A fuel gun

Abstract

The present invention relates to a fuel dispenser nozzle, comprising: a gun body, which includes a liquid passage for supplying liquid to pass through and a gas passage for the collected oil vapor to return to the fuel dispenser; a valve assembly, which is arranged in the gun body and includes an oil circuit valve and a gas circuit valve; wherein, the oil circuit valve is configured to allow or block the oil to pass through the liquid passage, and the gas circuit valve is configured to allow or block the oil vapor to pass through the liquid passage; and a driving mechanism, which is arranged in the gun body and is configured to control the oil circuit valve and the gas circuit valve to open or close simultaneously. The fuel dispenser nozzle of the present invention has a compact structure, reasonable design, convenient assembly, and can greatly reduce the maintenance cost.

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 installed 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 gas stations are mostly volatile and have certain toxicity, and their ignition points are very low, making them easily ignited, posing potential safety hazards. With the increasingly high environmental protection requirements, the requirements for environmental protection and safety in gas stations are also getting higher and higher. In order to minimize the oil vapor inside and around the gas station, the oil vapor recovery technology has been popularized, and fuel guns with oil vapor recovery functions have been widely used. However, the existing fuel guns with oil vapor recovery functions have a short development time, unreasonable structures, complex assemblies, are prone to failures, and have relatively high maintenance costs. Summary of the Invention

[0004] Aiming at the technical problems existing in the prior art, the present invention provides a fuel gun, including: a gun body, which includes a liquid passage for supplying oil and a gas passage for returning the collected oil vapor to the fuel dispenser; a valve assembly, which is arranged inside the gun body and includes an oil valve and a gas valve; wherein, the oil valve is configured to allow or block the passage of oil through the liquid passage, and the gas valve is configured to allow or block the passage of oil vapor through the liquid passage; and a driving mechanism, which is arranged inside the gun body and is configured to control the simultaneous opening or closing of the oil valve and the gas valve.

[0005] The fuel gun as described above, wherein the oil valve and the gas valve are integrated or can be fixedly connected as a whole.

[0006] The fuel gun as described above, wherein the oil valve includes an oil valve seat and an oil valve core, the gas valve includes a gas valve seat and a valve rod, the gas valve seat further includes an inner ring and an outer ring, the inner ring is the gas passage, and the outer ring is the liquid passage; wherein, the outer wall of the gas valve seat is connected to the oil valve seat, the first end of the valve rod is connected to the oil valve core, and the second end of the valve rod is located inside the inner ring and is configured to be able to close the gas passage of the inner ring.

[0007] The fuel gun as described above further includes: a first return spring, whose first end abuts against the oil valve core and whose second end abuts against the inner ring.

[0008] The fuel dispenser as described above, wherein a sealing seat is included between the second end of the valve stem and the inner ring.

[0009] The fuel dispenser as described above, further comprising: a second return spring, the first end of which abuts against the valve stem and the second end of which abuts against the sealing seat.

[0010] The fuel dispenser as described above, further comprising: a positioning ring, which is arranged outside the air valve and is configured to lock the position of the valve assembly.

[0011] The fuel dispenser as described above, further comprising: a flow guiding cone, which is arranged between the oil path valve core and the driving mechanism and whose diameter gradually decreases along the oil flow direction.

[0012] The fuel dispenser as described above, wherein the driving mechanism comprises: a fixed shaft sleeve; a driving shaft sleeve, which is adapted to be assembled in the fixed shaft sleeve; and a driving shaft, which is adapted to be assembled in the driving shaft sleeve; wherein, when the driving shaft and the driving shaft sleeve are in a locked state, the driving shaft can push the driving shaft sleeve to move axially; when the driving shaft and the driving shaft sleeve are in a non-locked state, the driving shaft can move axially relative to the driving shaft sleeve.

[0013] The fuel dispenser as described above, further comprising: a barrel assembly, which comprises a barrel and a Venturi valve, wherein the axial direction of the Venturi valve is different from that of the driving mechanism.

[0014] The fuel dispenser as described above, further comprising: a vacuum channel, which communicates the Venturi valve with the outside of the fuel dispenser and is configured to supplement gas to the Venturi valve; wherein, the vacuum channel comprises a first part extending along the barrel and a second part located in the gun body; wherein, the first part of the vacuum channel is integral with the barrel.

[0015] The fuel dispenser as described above, further comprising: the barrel assembly further comprises an air pipe at least partially extending along the barrel, the air pipe communicates with the gas channel in the gun body, and the air pipe is fixedly connected to the barrel.

[0016] The fuel dispenser of the present invention has a compact structure, reasonable design, convenient assembly, low failure rate, and can greatly reduce the maintenance cost. 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 according to an embodiment of the present application;

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

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

[0021] Figure 4 Exploded 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 implementation

[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 that 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, similar reference numerals describe substantially similar components in different views. The specific embodiments of the present application are described in sufficient detail below to enable those of ordinary skill in the relevant art and technology to practice 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 path 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. By means of the trigger on the fuel nozzle, the opening and closing of the oil path valve can be controlled via the drive mechanism. The vacuum cap can lock the drive mechanism. In the fuel vapor recovery function, the vapor of the oil passes through the gas path valve through the gas channel and is recovered into the fuel dispenser. In the current design of the fuel nozzle, all the oil path valve, the Venturi valve, and the gas path valve are centrally arranged together, resulting in frequent changes in the flow path of the oil, a complex oil flow environment, and cumbersome assembly and high maintenance costs of the fuel nozzle.

[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 integral part 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 making the assembly and maintenance of the fuel nozzle 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 perspective 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 respectively, showing the cross-sectional shape of the fuel nozzle.

[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 thus 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 outlet of the gun body 110. The valve assembly 120 is configured to allow or block the passage of oil through the gun body 110, and to allow or block the passage of recovered oil 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 oil and / or oil 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 oil thereto.

[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 generally 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. This prevents the fuel gun from becoming too long and affecting its 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 oil to enter the fuel tank of the vehicle through the gun body 110; the gas channel 105 defines a passage for oil vapor to be recovered into the fuel dispenser through the gun body 110. In some embodiments, the portion of the liquid channel 104 in the drive mechanism chamber protrudes outward from the gun body to facilitate compensating for the oil channel occupied by the drive mechanism chamber, so that the flow area of the oil in the valve assembly is the same, avoiding the formation of a bottleneck in the flow area and loss of the energy of the oil.

[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, putting 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, putting 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. The trigger 160 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. One end of the conversion member 161 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 through the conversion member 161 to control 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 passage valve 310 and a gas passage valve 320; wherein, the oil passage 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 passage 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 passage valve 310 and the gas passage valve 320 are conical or yurt-shaped.

[0047] According to an embodiment of the present application, the oil passage valve 310 may be connected to the gas passage valve 320 integrally. In some embodiments, the two may also be integrally formed into a valve assembly 120 that can control both the liquid passage and the gas passage. Thus, the opening and closing of the oil passage valve 310 and the gas passage valve 320 can be controlled simultaneously. Therefore, although the structures of the oil passage valve 310 and the gas passage 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 the increase of the oil flow rate.

[0049] In some embodiments, the oil passage 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 passage valve further includes a return spring 313 for resetting the valve core, that is, pushing the valve core 311 to abut against the valve seat 312.

[0050] In some embodiments, the diameter of the liquid passage between the gun body 110 from the oil inlet to the oil passage 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 passage of the oil passage valve seat when the valve core has not passed through can reach Ф32mm, so as to support a relatively high flow rate. In some embodiments, the radius of the oil passage valve core is approximately the same as the radius of the liquid passage before the valve core has passed through, or the difference between the two is less than 5mm, thus ensuring the continuity of the liquid passage. In some embodiments, a large area around the valve seat 311 is hollowed out, and only a small amount of support is retained to increase the area of the oil passage in the oil passage 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 passage 106 on the gun body. When the oil enters the oil passage valve, before the valve core is opened, the oil can enter the groove 314 from the liquid passage in the oil passage valve 310 through the gap or reserved passage (not shown in the figure) between the oil passage valve 310 and the gun body 110, and then enter the oil pressure passage 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 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 and prevent the position of the sealing ring from changing during the installation process, affecting the sealing effect of the oil gun. The limiting groove 316 is provided on the outer side of the groove 314 (the side away from the valve core 312) to prevent oil leakage.

[0053] In some embodiments, the end of the oil passage 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 to prevent vortices from occurring after the oil passes 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 provided 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, which 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 its diameter is reduced, and is used to control the passage of oil vapor. One end of the valve stem 322 extends and is connected to 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 may be fixedly connected, for example: threaded connection. The valve stem 322 and the valve core 312 may also be movably connected, for example, directly abutted. In some embodiments, the outer diameter of the outer ring 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 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 the 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 and forms an inclined surface, which abuts against the corresponding reverse 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 are not in communication with the outer ring 323. Instead, they connect the outside of the valve seat 321 to 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, by 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 driving mechanism 130 to open the oil path valve 310 and the air path valve 320, both the return spring 313 and 329 are compressed. When the thrust of the driving mechanism 130 is removed, the return spring 313 and the return spring 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 acting forces of the return spring 313 and the return spring 329 and the pressure of the oil. When closing the oil path valve and the air path valve, the acting forces of the return spring 313 and the return spring 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 the service life of the oil gun can be greatly extended.

[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 liquid 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 liquid coming out of the fuel dispenser is likely to 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 liquid 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 liquid. 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 liquid channel in the valve assembly remains unchanged or changes little, thus not causing energy loss of the oil liquid and increasing the flow rate of the fueling gun; and, the valve seat of the oil path valve is as hollow as possible, further increasing the cross-sectional area of the oil liquid 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 can push the valve core 312 of the oil path valve 310 to open the gas path valve 320 at the same time, so that the two can act uniformly, ensuring that the oil liquid vapor can be recovered while opening the oil liquid 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] Refer to Figures 1D - 1F 、 Figures 5A - 5D and Figure 6, the drive mechanism 130 includes a fixed sleeve 510, a drive sleeve 520, and a drive shaft 530; wherein, the drive shaft 530 is adapted to be assembled in the drive sleeve 520; one end of the drive sleeve 520 in contact with the drive shaft 530 is adapted to be assembled into the fixed sleeve 510; correspondingly, the other end of the drive shaft 530 is also adapted to be assembled into the fixed sleeve 510 to form a stacked assembly structure. In some embodiments, the fixed sleeve 510 is fixed in the drive mechanism cavity of the gun body 110, and the drive sleeve 520 and the drive shaft 530 can respectively reciprocate along the axis direction of the fixed sleeve.

[0066] According to an embodiment of the present invention, the fixed sleeve 510 is generally cylindrical as a whole, with a hollow interior. The first end includes an opening 511 for accommodating the drive sleeve 520 to extend into the interior of the fixed sleeve 510. In some embodiments, the second end of the fixed sleeve 510 is conical, which is convenient for the fixed sleeve 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 sleeve 510 further includes openings 512 and 513, which are oppositely arranged on both sides of the fixed sleeve 510 and extend from the second end of the fixed sleeve 510 towards the middle of the fixed sleeve 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. 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 from the opening 103 on the gun body into the openings 512 and 513 on the fixed sleeve 510, 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, the opening 512, and the opening 513, and then can push the drive sleeve 520 to move on the axis of the fixed sleeve 510.

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

[0069] In some embodiments, the fixed bushing 510 may further include a strip-shaped opening 515 provided at the bottom of the fixed bushing 510 for accommodating the limiting 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 limiting rod 502 to prevent axial rotation among the three and change the relative positions among them. When the drive shaft 530 or the drive bushing 520 moves in the fixed bushing, the limiting rod 502 also moves correspondingly in the strip-shaped opening 515. The limiting 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 limiting rod 502 and the drive shaft 530 may also be in other ways. For example: snap connection, adhesion, interference fit or transition fit, etc.

[0070] In some embodiments, the fixed bushing 510 may further include an opening 516 provided above the fixed bushing 510 and located between the recess 514 and the first end of the fixed bushing 510 for accommodating the gear 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 limiting groove 519 for accommodating 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 drive bushing 520 is generally cylindrical in shape as a whole, and is hollow inside 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 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 diversion cone 317 (for example, contacts the protrusion 318 of the diversion cone 317), which is used to push the diversion cone 317 or the valve core 312, facilitating an increase in the distance between the drive mechanism and the diversion cone and facilitating the drive mechanism to push the diversion 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 and prevent it from rotating, facilitating the determination of 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 provided above the drive shaft sleeve 520 and near the middle of the drive shaft sleeve 520, and is used to accommodate the shifting pin of the vacuum cap shifting 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 shifting pin of the vacuum cap shifting 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 realizes "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 shifting pin of the vacuum cap shifting pin seat leaves the opening 524 and / or the opening 531, the drive shaft and the drive shaft sleeve are separated. 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 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, bar, 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 shifting pin of the vacuum cap shifting 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 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 causes the driving shaft to move, but the driving shaft sleeve does 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. Pulling the trigger can cause the driving mechanism to 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, "shift gears" for 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 a thread 714, which can connect the cap 710 to the vacuum cap cavity of the gun body 110. Correspondingly, there is a thread 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 by a threaded key is just one implementation in the art, and other existing implementations in the art 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 also includes a hollow 715, which is beneficial to reducing the weight of the cap and the cost of the oil gun.

[0081] In some embodiments, the base 720 includes one or more limit blocks 721, which are spaced on the circumference of the base 720 and close to the cap 710 side, 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 limit 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 inner space of the vacuum cap through the oil pressure channel 106.

[0083] In some embodiments, the cap 710 may also 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. Figure 7C Taking the setting direction of the vacuum cap as the reference direction. In some embodiments, the cap 710 may also include a plurality of limit 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 channel 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 gently.

[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 the 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 it 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, silica gel, 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 channel on the base 720 communicates with this gas part.

[0088] In some embodiments, the vacuum cap may further include a gun-jumping spring 703 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 disposed on both sides of the diaphragm, which 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 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 gearshift pin seat 750 disposed below the diaphragm and moving up and down with the diaphragm. A gearshift pin 752 is disposed in the gearshift pin seat 750 and can move linearly in the gearshift pin seat. In some embodiments, the gearshift pin seat further includes tracks 753 and 754. The gearshift pin 752 can move along the track 753 and the track 754 to ensure the position accuracy of the movement. As described above, the gearshift pin seat 750 coincides with the opening 516 of the fixed bushing 510. When the gearshift pin seat 750 falls into the opening 516 of the fixed bushing, the gearshift pin can fall into the drive shaft opening 531 and the drive shaft sleeve opening 524, forming a whole of 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 gearshift 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 pass through the gun-jumping spring and extend into the spring seat and be connected to the spring seat, which is beneficial to strengthening the connection with the gearshift 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 gearshift pin of the gearshift 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 lifting the diaphragm, driving the gearshift pin seat to move upward, so that the gearshift 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 gearshift pin seat to move upward, so that the gearshift 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 , the barrel assembly 150 includes a Venturi valve 910, a barrel 920, and an air pipe 930. Among them, the Venturi valve 910 is arranged at one end of the barrel 920, and the other end of the barrel 920 can be inserted into the fuel tank of the vehicle. The air pipe 930 is sleeved outside the barrel 920 and is used to recover the oil vapor. One end of the air pipe 920 is communicated with the gas channel, and the other end can also extend into the fuel tank of the vehicle and is slightly open to the outside to be suitable for recovering the oil vapor.

[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 through threaded connections. In some embodiments, the air pipe can also be fixed to the barrel 920 or the Venturi valve 910 in other connection ways, such as: welding, clamping, or transitional assembly, etc.

[0095] In some embodiments, the Venturi valve 910 includes a valve seat 911 and a valve core 912. Among them, one end of the valve seat is connected to the liquid channel 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 and can block the oil from passing through. 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 channels in the oil gun are 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 multiple spliced parts. For example: the part in contact with the valve core is one part, the part not in contact with the valve core is one part, and the two are connected into a whole through threaded connections. 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 communicate the contact part between the valve seat 911 and the valve core 912 with 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 bullet body setting is 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 connector 940, which can be used to connect the barrel 920 and the air pipe 930. For example, the connector 940 is arranged 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 connector 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 connector 940 can be a screw including a through hole.

[0102] According to an embodiment of the present application, on both sides of the connector 940, there can be a plurality of sealing rings 901 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 arranged 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, there are multiple corrugations 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, silica gel, plastic, etc.

[0105] The above has described in detail 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 one case, during fixed-amount refueling, 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 path valve is not opened, the oil will not flow into the liquid channel of the gun body, but will flow into the vacuum cap through the oil pressure channel of the gun body, pushing the piston towards the drive mechanism, and then the shifting pin can be engaged into the drive 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 path valve can be opened. Further, the oil will flow through the liquid channel of the gun body to the Venturi valve, push the valve core of the Venturi valve, and flow into the fuel tank through the barrel after flowing through the Venturi valve. 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, and it will push the piston to move away from the drive mechanism, causing the shifting pin to disengage from the drive mechanism. The valve core of the oil path valve will be pushed back to the closed position of the oil path valve by the return spring. The oil cannot pass through the oil path 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 oils, it prevents the shifting pin from quickly disengaging from the drive mechanism due to too rapid a change in the oil pressure, so that the valve core of the oil path valve will be pushed back to its original position by the return spring, causing the fuel gun to "jump" (i.e., the fuel gun stops discharging oil before the predetermined amount is reached). In a further embodiment, the oil in the oil path valve enters the oil pressure passage through the gap between the oil path valve and the gun body. Since the gap between the two is small, it will also increase the friction with the oil and prevent "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 towards the driving mechanism. Subsequently, the shifting pin can be engaged with the driving mechanism. When the trigger is pulled, the drive shaft sleeve will move towards the valve assembly together with the drive shaft, thereby 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, flowing through the Venturi valve, entering the barrel, and then flowing into the fuel tank. When the oil flows through the Venturi valve, the "Venturi" effect will be generated. The Venturi valve replenishes 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 replenish air from the vacuum channel and will suck out the air between the diaphragm and the cap body in the vacuum cap 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, thereby 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 eddies 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 nozzle body, which includes a liquid passage for supplying liquid to pass through and a gas passage for the collected oil vapor to return to the fuel dispenser; A valve assembly, which is arranged in the nozzle body and includes an oil circuit valve and a gas circuit valve; wherein, the oil circuit valve is configured to allow or block the passage of oil through the liquid passage, and the gas circuit valve is configured to allow or block the passage of oil vapor through the liquid passage; and A driving mechanism, which is arranged in the nozzle body and is configured to control the simultaneous opening or closing of the oil circuit valve and the gas circuit valve; Wherein, the oil circuit valve includes a valve seat, a valve core and a first return spring. One end of the valve core is coupled to the driving mechanism. When the valve core abuts against the valve seat, the oil will be prohibited from passing through the fuel dispenser nozzle; when the driving mechanism pushes the valve core away from the valve seat, the oil will be allowed to pass through. The first return spring is used to reset the valve core; the oil circuit valve further includes a flow guiding cone, which has protrusions thereon for contacting the driving mechanism, and one or more platforms are arranged on the protrusions on the side thereof; Wherein, the gas circuit valve includes a valve seat, a valve rod and a second return spring; wherein, the valve seat includes an outer ring and an inner ring. The outer ring is for the passage of oil, and the inner ring is for the passage of oil vapor; a part of the valve rod is arranged in the valve seat after its diameter is reduced for controlling the passage of oil vapor; one end of the valve rod extends and is connected to the valve core. The second return spring is sleeved on the valve rod and is located in the first return spring; The gas circuit valve includes a sealing seat, which is arranged between the valve rod and the valve seat. The sealing seat is fixed on the valve seat through a plurality of limiting grooves thereon for isolating the liquid passage and the gas passage of the gas circuit valve; wherein, the diameter of the valve rod is reduced to form an inclined surface, which abuts against the corresponding inclined surface in the sealing seat to form a valve structure with a larger contact surface of the gas circuit valve; when the valve rod contacts the sealing seat, the oil vapor will be prohibited from passing through the gas passage, and when the valve rod slides out of the sealing seat, the oil vapor will be allowed to pass through the gas passage; one end of the second return spring is arranged on the valve rod, and the other end is arranged on the sealing seat. The second return spring resets the gas circuit valve by pushing the valve rod; Wherein, the valve seat includes one or more holes, which pass through the outer ring of the valve seat but are not communicated with the outer ring, but communicate the outside of the valve seat with the inner ring of the valve seat and can be used for accommodating the passage of oil vapor; one end of the first return spring is arranged on the valve core, and the other end is arranged on the inner ring wall of the valve seat of the gas circuit valve. The positions of the inner ring wall and the sealing seat remain unchanged. When the driving mechanism opens the oil circuit valve and the gas circuit valve, both the first return spring and the second return spring are compressed; when the thrust of the driving mechanism is removed, the first return spring and the second return spring return to their original states and reset the valve core and the valve rod respectively.

2. The fuel dispenser nozzle according to claim 1, wherein the oil circuit valve and the gas circuit valve are integrated or can be fixedly connected as a whole.

3. The fuel dispenser gun according to claim 2, further comprising: A positioning ring, which is arranged outside the gas circuit valve and is configured to lock the position of the valve assembly.

4. The fuel dispenser gun according to claim 1, further comprising: A flow guiding cone, which is arranged between the oil circuit valve core and the driving mechanism and gradually decreases in diameter along the oil flow direction.

5. The fuel dispenser nozzle according to claim 1, wherein the driving mechanism includes: A fixed shaft sleeve; A driving shaft sleeve, which is adapted to be assembled in the fixed shaft sleeve; And A driving shaft, which is adapted to be assembled in the driving shaft sleeve; Wherein, when the drive shaft and the drive shaft sleeve are in a locked state, the drive shaft can push the drive shaft sleeve to move axially; when the drive shaft and the drive shaft sleeve are in an unlocked state, the drive shaft can move relative to the drive shaft sleeve axially.

6. The fuel dispenser gun according to claim 1, further comprising: A barrel assembly, which includes a barrel and a Venturi valve, wherein the axial direction of the Venturi valve is different from that of the drive mechanism.

7. The fuel gun according to claim 6, further comprising: A vacuum passage, which communicates the Venturi valve with the outside of the fueling gun 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; wherein, the first part of the vacuum passage is integral with the barrel.

8. The fuel dispenser gun according to claim 6, further comprising: The barrel assembly further includes an air pipe at least partially extending along the barrel, the air pipe communicates with a gas passage in the gun body, and the air pipe is fixedly connected to the barrel.

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