A refueling gun

Abstract

The present invention relates to a vacuum cap for a refueling gun and the refueling gun. The vacuum cap comprises: a cap body including a cavity; a base located at an opening of the cavity of the cap body; a piston disposed in the cavity of the cap body, wherein the cap body and the piston define an oil portion of the vacuum cap; wherein the cap body or the piston includes one or more grooves or protrusions; a diaphragm disposed on a side of the base away from the cap body, wherein the piston and the diaphragm define a gas portion of the vacuum cap; and a gear pin seat that operates in conjunction with the diaphragm. The present invention significantly reduces the occurrence of accidental ejection of the refueling gun through an optimized vacuum cap design, thereby improving refueling efficiency.

Description

Technical Field

[0001] The present invention relates to the field of refueling equipment, in particular to a refueling gun. Background Art

[0002] With the advancement of technology and rising living standards, cars are increasingly entering millions of households. This growing number of cars has led to a continuous expansion of gas stations. In everyday life, a gas station consists of underground fuel tanks and multiple refueling stations connected to the tanks. Each refueling station uses a nozzle to fill cars with fuel.

[0003] For a long time, the oil vapor generated during the refueling process will be emitted into the air in or near the gas station. However, most of the oil products such as gasoline or diesel at gas stations are volatile and have certain toxicity, and their flash point is very low, making them easily ignited, posing a safety hazard. With the increasing demand for environmental protection, the requirements for environmental protection and safety issues at gas stations are also getting higher and higher. In order to minimize the oil vapor in and around gas stations, oil and gas recovery technology has become popular, and refueling guns with oil and gas recovery functions are widely used. However, the existing refueling guns with oil and gas recovery functions have a short development time, and their structures are not reasonable enough. Accidental gun jumps often occur, affecting refueling efficiency. Summary of the Invention

[0004] In response to the technical problems existing in the prior art, according to one aspect of the present invention, a vacuum cap for a refueling gun is proposed, comprising: a cap body, which includes a cavity; a base, which is located at the cavity opening of the cap body; a piston, which is arranged in the cavity of the cap body, wherein the oil part of the vacuum cap is defined between the cap body and the piston; wherein the cap body or the piston includes one or more grooves or protrusions; a diaphragm, which is arranged on the side of the base away from the cap body, wherein the gas part of the vacuum cap is defined between the piston and the diaphragm; and a gear pin seat, which acts together with the diaphragm.

[0005] In the vacuum cap as described above, one side of the cap body or the piston includes a plurality of grooves, and the other side of the cap body or the piston includes a plurality of protrusions corresponding thereto.

[0006] The vacuum cap as described above, wherein one or more grooves or protrusions between the cap body or the piston define a channel for oil to enter and withdraw from the oil portion of the vacuum cap.

[0007] In the vacuum cap as described above, the passage for oil to enter and withdraw from the oil portion of the vacuum cap is in the shape of a multi-layer ring.

[0008] The vacuum cap as described above, wherein one or more grooves or protrusions between the cap body or the piston define the speed at which the oil enters and withdraws from the oil portion of the vacuum cap.

[0009] As described above, in the vacuum cap, as the oil pressure of the liquid part changes, the piston drives the diaphragm to move up and down, causing the gear pin in the gear pin seat to move up and down; as the air pressure of the gas part changes, the diaphragm moves up and down, causing the gear pin in the gear pin seat to move up and down.

[0010] The vacuum cap as described above further comprises: a spring seat and a self-sealing spring between the spring seat and the base, wherein the spring seat is arranged in the gas portion of the vacuum cap.

[0011] The vacuum cap as described above further comprises: a jump gun spring between the spring seat and the diaphragm.

[0012] In the vacuum cap as described above, the base includes a plurality of limit blocks, which are arranged at the edge of the base and configured to define a distance between the base and the cap body; wherein the gaps between the limit blocks define channels for entering and exiting the gas portion.

[0013] The vacuum cap as described above further comprises: a connecting piece, which is arranged between the diaphragm and the gear engaging pin seat.

[0014] The vacuum cap as described above, wherein the shift pin seat includes a shift pin, and the shift pin is configured to slide along the track.

[0015] According to another aspect of the present invention, a refueling gun is proposed, comprising: a gun body, which includes a liquid channel for oil to pass through; a valve assembly, which is arranged in the valve assembly cavity of the gun body and is configured to allow or prevent oil from passing through the liquid channel; a drive mechanism, which is arranged in the drive mechanism cavity of the gun body and is configured to control the opening or closing of the valve assembly; and a vacuum cap as described above, which is arranged in the vacuum cap cavity of the gun body and is configured to lock the drive mechanism so that it is in an available state.

[0016] The fueling gun as described above, wherein the liquid passage includes a branch from the valve assembly chamber to the vacuum cap chamber as described above, the vacuum cap oil portion.

[0017] As described above, the refueling gun, wherein the valve assembly includes an oil circuit valve, one side of the oil circuit valve includes a groove connected to the vacuum cap cavity, and the oil enters the groove through the gap or passage of the oil circuit valve cavity, wherein the gap or passage of the oil circuit valve cavity is designed to control the flow rate of the oil.

[0018] The fuel gun as described above further comprises a barrel assembly, the barrel assembly comprising a venturi valve, wherein a gas pressure channel is provided between the venturi valve and the gas portion of the vacuum cap as described above.

[0019] The fueling gun as described above further comprises: a vacuum channel, which connects the Venturi valve with the outside of the fueling gun, wherein the vacuum channel extends along the barrel of the barrel assembly.

[0020] This application proposes a newly designed refueling gun. By optimizing the design of the vacuum cap, the occurrence of gun jumping in the refueling gun of this application is greatly reduced, thereby improving refueling efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Below, the preferred embodiments of the present invention will be further described in detail with reference to the accompanying drawings, in which:

[0022] Figure 1A-1F This is a schematic structural diagram of a refueling gun according to one embodiment of the present application;

[0023] Figure 2 An exploded view of a fuel gun structure according to one embodiment of the present application;

[0024] Figures 3A-3D Schematic diagram of a valve assembly according to one embodiment of the present application;

[0025] Figure 4 is an exploded view of a valve assembly according to one embodiment of the present application;

[0026] Figures 5A-5D Schematic diagram of a driving mechanism according to one embodiment of the present application;

[0027] Figure 6 An exploded view of a driving mechanism according to one embodiment of the present application;

[0028] Figures 7A-7D Schematic diagram of a vacuum cap according to one embodiment of the present application;

[0029] Figure 8 An exploded view of a vacuum cap according to one embodiment of the present application;

[0030] Figures 9A-9D is a schematic diagram of a barrel assembly according to one embodiment of the present application; and

[0031] Figure 10 The figure is an exploded view of a barrel assembly according to one embodiment of the present application. DETAILED DESCRIPTION

[0032] To make the objectives, technical solutions, and advantages of the embodiments of the present invention more clear, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts shall fall within the scope of protection of the present invention.

[0033] In the detailed description that follows, reference may be made to the various drawings that form part of this application and illustrate specific embodiments of the present application. In the drawings, similar reference numerals describe substantially similar components in different figures. Each specific embodiment of the present application is described below in sufficient detail to enable a person of ordinary skill in the art to implement the technical solutions of the present application. It should be understood that other embodiments may be utilized or that structural, logical, or electrical changes may be made to the embodiments of the present application.

[0034] The fuel gun (also called a "fuel gun") is connected to the fuel dispenser via a hose. Fuel enters the gun through the hose, passes through the fuel line valve and Venturi valve inside the gun, and then flows out of the barrel into the vehicle's fuel tank. The trigger on the gun controls the opening and closing of the fuel line valve via a drive mechanism. A vacuum cap locks the drive mechanism. During the oil vapor recovery function, oil vapor is recovered through the gas channel and the gas line valve back to the fuel dispenser.

[0035] This application proposes a newly designed fueling gun, which further optimizes the design of the vacuum cap, so that the occurrence of gun jumping in the fueling gun of this application is greatly reduced, thereby improving the refueling efficiency.

[0036] The technical solution of this application is further described below through specific implementation methods. Those skilled in the art should understand that the following description is only for the purpose of facilitating the understanding of the technical solution of this application and should not be used to limit the scope of protection of this application.

[0037] Figure 1A-1F Schematic diagram of the structure of a refueling gun according to one embodiment of the present application. Figure 1A and Figure 1B The three-dimensional diagram of the fuel nozzle from different directions shows its overall shape; Figure 1C for Figure 1A The cross-section along line AA, Figure 1D-1F They are Figure 1C The cross-sectional views along lines BB, CC, and DD show the cross-sectional shape of the fueling gun. Figure 2 This is an exploded view of a fuel gun structure according to one embodiment of the present application.

[0038] As shown in the figure, the fuel gun 100 includes a gun body 110, which includes an oil inlet 101 and an oil outlet 102. The oil inlet 101 can be connected to a hose via an inlet thread, thereby connecting the fuel gun to the fuel dispenser. The fuel 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 one embodiment of the present application, the gun body 110 can be injection molded. According to one embodiment of the present application, the material of the gun body 110 is a metal or alloy such as aluminum or stainless steel.

[0039] As shown in the figure, the fuel pump nozzle 100 also includes a valve assembly 120, a drive mechanism 130, a vacuum cap 140, and a barrel assembly 150, located between the fuel inlet and outlet of the nozzle body 110. The valve assembly 120 is used to allow or prevent the flow of fuel through the nozzle body 110, as well as to allow or prevent the flow of recovered fuel vapor through the nozzle body 110. The drive mechanism 130 is connected to the valve assembly 120, controlling the opening and closing of the valve assembly 120 and, in turn, the flow of fuel and / or fuel vapor. The vacuum cap 140 locks the drive mechanism 130. When the drive mechanism 130 is locked, the drive mechanism 130 functions as a single unit and is operational. When the drive mechanism 130 is unlocked, the drive mechanism 130 is inoperable and cannot control the opening and closing of the valve assembly 120. The barrel assembly 150 is located at the front of the nozzle body 110 and can be inserted into a vehicle's fuel tank to add fuel.

[0040] In some embodiments, the gun body 110 also includes multiple chambers for accommodating the above-mentioned components of the refueling gun, including but not limited to: a valve assembly chamber for accommodating the valve assembly 120, a drive mechanism chamber for accommodating the drive mechanism 130, a vacuum cap chamber for accommodating the vacuum cap 140, and a barrel assembly chamber for accommodating at least part of the barrel assembly 150.

[0041] In some embodiments, the valve assembly cavity and the drive mechanism cavity are arranged roughly parallel to each other and share roughly the same axis to ensure that the liquid passages maintain a roughly consistent orientation. Furthermore, the barrel assembly cavity, the valve assembly cavity, and the drive mechanism cavity do not share roughly the same axis, but are angled to each other. This prevents the oil gun from becoming excessively long and hindering its use. In some embodiments, a Venturi valve is located in the barrel assembly cavity. The Venturi valve is closer to the barrel assembly than to the drive mechanism, and the Venturi valve and the drive mechanism do not share roughly the same axis.

[0042] In some embodiments, the gun body 110 may further include a liquid channel 104 and a gas channel 105 between the valve assembly cavity and the barrel assembly cavity. The liquid channel 104 defines the path for oil to flow through the gun body 110 and into the vehicle's fuel tank, while the gas channel 105 defines the path for oil vapor to be recovered from the gun body 110 and returned to the fuel dispenser. In some embodiments, the portion of the liquid channel 104 within the drive mechanism cavity protrudes outward from the gun body to compensate for the oil channel occupied by the drive mechanism cavity, ensuring that the flow area of the oil is equal to that of the valve assembly, thus avoiding the formation of a flow bottleneck and the loss of oil energy.

[0043] In some embodiments, the gun body 110 may further include an oil pressure channel 106 between the valve assembly chamber and the vacuum cap chamber, and an air pressure channel 107 between the vacuum cap chamber and the barrel assembly chamber. Oil enters the vacuum cap 140 through the oil pressure channel 106. The oil pressure provided by the oil can push the vacuum cap 140 to lock the drive mechanism 130, putting it into a usable state. One end of the air pressure channel 107 is connected to the vacuum cap chamber, and the other end is connected to the venturi valve. When the venturi valve extracts air from the vacuum cap 140 through the air pressure channel 107, the vacuum cap can be disengaged from the drive mechanism 130, causing it to enter a non-usable state.

[0044] In some embodiments, the fueling gun 100 further includes a trigger 160 located outside the gun body 110. This trigger 160 is connected to the drive mechanism 130 via a converter 161 and can be used to control the drive mechanism. In some embodiments, the converter 161 is also located outside the gun body, with one end connected to the trigger 160. The gun body 110 includes an opening 103 on one or both sides, and the other end of the converter 161 is connected to the drive mechanism 130 through the opening 103. In the locked state, when the trigger 160 is pulled, the drive mechanism 130 is pushed via the converter 161, thereby controlling the valve assembly 120.

[0045] In some embodiments, the refueling gun may also include a guard 164, which is located outside the trigger 160 and detachably connected to the gun body 110 to protect the operator's hands while refueling. In some embodiments, the guard 164 includes one or more pins 165 that engage the trigger 160, allowing the operator to secure the trigger 160 during refueling. Correspondingly, the trigger 160 also includes a snap-fit structure located at the rear of the trigger 160 that can be pushed and inserted into the pins of the guard 164, thereby providing different oil flow rates.

[0046] In some embodiments, the fueling gun 100 may further include a friction-reducing band 166 disposed on the gun body and positioned between the gun body and the conversion member. The friction-reducing band 166 may be made of materials such as felt, rubber, or plastic, and helps reduce friction between the conversion member 161 and the gun body 110 when the trigger 160 is pulled, making the triggering operation easier and smoother for the operator.

[0047] The following further illustrates the technical solution of the present invention through specific examples of each component. Those skilled in the art should understand that the description of these components is not intended to limit the solution of the present invention. Other components with similar functions can also be applied here and become part of the technical solution of the present invention.

[0048] Figures 3A-3D Schematic diagram of a valve assembly according to one embodiment of the present application. Figure 3A and Figure 3B The three-dimensional diagram of the valve assembly from different directions shows its overall shape; Figure 3CIt is a side view of the valve assembly, showing its side shape; Figure 3D for Figure 3C A cross-sectional schematic diagram showing its cross-sectional shape. Figure 4 1 is an exploded view of a valve assembly according to one embodiment of the present application.

[0049] refer to Figure 1D-1F 、 Figures 3A-3D as well as Figure 4 The valve assembly 120 is cylindrical as a whole, and includes an oil circuit valve 310 and an air circuit valve 320; wherein, the oil circuit valve 310 is arranged on the liquid channel 104 in the gun body 110, and is used to control the oil passing through the gun body 110; the air circuit valve 320 is arranged on the gas channel 105 of the gun body 110, and is used to control the recovery of oil vapor.

[0050] Of course, as those skilled in the art will appreciate, the valve assembly 120 may also have other shapes, such as a cone or a yurt, or one or both of the oil valve 310 and the gas valve 320 may be cone or yurt-shaped.

[0051] According to one embodiment of the present application, the oil valve 310 can be integrally connected to the gas valve 320. In some embodiments, the two can also be integrally formed, forming a valve assembly 120 that can control both the liquid and gas passages. This allows the opening and closing of the oil valve 310 and the gas valve 320 to be controlled simultaneously. Therefore, although the structures of the oil valve 310 and the gas valve 320 are described separately below, this does not mean that the two are separate structures.

[0052] In some embodiments, the gas channel deflects in direction within the valve assembly 120, while the direction of the liquid channel remains substantially unchanged. Furthermore, in some embodiments, in the valve assembly 120, the gas channel is located inside the liquid channel, which has a lower impact on the oil flow rate, allowing the liquid channel to occupy a larger cross-sectional area, thereby facilitating an increase in the oil flow rate.

[0053] 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 of the valve core is coupled to the drive mechanism 130. When the valve core 312 abuts against the valve seat 311, oil is prohibited from passing through the oil gun. When the drive mechanism 130 pushes the valve core 312 away from the valve seat 311, oil is allowed to pass. According to one embodiment of the present application, the oil circuit valve also includes a reset spring 313 for resetting the valve core, that is, pushing the valve core 311 against the valve seat 312.

[0054] In some embodiments, the diameter of the liquid passageway between the oil inlet and the oil circuit valve in the gun body 110 is roughly equivalent to the diameter of the oil inlet thread. For example, if the inlet thread can be M34×1.5, the diameter of the liquid passageway in the oil circuit valve seat before passing through the valve core can reach Ø32mm, thereby supporting a higher flow rate. In some embodiments, the radius of the oil circuit valve core is roughly the same as the radius of the liquid passageway before passing through the valve core, or the difference between the two is less than 5mm, thereby ensuring the continuity of the liquid passageway. In some embodiments, the valve seat 311 is largely hollowed out, retaining only a small amount of support, to increase the area of the oil circuit passageway in the oil circuit valve 310 and increase the flow rate of the oil gun.

[0055] In some embodiments, the outer side of the valve seat 311 near the valve core 312 includes a groove 314, the position of which corresponds to the position of the oil pressure passage 106 on the gun body. After oil enters the oil valve, but before the valve core opens, the oil can enter the groove 314 from the liquid channel within the oil valve 310 through the gap between the oil valve 310 and the gun body 110 or a reserved passage (not shown), and then enter the oil pressure passage 106 and reach the vacuum cap chamber in the gun body 110. In some embodiments, this gap or passage is designed to ensure that the flow rate of oil entering the vacuum cap chamber or returning from the vacuum cap chamber to the valve assembly chamber is a predetermined flow rate to prevent excessive changes in the oil pressure in the vacuum cap chamber.

[0056] In some embodiments, the valve seat 310 further includes a sealing ring 315 and a retaining groove 316. The retaining groove 316 is configured to accommodate the sealing ring 315. The retaining groove 316 defines the position of the sealing ring 315, preventing it from shifting during installation and potentially affecting the sealing performance of the oil gun. The retaining groove 316 is located outside the groove 314 (away from the valve core 312) to prevent oil leakage.

[0057] In some embodiments, the oil circuit valve 310 further includes a guide cone 317 at the end away from the oil inlet. For example, the guide cone 317 can be shaped like a yurt, tapering from larger to smaller along the direction of oil flow, rather than from smaller to larger. This configuration is designed to guide the oil passing through the valve core 312, preventing vortices and energy loss after the oil passes through the valve core. As those skilled in the art will appreciate, the guide cone 317 can also have other shapes, such as a multi-layered stepped shape. In one embodiment, the guide cone 317 can include a protrusion 318, which is configured to contact the drive mechanism 130, thereby increasing the distance between the guide cone and the drive mechanism and preventing collisions during assembly. In further embodiments, the protrusion 318 includes one or more platforms 319, located on the side of the protrusion 318, which can define the position of the guide cone and facilitate assembly and positioning of the components. In some embodiments, the protrusion 318 is integrally formed with the guide cone 317.

[0058] In some embodiments, the gas valve 320 includes a valve seat 321 and a valve stem 322. The valve seat 321 is annular and includes an outer ring 323 and an inner ring 324. The outer ring 323 allows oil to pass through, while the inner ring 324 allows oil vapor to pass through. A portion of the valve stem 322, with its diameter reduced, is positioned within the valve seat 321 to control the passage of oil vapor. One end of the valve stem 322 extends and connects to the valve core 312, facilitating the simultaneous opening of the oil and gas valves by the drive mechanism 130. The valve stem 322 and valve core 312 can be fixedly connected, for example, by threading. Alternatively, the valve stem 322 and valve core 312 can be flexibly connected, for example, by direct abutment. In some embodiments, the outer ring diameter of the valve seat 321 is the same as the diameter of the gun body's oil inlet, 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 approximately the same as the cross-sectional area of the liquid passageway before the oil flow valve passes through the valve core.

[0059] In some embodiments, the air circuit valve 320 further includes a sealing seat 327, which is arranged between the valve stem 322 and the valve seat 321. As shown in the figure, the sealing seat 327 can be fixed to the valve seat 321 through a plurality of limiting grooves 328 thereon. The sealing seat 327 is used to isolate the liquid channel and the gas channel of the air circuit valve to prevent the oil and oil vapor from mixing. It 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 connection part between the valve stem 322 and the valve core 312 can also be located in the sealing seat 327. Furthermore, one or more sealing rings are included between the sealing seat 327 and the valve stem 322, which can achieve sealing between the oil channel and the air channel. The sealing seat includes one or more limiting grooves, which are used to accommodate the sealing rings.

[0060] In one embodiment, the diameter of the valve stem 322 is reduced to form 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 with the air circuit valve 320. Of course, the valve stem 322 can also contact the sealing seat 327 by including a valve head with a larger diameter. When the valve stem 322 contacts the sealing seat 327, oil vapor is prohibited from passing through the air circuit. When the valve stem 322 slides out of the sealing seat 327, oil vapor is allowed to pass through the air circuit. 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 a sealing ring and can be used to limit the position of the sealing ring.

[0061] 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 connect to the outer ring 323. Instead, they connect the exterior of the valve seat 321 to the inner ring 324 of the valve seat, allowing for the passage of oil vapor. This deflects the gas passage in the inner ring 323, for example, vertically. Because gas flows more fluidly and has less resistance, this arrangement leaves more space for the liquid passage, reducing oil resistance and facilitating faster flow.

[0062] In some embodiments, the valve seat 321 may include grooves 326 near the multiple holes 325, which connect the multiple holes 325 to form a single unit. In some embodiments, the valve seat 321 further includes multiple sealing rings, which are positioned on both sides of the holes 325 or grooves 326 to seal the passage of oil vapor and prevent leakage. Furthermore, the valve seat 321 further includes multiple limiting grooves for accommodating the sealing rings. These grooves can be used to define the position of the sealing rings, preventing them from shifting during assembly and affecting the sealing effect of the oil gun.

[0063] In one embodiment, the gas circuit valve 320 further includes a return spring 329, which is mounted on the valve stem 322. In some embodiments, the return spring 329 is located within the return spring 313, with one end disposed on the valve stem 322, for example, at a portion of the connection with the valve core 312, and the other end disposed on the sealing seat 327. The return spring 329 resets the gas circuit valve 320 by pushing the valve stem 322, thereby pushing the end of the valve stem into the sealing seat. Of course, as will be appreciated by those skilled in the art, the return spring 329 may not be included when the valve stem is fixedly connected to the valve core.

[0064] In some embodiments, one end of the return spring 313 is mounted on the valve core, and the other end is mounted on the inner annular wall of the gas valve seat. The inner annular wall and the sealing seat remain stationary. When the oil gun trigger 160 pushes the drive mechanism 130 to open the oil valve 310 and the gas valve 320, both the return springs 313 and 329 are compressed. When the thrust of the drive mechanism 130 is removed, the return spring 313 and the return spring 329 return to their original positions, respectively restoring the valve core and valve stem. Therefore, opening the oil and gas valves requires overcoming the forces of the return springs 313 and 329 as well as the oil pressure. When closing the oil and gas valves, the forces of the return springs 313 and 329 simultaneously compress the oil and gas valves. This configuration not only provides a compact structure and facilitates assembly, but also effectively seals the oil and gas valves, significantly extending the service life of the oil gun.

[0065] In some embodiments, the valve assembly 120 may further include a positioning ring 330, which is disposed on a side of the gas valve, away from the oil valve, to define the position of the oil and gas valves. During installation, the oil valve 310 and the gas valve 320 can be pushed and installed into the valve assembly cavity of the gun body 110 by twisting the positioning ring 330. The positioning ring can further fix the position of the oil valve 310 and the gas valve 320 to prevent them from moving toward 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, thereby conveniently achieving installation and positioning of the valve assembly 120.

[0066] During the refueling process, the oil enters the oil circuit valve 310 from the outer ring of the air circuit valve 320, and then enters the vehicle's fuel tank. Due to problems such as corrosion of the internal pipelines of the fuel pump, the oil coming out of the fuel pump is likely to be mixed with some impurities. In some embodiments, the valve assembly also includes a filter 340, which is arranged between the positioning ring 330 and the air circuit valve 320, and is used to filter the oil coming out of the fuel pump to prevent impurities from entering the components of the fuel gun. For example, the filter 340 is annular, and its shape matches the shape of the cross-section of the air circuit valve seat, which can effectively filter impurities in the oil. Of course, as understood by those skilled in the art, the filter can also have other shapes.

[0067] In these embodiments of the present invention, the valve assembly 120 is cylindrical in shape as a whole. The cross-sectional area of the oil passage in the valve assembly remains unchanged or changes little, thereby preventing energy loss of the oil and increasing the flow rate of the oil gun. In addition, the valve seat of the oil circuit valve is hollowed out as much as possible, further increasing the cross-sectional area of the oil passage and improving the flow rate of the oil gun. Furthermore, the air circuit valve and the oil circuit valve can be connected as a whole. The drive mechanism 130 pushes the valve core 312 of the oil circuit valve 310 to simultaneously open the air circuit valve 320, allowing the two to operate in unison, ensuring that the oil passage is opened while the oil vapor can be recovered.

[0068] Figures 5A-5D Schematic diagram of a driving mechanism according to one embodiment of the present application. Figure 5A and Figure 5B They are three-dimensional views of the driving mechanism from different directions, showing its overall shape; Figure 5C It is a side view of the driving mechanism, showing its side shape; Figure 5D This is a cross-sectional view of the drive mechanism, showing its cross-sectional shape. Figure 6 1 is an exploded view of a driving mechanism according to one embodiment of the present application.

[0069] refer to Figure 1D-1F 、 Figures 5A-5D as well as Figure 6The drive mechanism 130 includes a fixed sleeve 510, a drive sleeve 520, and a drive shaft 530. The drive shaft 530 is adapted to be assembled within the drive sleeve 520. The end of the drive sleeve 520 that contacts the drive shaft 530 is adapted to be assembled within the fixed sleeve 510. Correspondingly, the other end of the drive shaft 530 is also adapted to be assembled within the fixed sleeve 510, forming a stacked assembly structure. In some embodiments, the fixed sleeve 510 is fixed within the drive mechanism cavity of the gun body 110, and the drive sleeve 520 and drive shaft 530 can each reciprocate along the axis of the fixed sleeve.

[0070] According to one embodiment of the present invention, the fixed sleeve 510 is generally cylindrical in shape, hollow in interior, and includes an opening 511 at its first end for accommodating the drive sleeve 520 so that it extends into the interior of the fixed sleeve 510. In some embodiments, the second end of the fixed sleeve 510 is tapered to facilitate its assembly into the drive mechanism cavity of the gun body 110 without affecting the air pressure passage of the gun body 110, thereby ensuring a straight air pressure passage and avoiding the formation of a complex air pressure passage that would increase the difficulty of casting the gun body 110.

[0071] 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 to 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, Figure 5C The direction in which the drive mechanism is set is the reference direction. Converter 161 can be coupled to drive shaft 530 through openings 512 and 513. Specifically, converter 161 can include a connector 162 and a driver 163. Connecter 162 can be a U-shaped connector, with one open end disposed on the gun body and the bottom end of the U-shape connected to trigger 160. Driver 163 can be a pin, rod, stick, nail, etc., which can be inserted through opening 103 on the gun body into openings 512 and 513 on the fixed sleeve 510, and then pass through the gun body 110 to connect to connector 162. When trigger 160 is pulled, connector 162 rotates in a circular motion relative to the fixed point on gun body 110, causing driver 163 to move linearly along opening 103, openings 512, and 513, thereby driving drive shaft 520 to move along the axis of fixed sleeve 510.

[0072] In some embodiments, the fixed sleeve 510 further includes a recess 514 for defining the position of the fixed sleeve. Figure 1D The relative position of the fixed sleeve and the gun body can be limited or fixed by the limiting member 501. For example, the limiting member 501 can be a limiting pin, a limiting nail, a limiting rod, a limiting block, a screw, etc.

[0073] In some embodiments, the fixed sleeve 510 may further include a strip-shaped opening 515, which is provided at the bottom of the fixed sleeve 510 and is used to accommodate the passage of the limiting rod 502. Figure 5D The fixed sleeve 510, the drive sleeve 520, and the drive shaft 530 can be limited by the limiting rod 502 to prevent axial rotation between the three and change the relative positions between the three. When the drive shaft 530 or the drive sleeve 520 moves in the fixed sleeve, the limiting rod 502 also moves accordingly in the strip-shaped opening 515. The limiting rod 502 or a portion thereof may include a thread, which can be threadedly connected to the drive shaft. In some embodiments, the limiting rod 502 and the drive shaft 530 can be fixedly connected in other ways. For example, clamping, bonding, interference fit, or transition fit, etc.

[0074] In some embodiments, the fixed sleeve 510 may further include an opening 516 , which is disposed above the fixed sleeve 510 and between the recess 514 and the first end of the fixed sleeve 510 , for accommodating a gear pin seat of the vacuum cap.

[0075] In some embodiments, the fixed sleeve 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 sleeve 510, and the first sealing ring 517 is used to seal the fixed sleeve 510 and the gun body 110, preventing 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 sleeve 510 and the drive sleeve 520, preventing oil from entering the interior of the fixed sleeve and then leaking out of the oil gun through the opening in the fixed sleeve. According to one embodiment of the present application, the fixed sleeve 510 may further include a limiting 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 rings and prevent the position of the sealing rings from changing during assembly, thereby affecting the sealing effect of the oil gun.

[0076] According to one embodiment of the present invention, the drive sleeve 520 is generally cylindrical in shape and hollow in its interior, adapted to accommodate the passage of the drive shaft 530, allowing the drive shaft 530 to extend into the interior of the drive sleeve. According to one embodiment of the present application, the drive sleeve 520 may include a groove 521 located at the first end of the drive sleeve. The groove 521 corresponds to the position of the openings 512 and 513 of the fixed sleeve 510 and is adapted to accommodate the drive member 163 of the conversion member 161. In some embodiments, the drive sleeve 520 may not include the groove 521, and the first end of the drive sleeve 520 may not extend beyond the openings 512 and 513 of the fixed sleeve 510.

[0077] According to one embodiment of the present application, the second end of the drive sleeve 520 includes a protrusion 522, which contacts the guide cone 317 (for example, contacts the protrusion 318 of the guide cone 317) and is used to push the guide cone 317 or the valve core 312. This helps increase the distance between the drive mechanism and the guide cone, making it easier for the drive mechanism to push the guide cone. In some embodiments, the protrusion 522 may also include one or more platforms 523, which are used to define the position of the drive sleeve, prevent it from rotating, and facilitate the assembly position of the oil gun parts. According to one embodiment of the present application, the protrusion 522 is integrally formed with the drive sleeve 520.

[0078] In some embodiments, the drive sleeve 520 may further include an opening 524, located above the drive sleeve 520 and near the center of the drive sleeve 520, for accommodating the shift pin of the vacuum cap shift pin holder. Accordingly, the corresponding position on the drive shaft also includes an opening 531, the size of which is the same as that of opening 524. When the shift pin of the vacuum cap shift pin holder falls into openings 524 and 531, the drive shaft and drive sleeve become integrated (i.e., the oil gun is "shifted"). At this point, the drive mechanism is in an operational state. When the driver 163 pushes the drive shaft 530 to move, the drive sleeve 520 moves with the drive shaft 530. When the shift pin of the vacuum cap shift pin holder leaves openings 524 and / or 531, the drive shaft and drive sleeve separate. At this point, the drive mechanism is in an inoperable state. When the driver 163 pushes the drive shaft 530 to move, the drive shaft 530 moves relative to the drive sleeve 520 and cannot push the drive sleeve 520 to move.

[0079] According to one embodiment of the present invention, the drive shaft 530 is generally cylindrical. The end near the drive sleeve 520 that contacts it includes a dry-test hole 532, which aligns with the groove 521 of the drive sleeve 520. This hole is used to lock the drive shaft 530 and drive sleeve 520 together from the outside of the gun body, facilitating a dry-test (i.e., a simulated refueling test) of the oil gun before use. Specifically, a positioning member (e.g., a pin, nail, stick, rod, etc.) is inserted through the opening 103 of the gun body 110 into the opening 512 of the fixed sleeve, passed through the groove 521 of the drive sleeve 520, passed through the dry-test hole 532, and then passed through the opening 513 of the fixed sleeve 510 to exit the gun body. At this point, the driver 163 propels the drive shaft 530 along the axis of the fixed sleeve 510. The drive shaft 530 drives the positioning member to move synchronously, which in turn pushes the groove 521 of the drive sleeve 520, thereby moving the drive sleeve 520. Thus, when the gear pin without the vacuum cap gear pin seat falls into the openings 531 and 524 of the drive shaft and the drive sleeve, the drive shaft 530 and the drive sleeve 520 can be locked, the drive mechanism is in a usable state, the valve assembly is opened, and the dry test of the oil gun is realized.

[0080] In some embodiments, the drive mechanism 130 may further include a spring 540 between the drive shaft 530 and the drive sleeve 520. This spring 540 can be used to reset the drive shaft and to cushion the movement between the drive sleeve and the drive shaft. For example, when the engaging pin of the vacuum cap engaging portion has not entered the openings 524 and 531, pulling the trigger converter 161 will move the drive shaft, but the drive sleeve will not move with the drive shaft; the drive shaft will only compress the spring 540. The valve assembly 120 will not open. When the trigger is released, the spring 540 will return the drive shaft to its original position.

[0081] The drive mechanism in this application is a separate drive mechanism that requires a special "gear engagement" locking mechanism to lock it into place, forming a single unit. Pulling the trigger allows the drive mechanism to advance the valve assembly. The separate drive mechanism uses a common limit rod to define the relative circumferential positions of its components, ensuring accurate positioning of the drive mechanism components and facilitating assembly.

[0082] Figures 7A-7D Schematic diagram of a vacuum cap according to one embodiment of the present application. Figure 7A and Figure 7B They are three-dimensional images of the vacuum cap from different directions, showing its overall shape; Figure 7C is a side view of the vacuum cap, showing its side shape; Figure 7D It is a cross-sectional view of the vacuum cap, showing its cross-sectional shape. Figure 8 This is an exploded view of a vacuum cap according to one embodiment of the present application. The vacuum cap is primarily used to pre-engage the drive mechanism (i.e., lock the drive mechanism) before refueling, ensuring that the drive mechanism is fully integrated and operational. When refueling is complete, the drive mechanism is unengaged (i.e., unlocked).

[0083] refer to Figure 1D-1F 、 Figures 7A-7D as well as Figure 8 The vacuum cap 140 includes a cap 710 and a base 720. The cap 710 is a hollow cylindrical shape and 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 foundation for the other parts of the vacuum cap 140.

[0084] In some embodiments, the outside or a portion of the outside 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 simultaneously 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, connection through a threaded key is only one embodiment in this field, and other existing embodiments in this field can be applied to the technical solution of the present application. For example: bonding, welding, transition fit, etc. In one embodiment, the top and / or bottom of the cap 710 also includes a hollow 715, which helps to reduce the weight of the cap and reduce the cost of the oil gun.

[0085] In some embodiments, the base 720 includes one or more stoppers 721 spaced apart around the circumference of the base 720 and adjacent to one side of the cap 710. These stoppers 721 are used to position the cap 710, maintaining a certain distance between the cap 710 and the base 720. This distance defines the air pressure passage 107 of the gun body 110. In some cases, the air pressure passage 107 can draw air between the cap 710 and the base 720. In other embodiments, the stoppers 721 can be located elsewhere on the base 720.

[0086] In some embodiments, the side of the cap 710 may include one or more through holes 711, which connect the inside and outside of the cap 710 and become part of the oil pressure channel 106 on the gun body 110, so as to facilitate the oil to enter the internal space of the vacuum cap through the oil pressure channel 106.

[0087] In some embodiments, the cap 710 may further include a plurality of sealing rings 712, which are disposed between the cap 710 and the gun body 110 and located on the upper and lower sides of the through hole 711 to prevent the oil from entering the vacuum cap cavity from the oil pressure channel 106 and leaking out of the oil gun, or further flowing into the drive mechanism cavity and leaking out of the oil gun. Figure 7C In some embodiments, the cap 710 may further include a plurality of limiting grooves 713 for accommodating the sealing ring 712 to limit the position of the sealing ring and prevent the sealing ring from moving during installation and affecting the sealing effect of the oil gun.

[0088] In some embodiments, the vacuum cap 140 may further include a piston 730, which is disposed inside the cap 710 and moves up and down inside the cap 710. Oil can enter between the cap 710 and the piston 730 through the through hole 711 on the cap from the oil pressure channel 106. When oil pressure exists, the piston 730 will be pushed downward by the oil; when the oil pressure is removed, the piston 730 will move upward with the oil in the cap. The oil portion in the vacuum cap is defined between the cap 710 and the piston 730. In some embodiments, the piston 730 further includes one or more sealing rings 731, which are disposed on the circumference of the piston and contact the side wall of the cap, and are used to seal between the piston and the cap to prevent oil from entering the bottom of the piston and leaking. The piston may also include a limiting groove 732, which is used to limit the position of the sealing ring to prevent the position of the sealing ring from changing when the piston moves.

[0089] According to one embodiment of the present application, the piston 730 includes one or more depressions 733 above it, which are in the shape of a ring. Correspondingly, the portion of the cap that contacts it includes one or more protrusions 716, which are similar in shape to the depression 733. The two can cooperate with each other to define a passage for the oil therebetween. One or more depressions 733 and protrusions 716 can increase the contact area with the oil and can buffer changes in oil pressure. When the oil pressure changes drastically, the flow rate of the oil will not change very drastically, thereby making the movement speed of the piston 730 change more slowly.

[0090] In some embodiments, the vacuum cap may further include a self-sealing spring 701 disposed between the piston 730 and the base 720 to restore the position of the piston 730. Specifically, when the oil pressure decreases, the self-sealing spring 701 pushes 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.

[0091] In some embodiments, the vacuum cap may further include a diaphragm 740, which is similar in shape and size to the base and is disposed between the base and the step of the gun body vacuum cap cavity, and can be used to isolate the air above and below the base. According to one embodiment of the present application, the material of the diaphragm 740 is a flexible or partially flexible material, and its state changes when subjected to a force. For example, it can be rubber, silicone, plastic, etc. The diaphragm 740 and the piston 730 are respectively located on both sides of the base 720, defining the gas part in the vacuum cap. The gas channel on the base 720 is connected to the gas part.

[0092] In some embodiments, the vacuum cap may further include a spring 703 disposed between the spring seat 702 and the diaphragm 740. According to one embodiment of the present application, the diaphragm 740 includes one or more gaskets 741 disposed on either side of the diaphragm to clamp the diaphragm 740. The upper gasket contacts one end of the spring 703 to withstand the spring's force, facilitating force balance on the diaphragm and preventing damage to the diaphragm from the spring.

[0093] In some embodiments, the vacuum cap may further include a gear pin seat 750, which is arranged below the diaphragm and moves up and down with the diaphragm. A gear pin 752 is provided in the gear pin seat 750, which can move linearly in the gear pin seat. In some embodiments, the gear pin seat further includes tracks 753 and 754. The gear pin 752 can move along the tracks 753 and 754 to ensure the position accuracy of the movement. As mentioned above, the gear pin seat 750 coincides with the opening 516 of the fixed sleeve 510. When the gear pin seat 750 falls into the opening 516 of the fixed sleeve, the gear pin can fall into the drive shaft opening 531 and the drive sleeve opening 524, forming the drive shaft and the drive sleeve into a whole.

[0094] In some embodiments, the vacuum cap may further include a connector 704, one end of which is connected to the shift pin holder 750 and the other end to the diaphragm. In some embodiments, the end of the connector 704 connected to the diaphragm may extend through the jumper spring into the spring seat, connecting to the spring seat, thereby strengthening the connection with the shift pin holder and guiding its movement.

[0095] The working process of the vacuum cap is roughly 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 jump gun spring; the jump gun spring will continue to push the diaphragm downward, so that the gear pin of the gear pin seat can fall into the drive mechanism, locking the drive mechanism; when the oil evacuates the vacuum cap, there is no oil pressure, the self-sealing spring will push the spring seat upward, thereby pushing the piston upward, and can lift the diaphragm, driving the gear pin seat to move upward, so that the gear pin is disengaged from the drive mechanism, and the state of the drive mechanism is changed to an unlocked state; for the gas part, when the gas between the piston and the diaphragm is extracted, the diaphragm moves upward, compressing the jump gun spring, lifting the diaphragm, and driving the gear pin seat to move upward, so that the gear pin is disengaged from the drive mechanism, and the state of the drive mechanism is changed to an unlocked state.

[0096] Figures 9A-9D Schematic diagram of a barrel assembly according to one embodiment of the present application. Figure 9A and Figure 9B They are three-dimensional views of the barrel assembly from different directions, showing its overall shape; Figure 9C It 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 The figure is an exploded view of a barrel assembly according to one embodiment of the present application.

[0097] refer to Figure 1D-1F 、 Figures 9A-9D as well as Figure 10 The gun barrel assembly 150 includes a venturi valve 910, a gun barrel 920, and an air pipe 930. The venturi valve 910 is mounted on one end of the gun barrel 920, the other end of which can be inserted into the vehicle's fuel tank. The air pipe 930 is mounted on the outside of the gun barrel 920 and is used to recover oil vapor. One end of the air pipe 920 is connected to the gas channel, while the other end can also extend into the vehicle's fuel tank and is slightly open to the outside for recovering oil vapor.

[0098] In some embodiments, the air tube 930 is fixed to the outside of the gun barrel 920 or the Venturi valve 910. For example, the air tube 930 is fixed to the valve body of the Venturi valve 910 via a threaded connection. In some embodiments, the air tube can also be fixed to the gun barrel 920 or the Venturi valve 910 using other connection methods, such as welding, clamping, or transition assembly.

[0099] 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 gun barrel. The valve core 912 acts on the valve seat 911 to block the passage of oil. In some embodiments, the portion of the valve seat 911 not in contact with the valve core 912 is hollowed out to increase the cross-sectional area of the oil passage in the Venturi valve, ensuring that the liquid passage in the oil gun is as consistent as possible, thereby reducing oil energy loss and increasing the flow rate of the oil gun.

[0100] In some embodiments, the valve seat 911 is a split valve seat, meaning it consists of multiple joined parts. For example, one part contacts the valve core, and another part does not, with the two parts connected by threads to form a single unit. This arrangement facilitates assembly of the Venturi valve, as well as maintenance and replacement of components.

[0101] According to one embodiment of the present application, the contact surface between the valve core 912 and the valve seat 911 is an inclined surface. When oil forces the valve core away from the valve seat, the oil passing through the valve core 912 generates a "Venturi effect," creating a vacuum. In some embodiments, the valve seat 911 includes one or more vacuum holes 913, which connect the contact point between the valve seat 911 and the valve core 912 to the outside of the valve seat. This is used to replenish air to compensate for the vacuum created by the "Venturi effect" of the Venturi valve and maintain air pressure balance.

[0102] In some embodiments, the venturi valve has two channels for replenishing external air: one is through the air pressure channel 107 from the vacuum cap chamber. The vacuum hole 913 corresponds to the position of the air pressure channel 107 on the gun body 110, and the air pressure channel 107 can be connected to the vacuum cap chamber. The other is through the vacuum channel 108. The vacuum channel 108 extends along the gun barrel 920, with one end connected to the vacuum hole 913 on the valve seat 911 and the other end connected to the outside along the gun barrel 920. In some embodiments, the vacuum channel 108 is provided on the gun barrel 920 and is integrally formed with the gun barrel 920.

[0103] In some embodiments, reference Figure 1E The oil gun 100 may further include a posture device 170, which is positioned below the barrel assembly and located in the vacuum channel 108 of the gun body 110. The posture device 170 can adjust to the different elevation angles of the oil gun, keeping the vacuum channel unobstructed or blocked. For example, the posture device 170 includes a steel ball 171 and a plug 172. The steel ball 171 can reciprocate in a portion of the vacuum channel (for example, on both sides of the connection between the gun body vacuum channel 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 in other parts of the gun body, preventing the steel ball from moving to other locations. The plug 172 is located at the end of the vacuum channel to seal the vacuum channel. When the steel ball 171 moves near the plug 172, the vacuum channel of the gun barrel is above the steel ball 171 and 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, blocking the vacuum channel. The posture device is positioned horizontally on 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.

[0104] In some embodiments, multiple sealing rings 914 are provided between the valve seat 911 and the gun body. These rings are positioned between the valve seat 911 and the gun body 110, on either side of the hollowed-out portion of the valve seat and on either side of the vacuum hole, to prevent oil from leaking out of the gun body or allowing the vacuum hole to be replenished with air from other locations. The valve seat 911 includes multiple limiting grooves 915, which accommodate the sealing rings 914 and limit their position to prevent them from shifting during installation.

[0105] Furthermore, the gun barrel 920 is a bent round tube, which may include a vacuum channel 921. The vacuum channel 921 has the same length as the gun barrel and is disposed at the bottom of the gun barrel (with a Figure 1EThe gun barrel assembly 150 is oriented in the direction of the gun body (the gun body is positioned in the reference direction), and one end is in communication with the vacuum passage 108 of the gun body 110. In some embodiments, the barrel assembly 150 includes a connector 940 that can be used to connect the gun barrel 920 and the air pipe 930. For example, the connector 940 is disposed at the bottom of the gun barrel and the air pipe, and passes through the air pipe and the vacuum passage of the gun barrel. In some embodiments, the connector 940 includes a through hole 941 that connects the vacuum passage 921 of the gun barrel to the vacuum passage 108 of the gun body 110. For example, the connector 940 can be a screw with a through hole.

[0106] According to one embodiment of the present application, on both sides of the connecting piece 940, multiple sealing rings 901 may be included between the gun barrel and the air pipe, and between the air pipe and the gun body, and the air pipe includes multiple limiting grooves 931, which will not be repeated here.

[0107] In some embodiments, one end of the air pipe 930 is connected to the Venturi valve 910, and the other end is shaped like a trumpet, which can be used to collect oil vapor from the fuel gun and recycle the oil vapor through the gas passage of the gun body to the fuel dispenser. For example, the air pipe includes an opening 932, which is located below the air pipe 930 and corresponds to the position of the gas passage of the gun body 110. In some embodiments, the air pipe 932 is a separate air pipe, that is, the air pipe is composed of multiple parts. For example, one part collects the gas from the fuel tank, and another part connects to the gun body. The two parts can be connected into one piece via multiple screws, which facilitates assembly of the gun barrel assembly and facilitates replacement and maintenance.

[0108] Furthermore, the barrel assembly 150 may also include an air hood 950, which fits over the exterior of the air pipe and can be attached to the fuel tank's filler port to prevent oil vapor from escaping into the air and oil from splashing outside the tank. According to one embodiment of the present application, the air hood 950 is provided with multiple corrugations to help cushion the force applied when the fuel gun is inserted into the fuel tank. According to one embodiment of the present application, the air hood 950 is made of a flexible or partially flexible material, such as rubber, silicone, or plastic.

[0109] The above details the various components of the fuel gun of this application. As those skilled in the art will appreciate, there are only two existing refueling methods: fixed-rate refueling and full tank refueling. The following describes the workings of the aforementioned components of the fuel gun using these two methods.

[0110] In one scenario, during fixed-quota refueling, after the refueling amount is entered into the fuel dispenser, the dispenser delivers oil through a hose to the valve assembly of the fuel dispenser nozzle. Because the valve core of the oil circuit valve is not open, the oil does not flow into the fluid channel of the nozzle body. Instead, it flows through the oil pressure channel of the nozzle body into the vacuum cap, pushing the piston toward the drive mechanism and engaging the shift pin in the drive mechanism. At this point, if the trigger is pulled, the drive shaft sleeve moves along with the drive shaft toward the valve assembly, opening the valve core of the oil circuit valve. Furthermore, the oil flows through the nozzle body's fluid channel to the Venturi valve, pushing the valve core of the Venturi valve. After flowing through the Venturi valve, it enters the nozzle barrel and flows into the fuel tank. When the predetermined amount is reached or nearly reached, the fuel dispenser stops discharging oil or reduces the flow rate, reducing the oil pressure in the hose. The restoring force of the self-sealing spring in the vacuum cap is greater than the oil pressure, pushing the piston away from the drive mechanism, causing the shift pin to disengage from the drive mechanism. The return spring pushes the oil valve spool back to its closed position. Oil cannot flow through the valve, and refueling stops. This ensures refueling at a fixed rate.

[0111] In some embodiments, a protrusion or depression is added between the cap body and the piston of the vacuum cap to increase the contact area with the oil. When the oil pressure decreases, the friction between the oil prevents the shift pin from quickly disengaging from the drive mechanism due to excessive changes in oil pressure. As a result, the valve core of the oil circuit valve is pushed back by the reset spring, causing the oil gun to "jump" (that is, the oil gun stops discharging oil if the predetermined amount is not added). In a further embodiment, the oil in the oil circuit valve enters the oil pressure through the gap between the oil circuit valve and the gun body. The gap between the two will also increase the friction with the oil due to the small distance between the two, preventing "jumping" caused by excessive pressure changes.

[0112] Another scenario involves stopping refueling when the tank is full. When the fuel dispenser delivers oil to the nozzle's valve assembly through a hose, the oil circuit valve's spool is not open, preventing the oil from flowing into the nozzle's fluid passages. Instead, it flows through the nozzle's oil pressure passages into the vacuum cap, pushing the piston toward the drive mechanism. This engages the shift pin in the drive mechanism. Pulling the trigger causes the drive shaft sleeve to move along with the drive shaft toward the valve assembly, opening the oil circuit valve's spool. The oil then flows through the nozzle's fluid passages to the Venturi valve, pushing the spool, flowing through the valve, into the barrel, and into the fuel tank. As the oil flows through the Venturi valve, it creates a "Venturi effect," replenishing air in the tank through the nozzle's vacuum passages and the barrel's vacuum passages. When the oil overflows the barrel's vacuum passage opening, it draws the oil into the Venturi valve. Therefore, the Venturi valve cannot replenish air from the vacuum channel. Instead, the air between the diaphragm and the cap body of the vacuum cap is sucked out through the gun body's air pressure channel. As the Venturi valve draws air between the cap body and the diaphragm, the diaphragm is pulled away from the drive mechanism, which in turn synchronizes the shift pin and disconnects it from the drive mechanism. The return spring pushes the oil valve spool back to the closed position, preventing oil from passing through the valve. This allows refueling to be stopped after the tank is full.

[0113] In some embodiments, the fueling gun of the present application is designed to have a channel through which the oil flows that is as simple and straight as possible. The oil enters the gun body from the oil inlet and flows out of the gun barrel, and the flow direction changes to 135° to 150°. Therefore, the oil loses less energy during the flow process and is not prone to generating eddies, which can effectively increase the flow rate of the fuel gun.

[0114] The above embodiments are only used to illustrate the present invention, and are not intended to limit the present invention. Ordinary technicians in the relevant technical field can make various changes and modifications without departing from the scope of the present invention. Therefore, all equivalent technical solutions should also fall within the scope of the present invention.

Claims

1. A vacuum cap for a refueling gun, comprising: a cap including a cavity; a base located at the cavity opening of the cap; a piston disposed within the cavity of the cap, wherein the cap and the piston define an oil portion of the vacuum cap; a diaphragm disposed on a side of the base away from the cap, wherein a gas portion of the vacuum cap is defined between the piston and the diaphragm; and The gear engaging pin seat moves together with the diaphragm; Among them, the top of the piston includes multiple depressions, and correspondingly, the part of the cap that contacts it includes multiple protrusions. The two cooperate with each other. The multiple depressions or protrusions between the cap and the piston define the channels for the oil to enter and withdraw from the oil part of the vacuum cap, as well as define the speed at which the oil enters and withdraws from the oil part of the vacuum cap.

2. The vacuum cap according to claim 1, wherein the passage for oil to enter and withdraw from the oil portion of the vacuum cap is multi-layered annular.

3. The vacuum cap according to claim 1, wherein as the oil pressure of the oil part changes, the piston drives the diaphragm to move up and down, causing the gear pin in the gear pin seat to move up and down; wherein as the air pressure of the gas part changes, the diaphragm moves up and down, causing the gear pin in the gear pin seat to move up and down.

4. The vacuum cap according to claim 3, further comprising: A spring seat and a self-sealing spring between the spring seat and the base, wherein the spring seat is arranged on the gas part of the vacuum cap.

5. The vacuum cap according to claim 4, further comprising: Jump gun spring between the spring seat and the diaphragm.

6. The vacuum cap according to claim 1, wherein: The base includes a plurality of limiting blocks which are arranged at the edge of the base and configured to define a distance between the base and the cap; wherein the gaps between the limiting blocks define channels for entering and exiting the gas portion.

7. The vacuum cap according to claim 1 , further comprising: The connecting piece is arranged between the diaphragm and the gear engaging pin seat.

8. The vacuum cap of claim 1, wherein the gear pin holder comprises a gear pin configured to slide along the track.

9. A refueling gun comprising: a gun body including a liquid passage for oil to pass through; a valve assembly disposed within the valve assembly cavity of the gun body and configured to allow or prevent oil from passing through the liquid passage; a drive mechanism disposed within the drive mechanism cavity of the gun body and configured to control the opening or closing of the valve assembly; as well as The vacuum cap according to any one of claims 1 to 8 is arranged in the vacuum cap cavity of the gun body and is configured to lock the drive mechanism so that it is in an available state.

10. The fuel gun according to claim 9, wherein: The liquid passage includes a branch from the valve assembly chamber to the vacuum cap chamber such as the vacuum cap oil portion as described in any one of claims 1-8.

11. The fuel gun according to claim 10, wherein: The valve assembly includes an oil circuit valve, one side of which includes a groove connected to the vacuum cap chamber, and oil enters the groove through a gap or passage in the oil circuit valve chamber, wherein the gap or passage in the oil circuit valve chamber is designed to control the flow rate of the oil.

12. The fuel gun according to claim 9, further comprising a barrel assembly, the barrel assembly comprising a venturi valve, wherein a gas pressure channel is provided between the venturi valve and the gas portion of the vacuum cap according to any one of claims 1-8.

13. The fuel gun according to claim 12, further comprising: A vacuum channel connects the venturi valve with the outside of the fueling gun, wherein the vacuum channel extends along the barrel of the barrel assembly.

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