Multi-station stink dynamic olfactory identification instrument

Abstract

The utility model provides a multi-station stink dynamic sniffing instrument, which comprises a reference gas source device, a detected gas source device, a gas path system, a gas mixing module, a sniffing cup module, a gas cutting control module, a flow control module and an ozone module, and is characterized in that the reference gas source device inputs high-pressure reference gas and regulates the pressure and filters the high-pressure reference gas; the tracheostomy control module realizes switching control of a gas path through a plurality of electromagnetic valves; the flow control module controls the gas flow through a plurality of mass flow controllers and respectively outputs reference gas and detected gas to the gas mixing module in proportion, and the gas mixing module is used for uniformly mixing the reference gas and the detected gas and outputting the mixed gas to the sniffing cup module; the sniffing cup module comprises a plurality of sniffing stations, and the ozone module is used for realizing rapid cleaning of a gas path. According to the utility model, through the design of dynamic gas distribution and multiple sniffing positions, the automation degree and efficiency of odor sniffing analysis are improved, and the effect of quickly cleaning residual odor in the pipeline is realized.

Description

Technical Field

[0001] The utility model relates to the field of malodor olfactory discrimination analysis, and particularly relates to a multi-station dynamic malodor olfactory discriminator. Background Technique

[0002] With the rapid development of social economy and the gradual improvement of people's environmental protection awareness, malodor pollution with wide sources and strong social harmfulness has received more extensive attention, and the detection and analysis of the intensity and concentration of malodor or odor gas have gradually become an important index for environmental detection.

[0003] "Determination of Odor in Ambient Air and Exhaust Gas - Three-Point Comparison Bag Method" (HJ 1262-2022) is currently the only national odor concentration analysis method to support the implementation of relevant pollution gas emission standards. This method adopts a static artificial dilution gas preparation method, and the detection steps are mainly manually completed by judges. For example, this process often requires a special gas preparer to prepare gas, manually express the measurement results, record and calculate the odor concentration, etc. However, this not only has high labor costs and long detection times, but also the experimental process is greatly affected by human factors such as the technical level and proficiency of operators, and the accuracy and comparability of test results cannot be fully guaranteed. Moreover, the data recording and calculation steps are complicated, which is not conducive to data traceability and system management. In addition, if olfactory discrimination gas bags are used in the experiment, a large number of experimental bags will be consumed, resulting in a large amount of plastic waste, which not only increases the cost of experimental consumables but also is not conducive to environmental protection; if gas is transmitted through pipelines, it is easy to produce pollution and residues after olfactory discrimination, which has a great impact on the next olfactory discrimination analysis, and thus seriously affects the determination of odor concentration.

[0004] Therefore, a multi-station dynamic malodor olfactory discriminator is needed that can improve the detection efficiency of malodor pollutants, automatically calculate the odor concentration, automatically record detection data, and quickly clean the malodor residues in the pipeline. Content of the Utility Model

[0005] A multi-station dynamic malodor olfactory discriminator provided by the utility model is mainly used to solve the problems of low efficiency, high consumable cost, and the influence of pollutant residues on the measurement results in the existing malodor olfactory discrimination analysis, so as to improve the automation degree and efficiency of malodor olfactory discrimination analysis and achieve the effect of quickly cleaning the malodor residues in the pipeline.

[0006] The utility model realizes the above object through the following technical solutions:

[0007] A multi-station dynamic odor olfactometer includes a reference gas source device, a measured gas source device, a gas path system, a gas mixing module, and an olfactometer cup module, characterized by further comprising a gas switching control module, a flow control module, and an ozone module; the reference gas source device inputs high-pressure reference gas, and is used for regulating the pressure and filtering the high-pressure reference gas, so as to output constant-pressure odorless reference gas; the measured gas source device is used for placing the measured gas and serving as the power source for transporting the measured gas; the gas path system includes a first gas path connecting the reference gas source device and the olfactometer cup module, a second gas path connecting the reference gas source device and the gas mixing module, a third gas path connecting the measured gas source device and the gas mixing module, and a fourth gas path connecting the gas mixing module and the olfactometer cup module; the gas switching control module includes a plurality of solenoid valves, and the plurality of solenoid valves are respectively connected to the first gas path, the third gas path, and the fourth gas path for switching control of the above gas paths; the flow control module includes a plurality of mass flow controllers, and the plurality of mass flow controllers are respectively connected to the second gas path and the third gas path, and are respectively used for accessing the reference gas and the measured gas, and outputting the reference gas and the measured gas to the gas mixing module in proportion by controlling the gas flow rate. The gas mixing module is used as a power source to mix the reference gas and the measured gas, and output the mixed gas to the olfactometer cup module through the fourth gas path; the olfactometer cup module includes a plurality of olfactometry stations, and each olfactometry station is provided with a first olfactometer cup and a second olfactometer cup for outputting the reference gas, and a third olfactometer cup for outputting the mixed gas; the ozone module is used for heating and generating ozone, and the ozone is used for oxidizing and decomposing the residual odor gas to realize gas path cleaning.

[0008] A further solution is that the reference gas source device includes a first pressure reducing valve, a filter, and a second pressure reducing valve. The inlet of the first pressure reducing valve inputs the high-pressure reference gas, and is used for reducing the pressure of the high-pressure reference gas and automatically maintaining the outlet pressure stable; the inlet of the filter is communicated with the outlet of the first pressure reducing valve, and is used for removing impurities in the gas to improve the cleanliness of the reference gas; the inlet of the second pressure reducing valve is communicated with the outlet of the filter, and is used for performing secondary pressure reduction on the reference gas.

[0009] A further solution is that the gas switching control module includes a total of 9 solenoid valves from the first solenoid valve to the ninth solenoid valve. Among them, the first solenoid valve and the third solenoid valve are both three-way solenoid valves, and the other solenoid valves are all two-way solenoid valves; the flow control module includes a first mass flow controller, a second mass flow controller, a third mass flow controller, and a fourth mass flow controller.

[0010] A further solution is that the gas source device to be measured is a pressure vessel, which contains an air bag filled with the gas to be measured. The air bag is communicated with the first air inlet of the first electromagnetic valve through the pressure vessel. The air outlet of the second pressure reducing valve is respectively communicated with the second air inlet of the first electromagnetic valve and the first air inlet of the third electromagnetic valve. The second air inlet of the third electromagnetic valve is suspended, and its air outlet is communicated with the air inlet of the pressure vessel.

[0011] A further solution is that the gas mixing module includes a gas distributing module, a gas collecting module and a gas mixing chamber. The gas distributing module is provided with three air outlets, and is respectively communicated with the air inlet interfaces of the second mass flow controller, the third mass flow controller and the fourth mass flow controller through these three air outlets. The gas collecting module is provided with three air inlets, and is respectively communicated with the air outlet interfaces of the second mass flow controller, the third mass flow controller and the fourth mass flow controller through these three air inlets. The air outlet of the gas collecting module is communicated with the second air inlet of the gas mixing chamber. The air inlet interface of the first mass flow controller is communicated with the air outlet of the filter through the pipeline of the second gas path, and its air outlet is connected with the first air inlet of the gas mixing chamber. The gas mixing chamber is provided with three air outlets, and these three air outlets are respectively connected with the air inlets of the seventh electromagnetic valve, the eighth electromagnetic valve and the ninth electromagnetic valve. The air outlets of the seventh electromagnetic valve, the eighth electromagnetic valve and the ninth electromagnetic valve are respectively communicated with the first smelling cup, the second smelling cup and the third smelling cup of each smelling station.

[0012] A further solution is that it further includes a reference gas buffer module, which includes a regulating valve and a reference gas buffer chamber. The air inlet of the regulating valve is communicated with the air outlet of the filter through the pipeline of the first gas path, and its air outlet is communicated with the air inlet of the reference gas buffer chamber. The reference gas buffer chamber is provided with three air outlets, and these three air outlets are respectively communicated with the air inlets of the fourth electromagnetic valve, the fifth electromagnetic valve and the sixth electromagnetic valve. The air outlets of the fourth electromagnetic valve, the fifth electromagnetic valve and the sixth electromagnetic valve are respectively communicated with the first smelling cup, the second smelling cup and the third smelling cup of each smelling station.

[0013] A further solution is that the ozone module is placed in the gas distributing module, and it includes a dynamic heating module and an ozone generating module.

[0014] A further solution is that the gas mixing chamber is further provided with a pre-dilution air outlet, which is connected with the air inlet of the second electromagnetic valve, and pre-diluted gas is output from the air outlet of the second electromagnetic valve, so as to preliminarily determine the gas to be measured through the pre-diluted gas.

[0015] A further solution is that it further includes a host computer, which is electrically connected to the multiple solenoid valves and the multiple mass flow controllers respectively, and is used to automatically calculate the odor concentration by collecting the parameters of the odor discrimination process.

[0016] A further solution is that the pressure vessel is made of a transparent material, which is convenient for monitoring the remaining gas volume of the gas to be measured.

[0017] Thus, the utility model has the following beneficial effects:

[0018] 1. By using a pressure reducing valve and a filter, the utility model reduces the pressure and filters the high-pressure reference gas, thereby obtaining a constant-pressure and clean reference gas. The reference gas is used to dynamically dilute the gas to be measured in the mixing chamber to complete gas distribution. Therefore, compared with the existing solutions, there is no need for a dedicated gas distributor to perform manual gas distribution, which improves the gas distribution efficiency, reduces the labor cost, and eliminates the gas bags required for manual gas distribution, thus avoiding a large amount of plastic waste generated by manual gas distribution. This reduces the cost of experimental consumables and is more conducive to environmental protection.

[0019] 2. The utility model is provided with multiple odor discrimination workstations, which can enable multiple odor discriminators to simultaneously perform odor discrimination work on the same gas sample to be measured, greatly improving the odor discrimination efficiency.

[0020] 3. The utility model uses a dynamic heating system and an ozone generation module to generate ozone, which cooperates with high-pressure clean air to quickly decompose and remove the adsorbed and residual odor gases in the pipeline. Compared with the existing manual gas bag odor discrimination method and pipeline transmission gas odor discrimination method, it can achieve the effects of pollution-free, residue-free, and rapid cleaning, avoid affecting the next odor discrimination analysis operation, and improve the accuracy and efficiency of the odor discrimination analysis operation.

[0021] 4. The utility model is designed with a pre-dilution outlet, which is convenient for the gas distributor to preliminarily determine the gas sample to be measured.

[0022] 5. The utility model uses a precision gas mass flow controller for proportional dilution, with high precision and stability, reducing the human control error, and the dilution multiple is between 10 and 100,000 times.

[0023] 6. The utility model uses the Venturi principle to transfer the gas sample to be measured, avoiding the pollution of the gas sample to be measured by the transfer power system of the gas sample to be measured, and increasing the effect of gas mixing and dilution.

[0024] 7. The utility model uses a host computer to collect the parameters of the odor discrimination process, and can automatically calculate the odor concentration and generate a data report. Compared with the existing solutions, it reduces the manual intervention and can fully guarantee the accuracy and comparability of the test results.

[0025] 8. The utility model uses a pressure vessel made of transparent material to place the gas sample to be measured, which is convenient for observing the usage situation of the gas sample to be measured in real time, and the remaining gas volume of the sample can also be queried in real time through the operation interface.

[0026] The following further elaborates on the present utility model in conjunction with the accompanying drawings and specific embodiments. Description of the Drawings

[0027] Figure 1 is the gas circuit schematic diagram of the olfactometer provided by the embodiment of the present utility model;

[0028] Figure 2 is the overall structure diagram of the olfactometer provided by the embodiment of the present utility model;

[0029] Figure 3 is the top view of the olfactometer provided by the embodiment of the present utility model.

[0030] The list of components listed in the drawings is as follows:

[0031] 1: Gas source device for the gas to be measured; 2: Third solenoid valve; 3: First solenoid valve;

[0032] 4: Second pressure reducing valve; 5: First pressure reducing valve; 6: Filter;

[0033] 7: Ozone module; 8: First mass flow controller; 9: Second mass flow controller;

[0034] 10: Third mass flow controller; 11: Fourth mass flow controller; 12: Mixing chamber;

[0035] 13: Second solenoid valve; 14: Control valve; 15: Reference gas buffer chamber;

[0036] 16: Fourth solenoid valve; 17: Fifth solenoid valve; 18: Sixth solenoid valve;

[0037] 19: Seventh solenoid valve 7; 20: Eighth solenoid valve; 21: Ninth solenoid valve;

[0038] 22: Olfactory cup module; 23: Gas distribution module; 24: Gas collection module;

[0039] 25: Working platform; 26: Olfactometry station; 27: Partition. Specific Embodiments

[0040] To make the objectives, technical solutions, and advantages of the embodiments of the present utility model clearer, the technical solutions of the embodiments 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. Apparently, the described embodiments are some, but not all, of the embodiments of the present utility model. All other embodiments obtained by those of ordinary skill in the art based on the described embodiments of the present utility model without creative efforts shall fall within the scope of protection of the present utility model.

[0041] An embodiment of a multi-station dynamic odor olfactometer

[0042] See Figure 1 , a multi-station dynamic odor olfactometer involved in the present utility model includes a reference gas source device, a measured gas source device 1, a gas path system, a gas mixing module, and an olfactometer cup module 22, and is characterized in that it further includes a gas switching control module, a flow control module, and an ozone module 7; the reference gas source device inputs high-pressure reference gas, and is used to regulate and filter the high-pressure reference gas, so as to output a constant-pressure odorless reference gas; the measured gas source device 1 is used to place the measured gas and serve as the power source for transporting the measured gas; the gas path system includes a first gas path connecting the reference gas source device and the olfactometer cup module 22, a second gas path connecting the reference gas source device and the gas mixing module, a third gas path connecting the measured gas source device 1 and the gas mixing module, and a fourth gas path connecting the gas mixing module and the olfactometer cup module 22; the gas switching control module includes a plurality of solenoid valves, and the plurality of solenoid valves are respectively connected to the first gas path, the third gas path, and the fourth gas path, and are used for the switching control of the above gas paths; the flow control module includes a plurality of mass flow controllers, and the plurality of mass flow controllers are respectively connected to the second gas path and the third gas path, and are respectively used to access the reference gas and the measured gas, and output the reference gas and the measured gas to the gas mixing module in proportion by controlling the gas flow rate. The gas mixing module is used as a power source to mix the reference gas and the measured gas, and output the mixed gas to the olfactometer cup module 22 through the fourth gas path; the olfactometer cup module 22 includes a plurality of olfactometry stations 26, and each olfactometry station 26 is provided with a first olfactometer cup and a second olfactometer cup for outputting the reference gas, and a third olfactometer cup for outputting the mixed gas; the ozone module 7 is used to generate heat and generate ozone, and the ozone is used to oxidize and decompose the remaining odor gas to achieve gas path cleaning.

[0043] See Figures 2-3, specifically, in this embodiment, the host computer, the tracheotomy control module, the flow control module, the ozone module 7, the reference gas buffer module, the gas mixing module, and the olfactory cup module 22 are integrated on a working platform 25. The working platform 25 is provided with 6 olfactory discrimination stations 26. The olfactory discrimination stations 26 are separated by partitions 27 to form independent working areas. Each olfactory discrimination station 26 is equipped with a touch screen, enabling six olfactory discriminators to simultaneously discriminate the same gas sample to be measured, answer independently, and not interfere with each other, thereby improving the olfactory discrimination efficiency and accuracy.

[0044] Specifically, the height of the olfactory discrimination port in this embodiment conforms to the ergonomic design, and the output speed of the gas distribution airflow meets the comfort requirements of normal human breathing.

[0045] In this embodiment, the reference gas source device includes a first pressure reducing valve 5, a filter 6, and a second pressure reducing valve 4. The inlet of the first pressure reducing valve 5 inputs the high-pressure reference gas, which is used to reduce the pressure of the high-pressure reference gas and automatically maintain the stability of the outlet pressure. The inlet of the filter 6 is connected to the outlet of the first pressure reducing valve 5, which is used to remove impurities in the gas to improve the cleanliness of the reference gas. The inlet of the second pressure reducing valve 4 is connected to the outlet of the filter 6, which is used to perform secondary pressure reduction on the reference gas.

[0046] In this embodiment, the tracheotomy control module includes a total of 9 solenoid valves from the first solenoid valve 3 to the ninth solenoid valve 21. Among them, the first solenoid valve 3 and the third solenoid valve 2 are both three-way solenoid valves, and the other solenoid valves are all two-way solenoid valves. The flow control module includes a first mass flow controller 8, a second mass flow controller 9, a third mass flow controller 10, and a third mass flow controller 11.

[0047] Specifically, in this embodiment, the present invention processes the pipelines, valves, and olfactory cups of the gas path system to reduce the adsorption of malodorous gases and avoid cross-contamination.

[0048] In this embodiment, the gas source device 1 to be measured is a pressure vessel. The pressure vessel is internally provided with an air bag filled with the gas to be measured. The air bag is connected to the first inlet of the first solenoid valve 3 through the pressure vessel. The outlet of the second pressure reducing valve 4 is respectively connected to the second inlet of the first solenoid valve 3 and the first inlet of the third solenoid valve 2. The second inlet of the third solenoid valve 2 is suspended, and its outlet is connected to the inlet of the pressure vessel.

[0049] In this embodiment, the gas mixing module includes a gas distribution module 23, a gas collecting module 24, and a gas mixing chamber 12. The gas distribution module 23 is provided with three gas outlets, and is respectively communicated with the intake interfaces of a second mass flow controller 9, a third mass flow controller 10, and a third mass flow controller 11 through these three gas outlets. The gas collecting module 24 is provided with three gas inlets, and is respectively communicated with the outlet interfaces of the second mass flow controller 9, the third mass flow controller 10, and the third mass flow controller 11 through these three gas inlets. The gas outlet of the gas collecting module 24 is communicated with the second gas inlet of the gas mixing chamber 12. The intake interface of the first mass flow controller 8 is communicated with the outlet of the filter 6 through the pipeline of the second gas path, and its outlet is connected to the first gas inlet of the gas mixing chamber 12. The gas mixing chamber 12 is provided with three gas outlets, and these three gas outlets are respectively connected to the intake interfaces of a seventh solenoid valve 19, an eighth solenoid valve 20, and a ninth solenoid valve 21. The outlet interfaces of the seventh solenoid valve 19, the eighth solenoid valve 20, and the ninth solenoid valve 21 are respectively communicated with the first smelling cup, the second smelling cup, and the third smelling cup of each smelling station 26.

[0050] In this embodiment, it further includes a reference gas buffer module. The reference gas buffer module includes a regulating valve 14 and a reference gas buffer chamber 15. The intake interface of the regulating valve 14 is communicated with the outlet of the filter 6 through the pipeline of the first gas path, and its outlet is communicated with the intake interface of the reference gas buffer chamber 15. The reference gas buffer chamber 15 is provided with three gas outlets, and these three gas outlets are respectively communicated with the intake interfaces of a fourth solenoid valve 16, a fifth solenoid valve 17, and a sixth solenoid valve 18. The outlet interfaces of the fourth solenoid valve 16, the fifth solenoid valve 17, and the sixth solenoid valve 18 are respectively communicated with the first smelling cup, the second smelling cup, and the third smelling cup of each smelling station 26.

[0051] In this embodiment, the ozone module 7 is placed inside the gas distribution module 23, and it includes a dynamic heating module and an ozone generation module.

[0052] Specifically, the ozone module 7 in this embodiment is internally provided with a dynamic heating system and an ozone generation system, which can cooperate with high-pressure clean air to quickly decompose and remove the adsorbed and residual malodorous gases in the pipeline. Its odor cleaning rate is:

[0053]

[0054] Wherein, k: odor cleaning rate; R: odor molar constant; T: thermodynamic temperature; C: concentration of strong oxidizing gas; Es: surface activation energy; ε: frequency factor; α: reaction activity.

[0055] Specifically, in this embodiment, the cleaning time can be flexibly set according to the degree of residual malodorous gas in the pipeline.

[0056] Specifically, this embodiment can also provide ozone oxidation performance through a catalyst, enabling ozone to react more deeply with the malodorous gases adsorbed and remaining in the pipeline, thereby thoroughly oxidizing the remaining malodorous gases and enabling efficient utilization of ozone for cleaning the pipeline.

[0057] Specifically, when cleaning the gas pipeline in this embodiment, the gas flow direction in the gas pipeline is switched by controlling the first solenoid valve 3 to the ninth solenoid valve 21, and the output gas flow is controlled by controlling the regulating valve 14, the first mass flow controller 8 to the third mass flow controller 11, so as to achieve rapid cleaning of the pipeline.

[0058] In this embodiment, the mixing chamber 12 is further provided with a pre-dilution air outlet, which is connected to the inlet of the second solenoid valve 13, and the pre-diluted gas is output from the outlet of the second solenoid valve 13, so as to preliminarily determine the measured gas through the pre-diluted gas.

[0059] In this embodiment, it further includes a host computer, which is electrically connected to the multiple solenoid valves and the multiple mass flow controllers respectively, and is used to automatically calculate the odor concentration and automatically generate a data report by collecting the parameters of the odor discrimination process.

[0060] Specifically, this embodiment is also provided with a temperature and humidity sensor, an atmospheric pressure detection sensor, and a noise monitor. The host computer receives the temperature, humidity, atmospheric pressure, and noise data, so as to realize real-time monitoring of the temperature, humidity, atmospheric pressure, and noise data in the laboratory and generate a data report.

[0061] In this embodiment, the pressure vessel is made of a transparent material, which is convenient for monitoring the remaining gas volume of the measured gas.

[0062] Specifically, this embodiment uses a barrel-shaped pressure vessel made of a transparent material to place the measured gas sample, which is convenient for observing the usage situation of the measured gas sample in real time, and the remaining gas volume of the sample can also be queried in real time through the operation interface of the host computer.

[0063] The above embodiments are only the preferred embodiments of the present invention and cannot be used to limit the scope of protection of the present invention. Any non-substantive changes and substitutions made by those skilled in the art based on the present invention belong to the scope of protection required by the present invention.

Claims

1. A multi-station dynamic odor olfactometer, comprising a reference gas source device, a measured gas source device, a gas path system, a gas mixing module, and an olfactometer cup module, characterized in that It further includes a tracheotomy control module, a flow control module, and an ozone module; The reference gas source device inputs high-pressure reference gas, and is used for regulating the pressure and filtering the high-pressure reference gas, so as to output a constant-pressure and odorless reference gas; the measured gas source device is used for placing the measured gas and serving as the power source for the transportation of the measured gas; the gas path system includes a first gas path connecting the reference gas source device and the olfactory cup module, a second gas path connecting the reference gas source device and the gas mixing module, a third gas path connecting the measured gas source device and the gas mixing module, and a fourth gas path connecting the gas mixing module and the olfactory cup module; the tracheotomy control module includes a plurality of solenoid valves, and the plurality of solenoid valves are respectively connected to the first gas path, the third gas path, and the fourth gas path for switching control of the above gas paths; the flow control module includes a plurality of mass flow controllers, and the plurality of mass flow controllers are respectively connected to the second gas path and the third gas path, and are respectively used for accessing the reference gas and the measured gas, and outputting the reference gas and the measured gas to the gas mixing module in proportion by controlling the gas flow rate. The gas mixing module is used as a power source to mix the reference gas and the measured gas, and output the mixed gas to the olfactory cup module through the fourth gas path; the olfactory cup module includes a plurality of olfactory discrimination workstations, and each olfactory discrimination workstation is provided with a first olfactory cup and a second olfactory cup for outputting the reference gas, and a third olfactory cup for outputting the mixed gas; the ozone module is used for heating and generating ozone, and the ozone is used for oxidizing and decomposing the residual odor gas to realize gas path cleaning.

2. The multi-station dynamic odor discriminator according to claim 1, wherein: The reference gas source device includes a first pressure reducing valve, a filter, and a second pressure reducing valve. The inlet of the first pressure reducing valve inputs the high-pressure reference gas, and is used for reducing the pressure of the high-pressure reference gas and automatically maintaining the stability of the outlet pressure; the inlet of the filter is communicated with the outlet of the first pressure reducing valve, and is used for removing impurities in the gas to improve the cleanliness of the reference gas; the inlet of the second pressure reducing valve is communicated with the outlet of the filter, and is used for performing secondary pressure reduction on the reference gas.

3. The multi-station dynamic odor discriminator according to claim 2, wherein: The tracheotomy control module includes a total of 9 solenoid valves from the first solenoid valve to the ninth solenoid valve. Among them, the first solenoid valve and the third solenoid valve both adopt three-way solenoid valves, and the other solenoid valves all adopt two-way solenoid valves; the flow control module includes a first mass flow controller, a second mass flow controller, a third mass flow controller, and a fourth mass flow controller.

4. The multi-station dynamic odor discriminator according to claim 3, wherein: The gas source device of the gas to be measured is a pressure vessel, which contains an air bag filled with the gas to be measured. The air bag is communicated with the first air inlet of the first electromagnetic valve through the pressure vessel. The air outlet of the second pressure reducing valve is respectively communicated with the second air inlet of the first electromagnetic valve and the first air inlet of the third electromagnetic valve. The second air inlet of the third electromagnetic valve is suspended, and its air outlet is communicated with the air inlet of the pressure vessel.

5. The multi-station dynamic odor discrimination instrument according to claim 4, wherein: The gas mixing module includes a gas distribution module, a gas converging module and a gas mixing chamber. The gas distribution module is provided with three air outlets, and is respectively communicated with the air inlet interfaces of the second mass flow controller, the third mass flow controller and the fourth mass flow controller through these three air outlets. The gas converging module is provided with three air inlets, and is respectively communicated with the air outlet interfaces of the second mass flow controller, the third mass flow controller and the fourth mass flow controller through these three air inlets. The air outlet of the gas converging module is communicated with the second air inlet of the gas mixing chamber. The air inlet interface of the first mass flow controller is communicated with the air outlet of the filter through the pipeline of the second gas path, and its air outlet is connected with the first air inlet of the gas mixing chamber; The gas mixing chamber is provided with three air outlets, and these three air outlets are respectively connected with the air inlets of the seventh electromagnetic valve, the eighth electromagnetic valve and the ninth electromagnetic valve. The air outlets of the seventh electromagnetic valve, the eighth electromagnetic valve and the ninth electromagnetic valve are respectively communicated with the first odor discrimination cup, the second odor discrimination cup and the third odor discrimination cup of each odor discrimination station.

6. The multi-station dynamic odor discrimination instrument according to claim 3, wherein: It further includes a reference gas buffer module, which includes a regulating valve and a reference gas buffer chamber. The air inlet of the regulating valve is communicated with the air outlet of the filter through the pipeline of the first gas path, and its air outlet is communicated with the air inlet of the reference gas buffer chamber. The reference gas buffer chamber is provided with three air outlets, and these three air outlets are respectively communicated with the air inlets of the fourth electromagnetic valve, the fifth electromagnetic valve and the sixth electromagnetic valve. The air outlets of the fourth electromagnetic valve, the fifth electromagnetic valve and the sixth electromagnetic valve are respectively communicated with the first odor discrimination cup, the second odor discrimination cup and the third odor discrimination cup of each odor discrimination station.

7. The multi-station dynamic odor discrimination instrument according to claim 5, wherein: The ozone module is placed in the gas distribution module, and includes a dynamic heating module and an ozone generation module.

8. The multi-station dynamic odor discrimination instrument according to claim 5, wherein: The gas mixing chamber is further provided with a pre-dilution air outlet, and the pre-dilution air outlet is connected with the air inlet of the second electromagnetic valve. The pre-diluted gas is output from the air outlet of the second electromagnetic valve, so as to preliminarily judge the gas to be measured through the pre-diluted gas.

9. The multi-station dynamic odor discrimination instrument according to any one of claims 1-8, wherein: It further includes a host computer, which is electrically connected with a plurality of the electromagnetic valves and a plurality of the mass flow controllers respectively, and is used for automatically calculating the odor concentration by collecting the odor discrimination process parameters.

10. The multi-station dynamic odor olfactometer according to claim 4, characterized in that: The pressure vessel is made of a transparent material, which is convenient for monitoring the remaining gas volume of the gas to be measured.

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