A mobile natural gas refueling device

Abstract

This invention belongs to the technical field of natural gas refueling equipment and discloses a mobile natural gas refueling device, including a fixed frame and a mobile natural gas pipeline. A cover plate located outside the mobile natural gas pipeline is bolted to one side of the fixed frame. Six connecting modules are arranged in a ring at equal angles inside the outer wall of the fixed frame. A movable module connected to the fixed frame is fixedly connected to the outside of the connecting modules. An active module fixedly connected to the fixed frame is connected to the outer end of the movable module. This invention achieves the purpose of quickly and stably sealing the pipeline connection area by setting up rotating modules and connecting modules in cooperation. Its lower end will abut against the abutment block, and the abutment block will move away from the connecting module, causing the second gear to rotate. The second gear causes the sealing plate to move in the opposite direction to the abutment block and gradually move towards the middle area of ​​the two mobile natural gas pipelines until it is completely sealed.

Description

Technical Field

[0001] This invention belongs to the technical field of natural gas refueling equipment, specifically a mobile natural gas refueling device. Background Technology

[0002] Mobile natural gas refueling vehicles offer unparalleled flexibility compared to existing fixed-point refueling equipment. In complex terrain, fixed-point refueling equipment cannot be moved, increasing the complexity of actual refueling. When transporting refueling equipment in complex terrain, the bumpy terrain can cause gas leaks at the pipe connections. Therefore, natural gas leak detection devices are usually placed at the pipe connection areas of mobile natural gas refueling vehicles to prevent gas leaks during transport.

[0003] For example, utility model application CN202320239580.4 discloses a rapid detection device for natural gas pipeline leaks, including a natural gas pipeline. A sleeve is fitted onto the outer wall of the natural gas pipeline, and rubber sleeves are fixedly fitted on both sides of the inner wall of the sleeve. The rubber sleeves are tightly fitted to the outer wall of the natural gas pipeline. A through pipe is fixedly connected to the surface of the sleeve, and a flow meter is connected between the through pipes. A one-way valve is fixedly fitted to the lower end of the inner wall of the through pipe, and the one-way valve is located below the flow meter. A support structure is fixedly fitted to the upper end of the inner wall of the through pipe. A connecting cylinder is screwed to the outer wall of the through pipe, and a storage box is fixedly connected to the upper end of the connecting cylinder. A sealing structure is fixedly fitted to the inner wall of the storage box, and the sealing structure matches the support structure. This utility model can quickly and accurately locate the leak point by moving the device on the outer wall of the natural gas pipeline, avoiding unnecessary losses, while ensuring safety in use.

[0004] The patent described above describes a method of detecting and sealing natural gas leaks by "fitting a sleeve onto the outer wall of the natural gas pipeline" and using a flow meter. While this method achieves some degree of detection and sealing, in practical use, the long length of natural gas pipelines and the uncertainty of which area will leak significantly increase operating costs and labor intensity. Furthermore, the combination of a flow meter and a check valve can lead to poor signal reception due to terrain and other factors, resulting in long signal reception times. Consequently, it fails to effectively and promptly monitor and seal leaking natural gas. Therefore, improvements are needed. Summary of the Invention

[0005] To address the problem mentioned in the background art of the inability to accurately and quickly detect and seal natural gas, the present invention provides a mobile natural gas refueling device.

[0006] To achieve the above objectives, the present invention provides the following technical solution: a mobile natural gas refueling device, comprising a fixed frame and a mobile natural gas pipeline, wherein a cover plate located outside the mobile natural gas pipeline is bolted to one side of the fixed frame, and six connecting modules are arranged at equal angles in a ring on the inner side of the outer wall of the fixed frame, wherein a movable module connected to the fixed frame is fixedly connected to the outer side of the connecting modules, and a movable module fixedly connected to the fixed frame is connected to the outer end of the movable module, wherein an abutting module connected to the connecting modules is provided on the back of the fixed frame, the top end of the abutting module abuts against the fixed frame, and a rotating module fixedly connected to the fixed frame is abutting against the outer wall of the lower end of the connecting module.

[0007] Preferably, the movable module includes a special corrugated pipe fixedly connected to the top of the connecting module. The top of the special corrugated pipe is fixedly connected to the movable module. A first flexible spring is movably sleeved on the outside of the special corrugated pipe. The upper and lower ends of the first flexible spring are fixedly connected to the movable module and the special corrugated pipe respectively from top to bottom. After compression, the special corrugated pipe will allow the air inside to enter the interior of the fixed pipe and move the subsequent C-shaped rod through the fixed pipe, thereby facilitating the collection of natural gas leaking from the flange connection of the movable natural gas pipeline.

[0008] Preferably, the movable module includes a fixed tube fixedly connected to the fixed frame. The bottom end of the fixed tube extends into the interior of the movable module. C-shaped rods are movably connected to the interior of both ends of the fixed tube. A first connecting tube connected to the movable module is movably sleeved on the outer side of the bottom end of the C-shaped rod. A second connecting tube is movably snapped onto the side of the bottom end of the first connecting tube near the movable module. The bottom of the second connecting tube extends into the interior of the connecting module. A second flexible spring is movably sleeved on the outer wall of the fixed tube. The two ends of the second flexible spring are fixedly connected to the C-shaped rod and the fixed tube, respectively. After the special corrugated pipe is compressed, the air inside it will enter the interior of the fixed tube and push the C-shaped rod. The end of the C-shaped rod located in the first connecting tube will move away from the movable module. At this time, the inner end of the first connecting tube will be in a negative pressure state due to the pull of the first connecting tube. Natural gas leaking outward will be adsorbed into the interior of the first connecting tube through the first connecting tube and the second connecting tube, thereby avoiding subsequent backflow.

[0009] Preferably, the connecting module includes a connecting block that is movably connected to the inside of the fixed frame. The top of the connecting block is fixedly connected to the moving module and the moving module respectively. A first air passage communicating with the inside of the moving module is opened in the middle of the connecting block. A chamber communicating with the first air passage is opened inside the lower end of the connecting block. Air grooves are opened on both sides of the bottom surface of the chamber. The bottom end of the connecting block is directly opposite the middle area of ​​the two movable natural gas pipelines. A toothed plate that engages with the abutment module is provided on the back of the connecting block.

[0010] Preferably, the abutment module includes a first gear connected to the bearing of the fixed frame. A belt is sleeved on the outer wall of the first gear. An eccentric wheel that abuts against the fixed frame is sleeved inside the upper end of the belt. The rear end of the eccentric wheel is connected to the bearing of the fixed frame. When the connecting block moves upward, it will drive the toothed plate on its back to move upward as well. The toothed plate will drive the eccentric wheel through the first gear and the belt to intermittently abut and knock against the inner wall of the fixed frame at that position, thereby reminding the staff for warning purposes.

[0011] Preferably, the rotating module includes a contact block that abuts against the lower end of the connecting module. A spring telescopic tube connected to the inner wall of the fixing frame is provided on the side of the contact block away from the connecting module. A second gear is engaged at the bottom of the contact block. A circular shaft fixedly connected to the fixing frame is movably sleeved on the outer wall of the second gear. A sealing plate is engaged at the bottom of the second gear. A telescopic cylinder connected to the inner wall of the fixing frame is fixedly connected to the end of the sealing plate away from the connecting module. An installation plate is fixedly connected to the bottom of the sealing plate. There is a gap between the bottom end of the installation plate near the connecting module and the end of the sealing plate near the connecting module. When the contact block is compressed, it will move towards the end away from the connecting module, and through the second gear, the sealing plate will move in the opposite direction. The sealing plate will gradually move towards the end near the connecting module and seal the leaking area at the connection of the two movable natural gas pipeline flanges, providing a secondary seal to prevent continuous natural gas leakage.

[0012] Preferably, there are two sets of C-shaped rods to the second flexible spring, and the two second connecting tubes are both L-shaped, with their bottom ends converging into a single pipe and extending into the interior of the connecting module.

[0013] Preferably, the bottom end of the connecting block is trapezoidal, and its outer wall is in contact with the rotating module. No air groove is provided in the middle of the bottom surface of the cavity.

[0014] Preferably, the inner wall of the fixing frame is provided with six arc-shaped blocks at equal angles, and the six arc-shaped blocks are respectively located in the middle of two adjacent connecting blocks and their inner walls are in contact with the connection area of ​​the two mobile natural gas pipelines.

[0015] Preferably, the upper end of the connecting block is T-shaped.

[0016] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0017] This invention achieves rapid and stable sealing of the pipeline connection area by setting up a rotating module and a connecting module, etc., without being affected by external conditions. When the connecting block moves upward, its lower end will abut against the contact block. The contact block moves away from the connecting module and causes the second gear to rotate. The second gear causes the sealing plate to move in the opposite direction to the contact block and gradually move towards the middle area of ​​the two movable natural gas pipelines until it is completely sealed.

[0018] This invention achieves the purpose of fixed-point abnormal noise warning by setting up a counter-module and a connecting module, which facilitates the accurate and quick detection by staff. During the upward movement of the connecting block, the toothed plate on its back drives the first gear to rotate. The first gear causes the eccentric wheel to intermittently knock against the inner wall of the fixed frame through the belt, thereby producing abnormal noise and reminding staff that there is a leak in the area.

[0019] This invention, through the coordinated use of a moving module and an active module, prevents leaked natural gas from escaping. The leaking natural gas will rise and press against the bottom of the connecting block, causing it to move upwards and press against the special bellows. The compressed air inside the bellows will then press against the C-shaped rod inside the fixed pipe, causing its bottom end to move outwards inside the first connecting pipe. This allows the second connecting pipe to draw in the leaked natural gas through the first air passage, chamber, and air groove, preventing backflow of the leaked natural gas. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the structure of the present invention;

[0021] Figure 2 This is a schematic diagram of the side cross-sectional structure of the present invention;

[0022] Figure 3 This is a schematic diagram of the front cross-sectional structure of the present invention;

[0023] Figure 4 for Figure 3 A magnified schematic diagram of the partial structure at point A in the middle;

[0024] Figure 5 This is a cross-sectional view of the fixing frame of the present invention;

[0025] Figure 6 for Figure 5 A magnified schematic diagram of the local structure at point B;

[0026] Figure 7 for Figure 5 A magnified schematic diagram of the structure at point C in the middle;

[0027] Figure 8 This is a schematic diagram showing the structural fit between the fixed frame and the mobile natural gas pipeline of the present invention;

[0028] Figure 9 This is a schematic diagram of the rear structure of the fixing frame of the present invention;

[0029] Figure 10 for Figure 9 A magnified schematic diagram of the structure at point D.

[0030] In the diagram: 1. Fixed frame; 2. Cover plate; 3. Mobile natural gas pipeline; 4. Moving module; 41. Special corrugated pipe; 42. First flexible spring; 5. Movable module; 51. C-shaped rod; 52. First connecting pipe; 53. Second connecting pipe; 54. Fixed pipe; 55. Second flexible spring; 6. Connecting module; 61. Connecting block; 62. First gas passage; 63. Gas groove; 64. Chamber; 7. Abutment module; 71. First gear; 72. Eccentric wheel; 73. Belt; 8. Rotating module; 81. Abutment block; 82. Spring telescopic tube; 83. Second gear; 84. Circular shaft; 85. Sealing plate; 86. Mounting plate; 87. Telescopic cylinder. Detailed Implementation

[0031] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0032] like Figures 1 to 10 The present invention provides a mobile natural gas refueling device, including a fixed frame 1 and a mobile natural gas pipeline 3. A cover plate 2 located outside the mobile natural gas pipeline 3 is bolted to one side of the fixed frame 1. Six connecting modules 6 are arranged in a ring at equal angles inside the outer wall of the fixed frame 1. A movable module 4 connected to the fixed frame 1 is fixedly connected to the outer side of the connecting module 6. A movable module 5 fixedly connected to the fixed frame 1 is connected to the outer end of the movable module 4. An abutting module 7 connected to the connecting module 6 is provided on the back of the fixed frame 1. The top of the abutting module 7 abuts against the fixed frame 1. A rotating module 8 fixedly connected to the fixed frame 1 is abutting against the outer wall of the lower end of the connecting module 6.

[0033] like Figure 6As shown, the moving module 4 includes a special corrugated tube 41 that is fixedly connected to the top of the connecting module 6. The top of the special corrugated tube 41 is fixedly connected to the moving module 5. A first flexible spring 42 is movably sleeved on the outside of the special corrugated tube 41. The upper and lower ends of the first flexible spring 42 are fixedly connected to the moving module 5 and the special corrugated tube 41 from top to bottom, respectively.

[0034] The above solution involves the cooperation of the special corrugated pipe 41 and the first flexible spring 42. When the connecting block 61 moves upward, it will squeeze the bottom of the special corrugated pipe 41. After compression, the special corrugated pipe 41 will allow the internal air to enter the interior of the fixed pipe 54, and the fixed pipe 54 will move the subsequent C-shaped rod 51. This facilitates the collection of natural gas leaking from the flange connection of the mobile natural gas pipeline 3, preventing backflow. The first flexible spring 42 will then reset the special corrugated pipe 41.

[0035] like Figure 6 As shown, the movable module 5 includes a fixed tube 54 fixedly connected to the fixed frame 1. The bottom end of the fixed tube 54 extends into the interior of the movable module 4. C-shaped rods 51 are movably connected to the interior of both ends of the fixed tube 54. A first connecting tube 52 connected to the movable module 4 is movably sleeved on the outer side of the bottom end of the C-shaped rod 51. A second connecting tube 53 is movably snapped onto the side of the bottom end of the first connecting tube 52 near the movable module 4. The bottom of the second connecting tube 53 extends into the interior of the connecting module 6. A second flexible spring 55 is movably sleeved on the outer wall of the fixed tube 54. The two ends of the second flexible spring 55 are fixedly connected to the C-shaped rod 51 and the fixed tube 54, respectively.

[0036] The above solution involves the following: After the special corrugated pipe 41 is compressed, the air inside it will enter the fixed pipe 54 and push the C-shaped rod 51. The end of the C-shaped rod 51 located in the first connecting pipe 52 will move away from the moving module 4. At this time, the inner end of the first connecting pipe 52 will be under negative pressure due to the pulling of the first connecting pipe 52. The leaking natural gas will be absorbed into the interior of the first connecting pipe 52 through the first connecting pipe 52 and the second connecting pipe 53, thereby avoiding the subsequent backflow effect.

[0037] like Figure 7As shown, the connecting module 6 includes a connecting block 61 that is movably connected to the inside of the fixed frame 1. The top of the connecting block 61 is fixedly connected to the moving module 4 and the moving module 5 respectively. The middle part of the connecting block 61 is provided with a first air passage 62 that communicates with the inside of the moving module 5. The lower end of the connecting block 61 is provided with a chamber 64 that communicates with the first air passage 62. Air grooves 63 are provided on both sides of the bottom surface of the chamber 64. The bottom end of the connecting block 61 is directly opposite the middle area of ​​the two movable natural gas pipelines 3. The back of the connecting block 61 is provided with a toothed plate that engages with the contact module 7.

[0038] Using the above scheme: Through the cooperation of the connecting block 61 and the chamber 64, when natural gas leaks at any position in the flange connection area of ​​the two mobile natural gas pipelines 3, the natural gas will continuously spray outward and blow upward into the interior of the bottom of the connecting block 61. The connecting block 61 will gradually move upward. Since there is no gas groove 63 in the middle of the bottom surface of the chamber 64, after the connecting block 61 rises a certain distance, the second connecting pipe 53 will suck in the leaked natural gas through the first gas passage 62 and the gas groove 63. At the same time, the lower end of the connecting block 61 will also abut against the rotating module 8, causing the rotating module 8 to seal the natural gas leak position at the flange connection of the two mobile natural gas pipelines 3. The elastic force of the first flexible spring 42 will not affect the upward push of the natural gas on the bottom of the connecting block 61.

[0039] like Figure 10 As shown, the abutment module 7 includes a first gear 71 connected to the bearing of the fixed frame 1. A belt 73 is sleeved on the outer wall of the first gear 71. An eccentric wheel 72 that abuts against the fixed frame 1 is sleeved inside the upper end of the belt 73. The rear end of the eccentric wheel 72 is connected to the bearing of the fixed frame 1.

[0040] The above scheme is adopted: through the cooperation of the first gear 71 and belt 73, etc., by Figure 10 It is known that when the connecting block 61 moves upward, it will drive the toothed plate on its back to move upward as well. The toothed plate will drive the eccentric wheel 72 to intermittently hit the inner wall of the fixed frame 1 at that position through the first gear 71 and the belt 73, so as to remind the staff to accurately determine the location of the leak and carry out subsequent repairs.

[0041] like Figure 4As shown, the rotating module 8 includes a contact block 81 that abuts against the lower end of the connecting module 6. A spring telescopic tube 82 connected to the inner wall of the fixing frame 1 is provided on the side of the contact block 81 away from the connecting module 6. A second gear 83 is engaged at the bottom of the contact block 81. A circular shaft 84 fixedly connected to the fixing frame 1 is movably sleeved on the outer wall of the second gear 83. A sealing plate 85 is engaged at the bottom of the second gear 83. A telescopic cylinder 87 connected to the inner wall of the fixing frame 1 is fixedly connected to the end of the sealing plate 85 away from the connecting module 6. An installation plate 86 is fixedly connected to the bottom of the sealing plate 85. There is a gap between the bottom end of the installation plate 86 near the connecting module 6 and the bottom end of the sealing plate 85 near the connecting module 6.

[0042] The above solution involves the cooperation of the contact block 81 and the telescopic cylinder 87. When the connecting block 61 moves upward, it will press against the contact block 81. After being pressed, the contact block 81 will move away from the connecting module 6 and cause the sealing plate 85 to move in the opposite direction through the second gear 83. The sealing plate 85 will gradually move closer to the connecting module 6 and seal the leaking position in the flange connection area of ​​the two mobile natural gas pipelines 3, thus providing secondary sealing and preventing continuous leakage of natural gas.

[0043] like Figure 6 , Figure 7 As shown, there are two sets of C-shaped rods 51 to the second flexible spring 55. The two second connecting pipes 53 are both L-shaped, and their bottom ends converge into one pipe and extend into the interior of the connecting module 6. The bottom end of the connecting block 61 is trapezoidal, and its outer wall is in contact with the rotating module 8. No air groove 63 is provided in the middle of the bottom surface of the cavity 64.

[0044] The above solution is adopted: through the design of the bottom shape of the connecting block 61 and the inner cavity of the chamber 64, on the one hand, it is ensured that the middle of the bottom surface of the connecting block 61 can be affected by the continuous leakage of natural gas from the flange connection area of ​​the two movable natural gas pipelines 3, causing the connecting block 61 to interact upwards; on the other hand, the gas groove 63 ensures that the subsequent active module 5 can absorb the leaked natural gas through the gas groove 63; through the design of the two C-shaped rods 51 to the second flexible spring 55, the absorption capacity of the first connecting pipe 52 for the natural gas at the bottom of the connecting module 6 will be greatly improved.

[0045] like Figure 5 , Figure 6 , Figure 7 As shown, the inner wall of the fixed frame 1 is provided with six arc-shaped blocks at equal angles. The six arc-shaped blocks are located in the middle of two adjacent connecting blocks 61, and their inner walls are in contact with the connection area of ​​the two mobile natural gas pipelines 3. The upper part of the connecting block 61 is shaped like a "T".

[0046] By adopting the above solution: the "T"-shaped design of the upper part of the connecting block 61 will ensure that the connecting block 61 will not fall down from the inside of the fixed frame 1 when it moves downward; the arc-shaped stop design of the inner wall of the fixed frame 1 will seal the middle area of ​​two adjacent connecting blocks 61, and prevent natural gas leakage in the area between two adjacent connecting blocks 61, which would cause the rotating module 8 to fail to seal it.

[0047] Working principle and usage process of this invention:

[0048] In use, firstly, the fixing frame 1 and the cover plate 2 are respectively placed on the outer walls of the two mobile natural gas pipelines 3. Then, the cover plate 2 is connected to the fixing frame 1 so that the inner wall of the fixing frame 1 fits against the connection area of ​​the flanges of the two mobile natural gas pipelines 3, thereby realizing the installation and fixing of the device.

[0049] The arc-shaped baffles located on the inner wall of the fixed frame 1 will be spaced against the outer wall of the fixed frame 1. When a leak occurs in the connection area of ​​the two mobile natural gas pipelines 3, the leaked natural gas will rise and fill the bottom of the connecting block 61. The connecting block 61 moves upward and abuts against the special corrugated pipe 41, compressing it. After the special corrugated pipe 41 is compressed, the air inside will abut against the C-shaped rod 51 inside the fixed pipe 54, causing its bottom end to move outward inside the first connecting pipe 52. This allows the second connecting pipe 53 to draw in the leaked natural gas through the first gas passage 62, the chamber 64, and the gas groove 63, preventing the natural gas from flowing back.

[0050] At the same time, when the connecting block 61 moves upward, its lower end will abut against the abutting block 81. After abutting, the abutting block 81 will cause the sealing plate 85 to gradually move towards the middle area of ​​the two movable natural gas pipelines 3 through the second gear 83 until it is completely blocked.

[0051] During the upward movement of the connecting block 61, the toothed plate on its back will drive the first gear 71 to rotate. While the first gear 71 is rotating, the belt 73 will cause the eccentric wheel 72 to intermittently knock against the inner wall of the fixed frame 1, thereby producing abnormal noise and alerting the staff that there is a leak in the area.

[0052] In summary, this achieves a triple effect of preventing backflow at a fixed point, sealing at a fixed point, and issuing a warning when abnormal noise occurs at a fixed point, thereby improving the stability and sealing of the connection points when the pipeline is used outdoors.

[0053] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.

[0054] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A mobile natural gas filling device comprising a fixed frame (1), a mobile natural gas pipeline (3), characterized in that: The fixed frame (1) is bolted to one side of a cover plate (2) located outside the mobile natural gas pipeline (3). The fixed frame (1) has six connecting modules (6) arranged in a ring at equal angles inside its outer wall. The connecting module (6) is fixedly connected to a moving module (4) connected to the fixed frame (1). The moving module (4) is connected to an active module (5) fixedly connected to the fixed frame (1) at its outer end. The fixed frame (1) has a contact module (7) connected to the connecting module (6) on its back side. The top of the contact module (7) is in contact with the fixed frame (1). The lower end of the connecting module (6) is in contact with a rotating module (8) fixedly connected to the fixed frame (1). The moving module (4) includes a special corrugated tube (41) fixedly connected to the top of the connecting module (6). The top of the special corrugated tube (41) is fixedly connected to the moving module (5). A first flexible spring (42) is movably sleeved on the outside of the special corrugated tube (41). The upper and lower ends of the first flexible spring (42) are fixedly connected to the moving module (5) and the special corrugated tube (41) from top to bottom, respectively. The active module (5) includes a fixed tube (54) fixedly connected to the fixed frame (1). The bottom end of the fixed tube (54) extends into the interior of the moving module (4). C-shaped rods (51) are movably connected to the interior of both ends of the fixed tube (54). A first connecting tube (52) connected to the moving module (4) is movably sleeved on the outer side of the bottom end of the C-shaped rod (51). A second connecting tube (53) is movably snapped onto the side of the bottom end of the first connecting tube (52) near the moving module (4). The bottom of the second connecting tube (53) extends into the interior of the connecting module (6). A second flexible spring (55) is movably sleeved on the outer wall of the fixed tube (54). The two ends of the second flexible spring (55) are fixedly connected to the C-shaped rod (51) and the fixed tube (54) respectively. The connecting module (6) includes a connecting block (61) that is movably connected to the inside of the fixed frame (1). The top of the connecting block (61) is fixedly connected to the moving module (4) and the moving module (5) respectively. The middle part of the connecting block (61) is provided with a first air passage (62) that communicates with the inside of the moving module (5). The lower end of the connecting block (61) is provided with a chamber (64) that communicates with the first air passage (62). Gas grooves (63) are provided on both sides of the bottom surface of the chamber (64). The bottom end of the connecting block (61) is directly opposite the middle area of ​​the two mobile natural gas pipelines (3). The back of the connecting block (61) is provided with a toothed plate that engages with the contact module (7). The abutting module (7) includes a first gear (71) connected to the bearing of the fixed frame (1). A belt (73) is sleeved on the outer wall of the first gear (71). An eccentric wheel (72) that abuts against the fixed frame (1) is sleeved inside the upper end of the belt (73). The rear end of the eccentric wheel (72) is connected to the bearing of the fixed frame (1). The rotating module (8) includes a contact block (81) that abuts against the lower end of the connecting module (6). A spring telescopic tube (82) connected to the inner wall of the fixing frame (1) is provided on the side of the contact block (81) away from the connecting module (6). A second gear (83) is engaged at the bottom of the contact block (81). A circular shaft (84) fixedly connected to the fixing frame (1) is movably sleeved on the outer wall of the second gear (83). A sealing plate (85) is engaged at the bottom of the second gear (83). A telescopic cylinder (87) connected to the inner wall of the fixing frame (1) is fixedly connected at the end of the sealing plate (85) away from the connecting module (6). An installation plate (86) is fixedly connected at the bottom of the sealing plate (85). There is a gap between the bottom end of the installation plate (86) near the connecting module (6) and the end of the sealing plate (85) near the connecting module (6).

2. The mobile natural gas refueling device according to claim 1, characterized in that: The C-shaped rod (51) and the second flexible spring (55) are each provided in two sets. The two second connecting tubes (53) are both L-shaped, and their bottom ends converge into a single pipe and extend into the interior of the connecting module (6).

3. The mobile natural gas refueling device according to claim 1, characterized in that: The bottom of the connecting block (61) is trapezoidal, and its outer wall is in contact with the rotating module (8). The middle part of the bottom surface of the cavity (64) is not provided with an air groove (63).

4. The mobile natural gas refueling device according to claim 1, characterized in that: The inner wall of the fixed frame (1) is provided with six arc-shaped blocks at equal angles. The six arc-shaped blocks are located in the middle of two adjacent connecting blocks (61) and their inner walls are in contact with the connection area of ​​the two mobile natural gas pipelines (3).

5. The mobile natural gas refueling device according to claim 1, characterized in that: The upper part of the connecting block (61) is shaped like a "T".

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