Semi-automatic special gas switching equipment and use method thereof

Abstract

The semi-automatic special gas switching equipment comprises a first gas inlet mechanism, a first main gas circuit, a second gas inlet mechanism and a second main gas circuit, and the first main gas circuit comprises a third one-way valve, a switching pressure reducer, a first one-way valve, a five-way valve, an output pressure reducer, an output pressure gauge and a gas outlet connector which are sequentially connected; the third one-way valve is communicated with the first air inlet mechanism; the second main gas circuit comprises a fourth one-way valve, a set pressure reducer, a second one-way valve, a five-way valve, an output pressure reducer, an output pressure gauge and a gas outlet connector which are connected in sequence; the fourth one-way valve communicates with a second air inlet mechanism; a handle is arranged on the switching pressure reducer, the pressure when an arrow of the handle points to the left side or the right side and the pressure of the set pressure reducer are preset, and adjustment in the gas supply process is not needed. The problem of blow-by in the gas supply process can be solved, and safety is guaranteed; and in addition, the stable state can be kept in the gas conveying process, and the gas supply safety is greatly improved.

Description

Technical Field

[0001] This invention belongs to the field of gas supply supporting facilities, specifically relating to a semi-automatic special gas switching device and its usage method. Background Technology

[0002] Nowadays, laboratories, pharmaceutical factories, chemical plants, nuclear power plants and other settings require the use of a variety of gases, including special gases. Different special gases have different chemical and physical properties, such as flammability, explosiveness, toxicity, corrosiveness, etc., and are highly dangerous.

[0003] In the construction and operation of laboratories, pharmaceutical plants, chemical plants, nuclear power plants, and other similar facilities, the design of special gas pipeline control is of paramount importance. It directly affects the smooth progress of experiments and production, the safety of personnel, and the stable operation of equipment. Even the slightest oversight can lead to safety accidents and irreparable losses.

[0004] Most of the aforementioned special gases are transported using steel cylinders as the gas source, but these cylinders require depressurization before normal use. If the special gas in a steel cylinder is used up, the device must be shut down and a new cylinder replaced before it can be used again. This may lead to interruptions in experiments or production, resulting in adverse consequences.

[0005] Therefore, it is necessary to design an automatic switching device for special gases to ensure uninterrupted supply of special gases during experiments and production processes.

[0006] Chinese patent CN208951695U discloses a semi-automatic gas switching system. Its inlet port is equipped with an inlet balloon valve, meaning the gas enters the gas switching system from a gas cylinder via the inlet balloon valve. Its disadvantages are: (1) the inlet balloon valve has poor adjustability (no pressure reduction function), and the gas pressure fluctuates continuously and is unstable during the process of the gas entering the gas switching system via the inlet balloon valve; (2) the existing patent has adjustable pressure reducing valves (left and right pressure reducing valves) in its two pressure reducing gas paths, so the pressure in the two pressure reducing gas paths also fluctuates continuously. When switching gases, the required pressure value cannot be achieved (requiring multiple pressure adjustments and multiple venting operations to achieve the required pressure), and the pressure is unstable. Unstable gas pressure poses a significant safety hazard due to venting, which is fatal for special gases. If special gases use this existing gas switching system, it can easily cause flammable and explosive accidents, and safety cannot be guaranteed.

[0007] Furthermore, the pressure-reducing pipeline and purging and venting pipeline of the aforementioned Chinese patents are prone to cross-contamination. In some existing switching systems, the purging interface is connected in series with the main gas path (pressure-reducing pipeline), posing a significant hidden danger. This could lead to experimental failure and economic losses at best, and serious safety accidents such as fires, explosions, and poisoning at worst.

[0008] In summary, a semi-automatic switching device for special gases needs to be designed, and the intake gas pressure and pipeline pressure need to be stably controlled, and cross-contamination between the pressure reducing pipeline and the purging pipeline needs to be prevented. Summary of the Invention

[0009] To solve the above-mentioned technical problems, the present invention aims to provide a semi-automatic switching device for special gases that can avoid gas leakage during the switching process from high pressure to low pressure, stabilize the gas pressure, and keep the pressure difference within 0.002 when reused to ensure gas supply safety.

[0010] The present invention also discloses a method for using the above-mentioned semi-automatic special gas switching device.

[0011] The technical solution of the present invention includes the following: A semi-automatic special gas switching device includes a first air intake mechanism, a first main air path, a second air intake mechanism, and a second main air path. The first main air path includes a third one-way valve, a switching pressure regulator, a first one-way valve, a five-way valve, an output pressure regulator, an output pressure gauge, and an air outlet connected in sequence. The third one-way valve is connected to the first air intake mechanism. The second main air path includes a fourth one-way valve, a set pressure pressure regulator, a second one-way valve, the five-way valve, an output pressure regulator, an output pressure gauge, and an air outlet connected in sequence. The fourth one-way valve is connected to the second air intake mechanism. The switching pressure regulator is equipped with a handle, and the pressure when the handle's arrow points to the left or right, as well as the pressure of the set pressure pressure regulator, are preset and do not need to be adjusted during the gas supply process.

[0012] Furthermore, the device is only responsible for switching between the first main gas path and the second main gas path; the pressure of the first main gas path before the output pressure reducer and the second main gas path before the output pressure reducer are stabilized.

[0013] Furthermore, the first intake mechanism includes: a first intake port, a first intake control valve, a first inlet pressure reducer, a first exhaust purge control valve, and a first purge exhaust port connected in sequence; the second intake mechanism includes: a second intake port, a second intake control valve, a second inlet pressure reducer, a second exhaust purge control valve, and a second purge exhaust port connected in sequence.

[0014] Furthermore, both the first and second inlet pressure regulators can instantly adjust the external air pressure to the required pressure. Both the first and second inlet pressure regulators include a body, a pressure adjusting screw, a plane bearing, a low-pressure spring, a slider, a nozzle, a high-pressure spring, a piston shaft, an inlet, an outlet, a piston, and a plunger. The pressure adjusting screw is set at the top of the body, and the pressure adjusting screw is connected downward to the plane bearing. The plane bearing is connected downward to the low-pressure spring, and the low-pressure spring is connected downward to the slider. A piston is set inside the slider, and a plunger is set inside the piston. The plunger contacts the piston shaft below, and the piston shaft passes through the nozzle and the high-pressure spring from top to bottom.

[0015] Furthermore, the first intake control valve and the second intake control valve are configured as diaphragm valves; a fifth check valve is provided between the first inlet pressure reducer and the first exhaust purge control valve; and a sixth check valve is provided between the second inlet pressure reducer and the second exhaust purge control valve.

[0016] Furthermore, both the pressure reducing switch and the pressure setting switch are equipped with pressure gauges.

[0017] Furthermore, a safety valve and a pressure gauge are also installed on the five-way valve.

[0018] Furthermore, the output pressure of the output pressure reducer is adjustable, and the output pressure gauge is installed on the output pressure reducer.

[0019] A method for using a semi-automatic special gas switching device, the method comprising: (1) System preset P 右 Pressure values ​​of P1 and P2: The preset output pressure value of the pressure regulator is P. 右 When the handle arrow points to the right, the preset output pressure value of the pressure regulator is P1; when the handle arrow points to the left, the preset output pressure value of the pressure regulator is P2. 右 = (P1+P2) / 2, P2>P1, and the hand arrow can only be rotated 180°; (2) Setting the priority air supply side: When the handle arrow points to the right, the second main air path is set as the priority air supply side; since P1 < P 右 Therefore, the second main air circuit is in operation, while the first main air circuit is on standby; similarly, when the handle arrow points to the left, the first main air circuit is set as the priority air supply side; since P2 > P 右 Therefore, the first main gas line is given priority for gas supply, and the second main gas line is reserved for backup; (3) Open the first air intake mechanism and the second air intake mechanism, and supply air to the priority air supply side set in step (2); (4) When the gas pressure on the priority gas supply side decreases and falls below the preset pressure, first turn the handle arrow 180° to switch to the backup gas supply side: When the actual output pressure value of the pressure regulator is less than P1, first turn the handle arrow 180° to switch the air supply from the second main air circuit to the first main air circuit. Similarly, when the actual output pressure value of the pressure regulator is less than P 右 When switching the air supply, first turn the handle arrow 180° to switch the air supply from the first main air path to the second main air path; (5) Replace the gas cylinder on the preferred gas supply side in step (4); (6) The backup gas supply side in step (4) becomes the priority gas supply side in the new round, and the gas supply side with the newly replaced gas cylinder becomes the backup gas supply side in the new round, and the gas supply continues uninterrupted.

[0020] Furthermore, in step (2): when both the left and right gas cylinders are full, the device can arbitrarily set the priority gas supply side and the backup gas supply side, and point the handle arrow to the priority gas supply side.

[0021] Compared with the prior art, the present invention has the following advantages: (1) Using the semi-automatic special gas switching device of the present invention, when the pressure drops after the gas on the priority gas supply side is exhausted, it will automatically switch to the backup gas supply side, thus ensuring a continuous supply of special gas and ensuring the continuity of experiments and production.

[0022] (2) The semi-automatic special gas switching device of the present invention is provided with a first air intake control valve and a second air intake control valve at the air intake interface, which can perform preliminary throttling control on the air intake flow rate.

[0023] In addition, a first inlet pressure reducer and a second inlet pressure reducer are respectively installed after the first inlet control valve and the second inlet control valve to control the flow rate again: the first inlet pressure reducer and the second inlet pressure reducer can adjust the pressure instantly to ensure that the gas supply pressure entering the switching equipment through the first inlet pressure reducer and the second inlet pressure reducer remains stable (e.g., if the gas cylinder pressure is 20MPa, it can be directly adjusted to 2.5MPa through the inlet control valve before entering the switching equipment).

[0024] (3) The pressure value of the semi-automatic special gas switching device of the present invention is preset (P) 右 (P1, P2) does not require adjustment during the gas supply process and can maintain a stable state during gas delivery (the pressure from the inlet air control valve to the output pressure reducer is stable). The device of this invention is only responsible for switching the two gas supply sides and does not need to adjust the pressure within the gas supply side.

[0025] (4) In the semi-automatic special gas switching device of the present invention, there is no cross-flow between each purge and discharge gas path and the corresponding main gas path. Each main gas path is equipped with two one-way valves and the purge and discharge gas path is also equipped with one-way valves. Therefore, the purge and discharge pipeline and the corresponding main gas path have their own independent functions and no cross-flow occurs. This can solve the cross-flow problem in the gas supply process and ensure safety.

[0026] All of the above improvements have greatly enhanced the safety of special gas supply.

[0027] In summary, this invention ensures that there is no risk of cross-contamination between valves regardless of changes in intake pressure, while also avoiding the safety hazards associated with adjusting the pressure regulator for venting when switching gases.

[0028] The device of this invention avoids the safety problems caused by disassembly, pressure adjustment, and venting during use. This invention is applicable to various gases and has a wide range of applications, especially for switching between special gases. Attached Figure Description

[0029] Figure 1 This is a schematic diagram of the semi-automatic special gas switching device of the present invention; Figure 2 Limit diagram for switching the pressure reducer; Figure 3 This is a cross-sectional view of the first intake control valve and the second intake control valve; Figure 4 A schematic diagram of the first and second intake control valves (viewpoint 1); Figure 5 A schematic diagram of the first and second intake control valves (viewpoint 2); Figure 6 Cross-sectional views of the first inlet pressure reducer and the second inlet pressure reducer; Wherein, 1: First air intake port; 2: Second air intake port; 3: First air intake control valve; 4: Second air intake control valve; 5: First exhaust purge control valve; 6: Second exhaust purge control valve; 7: First purge exhaust port; 8: Second purge exhaust port; 9: Switching pressure regulator; 10: Setting pressure pressure regulator; 11: First check valve; 12: Second check valve; 13: Safety valve; 14: First pressure gauge; 15: Second pressure gauge; 16: Output pressure regulator; 17: Air outlet port; 18: Output pressure gauge; 19: Third check valve; 20: Fourth check valve; 21: Fifth check valve; 22: Sixth check valve; 23: First inlet pressure regulator; 24: Second inlet pressure regulator.

[0030] 31: Handle; 32: Upper valve stem; 33: Valve cap nut; 34: Button; 35: Diaphragm; 36: Lower valve stem; 37: Valve seat; 38: Spring; 39: Valve body.

[0031] 231: Pressure adjusting screw; 232: Surface bearing; 233: Low-pressure spring; 234: Slider; 235: Nozzle; 236: High-pressure spring; 237: Piston shaft; 238: Inlet; 239: Outlet; 2310: Piston; 2311: Plunger. Detailed Implementation

[0032] The specific embodiments of the present invention will now be described in conjunction with the accompanying drawings and examples. Example 1

[0033] Reference Figure 1 As shown, the semi-automatic special gas switching device in this embodiment is symmetrically arranged, including a first air intake mechanism and a corresponding first main air passage, as well as a second air intake mechanism and a corresponding second main air passage.

[0034] The first and second air intake mechanisms are symmetrically arranged and located on the left and right sides of the semi-automatic special gas switching device, respectively.

[0035] The first air intake mechanism includes a first air intake port 1, a first air intake control valve 3, a first exhaust purge control valve 5, a first purge discharge port 7, and a first inlet pressure reducer 23. The first air intake port 1 is connected to the first air intake control valve 3, which is connected to the first inlet pressure reducer 23 (and via a third one-way valve 19 to a switching pressure reducer 9). The first air intake control valve 3 is connected to the aforementioned first inlet pressure reducer 23 and is connected to the first exhaust purge control valve 5 via a pipeline. The first purge discharge port 7 is located at the end of the first exhaust purge control valve 5. During pressure reduction, the first air intake control valve 3 and the first inlet pressure reducer 23 are open to supply air to the main air circuit, while the first exhaust purge control valve 5 is closed. During purge discharge, the first air intake control valve 3 and the first inlet pressure reducer 23 are open, and the first exhaust purge control valve 5 is also open, allowing for purge discharge and ensuring that the gas in the system is purged after the gas exchange cylinder is used.

[0036] Similarly, the second intake mechanism includes a second intake port 2, a second intake control valve 4, a second exhaust purge control valve 6, a second purge discharge port 8, and a second inlet pressure reducer 24. The second intake port 2 is connected to the second intake control valve 4, which is connected to the second inlet pressure reducer 24 (and via a fourth check valve 20 to the set pressure pressure reducer 10). The second intake control valve 4 is connected to the second inlet pressure reducer 24 and to the second exhaust purge control valve 6 via a pipeline. The second purge discharge port 8 is located at the end of the second exhaust purge control valve 6. When pressure reduction is in operation, the second intake control valve 4 and the second inlet pressure reducer 24 are open to supply gas to the main gas path, while the second exhaust purge control valve 6 is closed. When purging, the second intake control valve 4 and the second inlet pressure reducer 24 are open, and the second exhaust purge control valve 6 is also open, allowing for purging and ensuring that the gas in the system is purged after the gas exchange cylinder is used.

[0037] Preferably, the first intake control valve 3 and the second intake control valve 4 are configured as diaphragm valves, with the following structure: Figure 3 As shown, using a diaphragm as a sealing element can achieve a good sealing effect. When a special gas enters from one side of the valve body, it flows out from the other side under the control of the diaphragm, which has good throttling and shut-off performance and is suitable for occasions that require precise flow control.

[0038] Preferably, both the first inlet pressure regulator 23 and the second inlet pressure regulator 24 can achieve instantaneous pressure adjustment and control to stabilize the gas pressure, thus performing the function of primary pressure reduction. For example, if the gas cylinder pressure is 20MPa, it can be directly adjusted to a unified pressure of 2.5MPa by the first inlet pressure regulator 23 and the second inlet pressure regulator 24 before entering the switching equipment.

[0039] The first inlet pressure reducer 23 and the second inlet pressure reducer 24 have the same structure. The following description will take the first inlet pressure reducer 23 as an example.

[0040] like Figure 6 As shown, the first inlet pressure reducer 23 includes a body, a pressure adjusting screw 231, a plane bearing 232, a low-pressure spring 233, a slider 234, a nozzle 235, a high-pressure spring 236, a piston shaft 237, an inlet 238, an outlet 239, a piston 2310, and a plunger 2311. The pressure adjusting screw 231 is located at the top of the body, and it connects downwards to the plane bearing 232. The plane bearing 232 connects downwards to the low-pressure spring 233, which in turn connects downwards to the slider 234. The piston 2310 is located inside the slider 234, and the plunger 2311 is located inside the piston 2310. The plunger 2311 contacts the piston shaft 237 below, and the piston shaft 237 passes through the nozzle 235 and the high-pressure spring 236 sequentially from top to bottom.

[0041] When gas enters piston 2310 through inlet 238, it pushes plane bearing 232 through pressure adjusting screw 231. Plane bearing 232 pushes low-pressure spring 233. Low-pressure spring 233 pushes slider 234. Slider 234 pushes piston shaft 237 to move, thereby pushing plunger 2311 inside piston 2310 to move, thereby reducing pressure on piston 2310.

[0042] Preferably, a fifth check valve 21 is installed between the first inlet pressure reducer 23 and the first exhaust purge control valve 5, and a sixth check valve 22 is installed between the second inlet pressure reducer 24 and the second exhaust purge control valve 6. That is, check valves are installed in the direction of gas flow to the purging function, so there will be no insufficient pressure or gas leakage during purging.

[0043] Preferably, the structures of the first exhaust purge control valve 5 and the second exhaust purge control valve 6 are the same as those of the first intake control valve 3 and the second intake control valve 4.

[0044] The first main air path includes a third one-way valve 19, a switching pressure regulator 9, a first one-way valve 11, a five-way valve, an output pressure regulator 16, an output pressure gauge 18, and an air outlet 17, which are connected in sequence.

[0045] The second main air circuit includes a fourth check valve 20, a set pressure regulator 10, a second check valve 12, the aforementioned five-way valve, an output regulator 16, an output pressure gauge 18, and an air outlet 17, connected in sequence.

[0046] That is, the first and second main gas lines share a five-way connector, output pressure reducer 16, output pressure gauge 18, and outlet port 17. A five-way connector is installed between the switching pressure reducer 9 and the setting pressure pressure reducer 10. The five-way connector is connected to the output pressure reducer 16 through a pipe. The end of the output pressure reducer 16 is connected to the outlet port 17, which is connected to downstream laboratory equipment. A pressure gauge and a safety valve 13 are also installed on the five-way connector.

[0047] Preferably, a pressure gauge is connected to the front of the bottom valve, a shut-off valve is connected to the bottom of the bottom valve, and the safety valve is connected to the shut-off valve. Once the safety valve is activated, the shut-off valve can directly close the installed valve.

[0048] The output pressure of the output pressure regulator 16 is adjustable within the range of 0 to P, and the pressure can be adjusted according to actual needs. The pipeline output pressure is displayed by the output pressure gauge 18. The pressure regulating handle of the output pressure regulator 16 is rotated clockwise to increase the pressure and counterclockwise to decrease the pressure. The structure of the output pressure regulator 16 in this embodiment can adopt the structure of the gas pressure regulator in Chinese patent CN2009102653707, which will not be described in detail here.

[0049] The outlet of the first air intake mechanism is connected to the switching pressure reducer 9, and the outlet of the second air intake mechanism is connected to the setting pressure pressure reducer 10.

[0050] One-way valves are provided between the outlet of the first air intake mechanism and the switching pressure reducer 9, and between the switching pressure reducer 9 and the safety valve 13. One-way valves are provided between the outlet of the second air intake mechanism and the set pressure regulator 10, and between the set pressure regulator 10 and the safety valve 13. In this way, two one-way valves are installed in both the left and right main gas lines, providing double protection. Therefore, there is no cross-flow between each purging and discharge pipeline and its respective main gas line, which can solve the problem of cross-flow during the gas supply process and ensure safety.

[0051] The structures of the pressure regulator 9 and the pressure regulator 10 are existing technologies and will not be described in detail here.

[0052] The semi-automatic special gas switching device in this embodiment is used to adjust and control the uninterrupted gas supply of the manifold of medium and small flow compressed gas cylinders. After the gas on the priority supply side is exhausted and the pressure drops, it automatically switches to the backup gas supply side. The priority supply side and the backup gas supply side can be set by selecting the direction of the handle (arrow to the left or right).

[0053] The semi-automatic special gas switching device in this embodiment has a maximum input pressure of 3000 psi and an output pressure of 50~250 psi (including 50 psi, 75 psi, 100 psi, 150 psi, and 250 psi), and an operating temperature of -40~60℃; the leakage rate is 2*10 -8 scc / sec.

[0054] The applicable scenarios for the semi-automatic special gas switching device in this embodiment are as follows: 1. Determine the installation location of the switching equipment based on the site conditions and ease of operation. The installation site should be away from grease and flammable materials and kept clean and well-ventilated. The switching equipment is mounted on a bracket with four 8mm mounting holes, which can be used to fix it to the building wall or mounting surface with expansion bolts or bolts.

[0055] 2. The input and output terminals of the switching device (first air inlet 1, second air inlet 2, and air outlet 17) adopt threaded connections. First air inlet 1 and second air inlet 2 are MC-1 / 4 (i.e., 1 / 4 ferrule) and are connected to the manifold via high-pressure metal hoses or high-pressure pipes. Air outlet 17 is an MC-1 / 4 (i.e., 1 / 4 ferrule) and is connected to the output pipe. Depending on the ease of pipe installation, horizontal output to the left or right, or vertical output upwards, can be selected.

[0056] 3. The input and output ends of the switching equipment (first air inlet 1, second air inlet 2, and air outlet 17) are equipped with threaded protective sleeves to prevent damage to the threads and to prevent impurities from entering the pipe. These sleeves should be removed before assembly.

[0057] 4. The input and output pipelines of the switching equipment must be installed, cleaned, tested, and purged in accordance with the operating procedures. Example 2

[0058] The workflow of the semi-automatic special gas switching device using Example 1 is as follows: (1) System settings P 右 Pressure values ​​of P1 and P2: Refer to Figure 1 and Figure 2 As shown, the output pressure of the pressure regulator 10 is set to a set value, which is P. 右 The output pressure of the pressure regulator 9 is adjustable within a certain range. When the handle arrow points to the right, the output pressure value of the pressure regulator 9 is set to P1; when the handle arrow points to the left, the output pressure value of the pressure regulator 9 is set to P2. 右 = (P1+P2) / 2, P2>P1, and due to the limiting position of the locking nut, the handle arrow on the pressure reducer 9 can only be in the position where... Figure 2 Rotate within the area shown by the dashed line (i.e., only 180° can be rotated). For example: Assume P is set 右 =2.3MPa, P2=2.4 MPa, P1=2.2 MPa.

[0059] (2) Set priority gas supply side: When the handle arrow points to the right, the right main air path (second main air path) is set as the priority air supply side; since P1 < P 右 Therefore, the second main gas circuit is in operation to supply gas (the pressure regulator 10 is in operation), and the first main gas circuit is on standby (the left-side switching regulator 9 is on standby).

[0060] Similarly, when the handle arrow points to the left, the left main air path (first main air path) is set as the priority air supply side; since P2 > P 右 Therefore, the first main gas line is given priority for gas supply, while the second main gas line is reserved for backup.

[0061] (3) Open the air intake control valve and prioritize the air supply side to supply air; (4) When the gas pressure on the priority gas supply side decreases and is lower than the preset pressure (as can be seen from the pressure gauge), first turn the handle arrow 180° to switch to the backup gas supply side. Specifically: When the actual output pressure value of the right pressure regulator is less than P1, first turn the handle arrow 180° to switch to left-side operation, thus switching the gas supply from right to left.

[0062] Similarly, when the actual output pressure value of the pressure reducer on the left is less than P 右When the gas supply is switched, first turn the handle arrow 180° to switch the gas supply from the left to the right.

[0063] (5) Replace the gas cylinder on the original priority gas supply side (the priority gas supply side in step (4)); (6) The original standby gas supply side becomes the new priority gas supply side, and the gas supply side with the newly replaced gas cylinder becomes the standby gas supply side.

[0064] Preferably, in step (2): the setting of the priority gas supply side and the backup gas supply side can be arbitrarily selected: When both the left and right gas cylinders are full, the semi-automatic switching device in this embodiment can arbitrarily set the priority gas supply side and the backup gas supply side. For example... Figure 1 As shown, when the handle arrow of the left-side pressure regulator 9 points to the right, the right side is the priority air supply side; conversely, the left side is the priority air supply side. In short, the handle arrow indicates the priority air supply side.

[0065] Preferably, step (5): gas cylinder replacement and operation: When the gas supply on the priority supply side is depleted, the switching device will automatically switch to the backup supply side. The reading on the inlet pressure gauge indicates whether one side has run out of gas. To ensure uninterrupted gas supply, empty cylinders should be replaced promptly. Before replacing a cylinder, the handle should be rotated 180 degrees (i.e., the handle arrow should point towards the current supply side).

[0066] The present invention has been disclosed above with reference to preferred embodiments, but these are not intended to limit the present invention. Anyone skilled in the art can make various changes or modifications without departing from the spirit and scope of the present invention. Therefore, the scope of protection of the present invention should be defined by the scope of the claims in this application.

Claims

1. A semi-automatic special gas switching device, characterized in that, The device includes a first air intake mechanism, a first main air passage, a second air intake mechanism, and a second main air passage; The first main air circuit includes a third check valve, a switching regulator, a first check valve, a five-way valve, an output regulator, an output pressure gauge, and an air outlet, connected in sequence; the third check valve is connected to the first air intake mechanism; The second main air circuit includes a fourth one-way valve, a set pressure regulator, a second one-way valve, the five-way valve, an output regulator, an output pressure gauge, and an air outlet, connected in sequence; the fourth one-way valve is connected to the second air intake mechanism; The pressure regulator is equipped with a handle. The pressure when the handle arrow points to the left or right, as well as the pressure of the pressure regulator, are preset and do not need to be adjusted during the gas supply process.

2. The semi-automatic special gas switching device according to claim 1, characterized in that, The device is only responsible for switching between the first main gas path and the second main gas path; Pressure stabilization is achieved in the first main gas path before the output pressure reducer and in the second main gas path before the output pressure reducer.

3. A semi-automatic special gas switching device according to claim 1 or 2, characterized in that, The first intake mechanism includes: a first intake port, a first intake control valve, a first inlet pressure reducer, a first exhaust purge control valve, and a first purge exhaust port connected in sequence; The second intake mechanism includes: a second intake port, a second intake control valve, a second inlet pressure reducer, a second exhaust purge control valve, and a second purge exhaust port connected in sequence.

4. A semi-automatic special gas switching device according to claim 3, characterized in that, Both the first and second inlet pressure regulators can instantly adjust the external air pressure to the required pressure. Both the first and second inlet pressure regulators include a body, a pressure adjusting screw, a plane bearing, a low-pressure spring, a slider, a nozzle, a high-pressure spring, a piston shaft, an inlet, an outlet, a piston, and a plunger. The pressure adjusting screw is located at the top of the body, and the pressure adjusting screw is connected downward to the plane bearing. The plane bearing is connected downward to the low-pressure spring, and the low-pressure spring is connected downward to the slider. A piston is located inside the slider, and a plunger is located inside the piston. The plunger contacts the piston shaft below, and the piston shaft passes through the nozzle and the high-pressure spring from top to bottom.

5. A semi-automatic special gas switching device according to claim 3, characterized in that, The first intake control valve and the second intake control valve are configured as diaphragm valves. A fifth check valve is provided between the first inlet pressure regulator and the first discharge purge control valve; a sixth check valve is provided between the second inlet pressure regulator and the second discharge purge control valve.

6. A semi-automatic special gas switching device according to claim 1 or 2, characterized in that, Both the switching pressure reducer and the setting pressure pressure reducer are equipped with pressure gauges.

7. A semi-automatic special gas switching device according to claim 1 or 2, characterized in that, The five-way valve is also equipped with a safety valve and a pressure gauge.

8. A semi-automatic special gas switching device according to claim 1 or 2, characterized in that, The output pressure of the output pressure reducer is adjustable, and the output pressure gauge is installed on the output pressure reducer.

9. A method of using a semi-automatic special gas switching device, characterized in that, The method includes: (1) System preset P 右 Pressure values ​​of P1 and P2: The preset output pressure value of the pressure regulator is P. 右 When the handle arrow points to the right, the preset output pressure value of the pressure regulator is P1; when the handle arrow points to the left, the preset output pressure value of the pressure regulator is P2. 右 = (P1+P2) / 2, P2>P1, and the hand arrow can only be rotated 180°; (2) Setting the priority air supply side: When the handle arrow points to the right, the second main air path is set as the priority air supply side; since P1 < P 右 Therefore, the second main air circuit is in operation, while the first main air circuit is on standby; similarly, when the handle arrow points to the left, the first main air circuit is set as the priority air supply side; since P2 > P 右 Therefore, the first main gas line is given priority for gas supply, and the second main gas line is reserved for backup; (3) Open the first air intake mechanism and the second air intake mechanism, and supply air to the priority air supply side set in step (2); (4) When the gas pressure on the priority gas supply side decreases and falls below the preset pressure, first turn the handle arrow 180° to switch to the backup gas supply side: When the actual output pressure value of the pressure regulator is less than P1, first turn the handle arrow 180° to switch the air supply from the second main air circuit to the first main air circuit. Similarly, when the actual output pressure value of the pressure regulator is less than P 右 When switching to the second main air circuit, first turn the handle arrow 180° to switch the air supply from the first main air circuit to the second main air circuit. (5) Replace the gas cylinder on the preferred gas supply side in step (4); (6) The backup gas supply side in step (4) becomes the priority gas supply side in the new round, and the gas supply side with the newly replaced gas cylinder becomes the backup gas supply side in the new round, and the gas supply continues uninterrupted.

10. The method of using a semi-automatic special gas switching device according to claim 9, characterized in that, Step (2): When both the left and right gas cylinders are full, the device can arbitrarily set the priority gas supply side and the backup gas supply side, and point the handle arrow to the priority gas supply side.

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