Hydrogen station hydrogen storage device for pressure equalization

Abstract

The present application relates to hydrogen storage technology field, specifically to a kind of hydrogen station hydrogen storage device of equalizing pressure, including hydrogen storage tank, constant pressure tank, filling assembly, cooling assembly and drive switching mechanism, for solving the temperature rise and pressure fluctuation problem caused by Joule-Thomson effect in the process of hydrogen filling, hydrogen enters hydrogen delivery pipe when jacking free piston, heat is conducted to cooling pipe side wall;The rotating disc of drive switching mechanism periodically switches hydrogen delivery pipe, so that the heating line is communicated with the common inner cavity, and the gas pump is extracted back into hydrogen storage tank, while free piston falls and makes water body fill cooling pipe to carry out forced cooling, constant pressure tank is connected with annular main pipe, to ensure that hydrogen delivery pressure is constant, the device is through alternate heating and cooling cycle and multi-line switching mechanism, significantly inhibit hydrogen expansion temperature rise, while equalizing hydrogen delivery pressure, improve hydrogenation efficiency and equipment reliability.

Description

Technical Field

[0001] This invention relates to the field of hydrogen storage technology, and more specifically to a hydrogen storage device for a hydrogen refueling station that balances pressure. Background Technology

[0002] Hydrogen storage equipment at hydrogen refueling stations is a core component of hydrogen energy infrastructure. It stores high-pressure hydrogen and rapidly refills vehicle cylinders with hydrogen through a refueling system. Its core functions include high-pressure hydrogen storage, dynamic pressure regulation, temperature control, and continuous and stable hydrogen supply to ensure the safety and efficiency of the refueling process. In traditional hydrogen storage equipment at hydrogen refueling stations, hydrogen needs to pass through a multi-stage compression and cooling system to mitigate the Joule-Thomson effect when it is transported from the storage tank to the vehicle cylinder. Existing technologies generally use throttle valves to depressurize the hydrogen in stages and external heat exchangers (such as water cooling or air cooling) to cool the hydrogen pipeline. However, the cooling efficiency is limited by the heat conduction rate and it is difficult to cope with the intermittent temperature rise caused by frequent refueling. At the same time, it relies on a single hydrogen pipeline for cyclic operation, which causes local areas to be subjected to high pressure and high temperature for a long time, which can easily lead to material fatigue and leakage risks.

[0003] However, during the rapid charging process of hydrogen, the filling gas enters the cylinder from the hydrogen storage tank via the filling device, resulting in the Joule-Thomson effect (adiabatic throttling temperature effect). Unlike common gases (such as ammonia), hydrogen, due to the intermolecular forces, experiences a significant temperature increase after pressure reduction following throttling (typically 40-60°C). Although traditional technologies maintain the pressure at the hydrogen storage tank end through a constant-pressure tank, the hydrogen still undergoes a pressure reduction process in the filling pipeline (e.g., from 70 MPa to 35 MPa), making expansion and temperature rise unavoidable. For example, document CN115823472A discloses a high-pressure hydrogen storage system and method for rapid constant-pressure charging, including a hydrogen-related device and an auxiliary constant-pressure device. The hydrogen-related device includes a hydrogen storage tank, a hydrogen filling pipeline, a hydrogen discharging pipeline, and a two-position three-way solenoid valve for storing and charging / discharging hydrogen. The auxiliary constant-pressure device includes a hydraulic pump, a hydraulic oil tank, a sealing piston, a height sensor, and a shut-off valve, enabling the hydrogen charging process to be carried out under constant pressure. Although the auxiliary constant-pressure device... The constant pressure device (which first inputs hydraulic oil into the hydrogen storage tank to maintain constant pressure) achieves constant pressure output during the hydrogen fast charging process. However, it fails to solve the problem of expansion and temperature rise caused by the pressure drop when hydrogen is filled from the storage tank to the cylinder. The hydrogen still undergoes a pressure drop process during the hydrogen transport path, and the heat generated is only transferred to the hydraulic oil in the elastic air bladder. The heat is indirectly transferred to the hydrogen storage tank through the hydraulic oil, which still requires external heat dissipation devices. It does not substantially reduce the temperature of hydrogen during filling and has certain defects. Therefore, it is necessary to develop a hydrogen storage device for hydrogen refueling stations with balanced pressure. Summary of the Invention

[0004] To address the aforementioned deficiencies and problems, this invention provides a hydrogen storage device for hydrogen refueling stations with balanced pressure. Its purpose is to solve the temperature rise problem caused by the Joule-Thomson effect during hydrogen filling by the synergistic effect of the drive switching mechanism and cooling components, thereby improving hydrogen refueling efficiency through alternating cooling of the hydrogen pipeline and balanced hydrogen delivery pressure.

[0005] The solution adopted by this invention to solve its technical problem is as follows: a hydrogen storage device for a hydrogen refueling station with balanced pressure, comprising a hydrogen storage tank, a constant pressure tank, and a refueling assembly, and further comprising a cooling assembly, a fixed base, and a drive switching mechanism. The cooling assembly includes a water tank, cooling pipes, a hydrogen delivery pipe, and a ring main pipe. Several cooling pipes are connected to the bottom of the water tank. Free pistons are fitted onto the cooling pipes. The bottom of the cooling pipes is connected to the hydrogen delivery pipe, which is connected to the interior of the fixed base. Branch pipes are radially connected to the side of the hydrogen delivery pipe, and each branch pipe is connected to the ring main pipe. A one-way valve is installed on the branch pipe to allow the hydrogen delivery pipe to unidirectionally deliver gas to the ring main pipe. The constant pressure tank is connected to the refueling assembly and the ring main pipe through pipelines. The fixed base consists of a base plate and a sealing shell. An inner lining disc is fixedly fitted on the top of the fixed base, and through holes corresponding to the hydrogen delivery pipes are evenly distributed on the inner lining disc. The drive switching mechanism includes a turntable, a hollow shaft, a motor, a rotary joint, a hydrogen inlet pipe, and a gas pump. The hollow shaft rotates... The rotating assembly is housed within a fixed base. The turntable is positioned below the inner lining disc and fixedly mounted on the hollow shaft. The turntable and the inner lining disc are sealed together. The turntable has radially arranged docking grooves and several through holes. The docking grooves are connected to the interior of the hollow shaft via hydrogen inlet pipes. The motor is driven by the hollow shaft, which is connected to the hydrogen storage tank via a rotary joint. A common inner cavity is formed between the turntable and the fixed base, and a gas pump is connected to this common inner cavity via a pipeline. When the docking groove of the turntable is connected to the hydrogen delivery pipe, the free piston in the cooling pipe is pushed upward by hydrogen gas, transferring the heat generated by the hydrogen to the cooling pipe. When the turntable rotates, the docking groove connects to the next hydrogen delivery pipe, and the through holes connect to the previous hydrogen delivery pipe containing hydrogen gas, the hydrogen gas in the delivery pipe is pumped back to the hydrogen storage tank by the gas pump. Simultaneously, the free piston in the cooling pipe falls, allowing water to fill the cooling pipe and cool both the cooling pipe and the hydrogen delivery pipe.

[0006] The beneficial effects of this invention are: (1) Through the linkage design of the turntable driven by the motor and the hollow shaft, the docking groove and through hole on the turntable constitute a rotary hydrogen transport channel switching mechanism. When the turntable rotates and the docking groove is aligned with a specific hydrogen transport pipe, hydrogen is output through the hollow shaft, the hydrogen inlet pipe, the docking groove and the hydrogen transport pipe. When the through hole is aligned with the previous hydrogen transport pipe, the hydrogen transport pipe is connected to the common inner cavity, triggering the hydrogen reflux cooling process. (2) By setting up a constant pressure tank, when the turntable switching causes the hydrogen pipeline to be interrupted for a short time, the constant pressure tank continues to supply hydrogen to the main pipeline, avoiding pressure fluctuations during filling. The hydrogen pressure output from the hydrogen pipeline is transmitted to the constant pressure tank through the ring main pipeline. The constant pressure characteristic of the constant pressure tank can offset the local pressure changes caused by the movement of the free piston, and achieve balanced pressure hydrogen supply. (3) It can suppress the temperature rise caused by the Joule-Thomson effect during hydrogen filling. During the hydrogen output stage, after the hydrogen pushes the free piston to the top of the cooling pipe, the hydrogen directly contacts the metal wall of the cooling pipe. The heat generated by the Joule-Thomson effect is quickly dissipated to the pipe wall through heat conduction. During the cooling stage, the free piston falls so that the water in the water tank completely fills the cooling pipe, maximizing the contact area between the water and the pipe wall. The water absorbs the heat stored in the pipe wall to achieve cooling and cooling of the cooling pipe and the hydrogen delivery pipe. Furthermore, through the switching of the turntable, each hydrogen delivery pipe periodically enters the cooling state, avoiding local continuous heating and having an alternating cooling cycle effect.

[0007] (4) At the same time, only one hydrogen supply pipe is in the hydrogen supply state, while the other hydrogen supply pipes are in the cooling or standby state to avoid concentrated heat generation. By using the periodic switching of the turntable, the heat load on each hydrogen supply pipe is evenly distributed, extending the equipment life. In addition, each branch pipe of the hydrogen supply pipe is equipped with a one-way valve to ensure that hydrogen can only be output in one direction through the ring main pipe. Attached Figure Description

[0008] Figure 1 This is one of the schematic diagrams of the overall structure of the present invention.

[0009] Figure 2 This is one of the structural schematic diagrams of the cooling component of the present invention.

[0010] Figure 3 This is one of the structural schematic diagrams of the cooling assembly and mounting base.

[0011] Figure 4 This is the second structural schematic diagram of the cooling assembly and mounting base.

[0012] Figure 5 This is one of the internal sectional views of the fixed base.

[0013] Figure 6 This is the second internal sectional view of the fixed base.

[0014] Figure 7 An exploded view of the drive switching mechanism.

[0015] In the diagram: 1-Hydrogen storage tank, 2-Constant pressure tank, 3-Refilling assembly, 31-Main manifold, 32-Refilling valve port, 4-Cooling assembly, 41-Water tank, 42-Cooling pipe, 43-Free piston, 44-Hydrogen delivery pipe, 45-Annular main manifold, 46-Branch pipe, 47-One-way valve, 48-Heat dissipation fins, 5-Fixed seat, 51-Base plate, 52-Sealing shell, 53-Inner lining disc, 54-Through hole, 55-Common inner cavity, 6-Drive switching mechanism, 61-Turntable, 62-Mating groove, 63-Through hole, 64-Hollow shaft, 65-Motor, 66-Rotary joint, 67-Hydrogen inlet pipe, 68-Gas pump, 7-Auxiliary sealing assembly, 71-Outer ring sealing layer, 72-Inner ring sealing layer, 73-Radial sealing layer. Detailed Implementation

[0016] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0017] Example 1: In the existing hydrogen filling process, a throttle valve is generally used to reduce the pressure of hydrogen in stages, and an external heat exchanger (such as water cooling or air cooling) is used to cool the hydrogen transmission pipeline. However, the cooling efficiency is limited by the heat conduction speed and it is difficult to cope with the intermittent temperature rise during frequent filling. At the same time, it relies on a single hydrogen transmission pipeline to work in a cycle, which causes local areas to be subjected to high pressure and high temperature for a long time, which can easily lead to material fatigue and leakage risks. Although the existing technology maintains the pressure at the hydrogen storage tank end through a constant pressure tank, it fails to solve the problem of expansion and temperature rise caused by the pressure drop when hydrogen is filled from the hydrogen storage tank to the gas cylinder.

[0018] To address the aforementioned issues, this embodiment provides a hydrogen storage device for a hydrogen refueling station with balanced pressure, comprising a hydrogen storage tank 1, a constant pressure tank 2, a filling assembly 3, a cooling assembly 4, a fixed base 5, and a drive switching mechanism 6. The device aims to solve the temperature rise problem caused by the Joule-Thomson effect during hydrogen filling by using the synergistic effect of the drive switching mechanism 6 and the cooling assembly 4. It also provides alternating cooling of the hydrogen delivery pipe 44 and balanced hydrogen delivery pressure, thereby improving hydrogen refueling efficiency.

[0019] like Figure 2-6As shown, the cooling assembly 4 includes a water tank 41, cooling pipes 42, hydrogen delivery pipes 44, and annular main pipe 45. Several cooling pipes 42 are connected in a cross shape at the bottom of the water tank 41, and a free piston 43 is installed inside the cooling pipe 42. In the initial state, the free piston 43 inside the cooling pipe 42 is pressed to the bottom of the cooling pipe 42 by the water pressure in the water tank 41. The bottom of the cooling pipe 42 is provided with a lower ring support for the free piston 43, and the top of the cooling pipe 42 is provided with an upper ring support for limiting the free piston 43. The water inside the water tank 41 can fill the cooling pipe 42. The bottom of the cooling pipe 42 is sealed and connected to the hydrogen supply pipe 44. The hydrogen supply pipe 44 is connected to the inside of the fixed base 5, and a branch pipe 46 is radially connected to the side of each hydrogen supply pipe 44. A one-way valve 47 is provided on the branch pipe 46, and each branch pipe 46 is connected to the annular main pipe 45. Under the action of the one-way valve 47, each hydrogen supply pipe 44 only delivers hydrogen to the annular main pipe 45 in one direction through the branch pipe 46. Only when the docking groove 62 of the turntable 61 is docked and connected with the hydrogen supply pipe 44 can the hydrogen supply pipe 44 deliver hydrogen to the annular main pipe 45. The one-way valves 47 of the branch pipes 46 of the other hydrogen supply pipes 44 are in the closed state.

[0020] like Figure 1 As shown, the refueling assembly 3 includes a main pipe 31 and refueling valve ports 32. The constant pressure tank 2 is connected to the annular main pipe 45 and the main pipe 31 respectively through a three-way pipe. The refueling valve ports 32 are evenly distributed on the main pipe 31. The refueling valve ports 32 are connected to the hydrogen dispenser of the hydrogen refueling station through pipelines. The hydrogen in the annular main pipe 45 can be simultaneously delivered to the constant pressure tank 2 (which only provides constant pressure function; the constant pressure tank 2 is existing technology and will not be described in detail here) and the main pipe 31.

[0021] like Figure 5-6 As shown, the fixing base 5 consists of a base plate 51 and a sealing shell 52. A through hole corresponding to the hydrogen delivery pipe 44 is opened on the top of the sealing shell 52. An inner liner disc 53 is fixedly fitted inside the fixing base 5. Through holes 54 corresponding to the hydrogen delivery pipe 44 are evenly distributed on the inner liner disc 53. The diameter of the through holes 54 is smaller than the docking groove 62 and the through hole 63 of the turntable 61. The diameter of the through holes 54 is also smaller than the diameter of the hydrogen delivery pipe 44, so that the inner liner disc 53 has the effect of a pressure reducing valve.

[0022] like Figure 5-7 As shown, the drive switching mechanism 6 includes a turntable 61, a hollow shaft 64, a motor 65, a rotary joint 66, a hydrogen inlet pipe 67, and an air pump 68. The hollow shaft 64 is rotatably mounted in the fixed seat 5, and the top and bottom of the hollow shaft 64 extend out of the fixed seat 5. The top of the fixed seat 5 is provided with a sealed bearing cover that mates with the air shaft. The turntable 61 is fixedly mounted on the hollow shaft 64. The turntable 61 and the inner lining disc 53 have a sealed fit relationship. The turntable 61 has a radially formed mating groove 62 and several through holes 63.

[0023] Rotating the turntable 61 allows the docking groove 62 to connect with any hydrogen delivery pipe 44 through the through hole 54 of the inner liner disk 53. Rotating the turntable 61 also allows the docking groove 62 to be located in the area between adjacent through holes 54 on the inner liner disk 53, and the docking groove 62 is also located between adjacent hydrogen delivery pipes 44. At this time, the docking groove 62 of the turntable 61 is misaligned with the through hole 54 of the inner liner disk 53, so that the docking groove 62 is blocked by the inner liner disk 53 and the docking groove 62 is not connected with the hydrogen delivery pipe 44.

[0024] The docking groove 62 and the hollow shaft 64 are connected by a hydrogen inlet pipe 67. A mating channel is provided inside the turntable 61, which is located between the docking groove 62 and the hollow shaft 64. The hydrogen inlet pipe 67 is fitted into the mating channel, and its two ends are connected to the docking groove 62 and the hollow shaft 64, respectively. Hydrogen gas in the hollow shaft 64 can enter the docking groove 62 through the hydrogen inlet pipe 67 and then enter the hydrogen delivery pipe 44 through the docking groove 62.

[0025] The motor 65 is fixedly installed at the bottom of the fixed base 5. The hollow shaft 64 is connected to the output shaft of the motor 65 through gear transmission. The input end of the hollow shaft 64 is connected to the hydrogen storage tank 1 through the rotary joint 66. The rotary joint 66 can be the N206RJSF model ultra-high pressure rotary joint 66 of Zaozhuang Deweier Machinery Technology Co., Ltd., with a pressure bearing capacity of 100MPa, or it can be the Rotorfors rotary joint 66 A08-1602-09E of Xiamen Qianqiu Automation Technology Co., Ltd., with a pressure bearing capacity of 50.5 MPa.

[0026] A common inner cavity 55 is formed between the bottom of the turntable 61 and the fixed base 5, and the air pump 68 is connected to the common inner cavity 55 through a pipeline.

[0027] The docking groove 62 of the turntable 61 can dock with any hydrogen delivery pipe 44. Hydrogen gas will enter the hydrogen delivery pipe 44 and the cooling pipe 42, and lift the free piston 43 to the top of the cooling pipe 42. The hydrogen gas will directly contact the inner wall of the cooling pipe 42 and the hydrogen delivery pipe 44, and the heat generated by the Joule-Thomson effect will be quickly conducted through the metal pipe wall. At the same time, the hydrogen gas will enter the annular main pipe 45 through the hydrogen delivery pipe 44 and the branch pipe 46. The hydrogen gas in the annular main pipe 45 will be delivered to the constant pressure tank 2 and the main discharge pipe 31, and delivered to the hydrogen storage station's dispensing machine through the filling valve port 32 of the main discharge pipe 31.

[0028] When the turntable 61 rotates and the docking groove 62 aligns with the next hydrogen delivery pipe 44, the through hole 63 of the turntable 61 aligns with the previous hydrogen delivery pipe 44 containing hydrogen. At this time, the hydrogen delivery pipe 44 containing hydrogen is connected to the common inner cavity 55. Under the action of the one-way valve 47, the gas pump 68 pumps the hydrogen in the hydrogen delivery pipe 44 back to the hydrogen storage tank 1. At the same time, the free piston 43 in the cooling pipe 42 falls. The falling of the free piston 43 completely fills the cooling pipe 42 with water in the water tank 41, maximizing the contact area between the water and the pipe wall. The specific heat capacity of water is used to efficiently absorb the heat from the wall of the cooling pipe 42. At the same time, according to the heat conduction effect, the cooling pipe 42 and the hydrogen delivery pipe 44 are cooled and cooled simultaneously, realizing phase change enhanced cooling.

[0029] Each time the turntable 61 switches the hydrogen delivery pipe 44, the previous hydrogen delivery pipe 44 enters the cooling cycle.

[0030] Working process: When the turntable 61 rotates and connects the docking groove 62 with any one of the hydrogen supply pipes 44, hydrogen enters the docking groove 62 through the hollow shaft 64 and the hydrogen inlet pipe 67, and then enters the hydrogen supply pipe 44 through the through hole 54. At the same time, the hydrogen enters the cooling pipe 42, pressing the free piston 43 to the inner top of the cooling pipe 42. The heat generated by the hydrogen due to the Joule-Thomson effect is transferred to the side wall of the cooling pipe 42, and the hydrogen supply pipe 44 and the cooling pipe 42 will locally heat up. The upward movement of the free piston 43 enhances the effect of transferring the heat generated by the hydrogen to the side wall of the cooling pipe 42. At the same time, only one hydrogen supply pipe 44 is in the hydrogen supply state, while the other hydrogen supply pipes 44 are in the cooling or standby state to avoid concentrated heat generation.

[0031] Furthermore, through the constant pressure tank 2, when the turntable 61 rotates and the docking groove 62 is located between the adjacent through holes 54 of the inner lining disc 53, causing the hydrogen supply pipe 44 to be briefly interrupted, the constant pressure tank 2 continues to supply hydrogen to the main outlet pipe 31 to avoid pressure fluctuations during filling. Moreover, the hydrogen pressure output from the hydrogen supply pipe 44 is transmitted to the constant pressure tank 2 through the annular main pipe 45. The constant pressure characteristic of the constant pressure tank 2 is used to counteract the local pressure changes caused by the movement of the free piston 43, thereby achieving dynamic adjustment of the balanced pressure.

[0032] When the turntable 61 rotates, causing the docking groove 62 to disengage from the heated hydrogen delivery pipe 44 and connect with the next hydrogen delivery pipe 44, the through hole 63 of the turntable 61 will connect with the previous heated hydrogen delivery pipe 44. High-pressure hydrogen gas remains in the heated hydrogen delivery pipe 44 and the cooling pipe 42, preventing the free piston 43 from falling. However, at this time, the inside of the hydrogen delivery pipe 44 is connected to the common inner cavity 55. The air pump 68 extracts the residual hydrogen gas in the pipe through the common inner cavity 55. The returned hydrogen gas is pressurized by the air pump 68 and sent to the hydrogen storage tank 1. During the return process, the pressure in the cooling pipe 42 decreases, causing the free piston 43 to immediately move down under the action of gravity and water pressure. The water falls and fills the cooling pipe 42, and the heated cooling pipe 42 and the hydrogen delivery pipe 44 are cooled down by heat conduction. The through hole 54 of the inner lining disc 53 is smaller than the aperture of the hydrogen delivery pipe 44. When the hydrogen delivery pipe 44 flows back into the common inner cavity 55 of the fixed seat 5, the through hole 54 prevents the hydrogen from rushing into the common inner cavity 55. The flow rate of the hydrogen is reduced, so that the high-pressure hydrogen inside the hydrogen delivery pipe 44 will not enter the common inner cavity 55 quickly. Due to insufficient gas supply rate, the common inner cavity 55 will always be in a low pressure state.

[0033] The docking groove 62 of the turntable 61 connects with the hydrogen delivery pipe 44. When the hydrogen generates heat, causing the hydrogen delivery pipe 44 and the cooling pipe 42 to heat up, the turntable 61 rotates, causing the docking groove 62 to connect with the next hydrogen delivery pipe 44. At this time, the free piston 43 inside the heated cooling pipe 42 falls, allowing water to cool the heated cooling pipe 42 and the hydrogen delivery pipe 44. Each time the turntable 61 switches the hydrogen delivery pipe 44, the previous hydrogen delivery pipe 44 enters the cooling cycle, achieving an alternating cooling cycle effect, sequentially cooling the cooling pipe 42. The hydrogen delivery pipe 44 is cyclically cooled. For example, when the first hydrogen delivery pipe 44 heats up, the docking groove 62 of the turntable 61 rotates to the second hydrogen delivery pipe 44, and at the same time, the through hole 63 docks with the first hydrogen delivery pipe 44. The free piston 43 inside the cooling pipe 42 falls down, and the water cools the first hydrogen delivery pipe 44 and the cooling pipe 42. Continuing this process can achieve cyclic cooling of the hydrogen delivery pipe 44. The heating and cooling of the hydrogen delivery pipe 44 are alternating, which can fully cool down each heated hydrogen delivery pipe 44.

[0034] The feature of this application is that the free piston 43 can rise and fall. When the free piston 43 rises, the heat generated by the hydrogen can be transferred to the side wall of the cooling pipe 42. When the free piston 43 falls, the water can quickly occupy the cooling pipe 42 and cool down the side wall of the cooling pipe 42 and the side wall of the hydrogen delivery pipe 44 according to the heat conduction.

[0035] Preferably, considering the sealing effect between the turntable 61 and the inner lining disc 53, an auxiliary sealing component 7 is also provided on the top of the turntable 61. The auxiliary sealing component 7 includes an outer annular groove and an inner annular groove opened on the top of the turntable 61. The mating groove 62 and the through hole 63 are located between the outer annular groove and the inner annular groove. An outer annular sealing layer 71 and an inner annular sealing layer 72 are fitted in both the outer annular groove and the inner annular groove. Radial grooves are radially opened on both sides of the mating groove 62. A radial sealing layer 73 is fitted in the radial groove.

[0036] A heat dissipation fin 48 is also fixedly fitted on the outer periphery of the cooling pipe 42. When the free piston 43 is pressed upward, the heat dissipation fin 48 can assist in the heat dissipation of the cooling pipe 42.

[0037] Example 2, a hydrogen storage device for a hydrogen refueling station with equalized pressure, is described in this embodiment, focusing on the differences from that in Example 1.

[0038] In this embodiment, an auxiliary pressing component is provided, which includes a rotating sleeve. The rotating sleeve is fitted onto the hollow shaft 64 and is located between the gear and the turntable 61 of the hollow shaft 64. The rotating sleeve assists in supporting the turntable 61 and ensures the sealing relationship between the turntable 61 and the inner lining disc 53.

[0039] The above description is only a preferred embodiment of the present invention and does not limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A hydrogen storage device for a hydrogen refueling station with balanced pressure, comprising a hydrogen storage tank, a constant pressure tank, and a refueling assembly, characterized in that, It also includes a cooling assembly, a fixed base, and a drive switching mechanism. The cooling assembly includes a water tank, cooling pipes, a hydrogen delivery pipe, and a ring main pipe. Several cooling pipes are connected to the bottom of the water tank. Free pistons are fitted onto the cooling pipes. The bottom of the cooling pipes is connected to the hydrogen delivery pipe, which communicates with the interior of the fixed base. Branch pipes are radially connected to the side of the hydrogen delivery pipe. Each branch pipe is connected to the ring main pipe, and a one-way valve is installed on the branch pipe to allow the hydrogen delivery pipe to deliver gas unidirectionally to the ring main pipe. The constant pressure tank is connected to the filling assembly and the ring main pipe through pipelines. The fixed base consists of a base plate and a sealing shell. An inner liner disc is fixedly fitted at the top of the fixed base, and through holes corresponding to the hydrogen delivery pipes are evenly distributed on the inner liner disc. The drive switching mechanism includes a turntable, a hollow shaft, a motor, a rotary joint, a hydrogen inlet pipe, and a gas pump. The hollow shaft is rotatably fitted inside the fixed base, and the turntable is located below the inner liner disc and fixedly fitted. On the hollow shaft, the turntable and the inner lining disc are sealed together. The turntable has radially arranged docking grooves and several through holes. The docking grooves are connected to the interior of the hollow shaft through a hydrogen inlet pipe. The motor is driven by the hollow shaft, and the hollow shaft is connected to the hydrogen storage tank through a rotary joint. A common inner cavity is formed between the turntable and the fixed base, and the gas pump is connected to the common inner cavity through a pipeline. When the docking groove of the turntable is connected to the hydrogen delivery pipe, the free piston in the cooling pipe is pushed upward by the hydrogen gas and moves, transferring the heat generated by the hydrogen gas to the cooling pipe. When the turntable rotates to connect the docking groove with the next hydrogen delivery pipe and the through hole with the previous hydrogen delivery pipe containing hydrogen gas, the hydrogen gas in the hydrogen delivery pipe is pumped back to the hydrogen storage tank by the gas pump. At the same time, the free piston in the cooling pipe falls, and water can fill the cooling pipe, cooling and lowering the temperature of the cooling pipe and the hydrogen delivery pipe.

2. The hydrogen storage device for a hydrogen refueling station with balanced pressure according to claim 1, characterized in that, An auxiliary sealing assembly is provided on the top of the turntable. The auxiliary sealing assembly includes an outer annular groove and an inner annular groove on the top of the turntable. The mating groove and the through hole are located between the outer annular groove and the inner annular groove. An outer ring sealing layer and an inner ring sealing layer are fitted inside the outer annular groove and the inner annular groove, respectively. Radial grooves are provided on both sides of the mating groove, and radial sealing layers are fitted inside the radial grooves.

3. The hydrogen storage device for a hydrogen refueling station with balanced pressure according to claim 1, characterized in that, Heat dissipation fins are fixedly fitted on the outer periphery of the cooling pipe to assist in heat dissipation.

4. A hydrogen storage device for a hydrogen refueling station with equalized pressure according to claim 1, characterized in that, The refueling assembly includes a main pipe and refueling valve ports. The constant pressure tank is connected to the annular main pipe and the main pipe respectively through a three-way pipe. The refueling valve ports are evenly distributed on the main pipe and are connected to the hydrogen refueling machine of the hydrogen refueling station through pipelines.

5. A hydrogen storage device for a hydrogen refueling station with balanced pressure according to claim 1, characterized in that, The turntable has a mating channel inside, which is located between the docking groove and the hollow shaft. The hydrogen inlet pipe is fitted inside the mating channel, and the two ends of the hydrogen inlet pipe are connected to the docking groove and the hollow shaft, respectively.

6. A hydrogen storage device for a hydrogen refueling station with equalized pressure according to claim 1, characterized in that, The diameter of the through hole in the inner lining disk is smaller than the diameter of the cooling pipe and the hydrogen delivery pipe.

7. A hydrogen storage device for a hydrogen refueling station with equalized pressure according to claim 1, characterized in that, The motor is fixedly mounted at the bottom of the mounting base, and the hollow shaft is connected to the motor's output shaft via gear transmission.

8. A hydrogen storage device for a hydrogen refueling station with balanced pressure according to claim 7, characterized in that, It also includes an auxiliary pressing component, which includes a rotating sleeve. The rotating sleeve is fitted onto the hollow shaft and is located between the gear and the turntable on the hollow shaft. It assists in supporting the turntable and ensures the sealing relationship between the turntable and the inner lining disc.

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