Self-checking oil and gas recovery nozzle

Abstract

The present invention discloses a self-checking oil and gas recovery refueling gun, comprising: a gun body; a gun head; a guard handle, which is arranged at the lower side of the gun body; a handle for starting the gun body for refueling; an air collecting sleeve, which is sleeved on the rear end of the gun head; an oil and gas recovery channel, which is parallel to the guard handle and arranged inside the guard handle; a first connecting sleeve, which is sleeved on the rear end of the gun head, an L-shaped extension tube extending from the lower side of the first connecting sleeve, and is connected to the oil and gas recovery channel; a second connecting sleeve, one end of which is connected to the rear end of the gun body, and the other end is used to connect to the oil pipeline of the refueling machine; an L-shaped pipe fitting, which is arranged in the second connecting sleeve, one end of which is used to connect to the return air recovery pipe of the refueling machine, and the other end extends downward and passes through the side wall of the second connecting sleeve; a transition connecting pipe, which is formed of a transparent material, one end of which is connected to the end of the oil and gas recovery channel close to the rear end of the gun body, and the other end is fixedly connected to the other end of the L-shaped pipe fitting; an airflow sensing mechanism, which is arranged in the transition connecting pipe and is used to sense the oil and gas circulation in the transition connecting pipe, and the implementation of this scheme is reliable and convenient.

Description

Technical Field

[0001] The invention relates to the technical field of refueling guns, in particular to a self-checking oil and gas recovery refueling gun. Background Art

[0002] The oil and gas recovery function of the oil and gas recovery system of a gas station is one of its necessary functions. If the return air of the gas gun fails or does not meet the standard, it is easy to cause the gas gun to jump out of the gun prematurely or affect normal adjustment or other refueling failures during refueling. Therefore, the gas gun is usually tested for its return air function during regular inspections. The return air function of the gas gun of the oil and gas recovery system of a gas station is mainly controlled by the oil and gas recovery pump installed in the gas pump. As we all know, after working for a long time, the vacuum pump will have a certain degree of power attenuation or other problems that cause its negative pressure to be damaged. The traditional way of checking the return air pump is to disassemble certain parts and reconnect them. This method not only wastes time, but also when the equipment is repeatedly disassembled and assembled, it is easy for the installation gap to become larger and air leakage to occur. Therefore, if a device can be provided that directly integrates the detection function on the gas gun and does not need to be repeatedly disassembled and inspected and can be observed intuitively, then the efficiency and convenience of gas pump inspection will be greatly improved. Summary of the invention

[0003] In view of the prior art, the purpose of the present invention is to provide a self-checking oil and gas recovery refueling gun which can detect in real time, is easy to operate, reliable to implement and low in cost.

[0004] In order to achieve the above technical objectives, the technical solution adopted by the present invention is:

[0005] A self-checking oil and gas recovery refueling gun, comprising:

[0006] Gun body;

[0007] The gun head is connected to the front end of the gun body;

[0008] The guard handle is in an arc-shaped structure and is arranged on the lower side of the gun body;

[0009] A handle, disposed between the gun body and the guard and used to activate the gun body for refueling;

[0010] The gas collecting sleeve is installed at the rear end of the gun head and is used to collect the oil and gas when the gun body is refueled;

[0011] The oil and gas recovery channel is parallel to the guard handle and is arranged inside the guard handle, and its two ends extend to the front end and the rear end of the gun body respectively;

[0012] The first connecting sleeve is sleeved on the rear end of the gun head and is located between the gas collecting sleeve and the gun body. The end of the first connecting sleeve close to the gas collecting sleeve is plugged with the gas collecting sleeve. An L-shaped extension tube extends from the lower side of the first connecting sleeve and is connected to the end of the oil and gas recovery channel close to the gun head, so that the gas collecting sleeve, the first connecting sleeve and the oil and gas recovery channel are connected to each other.

[0013] A second connecting sleeve, one end of which is connected to the rear end of the gun body, and the other end is used to connect to the oil delivery pipe of the fuel dispenser;

[0014] An L-shaped pipe fitting is arranged in the second connecting sleeve, one end of which is used to connect with the gas return pipe of the fuel dispenser, and the other end of which extends downward and passes through the side wall of the second connecting sleeve, and there is a gap between the L-shaped pipe fitting and the second connecting sleeve for gasoline to pass through;

[0015] It also includes:

[0016] The transition connecting pipe is an L-shaped tubular structure and is formed of a transparent material, one end of which is connected to the end of the oil and gas recovery channel close to the rear end of the gun body, and the other end extends upward and is fixedly connected to the other end of the L-shaped pipe fitting;

[0017] The airflow sensing mechanism is arranged in the transition connecting pipe and is used for sensing the oil and air flow in the transition connecting pipe.

[0018] As a possible implementation manner, further, a locking mechanism is provided between the L-shaped extension pipe on the lower side of the first connecting sleeve and the oil and gas recovery channel, and the locking mechanism includes:

[0019] The third connecting sleeve is a cylindrical structure with one end open, and is fixedly inserted into one side of the L-shaped extension tube connected to the oil and gas recovery channel, and the other end away from the open end faces the setting side of the handle;

[0020] A restraining spring is inserted into the third connecting sleeve;

[0021] The fourth connecting sleeve is a cylindrical structure with one end open, and the open end is sleeved on the other end of the L-shaped extension pipe, and one side of the other end of the fourth connecting sleeve is fixedly connected to the oil and gas recovery channel;

[0022] The connecting pin is a rod-shaped structure, one end of which can axially slide in sequence through the other end of the fourth connecting sleeve, the third connecting sleeve and the constraint spring, and the end of the end is provided with a first extension portion along its radial direction, one end of the constraint spring is abutted against the first extension portion, and the other end of the constraint spring is abutted against the end of the third connecting sleeve away from its open end, and the portion of the connecting pin located between the other end of the third connecting sleeve and the other end of the fourth connecting sleeve is formed with a radially extending second extension portion, and the second extension portion is used to movably close the other end of the L-shaped extension tube, and the other end of the connecting pin is movably connected to the portion of the handle close to the front end of the gun body. When the handle is in an un-refueled state, the second extension portion is abutted against the other end of the L-shaped extension tube by the action of the constraint spring, separating the L-shaped extension tube from the oil and gas recovery channel, and the handle is pulled to refuel to drive the connecting pin to pull the constraint spring to compress, so that the second extension portion moves in a direction away from the other end of the L-shaped extension tube, so that the L-shaped extension tube is connected to the oil and gas recovery channel.

[0023] As a preferred embodiment, preferably, a first sealing ring is provided at a portion of the fourth connecting sleeve corresponding to where the connecting pin passes through.

[0024] As one of the possible implementations of the airflow sensing mechanism, further, the airflow sensing mechanism includes:

[0025] A sensing iron ball is movably arranged in a transition connecting pipe, wherein the L-shaped bending portion of the transition connecting pipe is provided with an arc-shaped extension portion extending in a direction away from the oil and gas recovery channel, and an end of the transition connecting pipe close to the oil and gas recovery channel is provided with a first limiting protrusion for constraining the sensing iron ball, and an end of the transition connecting pipe close to the L-shaped pipe fitting is provided with a second limiting protrusion for constraining the sensing iron ball; a magnetic block, wherein a U-shaped extension portion is provided on the lower end surface of the transition connecting pipe, one side of the U-shaped extension portion is located below the arc-shaped extension portion, and the other side extends to an end of the transition connecting pipe close to the oil and gas recovery channel, and the magnetic block is slidably connected to the U-shaped extension portion and is used to attract and constrain the sensing iron ball in the arc-shaped extension portion of the transition connecting pipe or release the attraction constraint.

[0026] As a second possible implementation of the airflow sensing mechanism, further, the airflow sensing mechanism includes:

[0027] The impeller, the L-shaped bending portion of the transition connecting pipe is provided with an arc-shaped extension portion extending in a direction away from the oil and gas recovery channel, the impeller is rotatably connected in the arc-shaped extension portion, and the impeller is driven to rotate by the gas flow in the transition connecting pipe.

[0028] As a third possible implementation of the airflow sensing mechanism, further, the airflow sensing mechanism includes:

[0029] A negative pressure gauge, the detection end of which is connected to the transition connecting pipe.

[0030] As a possible implementation manner, further, an adjustment bolt for adjusting the gas flow rate in the L-shaped extension tube is penetrated and connected through the internal thread at the end of the L-shaped extension tube of the first connecting sleeve close to the gun head.

[0031] As a possible implementation manner, further, a second sealing ring is provided between the end of the first connecting sleeve away from the gas collecting sleeve and the gun head of the refueling gun, and a third sealing ring is provided between the transition connecting pipe and the L-shaped pipe fitting.

[0032] As a possible implementation manner, further, an extension plate is provided on one side of the end of the transition connecting pipe close to the second connecting sleeve, and a first locking bolt for threading the extension plate and the second connecting sleeve is passed through the extension plate.

[0033] As a possible implementation mode, further, a straight-through pipe fitting is connected between the second connecting sleeve and the rear end of the gun body, one end of the straight-through pipe fitting is threadedly connected to the rear end of the gun body, and a fourth sealing ring is provided between the straight-through pipe fitting and the rear end of the gun body; the second connecting sleeve is sleeve-connected to the other end of the straight-through pipe fitting and is fixed by a second locking bolt, and a fifth sealing ring is provided between the inner circumference of the second connecting sleeve and the outer circumference of the straight-through pipe fitting.

[0034] By adopting the above-mentioned technical scheme, the present invention has the following beneficial effects compared with the prior art: the present scheme cleverly arranges the transition connecting pipe connecting the oil and gas recovery channel and the L-shaped pipe fitting into the form of a transparent pipe, and then arranges an oil and gas sensing mechanism therein to sense the airflow velocity, so as to indirectly judge the working efficiency of the oil and gas recovery pump in the fuel dispenser, wherein the circulation condition and flow velocity of the oil and gas in the transition connecting pipe can be more intuitively observed through the form of an impeller or a negative pressure gauge, so as to judge the working capacity of the oil and gas recovery pump in the fuel dispenser, and if its working performance declines, the impeller speed will be greatly reduced or the indication offset of the negative pressure gauge will be smaller. , and the staff can make a simple judgment based on this, whether the oil and gas recovery pump needs to be maintained or replaced. The combination of the sensing iron ball and the magnetic block has a lower cost and a longer service life. When a self-inspection is required, it is only necessary to move the magnetic block to separate the magnetic block from the sensing iron ball and reduce its magnetic force. At this time, when refueling, the negative pressure formed by the oil and gas recovery pump will attract the sensing iron ball, causing it to rise in the direction close to the second connecting sleeve. The rising height of the sensing iron ball is used to judge the working performance of the oil and gas recovery handle. This solution is not only simple in structure and low in modification cost, but also can facilitate a rough self-inspection of the oil and gas recovery pump of the refueling machine. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] The present invention is further described below in conjunction with the accompanying drawings and specific embodiments:

[0036] Figure 1This is a schematic diagram of the implementation structure of Example 1 of the present invention, wherein the refueling gun is in a non-refueling state;

[0037] Figure 2 for Figure 1 A schematic diagram of the enlarged local structure at point A in the middle;

[0038] Figure 3 for Figure 1 A magnified schematic diagram of the local structure at B in the middle;

[0039] Figure 4 This is a schematic diagram of the implementation structure of Example 1 of the present invention, wherein the refueling gun is in a refueling state;

[0040] Figure 5 for Figure 4 A magnified schematic diagram of the local structure at C in the middle;

[0041] Figure 6 for Figure 4 A magnified schematic diagram of the local structure at D in the middle;

[0042] Figure 7 This is a schematic diagram of the simplified matching structure of the L-shaped extension tube and the adjusting bolt in Example 1 of the present invention;

[0043] Figure 8 This is a schematic diagram of a simplified implementation structure of Example 2 of the present invention;

[0044] Fig. 9 for Figure 8 A magnified schematic diagram of the local structure at E in the middle;

[0045] Fig.10 This is a schematic diagram of a simplified implementation structure of Example 2 of the present invention;

[0046] Fig.11 for Fig.10 Enlarged schematic diagram of the local structure at F in the middle. DETAILED DESCRIPTION

[0047] Example 1

[0048] like Figures 1 to 7 As shown in FIG. 1 , the self-checking oil and gas recovery refueling gun of this embodiment includes:

[0049] Gun body 1;

[0050] A gun head 11, connected to the front end of the gun body 1;

[0051] The guard handle 14 is an arc-shaped structure and is arranged on the lower side of the gun body 1;

[0052] A handle 2 is provided between the gun body 1 and the guard handle 14 and is used to start the gun body 1 to refuel;

[0053] The gas collecting sleeve 12 is sleeved on the rear end of the gun head 11 and is used to collect the oil and gas when the gun body 1 is refueled;

[0054] The oil and gas recovery channel 15 is parallel to the protective handle 14 and is arranged inside the protective handle 14, and its two ends extend to the front end and the rear end of the gun body 1 respectively; the first connecting sleeve 13 is sleeved on the rear end of the gun head 11 and is located between the gas collecting sleeve 12 and the gun body 1, and its end close to the gas collecting sleeve 12 is plugged and matched with the gas collecting sleeve 12, and an L-shaped extension tube 131 extends from its lower side and is connected to the end of the oil and gas recovery channel 15 close to the gun head 11, so that the gas collecting sleeve 12, the first connecting sleeve 13 and the oil and gas recovery channel 15 are connected to each other;

[0055] A second connecting sleeve 3, one end of which is connected to the rear end of the gun body 1, and the other end is used to connect to the oil delivery pipe of the fuel dispenser;

[0056] The L-shaped pipe fitting 4 is arranged in the second connecting sleeve 3, one end of which is used to connect with the gas return pipe of the fuel dispenser, and the other end extends downward and penetrates the side wall of the second connecting sleeve 3, and there is a gap 31 between the L-shaped pipe fitting 4 and the second connecting sleeve 3 for gasoline to pass through; it also includes:

[0057] The transition connecting pipe 5 is an L-shaped tubular structure and is formed of a transparent material, one end of which is connected to the end of the oil and gas recovery channel 15 close to the rear end of the gun body 1, and the other end extends upward and is fixedly connected to the other end of the L-shaped pipe fitting 4;

[0058] The airflow sensing mechanism is disposed in the transition connecting pipe 5 and is used for sensing the oil and air flow in the transition connecting pipe 5 .

[0059] As a possible implementation, further, a locking mechanism is provided between the L-shaped extension tube 131 at the lower side of the first connecting sleeve 13 and the oil and gas recovery channel 15, and the locking mechanism includes:

[0060] The third connecting sleeve 7 is a cylindrical structure with one end open, and is fixedly inserted into one side of the L-shaped extension tube 131 connected to the oil and gas recovery channel 15, and the other end away from the open end faces the setting side of the handle 2;

[0061] The restraining spring 71 is inserted into the third connecting sleeve 7;

[0062] The fourth connecting sleeve 73 is a cylindrical structure with one end open, and the open end is sleeved on the other end of the L-shaped extension tube 131. One side of the other end of the fourth connecting sleeve 73 is fixedly connected to the oil and gas recovery channel 15.

[0063] The connecting pin 72 is a rod-shaped structure, one end of which can axially slide through the other end of the fourth connecting sleeve 73, the third connecting sleeve 7 and the constraint spring 71 in sequence, and the end of the end is provided with a first extension portion along its radial direction, one end of the constraint spring 71 is abutted against the first extension portion, and the other end of the constraint spring 71 is abutted against the end of the third connecting sleeve 7 away from its open end, and the portion of the connecting pin 72 located between the other end of the third connecting sleeve 7 and the other end of the fourth connecting sleeve 73 is formed with a radially extending second extension portion 721, and the second extension portion 721 is used to movably close the other end of the L-shaped extension tube 131, and the other end of the connecting pin 72 is movably connected to the portion of the handle 2 close to the front end of the gun body 1, and the handle 2 can be connected to an L-shaped connecting plate 21 for movably connecting with the connecting pin 72, and when the handle 2 is in an un-fueled state, the second extension portion 721 is abutted against the L The other end of the L-shaped extension tube 131 is separated from the oil and gas recovery channel 15, and the handle 2 is pulled to add oil to drive the connecting pin 72 to pull the restraining spring 71 to compress, so that the second extension part 721 moves in the direction away from the other end of the L-shaped extension tube, so that the L-shaped extension tube 131 is connected to the oil and gas recovery channel 15.

[0064] Among them, as a preferred embodiment, preferably, the fourth connecting sleeve 73 is provided with a first sealing ring 723 at a position corresponding to the connecting pin 72 passing through.

[0065] In addition, as one of the possible implementations of the airflow sensing mechanism, further, the airflow sensing mechanism includes: a sensing iron ball 6, which is movably arranged in the transition connecting pipe 5, the L-shaped bending portion of the transition connecting pipe 5 is provided with an arc-shaped extension portion 51 extending in a direction away from the oil and gas recovery channel 15, and a first limiting protrusion 55 for constraining the sensing iron ball 6 is provided in one end of the transition connecting pipe 5 close to the oil and gas recovery channel 15, and a second limiting protrusion 56 for constraining the sensing iron ball 6 is provided in one end of the transition connecting pipe 5 close to the L-shaped pipe 4;

[0066] The magnetic block 54 is provided with a U-shaped extension portion 53 on the lower end surface of the transition connecting pipe 5, one side of the U-shaped extension portion 53 is located below the arc-shaped extension portion 51, and the other side extends to one end of the transition connecting pipe 5 close to the oil and gas recovery channel 15. The magnetic block 54 is slidably connected to the U-shaped extension portion 53 and is used to attract and constrain the sensing iron ball 6 in the arc-shaped extension portion 51 of the transition connecting pipe 5 or release the attraction constraint, wherein the magnetic block 54 can be provided with a U-shaped avoidance portion at the lower part, and then slidably placed on the U-shaped extension portion 53, and a limiting bolt 541 can be locked on the U-shaped avoidance portion, and a pair of limiting protrusions 531 for preventing the magnetic block 54 from sliding by itself are provided on the lower side surface of the U-shaped extension portion 53, and the protrusion height of the limiting protrusion 531 is consistent with the gap distance between the limiting bolt 541 and the bottom of the magnetic block 54, so as to prevent the magnetic block 54 from easily moving when it slides by itself.

[0067] As a possible implementation manner, further, an adjustment bolt 133 for adjusting the gas flow rate in the L-shaped extension tube 131 is threadedly connected to the end of the L-shaped extension tube 131 of the first connecting sleeve 13 close to the gun head 11 .

[0068] As a possible implementation, further, a second sealing ring 132 is provided between the end of the first connecting sleeve 13 away from the gas collecting sleeve 12 and the gun head 11 of the refueling gun, and a third sealing ring 57 is provided between the transition connecting pipe 5 and the L-shaped pipe fitting 4.

[0069] As a possible implementation, further, an extension plate 52 is provided on one side of the end of the transition connecting pipe 5 close to the second connecting sleeve 3 , and a first locking bolt 521 for threading the extension plate 52 and the second connecting sleeve 3 is passed through the extension plate 52 .

[0070] As a possible implementation mode, further, a straight pipe fitting 8 is connected between the second connecting sleeve 3 and the rear end of the gun body 1, one end of the straight pipe fitting 8 is threadedly connected to the rear end of the gun body 1, and a fourth sealing ring 82 is provided between the straight pipe fitting 8 and the rear end of the gun body 1; the second connecting sleeve 3 is sleeve-connected with the other end of the straight pipe fitting 8 and is locked and fixed by a second locking bolt 81, and a fifth sealing ring 83 is provided between the inner circumference of the second connecting sleeve 3 and the outer circumference of the straight pipe fitting.

[0071] The present invention ingeniously arranges the transition connecting pipe 5 connecting the oil and gas recovery channel 15 and the L-shaped pipe fitting 4 into a transparent tube, and then arranges an oil and gas sensing mechanism therein to sense the airflow velocity, so as to indirectly judge the working efficiency of the oil and gas recovery pump in the fuel dispenser. The sensing iron ball 6 and the magnetic block 54 are combined, which has a lower cost and a longer service life. When a self-inspection is required, it is only necessary to move the magnetic block 54 so that the magnetic block 54 is separated from the sensing iron ball 6 to reduce its magnetic force. When refueling is performed at this time, the negative pressure formed by the oil and gas recovery pump will attract the sensing iron ball 6, causing it to rise in a direction close to the second connecting sleeve 3, and the rising height of the sensing iron ball 6 is used to judge the working performance of the oil and gas recovery handle. The present invention is not only simple in structure and low in modification cost, but also convenient for a rough self-inspection of the oil and gas recovery pump of the fuel dispenser.

[0072] Example 2

[0073] like Figure 8 or Fig. 9 As shown, this embodiment is substantially the same as Embodiment 1, except that:

[0074] As a second possible implementation of the airflow sensing mechanism, further, the airflow sensing mechanism includes:

[0075] The impeller 9, the L-shaped bending portion of the transition connecting pipe 5 is provided with an arc-shaped extension portion 51 extending in a direction away from the oil and gas recovery channel 15, and the impeller 9 is rotatably connected in the arc-shaped extension portion 51, and the impeller 9 is driven to rotate by the gas flow in the transition connecting pipe 5.

[0076] Example 3

[0077] like Fig.10 or Fig.11 As shown, this embodiment is substantially the same as Embodiment 1, except that:

[0078] As a third possible implementation of the airflow sensing mechanism, further, the airflow sensing mechanism includes:

[0079] The negative pressure gauge 10 has its detection end connected to the transition connecting pipe 5 .

[0080] Embodiment 2 and embodiment 3 can more intuitively observe the flow condition and flow rate of oil and gas in the transition connecting pipe 5 through the form of an impeller or a negative pressure gauge, so as to judge the working capacity of the oil and gas recovery pump in the fuel dispenser. If its working performance declines, the impeller speed will drop significantly or the reading offset of the negative pressure gauge will be small, and the staff can make a simple judgment based on this whether the oil and gas recovery pump needs to be maintained or replaced.

[0081] The above is an embodiment of the present invention. For ordinary technicians in this field, according to the teachings of the present invention, all equivalent changes, modifications, substitutions and variations made within the scope of the patent application of the present invention without departing from the principles and spirit of the present invention should fall within the scope of the present invention.

Claims

1. A self-checking oil and gas recovery refueling gun, comprising: Gun body; The gun head is connected to the front end of the gun body; The guard handle is in an arc-shaped structure and is arranged on the lower side of the gun body; A handle, disposed between the gun body and the guard and used to activate the gun body for refueling; The gas collecting sleeve is installed at the rear end of the gun head and is used to collect the oil and gas when the gun body is refueled; The oil and gas recovery channel is parallel to the guard handle and is arranged inside the guard handle, and its two ends extend to the front end and the rear end of the gun body respectively; The first connecting sleeve is sleeved on the rear end of the gun head and is located between the gas collecting sleeve and the gun body. The end of the first connecting sleeve close to the gas collecting sleeve is plugged with the gas collecting sleeve. An L-shaped extension tube extends from the lower side of the first connecting sleeve and is connected to the end of the oil and gas recovery channel close to the gun head, so that the gas collecting sleeve, the first connecting sleeve and the oil and gas recovery channel are connected to each other. A second connecting sleeve, one end of which is connected to the rear end of the gun body, and the other end is used to connect to the oil delivery pipe of the fuel dispenser; An L-shaped pipe fitting is arranged in the second connecting sleeve, one end of which is used to connect with the gas return pipe of the fuel dispenser, and the other end of which extends downward and passes through the side wall of the second connecting sleeve, and there is a gap between the L-shaped pipe fitting and the second connecting sleeve for gasoline to pass through; It is characterized in that: it also includes: The transition connecting pipe is an L-shaped tubular structure and is formed of a transparent material, one end of which is connected to the end of the oil and gas recovery channel close to the rear end of the gun body, and the other end extends upward and is fixedly connected to the other end of the L-shaped pipe fitting; An airflow sensing mechanism is disposed in the transition connecting pipe and is used to sense the oil and gas flow in the transition connecting pipe; A locking mechanism is provided between the L-shaped extension pipe on the lower side of the first connecting sleeve and the oil and gas recovery channel, and the locking mechanism includes: The third connecting sleeve is a cylindrical structure with one end open, and is fixedly inserted into one side of the L-shaped extension tube connected to the oil and gas recovery channel, and the other end away from the open end faces the setting side of the handle; A restraining spring is inserted into the third connecting sleeve; The fourth connecting sleeve is a cylindrical structure with one end open, and the open end is sleeved on the other end of the L-shaped extension pipe, and one side of the other end of the fourth connecting sleeve is fixedly connected to the oil and gas recovery channel; The connecting pin is a rod-shaped structure, one end of which can axially slide through the other end of the fourth connecting sleeve, the third connecting sleeve and the constraint spring in sequence, and the end of the end is provided with a first extension portion along its radial direction, one end of the constraint spring abuts against the first extension portion, and the other end of the constraint spring abuts against the end of the third connecting sleeve away from its open end, and the portion of the connecting pin located between the other end of the third connecting sleeve and the other end of the fourth connecting sleeve is formed with a radially extending second extension portion, and the second extension portion is used to movably close the other end of the L-shaped extension tube, and the other end of the connecting pin is movably connected to the portion of the handle close to the front end of the gun body, when the handle is in an un-refueled state, the second extension portion is abutted against the other end of the L-shaped extension tube by the action of the constraint spring, and the L-shaped extension tube is separated from the oil and gas recovery channel, and the handle is pulled to refuel, so as to drive the connecting pin to pull the constraint spring to compress, so that the second extension portion moves in a direction away from the other end of the L-shaped extension tube, so that the L-shaped extension tube is connected to the oil and gas recovery channel; The end of the L-shaped extension tube of the first connecting sleeve close to the gun head is threadedly connected with an adjusting bolt for adjusting the gas flow rate in the L-shaped extension tube.

2. The self-checking oil and gas recovery refueling gun according to claim 1 is characterized in that: The fourth connecting sleeve is provided with a first sealing ring at a position corresponding to the connecting pin passing through.

3. The self-checking oil and gas recovery refueling gun according to claim 1 is characterized in that: The airflow sensing mechanism comprises: A sensing iron ball is movably arranged in the transition connecting pipe, wherein the L-shaped bending portion of the transition connecting pipe is provided with an arc-shaped extension portion extending in a direction away from the oil and gas recovery channel, a first limiting protrusion for constraining the sensing iron ball is provided in one end of the transition connecting pipe close to the oil and gas recovery channel, and a second limiting protrusion for constraining the sensing iron ball is provided in one end of the transition connecting pipe close to the L-shaped pipe fitting; A magnetic block, wherein the lower end surface of the transition connecting pipe is provided with a C-shaped extension portion, one side of the C-shaped extension portion is located below the arc-shaped extension portion, and the other side extends to one end of the transition connecting pipe close to the oil and gas recovery channel, and the magnetic block is slidably connected to the C-shaped extension portion and is used to attract and constrain the sensing iron ball in the arc-shaped extension portion of the transition connecting pipe or release the attraction constraint.

4. The self-checking oil and gas recovery refueling gun according to claim 1 is characterized in that: The airflow sensing mechanism comprises: The impeller, the L-shaped bending portion of the transition connecting pipe is provided with an arc-shaped extension portion extending in a direction away from the oil and gas recovery channel, the impeller is rotatably connected in the arc-shaped extension portion, and the impeller is driven to rotate by the gas flow in the transition connecting pipe.

5. The self-checking oil and gas recovery refueling gun according to claim 1 is characterized in that: The airflow sensing mechanism comprises: A negative pressure gauge, the detection end of which is connected to the transition connecting pipe.

6. The self-checking oil and gas recovery refueling gun according to claim 1 is characterized in that: A second sealing ring is also provided between the end of the first connecting sleeve away from the gas collecting sleeve and the gun head of the refueling gun, and a third sealing ring is also provided between the transition connecting pipe and the L-shaped pipe fitting.

7. The self-checking oil and gas recovery refueling gun according to claim 1 is characterized in that: An extension plate is provided on one side of the end of the transition connecting pipe close to the second connecting sleeve, and a first locking bolt for threading the extension plate and the second connecting sleeve is penetrated through the extension plate.

8. The self-checking oil and gas recovery refueling gun according to claim 1 is characterized in that: A straight-through pipe fitting is also connected between the second connecting sleeve and the rear end of the gun body, one end of the straight-through pipe fitting is threadedly connected to the rear end of the gun body, and a fourth sealing ring is also provided between the straight-through pipe fitting and the rear end of the gun body; the second connecting sleeve is sleeve-connected to the other end of the straight-through pipe fitting and is fixed by a second locking bolt, and a fifth sealing ring is also provided between the inner circumference of the second connecting sleeve and the outer circumference of the straight-through pipe fitting.

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