CN116354305A - Oil gun with oil gas recovery function - Google Patents

Abstract

The invention relates to a fuel gun with an oil gas recovery function, which comprises: the gun body comprises a liquid channel for oil to pass through and a gas channel for recovering oil and gas; a valve assembly disposed in the valve assembly cavity of the gun body configured to allow or prevent oil to pass through the liquid passage and oil gas to pass through the gas passage; a driving mechanism disposed in the driving mechanism cavity of the gun body and configured to control the opening or closing of the valve assembly; and a vacuum cap disposed in the vacuum cap cavity of the gun body, configured to lock the driving mechanism to be in a usable state; according to the oil gun, the isolation diaphragm is arranged in the vacuum cap, so that oil can be effectively prevented from leaking into the gun body, oil can be prevented from dripping from the oil gun, and the requirements of environmental protection and safety of a gas station are met.

Description

Oil gun with oil gas recovery function

Technical Field

The invention relates to the field of oiling equipment, in particular to an oiling gun with an oil gas recovery function.

Background

With the development of science and technology and the improvement of living standard, automobiles increasingly enter thousands of families. The increasing number of vehicles has led to a growing expansion of the construction of gas stations. In daily life, the gas station includes: a fuel tank disposed underground and a plurality of fueling devices coupled to the fuel tank. Each fueling device fueling the vehicle with oil through a fueling gun thereon.

During a long period of time, the oil vapors generated during fueling may be emitted into the air in or near the fueling station. However, most of gasoline, diesel oil and other oil products of the gas station are volatile and have certain toxicity, and the ignition point is low, so that the gasoline, diesel oil and other oil products are easy to ignite, and potential safety hazards exist. Along with the increasing environmental protection requirements, the requirements on the problems of environmental protection, safety and the like of the gas station are also higher and higher. In order to reduce the oil vapor in and around the gas station as much as possible, the oil vapor recovery technology is popularized, and the oil gun with the oil vapor recovery function is used in a large amount. However, the existing oil gun with the oil gas recovery function has short development time, unreasonable structure and immature technology, and the existing oil gun has the phenomenon of dripping oil. Therefore, new oil and gas recovery nozzle designs are becoming an urgent need.

Disclosure of Invention

Aiming at the technical problems in the prior art, the invention provides a fuel gun with an oil gas recovery function, which comprises the following components: the gun body comprises a liquid channel for oil to pass through and a gas channel for recovering oil and gas; a valve assembly disposed in the valve assembly cavity of the gun body configured to allow or prevent oil to pass through the liquid passage and oil gas to pass through the gas passage; a driving mechanism disposed in the driving mechanism cavity of the gun body and configured to control the opening or closing of the valve assembly; and a vacuum cap disposed in the vacuum cap cavity of the gun body, configured to lock the driving mechanism to be in a usable state; wherein, a pneumatic channel is arranged between the vacuum cap cavity and the Venturi valve, and an oil pressure channel is arranged between the vacuum cap and the valve component; the vacuum cap comprises a cavity for accommodating at least part of the locking piece, the air pressure channel and the oil pressure channel are respectively communicated with the cavity, the locking piece can move in the cavity to lock the driving mechanism under the oil pressure action of the oil pressure channel, and the vacuum cap further comprises an isolation diaphragm which is arranged in the cavity and is positioned between the oil pressure channel and the air pressure channel and used for separating the oil pressure channel and the air pressure channel.

The fuel dispenser as described above wherein the isolation diaphragm is corrugated in shape and includes one or more depressions and one or more protrusions, the depressions being staggered with the protrusions and the height of the protrusions being greater further down the center of the isolation diaphragm.

The fuel dispenser as described above further includes a securing member for securing the isolation diaphragm in the cavity.

The fuel dispenser as described above wherein the securing member includes external threads that threadably engage at least a portion of the cavity.

The fuel dispenser as described above, further comprising: the positioning ring is arranged between the fixing piece and the isolation diaphragm; the positioning ring comprises one or more positioning pins which are arranged in the cavity wall and limit the linear motion of the positioning ring to push the isolation diaphragm to be compressed.

The oil gun is characterized in that the contact surface of the positioning ring and the isolation diaphragm is polished, and the roughness is less than Ra0.1.

The fuel dispenser as described above, further comprising: and the supporting piece is arranged on the locking piece and is contacted with the isolating diaphragm, so that the isolating diaphragm can be supported.

The fuel dispenser as described above wherein the support member is the same shape as the isolation diaphragm.

The fuel dispenser as described above wherein the support member is located in the retaining ring and is in contact with the inner wall of the retaining ring and is reciprocally movable by the inner wall of the retaining ring.

The fuel dispenser as described above wherein the vacuum cap is machined and the oil pressure channel or a portion thereof is a straight bore.

According to the oil gun, the isolation diaphragm is arranged in the vacuum cap, so that oil can be effectively prevented from leaking into the gun body, oil can be prevented from dripping from the oil gun, and the requirements of environmental protection and safety of a gas station are met.

Drawings

Preferred embodiments of the present invention will be described in further detail below with reference to the attached drawing figures, wherein:

FIG. 1 is a schematic illustration of a fuel dispenser according to one embodiment of the present application;

FIG. 2 is a cross-sectional view of a fuel dispenser configuration according to one embodiment of the present application;

FIG. 3 is a schematic view of a vacuum cap according to one embodiment of the present application;

FIG. 4 is an exploded view of a vacuum cap according to one embodiment of the present application; and

fig. 5A and 5B are cross-sectional views of a vacuum cap according to one embodiment of the present application.

Detailed Description

For the purpose of making the objects, technical solutions and advantages of the embodiments of the present invention more apparent, the technical solutions of 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, and it is apparent that the described embodiments are some embodiments of the present invention, but not all embodiments of the present invention. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.

In the following detailed description, reference is made to the accompanying drawings, which form a part hereof, and in which is shown by way of illustration specific embodiments in which the application may be practiced. In the drawings, like reference numerals describe substantially similar components throughout the different views. Various specific embodiments of the present application are described in sufficient detail below to enable those skilled in the art to practice the teachings of the present application. It is to be understood that other embodiments may be utilized or structural, logical, or electrical changes may be made to the embodiments of the present application.

The technical scheme of the application is further described through specific embodiments. It should be understood by those skilled in the art that the following descriptions are only for convenience in understanding the technical solutions of the present application and should not be used to limit the scope of protection of the present application.

Fig. 1 is a schematic structural view of a fuel dispenser according to one embodiment of the present application. FIG. 2 is a cross-sectional view of a fuel dispenser configuration according to one embodiment of the present application. As shown, the fuel dispenser 100 includes a gun body 110 that includes an oil inlet 101 and an oil outlet 102. The oil inlet 101 can be connected with a rubber tube through an inlet thread, so that an oil gun can be connected to the oiling machine. The oil of the oiling machine can enter the gun body from the oil inlet and then flows out of the gun body from the oil outlet. In some embodiments, the gun body 110 may be cast, so that the positions of the gun body components and/or channels may be reasonably arranged, so that the gun body size may be reduced, the manufacturing cost may be reduced, the application range of the gun body may be increased, and the processing during the later assembly may be facilitated.

As shown, the fuel dispenser 100 further includes a valve assembly 120 disposed from the fuel inlet to the fuel outlet of the gun body 110, a drive mechanism 130, a vacuum cap 140, and a barrel assembly 150. The valve assembly 120 is used for allowing or preventing oil from passing through the gun body 110 and allowing or blocking oil vapor from passing through the gun body 110 after being recovered; the driving mechanism 130 is connected with the valve assembly 120, and can control the on-off of the valve assembly 120, so that oil and/or oil steam can be controlled to pass through; the vacuum cap 140 may be used to lock the drive mechanism 130, and when the drive mechanism 130 is in the locked state, the drive mechanism 130 may be integral and in the usable state; when the drive mechanism 130 is in the unlocked state, the drive mechanism 130 is in an unavailable state, and the opening and closing of the valve assembly 120 cannot be controlled; the barrel assembly 150 is disposed at the front of the gun body 110 and is insertable into a fuel tank of a vehicle to introduce fuel exiting the fuel outlet of the gun body into the vehicle fuel tank.

In some embodiments, gun body 110 may include a plurality of chambers for receiving the various components of the fuel dispenser described above, including, but not limited to: a valve assembly cavity for receiving the valve assembly 120, a drive mechanism cavity for receiving the drive mechanism 130, a vacuum cap cavity for receiving the vacuum cap 140, and a barrel assembly cavity for receiving at least a portion of the barrel assembly 150. In some embodiments, the valve assembly cavity is aligned substantially parallel to the drive mechanism cavity, having substantially the same axis, to ensure that the drive mechanism can control the valve assembly so that the valve assembly can be opened or closed. Further, the barrel assembly cavity and the valve assembly cavity and/or the drive mechanism cavity do not have substantially the same axis, but are angled. So that the oil gun cannot become too long to affect the use. In some embodiments, a venturi valve may be located in the barrel assembly cavity, the venturi valve being closer to the barrel assembly than the drive mechanism, the venturi valve not being about the same axis as the drive mechanism.

In some embodiments, the barrel assembly chamber axis may be at an angle of 150-170 degrees to the valve assembly chamber and/or the drive mechanism chamber axis. According to one embodiment of the present application, the angle of the barrel assembly chamber axis to the valve assembly chamber and/or the drive mechanism chamber axis may be 155 degrees. In some embodiments, the included angle between the axis of the barrel assembly cavity and the axis of the valve assembly cavity and/or the axis of the driving mechanism cavity is located at the position of the central line of the vacuum cap cavity or the position of the central line of the oil gun to the right, that is, the included angle between the axes of the barrel assembly cavity and the axis of the valve assembly cavity is closer to the valve assembly cavity, so that the flow direction of oil can be changed after passing through the valve assembly cavity, the driving assembly cavity is prevented from affecting the oil flow, the overflow area of the oil can be increased, and the flow rate of the oil gun can be increased. In some embodiments, the gun of the present application may achieve a flow rate of 49-50L at a pressure of 1 KG.

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

In some embodiments, the gun body 110 may also include an oil pressure passage 106 between the valve assembly cavity and the vacuum cap cavity and an air pressure passage 107 between the vacuum cap cavity and the barrel assembly cavity. Oil can enter the vacuum cap 140 through the oil pressure channel 106, and oil pressure provided by the oil can push the vacuum cap 140 to lock the driving mechanism 130, so that the driving mechanism is in a usable state. One end of the air pressure channel 107 is connected to the vacuum cap cavity and the other end is connected to a venturi valve provided on the barrel assembly. When the venturi valve draws air in the vacuum cap 140 through the air pressure channel 107, the vacuum cap can be separated from the driving mechanism 130, so that the driving mechanism enters a non-usable state, the driving mechanism can not drive the valve assembly, the valve assembly is automatically turned off, and the automatic gun jump of the oil gun for filling is completed.

In some embodiments, valve assembly 120 is generally cylindrical in shape, including an oil circuit valve 121 and a gas circuit valve 122; the oil way valve 121 is disposed on the liquid channel 104 in the gun body 110, and can be used for controlling the oil to pass through the gun body 110; the air valve 122 is disposed on the air channel 105 of the gun body 110, and can be used for controlling oil vapor recovery. Of course, other shapes for the valve assembly 120 are possible, as will be appreciated by those skilled in the art. For example: cone-shaped, yurt-shaped or the like, or one or both of the oil way valve and the gas way valve are cone-shaped or yurt-shaped.

According to one embodiment of the present application, the oil path valve 121 may be integrally connected with the air path valve 122. In some embodiments, both may be integrally formed as a valve assembly 120 that controls both the liquid and gas passages. Thus, the opening and closing of the oil passage valve and the air passage valve can be controlled simultaneously. In some embodiments, the gas channel is deflected in the direction of the valve assembly 120 while the direction of the liquid channel remains substantially unchanged. In some embodiments, further, in the valve assembly 120, the gas channel is located inside the liquid channel, so that the influence on the oil flow rate is lower, and the liquid channel occupies a larger sectional area more easily, which is beneficial to improving the oil flow rate.

In some embodiments, the oil valve 121 includes an oil valve seat 1211 and an oil spool 1212; the oil spool 1212 may be generally flat and may be coupled to the drive mechanism 130 at one end. When the oil circuit valve core is propped against the oil circuit valve seat, oil is forbidden to pass through the oil gun. When the drive mechanism 130 pushes the oil spool off the oil valve seat, oil is allowed to pass. According to one embodiment of the present application, the oil circuit valve further includes a return spring 1213, which may be used to return the oil circuit valve element, i.e., push the oil circuit valve element against the oil circuit valve seat.

In some embodiments, the air circuit valve 122 includes an air circuit valve seat 1221 and an air circuit valve stem 1222; the air circuit valve seat 1221 is annular, and includes an outer ring and an inner ring, wherein the outer ring can be used for oil passing, and the inner ring can be used for oil steam passing. A portion of the second end of the air passage valve stem 1222, having a reduced diameter, is disposed in the air passage valve seat for controlling the passage of oil vapor.

In some embodiments, the first end of the air passage valve stem 1222 extends in communication with the air passage valve spool 1212, facilitating the simultaneous opening of the air passage valve 121 and the air passage valve 122 by the drive mechanism 130. In some embodiments, the air passage valve rod 1222 and the air passage valve core 1212 may be fixedly connected, for example, the air passage valve core 1212 is directly mounted on the first end of the air passage valve rod 1222, and the first end of the air passage valve rod 1222 is in contact with the driving mechanism 130, so that the air passage valve and the air passage valve can be synchronously opened by pushing the valve rod through the driving mechanism, when the driving mechanism cannot push the valve rod, the air passage valve rod can be synchronously pushed by pushing the air passage valve core through the reset spring, so that the air passage valve and the air passage valve can be synchronously closed, which is beneficial to the assembly of the valve assembly, the valve assembly has simple structure, is beneficial to control, and has low manufacturing cost.

In some embodiments, the valve assembly 120 may further include a retaining ring 123, which may be disposed on a side of the gas circuit valve that is remote from the gas circuit valve, and may be used to define the position of the gas circuit valve and the gas circuit valve. When the gun body 110 is installed, the oil way valve 121 and the air way valve 122 can be pushed and installed into the valve assembly cavity of the gun body 110 by screwing the positioning ring 123, and the positioning ring can further fix the positions of the oil way valve 121 and the air way valve 122 and prevent the positions from moving towards the oil inlet of the gun body 110. In one embodiment, the retaining ring 123 may include threads that may engage threads of the gun body 110 to facilitate installation and positioning of the valve assembly 120.

In these embodiments of the present invention, the valve assembly 120 is generally cylindrical and the air passage valve and the oil passage valve are integrally connected by an air passage valve stem. The driving mechanism 130 pushes the air path valve rod to simultaneously open the oil path valve 121 and the air path valve 122, and pushes the oil path valve core by using the reset spring to drive the valve rod to synchronously close the oil path valve 121 and the air path valve 122, so that the oil path valve 121 and the air path valve 122 can uniformly act, the recovery of oil steam can be performed while the oil path is opened, and the recovery of the oil steam can be stopped while the oil path is closed.

In some embodiments, the fuel dispenser 100 further includes a trigger 160 located outside of the gun body 110, coupled to the drive mechanism 130 via a switch 161, which may be used to control the drive mechanism. In some embodiments, the switch 161 is also located on the outside of the gun body, and may be connected at one end to the trigger 160. One or both sides of the gun body 110 include an opening 103, and the other end of the conversion member 161 may be connected to the driving mechanism 130 through the opening 103. In the locked state, when the trigger 160 is pulled, the driving mechanism 130 may be pushed via the switching member 161, thereby controlling the valve assembly 120.

In some embodiments, the fuel dispenser may also include a protective bow 164, which may be disposed on the outside of the trigger 160 and removably coupled to the gun body 110, may be used to protect the hands during fueling. In some embodiments, the guard 164 includes one or more pins 165 thereon for engaging the trigger 160 to facilitate operator securement of the trigger 160 during fueling. Correspondingly, the trigger 160 also includes a snap-in structure disposed on the tail of the trigger 160 that can be pushed to be inserted into the pins of the bow guard 164 to provide different oil flow rates.

The utility model provides a nozzle passes through the special structural design of rifle body, can make nozzle compact structure, and processing assembly is easy, can reduce manufacturing cost to can also improve the velocity of flow of nozzle. However, the current oil gun has the phenomenon of oil dripping, which is caused by leakage from the vacuum cap to the gun body, so that the oil is dripped from the gun body.

It is known that in order to realize the function of automatic closing the gun when the gun is full of oil, a set of vacuum sensing device (namely, a vacuum cap) is designed in the gun, and the gun closing action is triggered by detecting whether the vacuum degree and the oil filling pressure generated in the oil filling process reach the design targets. However, in the practical use process, the sealing requirement of the vacuum cap on the piston needs to ensure that the effective sealing is kept in the whole range of the normal working pressure (for example, 0.2-0.3 MPa) of the oil gun and the pressure (near zero) of the gun in the gun closing state, and meanwhile, the reciprocating flexible movement of the piston needs to be considered. At present, a vacuum cap structure is designed in a mode of a piston and a piston sealing ring, however, the structure has the problem of oil seepage to different degrees, and particularly, part of oil seeps out through the sealing ring under the tiny pressure generated by the residual gasoline in the rubber tube after the oil filling is finished. In a gas station site, it is often found that when the gun is in a gun-off state, after the gun is removed for filling, the downward muzzle of the gun drops down along the barrel assembly onto the bottom surface of the gas station or the housing of the vehicle. This phenomenon is detrimental to the safety and environmental protection of the oil station site.

From this, this application provides a novel vacuum cap, can effectually prevent the problem of fluid seepage under tiny pressure to can prevent to refuel again and take off oil gun drip fluid, can satisfy the requirement of environmental protection and safety scheduling problem

Fig. 3 is a schematic view of a vacuum cap according to one embodiment of the present application. Fig. 4 is an exploded view of a vacuum cap according to one embodiment of the present application. Fig. 5A and 5B are cross-sectional views of a vacuum cap according to one embodiment of the present application. Fig. 5A and 5B show different operating states of the vacuum cap, respectively.

As shown, the vacuum cap 140 includes a cap cover 310 and a base 320. The cap 310 is generally hollow and cylindrical, and is disposed on the base 320 to form an internal cavity of the vacuum cap. The base 320 is secured within the vacuum cap cavity and provides a connection basis for other portions of the vacuum cap 140.

In some embodiments, the outside or a portion of the outside of the cap 310 includes threads 311 that can connect the cap 310 into the vacuum cap cavity of the gun body 110. Correspondingly, an internal thread which can be meshed with the vacuum cap cavity of the gun body is arranged in the vacuum cap cavity of the gun body. The cap 310 can simultaneously press the base 320 below the cap 310, and can press the base 320 into the vacuum cap cavity, so that the base and the vacuum cap cavity are fixed. Of course, as those skilled in the art will appreciate, the threaded connection is only one embodiment in the art, and other embodiments already in the art can be applied to the technical solutions of the present application. For example: bonding, welding, transition fitting, etc.

In some embodiments, the base 320 includes one or more notches 321 spaced around the circumference of the base 320 and adjacent to one side of the cap 310, which may cooperate with the cap 310 to form an opening such that a space exists between the cap and the base, the space defining the air pressure channel 107 of the gun body 110. In some cases, the air pressure channel 107 may draw air between the cap 310 and the base 320. In other embodiments, the recess may be provided at other locations on the base 320.

In some embodiments, the sides of the cap 310 may include one or more through holes 312 that communicate the interior and exterior of the cap 310 and may be part of the oil pressure channel 106 on the gun body 110 to facilitate the passage of oil through the oil pressure channel 106 into the interior cavity of the vacuum cap. In some embodiments, the through holes 312 may be straight holes to facilitate machining of the vacuum cap and to control the size of the through holes 312, as well as to facilitate entry of oil from the through holes into the vacuum cap.

In some embodiments, the cap 310 may further include a plurality of sealing rings 313, which may be disposed between the cap 310 and the gun body 110 and located at upper and lower sides of the through hole 312, to prevent oil from entering the vacuum cap cavity from the oil pressure channel 106, thereby leaking out of the oil gun or further leaking out of the oil gun into the driving mechanism cavity. In some embodiments, the cap 310 may further include a plurality of limiting grooves 314 for accommodating the sealing ring 313, limiting the sealing ring, preventing the sealing ring from moving during the installation process, and affecting the sealing effect of the oil gun.

In some embodiments, the vacuum cap 140 may further include a locking member 330 disposed in the interior cavity of the vacuum cap and movable up and down in the interior cavity of the vacuum cap, thereby locking the drive mechanism or contacting the locking of the drive mechanism. In some embodiments, the lock 330 may lock the drive mechanism using oil pressure. When oil pressure exists, the locking piece 330 is pushed by the oil to move downwards; when the oil pressure is removed, the lock 330 will move upward with the oil in the cap.

In some embodiments, the vacuum cap 140 may further include an isolation diaphragm 340 disposed in the inner cavity of the vacuum cap and above the locking member 330, which may serve to isolate the oil pressure channel from the locking member or the oil pressure channel from the air pressure channel, so that oil of the oil pressure channel may be prevented from leaking into the air pressure channel from the locking member under a minute pressure, thereby leaking to the outside of the gun body. In some embodiments, the isolation diaphragm 340 may be coupled to at least a portion of the locking member such that when oil enters the vacuum cap through the oil pressure channel, the oil pushes the diaphragm, which may simultaneously push the locking member into motion, locking the drive mechanism. The cap 310 and isolation diaphragm 340 define therebetween a portion of the oil in the vacuum cap. In some embodiments, a groove 301 is included in the internal cavity of the vacuum cap or cap, which may be used to receive the edge of the isolation diaphragm, preventing the isolation diaphragm from loosening. According to one embodiment of the present application, the material of the isolation diaphragm 340 is a flexible or partially flexible material that changes state when subjected to a force. For example: may be rubber, silica gel, plastic, etc.

In some embodiments, the isolation diaphragm 340 is corrugated in shape, including one or more depressions 341 and one or more protrusions 342. Wherein, protruding and sunken crisscross setting can be for isolation diaphragm prestore motion length for isolation diaphragm is under the promotion of fluid, and gradual release length can avoid isolation diaphragm to promote excessive deformation or tensile the cause isolation diaphragm damage because of fluid, but also can prevent that isolation diaphragm from contacting petrol of different compositions from leading to expansion or fold deformation of different circumstances, can hold isolation module's deformation in the direction of fluctuation, thereby can increase the application scope of oil gun.

In some embodiments, the vacuum cap may further include a support 350 that may be disposed between the isolation diaphragm 340 and the lock 330 and that is used to support the isolation diaphragm, preventing the isolation diaphragm from hanging in the air, avoiding fatigue damage to the isolation diaphragm, affecting the use of the oil gun. In some embodiments, the shape of the support 350 is the same as the shape of the isolation diaphragm, so that the isolation diaphragm can be fully supported, the isolation diaphragm is prevented from being pressed in a single-side suspension manner, and fatigue damage of the isolation diaphragm is avoided. In some embodiments, the support 350 may be fixedly connected to the locking member 330, or the support 350 may be part of the locking member 330.

In some embodiments, the vacuum cap may further include a securing member 360 disposed within the interior cavity of the vacuum cap that may be used to secure and compress the isolation diaphragm within the interior cavity of the vacuum cap. In some embodiments, the securing member 360 may be a locking ring that is a hollow circular ring and the outer wall or a portion thereof includes external threads that may compress the isolation diaphragm within the internal cavity of the vacuum cap. Correspondingly, an internal thread which can be engaged with the internal cavity of the vacuum cap is arranged in the internal cavity of the vacuum cap. The securing member 360 may be precisely installed in the cap by dimensional control and may be held against the base to prevent the securing member from loosening, thereby allowing the isolation diaphragm to disengage. The double-thread anti-loosening structure can be formed by the mutual stress of the threaded connection of the vacuum cap and the vacuum cap cavity and the threaded connection of the fixing piece and the cap, thereby being beneficial to the fixation of the isolation diaphragm and the arrangement of the vacuum cap. In some embodiments, the inner wall of the locking ring or a portion thereof may include a plurality of quincuncial aperture structures to facilitate the screwing of the fastener by a standard wrench.

In some embodiments, the vacuum cap may further include a retaining ring 370, which may be disposed between the mount 360 and the isolation diaphragm 340 and may protect the isolation diaphragm from damage by the mount when the isolation diaphragm is secured in compression. In some embodiments, the positioning ring 370 may include one or more positioning pins 371 disposed in the cavity wall inside the vacuum cap, and correspondingly, the inner wall of the cap may include one or more grooves therein for accommodating the positioning pins to move in the grooves, so as to limit the positioning ring from moving linearly under the pushing of the fixing element to press the isolation diaphragm, and prevent the positioning ring from rotating to wear the isolation diaphragm.

In some embodiments, the retaining ring may be a metal machined piece whose interface with the isolation diaphragm requires a polishing process and a roughness below Ra0.1 to prevent the retaining ring from yielding to the isolation diaphragm. In some embodiments, the dimensions of the retaining ring may also need to be precisely controlled so that the retaining ring compresses the isolation diaphragm against the step of the groove 301, preventing excessive compression of the diaphragm, resulting in diaphragm crush. In some embodiments, the inner wall of the retaining ring may also contact the support member, thereby limiting movement of the support member, preventing the locking member from shifting during up and down movement, thereby affecting control of the drive mechanism.

In some embodiments, the vacuum cap may further include a self-sealing spring 302 disposed between the locking member 330 and the base 320 for restoring the position of the locking member 330. Specifically, when the pressure of the oil is reduced, the self-sealing spring 302 pushes the locking member 330 back to the initial position.

In some embodiments, the vacuum cap may further include a vacuum membrane 380, similar in shape and size to the base, disposed between the base and the step of the gun body vacuum cap cavity, which may serve to isolate air above and below the base. According to one embodiment of the present application, the material of the vacuum diaphragm 380 is a flexible or partially flexible material that changes state when subjected to a force. For example: may be rubber, silica gel, plastic, etc. The vacuum membrane 380 and the isolation membrane 340 are located on either side of the base 320, respectively, defining a gas portion in the vacuum cap. The gas pressure channel on the base 320 communicates with the gas portion.

In some embodiments, the vacuum cap may also include a jumper spring 303 disposed between the lock 330 and the vacuum diaphragm 380. According to one embodiment of the present application, the vacuum membrane 380 includes one or more shims 381 disposed on either side of the vacuum membrane that may be used to clamp the vacuum membrane 380. The upper spacer contacts one end of the jumper spring 303, and can be used to bear the acting force of the spring, which is beneficial to the stress balance of the vacuum membrane and prevents the damage of the spring to the vacuum membrane.

In some embodiments, the locking member 330 may include a latch boss 331 disposed below the vacuum diaphragm to follow the up and down movement of the vacuum diaphragm. A catch pin 332 is provided in the catch pin holder 331, which can move linearly therein. In some embodiments, the latch seats further include tracks 333 and 334 therein. The catch pin 332 may move along the rails 333 and 334 to ensure positional accuracy of the movement.

In some embodiments, the locking member 330 may further comprise a connector 335 connected at one end to the latch boss 331 and at the other end to the vacuum diaphragm. In some embodiments, the end of the connector 335 that is attached to the membrane may also pass through a jumper spring that may be attached to a support member to facilitate enhanced attachment to a shift pin holder and guide its movement.

The working process of the vacuum cap is approximately as follows: for the oil part, when the oil enters the vacuum cap, the oil pressure can push the supporting piece downwards through the isolating diaphragm, so that the locking piece is pushed, and the self-sealing spring and the gun jumping spring are compressed; the jump gun spring can continuously push the vacuum diaphragm to move downwards, so that a gear pin of the gear pin seat can fall into the driving mechanism to lock the driving mechanism; when the oil liquid is removed from the vacuum cap, the self-sealing spring can push the spring seat upwards without the pressure of the oil liquid, so that the locking piece is pushed upwards, the vacuum membrane can be lifted up, the gear pin seat is driven to move upwards, the gear pin is separated from the driving mechanism, and the driving mechanism is changed into a non-locking state; for the gas part, when the gas between the isolation diaphragm and the vacuum diaphragm is extracted, the vacuum diaphragm moves upwards, the jump gun spring is compressed, the diaphragm is lifted up, the gear pin seat is driven to move upwards, the gear pin is separated from the driving mechanism, and the state of the driving mechanism is changed into an unlocked state.

As will be appreciated by those skilled in the art, there are only two existing ways of refuelling, namely, metering and filling the tank. The operation of the above-mentioned components of the gun will be described in the following in two ways.

In one aspect, upon rated fueling, the fuel dispenser provides fuel to the valve assembly of the fuel dispenser via the hose after a fuel amount is entered into the fuel dispenser. Because the oil way valve core of the oil way valve is not opened, oil can not flow into the liquid channel of the gun body, but can flow into the vacuum cap from the oil pressure channel of the gun body, the locking piece is pushed to move towards the driving mechanism, and then the hanging stop pin can be hung into the driving mechanism. At this time, if the trigger is pulled, the driving mechanism moves toward the valve assembly, and thus the oil path valve core of the oil path valve can be opened. Further, the oil flows to the venturi valve along with the liquid channel of the gun body, pushes the valve core of the venturi valve, flows through the venturi valve and then enters the gun barrel to flow into the oil tank. When the preset limit is added or the preset limit is added quickly, the oiling machine stops oiling, or the oil outlet amount is reduced, and the oil pressure in the rubber tube is reduced. The restoring force of the self-sealing spring in the vacuum cap is larger than the pressure of oil, and the locking piece is pushed to move in the direction away from the driving mechanism, so that the gear engaging pin is separated from the driving mechanism. The oil circuit valve core of the oil circuit valve is pushed by the reset spring to restore to the closed position of the oil circuit valve. The oil can not pass through the oil way valve to stop oiling. Thereby, rated fueling is achieved.

In another case, the filling is stopped when the tank is full. After the oiling machine provides oil to the valve component of the oiling gun through the rubber tube, the oil can not flow into the liquid channel of the gun body because the oil channel valve core of the oil channel valve is not opened, so the oil can flow into the vacuum cap from the oil channel of the gun body, push the locking piece to move towards the direction of the driving mechanism, further hang the hanging pin into the driving mechanism, pull the trigger, the driving mechanism can move towards the valve component, further can open the oil channel valve core of the oil channel valve, the oil can flow to the Venturi valve along with the liquid channel of the gun body, push the valve core of the Venturi valve, flow through the Venturi valve to enter the gun barrel and flow into the oil tank. When oil flows through the venturi valve, a venturi effect is generated, and the venturi valve can supplement air in the oil tank through the vacuum channel of the gun body and the vacuum channel of the gun barrel. When the oil passes through the vacuum passage port of the barrel, the oil is sucked into the venturi valve. Therefore, the venturi valve cannot replenish air from the vacuum channel, and air between the isolation diaphragm and the vacuum diaphragm in the vacuum cap can be sucked out by the gun body air pressure channel. When the venturi valve absorbs air between the isolation diaphragm and the vacuum diaphragm, the vacuum diaphragm can be absorbed to move in a direction away from the driving mechanism, and then the gear engaging pin can be driven to synchronously act so as to separate the gear engaging pin from the driving mechanism. The oil way valve core of the oil way valve can be pushed by the return spring to be restored to the closed position of the oil way valve, and oil cannot pass through the oil way valve. Thereby, the full tank is realized to stop filling.

This application nozzle can realize the oil gas recovery function completely to can also realize the automatic rifle function that closes of refueling in-process, and set up the fluid seepage problem that isolation diaphragm can effectually solve under the low pressure in the vacuum cap, can prevent the oil drip problem when the nozzle refuels once more, the environmental protection and the safety requirement of effectual assurance filling station, and compress tightly isolation diaphragm through a plurality of structure cooperation to isolation diaphragm's setting, can effectually protect isolation diaphragm, alleviate fatigue, reduce isolation diaphragm damaged risk, the effectual life who improves the nozzle.

The above embodiments are provided for illustrating the present invention and not for limiting the present invention, and various changes and modifications may be made by one skilled in the relevant art without departing from the scope of the present invention, therefore, all equivalent technical solutions shall fall within the scope of the present disclosure.

Claims (10)

1. A fuel nozzle with oil and gas recovery function, comprising:

the gun body comprises a liquid channel for oil to pass through and a gas channel for recovering oil and gas;

a valve assembly disposed in the valve assembly cavity of the gun body configured to allow or prevent oil to pass through the liquid passage and oil gas to pass through the gas passage;

a driving mechanism disposed in the driving mechanism cavity of the gun body and configured to control the opening or closing of the valve assembly; and

a vacuum cap disposed in a vacuum cap cavity of the gun body, configured to lock the driving mechanism, causing the driving mechanism to be in a usable state; wherein, a pneumatic channel is arranged between the vacuum cap cavity and the Venturi valve, and an oil pressure channel is arranged between the vacuum cap and the valve component;

the vacuum cap comprises a cavity for accommodating at least part of the locking piece, the air pressure channel and the oil pressure channel are respectively communicated with the cavity, the locking piece can move in the cavity to lock the driving mechanism under the oil pressure action of the oil pressure channel, and the vacuum cap further comprises an isolation diaphragm which is arranged in the cavity and is positioned between the oil pressure channel and the air pressure channel and used for separating the oil pressure channel and the air pressure channel.

2. The fuel dispenser of claim 1, wherein the isolation diaphragm is corrugated in shape and includes one or more depressions and one or more protrusions, the depressions being staggered with respect to the protrusions and the height of the protrusions being greater further down the center of the isolation diaphragm.

3. The fuel dispenser of claim 2, further comprising a securing member for securing the isolation diaphragm in compression within the cavity.

4. The fuel dispenser of claim 3, wherein the securing member includes external threads that threadably engage at least a portion of the cavity.

5. The fuel dispenser of claim 3, further comprising: the positioning ring is arranged between the fixing piece and the isolation diaphragm; the positioning ring comprises one or more positioning pins which are arranged in the cavity wall and limit the linear motion of the positioning ring to push the isolation diaphragm to be compressed.

6. The fuel dispenser of claim 5, wherein the spacer ring is polished to a roughness of less than about ra 0.1.

7. The fuel dispenser of claim 3, further comprising: and the supporting piece is arranged on the locking piece and is contacted with the isolating diaphragm, so that the isolating diaphragm can be supported.

8. The fuel dispenser of claim 7, wherein the support is the same shape as the isolation diaphragm.

9. The fuel dispenser of claim 7, wherein the support is positioned in the collar and is in contact with and reciprocally movable by the inner wall of the collar.

10. The fuel dispenser of claim 1, wherein the vacuum cap is machined and the oil pressure channel or a portion thereof is a straight bore.

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