A fueling gun driving mechanism with dry-test function and a fueling gun

Abstract

The present invention relates to a driving mechanism of a refueling gun, comprising: a fixed sleeve including a first opening; a driving sleeve including a second opening; and a driving shaft on which a dry measuring hole is provided; wherein the dry measuring hole is suitable for accommodating a locking member that enters from the outside of the refueling gun through the first opening and the second opening; wherein, when the locking member is accommodated in the dry measuring hole, the driving shaft and the driving sleeve are locked. The present invention provides a U-shaped groove on the head of the driving sleeve and a dry measuring hole on the driving shaft, so that the refueling gun can detect the oil and gas recovery ratio even when no oil is discharged. Compared with the wet detection of the oil and gas recovery ratio, the dry detection of the oil and gas recovery ratio greatly simplifies the detection process, does not reduce the quality of the oil product, and avoids harm to the human body and environmental pollution.

Description

Technical Field

[0001] The present invention relates to the field of refueling equipment, and in particular to a refueling gun driving mechanism with a dry-test function and a refueling gun. Background Art

[0002] A fuel nozzle is the output terminal of a gas station's fuel dispenser, used to add gasoline and other substances to a vehicle's fuel tank. Currently, most fuel nozzles have a vapor recovery function. This function recycles the volatile vapors generated during refueling back into the fuel storage system, thereby reducing environmental pollution and resource waste.

[0003] Different countries and regions have different standards for the gas-liquid recovery ratio of fueling systems. For example, the gas-liquid recovery ratio of typical fuel nozzles ranges from 100% to 120%. Therefore, fuel nozzles must be tested for compliance with relevant standards before leaving the factory. The traditional testing method uses a wet test method, which involves connecting the nozzle to a fuel dispenser, measuring the volume of discharged oil and the volume of recovered gas, and finally calculating the gas-liquid recovery ratio. The wet test method is cumbersome and, because the discharged oil is recirculated, it may degrade the oil quality. Therefore, there is an urgent need for an alternative method to the wet test method. Summary of the Invention

[0004] In response to the technical problems existing in the prior art, the present invention proposes a driving mechanism for a fuel gun, comprising: a fixed sleeve including a first opening; a driving sleeve including a second opening; and a driving shaft on which a dry measuring hole is provided; wherein the dry measuring hole is suitable for accommodating a locking member that enters from the outside of the fuel gun through the first opening and the second opening; wherein, when the locking member is accommodated in the dry measuring hole, the driving shaft and the driving sleeve are locked.

[0005] In the driving mechanism as described above, the driving shaft is assembled in the driving sleeve, and the driving sleeve is assembled in the fixed sleeve; when the driving shaft and the driving sleeve are not locked, the driving shaft can move relative to the driving sleeve axially.

[0006] In the driving mechanism as described above, the first opening is an opening for the connection portion between the trigger assembly and the driving shaft.

[0007] In the driving mechanism as described above, the first opening is a waist-shaped hole extending from both sides of the head of the fixed sleeve to the middle.

[0008] In the driving mechanism as described above, the head of the fixed sleeve is conical.

[0009] In the driving mechanism as described above, the second opening is an opening corresponding to the position of the dry measuring hole.

[0010] The driving mechanism as described above further comprises a return spring assembled between the driving shaft and the driving sleeve.

[0011] In the driving mechanism as described above, the second opening is a U-shaped groove; when the reset spring resets the driving shaft to a position away from the driving sleeve, the locking member accommodated in the measuring hole is also adapted to be accommodated in the U-shaped groove.

[0012] In the driving mechanism as described above, the fixed sleeve includes a first strip hole; the driving sleeve includes a second strip hole; the driving shaft includes a positioning hole; and the positioning member is suitable for being accommodated in the positioning hole, the first strip hole and the second strip hole.

[0013] According to another aspect of the present invention, a refueling gun is provided, comprising: a gun body; a valve assembly configured to allow or block oil and oil 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.

[0014] In the fuel gun as described above, when the locking member is accommodated in the dry hole, the drive shaft and the drive shaft sleeve are locked, and the trigger assembly drives the drive mechanism to open the valve assembly.

[0015] In the fuel gun as described above, when the drive shaft and the 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.

[0016] According to another aspect of the present invention, a dry-test method for oil and gas recovery of a fuel pump is proposed, comprising: keeping the fuel pump in a closed state; accommodating a locking member in a dry-test hole of a drive shaft of the fuel pump; pulling a trigger assembly to simulate oil discharge from the fuel pump and recover oil and gas; and obtaining the simulated oil discharge volume and the recovered gas volume at intervals to calculate the oil and gas recovery ratio.

[0017] By providing a U-shaped groove in the drive sleeve head and a dry-test hole on the drive shaft, this invention allows the fuel nozzle to detect the oil vapor recovery ratio even when no fuel is being pumped out. Compared to wet-testing, dry-testing significantly simplifies the testing process without compromising fuel quality, preventing harm to the human body and environmental pollution. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Below, the preferred embodiments of the present invention will be further described in detail with reference to the accompanying drawings, in which:

[0019] Figure 1 is a perspective view of a fuel gun according to one embodiment of the present invention;

[0020] Figure 2 is a schematic cross-sectional view of a fueling gun according to one embodiment of the present invention;

[0021] Figure 3is an exploded view of a driving mechanism according to one embodiment of the present invention;

[0022] Figure 4 is a front view of a driving mechanism according to one embodiment of the present invention;

[0023] Figure 5 is a cross-sectional view of a driving mechanism according to one embodiment of the present invention;

[0024] Figure 6 is an exploded bottom view of a driving mechanism according to one embodiment of the present invention;

[0025] Figure 7 is a bottom view of a driving mechanism according to one embodiment of the present invention;

[0026] Figure 8 is a schematic diagram of the dry gas-liquid recovery ratio of a refueling gun according to one embodiment of the present invention; and

[0027] Figure 9 The present invention is a flowchart of a method for detecting the gas-liquid recovery ratio using a dry detection method according to an embodiment of the present invention. DETAILED DESCRIPTION

[0028] To make the objectives, technical solutions, and advantages of the embodiments of the present invention more clear, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts shall fall within the scope of protection of the present invention.

[0029] In the detailed description that follows, reference may be made to the various drawings that form part of this application and illustrate specific embodiments of the present application. In the drawings, similar reference numerals describe substantially similar components in different figures. Each specific embodiment of the present application is described below in sufficient detail to enable a person of ordinary skill in the art to implement the technical solutions of the present application. It should be understood that other embodiments may be utilized or that structural, logical, or electrical changes may be made to the embodiments of the present application.

[0030] To address this issue, the present invention incorporates a dry-test hole in the fueling gun's drive mechanism. To test the gas-liquid recovery ratio, simply insert a locking element into the dry-test hole. At this point, pulling the fueling gun's trigger activates the gas recovery hole, but no oil will flow from the oil outlet. This replaces the wet-test method, eliminating the need for actual oil delivery, streamlining the testing process and saving testing time.

[0031] Figure 12 is a perspective view of a fuel gun according to one embodiment of the present invention. Figure 2 : is a cross-sectional schematic diagram of a refueling gun according to an embodiment of the present invention. As shown in the figure, the refueling gun 100 includes a gun body 110, which includes an oil inlet 101 and an oil outlet 102, wherein the oil inlet 101 includes an inlet thread, which can be connected to a hose and then connected to a refueling pump. According to one embodiment of the present application, the inlet thread is M34×1.5. The oil from the refueling pump 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 and stainless steel.

[0032] As shown in the figure, within the gun body 110, the fueling gun 100 includes a valve assembly 120, a drive mechanism 130, a vacuum cap 140, and a barrel assembly 150, arranged sequentially from the fuel inlet 101 to the fuel outlet 102. The valve assembly 120 is used to allow or prevent fuel from passing through the gun body 110 and to allow or block the recovery of fuel vapor. The drive mechanism 130 is used to control the valve assembly 120, controlling its on and off state, thereby controlling the passage of fuel and / or fuel vapor. The vacuum cap 140 is used to lock the drive mechanism 130, ensuring that it is in a usable state. The barrel assembly 150 is located at the fuel outlet 102 of the gun body 110 and can be inserted into a vehicle's fuel tank to add fuel. In some embodiments, the gun body 110 further includes multiple chambers, each housing the valve assembly 120, the drive mechanism 130, and the vacuum cap 140. For example, the valve assembly 120 may be housed in the valve assembly cavity of the gun body 110 ; the drive mechanism 130 may be housed in the drive mechanism cavity of the gun body 110 ; the vacuum cap 140 may be housed in the vacuum cap cavity of the gun body 110 ; and the barrel assembly 150 may be housed in the barrel assembly cavity of the gun body 110 .

[0033] As shown, the fueling gun 100 also includes a trigger assembly 160 located outside the gun body 110. This trigger assembly 160 is connected to the drive mechanism 130 via a converter 161 and can be used to drive the drive shaft in the drive mechanism 130 to axially move. For example, pulling the trigger assembly 160 can advance the drive mechanism 130, thereby controlling the valve assembly 120. In some embodiments, the converter 161 is also located outside the gun body, with one end connected to the gun body 110 and the other end connected to the trigger 162. Furthermore, the gun body 110 includes an opening 103 at a location corresponding to the drive mechanism cavity. The converter 161 enters the drive mechanism cavity through the opening 103 and is then connected to the drive mechanism 130.

[0034] In some embodiments, a liquid passage 104 and a gas passage 105 are provided between the valve assembly chamber and the barrel assembly chamber of the gun body 110. The liquid passage 104 allows oil to flow from the oil inlet 101 through the gun body 110 into the vehicle's fuel tank, while the gas passage 105 allows oil vapor to flow through the gun body 110 and be recovered by the fuel dispenser. In some embodiments, the portion of the liquid passage 104 corresponding to the drive mechanism chamber protrudes outward from the gun body to compensate for the oil flow path occupied by the drive mechanism chamber, avoiding the formation of a flow bottleneck and the loss of oil energy.

[0035] In some embodiments, the valve assembly cavity and the vacuum cap cavity of the gun body 110 may also include an oil pressure channel 106 and an air pressure channel 107; wherein the oil pressure channel 106 is used to use the pressure generated by the oil to push the vacuum cap 140 to lock the drive mechanism 130; the air pressure channel 107 uses the vacuum assembly to generate vacuum to extract the air in the vacuum cap, so that the vacuum cap is separated from the drive mechanism 130 (i.e., unlocked state), so that the drive mechanism 130 is no longer available.

[0036] According to one embodiment of the present application, the fuel pump operates as follows: After oil enters the connecting valve assembly cavity through the oil inlet 101, it flows through the oil pressure channel 106 and into the vacuum cap 140. Under the action of the oil pressure, the vacuum cap 140 pushes the shift pin into the groove of the drive mechanism 130, making the drive mechanism 130 usable. At this point, if the trigger 162 is pulled, the drive mechanism 130 can push the valve assembly 120, opening the oil and air valves of the valve assembly 120. When the oil pressure is removed, the vacuum cap 140 loses pressure, lifting the shift pin from the drive mechanism 130, rendering the drive mechanism 130 inoperable and shutting down the fuel pump. Alternatively, when the oil in the fuel tank covers the oil outlet of the barrel assembly 150, the air pressure channel 107 is isolated from the outside world, and air in the vacuum cap begins to be extracted, thereby lifting the shift pin from the drive mechanism 130, rendering the drive mechanism 130 inoperable and shutting down the fuel pump.

[0037] Figure 3 FIG. 1 is an exploded view of a driving mechanism according to an embodiment of the present invention. Figure 4 2 is a front view of a driving mechanism according to an embodiment of the present invention. Figure 5is a cross-sectional view of a drive mechanism according to one embodiment of the present invention. As shown, the drive mechanism 130 includes a fixed sleeve 310, a drive sleeve 320, and a drive shaft 330. The drive sleeve 320 is disposed within the fixed sleeve 310 and can slide horizontally along the fixed sleeve 310; the drive shaft 330 is disposed within the drive sleeve 320 and can slide horizontally along the drive sleeve 320, forming a three-layer stacked sliding structure. Furthermore, the sliding distance of the drive shaft 330 within the drive sleeve 320 is greater than the sliding distance of the drive sleeve 320 within the fixed sleeve 310. In response to the drive shaft being assembled within the drive sleeve, the drive sleeve is assembled within the fixed sleeve; when the drive shaft and the drive sleeve are unlocked, the drive shaft can move relative to each other along the axial direction of the drive sleeve. Thus, while the drive shaft 330 slides within the drive sleeve 320, the drive sleeve 320 and the fixed sleeve 310 can still remain relatively stationary.

[0038] The locking pin from the vacuum cap 140 can lock the drive shaft 330 and the drive sleeve 320 together. Therefore, when the drive shaft 330 slides in the drive sleeve 320 in the locked state, the drive sleeve 320 also slides relative to the fixed sleeve 310. When the drive shaft 330 slides in the drive sleeve 320 in the unlocked state, the drive sleeve 320 does not slide relative to the fixed sleeve 310.

[0039] Drive shaft 330 is connected to trigger 162 via conversion element 161. When trigger 162 is pulled, drive shaft 330 slides horizontally. Drive sleeve 320 is connected to valve assembly 120. This horizontal sliding motion of drive sleeve 320 actuates the valve assembly, thereby enabling drive mechanism 130 to control oil filling.

[0040] According to one embodiment of the present invention, the drive shaft 330 includes a dry-test hole. The fixed sleeve 310 and the drive sleeve 320 each include a first opening and a second opening, exposing the dry-test hole of the drive shaft 330. The first opening is for the connection between the trigger assembly and the drive shaft, while the second opening corresponds to the position of the dry-test hole. The dry-test hole is adapted to receive a locking member that passes through the first opening of the fixed sleeve 310 and the second opening of the drive sleeve 320. When the locking member is received in the dry-test hole of the drive shaft 330, it locks the drive shaft 330 and the drive sleeve 320, allowing the trigger assembly to actuate 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 axially move relative to the drive sleeve, keeping the valve assembly closed. In other words, in addition to the shift pin on the vacuum cap 140, a locking mechanism is provided between the drive shaft 330 and the drive sleeve 320, which can be operated from outside the oil gun body 110 to lock the two together. In this way, the drive shaft 330 and the drive sleeve 320 can be locked without the need for oil pressure to drive the gear pin of the vacuum cap 140, so that the valve assembly 120 can be opened by pulling the trigger 162 to implement dry testing without oil.

[0041] In some embodiments, the first opening of the fixed sleeve 310 serves as the opening 103 for connecting the conversion member 161 to the drive shaft 330. This eliminates the need for an additional opening on the fixed sleeve 310. In some embodiments, the second opening of the drive sleeve 320 is an opening with the same position and size as the stem hole, thereby achieving locking between the two. In some embodiments, a return spring 360 is provided between the drive shaft 330 and the drive sleeve 320 to return the drive shaft 330 to an end away from the drive sleeve 320. The second opening of the drive sleeve 320 is a U-shaped groove 321. When the return spring returns the drive shaft 330 to a position away from the drive sleeve 320, the locking member received in the stem hole is also received in the U-shaped groove 321. Consequently, when the drive shaft 330 slides horizontally under the action of the trigger 162, the locking member pushes against the U-shaped groove 321, causing the drive sleeve 320 to slide horizontally as well, achieving locking between the two.

[0042] In some embodiments, the fixed sleeve 310 is a circular sleeve that can accommodate the drive sleeve 320. In some embodiments, the head of the fixed sleeve 310 is designed to be conical, which can reduce the internal space occupied by the fuel gun body, facilitate the installation of gas or liquid passages on the top, and facilitate installation.

[0043] In some embodiments, the first opening of the fixed sleeve 310 is a waist-shaped hole 311 extending from both sides of the head of the fixed sleeve 310 to the middle. This waist-shaped hole 311 accommodates both a portion of the conversion member 161 passing through to connect to the drive shaft 330 and a locking member passing through to connect to the drive shaft 330. In other words, the drive mechanism of the present invention, including the dry-test function, does not require an additional opening in the fixed sleeve 310, thereby saving costs.

[0044] In some embodiments, a first groove 312 is provided in the middle of the fixed sleeve 310 to accommodate the gear engaging pin seat on the vacuum cap 140. The length of the first groove 312 is greater than or equal to the length of the gear engaging pin seat. In some implementations, a spiral groove 314 is provided at the top of the fixed sleeve 310. The spiral groove 314 allows the fixed sleeve 310 to be secured to the drive mechanism cavity of the gun body using a screw, preventing the fixed sleeve 310 from moving.

[0045] In some embodiments, a first sealing groove 313 is provided on the outside of the rear end of the fixed sleeve 310 for mounting 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, thereby achieving an interference fit. A second sealing groove (not shown) is provided on the inside of the rear end of the fixed sleeve 310 for mounting a second sealing ring 350. By mounting the first and second sealing rings 340, 350 on the rear end of the fixed sleeve 310, oil from the fueling gun body can be effectively prevented from entering the drive mechanism or the drive mechanism cavity. Both the first and second sealing rings 340, 350 can be standard seals.

[0046] In some embodiments, the second opening of the drive sleeve 320 is a U-shaped groove 321, which is provided at the head position of the drive sleeve 320. The width of the U-shaped groove is greater than or equal to the width of the waist-shaped hole 311. A second groove 322 is provided in the middle of the drive sleeve 320, which is used to accommodate the gear pin on the gear pin seat. In some embodiments, a force-bearing shaft 323 with a diameter slightly smaller than the gear pin is provided at the tail of the drive sleeve 320. The force-bearing shaft 323 is docked with the valve assembly 120, and its two sides are cut into two planes to facilitate the correct installation of the drive sleeve 320. In some embodiments, the drive sleeve 320 also includes a return spring 360, which is assembled between the drive shaft and the drive sleeve. The return spring 360 is in a compressed state, which can restore the drive shaft 331 to a position away from the drive sleeve 320.

[0047] In some embodiments, the drive shaft 330 is a cylindrical shaft body, which is assembled in the drive shaft sleeve 320. A third groove 332 is provided at the tail of the drive shaft 330, and its length is greater than that of the second groove 322, which is used to accommodate one or more gear pins. In some embodiments, a dry measuring hole 331 is provided at the head of the drive shaft 330. In some embodiments, the dry measuring hole 331 can be a through hole. When the drive mechanism 130 is assembled, the dry measuring hole 331 coincides with the position of the U-shaped groove 321 and the waist-shaped hole 311. In some embodiments, the drive shaft includes a locking member suitable for accommodating entry from the outside of the fuel gun. The locking member, such as a pin, is suitable for passing through the waist-shaped hole 311 and the U-shaped groove 321 from the outside of the fuel gun and being accommodated in the dry measuring hole 331. Even if the fuel gun does not have an oil pressure-driven gear pin, when the trigger 162 is pulled, the drive shaft 331 can be made to move horizontally axially.

[0048] Since the dry-test function is only one of the multiple tests that the oil gun undergoes before leaving the factory and is not a frequently tested item, the solution of the present invention achieves oil-free locking of the drive shaft and drive shaft sleeve by adding a dry-test hole on the drive shaft. This can provide the oil gun with a dry-test function for oil vapor recovery while minimizing costs, and is easy to use and maintain.

[0049] For the convenience of processing, the drive shaft is often designed into a substantially cylindrical shape. In some embodiments, a positioning member is added to prevent the drive shaft from rotating and causing the dry hole to be unable to align.

[0050] Figure 6 1 is an exploded bottom view of a driving mechanism according to an embodiment of the present invention. Figure 7 : It is a bottom view of the driving mechanism according to an embodiment of the present invention. As shown in the figure, a first strip hole 315 is provided at the bottom of the fixed sleeve 310, and its length is greater than or equal to the length of the movement of the driving shaft. A second strip hole 324 is provided at the bottom of the driving sleeve 320, and its length and width are slightly larger than the first strip hole 315, for example, 0.5-2 mm more. A positioning hole, such as a blind hole 333, is provided at the bottom of the driving shaft 330 for accommodating a positioning member, such as a screw 370. The positioning member is suitable for being accommodated in the positioning hole, the first strip hole and the second strip hole. In some embodiments, a thread is provided on the inner wall of the blind hole 333, and the thread on the positioning screw 370 and the thread in the blind hole are self-locked by friction to facilitate installation.

[0051] As shown, the drive sleeve 320 and drive shaft 330 are assembled in the fixed sleeve 310, with the first strip-shaped hole 315 and the second strip-shaped hole 324 overlapping. The exposed portion of the positioning screw 370, fixed in the blind hole 333, is received in the first strip-shaped hole 315 and the second strip-shaped hole 324. Thus, a single positioning screw 370 is used to circumferentially position the drive sleeve 320 and drive shaft 330 relative to the fixed sleeve 310, effectively preventing the drive sleeve 320 and drive shaft 330 from spinning.

[0052] Figure 8 It is a schematic diagram of the dry-measurement gas-liquid recovery ratio of a refueling gun according to an embodiment of the present invention. As shown in the figure, the oil and gas recovery system includes a gas-liquid ratio control mainboard 810, an oil and gas recovery pump 820 and an oil and gas recovery refueling gun 830. Other tools required for the dry-measurement of the refueling gun include: a gas-liquid ratio adapter 840, a gas flow meter 850 and a detection terminal 860. The gas-liquid ratio adapter 840 can connect the oil and gas collection hole of the refueling gun to the gas flow meter 850 through a hose. Different refueling guns are suitable for different types of gas-liquid ratio adapters. The gas flow meter 850 is used to measure the volume of recovered gas and has the function of identifying the direction of gas flow. The detection terminal 860 is used to obtain the simulated oil output volume of the refueling machine and the volume flowing through the gas flow meter.

[0053] As shown in the figure, the fuel inlet of the fueling gun 830 is connected to the fuel dispenser's oil and gas recovery pump 820 via a flexible hose. A gas-to-liquid adapter 840 is installed at the fuel and gas collection hole of the fueling gun 830. The gas inlet of the gas-to-liquid adapter 840 is connected to the gas outlet of a gas flow meter 850 via an air duct. The other side of the gas flow meter 850 is the gas inlet. The encoder of the gas flow meter 850 is electrically connected to the detection terminal 860. The gas-to-liquid ratio control board 810 on the fuel dispenser is also electrically connected to the detection terminal.

[0054] Figure 9 The present invention is a flowchart of a method for detecting the gas-liquid recovery ratio using a dry detection method according to an embodiment of the present invention.

[0055] In step 910, when performing dry measurement of the gas-liquid recovery ratio, the refueling pump is kept in a closed state, and only the oil and gas recovery system of the refueling machine is kept in operation.

[0056] In step 920, the positioning member is accommodated in the dry hole. In this way, when no oil is discharged, pulling the trigger can also drive the driving mechanism of the fuel gun.

[0057] In step 930, the staff pulls the trigger assembly, and the oil and gas recovery pump starts to work, simulating the oil discharge from the refueling gun to recover oil and gas.

[0058] In step 940, after a period of time, the worker stops pulling the trigger, and the detection equipment calculates the oil and gas recovery ratio by calculating the simulated oil output volume and the recovered gas volume.

[0059] In some embodiments, to ensure test accuracy, the simulated fuel output must be greater than 50L during the test time, and the gas flow meter accuracy must be no less than ±2%. Generally, a gas-to-liquid ratio of 100%-120% is considered acceptable. If the gas-to-liquid ratio is no longer within the standard limits, and the difference between the measured gas-to-liquid ratio value and the limit is less than or equal to 10%, two more gas-to-liquid ratio tests may be performed, and the three test results calculated as the arithmetic average. If the average gas-to-liquid ratio is within the specified limits, the gas pump meets the gas-to-liquid ratio test standard; otherwise, it fails to meet the standard.

[0060] The above embodiments are only used to illustrate the present invention, and are not intended to limit the present invention. Ordinary technicians in the relevant technical field can make various changes and modifications without departing from the scope of the present invention. Therefore, all equivalent technical solutions should also fall within the scope of the present invention.

Claims

1. A fuel gun drive mechanism with a dry test function, comprising: a fixed sleeve including a first opening; a drive sleeve including a second opening; as well as a driving shaft, on which a dry measuring hole is provided; The dry meter hole is adapted to receive a locking member that enters from outside the fueling gun through the first opening and the second opening; when the locking member is received in the dry meter hole, the drive shaft and the drive shaft sleeve are locked; The drive sleeve is arranged in the fixed sleeve, the drive shaft is arranged in the drive sleeve, and the drive shaft is connected to the trigger through a conversion member. During dry testing, the trigger is pulled, and the drive shaft slides horizontally along the drive sleeve under the action of the trigger. The locking member locks the drive shaft and the drive sleeve and pushes the drive sleeve to slide horizontally, thereby opening the valve assembly and implementing dry testing in the absence of oil. A first strip hole is provided at the bottom of the fixed sleeve, and the length of the first strip hole is greater than or equal to the length of the movement of the driving shaft. A second strip hole is provided at the bottom of the driving sleeve, and the length and width of the second strip hole are both greater than the first strip hole. A positioning hole is provided at the bottom of the driving shaft; wherein the positioning member is suitable for being accommodated in the positioning hole, the first strip hole and the second strip hole. 2 . The drive mechanism according to claim 1 , wherein when the drive shaft and the drive sleeve are unlocked, the drive shaft can move relative to the drive sleeve in an axial direction.

3. The driving mechanism according to claim 1, wherein the conversion member and the trigger constitute a trigger assembly, and the first opening is an opening for a connection portion between the conversion member and the driving shaft.

4. The driving mechanism according to claim 1, wherein the first opening is a waist-shaped hole extending from both sides of the head of the fixed sleeve to the middle. The driving mechanism according to claim 4 , wherein the head of the fixed sleeve is tapered. The driving mechanism according to claim 1 , wherein the second opening is an opening corresponding to a position of the dry hole.

7. The driving mechanism according to claim 1, further comprising a return spring assembled between the driving shaft and the driving sleeve.

8. The drive mechanism according to claim 7, wherein the second opening is a U-shaped groove; when the return spring returns the drive shaft to a position away from the drive sleeve, the locking member accommodated in the dry hole is also suitable for being accommodated in the U-shaped groove.

9. A refueling gun comprising: gun body; a valve assembly configured to allow or block the passage of oil and oil vapor through the gun body; The drive mechanism according to any one of claims 1 to 8, configured to control a valve assembly; as well as A trigger assembly comprising a conversion member and a trigger, configured to drive the drive shaft in the drive mechanism according to any one of claims 1-8 to move axially.

10. The fuel gun according to claim 9, wherein when the locking member is accommodated in the dry hole, the drive shaft and the drive sleeve are locked, and the trigger assembly drives the drive mechanism according to any one of claims 1 to 8 to open the valve assembly.

11. The fuel gun according to claim 9, wherein when the drive shaft and the drive sleeve are unlocked, the trigger assembly drives the drive shaft in the drive mechanism according to any one of claims 1 to 8 to move axially relative to the drive sleeve, and the valve assembly remains closed.

12. A method for dry-testing oil vapor recovery for a fueling gun according to any one of claims 9 to 11, comprising: Keep the gas pumps turned off; The locking member is accommodated in the dry hole of the drive shaft of the fuel gun according to any one of claims 9 to 11; Pull the trigger assembly to simulate the oil discharge from the refueling gun and perform oil and gas recovery; and At regular intervals, the simulated oil output volume and recovered gas volume are obtained, and the oil and gas recovery ratio is calculated.

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