Device capable of automatically switching high-pressure and low-pressure purging gas cylinders

Abstract

The invention relates to the technical field of automatic gas cylinder switching, and discloses a device capable of automatically switching high-pressure and low-pressure purging gas cylinders, which comprises a mounting seat, mounting grooves are formed in two sides of the surface of the mounting seat, a main gas cylinder and a standby gas cylinder are fixedly mounted in the mounting grooves respectively, and guide pipes are fixedly mounted in the middles of the tops of the main gas cylinder and the standby gas cylinder; a rotating groove is formed in the surface of the guide pipe, an electromagnetic valve is arranged in the rotating groove, a limiting ring is fixedly installed at one end of the guide pipe, and through the arrangement of the main gas cylinder, the standby gas cylinder, the guide pipe, the electromagnetic valve, the limiting ring and the switching assembly, in the using process, personnel detect the pressure of gas through the switching assembly, and in the detection process, the detection efficiency is greatly improved. The switching assembly can switch different gas paths of the guide pipe between the main gas cylinder and the standby gas cylinder, after switching is completed, personnel replace and install the main gas cylinder, and the efficiency of rapidly replacing the high-low pressure purging gas cylinder is improved.

Description

Technical Field

[0001] The invention relates to the technical field of automatic switching gas cylinders, in particular to a device capable of automatically switching high-pressure and low-pressure purge gas cylinders. Background Art

[0002] In industrial gas applications (such as pipeline purging, equipment cleaning, and pneumatic tool supply), a primary gas cylinder (e.g., 15-30 MPa) is typically required to provide powerful purges, while a backup gas cylinder (e.g., 5-10 MPa) is used to maintain a stable airflow. Furthermore, gas cylinders are typically switched manually during use. Current devices that automatically switch between high- and low-pressure purge cylinders still have several drawbacks: Operators must manually monitor cylinder pressures. When the primary cylinder is depleted, they must close the valve and switch to the backup cylinder, resulting in operational interruptions and reduced production efficiency. Manual operation increases safety risks in hazardous environments (such as the chemical and petroleum industries). Sudden changes in airflow pressure during use can cause downstream equipment (such as precision nozzles and sensors) to malfunction or even be damaged. Traditional pressure reducing valves have slow adjustment speeds, making smooth transitions impossible. They also lack real-time monitoring of the remaining gas level in cylinders, potentially leading to system downtime due to cylinder depletion, a problem that urgently needs to be addressed. Summary of the Invention

[0003] In response to the shortcomings of the existing technology, the present invention provides a device that can automatically switch between high and low pressure purge gas cylinders, mainly to solve the problem that operators need to manually monitor the pressure of gas cylinders. When the main gas cylinder is exhausted, the valve needs to be closed and switched to the backup gas cylinder, resulting in operation interruption and affecting production efficiency. In dangerous environments (such as chemical and petroleum industries), manual operation increases safety risks. During use, sudden changes in air flow pressure may cause downstream equipment (such as precision nozzles and sensors) to work abnormally or even be damaged. Traditional pressure reducing valves have slow adjustment speeds and cannot achieve smooth transitions. They cannot monitor the remaining amount of gas cylinders in real time, and the system may shut down due to exhaustion of gas cylinders. Technical Solution

[0004] To achieve the above object, the present invention provides the following technical solutions: The cam is provided with an axial thruster which is adapted to move the cylinder to the upper and lower ends of the cylinder, and the cam is provided with an airtight seal which is adapted to move the cylinder to the upper and lower ends of the cylinder.

[0005] Furthermore, during the use of the gas cylinder, the main gas cylinder will transmit gas through the guide tube. During the transmission process, the gas inside the main gas cylinder will be detected by the pressure sensor. After the pressure sensor detects that the air pressure inside the main gas cylinder has dropped, it will start the switching component. The switching component will transmit the gas inside the spare gas cylinder through the guide tube. Then, when the air pressure inside the guide tube is too high, the overpressure detection device will transmit a signal to the electric push rod, and the electric push rod will perforate the rubber layer. The excess pressure will enter the interior of the positioning frame through the perforation, and the gas will enter the interior of the transmission tube through the positioning frame, and the gas inside the transmission tube will then enter the interior of the main gas cylinder.

[0006] Based on the above scheme, the switching assembly includes a mounting frame fixedly mounted on the surface of the limit ring, a pressure sensor is fixedly mounted on one side of the surface of the mounting frame, a controller is fixedly mounted on the side adjacent to the pressure sensor, a servo motor is fixedly mounted inside the mounting frame, two meshing gears are fixedly mounted on the output end of the servo motor, a rotating rod is fixedly mounted on the surface of the gear, a mounting ring is fixedly mounted on the middle part of the surface of the rotating rod, positioning rods are fixedly mounted on both sides of the surface of the mounting ring, and a sealing gasket is fixedly mounted on one end of the positioning rod.

[0007] As a further solution of the present invention, the inner diameter of the limit ring is adapted to the diameter of the sealing gasket, the sealing gasket is installed on the limit ring, the material of the sealing gasket is sealing rubber material, the pressure sensor transmits a signal to the controller through the power line, the controller controls the servo motor through the power line, and the servo motor can rotate the gear.

[0008] Furthermore, the setting of the switching component improves the rapid switching of the gas inside the main gas cylinder and the backup gas cylinder, and the switching component can avoid the manual switching control of the high and low pressure of the gas, thereby improving the efficiency of switching the high and backup gas cylinders.

[0009] On the basis of the above-mentioned scheme, the overpressure protection assembly includes a positioning frame fixedly installed on the surface of the limit groove, the interior of the positioning frame is slidably connected to a movable plate, a plurality of perforating needles are fixedly installed on the surface of the movable plate, electric push rods are fixedly installed on both sides of the back of the movable plate, a mounting ring is fixedly installed on the interior of the threaded tube, an electric push rod is fixedly installed on one side of the surface of the mounting ring, an arc plate is installed on one end of the electric push rod, a transmission pipe is fixedly installed on the bottom of the positioning frame, and one end of the transmission pipe passes through the main gas cylinder.

[0010] As a further solution of the present invention, one end of the piercing needle is in contact with the surface of the rubber layer, and the piercing needle can pierce the rubber layer. The piercing needle and the surface of the movable plate are connected by bolts. The size of the arc plate is adapted to the size of the limiting groove. The arc plate can seal the rubber layer after piercing. A rubber edge is provided on the back of the arc plate, and the rubber edge is in contact with the edge of the limiting groove.

[0011] Furthermore, with the setting of the overpressure protection component, when the air pressure inside the guide tube is too high during use, personnel will conduct a detection through the overpressure detection device. During the detection process, personnel can switch the excess gas inside the guide tube through the overpressure protection component, thereby improving the protection effect of the guide tube.

[0012] Based on the above scheme, a guide groove is opened on the surface of the threaded tube, the size of the guide groove is adapted to the size of the positioning bolt, the positioning bolt installs the positioning ring through the guide groove and the limiting groove, and the positioning ring installs the overpressure detection device.

[0013] Furthermore, personnel position the positioning ring through the positioning bolt. After the positioning ring is installed, the overpressure detection device will perform overpressure detection on the gas inside the guide tube.

[0014] On the basis of the above-mentioned scheme, a through groove is opened on one side of the top of the main gas cylinder, the size of which is adapted to the diameter of the transmission pipe, and a protective ring is provided inside the through groove, the size of which is adapted to the size of the through groove, and the protective ring seals the gap between the transmission pipe and the main gas cylinder.

[0015] Furthermore, personnel can use the protective ring to seal the main gas cylinder at the gap between the transmission pipe and the main gas cylinder, and during the sealing process, the occurrence of gas leakage is reduced. Beneficial effects

[0016] Compared with the prior art, the present invention provides a device that can automatically switch between high and low pressure purge gas cylinders, which has the following beneficial effects: 1. The present invention is equipped with a main gas cylinder, a spare gas cylinder, a guide tube, a solenoid valve, a limit ring and a switching component. During use, personnel detect the gas pressure through the switching component. During the detection process, the switching component can switch different gas paths of the guide tube between the main gas cylinder and the spare gas cylinder. After the switching is completed, personnel replace and install the main gas cylinder, thereby improving the efficiency of rapid replacement of high and low pressure purge gas cylinders.

[0017] 2. The present invention is provided with a threaded tube, a rubber layer, an overpressure protection component, a positioning ring, an overpressure detection device, a positioning bolt and a sealing ring. During use, personnel connect the threaded tube and the guide tube. After connecting the threaded tube, personnel sleeve the positioning ring on the surface of the threaded tube, use the positioning bolt to install and position the positioning ring, and the sealing ring seals the positioning bolt. The overpressure detection device can detect the gas inside the threaded tube, and during the detection process, personnel can remove excess gas through the overpressure protection component. When the gas source pressure rises abnormally (such as the pressure reducing valve fails or the gas cylinder pressure suddenly changes), the overpressure protection component automatically releases pressure to prevent the gas guide tube from rupturing due to excessive pressure. Overpressure may cause the pipeline interface to loosen or the seal to fail. The protection device can intervene in advance to reduce the probability of leakage accidents. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 This is a schematic diagram of the overall structure of a device capable of automatically switching between high and low pressure purge gas cylinders proposed by the present invention; Figure 2 This is a schematic diagram of the disassembled structure of a device capable of automatically switching between high and low pressure purge gas cylinders proposed by the present invention; Figure 3 This is a schematic diagram of the switching assembly structure of a device capable of automatically switching between high and low pressure purge gas cylinders proposed by the present invention; Figure 4 This is a schematic structural diagram of an overpressure protection assembly of a device capable of automatically switching between high and low pressure purge gas cylinders proposed by the present invention; Figure 5 This is a schematic diagram of the mounting structure of a device capable of automatically switching between high and low pressure purge gas cylinders proposed by the present invention.

[0019] In the figure: 1. Mounting seat; 2. Main gas cylinder; 3. Guide tube; 4. Solenoid valve; 5. Limiting ring; 6. Switching assembly; 61. Mounting frame; 62. Pressure sensor; 63. Controller; 64. Servo motor; 65. Gear; 66. Rotating rod; 67. Mounting ring; 68. Positioning rod; 69. Sealing gasket; 7. Threaded tube; 8. Rubber layer; 9. Overpressure protection assembly; 91. Positioning frame; 92. Moving plate; 93. Punching needle; 94. Electric push rod; 95. Mounting ring; 96. Arc plate; 97. Transmission tube; 10. Positioning ring; 11. Overpressure detection device; 12. Positioning bolt; 13. Sealing ring; 14. Spare gas cylinder. DETAILED DESCRIPTION

[0020] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0021] Reference Figure 1-Figure 5 , a device that can automatically switch between high and low pressure purge gas cylinders, includes a mounting base 1, mounting grooves are provided on both sides of the surface of the mounting base 1, and a main gas cylinder 2 and a spare gas cylinder 14 are fixedly installed inside the mounting grooves, a guide tube 3 is fixedly installed in the middle of the top of the main gas cylinder 2 and the spare gas cylinder 14, a rotating groove is provided on the surface of the guide tube 3, a solenoid valve 4 is provided inside the rotating groove, one end of the guide tube 3 is fixedly installed

[0022] Furthermore, during the use of the gas cylinder, the main gas cylinder 2 will transmit gas through the guide tube 3. During the transmission process, the gas inside the main gas cylinder 2 will be detected by the pressure sensor 62. After the pressure sensor 62 detects that the air pressure inside the main gas cylinder 2 is reduced, it will start the switching component 6. The switching component 6 will transmit the gas inside the spare gas cylinder 14 through the guide tube 3. Then, when the air pressure inside the guide tube 3 is too high, the overpressure detection device 11 will transmit a signal to the electric push rod 94, and the electric push rod 94 will perforate the rubber layer 8. The excess pressure will enter the interior of the positioning frame 91 through the perforation, and the gas will enter the interior of the transmission tube 97 through the positioning frame 91. The gas inside the transmission tube 97 will then enter the interior of the main gas cylinder 2.

[0023] The switching assembly 6 includes a mounting frame 61 fixedly mounted on the surface of the limit ring 5, a pressure sensor 62 fixedly mounted on one side of the surface of the mounting frame 61, a controller 63 fixedly mounted on the side adjacent to the pressure sensor 62, a servo motor 64 fixedly mounted inside the mounting frame 61, two meshing gears 65 fixedly mounted on the output end of the servo motor 64, a rotating rod 66 fixedly mounted on the surface of the gear 65, a mounting ring 67 fixedly mounted on the middle part of the surface of the rotating rod 66, positioning rods 68 fixedly mounted on both sides of the surface of the mounting ring 67, a sealing gasket 69 fixedly mounted on one end of the positioning rod 68, the diameter of the inside of the limit ring 5 is adapted to the diameter of the sealing gasket 69, the sealing gasket 69 installs the limit ring 5, and the material of the sealing gasket 69 is sealing rubber. The pressure sensor 62 transmits signals to the controller 63 through the power line, and the controller 63 controls the servo motor 64 through the power line, and the servo motor 64 can rotate the gear 65.

[0024] Furthermore, the pressure sensor 62 and the controller 63 are installed through the installation frame 61. After the pressure sensor 62 and the controller 63 are installed, the positioning frame 61 detects that the air pressure output by the main gas cylinder 2 is gradually decreasing, and the pressure sensor 62 transmits the signal to the controller 63. Then the controller 63 connects the servo motor 64 to the power supply. At the same time, the controller 63 closes the battery valve 4 at the output end of the main gas cylinder 2 and opens the battery valve 4 at the output end of the spare gas cylinder 14. The output end of the servo motor 64 will drive the gear 65 to rotate. When the gear 65 rotates, it will drive the rotating rod 66 to rotate. The rotating rod 66 drives the sealing gasket 69 at one end of the positioning rod 68 to rotate through the installation ring 67. The sealing gasket 69 seals the guide tube 3 at one end of the main gas cylinder 2 through the limit ring 5, thereby improving the efficiency of replacing and switching the gas cylinders.

[0025] The overpressure protection assembly 9 includes a positioning frame 91 fixedly mounted on the surface of the limit groove, a movable plate 92 is slidably connected to the interior of the positioning frame 91, a plurality of piercing needles 93 are fixedly mounted on the surface of the movable plate 92, electric push rods 94 are fixedly mounted on both sides of the back of the movable plate 92, a mounting ring 95 is fixedly mounted on the interior of the threaded tube 7, an electric push rod 94 is fixedly mounted on one side of the surface of the mounting ring 95, an arc plate 96 is mounted on one end of the electric push rod 94, a transmission pipe 97 is fixedly mounted on the bottom of the positioning frame 91, one end of the transmission pipe 97 passes through the main gas cylinder 2, and one end of the piercing needle 93 is in contact with the surface of the rubber layer 8 The piercing needle 93 can pierce the rubber layer 8. The piercing needle 93 and the surface of the movable plate 92 are connected by bolts. The size of the arc plate 96 is adapted to the size of the limiting groove. The arc plate 96 can seal the perforated rubber layer 8. A rubber edge is provided on the back of the arc plate 96. The rubber edge contacts the edge of the limiting groove. A through groove is provided on one side of the top of the main gas cylinder 2. The size of the through groove is adapted to the diameter of the transmission pipe 97. A protective ring is provided inside the through groove. The size of the protective ring is adapted to the size of the through groove. The protective ring seals the gap between the transmission pipe 97 and the main gas cylinder 2.

[0026] Furthermore, during use, personnel install the overpressure detection device 11 through the positioning ring 10. After the overpressure detection device 11 is installed, the overpressure detection device 11 will detect the air pressure inside the threaded tube 7. When it detects that the air pressure inside the threaded tube 7 is too high, it will drive the two electric push rods 94 to start, and one of the electric push rods 94 will drive the arc plate 96 to move upward, and the other electric push rod 94 will drive the movable plate 92 to move forward through the positioning frame 91. When the movable plate 92 moves forward, the rubber layer 8 will be perforated by the perforating needle 93 set on the surface of the movable plate 92. After perforation, excess gas will enter the interior of the positioning frame 91 through the threaded tube 7, and the gas entering the interior of the positioning frame 91 will then enter the interior of the main gas cylinder 2 through the transmission pipe 97. The gas entering the interior of the main gas cylinder 2 is then stored to prevent the gas guide pipe from rupturing due to excessive pressure. Overpressure may cause the pipeline interface to loosen or the seal to fail. The protection device can intervene in advance to reduce the probability of leakage accidents.

[0027] A guide groove is provided on the surface of the threaded tube 7 , the size of which matches that of the positioning bolt 12 . The positioning bolt 12 is installed on the positioning ring 10 through the guide groove and the limiting groove, and the positioning ring 10 is installed on the overpressure detection device 11 .

[0028] Furthermore, the personnel put the positioning ring 10 on the surface of the threaded tube 7, and then rotate the positioning bolt 12 through the limiting groove and the guide groove. The positioning bolt 12 screws the positioning ring 10 to the surface of the threaded tube 7, and the surface of the positioning ring 10 is fixedly installed with the overpressure detection device 11. Working principle: When the gas cylinder is in use, the main gas cylinder 2 will transmit the gas through the guide tube 3. During the transmission process, the pressure sensor 62 detects that the gas pressure output by the main gas cylinder 2 is gradually decreasing. The pressure sensor 62 transmits the signal to the controller 63. Then the controller 63 connects the servo motor 64 to the power supply. At the same time, the controller 63 closes the battery valve 4 at the output end of the main gas cylinder 2 and opens the battery valve 4 at the output end of the spare gas cylinder 14. The output end of the servo motor 64 will drive the gear 65 to rotate. When the gear 65 rotates, it will drive the rotating rod 66 to rotate. The rotating rod 66 drives the sealing gasket 69 at one end of the positioning rod 68 to rotate through the mounting ring 67. The sealing gasket 69 seals the guide tube 3 at one end of the main gas cylinder 2 through the limit ring 5, which improves the efficiency of replacing and switching the gas cylinders. When the overpressure detection device 11 detects that the air pressure inside the threaded tube 7 is too high, it will drive the two electric push rods 94 to start, one of the electric push rods 94 will drive the arc plate 96 to move upward, and the other electric push rod 94 will drive the movable plate 92 to move forward through the positioning frame 91. When the movable plate 92 moves forward, the rubber layer 8 will be perforated by the perforating needle 93 set on the surface of the movable plate 92. After perforation, excess gas will enter the interior of the positioning frame 91 through the threaded tube 7, and the gas entering the interior of the positioning frame 91 will then enter the interior of the main gas cylinder 2 through the transmission pipe 97. The gas entering the interior of the main gas cylinder 2 will then be stored to prevent the gas guide tube from rupturing due to excessive pressure. Overpressure may cause the pipeline interface to loosen or the seal to fail. The protection device can intervene in advance to reduce the probability of leakage accidents.

[0029] The electrical components mentioned in this article are all connected to an external main controller and 220V mains electricity, and the main controller can be a conventional known device that performs control such as a computer.

[0030] In the description herein, it should be noted that, unless otherwise expressly specified or limited, the terms "connected" and "connection" should be understood broadly. For example, they may refer to fixed connections, detachable connections, or integral connections; they may refer to mechanical connections, electrical connections, direct connections, or indirect connections through an intermediary. Those skilled in the art will understand the specific meanings of the above terms in the present invention based on the specific circumstances.

[0031] In the description herein, it should be noted that relational terms such as first and second, etc., are used only 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. Furthermore, the terms "include," "comprise," or any other variations thereof are intended to encompass non-exclusive inclusion, such that a process, method, article, or apparatus that includes a list of elements includes not only those elements but also other elements not explicitly listed, or elements inherent to such process, method, article, or apparatus.

[0032] While embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions, and variations may be made to these embodiments without departing from the principles and spirit of the invention, and that the scope of the invention is defined by the appended claims and their equivalents.

Claims

1. A device capable of automatically switching between high and low pressure purge gas cylinders, comprising a mounting base (1), characterized in that: Both sides of the surface of the mounting seat (1) are provided with mounting grooves, and the main gas cylinder (2) and the spare gas cylinder (14) are fixedly installed in the interior of the mounting grooves respectively. A guide tube (3) is fixedly installed in the middle of the top of the main gas cylinder (2) and the spare gas cylinder (14). The surface of the guide tube (3) is provided with a rotation groove, and the interior of the rotation groove is provided with a solenoid valve (4). One end of the guide tube (3) is fixedly installed with a limit ring (5), and the interior of the limit ring (5) is provided with a switching component (6). One end of the guide tube (3) is fixedly installed on one side of the surface of the limit ring (5). The limit ring (5) A threaded groove is provided inside the threaded groove, a threaded tube (7) is connected to the threaded groove inside the threaded groove, a limiting groove is provided on the surface of the threaded tube (7), a rubber layer (8) is provided inside the limiting groove, an overpressure protection component (9) is fixedly mounted on the surface of the limiting groove, a positioning ring (10) is sleeved on the surface of the threaded tube (7), an overpressure detection device (11) is fixedly mounted on the surface of the positioning ring (10), a limiting groove is provided on one side of the surface of the positioning ring (10), a positioning bolt (12) is connected to the threaded groove inside the limiting groove, and a sealing ring (13) is sleeved on the surface of the positioning bolt (12).

2. The device capable of automatically switching between high and low pressure purge gas cylinders according to claim 1, characterized in that: The switching assembly (6) includes a mounting frame (61) fixedly mounted on the surface of the limiting ring (5), a pressure sensor (62) fixedly mounted on one side of the surface of the mounting frame (61), a controller (63) fixedly mounted on the side adjacent to the pressure sensor (62), a servo motor (64) fixedly mounted inside the mounting frame (61), two meshing gears (65) fixedly mounted on the output end of the servo motor (64), a rotating rod (66) fixedly mounted on the surface of the gear (65), a mounting ring (67) fixedly mounted in the middle of the surface of the rotating rod (66), positioning rods (68) fixedly mounted on both sides of the surface of the mounting ring (67), and a sealing gasket (69) fixedly mounted on one end of the positioning rod (68).

3. The device capable of automatically switching between high and low pressure purge gas cylinders according to claim 2, characterized in that: The inner diameter of the limiting ring (5) is matched with the diameter of the sealing gasket (69), and the sealing gasket (69) is used to install the limiting ring (5). The material of the sealing gasket (69) is a sealing rubber material.

4. The device capable of automatically switching between high and low pressure purge gas cylinders according to claim 2, characterized in that: The pressure sensor (62) transmits a signal to the controller (63) via a power line, and the controller (63) controls the servo motor (64) via the power line, and the servo motor (64) can rotate the gear (65).

5. The device capable of automatically switching between high and low pressure purge gas cylinders according to claim 1, characterized in that: The overpressure protection assembly (9) comprises a positioning frame (91) fixedly mounted on the surface of the limiting groove, a movable plate (92) is slidably connected to the interior of the positioning frame (91), a plurality of piercing needles (93) are fixedly mounted on the surface of the movable plate (92), electric push rods (94) are fixedly mounted on both sides of the back of the movable plate (92), a mounting ring (95) is fixedly mounted on the interior of the threaded tube (7), an electric push rod (94) is fixedly mounted on one side of the surface of the mounting ring (95), an arc plate (96) is mounted on one end of the electric push rod (94), a transmission pipe (97) is fixedly mounted on the bottom of the positioning frame (91), and one end of the transmission pipe (97) passes through the main gas cylinder (2).

6. The device capable of automatically switching between high and low pressure purge gas cylinders according to claim 5, characterized in that: One end of the piercing needle (93) contacts the surface of the rubber layer (8), and the piercing needle (93) can pierce the rubber layer (8). The piercing needle (93) and the surface of the movable plate (92) are connected by bolts.

7. The device capable of automatically switching between high and low pressure purge gas cylinders according to claim 5, characterized in that: The size of the arc plate (96) is adapted to the size of the limiting groove, and the arc plate (96) can seal the perforated rubber layer (8). A rubber edge is provided on the back of the arc plate (96), and the rubber edge contacts the edge of the limiting groove.

8. The device capable of automatically switching between high and low pressure purge gas cylinders according to claim 1, characterized in that: A guide groove is provided on the surface of the threaded tube (7), the size of the guide groove being adapted to the size of the positioning bolt (12), the positioning bolt (12) being installed on the positioning ring (10) through the guide groove and the limiting groove, and the positioning ring (10) being installed on the overpressure detection device (11).

9. The device capable of automatically switching between high and low pressure purge gas cylinders according to claim 1, characterized in that: A through groove is provided on one side of the top of the main gas cylinder (2), the size of the through groove being adapted to the diameter of the transmission tube (97), a protective ring is provided inside the through groove, the size of the protective ring being adapted to the size of the through groove, and the protective ring seals the gap between the transmission tube (97) and the main gas cylinder (2).

Images