Small gas distribution device

Abstract

The utility model provides a small gas distribution device. The small gas distribution device comprises a gas distribution steel cylinder assembly, a connecting assembly, a gas distribution control assembly and a gas inlet system which are sequentially connected. The gas distribution steel cylinder assembly comprises a portable steel cylinder, a VCR connector, a first stop valve, a second stop valve, an output pressure reducing valve and the like, the connecting assembly comprises a third stop valve and a connecting pipeline, a pressure transmitter and a gas path cleaning assembly are connected to the connecting assembly, the gas distribution control assembly comprises a panel, a plurality of control stop valves and needle valves, and the control stop valves and the needle valves are connected. The air inlet system comprises a plurality of air inlet passages, and each air inlet passage comprises an air inlet pressure reduction monitor, an air inlet stop valve and a one-way valve which are connected in sequence; the gas path cleaning assembly comprises a fourth stop valve and a vacuum pump. The small gas distribution device is small and exquisite, easy and convenient to operate, short in consumed time, small in dead volume and capable of saving gas, the pressure ratio of component gas can be accurately regulated and controlled, and two or more kinds of mixed gas can be prepared according to the specific pressure ratio.

Description

Technical Field

[0001] The utility model relates to the technical field of gas mixing, and particularly relates to a small gas distribution device. Background Art

[0002] During the chemical experiment process in a laboratory, various mixed gases with different proportions often need to be prepared. Especially when preparing isotope gases with specific concentrations, it is necessary to dilute the gas with a higher concentration, or mix multiple gases to obtain a mixed gas containing multiple components, and then conduct tests and analyses. However, the directly purchased single gas or mixed gas is expensive, and the required gas ratio is fixed and cannot be changed according to needs. The gas mixing device mixes two or more different gases in a certain proportion according to the gas components required in the laboratory and various test environments, and realizes the mixing of gases through the diffusion of gas molecules or the counterflow of two or more gases. The existing gas distribution devices still have problems such as high cost, long gas distribution time, large floor area, uneven mixing, and inability to adjust the output pressure of the mixed gas. Content of the Utility Model

[0003] In order to solve the defects of the existing technology, the utility model provides a small gas distribution device, which includes a gas distribution cylinder assembly, a connection assembly, a gas distribution control assembly, and an intake system connected in sequence. The gas distribution control assembly is used to control different gases to flow to the gas distribution cylinder assembly in sequence according to the pressure ratio of each component gas required, the gas distribution cylinder assembly is used to accommodate the mixed gas, and different gases are mixed and stored in the gas distribution cylinder assembly after entering through the gas distribution control assembly. The intake system is used to input different gases according to the set pressure ratio. The connection assembly is used to connect between the gas distribution control assembly and the gas distribution cylinder assembly.

[0004] In a specific embodiment of the present application, the gas distribution cylinder assembly includes a portable cylinder and a VCR joint. The gas distribution cylinder assembly is connected to the connection assembly through the VCR joint, and the VCR joint is detachable. When distributing gas, the portable cylinder is connected to the VCR joint, the VCR joint is connected to the connection assembly, and gas is filled into the portable cylinder. When the gas distribution is completed, the second stop valve is closed, the portable cylinder is removed from the VCR joint, and a plug is added to the interface of the portable cylinder. Even if the second stop valve is accidentally opened, there will be no air leakage. This gas distribution cylinder assembly is used to store the mixed gas, which is convenient to carry and transfer, and has high safety.

[0005] In a specific embodiment of the present application, the gas distribution cylinder assembly further includes a first stop valve and a second stop valve. The first stop valve is disposed at one end of the portable cylinder away from the VCR joint, and the second stop valve is disposed at one end of the portable cylinder close to the VCR joint and is detachably connected to the VCR joint. The second stop valve is used to control the switch at the bottom of the portable cylinder. When gas is distributed, the second stop valve is opened, and gas can enter the portable cylinder. After gas distribution is completed, the second stop valve is closed to seal the portable cylinder. The first stop valve is in a closed state to prevent the mixed gas in the portable cylinder from escaping. The volume of the portable cylinder is 0.5L, and the nominal working pressure is 10MPa. A handle is provided on the cylinder wall of the portable cylinder for easy handling.

[0006] In a specific embodiment of the present application, the connection assembly includes a connection pipeline. A third stop valve is provided at one end of the connection pipeline close to the VCR joint. The third stop valve is detachably connected to the VCR joint of the gas distribution cylinder assembly, and the end of the connection pipeline away from the VCR joint is communicated with the gas distribution control assembly. The third stop valve is used to control whether the gas in the connection pipeline enters the gas distribution cylinder assembly. When gas is distributed, the third stop valve is opened, and gas can enter the gas distribution cylinder assembly through the intake system, the gas distribution control assembly, the connection assembly, and the third stop valve. After gas distribution is completed and the residual gas in the gas distribution control assembly and the connection assembly is discharged, the third stop valve is closed.

[0007] In a specific embodiment of the present application, the connection pipeline is a four-way pipeline.

[0008] In a specific embodiment of the present application, a pressure transmitter is connected to the connection assembly. The pressure transmitter is used to monitor whether the gas entering the connection assembly from the intake system reaches the required pressure. When the pressure transmitter shows that the required air pressure is reached, the needle valve and the control stop valve connected to the intake passage are gradually closed in sequence to stop the gas input of the intake passage.

[0009] In a specific embodiment of the present application, the pressure transmitter is connected to one passage of the connection pipeline of the connection assembly.

[0010] In a specific embodiment of the present application, the gas distribution control assembly includes a plurality of gas distribution control units, and the gas distribution control unit includes a control stop valve and a needle valve connected to each other. The control stop valve is connected to a passage of the connecting pipeline of the connecting assembly through a pipeline, and the needle valve is connected to the corresponding intake passage in the intake system. The needle valve can accurately control the flow rate of the gas in the intake passage. Each control stop valve is used to control the opening and closing of the intake passage connected thereto. When air intake is required, the needle valve and the control stop valve connected to the intake passage are opened, and the gas can flow through the needle valve and the control stop valve into the connecting assembly. When the indication of the pressure transmitter connected to the connecting assembly reaches the required pressure, the needle valve is closed first, and when the indication of the pressure transmitter stabilizes at the required pressure after a period of time, the control stop valve is closed again, so that the gas in the intake passage connected to the needle valve and the control stop valve cannot enter the connecting assembly. When the intake of the intake passages of all intake systems is completed, the residual gas in the gas distribution control assembly and the connecting assembly needs to be discharged, and at this time, all control stop valves are closed.

[0011] In a specific embodiment of the present application, the intake system includes a plurality of intake passages, each of which is provided with an intake pressure reduction monitor, an intake stop valve and a one-way valve in sequence in a direction away from the valve distribution control component, and the end of the intake passage close to the one-way valve is connected to an external gas supply source. For example, the intake system in the present application may include three intake passages, namely, a first intake passage, a second intake passage, and a third intake passage, the first intake passage including a first intake pressure reduction monitor, a first intake stop valve, and a first one-way valve; the second intake passage including a second intake pressure reduction monitor, a second intake stop valve, and a second one-way valve; the third intake passage including a third intake pressure reduction monitor, a third intake stop valve, and a third one-way valve.

[0012] The gas supply source can usually be a gas cylinder containing the gas to be distributed. Those skilled in the art will know that a gas cylinder pressure reducing valve is usually provided on the gas cylinder to control the output pressure of the gas cylinder. The air intake pressure reduction monitor is used to pre-set the gas pressure reading before the intake. According to the required gas pressure ratio, the value of the air intake pressure reduction monitor is made consistent with or slightly higher than the required pressure to be filled through the gas cylinder pressure reducing valve provided on the gas cylinder, thereby achieving gas mixing with a specific pressure ratio. The one-way valve can control the single flow direction of the gas in the intake passage, prevent the gas in the intake passage from flowing back to the gas cylinder containing the gas to be distributed, and ensure the purity of the gas to be distributed. The air intake stop valve is used to control whether the external gas cylinder enters the intake passage.

[0013] In the specific embodiments of the present application, each gas distribution control unit includes a control stop valve and a needle valve, and the number of the control stop valves, needle valves and intake passages is equal; preferably, the number of the control stop valves, needle valves and intake passages is two or more, and preferably, the number of the control stop valves, needle valves and intake passages is three. Specifically, the control stop valve and the needle valve in the gas distribution control unit are connected, and the needle valve in each gas distribution control unit is connected to an intake passage. For example, the three control stop valves in the present application are respectively a first control stop valve, a second control stop valve and a third control stop valve, and the three needle valves in the present application are respectively a first needle valve, a second needle valve and a third needle valve. The intake system in the present application includes a first intake passage, a second intake passage and a third intake passage. The first control stop valve, the first needle valve and the first intake passage are arranged in sequence, the second control stop valve, the second needle valve and the second intake passage are arranged in sequence, and the third control stop valve, the third needle valve and the third intake passage are arranged in sequence.

[0014] In the specific embodiments of the present application, an air path cleaning assembly is further connected to the connecting pipeline. That is, one path of the connecting pipeline is connected to the third stop valve, one path is connected to the gas distribution control assembly, one path is connected to the pressure transmitter, and one path is connected to the air path cleaning assembly.

[0015] In the specific embodiments of the present application, the air path cleaning assembly includes an air path cleaning pipeline, and a fourth stop valve and a vacuum pump connected in sequence are arranged on the air path cleaning pipeline along the direction away from the connecting pipeline. Among them, the fourth stop valve is used to control the switch of the air path cleaning assembly. Before gas distribution, the fourth stop valve and the vacuum pump are opened, and the system is evacuated to 10 -1 -10 -6 mbar to remove impurities in the portable cylinder and pipeline, avoid the interference of impurities to the gas, and at the same time detect the airtightness of the detection device under low pressure or high pressure. During gas distribution, the fourth stop valve and the vacuum pump are closed. When the gas in the gas distribution control assembly needs to be emptied after gas distribution, the fourth stop valve and the vacuum pump are opened again, and the vacuum pump works to pump away the residual gas in the connecting pipeline.

[0016] In a specific embodiment of the present application, a fixing bracket is provided on one side of the portable cylinder near the first cut-off valve. The fixing bracket is sleeved on the portable cylinder and has an upper opening, and an output pressure reducing valve is clamped to the opening. The fixing bracket is used to fix the output pressure reducing valve, the output pressure monitor, and the cylinder pressure monitor. The output pressure reducing valve is used to control the output pressure of the mixed gas. On the opposite side walls of the output pressure reducing valve, there are respectively provided ferrule connectors. One of the ferrule connectors is connected to an output pipeline, and the output pipeline is communicated with the portable cylinder, so that the output pressure reducing valve can be communicated with the portable cylinder through the ferrule connector and the output pipeline. The other ferrule connector can be externally connected to a pipeline for the output use of the gas in the cylinder. For example, it can be connected to a 1 / 4 stainless steel pipeline for outputting the mixed gas. Both ferrule connectors are 1 / 4 ferrule connectors. On the side wall of the output pressure reducing valve where the ferrule connector connected to the output pipeline is close to the first cut-off valve, there is a cylinder pressure monitor for displaying the pressure of the mixed gas in the portable cylinder. The required output pressure can be selected according to the pressure of the mixed gas in the portable cylinder. On the side wall of the output pressure reducing valve away from the ferrule connector connected to the output pipeline, there is an output pressure monitor for reading the pressure of the output mixed gas. The change in the output pressure of the mixed gas after adjusting the output pressure reducing valve can be displayed by the output pressure monitor. That is, the output pressure monitor and the cylinder pressure monitor can be arranged on the third side surface other than the two sides with ferrule connectors. When the mixed gas is output, adjust the output pressure reducing valve and observe the reading of the output pressure monitor. When the output pressure monitor shows that the output pressure is the required output pressure, the mixed gas can be output according to the required output pressure.

[0017] In a specific embodiment of the present application, the small gas distribution device further includes a panel. The panel is located at the bottom of the connection assembly, the gas path cleaning assembly, the pressure transmitter, and the gas distribution control assembly, and is used to fix the connection assembly, the gas path cleaning assembly, the pressure transmitter, and the gas distribution control assembly. The size of the panel can be conventional or adjusted according to the actual use situation. In the embodiment of the present application, the size of the panel is 280*300mm.

[0018] In a specific embodiment of the present application, the above-mentioned intake pressure reducing monitor, output pressure monitor, and cylinder pressure monitor can include a pressure gauge or a pressure sensor; when the intake pressure reducing monitor, output pressure monitor, and cylinder pressure monitor are pressure sensors, the pressure sensors can be connected to a display terminal for visual reading. The display terminal can be a display, a controller with a display panel, a mobile phone, etc. The measuring range of the output pressure monitor can be 60 bar, and the measuring ranges of the intake pressure reducing monitor and the cylinder pressure monitor can reach 100 bar.

[0019] In a specific embodiment of the present application, the pressure transmitter is a sensor, and the pressure transmitter is externally connected to a display terminal for visual reading. The display terminal can be a display, a controller with a display panel, a mobile phone, etc. The measuring range of the pressure transmitter can reach 60 bar, accurate to 0.01 bar.

[0020] The display terminal includes a display screen, and a controller is provided in the display terminal. The controller is used to receive the signal of the pressure sensor and feedback the reading on the display screen. The controller is a commonly used controller. Those skilled in the art are aware that the processes of calculation, comparison, judgment, and output of instructions of the controller can all be implemented by using integrated circuit modules, programmable logic devices, other hardware, or by installing corresponding software modules in the prior art. Specifically, the controller is, for example, an ARM (Advanced RISC Machines) controller, an FPGA (Field Programmable Gate Array) controller, a SoC (System on Chip) controller, a DSP (Digital Signal Processing) controller, or an MCU (Microcontroller Unit) controller, etc. The controller is externally connected to a power supply.

[0021] In a specific embodiment of the present application, the connecting pipeline, the pipeline between each intake shut-off valve and the connecting pipeline, and the pipeline between the needle valve and the intake pressure reducing monitor all use 1 / 16 stainless steel pipes, with a small dead volume.

[0022] When the small gas distribution device of the present application is in use, it has the following steps:

[0023] S1) Before gas distribution, connect the portable cylinder to the connection component through a VCR joint to form a passage. The connection component is connected to the gas distribution control component. Close the first shut-off valve and the output pressure reducing valve, and open the second shut-off valve at its bottom; close the gas cylinder connected to the intake passage, open the third shut-off valve, all needle valves, all control shut-off valves, and all intake shut-off valves on the intake passage. Turn on the vacuum pump switch, and the vacuum pump starts to work. Open the fourth shut-off valve, and evacuate the entire device system to 10 -1 -10 -6 mbar. After the evacuation is completed, turn off the vacuum pump and the fourth shut-off valve. Close all needle valves and control shut-off valves.

[0024] S2) Gas mixing stage: Connect the gas cylinders to be mixed to each intake passage in the intake system, and clarify the pressure ratio of the gases entering each intake passage. At this time, all needle valves and all control stop valves are in the closed state, and all intake stop valves are in the open state; Open the gas cylinders to allow the gases to enter each intake passage, and adjust the cylinder pressure reducing valves on the gas cylinders so that the values of the intake pressure monitors for each intake passage are respectively consistent with or slightly higher than the required pressure to be filled. Fill the gases in the order of increasing pressure. When filling the gas into the first intake passage, open the first control stop valve, control the gas flow rate by adjusting the first needle valve, observe the reading of the pressure transmitter. After reaching the required pressure, first close the first needle valve. After the reading of the pressure transmitter stabilizes at the required pressure, close the first control stop valve, stop the gas input to this intake passage, and so on to complete the gas filling of each intake passage in the intake system.

[0025] S3) After the gas distribution is completed, at this time all needle valves and all control stop valves are in the closed state. Close the second stop valve, turn on the vacuum pump switch, and the vacuum pump starts to work. Open the fourth stop valve to evacuate the residual gas in the device. After evacuating the residual gas, turn off the vacuum pump and the fourth stop valve. Remove the portable gas cylinder and add a plug at the interface between the portable gas cylinder and the VCR joint for easy carrying, transfer, and high safety.

[0026] S4) When using the mixed gas, connect the 1 / 4 stainless steel pipeline to the ferrule. The 1 / 4 stainless steel pipeline is used to output the mixed gas, and adjust the output pressure reducing valve until the reading of the output pressure monitor is the required output pressure.

[0027] The beneficial effects of the present utility model are as follows: 1. The device is small and compact, easy to operate, time-consuming short, with a small dead volume, and gas saving; 2. It can configure two or more kinds of mixed gases; 3. It can accurately regulate the pressure ratio of each component gas; 4. The portable gas cylinder is small in size, easy to transfer and carry; after filling with the mixed gas, there is a pressure reducing valve and a stop valve at the upper end of the gas cylinder, and a stop valve and a plug at the lower end for sealing, with high safety performance; when in use, the output pressure of the mixed gas can be controlled by a secondary pressure reducing valve. Description of the Drawings

[0028] Figure 1 It shows a top view of the small gas distribution device of the present application.

[0029] Figure 2 It shows a side view of the small gas distribution device of the present application.

[0030] Reference Signs

[0031] 1 - Intake system; 2 - Gas distribution control component; 3 - Pressure transmitter; 4 - Connection component; 5 - Gas path cleaning component; 6 - Gas distribution cylinder component;

[0032] 11 - First one - way valve; 12 - Second one - way valve; 13 - Third one - way valve; 14 - First intake shut - off valve; 15 - Second intake shut - off valve; 16 - Third intake shut - off valve; 17 - First intake pressure - reducing monitor; 18 - Second intake pressure - reducing monitor; 19 - Third intake pressure - reducing monitor;

[0033] 21 - First needle valve; 22 - Second needle valve; 23 - Third needle valve; 24 - First control shut - off valve; 25 - Second control shut - off valve; 26 - Third control shut - off valve; 27 - Panel;

[0034] 41 - Connecting pipeline; 42 - Third shut - off valve;

[0035] 51 - Fourth shut - off valve; 52 - Vacuum pump;

[0036] 61 - VCR joint; 62 - Second shut - off valve; 63 - Portable cylinder; 64 - Handle; 65 - Ferrule; 66 - Output pressure - reducing valve; 67 - Cylinder pressure monitor; 68 - First shut - off valve; 69 - Output pipeline; 610 - Output pressure monitor; 611 - Fixing bracket. Detailed implementation mode

[0037] In the description of the present utility model, it should be noted that the structures, ratios, sizes, etc. shown in the drawings of this specification are only used to cooperate with the content disclosed in the specification for those who are familiar with this technology to understand and read, and are not used to limit the limiting conditions under which the present utility model can be implemented. Therefore, they do not have technical essential significance. Any modification of the structure, change of the proportional relationship or adjustment of the size, without affecting the effects that the present utility model can produce and the purposes that can be achieved, should still fall within the scope covered by the technical content disclosed in the present utility model. At the same time, the terms "center", "longitudinal", "lateral", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present utility model 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 therefore cannot be understood as a limitation to the present utility model. In addition, the terms "first" and "second" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance.

[0038] In the description of the present utility model, it should be noted that unless otherwise clearly specified and defined, the terms "installation", "connection", "linkage", and "communication" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, and it can be the internal communication of two components. For those of ordinary skill in the art, the specific meanings of the above terms in the present utility model can be understood according to specific circumstances.

[0039] Embodiment 1 Small Gas Distribution Device and Its Use

[0040] As Figure 1 and Figure 2 shown, the small gas distribution device includes a gas distribution cylinder assembly 6, a connection assembly 4, a gas distribution control assembly 2, and an intake system 1 that are connected in sequence.

[0041] The gas distribution cylinder assembly 6 includes a portable cylinder 63 and a VCR joint 61. The portable cylinder 63 is detachably communicated with the connection assembly 4 through the VCR joint 61.

[0042] The gas distribution cylinder assembly 6 further includes a first stop valve 68 and a second stop valve 62. The first stop valve 68 is provided at one end of the portable cylinder 63 away from the VCR joint 61, and the second stop valve 62 is provided at one end of the portable cylinder 63 close to the VCR joint 61 and is detachably connected to the VCR joint 61.

[0043] The volume of the portable cylinder 63 is 0.5 L, and the nominal working pressure is 10 MPa; a handle 64 is provided on the side wall of the portable cylinder 63.

[0044] The connection assembly 4 includes a connection pipeline 41. A third stop valve 42 is provided at one end of the connection pipeline 41 close to the VCR joint 61, and the third stop valve 42 is detachably connected to the VCR joint 61 of the gas distribution cylinder assembly 6. The end of the connection pipeline 41 away from the VCR joint 61 is communicated with the gas distribution control assembly 2.

[0045] The connection pipeline 41 is a four-way pipeline. The connection pipeline 41 uses a 1 / 16 stainless steel pipe, and the pipeline volume is less than 1.5 cm 3 .

[0046] A pressure transmitter 3 is connected to the connection component 4. The pressure transmitter 3 is connected to one passage of the connection pipeline 41. The pressure transmitter 3 is externally connected to a display terminal. The display terminal includes a display, and a controller is provided in the display terminal. The controller receives the signal of the pressure sensor and feeds back the reading on the display screen, so that the reading can be obtained through the display. The display terminal can be a computer for reading, for example. The measuring range of the pressure transmitter 3 can reach 60 bar, accurate to 0.01 bar.

[0047] The gas distribution control component 2 includes 3 gas distribution control units. Each gas distribution control unit includes 1 control stop valve and 1 needle valve. The control stop valve and the needle valve are connected. The control stop valve is connected to the connection pipeline 41 of the connection component 4 through a pipeline. The needle valve is connected to the corresponding intake passage of an intake system 1; the 3 control stop valves are respectively the first control stop valve 24, the second control stop valve 25, and the third control stop valve 26; the 3 needle valves are respectively the first needle valve 21, the second needle valve 22, and the third needle valve 23. The first control stop valve 24 is connected to the first needle valve 21, the second control stop valve 25 is connected to the second needle valve 22, and the third control stop valve 26 is connected to the third needle valve 23.

[0048] The pipeline in the gas distribution control component 2 uses 1 / 16 stainless steel pipe with a small dead volume.

[0049] The gas distribution control component 2 further includes a panel 27; the panel 27 is used to fixedly connect the connection component 4, the gas path cleaning component 5, the pressure transmitter 3, and the gas distribution control component 2. The size of the panel 27 is 280*300 mm.

[0050] The intake system 1 includes 3 intake passages, namely the first intake passage, the second intake passage, and the third intake passage. Along the direction away from the gas distribution control component 2, each of the intake passages is successively provided with an intake pressure reducing monitor, an intake stop valve, and a one-way valve connected to each other. One end of each intake passage away from the gas distribution control component 2 is connected to an externally connected gas cylinder.

[0051] Specifically, the first intake passage includes a first intake pressure reducing monitor 17, a first intake stop valve 14, and a first one-way valve 11 connected to each other in sequence along the direction away from the gas distribution control component 2. And the first intake passage is connected to the first needle valve 21.

[0052] Specifically, the second intake passage includes a second intake pressure reducing monitor 18, a second intake stop valve 15, and a second one-way valve 12 connected to each other in sequence along the direction away from the gas distribution control component 2. And the second intake passage is connected to the second needle valve 22.

[0053] Specifically, the third intake passage includes a third intake pressure reducing monitor 19, a third intake shut-off valve 16, and a third one-way valve 13 that are connected in sequence along a direction away from the gas distribution control assembly 2. And the third intake passage is connected to the third needle valve 23.

[0054] An air path cleaning assembly 5 is also connected to the connecting pipeline 41. The air path cleaning assembly 5 includes a fourth shut-off valve 51 and a vacuum pump 52 that are connected along a direction away from the connecting pipeline 41.

[0055] On one side of the portable cylinder 63 close to the first shut-off valve 68, there is a fixing bracket 611. The fixing bracket 611 is sleeved on the portable cylinder 63 and has an open upper end. An output pressure reducing valve 66 is clamped at the opening. On the opposite side walls of the output pressure reducing valve, there are respectively provided ferrule 65. One of the ferrules 65 is connected to an output pipeline 69, and the output pipeline 69 communicates with the portable cylinder 63; the other ferrule 65 is used for external pipeline to output gas; the ferrules 65 are all 1 / 4 ferrules.

[0056] On the side wall of the output pressure reducing valve 66 where the ferrule 65 connected to the output pipeline 69 is close to the first shut-off valve 68, there is a cylinder pressure monitor 67 for reading and observing the gas pressure in the portable cylinder 63. On the side wall of the output pressure reducing valve 66 on the side away from the ferrule 65 connected to the output pipeline 69, there is an output pressure monitor 610 for reading the pressure of the output mixed gas.

[0057] The intake pressure reducing monitor, the output pressure monitor 610, and the cylinder pressure monitor 67 are pressure gauges or pressure sensors. When they are pressure gauges, the readings can be directly taken on the pressure gauges. When they are pressure sensors, the pressure sensors are externally connected to a display terminal. The display terminal includes a display, and there is a controller in the display terminal. The controller receives the signals from the pressure sensors and feeds back the readings on the display screen, so that the readings can be taken through the display. The display terminal can be a computer, for example.

[0058] When the small gas distribution device is in use, only two intake passages in the intake system 1 can be used, for example, the first intake passage and the second intake passage, to mix two gases. The usage method is as follows:

[0059] Before gas distribution: connect the portable steel cylinder 63 to the connecting assembly 4 through the VCR connector 61 to form a passage, close the first stop valve 68 and the output pressure reducing valve 66, and open the second stop valve 62 at its bottom; close the third needle valve 23 and the third control stop valve 26 that are not in use. Connect the gas cylinder to be mixed to the first intake passage and the second intake passage of the intake system 1, and close the gas cylinder connected to the intake passage, open the third stop valve 42, the first needle valve 21, the second needle valve 22, the first control stop valve 24, the second control stop valve 25, the first intake stop valve 14, and the second intake stop valve 15, turn on the vacuum pump 52 switch, the vacuum pump 52 starts working, open the fourth stop valve 51, and evacuate the entire gas distribution system to 10 -1 -10 -6 After the vacuuming is completed, the vacuum pump 52 and the fourth stop valve 51 are closed.

[0060] Preset the pressure distribution of each mixed gas: open the gas cylinder, clarify the pressure ratio of the gas entering each intake passage in the intake system 1, and each gas is charged through the first intake passage and the second intake passage of the intake system 1. Specifically, close the first needle valve 21 and the first control stop valve 24, the first intake stop valve 14 is in the open state, open the gas cylinder connected to the first intake passage, adjust the gas cylinder pressure reducing valve on the gas cylinder, observe the intake pressure on the first intake passage through the first intake pressure reducing monitor 17, and adjust the intake pressure to be slightly greater than the required pressure to be charged. Close the second needle valve 22 and the second control stop valve 25, the second intake stop valve 15 is in the open state, open the gas cylinder connected to the second intake passage, adjust the gas cylinder pressure reducing valve on the gas cylinder, observe the intake pressure on the second intake passage through the second intake pressure reducing monitor 18, and adjust the intake pressure to be slightly greater than the required pressure to be charged.

[0061] During gas distribution: open the second stop valve 62. When the first air intake passage of the air intake system 1 is filled with gas, open the first control stop valve 24 and the first needle valve 21. Control the gas flow rate by adjusting the first needle valve 21. Observe the indication of the pressure transmitter 3. When the required pressure is reached, close the first needle valve 21 first. After the indication of the pressure transmitter 3 stabilizes at the required pressure, close the first control stop valve 24 to stop the gas input to the first air intake passage.

[0062] When the second air intake passage of the air intake system 1 is filled with gas, open the second control stop valve 25 and the second needle valve 22, control the gas flow rate by adjusting the second needle valve 22, observe the indication of the pressure transmitter 3, and close the second needle valve 22 after the required pressure is reached. After the indication of the pressure transmitter 3 stabilizes at the required pressure, close the second control stop valve 25 to stop the gas input to the second air intake passage.

[0063] After the gas distribution is completed, close the second stop valve 62. At this time, all the needle valves and control stop valves are in the closed state. Turn on the switch of the vacuum pump 52, and the vacuum pump 52 starts to work. Open the fourth stop valve 51 to evacuate the residual gas in the device. After evacuating the residual gas, close the vacuum pump 52 and the fourth stop valve 51. Remove the portable cylinder 63 and add a plug at the interface between the portable cylinder 63 and the VCR joint 61 for easy carrying and transfer.

[0064] When using the mixed gas, connect the 1 / 4 stainless steel pipeline to the ferrule 65, connect the 1 / 4 stainless steel pipeline to the device using the mixed gas, and adjust the output pressure reducing valve 66 until the reading of the output pressure monitor 610 reaches the required output pressure.

[0065] When the small gas distribution device is in use, all the intake passages in the intake system 1 can be used to achieve the mixing of three gases. The usage method is as follows:

[0066] Before gas distribution: Connect the portable cylinder 63 to the connection assembly 4 through the VCR joint 61 to form a passage. Close the first stop valve 68 and the output pressure reducing valve 66, and open the second stop valve 62 at its bottom; Connect the gas cylinders to be mixed to the three intake passages of the intake system 1, close the gas cylinders connected to the intake passages, and open the third stop valve 42, the first needle valve 21, the second needle valve 22, the third needle valve 23, the first control stop valve 24, the second control stop valve 25, the third control stop valve 26, the first intake stop valve 14, the second intake stop valve 15, and the third intake stop valve 16. Turn on the switch of the vacuum pump 52, and the vacuum pump 52 starts to work. Open the fourth stop valve 51 to evacuate the entire gas distribution device system to 10 -1 -10 -6 mbar. After the evacuation is completed, close the vacuum pump 52 and the fourth stop valve 51.

[0067] Preset the pressure distribution of each mixed gas: Open the gas cylinder, clarify the pressure ratio of the gases entering each intake passage in the intake system 1, and each gas is filled through the first intake passage, the second intake passage, and the third intake passage of the intake system 1. Specifically, close the first needle valve 21 and the first control stop valve 24, the first intake stop valve 14 is in the open state, open the gas cylinder connected to the first intake passage, adjust the pressure reducing valve on the gas cylinder, observe the intake pressure on the first intake passage through the first intake pressure reducing monitor 17, and adjust the intake pressure to be slightly greater than the required pressure to be filled, and so on to adjust the second intake pressure reducing monitor 18 of the second intake passage and the third intake pressure reducing monitor 19 of the third intake passage to be slightly greater than the required pressure to be filled.

[0068] During gas distribution: Open the second shut-off valve 62. When the first intake passage of the intake system 1 is filled with gas, open the first control shut-off valve 24 and the first needle valve 21. Control the gas flow rate by adjusting the first needle valve 21, and observe the reading of the pressure transmitter 3. After reaching the required pressure, first close the first needle valve 21. After the reading of the pressure transmitter 3 stabilizes at the required pressure, close the first control shut-off valve 24 to stop the gas input to the first intake passage.

[0069] When the second intake passage of the intake system 1 is filled with gas, open the second control shut-off valve 25 and the second needle valve 22. Control the gas flow rate by adjusting the second needle valve 22, and observe the reading of the pressure transmitter 3. After reaching the required pressure, first close the second needle valve 22. After the reading of the pressure transmitter 3 stabilizes at the required pressure, close the second control shut-off valve 25 to stop the gas input to the second intake passage.

[0070] When the third intake passage of the intake system 1 is filled with gas, open the third control shut-off valve 26 and the third needle valve 23. Control the gas flow rate by adjusting the third needle valve 23, and observe the reading of the pressure transmitter 3. After reaching the required pressure, first close the third needle valve 23. After the reading of the pressure transmitter 3 stabilizes at the required pressure, close the third control shut-off valve 26 to stop the gas input to the third intake passage.

[0071] After gas distribution is completed, close the second shut-off valve 62. At this time, all the needle valves and control shut-off valves are in the closed state. Turn on the switch of the vacuum pump 52, and the vacuum pump 52 starts to work. Open the fourth shut-off valve 51 to evacuate the residual gas in the device. After evacuating the residual gas, close the vacuum pump 52 and the fourth shut-off valve 51. Remove the portable cylinder 63, and add a plug at the interface between the portable cylinder 63 and the VCR joint 61 for easy carrying and transfer.

[0072] When using the mixed gas, connect the 1 / 4 stainless steel pipeline to the ferrule 65, connect the 1 / 4 stainless steel pipeline to the device using the mixed gas, and adjust the output pressure reducing valve 66 until the reading of the output pressure monitor 610 reaches the required output pressure.

[0073] The above embodiments are only illustrative of the principles and effects of the present invention, and are not intended to limit the present invention. Any person familiar with this technology can modify or change the above embodiments without departing from the spirit and scope of the present invention. Therefore, all equivalent modifications or changes made by those with ordinary knowledge in the technical field without departing from the spirit and technical ideas disclosed by the present invention should still be covered by the claims of the present invention.

Claims

1. A small gas distribution device, characterized in that: The invention comprises a gas distribution cylinder assembly (6), a connection assembly (4), a gas distribution control assembly (2) and an air intake system (1) which are connected in sequence; the air intake system (1) comprises a plurality of air intake passages; the gas distribution cylinder assembly (6) comprises a portable cylinder (63) and a VCR connector (61), and the portable cylinder (63) is detachably connected to the connection assembly (4) via the VCR connector (61); the gas distribution control assembly (2) comprises a plurality of gas distribution control units, and the gas distribution control units comprise a connected control stop valve and a needle valve, the control stop valve is connected to the connection assembly (4), and the needle valve is connected to the corresponding air intake passage in the air intake system (1); the connection assembly (4) is connected to a pressure transmitter (3).

2. The small gas distribution device according to claim 1, characterized in that: Each of the air intake passages is provided with an air intake pressure reduction monitor, an air intake stop valve and a one-way valve in sequence in a direction away from the air distribution control component (2); one end of each of the air intake passages away from the air distribution control component (2) is connected to an external gas cylinder.

3. The small gas distribution device according to claim 1, characterized in that: The number of the control cut-off valves, needle valves and intake passages is equal.

4. The small gas distribution device according to claim 3, characterized in that: The number of the control stop valve, the needle valve and the air intake passage is two or more.

5. The small gas distribution device according to claim 1, characterized in that: The gas distribution cylinder assembly (6) further comprises a first stop valve (68) and a second stop valve (62), wherein the first stop valve (68) is arranged at an end of the portable cylinder (63) away from the VCR connector (61), and the second stop valve (62) is arranged at an end of the portable cylinder (63) close to the VCR connector (61) and is detachably connected to the VCR connector (61).

6. The small gas distribution device according to claim 1, characterized in that: The connection assembly (4) comprises a connection pipeline (41), wherein a third stop valve (42) is provided at one end of the connection pipeline (41) close to the VCR joint (61), and the third stop valve (42) is detachably connected to the VCR joint (61), and an end of the connection pipeline (41) away from the VCR joint (61) is in communication with the gas distribution control assembly (2).

7. The small gas distribution device according to claim 6, characterized in that: The connecting pipeline (41) is a four-way pipeline, and the connecting pipeline (41) is also connected to the pressure transmitter (3).

8. The small gas distribution device according to claim 7, characterized in that: The connecting pipeline (41) is also connected to a gas path cleaning component (5).

9. The small gas distribution device according to claim 8, characterized in that: The gas path cleaning assembly (5) comprises a gas path cleaning pipeline, and the gas path cleaning pipeline is provided with a fourth stop valve (51) and a vacuum pump (52) connected in sequence along a direction away from the connecting pipeline (41).

10. The small gas distribution device according to claim 5, characterized in that: A fixing frame (611) is provided on a side of the portable steel cylinder (63) close to the first stop valve (68), the fixing frame (611) is sleeved on the portable steel cylinder (63) and has an upper end opening, the opening being clamped with an output pressure reducing valve (66); sleeves (65) are provided on opposite side walls of the output pressure reducing valve (66), one of the sleeves (65) is connected to an output pipeline (69), and the output pipeline (69) is in communication with the portable steel cylinder (63); the other sleeve (65) is used to output gas through an external pipeline; a steel cylinder pressure monitor (67) is provided on a side wall of the output pressure reducing valve (66) on a side of the sleeve (65) connected to the output pipeline (69) close to the first stop valve (68), and an output pressure monitor (610) is provided on a side wall of the output pressure reducing valve (66) on a side of the sleeve (65) far from the output pipeline (69); and / or, a handle (64) is provided on the side wall of the portable steel cylinder (63); And / or, the gas distribution control assembly (2) further includes a panel (27).

11. The small gas distribution device according to any one of claims 1 to 10, characterized in that: The pressure transmitter (3) is externally connected to a display terminal; the intake pressure reduction monitor, the output pressure monitor (610), and the cylinder pressure monitor (67) are pressure gauges or pressure sensors. When the intake pressure reduction monitor, the output pressure monitor (610), and the cylinder pressure monitor (67) are pressure sensors, the pressure sensors are externally connected to a display terminal; The display terminal includes a display screen, and a controller is disposed inside the display terminal. The controller is used to receive a signal from a pressure sensor and feed back a reading on the display screen.

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