Individual respiration sampling device for particulate matters in air in workplace

Abstract

The utility model provides an individual respiration sampling device for particulate matters in air in a workplace. The individual respiration sampling device comprises a sampling mask body and an exhaled air sampling assembly, air inlets are formed in the two sides of the sampling mask body, and filter membranes are arranged at the air inlets; a mask air outlet is formed in the center or the lower portion of the surface of the sampling mask body, and the mask air outlet is connected with the exhaled air sampling assembly. The exhaled gas sampling assembly comprises a mask connecting sleeve, an L-shaped mask tube, a quick connecting tube and a color-changing sampling diaphragm assembly; the individual respiration sampling device has the technical advantages of high measurement and calculation accuracy, convenience in disassembly, repeated use and the like.

Description

Technical Field

[0001] The utility model relates to the field of sampling devices, in particular to an individual breathing sampling device for particulate matter in the air of a workplace. Background Art

[0002] Individual breath sampling devices are often referred to as personal air samplers or personal respirators. These devices are designed to assess the concentration of particulate matter in workplace air to determine if there is a potential air pollution problem.

[0003] Personal air samplers generally consist of the following main components: Sampling hood: This is the part that comes into contact with the personal breathing area, usually worn on the worker's body, and sometimes worn on the head. The sampling hood should be able to capture air particles emitted from the worker's breathing area. Filter membrane: This is a filtering structure located in the sampling hood, used to capture particles in the air. The selection of the filter membrane should be based on the type of particles and the purpose of sampling. Flow meter: used to monitor the sampling flow. When using a personal air sampler, the worker wears the sampling hood on his body; after sampling, the filter membrane will be removed and sent to the laboratory for analysis and calculation of the particle concentration. The usual calculation method is to use the mass difference before and after the filter membrane divided by the flow rate of the flowmeter to get the particle concentration;

[0004] However, the researchers found that the ability of the filter membrane at the air inlet to collect particulate matter would decrease under conditions of long-term use with high concentrations of particulate matter. This deterioration in collection capacity rather than a decrease in actual on-site particle concentration would affect the measurement accuracy (however, it is not reasonable to regularly replace the filter membrane based on the length of time). Therefore, the researchers designed a color-changing sampling membrane to be installed at the outlet to assist in understanding the particle concentration. However, how to ensure that the color-changing sampling membrane of the individual sampler in the prior art can be easily disassembled and reused is a structural design that needs to be improved. Utility Model Content

[0005] The utility model aims to provide an individual breath sampling device for particulate matter in the air of a workplace, so as to solve the above-mentioned technical problems existing in the prior art.

[0006] Based on the above objectives, in a first aspect, the present application provides an individual breath sampling device for particulate matter in the air of a workplace, comprising a sampling mask body and an exhaled gas sampling assembly;

[0007] It includes a sampling mask body and an exhaled gas sampling component;

[0008] Air inlets are arranged on both sides of the sampling mask body, and a filter membrane and a filter membrane clamp assembly are arranged at the air inlets; the filter membrane clamp assembly is used to clamp and install the filter membrane; a mask air outlet is arranged at the center or lower part of the surface of the sampling mask body, and the mask air outlet is connected to the exhaled gas sampling assembly;

[0009] The exhaled gas sampling assembly comprises a mask connecting sleeve, an L-shaped mask tube, a quick connecting tube and a color-changing sampling diaphragm assembly;

[0010] Wherein, one end of the mask connecting sleeve is a first soft interlayer, and the mask connecting sleeve is bonded to the edge of the mask air outlet through the first soft interlayer, and the first soft interlayer is used to clamp and bond the edge of the mask air outlet, and the other end of the mask connecting sleeve is a straight tube, and the end of the straight tube of the mask connecting sleeve is connected to and connected with one end of the L-shaped mask tube; the other end of the L-shaped mask tube is detachably connected with the quick connection tube;

[0011] A square diaphragm mounting port is arranged at the other straight tube section where the L-shaped mask tube is located; the color-changing sampling diaphragm assembly comprises a square diaphragm frame body and a second soft interlayer arranged on the outer edge surface of the diaphragm frame body, and a diaphragm clamp located at the bottom of the diaphragm frame body and perpendicular to the surface of the diaphragm frame body; the diaphragm clamp is used for placing and clamping the color-changing sampling diaphragm; and the second soft interlayer is used for clamping and bonding the edge at the diaphragm mounting port.

[0012] Preferably, the exhaled gas sampling assembly further comprises a flow meter installed at the quick-connect tube.

[0013] Preferably, the flow meter is an electronic flow meter equipped with a display screen; two ends of the electronic flow meter are respectively connected to the middle positions of the two sections of the quick-connect pipe.

[0014] Preferably, an annular inner groove is provided on the outer wall of the connecting end of the L-shaped mask tube and the quick-connect tube; the quick-connect tube comprises a pipe fitting portion and an F-shaped tongue of a soft structure installed on the outside of the pipe fitting portion; the head end of the F-shaped tongue is used to be embedded in the annular inner groove of the outer wall of the L-shaped mask tube and locked for a tight fit after the L-shaped mask tube is inserted into a relative position inside the quick-connect tube.

[0015] Preferably, the outer surface layer of the straight tube on the mask connecting sleeve is provided with a threaded hole and a fastening screw; the fastening screw is used to lock and limit the relative position of the straight tube of the mask connecting sleeve inserted into one end of the L-shaped mask tube in the threaded hole.

[0016] Preferably, the mask connecting sleeve, the L-shaped mask tube, the quick connecting tube, and the fastening top screw are engineering plastic structural parts.

[0017] Preferably, the F-shaped tongue of the soft structure is an engineering plastic structural part.

[0018] Preferably, an observation window is provided on the surface of the membrane frame body, and a glass sheet is provided at the observation window.

[0019] Preferably, in the structure of the sampling mask body, a check valve is provided at both the air inlet of the sampling mask body and the mask air outlet of the sampling mask body.

[0020] By adopting the above technical solution, the individual breath sampling device for particulate matter in the workplace air provided by the present application has the following technical effects compared with the prior art:

[0021] The present embodiment provides an individual breath sampling device for particulate matter in the workplace air, wherein air inlets are arranged on both sides of the sampling mask body, and filter membranes (i.e., double filter membrane structures) are arranged at the air inlets; a mask air outlet is arranged at the center or lower part of the surface of the sampling mask body, and the mask air outlet is connected to the exhaled gas sampling assembly; at the same time, the exhaled gas sampling assembly includes a mask connecting sleeve, an L-shaped mask tube, a quick connecting tube, and a color-changing sampling membrane assembly;

[0022] Among them, one end of the mask connecting sleeve is a first soft interlayer, and the mask connecting sleeve is bonded to the edge of the mask air outlet through the first soft interlayer, and the first soft interlayer is used to clamp and bond the edge of the mask air outlet (the structural design of the above-mentioned first soft interlayer can ensure good sealing; the mask connecting sleeve is bonded to the mask air outlet through the first soft interlayer, which can achieve a good sealing effect and avoid leakage of sampling gas), and the other end of the mask connecting sleeve is a straight tube, and the end where the straight tube of the mask connecting sleeve is connected to and connected with one end of the L-shaped mask tube (interference plug-in fit can be preferred); the other end of the L-shaped mask tube is detachably connected with the quick-connect tube; modular design: the device is composed of modules such as a sampling mask body, a mask connecting sleeve, an L-shaped mask tube, a quick-connect tube and a color-changing sampling diaphragm assembly, and each module is detachably connected. This modular design is convenient for assembly, disassembly and maintenance.

[0023] A square diaphragm mounting port is provided at the other straight tube section where the L-shaped mask tube is located; the color-changing sampling diaphragm assembly includes a square diaphragm frame body and a second soft interlayer provided on the outer edge surface of the diaphragm frame body, and a diaphragm clamp located at the bottom of the diaphragm frame body and perpendicular to the surface of the diaphragm frame body; the diaphragm clamp is used to place and clamp the color-changing sampling diaphragm; and the second soft interlayer is used to clamp and bond the edge of the diaphragm mounting port (note that only clamping is required at this time, and bonding is not required, and bonding cannot be disassembled and replaced); Quick replacement of sampling diaphragms: The color-changing sampling diaphragm assembly uses the second soft interlayer to clamp the diaphragm frame body on the diaphragm mounting port, without bonding, which is convenient for quick disassembly and replacement of the sampling diaphragm. In this way, the diaphragm frame body can be quickly disassembled through the above structure, and the color-changing sampling diaphragm on it can be replaced at the same time;

[0024] In general, the device is reasonably designed, modular, easy to maintain and replace consumables, has good sealing and sampling effect, and is suitable for individual breath sampling in the workplace. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] In order to more clearly illustrate the specific implementation methods of the utility model or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0026] Figure 1 It is a three-dimensional structural diagram of an individual breath sampling device for particulate matter in workplace air provided in an embodiment of the present application without a flow meter installed;

[0027] Figure 2 It is a three-dimensional structural diagram of a flow meter installed in an individual breath sampling device for particulate matter in the workplace air provided by an embodiment of the present application;

[0028] Figure 3 A schematic diagram of a three-dimensional structure of an individual breath sampling device for particulate matter in the air of a workplace provided in an embodiment of the present application;

[0029] Figure 4 Another schematic diagram of the three-dimensional structure of the individual breath sampling device for particulate matter in the workplace air provided by an embodiment of the present application;

[0030] Figure 5 A schematic diagram of the structure of an exhaled gas sampling assembly in an individual breath sampling device for particulate matter in workplace air provided in an embodiment of the present application;

[0031] Figure 6A schematic diagram of the structure of a mask connecting sleeve provided in an embodiment of the present application;

[0032] Figure 7 It is another three-dimensional structural diagram of the individual breath sampling device for particulate matter in the air of the workplace;

[0033] Figure 8 A schematic diagram of the three-dimensional structure of an individual breath sampling device for particulate matter in the air of a workplace is also provided;

[0034] Fig. 9 A schematic diagram of the structure of a color-changing sampling membrane assembly provided in an embodiment of the present application;

[0035] Fig.10 Another structural schematic diagram of the color-changing sampling membrane assembly provided in an embodiment of the present application.

[0036] icon:

[0037] Sampling mask body 100; air inlet 101; filter membrane 102; mask air outlet 103;

[0038] Exhaled gas sampling assembly 200; mask connecting sleeve 201; L-shaped mask tube 202; quick-connect tube 203; color-changing sampling diaphragm assembly 204; first soft interlayer 205; diaphragm frame body 206; second soft interlayer 207; diaphragm clamp 208; color-changing sampling diaphragm 209; flow meter 210; annular inner groove 211; pipe fitting part 212; F-shaped tongue 213; fastening top screw 214; observation window 215. DETAILED DESCRIPTION

[0039] The technical solution of the utility model will be described clearly and completely below in conjunction with the accompanying drawings. Obviously, the described embodiments are part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0040] In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present invention 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 limiting the present invention. In addition, the terms "first", "second", and "third" are used for descriptive purposes only, and cannot be understood as indicating or implying relative importance.

[0041] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installation", "connection" and "connection" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0042] Embodiment 1

[0043] like Figure 1 As shown, the first embodiment of the present invention provides an individual breathing sampling device for particulate matter in the air of a workplace, including a sampling mask body 100 and an exhaled gas sampling assembly 200; Figure 1 As shown, Figure 1 It is a personal breath sampling device without a flow meter installed;

[0044] The sampling mask body 100 is provided with air inlets 101 on both sides, and filter membranes 102 are provided at the air inlets; explanation: the diameter of the filter membrane 102 in the embodiment of the present application is about 75 mm, and a corresponding filter membrane clip should be provided; a mask air outlet 103 is provided at the center or lower part of the surface of the sampling mask body, and the mask air outlet is connected to the exhaled gas sampling assembly 200;

[0045] See also Figure 3-Figure 10 The exhaled gas sampling assembly 200 includes a mask connecting sleeve 201, an L-shaped mask tube 202, a quick connecting tube 203 and a color-changing sampling membrane assembly 204;

[0046] Among them, one end of the mask connecting sleeve 201 is a first soft interlayer 205, and the mask connecting sleeve 201 is bonded to the edge of the mask air outlet through the first soft interlayer 205. The first soft interlayer 205 is used to clamp and bond the edge of the mask air outlet. The other end of the mask connecting sleeve 201 is a straight tube, and the end of the straight tube of the mask connecting sleeve 201 is connected and connected to one end of the L-shaped mask tube 202 (interference plug-in fit can be preferred); the other end of the L-shaped mask tube 202 is detachably connected to the quick connection tube 203;

[0047] A square diaphragm mounting port is arranged at the other straight tube section where the L-shaped mask tube 202 is located; the color-changing sampling diaphragm assembly 204 includes a square diaphragm frame body 206 and a second soft interlayer 207 arranged on the outer edge surface of the diaphragm frame body, and a diaphragm clamp 208 located at the bottom of the diaphragm frame body and perpendicular to the surface of the diaphragm frame body; the diaphragm clamp is used to place and clamp the color-changing sampling diaphragm 209; and the second soft interlayer 207 is used to clamp and bond the edge of the diaphragm mounting port (note that only clamping is required at this time, and bonding is not required, and bonding cannot be disassembled and replaced).

[0048] The individual breath sampling device for particulate matter in the workplace air provided in this embodiment has air inlets on both sides of the sampling mask body, and filter membranes (i.e., double filter membrane structures) are arranged at the air inlets; a mask air outlet is arranged at the center or lower part of the surface of the sampling mask body, and the mask air outlet is connected to the exhaled gas sampling assembly;

[0049] Meanwhile, the exhaled gas sampling assembly includes a mask connecting sleeve 201, an L-shaped mask tube 202, a quick connecting tube 203 and a color-changing sampling membrane assembly 204;

[0050] Among them, one end of the mask connecting sleeve 201 is a first soft interlayer, and the mask connecting sleeve 201 is bonded to the edge of the mask outlet through the first soft interlayer, and the first soft interlayer is used to clamp and bond the edge of the mask outlet (the structural design of the above-mentioned first soft interlayer can ensure good sealing; the mask connecting sleeve is bonded to the mask outlet through the first soft interlayer, which can achieve a good sealing effect and avoid leakage of sampling gas), and the other end of the mask connecting sleeve 201 is a straight tube, and the end of the straight tube of the mask connecting sleeve 201 is connected and connected to one end of the L-shaped mask tube 202 (interference plug-in fit can be preferred); the other end of the L-shaped mask tube 202 is detachably connected with the quick connection tube 203; modular design: the device is composed of modules such as a sampling mask body, a mask connecting sleeve, an L-shaped mask tube, a quick connection tube and a color-changing sampling diaphragm assembly, and each module is detachably connected. This modular design is convenient for assembly, disassembly and maintenance.

[0051] A square diaphragm mounting port is provided at another straight tube section where the L-shaped mask tube 202 is located; the color-changing sampling diaphragm assembly 204 includes a square diaphragm frame body and a second soft interlayer provided on the outer edge surface of the diaphragm frame body, and a diaphragm clamp located at the bottom of the diaphragm frame body and perpendicular to the surface of the diaphragm frame body; the diaphragm clamp is used to place and clamp the color-changing sampling diaphragm; and the second soft interlayer is used to clamp and bond the edge of the diaphragm mounting port (note that only clamping is required at this time, and bonding is not required, and bonding cannot be disassembled and replaced); Quick replacement of sampling diaphragms: The color-changing sampling diaphragm assembly uses the second soft interlayer to clamp the diaphragm frame body on the diaphragm mounting port, without bonding, which is convenient for quick disassembly and replacement of the sampling diaphragm. In this way, the diaphragm frame body can be quickly disassembled through the above structure, and the color-changing sampling diaphragm on it can be replaced at the same time;

[0052] In general, the device is reasonably designed, modular, easy to maintain and replace consumables, has good sealing and sampling effect, and is suitable for individual breath sampling in the workplace.

[0053] Embodiment 2

[0054] like Figure 2-Figure 10 As shown, the second embodiment of the present utility model provides an individual breathing sampling device for particulate matter in the air of a workplace, comprising a sampling mask body 100 and an exhaled gas sampling assembly 200;

[0055] Air inlets 101 are provided on both sides of the sampling mask body 100, and filter membranes 102 are provided at the air inlets; a mask air outlet 103 is provided at the center or lower part of the surface of the sampling mask body, and the mask air outlet is connected to the exhaled gas sampling assembly 200;

[0056] The exhaled gas sampling assembly 200 includes a mask connecting sleeve 201, an L-shaped mask tube 202, a quick connecting tube 203 and a color-changing sampling diaphragm assembly 204; at the same time, the above-mentioned embodiment 2 has the same structure of the exhaled gas sampling assembly as that in embodiment 1; the difference is that the flow meter 210 and other structures of the exhaled gas sampling assembly are also designed in embodiment 2, and details are shown in the subsequent technical solutions.

[0057] The sampling mask body provided in the second embodiment is also provided with ear hanging structures, i.e., hanging straps, at both ends thereof; the sampling mask body provided in the second embodiment has air inlets on both sides thereof, and filter membranes are provided at the air inlets, i.e., a double filter membrane structure; however, the above-mentioned color-changing sampling membrane is mainly used to observe the gas enrichment at the air outlet, and the color-changing sampling membrane itself selects a particle indicator filter membrane, which will change color after encountering a certain concentration or a certain amount of gas particle enrichment, and is replaced through the above-mentioned observation window; the filter membrane structure (or double filter membrane structure) is used to collect inhaled gas;

[0058] Explanation: The above-mentioned filter membrane structure is used in conjunction with an electronic flow meter. Within a preset test period (for example, one hour), the weight of the filter membrane structure on both sides is weighed before and after the test, and the weight difference before and after the test is compared; the weight difference after the test can be used to calculate the mass A (in mg) in the inhaled gas; the electronic flow meter measures the volume V (in m3) of the exhaled gas from the human body; after the test is completed, the tester can use C air dust concentration = A / V; in this way, while completing the sampling, the concentration test can also be completed.

[0059] It should be noted that the color-changing sampling membrane used on the above-mentioned membrane clamp is called a "particle indicator filter". It can change color when it comes into contact with a certain concentration of air particles. This filter is used in personal air samplers to indicate the particle concentration level in real time or semi-real time.

[0060] The working principle of the above-mentioned particle indicator filter is based on a chemical reaction or dye color change mechanism. When the particles in the air pass through the filter, the particles react or adsorb with the indicator or dye on the filter, resulting in a visible change in the color of the filter. The degree of color change or color depth can be correlated with the concentration of the particles, which will not be described in detail.

[0061] In the specific technical solution of the embodiment of the utility model, the exhaled gas sampling assembly further includes a flow meter 210 installed at the quick-connect tube 203. The flow meter is an electronic flow meter with a display screen installed; the two ends of the electronic flow meter are respectively connected to the middle position of the two sections of the quick-connect tube 203.

[0062] Preferably, in the structure of the sampling mask body, a check valve is provided at both the air inlet of the sampling mask body and the mask air outlet of the sampling mask body.

[0063] In the specific technical scheme of the embodiment of the utility model, the outer wall of the connection end of the L-shaped mask tube 202 and the quick-connect tube is provided with an annular inner groove 211; the quick-connect tube 203 includes a pipe part 212 and an F-shaped tongue 213 of a soft structure installed on the outside of the pipe part; the head end of the F-shaped tongue (the F-shaped tongue has a head end, i.e., the first horizontal line end above in F, the middle position of the F-shaped structure, i.e., the second horizontal line end, is the structure of the connecting pipe part, and also acts as a lever; the lower part of the vertical line end of the F-shaped structure acts as a handle, which can release the locking fit after being tilted) is used to embed into the annular inner groove of the outer wall of the L-shaped mask tube 202 after the L-shaped mask tube 202 is inserted into the relative position inside the quick-connect tube 203 and lock it for a tight fit.

[0064] The above structure has the function of quick connection and disassembly; since the quick connection tube is provided with a soft F-shaped tongue structure, when the L-shaped mask tube is inserted, the end of the F-shaped tongue can be embedded in the annular inner groove of the outer wall of the L-shaped mask tube to achieve a quick locking connection. When disassembling, just pull the handle end of the F-shaped tongue and tilt it to a certain angle to quickly unlock and disassemble.

[0065] Reliable locking function: After the F-type tongue end is embedded in the annular inner groove, a reliable locking fit can be achieved to prevent accidental falling off and ensure the firmness of the connection during the sampling process. The locking connection structure tightly surrounds the outer wall of the pipe, which can form a good seal at the connection to prevent the sampling gas from leaking and affecting the sampling results.

[0066] This quick-locking connection structure is easy to operate and does not require any tools. It can be connected or disassembled with just one manual action, making it convenient for on-site use.

[0067] In the specific technical scheme of an embodiment of the utility model, the outer surface layer of the straight tube on the mask connecting sleeve 201 is provided with a threaded hole and a fastening screw 214; the fastening screw is used to lock and limit the relative position of the straight tube of the mask connecting sleeve 201 inserted into one end of the L-shaped mask tube 202 in the threaded hole.

[0068] Preferably, the mask connecting sleeve 201, the L-shaped mask tube 202, the quick connecting tube 203, and the fastening top screw are engineering plastic structural parts. The F-shaped tongue of the soft structure is an engineering plastic structural part.

[0069] Preferably, an observation window 215 is provided on the surface of the diaphragm frame body, and a glass sheet is provided at the observation window. The working principle of the above-mentioned particle indicator filter is that when the particles in the air pass through the filter membrane, the particles react or adsorb with the indicator or dye on the filter membrane, resulting in a visible change in the color of the filter membrane. However, an observation window is provided on the surface of the diaphragm frame body, so that the color change of the color-changing sampling diaphragm can be easily observed from the outside, so as to conveniently understand the concentration of the particles. Then, according to experience, when the color-changing sampling diaphragm changes to a certain extent, it can be determined that the collection point at this time, that is, the filter membrane should also collect a large amount of particles, so that the operator can determine that the filter membrane structure at the collection point (i.e., at the air inlet) needs to be replaced.

[0070] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the utility model, rather than to limit it. Although the utility model has been described in detail with reference to the aforementioned embodiments, ordinary technicians in this field should understand that they can still modify the technical solutions recorded in the aforementioned embodiments, or replace some or all of the technical features therein with equivalents. However, these modifications or replacements do not make the essence of the corresponding technical solution deviate from the scope of the technical solution of the embodiments of the utility model.

Claims

1. An individual breath sampling device for particulate matter in workplace air, characterized in that: It includes a sampling mask body and an exhaled gas sampling component; Air inlets are arranged on both sides of the sampling mask body, and a filter membrane and a filter membrane clamp assembly are arranged at the air inlets; the filter membrane clamp assembly is used to clamp and install the filter membrane; a mask air outlet is arranged at the center or lower part of the surface of the sampling mask body, and the mask air outlet is connected to the exhaled gas sampling assembly; The exhaled gas sampling assembly comprises a mask connecting sleeve, an L-shaped mask tube, a quick connecting tube and a color-changing sampling diaphragm assembly; Wherein, one end of the mask connecting sleeve is a first soft interlayer, and the mask connecting sleeve is bonded to the edge of the mask air outlet through the first soft interlayer, and the first soft interlayer is used to clamp and bond the edge of the mask air outlet, and the other end of the mask connecting sleeve is a straight tube, and the end of the straight tube of the mask connecting sleeve is connected to and connected with one end of the L-shaped mask tube; the other end of the L-shaped mask tube is detachably connected with the quick connection tube; A square diaphragm mounting port is arranged at the other straight tube section where the L-shaped mask tube is located; the color-changing sampling diaphragm assembly comprises a square diaphragm frame body and a second soft interlayer arranged on the outer edge surface of the diaphragm frame body, and a diaphragm clamp located at the bottom of the diaphragm frame body and perpendicular to the surface of the diaphragm frame body; the diaphragm clamp is used for placing and clamping the color-changing sampling diaphragm; and the second soft interlayer is used for clamping and bonding the edge at the diaphragm mounting port.

2. The individual breath sampling device for particulate matter in workplace air according to claim 1, characterized in that: The exhaled gas sampling assembly further comprises a flow meter installed at the quick-connect tube.

3. The individual breath sampling device for particulate matter in workplace air according to claim 2, characterized in that: The flow meter is an electronic flow meter equipped with a display screen; two ends of the electronic flow meter are respectively connected to the middle positions of the two sections of the quick-connect pipe.

4. The individual breath sampling device for particulate matter in workplace air according to claim 3, characterized in that: An annular inner groove is provided on the outer wall of the connecting end of the L-shaped mask tube and the quick-connect tube; the quick-connect tube includes a pipe part and an F-shaped tongue of a soft structure installed on the outside of the pipe part; the head end of the F-shaped tongue is used to be embedded in the annular inner groove of the outer wall of the L-shaped mask tube and locked for a tight fit after the L-shaped mask tube is inserted into a relative position inside the quick-connect tube.

5. The individual breath sampling device for particulate matter in workplace air according to claim 4, characterized in that: The outer surface layer of the straight tube on the mask connecting sleeve is provided with a threaded hole and a fastening screw; the fastening screw is used to lock and limit the relative position of the straight tube of the mask connecting sleeve by inserting one end of the L-shaped mask tube into the threaded hole.

6. The individual breath sampling device for particulate matter in workplace air according to claim 5, characterized in that: The mask connecting sleeve, the L-shaped mask tube, the quick connecting tube, and the fastening top screw are engineering plastic structural parts.

7. The individual breath sampling device for particulate matter in workplace air according to claim 4, characterized in that: The F-shaped clamping tongue of the soft structure is an engineering plastic structural part.

8. The individual breath sampling device for particulate matter in workplace air according to claim 7, characterized in that: An observation window is arranged on the surface of the membrane frame body, and a glass sheet is arranged at the observation window.

9. The individual breath sampling device for particulate matter in workplace air according to claim 4, characterized in that: Check valves are provided at the air inlet of the sampling mask body and the mask air outlet of the sampling mask body.

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