A concentrated sampling device for environmental atmosphere detection

Abstract

The present invention relates to the field of atmosphere detection technology, and discloses a concentrated sampling device for environmental atmosphere detection, comprising a shell, a sampling channel, an air pump, an adsorption module, a desorption module, a collection box and a control module, wherein the adsorption module comprises a filter plate and an action mechanism, wherein the filter plate is arranged to be double-layered and foldable, and under the action of the action mechanism, the filter plate switches between the state of entering and leaving the sampling channel, and when the filter plate is merged and inserted into the sampling channel, the pollutants passing through are enriched and sampled, and when the filter plate is separated from the sampling channel and opened, it fits with the action end of the desorption module, and the collected pollutants are desorbed into the collection box. The present invention separates and processes the sampling enrichment part from the sampling part, avoids the atmosphere and airflow in the sampling channel from interfering with the highly sensitive target pollutants, effectively avoids their volatilization and change, meets the collection requirements of high concentration concentration, and helps to improve the efficiency and accuracy of sampling.

Description

Technical Field

[0001] The invention relates to the technical field of atmosphere detection, and more specifically, to a concentrated sampling device for ambient atmosphere detection. Background Art

[0002] The concentration of pollutants in indoor air is generally low. Although testing technology has made great progress and many highly sensitive automatic measuring instruments have emerged, for many pollutants, direct sampling methods often cannot meet the analysis requirements. It is necessary to use concentrated (enriched) sampling methods to concentrate the pollutants in indoor air so that they meet the sensitivity requirements of analysis.

[0003] At present, the commonly used technical means for concentrated sampling is the "adsorption method". The so-called "adsorption method" is to adsorb the pollutants onto a fixed adsorbent, and then separate the concentrated pollutants through thermal desorption, solvent elution and other methods.

[0004] In existing concentrated sampling equipment, the sampling part and the collection part are often integrated into one, and desorption is carried out directly after adsorption. The atmosphere and airflow in the channel interfere with highly sensitive target pollutants (such as volatile organic compounds, particulate matter, etc.), causing them to volatilize and change, reducing the efficiency and accuracy of sampling. Summary of the invention

[0005] The present invention provides a concentrated sampling device for environmental atmosphere detection, which solves the technical problem in the related art that the sampling part and the collection part are integrated to interfere with the collection of highly sensitive target pollutants.

[0006] The present invention provides a concentrated sampling device for ambient atmosphere detection, comprising a housing, a sampling channel, an air pump, an adsorption module, a desorption module and a collection box, wherein the housing is provided with a sampling channel connected to the external environment, the air pump outputs negative pressure, and its output end is connected to the sampling channel;

[0007] The adsorption module includes a filter plate and an action mechanism. The filter plate is configured to be double-layered and foldable. Under the action of the action mechanism, the filter plate switches between the state of entering and leaving the sampling channel. When the filter plate is merged and inserted into the sampling channel, the pollutants passing through are enriched and sampled. When the filter plate leaves the sampling channel and opens, it fits with the action end of the desorption module to desorb the collected pollutants into the collection box.

[0008] The filter plate is filled with solid adsorbents that are enriched with atmospheric pollutants.

[0009] As a further solution of the present invention: the action mechanism includes a base, a shaft head, a motor, a connecting strip, a slide groove, an end block, a first rotating head, a second rotating head, an ear block, a slider, a transfer strip, a clamping column, a limit plate and a guide groove, the base is rotatably mounted with the shaft head, the motor is fixedly arranged on the base, and the output end of the motor is fixed to the shaft head, the connecting strip is fixedly arranged on the shaft head, the connecting strip is provided with a slide groove, the connecting strip is fixedly provided with an end block at one end away from the shaft head, the first rotating head and the second rotating head are rotatably mounted on the end block, the first rotating head and the second rotating head are respectively fixed to a layer of the filter plate, an ear block is fixedly arranged on each layer of the filter plate, a slider is slidably arranged in the slide groove, a transfer strip is hingedly arranged between the ear block and the slider, a limit plate is fixedly arranged on the base, a guide groove is provided on the limit plate, and a clamping column that is engaged with the guide groove is fixedly arranged on the slider.

[0010] As a further solution of the present invention: the solid adsorbent is activated carbon.

[0011] As a further solution of the present invention: the solid adsorbent is silica gel.

[0012] As a further solution of the present invention: the desorption module includes a water cylinder, a conduit, a liquid collecting plate and a nozzle, the water cylinder is fixed in the shell, a liquid collecting plate is opened on one side of the bottom of the water cylinder, and nozzles facing the collection box are evenly arranged on the liquid collecting plate. The water cylinder is connected to the liquid collecting plate through a conduit, and a solvent that can wash away pollutants is stored in the water cylinder.

[0013] As a further solution of the present invention: the guide groove is configured as a combination of a straight line segment and an arc segment.

[0014] As a further solution of the present invention: the collecting box and the shell can be slidably separated.

[0015] As a further solution of the present invention: a gas sampling port connected to the sampling channel is provided on the shell, and the gas sampling port and the sampling channel have a cone-shaped transition.

[0016] As a further solution of the present invention: a guide rail and a bracket are provided on the outer shell, a cover body matching the gas collection port is slidably installed on the guide rail, a tube body is connected to the cover body, a notch matching the outer wall of the tube body is provided on the bracket, protrusions are symmetrically fixedly installed on the outer wall of the cover body, bolts are threadedly connected to the protrusions, and the bolts abut against the outer shell.

[0017] As a further solution of the present invention: the control module includes a flow sensor, a control circuit, a touch screen, a drive circuit and a lithium battery. The control circuit is integrated in the touch screen and connected to the drive circuit and the motor. The air pump is integrated with a flow sensor and connected to the control circuit through the drive circuit. The lithium battery supplies power to the control circuit.

[0018] The beneficial effects of the present invention are:

[0019] The present invention utilizes an action mechanism to drive the filter plate to switch its posture and shape, separates the sampling enrichment site from the sampling site, and avoids mutual interference between the two. For some highly sensitive target pollutants, when desorbing, the filter plate can directly leave the original atmosphere environment, avoiding the atmosphere and airflow in the sampling channel from interfering with the highly sensitive target pollutants, effectively preventing their volatilization and change, meeting the collection requirements of high concentration concentration, and helping to improve the efficiency and accuracy of sampling.

[0020] Compared with single-layer adsorption, the double-layer design of the filter plate of the present invention adsorbs more and has a more comprehensive adsorption effect. When traditional single-layer adsorption is used, if the air flow speed is relatively fast, some pollutants escape from the filter plate before being adsorbed by the solid adsorbent, resulting in a difference between the test results and the actual situation. The design of the double-layer filter plate increases the difficulty of pollutants escaping from the filter plate, thereby reducing the error between the test results and the actual situation.

[0021] The filter plate of the present invention will unfold during desorption, which helps to improve the efficiency during desorption.

[0022] The present invention is applied in continuous detection operations. After the desorption of the filter plate is completed, when the next collection is carried out, the filter plate is pressed back into the sampling channel by utilizing the reverse drive of the motor. In this process, when the filter plates are instantaneously merged, a slapping action is generated between the two filter plates, which helps to remove the sample residues that were not completely removed during the previous desorption, and provides a clean collection end for subsequent enrichment sampling. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 It is a schematic diagram of the overall structure of a concentrated sampling device for ambient atmosphere detection proposed by the present invention;

[0024] Figure 2 It is a schematic diagram of the internal structure of a concentrated sampling device for ambient atmosphere detection proposed by the present invention;

[0025] Figure 3 It is a schematic diagram of some details of the structure of a concentrated sampling device for ambient atmosphere detection proposed by the present invention;

[0026] Figure 4It is a schematic diagram of the structure of an adsorption module in a concentrated sampling device for ambient atmosphere detection proposed by the present invention;

[0027] Figure 5 It is a schematic diagram of the switching of the action state of the adsorption module in the concentrated sampling device for ambient atmosphere detection proposed by the present invention;

[0028] Figure 6 It is a detailed structural diagram of the gas sampling port in a concentrated sampling device for ambient atmosphere detection proposed by the present invention;

[0029] Figure 7 This is a schematic diagram of the installation structure of a collection box in a concentrated sampling device for ambient atmosphere detection proposed by the present invention;

[0030] Figure 8 The present invention Figure 4 The enlarged structural diagram at A in the middle;

[0031] Fig. 9 This is a schematic diagram of the working structure when the present invention adopts thermal desorption;

[0032] Fig.10 It is a schematic diagram of the working structure when the present invention adopts spraying solvent for desorption.

[0033] In the figure: 10, housing; 100, gas sampling port; 101, guide rail; 102, bracket; 20, sampling channel; 201, cover; 202, tube; 203, convex piece; 204, bolt; 21, air pump; 3, adsorption module; 31, base; 32, shaft head; 33, motor; 34, connecting strip; 340, slide; 35, end block; 36, first rotating head; 37, second rotating head; 38, filter plate; 380, solid Adsorbent; 39, ear block; 310, slider; 311, adapter strip; 312, card column; 313, limit plate; 3130, guide groove; 40, desorption module; 401, water cylinder; 402, catheter; 403, liquid collecting plate; 404, nozzle; 41, electric heating plate; 50, collection box; 60, control module; 61, flow sensor; 62, control circuit; 63, touch screen; 64, drive circuit; 65, lithium battery. DETAILED DESCRIPTION

[0034] The subject matter described herein will now be discussed with reference to example implementations. It should be understood that the discussion of these implementations is only to enable those skilled in the art to better understand and implement the subject matter described herein, and the functions and arrangements of the elements discussed may be changed without departing from the scope of protection of the contents of this specification. Various examples may omit, replace, or add various processes or components as needed. In addition, the features described in some examples may also be combined in other examples.

[0035] Embodiment 1

[0036] The present invention discloses a concentrated sampling device for ambient atmosphere detection, such as Figure 1 - Fig.10 As shown, it includes a housing 10, a sampling channel 20, an air pump 21, an adsorption module 3, a desorption module 40 and a collection box 50. The housing 10 is provided with a sampling channel 20 connected to the external environment, and the air pump 21 outputs negative pressure, and its output end is connected to the sampling channel 20;

[0037] The adsorption module 3 includes a filter plate 38 and an action mechanism. The filter plate 38 is configured to be double-layered and foldable. Under the action of the action mechanism, the filter plate 38 switches between the state of entering and leaving the sampling channel 20. When the filter plate 38 is merged and inserted into the sampling channel 20, the passing pollutants are enriched and sampled. When the filter plate 38 is separated from the sampling channel 20 and opened, it fits with the action end of the desorption module 40 to desorb the collected pollutants into the collection box 50.

[0038] The filter plate 38 is filled with a solid adsorbent 380 that is enriched with atmospheric pollutants.

[0039] The action mechanism includes a base 31, a shaft head 32, a motor 33, a connecting strip 34, a slide groove 340, an end block 35, a first rotating head 36, a second rotating head 37, an ear block 39, a slider 310, a transfer strip 311, a clamping column 312, a limit plate 313 and a guide groove 3130. The shaft head 32 is rotatably mounted on the base 31, the motor 33 is fixedly arranged on the base 31, and the output end of the motor 33 is fixed to the shaft head 32. The connecting strip 34 is fixed on the shaft head 32, and the slide groove 340 is opened in the connecting strip 34. The connecting strip 34 is fixedly arranged at one end away from the shaft head 32. There is an end block 35, on which a first rotating head 36 and a second rotating head 37 are rotatably mounted, the first rotating head 36 and the second rotating head 37 are respectively fixed to a layer of the filter plate 38, an ear block 39 is fixedly provided on each layer of the filter plate 38, a slider 310 is slidably provided in the slide groove 340, a transfer strip 311 is hingedly provided between the ear block 39 and the slider 310, a limit plate 313 is fixedly provided on the base 31, a guide groove 3130 is opened on the limit plate 313, and a clamping column 312 that is engaged with the guide groove 3130 is fixedly provided on the slider 310.

[0040] The composition of the solid adsorbent 380 includes but is not limited to activated carbon, silica gel and polymers thereof.

[0041] like Figure 5 As shown, the action mechanism can be used to drive the filter plate 38 to switch its posture and shape. In the initial state, as shown in FIG. Figure 5 On the left side, the filter plate 38 is in a merged state. At this time, the filter plate 38 is located in the sampling channel 20 as a whole. Figure 3 As shown, under the negative pressure suction effect generated by the air pump 21, the air to be tested is sucked into the sampling channel 20, and the filter plate 38 adsorbs and enriches the pollutants in the passing air. After a period of collection is completed, the driving motor 33 causes the shaft head 32 to rotate around the base 31. During the process of the shaft head 32 rotating 90 degrees, the cooperation between the clamping column 312 and the guide groove 3130 is used to drive the slider 310 to slide relative to the slide groove 340, and the sliding action of the slider 310 will pull the structural action on the side of the transfer bar 311. By utilizing the connection between the transfer bar 311 and the ear block 39, the first rotating head 36 and the second rotating head 37 are driven to rotate 90 degrees in opposite directions, so that the filter plate 38 can be opened while completing the displacement, as shown in FIG. Figure 5 On the middle right side, the displacement causes the filter plate 38 to be transferred from the sampling enrichment site (in the sampling channel 20) to fit with the sampling site (the active end of the desorption module 40), and the expansion causes the filter plate 38 to change from a double-layer state to a single-layer state.

[0042] In traditional gas concentration sampling equipment, the sampling part and the collection part are often integrated, and desorption is directly performed after adsorption. In this application, the sampling enrichment part is separated from the sampling part, which produces significant advantages and unique technical effects, specifically:

[0043] First, mutual interference between the two is avoided. For some highly sensitive target pollutants, when desorbing, the filter plate 38 can directly leave the original atmosphere environment, avoiding the atmosphere and airflow in the sampling channel 20 from interfering with the highly sensitive target pollutants, effectively preventing them from volatilizing and changing, meeting the collection requirements of high concentration concentration, and helping to improve the efficiency and accuracy of sampling;

[0044] Second, the double-layer design of the filter plate 38 has a larger adsorption amount and a more comprehensive adsorption effect than the single-layer adsorption. When the traditional single-layer adsorption is adopted, if the airflow speed is relatively fast, some pollutants escape from the filter plate 38 before being adsorbed by the solid adsorbent 380, thus causing a difference between the test result and the actual situation. The design of the double-layer filter plate 38 increases the difficulty of pollutants escaping from the filter plate 38, thereby reducing the error between the test result and the actual situation.

[0045] 3. The filter plate 38 will be unfolded during desorption, which helps to improve the efficiency of desorption;

[0046] 4. In the continuous detection application, after the desorption of the filter plate 38 is completed, when the next collection is carried out, the filter plate 38 is pressed back into the sampling channel 20 by the reverse drive of the motor 33. In this process, when the filter plates 38 are instantaneously merged, a slapping action will be generated between the two filter plates 38, which is helpful to remove the sample residues that were not completely removed during the previous desorption, and provide a clean collection end for subsequent enrichment sampling.

[0047] like Figure 2 and Fig.10 As shown, the desorption module 40 includes a water cylinder 401, a conduit 402, a liquid collecting plate 403 and a nozzle 404. The water cylinder 401 is fixed in the shell 10, and a liquid collecting plate 403 is opened on one side of the bottom of the water cylinder 401. The liquid collecting plate 403 is evenly arranged with nozzles 404 facing the collection box 50. The water cylinder 401 is connected to the liquid collecting plate 403 through the conduit 402, and the water cylinder 401 stores a solvent that can wash away pollutants.

[0048] After the filter plate 38 is transferred between the nozzle 404 and the collection box 50, the desorption module 40 performs desorption. Specifically, the solvent in the water cylinder 401 passes through the conduit 402 and the liquid collecting plate 403, and is sprayed from the nozzle 404 onto the filter plate 38, and the pollutants enriched thereon are washed off and fall into the collection box 50 below. It should be noted that Figure 2 The collection box 50 shown in the figure is only for illustration. The actual depth of the collection box 50 will be designed to prevent the liquid from splashing out. In addition, the start and stop components (such as water pumps, etc.) for controlling the spraying of solvent from the nozzle 404 are prior arts and will not be described in detail here.

[0049] like Figure 4 As shown, the guide groove 3130 is configured as a combination of a straight line segment and an arc segment.

[0050] When the clamping column 312 cooperates with the arc segment of the guide groove 3130, the displacement action and the expansion action are performed simultaneously. When it cooperates with the straight segment of the guide groove 3130, only the displacement action is performed. The purpose of this arrangement is to avoid the sampling channel 20 structure from blocking the flipping and merging actions of the filter plate 38. During the expansion stage of the filter plate 38, it is first displaced for a section (the clamping column 312 cooperates with the straight segment of the guide groove 3130) so that the filter plate 38 completely leaves the coverage range of the sampling channel 20, and then it is displaced and expanded (the clamping column 312 cooperates with the arc segment of the guide groove 3130). The same is true when the filter plate 38 is retracted.

[0051] like Figure 7 As shown, the collection box 50 and the housing 10 are slidably separated.

[0052] After the collection box 50 has been sampled, the sliding separation design makes it easy to remove it without affecting the operation of other components.

[0053] like Figure 2 and Figure 6 As shown, the housing 10 is provided with a gas sampling port 100 connected to the sampling channel 20 , and the gas sampling port 100 and the sampling channel 20 are in a cone-shaped transition.

[0054] The cone shape at the connection between the gas sampling port 100 and the sampling channel 20 is utilized to improve the enrichment degree of the external atmosphere when it enters the sampling channel 20 .

[0055] Embodiment 2

[0056] On the basis of implementation one, Fig. 9 As shown, the desorption module 40 may also be an electric heating plate 41 , and the filter plate 38 is closely attached to the heating surface of the electric heating plate 41 after being unfolded.

[0057] Different sample desorption methods can be selected according to the actual application environment and requirements. For example, when the pollutant sample in the atmosphere is sensitive to heat, the electric heating plate 41 is selected for thermal desorption, and when the pollutant sample is sensitive to the solvent, the solvent elution method in Example 1 can be selected.

[0058] Implementation Three

[0059] Based on the above embodiments, Figure 6 As shown, the outer shell 10 is provided with a guide rail 101 and a bracket 102, a cover body 201 matching the gas collection port 100 is slidably installed on the guide rail 101, a tube body 202 is connected to the cover body 201, a notch matching the outer wall of the tube body 202 is provided on the bracket 102, and a protrusion 203 is symmetrically fixedly installed on the outer wall of the cover body 201, and a bolt 204 is threadedly connected to the protrusion 203, and the bolt 204 abuts against the outer shell 10.

[0060] When the sampling device is used in specific applications, there is a difference between two detection environments: broad detection and targeted detection. In the aforementioned embodiment, the entrance end of the sampling channel 20 is set to an open form through the gas sampling port 100, which is suitable for an open detection environment. In this embodiment, the gas sampling port 100 is closed by sliding the cover body 201, and the gas sampling part is transferred to the mouth of the tube body 202. The mouth of the tube body 202 is connected to the action part that needs to be specially detected for gas pollutants (for example, a certain gas pipeline), and then it can be switched to the targeted detection state.

[0061] Embodiment 4

[0062] Based on the above embodiments, Figure 1 As shown, a concentrated sampling device for environmental atmosphere detection also includes a control module 60, wherein the control module 60 includes a flow sensor 61, a control circuit 62, a touch screen 63, a drive circuit 64 and a lithium battery 65. The control circuit 62 is integrated in the touch screen 63 and connected to the drive circuit 64 and the motor 33. The air pump 21 is integrated with the flow sensor 61 and is connected to the control circuit 62 through the drive circuit 64. The lithium battery 65 supplies power to the control circuit 62.

[0063] A flow sensor 61 is provided to monitor the flow of the air pump 21 , and the monitoring data is used as a reference to adjust the coordination between the output of the motor 33 and the output of the air pump 21 through the control circuit 62 , thereby obtaining a more accurate concentrated sampling control method.

[0064] The above describes an embodiment of the present invention, but this embodiment is not limited to the above-mentioned specific implementation mode. The above-mentioned specific implementation mode is merely illustrative and not restrictive. Under the guidance of this embodiment, ordinary technicians in this field can also make more forms of equivalent embodiments, all of which are within the protection of this embodiment.

Claims

1. A concentrated sampling device for ambient atmosphere detection, characterized in that: The device comprises a housing (10), a sampling channel (20), an air pump (21), an adsorption module (3), a desorption module (40), a collection box (50) and a control module (60); the housing (10) is provided with a sampling channel (20) which is in communication with the external environment; the air pump (21) outputs negative pressure, and its output end is in communication with the sampling channel (20); The adsorption module (3) comprises a filter plate (38) and an action mechanism. The filter plate (38) is configured to be double-layered and foldable. Under the action of the action mechanism, the filter plate (38) switches between a state of entering and leaving the sampling channel (20). When the filter plate (38) is merged and inserted into the sampling channel (20), it collects and samples the pollutants passing through. When the filter plate (38) is separated from the sampling channel (20) and opened, it fits with the action end of the desorption module (40) to desorb the collected pollutants into the collection box (50). The filter plate (38) is filled with a solid adsorbent (380) that is capable of accumulating atmospheric pollutants; The action mechanism comprises a base (31), a shaft head (32), a motor (33), a connecting strip (34), a slide groove (340), an end block (35), a first rotating head (36), a second rotating head (37), an ear block (39), a slider (310), a transfer strip (311), a clamping column (312), a limit plate (313) and a guide groove (3130); the base (31) is rotatably mounted with the shaft head (32); the motor (33) is fixedly arranged on the base (31), and an output end of the motor (33) is fixed to the shaft head (32); a connecting strip (34) is fixedly arranged on the shaft head (32); a slide groove (340) is provided in the connecting strip (34); the connecting strip (34) is away from the shaft head (32) and is arranged at a position close to the shaft head (32). An end block (35) is fixedly provided at the end, a first rotating head (36) and a second rotating head (37) are rotatably mounted on the end block (35), the first rotating head (36) and the second rotating head (37) are respectively fixed to a layer of the filter plate (38), an ear block (39) is fixedly provided on each layer of the filter plate (38), a slider (310) is slidably provided in the slide groove (340), a transfer strip (311) is hingedly provided between the ear block (39) and the slider (310), a limit plate (313) is fixedly provided on the base (31), a guide groove (3130) is provided on the limit plate (313), and a clamping column (312) that is clamped and matched with the guide groove (3130) is fixedly provided on the slider (310); The guide groove (3130) is configured as a combination of a straight line segment and an arc segment.

2. A concentrated sampling device for ambient atmosphere detection according to claim 1, characterized in that: The solid adsorbent (380) is activated carbon.

3. The concentrated sampling equipment for ambient atmosphere detection according to claim 1 is characterized in that: The solid adsorbent (380) is silica gel.

4. The concentrated sampling equipment for ambient atmosphere detection according to claim 1 is characterized in that: The desorption module (40) comprises a water cylinder (401), a conduit (402), a liquid collecting plate (403) and a nozzle (404); the water cylinder (401) is fixed in the housing (10); a liquid collecting plate (403) is provided on one side of the bottom of the water cylinder (401); nozzles (404) facing the collection box (50) are evenly arranged on the liquid collecting plate (403); the water cylinder (401) and the liquid collecting plate (403) are connected via the conduit (402); and a solvent capable of washing out pollutants is stored in the water cylinder (401).

5. The concentrated sampling equipment for ambient atmosphere detection according to claim 1, characterized in that: The collection box (50) and the housing (10) are slidably separable.

6. The concentrated sampling equipment for ambient atmosphere detection according to claim 1 is characterized in that: The housing (10) is provided with a gas sampling port (100) which is in communication with the sampling channel (20), and the gas sampling port (100) and the sampling channel (20) are in a cone-shaped transition.

7. The concentrated sampling equipment for ambient atmosphere detection according to claim 1 is characterized in that: The outer shell (10) is provided with a guide rail (101) and a bracket (102); a cover body (201) matching with the gas collection port (100) is slidably mounted on the guide rail (101); a tube body (202) is connected to the cover body (201); a notch matching with the outer wall of the tube body (202) is provided on the bracket (102); convex pieces (203) are symmetrically fixedly mounted on the outer wall of the cover body (201); bolts (204) are threadedly connected to the convex pieces (203); and the bolts (204) are in contact with the outer shell (10).

8. The concentrated sampling equipment for ambient atmosphere detection according to claim 1 is characterized in that: The control module (60) comprises a flow sensor (61), a control circuit (62), a touch display screen (63), a drive circuit (64) and a lithium battery (65); the control circuit (62) is integrated in the touch display screen (63) and connected to the drive circuit (64) and the motor (33); the air pump (21) is integrated with the flow sensor (61) and connected to the control circuit (62) via the drive circuit (64); and the lithium battery (65) supplies power to the control circuit (62).

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