Explosion-proof dust particle counter

Abstract

The explosion-proof dust particle counter comprises a positive pressure explosion-proof shell and an intelligent protective gas circuit, the positive pressure explosion-proof shell is provided with a detection gas inlet / outlet and a protective gas inlet / outlet, and a light source, a first lens group, a measuring cavity, a second lens group, a light detector, an explosion-proof electric control module and a man-machine interaction unit are integrated in the positive pressure explosion-proof shell; the intelligent protection gas circuit comprises a pressure regulating filter, an electromagnetic throttle valve, a pressure sensor and a flow sensor, and a positive pressure environment in the positive pressure explosion-proof shell can be maintained; light emitted by the light source is focused on the measuring cavity through the first lens group, gas to be detected enters the measuring cavity, particles scatter incident light to form light pulse signals, the light pulse signals are transmitted to the light detector through the second lens group and converted into electric pulse signals, and target signals are screened out and fed back to the man-machine interaction unit to be displayed after the electric pulse signals are amplified and screened through the explosion-proof electric control module. According to the invention, multiple anti-explosion protection design is adopted, and the device has the advantages of high anti-explosion grade, accurate detection and convenient installation and maintenance.

Description

Technical Field

[0001] This invention relates to the field of clean environment monitoring equipment technology, and in particular to an explosion-proof dust particle counter. Background Technology

[0002] Particle counters are crucial instruments for measuring particle concentration and size distribution in clean environments. However, ordinary products lack explosion-proof design, making them unsuitable for use in environments with explosive gases / dusts, such as petrochemical and pharmaceutical intermediate production facilities. Existing explosion-proof particle counters suffer from the following drawbacks: their explosion-proof rating is mostly limited to Class IIB, making them unsuitable for high-risk Class IIC environments and potentially causing safety accidents; some explosion-proof particle counters use single positive pressure protection, which interferes with the detection gas path, leading to decreased detection accuracy and failing to meet cleanliness monitoring standards in fields such as pharmaceuticals and electronics; their installation methods are limited, making them inconvenient for complex site layouts and increasing on-site construction costs; and their data transmission capabilities are weak, preventing integration with automated monitoring systems and hindering remote real-time monitoring.

[0003] Therefore, how to provide an explosion-proof dust particle counter that balances explosion-proof performance and detection accuracy is a technical problem that urgently needs to be solved by those skilled in the art. Summary of the Invention

[0004] This invention provides an explosion-proof dust particle counter to solve the above-mentioned technical problems.

[0005] To address the aforementioned technical problems, this invention provides an explosion-proof dust particle counter, comprising a positive pressure explosion-proof housing and an intelligent protective gas path that cooperates with the positive pressure explosion-proof housing. The positive pressure explosion-proof housing is a sealed structure and has a detection gas inlet, a detection gas outlet, a protective gas inlet, and a protective gas outlet. The positive pressure explosion-proof enclosure is equipped with a light source, a first lens group, a measuring cavity, a second lens group, a photodetector, an explosion-proof electrical control module, and a human-machine interaction unit. The intelligent protective gas circuit includes a pressure regulating filter, an electromagnetic throttle valve, a pressure sensor, and a flow sensor, which are used to introduce protective gas into the positive pressure explosion-proof enclosure to maintain an internal positive pressure environment. The light emitted by the light source is focused into the measurement cavity by the first lens group. The gas to be detected enters the measurement cavity through the gas inlet. When the particles in the gas pass through the measurement cavity quickly, they scatter the incident light, forming a light pulse signal. The light pulse signal is transmitted to the photodetector through the second lens group. The photodetector converts the light pulse signal into an electrical pulse signal in proportion. The electrical pulse signal is amplified and identified by the electronic circuit of the explosion-proof electrical control module. The target signal is then selected according to the signal threshold corresponding to the particle size and fed back to the human-machine interaction unit for display.

[0006] Preferably, the positive pressure explosion-proof shell is made of 2mm thick 304 stainless steel through sealing and welding, and the weld joint is polished.

[0007] Preferably, the intelligent protective gas path further includes an integrated exhaust assembly, which integrates an exhaust valve, a safety valve, and a spark particle baffle.

[0008] Preferably, the explosion-proof dust particle counter can be installed in two ways: integrated installation and separate installation. In integrated installation, the air intake component of the intelligent protective air circuit and the explosion-proof positive pressure controller are placed on the outside of the positive pressure explosion-proof housing on both sides. In separate installation, the explosion-proof positive pressure controller is installed inside or outside the positive pressure explosion-proof housing, and the integrated exhaust component is fixed inside the positive pressure explosion-proof housing.

[0009] Preferably, the pressure sensor and flow sensor of the intelligent protective gas circuit collect pressure and gas flow data inside the positive pressure explosion-proof enclosure in real time and feed them back to the explosion-proof electrical control module. When the pressure or flow exceeds the preset range, the explosion-proof electrical control module triggers an audible and visual alarm and simultaneously controls the electromagnetic throttle valve and exhaust valve to adjust in conjunction to maintain a stable positive pressure environment.

[0010] Preferably, the protective gas is argon or clean air, the gas source pressure range is 0.3~0.8MPa, the minimum flow rate of the protective gas is not less than 50L / min, and the shortest gas exchange time is not more than 15min.

[0011] Preferably, the light source is a laser diode, and the photodetector is a photoelectric conversion element.

[0012] Preferably, the signal threshold corresponding to the particle size is preset according to the detection requirements, covering the particle size range of 0.3μm, 0.5μm, 1.0μm, 3.0μm, 5.0μm, and 10.0μm.

[0013] Preferably, the human-computer interaction unit adopts a resistive touch screen that supports multilingual display.

[0014] Preferably, the positive pressure explosion-proof housing is further provided with an air quality sensor, which is connected in series between the detection gas inlet and the measuring chamber to pre-treat the gas to be detected entering the measuring chamber.

[0015] Compared with the prior art, the explosion-proof dust particle counter provided by the present invention has the following advantages: 1. This invention adopts a multi-layer explosion-proof protection design, with a protection level of IP66, which is suitable for hazardous locations of Class IIA, IIB, and IIC. It has a high explosion-proof level and strong safety and reliability. 2. This invention uses a laser diode light source and a high-precision sensor, which can detect particles of multiple sizes from 0.3μm to 10.0μm. The sampling flow rate is stable, and the concentration indication error, repeatability relative error and particle size distribution error are all controlled within a reasonable range, so the measurement data are accurate and reliable. 3. This invention supports both integrated and split installation methods to adapt to different site environments; the human-machine interaction unit supports multilingual display, has a user-friendly interface, and facilitates parameter setting, fault query, and historical data tracing. It can be widely used in drug testing institutes, blood centers, epidemic prevention stations, the electronics industry, pharmaceutical workshops, semiconductors, environmental protection and other production enterprises and research departments, and is especially suitable for cleanliness monitoring in hazardous places with explosive gases or dust. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the structure of an explosion-proof dust particle counter according to a specific embodiment of the present invention; Figure 2 This is a schematic diagram illustrating the working principle of an explosion-proof dust particle counter according to a specific embodiment of the present invention; Figure 3 This is a schematic diagram of the principle of the intelligent protective air circuit in a specific embodiment of the present invention.

[0017] In the diagram: 10-Positive pressure explosion-proof enclosure, 11-Detection gas inlet, 12-Detection gas exhaust port, 13-Protective gas inlet, 14-Protective gas exhaust port, 20-Intelligent protective gas circuit, 21-Stop valve, 22-Pressure regulating filter, 23-Electromagnetic throttle valve, 24-Pressure sensor, 25-Flow sensor, 26-Spark particle baffle, 30-Light source, 40-First lens group, 50-Measuring chamber, 60-Second lens group, 70-Photodetector. Detailed Implementation

[0018] To illustrate the technical solutions of the invention in more detail, specific embodiments are listed below to demonstrate the technical effects; it should be emphasized that these embodiments are used to illustrate the invention and not to limit the scope of the invention.

[0019] The explosion-proof dust particle counter provided by this invention, such as Figures 1 to 3 As shown, it includes a positive pressure explosion-proof housing 10 and an intelligent protective gas path 20 that cooperates with the positive pressure explosion-proof housing 10, wherein: The positive pressure explosion-proof housing 10 is a sealed structure, with a detection gas inlet 11, a detection gas outlet 12, a protective gas inlet 13, and a protective gas outlet 14.

[0020] The positive pressure explosion-proof housing 10 is equipped with a light source 30, a first lens group 40, a measuring cavity 50, a second lens group 60, a photodetector 70, an explosion-proof electrical control module (not shown), and a human-machine interaction unit (not shown). Specifically, the explosion-proof electrical control module can be fixed inside one side of the positive pressure explosion-proof housing 10 and is electrically connected to the pressure sensor 24, the flow sensor 25, the photodetector 70, and the human-machine interaction unit respectively. The human-machine interaction unit can be embedded in the surface of the positive pressure explosion-proof housing 10 and is flush with the external operating surface.

[0021] The intelligent protective gas circuit 20 includes a shut-off valve 21, a pressure regulating filter 22, an electromagnetic throttle valve 23, a pressure sensor 24, a flow sensor 25, and a spark particle baffle 26, which are used to introduce protective gas into the positive pressure explosion-proof housing 10 to maintain the internal positive pressure environment.

[0022] The light emitted by the light source 30 is focused into the measurement cavity 50 by the first lens group 40. The gas to be detected enters the measurement cavity 50 through the detection gas inlet 11. When the particles in the gas pass through the measurement cavity 50 quickly, they scatter the incident light, forming a light pulse signal. This light pulse signal is transmitted to the photodetector 70 through the second lens group 60. The photodetector 70 converts the light pulse signal into an electrical pulse signal in a proportional manner. The electrical pulse signal is amplified and identified by the electronic circuit of the explosion-proof electrical control module. The target signal is then selected according to the signal threshold corresponding to the particle size and fed back to the human-machine interaction unit for display.

[0023] This invention employs a multi-layered explosion-proof protection design, making it suitable for hazardous locations of Class IIA, IIB, and IIC, with a high explosion-proof rating and strong safety and reliability.

[0024] In some embodiments, the positive pressure explosion-proof housing 10 is made of 2mm thick 304 stainless steel through sealing welding. The weld is polished and free from defects such as false welding, incomplete welding, protrusions, and slag inclusions. The protection level reaches IP66, which can effectively isolate the intrusion of external explosive media.

[0025] In some embodiments, the intelligent protective gas path 20 further includes an integrated exhaust assembly, which integrates an exhaust valve, a safety valve, and a spark particle baffle 26, wherein the spark particle baffle 26 can block any sparks or particles that may be generated, further improving explosion-proof safety.

[0026] In some embodiments, the explosion-proof dust particle counter can be installed in two ways: integrated installation and split installation. In integrated installation, the air intake assembly (including the shut-off valve 21 and the pressure regulating filter 22) of the intelligent protective air circuit 20 and the explosion-proof positive pressure controller are placed on the outside of the positive pressure explosion-proof housing 10 on both sides. In split installation, the explosion-proof positive pressure controller is installed inside or outside the positive pressure explosion-proof housing 10, and the integrated exhaust assembly is fixed inside the positive pressure explosion-proof housing 10, adapting to different on-site installation requirements.

[0027] In some embodiments, the pressure sensor 24 and flow sensor 25 of the intelligent protective gas circuit 20 collect pressure and gas flow data inside the positive pressure explosion-proof enclosure 10 in real time and feed them back to the explosion-proof electrical control module. The working pressure inside the positive pressure explosion-proof enclosure 10 is maintained at 200~600Pa, the minimum positive pressure is not lower than 150Pa, and the maximum leakage flow does not exceed 15L / min. When the pressure or flow exceeds the preset range, the explosion-proof electrical control module triggers an audible and visual alarm and simultaneously controls the electromagnetic throttle valve 23 and the exhaust valve to adjust in conjunction to maintain a stable positive pressure environment.

[0028] In some embodiments, the protective gas may be argon or clean air, with a gas source pressure range of 0.3~0.8MPa, a minimum flow rate of the protective gas of not less than 50L / min, and a minimum air exchange time of not more than 15min, to ensure that the concentration of explosive medium inside the positive pressure explosion-proof enclosure 10 is lower than the safety threshold.

[0029] In some embodiments, the light source 30 is a laser diode, and the emitted light is focused by the first lens group 40 to form a precise detection beam; the photodetector 70 is a photoelectric conversion element, which can efficiently convert light pulse signals into electrical pulse signals to ensure detection sensitivity.

[0030] In some embodiments, the signal threshold corresponding to the particle size is preset according to the detection requirements, covering the particle size range of 0.3μm, 0.5μm, 1.0μm, 3.0μm, 5.0μm, and 10.0μm, to meet the high-precision detection requirements of multiple scenarios.

[0031] In some embodiments, the human-computer interaction unit may be a resistive touch screen that supports multilingual display (such as Chinese and English), has a user-friendly interface, and can easily realize parameter setting, fault query and historical data tracing functions.

[0032] In some embodiments, the positive pressure explosion-proof housing 10 is further provided with an air quality sensor, which is connected in series between the detection gas inlet 11 and the measurement chamber 50 to pre-process the gas to be detected entering the measurement chamber 50, filter out some interfering impurities, and improve the accuracy of the detection data.

[0033] In summary, the explosion-proof dust particle counter provided by this invention, through the coordinated design of the positive pressure explosion-proof shell 10 and the intelligent protective gas path 20, combined with a multi-layer explosion-proof protection structure, has a high explosion-proof rating and is suitable for hazardous locations of Class IIA, IIB, and IIC. At the same time, it integrates a high-precision optical detection module and a flexible interactive unit to achieve accurate counting of multiple particle sizes and convenient operation. It can be widely used in pharmaceutical testing institutes, blood centers, epidemic prevention stations, the electronics industry, pharmaceutical workshops, semiconductors, environmental protection and other production enterprises and research departments, and is especially suitable for cleanliness monitoring in hazardous locations with explosive gases or dust.

[0034] Obviously, those skilled in the art can make various modifications and variations to this invention without departing from its spirit and scope. Therefore, if these modifications and variations fall within the scope of the claims of this invention and their equivalents, this invention also intends to include these modifications and variations.

Claims

1. An explosion-proof dust particle counter, characterized in that, It includes a positive pressure explosion-proof enclosure and an intelligent protective gas circuit that cooperates with the positive pressure explosion-proof enclosure. The positive pressure explosion-proof enclosure is a sealed structure and has a detection gas inlet, a detection gas outlet, a protective gas inlet, and a protective gas outlet. The positive pressure explosion-proof enclosure is equipped with a light source, a first lens group, a measuring cavity, a second lens group, a photodetector, an explosion-proof electrical control module, and a human-machine interaction unit. The intelligent protective gas circuit includes a pressure regulating filter, an electromagnetic throttle valve, a pressure sensor, and a flow sensor, which are used to introduce protective gas into the positive pressure explosion-proof enclosure to maintain an internal positive pressure environment. The light emitted by the light source is focused into the measurement cavity by the first lens group. The gas to be detected enters the measurement cavity through the gas inlet. When the particles in the gas pass through the measurement cavity quickly, they scatter the incident light, forming a light pulse signal. The light pulse signal is transmitted to the photodetector through the second lens group. The photodetector converts the light pulse signal into an electrical pulse signal in proportion. The electrical pulse signal is amplified and identified by the electronic circuit of the explosion-proof electrical control module. The target signal is then selected according to the signal threshold corresponding to the particle size and fed back to the human-machine interaction unit for display.

2. The explosion-proof dust particle counter as described in claim 1, characterized in that, The positive pressure explosion-proof shell is made of 2mm thick 304 stainless steel through sealing and welding, and the weld joints are polished.

3. The explosion-proof dust particle counter as described in claim 1, characterized in that, The intelligent protective gas path also includes an integrated exhaust assembly, which integrates an exhaust valve, a safety valve, and a spark particle baffle.

4. The explosion-proof dust particle counter as described in claim 3, characterized in that, The explosion-proof dust particle counter can be installed in two ways: integrated installation and split installation. In integrated installation, the air intake component of the intelligent protective air circuit and the explosion-proof positive pressure controller are placed on the outside of the positive pressure explosion-proof housing on both sides. In split installation, the explosion-proof positive pressure controller is installed inside or outside the positive pressure explosion-proof housing, and the integrated exhaust component is fixed inside the positive pressure explosion-proof housing.

5. The explosion-proof dust particle counter as described in claim 1, characterized in that, The pressure sensor and flow sensor of the intelligent protective gas circuit collect pressure and gas flow data inside the positive pressure explosion-proof enclosure in real time and feed them back to the explosion-proof electrical control module. When the pressure or flow exceeds the preset range, the explosion-proof electrical control module triggers an audible and visual alarm and controls the electromagnetic throttle valve and exhaust valve to adjust in conjunction to maintain a stable positive pressure environment.

6. The explosion-proof dust particle counter as described in claim 1, characterized in that, The protective gas is argon or clean air, with a gas source pressure range of 0.3~0.8MPa, a minimum flow rate of not less than 50L / min, and a minimum gas exchange time of not more than 15min.

7. The explosion-proof dust particle counter as described in claim 1, characterized in that, The light source is a laser diode, and the photodetector is a photoelectric conversion element.

8. The explosion-proof dust particle counter as described in claim 1, characterized in that, The signal threshold corresponding to the particle size is preset according to the detection requirements, covering the particle size range of 0.3μm, 0.5μm, 1.0μm, 3.0μm, 5.0μm, and 10.0μm.

9. The explosion-proof dust particle counter as described in claim 1, characterized in that, The human-computer interaction unit uses a resistive touchscreen and supports multilingual display.

10. The explosion-proof dust particle counter as described in claim 1, characterized in that, An air quality sensor is also provided inside the positive pressure explosion-proof housing. The air quality sensor is connected in series between the detection gas inlet and the measurement chamber and is used to pre-process the gas to be detected entering the measurement chamber.

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