Multi-channel gas distribution instrument

Abstract

The utility model relates to the technical field of gas distribution instruments, in particular to a multi-channel gas distribution instrument which is internally provided with at least one balance gas channel and at least one standard gas channel, various gases are conveyed to a gas mixing tank to be mixed, and each gas channel is provided with a mass flow controller. Corresponding gas distribution parameters can be input through the touch control display screen according to gas distribution requirements, standard gas flow and balance gas flow are calculated through the main control board, gas distribution concentration control and real-time gas distribution monitoring are achieved through the mass flow controller, alarm information can be displayed on the touch control display screen if gas distribution is abnormal, meanwhile, a lithium battery is further arranged in the gas distribution instrument, and the safety of the gas distribution instrument is improved. And the gas distributor can work in an environment without a power supply. According to the gas distribution instrument provided by the utility model, the output concentration of each gas does not need to be calculated manually, the gas distribution instrument is in a monitoring state in the whole process after the gas distribution is started, the gas distribution accuracy and no abnormity are ensured, and the gas distribution instrument is a lithium battery which can ensure that the gas distribution instrument can work normally in an environment without a power supply.

Description

Technical Field

[0001] The utility model relates to the technical field of gas distribution instruments, and particularly provides a multi-channel gas distribution instrument. Background Technique

[0002] As an important device, the gas distribution instrument has important applications in industrial production, experimental research, environmental protection monitoring, medical and health, and energy industries. Most of the existing gas distribution instruments on the market adopt open-loop control. Before working, the output port after connecting the standard gas cylinder and the pressure reducing valve needs to be connected to the gas distribution instrument, and the output end of the gas distribution instrument is connected to the gas-using end to complete the connection of the gas distribution gas path. According to the concentration of the standard gas, the flow value that each gas path should output is calculated manually and set on the gas distribution instrument, and the gas distribution instrument outputs the gas flow corresponding to the concentration. This device requires manual participation in calculating the gas distribution concentration, has a low degree of automation, inconvenient operation, and low efficiency.

[0003] After the existing gas distribution instrument sets the output concentration and starts gas distribution, it is in a non-monitoring state. When situations such as concentration drift and flow distortion occur, it cannot be detected in time, and thus the gas distribution accuracy cannot be ensured to be continuously stable and reliable. In addition, the existing gas distribution instrument has a poor gas mixing effect, resulting in insufficient and uneven mixing of the prepared mixed gas, which affects the use. Moreover, the existing gas distribution instrument needs to be powered by an external AC220V power supply and can only be used in places with a power supply, and cannot adapt to places such as the wild. Content of the Utility Model

[0004] In order to solve the above problems, the utility model provides a multi-channel gas distribution instrument. The gas distribution instrument is provided with multiple air channels, and each air channel is provided with a mass flow controller. The multiple air channels are connected to a mixing tank, and the gas is fully mixed through the mixing tank. The gas distribution parameters are input and the real-time gas distribution supervision is realized through a touch display screen. At the same time, a lithium battery is also arranged in the gas distribution instrument to ensure that the gas distribution instrument can work normally in an environment without power supply.

[0005] The multi-channel gas distribution instrument provided by the utility model includes:

[0006] At least one standard gas channel and at least one balance gas channel;

[0007] The two ends of the standard gas channel are respectively connected to a standard gas source and a mixing tank, and the two ends of the balance gas channel are respectively connected to a balance gas source and a mixing tank; the mixing tank includes an input end, a dynamic mixing layer, a deceleration layer, a dynamic output layer and an output end, and the input end, the dynamic mixing layer, the deceleration layer, the dynamic output layer and the output end are connected in sequence. A deceleration fan is arranged in the deceleration layer.

[0008] Electromagnetic switching valves and mass flow controllers are arranged on both the standard gas channel and the balance gas channel. The electromagnetic switching valves can control the on-off of the air channels, and the mass flow controllers can measure and feedback the gas flow in the air channels;

[0009] Preferably, the touch display screen is arranged on the outer surface of the multi-channel gas distributor, and gas distribution parameters can be input through the touch display screen.

[0010] Preferably, the touch display screen is inclined towards the inside of the multi-channel gas distributor.

[0011] Preferably, the touch display screen can display the real-time gas flow rates of the standard gas channel and the balance gas channel.

[0012] Preferably, it further includes a main control board, which can calculate the gas flow rates in the standard gas channel and the balance gas channel according to the gas distribution parameters.

[0013] Preferably, the balance gas is nitrogen.

[0014] Preferably, the input end of the gas mixing tank is of a Laval nozzle structure.

[0015] Preferably, the output end of the gas mixing tank is connected to the gas using end.

[0016] Preferably, the rotation direction of the deceleration fan is opposite to the rotation direction of the air flow in the deceleration layer.

[0017] Preferably, it further includes a lithium battery

[0018] Compared with the prior art, the present utility model can achieve the following beneficial effects:

[0019] The gas distributor provided by the present utility model is provided with multiple standard gas channels and at least one balance gas channel inside, and can realize the gas distribution work of two or more standard gases; a main control board is arranged inside the gas distributor, and the main control board calculates the gas flow rates of each gas channel according to the gas distribution parameters input by the touch display screen. It is not necessary to manually calculate the gas flow rates of each gas before gas distribution, reducing the manual requirement and improving the gas distribution efficiency; mass flow controllers are also arranged on each gas channel, and the gas distribution state can be monitored in real time after the gas distribution starts. When abnormal gas output occurs, it can be detected in time and an alarm can be given. The main control board can also automatically calibrate the gas distribution concentration according to the monitoring results of the mass flow controllers to ensure accurate gas distribution; a gas mixing tank is arranged inside the gas distributor, and the gas mixing tank has a three-layer structure inside. The gases collide and mix evenly at high speed in the upper layer, and after decelerating through the middle layer, they are stably output from the lower layer to ensure the uniformity of the prepared mixed gas; a lithium battery is also arranged inside the gas distributor to supply power to the entire gas distributor, ensuring that the gas distributor can still work normally in an environment without power supply. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 is a schematic structural diagram of the gas distributor provided by the embodiment of the present utility model;

[0021] Figure 2 is a schematic diagram of the air passage provided by the embodiment of the present utility model;

[0022] Figure 3 It is a schematic diagram of the working process of the gas distribution instrument provided according to an embodiment of the present utility model;

[0023] Figure 4 It is a schematic diagram of the gas flow calibration process provided according to an embodiment of the present utility model;

[0024] Figure 5 It is a schematic diagram of the structure of the gas mixing tank provided according to an embodiment of the present utility model;

[0025] Figure 6 It is a schematic diagram of the internal structure of the gas mixing tank provided according to an embodiment of the present utility model;

[0026] Figure 7 It is a schematic diagram of the dynamic gas mixing layer structure of the gas mixing tank provided according to an embodiment of the present utility model.

[0027] The attached drawing reference numerals therein include:

[0028] Touch screen display 1, gas mixing tank 2, input end 21, Laval nozzle 211, dynamic gas mixing layer 22, deceleration layer 23, deceleration fan 231, dynamic output layer 24, output end 25, lithium battery 3, electromagnetic switch valve 4, main control board 5, check valve 6, pressure stabilizing valve 7, mass flow controller 8. Detailed implementation manners

[0029] In the following, embodiments of the present utility model will be described with reference to the attached drawings. In the following description, the same modules are denoted by the same reference numerals. In the case of the same reference numerals, their names and functions are also the same. Therefore, their detailed descriptions will not be repeated.

[0030] In order to make the objectives, technical solutions and advantages of the present utility model clearer and more understandable, the present utility model will be further described in detail below with reference to the attached drawings and specific embodiments. It should be understood that the specific embodiments described herein are only used to explain the present utility model and do not constitute a limitation to the present utility model.

[0031] As Figure 1 shown, the present utility model provides a multi-channel gas distribution instrument. A touch screen display 1 is provided on the gas distribution instrument to facilitate human-machine interaction. The touch screen display 1 is arranged on the outer surface of the gas distribution instrument and is inclined towards the inside of the gas distribution instrument at a certain angle, facilitating the user to operate on the touch screen display 1. The touch screen display 1 is connected to the main control board 5. The information input by the user on the touch screen display 1 is calculated and processed by the main control board 5, and the processing result is displayed on the touch screen display 1 for the user to view.

[0032] As Figure 2As shown in the figure, there is at least one standard gas channel and at least one balance gas channel arranged inside the gas distribution instrument. One end of the standard gas channel is connected to the standard gas source, and the other end is connected to the mixing tank 2. The standard gas channel is used to transport various standard gases into the mixing tank 2. Each standard gas channel transports a specific concentration of standard gas. The number of types of the mixed standard gases determines the number of standard gas channels. Multiple standard gas channels can achieve the mixing of various standard gases. One end of the balance gas channel is connected to the balance gas source, and the other end is connected to the mixing tank 2. The balance gas channel is used to transport the balance gas into the mixing tank 2. When mixing gases, usually one type of gas is used as the balance gas. If the number of types of the balance gas increases, the number of balance gas channels can be increased accordingly. In the embodiment of the present utility model, the balance gas is nitrogen, there are two standard gas channels, and one balance gas channel.

[0033] As Figure 2 , Figure 3 and Figure 4 As shown in the figure, before starting gas distribution, after connecting each air channel, the user inputs gas distribution parameters through the touch display screen 1. The gas distribution parameters include the concentration of each standard gas and balance gas, the concentration and flow rate of the mixed gas obtained by gas distribution. The main control board 5 calculates the output flow rate of each standard gas and the output flow rate of the balance gas according to the parameters input by the touch display screen 1, and the calculated flow rate of each standard gas and balance gas is displayed on the touch display screen 1.

[0034] Electromagnetic solenoid valves 4, check valves 6, pressure stabilizing valves 7, and mass flow controllers 8 are provided on all calibration gas channels and balance gas channels. After calculating the flow rates of each calibration gas and balance gas, the main control board 5 controls the electromagnetic solenoid valves 4 in each air passage to open. The calibration gas and balance gas flow out from the calibration gas source and balance gas source respectively, and flow into the mixing tank 2 through the corresponding air passages. When the calibration gas and balance gas flow through the corresponding air passages, they sequentially pass through the check valve 6, pressure stabilizing valve 7, and mass flow controller 8 provided in the air passage. The check valve 6 can ensure that there is no backflow of the gas flow. And when the gas flow rate is small (the air passage cannot be filled), the check valve 6 can prevent the gas in the air passage from diffusing into other air passages, affecting the calibration gas source or balance gas source. The check valve 6 can ensure that the gas flow continuously outputs into the mixing tank 2. The pressure stabilizing valve 7 is used to ensure the pressure stability in the air passage, so that there will be no excessive pressure fluctuations in the air passage, thereby affecting the gas mixing stability or the gas mixing accuracy rate. The mass flow controller 8 can detect the gas flow rate flowing in the air passage where it is located in real time, and feedback the detection result to the main control board 5. The main control board 5 calculates the concentration of the mixed gas based on the flow rates of each air passage detected by the mass flow controller 8 of the air passage in real time, and calculates the difference between the calculated concentration value and the concentration of the standard mixed gas. If the difference exceeds the error upper limit, it indicates that the concentration of the mixed gas prepared at this time is inaccurate. The main control board 5 recalculates the flow rate data of each air passage, and feeds the recalculated flow rate data back to the mass flow controller 8 of the corresponding air passage. The mass flow controller 8 re-regulates the gas flow rate in the air passage where it is located, thereby realizing the automatic monitoring and calibration of gas mixing. The whole process of gas mixing is under monitoring to ensure the accuracy of the concentration of the prepared mixed gas.

[0035] In the actual application of the gas mixer, it may occur that only one calibration gas and one balance gas are mixed. At this time, the main control board 5 can judge which air passages are needed for gas mixing according to the set requirements, and only keep the required calibration gas channels and balance gas channels connected to the mixing tank 2, and close all other air passages. The usage of the air passages can be set according to the requirements. Before automatic calibration, the main control board 5 needs to first judge whether the gas mixing mode is a single-channel mode for mixing one calibration gas or a multi-channel mode for mixing multiple calibration gases, and calculate the concentration of the mixed gas according to the judgment result.

[0036] In the embodiment of the present utility model, the calibration gas and balance gas output from each air passage are fully mixed in the mixing tank 2, such as Figure 5 、 Figure 6 and Figure 7As shown in the figure, the gas mixing tank 2 includes an input end 21, a dynamic gas mixing layer 22 located in the upper layer, a deceleration layer 23 located in the middle layer, a dynamic output layer 24 located in the lower layer, and an output end 25. The input end 21, the dynamic gas mixing layer 22, the deceleration layer 23, the dynamic output layer 24, and the output end 25 are connected in sequence. The input end 21 of the gas mixing tank 2 is connected to the standard gas channel and the balance gas channel. The output end 25 of the gas mixing tank 2 is connected to the gas-using end. A plurality of input ends 21 are communicated with the dynamic gas mixing layer 22. The number of the input ends 21 is the same as the sum of the standard gas channel and the balance gas channel. The input ends 21 are evenly distributed on the outer surface of the gas mixing tank 2, presenting a "windmill" arrangement. The structure of the pipeline of the input end 21 is a Laval nozzle 211, and the axis of each Laval nozzle 211 does not intersect with the central axis of the gas mixing tank 2. The standard gas and the balance gas enter the dynamic gas mixing layer 22 of the gas mixing tank 2 through the Laval nozzle 211. The Laval nozzle 211 can accelerate the standard gas and the balance gas entering the dynamic gas mixing layer 22, so that the standard gas and the balance gas flow into the dynamic gas mixing layer 22 at a high speed and realize the convective collision type of gas mixing. The dynamic gas mixing layer 22 is communicated with the deceleration layer 23. The mixed gas enters the deceleration layer 23 for deceleration. A deceleration fan 231 is arranged in the deceleration layer 23. The rotation direction of the deceleration fan 231 is opposite to the rotation direction of the mixed gas flow, so as to realize the deceleration of the mixed gas flow. The deceleration layer 23 is communicated with the dynamic output layer 24. The decelerated mixed gas flows from the deceleration layer 23 into the dynamic output layer 24. The dynamic output layer 24 is communicated with the output end 25. The output end 25 is connected to the gas-using end. The mixed gas is output from the dynamic output layer 24 through the output end 25 to the gas-using end for use.

[0037] The existing gas distributor needs to be powered by an external AC220V power supply. If the gas distribution location is in the wild, the existing gas distributor cannot work properly. In the embodiment of the present invention, a lithium battery 3 is arranged in the gas distributor. Within a certain period of time, it can ensure that the gas distributor works without an external power supply, realizing the operation of the gas distributor in a power-free place such as the wild.

[0038] For the gas distributor provided by the embodiment of the present invention, it is not necessary to manually calculate the output concentration of each standard gas and balance gas before gas distribution. During gas distribution, the gas distributor can perform gas distribution monitoring by itself and perform gas distribution calibration according to the monitoring results to ensure the accuracy of the concentration of the prepared mixed gas. A lithium battery 3 is also arranged in the gas distributor, which can ensure that the gas distributor works in a power-free environment such as the wild.

[0039] Although the embodiments of the present invention have been shown and described above, it can be understood that the above embodiments are exemplary and should not be construed as limiting the present invention. Those of ordinary skill in the art can make changes, modifications, substitutions, and variations to the above embodiments within the scope of the present invention.

[0040] The above specific embodiments of the present utility model do not constitute a limitation to the protection scope of the present utility model. Any other corresponding changes and deformations made according to the technical concept of the present utility model shall be included within the protection scope of the claims of the present utility model.

Claims

1. A multi-channel gas distributor, characterized in that, Including: One or more calibration gas channels and at least one balance gas channel; Both ends of the calibration gas channel are respectively connected to a calibration gas source and a mixing tank, and both ends of the balance gas channel are respectively connected to a balance gas source and the mixing tank; the mixing tank includes an input end, a dynamic mixing layer, a deceleration layer, a dynamic output layer and an output end, the input end, the dynamic mixing layer, the deceleration layer, the dynamic output layer and the output end are sequentially communicated, and a deceleration fan is arranged in the deceleration layer; Electromagnetic solenoid valves and mass flow controllers are arranged on both the calibration gas channel and the balance gas channel. The electromagnetic solenoid valve can control the on / off of the air passage, and the mass flow controller can measure and feedback the gas flow in the air passage.

2. The multi-channel gas distributor according to claim 1, characterized in that, It further includes a touch display screen, which is arranged on the outer surface of the multi-channel gas distributor, and gas distribution parameters can be input through the touch display screen.

3. The multi-channel gas distributor according to claim 2, wherein, The touch display screen inclines towards the inside of the multi-channel gas distributor.

4. The multi-channel gas distributor according to claim 2, wherein, The touch display screen can display the real-time gas flow of the calibration gas channel and the balance gas channel.

5. The multi-channel gas distributor according to claim 1, characterized in that, The balance gas is nitrogen.

6. The multi-channel gas distributor according to claim 1, characterized in that The input end of the mixing tank is of a Laval nozzle structure.

7. The multi-channel gas distributor according to claim 1, wherein The output end of the mixing tank is connected to the gas-using end.

8. The multi-channel gas distributor according to claim 1, wherein, The rotation direction of the deceleration fan is opposite to the rotation direction of the air flow in the deceleration layer.

9. The multi-channel gas distributor according to claim 1, wherein It further includes a lithium battery.

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