Inflation device for small gas cylinder

Abstract

The invention relates to the technical field of gas cylinder filling equipment, and discloses a gas filling device for a small gas cylinder, the gas filling device comprises a filling table, an upper fixing table is connected above the filling table through a guide rod, and a filling pipeline is fixed above the upper fixing table; a jacking fixing device slides on the guide rod in a lifting mode, a main body part of the jacking fixing device is located in the filling table, an external air cylinder is fixed in the filling table, the end of a telescopic push rod of the external air cylinder is fixed to the bottom of the jacking fixing device, and a plurality of through holes are formed in the positions, corresponding to the lower portions of the connectors, of the top of the jacking fixing device. An elastic supporting plate is arranged in each through hole, and the bottom of each elastic supporting plate is supported on the bottom column; the outer side of each bottom column is sleeved with an outer sleeve, and each outer sleeve slides on the corresponding bottom column in a lifting mode. The problems that in the prior art, leakage occurs when small and medium-sized gas cylinders are inflated, the protection effect is poor, the gas cylinders bounce, and a structure for closing a valve in time is lacked during leakage are solved.

Description

Technical Field

[0001] The invention relates to the technical field of gas cylinder filling equipment, in particular to a filling device for a small gas cylinder. Background Art

[0002] In many fields such as industrial production, medical emergency, scientific research experiments, etc., small gas cylinders are widely used in gas storage and transportation because of their characteristics of being easy to carry, store and use. As a key equipment, the performance of the small gas cylinder inflation device directly affects the safety and reliability of the gas cylinder use. Existing small gas cylinder inflation devices usually adopt a simple valve control and pressure monitoring structure to realize the inflation operation of the gas cylinder by manual or mechanical means. This type of inflation device can meet basic inflation needs to a certain extent, but with the increasing complexity of usage scenarios and the continuous improvement of safety performance requirements, its limitations are gradually emerging.

[0003] First, in terms of leakage prevention, the sealing structure design of existing inflation devices is relatively simple. When used for a long time or subjected to external force impact, the sealing components are prone to wear and aging, resulting in gas leakage, which not only causes a waste of resources, but also may cause safety hazards. Secondly, the protective performance is insufficient. When the pressure rises abnormally during the inflation process, it is easy to cause the gas cylinder to eject and bounce, which seriously threatens the safety of personnel and equipment, and also threatens other gas cylinders. Furthermore, in terms of stability, when facing complex use environments or frequent operations, existing inflation devices are prone to loosening and displacement of components, resulting in an unstable inflation process, affecting inflation efficiency and quality. Finally, when a leak occurs, most existing inflation devices rely on manual discovery and manual closure of the valve. Since the leak is not easy to detect in the early stage, the best closing time is often missed, and the leak cannot be blocked in time, resulting in an expansion of the leak range and more serious consequences. Summary of the invention

[0004] 1. Technical issues to be resolved In view of the shortcomings of the prior art, the present invention provides an inflation device for small gas cylinders, which has the advantages of anti-leakage, strong protection effect, strong stability, and automatic valve closing when leaking. It solves the problems in the prior art that small and medium-sized gas cylinders leak when inflated, have poor protection effect, bounce of gas cylinders, and lack of a structure to close the valve in time when leaking.

[0005] (II) Technical solution To achieve the above object, the present invention provides the following technical solutions: An inflation device for a small gas cylinder, comprising a filling platform. Above the filling platform, an upper fixing platform is connected through a guide rod. Above the upper fixing platform, a filling pipeline is fixed. The filling pipeline includes a main pipe and a plurality of branch pipes. Each branch pipe passes through the upper fixing platform and a connector is arranged at the bottom of the upper fixing platform. Each connector is used to connect a gas cylinder respectively. The filling gas is filled into each gas cylinder in turn through the main pipe, the branch pipes and the connectors. A jacking and fixing device slides up and down on the guide rod. The main part of the jacking and fixing device is located inside the filling platform. An external cylinder is fixed inside the filling platform. The end of the telescopic push rod of the external cylinder is fixed at the bottom of the jacking and fixing device. At the top of the jacking and fixing device, a plurality of through holes are arranged at positions corresponding to the lower sides of the respective connectors. Elastic support plates are arranged in each through hole. The bottom of each elastic support plate supports on a bottom column, and each bottom column is fixed inside the jacking and fixing device. By controlling the external cylinder to push the jacking and fixing device to lift, the elastic support plates are abutted against the bottom of the gas cylinder to provide elastic support. An outer sleeve is sleeved on the outside of each bottom column respectively. Each outer sleeve slides up and down on the corresponding bottom column. The outer sides of the bottoms of all the outer sleeves are fixed on the same movable bottom plate. An internal cylinder is also arranged inside the jacking and fixing device. The end of the telescopic push rod of the internal cylinder is fixed on the movable bottom plate. By controlling the internal cylinder to push the movable bottom plate to lift, each outer sleeve rises to a position where it wraps around each gas cylinder.

[0006] Preferably, spiral air channels are respectively arranged inside each outer sleeve. An air pump and an air cavity are also fixed on the movable bottom plate. Each spiral air channel is communicated to the air outlet of the air pump through a cavity inside the movable bottom plate, or each spiral air channel is directly communicated to the air outlet of the air pump through an air channel. The air inlet of the air pump is communicated with the air cavity. An air inlet with a one-way valve is arranged on the shell of the air cavity. A refrigeration component is arranged inside the air cavity. The gas inhaled into the cavity of the air cavity is cooled and then discharged into each spiral air channel through the air pump. The air outlet of each spiral air channel is arranged at the outer wall position of the outer sleeve near the top.

[0007] Preferably, adjusting air ports are respectively arranged at the air outlet positions of each spiral air channel. Each adjusting air port includes an adjusting air channel penetrating through the inside and outside of the outer sleeve. The adjusting air channel is communicated with the spiral air channel. An adjusting air core is slidably connected inside the adjusting air channel. A spring is connected to the position of the adjusting air core close to the outside of the outer sleeve. When there is no leakage in the gas cylinder inside the outer sleeve, the regulating air core is pushed by the spring to the inner side position of the regulating air passage. At this time, the spiral air passage is connected to the outside through the regulating air passage, so that the cold air in the air chamber is discharged into the spiral air passage by the air pump and discharged through the outer side of the regulating air passage; when there is a leakage in the gas cylinder inside the outer sleeve, the regulating air core is pushed outwards by the air pressure inside the outer sleeve. At this time, the spiral air passage is connected to the inner cavity of the outer sleeve through the regulating air passage, so that the leaked chemical gas inside the outer sleeve is inhaled into the air chamber by the air pump through the regulating air passage, and when the temperature in the air chamber rises due to the filling of gas, it can be cooled by the refrigeration component.

[0008] Preferably, socket seats are arranged at the positions outside each connector below the upper fixing table. The inner walls of the socket seats are attached to the outer walls of the corresponding tops of the outer sleeves. A deflation shut-off valve mechanism is arranged at the position of the upper fixing table inside the socket seats for closing the corresponding branch pipes during deflation. A deflation locking mechanism is arranged at the position of the jacking fixing device inside the outer sleeve for locking the jacking fixing device during deflation to prevent the outer sleeve from being manually opened during deflation.

[0009] Preferably, the deflation shut-off valve mechanism includes a gas pressure sensor arranged inside the socket seat and an automatic stop valve arranged on the branch pipe. When the pressure sensor detects an increase in pressure, the branch pipe is closed by controlling the automatic stop valve; Or, the deflation shut-off valve mechanism includes a stop valve arranged on the branch pipe. The inside of the socket seat is connected to the stop valve through a ventilation passage, and the pressure generated by the leakage pushes the valve core to move to the position of closing the stop valve.

[0010] Preferably, the deflation locking mechanism includes a pressure sensor arranged inside the outer sleeve and an electromagnetic locking device arranged on the side of the jacking fixing device. A side baffle is arranged at the position on the side of the jacking fixing device inside the filling table. Positioning holes are arranged in an array on the side baffle. When the pressure sensor inside the outer sleeve detects an increase in pressure, the locking tongue of the locking device is ejected and stuck in the positioning holes by controlling, so as to lock the jacking fixing device in a fixed position; Or, the deflation locking mechanism includes a mechanical pressure type locking device arranged on the side of the jacking fixing device. A through hole is arranged on the elastic support plate to connect the inner cavity of the outer sleeve with the bottom column. A ventilation passage is arranged inside the bottom column. One end of the ventilation passage is connected to the inner cavity of the outer sleeve and the other end is connected to the locking device. The pressure generated by the leakage pushes the locking tongue of the locking device to move to the position of inserting into the positioning hole.

[0011] Preferably, the filling table includes a frame. The guide rod is arranged at the top of the frame. A lower support plate is arranged at a position close to the bottom inside the frame. The external cylinder is fixed on the lower support plate. Through holes are arranged on the lower support plate at the positions corresponding to the internal cylinders. The side baffle is fixed above the lower support plate.

[0012] Preferably, an external thread section is provided at the lower end of the connector head, and an internal thread interface adapted to the external thread section is provided at the mouth of the gas cylinder; an axially penetrating inflation channel is formed inside the connector head, and the inflation channel is communicated with the channel inside the branch pipe. An annular gasket is embedded at the lower opening of the inflation channel. When the connector head is screwed into the internal thread interface of the gas cylinder by thread, the annular gasket forms a sealing fit with the end face of the mouth of the gas cylinder; A push rod that can move axially is arranged inside the inflation channel. The upper end of the push rod is elastically connected to the top of the inflation channel through a spring, and the lower end extends below the annular gasket; When the connector head is completely connected to the gas cylinder, the lower end of the push rod abuts against and pushes open the valve core of the bottle valve inside the gas cylinder, so that the inflation channel is communicated with the inside of the gas cylinder; when the connector head is unscrewed, the push rod resets under the action of the spring, and the valve core of the bottle valve inside the gas cylinder closes under the action of its own spring force.

[0013] Preferably, the electromagnetic locking device includes a locking tongue, a return spring and an electromagnetic coil. A wedge-shaped guiding surface is provided at the end of the locking tongue, the positioning hole is a conical hole adapted to the wedge-shaped guiding surface, and the locking tongue extends when the electromagnetic coil is energized and retracts when the power is off under the push of the return spring.

[0014] Preferably, a control panel is provided on the side of the filling platform. The control panel includes a PLC controller, a display screen and control buttons. The PLC controller is electrically connected to the external cylinder, the internal cylinder, the air pump, the refrigeration component and the automatic cut-off valve respectively. The display screen is used to display the filling pressure of each gas cylinder, the temperature inside the air chamber and the working state of the system.

[0015] (III) Beneficial effects Compared with the prior art, the present invention provides an inflation device for small gas cylinders, having the following beneficial effects: 1. For the inflation device for small gas cylinders, a liftable jacking and fixing device is arranged inside the filling platform, and a liftable outer sleeve is arranged inside the jacking and fixing device. During filling, the outer sleeve is used to wrap the gas cylinder, playing multiple roles of preventing leaked gas from escaping into the air and preventing the bouncing of the gas cylinder with loose connection. At the same time, a deflation shut-off mechanism and a deflation locking mechanism are respectively arranged above and below the cavity inside the outer sleeve. When deflation occurs, by using the sealing property of the outer sleeve, through a pressure sensor or a pneumatic pushing structure, the branch pipe is automatically closed immediately at the moment of deflation, and the jacking and fixing device is automatically locked and stationary on the side baffle to slide, avoiding the leakage caused by opening the outer sleeve during deflation.

[0016] 2. The inflation device for the small gas cylinder has a spiral air passage arranged in the outer sleeve, and utilizes an air pump arranged on the movable bottom plate to pass the cooling gas in the air cavity into the spiral air passage for cooling and heat dissipation through the air pump, thereby preventing the gas cylinder from heating up due to increased pressure during the filling process. At the same time, the outer sleeve as a protective cover is utilized as a radiator, thereby increasing the heat dissipation efficiency while ensuring the sealing performance.

[0017] 3. The inflation device for the small gas cylinder is provided with a regulating gas port at the air outlet of the spiral air duct, and a regulating gas core and a spring are provided in the regulating gas port. When there is no leakage in the gas cylinder in the outer sleeve, the regulating gas core is pushed by the spring to the inner side of the regulating air duct, and the cold air in the air cavity is discharged into the spiral air duct through the air pump and discharged through the outer side of the regulating air duct. When the gas cylinder in the outer sleeve leaks, the regulating gas core is pushed outward by the air pressure in the outer sleeve, and the chemical gas leaked in the outer sleeve is sucked into the air cavity through the regulating air duct through the air pump. When the temperature in the air cavity rises due to the filling of gas, it can be cooled by the refrigeration component. When leakage occurs and the temperature suddenly increases, it can also be discharged into the air cavity through the spiral air duct to avoid explosion caused by a sudden pressure increase. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 This is a schematic diagram of the overall front structure of the present invention. At this time, the gas cylinder has been fixed on the connecting head of the filling pipeline, and the jacking and fixing device has not been raised.

[0019] Figure 2 It is a schematic diagram of the overall back structure of the present invention, and the state is Figure 1 same.

[0020] Figure 3 This is a cross-sectional view of the present invention, the viewing angle is front view, the section line is located between the two exhaust cylinders, the state is the same as Figure 1 same.

[0021] Figure 4 This is a cross-sectional view of the present invention, the viewing angle is front view, the section line passes through the center of the gas cylinder, and the state is the same as Figure 1 same.

[0022] Figure 5 This is a schematic diagram of the overall front structure of the present invention. At this time, the lifting and fixing device is raised, and the outer sleeve wraps the gas cylinder.

[0023] Figure 6 It is a schematic diagram of the overall back structure of the present invention, and the state is Figure 5 same.

[0024] Figure 7 This is a cross-sectional view of the present invention, the viewing angle is front view, the section line is located between the two exhaust cylinders, the state is the same as Figure 5 same.

[0025] Figure 8This is a sectional view of the present invention, with a front view perspective. The section line passes through the center of the gas cylinder, and the state is the same as that of Figure 5 the same.

[0026] Figure 9 This is an exploded view of the present invention.

[0027] Figure 10 This is a schematic structural view of the back of the filling platform of the present invention.

[0028] Figure 11 This is a schematic structural view of the back of the lifting and fixing device of the present invention.

[0029] Figure 12 This is a schematic assembly structural view of the upper fixing platform and the filling pipeline of the present invention.

[0030] Figure 13 This is a schematic structural view of the gas cylinder of the present invention.

[0031] Figure 14 This is a schematic assembly structural view of the outer lifting frame, elastic support plate, built-in cylinder and bottom column of the present invention.

[0032] Figure 15 This is a sectional view of the assembly of the outer lifting frame, elastic support plate, built-in cylinder and bottom column of the present invention.

[0033] Figure 16 This is a schematic assembly structural view of the outer sleeve, movable bottom plate, air chamber and air pump of the present invention.

[0034] Figure 17 This is a sectional view of the assembly of the outer sleeve, movable bottom plate, air chamber and air pump of the present invention. The section line is located in the middle of two rows of outer sleeves.

[0035] Figure 18 This is a sectional view of the assembly of the outer sleeve, movable bottom plate, air chamber and air pump of the present invention. The section line passes through the center of the outer sleeve.

[0036] Figure 19 This is a sectional view of the adjustment air port of the present invention.

[0037] In the figure: 1. Filling platform; 11. Frame; 12. Lower support plate; 13. Side baffle; 14. External cylinder; 15. Guide rod; 131. Positioning hole; 2. Lifting and fixing device; 21. Outer lifting frame; 22. Elastic support plate; 23. Built-in cylinder; 24. Bottom column; 25. Outer sleeve; 26. Movable bottom plate; 27. Air chamber; 28. Air pump; 29. Locking device; 251. Spiral air passage; 252. Adjustment air port; 2521. Adjustment air passage; 2522. Adjustment air core; 3. Gas cylinder; 31. Manual valve; 4. Upper fixing platform; 41. Socket; 5. Filling pipeline; 51. Main pipe; 52. Branch pipe; 53. Automatic stop valve; 54. Connector. Detailed implementation mode

[0038] The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0039] In the description of the present invention, it should be understood that the orientation or positional relationship indicated by the terms "length", "width", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as a limitation to the present invention.

[0040] In addition, a fixed connection means that after the parts or components are fixed, there is no relative movement; a transmission connection means a connection method that transmits mechanical motion or torque to other working parts through transmission parts; a sliding connection means a connection method in which two objects are in contact but not fixed and can slide relative to each other; a rotational connection means a connection method in which two objects are in contact but not fixed and can rotate relative to each other.

[0041] In addition, the terms "first" and "second" are only used for descriptive purposes and cannot be construed as indicating or implying relative importance or implicitly indicating the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include one or more of such features. In the description of the present invention, "a plurality" means two or more, unless otherwise specifically defined.

[0042] Embodiment 1: This embodiment provides an inflation device for a small gas cylinder, having the following technical features.

[0043] Please refer to Figure 1-19, An inflation device for a small gas cylinder, including a filling platform 1. Above the filling platform 1, an upper fixing platform 4 is connected through a guide rod 15. Above the upper fixing platform 4, a filling pipeline 5 is fixed. The filling pipeline 5 includes a main pipe 51 and multiple branch pipes 52. Each branch pipe 52 passes through the upper fixing platform 4 and a connector 54 is provided at the bottom of the upper fixing platform 4. Each connector 54 is used to connect the gas cylinders 3 respectively. The filling gas sequentially passes through the main pipe 51, the branch pipes 52 and the connectors 54 and then is filled into each gas cylinder 3; A lifting and fixing device 2 slides up and down on the guide rod 15. The main part of the lifting and fixing device 2 is located inside the filling platform 1. An external cylinder 14 is fixed inside the filling platform 1. The end of the telescopic push rod of the external cylinder 14 is fixed at the bottom of the lifting and fixing device 2. At the top of the lifting and fixing device 2, multiple through holes are provided at positions corresponding to the lower sides of the respective connectors 54. Elastic support plates 22 are arranged in each through hole. The bottom of each elastic support plate 22 supports on a bottom column 24. Each bottom column 24 is fixed inside the lifting and fixing device 2. By controlling the external cylinder 14 to push the lifting and fixing device 2 to lift, the elastic support plates 22 are abutted against the bottom of the gas cylinder 3 to provide elastic support; An outer sleeve 25 is sleeved outside each bottom column 24 respectively. Each outer sleeve 25 slides up and down on the corresponding bottom column 24. The outer sides of the bottoms of all the outer sleeves 25 are fixed on the same movable bottom plate 26. An internal cylinder 23 is also arranged inside the lifting and fixing device 2. The end of the telescopic push rod of the internal cylinder 23 is fixed on the movable bottom plate 26. By controlling the internal cylinder 23 to push the movable bottom plate 26 to lift, each outer sleeve 25 rises to a position where it wraps around each gas cylinder 3.

[0044] It should be noted that the outer wall of the outer sleeve 25 fits against the inner wall of the through hole at the top of the lifting and fixing device 2, the outer wall of the bottom column 24 fits against the inner wall of the outer sleeve 25, the outer edge of the elastic support plate 22 fits against the inner wall of the outer sleeve 25, and the inner diameter of each outer sleeve 25 is larger than the outer diameter of each gas cylinder 3.

[0045] It should be noted that an outer lifting frame 21 is arranged on the part of the lifting and fixing device 2 inside the filling platform 1. The bottom column 24 and the outer sleeve 25 are both inside the outer lifting frame 21, and the internal cylinder 23 is arranged at the bottom position of the outer lifting frame 21.

[0046] In an alternative embodiment, spiral air channels 251 are respectively arranged inside each outer sleeve 25. An air pump 28 and an air chamber 27 are also fixed on the movable bottom plate 26. Each spiral air channel 251 is connected to the air outlet of the air pump 28 through a cavity inside the movable bottom plate 26, or each spiral air channel 251 is directly connected to the air outlet of the air pump 28 through an air duct; The air inlet of the air pump 28 is connected to the air chamber 27. An air inlet with a one-way valve is arranged on the shell of the air chamber 27. A refrigeration component is arranged inside the air chamber 27. The gas inhaled into the cavity of the air chamber 27 is cooled and then discharged into each spiral air channel 251 through the air pump 28. The air outlets of each spiral air channel 251 are arranged at the outer wall position of the outer sleeve 25 near the top.

[0047] It should be noted that the refrigeration components in the air chamber 27, namely the thermoelectric cooler, the heat dissipation fins, the cooling fan and the heat conduction plate, have the hot end of the thermoelectric cooler facing outward and the cold end facing inward. The heat dissipation fins are fixed to the hot end, the cooling fan is used to accelerate heat dissipation, the heat conduction plate is connected to the cold end, and a temperature sensor is also provided in the air chamber, which is connected to the controller. The controller adjusts the current magnitude of the thermoelectric cooler according to the detected temperature.

[0048] In an alternative embodiment, adjustment air ports 252 are respectively arranged at the air outlet positions of each spiral air duct 251. Each adjustment air port 252 includes an adjustment air duct 2521 that penetrates inside and outside the outer sleeve 25. The adjustment air duct 2521 communicates with the spiral air duct 251. An adjustment air core 2522 is slidably connected in the adjustment air duct 2521, and a spring is connected to the position of the adjustment air core 2522 close to the outer side of the outer sleeve 25. When the gas cylinder 3 in the outer sleeve 25 does not leak, the adjustment air core 2522 is pushed by the spring to the inner side position of the adjustment air duct 2521. At this time, the spiral air duct 251 communicates with the outside through the adjustment air duct 2521. Thus, the cold air in the air chamber 27 is discharged into the spiral air duct 251 by the air pump 28 and discharged through the outside of the adjustment air duct 2521. When the gas cylinder 3 in the outer sleeve 25 leaks, the adjustment air core 2522 is pushed outward by the air pressure in the outer sleeve 25. At this time, the spiral air duct 251 communicates with the internal cavity of the outer sleeve 25 through the adjustment air duct 2521. Thus, the leaked chemical gas in the outer sleeve 25 is inhaled into the air chamber 27 by the air pump 28 through the adjustment air duct 2521, and when the temperature in the air chamber 27 rises due to the charged gas, it can be cooled by the refrigeration components.

[0049] It should be noted that the air pump 28 is a reversible air pump, which drives the impeller to rotate through the motor. When the impeller rotates, it pushes the gas to flow. When the motor rotates forward, the gas is inhaled from the air inlet and discharged from the air outlet; when the motor rotates in reverse, the gas flow direction is opposite, inhaled from the original air outlet and discharged from the air inlet, and the bidirectional flow of the gas is realized by switching the rotation direction of the motor.

[0050] It should be noted that limit structures, such as bosses, are arranged at both the inner and outer ends of the adjustment air duct 2521 to limit the adjustment air core 2522 to slide in the adjustment air duct 2521. When the adjustment air core 2522 moves to the innermost side of the adjustment air duct 2521, the outer end of the adjustment air core 2522 covers a part of the spiral air duct 251. During the outward sliding process of the adjustment air core 2522, before the outer side of the adjustment air core 2522 completely covers the spiral air duct 251, the inner side of the adjustment air core 2522 is still located at the position where it has not moved to the spiral air duct 251, so as to prevent the inside and outside of the adjustment air duct 2521 from communicating when the adjustment air core 2522 moves to the middle position.

[0051] In an alternative embodiment, socket seats 41 are provided below the upper fixing table 4 at positions outside each connector 54. The inner walls of the socket seats 41 are attached to the outer walls of the tops of the corresponding outer sleeves 25. A deflation shut-off mechanism is provided at the position of the upper fixing table 4 within the socket seats 41 for closing the corresponding branch pipe 52 during deflation. A deflation locking mechanism is provided at the position of the lifting and fixing device 2 within the outer sleeve 25 for locking the lifting and fixing device 2 during deflation to prevent the outer sleeve 25 from being manually opened during deflation.

[0052] It should be noted that inclined chamfers are provided at the bottoms of the socket seats 41, and the chamfer directions face outward to facilitate the insertion of the tops of the outer sleeves 25 into the socket seats 41. Rubber sealing rings are provided inside the socket seats 41 to maintain a seal with the outer walls of the outer sleeves 25.

[0053] In an alternative embodiment, the deflation shut-off mechanism includes a gas pressure sensor provided within the socket seat 41 and an automatic shut-off valve 53 provided on the branch pipe 52. When the pressure sensor detects an increase in pressure, the branch pipe 52 is closed by controlling the automatic shut-off valve 53; alternatively, the deflation shut-off mechanism includes a shut-off valve provided on the branch pipe 52. The inside of the socket seat 41 is connected to the shut-off valve through a ventilation channel, and the pressure generated by the leakage pushes the valve core to move to a position where the shut-off valve is closed.

[0054] In an alternative embodiment, the deflation locking mechanism includes a pressure sensor provided within the outer sleeve 25 and an electromagnetic locking device 29 provided on the side of the lifting and fixing device 2. A side baffle 13 is provided at the position on the side of the lifting and fixing device 2 within the filling station 1. Positioning holes 131 are arranged in an array on the side baffle 13. When the pressure sensor within the outer sleeve 25 detects an increase in pressure, the locking tongue of the locking device 29 is ejected and stuck in the positioning holes 131, thereby locking the lifting and fixing device 2 in a fixed position; alternatively, the deflation locking mechanism includes a mechanical pressure locking device 29 provided on the side of the lifting and fixing device 2. A through hole is provided on the elastic support plate 22 to connect the inner cavity of the outer sleeve 25 with the bottom column 24. A ventilation channel is provided within the bottom column 24, with one end of the ventilation channel connected to the inner cavity of the outer sleeve 25 and the other end connected to the locking device 29. The pressure generated by the leakage pushes the locking tongue of the locking device 29 to move to a position where it is inserted into the positioning holes 131.

[0055] In an alternative embodiment, the filling station 1 includes a frame 11. Guide rods 15 are provided at the top of the frame 11. A lower support plate 12 is provided at a position near the bottom within the frame 11. The external cylinder 14 is fixed to the lower support plate 12. Through holes are provided in the lower support plate 12 at positions corresponding to the internal cylinders 23. The side baffle 13 is fixed above the lower support plate 12.

[0056] In an alternative embodiment, an external thread section is provided at the lower end of the connector 54, and an internal thread interface adapted to the external thread section is provided at the mouth of the gas cylinder 3; an axially penetrating inflation channel is formed inside the connector 54, and the inflation channel communicates with the channel inside the branch pipe 52. An annular gasket is embedded at the lower opening of the inflation channel. When the connector 54 is screwed into the internal thread interface of the gas cylinder 3 by threads, the annular gasket forms a sealing fit with the end face of the mouth of the gas cylinder 3; a push rod that can move axially is arranged in the inflation channel, and the upper end of the push rod is elastically connected to the top of the inflation channel by a spring, and the lower end extends below the annular gasket; when the connector 54 is completely connected to the gas cylinder 3, the lower end of the push rod abuts against and pushes open the valve core of the bottle valve inside the gas cylinder 3, so that the inflation channel communicates with the inside of the gas cylinder 3; when the connector 54 is unscrewed, the push rod resets under the action of the spring, and the valve core of the bottle valve inside the gas cylinder 3 closes under the action of its own spring force.

[0057] In an alternative embodiment, the electromagnetic locking device 29 includes a locking tongue, a return spring and an electromagnetic coil. A wedge-shaped guiding surface is provided at the end of the locking tongue, and the positioning hole 131 is a conical hole adapted to the wedge-shaped guiding surface. When the electromagnetic coil is energized, the locking tongue extends, and when it is de-energized, the return spring pushes the locking tongue back.

[0058] In an alternative embodiment, a control panel is provided on the side of the filling station 1. The control panel includes a PLC controller, a display screen and control buttons. The PLC controller is electrically connected to the external cylinder 14, the internal cylinder 23, the air pump 28, the refrigeration component and the automatic stop valve 53 respectively. The display screen is used to display the filling pressure of each gas cylinder 3, the temperature inside the air chamber 27 and the working state of the system.

[0059] In an alternative embodiment, each elastic support plate 22 is composed of a spring and a support plate. The upper and lower ends of the spring are respectively connected to the top of the bottom column 24 and the bottom of the support plate.

[0060] In an alternative embodiment, a manual valve 31 is provided on the gas cylinder 3 for manually opening and closing the gas cylinder 3.

[0061] In an alternative embodiment, lockable universal wheels are provided at the bottom of the frame 11, and an explosion-proof cabinet is provided on the side of the frame 11. A backup power supply and an emergency control system are provided inside the explosion-proof cabinet, and a transparent observation window and an emergency stop button are provided on the surface of the explosion-proof cabinet.

[0062] In an alternative embodiment, a total pressure gauge and a total flow regulating valve are provided on the main pipe 51, and a sub-pressure gauge and a sub-flow regulating valve are respectively provided on each branch pipe 52. The sub-pressure gauge and the sub-flow regulating valve are located above the upper fixing table 4, which is convenient for operators to observe and adjust.

[0063] In an alternative embodiment, a temperature sensor is provided inside the outer sleeve 25.

[0064] Steps for filling the gas cylinder: (1) Place the small gas cylinder 3 on the elastic support plate 22 at the top of the lifting and fixing device 2, so that the gas cylinder 3 is directly below the corresponding connector 54. Connect the nozzles of each gas cylinder 3 to the corresponding connector 54 to ensure a tight connection and prevent gas leakage. (2) Control the external cylinder 14 to start. Its telescopic push rod pushes the lifting and fixing device 2 to rise along the guide rod 15, driving the elastic support plate 22 to rise synchronously and top against the bottom of the gas cylinder 3, providing elastic support for the gas cylinder 3 to ensure the stability of the gas cylinder during the filling process. (3) Start the internal cylinder 23. Its telescopic push rod pushes the movable bottom plate 26 to rise. Since the outer sides of the bottoms of all outer sleeves 25 are fixed to the movable bottom plate 26, each outer sleeve 25 rises synchronously along the bottom column 24. As the outer sleeve 25 rises, its outer wall fits against the inner wall of the top through hole of the lifting and fixing device 2, gradually wrapping the gas cylinder 3 to provide protection for the outer shell and prevent the gas cylinder from being damaged due to accidental collision or shaking during the filling process. (4) Open the filling pipeline 5. The gas passes through the main pipe 51, the branch pipe 52 and the connector 54 in sequence and is filled into each gas cylinder 3. Observe the filling pressure and the state of the gas cylinder during the filling process. (5) After the filling is completed, first close the filling pipeline 5, then control the internal cylinder 23 to contract, driving the movable bottom plate 26 to descend, so that the outer sleeve 25 disengages from the gas cylinder 3 and returns to the initial position. Then control the external cylinder 14 to contract, lower the lifting and fixing device 2 and the gas cylinder 3 to the initial position. Finally, disconnect the connection between the gas cylinder 3 and the connector 54 and take out the filled gas cylinder 3.

[0065] In summary, for the gas filling device for small gas cylinders, by setting a liftable lifting and fixing device 2 in the filling station 1 and a liftable outer sleeve 25 in the lifting and fixing device 2, when filling, the outer sleeve 25 is used to wrap the gas cylinder 3, which plays multiple roles of preventing the leaked gas from escaping into the air and preventing the bouncing of the gas cylinder with loose connection. At the same time, a gas discharge shut-off mechanism and a gas discharge locking mechanism are respectively arranged above and below the cavity in the outer sleeve 25. When gas leakage occurs, by using the sealing performance of the outer sleeve 25 and through a pressure sensor or a pneumatic pushing structure, the branch pipe 52 is automatically closed immediately when gas leaks, and the lifting and fixing device 2 is automatically locked on the side baffle 13 and stops sliding, avoiding the leakage caused by opening the outer sleeve 25 during gas leakage.

[0066] For the gas filling device for small gas cylinders, by setting a spiral air duct 251 in the outer sleeve 25 and using the air pump 28 arranged on the movable bottom plate 26, the cooling gas in the air cavity 27 is introduced into the spiral air duct 251 through the air pump 28 for cooling and heat dissipation, preventing the gas cylinder from heating up due to the increase in pressure during the filling process. At the same time, using the outer sleeve 25 as a protective cover as a radiator can increase the heat dissipation efficiency while ensuring the sealing performance.

[0067] For the gas filling device for the small gas cylinder, an adjusting air port 252 is arranged at the air outlet of the spiral air passage 251. An adjusting air core 2522 and a spring are arranged in the adjusting air port 252. When there is no leakage in the gas cylinder 3 within the outer sleeve 25, the adjusting air core 2522 is pushed by the spring to the inner side position of the adjusting air passage 2521. The cold air in the air cavity 27 is discharged into the spiral air passage 251 through the air pump 28 and discharged through the outer side of the adjusting air passage 2521. When there is a leakage in the gas cylinder 3 within the outer sleeve 25, the adjusting air core 2522 is pushed outwards by the air pressure within the outer sleeve 25. The leaked chemical gas within the outer sleeve 25 is inhaled into the air cavity 27 through the adjusting air passage 2521 by the air pump 28. When the temperature in the air cavity 27 rises due to the filling of gas, it can be cooled by the refrigeration component. When there is a sudden increase due to leakage, it can also be discharged into the air cavity 27 through the spiral air passage 251 to avoid explosion caused by sudden pressure increase.

[0068] It should be noted that in this text, relational terms such as first and second are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the term "comprising", "including" or any other variant thereof is intended to cover non-exclusive inclusion, so that a process, method, article or device comprising a series of elements not only includes those elements, but also includes other elements not explicitly listed, or further includes elements inherent to such process, method, article or device. Without more limitations, the element defined by the statement "comprising one..." does not exclude the existence of additional identical elements in the process, method, article or device comprising the said element.

[0069] Although the embodiments of the present invention have been shown and described, for those of ordinary skill in the art, it can be understood that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principle and spirit of the present invention. The scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. An inflation device for a small gas cylinder, characterized in that, It includes a filling platform (1). Above the filling platform (1), an upper fixing platform (4) is connected through a guide rod (15). Above the upper fixing platform (4), a filling pipeline (5) is fixed. The filling pipeline (5) includes a main pipe (51) and a plurality of branch pipes (52). Each branch pipe (52) passes through the upper fixing platform (4) and a connector (54) is provided at the bottom of the upper fixing platform (4). Each connector (54) is used to connect a gas cylinder (3) respectively. The filling gas passes through the main pipe (51), the branch pipes (52) and the connectors (54) in sequence and then is filled into each gas cylinder (3). A jacking and fixing device (2) slides up and down on the guide rod (15). The main body part of the jacking and fixing device (2) is located inside the filling platform (1). An external cylinder (14) is fixed inside the filling platform (1). The end of the telescopic push rod of the external cylinder (14) is fixed at the bottom of the jacking and fixing device (2). At the bottom of the jacking and fixing device (2), a plurality of through holes are provided at positions corresponding to the lower sides of the respective connectors (54). Elastic support plates (22) are arranged in each through hole. The bottom of each elastic support plate (22) is supported on a bottom column (24). Each bottom column (24) is fixed inside the jacking and fixing device (2). By controlling the external cylinder (14) to push the jacking and fixing device (2) to lift, the elastic support plates (22) are made to abut against the bottom of the gas cylinder (3) to provide elastic support. An outer sleeve (25) is sleeved outside each bottom column (24). Each outer sleeve (25) slides up and down on the corresponding bottom column (24). The outer sides of the bottoms of all the outer sleeves (25) are fixed on the same movable bottom plate (26). An internal cylinder (23) is further arranged inside the jacking and fixing device (2). The end of the telescopic push rod of the internal cylinder (23) is fixed on the movable bottom plate (26). By controlling the internal cylinder (23) to push the movable bottom plate (26) to lift, each outer sleeve (25) is raised to a position where it wraps around each gas cylinder (3).

2. The inflating device for a small gas cylinder according to claim 1, characterized in that, Spiral air channels (251) in a spiral shape are respectively arranged inside each outer sleeve (25). An air pump (28) and an air cavity (27) are further fixed on the movable bottom plate (26). Each spiral air channel (251) communicates with the air outlet of the air pump (28) through a cavity inside the movable bottom plate (26), or each spiral air channel (251) directly communicates with the air outlet of the air pump (28) through an air channel. The air inlet of the air pump (28) communicates with the air cavity (27). An air inlet with a one-way valve is provided on the shell of the air cavity (27). A refrigeration component is arranged inside the air cavity (27). The gas inhaled into the cavity of the air cavity (27) is cooled and then discharged into each spiral air channel (251) through the air pump (28). The air outlets of each spiral air channel (251) are arranged at the outer wall position near the top of the outer sleeve (25).

3. The inflating device for a small gas cylinder according to claim 2, characterized in that, An adjustment air port (252) is respectively arranged at the air outlet position of each spiral air passage (251). An adjustment air passage (2521) penetrating through the inside and outside of the outer sleeve (25) is included in any one adjustment air port (252). The adjustment air passage (2521) is communicated with the spiral air passage (251). An adjustment air core (2522) is slidably connected in the adjustment air passage (2521). A spring is connected to the position of the adjustment air core (2522) close to the outer side of the outer sleeve (25). When the gas cylinder (3) in the outer sleeve (25) does not leak, the adjustment air core (2522) is pushed by the spring to the inner side position of the adjustment air passage (2521). At this time, the spiral air passage (251) is communicated with the outside through the adjustment air passage (2521). Thus, the cold air in the air cavity (27) is discharged into the spiral air passage (251) through the air pump (28) and discharged through the outside of the adjustment air passage (2521). When the gas cylinder (3) in the outer sleeve (25) leaks, the adjustment air core (2522) is pushed outwards by the air pressure in the outer sleeve (25). At this time, the spiral air passage (251) is communicated with the inner cavity of the outer sleeve (25) through the adjustment air passage (2521). Thus, the leaked chemical gas in the outer sleeve (25) is inhaled into the air cavity (27) through the adjustment air passage (2521) by the air pump (28). When the temperature in the air cavity (27) rises due to the inflow of gas, it can be cooled by the refrigeration component.

4. The inflating device for a small gas cylinder according to claim 3, characterized in that, A socket (41) is arranged below the upper fixing table (4) at the position outside each connector (54). The inner wall of each socket (41) fits on the outer wall of the corresponding top of the outer sleeve (25). A deflation shut-off valve mechanism is arranged at the position of the upper fixing table (4) in the socket (41) for closing the corresponding branch pipe (52) during deflation. A deflation locking mechanism is arranged at the position of the lifting and fixing device (2) in the outer sleeve (25) for locking the lifting and fixing device (2) during deflation to prevent the outer sleeve (25) from being manually opened during deflation.

5. The inflating device for a small gas cylinder according to claim 4, characterized in that, The deflation shut-off valve mechanism includes a gas pressure sensor arranged in the socket (41) and an automatic cut-off valve (53) arranged on the branch pipe (52). When the pressure sensor detects an increase in pressure, the branch pipe (52) is closed by controlling the automatic cut-off valve (53). Alternatively, the deflation shut-off valve mechanism includes a cut-off valve arranged on the branch pipe (52). The inside of the socket (41) is communicated with the cut-off valve through a ventilation passage. The pressure generated by the leakage pushes the valve core to move to the position of closing the cut-off valve.

6. The inflating device for a small gas cylinder according to claim 5, characterized in that, The deflation locking mechanism includes a pressure sensor arranged in the outer sleeve (25) and an electromagnetic locking device (29) arranged on the side of the lifting and fixing device (2). A side baffle (13) is arranged at the position of the inner side of the lifting and fixing device (2) in the filling table (1). Positioning holes (131) are arranged in an array on the side baffle (13). When the pressure sensor in the outer sleeve (25) detects an increase in pressure, the locking tongue of the locking device (29) pops out and is stuck in the positioning holes (131), thereby locking the lifting and fixing device (2) in a fixed position. Alternatively, the air release locking mechanism includes a mechanical pressure type locking device (29) provided on the side of the lifting and fixing device (2). A through hole is provided on the elastic support plate (22) to communicate the inner cavity of the outer sleeve (25) with the bottom column (24). An air vent passage is provided in the bottom column (24). One end of the air vent passage communicates with the inner cavity of the outer sleeve (25), and the other end communicates with the locking device (29). The pressure generated by the leakage pushes the locking tongue of the locking device (29) to move to a position where it inserts into the positioning hole (131).

7. An inflation device for a small gas cylinder according to claim 6, characterized in that, The filling station (1) includes a frame (11). The guide rod (15) is provided at the top of the frame (11). A lower support plate (12) is provided near the bottom inside the frame (11). The external cylinder (14) is fixed on the lower support plate (12). The lower support plate (12) is provided with a through hole at a position corresponding to the internal cylinder (23). The side baffle (13) is fixed above the lower support plate (12).

8. The inflating device for a small gas cylinder according to claim 6, characterized in that, The lower end of the connector (54) is provided with an external thread section, and an internal thread interface adapted to the external thread section is provided at the bottle mouth of the gas cylinder (3). An axially penetrating inflation passage is opened inside the connector (54), and the inflation passage communicates with the passage inside the branch pipe (52). An annular gasket is embedded at the lower end opening of the inflation passage. When the connector (54) is screwed into the internal thread interface of the gas cylinder (3) by a thread, the annular gasket forms a sealing fit with the bottle mouth end face of the gas cylinder (3). A push rod that can move axially is provided in the inflation passage. The upper end of the push rod is elastically connected to the top of the inflation passage through a spring, and the lower end extends below the annular gasket. When the connector (54) is completely connected to the gas cylinder (3), the lower end of the push rod abuts against the valve core of the bottle valve inside the gas cylinder (3) and pushes it open, so that the inflation passage communicates with the inside of the gas cylinder (3). When the connector (54) is screwed out, the push rod resets under the action of the spring, and the valve core of the bottle valve inside the gas cylinder (3) closes under the action of its own spring force.

9. The inflating device for a small gas cylinder according to claim 6, characterized in that, The electromagnetic locking device (29) includes a locking tongue, a return spring and an electromagnetic coil. The end of the locking tongue is provided with a wedge-shaped guiding surface. The positioning hole (131) is a tapered hole adapted to the wedge-shaped guiding surface. When the electromagnetic coil is energized, the locking tongue extends, and when it is de-energized, the return spring pushes the locking tongue to retract.

10. The inflating device for a small gas cylinder according to claim 6, wherein, A control panel is provided on the side of the filling station (1). The control panel includes a PLC controller, a display screen and control buttons. The PLC controller is electrically connected to the external cylinder (14), the internal cylinder (23), the air pump (28), the refrigeration component and the automatic cut-off valve (53) respectively. The display screen is used to display the filling pressure of each gas cylinder (3), the temperature inside the air chamber (27) and the working state of the system.

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