurality of sealing rings 914, which are disposed between the valve seat 911 and the gun body 110 and are located on both sides of the hollow portion of the valve seat and on both sides of the vacuum hole to prevent oil from leaking out of the gun body or the vacuum hole from replenishing air from other positions. The valve seat 911 includes a plurality of limiting grooves 915, which are used to accommodate the sealing ring 914, limit the sealing ring, and prevent the position of the sealing ring from moving during the installation process.

[0101] Furthermore, the gun barrel 920 is a bent round tube, which may include a vacuum channel 921. The length of the vacuum channel 921 is the same as the length of the gun barrel and is arranged at the bottom of the gun barrel (with a length of 1 / 4 of the barrel). Figure 1EThe direction of the shot body is set as the reference direction), and one end communicates with the vacuum channel 108 of the gun body 110. In some embodiments, the barrel assembly 150 includes a connecting member 940, which can be used to connect the barrel 920 and the air pipe 930. For example, the connecting member 940 is disposed at the bottom of the barrel and the air pipe and penetrates through the air pipe and the vacuum channel of the barrel. In some embodiments, the connecting member 940 includes a through hole 941, which can connect the vacuum channel 921 of the barrel with the vacuum channel 108 of the gun body 110. For example, the connecting member 940 can be a screw including a through hole.

[0102] According to an embodiment of the present application, on both sides of the connecting member 940, a plurality of sealing rings 901 can be included between the barrel and the air pipe and between the air pipe and the gun body, and the air pipe includes a plurality of limiting grooves 931, which will not be elaborated here.

[0103] In some embodiments, one end of the air pipe 930 is connected to the venturi valve 910, and the other end is trumpet-shaped, which can be used to collect the oil vapor in the oil gun and recycle the oil vapor back to the fuel dispenser through the gas channel of the gun body. For example, the air pipe includes an opening 932, which is disposed below the air pipe 930 and corresponds to the position of the gas channel of the gun body 110. In some embodiments, the air pipe 932 is a split air pipe, that is, the air pipe is composed of multiple parts spliced together. For example: collecting the gas in the fuel tank is one part, and the connection part with the gun body is one part, and the two can be connected into one body by a plurality of screws, which is beneficial to the assembly of the barrel assembly and convenient for replacement and maintenance.

[0104] Furthermore, the barrel assembly 150 can also include a gas collecting hood 950, which is sleeved outside the air pipe and can be attached to the fuel filling port of the fuel tank to prevent the oil vapor from overflowing into the air and the oil from splashing outside the fuel tank. According to an embodiment of the present application, multiple corrugations are provided on the gas collecting hood 950, which is beneficial to buffering the force when the oil gun extends into the fuel tank. According to an embodiment of the present application, the material of the gas collecting hood 950 is a flexible or partially flexible material. For example: rubber, silicone, plastic, etc.

[0105] The above details each part of the oil gun of the present application. As understood by those skilled in the art, there are only two existing refueling methods, namely fixed-amount refueling and filling the fuel tank. The working process of the above components of the oil gun will be described below through these two methods.

[0106] In a case where fixed-amount refueling is performed, after the refueling amount is input into the fuel dispenser, the fuel dispenser supplies oil through a hose to the valve assembly of the fuel gun. Since the valve core of the oil circuit valve is not opened, the oil will not flow into the liquid passage of the gun body, but will flow into the vacuum cap through the oil pressure passage of the gun body, pushing the piston towards the driving mechanism, and then the shifting pin can be engaged into the driving mechanism. At this time, if the trigger is pulled, the drive shaft sleeve will move towards the valve assembly together with the drive shaft, and then the valve core of the oil circuit valve can be opened. Further, the oil will flow to the Venturi valve along the liquid passage of the gun body, push the valve core of the Venturi valve, and after flowing through the Venturi valve, enter the gun barrel and flow into the fuel tank. When the predetermined amount is reached or almost reached, the fuel dispenser stops discharging oil or reduces the oil discharge amount, and the oil pressure in the hose decreases. The restoring force of the self-sealing spring in the vacuum cap is greater than the oil pressure, which will push the piston away from the driving mechanism, causing the shifting pin to disengage from the driving mechanism. The valve core of the oil circuit valve will be pushed back to the closed position of the oil circuit valve by the return spring. The oil cannot pass through the oil circuit valve, and refueling stops. Thus, fixed-amount refueling is achieved.

[0107] In some embodiments, protrusions or depressions are added between the cap body of the vacuum cap and the piston to increase the contact area with the oil. When the oil pressure decreases, due to the friction between the oil, it prevents the shifting pin from quickly disengaging from the driving mechanism due to too rapid a change in the oil pressure, so that the valve core of the oil circuit valve will be pushed back to its original position by the return spring, causing the fuel gun to "jump" (i.e., stop discharging oil before the predetermined amount is reached). In a further embodiment, the oil in the oil circuit valve enters the oil pressure passage through the gap between the oil circuit valve and the gun body. Since the gap between the two is small, it will also increase the friction with the oil, preventing "jumping" caused by too rapid a change in pressure.

[0108] In another case, refueling stops when the fuel tank is full. After the fuel dispenser supplies the oil through the hose to the valve assembly of the fuel gun, since the valve core of the oil circuit valve is not opened, the oil will not flow into the liquid channel of the gun body. Instead, it will flow into the vacuum cap through the oil pressure channel of the gun body, pushing the piston to move in the direction of the driving mechanism. As a result, the shifting pin can be engaged into the driving mechanism. When the trigger is pulled, the drive bushing will move towards the valve assembly together with the drive shaft, thus opening the valve core of the oil circuit valve. The oil will flow through the liquid channel of the gun body to the Venturi valve, pushing the valve core of the Venturi valve and flowing through the Venturi valve into the barrel and then into the fuel tank. When the oil flows through the Venturi valve, the "Venturi" effect will be generated, and the Venturi valve will supplement the air in the fuel tank through the vacuum channel of the gun body and the vacuum channel of the barrel. When the oil covers the vacuum channel opening of the barrel, the oil will be sucked into the Venturi valve. Therefore, the Venturi valve cannot supplement air from the vacuum channel, and the air between the diaphragm and the cap body in the vacuum cap will be sucked out through the air pressure channel of the gun body. When the Venturi valve sucks the air between the cap body and the diaphragm, the diaphragm will be sucked to move away from the driving mechanism, thus driving the shifting pin to move synchronously and disengaging it from the driving mechanism. The valve core of the oil circuit valve will be pushed by the return spring to return to the closed position of the oil circuit valve, and the oil cannot pass through the oil circuit valve. Thus, refueling stops when the fuel tank is full.

[0109] In some embodiments, the channels through which the oil flows in the fuel gun of the present application are designed to be as simple and straight as possible. The oil enters from the oil inlet of the gun body and flows out from the barrel, with the flow direction changing by 135° to 150°. Therefore, the energy loss of the oil during the flow process is small, and eddy currents are not easily generated, which can effectively improve the flow rate of the oil gun.

[0110] The above embodiments are only for illustrating the present invention and are not intended to limit the present invention. Those of ordinary skill in the relevant technical field can still 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 disclosure of the present invention.

Claims

1. A fuel dispenser nozzle, comprising: A gun body, which includes a liquid passage for supplying fuel liquid to pass through; A valve assembly, which is arranged in the valve assembly cavity of the gun body and is configured to allow or block the fuel liquid from passing through the liquid passage; A driving mechanism, which is arranged in the driving mechanism cavity of the gun body and is configured to control the opening or closing of the valve assembly; And A barrel assembly, at least part of which is arranged in the barrel assembly cavity of the gun body and is configured to accommodate the liquid passage; wherein, the barrel assembly includes a Venturi valve, which is arranged in the barrel assembly cavity; the barrel assembly includes a barrel, one end of which is connected to the Venturi valve and the other end is arranged outside the gun body; the Venturi valve includes a valve seat and a valve core, wherein, one end of the valve seat is connected to the liquid passage of the gun body and the other end is connected to the barrel; the valve core acts on the valve seat to block the fuel liquid from passing through; the valve seat is a split valve seat, one part of which is in contact with the valve core and the other part is not in contact with the valve core, and the two are connected into a whole through threads; A vacuum passage, which communicates the Venturi valve with the outside of the fuel dispenser nozzle and is configured to supplement gas to the Venturi valve; wherein, the vacuum passage includes a first part extending along the barrel and a second part located in the gun body; The gun body further includes a gas passage, which is configured to recycle the collected fuel vapor back to the fuel dispenser; wherein the barrel assembly further includes an air pipe at least part of which extends along the barrel, and the air pipe communicates with the gas passage in the gun body; A connecting piece, which fixedly connects the air pipe to the barrel or the Venturi valve, and the connecting piece is further configured to connect the first part of the vacuum passage extending along the barrel and the second part of the vacuum passage in the gun body while fixing the air pipe to the barrel, but keep the vacuum passage not communicating with the gas passage.

2. The fuel dispenser nozzle according to claim 1, wherein the valve assembly cavity and the driving mechanism cavity are on the same axis, and the barrel assembly cavity is not on the same axis as the valve assembly cavity and the driving mechanism cavity.

3. The fuel dispenser nozzle according to claim 1, wherein the included angle between the Venturi valve and the driving mechanism is an obtuse angle.

4. The fuel dispenser gun according to claim 1, wherein, The first part of the vacuum passage is integral with the barrel.

5. The fuel dispenser nozzle according to claim 1, further comprising an attitude device, which is arranged in the second part of the vacuum passage and is configured to control the on-off of the vacuum passage according to different angles of the fuel dispenser nozzle.

6. The fuel dispenser nozzle according to claim 5, wherein the attitude device includes a moving part that can move freely along the second part of the vacuum passage; when the inlet and outlet of the second part of the vacuum passage are on one side of the moving part, the vacuum passage is communicated; when the inlet and outlet of the second part of the vacuum passage are on both sides of the moving part, the vacuum passage is blocked by the moving part.

7. The fuel dispenser gun according to claim 1, further comprising: A vacuum cap, which is arranged in the vacuum cap cavity of the gun body and is configured to lock the driving mechanism to make the driving mechanism in an available state; wherein, there is a pressure passage between the vacuum cap cavity and the Venturi valve.

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