Pressure-balanced hydrogen storage device of hydrogen refueling station

Abstract

The invention relates to the technical field of hydrogen storage, in particular to a pressure-balanced hydrogen refueling station hydrogen storage device which comprises a hydrogen storage tank, a constant pressure tank, a filling assembly, a cooling assembly and a driving switching mechanism and is used for solving the problems of temperature rise and pressure fluctuation caused by the Joule-Thomson effect in the hydrogen filling process. Heat is conducted to the side wall of the cooling pipe; a rotating disc of the switching mechanism is driven to periodically switch a hydrogen conveying pipe, so that a temperature rising pipeline is communicated with a public inner cavity, a gas pump pumps hydrogen back to a hydrogen storage tank, meanwhile, a free piston falls to enable a cooling pipe to be filled with water for forced cooling, and a constant-pressure tank is connected with an annular header pipe to ensure that the hydrogen conveying pressure is constant. And meanwhile, the hydrogen conveying pressure is balanced, and the hydrogenation efficiency and the equipment reliability are improved.

Description

Technical Field

[0001] The present invention relates to the technical field of hydrogen storage, and in particular to a pressure-equalizing hydrogen storage device for a hydrogen filling station. Background Art

[0002] The hydrogen storage equipment at hydrogen refueling stations is the core equipment in the hydrogen energy infrastructure. It is used to store high-pressure hydrogen and quickly fill the vehicle-mounted gas cylinders with hydrogen through the filling system. Its core functions include: high-pressure storage of hydrogen, dynamic pressure regulation, temperature control, and continuous and stable hydrogen supply to ensure the safety and efficiency of the filling process. In traditional hydrogen storage equipment at hydrogen refueling stations, when hydrogen is transported from the hydrogen storage tank to the vehicle gas cylinder, it is necessary to alleviate the Joule-Thomson effect through a multi-stage compression and cooling system. The existing technology generally uses a throttle valve to reduce the pressure of hydrogen in stages, and uses an external heat exchanger (such as water cooling or air cooling) to cool the hydrogen pipeline. However, the cooling efficiency is limited by the heat conduction speed, and it is difficult to cope with the intermittent temperature rise caused by frequent filling. At the same time, it relies on a single hydrogen pipeline to circulate, resulting in local areas being subjected to high pressure and high temperature for a long time, which is prone to material fatigue and leakage risks.

[0003] However, during the fast filling process of hydrogen, when the filling gas enters the gas cylinder from the hydrogen storage tank through the filling device, the Joule-Thomson effect (adiabatic throttling temperature effect) will be generated. Unlike general gases (such as ammonia), hydrogen will have a significant increase in temperature (typical temperature rise of 40-60°C) due to the characteristics of intermolecular forces after throttling. Although the traditional technology maintains the pressure at the end of the hydrogen storage tank through a constant pressure tank, the hydrogen still undergoes a pressure reduction process in the filling pipeline (such as from 70 MPa to 35 MPa), resulting in the unavoidable problem of expansion and temperature rise. For example, the document with the publication number "CN115823472A" discloses a high-pressure hydrogen storage system and method for constant pressure rapid filling, 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 discharge pipeline, and a two-position three-way solenoid valve for storing hydrogen and charging and discharging hydrogen; the auxiliary constant pressure device includes a hydraulic pump, a hydraulic oil tank, a sealing piston, a height sensor, and a stop valve, so that the hydrogen filling process can be carried out under a constant pressure environment. Although the auxiliary The constant pressure device (hydraulic oil is first input into the hydrogen storage tank to maintain constant pressure) realizes constant pressure output during the hydrogen fast filling process, but fails to solve the problem of expansion and heating caused by the reduction in air pressure when hydrogen is filled from the hydrogen storage tank to the gas cylinder. Hydrogen still undergoes a process of air pressure reduction in the hydrogen transmission path, and the heat generated is only transferred to the hydraulic oil of the elastic airbag. The heat is indirectly transferred to the hydrogen storage tank through the hydraulic oil, and still relies on external heat dissipation devices. It does not actually reduce the temperature of hydrogen during filling, and there are certain defects. Therefore, it is necessary to develop a hydrogen storage device for hydrogen filling stations with balanced pressure. Summary of the invention

[0004] In view of the above-mentioned defects and problems, the present invention provides a pressure-equalized hydrogen storage device for a hydrogen refueling station, the purpose of which is to solve the temperature rise problem caused by the Joule-Thomson effect during the hydrogen filling process through the synergistic effect of the driving switching mechanism and the cooling component, alternately cool the hydrogen transmission pipe and transport hydrogen with equalized pressure, and improve the hydrogenation efficiency.

[0005] The solution adopted by the present invention to solve its technical problems is: a hydrogen storage device for a hydrogen filling station with balanced pressure, including a hydrogen storage tank, a constant pressure tank and a filling assembly, and also including a cooling assembly, a fixed seat and a drive switching mechanism. The cooling assembly includes a water tank, a cooling pipe, a hydrogen delivery pipe and an annular main pipe. The bottom of the water tank is connected to a plurality of cooling pipes, and the cooling pipe is sleeved with a free piston. The bottom of the cooling pipe is connected to the hydrogen delivery pipe, and the hydrogen delivery pipe is communicated with the inside of the fixed seat. A branch pipe is radially connected to the side of the hydrogen delivery pipe, and each branch pipe is connected to the annular main pipe, and a one-way valve is arranged on the branch pipe to make the hydrogen delivery pipe transport gas to the annular main pipe in one direction; the constant pressure tank is connected to the filling assembly and the annular main pipe respectively through pipelines; the fixed seat is composed of a bottom plate and a sealing shell, and an inner lining disc is fixedly sleeved on the top of the fixed seat, and through holes corresponding to the hydrogen delivery pipe 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 an air pump, and the hollow shaft turns The movable sleeve is mounted in the fixed seat, the turntable is arranged below the liner disc and fixedly mounted on the hollow shaft, the turntable and the liner disc are sealed and matched, a docking groove and a plurality of through holes are radially arranged on the turntable, the docking groove is connected with the inside of the hollow shaft through a hydrogen inlet pipe, the motor is transmission-connected with the hollow shaft, and the hollow shaft is connected with the hydrogen storage tank through a rotary joint; a common inner cavity is formed between the turntable and the fixed seat, and the air pump is connected with the common inner cavity through a pipeline; when the docking groove of the turntable is docked and connected with the hydrogen transmission pipe, the free piston in the cooling pipe will be pressed upward by the hydrogen and the heat generated by the hydrogen will be transferred to the cooling pipe; when the turntable rotates to dock the docking groove with the next hydrogen transmission pipe and dock the through hole with the previous hydrogen transmission pipe with hydrogen inside, the hydrogen in the hydrogen transmission pipe will be pumped back to the hydrogen storage tank by the air pump, and at the same time the free piston in the cooling pipe will fall, the water body can fill the cooling pipe, and the cooling pipe and the hydrogen transmission pipe are cooled and cooled.

[0006] Beneficial effects of the present invention: (1) The motor-driven turntable and the hollow shaft are linked to each other. The docking grooves and through holes on the turntable constitute a rotary hydrogen transmission channel switching mechanism. When the turntable rotates and the docking groove is aligned with a specific hydrogen transmission tube, hydrogen is output through the hollow shaft, the hydrogen inlet tube, the docking groove and the hydrogen transmission tube. When the through hole is aligned with the previous hydrogen transmission tube, the hydrogen transmission tube is connected to the common inner cavity, triggering the hydrogen reflux cooling process. (2) Through the constant pressure tank, when the turntable switching causes the hydrogen transmission pipe to be temporarily disconnected, the constant pressure tank continues to supply hydrogen to the main discharge pipe, avoiding the filling pressure fluctuation. The hydrogen pressure output by the hydrogen transmission pipe is transmitted to the constant pressure tank through the annular main pipe. The constant pressure characteristics of the constant pressure tank can offset the local pressure changes caused by the movement of the free piston, thereby achieving balanced pressure hydrogen supply; (3) It can suppress the temperature rise caused by the Joule-Thomson effect generated by hydrogen filling. In the hydrogen output stage, after the hydrogen lifts the free piston to the top of the cooling tube, the hydrogen directly contacts the metal wall of the cooling tube. The heat generated by the Joule-Thomson effect is quickly dissipated to the tube wall through heat conduction. In the cooling stage, the free piston falls to make the water in the water tank completely fill the cooling tube, maximizing the contact area between the water and the tube wall. The water absorbs the heat stored in the tube wall to achieve cooling of the cooling tube and the hydrogen transmission tube. Moreover, by switching the turntable, each hydrogen transmission tube periodically enters the cooling state, avoiding local continuous temperature rise, and having an alternating cooling cycle effect.

[0007] (4) Only one hydrogen pipe is in the hydrogen supply state at the same time, and the other hydrogen pipes are in the cooling or standby state to avoid concentrated heat. By using the periodic switching of the turntable, the heat load on each hydrogen pipe is evenly distributed, extending the life of the equipment. A one-way valve is installed on the branch pipe of each hydrogen pipe to ensure that hydrogen can only be output in one direction through the ring main pipe. BRIEF DESCRIPTION OF THE DRAWINGS

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

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

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

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

[0012] Figure 5 This is one of the internal cross-sectional views of the fixed seat.

[0013] Figure 6 This is the second internal cross-sectional view of the fixed seat.

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

[0015] In the figure: 1-hydrogen storage tank, 2-constant pressure tank, 3-filling assembly, 31-main exhaust pipe, 32-filling valve port, 4-cooling assembly, 41-water tank, 42-cooling pipe, 43-free piston, 44-hydrogen delivery pipe, 45-annular main pipe, 46-branch pipe, 47-check valve, 48-heat dissipation ribs, 5-fixed seat, 51-bottom plate, 52-sealing shell, 53-lined disc, 54-through hole, 55-public inner cavity, 6-drive switching mechanism, 61-turntable, 62-docking groove, 63-through hole, 64-hollow shaft, 65-motor, 66-rotating joint, 67-hydrogen inlet pipe, 68-air pump, 7-auxiliary sealing assembly, 71-outer ring sealing layer, 72-inner ring sealing layer, 73-radial sealing layer. DETAILED DESCRIPTION

[0016] The present invention is further described below in conjunction with 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 the hydrogen transmission pipeline is cooled by an external heat exchanger (such as water cooling or air cooling). However, the cooling efficiency is limited by the heat conduction speed, and it is difficult to cope with the intermittent temperature rise caused by frequent filling. At the same time, it relies on a single hydrogen transmission pipeline to work in a cycle, resulting in a local area being subjected to high pressure and high temperature for a long time, which is prone to cause material fatigue and leakage risks. Although the pressure at the end of the hydrogen storage tank is maintained by a constant pressure tank in the existing technology, it fails to solve the problem of expansion and temperature rise caused by the reduction in gas pressure when hydrogen is filled from the hydrogen storage tank to the gas cylinder.

[0018] In response to the above problems, the present embodiment provides a pressure-equalized hydrogen storage device for a hydrogen filling station, comprising a hydrogen storage tank 1, a constant pressure tank 2, a filling assembly 3, a cooling assembly 4, a fixing seat 5 and a drive switching mechanism 6. The purpose is to solve the temperature rise problem caused by the Joule-Thomson effect during the hydrogen filling process through the synergistic effect of the drive switching mechanism 6 and the cooling assembly 4, alternately cool the hydrogen transmission pipe 44 and transport hydrogen with equalized pressure, thereby improving the hydrogenation efficiency.

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

[0020] like Figure 1 As shown, the filling assembly 3 includes a main discharge pipe 31 and a filling valve port 32. The constant pressure tank 2 is connected to the annular main pipe 45 and the main discharge pipe 31 respectively through a three-way pipe. The filling valve ports 32 are evenly distributed on the main discharge pipe 31. The filling valve ports 32 are connected to the hydrogen filling machine of the hydrogen filling station through a pipeline. The hydrogen in the annular main pipe 45 can be simultaneously transported to the constant pressure tank 2 (only provides a constant pressure effect, the constant pressure tank 2 is a prior art and will not be described in detail here) and the main discharge pipe 31.

[0021] like Figure 5-6 As shown, the fixing seat 5 is composed of a base plate 51 and a sealing shell 52, and a through hole corresponding to the hydrogen transmission pipe 44 is opened on the top of the sealing shell 52, and an inner lining disc 53 is fixedly mounted on the top of the fixing seat 5, and through holes 54 corresponding to the hydrogen transmission pipe 44 are evenly distributed on the inner lining disc 53, and the aperture of the through hole 54 is smaller than the docking groove 62 and the through hole 63 of the rotating disk 61, and the aperture of the through hole 54 is also smaller than the aperture of the hydrogen transmission pipe 44, so that the inner lining 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. A sealing bearing cover that matches the air shaft is provided on the top of the fixed seat 5. The turntable 61 is fixedly mounted on the hollow shaft 64. There is a sealing matching relationship between the turntable 61 and the liner disc 53. A docking groove 62 and a plurality of through holes 63 are radially opened on the turntable 61.

[0023] The rotation of the turntable 61 can make the docking groove 62 dock and connect with any one of the hydrogen transmission pipes 44 through the through hole 54 of the lining disc 53, and the rotation of the turntable 61 can also make the docking groove 62 be located in the area between adjacent through holes 54 on the lining disc 53, and at the same time, the docking groove 62 is also located between adjacent hydrogen transmission pipes 44. At this time, the docking groove 62 of the turntable 61 is misaligned with the through hole 54 of the lining disc 53, so that the docking groove 62 is blocked by the lining disc 53, and the docking groove 62 is not docked and connected with the hydrogen transmission pipe 44.

[0024] The docking groove 62 is connected to the inside of the hollow shaft 64 through the hydrogen inlet pipe 67. A matching channel is opened inside the turntable 61. The matching channel is located between the docking groove 62 and the hollow shaft 64. The hydrogen inlet pipe 67 is inserted into the matching channel. The two ends of the hydrogen inlet pipe 67 are respectively connected to the docking groove 62 and the inside of the hollow shaft 64. The hydrogen in the hollow shaft 64 can enter the docking groove 62 through the hydrogen inlet pipe 67, and enter the hydrogen transmission pipe 44 through the docking groove 62.

[0025] The motor 65 is fixedly installed at the bottom of the fixing seat 5, the hollow shaft 64 is connected to the output shaft of the motor 65 through a gear transmission, and the input end of the hollow shaft 64 is connected to the hydrogen storage tank 1 through a rotary joint 66. The rotary joint 66 can adopt the N206RJSF model ultra-high pressure rotary joint 66 of Zaozhuang Deweier Machinery Technology Co., Ltd., with a pressure bearing capacity of 100 MPa, or can also adopt the Rotofos 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 fixing seat 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 pipe 44, and the hydrogen will enter the hydrogen pipe 44 and the cooling pipe 42, and lift the free piston 43 to the top of the cooling pipe 42. The hydrogen is in direct contact with the inner walls of the cooling pipe 42 and the hydrogen pipe 44, and the heat generated by the Joule-Thomson effect is quickly conducted through the metal pipe wall; at the same time, the hydrogen enters the annular main pipe 45 through the hydrogen pipe 44 and the branch pipe 46, and the hydrogen in the annular main pipe 45 is simultaneously transported to the constant pressure tank 2 and the main discharge pipe 31, and is transported to the filling machine of the hydrogen storage station through the filling valve port 32 of the main discharge pipe 31.

[0028] When the turntable 61 rotates to make the docking groove 62 dock with the next hydrogen delivery pipe 44, the through hole 63 of the turntable 61 will dock with the previous hydrogen delivery pipe 44 with hydrogen stored inside. At this time, the hydrogen delivery pipe 44 with hydrogen stored inside is connected with the common inner cavity 55. Under the action of the one-way valve 47, the air pump 68 pumps the hydrogen in the hydrogen delivery pipe 44 back to the hydrogen storage tank 1, and at the same time makes the free piston 43 in the cooling pipe 42 fall. The falling of the free piston 43 makes the water in the water tank 41 completely fill the cooling pipe 42, and the contact area between the water and the pipe wall is maximized. The specific heat capacity advantage of water is used to efficiently absorb the heat of the cooling pipe 42 wall. At the same time, according to the heat conduction effect, the cooling pipe 42 and the hydrogen delivery pipe 44 are cooled synchronously to achieve phase change enhanced cooling.

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

[0030] Working process: when the turntable 61 rotates to connect the docking groove 62 with any one of the hydrogen pipes 44, hydrogen enters the docking groove 62 through the hollow shaft 64 and the hydrogen inlet pipe 67, and then enters the hydrogen pipe 44 through the through hole 54. At the same time, 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 Joule-Thomson effect of the hydrogen is transferred to the side wall of the cooling pipe 42, and the hydrogen pipe 44 and the cooling pipe 42 are locally heated. The upward movement of the free piston 43 is used to enhance 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 pipe 44 is in the hydrogen supply state, and the other hydrogen pipes 44 are in the cooling or standby state to avoid concentrated heat.

[0031] Furthermore, by means of the set constant pressure tank 2, when the turntable 61 rotates so that the docking groove 62 is located between the adjacent through holes 54 of the lining disc 53, resulting in a temporary interruption of flow in the hydrogen delivery pipe 44, the constant pressure tank 2 continues to supply hydrogen to the main discharge pipe 31 to avoid fluctuations in the filling pressure, and the hydrogen pressure output by the hydrogen delivery pipe 44 is transmitted to the constant pressure tank 2 through the annular main pipe 45, and the constant pressure characteristics of the constant pressure tank 2 are used to offset 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 to disengage the docking groove 62 from the heated hydrogen delivery pipe 44 and dock with the next hydrogen delivery pipe 44, the through hole 63 of the turntable 61 will dock with the previous heated hydrogen delivery pipe 44, and high-pressure hydrogen will remain in the heated hydrogen delivery pipe 44 and the cooling pipe 42, causing the free piston 43 to be unable to fall. However, at this time, the interior of the hydrogen delivery pipe 44 is connected to the common inner cavity 55, and the air pump 68 extracts the residual hydrogen in the pipeline through the common inner cavity 55. The reflux hydrogen is pressurized by the air pump 68 and is sent to the hydrogen storage tank 1. During the reflux process of hydrogen, the pressure in the cooling pipe 42 drops, causing the free piston 43 to move downward immediately under the action of gravity and water pressure, and the water falls and fills the cooling pipe 42, and the heated cooling pipe 42 and the hydrogen delivery pipe 44 are cooled and cooled according to the heat conduction effect. The through hole 54 of the lining disc 53 is smaller than the aperture of the hydrogen transmission pipe 44. When the hydrogen transmission pipe 44 flows back to the common inner cavity 55 of the fixing seat 5, the through hole 54 prevents the hydrogen from quickly flowing into the common inner cavity 55, and the flow rate of the hydrogen is reduced, so that the high-pressure hydrogen inside the hydrogen transmission pipe 44 will not quickly enter the common inner cavity 55. The common inner cavity 55 will always be in a relatively low pressure state due to insufficient gas supply rate.

[0033] The docking groove 62 of the turntable 61 docks with the hydrogen delivery pipe 44. When the hydrogen generates heat to heat up the hydrogen delivery pipe 44 and the cooling pipe 42, the turntable 61 rotates to dock the docking groove 62 with the next hydrogen delivery pipe 44. At this time, the free piston 43 inside the heated cooling pipe 42 falls, so that the water body cools down 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, realizing the alternating cooling cycle effect, and the cooling pipes 42 are cooled in turn. The hydrogen delivery pipe 44 is cyclically cooled. For example, the first hydrogen delivery pipe 44 is heated up, the docking groove 62 of the turntable 61 rotates to the second hydrogen delivery pipe 44, and the through hole 63 docks with the first hydrogen delivery pipe 44. The free piston 43 in the cooling pipe 42 falls, and the water body 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, so that each heated hydrogen delivery pipe 44 is fully cooled.

[0034] The feature of the present application is that the free piston 43 can be raised and lowered. When the free piston 43 is raised, the heat generated by the hydrogen can be transferred to the side wall of the cooling tube 42. When the free piston 43 is lowered, the water body can quickly occupy the cooling tube 42 and cool down the side wall of the cooling tube 42 and the side wall of the hydrogen transmission tube 44 according to the heat conduction effect.

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

[0036] A heat dissipation rib 48 is fixedly mounted on the outer peripheral side of the cooling tube 42 . When the free piston 43 is pressed and moves upward, the heat dissipation rib 48 can assist in dissipating heat from the cooling tube 42 .

[0037] Example 2: A pressure-equalized hydrogen storage device for a hydrogen filling station in this embodiment is described with the differences from Example 1 as the center.

[0038] In this embodiment, an auxiliary pressing member is provided, which includes a rotating sleeve, which is mounted on the hollow shaft 64. The rotating sleeve is located between the gear of the hollow shaft 64 and the turntable 61, and auxiliary supports the turntable 61 to ensure the sealing relationship between the turntable 61 and the 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 principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A hydrogen storage device for a hydrogen filling station with equalized pressure, comprising a hydrogen storage tank, a constant pressure tank and a filling assembly, characterized in that: It also includes a cooling component, a fixed seat and a drive switching mechanism. The cooling component includes a water tank, a cooling pipe, a hydrogen delivery pipe and an annular main pipe. Several cooling pipes are connected to the bottom of the water tank. The cooling pipe is sleeved with a free piston. The bottom of the cooling pipe is connected to the hydrogen delivery pipe, and the hydrogen delivery pipe is communicated with the inside of the fixed seat. Branch pipes are radially connected to the side of the hydrogen delivery pipe. Each branch pipe is connected to the annular main pipe, and a one-way valve is arranged on the branch pipe to enable the hydrogen delivery pipe to transport gas to the annular main pipe in one direction; the constant pressure tank is connected to the filling component and the annular main pipe respectively through pipelines; the fixed seat is composed of a bottom plate and a sealing shell, and an inner lining disc is fixedly sleeved on the top of the fixed seat, and through holes corresponding to the hydrogen delivery pipe 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 an air pump. The hollow shaft is rotatably sleeved in the fixed seat, and the turntable is arranged below the inner lining disc and fixedly sleeved. On the hollow shaft, the turntable and the liner disc are sealed together, and a docking groove and a plurality of through holes are radially provided on the turntable. The docking groove is connected to the inside of the hollow shaft through a hydrogen inlet pipe, the motor is transmission-connected to 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 seat, and the air pump is connected to the common inner cavity through a pipeline; when the docking groove of the turntable is docked and connected to the hydrogen transmission pipe, the free piston in the cooling pipe will be pressed upward by the hydrogen to transfer the heat generated by the hydrogen to the cooling pipe; when the turntable rotates to dock the docking groove with the next hydrogen transmission pipe and dock the through hole with the previous hydrogen transmission pipe with hydrogen inside, the hydrogen in the hydrogen transmission pipe will be pumped back to the hydrogen storage tank by the air pump, and at the same time the free piston in the cooling pipe will fall, so that the water can fill the cooling pipe, and the cooling pipe and the hydrogen transmission pipe are cooled down.

2. A pressure-equalized hydrogen storage device for a hydrogen refueling station according to claim 1, characterized in that: An auxiliary sealing assembly is arranged on the top of the turntable, and the auxiliary sealing assembly comprises an outer annular embedding groove and an inner annular embedding groove which are opened on the top of the turntable, and the docking groove and the through hole are located between the outer annular embedding groove and the inner annular embedding groove, and the outer annular embedding groove and the inner annular embedding groove are both provided with an outer annular sealing layer and an inner annular sealing layer, and radial grooves are radially opened on both sides of the docking groove, and radial sealing layers are provided in the radial grooves.

3. The pressure-equalizing hydrogen storage device for a hydrogen refueling station according to claim 1, characterized in that: A heat dissipation rib is fixedly mounted on the outer peripheral side of the cooling pipe to assist in heat dissipation of the cooling pipe.

4. The pressure-equalizing hydrogen storage device for a hydrogen filling station according to claim 1, characterized in that: The filling assembly includes a main discharge pipe and a filling valve port. The constant pressure tank is connected to the annular main pipe and the main discharge pipe respectively through a tee pipe. The filling valve ports are evenly distributed on the main discharge pipe. The filling valve ports are connected to the hydrogenator of the hydrogen filling station through a pipeline.

5. The pressure-equalizing hydrogen storage device for a hydrogen filling station according to claim 1, characterized in that: A matching channel is provided inside the turntable, and the matching channel is located between the docking groove and the hollow shaft. The hydrogen inlet pipe is sleeved in the matching channel, and two ends of the hydrogen inlet pipe are respectively connected with the docking groove and the inside of the hollow shaft.

6. The pressure-equalizing hydrogen storage device for a hydrogen filling station according to claim 1, characterized in that: The through hole diameter of the lining disc is smaller than the hole diameters of the cooling pipe and the hydrogen transport pipe.

7. The pressure-equalized hydrogen storage device for a hydrogen refueling station according to claim 1, characterized in that: The motor is fixedly installed at the bottom of the fixing seat, and the hollow shaft is connected with the output shaft of the motor through gear transmission.

8. The pressure-equalized hydrogen storage device for a hydrogen refueling station according to claim 7, characterized in that: It also includes an auxiliary top pressure piece, which includes a rotating sleeve. The rotating sleeve is mounted on the hollow shaft, and the rotating sleeve is located between the gear on the hollow shaft and the turntable to assist in supporting the turntable and ensure the sealing relationship between the turntable and the liner disc.

Images