CN113816328A

CN113816328A - Oil gun and oiling machine considering both vehicle-mounted oil gas recovery system and secondary oil gas recovery system of gas station

Info

Publication number: CN113816328A
Application number: CN202010562078.8A
Authority: CN
Inventors: 修德欣; 王振中; 赵雯晴; 丁莉丽; 贾光
Original assignee: China Petroleum and Chemical Corp; Sinopec Qingdao Safety Engineering Institute
Current assignee: China Petroleum and Chemical Corp; Sinopec Qingdao Safety Engineering Institute
Priority date: 2020-06-18
Filing date: 2020-06-18
Publication date: 2021-12-21

Abstract

The invention relates to the technical field of oil guns, and discloses an oil gun and an oiling machine which take a vehicle-mounted oil gas recovery system and a gas station secondary oil gas recovery system into consideration, wherein the oil gun comprises a vehicle-mounted oil gas recovery induction valve, and a first valve part and a second valve part are positioned on two opposite sides of a valve seat in the radial direction; the first valve portion defines a first valve chamber and includes a first diaphragm and a first valve portion spring connected to the first diaphragm and the valve seat; the second valve part defines a second valve chamber, a second diaphragm and a second valve part spring connected to the second diaphragm and the valve seat; the valve seat is provided with a first valve seat through hole, a throttling through hole and a second valve seat through hole, a valve seat air passage is arranged in the valve seat, the first valve seat through hole and the throttling through hole are respectively communicated with the valve seat air passage and the first valve cavity, the second valve seat through hole is communicated with the valve seat air passage and the second valve cavity, and the first membrane and the second membrane are respectively used for plugging the first valve seat through hole and the second valve seat through hole; a front air path and a rear air path are formed in the oil gun, the front end of the first valve cavity is communicated with the front air path, and the rear end of the second valve cavity is communicated with the rear air path.

Description

Oil gun and oiling machine considering both vehicle-mounted oil gas recovery system and secondary oil gas recovery system of gas station

Technical Field

The invention relates to the technical field of oil guns, in particular to an oil gun and an oiling machine which have both a vehicle-mounted oil gas recovery system and a gas station secondary oil gas recovery system.

Background

GB18352.6-2016 [ limit value for emission of light automobile pollutants and measurement method ], (national Standard six), issued in 2016, in order to meet the standard requirements, domestic vehicles need to be upgraded with vehicle-mounted oil and gas recovery (ORVR) systems since 2020. The oil gas recovery efficiency of the vehicle-mounted oil gas recovery system is up to more than 98%, and once the vehicle-mounted oil gas recovery system is popularized in a large scale, secondary oil gas recovery equipment is replaced.

However, most of the existing gas stations in China are previously installed secondary oil gas recovery systems, which generally comprise an oil gas recovery type oil gun, a coaxial rubber tube, an oil-gas separator, an oil gas recovery vacuum pump and other devices, and the working principle of the secondary oil gas recovery system is that oil gas overflowing from an oil tank opening in the oil filling process is directly pumped back to a buried oil tank through the oil gas recovery vacuum pump.

The vehicle-mounted oil gas recovery system is characterized in that an oil tank of the automobile is transformed, so that the oil filling process forms liquid seal, oil gas enters the vehicle-mounted oil gas recovery activated carbon canister under the action of pressure, and the oil gas is prevented from being discharged into the atmosphere from an oil tank opening.

The replacement of the existing secondary oil gas recovery system to the vehicle-mounted oil gas recovery system is not a matter all the time, and the vehicle-mounted oil gas recovery system needs to be gradually popularized, the popularization process can be as long as several years or even decades, and with the promotion of the national six standards, the number of automobiles provided with the vehicle-mounted oil gas recovery system is increased year by year in the future, so that the vehicle-mounted oil gas recovery system and the traditional secondary oil gas recovery system can coexist in a long time, and even two technologies can coexist in the future. However, the vehicle-mounted oil gas recovery system and the secondary oil gas recovery system have certain differences due to design and operation parameters, an oil gas recovery type oil gun used in the current market can only keep a fixed gas-liquid ratio in the oil filling process, and certain incompatibility can occur when the oil gas recovery type oil gun is used for filling oil to a vehicle-mounted oil gas recovery system automobile, and the problems include that an oil gas recovery vacuum pump cannot extract oil gas in the oil filling process to cause overlarge pressure and stop the automobile, or excessive air is extracted back to an underground oil storage tank to cause the escape and emission of a PV valve.

Disclosure of Invention

The invention aims to provide a fuel gun giving consideration to a vehicle-mounted oil gas recovery system and a secondary oil gas recovery system of a gas station and a fuel dispenser with the fuel gun.

In order to achieve the above object, the present invention provides a fuel gun for both a vehicle-mounted oil gas recovery system and a gas station secondary oil gas recovery system, comprising a fuel gun body and a vehicle-mounted oil gas recovery induction valve, wherein the vehicle-mounted oil gas recovery induction valve is arranged in the fuel gun body, the vehicle-mounted oil gas recovery induction valve comprises a valve seat, a first valve part and a second valve part, and the first valve part and the second valve part are located at two opposite sides of the valve seat in the radial direction; the first valve part comprises a first valve cover mounted on the valve seat to define a first valve cavity between the valve seat and the first valve cover, a first diaphragm positioned between the valve seat and the first valve cover, and a first valve part spring having both ends connected to the first diaphragm and the valve seat, respectively; the second valve part comprises a second valve cover mounted on the valve seat to define a second valve chamber between the valve seat and the second valve cover, and further comprises a second diaphragm located between the valve seat and the second valve cover and a second valve part spring having two ends connected to the second diaphragm and the valve seat, respectively; the valve seat comprises a valve seat shell and a valve seat air passage formed in the valve seat shell, a first valve seat through hole, a throttling through hole and a second valve seat through hole are formed in the valve seat shell, the first valve seat through hole and the throttling through hole are respectively communicated with the valve seat air passage and the first valve cavity, the second valve seat through hole is communicated with the valve seat air passage and the second valve cavity, and the first membrane and the second membrane are arranged to be capable of respectively plugging the first valve seat through hole and the second valve seat through hole when sufficient pressure is applied; a front air passage and a rear air passage are formed in the oil gun, the front end of the first valve cavity is communicated with the front air passage, and the rear end of the second valve cavity is communicated with the rear air passage.

Preferably, the fuel gun further comprises a fuel gun head and a gas collecting hood, the fuel gun head is connected to the front end of the fuel gun body, the gas collecting hood is sleeved on the fuel gun head, the rear end of the gas collecting hood is connected to the fuel gun body, the vehicle-mounted oil gas recovery induction valve is arranged at the outlet of the fuel gun body, a gas collecting hood gas path is formed in the gas collecting hood, a fuel gun body gas path is formed in the fuel gun body, the front gas path is the gas collecting hood gas path, and the rear gas path is the fuel gun body gas path.

Preferably, the valve seat housing is formed with an axially extending cylindrical passage therein, the valve seat includes a valve seat core disposed within the cylindrical passage coaxially therewith, the valve seat core having a cylindrical outer profile and an outer diameter smaller than an inner diameter of the cylindrical passage to form the annular valve seat air passage between the cylindrical passage and the valve seat core.

Preferably, the first valve seat through hole is directed toward a center of the first diaphragm, the second valve seat through hole is directed toward a center of the second diaphragm, the orifice through hole is directed toward an edge of the first diaphragm and an inner diameter of the orifice through hole is smaller than an inner diameter of the first valve seat through hole.

Preferably, a gas-liquid ratio fine adjustment screw is arranged on the fuel gun gas path and used for adjusting the gas flow passing through the fuel gun gas path.

Preferably, the gas collecting hood comprises a corrugated pipe section positioned at the front side, and the corrugated pipe section is provided with an air replenishing hole for connecting the outside and the gas path of the gas collecting hood.

Preferably, a gun hanging lock catch is formed at a position of the gun head of the oil filling gun corresponding to the front end opening of the gas collecting hood, the gun hanging lock catch is a projection radially protruding from the outer wall of the gun head of the oil filling gun, and the projection extends along the circumferential direction of the gun head of the oil filling gun or a plurality of projections are formed along the circumferential direction of the gun head of the oil filling gun.

Preferably, a gun body oil path and an oil pressure chamber of the oil gun connected with each other are formed in the gun body of the oil gun, a flange is formed between the gun body oil path and the oil pressure chamber of the oil gun, the oil gun further comprises a main valve assembly and a gun stopper handle, the main valve assembly comprises a shaft sleeve, an automatic control shaft, a valve core assembly and a valve core spring, the shaft sleeve is sleeved on the automatic control shaft and fixedly arranged, the front end of the valve core assembly is connected to the rear end of the automatic control shaft, the rear end of the valve core assembly abuts against the valve core spring, the front end of the valve core assembly abuts against the flange under the action of the spring force of the valve core spring to block the communication between the gun body oil path and the oil pressure chamber of the oil gun, and the gun stopper handle is connected with the automatic control shaft to move the automatic control shaft along the shaft sleeve; the valve core assembly comprises a small valve core and a large valve core, the large valve core is positioned in front of the small valve core, the front end face of the large valve core can abut against the flange, a through hole is formed in the large valve core, the small valve core can block the through hole, the valve core assembly is arranged in such a way that when the valve core assembly blocks the oil circuit and the oil pressure cavity of the gun body of the oil gun, the automatic control shaft moves backwards, and firstly pushes the small valve core to move backwards for a certain distance and then contacts with the large valve core and pushes the large valve core to move backwards.

Preferably, the automatic control shaft sequentially comprises a small outer diameter section and a large outer diameter section from back to front at the rear end, the rear end of the small outer diameter section penetrates through the through hole in the large valve core and is connected to the small valve core, a bulge is formed on the inner side of the through hole of the large valve core and does not contact with the small outer diameter section, when the valve core assembly cuts off the oil way and the oil pressure cavity of the oil gun body, the large outer diameter section is located in front of the bulge, the automatic control shaft moves backwards for a certain distance, and the large outer diameter section is abutted to the bulge.

Preferably, an air pipe is arranged in the nozzle head of the oil gun so as to limit an air return pipeline in the air pipe, a nozzle head oil way is limited between the shell of the nozzle head of the oil gun and the air pipe, and a gas collecting channel air way is limited between the shell of the nozzle head of the oil gun and the gas collecting channel; and the gas channel of the gas collecting hood, the gas pipe and the shell of the gun head of the oil gun coaxially extend at the rear end of the gun head of the oil gun and the front end of the gun body of the oil gun.

Preferably, the gas collecting hood comprises a corrugated pipe section located on the front side, a pushing member is installed on the rear side of the corrugated pipe section, the fuel gun further comprises a valve core shaft which is arranged in the fuel gun body and can block the gas return pipeline, the pushing member is connected to the valve core shaft so as to drive the valve core shaft to move, and the pushing member is arranged to push the valve core shaft to block the gas return pipeline when the corrugated pipe section is compressed.

Another aspect of the present invention provides a fuel dispenser comprising the fuel gun that is compatible with both an onboard vapor recovery system and a secondary vapor recovery system of a gas station.

In the oil gun considering both the vehicle-mounted oil gas recovery system and the secondary oil gas recovery system of the gas station, the influence of a vacuum pump on the sensing function of the vehicle-mounted oil gas recovery sensing valve can be avoided through the vehicle-mounted oil gas recovery sensing valve with a two-stage structure, the pressure of an oil tank opening can be sensed sharply through a combined pressure sensing structure of a diaphragm and a spring, the opening degree of a gas path is adjusted, when an automobile which is not provided with the vehicle-mounted oil gas recovery system is refueled, the oil gas recovery can be carried out by keeping a gas-liquid ratio of 1-1.2, and when the automobile which is provided with the vehicle-mounted oil gas recovery system is refueled, the gas-liquid ratio can be reduced to 0.2-0.8. The oiling machine is reformed by using the oil gun of the system which gives consideration to both vehicle-mounted oil gas recovery and secondary oil gas recovery of the gas station, and the existing oiling machine can be reformed to be suitable for both the vehicle-mounted oil gas recovery system and the secondary oil gas recovery system of the gas station only by replacing the oil gun without reforming other oiling machine parts.

Drawings

The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate an embodiment of the invention and, together with the description, serve to explain the invention and not to limit the invention. In the drawings:

FIG. 1 shows a schematic side view of a fuel gun for a vehicle-mounted vapor recovery system and a service station secondary vapor recovery system in accordance with an embodiment of the present invention;

FIG. 2 shows a cross-sectional view of the fuel gun of FIG. 1 taken along line A-A of FIG. 1 for both the on-board fuel vapor recovery system and the service station secondary fuel vapor recovery system;

FIG. 3 shows a side cross-sectional view of the fuel gun of FIG. 1 for both the on-board fuel vapor recovery system and the service station secondary fuel vapor recovery system;

FIG. 4 shows a cross-sectional view of the fuel gun of FIG. 3 with both the on-board vapor recovery system and the service station secondary vapor recovery system taken along line B-B of FIG. 3;

FIG. 5 is an enlarged view of the rear half of the fuel gun of FIG. 3 for both the on-board fuel vapor recovery system and the service station secondary fuel vapor recovery system, with emphasis on the main valve assembly portion of the fuel gun body.

Description of the reference numerals

1, a gas-collecting hood; 2 vehicle-mounted oil gas recovery induction valve; 3, a nozzle of a fuel truck nozzle; 4, a gun body of the oil gun; 5, a fuel gun stop handle; 6, a corrugated pipe section; 7 a return gas line; 8 pairs of valves; 9 oil way of the gun body of the oil gun; 10 oil gun body gas circuit; 11, a non-pressure self-sealing assembly; 12 self-control membrane module; 13 shaft sleeve; 14, a self-control shaft; 15 gas channel of gas collecting hood; 16 air supply holes; 17, hanging a gun lock catch; 18 a push plate; 19, a mandril; 20 a spool shaft; 21 self-controlled shaft spring; 22 big valve core; 23 small valve core; a 24 spool spring; 25 oil pressure chambers; 26 air pipes; 27 an attitude valve; 28 a first via; 29 a second through hole; 30 a third via hole; 31 a fourth through hole; 32 a fifth via hole; 33, rolling needles; 34 gas-liquid ratio fine adjustment screw; 35 gun head oil circuit; 36 of a convex shape; 37 small outer diameter sections; 38 large outer diameter section;

201 valve seat; 202 a first valve portion; 203 a second valve portion; 204 throttling the through hole; 205 a first diaphragm; 206 a first valve-portion spring; 207 a first valve cover; 208 a second diaphragm; 209 a second valve portion spring; 210 a second valve cover; 211 valve seat gas circuit; 212 a first valve seat through hole; 213 second valve seat through hole

Detailed Description

In addition, the embodiments of the present invention and the features of the embodiments may be combined with each other without conflict.

In the present invention, it is to be understood that the terms "away", "toward", "circumferential", "axial", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and also correspond to orientations or positional relationships in actual use; the front and the back refer to the front and the back directions of the oil gun, and the gun head of the oil gun is referred to as the front and the gun body is referred to as the back; "inner and outer" refer to the inner and outer relative to the contours of the components themselves and are not intended to indicate that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore should not be construed as limiting the invention.

The present invention will be described in detail below with reference to the accompanying drawings in conjunction with embodiments.

The invention provides a fuel gun considering a vehicle-mounted oil gas recovery system and a secondary oil gas recovery system of a gas station, which comprises a fuel gun body 4 and a vehicle-mounted oil gas recovery induction valve 2, wherein the vehicle-mounted oil gas recovery induction valve 2 is arranged in the fuel gun body 4, the vehicle-mounted oil gas recovery induction valve 2 comprises a valve seat 201, a first valve part 202 and a second valve part 203, and the first valve part 202 and the second valve part 203 are positioned on two opposite sides of the valve seat 201 in the radial direction; the first valve part 202 comprises a first valve cover 207 mounted on the valve seat 201 to define a first valve chamber between the valve seat 201 and the first valve cover 207, the first valve part 202 further comprises a first diaphragm 205 located between the valve seat 201 and the first valve cover 207, and a first valve part spring 206 having two ends connected to the first diaphragm 205 and the valve seat 201, respectively; the second valve part 203 comprises a second valve cover 210 mounted on the valve seat 201 to define a second valve chamber between the valve seat 201 and the second valve cover 210, the second valve part 203 further comprises a second diaphragm 208 located between the valve seat 201 and the second valve cover 210, and a second valve part spring 209 connected at both ends to the second diaphragm 208 and the valve seat 201, respectively; the valve seat 201 comprises a valve seat shell and a valve seat air passage 211 formed inside the valve seat shell, a first valve seat through hole 212, a throttle through hole 204 and a second valve seat through hole 213 are formed on the valve seat shell, the first valve seat through hole 212 and the throttle through hole 204 are respectively communicated with the valve seat air passage 211 and the first valve cavity, the second valve seat through hole 213 is communicated with the valve seat air passage 211 and the second valve cavity, and the first diaphragm 205 and the second diaphragm 208 are arranged to be capable of respectively blocking the first valve seat through hole 212 and the second valve seat through hole 213 when sufficient pressure is applied; a front air passage and a rear air passage are formed in the oil gun, the front end of the first valve cavity is communicated with the front air passage, and the rear end of the second valve cavity is communicated with the rear air passage.

In the fuel gun considering both the vehicle-mounted oil gas recovery system and the secondary oil gas recovery system of the gas station, the vehicle-mounted oil gas recovery induction valve 2 is a two-stage valve and comprises a first valve part 202 and a second valve part 203. If oil and gas are overflowed from the oil tank port during the refueling process of a vehicle without the vehicle-mounted oil and gas recovery system, the gas spaces (the first valve chamber and the second valve chamber) of the first valve part 202 and the second valve part 203 are both in positive pressure, the first valve part 202 and the second valve part 203 are both in an open state, namely the first diaphragm 205 in the first valve part 202 is close to or abutted against the first valve cover 207 under the action of the first valve part spring 206, the second diaphragm 208 in the second valve part 203 is close to or abutted against the second valve cover 210 under the action of the second valve part spring 209, neither the first valve seat through hole 212 nor the second valve seat through hole 213 is shielded, the recovered oil and gas enter the first valve part 202 through the front gas passage, then reach the valve seat gas passage 211 through the first valve seat through hole 212 and the throttle through hole 204, then enter the second valve chamber of the second valve part 203 through the second valve seat through hole 213, and then enter the rear gas passage, at the moment, the resistance of the whole gas circuit for oil gas recovery is small, and the gas-liquid ratio is kept at a high value; if in the process of refueling a vehicle equipped with the vehicle-mounted oil gas recovery system, oil gas does not overflow from the oil tank port, at the moment, the gas space (the first valve cavity) of the first valve part 202 is under negative pressure, the first diaphragm 205 can compress the first valve part spring 206 under the action of the negative pressure and completely block the first valve seat through hole 212, the oil gas can only enter the valve seat gas path 211 through the throttling through hole 204, at the moment, the resistance of the oil gas recovery gas path is relatively large, the second valve part 203 is in a semi-open state under the influence of the suction force of the vacuum pump, namely, the second diaphragm 208 in the second valve part 203 is continuously or discontinuously close to or clings to the second valve seat through hole 213 under the action of the negative pressure, so that the second valve seat through hole 213 is partially or discontinuously opened, and the gas-liquid ratio is kept at a relatively low value.

The oiling gun considering the vehicle-mounted oil gas recovery system and the secondary oil gas recovery system of the gas station can avoid the influence of the vacuum pump on the sensing function of the vehicle-mounted oil gas recovery sensing valve 2 through the vehicle-mounted oil gas recovery sensing valve 2 with the two-stage structure, can sensitively sense the pressure of an oil tank port, and automatically adjust the gas-liquid ratio to a proper range (equivalent to automatically identifying the vehicle type and adjusting the gas-liquid ratio to be suitable for the vehicle type) so as to adapt to different vehicle types. Safety conditions in the station are improved, and the physical health of the staff is guaranteed; in addition, the vehicle-mounted oil gas recovery induction valve 2 of the oil gun is of a pure mechanical structure, is long in service life and is not easy to damage.

In general, through design, the oil gun considering the vehicle-mounted oil gas recovery system and the gas station secondary oil gas recovery system can keep a gas-liquid ratio of 1-1.2 for oil gas recovery as a common oil gun when an automobile not provided with the vehicle-mounted oil gas recovery system is filled with oil, and the gas-liquid ratio can be reduced to 0.2-0.8 when the automobile provided with the vehicle-mounted oil gas recovery system is filled with oil. In some embodiments, the first valve spring 206 is set to provide a pressure between 100Pa and 1000Pa for maximum deformation, and the second valve spring 209 is set to provide a pressure between 1000Pa and 18000Pa for maximum deformation, so as to adjust the gas-liquid ratio to a suitable range for different vehicle models.

Specifically, the oil gun can include an oil gun head 3 and a gas collecting hood 1, the oil gun head 3 is connected to the front end of the oil gun body 4, the gas collecting hood 1 is sleeved on the oil gun head 3, and the rear end of the gas collecting hood is connected to the oil gun body 4.

In some embodiments, the first diaphragm 205 is near the muzzle (front) side of the fuel gun, primarily for detecting vacuum at the fuel tank port; the second diaphragm 208 is being close to oil gas recovery vacuum pump (rear) side, and oil gas recovery vacuum pump starts among the refueling process, leads to the inside gas circuit of nozzle to appear the vacuum, and second valve portion 203 has certain air lock effect this moment, can avoid the operation of vacuum pump to lead to first valve portion 202 to close.

Preferably, on-vehicle vapor recovery system response valve 2 set up in the exit of the nozzle body 4, be formed with gas collecting channel gas circuit 15 in the gas collecting channel 1, be formed with nozzle body gas circuit 10 in the nozzle body 4, preceding gas circuit does gas collecting channel gas circuit 15, the back gas circuit does nozzle body gas circuit 10 sets up on-vehicle vapor recovery system response valve 2 in being close to nozzle head 3, can make on-vehicle vapor recovery system response valve 2 more acute to the forced induction of fuel tank port.

Wherein the peripheral edge of the first membrane 205 and the peripheral edge of the second membrane 208 respectively fit on the outer wall of the valve seat 201 facing the first valve cover 207 and the outer wall of the valve seat 201 facing the second valve cover 210.

Further, referring to fig. 3, the valve seat housing is formed with an axially extending cylindrical passage therein, and the valve seat 201 includes a valve seat core disposed within the cylindrical passage coaxially therewith, the valve seat core having a cylindrical outer profile and an outer diameter smaller than an inner diameter of the cylindrical passage to form the annular valve seat air passage 211 therebetween.

Specifically, in the vehicle-mounted oil and gas recovery induction valve 2, the first valve seat through hole 212 faces the center of the first diaphragm 205, the second valve seat through hole 213 faces the center of the second diaphragm 208, so that the first valve seat through hole 212 can be better sealed and the second valve seat through hole 213 can be semi-closed under pressure, the throttling through hole 204 faces the edge of the first diaphragm 205, and the inner diameter of the throttling through hole 204 is smaller than that of the first valve seat through hole 212.

Preferably, a gas-liquid ratio fine adjustment screw 34 is arranged on the fuel nozzle gun gas circuit 10 and used for adjusting the gas flow rate in the fuel nozzle gun gas circuit 10, and the gas-liquid ratio fine adjustment screw 34 can be manually adjusted when needed. The gas-liquid ratio fine adjustment screw 34 can control the flow cross section of the gas path 10 of the gun body of the oil filling gun by inserting the depth of the gas path 10 of the gun body of the oil filling gun, so that the gas resistance is influenced, and the gas-liquid ratio is adjusted.

In a preferred embodiment, the gas collecting hood 1 includes a corrugated pipe section 6 at the front side, and the corrugated pipe section 6 is formed with gas filling holes 16 to connect the outside and the gas collecting hood gas path 15. The air supply holes 16 at the corrugated pipe section 6 of the gas collecting hood 1 are used for supplying air when the oil amount is insufficient in the oil gas recovery process or discharging redundant oil gas in the oil gas recovery process. Taking the embodiment as an example, when the gas-liquid ratio is 1.1, when an automobile which is not equipped with the vehicle-mounted oil-gas recovery system is refueled, oil gas overflowing from an oil tank is equal to the refueled volume, the return gas quantity is insufficient at the moment, and outside air enters the gas collecting hood 1 through the gas supplementing hole 16, so that the problem that the first valve part 202 of the vehicle-mounted oil-gas recovery induction valve 2 is closed due to overlarge vacuum in the gas collecting hood 1 or the automatic control membrane component 12 is triggered to act to jump a gun can be avoided, therefore, in this case, the gas supplementing structure is arranged for the gas collecting hood 1, and the problem that the gun jumps due to the overhigh vacuum degree of the oil tank opening in the process of refueling the automobile which is not equipped with the vehicle-mounted oil-gas recovery system can be reduced; when the gas-liquid ratio is 0.8, when an automobile which is not provided with the vehicle-mounted oil gas recovery system is refueled, oil gas overflowing from an oil tank is equal to the refueled volume, the oil gas cannot be completely recovered through a refueling gun, and at the moment, part of the oil gas is discharged to the outside through a gas supplementing hole 16; and when the gas-liquid ratio is 0.3, when the automobile provided with the vehicle-mounted oil-gas recovery system is refueled, no oil gas overflows in the oil tank, the air return quantity is insufficient at the moment, the outside air enters the gas collecting hood 1 through the air supplementing hole 16, and the air supplementing hole 16 can prevent the front end of the vacuum pump from being completely blocked, so that the pump is damaged.

Further, a gun hanging lock catch 17 is formed at the position, corresponding to the front end opening of the gas collecting channel 1, of the oil gun head 3, the gun hanging lock catch 17 is formed as a protruding block protruding from the outer wall of the oil gun head 3 in the radial direction, and the protruding block extends aaqa along the circumferential direction of the oil gun head 3 or a plurality of protruding blocks are formed along the circumferential direction of the oil gun head 3. Therefore, the gas collecting hood 1 and the oil filler are compressed and sealed in the oil filling process, the gun hanging lock catch 17 is matched with a standard oil tank port, when the gun hanging lock catch 17 is hung tightly, the gas collecting hood 1 is extruded and acts together with the convex block to fix the oil filler port, an operator does not need to manually hold the oil filler, and therefore the gun hanging lock catch 17 avoids the situation that an oil filler needs to hold and compress the gas collecting hood in a hand-held mode in the oil filler using process.

In addition, referring to fig. 1, the interior of the fuel gun body 4 is formed with a fuel gun body oil passage 9 and an oil pressure chamber 25 which are connected to each other, a flange is formed between the oil circuit 9 of the oil gun body and the oil pressure cavity 25, the oil gun also comprises a main valve component and an oil gun baffle handle 5, the main valve assembly comprises a shaft sleeve 13, a self-control shaft 14, a valve core assembly and a valve core spring 24, the shaft sleeve 13 is sleeved on the self-control shaft 14 and is fixedly arranged, the front end of the valve core assembly is connected with the rear end of the self-control shaft 14, the rear end of the valve core assembly is abutted against the valve core spring 24, and the front end of the valve core component is abutted against the flange under the action of the spring force of the valve core spring 24 so as to cut off the communication between the oil gun body oil path 9 and the oil pressure cavity 25, the fuel nozzle stop handle 5 is connected with the automatic control shaft 14 so as to move the automatic control shaft 14 along the shaft sleeve 13; preferably, the valve core assembly comprises a small valve core 23 and a large valve core 22, the large valve core 22 is located in front of the small valve core 23, the front end face of the large valve core 22 can abut against the flange, a through hole is formed in the large valve core 22, the small valve core 23 can block the through hole, the valve core assembly is arranged such that when the valve core assembly blocks the oil gun body oil path 9 and the oil pressure cavity 25, the automatic control shaft 14 moves backwards, and the automatic control shaft 14 firstly pushes the small valve core 23 to move backwards for a certain distance and then contacts with the large valve core 22 and pushes the large valve core 23 to move backwards.

In this preferred embodiment, the valve core assembly is designed in the form of a double valve core, the contact portion of the self-control shaft 14 and the valve core assembly is set in the form of two steps, and the self-control shaft 14 moves to the right in fig. 1 to firstly open the small valve core 23 and then moves a certain distance to contact the large valve core 22 to open the large valve core 22. When the oiling operation is started, firstly, the oil pump of the oiling machine is started, the pressure exists in the oil pressure cavity 25, the large valve core 22 abuts against the flange and cuts off the oil gun body oil path 9 and the oil pressure cavity 25, an operator buckles the oil gun stopper handle 5, force is applied to the automatic control shaft 14 to enable the automatic control shaft 14 to move backwards along the shaft sleeve 13 (move rightwards in the figure 1), the pressure difference between two sides of the small valve core 22 is relatively small at the moment, the automatic control shaft 14 moves backwards, the rear end of the automatic control shaft 14 firstly pushes the small valve core 23, at the moment, fuel in the oil pressure cavity 25 flows forwards from a gap between the small valve core 23 and the large valve core 22 and the through hole on the large valve core 22 to enter the oil gun body oil path 9, the pressure difference between two ends of the large valve core 22 is reduced, then the automatic control shaft 14 continues to move backwards to push the large valve core 22, labor is saved, and therefore, the oil gun oil path is easier to open by the optimized implementation mode, the labor intensity in the trigger pulling process is reduced, and the oil gun is easier to open.

More specifically, the self-control shaft 14 includes a small outer diameter section 37 and a large outer diameter section 38 in sequence from back to front at the rear end, the rear end of the small outer diameter section 37 passes through the through hole on the large valve core 22 and is connected to the small valve core 23, a protrusion 36 is formed on the inner side of the through hole of the large valve core 22, the protrusion 36 is not in contact with the small outer diameter section 37, when the valve core assembly blocks the oil passage 9 and the oil pressure chamber 25 of the fuel gun body, the large outer diameter section 38 is located in front of the protrusion 36, the self-control shaft 14 moves backwards for a certain distance, and the large outer diameter section 38 abuts against the protrusion 36, so that when the self-control shaft 14 continues to move backwards, the large valve core 22 can be pushed backwards by the large outer diameter section 38 abutting against the protrusion 36.

In addition, referring to fig. 1 and 4, in some embodiments, an air pipe 26 is arranged in the fuel gun head 3 to define the return air pipeline 7 in the air pipe 26, a head oil circuit 35 is defined between the housing of the fuel gun head 3 and the air pipe 26, and the gas collecting channel 15 is defined between the housing of the fuel gun head 3 and the gas collecting channel 1; and the gas collecting channel 15, the gas pipe 26 and the shell of the oil gun head 3 coaxially extend at the rear end of the oil gun head 3 and the front end of the oil gun body 4.

Further, the gas collecting hood 1 is located on the corrugated pipe section 6 on the front side, a pushing member is installed on the rear side, the fuel gun further comprises a valve core shaft 20 which is arranged in the fuel gun body 4 and can seal the gas return pipeline 7, the pushing member is connected to the valve core shaft 20 so as to drive the valve core shaft 20 to move, and the pushing member is arranged to push the valve core shaft 20 to seal the gas return pipeline 7 when the corrugated pipe section 6 is compressed. The pushing piece comprises a pushing plate 18 and an ejector rod 19, the pushing plate 18 is installed at the corrugated pipe section 6, the pushing plate 18 is connected with the ejector rod 19, the ejector rod 19 can drive the valve core shaft 20 to reciprocate, the pushing plate 18 and the ejector rod 19 can be driven to move backwards when the gas collecting hood 1 is compressed, and the ejector rod 19 pushes the valve core shaft 20 to block the gas return pipeline 7.

The air return line 7 can be connected with (including): the air pipe 26, the attitude valve 27, the first through hole 28, the second through hole 29, the third through hole 30, the fourth through hole 31, and the fifth through hole 32. The rear end of the air pipe 26 is provided with an attitude valve 27 which is connected with the attitude valve 27; the tail part of the oil gun head 3 is provided with an auxiliary valve 8, and the air return pipeline 7 is connected with the auxiliary valve 8 through a first through hole 28; the air return pipeline 7 is controlled by the valve core shaft 20 to be opened or closed; the top of the gun body 4 of the oil gun is provided with a non-pressure self-sealing assembly 11 and an automatic control membrane assembly 12, and the gas return pipeline 7 is connected with the automatic control membrane assembly 12 through a fourth through hole 31 and a fifth through hole 32. When the air return pipeline 7 is unobstructed (opened), the oil gun can normally supply oil, and when the air return pipeline 7 is closed, the oil gun can not normally supply oil.

The opening and closing of the third through hole 30 is controlled by the valve core shaft 20, when the gas collecting hood 1 is in a normal position, the valve core shaft 20 closes the gas return pipeline 7, and the oil gun cannot fill oil; when the gas collecting hood 1 is extruded, the push plate 18 moves backwards, the valve core shaft 20 does not block the return air pipeline 7 any more, the return air pipeline 7 is smooth, and the oil gun can normally supply oil.

Wherein, a sealing steel ball is arranged in the attitude valve 27, the valve seat is conical, when the gun mouth of the oil gun is filled with oil downwards normally, the steel ball leaves the conical surface, the attitude valve 27 is opened, and the air return pipeline 7 is unobstructed; when the gun opening of the oil gun is filled with oil upwards, the steel ball enters the conical surface, the attitude valve 27 is closed, the air return pipeline 7 is sealed, vacuum is formed in the air return pipeline 7, the vacuum acts on the automatic control membrane component 12 through the fourth through hole 31 and the fifth through hole 32, the automatic control membrane overcomes the spring pressure to move upwards, the roller pin 33 is led to move upwards out of the clamping groove of the automatic control shaft 14, the automatic control shaft 14 moves leftwards under the action of the automatic control shaft spring 21, the oil path of the oil gun is disconnected, the structure ensures that the oil cannot be filled when the gun opening of the oil gun is upwards, and the oil filling misoperation is prevented.

Moreover, the valve seat of the secondary valve 8 is of a venturi structure, during refueling, when fuel flows through the secondary valve 8, a certain negative pressure is generated, and at this time, gas at the nozzle of the refueling gun enters the secondary valve 8 along the gas return pipeline 7 through the gas pipe 26, the attitude valve 27, the second through hole 29, the third through hole 30 and the first through hole 28.

Another aspect of the present invention provides a fuel dispenser comprising a fuel gun according to the present invention that is compatible with both an onboard vapor recovery system and a secondary vapor recovery system at a service station.

The preferred embodiments of the present invention have been described in detail above with reference to the accompanying drawings, but the present invention is not limited thereto. Within the scope of the technical idea of the invention, many simple modifications can be made to the technical solution of the invention. Including each of the specific features, are combined in any suitable manner. The invention is not described in detail in order to avoid unnecessary repetition. Such simple modifications and combinations should be considered within the scope of the present disclosure as well.

Claims

1. A fuel gun giving consideration to a vehicle-mounted oil and gas recovery system and a gas station secondary oil and gas recovery system comprises a fuel gun body (4) and a vehicle-mounted oil and gas recovery induction valve (2), wherein the vehicle-mounted oil and gas recovery induction valve (2) is arranged in the fuel gun body (4), and is characterized in that the vehicle-mounted oil and gas recovery induction valve (2) comprises a valve seat (201), a first valve part (202) and a second valve part (203), and the first valve part (202) and the second valve part (203) are positioned on two opposite sides of the valve seat (201) in the radial direction; the first valve part (202) comprises a first valve cover (207) mounted on the valve seat (201) to define a first valve cavity between the valve seat (201) and the first valve cover (207), the first valve part (202) further comprises a first diaphragm (205) between the valve seat (201) and the first valve cover (207) and a first valve part spring (206) connected at both ends to the first diaphragm (205) and the valve seat (201), respectively; the second valve part (203) comprises a second valve cover (210) mounted on the valve seat (201) to define a second valve chamber between the valve seat (201) and the second valve cover (210), the second valve part (203) further comprises a second diaphragm (208) located between the valve seat (201) and the second valve cover (210) and a second valve part spring (209) connected at both ends to the second diaphragm (208) and the valve seat (201), respectively; the valve seat (201) comprises a valve seat shell and a valve seat air passage (211) formed inside the valve seat shell, a first valve seat through hole (212), a throttling through hole (204) and a second valve seat through hole (213) are formed in the valve seat shell, the first valve seat through hole (212) and the throttling through hole (204) are respectively communicated with the valve seat air passage (211) and the first valve cavity, the second valve seat through hole (213) is communicated with the valve seat air passage (211) and the second valve cavity, and the first diaphragm (205) and the second diaphragm (208) are arranged to be capable of respectively plugging the first valve seat through hole (212) and the second valve seat through hole (213) when sufficient pressure is applied; a front air passage and a rear air passage are formed in the oil gun, the front end of the first valve cavity is communicated with the front air passage, and the rear end of the second valve cavity is communicated with the rear air passage.

2. The fuel gun considering both the vehicle-mounted oil and gas recovery system and the secondary oil and gas recovery system of the gas station according to claim 1, further comprising a fuel gun head (3) and a gas collecting hood (1), wherein the fuel gun head (3) is connected to the front end of the fuel gun body (4), the gas collecting hood (1) is sleeved on the fuel gun head (3) and the rear end of the fuel gun body (4) is connected to the fuel gun body (4), the vehicle-mounted oil and gas recovery induction valve (2) is arranged at the outlet of the fuel gun body (4), a gas collecting hood gas circuit (15) is formed in the gas collecting hood (1), a fuel gun body gas circuit (10) is formed in the fuel gun body (4), the front gas circuit is the gas collecting hood gas circuit (15), and the rear gas circuit is the fuel gun body gas circuit (10).

3. The fuel gun for both the vehicle-mounted oil and gas recovery system and the secondary oil and gas recovery system of the gas station according to claim 2, wherein a gas-liquid ratio fine adjustment screw (34) is arranged on the fuel gun body gas path (10) for adjusting the gas flow rate through the fuel gun body gas path (10).

4. The fuel nozzle for both the vehicle-mounted oil and gas recovery system and the secondary oil and gas recovery system of the gas station as claimed in claim 2, wherein the gas collecting hood (1) comprises a corrugated pipe section (6) at the front side, and the corrugated pipe section (6) is formed with a gas supplementing hole (16) for connecting the outside and the gas collecting hood gas path (15).

5. The fuel nozzle for both an onboard vapor recovery system and a secondary vapor recovery system of a gasoline station as set forth in claim 1, wherein the valve seat housing is formed with an axially extending cylindrical passage inside, the valve seat (201) comprises a valve seat core disposed within the cylindrical passage coaxially with the cylindrical passage, the valve seat core having a cylindrical outer profile and an outer diameter smaller than an inner diameter of the cylindrical passage to form the annular valve seat air passage (211) between the cylindrical passage and the valve seat core.

6. The fuel gun for both an on-board fuel vapor recovery system and a service station secondary fuel vapor recovery system according to claim 1, wherein the first valve seat through hole (212) is directed toward the center of the first diaphragm (205), the second valve seat through hole (213) is directed toward the center of the second diaphragm (208), the throttle through hole (204) is directed toward the edge of the first diaphragm (205) and the inner diameter of the throttle through hole (204) is smaller than the inner diameter of the first valve seat through hole (212).

7. The fuel gun considering both the vehicle-mounted oil-gas recovery system and the secondary oil-gas recovery system of the gas station according to claim 1, further comprising a fuel gun head (3) and a gas collecting hood (1), wherein a gun hanging lock catch (17) is formed at a position corresponding to a front end opening of the gas collecting hood (1) on the fuel gun head (3), the gun hanging lock catch (17) is formed as a projection protruding radially from an outer wall of the fuel gun head (3), and the projection extends along the circumferential direction of the fuel gun head (3) or forms a plurality of projections along the circumferential direction of the fuel gun head (3).

8. The fuel gun of claim 1, wherein a fuel gun body oil path (9) and an oil pressure chamber (25) connected with each other are further formed inside the fuel gun body (4), a flange is formed between the fuel gun body oil path (9) and the oil pressure chamber (25), the fuel gun further comprises a main valve assembly and a fuel gun stopper (5), the main valve assembly comprises a shaft sleeve (13), a self-control shaft (14), a valve core assembly and a valve core spring (24), the shaft sleeve (13) is sleeved on the self-control shaft (14) and fixedly arranged, the front end of the valve core assembly is connected to the rear end of the self-control shaft (14), the rear end of the valve core assembly abuts against the valve core spring (24), and the front end of the valve core assembly abuts against the flange under the action of the spring force of the valve core spring (24) to block the fuel gun body oil path (9) ) The oil gun gear handle (5) is connected with the automatic control shaft (14) so as to move the automatic control shaft (14) along the shaft sleeve (13); the valve core assembly comprises a small valve core (23) and a large valve core (22), the large valve core (22) is located in front of the small valve core (23), the front end face of the large valve core (22) can abut against the flange, a through hole is formed in the large valve core (22), the small valve core (23) can block the through hole, the valve core assembly is arranged in a manner that when the valve core assembly blocks the oil way (9) and the oil pressure cavity (25) of the gun body, the automatic control shaft (14) moves backwards, the automatic control shaft (14) firstly pushes the small valve core (23) to move backwards for a certain distance and then contacts with the large valve core (22) and pushes the large valve core (23) to move backwards.

9. The fuel gun considering both the vehicle-mounted oil and gas recovery system and the secondary oil and gas recovery system of the filling station according to claim 8, wherein the self-control shaft (14) sequentially comprises a small outer diameter section (37) and a large outer diameter section (38) from back to front at the rear end, the rear end of the small outer diameter section (37) penetrates through the through hole in the large valve core (22) to be connected to the small valve core (23), a protrusion (36) is formed inside the through hole in the large valve core (22), the protrusion (36) is not in contact with the small outer diameter section (37), when the valve core assembly cuts off the fuel gun body fuel path (9) and the oil pressure chamber (25), the large outer diameter section (38) is located in front of the protrusion (36), the self-control shaft (14) moves backwards for a certain distance, and the large outer diameter section (38) abuts against the protrusion (36).

10. The fuel gun considering both the vehicle-mounted oil-gas recovery system and the secondary oil-gas recovery system of the gas station according to claim 1, further comprising a fuel gun head (3) and a gas collecting hood (1), wherein the fuel gun head (3) is connected to the front end of the fuel gun body (4), the gas collecting hood (1) is sleeved on the fuel gun head (3) and the rear end is connected to the fuel gun body (4); an air pipe (26) is arranged in the oil gun head (3) to limit an air return pipeline (7) in the air pipe (26), an oil pipe head oil way (35) is limited between the shell of the oil gun head (3) and the air pipe (26), and an air collecting channel air passage (15) is limited between the shell of the oil gun head (3) and the air collecting channel (1); and the gas collecting channel (15), the gas pipe (26) and the shell of the oil gun head (3) coaxially extend at the rear end of the oil gun head (3) and the front end of the oil gun body (4).

11. The fuel gun for both the vehicle-mounted oil and gas recovery system and the secondary oil and gas recovery system of the gas station according to claim 10, wherein the gas collecting hood (1) comprises a bellows section (6) located at the front side, a pushing member is installed at the rear side of the bellows section (6), the fuel gun further comprises a valve core shaft (20) which is arranged in the fuel gun body (4) and can block the gas return pipeline (7), and the pushing member is connected to the valve core shaft (20) so as to drive the valve core shaft (20) to move and is arranged to push the valve core shaft (20) to a state of blocking the gas return pipeline (7) when the bellows section (6) is compressed.

12. A fuel dispenser, characterized in that it comprises a fuel gun according to any one of claims 1-11 compatible with an onboard vapor recovery system and a secondary vapor recovery system of a service station.