CN211688238U - Oil gun driving mechanism with dry measurement function and oil gun - Google Patents

Abstract

The utility model relates to a nozzle actuating mechanism and nozzle of function are surveyed futilely in area, include: a fixed bushing including a first opening; a drive bushing including a second opening; the driving shaft is provided with a dry measuring hole; wherein the dry-test hole is adapted to receive a locking member from outside the fuel nozzle through the first and second openings; wherein the drive shaft and the drive sleeve are locked when the locking member is received in the dry test hole. The utility model discloses a be provided with the U-shaped groove to drive axle sleeve head, be provided with in the drive shaft and survey the hole futilely for even the nozzle is under the condition of not producing oil, also can realize detecting the vapor recovery system and compare. Compared with a wet-type detection oil gas recovery ratio, the dry-type detection oil gas recovery ratio greatly simplifies the detection process, does not reduce the oil quality, and avoids the harm to human bodies and the environmental pollution.

Description

Oil gun driving mechanism with dry measurement function and oil gun

Technical Field

The utility model relates to an refueling equipment field relates to a nozzle actuating mechanism and nozzle of function are surveyed futilely in area especially.

Background

The fuel gun is the output terminal of the fuel charger in the gas station and is used for adding gasoline and the like into the fuel tank of the automobile. Most of the oil guns all have the oil gas recovery function at present. The oil gas recovery function of the oil filling gun can recover oil gas volatile matters generated when an automobile is filled with oil into the oil storage system, so that the environmental pollution and the resource waste are reduced.

The gas-liquid recovery ratio of the refueling system in each country or region has different standards. For example, typical fueling guns have gas to liquid recovery ratios between 100% and 120%. Therefore, before the fueling gun leaves the factory, whether the relevant standard is met or not needs to be detected. The traditional test method adopts a wet test method, namely, a fuel gun is connected with a fuel dispenser, and the gas-liquid recovery ratio is finally calculated by measuring the volume of discharged oil and the volume of recovered gas. The wet detection method has a complicated detection process; further, the discharged oil is returned again, which may reduce the quality of the oil. Therefore, there is a need for a new method to replace the wet detection method.

SUMMERY OF THE UTILITY MODEL

To the technical problem who exists among the prior art, the utility model provides an actuating mechanism of nozzle, include: a fixed bushing including a first opening; a drive bushing including a second opening; the driving shaft is provided with a dry measuring hole; wherein the dry-test hole is adapted to receive a locking member from outside the fuel nozzle through the first and second openings; wherein the drive shaft and the drive sleeve are locked when the locking member is received in the dry test hole.

The drive mechanism as described above, wherein the drive shaft is fitted in the drive boss, and the drive boss is fitted in the fixed boss; wherein the drive shaft is capable of relative axial movement along the drive sleeve when the drive shaft is unlocked from the drive sleeve.

The drive mechanism as described above, wherein the first opening is an opening for a portion of the trigger assembly that is connected to the drive shaft.

The driving mechanism as described above, wherein the first opening is a kidney-shaped hole extending from both sides to a middle part of the head of the fixed collar.

The drive mechanism as described above, wherein the head of the fixed sleeve is tapered.

The driving mechanism as described above, wherein the second opening is an opening corresponding to a dry hole location.

The drive mechanism as described above, further comprising a return spring fitted between the drive shaft and the drive sleeve.

The drive mechanism as described above, wherein the second opening is a U-shaped groove; the locking member received in the dry test hole is also adapted to be received in the U-shaped slot when the return spring returns the drive shaft to a position away from the drive sleeve.

The driving mechanism as described above, wherein the fixed sleeve includes a first strip-shaped hole; the driving shaft sleeve comprises a second strip-shaped hole, and the driving shaft comprises a positioning hole; the positioning piece is suitable for being contained in the positioning hole, the first strip-shaped hole and the second strip-shaped hole.

According to the utility model discloses an on the other hand provides an oil gun, include: a gun body; a valve assembly configured to allow or block oil and gas from passing through the gun body; a drive mechanism configured to control the valve assembly; and a trigger assembly configured to drive axial movement of a drive shaft in the drive mechanism.

The fuel gun as described above, wherein when the locking member is received in the dry test opening, the drive shaft and the drive boss are locked and the trigger assembly actuates the drive mechanism to open the valve assembly.

The fuel gun as described above wherein when the drive shaft and drive sleeve are unlocked, the trigger assembly drives axial movement of the drive shaft relative to the drive sleeve in the drive mechanism and the valve assembly remains closed.

According to the utility model discloses an on the other hand provides a dry testing method of vapor recovery system of nozzle, include: keeping the gasoline pump in a closed state; receiving a locking member in a dry-side bore of a drive shaft of the fuel gun; pulling the trigger assembly to simulate the oil outlet of the oil gun and recover oil gas; and obtaining the simulated oil volume and the recovered gas volume at intervals, and calculating the oil gas recovery ratio.

The utility model discloses a be provided with the U-shaped groove to drive axle sleeve head, be provided with in the drive shaft and survey the hole futilely for even the nozzle is under the condition of not producing oil, also can realize detecting the vapor recovery system and compare. Compared with a wet-type detection oil gas recovery ratio, the dry-type detection oil gas recovery ratio greatly simplifies the detection process, does not reduce the oil quality, and avoids the harm to human bodies and the environmental pollution.

Drawings

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

FIG. 1 is a perspective view of a fuel gun according to one embodiment of the present invention;

FIG. 2 is a schematic cross-sectional view of a fuel gun according to an embodiment of the present invention;

fig. 3 is an exploded view of a drive mechanism according to an embodiment of the present invention;

fig. 4 is a front view of a drive mechanism according to an embodiment of the present invention;

fig. 5 is a cross-sectional view of a drive mechanism according to an embodiment of the present invention;

fig. 6 is a bottom exploded view of a drive mechanism according to an embodiment of the present invention;

fig. 7 is a bottom view of a drive mechanism according to an embodiment of the present invention;

FIG. 8 is a schematic diagram of a dry gas-liquid recovery ratio for a fuel gun according to an embodiment of the present invention; and

fig. 9 is a flow chart of a method for detecting a gas-liquid recovery ratio by dry measurement according to an embodiment of the present invention.

Detailed Description

In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, 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 obvious that the described embodiments are some, but not all, embodiments of the present invention. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.

In the following detailed description, reference is made to the accompanying drawings that form a part hereof and in which is shown by way of illustration specific embodiments of the application. In the drawings, like 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 and structural, logical or electrical changes may be made to the embodiments of the present application.

To the problem, the utility model discloses offered dry survey hole on the actuating mechanism of nozzle. When detecting the gas-liquid recovery ratio, only the locking piece needs to be inserted into the dry testing hole. At the moment, the trigger of the oil gun is pulled again, the oil gas recovery hole of the oil gun can work, but the oil outlet cannot produce oil. A dry testing method is used for replacing a wet testing method, and the oil can be produced without actual oil, so that the testing process is reduced, and the testing time is saved.

Fig. 1 is a perspective view of a fuel nozzle according to an embodiment of the present invention. Fig. 2 is a schematic cross-sectional view of a fuel gun according to an embodiment of the present invention. As shown, the fuel gun 100 includes a gun body 110 including an oil inlet 101 and an oil outlet 102, wherein the oil inlet 101 includes inlet threads that may be connected to a hose and, in turn, to a fuel dispenser. According to one embodiment of the present application, the inlet thread is M34 × 1.5. The oil liquid of the oiling machine enters the oil inlet of the gun body and then flows out from the oil outlet of the gun body. According to one embodiment of the present application, the gun body 110 is injection molded. According to one embodiment of the present application, the material of the gun body 110 is a metal or alloy such as aluminum, stainless steel, etc.

As shown, in the gun body 110, the fuel nozzle 100 includes a valve assembly 120, a driving mechanism 130, a vacuum cap 140, and a barrel assembly 150, which are sequentially disposed from the fuel inlet 101 to the fuel outlet 102. The valve assembly 120 functions to allow or prevent oil from passing through the gun body 110 and to allow or block oil vapor recovery. The driving mechanism 130 is used for controlling the valve assembly 120, and controlling the on/off of the valve assembly 120, so as to control the passing of oil and/or oil vapor. The vacuum cap 140 is used to lock the drive mechanism 130 so that the drive mechanism 130 is in a usable state. A barrel assembly 150 is provided at the outlet port 102 of the gun body 110, which may be inserted into a vehicle's fuel tank to add oil thereto. In some embodiments, the gun body 110 further includes a plurality of chambers, with the valve assembly 120, the drive mechanism 130, and the vacuum cap 140 each being received in their respective chambers. For example: valve assembly 120 can be received in a valve assembly cavity of gun body 110; the drive mechanism 130 may be housed in a drive mechanism cavity of the gun body 110; the vacuum cap 140 may be received in a vacuum cap cavity of the gun body 110 and the barrel assembly 150 may be received in a barrel assembly cavity of the gun body 110.

As shown, the fuel gun 100 also includes a trigger assembly 160 located outside the gun body 110 and coupled to the drive mechanism 130 via a transition piece 161 that can be used to drive the axial movement of the drive shaft in the drive mechanism 130. For example, pulling the trigger assembly 160 can push the drive mechanism 130, thereby controlling the valve assembly 120. In some embodiments, the transition piece 161 is also located on the outside of the gun body, with one end connected to the gun body 110 and the other end connected to the trigger 162. Further, the gun body 110 includes an opening 103 at a location corresponding to the drive mechanism cavity. The transition piece 161 enters the drive mechanism cavity through the opening 103 and is connected to the drive mechanism 130.

In some embodiments, a liquid passage 104 and a gas passage 105 are included between the valve assembly chamber and the barrel assembly chamber of the gun body 110; the oil passage 104 can be used for oil to enter the vehicle oil tank from the oil inlet 101 through the gun body 110; the gas passage 105 may be used for recovery of oil vapor through the gun body 110 into the fuel dispenser. In some embodiments, the fluid passage 104 protrudes from the gun body at a portion corresponding to the drive mechanism chamber to compensate for an oil flow path occupied by the drive mechanism chamber and avoid forming an overflow area bottleneck to lose oil energy.

In some embodiments, the valve assembly cavity and the vacuum cap cavity of the gun body 110 may further include an oil pressure passage 106 and a gas pressure passage 107; the oil pressure channel 106 is used for pushing the vacuum cap 140 to lock the driving mechanism 130 by using the pressure generated by the oil; the air pressure channel 107 uses the vacuum assembly to create a vacuum to draw air from the vacuum cap such that the vacuum cap is disengaged from the drive mechanism 130 (i.e., unlocked) such that the drive mechanism 130 is no longer available.

According to one embodiment of the application, the work flow of the oil gun is as follows: after oil enters the communicating valve assembly cavity through the oil inlet 101, the oil enters the vacuum cap 140 through the oil pressure passage 106. The vacuum cap 140 pushes the gear pin into the recess of the drive mechanism 130 under the action of oil pressure, so that the drive mechanism 130 is in a usable state. At this time, if the trigger 162 is pulled, the driving mechanism 130 may push the valve assembly 120 such that the oil and gas path valves of the valve assembly 120 are opened. When the oil pressure is removed, the vacuum cap 140 loses pressure, lifting the catch pin from the drive mechanism 130, the drive mechanism 130 is no longer available, and the gun is turned off. Alternatively, when the oil in the oil tank is over the outlet of the barrel assembly 150, the air pressure channel 107 is isolated from the environment and begins to draw air from the vacuum cap, thereby lifting the gear pin off the drive mechanism 130, the drive mechanism 130 is no longer available and the gun is shut off.

Fig. 3 is an exploded view of a drive mechanism according to an embodiment of the present invention. Fig. 4 is a front view of a drive mechanism according to an embodiment of the present invention. Fig. 5 is a cross-sectional view of a drive mechanism according to an embodiment of the present invention. As shown, the drive mechanism 130 includes a fixed hub 310, a drive hub 320, and a drive shaft 330. Wherein, the driving shaft sleeve 320 is arranged in the fixed shaft sleeve 310 and can horizontally slide along the fixed shaft sleeve 310; the driving shaft 330 is disposed in the driving boss 320 to be horizontally slidable along the driving boss 320; a three-layer laminated sliding structure is formed. Further, the sliding distance of the driving shaft 330 in the driving boss 320 is greater than the sliding distance of the driving boss 320 disposed in the fixed boss 310. In response to the drive shaft being fitted in the drive bushing, the drive bushing being fitted in the fixed bushing; when the driving shaft is unlocked with the driving shaft sleeve, the driving shaft can move relatively along the axial direction of the driving shaft sleeve. Thus, as the drive shaft 330 slides within the drive hub 320, the relationship of the drive hub 320 and the fixed hub 310 may still be relatively stationary.

The gear pin from the vacuum cap 140 can lock the drive shaft 330 and the drive sleeve 320 together. Thus, when the drive shaft 330 slides in the drive sleeve 320 at the time of locking, the drive sleeve 320 also slides with respect to the fixed sleeve 310. When unlocked, the drive hub 320 does not slide relative to the fixed hub 310 as the drive shaft 330 slides within the drive hub 320.

The drive shaft 330 is connected to the trigger 162 through the transition piece 161. The drive shaft 330 is able to slide horizontally when the trigger 162 is pulled. The drive sleeve 320 is connected to the valve assembly 120. The horizontal sliding of the drive sleeve 320 enables actuation of the valve assembly. Thereby, the oil fill control function of the drive mechanism 130 is realized.

According to an embodiment of the present invention, the drive shaft 330 includes a dry measuring hole. The fixed sleeve 310 and the driving sleeve 320 respectively include a first opening and a second opening exposing the dry measuring hole of the driving shaft 330, wherein the first opening is an opening for a connection portion of the trigger assembly and the driving shaft; the second opening is an opening corresponding to the dry-test hole position. The dry test hole is adapted to receive a locking member through the first opening of the fixed boss 310 and the second opening of the drive boss 320. When the locking member is received in the dry test hole of the drive shaft 330, the locking member locks the drive shaft 330 and the drive sleeve 320, and the trigger assembly drives the drive mechanism to open the valve assembly; when the drive shaft and drive sleeve are unlocked, the trigger assembly drives the drive shaft in the drive mechanism to move axially relative to the drive sleeve and the valve assembly remains closed. In other words, in addition to the catch pin of the vacuum cap 140, another locking mechanism operable from outside the gun body 110 of the oil gun to lock the drive shaft 330 and the drive sleeve 320 together is included between them. Thus, the drive shaft 330 and the drive boss 320 can be locked without the need for the oil pressure to drive the gear engaging pin of the vacuum cap 140, and the valve assembly 120 can be opened by pulling the trigger 162, thereby performing dry testing without oil.

In some embodiments, the first opening of the fixed sleeve 310 is the opening 103 for connecting the converting element 161 and the driving shaft 330. Thus, there is no need to include additional openings in the fixed boss 310. In some embodiments, the second opening of the drive sleeve 320 is an opening of the same location and size as the dry test hole, thereby achieving a lock between the two. In some embodiments, a return spring 360 is included between the drive shaft 330 and the drive hub 320 to return the drive shaft 330 to an end away from the drive hub 320. The second opening of the driving bushing 320 is a U-shaped slot 321. When the driving shaft 330 is returned to a position away from one end of the driving boss 320 by the return spring, the locking member received in the dry measurement hole is also received in the U-shaped groove 321. Thus, when the drive shaft 330 is slid horizontally by the trigger 162, the locking member also pushes the U-shaped slot 321 so that the drive sleeve 320 is also slid horizontally, achieving the previous locking of the two.

In some embodiments, the fixed hub 310 is a circular hub that can receive the drive hub 320. In some embodiments, the head of the fixing sleeve 310 is designed to be conical, which not only reduces the space occupied inside the fuel gun body, facilitates the arrangement of a gas or liquid passage above the fuel gun body, but also facilitates the installation.

In some embodiments, the first opening of the fixed sleeve 310 is a kidney-shaped hole 311 extending from both sides of the head of the fixed sleeve 310 to the middle. The kidney-shaped aperture 311 may receive either a portion of the transition piece 161 through the connection to the drive shaft 330 or a locking member through the connection to the drive shaft 330. In other words, for the driving mechanism including the dry test function of the present invention, an additional opening on the fixed sleeve 310 may not be required, so that the cost can be saved.

In some embodiments, the fixed bushing 310 is provided with a first recess 312 in the middle for receiving a catch pin holder on the vacuum cap 140. The length of the first recess 312 is greater than or equal to the length of the shift peg seat. In some implementations, the head of the fixed sleeve 310 is provided with a spiral groove 314. Screws can be used to secure the fixed sleeve to the gun body drive mechanism cavity via helical grooves 314 to prevent movement of the fixed sleeve 310.

In some embodiments, the outer side of the tail portion of the fixed shaft sleeve 310 is provided with a first sealing groove 313 for installing a first sealing ring 340. The diameter of the first sealing groove 313 is greater than or equal to the diameter of the first sealing ring 340, so that an interference fit effect is achieved. The inner side of the rear portion of the fixed sleeve 310 is provided with a second sealing groove (not shown) for installing a second sealing ring 350. By installing the first sealing ring 340 and the second sealing ring 350 at the tail part of the fixed shaft sleeve 310, oil inside the fuel gun body can be effectively prevented from entering the driving mechanism or the driving mechanism cavity. The first seal ring 340 and the second seal ring 350 may each be standard seals.

In some embodiments, the second opening of the driving sleeve 320 is a U-shaped slot 321 disposed at the head of the driving sleeve 320. The width of the U-shaped slot is greater than or equal to the width of the kidney-shaped hole 311. The driving bushing 320 is provided with a second recess 322 in the middle for receiving a shift pin of the shift pin holder. In some embodiments, the rear portion of the driving sleeve 320 is provided with a force-receiving shaft 323 having a slightly smaller diameter. The force-bearing shaft 323 interfaces with the valve assembly 120 and is cut out of two planar sides to facilitate proper installation of the drive sleeve 320. In some embodiments, the drive hub 320 further includes a return spring 360 that fits between the drive shaft and the drive hub. The return spring 360 is compressed and returns the drive shaft 331 to a position away from the drive sleeve 320.

In some embodiments, the drive shaft 330 is a cylindrical shaft body that fits within the drive hub 320. The driving shaft 330 has a third groove 332 formed at the rear thereof, and the length of the third groove is greater than that of the second groove 322, for accommodating one or more catch pins. In some embodiments, the drive shaft 330 head is provided with a dry measuring hole 331. In some embodiments, dry test hole 331 may be a through hole. When the driving mechanism 130 is assembled, the dry measuring hole 331 is overlapped with the U-shaped slot 321 and the waist-shaped hole 311. In some embodiments, the drive shaft includes a lock adapted to receive access from outside the fuel nozzle. A locking member, such as a pin, is adapted to be received in the dry-side aperture 331 from outside the gun through the kidney-shaped aperture 311 and the U-shaped slot 321. Even if the fuel gun does not hydraulically drive the catch pin, the drive shaft 331 can be horizontally moved in the axial direction when the trigger 162 is pulled.

The dry testing function is only one of a plurality of tests before the oil gun leaves a factory, and does not belong to items to be tested frequently. The utility model discloses a scheme is through increasing the oilless locking that does the survey hole realization drive shaft and drive shaft sleeve futilely in the drive shaft, can make the oil gun have oil vapor recovery's dry survey function under the condition of as far as reduce cost, convenient to use is convenient for maintain moreover.

For ease of manufacture, the drive shaft is often designed to be generally cylindrical in shape. In some embodiments, the drive shaft is prevented from rotating and the dry test holes are prevented from being misaligned by adding a positioning member.

Fig. 6 is a bottom exploded view of a drive mechanism according to an embodiment of the present invention. Fig. 7 is a bottom view of a drive mechanism according to an embodiment of the present invention. As shown, the bottom of the fixed sleeve 310 is provided with a first strip hole 315, the length of which is greater than or equal to the moving length of the driving shaft. The bottom of the driving sleeve 320 is provided with a second bar-shaped hole 324, the length and width of which are slightly larger than the first bar-shaped hole 315, for example, 0.5-2mm more. The bottom of the drive shaft 330 is provided with a locating hole, such as a blind hole 333, for receiving a locating member, such as a screw 370. The positioning piece is suitable for being contained in the positioning hole, the first strip-shaped hole and the second strip-shaped hole. In some embodiments, the inner wall of the blind hole 333 is provided with threads, and the threads on the set screw 370 and the threads in the blind hole are self-locked by friction force to facilitate installation.

As shown, the driving boss 320 and the driving shaft 330 are fitted in the fixed boss 310, and the first elongated hole 315 is overlapped with the second elongated hole 324. Exposed portions of the set screws 370 secured in the blind holes 333 are received in the first and second elongated holes 315, 324. Therefore, only one positioning screw 370 is needed to realize circumferential positioning of the driving shaft sleeve 320, the driving shaft 330 and the fixed shaft sleeve 310, and the driving shaft sleeve 320 and the driving shaft 330 can be effectively prevented from spinning.

Fig. 8 is a schematic diagram of a dry gas-liquid recovery ratio of a fuel nozzle according to an embodiment of the present invention. As shown, the oil gas recovery system includes a gas-liquid ratio control motherboard 810, an oil gas recovery pump 820, and an oil gas recovery fueling gun 830. Other instruments need to be used in the dry survey of oil gun include: gas-liquid ratio adapter 840, gas flow meter 850, and test terminal 860. Gas-to-liquid ratio adapter 840 can connect the port of the fuel gun to gas flow meter 850 via a hose. Different fuel guns adapt to different types of gas-liquid ratio adapters. The gas flow meter 850 measures the volume of the recovered gas and has a function of identifying the flow direction of the gas. The test terminals 860 are used to obtain a simulated fuel volume of the fuel dispenser and a volume flowing through the gas flow meter.

As shown, the inlet port of the fueling gun 830 is connected to the fuel dispenser's vapor recovery pump 820 via a hose. The gas-liquid adapter 840 is installed at the oil-gas collecting hole of the fuel nozzle 830. The air inlet hole of the gas-liquid adapter 840 is connected with the air outlet hole of the gas flowmeter 850 through an air duct. The other side of the gas flowmeter 850 is provided with an air inlet hole. The encoder of the gas flow meter 850 is electrically connected to the test terminal 860. And the gas-liquid ratio control main board 810 on the oiling machine is electrically connected with the detection terminal.

Fig. 9 is a flowchart of a method for detecting a gas-liquid recovery ratio by dry measurement according to an embodiment of the present invention.

In step 910, when the dry gas-liquid recovery ratio is measured, the refueling pump is kept in a closed state, and only the oil-gas recovery system of the refueling machine is kept working.

At step 920, a locating element is received in the dry-test well. Thus, the driving mechanism of the fuel gun can be driven by pulling the trigger even when the fuel does not flow out.

At step 930, the operator pulls the trigger assembly and the vapor recovery pump begins to operate to simulate the gun out for vapor recovery.

At step 940, at intervals, the operator stops pulling the trigger, and the detection device calculates the oil-gas recovery ratio by calculating the obtained simulated oil production volume and the recovered gas volume.

In some embodiments, in order to ensure the detection accuracy, the simulated oil amount is more than 50L within the detection time, and the accuracy of the gas flowmeter is not less than +/-2%. Gas to liquid ratios of 100% to 120% are generally considered acceptable. If the gas-liquid ratio is not in the range of the standard limit value any more and the difference between the gas-liquid ratio detection value and the limit value is less than or equal to 10%, then 2 times of gas-liquid ratio detection can be carried out, and the arithmetic mean can be carried out on the 3 times of detection results. And if the gas-liquid ratio average value is within the given limit range, the gas-liquid ratio detection of the oil filling gun reaches the standard, otherwise, the gas-liquid ratio detection of the oil filling gun does not reach the standard.

The above embodiments are provided only for the purpose of illustration, and are not intended to limit the present invention, and those skilled in the relevant art can make various changes and modifications without departing from the scope of the present invention, and therefore, all equivalent technical solutions should also belong to the scope of the present invention.

Claims (12)

1. The utility model provides a nozzle actuating mechanism of function is surveyed futilely in area which characterized in that includes:

a fixed bushing including a first opening;

a drive bushing including a second opening; and

the driving shaft is provided with a dry measuring hole;

wherein the dry test hole is adapted to receive a lock from outside the fuel filler gun through the first and second openings; wherein when the locking member is received in the dry measuring hole, the driving shaft and the driving boss are locked.

2. The drive mechanism as recited in claim 1, wherein the drive shaft is fitted in the drive bushing, the drive bushing being fitted in the fixed bushing; wherein the drive shaft is capable of relative axial movement along the drive sleeve when the drive shaft is unlocked from the drive sleeve.

3. The drive mechanism as recited in claim 1, wherein the first opening is an opening for a portion of a trigger assembly that is coupled to the drive shaft.

4. The drive mechanism as recited in claim 1, wherein the first opening is a kidney-shaped hole extending from both sides to a middle portion of the head portion of the fixed sleeve.

5. The drive mechanism as recited in claim 4, wherein the fixed sleeve head is tapered.

6. The drive mechanism as recited in claim 1, wherein the second opening is an aperture corresponding to the dry-test hole location.

7. The drive mechanism as recited in claim 1, further comprising a return spring fitted between the drive shaft and the drive sleeve.

8. The drive mechanism as recited in claim 7, wherein the second opening is a U-shaped slot; the locking member received in the dry measuring hole is also adapted to be received in the U-shaped groove when the return spring returns the drive shaft to a position away from the drive boss.

9. The drive mechanism as recited in claim 1, wherein the fixed collar includes a first elongated aperture; the driving shaft sleeve comprises a second strip-shaped hole, and the driving shaft comprises a positioning hole; the positioning piece is suitable for being contained in the positioning hole, the first strip-shaped hole and the second strip-shaped hole.

10. A fuel gun, comprising:

a gun body;

a valve assembly configured to allow or block oil and gas from passing through the gun body;

the drive mechanism of any of claims 1-9, configured to control a valve assembly; and

a trigger assembly configured to drive axial movement of a drive shaft in the drive mechanism of any of claims 1-9.

11. The fuel nozzle as claimed in claim 10, wherein the drive shaft and the drive boss are locked when the locking member is received in the dry test hole, and the trigger assembly actuates the drive mechanism of any one of claims 1 to 9 to open the valve assembly.

12. The fuel gun of claim 10, wherein when the drive shaft and the drive sleeve are unlocked, the trigger assembly actuates the drive mechanism of any one of claims 1-9 with the drive shaft axially relative to the drive sleeve, and the valve assembly remains closed.

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