A hydrogen filling device

Abstract

The present invention discloses a hydrogen filling device, which belongs to the field of hydrogen energy vehicle filling, and includes a container, a storage tank unit, a hydrogen compressor and a filling machine. The storage tank unit includes a hydrogen storage tank and a nitrogen storage tank, which are arranged side by side at one end inside the container, and the hydrogen compressor is located at the other end inside the container. A waste heat utilization component is arranged at the heat dissipation port of the hydrogen compressor, and a filling gun is arranged on the outer wall of the filling machine, and a purge component is arranged inside the filling gun. The present invention arranges a waste heat utilization component, and the heat of the oil cooling radiator is transferred to the nitrogen heating bin by a heat conduction pipeline for storage and the nitrogen is heated by a heating network. By arranging a purge component, when the heated nitrogen enters the surrounding part of the purge pipe, the gun body of the filling gun is heated by the heat of the nitrogen, and the nitrogen is discharged from the air outlet to purge the output end of the filling gun, so as to avoid freezing of the filling gun and explosion of leaked hydrogen at the docking point.

Description

Technical Field

[0001] The invention relates to the technical field of hydrogen energy vehicle filling, and in particular to a hydrogen filling device. Background Art

[0002] The hydrogen filling device is used to refill the hydrogen storage tank in the hydrogen fuel cell vehicle, including a skid-mounted hydrogen filling station. The hydrogen filling device connects the hydrogen filling station and the vehicle's hydrogen filling port through a filling gun, and injects hydrogen into the hydrogen storage tank of the hydrogen fuel cell vehicle through pressure. The existing hydrogen filling device can reach a pressure of 70MPa during the filling process and the filling rate is 120g / s. The filling of buses and heavy trucks can be completed in about ten minutes;

[0003] When the existing hydrogen filling device is filling at high speed, it is necessary to use a heat exchanger to pre-cool the hydrogen to -40°C before filling, so as to prevent the heat in the vehicle hydrogen storage tank from reaching the high temperature resistance limit of its material. However, the hydrogen pre-cooled to -40°C will absorb the heat on the surface and inside of the filling gun during filling, making the internal temperature of the filling gun too low and freezing, causing the filling gun valve to get stuck, and the filling gun and the vehicle filling port to freeze, making it difficult to pull out the filling gun. In addition, because the surface temperature of the filling gun is low during filling, if the user pulls out the filling gun without wearing gloves due to negligence after filling, it will cause frostbite on the hands;

[0004] At the same time, since hydrogen is the smallest molecule in nature, leakage is inevitable during the filling process. The leaked hydrogen accumulates in large quantities at the joint between the filling gun and the hydrogen filling port of the car, and is easily mixed with oxygen in the air to a proportion that can explode. The safety is low. In order to avoid hydrogen explosion, the staff needs to hold a leak detector for detection during filling, making the filling process cumbersome.

[0005] Therefore, a hydrogen filling device is proposed to solve the above problems. Summary of the invention

[0006] The purpose of the present invention is to solve the problem in the prior art that the surface and interior of the filling gun of the hydrogen filling device may freeze during filling, resulting in valve jamming, difficulty in pulling out the filling gun and easy frostbite of users, and to propose a hydrogen filling device.

[0007] In order to achieve the above object, the present invention adopts the following technical solutions:

[0008] A hydrogen filling device, comprising a container with a storage tank unit, a hydrogen compressor and a filling machine arranged therein, the storage tank unit comprising a hydrogen storage tank and a nitrogen storage tank, the hydrogen storage tank and the nitrogen storage tank being arranged side by side at one end of the container, the hydrogen compressor being located at the other end of the container, the hydrogen compressor comprising a heat dissipation port, a waste heat utilization component being arranged at the heat dissipation port, the filling machine being located at the lower surface of the container outside near the hydrogen compressor, a filling gun being arranged on the outer side wall of the filling machine, a purge component being arranged in the filling gun, and a hydrogen filling pipe being arranged at the input end of the filling gun;

[0009] The output end flange of the hydrogen storage tank is connected to a hydrogen pipeline, the output end of the hydrogen pipeline is flange-connected to the input end flange of the hydrogen compressor, the output end of the hydrogen compressor is flange-connected to the hydrogen input end flange of the filling machine, and the hydrogen output end of the filling machine is fixedly connected to the input end of the hydrogen filling pipe;

[0010] The waste heat utilization component includes an oil cooling radiator, a nitrogen heating chamber is arranged on the side of the oil cooling radiator away from the hydrogen compressor, a heat transfer pipeline is fixedly connected to the oil cooling radiator toward the nitrogen heating chamber, the heat transfer pipeline is located in the nitrogen heating chamber, and the two ends of the nitrogen heating chamber are flange-connected with nitrogen delivery pipelines, the input end of the nitrogen delivery pipeline is flange-connected to the input end of the nitrogen storage tank, the output end of the nitrogen delivery pipeline is flange-connected to the nitrogen input end of the filling machine, and the nitrogen output end of the filling machine is connected to the input end of the purge component;

[0011] The purge assembly includes a purge head and a purge pipe, the input end of the purge pipe is fixedly connected to the nitrogen output end of the filling machine, the output end of the purge pipe is fixedly connected to the input end of the purge head, the purge head is fixedly installed at the output end of the filling gun, and the input end of the purge head is fixedly connected to the output end of the purge pipe.

[0012] Preferably, a liquid injection port is provided at the top of the nitrogen heating chamber, a vacuum layer is provided at the inner wall of the nitrogen heating chamber, heating pipes are fixedly connected at both ends inside the nitrogen heating chamber, and the heat conduction pipeline is connected to the pipeline of the oil cooling radiator to supply coolant to enter the heat conduction pipeline.

[0013] Preferably, a plurality of heating nets are fixedly connected in the heating tube to increase the heating rate of the nitrogen.

[0014] Preferably, the filling gun comprises a valve, an outer wall of the filling gun is provided with an open mounting groove at the valve, surfaces at both ends of the mounting groove are provided with a plurality of positioning grooves, and a plurality of sealing shells are provided at the mounting groove.

[0015] Preferably, the sealing shell is relatively arranged at the installation groove, the inner wall of the sealing shell is fixedly connected with a thermal insulation pad, the inner wall of the sealing shell is fixedly connected with a positioning block at the positioning groove corresponding to the inner wall of the sealing shell, one of the sealing shells is provided with a slot on the side facing the valve, and the other sealing shell is fixedly connected with a clamping head at the corresponding slot.

[0016] Preferably, a through hole is provided in the sealing shell at a position corresponding to the valve, and the size of the clamping head is larger than the clamping slot, so that the clamping head and the clamping slot are interference fit after clamping.

[0017] Preferably, the portion of the purge pipe located in the mounting groove is exposed and surrounds the valve, so as to heat the valve portion of the filling gun to prevent the valve portion from freezing.

[0018] Preferably, an air duct is provided in the purge head, and a plurality of air outlet holes are provided at the output end of the purge head corresponding to the filling gun for discharging heated nitrogen, so as to purge the output end of the filling gun during filling.

[0019] Compared with the prior art, the present invention has the following beneficial effects:

[0020] 1. The present invention arranges a waste heat utilization component, conducts the heat of the oil cooling radiator to the liquid in the nitrogen heating chamber through a heat conduction pipeline and keeps it warm through a vacuum layer, the liquid in the nitrogen heating chamber conducts the heat to the heating pipe, the heating pipe conducts the heat to the heating network, when the nitrogen passes through the heating pipe, it is heated by the heating network, so as to recover the heat generated by the hydrogen compressor for heating the nitrogen.

[0021] 2. The present invention provides a purge assembly. When the heated nitrogen enters the part surrounded by the purge pipe, the heat of the nitrogen heats the gun body of the filling gun. When the heated nitrogen is discharged from the air outlet, the output end of the filling gun is purged, thereby preventing the outer wall of the filling gun and the inside of the valve from freezing, which may cause frostbite to the user and inability to pull out the filling gun. At the same time, the nitrogen is mixed with the air in the docking area to prevent the leaked hydrogen at the docking point of the filling gun from mixing with the air to a ratio that can explode, thereby improving the safety during filling, and there is no need to use a leak detector for real-time detection. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 This is a schematic diagram of the external structure of a hydrogen filling device proposed by the present invention;

[0023] Figure 2 This is a schematic diagram of the internal structure of a hydrogen filling device proposed by the present invention;

[0024] Figure 3 This is a structural schematic diagram of a waste heat utilization component in a hydrogen filling device proposed by the present invention;

[0025] Figure 4This is a structural assembly diagram of a waste heat utilization component and a hydrogen compressor in a hydrogen filling device proposed by the present invention;

[0026] Figure 5 This is a structural schematic diagram of a waste heat utilization component in a hydrogen filling device proposed by the present invention;

[0027] Figure 6 This is a cross-sectional view of the internal structure of a nitrogen heating chamber in a hydrogen filling device proposed by the present invention;

[0028] Figure 7 This is a structural assembly diagram of a filling gun in a hydrogen filling device proposed by the present invention;

[0029] Figure 8 for Figure 7 The enlarged view of point A in the middle;

[0030] Fig. 9 This is a structural cross-sectional view of a purge assembly in a hydrogen filling device proposed by the present invention.

[0031] In the figure: 1. container; 2. hydrogen compressor; 3. filling machine; 4. hydrogen storage tank; 5. nitrogen storage tank; 6. heat dissipation port; 7. filling gun; 8. hydrogen filling pipe; 9. hydrogen transmission pipeline; 10. oil cooling radiator; 11. nitrogen heating chamber; 12. heat transfer pipeline; 13. nitrogen transmission pipeline; 14. purge head; 15. purge pipe; 16. liquid filling port; 17. heating pipe; 18. heating net; 19. valve; 20. installation groove; 21. positioning groove; 22. sealing shell; 23. insulation pad; 24. positioning block; 25. slot; 26. clamp; 27. air duct; 28. air outlet. DETAILED DESCRIPTION

[0032] The technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

[0033] In the description of the present invention, it should be noted that the terms "upper", "lower", "inner", "outer", "top / bottom" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific position, be constructed and operated in a specific position, and therefore cannot be understood as limiting the present invention. In addition, the terms "first" and "second" are used for descriptive purposes only and cannot be understood as indicating or implying relative importance.

[0034] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "provided with", "mounted / connected", "connected", etc. should be understood in a broad sense. For example, "connected" can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0035] Example, see Figures 1 to 9 A hydrogen filling device includes a container 1 in which a storage tank unit, a hydrogen compressor 2 and a filling machine 3 are arranged, the storage tank unit includes a hydrogen storage tank 4 and a nitrogen storage tank 5, and the hydrogen storage tank 4 and the nitrogen storage tank 5 are arranged in parallel at one end of the container 1;

[0036] The output end flange of the hydrogen storage tank 4 is connected to the hydrogen delivery pipeline 9, the output end of the hydrogen delivery pipeline 9 is flange-connected to the input end flange of the hydrogen compressor 2, the output end of the hydrogen compressor 2 is flange-connected to the hydrogen input end flange of the filling machine 3, and the hydrogen output end of the filling machine 3 is fixedly connected to the input end of the hydrogen filling pipe 8;

[0037] The hydrogen compressor 2 is located at the other end of the container 1. The hydrogen compressor 2 includes a heat dissipation port 6, and a waste heat utilization component is provided at the heat dissipation port 6;

[0038] The waste heat utilization component includes an oil cooling radiator 10. A nitrogen heating chamber 11 is arranged on one side of the oil cooling radiator 10 away from the hydrogen compressor 2. A heat conducting pipe 12 is fixedly connected to the oil cooling radiator 10 toward the nitrogen heating chamber 11. The heat conducting pipe 12 is located in the nitrogen heating chamber 11. Both ends of the nitrogen heating chamber 11 are flange-connected with a nitrogen delivery pipe 13. The input end of the nitrogen delivery pipe 13 is flange-connected with the input end of the nitrogen storage tank 5. The output end of the nitrogen delivery pipe 13 is flange-connected with the nitrogen input end of the filling machine 3. The nitrogen output end of the filling machine 3 is connected with the input end of the purge component.

[0039] The filling machine 3 is located on the lower surface of the outside of the container 1 near the hydrogen compressor 2. A filling gun 7 is provided on the outer wall of the filling machine 3. A purge assembly is provided inside the filling gun 7. A hydrogen filling pipe 8 is provided at the input end of the filling gun 7.

[0040] The purge assembly includes a purge head 14 and a purge tube 15. The input end of the purge tube 15 is fixedly connected to the nitrogen output end of the filling machine 3, and the output end of the purge tube 15 is fixedly connected to the input end of the purge head 14. The purge head 14 is fixedly installed at the output end of the filling gun 7, and the input end of the purge head 14 is fixedly connected to the output end of the purge tube 15.

[0041] Furthermore, a liquid injection port 16 is provided at the top of the nitrogen heating chamber 11, a vacuum layer is provided at the inner wall of the nitrogen heating chamber 11, heating pipes 17 are fixedly connected at both ends of the interior of the nitrogen heating chamber 11, the heat conducting pipe 12 is connected with the pipe of the oil cooling radiator 10 so that the coolant that has absorbed the working heat of the hydrogen compressor 2 enters the heat conducting pipe 12, and the heat generated by the hydrogen compressor 2 is conducted to the heat conducting pipe 12 through the coolant, and a plurality of heating nets 18 are fixedly connected in the heating pipe 17 to increase the heating rate of the nitrogen;

[0042] The advantage of adopting the above structure is that liquid for heat storage can be added to the nitrogen heating chamber 11 through the liquid filling port 16, and the heat generated by the hydrogen compressor 2 during operation can be transferred to the liquid in the nitrogen heating chamber 11 through the oil cooling radiator 10 through the heat conducting pipe 12, and the heating pipe 17 and the heating network 18 are heated by the liquid in the nitrogen heating chamber 11, and the nitrogen is heated by the heating network 18, so that the heat generated by the hydrogen compressor 2 can be recovered for heating the nitrogen;

[0043] Further, the filling gun 7 includes a valve 19, an outer wall of the filling gun 7 is provided with an open mounting groove 20 at the valve 19, a plurality of positioning grooves 21 are provided on the surfaces at both ends of the mounting groove 20, a plurality of sealing shells 22 are provided at the mounting groove 20, the sealing shells 22 are relatively arranged at the mounting groove 20, an insulation pad 23 is fixedly connected to the inner wall of the sealing shell 22, a positioning block 24 is fixedly connected to the inner wall of the sealing shell 22 corresponding to the positioning groove 21, one of the sealing shells 22 is provided with a slot 25 on the side facing the valve 19, the other sealing shell 22 is fixedly connected with a clamping head 26 at the slot 25, a through hole is provided at the sealing shell 22 corresponding to the valve 19, the size of the clamping head 26 is larger than the slot 25, so that the clamping head 26 and the slot 25 are interference fit after clamping to increase the connection firmness;

[0044] The advantage of adopting the above structure is that after the sealing shells 22 are mutually engaged, the displacement of the sealing shells 22 can be avoided by plugging the positioning block 24 into the positioning groove 21, and the heat preservation pad 23 and the installation groove 20 together form a heat preservation cavity to hinder heat conduction and avoid heat loss of nitrogen in the purge pipe 15;

[0045] Further, the portion of the purge pipe 15 located in the mounting groove 20 is exposed and surrounds the valve 19, and is used to heat the valve 19 portion of the filling gun 7 to prevent the valve 19 from freezing inside;

[0046] Furthermore, an air duct 27 is provided in the purge head 14, and a plurality of air outlet holes 28 are provided at the output end of the purge head 14 corresponding to the filling gun 7 for the heated nitrogen to be discharged, so as to purge the output end of the filling gun 7 during filling;

[0047] The advantage of adopting the above structure is that when the heated nitrogen enters the part surrounded by the purge pipe 15, the valve 19 of the filling gun 7 is heated by the heat of the nitrogen, and then discharged from the air outlet 28 to purge the output end of the filling gun 7, thereby avoiding freezing of the inside of the valve 19 and the joint of the filling gun 7. The nitrogen discharged from the air outlet 28 mixes with the air in the filling area, reducing the oxygen concentration in the filling area, avoiding the leakage of hydrogen at the joint of the filling gun 7 and the oxygen in the air to the explosion ratio, and improving the safety during the filling process.

[0048] When the present invention is used, a worker manually takes out the filling gun 7 and connects it to the filling port of the car, and then opens the valve 19 of the filling gun 7 for filling. When filling, the hydrogen storage tank 4 and the nitrogen storage tank 5 are opened through the electromagnetic valve in the prior art, and the high-pressure gas in the hydrogen storage tank 4 and the nitrogen storage tank 5 is output according to the principle of minimum energy. The hydrogen in the hydrogen storage tank 4 enters the hydrogen compressor 2 along the hydrogen transmission pipeline 9, and then is output from the hydrogen compressor 2 to the hydrogen input end of the filling machine 3. In the process of the hydrogen compressor 2 outputting to the filling machine 3, the hydrogen is precooled to -40°C through the heat exchanger in the prior art, and then enters the filling gun 7 through the hydrogen filling pipe 8 and is injected into the hydrogen storage tank of the vehicle through the filling gun 7;

[0049] Similarly, the high-pressure gas in the nitrogen storage tank 5 enters the nitrogen heating chamber 11 through the nitrogen delivery pipeline 13, then is output from the nitrogen heating chamber 11 through the nitrogen delivery pipeline 13 and enters the nitrogen input end of the filling machine 3, and then enters the purge head 14 through the purge pipe 15;

[0050] The heat generated by the hydrogen compressor 2 during operation is conducted to the oil cooling radiator 10, and then to the heat conducting pipe 12 through the oil cooling radiator 10, and then to the liquid in the nitrogen heating chamber 11 through the heat conducting pipe 12, and the liquid is kept warm through the vacuum layer of the nitrogen heating chamber 11. The liquid in the nitrogen heating chamber 11 conducts the heat to the heating pipe 17, and then the heating pipe 17 conducts the heat to the heating net 18, and the nitrogen passing through the heating pipe 17 is heated. The contact area with the nitrogen is increased through the heating net 18, thereby improving the heating efficiency, and realizing the function of recovering the heat generated by the hydrogen compressor 2 to heat the nitrogen;

[0051] When the heated nitrogen enters the surrounding part of the purge pipe 15, the gun body of the filling gun 7 is heated by the heat of the nitrogen. Because the surrounding part of the purge pipe 15 is located in the sealing shell 22, and after the sealing shells 22 are clamped together, the insulation pad 23 and the mounting groove 20 jointly form an insulation cavity to hinder heat conduction, thereby preventing the heat of the nitrogen in the purge pipe 15 from being conducted to the air through the sealing shell 22, further improving the heating efficiency, and preventing the gun body of the filling gun 7 and the valve 19 from freezing, thereby preventing the valve 19 from being stuck due to freezing and preventing frostbite on the hands of the staff;

[0052] After the heated nitrogen enters the air duct 27 in the purge head 14, it is blown out from each air outlet 28 under the action of pressure to purge the output end of the filling gun 7 to prevent the connection between the filling gun 7 and the vehicle hydrogen filling port from freezing. At the same time, the condensed water droplets here are blown out, so that the blown nitrogen is mixed with the air in the filling area, reducing the oxygen concentration in the filling area, and avoiding the leakage of hydrogen at the connection point of the filling gun 7 and mixing with oxygen in the air to an explosive ratio. At the same time, because nitrogen is an inert gas, it is not flammable or explosive, which improves the safety during filling, and there is no need to use a leak detector for real-time detection.

[0053] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes according to the technical scheme and inventive concept of the present invention within the technical scope disclosed by the present invention, which should be covered by the protection scope of the present invention.

Claims

1. A hydrogen filling device, comprising a container (1) in which a storage tank unit, a hydrogen compressor (2) and a filling machine (3) are arranged, characterized in that: The storage tank unit comprises a hydrogen storage tank (4) and a nitrogen storage tank (5), the hydrogen storage tank (4) and the nitrogen storage tank (5) are arranged in parallel at one end inside the container (1), the hydrogen compressor (2) is located at the other end inside the container (1), the hydrogen compressor (2) comprises a heat dissipation port (6), a waste heat utilization component is arranged at the heat dissipation port (6), the filling machine (3) is located at the lower surface of the outside of the container (1) near the hydrogen compressor (2), a filling gun (7) is arranged on the outer side wall of the filling machine (3), a purge component is arranged inside the filling gun (7), and a hydrogen filling pipe (8) is arranged at the input end of the filling gun (7); The output end of the hydrogen storage tank (4) is flange-connected to a hydrogen delivery pipeline (9), the output end of the hydrogen delivery pipeline (9) is flange-connected to the input end of the hydrogen compressor (2), the output end of the hydrogen compressor (2) is flange-connected to the hydrogen input end of the filling machine (3), and the hydrogen output end of the filling machine (3) is fixedly connected to the input end of the hydrogen filling pipe (8); The waste heat utilization component comprises an oil cooling radiator (10), a nitrogen heating chamber (11) is arranged on a side of the oil cooling radiator (10) away from the hydrogen compressor (2), a heat conducting pipeline (12) is fixedly connected to the oil cooling radiator (10) facing the nitrogen heating chamber (11), the heat conducting pipeline (12) is located in the nitrogen heating chamber (11), and the nitrogen heating chamber (11) is flange-connected to nitrogen delivery pipelines (13) at both ends, the input end of the nitrogen delivery pipeline (13) is flange-connected to the input end of the nitrogen storage tank (5), the output end of the nitrogen delivery pipeline (13) is flange-connected to the nitrogen input end of the filling machine (3), and the nitrogen output end of the filling machine (3) is connected to the input end of the purge component; The purge assembly comprises a purge head (14) and a purge pipe (15); the input end of the purge pipe (15) is fixedly connected to the nitrogen output end of the filling machine (3); the output end of the purge pipe (15) is fixedly connected to the input end of the purge head (14); the purge head (14) is fixedly mounted on the output end of the filling gun (7); the input end of the purge head (14) is fixedly connected to the output end of the purge pipe (15).

2. A hydrogen filling device according to claim 1, characterized in that: A liquid injection port (16) is provided at the top of the nitrogen heating chamber (11), a vacuum layer is provided at the inner wall of the nitrogen heating chamber (11), heating pipes (17) are fixedly connected at both ends of the interior of the nitrogen heating chamber (11), and the heat conduction pipeline (12) is connected to the pipeline of the oil cooling radiator (10) so that coolant enters the heat conduction pipeline (12).

3. A hydrogen filling device according to claim 2, characterized in that: A plurality of heating nets (18) are fixedly connected inside the heating tube (17) and are used to increase the heating rate of the nitrogen.

4. A hydrogen filling device according to claim 1, characterized in that: The filling gun (7) comprises a valve (19), an outer wall of the filling gun (7) is provided with an open mounting groove (20) at the valve (19), a plurality of positioning grooves (21) are provided on the surfaces at both ends of the mounting groove (20), and a plurality of sealing shells (22) are provided at the mounting groove (20).

5. A hydrogen filling device according to claim 4, characterized in that: The sealing shell (22) is arranged relative to the mounting groove (20), a heat-insulating pad (23) is fixedly connected to the inner wall of the sealing shell (22), a positioning block (24) is fixedly connected to the inner wall of the sealing shell (22) corresponding to the positioning groove (21), a clamping groove (25) is provided on a side of one of the sealing shells (22) facing the valve (19), and a clamping head (26) is fixedly connected to the other sealing shell (22) corresponding to the clamping groove (25).

6. A hydrogen filling device according to claim 5, characterized in that: A through hole is provided in the sealing shell (22) at a position corresponding to the valve (19); the size of the clamping head (26) is larger than the clamping groove (25), so that the clamping head (26) and the clamping groove (25) are interference-fitted after being clamped.

7. A hydrogen filling device according to claim 6, characterized in that: The portion of the purge pipe (15) located in the mounting groove (20) is exposed and surrounds the valve (19), and is used to heat the valve (19) portion of the filling gun (7) to prevent it from freezing.

8. A hydrogen filling device according to claim 1, characterized in that: An air duct (27) is provided in the purge head (14), and a plurality of air outlet holes (28) are provided at the output end of the purge head (14) corresponding to the filling gun (7) for discharging heated nitrogen, and are used to purge the output end of the filling gun (7) during filling.

Images