Dust filtering device of gaseous pollutant analyzer

Abstract

The utility model relates to pollutant monitoring, in particular to a dust filtering device of a gaseous pollutant analyzer, which comprises a filter membrane, and two ends of the filter membrane are respectively wound on a first rotating wheel and a second rotating wheel; each filter unit comprises a first pipeline and a second pipeline which are respectively arranged on the upper side and the lower side of the filter membrane; the bearing part is arranged on the first pipeline, and the elastic part is arranged between the bearing part and the limiting part; the limiting piece is arranged on the upper side of the elastic piece and the upper side of the bearing piece, and the first pipeline moves up and down along the guiding piece. The driving module is used for driving the bearing part to move up and down. The device has the advantages of automation, digitization and the like, and is applied to gaseous pollutant monitoring.

Description

TECHNICAL FIELD

[0001] The utility model relates to pollutant monitoring, especially relate to dust filter device of gaseous pollutant analyzer. BACKGROUND

[0002] The most main one of gaseous pollutant analyzer is point type analyzer, that is, the monitoring analysis instrument that sample gas is taken in and the concentration of air pollutant is determined through sampling system on fixed point. To prevent particulate matter dust from entering the analyzer, the pore size of polytetrafluoroethylene filter membrane between the analyzer and sample gas source should be no more than 5 μm.

[0003] Different industries will specify the maximum period of film replacement according to different applications. For example, the filter membrane between the sampling branch pipe and the analyzer in the field of environmental air needs to be replaced every 1-2 weeks according to the specification.

[0004] CN201510870721.2 records an automatic film replacement device, which can realize automatic replacement of the filter membrane of the gaseous pollutant analyzer. The scheme can only replace the filter membrane of one gas. The scheme adopts a three-station mode (loading station, working station and unloading station), and the three membrane clamp holes on the rotating disc correspond to the loading station, the working station and the unloading station, that is, a plurality of membrane clamps are put into the loading cylinder at a time, the position of the rotating disc is adjusted by the driving of the stepping motor, the membrane clamp with new membrane falls into the rotating disc at the loading station, enters the working station, when the filter membrane needs to be replaced, the rotating disc is adjusted to the unloading station, and the release of the membrane clamp with used filter membrane is performed. The scheme has the following disadvantages:

[0005] 1. It is only suitable for automatic replacement of the filter membrane of one sampling gas path. The environmental air quality monitoring automatic station is equipped with four gaseous pollutant analyzers, namely sulfur dioxide analyzer, nitrogen dioxide analyzer, carbon monoxide analyzer and ozone analyzer. The automatic film replacement device of the existing scheme cannot provide automatic film replacement for the sampling pipe of the four analyzers.

[0006] 2. The introduction of the membrane clamp, the space of the loading cylinder is limited, and the number of membrane clamps that can be assembled is less than 20, that is, only 20 times of filter membrane replacement can be guaranteed. It cannot realize truly unmanned operation and maintenance.

[0007] The gaseous pollutant analyzer in the environmental air quality monitoring station needs to be replaced regularly, usually once every one to two weeks. The scheme has the following disadvantages:

[0008] 1. If it is completed by manual work, it greatly restricts the lengthening of the operation and maintenance interval period, and limits the number of station sites that can be operated and maintained by each operation and maintenance personnel.

[0009] 2. The membrane replacement interval is artificially subjective, which may cause the filter membrane to be seriously contaminated, even blocked, resulting in abnormal operation of the instrument and invalid data; when the air quality is excellent, the membrane is still clean, and the replacement of the membrane causes the loss of materials.

[0010] 3. The membrane replacement operation is not rigorous, which may cause air leakage and cause the data of the gaseous pollutant analyzer to be distorted. Practical new type content

[0011] In order to solve the above problems in the prior art, the dust filtering device of the gaseous pollutant analyzer is provided.

[0012] The purpose of the present application is achieved by the following technical solutions:

[0013] The dust filtering device of the gaseous pollutant analyzer comprises a filter membrane, both ends of the filter membrane are wound on a first rotating wheel and a second rotating wheel; the dust filtering device further comprises a plurality of filtering units, the filtering unit comprises:

[0014] A first pipeline and a second pipeline are arranged on the upper side and the lower side of the filter membrane, respectively;

[0015] A carrier and an elastic member are arranged on the first pipeline, and the elastic member is arranged between the carrier and a limiting member;

[0016] A limiting member and a guide member are arranged on the upper side of the elastic member and the carrier, and the first pipeline moves up and down along the guide member;

[0017] A driving module is arranged on the carrier and the elastic member, and the driving module is used to drive the carrier to move up and down.

[0018] Compared with the prior art, the present application has the following beneficial effects:

[0019] 1. Automatic operation;

[0020] The first pipeline is automatically driven to move up and down, so that the filter membrane can be automatically moved when it is loosened, and the gaseous pollutant can be automatically filtered when it is compressed;

[0021] Under the drive of the first wheel, the unused filter membrane is moved to the lower side of the first pipeline, and after the filtration is completed, it is automatically moved out of the lower side of the first pipeline;

[0022] 2. On-line leak detection is realized;

[0023] The electromagnetic valve upstream of the first pipeline inlet and the flow meter downstream of the second pipeline are used to realize the automatic leak detection function;

[0024] 3. Multiple channels are realized to work in parallel;

[0025] Multiple filter units are arranged in parallel and sequentially, so that the to-be-tested gas passes through multiple filter units at the same time and enters the downstream analysis. BRIEF DESCRIPTION OF DRAWINGS

[0026] The disclosure of the present application will become more readily understood by reference to the accompanying drawings. It will be readily understood to those skilled in the art that the drawings are not intended to limit the present application, and are merely intended to be illustrative. In the drawings:

[0027] Figure 1 is a structural schematic view of a dust filtering device of a gaseous pollutant analyzer according to an embodiment of the present application;

[0028] Figure 2 is a partial structural schematic view of a filtering device according to an embodiment of the present application;

[0029] Figure 3 is a partial perspective structural schematic view of a filtering device according to an embodiment of the present application. DETAILED DESCRIPTION

[0030] Figures 1-3 The following description describes optional specific embodiments of the present application to teach those skilled in the art how to implement and reproduce the present application. Some conventional aspects have been simplified or omitted in order to explain the technical solutions of the present application. Those skilled in the art should understand that variations or substitutions derived from these specific embodiments will be within the scope of the present application. Those skilled in the art should understand that the following features can be combined in various ways to form multiple variations of the present application. Therefore, the present application is not limited to the following optional specific embodiments, but is only limited by the claims and their equivalents.

[0031] Example 1:

[0032] Figure 1 A structural schematic view of a dust filtering device of a gaseous pollutant analyzer according to an embodiment of the present application is given, as shown in Figure 1 The dust filtering device of the gaseous pollutant analyzer includes:

[0033] Both ends of the filter membrane 26 are wound around the first rotating wheel 21 and the second rotating wheel 22, the first rotating wheel 21 is a driving wheel, and the second rotating wheel 22 is a driven wheel, so as to realize automatic movement of the filter membrane 26.

[0034] Multiple filter units 20, each filter unit 20 includes:

[0035] A first pipe 31 and a second pipe 32 are respectively arranged on the upper side and the lower side of the filter membrane 26,

[0036] As shown in Figures 2-3 The bearing 41 is arranged on the first pipe 31, and the elastic member 42 is arranged between the bearing 41 and the limiting member 44.

[0037] The limiting member 44 is arranged on the upper side of the elastic member 42 and the bearing 41, and the first pipe 31 moves up and down along the guide 45.

[0038] The driving module 43 is used for driving the bearing 41 to move up and down, so that when the driving module drives the bearing 41 and the first pipe 31 to move up, the first pipe 31 loosens the filter membrane 26, and the filter membrane 26 translates; when the elastic member 42 drives the first pipe 31 to move down, the bottom end of the first pipe 31 presses the filter membrane 26, and the filtering function is realized.

[0039] In order to reduce the structural complexity and improve the working reliability, further, the driving module 43 comprises a motor and a cam, the cam is fixed on the rotating shaft of the motor, and is arranged on the lower side of the bearing 41, the distance between the rotating shaft of the motor and the bearing 41 is adjusted by the rotation of the cam, so that the bearing 41 is driven to move vertically up, and the bearing 41 is driven to move vertically down under the elastic force of the elastic member 42.

[0040] In order to realize the sealing of the gas path, further, as shown in Figures 2-3 The filtering device further comprises a connecting pipe 33, the connecting pipe 33 is fixed on the upper side of the limiting member 44, and the upper end of the first pipe 31 and the connecting pipe 33 are kept sealed.

[0041] In order to reduce the structural complexity, further, as shown in Figures 2-3 The limiting member 44 and the guide 45 are shared, the first pipe 31 passes through the guide holes in the upper part and the lower part of the guide 45 respectively, and the elastic member 42 is arranged between the inner wall of the upper part and the upper wall of the bearing 41.

[0042] In order to prevent the fourth rotating wheel 24 from slipping, further, the filter membrane 26 between the first rotating wheel 21 and the second rotating wheel 22 passes around the third rotating wheel 23 and the fourth rotating wheel 24, and the surface of the fourth rotating wheel 24 is provided with a structure for increasing friction. As shown, a plurality of strip-shaped protrusions or point-shaped protrusions are arranged on the surface of the fourth rotating wheel 24, and the included angle between the extension direction of the strip-shaped protrusions and the rotation direction of the fourth rotating wheel 24 is not 0.

[0043] In order to accurately control the translation displacement of the filter membrane 26, further, a code disc is arranged on the fourth rotating wheel 24, and a photoelectric detection module is used for detecting the position of the code disc.

[0044] In order to exclude the interference of the outside on the filtering, further, as shown in Figure 1As shown, the filter device further comprises a box body 11, the first rotating wheel 21, the second rotating wheel 22 and the third rotating wheel 23 are arranged on the rear side of the box body 11, the fourth rotating wheel 24 is arranged on the bracket 25, and the bracket 25 is fixed on the rear side of the box body 11.

[0045] In order to realize automatic leak detection, further, the filter device further comprises a solenoid valve, a pump and a flow meter, the solenoid valve is arranged upstream of the inlet of the first pipeline 31, and the pump and the flow meter are arranged downstream of the outlet of the second pipeline 32.

[0046] Embodiment 2:

[0047] Application example of the dust filter device of the gaseous pollutant analyzer according to the embodiment 1 in air monitoring.

[0048] In this application example, as shown in the drawings, Figure 1 In the box body 11, four sets of filter units 20 are arranged in sequence. One end of the filter membrane 26 is wound around the first rotating wheel 21 (as a driving wheel), and the other end is wound around the second rotating wheel 22 (as a driven wheel). The filter membrane 26 also winds around the third rotating wheel 23 and the fourth rotating wheel 24. The first rotating wheel 21, the third rotating wheel 23 and the second rotating wheel 22 are arranged on the rear side of the shell 11, the second rotating wheel 22 is arranged on the bracket 25, and the bracket 25 is fixed on the rear side of the box body 11. The code disc is arranged on the fourth rotating wheel 24, the surface of the fourth rotating wheel 24 is provided with a plurality of strip-shaped protrusions, the extension direction of the strip-shaped protrusions is parallel to the central axis of the fourth rotating wheel 24, so as to improve the friction and prevent the filter membrane 26 from slipping on the fourth rotating wheel 24.

[0049] As shown in the drawings, Figures 2-3 In each filter unit, the limiting piece 44 and the guide piece 45 are shared, adopt a square box structure, and are fixed on the rear side of the box body 11. The upper part and the lower part of the limiting piece 44 are provided with through holes, the connecting pipe 33 is fixed at the upper end of the limiting piece 44 and communicates with the upper through hole. The upper end of the first pipeline 31 passes through the upper through hole and keeps sealed with the connecting pipe 33, and the lower end passes through the lower through hole and extends to the lower side of the limiting piece 44. The lower through hole serves as a guide hole, so that the first pipeline 31 can only move vertically up and down in the through hole. From top to bottom, the inner diameter of the first pipeline 31 increases. The annular sealing piece 35 (such as an O-ring) is arranged at the bottom end of the first pipeline 31.

[0050] The bearing 41 is in the shape of a flange and is fixedly arranged outside the first pipeline 31. The elastic member 42 is in the shape of a spring and is arranged between the upper inner wall and the upper wall of the bearing 41. The driving module 43 is in the shape of a combination of a motor and a cam, the upper wall of the cam contacts the lower wall of the bearing 41, when the motor rotates, the distance between the upper wall of the cam and the lower wall of the bearing 41 becomes larger, thereby driving the bearing 41 to vertically move upwards, the elastic member 42 is compressed, the lower end of the first pipeline 31 is lifted, and the filter membrane 26 is loosened. When the cam further rotates, the distance between the upper wall of the cam and the lower wall of the bearing 41 becomes smaller, under the driving of the elastic force of the elastic member 42, the bearing 41 vertically moves downwards, the lower end of the first pipeline 31 moves downwards, the annular sealing member 35 is pressed, the first pipeline 31 presses the filter membrane 26 and realizes sealing.

[0051] The electromagnetic valve is arranged upstream of the inlet of the communication pipe 33, the gas analyzer is arranged downstream of the second pipeline 32, and the air pump and the flow meter are arranged downstream of the gas analyzer.

[0052] The working mode of the filtering device is as follows:

[0053] After the last filtering is finished, the electromagnetic valve is closed, the motor in the driving module 43 rotates, the distance between the upper wall of the cam and the lower wall of the bearing 41 becomes larger, thereby driving the bearing 41 to vertically move upwards, the elastic member 42 is compressed, and the lower end of the first pipeline 31 is lifted, and the filter membrane 26 is loosened.

[0054] The first rotating wheel 21 drives the filter membrane 26 at the lower side of the first pipeline 31 to move leftwards, when the set displacement is determined through the code disc, the first rotating wheel 21 stops rotating, at this time, the filter membrane 26 originally at the lower side of the first pipeline 31 completes filtering and moves out, and at the same time, the unused filter membrane 26 moves to the lower side of the first pipeline 31, ready for the next filtering.

[0055] The cam further rotates, the distance between the upper wall of the cam and the lower wall of the bearing 41 becomes smaller, under the driving of the elastic force of the elastic member 42, the bearing 41 vertically moves downwards, the lower end of the first pipeline 31 moves downwards, the annular sealing member 35 presses the filter membrane 26, and the sealing between the first pipeline 31 and the filter membrane 26 is ensured.

[0056] The electromagnetic valve and the pump are opened, air passes through the communication pipe 33, the first pipeline 31, the filter membrane 26 and the second pipeline 32 in sequence, the filter membrane 26 filters gaseous pollutants in the air, the filtered air enters the gas analyzer, and the concentration of part of components such as sulfur dioxide is obtained.

[0057] When leakage needs to be detected, the first pipeline 31 presses the filter membrane 26, the electromagnetic valve is closed, and the pump continues to work, and the flow meter outputs a flow value.

[0058] If the flow is all less than or equal to 20ml / min, it is judged that the leakage detection is qualified, the electromagnetic valve is opened, and normal filtering is restored.

[0059] If the flow rate is > 20ml / min, it is judged that the leak detection fails, and the above first pipeline 31 is moved up and down repeatedly, and the filter membrane 26 is pressed again.

[0060] If the flow rate is ≤ 20ml / min, it is judged that the leak detection is qualified, and the electromagnetic valve is opened.

[0061] If the flow rate is still > 20ml / min, it is judged that the system fails, the electromagnetic valve is opened to restore normal filtration, but the filter membrane translation result is marked as a fault bit upload.

[0062] In the above process, the vertical moving time of the first pipeline 31 (i.e. the filter membrane 26 replacement time) can be selected as a fixed period, or the next vertical moving time can be determined according to the obtained particulate matter content.

[0063] Example 3:

[0064] According to the application example of the dust filtering device of the gaseous pollutant analyzer in air monitoring according to the embodiment 1 of the utility model, different from the embodiment 2 is:

[0065] 1. The driving module 43 adopts the combination of motor and screw rod, so as to drive the vertical up and down movement of the bearing 41.

[0066] 2. The surface of the fourth rotating wheel 24 is provided with a plurality of point protrusions, so as to improve the friction force and prevent the filter membrane 26 and the fourth rotating wheel 24 from slipping.

[0067] 3. The limiting piece 44 and the guide piece 45 are separately arranged, and the guide piece 45 adopts the vertical straight line guide rail. It is ensured that the first pipeline 31 can only move vertically.

Claims

1. A dust filter device for a gaseous pollutant analyzer, comprising a filter membrane, the two ends of which are respectively wound around a first rotating wheel and a second rotating wheel; characterized in that: The dust filtering device further comprises a plurality of filtering units, each of which comprises: a first pipe and a second pipe, wherein the first pipe and the second pipe are respectively arranged on the upper side and the lower side of the filter membrane; a bearing member and an elastic member, wherein the bearing member is arranged on the first pipe, and the elastic member is arranged between the bearing member and the limiting member; a limiting member and a guiding member, wherein the limiting member is arranged on the upper side of the elastic member and the bearing member, and the first pipe moves up and down along the guiding member; A driving module is used to drive the supporting member to move up and down.

2. The dust filtering device for the gaseous pollutant analyzer according to claim 1, characterized in that: The driving module includes a motor and a cam. The cam is fixed on the motor shaft and is arranged on the lower side of the bearing.

3. The dust filtering device for the gaseous pollutant analyzer according to claim 1, characterized in that: The filtering device further includes a connecting pipe, which is fixed on the upper side of the limiting member, and the upper end of the first pipeline and the connecting pipe are sealed.

4. The dust filtering device for the gaseous pollutant analyzer according to claim 1 or 3, characterized in that: The limiting member and the guide member are shared, the first pipe passes through the guide holes in the upper part and the lower part of the guide member respectively, and the elastic member is arranged between the upper inner wall and the upper wall of the bearing member.

5. The dust filtering device for the gaseous pollutant analyzer according to claim 4, characterized in that: The limiting member is in a rectangular ring shape.

6. The dust filtering device for the gaseous pollutant analyzer according to claim 1, characterized in that: The filter membrane between the first rotating wheel and the second rotating wheel passes around the third rotating wheel and the fourth rotating wheel, and a structure for increasing friction is provided on the surface of the fourth rotating wheel.

7. The dust filtering device for the gaseous pollutant analyzer according to claim 6, characterized in that: The surface of the fourth rotating wheel is provided with a plurality of strip-shaped protrusions or dot-shaped protrusions, and the angle between the extending direction of the strip-shaped protrusions and the rotation direction of the fourth rotating wheel is not 0; A code disk is provided on the fourth rotating wheel, and a photoelectric detection module is used to detect the position of the code disk.

8. The dust filtering device for the gaseous pollutant analyzer according to claim 7, characterized in that: An O-ring is provided at the bottom end of the first pipe.

9. The dust filtering device for the gaseous pollutant analyzer according to claim 6, characterized in that: The filtering device further includes a box body, and the first rotating wheel, the second rotating wheel, the third rotating wheel and the fourth rotating wheel are arranged on the rear side of the box body.

10. The dust filtering device for a gaseous pollutant analyzer according to claim 1, characterized in that: The filtering device further includes a solenoid valve, a pump, and a flow meter. The solenoid valve is arranged upstream of the first pipeline inlet, and the pump and the flow meter are arranged downstream of the second pipeline outlet.

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