Cooking fume particulate matter detector and online zero calibration method thereof

Abstract

The lampblack particulate matter detector comprises a shell, one side of the shell is rotationally connected with a box door, and a monitoring device is arranged in the shell; the monitoring device comprises a sucking pump, a filter, a first particulate matter sensor, a water-gas separator, a detection pipe for communicating the sucking pump, the filter, the first particulate matter sensor and the water-gas separator, and a display screen arranged on the box door; the air extracting pump, the filter, the first particulate matter sensor and the water-gas separator are all arranged in the shell and fixedly connected with the shell, the first particulate matter sensor is electrically connected with the display screen, an air inlet pipe is arranged on one side of the water-gas separator, and the air inlet pipe is communicated with the interior of the water-gas separator. And the content of oil smoke particles can be monitored in real time.

Description

Technical Field

[0001] The present invention relates to the technical field of detectors, and particularly to an oil fume particulate matter detector and an online zero calibration method thereof. Background Art

[0002] In modern society, with the continuous enhancement of environmental protection awareness and the increasing demand for air quality, the detection of oil fume particulate matter has become increasingly important. Oil fume particulate matter not only harms human health, such as causing respiratory diseases, etc., but also has a negative impact on the atmospheric environmental quality. Therefore, accurately and reliably detecting the concentration and characteristics of oil fume particulate matter is of crucial significance for environmental protection and human health protection.

[0003] However, traditional oil fume detection methods usually adopt off-line sampling and laboratory analysis. Although these methods can obtain accurate oil fume concentration data to a certain extent, they also have some obvious defects. First of all, off-line sampling requires collecting the oil fume samples in the air into a container and sending them to the laboratory for analysis. This process is not only time-consuming but also requires a long operation preparation time, resulting in the inability to quickly obtain the detection results. Secondly, off-line sampling usually requires professional personnel for sampling, processing, and transportation, with cumbersome operations and being easily interfered by external factors. In addition, traditional detection methods often cannot monitor the change of oil fume particulate matter concentration in real time, which leads to the failure to take necessary protective measures or conduct effective emission control in time when the oil fume concentration is too high, thus having a negative impact on human health and the environment. Summary of the Invention

[0004] The main object of the present invention is to provide an oil fume particulate matter detector and an online zero calibration method thereof, aiming to monitor the content of oil fume particulate matter in real time.

[0005] To achieve the above object, the present invention provides an oil fume particulate matter detector, including a housing, one side of the housing is rotatably connected with a box door, a monitoring device is arranged inside the housing, the monitoring device includes an air extraction pump, a filter, a first particulate matter sensor, a water-gas separator, a detection pipe for connecting the air extraction pump, the filter, the first particulate matter sensor, and the water-gas separator, and a display screen arranged on the box door. The air extraction pump, the filter, the first particulate matter sensor, and the water-gas separator are all arranged inside the housing and fixedly connected to the housing. The first particulate matter sensor is electrically connected to the display screen. An air inlet pipe is arranged on one side of the water-gas separator and is internally connected to the water-gas separator.

[0006] In a possible implementation manner, a detection cavity is arranged inside the first particulate matter sensor, and the detection pipe is internally connected to the detection cavity;

[0007] It further includes a zero calibration component, which includes a filter membrane, a membrane cover plate, a capillary tube with one end communicating with the inside of the detection chamber, and a solenoid valve disposed on the detection tube between the first particulate matter sensor and the water-gas separator. There is a receiving space on one side of the first particulate matter sensor, and a cleaning air hole is provided on the side surface of the receiving space. The other end of the capillary tube communicates with the cleaning air hole, and the filter membrane and the membrane cover plate are sequentially disposed inside the receiving space.

[0008] In a possible implementation manner, a spare monitoring component is further provided inside the housing. The spare monitoring component includes a second particulate matter sensor having the same structure as the first particulate matter sensor, a first gas diverter, a spare tube, and a switching housing. The first gas diverter is disposed on the detection tube between the first particulate matter sensor and the filter, and the switching housing is disposed on the detection tube between the first particulate matter sensor and the water-gas separator. One end of the spare tube communicates with the first gas diverter, and the other end of the spare tube communicates with the inside of the switching housing. The second particulate matter sensor is disposed on the spare tube, and the second particulate matter sensor is electrically connected to the display screen. A switching component for inputting gas into the first particulate matter sensor or into the second particulate matter sensor is provided inside the switching housing.

[0009] In a possible implementation manner, the switching component includes an electric push rod, a light shaft, and closed sections disposed on both sides of the light shaft. A flow cavity is provided inside the switching housing. A detection cavity and a spare cavity are respectively provided on both sides of the flow cavity. The flow cavity, the detection cavity, and the spare cavity are communicated through a flow port. The inner diameter of the flow port is larger than the diameter of the light shaft and smaller than the diameter of the closed section. The detection tube and the spare tube are respectively communicated with the detection cavity and the spare cavity. The detection tube on the water-gas separator is communicated with the inside of the flow cavity. The telescopic rod of the electric push rod is fixedly connected to one of the closed sections.

[0010] In a possible implementation manner, first sealing inclined surfaces are respectively provided on both sides of the flow port close to the spare cavity and the detection cavity, and a sealing gasket is provided inside the first sealing inclined surface. Second sealing inclined surfaces that are in contact with the sealing gasket are provided on opposite sides of the two closed sections.

[0011] A receiving groove is provided on the side of the switching housing away from the electric push rod, and a first elastic member is provided inside the receiving groove. The other closed section is slidably connected to the inner wall of the receiving groove and abuts against the first elastic member.

[0012] In a possible implementation, an annular slide rail is fixedly connected inside the filter, a rotating plate is rotatably connected inside the annular slide rail, a plurality of filter meshes are arranged on the rotating plate in a circumferential manner with the rotating plate as the center, the detection tube is divided into a first detection tube and a second detection tube inside the filter, and the opposite sides of the first detection tube and the second detection tube respectively abut against the two sides of the rotating plate. The interiors of the first detection tube and the second detection tube are communicated through the filter meshes on the rotating plate. A rotating assembly for switching between the filter meshes is further provided inside the filter.

[0013] In a possible implementation, receiving blocks are fixedly connected to the opposite sides of the first detection tube and the second detection tube. A sealing assembly is provided on the side of the receiving block close to the rotating plate. The sealing assembly includes an annular sealing block, a sealing ring, and a plurality of second elastic members. A ring-shaped receiving groove is provided on the side of the receiving block close to the rotating plate. One end of each second elastic member is fixedly connected to the side surface of the ring-shaped receiving groove, and the other end of each second elastic member is fixedly connected to the annular sealing block. The annular sealing block is slidably connected to the inner wall of the ring-shaped receiving groove. Annular grooves are provided on the periphery of the rotating plate close to each filter mesh, and the sealing ring is arranged inside the annular groove. The annular sealing block abuts against the sealing ring. A first annular inclined surface is provided on the periphery of the annular groove, and a second annular inclined surface for sliding connection with the first annular inclined surface is provided on the outer surface of the annular sealing block.

[0014] In a possible implementation, the rotating assembly includes a worm gear, a worm meshing with the worm gear, a micro motor, and a support plate. The support plate is fixedly connected to the inside of the filter. The worm gear is rotatably connected to the support plate through a rotating shaft, and the other end of the rotating shaft is fixedly connected to the rotating plate. A support block is fixedly connected to the top of the support plate. The worm is rotatably connected to the support block. The micro motor is fixed to the side of the support block, and the output end of the micro motor is fixedly connected to the worm.

[0015] In a possible implementation, an air jet assembly for cleaning the particulate matter on the filter mesh is further provided inside the filter. The air jet assembly includes a second gas diverter, an air jet pipe, a discharge pipe, and a one-way valve. The second gas diverter is arranged on the second detection tube, one end of the air jet pipe is communicated with the inside of the second gas diverter, the other end of the air jet pipe abuts against the rotating plate, and the inside of the air jet pipe faces one of the filter meshes. One side of the discharge pipe abuts against the rotating plate, and the position of the discharge pipe corresponds to the position of the air jet pipe. The one-way valve is arranged on the air jet pipe, and the outlet of the one-way valve faces the direction of the rotating plate.

[0016] A collection component is further provided at the bottom of the filter. The collection component includes a collection shell and a partition plate. The interior of the collection shell is slidably connected to the outer surface of the filter. The partition plate is fixedly connected to the interior of the filter. One side of the discharge pipe penetrates through the partition plate and extends into the interior of the collection shell. A plurality of sieve meshes are provided at the bottom of the collection shell. The collection shell is fixedly connected to the filter by bolts.

[0017] To achieve online zero calibration of oil fume particles, the present invention also provides an online zero calibration method for an oil fume particle detector. This method utilizes the above-mentioned device and specifically includes the following steps:

[0018] S1. Close the solenoid valve on the detection pipe between the first particle sensor and the water separator.

[0019] S2. Start the air extraction pump.

[0020] S3. Observe the value of the particle sensor on the display screen. When the value returns to zero, open the solenoid valve to continue the measurement.

[0021] The technical solution of the present invention forms a complete detection system by arranging a monitoring device, enabling the oil fume gas to pass through the intake pipe, water separator, detection pipe, particle sensor, filter, and air pump in sequence, ensuring the accuracy and reliability of the detection results. The display screen is set on the cabinet door, facilitating the operator to view the detection data in real time. Compared with the traditional off-line sampling method, this solution does not require sending the sample to the laboratory and can directly perform the detection on-site, greatly shortening the detection time and quickly obtaining the detection results, so that users can monitor the particle concentration in the oil fume in real time, take protective measures in a timely manner or conduct effective emission control, and reduce the negative impact on human health and the environment.

[0022] In addition, the arranged water separator can effectively remove the moisture in the gas inhaled by the intake pipe, thereby improving the detection accuracy of the particle sensor. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for the description of the embodiments or the prior art. Obviously, the following drawings are only some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can be obtained based on the structures shown in these drawings.

[0024] Figure 1 It is a schematic structural diagram of the first embodiment;

[0025] Figure 2 It is a schematic structural diagram of the first particle sensor in the first embodiment;

[0026] Figure 3Schematic diagram of the partial structure decomposition of the first particulate matter sensor in Embodiment 1;

[0027] Figure 4 Schematic diagram of the structure of Embodiment 2;

[0028] Figure 5 Cross-sectional view of the switching housing in Embodiment 2;

[0029] Figure 6 Partial mechanism cross-sectional view of the filter in Embodiment 3;

[0030] Figure 7 Exploded view of the rotating plate and the sealing assembly in Embodiment 3;

[0031] Figure 8 Cross-sectional view of the rotating plate, the first detection tube, and the second detection tube in Embodiment 3;

[0032] Figure 9 For Figure 8 Enlarged view of part A in

[0033] Figure 10 Schematic diagram of the structure of the rotating assembly in Embodiment 3;

[0034] Figure 11 Exploded view of the filter and the collection housing in Embodiment 3.

[0035] Explanation of the reference numerals in the drawings: 1. Housing; 101. Door; 1011. Display screen; 102. Air extraction pump; 103. Filter; 104. First particulate matter sensor; 105. Detection tube; 1051. First detection tube; 1052. Second detection tube; 106. Water-vapor separator; 107. Intake pipe;

[0036] 2. Detection chamber; 201. Filter membrane; 202. Membrane cover plate; 203. Capillary tube; 204. Solenoid valve; 205. Accommodation space; 206. Cleaning air hole;

[0037] 3. Second particulate matter sensor; 301. First gas diverter; 302. Spare pipe; 303. Switching housing; 304. Electric push rod; 305. Optical axis; 306. Closed section; 307. Flow chamber; 308. First detection chamber; 309. Spare chamber; 310. Flow port; 312. First sealing inclined surface; 313. Second sealing inclined surface; 314. Accommodation groove; 315. First elastic member;

[0038] 4. Annular slide rail; 401. Rotating plate; 402. Filter screen; 403. Accommodation block; 404. Annular sealing block; 405. Second elastic member; 406. Sealing ring; 407. Annular accommodation groove; 408. Annular groove; 409. First annular inclined surface; 410. Second annular inclined surface;

[0039] 5. Worm gear; 501. Worm; 502. Support plate; 503. Rotating shaft; 504. Support block; 505. Micro motor

[0040] 6. Second gas diverter; 601. Jet pipe; 602. Discharge pipe; 603. Check valve; 604. Collection shell; 605. Partition plate; 606. Sieve mesh; 607. Bolt

[0041] The realization, functional features and advantages of the object of the present invention will be further described with reference to the embodiments and the accompanying drawings Detailed implementation manners

[0042] In order to make the object, technical solutions and advantages of the present application clearer, the present application will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application and are not used to limit the present application

[0043] Embodiment 1

[0044] The present invention provides an oil fume particulate matter detector. Refer to Figures 1-3 , which includes a housing 1. A box door 101 is rotatably connected to one side of the housing 1. A monitoring device is provided inside the housing 1. The monitoring device includes an air extraction pump 102, a filter 103, a first particulate matter sensor 104 (the first particulate matter sensor 104 can be an optical particulate matter sensor), a water-gas separator 106, a detection pipe 105 for connecting the air extraction pump 102, the filter 103, the first particulate matter sensor 104, and the water-gas separator 106, and a display screen 1011 provided on the box door 101. The air extraction pump 102, the filter 103, the first particulate matter sensor 104, and the water-gas separator 106 are all provided inside the housing 1 and fixedly connected to the housing 1. Since the oil fume gas may contain moisture, the moisture may scatter light, affecting the accurate measurement of the scattered light of the particulate matter and resulting in a higher measured particulate matter concentration. Therefore, the water-gas separator 106 is provided in this solution. It should be noted that the main function of the water-gas separator 106 is to remove moisture (such as water vapor and water droplets) in the gas, and it cannot separate the particulate matter in the gas

[0045] The first particulate matter sensor 104 is electrically connected to the display screen 1011. An intake pipe 107 is provided on one side of the water-gas separator 106, and the intake pipe 107 is internally connected to the water-gas separator 106. An exhaust pipe is provided on the side of the air pump away from the detection pipe 105 for discharging the filtered gas

[0046] When the detector is in use, after starting the air extraction pump 102, the air extraction pump 102 will generate negative pressure inside the detection tube 105 and the intake pipe 107. Under the action of the external pressure difference, the oil fume gas enters the water-gas separator 106 through the intake pipe 107. After passing through the water-gas separator 106, the liquid water is removed, and the separated flue gas enters the first particulate matter sensor 104 through the detection tube 105 for detection. The first particulate matter sensor 104 displays the detection result on the display screen 1011. The detected flue gas then enters the filter 103 through the detection tube 105 to remove the oil fume particulate matter, ensuring the cleanliness of the gas entering the air pump and extending the service life of the air pump. Finally, after passing through the air pump, the flue gas is discharged through the outlet pipe.

[0047] Through the set monitoring device, the oil fume gas passes through the intake pipe 107, the water-gas separator 106, the detection tube 105, the particulate matter sensor, the filter 103 and the air pump in sequence, forming a complete detection system to ensure the accuracy and reliability of the detection result. The display screen 1011 is set on the cabinet door 101, facilitating the operator to view the detection data in real time. Compared with the traditional off-line sampling method, this solution does not need to send the sample to the laboratory and can directly perform the detection on site, greatly shortening the detection time and quickly obtaining the detection result, so that the user can monitor the particulate matter concentration in the oil fume in real time, take protective measures in time or carry out effective emission control, reducing the negative impact on human health and the environment.

[0048] In addition, the set water-gas separator 106 can effectively remove the moisture in the gas inhaled by the intake pipe 107, thereby improving the detection accuracy of the particulate matter sensor.

[0049] Furthermore, a detection chamber 2 is provided inside the first particulate matter sensor 104. The detection tube 105 is internally connected to the detection chamber 2. An optical detection component for detecting the particulate matter concentration is also provided inside the detection chamber 2, which usually includes a light emitter, a light trap, and a light detector. The specific detection principle is the existing technology well-known to those skilled in the art, so it will not be elaborated here;

[0050] It also includes a zero calibration component. The zero calibration component includes a filter membrane 201, a membrane cover 202, a capillary tube 203 with one end internally connected to the detection chamber 2, and a solenoid valve 204 provided on the detection tube 105 between the first particulate matter sensor 104 and the water-gas separator 106. A receiving space 205 is provided on one side of the first particulate matter sensor 104. A cleaning air hole 206 is provided on the side surface of the receiving space 205. The other end of the capillary tube 203 is connected to the cleaning air hole 206. The filter membrane 201 and the membrane cover 202 are sequentially arranged inside the receiving space 205. The membrane cover 202 can be fixedly connected to the receiving space 205 through a bolt 607 to ensure the firmness of the fixed filter membrane 201. It should be noted that the material of the capillary tube 203 can be polytetrafluoroethylene or silicone rubber.

[0051] When zero-calibrating the first particulate matter sensor 104, the user closes the solenoid valve 204 on the detection tube 105 between the first particulate matter sensor 104 and the water-gas separator 106, and starts the air extraction pump 102. The air extraction pump 102 will create a negative pressure in the detection chamber 2 inside the first particulate matter sensor 104. Under the action of the external atmospheric pressure, the external gas will enter the cleaning air hole 206 through the filter diaphragm 201, so that the gas enters the detection chamber 2 through the capillary tube 203, thereby blowing off the particulate matter adhering to the optical device in the detection chamber 2, and thus realizing the zero self-calibration of the optical detection system. This zero-calibration method is easy to operate, can effectively improve the accuracy of detection data, and avoid the deviation of detection results caused by the zero drift of the sensor.

[0052] The provided diaphragm can filter the gas entering the capillary tube 203 to prevent it from secondarily contaminating the optical device in the detection chamber 2, thereby reducing the time required for zero-calibrating the first particulate matter sensor 104 and improving the practicability.

[0053] It should be noted that the side of the capillary tube 203 close to the detection chamber 2 should be located at the edge position of the detection chamber 2. In this way, the dilution effect of the zero-calibration gas blown in from the capillary tube 203 on the pollutant concentration in the detection area is small, and thus the influence on the detection result is also small.

[0054] At the same time, to avoid this influence, a micro solenoid valve can be set on the capillary tube 203. When the particulate matter sensor detects the particulate matter content in the atmosphere, the micro solenoid valve can be in a closed state, so as to ensure that no gas enters the inside of the capillary tube 203, thereby avoiding its influence on the detection effect of the sensor. During zero-calibration, the micro solenoid valve is opened.

[0055] Secondly, a main control board can be set on the outer side of the housing 1, and the solenoid valve 204 and the micro solenoid valve are respectively electrically connected to the main control board, so that the user can control the opening and closing states of the two solenoid valves 204.

[0056] Embodiment 2:

[0057] On the basis of Embodiment 1, refer to Figures 4-5, in this embodiment, a backup monitoring component is further arranged inside the housing 1. The backup monitoring component includes a second particulate matter sensor 3 having the same structure as the first particulate matter sensor 104, a first gas diverter 301, a backup pipe 302, and a switching housing 303. The first gas diverter 301 is arranged on the detection pipe 105 between the first particulate matter sensor 104 and the filter 103. The switching housing 303 is arranged on the detection pipe 105 between the first particulate matter sensor 104 and the water-vapor separator 106. One end of the backup pipe 302 is communicated with the first gas diverter 301, and the other end of the backup pipe 302 is communicated with the inside of the switching housing 303. The second particulate matter sensor 3 is arranged on the backup pipe 302. The second particulate matter sensor 3 is electrically connected to the display screen 1011. A switching component for inputting gas into the first particulate matter sensor 104 or into the second particulate matter sensor 3 is arranged inside the switching housing 303.

[0058] The setting of the backup monitoring component greatly improves the reliability of the detector during operation. When the first particulate matter sensor 104 fails or needs maintenance, the gas can be introduced into the second particulate matter sensor 3 for detection through the switching component, ensuring that the detection work is uninterrupted, and providing continuous and reliable data support for environmental supervision and production safety.

[0059] Specifically, the switching component includes an electric push rod 304, a optical axis 305, and closed sections 306 arranged on both sides of the optical axis 305. A circulation cavity 307 is arranged inside the switching housing 303. A detection cavity 308 and a backup cavity 309 are respectively arranged on both sides of the circulation cavity 307. The circulation cavity 307, the detection cavity 308, and the backup cavity 309 are communicated through a circulation port 310. The inner diameter of the circulation port 310 is larger than the diameter of the optical axis 305 and smaller than the diameter of the closed section 306. The detection pipe 105 and the backup pipe 302 are respectively communicated with the detection cavity 308 and the backup cavity 309. The detection pipe 105 on the water-vapor separator 106 is communicated with the inside of the circulation cavity 307. The telescopic rod of the electric push rod 304 is fixedly connected to one of the closed sections 306.

[0060] When the second particulate matter sensor 3 is damaged or needs to be repaired, the user can activate the electric push rod 304, and the telescopic rod of the electric push rod 304 will simultaneously push the two closing segments 306 and the optical axis 305 to move. Since the diameter of the closing segment 306 is larger than the inner diameter of the flow port 310, the closing segment 306 in the standby chamber 309 will directly close the flow port 310, thereby preventing the flue gas from entering the second particulate matter sensor 3 through the standby pipe 302. At the same time, the closing segment 306 in the detection chamber 308 will move away from the flow port 310, enabling the communication between the flow chamber 307, the flow port 310, and the detection chamber 308, and further allowing the flue gas to enter the first particulate matter sensor 104 through the detection pipe 105 for detection. The switching assembly controls the movement of the optical axis 305 and the closing segment 306 through the electric push rod 304 to achieve the precise switching of the gas between the first particulate matter sensor 104 and the second particulate matter sensor 3. When the first particulate matter sensor 104 needs to be repaired, similarly, the telescopic rod of the electric push rod 304 can be retracted.

[0061] Moreover, the electric push rod 304 can also be electrically connected to the main control board for the user to operate. The switching mechanism can only allow the flue gas to pass through one of the first particulate matter sensor 104 or the second particulate matter sensor 3, and cannot introduce the flue gas into both sensors simultaneously. That is, when the detection chamber 308 is opened, the standby chamber 309 is closed; when the standby chamber 309 is opened, the detection chamber 308 is closed.

[0062] When the air extraction pump 102 is operating, the air extraction pump 102 will generate negative pressure inside the standby pipe 302 and the detection pipe 105 through the first gas diverter 301. When the switching mechanism closes the detection chamber 308, since the detection pipe 105 on the first particulate matter sensor 104 is in a closed state, the gas will enter the capillary tube 203 through the filter membrane 201 under the action of the external air pressure, automatically zeroing the first particulate matter sensor 104. When the first particulate matter sensor 104 or the second particulate matter sensor 3 needs to be zeroed, the switching mechanism can be used to automatically zero one of the particulate matter sensors, thereby improving the practicality of the system.

[0063] Secondly, a second solenoid valve can be provided on the detection pipe 105 between the first particulate matter sensor 104 and the first gas diverter 301, and a third solenoid valve can be provided on the standby pipe 302 between the second particulate matter sensor 3 and the first gas diverter 301. When it is not necessary to zero the first particulate matter sensor 104 or the second particulate matter sensor 3, and only repair or maintenance is required, the corresponding second solenoid valve or third solenoid valve can be closed.

[0064] In this embodiment, first sealing inclined surfaces 312 are provided on both sides of the circulation port 310 close to the standby cavity 309 and the first detection cavity 308 respectively. A sealing gasket is provided inside the first sealing inclined surfaces 312, and second sealing inclined surfaces 313 that are in contact with the sealing gasket are provided on one side of the two closed sections 306 facing each other.

[0065] On one side of the switching housing 303 away from the electric push rod 304 inside, a receiving groove 314 is provided, and a first elastic member 315 is provided inside the receiving groove 314. The other closed section 306 is slidably connected to the inner wall of the receiving groove 314 and abuts against the first elastic member 315.

[0066] By providing the first sealing inclined surfaces 312, the second sealing inclined surfaces 313 and the sealing gasket, the contact area between the closed section 306 and the circulation port 310 can be increased, ensuring that the two are closely fitted, preventing gas leakage, and ensuring that the gas can enter the corresponding sensor along a predetermined path. At the same time, the provided first elastic member 315 can buffer the impact force generated when the telescopic rod of the electric push rod 304 extends, thereby ensuring the reliability and stability of the optical axis 305 and the closed section 306 during long-term use.

[0067] Embodiment Three:

[0068] On the basis of Embodiment One, referring to Figures 6-11 , in this embodiment, an annular slide rail 4 is fixedly connected inside the filter 103. A rotating plate 401 is rotatably connected inside the annular slide rail 4. A plurality of filter meshes 402 are provided on the rotating plate 401 in a circumferential manner with the rotating plate 401 as the center. The detection tube 105 is divided into a first detection tube 1051 and a second detection tube 1052 inside the filter 103. The opposite sides of the first detection tube 1051 and the second detection tube 1052 are in contact with both sides of the rotating plate 401 respectively. The interiors of the first detection tube 1051 and the second detection tube 1052 are communicated through the filter meshes 402 on the rotating plate 401. A rotating assembly for switching between the filter meshes 402 is further provided inside the filter 103.

[0069] When a certain filter mesh 402 is blocked, the rotating plate 401 is rotated through the rotating assembly, and other clean filter meshes 402 are switched between the first detection tube 1051 and the second detection tube 1052, ensuring the continuous normal operation of the filter 103, eliminating the need for manual replacement of the filter meshes 402, reducing the time required for replacing the filter meshes 402, improving the detection efficiency, and extending the service life of the filter 103.

[0070] Further, on the opposite sides of the first detection tube 1051 and the second detection tube 1052, there are fixedly connected accommodation blocks 403. On the side of the accommodation block 403 close to the rotating plate 401, there is a sealing assembly. The sealing assembly includes an annular sealing block 404, a sealing ring 406, and a number of second elastic members 405. On the side of the accommodation block 403 close to the rotating plate 401, there is an annular accommodation groove 407. One end of each second elastic member 405 is fixedly connected to the side surface of the annular accommodation groove 407, and the other end of each second elastic member 405 is fixedly connected to the annular sealing block 404. And the annular sealing block 404 is slidably connected to the inner wall of the annular accommodation groove 407. On the periphery of the rotating plate 401 close to each filter screen 402, there are annular grooves 408, and the sealing ring 406 is arranged inside the annular groove 408. The annular sealing block 404 abuts against the sealing ring 406. On the periphery of the annular groove 408, there is a first annular inclined surface 409, and on the outer surface of the annular sealing block 404, there is a second annular inclined surface 410 that slidably connects with the first annular inclined surface 409.

[0071] When the filter screen 402 between the first detection tube 1051 and the second detection tube 1052 is blocked, the user can rotate the rotating plate 401 through the rotating assembly. At the same time, the first annular inclined surface 409 around the annular groove 408 presses the second annular inclined surface 410 on the annular sealing block 404, causing it to gradually move in the direction of compressing the second elastic members 405 until it completely disengages from the inside of the annular groove 408.

[0072] When the replacement groove of the next filter screen 402 is docked with the annular sealing block 404, the annular sealing block 404 is engaged with the annular groove 408 under the action of a number of second elastic members 405 and contacts the sealing ring 406. Since the second elastic members 405 have the ability to recover deformation, they will cause the annular sealing block 404 to always contact the sealing ring 406, thereby improving the sealing performance between the first detection tube 1051, the second detection tube 1052 and the rotating plate 401, reducing the possibility of gas leakage, and ensuring the filtering efficiency of the filter screen 402.

[0073] When replacing the filter screen 402, the rotating assembly only needs to overcome the elastic force of a number of second elastic members 405 to complete the replacement, avoiding complex operations, thereby improving the convenience of operation.

[0074] In this embodiment, the sealing assembly is arranged on the accommodation block 403 instead of in each annular groove 408 on the rotating plate 401, in order to reduce the number of sealing assemblies, thereby reducing the manufacturing cost.

[0075] Specifically, the rotating assembly includes a worm gear 5, a worm 501 meshing with the worm gear 5, a micro motor 505, and a support plate 502. The support plate 502 is fixedly connected to the inside of the filter 103. The worm gear 5 is rotationally connected to the support plate 502 through a rotating shaft 503, and the other end of the rotating shaft 503 is fixedly connected to the rotating plate 401. A support block 504 is fixedly connected to the top of the support plate 502. The worm 501 is rotationally connected to the support block 504. The micro motor 505 is fixed to the side of the support block 504, and the output end of the micro motor 505 is fixedly connected to the worm 501.

[0076] The rotating assembly adopts the combination of the worm gear 5, the worm 501 and the micro motor 505 to realize the automatic control of the switching of the filter screen 402. The micro motor 505 drives the worm gear 5 to rotate through the worm 501, and then drives the rotating plate 401 to rotate. At the same time, the transmission of the worm gear 5 and the worm 501 can provide a large torque so that the rotating plate 401 presses the annular sealing block 404 into the annular placement groove 407.

[0077] In this embodiment, an air jet assembly for cleaning the particulate matter on the filter screen 402 is further arranged inside the filter 103. The air jet assembly includes a second gas diverter 6, an air jet pipe 601, a discharge pipe 602, and a one-way valve 603. The second gas diverter 6 is arranged on the detection two-pipe 1052, and one end of the air jet pipe 601 is communicated with the inside of the second gas diverter 6. The other end of the air jet pipe 601 abuts against the rotating plate 401, and the inside of the air jet pipe 601 faces one of the filter screens 402. One side of the discharge pipe 602 abuts against the rotating plate 401, and the position of the discharge pipe 602 corresponds to the position of the air jet pipe 601. The one-way valve 603 is arranged on the air jet pipe 601, and the outlet of the one-way valve 603 faces the direction of the rotating plate 401. The purpose of arranging the one-way valve 603 is to avoid the generation of negative pressure inside the air jet pipe 601 and ensure that the air jet pipe 601 can only blow air.

[0078] A collection assembly is further arranged at the bottom of the filter 103. The collection assembly includes a collection shell 604 and a partition plate 605. The inside of the collection shell 604 is slidably connected to the outer surface of the filter 103. The partition plate 605 is fixedly connected to the inside of the filter 103. One side of the discharge pipe 602 penetrates through the partition plate 605 and extends into the inside of the collection shell 604. A plurality of sieve meshes 606 are arranged at the bottom of the collection shell 604. The collection shell 604 is fixedly connected to the filter 103 through bolts 607.

[0079] The provided air jet pipe 601 can clean the particulate matter on the filter screen 402. By jetting air from the air jet pipe 601 towards the filter screen 402, the particulate matter is blown off and then enters the collection assembly through the discharge pipe 602. The collection shell 604 and the sieve 606 in the collection assembly can effectively collect the particulate matter. The pores on the sieve 606 mainly ensure that the gas can be discharged from the interior of the filter 103. Connecting the collection shell 604 to the filter 103 through bolts 607 is to facilitate the user to disassemble the collection shell 604 for cleaning the particulate matter inside.

[0080] The specific principle is as follows:

[0081] When the air extraction pump 102 operates, it will create a negative pressure inside the second gas diverter 6, the detection pipe 105, the first particulate matter sensor 104, and the air inlet pipe 107. Due to the existence of the one-way valve 603, the air jet pipe 601 cannot generate a negative pressure inside. The oil fume gas will enter the interior of the detection pipe 1051 of the filter 103 through the detection pipe 105 and enter the interior of the detection pipe 1052 through the filtration of the filter screen 402. The particulate matter will adhere to the surface of the filter screen 402. When the gas enters the interior of the second gas diverter 6, the filtered oil fume gas will be divided into two airflows. One airflow enters the air pump through the detection pipe 1052 and is discharged through the exhaust pipe, and the other airflow will jet air towards the surface of the filter screen 402 through the air jet pipe 601, causing the particulate matter adhering to the side of the filter screen 402 away from the air jet pipe 601 to fall into the interior of the collection shell 604 through the discharge pipe 602.

[0082] In this embodiment of the air jet assembly, there is no need to externally connect an additional air source, which means that there is no need to set up complex air source access pipelines and other related components inside the detector. This greatly simplifies the overall structure of the device, makes the detector smaller in size, and also reduces the cost.

[0083] Secondly, the method of jetting air in the reverse direction can directly impact the particulate matter attached to the filter screen 402, and use the reverse impact force of the air flow to blow the particulate matter out of the pores of the filter screen 402. Compared with the forward air flow, jetting air in the reverse direction can more effectively loosen and remove the particulate matter stubbornly attached to the inner side of the filter screen 402, improve the cleaning efficiency, and ensure that the filtering performance of the filter screen 402 can be continuously maintained.

[0084] In addition, different from the traditional method of disassembling the filter screen 402 for manual cleaning or replacing the filter screen 402, this air jet cleaning method can be carried out during the normal operation of the device without shutting down to disassemble the filter screen 402. This greatly saves the cleaning time and improves the detection efficiency.

[0085] Embodiment 4:

[0086] Based on Embodiment 1, this embodiment proposes an online zero calibration method for an oil fume particulate matter detector, which specifically includes the following steps:

[0087] S1. Close the solenoid valve 204 on the detection pipe 105 between the first particulate matter sensor 104 and the water-air separator 106;

[0088] S2. Start the air extraction pump 102;

[0089] S3. Observe the value of the particulate matter sensor on the display screen 1011. When the value returns to zero, open the solenoid valve 204 to continue the measurement.

[0090] In the attached drawings of this embodiment, the same or similar reference numerals correspond to the same or similar components; in the description of this application, it should be understood that if there are terms such as "upper", "lower", "left", "right", etc. indicating the orientation or positional relationship, they are based on the orientation or positional relationship shown in the attached drawings. This is only for the convenience of describing this application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, the terms describing the positional relationship in the attached drawings are only for illustrative purposes and cannot be understood as a limitation of this patent. For those of ordinary skill in the art, the specific meanings of the above terms can be understood according to specific circumstances.

[0091] The above is only a preferred embodiment of this application and is not intended to limit this application. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of this application shall be included in the protection scope of this application.

Claims

1. An oil fume particulate matter detector, comprising a housing (1), one side of the housing (1) is rotatably connected with a box door (101), and it is characterized in that: Inside the housing (1), there is a monitoring device, which includes an air extraction pump (102), a filter (103), a first particulate matter sensor (104), a water-vapor separator (106), a detection tube (105) for connecting the air extraction pump (102), the filter (103), the first particulate matter sensor (104), and the water-vapor separator (106), and a display screen (1011) provided on the cabinet door (101). The air extraction pump (102), the filter (103), the first particulate matter sensor (104), and the water-vapor separator (106) are all arranged inside the housing (1) and fixedly connected to the housing (1). The first particulate matter sensor (104) is electrically connected to the display screen (1011). On one side of the water-vapor separator (106), there is an intake pipe (107), and the intake pipe (107) is internally connected to the water-vapor separator (106).

2. The oil fume particulate matter detector according to claim 1, wherein: Inside the first particulate matter sensor (104), there is a detection chamber (2), and the detection tube (105) is internally connected to the detection chamber (2); It further includes a zero calibration component, which includes a filter membrane (201), a membrane cover (202), a capillary tube (203) with one end internally connected to the detection chamber (2), and an electromagnetic valve (204) provided on the detection tube (105) between the first particulate matter sensor (104) and the water-vapor separator (106). On one side of the first particulate matter sensor (104), there is a receiving space (205). On the side of the receiving space (205), there is a cleaning air hole (206). The other end of the capillary tube (203) is connected to the cleaning air hole (206). The filter membrane (201) and the membrane cover (202) are sequentially arranged inside the receiving space (205).

3. The oil fume particulate matter detector according to claim 2, characterized in that: Inside the housing (1), there is also a standby monitoring component, which includes a second particulate matter sensor (3) with the same structure as the first particulate matter sensor (104), a first gas diverter (301), a standby tube (302), and a switching housing (303). The first gas diverter (301) is arranged on the detection tube (105) between the first particulate matter sensor (104) and the filter (103). The switching housing (303) is arranged on the detection tube (105) between the first particulate matter sensor (104) and the water-vapor separator (106). One end of the standby tube (302) is connected to the first gas diverter (301), and the other end of the standby tube (302) is internally connected to the switching housing (303). The second particulate matter sensor (3) is arranged on the standby tube (302). The second particulate matter sensor (3) is electrically connected to the display screen (1011). Inside the switching housing (303), there is a switching component for inputting gas into the first particulate matter sensor (104) or into the second particulate matter sensor (3).

4. The oil fume particulate matter detector according to claim 3, characterized in that: The switching component includes an electric push rod (304), a optical axis (305), and closed sections (306) arranged on both sides of the optical axis (305). A circulation cavity (307) is provided inside the switching housing (303). Detection cavities (2) and a spare cavity (309) are respectively provided on both sides of the circulation cavity (307). The circulation cavity (307), the detection cavities (2), and the spare cavity (309) are communicated through circulation ports (310). The inner diameter of the circulation ports (310) is greater than the diameter of the optical axis (305) and less than the diameter of the closed sections (306). The detection pipes (105) and the spare pipes (302) are respectively communicated with the detection cavities (2) and the spare cavity (309). The detection pipes (105) on the water-air separator (106) are communicated with the inside of the circulation cavity (307). The telescopic rod of the electric push rod (304) is fixedly connected to one of the closed sections (306).

5. The oil fume particulate matter detector according to claim 4, characterized in that: First sealing inclined surfaces (312) are provided on both sides of the circulation ports (310) close to the spare cavity (309) and the detection cavities (2) respectively. Sealing gaskets are provided inside the first sealing inclined surfaces (312). Second sealing inclined surfaces (313) that are in contact with the sealing gaskets are provided on one side of each of the two closed sections (306) facing each other; On one side of the inside of the switching housing (303) far from the electric push rod (304), a receiving groove (314) is provided. A first elastic member (315) is provided inside the receiving groove (314). The other closed section (306) is slidably connected to the inner wall of the receiving groove (314) and is in contact with the first elastic member (315).

6. The oil fume particulate matter detector according to claim 4, wherein: An annular slide rail (4) is fixedly connected inside the filter (103). A rotating plate (401) is rotatably connected inside the annular slide rail (4). A plurality of filter meshes (402) arranged circumferentially with the rotating plate (401) as the center are provided on the rotating plate (401). The detection pipe (105) is divided into a first detection pipe (1051) and a second detection pipe (1052) inside the filter (103). One side of the first detection pipe (1051) and the second detection pipe (1052) facing each other are respectively in contact with both sides of the rotating plate (401). The inside of the first detection pipe (1051) and the second detection pipe (1052) are communicated through the filter meshes (402) on the rotating plate (401). A rotating component for switching between the filter meshes (402) is further provided inside the filter (103).

7. The oil fume particulate matter detector according to claim 6, wherein: On the opposite sides of the detection tube one (1051) and the detection tube two (1052), there are fixedly connected accommodation blocks (403). On the side of the accommodation block (403) close to the rotating plate (401), there is a sealing assembly. The sealing assembly includes an annular sealing block (404), a sealing ring (406), and a number of second elastic members (405). On the side of the accommodation block (403) close to the rotating plate (401), there is an annular accommodation groove (407). One end of each of the second elastic members (405) is fixedly connected to the side surface of the annular accommodation groove (407), and the other end of each of the second elastic members (405) is fixedly connected to the annular sealing block (404), and the annular sealing block (404) is slidably connected to the inner wall of the annular accommodation groove (407). On the periphery of the rotating plate (401) close to each filter screen (402), there is an annular groove (408), and the sealing ring (406) is arranged inside the annular groove (408). The annular sealing block (404) abuts against the sealing ring (406). On the periphery of the annular groove (408), there is a first annular inclined surface (409), and on the outer surface of the annular sealing block (404), there is a second annular inclined surface (410) that is slidably connected to the first annular inclined surface (409).

8. The oil fume particulate matter detector according to claim 7, wherein: The rotation assembly includes a worm gear (5), a worm (501) meshing with the worm gear (5), a micro motor (505), and a support plate (502). The support plate (502) is fixedly connected to the inside of the filter (103). The worm gear (5) is rotationally connected to the support plate (502) through a rotating shaft (503), and the other end of the rotating shaft (503) is fixedly connected to the rotating plate (401). At the top of the support plate (502), there is a fixedly connected support block (504). The worm (501) is rotationally connected to the support block (504). The micro motor (505) is fixed to the side surface of the support block (504), and the output end of the micro motor (505) is fixedly connected to the worm (501).

9. The oil fume particulate matter detector according to claim 7, characterized in that: Inside the filter (103), there is also an air jet assembly for cleaning the particulate matter on the filter screen (402). The air jet assembly includes a second gas diverter (6), an air jet pipe (601), a discharge pipe (602), and a check valve (603). The second gas diverter (6) is arranged on the detection tube two (1052), and one end of the air jet pipe (601) is communicated with the inside of the second gas diverter (6). The other end of the air jet pipe (601) abuts against the rotating plate (401), and the inside of the air jet pipe (601) faces one of the filter screens (402). One side of the discharge pipe (602) abuts against the rotating plate (401), and the position of the discharge pipe (602) corresponds to the position of the air jet pipe (601). The check valve (603) is arranged on the air jet pipe (601), and the outlet of the check valve (603) faces the direction of the rotating plate (401); A collection component is further provided at the bottom of the filter (103). The collection component includes a collection shell (604) and a partition plate (605). The interior of the collection shell (604) is slidably connected to the outer surface of the filter (103). The partition plate (605) is fixedly connected to the interior of the filter (103). One side of the discharge pipe (602) penetrates through the partition plate (605) and extends into the interior of the collection shell (604). A plurality of sieve meshes (606) are provided at the bottom of the collection shell (604). The collection shell (604) is fixedly connected to the filter (103) by bolts (607).

10. An on-line zero calibration method for an oil fume particulate matter detector, comprising the oil fume particulate matter detector according to any one of claims 1 to 9, characterized in that: Specifically, it includes the following steps: S1. Close the solenoid valve (204) on the detection pipe (105) between the first particulate matter sensor (104) and the water-air separator (106); S2. Start the air extraction pump (102); S3. Observe the value of the particulate matter sensor on the display screen (1011). When the value returns to zero, open the solenoid valve (204) to continue the measurement.

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