An environmental engineering air pollution detection device

Abstract

The invention discloses an environmental engineering atmospheric pollution detection device, belonging to the technical field of atmospheric pollution detection. The invention comprises a light source and a gas pool whose end can admit light; the gas pool comprises a gas pool body and a shell sleeved on the outside of the gas pool body; the gas pool body is provided with an acoustic resonance cavity, a window is installed at the end of the acoustic resonance cavity, and a sound-sensitive element in contact with the inner surface of the acoustic resonance cavity is installed in the gas pool body; the gas pool body is also provided with an air inlet channel and an air outlet channel connected to the acoustic resonance cavity; a filter is installed at the air inlet end of the air inlet channel; the air outlet end of the air outlet channel is connected to an air pump; an ultrasonic oscillator is fixedly connected to the outside of the gas pool body; in a working state, the ultrasonic oscillator works to vibrate the gas pool body, so that dust in the acoustic resonance cavity is separated from the acoustic resonance cavity and sucked to the outside by the air pump. The invention can self-clean the gas pool body through the ultrasonic oscillator, thereby achieving the purpose of improving detection efficiency and accuracy and ensuring the accuracy of detection results.

Description

Technical Field

[0001] The invention relates to the technical field of air pollution detection, and in particular to an air pollution detection device for environmental engineering. Background Art

[0002] Environmental change, pollution and its impact on ecology have become important issues of global concern. With the rapid development of my country's economy, the tasks of protecting the environment, strengthening environmental supervision and achieving sustainable development are very arduous;

[0003] At present, my country has established an environmental monitoring network system that adapts to my country's national conditions. Corresponding laws and standards have been formulated, the intensity of environmental law enforcement and supervision has been continuously improved, and measurement technology and testing equipment have been continuously improved. However, the distribution density of high-precision equipment is too low, which seriously restricts the scientific demonstration of environmental monitoring for air pollution control. Moreover, the current high-precision equipment has different functions and conditions of use, so there are problems of low detection efficiency and slow response in the detection process.

[0004] In the prior art, Chinese patent CN103954560B discloses a spatial beam coupling device for photoacoustic multi-component gas detection, which includes: a composite light source, a window, a gas pool, and an acoustic sensor. The device excites the gas in the gas pool by modulating the output light beam in the composite light source, so that the gas in the gas pool undergoes non-radiative transition after being stimulated to generate a photothermal signal. The photothermal signal is measured by an acoustic sensor, and the signal of the acoustic sensor is analyzed and processed to convert it into the concentration of the measured gas.

[0005] The coupling device has the advantages of small size, fast response, low background noise, and simultaneous detection of multiple components. It is suitable for the photoacoustic spectroscopy monitoring system of environmental gases, and can also be used for multi-light source coupling and detection of related equipment in the fields of spectral analysis and analytical instruments. However, the gas pool of the coupling device cannot be self-cleaning, and there are still problems of low detection efficiency and slow response during the detection process.

[0006] Therefore, based on the above problems, it is necessary to provide an environmental engineering air pollution detection device with high detection efficiency, high precision and accurate detection results. Summary of the invention

[0007] The purpose of the present invention is to overcome the defects of the prior art and provide an environmental engineering air pollution detection device.

[0008] In order to achieve the above object, the present invention provides the following technical solutions:

[0009] The environmental engineering air pollution detection device disclosed in the present invention comprises:

[0010] light source;

[0011] A gas pool with light entering the end;

[0012] The gas pool comprises a gas pool body and a shell sleeved outside the gas pool body;

[0013] The gas pool body is provided with an acoustic resonance cavity, a window is installed at the end of the acoustic resonance cavity, and a sound sensitive element in contact with the inner surface of the acoustic resonance cavity is installed in the gas pool body;

[0014] The gas pool body is also provided with an air inlet channel and an air outlet channel connected to the acoustic resonance cavity;

[0015] A filter is installed at the air inlet end of the air inlet passage;

[0016] The air outlet end of the air outlet channel is connected to the air pump;

[0017] An ultrasonic oscillator is fixedly connected to the outside of the gas pool body;

[0018] In the working state, the ultrasonic oscillator works to vibrate the gas pool body, so that the dust in the acoustic resonance cavity is peeled off from the acoustic resonance cavity and is sucked to the outside by the air pump.

[0019] Furthermore, the gas pool body has a single-end low beam, and a plurality of reflectors are arranged on the optical path of the light source.

[0020] Furthermore, the gas pool body is gap-matched with the side wall of the shell inner cavity, and a vibration isolation pad is fixedly connected to the bottom wall of the shell inner cavity, and contacts with the ultrasonic oscillator through the vibration isolation pad.

[0021] Furthermore, the top wall of the shell is provided with mounting holes corresponding to the positions of the air inlet channel and the air outlet channel, and the mounting holes are provided with vibration isolation sleeves, which are in contact with the pipelines of the air inlet channel and the air outlet channel through the vibration isolation sleeves.

[0022] Furthermore, the air inlet channel and the air outlet channel are both installed with elastic diaphragms at the ends of the acoustic resonance cavity, and the elastic diaphragms are provided with a plurality of micropores, and the micropores are in a sealed state in a free state without external force.

[0023] Furthermore, the gas cell body is a multi-reflection extraction sample cell.

[0024] Furthermore, the air inlet end of the air inlet channel of the gas pool body is fixedly connected with a sampling head and the filter in sequence, and the air enters the air inlet channel through the sampling head and the filter in sequence.

[0025] Furthermore, the angle between the window and the acoustic resonance cavity is 5° to 8°.

[0026] Furthermore, flexible sections are installed on the pipelines of the air inlet channel and the air outlet channel away from the acoustic resonance cavity, and the air pump and the filter are transitionally connected through the flexible sections.

[0027] In the above technical solution, the environmental engineering air pollution detection device provided by the present invention has the following beneficial effects:

[0028] 1. The gas pool body designed by the present invention has an ultrasonic oscillator installed between its bottom and the shell. When the gas pool body needs to be self-cleaned, the air pump and the ultrasonic oscillator are started, and the ultrasonic oscillator vibrates the gas pool body to separate the dust in the acoustic resonance cavity from the acoustic resonance cavity. The air pump draws air, and the air is discharged through the air inlet channel, the acoustic resonance cavity, and the air outlet channel. The gas pool body can be cleaned in time to ensure that the acoustic resonance cavity of the gas pool body is clean, which is conducive to ensuring the detection efficiency, improving the detection accuracy, and ensuring the accuracy of the detection results. In addition, when the air enters from the air inlet end of the air inlet channel, it passes through the filter, and the filter is filtered to ensure that the clean air enters the air inlet channel, which is conducive to improving the cleaning efficiency;

[0029] 2. The gas pool body designed by the present invention is matched with the side wall of the inner cavity of the shell through a gap. The shell contacts the ultrasonic oscillator through a vibration isolation pad. The mounting hole of the top wall of the shell is equipped with a vibration isolation sleeve, which contacts the pipelines of the air inlet channel and the air outlet channel through the vibration isolation sleeve. The vibration energy can be effectively prevented from being transmitted to the outside of the shell through the vibration isolation pad and the vibration isolation sleeve in this structure;

[0030] 3. The gas pool body designed in the present invention is a multi-reflection extraction sample pool. The air inlet end of the air inlet channel of the gas pool body is fixedly connected with a sampling head and a filter in sequence. The air enters the air inlet channel through the sampling head and the filter in sequence, so that the sample sampling channel and the self-cleaning channel of the detection device share a channel, making the entire gas pool compact in structure, saving space and being compact in size. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings required for use in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in the present invention. For ordinary technicians in this field, other drawings can also be obtained based on these drawings.

[0032] Figure 1 It is a schematic diagram of the overall structure of the environmental engineering air pollution detection device disclosed in the present invention;

[0033] Figure 2 It is a schematic diagram of the light source structure of the environmental engineering air pollution detection device disclosed in the present invention;

[0034] Figure 3It is a schematic diagram of the overall structure of another embodiment of the environmental engineering air pollution detection device disclosed in the present invention;

[0035] Figure 4 It is a schematic diagram of the overall structure of another embodiment of the environmental engineering air pollution detection device disclosed in the present invention.

[0036] Description of reference numerals:

[0037] Light source 1; collimated light source 11, reflecting prism 12, reflecting prism 13, reflecting prism 14, reflecting prism 15, reflecting prism 16, reflecting prism 17; window 2; gas pool body 3; shell 31; seismic isolation pad 32; air inlet channel 33; air outlet channel 34; vibration isolation sleeve 35; elastic diaphragm 36; flexible section 37; acoustic sensitive element 4; ultrasonic oscillator 5; filter 6; air pump 7; sampling head 8; detector 9. DETAILED DESCRIPTION

[0038] In order to enable those skilled in the art to better understand the technical solution of the present invention, the present invention will be further described in detail below with reference to the accompanying drawings.

[0039] See also Figure 1 As shown;

[0040] The invention of the environmental engineering air pollution detection device comprises:

[0041] Light source 1, a gas pool with light entering the end;

[0042] The gas pool includes a gas pool body 3 and a shell 31 sleeved outside the gas pool body 3;

[0043] The gas pool body 3 is provided with an acoustic resonance cavity, a window sheet 2 is installed at the end of the acoustic resonance cavity, and an acoustic sensitive element 4 in contact with the inner surface of the acoustic resonance cavity is installed in the gas pool body 3;

[0044] The gas pool body 3 is also provided with an air inlet channel 33 and an air outlet channel 34 connected to the acoustic resonance cavity;

[0045] A filter 6 is installed at the air inlet end of the air inlet passage 33;

[0046] The outlet end of the air outlet channel 34 is connected to the air pump 7;

[0047] An ultrasonic oscillator 5 is fixedly connected to the outside of the gas pool body 3;

[0048] In the working state, the ultrasonic oscillator 5 works to vibrate the gas pool body 3, so that the dust in the acoustic resonance cavity is separated from the acoustic resonance cavity and sucked out by the air pump 7, so as to achieve the purpose of self-cleaning of the gas pool body 3, thereby improving the detection efficiency and accuracy, and ensuring the accuracy of the detection results;

[0049] For details, see Figure 1 As shown, the gas pool includes a shell 31 and a gas pool body 3, the gas pool body 3 is installed in the shell 31, both ends of the gas pool body 3 can enter light, the shell 31 has light holes at corresponding positions, the gas pool body 3 can use both ends to enter light at the same time, or use a single end to enter light, the gas pool body 3 has an acoustic resonance cavity, the acoustic resonance cavity is cylindrical, both ends of the acoustic resonance cavity are installed with windows 2, and the acoustic sensitive element 4 is installed in the gas pool and contacts the inner surface of the acoustic resonance cavity;

[0050] The light beam output by the light source 1 is incident into the gas pool body 3 through the window 2 at a certain angle along the axis of the acoustic resonance cavity. The gas in the gas pool body 3 generates a photothermal signal without radiation transition after being excited by the incident light beam. The acoustic sensor 4 measures the generated photothermal signal, and then analyzes and processes the photothermal signal measured by the acoustic sensor 4 to obtain the concentration of the measured gas. The acoustic sensor 4 uses a low-frequency microphone, which has a flat response and maximum output in the range of 20-1000Hz. Preferably, the angle between the window 2 and the acoustic resonance cavity is 5° to 8°, so as to avoid the surface reflected light of the window 2 returning along the original path and generating optical standard noise.

[0051] like Figure 2 As shown, preferably, the gas pool body 3 has a single-end low beam, and a plurality of reflectors are arranged on the optical path of the light source 11 .

[0052] Specifically, the light source 11 is composed of a collimated light source 11, a reflecting prism 12, a reflecting prism 13, a reflecting prism 14, a reflecting prism 15, a reflecting prism 16, and a reflecting prism 17;

[0053] The collimated light source 11 is reflected by the reflection prism 12, the reflection prism 13, the reflection prism 14, the reflection prism 15, the reflection prism 16, and the reflection prism 17, and then enters the gas pool body 3 through the first window 22 or the second window 25, and is finally received by the detector 9;

[0054] See also Figure 1 As shown;

[0055] The gas pool includes a gas pool body 3 shell 31;

[0056] The shell 31 is sleeved on the outside of the gas pool body 3, and an ultrasonic oscillator 5 is installed between the bottom end of the gas pool body 3 and the shell 31. An air inlet channel 33 and an air outlet channel 34 connected to the acoustic resonance cavity are opened on the upper part of the gas pool body 3. The air inlet end of the air inlet channel 33 is connected to a filter 6 through a pipeline, and the air outlet end of the air outlet channel 34 is connected to an air pump 7 through a pipeline. When the gas pool body 3 is self-cleaning, the air pump 7 and the ultrasonic oscillator 5 are started, and the ultrasonic oscillator 5 vibrates the gas pool body 3 to separate the dust in the acoustic resonance cavity from the acoustic resonance cavity. The air pump 7 draws air, and the air is discharged through the air inlet channel 33, the acoustic resonance cavity, and the air outlet channel 34. In addition, when the air enters from the air inlet end of the air inlet channel 33, it passes through the filter 6, and the filter 6 is filtered to ensure that the clean air enters the air inlet channel 33, which is conducive to improving the cleaning efficiency.

[0057] See also Figure 1 As shown;

[0058] The gas pool body 3 is fitted with the side wall of the inner cavity of the shell 31, and the bottom wall of the inner cavity of the shell 31 is fixedly connected with a vibration isolation pad 32, which contacts with the ultrasonic oscillator 5 through the vibration isolation pad 32 to absorb vibration energy and prevent the vibration energy from being transmitted to the outside of the shell 31. When working, the ultrasonic oscillator 5 vibrates and transmits the vibration energy to the gas pool body 3;

[0059] See also Figure 1 As shown;

[0060] The top wall of the shell 31 is provided with mounting holes corresponding to the positions of the air inlet channel 33 and the air outlet channel 34, and the mounting holes are provided with vibration isolation sleeves 35, which are in contact with the pipelines of the air inlet channel 33 and the air outlet channel 34 to prevent the transmission of vibration energy between the pipelines and the shell 31;

[0061] See also Figure 1 As shown;

[0062] The air inlet channel 33 and the air outlet channel 34 are both installed with an elastic diaphragm 36 at the end of the acoustic resonance cavity. The elastic diaphragm 36 has a plurality of micropores. In a free state without external force, the micropores are in a closed state. When working, the air pump 7 pumps air, and as the gas pressure in the air inlet channel 33 and the air outlet channel 34 increases, the elastic diaphragm 36 begins to deform, and the micropores open to allow air to pass through.

[0063] See also Figure 3 As shown;

[0064] The gas cell body 3 is a multi-reflection extraction sample cell.

[0065] The air inlet end of the air inlet channel 33 of the gas pool body 3 is fixedly connected with the sampling head 8 and the filter 6 in sequence, and the air enters the air inlet channel 33 through the sampling head 8 and the filter 6 in sequence, so that the sample sampling channel and the self-cleaning channel of the detection device share a channel, making the entire gas pool compact in structure, saving space and having a small size.

[0066] See also Figure 4 As shown;

[0067] Flexible sections 37 are installed on the pipelines of the air inlet channel 33 and the air outlet channel 34 away from the end of the acoustic resonance cavity. The air pump 7 and the filter 6 are transitionally connected through the flexible section 37 to prevent vibration energy from being transmitted to the air pump 7 and the filter 6 through the pipeline, which is beneficial to reducing the failure rate of the air pump 7 and the filter 6.

[0068] In the above technical solution, the environmental engineering air pollution detection device provided by the present invention has the following beneficial effects:

[0069] 1. The gas pool body designed by the present invention has an ultrasonic oscillator installed between its bottom and the shell. When the gas pool body needs to be self-cleaned, the air pump and the ultrasonic oscillator are started, and the ultrasonic oscillator vibrates the gas pool body to separate the dust in the acoustic resonance cavity from the acoustic resonance cavity. The air pump draws air, and the air is discharged through the air inlet channel, the acoustic resonance cavity, and the air outlet channel. The gas pool body can be cleaned in time to ensure that the acoustic resonance cavity of the gas pool body is clean, and the purpose of self-cleaning is achieved, which is conducive to ensuring the detection efficiency, improving the detection accuracy, and ensuring the accuracy of the detection results. In addition, when the air enters from the air inlet end of the air inlet channel, it passes through the filter, and the filter is filtered to ensure that the clean air enters the air inlet channel, which is conducive to improving the cleaning efficiency;

[0070] 2. The gas pool body designed by the present invention is matched with the side wall of the inner cavity of the shell through a gap. The shell contacts the ultrasonic oscillator through a vibration isolation pad. The mounting hole of the top wall of the shell is equipped with a vibration isolation sleeve, which contacts the pipelines of the air inlet channel and the air outlet channel through the vibration isolation sleeve. The vibration energy can be effectively prevented from being transmitted to the outside of the shell through the vibration isolation pad and the vibration isolation sleeve in this structure;

[0071] 3. The gas pool body designed in the present invention is a multi-reflection extraction sample pool. The air inlet end of the air inlet channel of the gas pool body is fixedly connected with a sampling head and a filter in sequence. The air enters the air inlet channel through the sampling head and the filter in sequence, so that the sample sampling channel and the self-cleaning channel of the detection device share a channel, making the entire gas pool compact in structure, saving space and being compact in size.

[0072] The above description is only by way of illustration of certain exemplary embodiments of the present invention. It is undoubted that those skilled in the art can modify the described embodiments in various ways without departing from the spirit and scope of the present invention. Therefore, the above drawings and descriptions are illustrative in nature and should not be construed as limiting the scope of protection of the claims of the present invention.

Claims

1. Environmental engineering air pollution detection device, characterized in that: include: Light source (1); A gas pool with light entering the end; The gas pool comprises a gas pool body (3) and a shell (31) sleeved on the outside of the gas pool body (3); The gas pool body (3) is provided with an acoustic resonance cavity, a window sheet (2) is installed at the end of the acoustic resonance cavity, and an acoustic sensitive element (4) in contact with the inner surface of the acoustic resonance cavity is installed in the gas pool body (3); The gas pool body (3) is also provided with an air inlet channel (33) and an air outlet channel (34) which are connected to the acoustic resonance cavity; A filter (6) is installed at the air inlet end of the air inlet passage (33); The outlet end of the air outlet channel (34) is in communication with the air pump (7); An ultrasonic oscillator (5) is fixedly connected to the outside of the gas pool body (3); In the working state, the ultrasonic oscillator (5) works to vibrate the gas pool body (3), so that the dust in the acoustic resonance cavity is peeled off from the acoustic resonance cavity and is sucked to the outside by the air pump (7).

2. The environmental engineering air pollution detection device according to claim 1 is characterized in that ； The gas pool body (3) has a single-end low beam, and a plurality of reflectors are arranged on the optical path of the light source (1).

3. The environmental engineering air pollution detection device according to claim 1 is characterized in that ； The gas pool body (3) is gap-matched with the inner cavity side wall of the shell (31); a vibration isolation pad (32) is fixedly connected to the inner cavity bottom wall of the shell (31), and is in contact with the ultrasonic oscillator (5) via the vibration isolation pad (32).

4. The environmental engineering air pollution detection device according to claim 1, characterized in that; The top wall of the shell (31) is provided with mounting holes at positions corresponding to the air inlet channel (33) and the air outlet channel (34), and the mounting holes are provided with vibration isolation sleeves (35) which are in contact with the pipelines of the air inlet channel (33) and the air outlet channel (34) through the vibration isolation sleeves (35).

5. The environmental engineering air pollution detection device according to claim 1, characterized in that; The air inlet channel (33) and the air outlet channel (34) are both installed with elastic diaphragms (36) at the ends of the acoustic resonance cavity. The elastic diaphragm (36) is provided with a plurality of micropores. In a free state without external force, the micropores are in a sealed state.

6. The environmental engineering air pollution detection device according to any one of claims 1 to 5, characterized in that ； The gas pool body (3) is a multi-reflection extraction sample pool.

7. The environmental engineering air pollution detection device according to claim 6 is characterized in that ； The air inlet end of the air inlet channel (33) of the gas pool body (3) is fixedly connected with a sampling head (8) and the filter (6) in sequence, and air passes through the sampling head (8) and the filter (6) in sequence and enters the air inlet channel (33).

8. The environmental engineering air pollution detection device according to any one of claims 1 to 5, characterized in that ； The included angle between the window sheet (2) and the acoustic resonance cavity is 5° to 8°.

9. The environmental engineering air pollution detection device according to any one of claims 1 to 5, characterized in that; Flexible sections (37) are installed on the pipelines of the air inlet channel (33) and the air outlet channel (34) away from the acoustic resonance cavity, and the air pump (7) and the filter (6) are transitionally connected via the flexible sections (37).

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