A gas-iodine combined sampling instrument

Abstract

This utility model relates to a combined gaseous-iodine sampling instrument, including a combined housing; the combined housing includes an upper chamber and a lower chamber; filter paper is installed in the upper chamber for filtering aerosols; a first air extraction mechanism is installed in the lower chamber; an iodine collection chamber is provided at the top of the lower chamber, and the iodine collection chamber is connected to the upper chamber, thus forming a bypass structure; an iodine collector is provided in the iodine collection chamber, and a second air extraction mechanism is provided at the bottom of the iodine collection chamber. The second air extraction mechanism diverts outside air after passing through the filter paper and flows through the iodine collector; when outside air is driven into the upper chamber by the first air extraction mechanism and passes through the filter paper, if only aerosol sampling is required, the second air extraction mechanism does not need to be activated, and the air goes directly to the first air extraction mechanism; if iodine sampling is required simultaneously, the second air extraction mechanism is activated simultaneously, diverting the air that has been filtered for aerosols to an independent iodine collection chamber for gaseous iodine collection. The beneficial effects achieved by this utility model are: accurate data acquisition and flexible gaseous-iodine sampling.

Description

Technical Field

[0001] This utility model relates to the field of radioactive detection technology, and in particular to a gaseous iodine combined sampling instrument. Background Technology

[0002] With the rapid development of the national nuclear power industry, more and more nuclear power plants are being built. For many fields, including nuclear energy facility operation, nuclear accident emergency response, and nuclear medicine applications, environmental radioactivity monitoring is essential to better protect the environment and the public, and to assess the impact of nuclear power plants on the environment and surrounding residents. This means that rapid and accurate sampling and monitoring of radioactive iodine in the air (especially volatile organic iodine, such as methyl iodine, and inorganic iodine aerosols) is crucial. Therefore, it is frequently necessary to sample the atmosphere in the natural environment or surrounding area to analyze and detect the activity of radioactive aerosols and gaseous iodine. Currently, the common approach for detecting iodine and aerosols in the air is to sample iodine and aerosols separately. Typically, activated carbon boxes or cartridges containing special impregnating agents (such as TEDA-impregnated activated carbon) are used to sample gaseous iodine, which is adsorbed and retained by the activated carbon as air flows through it. For aerosol sampling, filtration is usually used, where larger aerosol particles are physically blocked after the air passes through a filter membrane or filter paper.

[0003] However, this separation sampling method has some problems in practical applications: the current device generates some noise during sampling, which interferes with the normal working environment; and since the two sets of devices are independent, it is difficult to ensure the synchronization and complete consistency of each parameter, which means that the final obtained gaseous iodine concentration and aerosol solubility cannot represent air samples at the same time and space point, which will introduce uncertainty into the data correlation analysis and the accurate assessment of the total radioactive iodine concentration. In addition, the existing device is relatively troublesome and not simple to replace the filter paper or activated carbon box.

[0004] Therefore, based on customer feedback regarding the shortcomings of the existing device, the inventors made further improvements to overcome the aforementioned problems. Utility Model Content

[0005] The purpose of this invention is to overcome the shortcomings of the prior art and provide a gas-iodine combined sampling instrument that can acquire accurate data, reduce the impact of noise, and provide flexible gas-iodine sampling.

[0006] The objective of this utility model is achieved through the following technical solution: a gas-iodine combined sampling instrument, including a combined housing;

[0007] The combined housing includes an upper cavity and a lower cavity; the upper cavity is equipped with filter paper for filtering aerosols; a first air extraction mechanism is provided in the lower cavity connected to the upper cavity; an iodine extraction chamber is provided at the top of the lower cavity and is connected to the upper cavity to form a bypass structure; an iodine collector is provided inside the iodine extraction chamber, and a second air extraction mechanism is provided at the bottom of the iodine extraction chamber, which causes outside air to be diverted after passing through the filter paper and enter the iodine extraction chamber and flow through the iodine collector;

[0008] When outside air is drawn into the upper chamber by the main air extraction mechanism and passes through the filter paper to trap aerosols, if only aerosol sampling is required, the second air extraction mechanism does not need to be activated, and the air directly enters the lower chamber to the first air extraction mechanism. If iodine needs to be sampled simultaneously, the second air extraction mechanism is activated simultaneously to divert the air that has been filtered of aerosols to a separate iodine collection chamber for the collection of gaseous iodine.

[0009] As a preferred technical solution of this application, the second gas extraction mechanism is provided with a tail pipe, and a flow monitor B for detecting the flow rate of gas entering the iodine extraction chamber is detachably inserted into the tail pipe.

[0010] As a preferred technical solution of this application, the combined housing is connected to the outside via a tube, and a flow monitor A is detachably inserted in the tube, which can detect the total intake air flow.

[0011] As a preferred technical solution of this application, the inner surface of the lower cavity is also covered with a noise reduction layer, and the noise reduction layer has a multi-layer structure, which consists of a sound insulation layer and a sound absorption layer from the outside to the inside. The sound insulation layer includes two damping plates and a layer of sound-absorbing cotton, while the sound absorption layer is composed of an aluminum plate, sound-absorbing cotton and a perforated plate connected in sequence.

[0012] As a preferred technical solution of this application, both damping plates in the sound insulation layer are made of damping rubber material.

[0013] As a preferred technical solution of this application, the joints of the materials in the noise reduction layer are sealed with sealant to prevent sound leakage.

[0014] As a preferred technical solution of this application, the main materials of the sound-absorbing cotton in the sound insulation layer are polyurethane and polystyrene.

[0015] As a preferred technical solution of this application, the first pumping mechanism and the second pumping mechanism are both vacuum pump bodies. The pump body is powered by a motor to control the two rotors to rotate synchronously in opposite directions, thereby forming a compression space and pushing the gas from the inlet to the outlet.

[0016] When only sampling aerosol is used, the second extraction mechanism is turned off, and all airflow does not enter the iodine extraction chamber. When the motors in the first and second extraction mechanisms are turned on at the same time, the airflow is split into two paths according to the set ratio.

[0017] This utility model has the following advantages:

[0018] (1) The data acquisition is accurate and the gaseous iodine is sampled flexibly;

[0019] Because it is impossible to accurately guarantee the consistency of sampling flow rate when sampling iodine and aerosol in the same area simultaneously using independent devices, the sampling results are not highly certain. This solution combines gaseous iodine sampling by designing a vertically connected cavity for aerosol sampling and a bypass iodine collection chamber for iodine capture. Iodine collection in the iodine collection chamber is controlled by a second air extraction mechanism, while aerosol sampling is controlled by a first air extraction mechanism. This allows for flexible selection of "aerosol only" or "simultaneous aerosol + gaseous iodine sampling" in a single sampling. Furthermore, the airflow used for iodine collection is diverted from the airflow after aerosol sampling, resulting in more accurate data that more accurately reflects the concentration of gaseous iodine.

[0020] (2) Avoid interference during gaseous iodine sampling and reduce noise impact;

[0021] Currently, there are some devices that combine gaseous and iodine sampling, but these devices can interfere with each other during synchronous sampling, and the overall size of the device is larger and generates more noise. This solution uses a bypass iodine extraction chamber and a dual air extraction mechanism to coordinate and control the air entering the device. After aerosol sampling, the air is diverted into two paths: one directly enters the lower chamber, and the other enters the iodine extraction chamber to extract iodine. This synchronous sampling ensures that gaseous iodine sampling does not affect the aerosol collection efficiency, and the iodine sampling airflow is free from particulate matter interference, resulting in more accurate data. The lower chamber of this solution has a noise reduction layer on its inner wall to absorb the noise generated by the motor and airflow inside the device. This solution shares the air inlet, outer shell, and main pump (A), and only adds a small power pump (B) and a small chamber, making it lower in cost and smaller in size than two independent systems. Attached Figure Description

[0022] Figure 1 This is a first-view structural schematic diagram of the present invention;

[0023] Figure 2 This is a structural schematic diagram of the present invention from a second perspective;

[0024] Figure 3 This is a structural schematic diagram of the present invention from a frontal cross-sectional view.

[0025] Figure 4This is a structural schematic diagram of the present invention from a side cross-sectional view.

[0026] Figure 5 This is a schematic diagram of the structure of the lower cavity noise reduction layer of this utility model;

[0027] In the diagram: 1-Upper cavity, 2-Lower cavity, 3-Filter paper, 4-First suction mechanism, 5-Second suction mechanism, 6-Iodine extraction cavity, 7-Tube, 8-Flow meter A, 9-Sound insulation layer, 10-Sound absorption layer. Detailed Implementation

[0028] The present invention will be further described below with reference to the accompanying drawings, but the scope of protection of the present invention is not limited to the following description.

[0029] It should be noted that the orientation or positional relationship indicated by terms such as "left" and "right" is based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship that the product of this invention is usually placed in during use, or the orientation or positional relationship that is commonly understood by those skilled in the art. Such terms are only for the convenience of describing this utility model and simplifying the description, and are not intended to 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.

[0030] It should be noted that, unless otherwise specified, the embodiments and features and technical solutions in the present invention can be combined with each other.

[0031] Therefore, based on the above issues, please refer to Figure 1 This utility model proposes a gas-iodine combined sampling instrument to solve the problem.

[0032] (Example 1)

[0033] See Figures 1-5 The gas-iodine combined sampling instrument proposed in this embodiment includes a combined housing and an upper cavity 1 and a lower cavity 2 opened in the housing;

[0034] Among them, see Figure 1 and Figure 3 The combined chamber is mainly divided into an upper chamber 1 and a lower chamber 2. A filter paper 3 is adaptedly installed in the upper chamber 1. It is a special filter paper 3 that filters and traps aerosols. A first air extraction mechanism 4 is provided in the lower chamber 2. The first air extraction mechanism 4 is connected to the lower part of the upper chamber 1. By activating the first air extraction mechanism 4, the first air extraction mechanism 4 draws outside air from the top of the upper chamber 1 into the chamber from top to bottom, and passes through the filter paper 3 (where the aerosols are trapped).

[0035] Among them, see Figure 2 and Figure 4An iodine collection chamber 6 is provided at the upper part of the lower chamber 2. An iodine collector is installed in the iodine collection chamber 6 to collect gaseous iodine in the air. The iodine collection chamber 6 is the same as the lower chamber 2, and is also connected to the upper chamber 1. The iodine collection chamber 6 is a bypass structure. A second air extraction structure is provided at the bottom of the iodine collection chamber 6. When the second air extraction structure is activated, the airflow through the filter paper 3 can enter the iodine collection chamber 6 and flow through the iodine collector.

[0036] If only aerosol sampling is required, the first extraction mechanism 4 mainly extracts the airflow and drives the air into the upper chamber 1, where it passes through the filter paper 3 to trap the aerosol. There is no need to activate the second extraction mechanism 5; the air directly enters the lower chamber 2 and flows to the first extraction mechanism 4. If iodine sampling is required simultaneously, the second extraction mechanism 5 is activated simultaneously to divert the filtered aerosol air to a separate iodine collection chamber 6 for the collection of gaseous iodine.

[0037] It should be noted that current sampling methods for gaseous iodine and aerosols typically use two independent devices. Therefore, during sampling, because each device has its own flow meter, pump, and control unit, it is difficult to guarantee consistency in key parameters such as sampling flow rate. Consequently, the obtained gaseous iodine concentration and iodine aerosol concentration cannot be accurately used as air samples from the same time and location, increasing the uncertainty of the overall sampling results. Furthermore, it cannot effectively prevent media blockage. Therefore, this solution designs a combined gaseous-iodine sampling method. The sampling instrument, through the design of a bypass iodine collection chamber 6, allows for flexible selection of "aerosol only" or "simultaneous aerosol + gaseous iodine collection" during a single sampling. Furthermore, a diversion point is set downstream of the aerosol filter paper 3, which can separate the airflow that has already been filtered out of aerosol on the filter paper 3 into an independent iodine collection chamber 6. This ensures that there are no particulate matter in the airflow entering the iodine collector, and can completely avoid clogging of the adsorption medium. At the same time, the airflow for iodine collection in the iodine collection chamber 6 comes from the airflow after passing through the aerosol filter paper 3, which can more accurately reflect the concentration of gaseous iodine.

[0038] In this embodiment, see Figures 1-4For the combined housing; the combined housing consists of housing A and housing B, each with an upper cavity 1 and a lower cavity 2, which are attached and fixed together vertically, with the bottom of housing A connected to the top of housing B. The overall size of housing A is smaller than that of housing B. Housing A has a structure that can be opened and closed vertically and is divided into a top cover A and a housing body A. The top cover is hinged to one side of the first housing body and fastened with a buckle. At the same time, a filter paper 3 for aerosol filtration is detachably installed in the upper cavity 1 of housing A, and the space below the filter paper 3 is connected to the lower cavity 2. Housing B is also divided into a top cover B and a housing body B. The top cover B and the housing body B are fastened together by a buckle structure to form a structure that can be opened and closed vertically (housing body A). The bottom surface is attached to and connected to the top of the upper cover B. When the upper cover B is opened upwards, the entire box A moves accordingly. A first air extraction mechanism 4 is set in the lower cavity 2. The airflow enters the upper cavity 1 from the outside through the first air extraction mechanism 4 and flows through the filter paper 3 before reaching the first air extraction mechanism 4. The first air extraction mechanism 4 discharges the airflow that has trapped aerosols out of the outlet. At the same time, an iodine extraction cavity 6 is set in the upper part of the lower cavity 2. The iodine extraction cavity 6 serves as a bypass structure to the upper cavity 1 and is connected to the upper cavity 1. A second air extraction mechanism 5 is installed in the iodine extraction cavity 6. The second air extraction mechanism 5 allows the airflow that has trapped aerosols to enter the iodine extraction cavity 6 and collect gaseous iodine through the iodine collector.

[0039] Furthermore, a tube 7 extends laterally from the lower side of the combined housing B. The tube 7 is a circular tube channel that is connected to the outside. An installation hole is opened on the inner wall of the through side. The flow monitor A can be fitted with its probe inserted into the tube 7 through the installation hole to monitor the total air intake flow. The airflow drawn into the upper cavity 1 from the outer diameter by the first suction mechanism 4 is the total air intake flow. Regardless of whether the airflow is diverted to extract iodine by the second suction mechanism 5 in the device, the airflow will eventually be discharged through the tube 7. Therefore, the flow monitor A is inserted into the tube 7 to monitor the total flow.

[0040] Furthermore, a tail pipe is provided at the position where the outlet of the second air extraction mechanism 5 connects with the lower cavity 2. A flow monitor B is detachably inserted into the wall of the tail pipe. The flow monitor B only monitors the portion of the airflow that is diverted into the iodine extraction cavity 6 for gaseous iodine collection. Therefore, the flow rate entering the iodine extraction cavity 6 and the total air intake flow rate can be monitored by the flow monitor B and the flow monitor A, respectively, and thus used to calculate the gaseous iodine concentration and the aerosol concentration.

[0041] In this embodiment, see Figures 3-5It also includes a noise reduction layer; the noise reduction layer covers the inner surface of box B and includes a multi-layer structure, which is divided into a sound insulation layer 9 and a sound absorption layer 10 from the outside to the inside. The sound absorption layer 10 directly absorbs the noise generated inside the device, while the sound insulation layer 9 further prevents the sound from being transmitted to the outside. The sound insulation layer 9 consists of a damping plate, a sandwich of sound-absorbing cotton, and another damping plate. The damping plate is made of damping rubber material. The sound absorption layer 10 consists of an aluminum plate, sound-absorbing cotton, and a perforated plate connected in sequence. The sound-absorbing cotton layer is made of polyurethane and polystyrene material. All layers of this noise reduction layer are sealed at the joints with sealant to prevent sound leakage.

[0042] It should be noted that this scheme uses a vortex vacuum pump as the first pumping mechanism 4 and the second pumping mechanism 5, and both moving parts are driven by brushless DC motors, while the control unit adopts a frequency converter and PID control, which are all existing technologies; the motor drives the two rotors in the vacuum pump body to rotate synchronously in opposite directions, thereby forming a compression space and pushing the gas from the inlet to the outlet.

[0043] Furthermore, this solution employs HEPA filters for aerosol collection. HEPA filters are an existing technology that can capture aerosol particles with a diameter of 0.3 micrometers or larger, which is very effective for aerosols containing radioactive materials. HEPA filters are typically made of multilayer glass fibers or other microporous materials, ensuring efficient aerosol capture in a nuclear radiation environment.

[0044] (Example 2)

[0045] Based on the gas-iodine combined sampling instrument in Example 1 above, the aerosol filter paper 3 is prepared by a wet process and uniformly mixing glass microfiber cotton, organic fiber and alkali-free glass fiber chopped strands in a certain proportion. The resulting filter paper 3 has obvious radiation resistance and is suitable for aerosol sampling in this scheme. The filter paper 3 can remain stable under γ-ray irradiation and is suitable for nuclear-grade HEPA filters. In humid environments, the filter paper 3 can effectively enhance the aerosol collection efficiency and the adaptability of the filter.

[0046] (Example 3)

[0047] Based on the gas-iodine combined sampling instrument in Embodiment 1 above, an enrichment device is also included. Since the capture of aerosols in the gas flow may not be accurate enough when using filter paper 3 to intercept them, an enrichment device is used to achieve phase change capture of aerosols through the deep cooling function of the condenser: firstly, the temperature in the upper cavity 1 is reduced by the condenser (refrigeration unit), thereby condensing or freezing aerosol particles on the surface of filter paper 3, and finally achieving the enrichment and separation of aerosols, effectively capturing vapor or submicron-sized radioactive aerosols.

[0048] Currently, due to the need for environmental radioactivity monitoring, it is necessary to sample and analyze radioactive aerosols and gaseous iodine in the environment. However, current methods typically use independent equipment for separate sampling. This approach suffers from the problem of inconsistent sampling data due to the independent nature of the devices; the obtained gaseous iodine concentration and iodine aerosol concentration cannot be accurately used as air samples taken at the same time and location. Furthermore, existing devices are prone to clogging by other small particles when sampling iodine separately and generate significant noise. Therefore, the combined gaseous-iodine sampling instrument proposed in this solution utilizes a bypass design on the side of the aerosol sampling chamber. The iodine collection chamber 6 allows for flexible selection of aerosol sampling or simultaneous sampling of aerosol and gaseous iodine via independently designed first and second extraction mechanisms 5 during air sampling. This makes the sampling method simpler, more convenient, and yields more accurate data. Furthermore, the iodine diversion point for gaseous iodine collection is located below the aerosol filter paper 3, ensuring that the airflow entering the iodine collector is free of particulate matter and completely preventing blockage by the adsorption medium. This design also includes a noise reduction layer that absorbs and isolates internal noise after the device is snapped shut, preventing interference with the working environment.

[0049] 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 spirit and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. A gas-iodine combination sampling instrument, characterized by: Including the combined enclosure; The combined housing includes an upper chamber (1) and a lower chamber (2); a filter paper (3) is installed in the upper chamber (1) for filtering aerosols; a first air extraction mechanism (4) is provided in the lower chamber (2) connected to the upper chamber (1); an iodine extraction chamber (6) is provided at the upper part of the lower chamber (2), and the iodine extraction chamber (6) is connected to the upper chamber (1) to form a bypass structure; an iodine collector is provided inside the iodine extraction chamber (6), and a second air extraction mechanism (5) is provided at the bottom of the iodine extraction chamber (6). The second air extraction mechanism (5) causes the outside air to be diverted after passing through the filter paper (3) and enter the iodine extraction chamber (6) and flow through the iodine collector; When outside air is drawn by the first extraction mechanism (4) and driven into the upper chamber (1) and the aerosol is intercepted by the filter paper (3), if only the aerosol needs to be sampled, the second extraction mechanism (5) does not need to be started and the air directly enters the lower chamber (2) to the first extraction mechanism (4); if iodine needs to be sampled at the same time, the second extraction mechanism (5) is started at the same time to divert the air that has been filtered of aerosol to the independent iodine collection chamber (6) for the collection of gaseous iodine.

2. The gas-iodine combined sampling instrument according to claim 1, characterized in that: The second air extraction mechanism (5) is provided with a tail pipe, and a flow monitor B for detecting the flow rate of gas entering the iodine extraction chamber (6) is detachably inserted into its tail pipe.

3. The gas-iodine combined sampling instrument according to claim 1, characterized in that: The combined housing is connected to the outside via a tube (7), and a flow monitor A is detachably inserted in the tube (7), which can detect the total intake flow rate.

4. The gas-iodine combined sampling instrument according to claim 1, characterized in that: The inner surface of the lower cavity (2) is also covered with a noise reduction layer, which is a multi-layer structure. From the outside to the inside, it consists of a sound insulation layer (9) and a sound absorption layer (10). The sound insulation layer (9) includes two damping plates and a sandwich of sound-absorbing cotton, while the sound absorption layer (10) is made of an aluminum plate, sound-absorbing cotton and a perforated plate connected in sequence.

5. A gas-iodine combined sampling instrument according to claim 4, characterized in that: Both damping plates in the sound insulation layer (9) are made of damping rubber material.

6. The gas-iodine combined sampling instrument according to claim 4, characterized in that: The joints between the materials in the noise reduction layer are sealed with sealant to prevent sound leakage.

7. A gas-iodine combined sampling instrument according to claim 5, characterized in that: The main materials of the sound-absorbing cotton in the sound insulation layer (9) are polyurethane and polystyrene.

8. The gas-iodine combined sampling instrument according to claim 1, characterized in that: The first pumping mechanism (4) and the second pumping mechanism (5) are both vacuum pumps. The pump body is powered by a motor to control the two rotors to rotate synchronously in opposite directions, thereby forming a compression space and pushing the gas from the inlet to the outlet. When only sampling aerosol is used, the second extraction mechanism (5) is closed, and all airflow does not enter the iodine extraction chamber (6). When the motors in the first extraction mechanism (4) and the second extraction mechanism (5) are turned on at the same time, the airflow is split into two paths according to the set ratio.

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