Portable aerosol sampler

Abstract

The utility model relates to the technical field of aerosol samplers, in particular to a portable aerosol sampler which comprises a sampling head and a main machine, the sampling head sequentially comprises a pagoda joint, a filter paper gland, a filter paper sealing ring, filter paper, a stainless steel mesh, a middle ring, an iodine box sealing ring, an iodine box and a base from top to bottom, and a bowl-shaped protective net is arranged in the base. A controller chamber, a fan chamber and a variable-diameter flow channel are arranged in the main machine, the sampling head is communicated with the controller chamber, the controller chamber is communicated with the fan chamber, the fan chamber is communicated with the variable-diameter flow channel, and the variable-diameter flow channel is communicated with the outside. The device is simple and compact in structure and light in weight. The main machine is compact in structural layout, and sampling air can be used for cooling the interior. And the sampling head is convenient to design, mount and replace consumables. And the variable-flow channel is matched with the silencing assembly, so that the working noise is greatly reduced. In addition, the differential pressure sensor is used for replacing a flow meter which is high in price.

Description

Technical Field

[0001] This utility model relates to the field of aerosol sampler technology, specifically a portable aerosol sampler. Background Technology

[0002] Aerosol samplers are widely used in environmental monitoring and sampling of radioactive aerosols in the nuclear industry. However, current aerosol samplers suffer from the following problems: 1. The main unit is large and inconvenient to carry and install due to the need for good heat dissipation; 2. The sampling head structure is poorly designed, making it inconvenient to replace consumables such as filter paper and iodine boxes. Furthermore, the use of threaded connections for clamping the filter paper can cause the filter paper sealing ring to rotate during tightening, resulting in uneven and crumpled filter paper. In contrast, some samplers use snap-fit ​​connections, such as the one disclosed in Chinese Utility Model Patent CN212031060U, which uses an external clamping device for simultaneous collection of radioactive aerosols and gaseous iodine, resulting in a complex, large, and unattractive structure; 3. They are noisy during operation.

[0003] Therefore, designing an aerosol sampler that is compact, easy to replace consumables, and has low noise has a promising market prospect. Utility Model Content

[0004] To address the shortcomings of the existing technology, this utility model provides a portable aerosol sampler with a reasonable layout, compact structure, and low noise.

[0005] The technical solution adopted by this utility model to solve its technical problem is:

[0006] A portable aerosol sampler includes a sampling head and a main unit. The sampling head, from top to bottom, includes a pagoda connector, a filter paper cap, a filter paper sealing ring, filter paper, a stainless steel mesh, a middle ring, an iodine box sealing ring, an iodine box, and a base. A bowl-shaped protective mesh is installed inside the base. The main unit has a controller chamber, a fan chamber, and a variable-diameter flow channel inside. The sampling head is connected to the controller chamber, the controller chamber is connected to the fan chamber, the fan chamber is connected to the variable-diameter flow channel, and the variable-diameter flow channel is connected to the outside.

[0007] Furthermore, it also includes a noise reduction assembly, wherein the variable diameter flow channel is connected to the external noise reduction assembly.

[0008] Furthermore, the noise reduction assembly includes a fastening bottom cover, a core tube, a sleeve tube, and a connector. The core tube has a central through hole and several chambers communicating with the central through hole.

[0009] Furthermore, the diameter of the core is smaller than the inner diameter of the sleeve.

[0010] Furthermore, the upper and lower surfaces of the tube are provided with several grooves.

[0011] Furthermore, the variable diameter flow channel includes a throttling orifice located in the middle of the variable diameter flow channel.

[0012] Furthermore, a tracheal connector is connected to each side of the throttling orifice, and the two tracheal connectors are connected to the differential pressure sensor.

[0013] Preferably, the middle ring is connected to the base by a thread.

[0014] Preferably, the middle ring and the filter paper cap are connected by threads, and the filter paper sealing ring includes a lower pressure ring and a horizontal ring extending outward horizontally above the pressure ring. A limiting part is provided between the outer side of the pressure ring and the inner side of the middle ring.

[0015] Furthermore, the limiting part includes a limiting protrusion and a corresponding limiting groove.

[0016] The beneficial effects of this utility model are:

[0017] It features a simple and compact structure, is lightweight, and is only one-third the size of common similar products. The main unit's layout is not only compact but also utilizes sampled air to cool the internal control circuit board, power supply, and fan. The sampling head is designed for easy installation and replacement of consumables. The variable-diameter flow channel, combined with a noise reduction component, significantly reduces operating noise. Furthermore, differential pressure sensors are connected to both sides of the variable-diameter flow channel via air pipe connectors, enabling flow rate calculation without the need for expensive flow meters. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the exploded structure of this utility model;

[0019] Figure 2 This is a cross-sectional structural diagram of the present invention;

[0020] Figure 3 A schematic diagram of the structure of this utility model showing the setting of a limiting part between the filter paper sealing ring and the middle ring;

[0021] Figure 4 This is a cross-sectional view of the noise reduction component of this utility model;

[0022] Figure 5 This is a schematic diagram of the core structure of this utility model;

[0023] Figure 6 for Figure 3 Enlarged diagram of section A in the middle;

[0024] In the diagram, the components are: sampling head 1, pagoda connector 101, filter paper cap 102, filter paper sealing ring 103, pressure ring 1031, horizontal ring 1032, limiting protrusion 1033, filter paper 104, stainless steel mesh 105, middle ring 106, limiting groove 1061, iodine box sealing ring 107, iodine box 108, base 109, bowl-shaped protective net 110, main unit 2, controller room 201, fan room 202, variable diameter flow channel 203, throttling orifice 2031, air pipe connector 2032, silencer assembly 3, fastening bottom cover 301, tube core 302, central through hole 3021, chamber 3022, groove 3023, tube sleeve 303, connector 304, sealing cap 4, and pagoda connector II 5. Detailed Implementation

[0025] To better understand this utility model, the following will be combined with Figures 1-6 The technical solutions in the embodiments of this utility model are clearly and completely described herein. Obviously, the described embodiments are only some embodiments of this utility model, and not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

[0026] Example 1:

[0027] In this embodiment, the portable aerosol sampler includes a sampling head 1 and a main unit 2. The sampling head, from top to bottom, includes a pagoda connector 101, a filter paper cap 102, a filter paper sealing ring 103, filter paper 104, a stainless steel mesh 105, a middle ring 106, an iodine box sealing ring 107, an iodine box 108, and a base 109. A bowl-shaped protective mesh 110 is installed inside the base 109. The pagoda connector 101 is connected to the filter paper cap 102 by threads. An annular step is provided on the inner side of the upper end of the middle ring 106 for placing the stainless steel mesh 105. The stainless steel mesh 105 includes an outermost ring and a mesh fixed inside the ring. The diameter of the ring is equal to or slightly smaller than the diameter of the annular step. An annular step II is provided on the inner side of the lower end of the middle ring 106 to press down the iodine box sealing ring 107 and the iodine box 108. A chamber for holding the iodine box 108 is provided at the upper end of the base 109, and a sealing ring is provided at the bottom of the chamber. The base 109 is connected to the main unit 2 by threads, and a sealing ring is also provided between them. The bowl-shaped protective net 110 is located at the bottom of the base 109. The middle ring 106 can be connected to the base 109 and the filter paper cover 102 by threads, snaps, etc. In this embodiment, preferably, the middle ring 106 is connected to the base 109 and the filter paper cover 102 by threads. After the middle ring 106 is threadedly connected to the filter paper cap 102, when the filter paper cap 102 is installed and screwed on, the filter paper cap 102 contacts the filter paper sealing ring 103. Friction causes the filter paper sealing ring 103 to rotate, which may cause the filter paper 104 to be crumpled, resulting in unevenness or even misalignment. Therefore, the following limiting part is designed to prevent the filter paper 104 from being crumpled: The filter paper sealing ring 103 includes a lower pressure ring 1031 and a horizontal ring 1032 extending outward horizontally above the pressure ring 1031. A limiting part is provided between the outer surface of the pressure ring 1031 and the inner surface of the middle ring 106. Preferably, the limiting part includes one or two limiting protrusions 1033 symmetrically arranged on the outer surface of the pressure ring 1031, and a limiting groove 1061 corresponding to the limiting protrusions 1033 arranged on the inner surface of the middle ring 106.

[0028] like Figure 2As shown, the main unit 2 internally includes a controller chamber 201, a fan chamber 202, and a variable-diameter flow channel 203. The sampling head 1 is connected to the controller chamber 201, which in turn is connected to the fan chamber 202. The fan chamber 202 is connected to the variable-diameter flow channel 203, which is connected to the outside. When the fan in the fan chamber 202 operates, it draws in external air from the sampling head 1, which then passes through the controller chamber 201, the fan chamber 202, and the variable-diameter flow channel 203 before being discharged to the outside of the main unit 2. This layout allows for a compact internal structure, thus reducing the main unit's size. The variable-diameter flow channel 203 includes a throttling orifice 2031 located in the middle of the channel, the diameter of which is smaller than the diameters of the channels on either side. The electrical components, various connectors, front and rear covers, sealing gaskets, and display screens inside the main unit 2, which are shown in the figures but not described, are all prior art and will not be elaborated upon here.

[0029] Example 2:

[0030] To further reduce noise, this embodiment, based on Embodiment 1, designs a noise-reducing component 3. Specifically, the variable-diameter flow channel 203 is connected to the external noise-reducing component 3 via a plug-in or threaded connection, and the variable-diameter flow channel 203 communicates with the noise-reducing component 3. As a preferred embodiment of the noise-reducing component 3, the noise-reducing component 3 includes a fastening bottom cover 301, a core 302, a sleeve 303, and a connector 304. The core 302 is provided with a central through hole 3021 and several chambers 3022 communicating with the central through hole 3021. The chambers 3022 can be designed as follows: Figure 5 The V-shaped chamber shown is connected to the outside; however, the chamber may not be connected to the outside (i.e., both sides of the chamber are closed). The connector 304 is a threaded connection end, connecting to the internal threaded hole at the end of the variable diameter flow channel 203. An isolation mesh is installed at the end of the variable diameter flow channel 203 to prevent the entry of external foreign objects. After removing the silencing assembly 3, the variable diameter flow channel 203 can be sealed using the included sealing cap 4. After the core 302 is inserted into the sleeve 303, the two are fixed together with screws. The end of the core 302 has a threaded end, and the fastening cap 301 is screwed onto the threaded end of the core 302. Figure 2 and Figure 4 As shown, a pagoda connector II5 is detachably connected to the end of the variable diameter flow channel 203. The end of the pagoda connector II5 is provided with an internal threaded hole, and the connector 304 is connected to the end of the pagoda connector II5. After removing the pagoda connector II5, the variable diameter flow channel 203 is sealed with a sealing cap 4.

[0031] To improve the noise reduction effect, the diameter of the core 302 is smaller than the inner diameter of the sleeve 303. Furthermore, several grooves 3023 are provided on the upper and lower surfaces of the core 302. In this embodiment, to fix the core 302, fixing rings with a diameter equal to or slightly smaller than the inner diameter of the sleeve 303 are provided at both ends of the core 302, and the sleeve 303 and the fixing rings are fixedly connected by screws. The chamber 3022 adopts... Figure 5 The V-shaped chamber shown is connected to the outside, and sound waves can enter the gap between the sleeve 303 and the core 302 from the chamber 3022 for further attenuation.

[0032] Example 3:

[0033] In the above embodiment one or two, the existing flow meter can be used to measure the sampled flow rate. To reduce costs, this embodiment can replace the flow meter in embodiment one or two with the following structure:

[0034] A duct connector 2032 is connected to each side of the throttling orifice 2031. The two duct connectors 2032 are connected to the differential pressure sensor. According to Bernoulli's principle, which states that a high flow velocity results in a low pressure and a low flow velocity results in a high pressure, the gas filling the flow channel flows through the throttling orifice in the pipe and causes local contraction near the throttling orifice, increasing the flow velocity. This generates a static pressure difference between the upstream and downstream sides of the throttling orifice, and the flow rate is calculated from the differential pressure of the differential pressure sensor.

[0035] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this application, and are not intended to limit them. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this application.

Claims

1. A portable aerosol sampler, comprising a sampling head and a main unit, characterized in that: The sampling head, from top to bottom, includes a pagoda connector, a filter paper cap, a filter paper sealing ring, filter paper, a stainless steel mesh, a middle ring, an iodine box sealing ring, an iodine box, and a base. A bowl-shaped protective mesh is installed inside the base. The main unit has a controller room, a fan room, and a variable diameter flow channel. The sampling head is connected to the controller room, the controller room is connected to the fan room, the fan room is connected to the variable diameter flow channel, and the variable diameter flow channel is connected to the outside.

2. The portable aerosol sampler as described in claim 1, characterized in that: It also includes a noise reduction assembly, wherein the variable diameter flow channel is connected to the external noise reduction assembly.

3. A portable aerosol sampler as described in claim 2, characterized in that: The noise reduction assembly includes a fastening bottom cover, a core tube, a sleeve tube, and a connector. The core tube has a central through hole and several chambers communicating with the central through hole.

4. A portable aerosol sampler as described in claim 3, characterized in that: The diameter of the core tube is smaller than the inner diameter of the sleeve tube.

5. A portable aerosol sampler as described in claim 4, characterized in that: The upper and lower surfaces of the tube core are provided with several grooves.

6. A portable aerosol sampler as described in claim 1, characterized in that: The variable diameter flow channel includes a throttling orifice located in the middle of the variable diameter flow channel.

7. A portable aerosol sampler as described in claim 6, characterized in that: A tracheal connector is connected to each side of the throttling orifice, and the two tracheal connectors are connected to the differential pressure sensor.

8. A portable aerosol sampler as described in claim 1, characterized in that: The middle ring is connected to the base by threads.

9. A portable aerosol sampler as described in claim 1, characterized in that: The middle ring and the filter paper cap are connected by threads. The filter paper sealing ring includes a lower pressure ring and a horizontal ring extending outward horizontally above the pressure ring. A limiting part is provided between the outer side of the pressure ring and the inner side of the middle ring.

10. A portable aerosol sampler as described in claim 9, characterized in that: The limiting part includes a limiting protrusion and a corresponding limiting groove.

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