Air quality detection device

Abstract

The present invention relates to the field of environmental detection technology. The present application discloses an air quality detection device, including a matching protrusion, a limit slide bar movably installed inside the matching protrusion, the top of the limit slide bar is fixedly connected to the top of the inner wall of the shell, a telescopic machine is fixedly installed on the back of the side plate, one end of the telescopic machine is fixedly connected to the inner wall of the shell, and an annular stepped hole is opened on the top of the rotating plate, and a first filter screen is clamped inside the annular stepped hole. The filter screen aperture used on the first filter screen is greater than 2.5 microns, and the second filter screen uses a filter screen that can filter PM2.5 pollutants, so that pollutants with a diameter greater than 2.5 microns can be filtered out first, and in the subsequent process of air passing through the second filter screen, PM2.5 can be filtered and retained above the second filter screen, thereby avoiding the problem that pollutants with a specification greater than PM2.5 are filtered by the second filter screen and retained on the surface during the detection process, affecting the final detection result and causing a large error, thereby improving the practicality of the device.

Description

Technical Field

[0001] The present application relates to the technical field of environmental detection, and in particular to an air quality detection device. Background Art

[0002] Air quality is one of the important parameters of environmental indicators, among which the concentration of PM2.5 is the most important indicator. In order to obtain this important indicator, an air quality detection device is used. The traditional air quality detection device consists of an air supply device, an air supply channel, a detachable bracket, and a filter. When in use, the air supply device sends the outside air into the air supply channel and passes through the filter. The filter can filter out PM2.5 in the airflow and retain it on the surface of the filter. After a period of time, the operator will disassemble the bracket with the filter installed, collect and weigh the particles attached to the surface of the filter, so as to obtain the concentration of PM2.5. This detection method has obvious hysteresis and cannot always obtain the PM2.5 concentration in the air. In addition, the filter surface can filter out particles larger than PM2.5, resulting in the final PM2.5 concentration being greater than the actual concentration. In this regard, the present application document proposes an air quality detection device to solve the above-mentioned problems. Summary of the invention

[0003] The present application proposes an air quality detection device, which has the advantage of eliminating the interference of particles with a diameter greater than PM2.5 on the results, and is used to solve the problem that the detection result data is larger than the actual data.

[0004] To achieve the above-mentioned purpose, the present application adopts the following technical scheme: an air quality detection device, comprising a shell, a warehouse door is provided on the front side of the shell, a flow guide device is fixedly installed at the middle and upper position on both sides of the inner wall of the shell, a travel device is movably installed inside the flow guide device, an air intake device is fixedly installed on the top of the flow guide device, an exhaust hole is opened on the left side of the outer surface of the shell, the exhaust hole is connected with the flow guide device, a detection device is fixedly installed on the bottom of the flow guide device, an air supply port is opened on the top of the outer surface of the shell, the air supply port is connected with the air intake device, and during the operation of the air supply equipment, the outside air is sent into the interior of the first air intake pipe through the air supply port.

[0005] Further, the flow guide device includes a first flow guide bin, a second flow guide bin is fixedly installed at a position near the top of the end of the first flow guide bin, the inner cavities of the first flow guide bin and the second flow guide bin are connected, the top and bottom of the first flow guide bin are each provided with a first flow guide hole, the top and bottom of the second flow guide bin are each provided with a second flow guide hole, both sides of the second flow guide bin are provided with a first travel hole, the first travel hole cooperates with the travel device, both sides of the first flow guide bin are provided with a vibration hole near the front end, the number of the vibration holes is three groups, a collecting device is movably installed inside the vibration hole, and there is a margin between the vibration hole and the collecting device, so that the collecting device can move in the up and down directions.

[0006] Specifically, a clamp is connected at a position near the front end of the bottom of the first guide bin to collect dust dropped from the collecting device.

[0007] Furthermore, the collecting device includes three collecting nets, and the collecting nets can collect particulate matter passing through the inside of the first guide bin.

[0008] Specifically, connecting rods are fixedly installed at positions near the top of both sides of the collection net, a transmission rod is fixedly installed at one end of the connecting rod, a vibrating ratchet is arranged at a position near the front end of the top of the transmission rod, and a reset spring is arranged at the bottom of the connecting rod, and the reset spring drives the connecting rod to reset;

[0009] Specifically, the connecting rod is located inside the vibration hole, the bottom of the reset spring is snap-connected with the bottom of the vibration hole, and the collecting net extends into the inside.

[0010] Furthermore, the stroke device includes a first stroke seat, a cavity is provided at the front end of the first stroke seat, and a bottom hole is opened at the bottom of the cavity, a second stroke seat is fixedly installed at a position near the top of the end of the first stroke seat, a rectangular hole is opened at the top of the second stroke seat, and a rotating plate is provided inside the rectangular hole through a spring sleeve, and the rotating plate will rotate counterclockwise after losing the limiting effect of the second guide bin.

[0011] Specifically, side plates are fixedly installed on both sides of the second stroke seat near the end, and the side plates extend out through the first stroke hole. A side arm is fixedly installed on one end of the side plate, and a top plate is fixedly installed on the top of the side arm near the front end. A contact ratchet is provided at the bottom of the top plate. During the lateral movement of the side arm and the top plate, the contact ratchet will collide with the vibrating ratchet, thereby causing the transmission rod to be in a vibrating state, and driving the collecting net to vibrate synchronously through the transmission of the connecting rod.

[0012] Specifically, a push rod is provided on the front movable sleeve of the side plate, a torsion bar is provided on the front movable sleeve of the push rod, a travel plate is fixedly installed on one end of the torsion bar, a third guide hole is opened on the front side of the travel plate near the top, and matching protrusions are fixedly installed on both sides of the travel plate near the top. When the side arm and the top plate move laterally, the travel plate will be driven to move at the same time, and the travel plate can only move longitudinally under the limiting action of the matching protrusions.

[0013] Specifically, a limit slide bar is movably installed inside the mating protrusion, the top of the limit slide bar is fixedly connected to the top of the inner wall of the shell, and a telescopic machine is fixedly installed on the back of the side plate, and one end of the telescopic machine is fixedly connected to the inner wall of the shell;

[0014] Specifically, an annular stepped hole is formed on the top of the rotating plate, and a first filter screen is clamped inside the annular stepped hole;

[0015] Specifically, the contact ratchet is located above the vibrating ratchet, and the contact ratchet will come into contact with the vibrating ratchet during the movement of the side arm.

[0016] Further, the air intake device includes a first air intake pipe and a second air intake pipe, the top of the first air intake pipe is connected to the air supply port, a first bypass pipe is arranged on the right side of the first air intake pipe, the first bypass pipe is connected to the first air intake pipe, and a second bypass pipe is arranged on the left side of the outer surface of the second air intake pipe, the second bypass pipe is connected to the second air intake pipe;

[0017] Specifically, the axes of the first bypass pipe and the second bypass pipe are located on the same center line, the stroke plate is located between the first bypass pipe and the second bypass pipe, and in the initial state, the third guide hole is in a corresponding state to the first bypass pipe and the second bypass pipe;

[0018] Specifically, the bottom of the first air inlet pipe is connected to and communicates with the first air guide hole located above, and the bottom of the second air inlet pipe is connected to and communicates with the second air guide hole located above.

[0019] Further, the detection device includes a U-shaped tube, the opening at the left end of the U-shaped tube is connected to and communicates with the first guide hole located below, the opening at the right end of the U-shaped tube is connected to and communicates with the second guide hole located below, a second travel hole is provided on the right side of the outer surface of the U-shaped tube, an inner sleeve is movably installed on the right side of the inner cavity of the U-shaped tube, a mounting protrusion is fixedly installed on the inner wall of the inner sleeve near the bottom, a mounting hole is provided on the top of the mounting protrusion, a second filter is placed inside the mounting hole, when the number of particulate matter attached to the top of the second filter increases, its resistance to the gas increases, and under this action, the second filter is subjected to an increased force acting downward.

[0020] Specifically, a limit slider is fixedly installed at a position on the outer surface of the inner sleeve corresponding to the installation protrusion, the limit slider extends from the inside of the second stroke hole, a detection slide bar is movably installed inside the limit slider, a pressure detector is fixedly installed at a position on the outer surface of the detection slide bar below the limit slider, a detection spring is clamped at a position on the outside of the detection slide bar at the bottom of the limit slider, and the bottom of the detection spring is connected to the pressure detector, and the pressure detector can detect the elastic force stored in the detection spring at any time.

[0021] Specifically, a fixed base is fixedly installed at the bottom of the detection slide bar, and the fixed base is fixedly installed at the bottom of the inner wall of the shell. Under the limiting action of the detection slide bar, the limiting slider can only move in the longitudinal direction.

[0022] This application has the following beneficial effects:

[0023] The device can detect the concentration of dust and particulate matter in the air at any time. There is no need to collect and weigh dust and particulate matter, which avoids the lag problem of detection results obtained by traditional equipment. The device can also avoid excessive accumulation of particulate matter on the top surface of the first filter, which leads to enhanced filtration capacity and causes the final detection data of PM2.5 to be less than the actual data, thereby improving the detection accuracy of the device. In addition, the device can collect dust and particulate matter that is larger than the detection specifications, thereby judging the content of pollutants in the air that are higher than the requirements. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] The accompanying drawings, which constitute a part of the specification, illustrate embodiments disclosed in the present application and, together with the description, serve to explain the principles disclosed in the present application.

[0025] The present disclosure may be more clearly understood from the following detailed description with reference to the accompanying drawings, in which:

[0026] Figure 1 It is a structural diagram of the present invention;

[0027] Figure 2 It is the internal structure diagram of the present invention;

[0028] Figure 3 It is a cross-sectional view of the structure of the present invention;

[0029] Figure 4 This is a diagram of the structure guide device of the present invention;

[0030] Figure 5 The structure of the present invention Figure 4 Enlarged view of point A in the middle;

[0031] Figure 6 It is a cross-sectional view of the flow guiding device of the structure of the present invention;

[0032] Figure 7 It is a diagram of the structure collection device of the present invention;

[0033] Figure 8 It is a structural stroke device diagram of the present invention;

[0034] Fig. 9 It is a cross-sectional view of the structural stroke device of the present invention;

[0035] Fig.10 This is a diagram of the air intake device of the present invention;

[0036] Fig.11 It is a cross-sectional view of the air intake device of the present invention;

[0037] Fig.12 This is a diagram of the structural detection device of the present invention;

[0038] Fig.13 It is a cross-sectional view of the structure detection device of the present invention;

[0039] Fig.14 The structure of the present invention Fig.13 Enlarged view of point B in the middle;

[0040] Fig.15 It is a schematic diagram of the lateral movement of the structural stroke device of the present invention.

[0041] In the figure; 1, shell; 2, door; 3, guide device; 31, first guide bin; 32, second guide bin; 33, first guide hole; 34, second guide hole; 35, first stroke hole; 36, vibration hole; 37, collection device; 371, collection net; 372, connecting rod; 373, transmission rod; 374, vibration ratchet; 375, return spring; 4, stroke device; 41, first stroke seat; 42, bottom hole; 43, second stroke seat; 44, rotating plate; 45, side plate; 46, side arm; 47, top plate; 48, contact ratchet; 49, push rod; 401, torsion bar; 402 , stroke plate; 403, third guide hole; 404, matching protrusion; 405, limit slide bar; 406, telescopic machine; 407, first filter; 5, air intake device; 51, first air intake pipe; 52, second air intake pipe; 53, first bypass pipe; 54, second bypass pipe; 6, exhaust hole; 7, detection device; 71, U-shaped tube; 72, second stroke hole; 73, inner sleeve; 74, mounting protrusion; 75, mounting hole; 76, second filter; 77, limit slide bar; 78, detection slide bar; 79, pressure detector; 701, detection spring; 702, fixed base; 8, air outlet. DETAILED DESCRIPTION

[0042] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0043] An air quality detection device, see Figure 1-Figure 3 and Figure 10-11 , comprising a shell 1, a door 2 is provided on the front of the shell 1, a flow guide device 3 is fixedly installed at the upper middle position on both sides of the inner wall of the shell 1, a travel device 4 is movably installed inside the flow guide device 3, an air intake device 5 is fixedly installed on the top of the flow guide device 3, an exhaust hole 6 is opened on the left side of the outer surface of the shell 1, the exhaust hole 6 is connected with the flow guide device 3, a detection device 7 is fixedly installed on the bottom of the flow guide device 3, an air supply port 8 is opened on the top of the outer surface of the shell 1, the air supply port 8 is connected with the air intake device 5, and during the operation of the air supply device, the outside air is sent into the interior of the first air intake pipe 51 through the air supply port 8.

[0044] See also Figure 4-Figure 6 The flow guide device 3 includes a first flow guide bin 31, a second flow guide bin 32 is fixedly installed at a position near the top of the end of the first flow guide bin 31, the inner cavities of the first flow guide bin 31 and the second flow guide bin 32 are connected, the top and bottom of the first flow guide bin 31 are provided with a first flow guide hole 33, the top and bottom of the second flow guide bin 32 are provided with a second flow guide hole 34, both sides of the second flow guide bin 32 are provided with a first travel hole 35, the first travel hole 35 cooperates with the travel device 4, both sides of the first flow guide bin 31 are provided with a vibration hole 36 near the front end, the number of the vibration holes 36 is three groups, and a collecting device 37 is movably installed inside the vibration hole 36, and there is a margin between the vibration hole 36 and the collecting device 37, so that the collecting device 37 can move in the up and down directions.

[0045] See also Figure 4-Figure 6 A portion 38 is clamped at the bottom of the first guide bin 31 near the front end, and 38 can collect dust dropped from the collecting device 37 .

[0046] See also Figure 6-Figure 7 The collecting device 37 includes three collecting nets 371 , and the collecting nets 371 can collect particulate matter passing through the inside of the first guide chamber 31 .

[0047] See also Figure 7, connecting rods 372 are fixedly installed at positions near the top on both sides of the collecting net 371, a transmission rod 373 is fixedly installed at one end of the connecting rod 372, a vibration ratchet 374 is arranged at a position near the front end of the top of the transmission rod 373, and a reset spring 375 is arranged at the bottom of the connecting rod 372, and the reset spring 375 drives the connecting rod 372 to reset;

[0048] See also Figure 6-Figure 7 The connecting rod 372 is located inside the vibration hole 36 , the bottom of the return spring 375 is engaged with the bottom of the vibration hole 36 , and the collecting net 371 extends into the interior of 38 .

[0049] When the telescopic machine 406 is extended and retracted and drives the top plate 47 to reciprocate, since the contact ratchet 48 is located above the vibrating ratchet 374, the contact ratchet 48 of the side arm 46 will come into contact with the vibrating ratchet 374 during the movement, thereby generating vibration, and under the conduction action of the connecting rod 372, the collecting net 371 is driven to vibrate synchronously, so that the dust and particulate matter attached to the surface of the collecting net 371 are shaken off to the inside of 38 and collected, avoiding the problem of airflow obstruction caused by excessive dust attached to the surface of the collecting net 371, and also avoiding the problem of dust falling off due to vibration polluting the inside of the outer shell 1, thereby improving the reliability of the device. In addition, it is also convenient for the operator to weigh the dust and particulate matter inside 38, so as to judge the content of pollutants in the air with specifications higher than PM2.5, further improving the practicality of the device.

[0050] See also Figure 6 and Figure 8-Figure 9 The stroke device 4 includes a first stroke seat 41, a cavity is provided at the front end of the first stroke seat 41, and a bottom hole 42 is opened at the bottom of the cavity, and a second stroke seat 43 is fixedly installed at a position near the top of the end of the first stroke seat 41, and a rectangular hole is opened at the top of the second stroke seat 43, and a rotating plate 44 is provided inside the rectangular hole through a spring sleeve. The rotating plate 44 will rotate counterclockwise after losing the limiting effect of the second guide chamber 32.

[0051] See also Figure 7-Figure 9 A side plate 45 is fixedly installed on both sides of the second stroke seat 43 near the end, and the side plate 45 extends out through the first stroke hole 35. A side arm 46 is fixedly installed at one end of the side plate 45, and a top plate 47 is fixedly installed on the top of the side arm 46 near the front end. A contact ratchet 48 is provided at the bottom of the top plate 47. When the side arm 46 and the top plate 47 are moving laterally, the contact ratchet 48 will collide with the vibrating ratchet 374, so that the transmission rod 373 is in a vibrating state, and the collection net 371 is driven to vibrate synchronously through the transmission of the connecting rod 372.

[0052] See also Figure 8-Figure 9A push rod 49 is provided on the front movable sleeve of the side plate 45, and a torsion bar 401 is provided on the front movable sleeve of the push rod 49. A travel plate 402 is fixedly installed on one end of the torsion bar 401. A third guide hole 403 is opened on the front side of the travel plate 402 near the top, and matching protrusions 404 are fixedly installed on both sides of the travel plate 402 near the top. When the side arm 46 and the top plate 47 move laterally, the travel plate 402 will be driven to move at the same time, and the travel plate 402 can only move longitudinally under the limiting action of the matching protrusion 404.

[0053] See also Figure 2 and Figure 8-Figure 9 A limit slide bar 405 is installed in cooperation with the internal movement of the protrusion 404, the top of the limit slide bar 405 is fixedly connected to the top of the inner wall of the shell 1, and a telescopic machine 406 is fixedly installed on the back of the side plate 45, and one end of the telescopic machine 406 is fixedly connected to the inner wall of the shell 1;

[0054] See also Figure 8-Figure 9 The top of the rotating plate 44 is provided with an annular stepped hole, and the first filter screen 407 is clamped inside the annular stepped hole;

[0055] See also Figure 7-Figure 9 The contact ratchet 48 is located above the vibrating ratchet 374 , and the contact ratchet 48 will come into contact with the vibrating ratchet 374 during the movement of the side arm 46 .

[0056] See also Figure 3 and Figure 10-11 The air intake device 5 includes a first air intake pipe 51 and a second air intake pipe 52. The top of the first air intake pipe 51 is connected to the air supply port 8. A first bypass pipe 53 is provided on the right side of the first air intake pipe 51. The first bypass pipe 53 is connected to the first air intake pipe 51. A second bypass pipe 54 is provided on the left side of the outer surface of the second air intake pipe 52. The second bypass pipe 54 is connected to the second air intake pipe 52.

[0057] See also Figure 9-11 , the axes of the first bypass pipe 53 and the second bypass pipe 54 are located on the same center line, the travel plate 402 is located between the first bypass pipe 53 and the second bypass pipe 54, and in the initial state, the third guide hole 403 is in a corresponding state with the first bypass pipe 53 and the second bypass pipe 54;

[0058] See also Figure 6 and Figure 10-11 The bottom of the first air inlet pipe 51 is connected to and penetrates the first air guide hole 33 located above, and the bottom of the second air inlet pipe 52 is connected to and penetrates the second air guide hole 34 located above.

[0059] When the number of large-diameter particles accumulated on the top of the first filter 407 increases due to filtration, the filtering capacity of the first filter 407 is enhanced, so that part of the PM2.5 pollutants will also be filtered out by the first filter 407, causing the weight of the PM2.5 filtered out by the second filter 76 to be less than the actual weight, resulting in an error in the final air quality value. At this time, the telescopic machine 406 can be controlled to perform periodic telescopic expansion and contraction to drive the first stroke seat 41 and the second stroke seat 43 to move leftward in the horizontal direction, so that the rotating plate 44 enters the first flow guide chamber 31 from the inside of the second flow guide chamber 32, and finally the rotating plate 44 is located on the left side of the first flow guide hole 33. Since a rectangular hole is provided on the top of the second stroke seat 43, and a rotating plate 44 is provided inside the rectangular hole through a spring sleeve, the rotating plate 44 is rotated out of the rectangular hole on the top of the second stroke seat 43. At the same time, during the lateral movement of the side plate 45 and the side arm 46, the push rod 49 drives the stroke plate 402 to move upward, so that the first bypass pipe 53 and the second bypass pipe 5 4 is misaligned with the stroke plate 402 and is in a blocked state. At this time, after the air flow entering through the air supply port 8 and the first air inlet pipe 51 reaches the first stroke seat 41, the air pressure inside the U-shaped tube 71 is stable and the end is in a closed state, so that the gas cannot enter the interior of the U-shaped tube 71. The air flow entering the first stroke seat 41 can only enter through the front end of the second guide chamber 32 and impact the bottom surface of the push rod 49, so that the dust attached to the front of the push rod 49 falls off, and driven by the air flow, the fallen dust moves inside the first guide chamber 31 and adheres to the surface of the collecting device 37. At this time, the first filter 407 drives the first stroke seat 41 and the second stroke seat 43 to reset, and the rotating plate 44 is reset under the push of the inner wall of the second guide chamber 32. At this time, the top of the push rod 49 is cleaned and will not filter PM2.5, avoiding excessive accumulation of particulate matter on the top surface of the first filter 407, resulting in enhanced filtering capacity and causing the final detection data of PM2.5 to be smaller than the actual data, thereby improving the detection accuracy of the device.

[0060] See also Figure 12-14 The detection device 7 includes a U-shaped tube 71, the left end opening of the U-shaped tube 71 is connected to and penetrates the first guide hole 33 located below, the right end opening of the U-shaped tube 71 is connected to and penetrates the second guide hole 34 located below, a second stroke hole 72 is opened on the right side of the outer surface of the U-shaped tube 71, an inner sleeve 73 is movably installed on the right side of the inner cavity of the U-shaped tube 71, a mounting protrusion 74 is fixedly installed on the inner wall of the inner sleeve 73 near the bottom, a mounting hole 75 is opened on the top of the mounting protrusion 74, a second filter screen 76 is placed inside the mounting hole 75, when the number of particles attached to the top of the second filter screen 76 increases, its resistance to the gas increases, under this action, the second filter screen 76 is subjected to an increased force acting downward.

[0061] See also Figure 12-14A limit slider 77 is fixedly installed on the outer surface of the inner sleeve 73 at a position corresponding to the mounting protrusion 74. The limit slider 77 extends from the inside of the second stroke hole 72. A detection slide bar 78 is movably installed inside the limit slider 77. A pressure detector 79 is fixedly installed on the outer surface of the detection slide bar 78 at a position below the limit slider 77. A detection spring 701 is clamped at a position outside the detection slide bar 78 at the bottom of the limit slider 77. The bottom of the detection spring 701 is connected to the pressure detector 79. The pressure detector 79 can detect the elastic force stored in the detection spring 701 at any time.

[0062] See also Figure 3 and Figure 12-14 A fixed base 702 is fixedly installed at the bottom of the detection slide bar 78, and the fixed base 702 is fixedly installed at the bottom of the inner wall of the shell 1. Under the limiting action of the detection slide bar 78, the limiting slider 77 can only move in the longitudinal direction.

[0063] When it is necessary to detect the content of particles with smaller diameters in the air, such as PM2.5, which represents the concentration of dust or floating dust with a diameter less than or equal to 2.5 microns in the ambient air, the filter aperture used on the first filter 407 is greater than 2.5 microns, and the second filter 76 uses a filter that can filter PM2.5 pollutants, so that pollutants with diameters greater than 2.5 microns can be filtered out first, ensuring that pollutants with specifications greater than PM2.5 in the air after the first filtration, and in the subsequent process of air passing through the second filter 76, PM2.5 can be filtered and retained above the second filter 76, thereby avoiding the problem that pollutants with specifications greater than PM2.5 are filtered by the second filter 76 and retained on the surface during the detection process, affecting the final detection results and causing large errors, thereby improving the practicality of the device.

[0064] As more and more PM2.5 particles are filtered out from the top of the second filter 76, the resistance encountered by the flowing air when passing through the second filter 76 becomes greater, causing the second filter 76 to be subjected to a vertical downward force. When the force increases, the second filter 76 moves, and the detection spring 701 is compressed and stores elastic potential energy. At the same time, the pressure detector 79 in contact with the detection spring 701 will constantly detect the size of the elastic force stored in the detection spring 701, and the PM2.5 concentration in the air is proportional to the rate of change of the elastic potential energy stored in the detection spring 701, so that the device can constantly detect the PM2.5 concentration in the air. Traditional devices require the filter to be removed regularly and the particles filtered on the surface of the filter to be collected and loaded to reflect the PM2.5 concentration in the air in the past time period. The final result has a lag, and the device involved in the present application document avoids this well, thereby improving the practicality of the device.

[0065] The method of use of the present invention is as follows:

[0066] During use, the air supply device delivers external air into the interior of the first air inlet pipe 51 through the air supply port 8. At this time, the bottom of the first air inlet pipe 51 is blocked by the first stroke seat 41, so that the airflow passes through the first bypass pipe 53, the third guide hole 403 and the second bypass pipe 54 to enter the interior of the second air inlet pipe 52. Subsequently, the airflow continues to move and passes through the second guide hole 34 and the first filter 407, thereby performing the first filtration to filter out dust and particulate matter with a specification larger than the required size. After the first filtration, the airflow will enter the interior of the U-shaped tube 71 and pass through the second filter 76, thereby filtering out dust and particulate matter with a specification smaller than the required size in the airflow. The airflow that has passed the second filtration enters the interior of the first guide bin 31 through the opening at the other end of the U-shaped tube 71 and leaves from the exhaust hole 6.

[0067] When it is necessary to detect the content of particles with smaller diameters in the air, such as PM2.5, which represents the concentration of dust or floating dust with a diameter less than or equal to 2.5 microns in the ambient air, the filter pore size used on the first filter 407 is greater than 2.5 microns, and the second filter 76 uses a filter that can filter PM2.5 pollutants, so that pollutants with a diameter greater than 2.5 microns can be filtered out first, ensuring that pollutants with a specification greater than PM2.5 in the air after the first filtration, and PM2.5 can be filtered and retained in the second filter during the subsequent air passing through the second filter 76. Above the filter 76, as more and more PM2.5 particles are filtered out from the top of the second filter 76, the resistance encountered by the flowing air when passing through the second filter 76 becomes greater, causing the second filter 76 to be subjected to a vertical downward force. When the force increases, the second filter 76 moves, and the detection spring 701 is compressed and stores elastic potential energy. At the same time, the pressure detector 79 in contact with the detection spring 701 will constantly detect the size of the elastic force stored in the detection spring 701, and the PM2.5 concentration in the air is proportional to the rate of change of the elastic potential energy stored in the detection spring 701, thereby The device can detect the PM2.5 concentration in the air at any time, while the traditional device needs to take out the filter at regular intervals and collect the particulate matter filtered on the surface of the filter to reflect the PM2.5 concentration in the air in the past time period. The final result has a lag, and the device involved in the present application document avoids this well. When the large-diameter particulate matter accumulated on the top of the first filter 407 due to filtration increases, the filtering capacity of the first filter 407 is enhanced, so that part of the PM2.5 pollutants will also be filtered out by the first filter 407, causing the second filter 76 to filter out. The weight of the PM2.5 that comes out is less than the actual weight, resulting in an error in the final air quality value. At this time, the telescopic machine 406 can be controlled to perform periodic telescopic expansion and contraction, driving the first stroke seat 41 and the second stroke seat 43 to move horizontally to the left, so that the rotating plate 44 enters the first flow guide chamber 31 from the inside of the second flow guide chamber 32. Finally, the rotating plate 44 is located on the left side of the first flow guide hole 33. Since a rectangular hole is opened on the top of the second stroke seat 43, and a rotating plate 44 is arranged inside the rectangular hole through a spring sleeve, the rotating plate 44 is rotated out of the rectangular hole on the top of the second stroke seat 43, as shown in FIG. Fig.15As shown, at the same time, when the side plate 45 and the side arm 46 move laterally, the push rod 49 will drive the stroke plate 402 to move upward, so that the first bypass pipe 53, the second bypass pipe 54 and the stroke plate 402 are misaligned and in a blocked state. At this time, after the airflow entering through the air supply port 8 and the first air inlet pipe 51 reaches the first stroke seat 41, the air pressure inside the U-shaped tube 71 is stable and the end is in a closed state, so that the gas cannot enter the interior of the U-shaped tube 71. The airflow entering the interior of the first stroke seat 41 can only enter through the front end of the second guide bin 32 and impact the bottom surface of the push rod 49, so that the dust attached to the front of the push rod 49 falls off, and driven by the airflow, the detached dust moves inside the first guide bin 31 and adheres to the surface of the collecting device 37. At this time, the first filter screen 407 drives the first stroke seat 41 and the second stroke seat 43 to reset, and the rotating plate 44 in the second guide bin 5 will no longer be filtered. When the telescopic machine 406 is extended and retracted and drives the top plate 47 to reciprocate, since the contact ratchet 48 is located above the vibrating ratchet 374, the contact ratchet 48 of the side arm 46 will contact the vibrating ratchet 374 during the movement, thereby generating vibration, and under the conduction of the connecting rod 372, the collecting net 371 is driven to vibrate synchronously, so that the dust and particulate matter attached to the surface of the collecting net 371 are shaken off to the inside of 38 and collected, avoiding the problem of airflow obstruction caused by excessive dust attached to the surface of the collecting net 371, and also avoiding the problem of dust falling off due to vibration polluting the inside of the outer shell 1, thereby improving the reliability of the device. In addition, it is also convenient for operators to weigh the dust and particulate matter inside 38, so as to judge the content of pollutants in the air with specifications higher than PM2.5.

Claims

1. An air quality detection device, characterized in that: The invention comprises a shell (1), wherein a door (2) is provided on the front of the shell (1), a flow guide device (3) is fixedly installed at a position slightly above the middle of both sides of the inner wall of the shell (1), a travel device (4) is movably installed inside the flow guide device (3), an air intake device (5) is fixedly installed on the top of the flow guide device (3), an exhaust hole (6) is opened on the left side of the outer surface of the shell (1), the exhaust hole (6) is connected to the flow guide device (3), and a detection device (7) is fixedly installed on the bottom of the flow guide device (3), wherein the exhaust hole (6) is connected to the flow guide device (3), and the exhaust hole (6) is connected to the exhaust hole (6) and the exhaust hole (6) is connected to the exhaust hole (3). The outer surface of the housing (1) is provided with an air supply port (8) at the top, the air supply port (8) being connected to the air intake device (5), the flow guide device (3) comprising a first flow guide chamber (31), a second flow guide chamber (32) being fixedly mounted at a position close to the top of the end of the first flow guide chamber (31), the inner cavities of the first flow guide chamber (31) and the second flow guide chamber (32) being connected, the top and bottom of the first flow guide chamber (31) both being provided with a first flow guide hole (33), the top and bottom of the second flow guide chamber (32) both being provided with a second flow guide hole (33), and the top and bottom of the second flow guide chamber (32) both being provided with a second flow guide hole (33). The second flow guide chamber (32) has a second flow guide hole (34), first travel holes (35) are provided on both sides of the second flow guide chamber (32), the first travel holes (35) cooperate with the travel device (4), the travel device (4) comprises a first travel seat (41), a cavity is provided at the front end of the first travel seat (41), and a bottom hole (42) is provided at the bottom of the cavity, a second travel seat (43) is fixedly installed at a position close to the top of the end of the first travel seat (41), and a rectangular hole is provided at the top of the second travel seat (43), and the rectangular hole is provided at the bottom of the first travel seat (41). A rotating plate (44) is provided inside the shaped hole via a spring sleeve, side plates (45) are fixedly mounted at positions near the ends on both sides of the second stroke seat (43), the side plates (45) extend through the first stroke hole (35), a side arm (46) is fixedly mounted at one end of the side plate (45), a top plate (47) is fixedly mounted at a position near the front end of the top of the side arm (46), a contact ratchet (48) is provided at the bottom of the top plate (47), and a push rod (49) is provided on the front movable sleeve of the side plate (45).

2. An air quality detection device according to claim 1, characterized in that: Vibration holes (36) are provided at positions close to the front end on both sides of the first flow guide chamber (31), the number of the vibration holes (36) is three groups, and a collection device (37) is movably installed inside the vibration holes (36).

3. An air quality detection device according to claim 2, characterized in that: The collecting device (37) comprises a collecting net (371), the number of the collecting nets (371) being three, connecting rods (372) being fixedly mounted at positions close to the tops on both sides of the collecting nets (371), a transmission rod (373) being fixedly mounted at one end of the connecting rod (372), a vibrating ratchet (374) being arranged at a position close to the front end of the top of the transmission rod (373), and a return spring (375) being arranged at the bottom of the connecting rod (372); The connecting rod (372) is located inside the vibration hole (36), and the bottom of the return spring (375) is engaged with the bottom of the vibration hole (36).

4. An air quality detection device according to claim 3, characterized in that: The front end of the push rod (49) is movably sleeved with a torsion bar (401), one end of the torsion bar (401) is fixedly mounted with a travel plate (402), a third guide hole (403) is provided on the front side of the travel plate (402) near the top, matching protrusions (404) are fixedly mounted on both sides of the travel plate (402) near the top, a limit slide bar (405) is movably mounted inside the matching protrusion (404), the top of the limit slide bar (405) is fixedly connected to the top of the inner wall of the outer shell (1), a telescopic machine (406) is fixedly mounted on the back side of the side plate (45), and one end of the telescopic machine (406) is fixedly connected to the inner wall of the outer shell (1); An annular stepped hole is formed at the top of the rotating plate (44), and a first filter screen (407) is clamped inside the annular stepped hole; The contact ratchet (48) is located above the vibration ratchet (374), and the contact ratchet (48) will come into contact with the vibration ratchet (374) during the movement of the side arm (46).

5. An air quality detection device according to claim 4, characterized in that: The air intake device (5) comprises a first air intake pipe (51) and a second air intake pipe (52), the top of the first air intake pipe (51) being connected to the air supply port (8), a first bypass pipe (53) being arranged on the right side of the first air intake pipe (51), the first bypass pipe (53) being connected to the first air intake pipe (51), and a second bypass pipe (54) being arranged on the left side of the outer surface of the second air intake pipe (52), the second bypass pipe (54) being connected to the second air intake pipe (52); The axes of the first bypass pipe (53) and the second bypass pipe (54) are located on the same center line, the travel plate (402) is located between the first bypass pipe (53) and the second bypass pipe (54), and in an initial state, the third flow guide hole (403) is in a corresponding state to the first bypass pipe (53) and the second bypass pipe (54); The bottom of the first air intake pipe (51) is connected to and communicates with the first air guide hole (33) located above, and the bottom of the second air intake pipe (52) is connected to and communicates with the second air guide hole (34) located above.

6. An air quality detection device according to claim 2, characterized in that: The detection device (7) comprises a U-shaped tube (71), the left end opening of the U-shaped tube (71) is connected to and communicates with a first flow guide hole (33) located below, the right end opening of the U-shaped tube (71) is connected to and communicates with a second flow guide hole (34) located below, a second travel hole (72) is provided on the right side of the outer surface of the U-shaped tube (71), an inner sleeve (73) is movably installed on the right side of the inner cavity of the U-shaped tube (71), a mounting protrusion (74) is fixedly installed on the inner wall of the inner sleeve (73) near the bottom, a mounting hole (75) is provided on the top of the mounting protrusion (74), a second filter screen (76) is placed inside the mounting hole (75), and the outer surface of the inner sleeve (73) is connected to the mounting protrusion ( A limit slider (77) is fixedly installed at a position corresponding to the first stroke hole (74), the limit slider (77) extends from the inside of the second stroke hole (72), a detection slide bar (78) is movably installed inside the limit slider (77), a pressure detector (79) is fixedly installed on the outer surface of the detection slide bar (78) at a position below the limit slider (77), a detection spring (701) is clamped at a position outside the detection slide bar (78) at the bottom of the limit slider (77), the bottom of the detection spring (701) is connected to the pressure detector (79), a fixed base (702) is fixedly installed at the bottom of the detection slide bar (78), and the fixed base (702) is fixedly installed at the bottom of the inner wall of the housing (1).

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