Extraction type particulate matter measuring instrument

Abstract

The invention provides an extraction type particulate matter measuring instrument. The extraction type particulate matter measuring instrument comprises a measuring cavity, a sampling probe assembly, a detection probe assembly, an air pump assembly, an annular light scattering light path assembly and an annular light scattering adjustment mechanism, the sampling probe assembly, the detection probe assembly and the air pump assembly are detachably mounted at the upper end of the measuring cavity, a measuring chamber is arranged at the lower end of the measuring cavity, and the sampling probe assembly and the air pump assembly are communicated with the measuring chamber; the annular light scattering light path assembly comprises a transmitting unit and a receiving unit, the transmitting unit and the receiving unit are arranged on the two sides of the measuring chamber respectively, and light emitted by the transmitting unit is received by the receiving unit after passing through the measuring chamber. Through multiple technical innovations, the measurement precision, the environmental adaptability, the multi-parameter measurement capability, the installation and maintenance convenience and the cleaning and protection performance of the particulate matter measurement instrument are remarkably improved, and an efficient, reliable and easy-to-maintain particulate matter measurement solution is provided.

Description

Technical Field

[0001] The present invention relates to the technical field of environmental monitoring equipment, and in particular to an extraction type particle measuring instrument. Background Art

[0002] With the increasing awareness of environmental protection, the monitoring of atmospheric pollutants, especially particulate matter, has become increasingly important. Traditional methods for measuring particulate matter mainly include weight method, optical method, etc. Among them, the optical method is widely used in the field of environmental monitoring due to its non-contact, fast response speed, and easy operation. However, existing optical particulate matter measuring instruments still have some problems in practical applications, such as low measurement accuracy, susceptibility to environmental factors, and inconvenient maintenance.

[0003] Deficiencies of existing technology: 1. Insufficient measurement accuracy: Traditional particle measurement instruments may have large background light interference due to unreasonable optical path design, affecting the measurement accuracy; in addition, the lack of an effective calibration mechanism can also lead to deviations in measurement results.

[0004] 2. Poor environmental adaptability: In high temperature, high pressure or corrosive environments, the performance of traditional measuring instruments will be significantly reduced or even fail to work properly. For example, the sampling probe is easily contaminated, resulting in measurement errors.

[0005] 3. Limited multi-parameter measurement capabilities: Existing measuring instruments can usually only measure particulate matter concentration alone, and it is difficult to simultaneously measure other important parameters such as sample gas temperature, pressure and flow.

[0006] 4. Inconvenient installation and maintenance: The installation and maintenance process of traditional instruments is relatively complicated, requiring frequent disassembly and calibration, which increases the difficulty and cost of operation.

[0007] 5. Weak anti-interference ability: The optical path design and calibration mechanism of traditional instruments are not perfect, and they are easily interfered by external environmental factors (such as temperature and humidity changes), resulting in unstable measurement results.

[0008] 6. Insufficient cleaning and protection measures: The sensor window and optical components are easily contaminated, and lack of effective protection measures affects the stability and reliability of long-term use.

[0009] Therefore, the prior art has deficiencies and needs further improvement. Summary of the invention

[0010] In view of the problems existing in the prior art, the present invention provides an extraction type particle measuring instrument.

[0011] To achieve the above object, the specific scheme of the present invention is as follows: The present invention provides an extractable particle measuring instrument, comprising: Measuring cavity, sampling probe assembly, detection probe assembly, air pump assembly, annular light scattering optical path assembly, annular light scattering adjustment mechanism; The sampling probe assembly, the detection probe assembly, and the air pump assembly are detachably mounted on the upper end of the measuring cavity, a measuring chamber is provided at the lower end of the measuring cavity, and the sampling probe assembly and the air pump assembly are in communication with the measuring chamber; The annular light scattering optical path assembly includes a transmitting unit and a receiving unit, which are respectively arranged on both sides of the measuring chamber, and the light emitted by the transmitting unit is received by the receiving unit after passing through the measuring chamber; The annular light scattering adjustment mechanism is arranged between the transmitting unit and the receiving unit during adjustment, and is used to calibrate the annular light scattering optical path component; The sampling probe assembly is used to collect sample gas and inject it into the measuring chamber, the detection probe assembly is used to detect temperature, pressure, and flow rate, the air pump assembly is used to provide extraction power for the sampling probe assembly, the annular light scattering optical path assembly is used to detect the concentration of particulate matter in the measuring chamber, and the annular light scattering adjustment mechanism is used to calibrate the annular light scattering optical path assembly.

[0012] Furthermore, a cover is provided at the lower end of the measuring chamber.

[0013] Further, the detection probe assembly includes a back pressure tube and a full pressure tube; The opening of the full-pressure pipe faces the side from which the fluid comes, and the opening of the back-pressure pipe faces away from the side from which the fluid comes.

[0014] Further, the sampling probe assembly includes a sample gas extraction pipeline and a first heating tube; The sample gas extraction pipeline is connected to the measuring chamber, and a curved nozzle is also arranged at the front end of the sample gas extraction pipeline, and the curved nozzle faces the side of the fluid; The first heating tube is arranged on the side of the sample gas extraction pipeline and is used to heat the extracted sample gas.

[0015] Furthermore, the air pump assembly is also provided with a first channel, an air outlet, a negative pressure port, and a compressed air inlet; The air outlet and the negative pressure port are respectively arranged at the front end and the rear end of the first channel, and the compressed air inlet is arranged on the side wall of the first channel between the air outlet and the negative pressure port; The compressed air inlet is connected to an external compressed air source, and the compressed air enters the first channel from the compressed air inlet and is discharged from the air outlet to generate negative pressure at the negative pressure port; The negative pressure port is connected to the measuring chamber, and the measuring chamber is connected to the sample gas extraction pipeline of the sampling probe assembly, and the sample gas is extracted into the measuring chamber under the action of negative pressure; The measuring cavity is provided with a sample gas discharge channel, and the gas outlet is connected to the sample gas discharge channel for discharging the sample gas after detection.

[0016] Furthermore, the transmitting unit comprises: a light source, a collimating lens, and an aconic lens; The receiving unit comprises: a receiving lens and a light detector; The light source is used to emit light, and the light passes through the collimating lens and the aconic lens in sequence to form an annular measuring area in the measuring chamber; A sample gas is introduced into the measuring chamber through a sampling probe assembly, and the sample gas contains smoke particles; The scattered light generated by the smoke particles in the annular measurement area reaches the light detector after passing through the receiving lens and is used to evaluate the concentration of particulate matter.

[0017] Further, the annular light scattering adjustment mechanism includes a dimming component; The dimming component is arranged between the transmitting unit and the receiving unit, and is used to adjust the light intensity by changing the light blocking area, so as to achieve the purpose of simulating a specific amount of scattered signal, realize the pickup of the range signal and further realize the calibration function.

[0018] Furthermore, the measuring cavity is also provided with a light gas curtain emitting channel and a light gas curtain receiving channel; The emitting light gas curtain channel and the receiving light gas curtain channel are respectively located at the front side of the conical lens and the front side of the receiving lens, and are used to pass protective gas into the front side of the conical lens and the receiving lens to form a gas curtain for isolation protection.

[0019] Furthermore, a second heating tube is provided in the measuring cavity for heating the entire heating cavity.

[0020] Furthermore, the detection probe assembly is also provided with a temperature sensor; The detection probe assembly and the sampling probe assembly are installed in the measurement cavity at a rotatable angle, and the installation angle is adjusted by rotation; A fluororubber sealing ring is provided between the detection probe assembly and the sampling probe assembly and the measuring cavity for sealing.

[0021] The technical solution of the present invention has the following beneficial effects: 1. High measurement accuracy: Annular light scattering optical path system: Through the new annular light path design, the interference of background light is reduced and the measurement accuracy is improved.

[0022] Annular light scattering adjustment mechanism: The light intensity is adjusted by changing the light blocking area through the dimming component, which effectively reduces the original light interference and light path drift, and improves the accuracy and stability of calibration.

[0023] 2. Strong environmental adaptability: Vacuum air pump as extraction power: suitable for high temperature, high pressure, corrosive environment, ensuring the simplicity and applicability of operation.

[0024] Heating tube design: Heating tubes are set in the sampling probe assembly and the measurement cavity to ensure that the sample gas does not condense under high temperature conditions, avoiding measurement errors.

[0025] Fluorine rubber sealing ring: A fluorine rubber sealing ring is arranged between the detection probe assembly and the sampling probe assembly and the measuring cavity to ensure the sealing and prevent leakage and contamination.

[0026] 3. Multi-parameter measurement capability: Multi-parameter detection probe: The detection probe assembly includes a back pressure tube, a full pressure tube and a temperature sensor, which can simultaneously measure the temperature, pressure and flow rate of the sample gas, providing comprehensive measurement data.

[0027] Measuring chamber flow channel system: Without changing the volume of the measuring chamber, multi-parameter measurement is achieved through optimized structural design, thus improving the overall performance of the instrument.

[0028] 4.Easy installation and maintenance: Detachable design: The sampling probe assembly, detection probe assembly and air pump assembly can all be disassembled and installed, reducing the installation steps and facilitating replacement and maintenance.

[0029] Rotate to adjust the installation angle: The detection probe assembly and the sampling probe assembly can be installed with a rotation angle. By rotating and adjusting the installation angle, it can adapt to different measurement environments and requirements.

[0030] 5. Efficient cleaning protection: Air curtain micro-flow control system: protects the sensor window and optical components by controlling the air curtain with a tiny flow rate, preventing contamination and ensuring long-term stable measurement performance.

[0031] Regular backflush function: The sampling probe and detection probe assembly have regular backflush function to ensure that the internal measurement chamber is clean and the probe is not blocked.

[0032] 6. Continuity and accuracy: Negative pressure extraction and discharge: The air pump assembly draws the sample gas into the measurement chamber through negative pressure, and discharges the sample gas after the test is completed, ensuring the continuity and accuracy of the measurement process.

[0033] Sample gas discharge channel: A sample gas discharge channel is provided on the measuring chamber and connected to the air outlet of the air pump assembly to ensure smooth discharge of the sample gas.

[0034] 7. Compact structure: Integrated design: The sampling probe assembly and the detection probe assembly are integrated and installed directly from the measurement chamber, which reduces the overall volume and makes the instrument more compact and portable. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] Figure 1 is a stereogram of the present invention; Figure 2 is a cross-sectional view of the present invention; Figure 3 is a cross-sectional view of another position of the present invention; Figure 4 It is a cross-sectional view of the third position of the present invention.

[0036] In the figure: 1. Measuring cavity; 2. Air pump assembly; 3. Measuring chamber; 4. Cover; 5. Back pressure tube; 6. Total pressure tube; 7. Sample gas extraction pipeline; 8. First heating tube; 9. Elbow; 10. First channel; 11. Air outlet; 12. Negative pressure port; 13. Compressed air inlet; 14. Sample gas discharge channel; 15. Light source; 16. Collimating lens; 17. Conical lens; 18. Receiving lens; 19. Photodetector; 20. Annular measuring area; 21. Smoke particles; 22. Dimming assembly; 23. Emitting light gas curtain channel; 24. Receiving light gas curtain channel; 25. Second heating tube; 26. First air curtain connector; 27. Second air curtain connector. DETAILED DESCRIPTION

[0037] The present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. It is to be understood that the specific embodiments described herein are only used to explain the present invention, rather than to limit the present invention. It should also be noted that, for ease of description, only parts related to the present invention, rather than all structures, are shown in the accompanying drawings.

[0038] In the description of the present invention, unless otherwise clearly specified and limited, the terms "connected", "connected", and "fixed" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0039] In the present invention, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may include that the first and second features are in direct contact, or may include that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, a first feature being "above", "above" and "above" a second feature includes that the first feature is directly above and obliquely above the second feature, or simply indicates that the first feature is higher in level than the second feature. A first feature being "below", "below" and "below" a second feature includes that the first feature is directly below and obliquely below the second feature, or simply indicates that the first feature is lower in level than the second feature.

[0040] In the description of this embodiment, the terms "upper", "lower", "front", "back", "left", "right" and other directions or positional relationships are based on the directions or positional relationships shown in the drawings, and are only for the convenience of description and simplification of operation, rather than indicating or implying that the device or element referred to must have a specific direction, be constructed and operate in a specific direction, and therefore cannot be understood as limiting the present invention. In addition, the terms "first" and "second" are only used to distinguish in the description and have no special meaning.

[0041] Combination Figure 1-Figure 4 As shown, the present invention provides an extractable particle measurement instrument, comprising: Measuring cavity 1, sampling probe assembly, detection probe assembly, air pump assembly 2, annular light scattering optical path assembly, annular light scattering adjustment mechanism; The sampling probe assembly, the detection probe assembly, and the air pump assembly 2 are detachably mounted on the upper end of the measuring cavity 1. A measuring chamber 3 is provided at the lower end of the measuring cavity 1. The sampling probe assembly and the air pump assembly 2 are in communication with the measuring chamber 3. The annular light scattering optical path assembly includes a transmitting unit and a receiving unit, which are respectively arranged on both sides of the measuring chamber 3, and the light emitted by the transmitting unit passes through the measuring chamber 3 and is received by the receiving unit; The annular light scattering adjustment mechanism is arranged between the transmitting unit and the receiving unit during adjustment, and is used to calibrate the annular light scattering optical path component; The sampling probe assembly is used to collect sample gas and inject it into the measuring chamber 3, the detection probe assembly is used to detect temperature, pressure, and flow rate, the air pump assembly 2 is used to provide extraction power for the sampling probe assembly, the annular light scattering optical path assembly is used to detect the concentration of particulate matter in the measuring chamber 3, and the annular light scattering adjustment mechanism is used to calibrate the annular light scattering optical path assembly.

[0042] A cover 4 is also provided at the lower end of the measuring chamber 3 .

[0043] The detection probe assembly includes a back pressure tube 5 and a full pressure tube 6; The opening of the total pressure pipe 6 faces the side from which the fluid comes, and the opening of the back pressure pipe 5 faces away from the side from which the fluid comes.

[0044] The sampling probe assembly includes a sample gas extraction pipeline 7 and a first heating tube 8; The sample gas extraction pipeline 7 is connected to the measuring chamber 3, and a curved nozzle 9 is also provided at the front end of the sample gas extraction pipeline 7, and the curved nozzle 9 faces the side of the fluid; The first heating tube 8 is arranged on the side of the sample gas extraction pipeline 7 and is used to heat the extracted sample gas.

[0045] The air pump assembly 2 is also provided with a first channel 10, an air outlet 11, a negative pressure port 12, and a compressed air inlet 13; The air outlet 11 and the negative pressure port 12 are respectively arranged at the front end and the rear end of the first channel 10, and the compressed air inlet 13 is arranged on the side wall of the first channel 10 between the air outlet 11 and the negative pressure port 12; The compressed air inlet 13 is connected to an external compressed air source, and the compressed air enters the first channel 10 from the compressed air inlet 13 and is discharged from the air outlet 11 to generate negative pressure at the negative pressure port 12; The negative pressure port 12 is connected to the measuring chamber 3, and the measuring chamber 3 is connected to the sample gas extraction pipeline 7 of the sampling probe assembly, and the sample gas is extracted into the measuring chamber 3 under the action of negative pressure; The measuring cavity 1 is provided with a sample gas discharge channel 14 , and the gas outlet 11 is connected to the sample gas discharge channel 14 for discharging the sample gas after detection.

[0046] The emitting unit comprises: a light source 15, a collimating lens 16, and an aconic lens 17; The receiving unit includes: a receiving lens 18 and a light detector 19; The light source 15 is used to emit light, and the light passes through the collimating lens 16 and the conical lens 17 in sequence to form an annular measuring area 20 in the measuring chamber 3; The sample gas is introduced into the measuring chamber 3 through the sampling probe assembly, and the sample gas contains smoke particles 21; The scattered light generated by the smoke particles 21 in the annular measuring area 20 reaches the light detector 19 after passing through the receiving lens 18 and is used to evaluate the concentration of the particulate matter.

[0047] The annular light scattering adjustment mechanism includes a light adjustment component 22; The dimming component 22 is arranged between the transmitting unit and the receiving unit, and is used to adjust the light intensity by changing the light blocking area, so as to achieve the purpose of simulating a specific amount of scattered signal, realize the pickup of the range signal and further realize the calibration function.

[0048] The measuring chamber 1 is also provided with a light-emitting gas curtain channel 23 and a light-receiving gas curtain channel 24; The emitting light gas curtain channel 23 and the receiving light gas curtain channel 24 are respectively located in front of the conical lens 17 and the receiving lens 18, and are used to pass protective gas in front of the conical lens 17 and the receiving lens 18 to form a gas curtain for isolation protection.

[0049] The measuring cavity 1 is provided with a second heating tube 25 for heating the entire heating cavity.

[0050] The detection probe assembly is also provided with a temperature sensor; The detection probe assembly and the sampling probe assembly are rotatably installed in the measurement cavity 1, and the installation angle is adjusted by rotation; A fluororubber sealing ring is provided between the detection probe assembly and the sampling probe assembly and the measurement cavity 1 for sealing.

[0051] The principle of the present invention is as follows: The present invention proposes an extractable particle measurement instrument, which realizes accurate measurement of particle concentration and other parameters in sample gas through the coordinated operation of multiple components. The following is the detailed working principle: Sampling process: Sampling probe assembly: The sampling probe assembly includes a sample gas extraction pipeline 7 and a first heating tube 8. A bend 9 is provided at the front end of the sample gas extraction pipeline 7, and the bend 9 faces the side of the fluid to more effectively collect the sample gas. The first heating tube 8 is provided on the side of the sample gas extraction pipeline 7 to heat the extracted sample gas to prevent the sample gas from condensing in the pipeline.

[0052] Air pump assembly 2: The air pump assembly 2 includes a first channel 10, an air outlet 11, a negative pressure port 12 and a compressed air inlet 13. Compressed air enters the first channel 10 from the compressed air inlet 13 and is discharged from the air outlet 11, while generating negative pressure at the negative pressure port 12. The negative pressure port 12 is connected to the measuring chamber 3, and the measuring chamber 3 is connected to the sample gas extraction pipeline 7 of the sampling probe. Under the action of negative pressure, the sample gas is extracted into the measuring chamber 3.

[0053] Measurement process: Annular light scattering optical path component: The annular light scattering optical path component includes a light source 15, a collimating lens 16, an aconic lens 17, a receiving lens 18 and a light detector 19. The light emitted by the light source 15 passes through the collimating lens 16 and the aconic lens 17 in sequence to form an annular measurement area 20 in the measurement chamber 3. The smoke particles 21 in the sample gas generate scattered light in the annular measurement area 20. The scattered light passes through the receiving lens 18 and reaches the light detector 19. The light detector 19 converts the scattered light into an electrical signal for evaluating the concentration of particulate matter.

[0054] Annular light scattering adjustment mechanism: The annular light scattering adjustment mechanism includes a dimming component 22. The dimming component 22 adjusts the light intensity by changing the light blocking area to achieve the purpose of simulating a specific amount of scattered signal, thereby realizing the pickup and calibration functions of the range signal.

[0055] Multi-parameter detection: Detection probe assembly: The detection probe assembly includes a back pressure tube 5, a total pressure tube 6 and a temperature sensor. The opening of the total pressure tube 6 faces the side where the fluid comes from, and is used to measure the total pressure of the sample gas; the opening of the back pressure tube 5 faces away from the side where the fluid comes from, and is used to measure the back pressure of the sample gas. The temperature sensor is used to measure the temperature of the sample gas. These parameters are transmitted to the control system through electrical signals to achieve synchronous measurement of the sample gas temperature, pressure and flow rate.

[0056] Cleaning protection: Air curtain micro-flow control system: The measuring cavity 1 is provided with an emission light air curtain channel 23 and a receiving light air curtain channel 24, which are respectively located at the front side of the conical lens 17 and the front side of the receiving lens 18. By introducing protective gas into these channels, an air curtain is formed to isolate and protect the conical lens 17 and the receiving lens 18, prevent the attachment of pollutants, and ensure the cleanliness and long-term stable operation of the optical elements. The outer wall of the measuring cavity 1 is provided with a first air curtain joint 26 and a second air curtain joint 27 respectively connected to the receiving light air curtain channel 24 and the emission light air curtain channel 23.

[0057] Heating and sealing: Heating tube: A second heating tube 25 is provided in the measuring cavity 1 for heating the entire heating cavity to ensure that the temperature of the sample gas and the measuring chamber 3 is constant during the measurement process to avoid condensation and measurement errors.

[0058] Sealing design: A fluororubber sealing ring is provided between the detection probe assembly and the sampling probe assembly and the measuring chamber 1 to ensure sealing and prevent leakage and contamination.

[0059] Sample gas discharge: Sample gas discharge channel 14: The measurement chamber 1 is provided with a sample gas discharge channel 14, which is connected to the gas outlet 11 of the air pump assembly 2. After the detection is completed, the sample gas is discharged through the sample gas discharge channel 14, ensuring the continuity and accuracy of the measurement process.

[0060] In summary, the present invention realizes the accurate measurement of the particle concentration and other parameters in the sample gas through the coordinated work of multiple links such as sampling, measurement, multi-parameter detection, cleaning protection, heating and sealing. It has the advantages of high precision, strong environmental adaptability, multi-parameter measurement capability and simple installation and maintenance.

[0061] The above description is only a preferred embodiment of the present invention, and does not limit the scope of the present invention. All equivalent structural changes made by using the contents of the present invention specification and drawings under the inventive concept of the present invention, or directly / indirectly applied in other related technical fields are included in the protection scope of the present invention.

Claims

1. An extractable particle measuring instrument, characterized in that: include: Measuring cavity, sampling probe assembly, detection probe assembly, air pump assembly, annular light scattering optical path assembly, annular light scattering adjustment mechanism; The sampling probe assembly, the detection probe assembly, and the air pump assembly are detachably mounted on the upper end of the measuring cavity, a measuring chamber is provided at the lower end of the measuring cavity, and the sampling probe assembly and the air pump assembly are in communication with the measuring chamber; The annular light scattering optical path assembly includes a transmitting unit and a receiving unit, which are respectively arranged on both sides of the measuring chamber, and the light emitted by the transmitting unit is received by the receiving unit after passing through the measuring chamber; The annular light scattering adjustment mechanism is arranged between the transmitting unit and the receiving unit during adjustment, and is used to calibrate the annular light scattering optical path component; The sampling probe assembly is used to collect sample gas and inject it into the measuring chamber, the detection probe assembly is used to detect temperature, pressure, and flow rate, the air pump assembly is used to provide extraction power for the sampling probe assembly, the annular light scattering optical path assembly is used to detect the concentration of particulate matter in the measuring chamber, and the annular light scattering adjustment mechanism is used to calibrate the annular light scattering optical path assembly.

2. The extractable particle measuring instrument according to claim 1, characterized in that: The lower end of the measuring chamber is also provided with a cover.

3. The extractable particle measuring instrument according to claim 1, characterized in that: The detection probe assembly includes a back pressure tube and a full pressure tube; The opening of the full-pressure pipe faces the side from which the fluid comes, and the opening of the back-pressure pipe faces away from the side from which the fluid comes.

4. The extractable particle measuring instrument according to claim 1, characterized in that: The sampling probe assembly includes a sample gas extraction pipeline and a first heating tube; The sample gas extraction pipeline is connected to the measuring chamber, and a curved nozzle is also arranged at the front end of the sample gas extraction pipeline, and the curved nozzle faces the side of the fluid; The first heating tube is arranged on the side of the sample gas extraction pipeline and is used to heat the extracted sample gas.

5. The extractable particle measuring instrument according to claim 4, characterized in that: The air pump assembly is also provided with a first channel, an air outlet, a negative pressure port, and a compressed air inlet; The air outlet and the negative pressure port are respectively arranged at the front end and the rear end of the first channel, and the compressed air inlet is arranged on the side wall of the first channel between the air outlet and the negative pressure port; The compressed air inlet is connected to an external compressed air source, and the compressed air enters the first channel from the compressed air inlet and is discharged from the air outlet to generate negative pressure at the negative pressure port; The negative pressure port is connected to the measuring chamber, and the measuring chamber is connected to the sample gas extraction pipeline of the sampling probe assembly, and the sample gas is extracted into the measuring chamber under the action of negative pressure; The measuring cavity is provided with a sample gas discharge channel, and the gas outlet is connected to the sample gas discharge channel for discharging the sample gas after detection.

6. The extractable particle measuring instrument according to claim 1, characterized in that: The transmitting unit comprises: a light source, a collimating lens, and an aconic lens; The receiving unit comprises: a receiving lens and a light detector; The light source is used to emit light, and the light passes through the collimating lens and the aconic lens in sequence to form an annular measuring area in the measuring chamber; A sample gas is introduced into the measuring chamber through a sampling probe assembly, and the sample gas contains smoke particles; The scattered light generated by the smoke particles in the annular measurement area reaches the light detector after passing through the receiving lens and is used to evaluate the concentration of particulate matter.

7. The extractable particle measuring instrument according to claim 6, characterized in that: The annular light scattering adjustment mechanism includes a light adjustment component; The dimming component is arranged between the transmitting unit and the receiving unit, and is used to adjust the light intensity by changing the light blocking area, so as to achieve the purpose of simulating a specific amount of scattered signal, realize the pickup of the range signal and further realize the calibration function.

8. The extractable particle measuring instrument according to claim 6, characterized in that: The measuring cavity is also provided with a light gas curtain emitting channel and a light gas curtain receiving channel; The emitting light gas curtain channel and the receiving light gas curtain channel are respectively located at the front side of the conical lens and the front side of the receiving lens, and are used to pass protective gas into the front side of the conical lens and the receiving lens to form a gas curtain for isolation protection.

9. The extractable particle measuring instrument according to claim 1, characterized in that: A second heating tube is arranged in the measuring cavity for heating the entire heating cavity.

10. The extractable particle measuring instrument according to claim 1, characterized in that: The detection probe assembly is also provided with a temperature sensor; The detection probe assembly and the sampling probe assembly are installed in the measurement cavity at a rotatable angle, and the installation angle is adjusted by rotation; A fluororubber sealing ring is provided between the detection probe assembly and the sampling probe assembly and the measuring cavity for sealing.

Images