Dynamic dilution instrument

Abstract

The utility model relates to the field of diluters, in particular to a dynamic diluter. Comprising a box body (1), a standard gas inlet (2), a diluent gas inlet (3), a bypass gas outlet (4) and a diluent gas outlet (5) are formed in a rear panel of the box body (1); the standard gas inlet (2) is connected with the input end of the first mass flow meter (6) through a pipeline, and the diluted gas inlet (3) is connected with the input end of the second mass flow meter (7) through a pipeline; the output ends of the first mass flow meter (6) and the second mass flow meter (7) are respectively connected with the bypass gas outlet (4) through a first clamping sleeve right-angle tee joint (8) and a pipeline; a second clamping sleeve right-angle tee joint (9) is arranged in the middle of a pipeline between the bypass gas outlet (4) and the first clamping sleeve right-angle tee joint (8), and the second clamping sleeve right-angle tee joint (9) is connected with the bypass gas outlet (4) through the pipeline; and gas distribution dilution of various gases can be realized, the precision is high, and the application range is wider.

Description

Technical Field

[0001] This utility model relates to the field of dilution instruments, specifically a dynamic dilution instrument. Background Technology

[0002] A dynamic dilution apparatus is a device used for gas dilution, for the online or laboratory preparation of standard gas mixtures. Its principle is to dynamically dilute high-concentration gas samples to the desired low-concentration gas by precisely controlling the gas flow rate.

[0003] Current dynamic dilution instruments lack automatic gas mixing capabilities and have a low level of intelligence; their maximum dilution ratio is also relatively small, with a narrow range. Therefore, this invention provides a dynamic dilution instrument with high precision, support for multiple gas types, automatic program control, and fast, efficient, and stable operation, which has significant practical implications. Utility Model Content

[0004] To solve the above-mentioned technical problems, the technical solution of this utility model is as follows:

[0005] A dynamic dilution apparatus includes a housing (1);

[0006] The rear panel of the enclosure (1) is equipped with a standard gas inlet (2), a dilution gas inlet (3), a bypass gas outlet (4), and a dilution gas outlet (5);

[0007] The standard gas inlet (2) is connected to the input end of the first mass flow meter (6) through a pipeline, and the dilution gas inlet (3) is connected to the input end of the second mass flow meter (7) through a pipeline; the output ends of the first mass flow meter (6) and the second mass flow meter (7) are respectively connected to the bypass gas outlet (4) through a pipeline via a first ferrule right angle tee (8); a second ferrule right angle tee (9) is installed in the middle of the pipeline between the bypass gas outlet (4) and the first ferrule right angle tee (8), and the second ferrule right angle tee (9) is connected to the bypass gas outlet (4) through a pipeline;

[0008] The standard gas inlet (2) is one or more; the number of standard gas inlets (2) is the same as the number of first mass flow meters (6), and the pipelines connected to the output ends of the multiple first mass flow meters (6) are connected in parallel and then connected to the first compression right-angle tee (8); gas pipeline heating devices are respectively installed outside the pipelines connected to the output ends of the multiple first mass flow meters (6), and the temperature is controlled by a controller to prevent condensation and adsorption and ensure the stability of gas dilution; the number of standard gas inlets (2) is no more than 6;

[0009] Both the first mass flow meter (6) and the second mass flow meter (7) are ppm-level mass flow meters;

[0010] The front panel of the enclosure (1) is equipped with a human-machine interface (10), which is electrically connected to the control system and used for the control and display of the control system;

[0011] A switching power supply (11) and a wiring terminal (12) are provided on the back panel of the enclosure (1); the switching power supply (11) is used to start and stop the dynamic dilution instrument; the wiring terminal (12) is used to connect the controller to monitor and control the concentration change during the gas dilution process;

[0012] The rear panel of the enclosure (1) is also equipped with a socket switch (13) and a communication interface (14); the socket switch (13) is used to connect the power supply of the dynamic dilution instrument; the communication interface (14) is used to transmit signals of the dilution instrument to the outside world;

[0013] Exhaust fans (15) are installed on both sides of the enclosure (1); fan covers are installed outside the exhaust fans (15).

[0014] The first mass flow meter (6), the second mass flow meter (7), the switching power supply (11), the terminal block (12), the socket switch (13), the communication interface (14), the exhaust fan (15), and the gas pipeline heating device are electrically connected to the control system.

[0015] Beneficial effects

[0016] This utility model's dynamic dilution apparatus features multiple standard gas inlets, each connected to a mass flow meter, enabling the dilution of various gases with high precision and a wider range of applications. Independent standard gas and dilution gas inlets are provided for standard and sample dilution respectively, fundamentally eliminating cross-contamination. Each mass flow meter output is connected to an external gas pipeline heating device, effectively preventing condensation and adsorption, ensuring the stability of gas dilution. This dilution apparatus eliminates the need for a mixer, resulting in a more compact structure, easier installation, reduced manufacturing and maintenance costs, and higher precision and stability in dilution. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the dynamic dilution device of this utility model;

[0018] Figure 2 This is a schematic diagram of the front panel structure of this utility model;

[0019] Figure 3 This is a schematic diagram of the rear panel structure of this utility model;

[0020] Figure 4 This is a side view of the present invention.

[0021] In the diagram: 1-Box body; 2-Standard gas inlet; 3-Dilution gas inlet; 4-Bypass gas inlet; 5-Dilution gas outlet; 6-First mass flow meter; 7-Second mass flow meter; 8-First ferrule right-angle tee; 9-Second ferrule right-angle tee; 10-Human machine interface; 11-Switching power supply; 12-Terminal block; 13-Socket switch; 14-Communication interface; 15-Exhaust fan. Detailed Implementation

[0022] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present utility model. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments.

[0023] In the description of this utility model, it should be understood that the terms "upper", "lower", "front", "rear", "left", "right", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0024] A dynamic dilution device includes a housing 1; the housing is made of carbon steel with powder coating, which can effectively prevent the outer shell from rusting and corroding, and also has an aesthetic effect, increases the wear resistance of the outer shell, reduces the overall weight of the housing, and makes it more convenient to use.

[0025] The rear panel of housing 1 is equipped with a standard gas inlet 2, a dilution gas inlet 3, a bypass gas outlet 4, and a dilution gas outlet 5;

[0026] The standard gas inlet 2 is connected to the input end of the first mass flow meter 6 via a pipeline, and the dilution gas inlet 3 is connected to the input end of the second mass flow meter 7 via a pipeline; the output ends of the first mass flow meter 6 and the second mass flow meter 7 are respectively connected to the bypass gas outlet 4 via a first compression right-angle tee 8; a second compression right-angle tee 9 is installed in the middle of the pipeline between the bypass gas outlet 4 and the first compression right-angle tee 8, and the second compression right-angle tee 9 is connected to the bypass gas outlet 4 via a pipeline;

[0027] There are one or more standard gas inlets 2; the number of standard gas inlets 2 is the same as the number of first mass flow meters 6, and the pipelines connected to the output ends of the multiple first mass flow meters 6 are connected in parallel and then connected to the first compression fitting right-angle tee 8; gas pipeline heating devices are respectively installed outside the pipelines connected to the output ends of the multiple first mass flow meters 6, and the temperature is controlled by a controller to prevent condensation and adsorption and ensure the stability of gas dilution; the number of standard gas inlets 2 is no more than 6;

[0028] The first mass flow meter 6 and the second mass flow meter 7 are both ppm-level mass flow meters; after the standard gas and dilution gas are mixed through the first ferrule three-way valve, the gas of the target concentration is discharged from the dilution gas outlet.

[0029] The 1101 compression tee is made of polytetrafluoroethylene, which reduces the adsorption of standard gas and minimizes gas mixing errors. It consists of two inlets and one outlet, all using compression fittings, making it easier to connect to the gas tube and providing better sealing.

[0030] The front panel of the housing 1 is equipped with a human-machine interface 10, which is electrically connected to the control system and used for the control and display of the control system. It integrates functions such as main interface, parameter setting, automatic gas distribution, and system settings, and can interact with the mass flow meter in real time.

[0031] A switching power supply 11 and a wiring terminal 12 are installed on the back panel of the housing 1; the switching power supply 11 is used to start and stop the dynamic dilution instrument; the wiring terminal 12 is used to connect to the controller to monitor and control the concentration changes during the gas dilution process.

[0032] The rear panel of the enclosure 1 is also equipped with a socket switch 13 and a communication interface 14; the socket switch 13 is used to connect the power supply of the dynamic diluent; the communication interface 14 is used to transmit signals from the diluent to the outside; it can support the Modbus RTU protocol as standard, and the communication interface can be connected to chromatographs or other control devices to achieve linkage with other devices and improve gas mixing efficiency.

[0033] Exhaust fans 15 are installed on both side panels of the enclosure 1; fan covers are installed on the outside of the exhaust fans 15.

[0034] The first mass flow meter 6, the second mass flow meter 7, the switching power supply 11, the terminal block 12, the socket switch 13, the communication interface 14, the exhaust fan 15, and the gas pipeline heating device are electrically connected to the control system.

[0035] Overall workflow of the dilution instrument:

[0036] 1. Workflow: Standard gas enters the first mass flow meter of the chamber through the standard gas inlet, and dilution gas enters the second mass flow meter of the chamber through the dilution gas inlet. The required output concentration and output flow rate are set through the touch screen. The first and second mass flow meters control the flow rate respectively. The standard gas and dilution gas enter the first ferrule tee through the calculated ratio. After being fully mixed in the first ferrule tee, the required standard gas is output.

[0037] 2. Calibration Procedure: If the output flow rate or concentration of the gas mixing system is inaccurate or deviates, the flow meter can be zeroed and calibrated. The human-machine interface system configuration includes a one-click calibration function. After clicking "Start Calibration," the system will begin a calibration countdown. Once the countdown ends, click the "Stop Calibration" button to complete the calibration and zeroing operation. If a problem with the linearity accuracy of the mass flow controller is found during use, the multi-point calibration function can be used. Multi-point calibration requires a high-precision mass flow controller as a standard meter; linearity calibration is performed by comparing the deviation with the standard meter.

[0038] Finally, it should be noted that the above description is merely a preferred embodiment of this utility model and is not intended to limit the utility model. Although the utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the principles of this utility model should be included within the protection scope of this utility model.

Claims

1. A dynamic dilution apparatus, comprising a housing (1), characterized in that, The rear panel of the enclosure (1) is equipped with a standard gas inlet (2), a dilution gas inlet (3), a bypass gas outlet (4), and a dilution gas outlet (5); The standard gas inlet (2) is connected to the input end of the first mass flow meter (6) through a pipeline, and the dilution gas inlet (3) is connected to the input end of the second mass flow meter (7) through a pipeline; the output ends of the first mass flow meter (6) and the second mass flow meter (7) are respectively connected to the bypass gas outlet (4) through a pipeline via a first ferrule right angle tee (8); a second ferrule right angle tee (9) is installed in the middle of the pipeline between the bypass gas outlet (4) and the first ferrule right angle tee (8), and the second ferrule right angle tee (9) is connected to the bypass gas outlet (4) through a pipeline.

2. The dynamic dilution apparatus according to claim 1, characterized in that, The standard gas inlet (2) is one or more; the number of standard gas inlets (2) is the same as the number of first mass flow meters (6), and the pipelines connected to the output ends of multiple first mass flow meters (6) are connected in parallel and then connected to the first ferrule right angle tee (8); gas pipeline heating devices are respectively installed outside the pipelines connected to the output ends of multiple first mass flow meters (6), and the temperature is controlled by a controller to prevent condensation and adsorption and ensure the stability of gas dilution; the number of standard gas inlets (2) is no more than 6.

3. The dynamic dilution apparatus according to claim 1, characterized in that, Both the first mass flow meter (6) and the second mass flow meter (7) are ppm-level mass flow meters.

4. The dynamic dilution apparatus according to claim 1, characterized in that, The front panel of the enclosure (1) is equipped with a human-machine interface (10), which is electrically connected to the control system and used for the control and display of the control system.

5. The dynamic dilution apparatus according to claim 1, characterized in that, A switching power supply (11) and a wiring terminal (12) are provided on the back panel of the enclosure (1); the switching power supply (11) is used to start and stop the dynamic dilution instrument; the wiring terminal (12) is used to connect the controller to monitor and control the concentration change during the gas dilution process.

6. The dynamic dilution apparatus according to claim 1, characterized in that, The rear panel of the enclosure (1) is also equipped with a socket switch (13) and a communication interface (14); the socket switch (13) is used to connect the power supply of the dynamic dilution instrument; the communication interface (14) is used to transmit signals of the dilution instrument to the outside world.

7. The dynamic dilution apparatus according to claim 1, characterized in that, Exhaust fans (15) are installed on both sides of the enclosure (1); fan covers are installed outside the exhaust fans (15).

8. The dynamic dilution apparatus according to any one of claims 1-7, characterized in that, The first mass flow meter (6), the second mass flow meter (7), the switching power supply (11), the terminal block (12), the socket switch (13), the communication interface (14), the exhaust fan (15), and the gas pipeline heating device are electrically connected to the control system.

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