Constant Gas-Phase Organic Matter Concentration Creating Device and Its Pretreatment Method

Abstract

The present application provides a device for creating a constant concentration of gaseous organic substances and a pretreatment method thereof. The device for creating a constant concentration of gaseous organic substances includes a chamber body; the chamber body has a first inner cavity that can be closed; a generating source; the generating source is arranged in the first inner cavity; wherein, the generating source includes a carrier and a target organic substance, the target organic substance is mixed in the carrier, and the target organic substance is configured to be released from the carrier. The device for creating a constant concentration of gaseous organic substances in this embodiment has a simpler structure, low cost, and significantly reduced floor space, and the device is simple and convenient to operate; because the content of the target organic substance in the generating source can be determined, and the organic substance concentration in the chamber body can also be determined, the organic substance concentration in the chamber body can be guaranteed. The adjustable gas phase concentration can be achieved through simple preparation of source materials, and the constant generation of a broad-spectrum of gaseous organic substances including volatile and semi-volatile organic substances can be fully realized.

Description

Technical Field

[0001] The present application belongs to the field of gas phase organic matter creation, and more specifically, to a constant gas phase organic matter concentration creation device and a pretreatment method thereof. Background Art

[0002] The creation of a constant and controllable concentration of gas-phase organic matter is crucial in many application areas, such as scientific research, air quality sensor calibration and testing, industrial process control, and odor and fragrance development. In the prior art, the dynamic dilution method is mainly used to create the gas-phase organic concentration, by introducing a gas cylinder or heating the liquid organic matter to generate a high-concentration organic gas and mixing it with clean air or an inert gas such as nitrogen to achieve the desired concentration. However, the gas-phase organic matter concentration creation device using the dynamic dilution method has a complex structure. Summary of the invention

[0003] The purpose of the embodiments of the present application is to provide a device for creating a constant gas-phase organic matter concentration, so as to solve the technical problem of the complicated structure of the device for creating a gas-phase organic matter concentration in the prior art.

[0004] In order to achieve the above-mentioned purpose, the technical solution adopted in the present application is: to provide a device for creating a constant gas phase organic matter concentration, the device for creating a constant gas phase organic matter concentration comprising:

[0005] The cabin has a first closable inner cavity;

[0006] A generating source; the generating source is arranged in the first inner cavity;

[0007] The generating source includes a carrier and a target organic matter, the target organic matter is mixed in the carrier, and the target organic matter is configured to be able to transfer mass into the first inner cavity.

[0008] Optionally, the generating source is a membrane-like structure, and the membrane-like structure is arranged in the first inner cavity.

[0009] Optionally, a protective layer is provided on the inner wall of the cabin, and the generating source is provided on the protective layer.

[0010] Optionally, the generator is provided with a packaging structure for packaging the generator;

[0011] The packaging structure includes a base layer and a coating layer, the generator is arranged on the base layer, the coating layer covers the side of the generator away from the base layer, and the coating layer is configured to be detachable from the generator;

[0012] The generating source is bonded to the inner wall of the cabin through a base layer.

[0013] Optionally, the carrier comprises at least one of starch, bentonite and polymethylcellulose;

[0014] And / or, the target organic matter includes at least one of benzene, toluene, trichloroethylene, phthalate, organophosphate, and polybrominated diphenyl ether.

[0015] Optionally, the device for creating a constant gas-phase organic matter concentration further comprises a temperature control mechanism, and the temperature control mechanism is used to control the temperature in the first inner cavity.

[0016] Optionally, the temperature control mechanism includes a temperature-controlled insulation barrel having a second inner cavity, the temperature-controlled insulation barrel is configured to control the temperature in the second inner cavity, and the cabin is disposed in the second inner cavity.

[0017] Optionally, the device for creating a constant gas-phase organic matter concentration further includes a flow field generating mechanism, and the flow field generating mechanism is configured to form a flow field at the location of the generating source.

[0018] Optionally, the cabin comprises a cabin body and a cabin cover, the cabin body is provided with a first opening communicating with the first inner cavity, and the cabin cover is used to close the first opening;

[0019] The flow field generating mechanism comprises a driving mechanism and blades. The blades are arranged in the first inner cavity, the driving mechanism is arranged on the outer side of the hatch, and the driving mechanism and the blades are transmission-connected to drive the blades to form a flow field.

[0020] The present application also provides a pretreatment method, which is used to treat the above-mentioned constant gas phase organic matter concentration creating device, and the pretreatment method comprises:

[0021] preparing a viscous intermediate product, the viscous intermediate product comprising a carrier and a target organic matter;

[0022] A generating source is prepared by using a viscous intermediate product and is placed in a cabin.

[0023] Optionally, the carrier includes polymethylcellulose, starch and bentonite;

[0024] The preparation of the viscous intermediate product includes: dispersing polymethyl cellulose, starch and bentonite in water, and adding the target organic liquid to form a mixed liquid; fully stirring under heating conditions to gradually evaporate the water in the mixed liquid to a viscous state to form a viscous intermediate product.

[0025] Optionally, providing a substrate layer;

[0026] Applying the viscous intermediate product on the base layer to form the source of the film-like structure;

[0027] Covering the source with a coating layer to encapsulate the source;

[0028] The generating source is attached to the inner wall of the cabin through the base layer, and the coating layer is torn off.

[0029] The beneficial effects of the constant gas-phase organic matter concentration creation device and its pretreatment method provided by this application are as follows: Compared with the prior art, the constant gas-phase organic matter concentration creation device in the embodiments of this application includes a chamber body and a generation source arranged in the chamber body. The generation source includes a carrier and a target organic matter mixed in the carrier. By releasing the target organic matter in the chamber body through the generation source, the creation of a constant gas-phase organic matter concentration is realized. Compared with the existing dynamic dilution method, the structure of the constant gas-phase organic matter concentration creation device in this embodiment is simpler, with lower cost and significantly reduced floor space, and the device operation is simple and convenient; because the content of the target organic matter in the generation source can be determined, and the organic matter concentration in the chamber body can also be determined, the organic matter concentration in the chamber body can be guaranteed. The adjustable gas-phase concentration can be realized through simple preparation of source materials, and the constant generation of a broad-spectrum gas-phase organic matter including volatile and semi-volatile organic matters can be fully realized. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] In order to more clearly illustrate the technical solutions in the embodiments of this application, the following will briefly introduce the drawings required for use in the embodiments or the description of the prior art. Obviously, the following drawings are only some embodiments of this application. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0031] Figure 1 Schematic diagram of the constant gas-phase organic matter concentration creation device in the embodiments of this application with the bucket lid closed;

[0032] Figure 2 Schematic diagram of the constant gas-phase organic matter concentration creation device in the embodiments of this application with the bucket lid open;

[0033] Figure 3 Explosion schematic diagram of the constant gas-phase organic matter concentration creation device in the embodiments of this application;

[0034] Figure 4 Partial cross-sectional schematic diagram of the constant gas-phase organic matter concentration creation device in an embodiment of this application;

[0035] Figure 5 Encapsulation schematic diagram of the generation source in another embodiment of this application;

[0036] Figure 6 Flowchart of the pretreatment method in the embodiments of this application;

[0037] Figure 7 Flowchart of preparing a viscous intermediate product in the embodiments of this application;

[0038] Figure 8 Flowchart of the encapsulation and arrangement of the generation source in the embodiments of this application.

[0039] Among them, the reference numerals in the figures are as follows: cabin body 1, cabin body main body 11; cabin cover 12; source 2; base layer 21; film coating layer 22; protective layer 3; temperature control insulation barrel 4; barrel cover 41; fastener 42; drive mechanism 51; blade 52; sealing ring 6. Specific embodiments

[0040] In order to make the technical problems, technical solutions and beneficial effects to be solved by this application clearer, the following further details this application in combination with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain this application and are not used to limit this application.

[0041] It should be noted that when an element is referred to as being "fixed to" or "disposed on" another element, it can be directly on the other element or indirectly on the other element. When an element is referred to as being "connected to" another element, it can be directly connected to the other element or indirectly connected to the other element.

[0042] It should be understood that the orientation or positional relationship indicated by the terms "length", "width", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. is based on the orientation or positional relationship shown in the accompanying drawings, and is only for the convenience of describing this application 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 this application.

[0043] In addition, the terms "first" and "second" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include one or more of such features. In the description of this application, "a plurality of" means two or more, unless otherwise specifically defined.

[0044] Creating a gaseous organic compound with a constant and controllable concentration is crucial in many application fields, such as scientific research, calibration testing of air quality sensors, industrial process control, and odor and fragrance development. If a controllable gaseous organic concentration atmosphere cannot be effectively created, it will directly affect the test accuracy and application effect of related products, and further lead to increased product costs, compliance problems, and even safety hazards. Therefore, it is crucial to use precise equipment and technologies to control and detect the concentration of gaseous organic compounds to ensure the stability and consistency of products.

[0045] At present, the dynamic dilution method is mainly used to create the concentration of gaseous organic compounds. Specifically, high-concentration organic compound gas generated by introducing or heating liquid organic compounds in a gas cylinder is mixed with clean air or inert gas such as nitrogen to achieve the required concentration. Although this method can achieve the purpose of creating the concentration of gaseous organic compounds, there are the following problems:

[0046] Complex equipment structure: Equipment such as gas cylinders, gas pipeline and connectors, and mass flow meters need to be purchased, covering a large area. The setup and debugging process of the device is complex. The device is complex and expensive, and requires regular calibration and maintenance, with high costs;

[0047] Low precision and stability: When creating a low gaseous concentration, any minor flow fluctuation will significantly affect the accuracy of the generated concentration, with low robustness;

[0048] Long response time: Due to gas mixing and flow adjustment, the system requires a certain response time to reach the new set concentration and is difficult to create quickly;

[0049] High selectivity for organic compounds: This method is only applicable to highly volatile organic compounds and cannot generate and dilute low-volatile macromolecular organic compounds that are difficult to vaporize. Moreover, they are likely to remain in the pipeline flow channel and are difficult to generate.

[0050] In view of the defects of the above-mentioned device for creating the concentration of gaseous organic compounds, it is urgent to develop a simple and efficient device for creating a constant gaseous organic compound concentration to simplify the process of creating the gaseous organic concentration.

[0051] Please refer to Figure 1 、 Figure 2 、 Figure 3 and Figure 4 to describe the device for creating a constant gaseous organic compound concentration provided in the embodiments of the present application. The device for creating a constant gaseous organic compound concentration includes:

[0052] A cabin body 1; the cabin body 1 has a closable first inner cavity;

[0053] A generating source 2; the generating source is arranged in the first inner cavity;

[0054] Wherein, the generating source 2 includes a carrier and a target organic compound. The target organic compound is mixed in the carrier, and the target organic compound is configured to be released from the carrier and to be mass-transferred into the first inner cavity.

[0055] In this embodiment, the cabin 1 is the main structure of the entire device and has a closable first inner cavity. The sealing property of the cabin 1 can prevent the influence of external gas on the internal environment, ensure the stability of the internal gas-phase organic matter concentration, and thus enable it to serve as a space for creating the gas-phase organic matter concentration. The first inner cavity of the cabin 1 is closable, and the closure of the cabin 1 can be achieved in various ways such as using a lid, a gate, a sealing plate, etc. By opening the closure, the source 2 can be placed into the first inner cavity of the cabin 1, and then the cabin 1 can be closed through the closure.

[0056] The source 2 is the origin of mass-transfer releasing the target organic matter. After the target organic matter is mass-transferred and released into the cabin 1, a gas-phase organic concentration atmosphere can be created. The source 2 includes a carrier and the target organic matter. The target organic matter is mixed in the carrier, and through the action of the carrier, the target organic matter can be released into the gas phase of the cabin 1 at a certain rate. By controlling the type and properties of the carrier, as well as the mixing ratio of the target organic matter in the carrier, the concentration of the gas-phase organic matter in the cabin 1 can be precisely regulated. The carrier here can be a porous material, a polymer substrate, or a specially prepared carrier, etc. The target organic matter can include a broad spectrum of gas-phase organic matters including volatile and semi-volatile organic matters. Volatile organic matters are, for example, (benzene, toluene, trichloroethylene, etc.), and semi-volatile organic matters are, for example, (phthalic acid esters, organophosphates, polybrominated diphenyl ethers, etc.).

[0057] When using the constant gas-phase organic matter concentration creating device to create the gas-phase organic matter, the source 2 is placed in the first inner cavity of the cabin 1, and the first inner cavity is closed. The carrier in the source 2 starts to act, and the target organic matter is released into the gas phase of the cabin 1 at a certain rate. The sealing property of the cabin 1 ensures the relative stability of the internal gas phase, and thus a constant gas-phase organic matter concentration can be maintained within a certain period of time. By adjusting the amount of the target organic matter in the source 2, the concentration and stability of the gas-phase organic matter can be further precisely controlled.

[0058] Compared with the existing dynamic dilution method, the constant gas-phase organic matter concentration creation device of this embodiment has a simpler structure, lower cost, and significantly reduced floor space, and the device operation is simple and convenient; because the content of the target organic matter in the source 2 can be determined, and the organic matter concentration in the chamber 1 can also be determined, the organic matter concentration in the chamber 1 can be guaranteed. By simply preparing the source materials, the gas-phase concentration can be adjusted, and the constant generation of a broad-spectrum gas-phase organic matter including volatile and semi-volatile organic matters can be fully realized. In addition, the constant gas-phase organic matter concentration creation device of this embodiment can not only ensure the stability of the gas-phase organic concentration inside the chamber 1, so as to form a constant organic matter concentration atmosphere inside the chamber 1, but also be used as an output source device to provide a constant gas-phase organic matter to the external environment at a constant gas-phase concentration. That is, this embodiment can provide the creation of gas-phase organic concentrations in two types of environments, inside and outside the device chamber, and is effectively applicable to various professional fields and application environments.

[0059] Please refer to Figure 4 , in some embodiments of the present application, the source 2 is a film structure, and the film structure is arranged in the first inner cavity.

[0060] In this embodiment, the source 2 is a film structure. The film structure is a flat structure with a large area and is mainly formed by a carrier material, in which the target organic matter is mixed or loaded. The film structure is arranged in the first inner cavity of the chamber 1. This means that it is directly exposed to the gas-phase environment in the chamber 1 and can fully exchange with the gas in the chamber 1, so that the target organic matter therein is released into the gas phase of the chamber 1. The film structure can be arranged at positions such as the inner wall, top, and bottom of the chamber 1, or a component specifically for loading the film structure can be provided in the chamber 1, and the film structure can be arranged thereon.

[0061] Compared with other structures, on the one hand, because the film structure has a large surface, these surfaces can all achieve gas-phase exchange with the inside of the chamber 1, so that the target organic matter can achieve a rapid and uniform concentration distribution in the chamber 1; on the other hand, the film structure is a flat structure with a relatively thin thickness, which can shorten the travel distance of the target organic matter released into the chamber 1, so as to release the internal organic matter more quickly and thoroughly, which helps to shorten the time required to create the corresponding gas-phase organic concentration and ensure the stability of the gas-phase organic matter concentration inside the chamber 1.

[0062] In addition, in addition to using a film structure, the source 2 can also be in various forms, for example, block-shaped, sheet-shaped, granular, and so on.

[0063] Please refer to Figure 4In some embodiments of the present application, a protective layer 3 is provided on the inner wall of the cabin 1, and the source 2 is provided on the protective layer 3. On the one hand, the protective layer 3 can isolate the membrane structure from the cabin 1, thereby protecting the cabin 1; on the other hand, the protective layer 3 can have a rough surface, which helps to improve the adhesion of the organic matter source 2 and ensure that the source 2 can be firmly attached to the inner wall of the cabin 1. The protective layer 3 can be made of materials such as plastic film and masking tape.

[0064] See also Figure 5 In some other embodiments of the present application, the generator is provided with a packaging structure for packaging the generator; the packaging structure includes a base layer 21 and a coating layer 22, the generator is arranged on the base layer 21, the coating layer 22 covers the side of the generator away from the base layer 21, and the coating layer 22 is configured to be detachable from the generator; the generator is bonded to the inner wall of the cabin through the base layer 21.

[0065] During the period from the preparation of the source to the placement of the source in the cabin, the target organic matter in the source may volatilize. Therefore, in this embodiment, the source is provided with a packaging structure for packaging the source. The main function of the packaging structure is to prevent the source from volatilizing and provide a relatively closed environment for the source until the source is placed in the cabin, allowing the target organic matter to be released. The packaging structure is mainly composed of a base layer 21 and a coating layer 22.

[0066] The base layer 21 is the bearing base of the source, providing stable support for the source. At the same time, the base layer 21 also bears the function of connecting with the inner wall of the cabin, so that the source can be stably installed inside the cabin. The coating layer 22 covers the side of the source away from the base layer 21, and together with the base layer 21, it forms a relatively closed space, which completely wraps the source, further enhancing the barrier effect on the volatilization of the target organic matter. The material selection of the base layer 21 and the coating layer 22 first needs to consider not reacting with the target organic matter. However, the requirements of the base layer 21 and the coating layer 22 are different. The base layer 21 needs to provide stable support for the source, so it needs strong strength, for example, its strength can be ensured by increasing its thickness, and it is necessary to ensure that the source is stably attached to the base layer 21. Therefore, the surface where the base layer 21 contacts the source can be processed into a rough surface so that the source can be in good contact with the base layer 21 without separation. The coating layer 22 is just the opposite. It can use a lighter and thinner material, and it is necessary to pay attention to its easy peeling from the source. Specifically, the base layer 21 can be made of modified silicone, polyurethane and other materials, which are easier to combine with the source and can be processed into a rough surface; the coating layer 22 can be made of expanded polytetrafluoroethylene, fluorinated polymer and other materials, which are easier to peel off.

[0067] In some embodiments of the present application, the carrier includes starch, bentonite, and methylcellulose. Starch is a natural polymer with the ability to form films. It provides the main skeletal structure in the paste and can form a film structure after drying, so it is used as the main film-forming matrix. Bentonite is a layered silicate mineral with good water absorption and dispersibility. Adding it to starch can improve the tensile strength and toughness of the film. In the viscous state, bentonite can increase the viscosity and improve the adhesion performance. Moreover, the water absorption and swelling characteristics of bentonite can form a porous structure in the carrier after evaporation, so as to better load more target organic substances. Methylcellulose is a water-soluble cellulose derivative that can increase the viscosity in the viscous state, make it easier to adhere, and increase the toughness of film formation.

[0068] The carrier of this embodiment includes methylcellulose, starch, and bentonite, which can not only better load the target organic substances, but also help to form a stable film-like structure.

[0069] In some embodiments of the present application, the constant gas-phase organic concentration creating device further includes a temperature control mechanism for controlling the temperature in the first inner cavity.

[0070] Based on the scientific research results of the inventors, temperature is the key factor determining the robustness of the gas-phase organic concentration creating device. Therefore, the constant gas-phase organic concentration creating device of this embodiment further includes a temperature control mechanism for controlling the temperature in the first inner cavity through the temperature control mechanism to ensure the stability of the internal temperature of the device cabin 1. The temperature control mechanism can adopt a heating system or an air-conditioning system. In order to accurately control the temperature, the temperature control mechanism is usually integrated with a temperature sensor. The sensor real-time monitors the temperature in the cabin 1 and feeds the data back to the control system for necessary adjustments. The control system automatically adjusts the output according to the preset temperature range and the data provided by the sensor to maintain the constant temperature in the cabin 1. By accurately adjusting the stability of the temperature in the first inner cavity, the robustness of the gas-phase organic concentration creating device can be significantly improved.

[0071] Please refer to Figure 1 、 Figure 2 and Figure 3 , in some embodiments of the present application, the temperature control mechanism includes a temperature control insulation barrel 4 with a second inner cavity. The temperature control insulation barrel 4 is configured to control the temperature in the second inner cavity, and the cabin 1 is disposed in the second inner cavity.

[0072] The temperature control mechanism of this embodiment adopts a temperature-controlled insulation barrel 4. The interior of the temperature-controlled insulation barrel 4 has a second inner cavity, and this space is designed to accommodate the cabin body 1 and control the temperature. The size and shape of the second inner cavity can be customized according to the size and shape of the cabin body 1 to ensure that the cabin body 1 can be fully placed therein. The temperature-controlled insulation barrel 4 controls the temperature in the second inner cavity through its built-in heating or cooling system, and these systems are automatically adjusted according to the preset temperature range or the data provided by the sensors to ensure that the cabin body 1 and the gaseous organic matter inside it are under the optimal temperature conditions. The design of the temperature-controlled insulation barrel 4 aims to provide effective thermal insulation, isolate the interference of external temperature fluctuations, and thus ensure the stability of the organic matter concentration in the device. The temperature-controlled insulation barrel 4 can also ensure that the temperature distribution in the second inner cavity is more uniform, which is crucial for the uniform distribution and concentration stability of the gaseous organic matter in the cabin body 1.

[0073] To cooperate with the temperature-controlled insulation barrel 4, the cabin body 1 can generally be designed to have relatively good heat conduction effect. For example, it can be made of metal, so that the temperature-controlled insulation barrel 4 can better regulate the temperature of the cabin body 1 located inside it.

[0074] Corresponding barrel cover 41 and fasteners 42 can be provided on the temperature-controlled insulation barrel 4. The barrel cover 41 is used to seal the temperature-controlled insulation barrel 4, reduce heat loss, and improve the stability of temperature control, while the fasteners 42 are used to fix the barrel cover 41 on the temperature-controlled insulation barrel 4. The shape of the barrel cover 41 is determined according to the temperature-controlled insulation barrel 4, and the fasteners 42 can adopt structures such as bolts and fasteners. As Figure 1 shown in the embodiment, the fasteners 42 adopt bolts. By tightly connecting the barrel cover 41 and the temperature-controlled insulation barrel 4 with the fasteners 42, the cabin cover 12 can also be pressed tightly on the cabin body main body 11, thereby improving the airtightness of the cabin body 1.

[0075] In some embodiments of the present application, the constant gaseous organic matter concentration creating device further includes a flow field generating mechanism, and the flow field generating mechanism is configured to form a flow field at the position where the source 2 is located.

[0076] Based on the scientific research results of the inventors, the flow field is the key factor determining the rapid response of the gaseous organic concentration creating device. Therefore, the constant gaseous organic matter concentration creating device of this embodiment further includes a flow field generating mechanism, and the main function of the flow field generating mechanism is to form a flow field inside the device. In particular, the flow field generating mechanism is configured to form a flow field at the position where the source 2 is located. On the one hand, the flow field can promote the rapid release of the target organic matter in the source 2, and on the other hand, it helps the target organic matter to quickly and evenly disperse it throughout the cabin body 1. The flow field generating mechanism can adopt a device that disturbs the air flow, such as rotating or flapping blades 52.

[0077] Please refer to Figure 1 、 Figure 2and Figure 3 In some embodiments of the present application, the cabin 1 includes a cabin body 11 and a cabin cover 12, the cabin body 11 is provided with a first opening connected to the first inner cavity, and the cabin cover 12 is used to close the first opening; the flow field generating mechanism includes a driving mechanism 51 and blades 52, the blades 52 are arranged in the first inner cavity, the driving mechanism 51 is arranged on the outside of the cabin cover 12, and the driving mechanism 51 and the blades 52 are transmission-connected to drive the blades 52 to form a flow field.

[0078] The cabin body 11 is the main component of the cabin body 1, which can form a first inner cavity. A first opening is provided on the cabin body 11, and the first opening is connected to the first inner cavity inside the cabin body 1, that is, the first opening is actually the opening of the first inner cavity. The hatch cover 12 is a detachable or movable component, which is used to close the first opening on the cabin body 11. When the hatch cover 12 is closed, it is tightly matched with the cabin body 11 to form a complete and closed cabin 1 space. A sealing ring 6 can also be provided between the hatch cover 12 and the cabin body 11 to ensure the sealing effect of the hatch cover 12.

[0079] In this embodiment, the flow field generating mechanism includes a driving mechanism 51 and blades 52. The driving mechanism 51 is the power source of the flow field generating mechanism and is located on the outside of the hatch 12, where the outside is the side away from the first inner cavity. This can prevent the driving mechanism 51 from contaminating the internal space of the first inner cavity and also facilitate maintenance. The driving mechanism 51 can be an electric motor, a hydraulic motor or other device that can provide rotational power. The main function of the driving mechanism 51 is to drive the blades 52 to rotate, thereby generating the required flow field.

[0080] The blade 52 is a key component of the flow field generating mechanism, which is arranged in the first inner cavity of the cabin body 11. The driving mechanism 51 and the blade 52 are connected by transmission, so that the power of the driving mechanism 51 can be transmitted to the blade 52 and drive it to rotate. The driving mechanism 51 and the blade 52 can usually adopt shaft transmission, magnetic transmission and the like. Taking shaft transmission as an example, the transmission shaft can pass through the cabin cover 12, but it is necessary to pay attention to sealing to ensure the airtightness of the first inner cavity.

[0081] According to the above device structure design, the mass conservation equation for the dynamic change of organic matter concentration on the air side of the cabin can be constructed as shown in formulas (1) and (2):

[0082]

[0083] Among them, V (m 3 ) is the volume of the cabin 1 of the device; C (μg / m 3 ) is the concentration of organic matter in the cabin, which changes with time t (h) hourly changes; Q (m3 / h) is the ventilation volume of the chamber; h m (m / h) is the convective mass transfer coefficient between the air in the chamber and the organic membrane, which determines the release rate of organic substances from the source material and is significantly affected by the air disturbance in the chamber; A (m 2 ) is the surface area of the source material in the chamber; C sur (μg / m 3 ) is the gas-phase concentration on the surface layer of the source material, which can be considered a constant over a sufficiently long time and is proportional to its dimensionless mass fraction C 0,sour in the source material. The proportionality coefficient is defined as the partition coefficient of the source material K sour (m 3 / μg).

[0084] Combining formula (1) and (2), the analytical solution of this differential equation can be obtained as shown in formula (3):

[0085]

[0086] It can be easily obtained from the analytical solution that the concentration in the chamber C is positively correlated with the content of organic substances in the source material C 0,sour . By changing the proportion of the pure liquid of the organic substance in the organic membrane of the source material, different gas-phase organic concentrations in the chamber can be directly obtained; the partition coefficient K sour of the source material in the formula changes significantly with temperature. By ensuring a constant temperature, fluctuations in this value and the concentration C in the chamber can be avoided; the mass transfer coefficient h m is directly coupled with time t . A larger h m can ensure that the term decays rapidly to 0 with time, thereby significantly reducing the C response time and achieving a rapid creation of the concentration in the chamber. Therefore, it can be seen that in the embodiment of the present application, the temperature control mechanism is used to precisely control the temperature, isolate the temperature disturbance of the external environment, and achieve high stability of the occurrence of gas-phase organic substances; the flow field generation mechanism is used to create air turbulence in the chamber to increase the mass transfer coefficient of the flow field and accelerate the release of gas-phase organic substances, so the time required to create the corresponding gas-phase organic concentration is short.

[0087] According to the above-mentioned constant gas phase organic matter concentration creating device, the present application also provides a pretreatment method, which is used for the constant gas phase organic matter concentration creating device, that is, the preparatory step of the constant gas phase organic matter concentration creating device before creating a constant gas phase organic matter concentration.

[0088] See also Figure 6 , the preprocessing methods include:

[0089] S100, preparing a viscous intermediate product, wherein the viscous intermediate product includes a carrier and a target organic matter;

[0090] S200, making a generating source 2 by using a viscous intermediate product, and placing the generating source 2 in the cabin 1.

[0091] The step of preparing a viscous intermediate product is to mix the carrier and the target organic matter to prepare a viscous intermediate product. The carrier here may be a material that can combine with the target organic matter and form a viscous state, which helps to evenly attach the target organic matter to the cabin 1. The target organic matter is a substance that needs to be released in the constant gas phase concentration creation device, and this method can ensure its uniform distribution and stable release in the device.

[0092] The prepared viscous intermediate product is further processed into a specific shape or structure to meet the requirements of being a source. This may include making the viscous material into sheets, blocks, particles, etc. For example, a mold is used to press the viscous intermediate product into a sheet source of a specific shape, which can be easily installed in the cabin 1 later. During the molding process, it is important to keep the mixed state of the target organic matter and the carrier unchanged to avoid leakage or uneven distribution of the target organic matter. The key to this step is to ensure the uniformity and integrity of the attachment so that the target organic matter can be released stably and evenly in the subsequent process of creating a constant gas phase concentration.

[0093] The prepared generator 2 is placed in the cabin 1 in a specific manner. Due to the different structures and usage requirements of the cabin 1, the installation methods are also different. For example, after the generator is manufactured, the generator can be directly coated on the inner wall of the cabin 1. For another example, if the generator is set on the base layer 21, the generator can be pasted on the inner wall of the cabin 1 through the base layer 21.

[0094] See also Figure 7 In some embodiments of the present application, the carrier includes starch, bentonite and polymethylcellulose; and the preparation of the viscous intermediate product includes:

[0095] S110, dispersing polymethyl cellulose, starch and bentonite in water, and adding target organic liquid to form a mixed liquid;

[0096] S120. Stir well under heating conditions to gradually evaporate the water in the mixed solution until it becomes viscous, forming a viscous intermediate product.

[0097] The carrier includes starch, bentonite, and methylcellulose. Starch is a natural polymer with the ability to form films. It provides the main skeletal structure in the paste and can form a film structure after drying, so it is used as the main film-forming matrix. Bentonite is a layered silicate mineral with good water absorption and dispersibility. Adding it to starch can improve the tensile strength and toughness of the film. In the viscous state, bentonite can increase viscosity and improve adhesion performance. Moreover, the water absorption and swelling characteristics of bentonite can form a porous structure in the carrier after evaporation, enabling it to better load more target organic substances. Methylcellulose is a water-soluble cellulose derivative that can increase the viscosity in the viscous state, making it easier to adhere and increasing the toughness of the film-forming.

[0098] During preparation, disperse methylcellulose, starch, and bentonite in an appropriate amount of water, and add the target organic liquid to form a mixed solution. The addition order of each component can be adjusted by yourself. However, it is more convenient to adjust the addition amount of the target organic substance by first dispersing methylcellulose, starch, and bentonite in an appropriate amount of water and then adding the target organic liquid.

[0099] Stir the mixed solution well under heating conditions. Heating helps to accelerate the evaporation of water and the uniformity of component mixing. Thorough stirring ensures that all components can come into full contact and react to form a uniform viscous substance. As heating and stirring proceed, the water in the mixed solution gradually evaporates. When the water evaporates to a certain extent, the mixed solution will become viscous, forming a viscous intermediate product, which can adhere to the inside of the cabin 1.

[0100] The emission source 2 of this embodiment is prepared by mixing the target organic substance, methylcellulose, starch, and bentonite, which can ensure the uniform distribution of the target organic substance in the carrier, so as to release the target organic substance more uniformly and orderly in a constant gas-phase organic concentration environment.

[0101] In an embodiment of the present application, the process of the pretreatment method is as follows: Disperse 0.2 grams of methylcellulose, 10 grams of starch, and 4 grams of bentonite in 20 grams of water at a temperature of 80 °C. At the same time, add 0 - 10 grams of the pure liquid of the target organic substance to the solution system, and stir well under heating conditions to gradually evaporate the water in the solution until it becomes viscous. Equipment such as a planetary ball mill and a magnetic stirrer can be used to assist stirring. Paste and cover the masking tape inside the canned cabin 1, and attach the viscous organic film to the surface of the masking tape to complete the preparation of the organic source. By adjusting the proportion of the pure liquid of the target organic substance, different concentrations of gas-phase organic atmospheres can be created.

[0102] Please refer to Figure 8 , in some embodiments of the present application, a generation source is made from a viscous intermediate product and placed in a cabin, including:

[0103] S210. Provide a base layer 21; the base layer 21 serves as the bearing foundation of the generation source, and its properties are crucial. It needs to have good flexibility to fit the inner walls of cabins of various shapes, especially the common curved inner walls. At the same time, the base layer 21 should have stable chemical properties and will not chemically react with the carrier and target organic substances in the viscous intermediate product, thus ensuring the stability of the entire generation source.

[0104] S220. Coat the viscous intermediate product on the base layer 21 to form a film-like generation source; this step is a key link in constructing the generation source. The coating operation requires uniformity and precision to ensure that the viscous intermediate product forms a film-like structure with a consistent thickness on the base layer 21. If the coating is uneven, it may lead to inconsistent speeds of the target organic substances during subsequent release, affecting the stability of the concentration of gaseous organic substances in the cabin. Coating methods can adopt various techniques, such as the doctor blade method, using a doctor blade to evenly scrape the viscous intermediate product on the surface of the base layer 21; or the spraying method, using a spray gun to evenly spray the viscous intermediate product in a mist form on the base layer 21. Through such a coating operation, the viscous intermediate product composed of the carrier and the target organic substances adheres tightly to the base layer 21, initially forming a generation source with specific structures and functions, and the film-like structure is conducive to the relatively uniform diffusion of the target organic substances during subsequent release.

[0105] S230. Cover the generation source with a film layer 22 to encapsulate the generation source; the main function of the film layer 22 is to prevent the volatilization of the target organic substances before the generation source is installed in the cabin. The film layer 22 also needs to facilitate subsequent tearing operations. The covering operation needs to ensure that the film layer 22 fits tightly with the generation source without gaps, thus forming a relatively enclosed space to firmly encapsulate the target organic substances within the structure composed of the base layer 21 and the film layer 22, maintaining the stability of the target organic substances until they are released after being placed in the cabin later.

[0106] S240. Attach the source of generation to the inner wall of the cabin through the base layer 21, and tear off the film layer 22. Before the attachment operation, it is necessary to clean and pre-treat the inner wall of the cabin to remove impurities such as dust and oil stains on the surface, so as to enhance the adhesion between the base layer 21 and the inner wall of the cabin. Then, accurately attach the base layer 21 with the source of generation to the predetermined position on the inner wall of the cabin to ensure that the source of generation is firmly installed and will not be displaced during the operation of the cabin. Once the source of generation is attached, the film layer 22 can be torn off. The timing of tearing off the film layer 22 is usually determined according to the requirements of experiments or practical applications. After tearing off, the target organic matter begins to be exposed to the inner cavity environment of the cabin. As time goes by, it gradually mass-transfers from the carrier into the gas phase space of the cabin, and begins to create a constant gas-phase organic matter concentration.

[0107] In some embodiments of the present application, in order to ensure that the source of generation is easy to handle, store and use after encapsulation. The source of generation and its encapsulation structure can be made in blocks. Specifically, before coating the viscous intermediate product on the base layer 21, a separation mold, such as a grid structure, can be set on the base layer 21. It can not only separate the coated viscous intermediate product into multiple blocks, but also play a role in controlling the coating thickness. The separation distance needs to consider the stable wrapping of the film layer 22 and subsequent cutting. After coating the viscous intermediate product on the base layer 21 and waiting for it to form a stable segmented source of generation, the separation mold can be removed, and the film layer 22 can be covered on the source of generation. After covering the film layer 22, the film layer 22 can be made to closely adhere to the source of generation and the base layer 21 by pressing with a flexible object or pumping air, etc. Finally, the film layer 22 and the base layer 21 can be cut at the separation of the source of generation to form individual encapsulated sources of generation. These encapsulated sources of generation can resist external forces such as vibration and collision during transportation, prevent the leakage of target organic matter or being polluted by the outside world, and greatly ensure the transportation safety. During storage, the stable encapsulation structure can reduce the interference of environmental factors such as humidity and temperature changes on the target organic matter and extend its effective storage period. In the usage link, the independently encapsulated source of generation is convenient to be taken as needed and can be directly installed on the inner wall of the cabin, with simple and convenient operation and no need for additional complex treatment, effectively improving the usage efficiency.

[0108] The above are only the preferred embodiments of the present application and are not intended to limit the present application. Any modifications, equivalent replacements and improvements made within the spirit and principle of the present application shall be included within the protection scope of the present application.

Claims

1. A device for creating a constant concentration of gaseous organic compounds, characterized in that, The device for creating a constant gas phase organic matter concentration comprises: A cabin having a first closable inner cavity; A generating source; the generating source is arranged in the first inner cavity; Wherein, the generating source comprises a carrier and a target organic matter, the target organic matter is mixed in the carrier, and the target organic matter is configured to be able to transfer mass into the first inner cavity; The generating source is a membrane-like structure, and the membrane-like structure is arranged in the first inner cavity. The membrane-like structure is arranged on the inner wall, top, bottom or a component specially loaded with the membrane-like structure of the cabin.

2. The constant gas-phase organic matter concentration creating device according to claim 1, wherein A protective layer is arranged on the inner wall of the cabin, and the generating source is arranged on the protective layer.

3. The constant gas-phase organic matter concentration creating device according to claim 1, characterized in that, The generating source is provided with a packaging structure for packaging the generating source; The packaging structure comprises a base layer and a coating layer, the generator is arranged on the base layer, the coating layer covers a side of the generator away from the base layer, and the coating layer is configured to be detachable from the generator; The generating source is bonded to the inner wall of the cabin through the base layer.

4. The constant gas-phase organic matter concentration creating device according to any one of claims 1-3, characterized in that, The carrier comprises at least one of starch, bentonite and polymethylcellulose; And / or, the target organic matter includes at least one of benzene, toluene, trichloroethylene, phthalate, organophosphate, and polybrominated diphenyl ether.

5. The constant gas-phase organic matter concentration creating device according to any one of claims 1-3, characterized in that, The device for creating a constant gas-phase organic matter concentration further includes a temperature control mechanism, and the temperature control mechanism is used to control the temperature in the first inner cavity.

6. The constant gas-phase organic matter concentration creating device according to claim 5, characterized in that, The temperature control mechanism comprises a temperature-controlled heat-insulating barrel having a second inner cavity. The temperature-controlled heat-insulating barrel is configured to control the temperature in the second inner cavity, and the cabin is disposed in the second inner cavity.

7. The constant gas-phase organic matter concentration creating device according to any one of claims 1 to 3, characterized in that, The device for creating a constant gas-phase organic matter concentration further includes a flow field generating mechanism, and the flow field generating mechanism is configured to form a flow field at the location of the generating source.

8. The constant gas-phase organic matter concentration creating device according to claim 7, characterized in that, The cabin body comprises a cabin body main body and a cabin cover, the cabin body main body is provided with a first opening communicating with the first inner cavity, and the cabin cover is used to close the first opening; The flow field generating mechanism comprises a driving mechanism and blades, wherein the blades are arranged in the first inner cavity, the driving mechanism is arranged on the outer side of the hatch, and the driving mechanism and the blades are transmission-connected to drive the blades to form the flow field.

9. A pretreatment method, which is used to process the constant gas-phase organic matter concentration creating device according to any one of claims 1-8, and is characterized in that, The pretreatment method comprises: preparing a viscous intermediate product, wherein the viscous intermediate product comprises the carrier and a target organic matter; The generating source is made by using the viscous intermediate product, and the generating source is placed in the cabin.

10. The pretreatment method according to claim 9, characterized in that The carrier includes polymethylcellulose, starch and bentonite; The method for preparing the viscous intermediate product comprises: Dispersing polymethylcellulose, starch and bentonite in water, and adding target organic liquid to form a mixed liquid; The mixture is stirred under heating conditions to gradually evaporate the water in the mixture to a viscous state, thereby forming the viscous intermediate product.

11. The pretreatment method according to claim 9, wherein The method of making the generating source by using the viscous intermediate product and placing the generating source in the cabin comprises: Provides a base layer; Applying the viscous intermediate product on the base layer to form the source of the film-like structure; Covering the source with a coating layer to encapsulate the source; Attach the source to the inner wall of the cabin through the base layer, and tear off the film layer.

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