A gas filling device and method

Abstract

The application discloses a kind of gas filling device and method, belong to gas filling technical field.It includes liquid tank, gasifier, compressor and purifier connected in turn, the purifier output end is connected to aerator;It further includes first buffer tank, input stable gas valve group and output stable gas module, the first buffer tank is set between gasifier and compressor;First valve group is arranged between the first buffer tank and compressor;The input stable gas valve group includes pressure-equalizing valve and main one-way valve connected between compressor and purifier in turn;The output stable gas module is set between purifier and aerator;The output stable gas module includes second buffer tank and pressure accumulator;The gas filling device and method of the application can ensure the purification stability of purifier, maintain gas purity, when filling, vacuumize pipe section between aerator and aerator, ensure the gas purity of aerator filling, avoid filling gas to pollute surrounding environment and waste filling gas.

Description

Technical Field

[0001] This invention specifically relates to a gas filling device and method, belonging to the field of gas filling technology. Background Technology

[0002] Existing gas filling systems, especially those for liquid helium, mainly include a liquid tank, a vaporizer, a compressor, and a filling cylinder. However, before the gas enters the filling cylinder, leakage inevitably occurs during the gas compression process, causing a small amount of lubricating oil and outside air to mix into the gas to be filled, resulting in insufficient purity of the filled gas. To address this, Chinese Patent Publication No. CN212805232U discloses a high-purity gas filling system, including a liquid tank, a vaporizer, a compressor, a purifier, and a filling cylinder. The purifier contains an inlet... The gas inlet and outlet are provided with at least two purification sieves between them, which can purify the gas before filling it and improve the gas purity. When existing purifiers are working, the pressure (resistance) fluctuations on the gas input and output sides will affect the rate at which the gas passes through the purifier sieve holes and the contact time with the purifying agent, resulting in large fluctuations in gas purity. In addition, when the gas is filled into the filling tank, air is easily introduced into the filling tank, affecting the gas purity in the filling tank. Furthermore, when the filling tank is detached from the gas filling device after filling, it is easy to waste the filled gas. Summary of the Invention

[0003] To address the aforementioned problems, this invention proposes a gas filling device and method that can ensure the purification stability of the purifier, maintain gas purity, and during filling, evacuate the pipe section between the filling valve and the filling tank to ensure the purity of the gas filled in the filling tank, thereby avoiding pollution of the surrounding environment and waste of the filling gas.

[0004] The gas filling device of the present invention includes a filling main unit controlled by the entire device, and further includes a liquid tank, a vaporizer, a compressor and a purifier connected in sequence, wherein the output end of the purifier is connected to the filling tank; and further includes: A first buffer tank is disposed between the vaporizer and the compressor; a first valve group is disposed between the first buffer tank and the compressor; An input gas stabilizing valve assembly, comprising a pressure equalizing valve and a main check valve connected in sequence between the compressor and the purifier; An output gas stabilization module is disposed between the purifier and the gas filling tank; the output gas stabilization module includes a second buffer tank and a pressure accumulator; a second valve group is disposed between the second buffer tank and the pressure accumulator; the second buffer tank is connected to the output end of the purifier through a third valve group; the pressure accumulator is connected to the gas filling tank through an outlet valve group. Pressure transmitters are installed on the first buffer tank, the second buffer tank, and the accumulator tank.

[0005] During operation, the liquid tank vaporizes the liquefied filling gas through the vaporizer and continuously buffers and stores it in the first buffer tank. Then, the gas in the first buffer tank is pressure-stabilized by the pressure equalization valve through the compressor and sent to the purifier. The output side of the purifier is provided with output resistance by the basic gas stored in the second buffer tank, making the purification process of the purifier smoother. The purified filling gas output by the purifier is sent to the second buffer tank, and the second buffer tank intermittently sends the filling gas to the accumulator tank through the second valve group. The accumulator tank waits for the gas filling module to supply gas to the filling tank.

[0006] Furthermore, the volume of the second buffer tank is 5 to 15 times that of the accumulator tank.

[0007] Furthermore, an inflation module is provided between the accumulator tank and the inflation tank; the inflation module includes a gas filling pipe connected to the accumulator tank, an inflation valve and a four-way pipe connected in series at the output end of the gas filling pipe, and the remaining two ends of the four-way pipe are respectively connected to a first gas collecting valve group and a first one-way valve, the first one-way valve being connected to an extraction valve group; the extraction valve group is connected to a vacuum pump through a vacuum tank; the first gas collecting valve group is connected to a second one-way valve through a first air pump group, the second one-way valve being connected to the gas collecting tank; a pressure transmitter is provided on the gas collecting tank; The gas filling pipe can fill the gas tank with gas through the filling valve. The vacuum pump can evacuate the vacuum tank and can evacuate the space between the filling valve and the gas tank by intermittently opening the suction valve group. When the vacuum level drops after multiple opening and closing of the suction valve group, the vacuum pump can perform the evacuation operation again. The first gas pump group and the suction valve group work together to recover the filling gas between the filling valve and the gas tank.

[0008] Furthermore, the inflation module is externally equipped with a flanged tube compartment; sealing plates are fixed to the top and bottom of the flanged tube compartment, and a sealing gasket is provided between the sealing plates and the flanged tube compartment; the gas filling pipe passes through the flanged tube compartment via a sealing head, and multiple sealing rings are provided between the sealing head and the gas filling pipe; the sealing head is screwed and fixed to the sealing plate; a waterproof connector is fixed to the sealing plate; an inlet cable is provided on the waterproof connector; the inlet cable is connected to the filling controller; a pressure sensor is installed inside the flanged tube compartment, and a pressure sensor is connected in parallel to the vacuum tank. It has a vacuum valve; the other end of the vacuum valve is hollow, and the pressure sensor and the vacuum valve are connected through the filling controller; through the cooperation of the flange tube and the sealing plate, the filling module can be kept in a near-vacuum environment, so as to avoid the mixing of external air when the first air pump group recovers the filling gas, which would affect the purity of the recovered filling gas; when the pressure sensor detects that the vacuum degree in the flange tube is lost, the vacuum pump and the vacuum valve start to work, and the inside of the flange tube is evacuated a second time. When the vacuum degree in the flange tube continues to be lost, the filling controller will alarm.

[0009] Furthermore, a tee is installed between the first gas collecting valve group and the first air pump group, the third end of the tee is connected to a return valve group, and the other end of the return valve group is connected between the second check valve and the gas collecting tank.

[0010] Furthermore, the gas collecting tank is connected to the first buffer tank via a purification pipe; an external discharge valve group and a second air pump group are connected in series on the purification pipe; the recovered filling gas in the gas collecting tank is sent to the first buffer tank through the external discharge valve group and the second air pump group, waiting for the compressor to send it to the purifier for purification, thereby enabling the secondary use of the filling gas.

[0011] Furthermore, the vacuum pump is connected to an external gas tank via a second gas collecting valve assembly; the external gas tank is connected to a nitrogen purification device based on pressure swing adsorption (PSA) or membrane separation via a processing valve assembly; since the air extracted from the vacuum tank contains a certain amount of residual filling gas (nitrogen), by storing the mixture of air and residual nitrogen in the external gas tank, the residual nitrogen can be recovered and applied to the nitrogen purification device when the external gas tank reaches a set value; compared to directly producing nitrogen from the air, this mixture produces a larger amount of nitrogen; there are two mechanisms for separating air using pressure swing adsorption, one of which utilizes the selective adsorption characteristics of 5A zeolite molecular sieves. One method involves using pressure swing adsorption (PSA) to separate air. First, the equilibrium adsorption capacity of 5A zeolite molecular sieve for nitrogen is greater than its equilibrium adsorption capacity for oxygen. When air passes through the zeolite bed, nitrogen is adsorbed, and oxygen is released as the product. Once the zeolite is saturated with nitrogen, air flow is stopped, and the bed is evacuated to a vacuum. The extracted nitrogen is then used as the product. Another method utilizes the dynamic adsorption characteristics of carbon molecular sieves. Oxygen diffuses rapidly and is adsorbed in large quantities within the carbon molecular sieve, resulting in oxygen being adsorbed and nitrogen being released as the product. After a period of time, air flow is stopped, and the bed is evacuated to regenerate the carbon molecular sieve. PSA can separate oxygen-enriched air and 99.9% pure nitrogen.

[0012] Furthermore, the first air pump assembly includes a first suction pump and a second suction pump, which are connected by an intermediate air tank; a third one-way valve is provided between the first suction pump and the intermediate air tank; the output end of the second suction pump is connected to the gas collection tank; the horsepower of the second suction pump is 2 to 10 times greater than that of the first suction pump; the first and second suction pumps work together, with the first suction pump employing a low-power structure to support frequent start and stop. When the first suction pump continuously draws the filling gas from the pipe section between the filling valve and the filling tank and fills the intermediate air tank, when the gas pressure in the intermediate air tank reaches a set value, the second suction pump operates, sending the filling gas in the intermediate air tank into the gas collection tank.

[0013] A gas filling method, employing a gas filling device, is described in detail below: The first step involves vaporizing the gas to be filled. The gas is released from the liquid tank and continuously vaporized by the vaporizer. The vaporized gas is continuously stored in the first buffer tank. When the pressure in the first buffer tank reaches the release set value, the first valve group can be triggered by the filling host. When the pressure in the first buffer tank is lower than the lower limit value, the third valve group closes first, and then the first valve group closes. When the first buffer tank reaches the release set value again, the first and third valve groups can be triggered by the filling host. The second step is the purification of the gas to be charged. During gas purification, the third valve group is opened first, and the gas in the second buffer tank is backflowed to the output side of the purifier, so that the gas pressure at the output end of the purifier approaches the gas pressure in the second buffer tank. Then, the first valve group and the compressor are opened, and the gas in the first buffer tank is pressure-equalized through the pressure equalization valve, so that the input side of the purifier always maintains a stable gas pressure input; thus, both the input and output ends of the purifier always maintain a stable purified gas pressure; the purifier completes the purification of the gas to be charged, and when the pressure at the second buffer tank reaches the high pressure value, the purifier and the third valve group are closed. The third step is to stabilize the gas output. The second valve group opens and the second buffer tank fills the accumulator tank with gas until the accumulator tank reaches the set pressure value. Then the second valve group closes. When the gas pressure in the second buffer tank is lower than the basic gas storage pressure value, the second valve group locks itself until the gas pressure in the second buffer tank is greater than the sum of the basic gas storage pressure value and the gas filling amount of the accumulator tank. Then the second valve group can be triggered by the filling host. The fourth step is gas filling. The accumulator tank supplies gas to the gas filling pipe. When the accumulator tank pressure drops below the set value, the outlet valve group is closed and the second valve group is opened. The second buffer tank fills the accumulator tank with gas until the accumulator tank reaches the set pressure value. Then, the second valve group is closed. At this time, gas is supplied to the gas filling pipe through the outlet valve group. During gas supply, gas is filled into the filling tank through the gas filling pipe, as detailed below: First, connect the gas cylinder to the gas filling pipe. After connection, trigger the filling process through the filling host. Next, the vacuum pump is turned on to evacuate the vacuum tank. After evacuation, the suction valve assembly is intermittently opened to evacuate the pipe section between the filling valve and the filling tank, ensuring the purity of the gas filling later. When the suction valve assembly opens intermittently a set number of times or when the vacuum level of the filling tank is detected to be lower than the set value, the vacuum pump evacuates the vacuum tank again. Then, the suction valve assembly is closed, and the valves on the filling tank and the filling valve are opened sequentially to fill the filling tank with gas through the filling pipe until the filling tank reaches the set pressure value. Then, the valves on the filling tank and the filling valve are closed. Open the first gas collecting valve group and the first air pump group to recover the filling gas in the pipe section between the filling valve and the filling tank and store it in the gas collecting tank; after the filling gas recovery is completed, the filling tank is filled; separate the filled filling tank from the gas filling pipe and reconnect the new filling tank to the gas filling pipe; and continue the above operation; when the pressure value in the gas collecting tank reaches the set value, send it directly into the gas filling pipe through the return valve group, or send the gas in the gas collecting tank into the first buffer tank through the exhaust valve group and the second air pump group, wait for purification, and then send it back into the gas filling pipe for filling.

[0014] Compared with the prior art, the gas filling device and method of the present invention respectively sets a pressure equalization valve and a second buffer tank before and after the purifier. The pressure equalization valve ensures that the gas intake of the purifier is always in a stable state. The basic gas stored in the second buffer tank provides gas pressure to the output side of the purifier, ensuring that the resistance of the output side of the purifier fluctuates more smoothly. Thus, the purifier can purify the gas stably. During gas filling, the pipeline between the filling valve and the filling tank can be evacuated to ensure the purity of the gas filled in the filling tank. The filling gas in the pipeline between the filling valve and the filling tank can also be recovered to avoid gas overflow, pollution of the surrounding environment and waste of filling gas. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the overall structure of the gas filling device of the present invention.

[0016] Figure 2 This is a schematic diagram of one embodiment of the output gas stabilization module of the present invention.

[0017] Figure 3 This is a schematic diagram of another embodiment of the output gas stabilization module of the present invention.

[0018] Figure 4 This is a schematic diagram of the installation structure of the output gas stabilization module, external gas tank, and nitrogen purification equipment of the present invention.

[0019] Figure 5 This is a schematic diagram of the overall structure of the first air pump unit of the present invention.

[0020] Reference numerals: 1. Liquid tank; 2. Vaporizer; 3. Compressor; 4. Purifier; 5. Gas charging tank; 6. First buffer tank; 7. First valve assembly; 8. Pressure equalizing valve; 9. Main check valve; 10. Second buffer tank; 11. Accumulator; 12. Second valve assembly; 13. Gas outlet valve assembly; 14. Gas filling pipe; 15. Gas charging valve; 16. Four-way pipe; 17. First gas collecting valve assembly; 18. First check valve; 19. Vacuum valve assembly; 20. Vacuum tank; 21. Vacuum pump; 22. First gas pump assembly. 23. Second check valve; 24. Gas collection tank; 25. Flange pipe compartment; 26. Sealing plate; 27. End cap; 28. Waterproof joint; 29. ​​Vacuum valve; 30. Tee; 31. Reflux valve assembly; 32. Purification pipe; 33. External exhaust valve assembly; 34. Second gas pump assembly; 35. Second gas collection valve assembly; 36. External gas tank; 37. Processing valve assembly; 38. Nitrogen purification equipment; 39. First gas pump; 40. Second gas pump; 41. Intermediate gas tank; 42. Third check valve; 43. Third valve assembly. Detailed Implementation

[0021] Example 1: like Figures 1 to 5 The gas filling device shown includes a filling main unit controlled by the entire device, and also includes a liquid tank 1, a vaporizer 2, a compressor 3, and a purifier 4 connected in sequence, with the output end of the purifier 4 connected to the filling tank 5; it also includes: A first buffer tank 6 is disposed between the vaporizer 2 and the compressor 3; a first valve group 7 is disposed between the first buffer tank 6 and the compressor 3. An input gas stabilizing valve assembly, comprising a pressure equalizing valve 8 and a main check valve 9 connected in sequence between the compressor 3 and the purifier 4; An output gas stabilization module is disposed between the purifier 4 and the gas filling tank 5; the output gas stabilization module includes a second buffer tank 10 and a pressure accumulator 11; a second valve group 12 is disposed between the second buffer tank 10 and the pressure accumulator 11; the second buffer tank 10 is connected to the output end of the purifier 4 through a third valve group 43; the pressure accumulator 11 is connected to the gas filling tank 5 through an outlet valve group 13. Pressure transmitters are installed on the first buffer tank 6, the second buffer tank 10, and the accumulator tank 11.

[0022] During operation, the liquid tank 1 vaporizes the liquefied filling gas through the vaporizer 2 and continuously buffers and stores it in the first buffer tank 6. Then, the gas in the first buffer tank 6 is regulated by the compressor 3 through the pressure equalization valve 8 and sent to the purifier 4. The output side of the purifier 4 is provided with output resistance by the basic gas stored in the second buffer tank 10, making the purification process of the purifier 4 smoother. The purified filling gas output by the purifier 4 is sent to the second buffer tank 10. The second buffer tank 10 intermittently sends the filling gas to the accumulator tank 11 through the second valve group 12. The accumulator tank 11 waits for the gas filling module to supply gas to the gas filling tank 5.

[0023] The volume of the second buffer tank 10 is 5 to 15 times that of the pressure accumulator tank 11.

[0024] An inflation module is provided between the accumulator tank 11 and the inflation tank 5. The inflation module includes a gas filling pipe 14 connected to the accumulator tank 11. An inflation valve 15 and a four-way pipe 16 are connected in series at the output end of the gas filling pipe 14. The remaining two ends of the four-way pipe 16 are respectively connected to a first gas collecting valve group 17 and a first one-way valve 18. The first one-way valve 18 is connected to a vacuum valve group 19. The vacuum valve group 19 is connected to a vacuum pump 21 through a vacuum tank 20. The first gas collecting valve group 17 is connected to a second one-way valve 23 through a first air pump group 22. The second one-way valve 23 is connected to a gas collecting tank 24. A pressure transmitter is provided on the gas collecting tank 24. The gas filling pipe 14 can fill the gas tank 5 with gas through the filling valve 15. The vacuum pump 21 can evacuate the vacuum tank 20 and can evacuate the space between the filling valve 15 and the gas tank 5 by intermittently opening the suction valve group 19. When the vacuum level drops after the suction valve group 19 is opened and operated multiple times, the vacuum pump 21 can perform the vacuuming operation again. The first gas pump group 22 and the suction valve group 19 work together to recover the filling gas between the filling valve 15 and the gas tank 5.

[0025] The inflation module is externally equipped with a flanged tube compartment 25; sealing plates 26 are fixed to the top and bottom of the flanged tube compartment 25 respectively, and a sealing gasket is provided between the sealing plates 26 and the flanged tube compartment 25; the gas filling pipe 14 passes through the flanged tube compartment 25 through a head 27, and multiple sealing rings are provided between the head 27 and the gas filling pipe 14; the head 27 is screwed and fixed to the sealing plate 26; a waterproof connector 28 is fixed on the sealing plate 26; an inlet cable is provided on the waterproof connector 28; the inlet cable is connected to the filling controller; a pressure sensor is installed inside the flanged tube compartment 25, and the vacuum tank 20... A vacuum valve 29 is connected to the top; the other end of the vacuum valve 29 is hollow, and the pressure sensor and the vacuum valve 29 are connected through the filling controller; through the cooperation of the flange chamber 25 and the sealing plate 26, the filling module can be kept in a near-vacuum environment, so as to avoid the first air pump group 22 from mixing in external air when recovering the filling gas, thus affecting the purity of the recovered filling gas; when the pressure sensor detects that the vacuum degree in the flange chamber 25 is lost, the vacuum pump 21 and the vacuum valve 29 start working to perform a secondary vacuuming inside the flange chamber 25; when the vacuum degree in the flange chamber 25 continues to be lost, the filling controller alarms.

[0026] A tee 30 is installed between the first gas collecting valve group 17 and the first air pump group 22. The third end of the tee 30 is connected to a return valve group 31, and the other end of the return valve group 31 is connected between the second check valve 23 and the gas collecting tank 24.

[0027] The gas collecting tank 24 is connected to the first buffer tank 6 through the purification pipe 32; the purification pipe 32 is connected in series with the external discharge valve group 33 and the second air pump group 34; the recovered filling gas in the gas collecting tank 24 is sent to the first buffer tank 6 through the external discharge valve group 33 and the second air pump group 34, and waits for the compressor 3 to send it to the purifier 4 for purification, so that the filling gas can be reused.

[0028] The vacuum pump 21 is connected to the external gas tank 36 via the second gas collecting valve group 35; the external gas tank 36 is connected to the nitrogen purification equipment 38 based on pressure swing adsorption or membrane separation via the processing valve group 37; since the air extracted from the vacuum tank 20 contains a certain amount of residual filling gas (nitrogen), by storing the mixed gas composed of air and residual nitrogen in the external gas tank 36, when the external gas tank 36 reaches a set value, the residual nitrogen can be recovered and applied to the nitrogen purification equipment 38; compared with directly producing nitrogen from the air, the amount of nitrogen produced by this mixed gas is greater; there are two mechanisms for separating air by pressure swing adsorption, one of which is using 5A zeolite molecular sieves. One method utilizes the selective adsorption characteristics of 5A zeolite molecular sieves. Specifically, the equilibrium adsorption capacity of 5A zeolite molecular sieve for nitrogen is greater than its equilibrium adsorption capacity for oxygen. Thus, when air passes through the zeolite bed, nitrogen is adsorbed, and oxygen flows out as the product. Once the zeolite is saturated with nitrogen, air flow is stopped, and the bed is evacuated; the extracted nitrogen is then used as the product. Another method utilizes the dynamic adsorption characteristics of carbon molecular sieves. Oxygen diffuses rapidly and is adsorbed in carbon molecular sieves, resulting in oxygen adsorption and nitrogen flowing out as the product. After a period of time, air flow is stopped, and the bed is evacuated to regenerate the carbon molecular sieve. Pressure swing adsorption (PSA) can separate air to obtain oxygen-enriched air and 99.9% pure nitrogen.

[0029] The first air pump assembly 22 includes a first air pump 39 and a second air pump 40, which are connected by an intermediate air tank 41. A third one-way valve 42 is provided between the first air pump 39 and the intermediate air tank 41. The output end of the second air pump 40 is connected to the gas collection tank 24. The horsepower of the second air pump 40 is 2 to 10 times greater than that of the first air pump 39. The first air pump 39 and the second air pump 40 work together. The first air pump 39 adopts a low-power structure and can support frequent start and stop. When the first air pump 39 continuously draws the filling gas in the pipe section between the filling valve 15 and the filling tank 5 and fills the intermediate air tank 41, when the gas pressure in the intermediate air tank 41 reaches the set value, the second air pump 40 works and sends the filling gas in the intermediate air tank 41 into the gas collection tank 24.

[0030] A gas filling method, employing a gas filling device, is described in detail below: The first step involves vaporizing the gas to be filled. The gas is released from the liquid tank 1 and continuously vaporized via the vaporizer 2. The vaporized gas is continuously stored in the first buffer tank 6. When the pressure in the first buffer tank 6 reaches the release set value, the first valve group 7 can be triggered by the filling host. When the pressure in the first buffer tank 6 is lower than the lower limit value, the third valve group 43 closes first, and then the first valve group 7 closes. When the first buffer tank 6 reaches the release set value again, the first valve group 7 and the third valve group 43 can be triggered by the filling host. The second step is to purify the gas to be charged. During gas purification, the third valve group 43 is opened first, and the gas in the second buffer tank 10 is backflowed to the output side of the purifier 4, so that the gas pressure at the output end of the purifier 4 approaches the gas pressure in the second buffer tank 10. Then, the first valve group 7 and the compressor 3 are opened, and the gas in the first buffer tank 6 is pressure-equalized through the pressure equalization valve 8, so that the input side of the purifier 4 always maintains a stable gas pressure input; thus, both the input and output ends of the purifier 4 always maintain a stable purified gas pressure; the purifier 4 completes the purification of the gas to be charged, and when the pressure at the second buffer tank 10 reaches the high pressure value, the purifier 4 and the third valve group 43 are closed. The third step is to stabilize the gas output. The second valve group 12 opens, and the second buffer tank 10 charges the accumulator tank 11 with gas until the accumulator tank 11 reaches the set pressure value. Then, the second valve group 12 closes. When the gas pressure in the second buffer tank 10 is lower than the basic gas storage pressure value, the second valve group 12 self-locks until the gas pressure in the second buffer tank 10 is greater than the sum of the basic gas storage pressure value and the gas charge of the accumulator tank 11. Then, the second valve group 12 can be triggered by the filling host. The fourth step is gas filling. The accumulator 11 supplies gas to the gas filling pipe 14. When the accumulator 11 is below the set pressure value, the outlet valve group 13 is closed, and the second valve group 12 is opened. The second buffer tank 10 fills the accumulator 11 with gas until the accumulator 11 reaches the set pressure value. Then, the second valve group 12 is closed. At this time, gas is supplied to the gas filling pipe 14 through the outlet valve group 13. During gas supply, gas is filled into the filling tank 5 through the gas filling pipe 14, as detailed below: First, connect the gas tank 5 to the gas filling pipe 14. After the connection is completed, the filling process is triggered by the filling host. Next, vacuum pump 21 is turned on to evacuate vacuum tank 20. After evacuation, vacuum valve assembly 19 is intermittently opened to evacuate the pipe section between inflation valve 15 and inflation tank 5, ensuring the purity of the gas filling tank 5 in the later stages. When vacuum valve assembly 19 is intermittently opened a set number of times or when the vacuum level of inflation tank 5 is detected to be lower than the set value, vacuum pump 21 evacuates vacuum tank 20 again. Then, vacuum valve assembly 19 is closed, and the valves and inflation valve 15 of inflation tank 5 are opened in sequence to fill inflation tank 5 through gas filling pipe 14 until inflation tank 5 reaches the set pressure value. Then, the valves and inflation valve 15 of inflation tank 5 are closed. Open the first gas collecting valve group 17 and the first air pump group 22 to recover the filling gas in the pipe section between the filling valve 15 and the filling tank 5 and store it in the gas collecting tank 24; after the filling gas recovery is completed, the filling tank 5 is filled; separate the filled filling tank 5 from the gas filling pipe 14 and reconnect the new filling tank 5 to the gas filling pipe 14; and continue the above operation; when the pressure value in the gas collecting tank 24 reaches the set value, it is directly sent to the gas filling pipe 14 through the return valve group 31, or the gas in the gas collecting tank 24 is sent to the first buffer tank 6 through the exhaust valve group 33 and the second air pump group 34, and after purification, it is sent to the gas filling pipe 14 again for filling.

[0031] The above embodiments are merely preferred embodiments of the present invention. Therefore, all equivalent changes or modifications made to the structure, features and principles described in the claims of the present invention are included within the scope of the present invention.

Claims

1. A gas filling device, comprising a filling main unit controlled by the entire device, and further comprising a liquid tank, a vaporizer, a compressor, and a purifier connected in sequence, wherein the output end of the purifier is connected to the filling tank; characterized in that: Also includes: A first buffer tank is disposed between the vaporizer and the compressor; a first valve group is disposed between the first buffer tank and the compressor; An input gas stabilizing valve assembly, comprising a pressure equalizing valve and a main check valve connected in sequence between the compressor and the purifier; An output gas stabilization module is disposed between the purifier and the gas filling tank; the output gas stabilization module includes a second buffer tank and a pressure accumulator; a second valve group is disposed between the second buffer tank and the pressure accumulator; the second buffer tank is connected to the output end of the purifier through a third valve group; the pressure accumulator is connected to the gas filling tank through an outlet valve group. Pressure transmitters are installed on the first buffer tank, the second buffer tank, and the accumulator tank. An inflation module is provided between the accumulator tank and the inflation tank; the inflation module includes a gas filling pipe connected to the accumulator tank, an inflation valve and a four-way pipe connected in series at the output end of the gas filling pipe, and the remaining two ends of the four-way pipe are respectively connected to a first gas collecting valve group and a first one-way valve, the first one-way valve being connected to a vacuum valve group; the vacuum valve group is connected to a vacuum pump through a vacuum tank; the first gas collecting valve group is connected to a second one-way valve through a first air pump group, the second one-way valve being connected to the gas collecting tank; a pressure transmitter is provided on the gas collecting tank. The inflation module is externally equipped with a flanged tube compartment; sealing plates are fixed to the top and bottom of the flanged tube compartment, and a sealing gasket is provided between the sealing plates and the flanged tube compartment; the gas filling pipe passes through the flanged tube compartment through the end cap, and multiple sealing rings are provided between the end cap and the gas filling pipe; the end cap is screwed and fixed to the sealing plate; a waterproof connector is fixed to the sealing plate; an inlet cable is provided on the waterproof connector; the inlet cable is connected to the filling controller; a pressure sensor is installed inside the flanged tube compartment, and a vacuum valve is connected in parallel to the vacuum tank; the other end of the vacuum valve is hollow, and the pressure sensor and the vacuum valve are connected through the filling controller.

2. The gas filling device according to claim 1, characterized in that: The volume of the second buffer tank is 5 to 15 times that of the accumulator tank.

3. The gas filling device according to claim 1, characterized in that: A tee is installed between the first gas collecting valve group and the first air pump group. The third end of the tee is connected to a return valve group, and the other end of the return valve group is connected between the second check valve and the gas collecting tank.

4. The gas filling device according to claim 1, characterized in that: The gas collecting tank is connected to the first buffer tank via a purification pipe; an external discharge valve group and a second air pump group are connected in series on the purification pipe.

5. The gas filling device according to claim 1, characterized in that: The vacuum pump is connected to an external gas tank via a second gas collection valve assembly; the external gas tank is connected to a nitrogen purification device based on pressure swing adsorption or membrane separation via a processing valve assembly.

6. The gas filling device according to claim 1, characterized in that: The first air pump assembly includes a first air pump and a second air pump, which are connected by an intermediate air tank; a third one-way valve is provided between the first air pump and the intermediate air tank; the output end of the second air pump is connected to an air collection tank; the horsepower of the second air pump is 2 to 10 times greater than that of the first air pump.

7. A gas filling method, employing the gas filling device according to any one of claims 1 to 6, characterized in that: The method is as follows: The first step involves vaporizing the gas to be filled. The gas is released from the liquid tank and continuously vaporized by the vaporizer. The vaporized gas is continuously stored in the first buffer tank. When the pressure in the first buffer tank reaches the release set value, the first valve group can be triggered by the filling host. When the pressure in the first buffer tank is lower than the lower limit value, the third valve group closes first, and then the first valve group closes. When the first buffer tank reaches the release set value again, the first and third valve groups can be triggered by the filling host. The second step is to purify the gas to be charged. During gas purification, the third valve group is opened first, and the gas in the second buffer tank is backflowed to the output side of the purifier, so that the gas pressure at the output end of the purifier approaches the gas pressure in the second buffer tank. Then, the first valve group and the compressor are opened, and the gas in the first buffer tank is pressure-equalized through the pressure equalization valve, so that the input side of the purifier always maintains a stable gas pressure input; thus, both the input and output ends of the purifier always maintain a stable purified gas pressure. The purifier purifies the gas to be charged. When the pressure at the second buffer tank reaches the high pressure value, the purifier and the third valve group are closed. The third step is to stabilize the gas output. The second valve group opens and the second buffer tank fills the accumulator tank with gas until the accumulator tank reaches the set pressure value. Then the second valve group closes. When the gas pressure in the second buffer tank is lower than the basic gas storage pressure value, the second valve group locks itself until the gas pressure in the second buffer tank is greater than the sum of the basic gas storage pressure value and the gas filling amount of the accumulator tank. Then the second valve group can be triggered by the filling host. The fourth step is gas filling. The accumulator tank supplies gas to the gas filling pipe. When the accumulator tank pressure drops below the set value, the outlet valve group is closed and the second valve group is opened. The second buffer tank fills the accumulator tank with gas until the accumulator tank reaches the set pressure value. Then, the second valve group is closed. At this time, gas is supplied to the gas filling pipe through the outlet valve group. During gas supply, gas is filled into the filling tank through the gas filling pipe, as detailed below: First, connect the gas cylinder to the gas filling pipe. After connection, trigger the filling process through the filling host. Next, the vacuum pump is turned on to evacuate the vacuum tank. After evacuation, the suction valve assembly is intermittently opened to evacuate the pipe section between the inflation valve and the inflation tank, ensuring the purity of the gas filling later. When the suction valve assembly is intermittently opened a set number of times or when the vacuum level of the inflation tank is detected to be lower than the set value, the vacuum pump evacuates the vacuum tank again. Then, the suction valve assembly is closed, and the valves and inflation valves on the inflation tank are opened sequentially to inflate the tank through the gas filling pipe until the tank reaches the set pressure value. Then, the valves and inflation valves on the inflation tank are closed. Next, the... The first gas collecting valve group and the first air pump group are activated to recover the filling gas in the pipe section between the filling valve and the filling tank and store it in the gas collecting tank. After the filling gas recovery is completed, the filling tank is filled. The filled filling tank is separated from the gas filling pipe, and a new filling tank is reconnected to the gas filling pipe. The above operations are continued. When the pressure value in the gas collecting tank reaches the set value, it is directly sent to the gas filling pipe through the return valve group, or the gas in the gas collecting tank is sent to the first buffer tank through the exhaust valve group and the second air pump group. After purification, it is sent to the gas filling pipe again for filling.

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