Line pipe type air measuring device

Abstract

The utility model discloses a line pipe type air measuring device which comprises a shielding case, a signal collecting plate arranged in the middle of the interior of the shielding case, insulating fixing supports arranged at the two ends of the signal collecting plate and an electric field generating plate arranged on the insulating fixing supports, and an americium 241 radiator is arranged on one side of the electric field generating plate; one end of the shielding cover is provided with an air inlet end, the other end of the shielding cover is provided with an air outlet end, the air outlet end and the air inlet end are both of funnel-shaped structures, and the air inlet end, the shielding cover and the air outlet end are of split structures. According to the spool type air measuring device adopting the structure, the requirements of rapid, stable and continuous monitoring are met, the operation is simple, long-time measurement can be carried out, and the management cost is effectively reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of atmosphere measurement, in particular to a wire-tube type air measurement device. Background Art

[0002] Dust refers to solid particles suspended in the air and is one of the main factors maintaining global temperature. However, in our daily lives and work, industrial dust is a natural threat to human health and a major cause of various diseases. Inhaling dust can seriously harm workers' health, leading to pneumoconiosis. Excessive dust concentrations can also pose explosion risks. Consequently, dust hazards cause a significant number of casualties each year, resulting in significant economic losses for both the country and its employees. Therefore, equipping workplaces with online monitoring sensors to timely and effectively measure dust concentrations, accurately monitor dust levels, and implement effective dust removal and reduction plays a vital role in ensuring personal safety and improving environmental quality.

[0003] In the process of dust detection, many dust concentration detection systems based on different principles have been developed. These systems each have their own advantages. In terms of dust concentration measurement principles, scholars at home and abroad have continuously researched and innovated, resulting in a variety of dust concentration measurement and detection methods. Dust and air belong to the category of gas-solid two-phase flow, and the particles are relatively small, so detection is not easy. It is necessary to seek more effective detection methods from the fields of physics, electronics, chemistry, etc. to improve the domestic dust concentration detection level. In order to obtain the dust concentration of the entire confined space, there must be a systematic measurement solution that can accurately obtain the dust concentration distribution trend in the entire measurement space. This has an important decision-making role in the treatment and control of dust and improving the efficiency of industrial production. At present, the common measurement methods at home and abroad are as follows:

[0004] (1) Filter membrane weighing method: The weighing method is the most common, most extensive and most classic method currently used. The basic process is to use an air pump to extract workplace air through a sampling system, use a dried and weighed filter membrane to collect the dust in the air, and then dry and weigh it. The mass difference before and after sampling is used to calculate the mass of the collected dust. The advantage of the weighing method is that it can measure the mass concentration of dust, and the chemical composition, dispersion degree and shape of dust particles have no effect on the measurement readings. It can also measure dust with higher concentrations, and the measurement technology is relatively simple. The disadvantage is that the measurement process is long and complicated, easily interfered with, and cannot be measured continuously in real time.

[0005] (2) Photoelectric detection method: Photoelectric detection method is divided into light absorption measurement method and light scattering measurement method. Light absorption measurement method is based on the light absorption phenomenon and Lambert-Beer principle, and an absorption optical dust meter is developed. This method is also called opacity method. Light scattering measurement method is based on the light scattering phenomenon and scattering theory, and a scattering optical dust meter is designed. The opacity method is designed based on the light-shielding property of particulate matter. The specific working process is that the incident light generated by the laser is irradiated to the spectrometer, and the spectrometer divides the incident light into two beams of equal intensity. One beam is used as a signal beam to illuminate the measurement area and then enter the photodetector. The other beam is used as a reference beam and directly enters the photodetector. Due to the absorption and scattering of particulate matter, the intensity of the former light is weakened. The light scattering method uses a solid-state light source to emit a near-infrared light or a parallel laser beam modulated by a pulse modulator to irradiate the measured gas. The particulate matter in the flue gas scatters the light in all directions. The scattered light is focused on the detector for detection, and the amplifier amplifies the output voltage or current signal. Within a certain range, the signal is proportional to the concentration of particulate matter. According to the angle between the receiver and the light source, it can be divided into forward scattering, side scattering and back scattering. Dust detectors using this method generally have high sensitivity. The principles of the opacity method and light scattering method show that while both can achieve online continuous measurement, their accuracy is affected by factors such as particle size, distribution, particle concentration, moisture content, and the color of the measured gas.

[0006] (3) Acoustic method: The measurement principle of the acoustic method is to place a detection sound source and a receiver in the dust test area. When the detection sound source vibrates and penetrates the dust test area, it is blocked by solid particles, resulting in a loss of sound energy. At this time, the sound energy loss value of the sound source has a corresponding functional relationship with the dust particle concentration. The acoustic method uses the sound energy loss value to measure the dust concentration. During the measurement process, changes in the airflow velocity and pressure of the measurement channel, the humidity and temperature of the channel, and the dispersion composition of the dust particles will affect the accuracy of the measurement results. Therefore, the accuracy is relatively low.

[0007] (4) Optical method: The optical method is to use the transmittance of the light source in the optical principle to measure the dust concentration in the area to be measured. After the conversion between the photoelectric signals, it is connected to the computer to calculate the concentration value of the measured dust particles. This measurement method can achieve long-distance real-time online measurement, has a wide range of applications, and is simple to operate. The most widely used industrial dust measurement instruments in various industries are developed based on the optical method principle. The optical method has the advantages of high measurement accuracy and reliable results. Compared with the transmission dust concentration meter, the scattered optical dust meter is more accurate in measuring low-concentration dust particles.

[0008] (5) Piezoelectric vibration method: The piezoelectric vibration method generally uses two identical piezoelectric crystals (quartz crystal resonators) in the dust measurement process. One crystal is used for reference and comparison, and the other is placed in the sampling chamber as a measuring device. The measurement principle of the piezoelectric vibration method is to place a filter belt in the sampling chamber located in the area to be measured. The function of the filter belt is that when the dust to be measured passes through the filter belt, it will be adsorbed on the filter belt, causing its own mass to change. When the mass of the filter belt changes, it will cause the vibration frequency of the piezoelectric crystal in the sampling chamber to change. The change in the vibration frequency of the piezoelectric crystal can be measured to measure the mass of the sampled dust particles, and thus the mass concentration of the dust particles can be measured. The piezoelectric vibration method requires the removal of dust particles deposited on the piezoelectric crystal during the measurement process. The operation is complicated and the degree of automation is low. Therefore, it is not suitable for real-time online and long-term dust concentration detection.

[0009] (5) Radiation absorption method: The measurement principle of the radiation absorption method is that when a ray with radiation characteristics passes through the dust distribution area to be measured, the radiation ray is attenuated due to being blocked and obstructed by dust particles. By measuring the degree of change in the attenuation of the ray during the whole process, the concentration value of the dust particles can be measured. The measurement dynamic range of the radiation absorption method is very wide, and it can be measured in most spectral ranges. It has the advantages of high measurement accuracy and high sensitivity. When using the radiation absorption method to measure dust concentration, the result is obtained by the degree of attenuation change of the ray after being blocked by dust particles, so radioactive isotopes become the most commonly used radiation source. The β-ray law is a radiation absorption method measurement based on the interaction of β-rays of a certain energy in the ionization chamber with the atoms or nuclei in the material when passing through the material, causing energy attenuation. The energy attenuation is proportional to the mass of the material. The mass of the material is calculated by the energy attenuation of the β-rays, and the concentration of the particulate matter is calculated by the mass of the material and the volume of the ionization chamber. The beta-ray dust measurement method can automatically and continuously monitor the total dust mass concentration or respirable dust concentration in workplace air. It offers unparalleled advantages over other methods: it directly measures dust mass concentration, unaffected by factors such as dust type, particle size, dispersion, shape, color, and gloss. Its results are equivalent to those of the classic standard method—the gravimetric method—reducing sample handling time and the risk of contamination. It is free of human error and error accumulation, requiring no frequent calibration or zeroing, and enables automatic and continuous monitoring. The beta-ray dust measurement method is a unique and important measurement technique for dust measurement. Due to its innovative and forward-looking nature, Hebei Province is the only province to have issued a local standard for the determination of particulate matter in exhaust gases from stationary sources, "DB 13 / T 2376-2016 Beta-ray Method for the Determination of Particulate Matter in Exhaust Gases from Stationary Pollution Sources." The use of beta sensors for online dust monitoring in the occupational health field remains largely unexplored. Utility Model Content

[0010] The purpose of the utility model is to provide a wire-tube type air measuring device, which realizes the requirements of rapid and stable continuous monitoring, is easy to operate, can perform long-term measurement, and effectively reduces management costs.

[0011] To achieve the above-mentioned object, the utility model provides a wire-tube type air measuring device, comprising a shielding cover, a signal collecting plate arranged in the middle of the shielding cover, insulating fixing brackets arranged at both ends of the signal collecting plate, and an electric field generating plate arranged on the insulating fixing bracket, wherein an americium 241 radiator is arranged on one side of the electric field generating plate;

[0012] An air inlet is provided at one end of the shielding cover, and an air outlet is provided at the other end of the shielding cover. The air outlet and the air inlet are both configured as funnel-shaped structures, and the air inlet, the shielding cover and the air outlet are configured as split structures.

[0013] Preferably, the electric field generating plate is configured as a cylindrical structure, and both ends are fixed by the insulating fixing bracket.

[0014] Preferably, the americium 241 radiator is arranged between the air inlet end and the insulating fixing bracket and is arranged in a ring structure.

[0015] Preferably, the outer diameter of the electric field generating plate is smaller than the inner diameter of the shielding cover.

[0016] Preferably, the outer diameters of the connection ends of the air inlet end and the air outlet end with the shielding cover are the same as the outer diameter of the shielding cover.

[0017] Preferably, the insulating fixing bracket and the signal collecting plate form an I-shaped structure.

[0018] Therefore, the utility model adopts a wire-tube air measuring device with the above structure, which realizes the requirements of fast, stable and continuous monitoring, is easy to operate, and can perform long-term measurement, effectively reducing management costs.

[0019] The technical solution of the present invention is further described in detail below through the accompanying drawings and embodiments. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 This is a structural schematic diagram of an embodiment of a wire-tube air measuring device of the present utility model. DETAILED DESCRIPTION

[0021] The technical solution of the present utility model is further described below through the accompanying drawings and embodiments.

[0022] Unless otherwise defined, the technical or scientific terms used in this utility model shall have the usual meanings understood by persons of ordinary skill in the field to which this utility model belongs. The words "first", "second" and similar terms used in this utility model do not indicate any order, quantity or importance, but are only used to distinguish different components. Words such as "include" or "comprise" mean that the elements or objects appearing before the word include the elements or objects listed after the word and their equivalents, without excluding other elements or objects. Words such as "connect" or "connected" are not limited to physical or mechanical connections, but may include electrical connections, whether direct or indirect. "Up", "down", "left", "right" and the like are only used to indicate relative positional relationships. When the absolute position of the object being described changes, the relative positional relationship may also change accordingly.

[0023] Example

[0024] Figure 1 This is a schematic structural diagram of an embodiment of a wire-tube air measuring device of the present invention. As shown in the figure, the present invention provides a wire-tube air measuring device, comprising a shielding cover 1, a signal collecting plate 2 arranged in the middle position inside the shielding cover 1, insulating fixing brackets 3 arranged at both ends of the signal collecting plate 2, and an electric field generating plate 4 arranged on the insulating fixing bracket 3. The electric field generating plate 4 is configured as a cylindrical structure, and both ends are fixed by insulating fixing brackets 3. An americium 241 radiator 5 is provided on one side of the electric field generating plate 4; an air inlet 6 is provided at one end of the shielding cover 1, and an air outlet 7 is provided at the other end of the shielding cover 1. Both the air outlet 7 and the air inlet 6 are configured as funnel-shaped structures, and the air inlet 6, the shielding cover 1, and the air outlet 7 are configured as a split structure. This structure can perform continuous and real-time measurement of dust.

[0025] The americium 241 radiator 5 is disposed between the air inlet 6 and the insulating bracket 3 and is arranged in a ring-shaped structure. The outer diameter of the electric field generating plate 4 is smaller than the inner diameter of the shielding cover 1. The outer diameters of the air inlet 6 and the air outlet 7 connecting to the shielding cover 1 are the same as the outer diameter of the shielding cover 1.

[0026] The insulating fixing bracket 3 and the signal collecting plate 2 form an I-shaped structure.

[0027] Therefore, the utility model adopts a wire-tube air measuring device with the above structure, which realizes the requirements of fast, stable and continuous monitoring, is easy to operate, and can perform long-term measurement, effectively reducing management costs.

[0028] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the present invention rather than to limit it. Although the present invention has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that they can still modify or replace the technical solution of the present invention with equivalents, and these modifications or equivalent replacements cannot cause the modified technical solution to deviate from the spirit and scope of the technical solution of the present invention.

Claims

1. A wire tube type air measuring device, characterized in that: It includes a shielding cover, a signal collecting plate arranged in the middle of the shielding cover, insulating fixing brackets arranged at both ends of the signal collecting plate, and an electric field generating plate arranged on the insulating fixing bracket, wherein an americium 241 radiator is arranged on one side of the electric field generating plate; An air inlet is provided at one end of the shielding cover, and an air outlet is provided at the other end of the shielding cover. The air outlet and the air inlet are both configured as funnel-shaped structures, and the air inlet, the shielding cover and the air outlet are configured as split structures.

2. The wire-tube type air measuring device according to claim 1, characterized in that: The electric field generating plate is configured as a cylindrical structure, and both ends are fixed by the insulating fixing bracket.

3. The wire-tube type air measuring device according to claim 2, characterized in that: The americium 241 radiator is arranged between the air inlet end and the insulating fixing bracket and is arranged in a ring structure.

4. The wire-tube type air measuring device according to claim 3, characterized in that: The outer diameter of the electric field generating plate is smaller than the inner diameter of the shielding cover.

5. The wire-tube type air measuring device according to claim 4, characterized in that: The outer diameters of the connection ends of the air inlet end and the air outlet end with the shielding cover are all the same as the outer diameter of the shielding cover.

6. The wire-tube type air measuring device according to claim 5, characterized in that: The insulating fixing bracket and the signal collecting plate form an I-shaped structure.

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