Air detector

Abstract

The invention belongs to the technical field of air detection equipment, and particularly relates to an air detector which comprises a control panel with a screen, a PLC and a composite air detection probe, and the outer wall of the control panel with the screen and the outer wall of the PLC are jointly and fixedly connected with a protective shell. The air detector has a detection position self-cleaning function, impurity residues in an air sample are prevented from interfering with re-detection of the air detector, the maintenance period of the air detector can be prolonged, and the air detector further has a function of pre-detecting the humidity and the particulate matter content of the air sample, so that the detection accuracy is improved. The air detector has the air sample humidity correction capacity and the particle powder impurity separation capacity, the high-humidity environment is prevented from affecting the detection sensitivity of a sensing element in the detection end of the air detector, the situation that detection is blocked by particles in the air sample can be avoided, and the detection accuracy and reliability of the air detector are further improved.

Description

Technical Field

[0001] The invention belongs to the technical field of air detection equipment, and in particular relates to an air detector. Background Art

[0002] An air detector is a device used to detect air quality. It can monitor various components in the air, including harmful gases (such as formaldehyde, carbon monoxide, sulfur dioxide, etc.), particulate matter (PM2.5, PM10), and can also detect air humidity, temperature and other parameters. The data is collected through sensors and then converted into recognizable signals to intuitively display the air quality status on the display screen. For example, the authorization announcement number is CN220819949U, which discloses an air detector.

[0003] At present, during the use of air detectors, due to the small detection end and small contact area with the air, the air detector needs to use a fan to transport the external air sample to the detection end of the air detector in the form of airflow. However, the air detector is often disturbed by the external environment during use. For example, in the highly humid environment of "return of south wind", a large amount of moisture makes the particles in the air moist, and the viscosity of the surface increases, making it easier for them to stick to each other and adhere to the detection end of the air detector, gradually accumulating to form a particle layer that hinders detection. At the same time, excessive humidity will cause the sensing element of the air detector to swell, affecting the sensitivity of the detection, thereby affecting the accurate detection of gas concentration and other parameters by the detection end of the air detector, and affecting the reliability of the use of the air detector. In addition, in a dry environment, the static electricity generated by the friction between the dry airflow and the detection end of the air detector will absorb the surrounding particles and dust. These particles and dust will cover the detection end of the air detector, thereby hindering the normal contact between the air and the detection end, causing the air sample detected by the air detector to be distorted, which not only affects the accuracy of the air detection results of the air detector, but also affects the reliability of the use of the air detector.

[0004] To this end, we propose an air detector to solve the above problems. Summary of the invention

[0005] The object of the present invention is to provide an air detector in view of the above problems.

[0006] To achieve the above object, the present invention adopts the following technical scheme: an air detector, comprising a control panel with a screen, a PLC controller and a composite air detection probe, the outer walls of the control panel with a screen and the PLC controller are fixedly connected with a protective shell, the outer wall of the protective shell is provided with a mounting through hole matched with the control panel with a screen, and the lower surface of the protective shell is fixedly connected with a processing box; The outer wall of the processing box is fixedly connected with a mounting mechanism; The inner wall of the processing box is fixedly connected with a vertical partition, the outer wall of the vertical partition is fixedly connected with two partitions, the outer walls of the two partitions are fixedly connected to the inner wall of the processing box, and the vertical partition and the two partitions divide the internal cavity of the processing box into an installation cavity, a detection cavity, a processing cavity and an air intake cavity; The composite air detection probe is fixedly connected to the outer wall of the processing box located at the detection cavity, and the outer wall of the processing box located at the detection cavity is provided with a fixed through hole for installing the composite air detection probe; The outer wall of the processing box located at the processing chamber is fixedly connected to a particle impurity separation mechanism; The outer wall of the processing box located at the air inlet cavity is fixedly connected to an air inlet mechanism; The outer wall of the processing box located at the installation cavity is fixedly connected with a purification and anti-interference mechanism; The outer walls of the vertical partition located at the detection chamber and the processing chamber are respectively fixedly connected with the first electric push rod and the second electric push rod. The movable end of the first electric push rod is fixedly connected with the first sealing piston block which is sealingly and movably connected to the inner wall of the detection chamber. The movable end of the second electric push rod is fixedly connected with the second sealing piston block which is sealingly and movably connected to the inner wall of the processing chamber.

[0007] In the above-mentioned air detector, the mounting mechanism includes a connecting tube fixedly connected to the outer wall of the processing box, the inner wall of the connecting tube is fixedly connected to a damping rotation bearing, the inner wall of the inner ring of the damping rotation bearing is fixedly connected to a fixing rod, the bottom end of the fixing rod is fixedly connected to a fixing plate, and a plurality of mounting through holes are opened on the surface of the fixing plate.

[0008] In the above-mentioned air detector, the particulate impurity separation mechanism includes a connecting cover fixedly connected to the outer wall of the processing box, the inner wall of the connecting cover is fixedly connected to a ceramic air-permeable filter block, the air inlet side of the ceramic air-permeable filter block is fixedly connected to a sponge block, the top outer wall of the connecting cover is fixedly connected to a conduit, the top of the conduit is fixedly connected to an electromagnetic control valve, and the side end of the electromagnetic control valve is fixedly connected to the outer wall of the processing box located in the detection chamber.

[0009] In the above-mentioned air detector, the air intake mechanism includes an air intake bend pipe fixedly connected to the outer wall of the processing box, the air outlet end of the air intake bend pipe is fixedly connected to a hollow cylinder, the bottom end of the hollow cylinder is fixedly connected to the inner wall of the processing box, the outer wall of the processing box located on the inner side of the hollow cylinder is fixedly embedded with a drainage solenoid valve, the pipe wall of the air intake bend pipe is obliquely fixedly embedded with a humidity sensor and a particulate matter sensor, the outer wall of the partition plate located at the hollow cylinder is provided with a mounting hole, and the hole wall of the mounting hole is fixedly connected with an insulating hollow block, the bottom end of the insulating hollow block is provided with two air guide holes, the top of the insulating hollow block is fixedly connected with an air intake solenoid valve, the side wall of the insulating hollow block is fixedly embedded with a metal plate, the outer wall of one side of the metal plate is fixedly connected with a bimetallic mesh cylinder, the outer wall of the other side of the metal plate is fixedly connected with a semiconductor refrigeration plate, the heat dissipation side of the semiconductor refrigeration plate passes through the outer wall of the hollow cylinder and is fixedly connected with a heat sink.

[0010] In the above-mentioned air detector, the purification and anti-interference mechanism includes a threaded barrel fixedly embedded in the bottom end of the processing box, the inner wall of the threaded barrel is threadedly connected with a threaded ring, the inner wall of the threaded ring is fixedly connected with a filter screen, the bottom end of the filter screen is fixedly connected with a filter cloth layer, the inner wall of the threaded barrel is fixedly connected with a ceramic air-permeable filter plate, the bottom end of the ceramic air-permeable filter plate and the top end of the filter screen are jointly filled with an activated carbon filter block, the top end of the threaded barrel is fixedly connected with a micro-air pump, the air inlet end and the air outlet end of the micro-air pump are respectively fixedly connected with an air inlet three-way reversing solenoid valve and an air outlet three-way reversing solenoid valve, one air inlet end of the air inlet three-way reversing solenoid valve is fixedly connected with the top end of the threaded barrel, the other air inlet end of the air inlet three-way reversing solenoid valve is fixedly connected with an air extraction pipe, and the second sealing piston block The outer wall is fixedly connected with a first one-way valve, and the outer wall of the second sealing piston block is provided with a mounting hole that matches the first one-way valve, the air inlet end of the exhaust pipe passes through the vertical partition and is fixedly connected with the connecting end of the first one-way valve, the outer wall of the second sealing piston block is provided with a connecting through hole, and the hole wall of the connecting through hole is fixedly connected with an air pressure sensor, one outlet end of the air outlet three-way reversing solenoid valve is fixedly connected with an air outlet pipe, the outlet end of the air outlet pipe passes through the vertical partition and is fixedly connected with the second one-way valve, the second one-way valve is fixedly connected with the first sealing piston block, the outer wall of the first sealing piston block is provided with a fixing hole that matches the second one-way valve, the other outlet end of the air outlet three-way reversing solenoid valve is fixedly connected with an exhaust pipe, and the outlet end of the exhaust pipe passes through the inner wall of the top end of the threaded cylinder and the lower surface of the ceramic breathable filter plate.

[0011] In the above-mentioned air detector, the pipe wall of the outlet pipe is fixedly connected with a branch pipe, the outlet end of the branch pipe passes through the vertical partition and is fixedly connected with a third one-way valve, and the outlet end of the third one-way valve is fixedly connected with the bottom end of the insulating hollow block.

[0012] In the above-mentioned air detector, a diverter arc block is fixedly connected to the inner wall of the intake elbow, and the humidity sensor and the particle sensor are respectively located at the inclined top and the inclined bottom of the diverter arc block.

[0013] In the above-mentioned air detector, the outer wall of the vertical partition is provided with a plurality of pipe holes, and the outer wall of the processing box located in the air inlet cavity is provided with heat dissipation holes for heat dissipation of the semiconductor refrigeration plate.

[0014] Compared with the existing technology, the advantages of an air detector are: 1. By setting up the purification and anti-interference mechanism, the first electric push rod and the second electric push rod, when it is necessary to detect the air through the air detector, the detection chamber and the processing chamber of the air detector are first cleaned and processed by the purification and anti-interference mechanism, and the first electric push rod, the second electric push rod, the first sealing piston block and the second sealing piston block are cooperated to clean the residual substances of the air sample attached to the inner wall of the detection chamber and the processing chamber. This mechanism enables the air detector to have the function of self-cleaning of the detection position, avoids the impurities in the air sample from interfering with the re-detection of the air detector, effectively improves the accuracy of the detection result of the air detector, and can also extend the maintenance cycle of the air detector, while improving the reliability of the use of the air detector.

[0015] 2. Through the particle impurity separation mechanism and air intake mechanism, when the processing chamber and the detection chamber of the air detector are cleaned by the purification and anti-interference mechanism and are in a low-pressure environment, the PLC controller controls the air intake solenoid valve of the air intake mechanism to open. Since the processing chamber is in a low-pressure environment, the processing chamber draws in external air samples through the air intake solenoid valve, the hollow cylinder and the air intake elbow. When the air sample enters through the air intake elbow, the particle sensor and the humidity sensor immediately detect the particle content and humidity in the air sample, and control the semiconductor refrigeration chip to start according to the humidity value feedback. After the semiconductor refrigeration chip is started, it can correct the humidity of the high-humidity air sample, so that the humidity of the air sample entering the detection chamber meets the sensing element in the composite air detection probe. Within the normal working humidity range, excessive humidity is prevented from changing the physical and chemical properties of the sensing elements in the air detector. Moreover, when the air sample passes through the particle impurity separation mechanism, the particles are intercepted to prevent the particle impurities from accumulating in the composite air detection probe to form an obstruction layer, so that the composite air detection probe can fully and reliably detect the various gas components and contents of the air sample. This mechanism enables the air detector to not only have the function of pre-detecting the humidity and particle content of the air sample, but also has the function of air sample humidity correction and particle powder impurity separation. It not only prevents the high humidity environment from affecting the detection sensitivity of the sensing element in the detection end of the air detector, but also prevents the particle matter in the air sample from blocking the detection, and improves the accuracy and reliability of the air detector detection.

[0016] 3. Through the particle impurity separation mechanism, when in a dry environment in winter, due to the low humidity in the air, the semiconductor refrigeration plate in the air intake mechanism does not need to be started, and the dust in the air will not be blocked in the bimetallic mesh tube due to excessive humidity. In addition, since the particle impurity separation mechanism separates the particulate matter in the air sample, a large amount of dust particles will not accumulate on the surface of the composite air detection probe in the detection cavity, avoiding interference with the air sample detection results. Moreover, the humidity sensor and particulate matter sensor in the air intake elbow can also be cleaned by the airflow generated by the purification anti-interference mechanism after each detection, thereby ensuring the accuracy of the air detector detection results and the reliability of the air detector. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a structural schematic diagram of an air detector provided by the present invention; Figure 2 It is a structural schematic diagram of a partial cross-section of an air detector provided by the present invention; Figure 3 It is a structural schematic diagram of a particle impurity separation mechanism in an air detector provided by the present invention; Figure 4 It is a structural schematic diagram of an air intake mechanism in an air detector provided by the present invention; Figure 5 yes Figure 4 Schematic diagram of the structure of the bimetallic mesh cylinder; Figure 6 It is a structural schematic diagram of a purification and anti-interference mechanism in an air detector provided by the present invention; Figure 7 yes Figure 2 Schematic diagram of the partially enlarged structure.

[0018] In the figure: 1 control panel with screen, 2 PLC controller, 3 composite air detection probe, 4 installation mechanism, 41 connecting tube, 42 damping rotary bearing, 43 fixing rod, 44 fixing plate, 5 particle impurity separation mechanism, 51 connecting cover, 52 ceramic breathable filter block, 53 sponge block, 54 catheter, 55 electromagnetic control valve, 6 air intake mechanism, 61 air intake elbow, 62 hollow tube, 63 drainage electromagnetic valve, 64 humidity sensor, 65 particle sensor, 66 heat insulation hollow block, 67 air guide hole, 68 air intake electromagnetic valve, 69 metal plate, 610 bimetallic mesh tube, 611 semiconductor refrigeration plate, 612 heat sink, 7 purification and anti-interference mechanism, 71 threaded tube, 72 threaded ring, 73 Filter screen plate, 74 filter cloth layer, 75 ceramic breathable filter plate, 76 activated carbon filter block, 77 micro vacuum pump, 78 air inlet three-way reversing solenoid valve, 79 air outlet three-way reversing solenoid valve, 710 air extraction pipe, 711 first one-way valve, 712 air pressure sensor, 713 air outlet pipe, 714 second one-way valve, 715 exhaust pipe, 8 first electric push rod, 9 second electric push rod, 10 protective shell, 11 processing box, 12 vertical partition, 13 partition plate, 14 installation cavity, 15 detection cavity, 16 processing cavity, 17 air inlet cavity, 18 first sealing piston block, 19 second sealing piston block, 20 branch pipe, 21 third one-way valve, 22 diversion arc block, 23 through-hole, 24 heat dissipation through hole. Implementation

[0019] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0020] like Figure 1-Figure 7 As shown, an air detector includes an operation panel with a screen 1, a PLC controller 2 and a composite air detection probe 3. The outer walls of the operation panel with a screen 1 and the PLC controller 2 are fixedly connected to a protective shell 10. The outer wall of the protective shell 10 is provided with a mounting hole matched with the operation panel with a screen 1. The lower surface of the protective shell 10 is fixedly connected to a processing box 11. The outer wall of the processing box 11 is fixedly connected to a mounting mechanism 4. The mounting mechanism 4 includes a connecting cylinder 41 fixedly connected to the outer wall of the processing box 11. The inner wall of the connecting cylinder 41 is fixedly connected to a damping rotation bearing 42. The inner wall of the inner ring of the damping rotation bearing 42 is fixedly connected to a fixing rod 43. The bottom end of the fixing rod 43 is fixedly connected to a fixing plate 44. The outer surface of the fixing plate 44 is provided with a plurality of mounting holes. Through this mechanism, the installation and use of the air detector can be facilitated.

[0021] The inner wall of the processing box 11 is fixedly connected with a vertical partition 12, the outer wall of the vertical partition 12 is fixedly connected with two partitions 13, the outer walls of the two partitions 13 are fixedly connected to the inner wall of the processing box 11, and the vertical partition 12 and the two partitions 13 divide the internal cavity of the processing box 11 into an installation cavity 14, a detection cavity 15, a processing cavity 16 and an air intake cavity 17; The composite air detection probe 3 is fixedly connected to the outer wall of the processing box 11 located at the detection cavity 15, and the outer wall of the processing box 11 located at the detection cavity 15 is provided with a fixed through hole for installing the composite air detection probe 3; The outer wall of the processing box 11 located at the processing chamber 16 is fixedly connected to a particle impurity separation mechanism 5, and the particle impurity separation mechanism 5 includes a connecting cover 51 fixedly connected to the outer wall of the processing box 11, the inner wall of the connecting cover 51 is fixedly connected to a ceramic air-permeable filter block 52, the air inlet side of the ceramic air-permeable filter block 52 is fixedly connected to a sponge block 53, the top outer wall of the connecting cover 51 is fixedly connected to a conduit 54, the top of the conduit 54 is fixedly connected to an electromagnetic control valve 55, and the side end of the electromagnetic control valve 55 is fixedly connected to the outer wall of the processing box 11 located at the detection chamber 15.

[0022] The outer wall of the processing box 11 located at the air inlet cavity 17 is fixedly connected with an air inlet mechanism 6, and the air inlet mechanism 6 includes an air inlet elbow 61 fixedly connected with the outer wall of the processing box 11, and the air outlet end of the air inlet elbow 61 is fixedly connected with a hollow cylinder 62, and the bottom end of the hollow cylinder 62 is fixedly connected to the inner wall of the processing box 11, and the outer wall of the processing box 11 located inside the hollow cylinder 62 is fixedly embedded with a drainage solenoid valve 63, and the pipe wall of the air inlet elbow 61 is tilted and fixedly embedded with a humidity sensor 64 and a particle sensor 65, and the outer wall of the partition plate 13 located at the hollow cylinder 62 is provided with a mounting hole, and the hole wall of the mounting hole is fixedly connected with a heat insulating hollow block 66, and the bottom end of the heat insulating hollow block 66 is provided with two air guide holes 67 The top of the heat-insulating hollow block 66 is fixedly connected to an air intake solenoid valve 68, and a metal plate 69 is fixedly embedded in the side wall of the heat-insulating hollow block 66. A bimetallic mesh tube 610 is fixedly connected to the outer wall of one side of the metal plate 69, and a semiconductor refrigeration plate 611 is fixedly connected to the outer wall of the other side of the metal plate 69. The heat dissipation side of the semiconductor refrigeration plate 611 passes through the outer wall of the hollow tube 62 and is fixedly connected to a heat sink 612. A plurality of through-tube holes 23 are provided on the outer wall of the vertical partition 12, and a heat dissipation through hole 24 for heat dissipation of the semiconductor refrigeration plate 611 is provided on the outer wall of the processing box 11 located at the air intake cavity 17. The heat dissipation through hole 24 can facilitate the heat dissipation of the heat sink 612 on the heat dissipation side of the semiconductor refrigeration plate 611.

[0023] The outer wall of the treatment box 11 located at the installation cavity 14 is fixedly connected to the purification and anti-interference mechanism 7, and the purification and anti-interference mechanism 7 includes a threaded barrel 71 fixedly embedded with the bottom end of the treatment box 11, and the inner wall of the threaded barrel 71 is threadedly connected with a threaded ring 72, and the inner wall of the threaded ring 72 is fixedly connected with a filter screen plate 73, and the bottom end of the filter screen plate 73 is fixedly connected with a filter cloth layer 74, and the inner wall of the threaded barrel 71 is fixedly connected with a ceramic breathable filter plate 75, and the bottom end of the ceramic breathable filter plate 75 and the top end of the filter screen plate 73 are jointly filled with an activated carbon filter block 76, and the threaded barrel The top of the threaded cylinder 71 is fixedly connected with a micro air pump 77, and the air inlet end and the air outlet end of the micro air pump 77 are respectively fixedly connected with an air inlet three-way reversing solenoid valve 78 and an air outlet three-way reversing solenoid valve 79, one air inlet end of the air inlet three-way reversing solenoid valve 78 is fixedly connected with the top of the threaded cylinder 71, and the other air inlet end of the air inlet three-way reversing solenoid valve 78 is fixedly connected with an air extraction pipe 710, and the outer wall of the second sealing piston block 19 is fixedly connected with a first one-way valve 711, and the outer wall of the second sealing piston block 19 is provided with an installation fitting that matches the first one-way valve 711. The air inlet end of the air extraction pipe 710 passes through the vertical partition 12 and is fixedly connected to the connecting end of the first one-way valve 711. The outer wall of the second sealing piston block 19 is provided with a connecting through hole, and the hole wall of the connecting through hole is fixedly connected to the air pressure sensor 712. One outlet end of the air outlet three-way reversing solenoid valve 79 is fixedly connected to an outlet pipe 713. The outlet end of the outlet pipe 713 passes through the vertical partition 12 and is fixedly connected to the second one-way valve 714. The second one-way valve 714 is fixedly connected to the first sealing piston block 18. The outer wall of the first sealing piston block 18 is provided with a connecting through hole. There is a fixed hole that matches the second one-way valve 714. The other outlet end of the outlet three-way reversing solenoid valve 79 is fixedly connected to an exhaust pipe 715. The outlet end of the exhaust pipe 715 passes through the inner wall of the top end of the threaded cylinder 71 and the lower surface of the ceramic breathable filter plate 75. This mechanism enables the air detector to have the function of self-cleaning at the detection position, avoiding impurities remaining in the air sample to interfere with the re-detection of the air detector, effectively improving the accuracy of the detection results of the air detector, and can also extend the maintenance cycle of the air detector. At the same time, it can improve the reliability of the use of the air detector.

[0024] The pipe wall of the air outlet pipe 713 is fixedly connected with a branch pipe 20, and the air outlet end of the branch pipe 20 passes through the vertical partition 12 and is fixedly connected with a third one-way valve 21. The air outlet end of the third one-way valve 21 is fixedly connected with the bottom end of the insulating hollow block 66. The airflow ejected by the third one-way valve 21 can clean the bimetallic mesh tube 610 at the bottom to ensure the cleaning effect of the bimetallic mesh tube 610. The inner wall of the air intake elbow 61 is fixedly connected with a diverter arc block 22. The humidity sensor 64 and the particulate matter sensor 65 are respectively located at the inclined top and the inclined bottom of the diverter arc block 22. The diverter arc block 22 can generate two oblique airflows, and the two oblique airflows are respectively blown to the detection ends of the humidity sensor 64 and the particulate matter sensor 65, so as to realize dust cleaning at the detection ends of the humidity sensor 64 and the particulate matter sensor 65 and avoid dust accumulation interfering with the detection results.

[0025] The outer walls of the vertical partition 12 located at the detection chamber 15 and the processing chamber 16 are respectively fixedly connected with the first electric push rod 8 and the second electric push rod 9. The movable end of the first electric push rod 8 is fixedly connected with the first sealing piston block 18 which is sealingly and movably connected to the inner wall of the detection chamber 15. The movable end of the second electric push rod 9 is fixedly connected with the second sealing piston block 19 which is sealingly and movably connected to the inner wall of the processing chamber 16.

[0026] The control panel with screen 1, the drain solenoid valve 63, the air intake solenoid valve 68, the semiconductor refrigeration plate 611, the micro vacuum pump 77, the air intake three-way reversing solenoid valve 78, the air outlet three-way reversing solenoid valve 79, the first electric push rod 8 and the second electric push rod 9 are all electrically connected to the output end of the PLC controller 2 through wires, and the composite air detection probe 3, the humidity sensor 64, the particulate matter sensor 65 and the air pressure sensor 712 are all electrically connected to the input end of the PLC controller 2 through wires. The model of the composite air detection probe 3 is RS-MS111-1 composite air detection head. The composite air detection probe 3 can detect a variety of gases, including oxygen, hydrogen, carbon dioxide, ozone, ammonia, PM2.5 / PM10, carbon monoxide, hydrogen sulfide, methane, etc., and can add humidity, atmospheric pressure, illumination, TVOC and other detection functions as needed, and realize data transmission through interfaces and network ports. The above-mentioned power-on equipment and electrical connections are existing technologies and will not be repeated here.

[0027] The operating principle of the present invention is now described as follows: when it is necessary to detect the air through the air detector, first, the micro air pump 77, the air intake solenoid valve 68 and the electromagnetic control valve 55 are powered on and started through the control panel with screen 1. The air intake solenoid valve 68 and the electromagnetic control valve 55 are opened after being powered on, and the micro air pump 77 sucks the outside air through the unpowered air intake three-way reversing solenoid valve 78 and the threaded cylinder 71. During the process of the outside air passing through the threaded cylinder 71, it is filtered and purified by the filter cloth layer 74, the filter mesh plate 73, the activated carbon filter block 76 and the ceramic breathable filter plate 75. Then the purified air is transported to the detection chamber 15 through the unpowered air outlet three-way reversing solenoid valve 79, the first one-way valve 711 and the second one-way valve 714. At the same time, part of the air in the first one-way valve 711 is also blown to the bimetallic mesh cylinder 610 through the branch pipe 20 and the third one-way valve 21 for cleaning. The clean airflow entering the detection chamber 15 can not only discharge the air detection sample remaining in the detection chamber 15, but also the flowing clean airflow can purge and clean the inner wall of the detection chamber 15 and the outer wall of the first sealing piston block 18 to avoid the interference of the residual air sample on the next batch of air samples. In addition, the clean air in the detection chamber 15 also enters the processing chamber 16 through the particle impurity separation mechanism 5. When the airflow passes through the particle impurity separation mechanism 5, it can also backwash the ceramic air-permeable filter block 52 and the sponge block 53 to avoid excessive impurities blocking the impurity separation channel of the particle impurity separation mechanism 5. Then the clean airflow also cleans the inner wall of the processing chamber 16 and the second sealing piston block 19. The cleaned air is discharged through the air inlet solenoid valve 68 to clean the bimetallic mesh cylinder 610, so that the bimetallic mesh cylinder 610 has two upper and lower airflows for cleaning, thereby ensuring the cleaning effect of the bimetallic mesh cylinder 610. At the same time, the cleaned airflow is discharged through the air intake duct 54, and part of the airflow discharged from the air intake duct 54 is divided into two oblique airflows at the diversion arc block 22. The two oblique airflows respectively perform high-speed airflow flushing and cleaning on the detection ends of the humidity sensor 64 and the particle sensor 65, and finally the airflow is discharged through the air intake duct 54. After maintaining this clean airflow flushing and cleaning for 1 minute, the PLC controller 2 controls the moving ends of the first electric push rod 8 and the second electric push rod 9 to extend for 10 seconds. The 10 seconds can ensure that the moving ends of the first electric push rod 8 and the second electric push rod 9 The moving end is fully extended, and the moving ends of the first electric push rod 8 and the second electric push rod 9 are extended to push the first sealing piston block 18 to move in the detection chamber 15, and the first sealing piston block 18 is used to scrape the residual interfering substances attached to the inner wall of the detection chamber 15. Similarly, the second sealing piston block 19 can clean the residual substances attached to the inner wall of the processing chamber 16. After the 10-second countdown is completed, the PLC controller 2 controls the moving end of the second electric push rod 9 to retract, and the electromagnetic control valve 55 and the air inlet electromagnetic valve 68 are powered off and closed, so that the processing chamber 16 is in a sealed environment. Then the PLC controller The device 2 then controls the inlet three-way reversing solenoid valve 78 and the outlet three-way reversing solenoid valve 79 to be energized. The inlet three-way reversing solenoid valve 78 and the outlet three-way reversing solenoid valve 79 are energized to change the air guide direction, so that the micro air pump 77 sucks the air of the processing chamber 16 through the air suction pipe 710 and the first one-way valve 711, so that the processing chamber 16 is in a low-pressure environment. The extracted air can also backwash and clean the filter screen plate 73 and the filter cloth layer 74 at the bottom of the threaded cylinder 71 to avoid blockage. In addition, during the suction process, the air pressure sensor 712 detects the pressure of the processing chamber in real time. 16, if the air pressure value of the processing chamber 16 detected by the air pressure sensor 712 reaches the low pressure threshold preset by the PLC controller 2, the PLC controller 2 controls the micro air pump 77 to power off and pause, and also opens the air intake mechanism 6 to perform air detection sample sampling. This mechanism enables the air detector to have a self-cleaning function at the detection position, avoiding impurities in the air sample from interfering with the re-detection of the air detector, effectively improving the accuracy of the air detector detection result, and can also extend the maintenance cycle of the air detector, while improving the reliability of the use of the air detector; When the air intake mechanism 6 takes air samples, the air intake solenoid valve 68 is controlled to open by the PLC controller 2. Since the processing chamber 16 is in a low-pressure environment, the processing chamber 16 draws in external air samples through the air intake solenoid valve 68, the hollow cylinder 62 and the air intake elbow 61. When the air sample enters through the air intake elbow 61, the particle sensor 65 and the humidity sensor 64 immediately detect the particle content and humidity in the air sample. Then the particle sensor 65 and the humidity sensor 64 send the detected values ​​to the PLC controller 2 in the form of electrical signals. The PLC controller 2 displays the humidity and particle values ​​on the display screen of the control panel 1 with a screen. Moreover, when the humidity value detected by the humidity sensor 64 exceeds the humidity warning threshold preset by the PLC controller 2, the PLC controller 2 controls the semiconductor refrigeration plate 611 to start. After the semiconductor refrigeration plate 611 is started, the surface temperature of the bimetallic mesh tube 610 can be reduced through the bimetallic plate 69. The low-temperature bimetallic mesh tube 610 can cool the air sample passing through the insulating hollow block 66. At the same time, the low-temperature environment can also liquefy the moisture in the air into water droplets, and finally the water droplets fall into the bottom of the hollow tube 62 and accumulate, completing the humidity correction processing of the air sample, so that the humidity in the air sample meets the humidity range for the normal operation of the internal sensing element of the composite air detection probe 3. To prevent excessive humidity from changing the physical and chemical properties of the sensing elements in the air detector, the reliability of the air detector detection work is ensured. When the air pressure in the processing chamber 16 detected by the air pressure sensor 712 is consistent with the external air pressure preset by the PLC controller 2, the air pressure sensor 712 sends a signal to the PLC controller 2 again. At this time, the PLC controller 2 controls the air intake solenoid valve 68 and the semiconductor refrigeration plate 611 to be powered off. At the same time, the PLC controller 2 also controls the first electric push rod 8 and the electromagnetic control valve 55 to be powered on. The semiconductor refrigeration plate 611 is powered off and suspended, which can reduce the power consumption of the detector when it is used. The first electric push rod 8 drives the first sealing piston block 18 to move The detection chamber 15 is in a negative pressure environment, and the air sample in the processing chamber 16 enters the processing chamber 16 through the particle impurity separation mechanism 5 under the action of negative pressure suction, and in the process of passing through the particle impurity separation mechanism 5, the particle impurities in the air are intercepted and separated by the ceramic air permeable filter block 52 and the sponge block 53, so as to prevent the particle impurities from entering the detection chamber 15, and at the same time prevent the particle impurities from accumulating at the detection end of the composite air detection probe 3 to form an obstruction layer, and then the composite air detection probe 3 can fully and reliably detect the various gas components and contents of the air sample, and the detection results are fed back to the PLC controller 2, and finally displayed on the display screen of the screen control panel 1; When in a dry environment in winter, due to the low humidity in the air, the PLC controller 2 does not control the semiconductor refrigeration plate 611 in the air intake mechanism 6 to start, and the dust in the air will not be blocked in the bimetallic mesh tube 610 due to excessive humidity. In addition, since the particle impurity separation mechanism 5 separates the particulate matter in the air sample, a large amount of dust particles will not accumulate on the surface of the composite air detection probe 3 in the detection chamber 15, thereby avoiding interference with the air sample detection results. Moreover, the humidity sensor 64 and the particle sensor 65 in the air intake bend 61 can also be cleaned by the airflow generated by the purification anti-interference mechanism 7 after each detection, thereby ensuring the accuracy of the air detector detection results and the reliability of the air detector. This mechanism enables the air detector to not only have the function of pre-detecting the humidity and particulate matter content of the air sample, but also has the function of correcting the humidity of the air sample and separating the particulate powder impurities. It not only avoids the high humidity environment from affecting the detection sensitivity of the sensing element in the detection end of the air detector, but also avoids the situation where the particles in the air sample block the detection, and can improve the accuracy and reliability of the air detector detection.

[0028] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. An air detector, comprising a control panel with a screen (1), a PLC controller (2) and a composite air detection probe (3), characterized in that: The outer walls of the control panel with screen (1) and the PLC controller (2) are fixedly connected to a protective housing (10), the outer wall of the protective housing (10) is provided with a mounting through hole matched with the control panel with screen (1), and the lower surface of the protective housing (10) is fixedly connected to a processing box (11); the outer wall of the processing box (11) is fixedly connected to a mounting mechanism (4); the inner wall of the processing box (11) is fixedly connected to a vertical partition (12), the outer wall of the vertical partition (12) is fixedly connected to two partition plates (13), the outer walls of the two partition plates (13) are fixedly connected to the inner wall of the processing box (11), and the vertical partition (12) and the two partition plates (13) divide the internal cavity of the processing box (11) into an installation cavity (14), a detection cavity (15), a processing cavity (16) and an air intake cavity (17); the composite air detection probe (3) is fixedly connected to the outer wall of the processing box (11) at the detection cavity (15). The outer wall of the processing box (11) located at the detection chamber (15) is provided with a fixed through hole for installing the composite air detection probe (3); the outer wall of the processing box (11) located at the processing chamber (16) is fixedly connected to a particle impurity separation mechanism (5); the outer wall of the processing box (11) located at the air intake chamber (17) is fixedly connected to an air intake mechanism (6); the outer wall of the processing box (11) located at the installation chamber (14) is fixedly connected to a purification and anti-interference mechanism (7); the outer walls of the vertical partition (12) located at the detection chamber (15) and the processing chamber (16) are respectively fixedly connected to a first electric push rod (8) and a second electric push rod (9), the movable end of the first electric push rod (8) is fixedly connected to a first sealing piston block (18) which is sealingly and movably connected to the inner wall of the detection chamber (15), and the movable end of the second electric push rod (9) is fixedly connected to a second sealing piston block (19) which is sealingly and movably connected to the inner wall of the processing chamber (16).

2. An air detector according to claim 1, characterized in that: The mounting mechanism (4) comprises a connecting tube (41) fixedly connected to the outer wall of the processing box (11); the inner wall of the connecting tube (41) is fixedly connected to a damping rotary bearing (42); the inner wall of the inner ring of the damping rotary bearing (42) is fixedly connected to a fixing rod (43); the bottom end of the fixing rod (43) is fixedly connected to a fixing plate (44); and the outer surface of the fixing plate (44) is provided with a plurality of mounting through holes.

3. An air detector according to claim 1, characterized in that: The particle impurity separation mechanism (5) comprises a connection cover (51) fixedly connected to the outer wall of the processing box (11); the inner wall of the connection cover (51) is fixedly connected to a ceramic air-permeable filter block (52); the air inlet side of the ceramic air-permeable filter block (52) is fixedly connected to a sponge block (53); the top outer wall of the connection cover (51) is fixedly connected to a conduit (54); the top of the conduit (54) is fixedly connected to an electromagnetic control valve (55); the side end of the electromagnetic control valve (55) is fixedly connected to the outer wall of the processing box (11) located in the detection chamber (15).

4. An air detector according to claim 1, characterized in that: The air intake mechanism (6) comprises an air intake bend (61) fixedly connected to the outer wall of the processing box (11); the air outlet end of the air intake bend (61) is fixedly connected to a hollow cylinder (62); the bottom end of the hollow cylinder (62) is fixedly connected to the inner wall of the processing box (11); a drainage solenoid valve (63) is fixedly embedded in the outer wall of the processing box (11) located inside the hollow cylinder (62); a humidity sensor (64) and a particle sensor (65) are fixedly embedded in the wall of the air intake bend (61) at an angle; a mounting hole is opened on the outer wall of the partition plate (13) located at the hollow cylinder (62); and the hole wall of the mounting hole is A heat-insulating hollow block (66) is fixedly connected, and two air guide holes (67) are provided at the bottom end of the heat-insulating hollow block (66). An air intake solenoid valve (68) is fixedly connected to the top end of the heat-insulating hollow block (66). A metal plate (69) is fixedly embedded in the side wall of the heat-insulating hollow block (66). A bimetallic mesh tube (610) is fixedly connected to the outer wall of one side of the metal plate (69), and a semiconductor cooling plate (611) is fixedly connected to the outer wall of the other side of the metal plate (69). The heat dissipation side of the semiconductor cooling plate (611) passes through the outer wall of the hollow tube (62) and is fixedly connected to a heat sink (612).

5. An air detector according to claim 4, characterized in that: The purification and anti-interference mechanism (7) comprises a threaded barrel (71) fixedly embedded in the bottom end of the treatment box (11); the inner wall of the threaded barrel (71) is threadedly connected to a threaded ring (72); the inner wall of the threaded ring (72) is fixedly connected to a filter screen plate (73); the bottom end of the filter screen plate (73) is fixedly connected to a filter cloth layer (74); the inner wall of the threaded barrel (71) is fixedly connected to a ceramic air-permeable filter plate (75); the bottom end of the ceramic air-permeable filter plate (75) and the top end of the filter screen plate (73) are jointly filled with activated carbon filter. The top end of the threaded cylinder (71) is fixedly connected to a micro air pump (77), the air inlet end and the air outlet end of the micro air pump (77) are respectively fixedly connected to an air inlet three-way reversing solenoid valve (78) and an air outlet three-way reversing solenoid valve (79), one air inlet end of the air inlet three-way reversing solenoid valve (78) is fixedly connected to the top end of the threaded cylinder (71), the other air inlet end of the air inlet three-way reversing solenoid valve (78) is fixedly connected to an air extraction pipe (710), and the outer wall of the second sealing piston block (19) is fixedly connected to a first a one-way valve (711), the outer wall of the second sealing piston block (19) is provided with a mounting hole that matches the first one-way valve (711), the air inlet end of the air extraction pipe (710) passes through the vertical partition plate (12) and is fixedly connected to the connecting end of the first one-way valve (711), the outer wall of the second sealing piston block (19) is provided with a connecting through hole, and the hole wall of the connecting through hole is fixedly connected to an air pressure sensor (712), and one of the outlet ends of the outlet three-way reversing solenoid valve (79) is fixedly connected to an outlet pipe (713), and the outlet pipe ( The outlet end of the three-way reversing solenoid valve (713) passes through the vertical partition (12) and is fixedly connected to a second one-way valve (714); the second one-way valve (714) is fixedly connected to a first sealing piston block (18); the outer wall of the first sealing piston block (18) is provided with a fixing hole that matches the second one-way valve (714); the other outlet end of the outlet three-way reversing solenoid valve (79) is fixedly connected to an exhaust pipe (715); the outlet end of the exhaust pipe (715) passes through the inner wall of the top end of the threaded barrel (71) and the lower surface of the ceramic air-permeable filter plate (75).

6. An air detector according to claim 5, characterized in that: The pipe wall of the air outlet pipe (713) is fixedly connected to a branch pipe (20); the air outlet end of the branch pipe (20) passes through the vertical partition plate (12) and is fixedly connected to a third one-way valve (21); the air outlet end of the third one-way valve (21) is fixedly connected to the bottom end of the heat-insulating hollow block (66).

7. An air detector according to claim 4, characterized in that: The inner wall of the intake curved pipe (61) is fixedly connected to a diverter arc block (22), and the humidity sensor (64) and the particle sensor (65) are respectively located at the inclined top and the inclined bottom of the diverter arc block (22).

8. An air detector according to claim 6, characterized in that: The outer wall of the vertical partition (12) is provided with a plurality of pipe penetration holes (23), and the outer wall of the processing box (11) located in the air inlet cavity (17) is provided with a heat dissipation through hole (24) for dissipating heat from the semiconductor cooling plate (611).

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