CN221528340U - Particulate matter monitoring device - Google Patents

Abstract

A particulate matter monitoring device includes a host portion and a particulate matter detection module housed in the host portion, and the host portion is connectable to a first heater arranged to heat a gas sample before the gas sample enters the particulate matter detection module. The particulate matter detection module includes a body portion that forms or receives a flow channel through which a gas sample flows; and a particulate matter detection device that detects particulate matters of the gas sample passing through the flow passage; the particle detection module further comprises a second heater, the second heater is located in the host machine part and arranged on the body part of the particle detection module so as to heat at least one part of the body part of the particle detection module, the second heater is a patch type resistance heater, and the body part is made of metal. The monitoring device can more accurately control the temperature and the humidity of the detected gas sample, and obtain accurate monitoring data.

Description

Particulate matter monitoring device

Technical Field

The utility model relates to the technical field of air quality detection equipment, in particular to particulate matter monitoring equipment for detecting particulate matters in a detection gas sample.

Background

In order to detect the concentration of particulate matter in ambient air, various types of particulate matter monitoring devices have been marketed which continuously detect the concentration of particulate matter in the air by one or more monitoring means. Particulate monitoring devices typically introduce ambient air in a selected area as a gas sample through an ambient air sampling port, the gas sample is introduced through a conduit into a host portion of the monitoring device where it is detected by a detection device.

The existing monitoring equipment can continuously and directly monitor the mass concentration of the particles, and a detection device generally included in the monitoring equipment adopts means such as light scattering turbidity measurement, beta radiation attenuation measurement, inertial mass measurement and the like. The particulate monitoring device may include one or more of these measurement means.

In existing particulate monitoring devices, the gas sample may flow through an external heating tube connected to the host portion of the detection device before the gas sample reaches the host portion, reducing the relative humidity of the gas sample while the gas sample is being transported. Other drying means are sometimes employed to remove moisture from the sample stream. The detection accuracy of the particulate matter monitoring device can be improved by reducing the humidity in the gas sample.

However, in some monitoring applications, there may be situations where the external heating tube is insufficient to ensure accuracy of particulate matter detection. In some cases, the temperature of the gas sample fluctuates due to insufficient external heating pipes to control the temperature and humidity of the gas sample within the preferred ranges, or when the gas sample heated by the external heating pipes flows further into the main body part, resulting in humidity changes, which can adversely affect the accuracy of particulate matter detection.

In addition, in the process that the heated gas sample enters the main machine part to be detected, moisture may be condensed in the main machine part and even on some parts of the detection device due to the temperature difference between the gas sample and the ambient gas in the main machine part, so that the detection accuracy is reduced.

Therefore, it is desirable to improve the existing particulate matter monitoring device, further avoid the influence of unsuitable temperature and humidity on the detection device and the detection process, and improve the detection accuracy of the particulate matter monitoring device.

Disclosure of utility model

In order to enable the temperature and humidity of the gas sample to be subjected to particulate matter detection to be kept within preferred ranges, avoid the influence of condensed water in the main body portion, and improve the accuracy of particulate matter detection, the present disclosure provides a particulate matter monitoring device including a main body portion and a particulate matter detection module accommodated in the main body portion, and the main body portion can be connected to a first heater arranged to heat the gas sample before the gas sample enters the particulate matter detection module. The particulate matter detection module includes a body portion that forms or receives a flow channel through which a gas sample flows; and a particulate matter detection device that performs particulate matter detection on the gas sample passing through the flow passage; the particle detection module further comprises a second heater which is positioned in the host part and arranged on the body part of the particle detection module so as to heat at least one part of the body part of the particle detection module, wherein the second heater is a patch type resistance heater, and the body part is made of metal.

According to yet another aspect of the utility model, the host portion includes a housing, and the particulate monitoring device further includes one or more third heaters secured to an inside of the housing of the host portion.

According to yet another aspect of the utility model, the heating setting temperature of the second heater is 2-25 ℃ higher than the ambient temperature at the gas sample inlet.

According to still another aspect of the present utility model, the particulate matter detecting device is a light scattering photometer including a lens disposed within the body portion.

Preferably, the second heater is provided on an outer surface of a portion of the body portion adjacent the lens.

According to still another aspect of the present utility model, the particulate matter detecting device is a radiation attenuation detecting device mounted on the body portion, and the second heater is mounted on or near a portion of the body portion forming the flow passage.

According to yet another aspect of the utility model, the particulate matter detection module includes a first particulate matter detection module and a second particulate matter detection module, each of the first particulate matter detection module and the second particulate matter detection module having a second heater disposed on a respective body portion, one of the first particulate matter detection module and the second particulate matter detection module including a light scattering photometer and the other including a radiation attenuation detection device.

According to yet another aspect of the present utility model, the first particulate matter detection module is disposed upstream of the second particulate matter detection module in the flow path of the gas sample, the heating set temperature of the second heater of the first particulate matter detection module is 2-25 ℃ higher than the ambient temperature at the gas sample inlet, and the heating set temperature of the second heater of the second particulate matter detection module is 2-40 ℃ higher than the ambient temperature at the gas sample inlet.

According to a further aspect of the utility model, the first heater is a heating tube arranged outside the main body part for introducing gas into the main body part, wherein the heating tube has a set temperature below 100 ℃.

According to a further aspect of the utility model, the second heater is a power adjustable heater the first heater is provided with a first sensor for measuring the temperature and humidity of the gas sample heated by the first heater, and the particulate matter detection module is provided with a second sensor for measuring the temperature and humidity of the gas sample flowing through the flow channel; the power of the second heater is adjusted according to the temperature or humidity measured by at least one of the first sensor and the second sensor to control the humidity of the gas sample in the flow channel to be in the range of 35% -65%.

According to the particulate matter monitoring equipment, at least one stage of built-in heater is added in addition to the existing external heating pipe in the existing equipment, and the body part of the detection module positioned in the main machine part is directly heated, so that the temperature and the humidity of a detected sample can be controlled more accurately, and accurate monitoring data can be obtained.

In addition, the heater provided on the body portion of the detection module can reduce the problem of moisture condensation of the detection module, and is particularly advantageous for optical devices such as lenses.

In addition, a primary heater is added on the shell of the main machine part of the particle monitoring equipment, so that the temperature of the shell of the main machine part is ensured to be closer to that of the internal detection module, and moisture condensation in the main machine part is reduced or avoided.

Drawings

For a more complete understanding of the present utility model, reference is made to the following description of exemplary embodiments taken in conjunction with the accompanying drawings, in which:

FIG. 1 illustrates a schematic diagram of a particulate monitoring device according to a preferred embodiment of the present utility model;

FIG. 2 is a schematic plan view of a host portion of a particulate monitoring device according to a preferred embodiment of the present utility model;

FIG. 3 shows a schematic view of a first heater connected to a host portion according to a preferred embodiment of the present utility model;

FIG. 4 is a schematic cross-sectional view of a first particulate matter detection module of a particulate matter monitoring device according to a preferred embodiment of the present utility model, the first particulate matter detection module employing a light scattering photometer as a detection means;

Fig. 5 is a schematic plan view showing a second particulate matter detection module arranged in a host portion according to a preferred embodiment of the present utility model, the second particulate matter detection module employing a radiation attenuation detection device as a detection device.

List of reference numerals:

1 particulate matter monitoring equipment;

2, a gas inlet;

21 an external temperature humidity sensor;

3 a first heater;

31. heating pipes;

32 a first sensor;

A 5-host unit;

51 a housing;

52 a third heater;

6 a first particulate matter detection module;

61 a first module body portion;

a first module heater 62;

a first module sensor 63;

65 lenses;

66. A flow channel;

A second particulate matter detection module;

71 a second module body portion;

a second module heater 72;

73. A second module sensor;

8. a flow control valve;

9. and a vacuum pump.

Detailed Description

The present utility model will be further described with reference to specific embodiments and drawings, in which more details are set forth in the following description in order to provide a thorough understanding of the present utility model, but it will be apparent that the present utility model can be embodied in many other forms than described herein, and that those skilled in the art may make similar generalizations and deductions depending on the actual application without departing from the spirit of the present utility model, and therefore should not be construed to limit the scope of the present utility model in terms of the content of this specific embodiment.

Fig. 1 shows a schematic diagram of a particulate matter monitoring device 1 according to a preferred embodiment of the present invention, which is commonly used for detecting properties (e.g. mass, concentration, size) of particulate matter in ambient air. Ambient air is sampled at the selected area and a sample of gas is taken into the apparatus, typically through gas inlet 2, to obtain particulate matter detection data of the ambient air at the selected area.

As shown in fig. 1, the particulate matter monitoring device 1 includes a gas inlet 2, a first heater 3, a main body portion 5 (see fig. 2) including a particulate matter detection module, a flow control valve 8, and a vacuum pump 9. Under the suction action of the vacuum pump 9, the gas sample enters the particulate matter monitoring device 1 through the gas inlet 2, flows through the first heater 3, is heated by the first heater 3 to raise the temperature and lower the humidity of the gas sample, and then enters the host part 5 (see fig. 2) to be detected by the particulate matter detection modules (the first particulate matter detection module 6 and the second particulate matter detection module 7) therein, thereby obtaining particulate matter detection data.

The flow control valve 8 is used to control the flow rate of the sample fluid to be measured entering the host part 5, and may be integrated in the host part 5, or may be attached to the vacuum pump 9 or installed in a pipeline.

Further, the particulate matter detection module located in the host portion 5 further includes a body portion (i.e., the first module body portion 61 shown in fig. 4 and the second module body portion 71 shown in fig. 5) forming or receiving a flow channel through which the gas sample flows, and a particulate matter detection device configured to perform particulate matter detection on the gas sample flowing through the flow channel.

In particular, according to the present utility model, the particulate matter detection module further includes a second heater, i.e., either the first module heater 62 or the second module heater 72. The second heater is located in the main body portion 5 and is provided on the body portion of the particulate matter detection module to heat at least a portion of the body portion of the detection module. The body portion is formed of a thermally conductive material, typically metal. The second heater is preferably a chip resistance heater which is attached to the body portion in surface contact and heats at least a portion of the body portion. The heat generated by the second heater will be conducted through the body portion to the flowing gas sample within the body portion or to a portion of the particulate matter detection device held by the body portion.

Preferably, the heating set temperature of the second heater is 2-25 ℃ higher than the ambient temperature in which the gas sample is located. By providing the second heater in each module, the temperature and humidity of the gas sample entering the particulate matter detection module can be controlled within a preferred range for particulate matter detection, especially the relative humidity of the gas sample being detected can be controlled within a range of 35% -65%, more preferably within a range of 45% -55%, and most preferably within about 50%, thereby ensuring the accuracy of the particulate matter detection result.

Further, as shown in fig. 1 and 2, the main body 5 includes two particulate matter detection modules: a first particulate matter detection module 6 and a second particulate matter detection module 7, which are arranged in series in the main body part 5, and the gas sample flows through the first particulate matter detection module 6 and then through the second particulate matter detection module 7. As can be understood from fig. 1, 4 and 5, the first particulate matter detection module 6 and the second particulate matter detection module 7 have a first module body portion 61, a second module body portion 71, and second heaters, i.e., a first module heater 62 and a second module heater 72, mounted on the first module body portion 61, the second module body portion 71, respectively. The first and second module heaters 62 and 72 raise the temperature of at least a portion of the respective first and second module body portions 61 and 71.

In a preferred embodiment, the heating set temperature of the first module heater 62 of the first particulate matter detection module 6 located upstream is 2-25 ℃ higher than the ambient temperature at which the gas sample is taken, and the heating set temperature of the second module heater 72 of the second particulate matter detection module 7 located downstream is 2-40 ℃ higher than the ambient temperature at which the gas sample is taken.

Preferably, the particulate matter detection module comprises a light scattering photometer or a radiation attenuation detection device as the particulate matter detection device in the module. Preferably, the upstream first particulate matter detection module 6 comprises a light scattering photometer, while the downstream second particulate matter detection module 7 comprises a radiation attenuation detection device.

Fig. 4 shows a cross-sectional view of a first particulate matter detection module 6 comprising a light scattering photometer, which module is mounted within a housing 51 of the main body part 5 as shown in fig. 2. The light scattering photometer mainly includes an optical device and an electronic device that provide an incident light beam and detect irradiance of light scattered by particles, and measures the concentration of the particulate matter of the gas sample in real time by irradiating the particulate matter of the gas sample and detecting light scattered from the particulate matter.

As shown in fig. 4, a flow channel 66 through which a gas sample flows is formed inside the first module body part 61, and various optical and electronic components of the light scattering photometer are mounted on the body part, wherein two lenses are respectively provided at two positions of the first module body part 61, and a light beam enters or exits the flow channel 66 through the lenses.

As shown in fig. 4, the first particulate matter detection module 6 including the light scattering photometer is provided with two first module heaters 62 respectively provided on the outer surface of a portion of the body portion near the lens 65. This placement of the first module heater 62 helps to transfer heat to the lens 65, raise the temperature of the lens 65, avoid condensation of moisture on the lens 65, and at the same time, the heat of the first module heater 62 will also be transferred to the gas sample in the flow channel 66 through the first module body portion 61 of thermally conductive material to maintain or raise the temperature of the gas sample to control the relative humidity of the gas sample in a preferred range.

Additionally, one or more first module heaters 62 may be added and mounted directly on the outer surface of the wall of the first module body portion 61 forming the flow channel 66 to directly heat the gas sample in the flow channel 66.

Fig. 5 shows a schematic view of a second particulate matter detection module 7 comprising a radiation attenuation detection device within the host part. The radiation attenuation detection device typically comprises a Beta particle radiation source (e.g. carbon-14 or krypton-85) and a Beta particle detector (e.g. geiger-mueller detector, plastic scintillator, proportional counter or ionization chamber), with a filter placed between the Beta particle radiation source and the Beta particle detector. The filter collects particulate matter present in the ambient air over time. As the amount of particulate matter collected by the filter increases, the particulate matter attenuates the Beta particles emanating from the radiation source (i.e., the Beta particle detector senses less radiation from the Beta source), which is detected by the detector, and the resulting Beta radiation signal can be indicative of the particle mass concentration of the particulate matter in the air sample.

As shown in fig. 5, the second module body portion 71 of the second particulate matter detection module 7 including the radiation attenuation detection device forms or receives a flow channel through which the gas sample flows, wherein a second module heater 72 is provided on a portion of the second module body portion 71 adjacent to the flow channel to directly heat the gas sample in the flow channel, thereby ensuring that the temperature and relative humidity of the gas sample remain within preferred ranges.

Further, as shown in fig. 5, the housing 51 is also provided with third heaters 52, which are installed at intervals. Preferably, the third heater 52 is a chip resistor heater, and is mounted on the inner surface of the housing 51 and can be separated from the second module body 71 of the second particulate matter detection module 7 by a distance, so as to heat the housing 51 and the ambient air inside the housing 51, further ensure the stability of the device temperature, improve the measurement accuracy, and avoid condensation.

In the preferred embodiment, the third heater 52 may be provided in plural, such as two, three, four, etc., installed at intervals inside the housing 51 to uniformly maintain the overall temperature of the main body part 5.

Returning to fig. 1, the particulate monitoring device 1 according to the present utility model comprises a plurality of sensors.

An external temperature and humidity sensor 21 for measuring the temperature and humidity of the measured environment is provided on the near side of the gas inlet 2.

The first heater 3 provided outside the main body 5 is a heating pipe 31 as shown in fig. 3, which has a hollow cavity through which the gas sample flows, and a temperature and humidity sensor (first sensor 32) for measuring the real-time temperature and humidity of the gas sample heated by the first heater 3 is provided at the bottom of the first heater 3. The heating temperature of the first heater 3 is typically lower than 100 ℃. The heating tube 31 further has electrical and signal connection lines for supplying power to the heating tube 31 and for transmitting data measured by the sensor 32 to the host part 5.

In the first particulate matter detection module 6 is provided a second sensor (first module sensor 63) for measuring the temperature and humidity, preferably the first module sensor 63 is provided in the flow channel 66 as shown in fig. 4 for measuring the real-time temperature and humidity of the gas sample detected in the flow channel 66. The second particulate matter detection module 7 is also provided with a second sensor (second module sensor 73) for measuring temperature and humidity. Preferably, the second module sensor 73 is also arranged in the flow channel of the second particulate matter detection module 7 for measuring the real-time temperature and humidity of the gas sample detected therein.

In the preferred embodiment, the external temperature and humidity sensor 21, the first sensor 32, the first module sensor 63 and the second module sensor 73 transmit measured data to the controller of the monitoring device, the first module heater 62 and the second module heater 72 are heaters with adjustable heating power, and the heating power of the first module heater 62 and the second module heater 72 is adjusted in real time according to the data measured by the sensors so as to maintain the humidity of the air flow sample in the flow channel of each module between 35% and 65%.

In addition, for the detection module provided with a plurality of second heaters, the second heaters may be partially started to heat and partially stopped to heat, and the temperature and humidity of the air flow sample may be controlled by controlling the number of the second heaters.

In addition, the third heater 52 provided on the inner surface of the housing 51 of the main body part 5 may be a heater with an adjustable heating power, so that the controller controls the heating power of the third heater 52 to be adjusted in real time according to the data measured by the respective sensors, thereby maintaining the overall temperature of the main body part and reducing the condensation phenomenon.

According to the particulate matter monitoring device 1 of the present utility model, in addition to the existing external heating pipe 31 in the existing monitoring device, at least one stage of heater directly acting on the body portion of the module is added, so as to directly heat the body portion of the particulate matter detection module located in the host portion 5, thereby being capable of controlling the temperature and humidity of the detected gas sample more accurately, and obtaining accurate monitoring data.

In addition, the first module heater 62 provided on the first module body portion 61 of the detection module can reduce the problem of moisture condensation on the detection device, and is particularly advantageous for optical devices such as lenses.

In addition, a first-stage heater is additionally arranged on the shell 51 of the main machine part 5 of the particle monitoring device 1, so that the temperature of the shell 51 of the main machine part 5 is ensured to be closer to that of the internal detection module, and the problem of moisture condensation in the main machine part 5 is reduced or avoided.

While the utility model has been described in terms of preferred embodiments, it is not intended to be limiting, but rather to the utility model, as will occur to those skilled in the art, without departing from the spirit and scope of the utility model. Therefore, any modification, equivalent variation and modification of the above embodiments according to the technical substance of the present utility model fall within the protection scope defined by the claims of the present utility model.

Claims (10)

1. A particulate matter monitoring device comprising a main body part (5) and a particulate matter detection module accommodated in the main body part (5), and the main body part (5) being connectable to a first heater (3), the first heater (3) being arranged to heat a gas sample before the gas sample enters the particulate matter detection module,

The particulate matter detection module includes:

a body portion forming or receiving a flow channel through which a gas sample flows; and

A particulate matter detection device for detecting particulate matter of a gas sample passing through the flow channel;

The method is characterized in that;

The particulate matter detection module further includes a second heater located within the main body portion (5) and disposed on the body portion of the particulate matter detection module to heat at least a portion of the body portion of the particulate matter detection module,

The second heater is a chip resistance heater, and the body portion is made of metal.

2. The particulate monitoring device of claim 1, wherein the host portion (5) includes a housing (51),

The particulate matter monitoring device further comprises one or more third heaters (52), the third heaters (52) being mounted to the inside of the housing (51) of the main body part (5).

3. The particulate monitoring device of claim 1, wherein the second heater has a heating set temperature that is 2-25 ℃ higher than an ambient temperature at which the gas sample is sampled.

4. The particulate monitoring apparatus of claim 1, wherein the particulate detection device is a light scattering photometer including a lens (65) disposed within the body portion, the second heater being disposed on an outer surface of a portion of the body portion proximate the lens (65).

5. The particulate monitoring device of claim 1, wherein the second heater is mounted on or near an outer surface of a portion of the body portion that forms a flow channel.

6. The particulate matter monitoring device of claim 1 or 5, wherein the particulate matter detection means is radiation attenuation detection means, the radiation attenuation detection means being mounted in the body portion.

7. The particulate matter monitoring device of claim 1, wherein the particulate matter detection module includes a first particulate matter detection module (6) and a second particulate matter detection module (7), the first particulate matter detection module (6) and the second particulate matter detection module (7) each having the second heater provided on the respective body portion,

One of the first particle detection module (6) and the second particle detection module (7) comprises a light scattering photometer and the other comprises a radiation attenuation detection device.

8. The particulate matter monitoring device of claim 7, wherein the first particulate matter detection module (6) is disposed upstream of the second particulate matter detection module (7) on the flow path of the gas sample, the heating set temperature of the second heater of the first particulate matter detection module (6) is 2-25 ℃ higher than the ambient temperature at the gas sample sampling site, and the heating set temperature of the second heater of the second particulate matter detection module (7) is 2-40 ℃ higher than the ambient temperature at the gas sample sampling site.

9. The particulate monitoring device of claim 1, wherein the second heater is a heating power adjustable heater,

The first heater (3) is provided with a first sensor (32) for measuring the temperature and humidity of the gas sample heated by the first heater (3), and the particulate matter detection module is provided with a second sensor for measuring the temperature and humidity of the gas sample flowing through the flow channel;

The heating power of the second heater is adjusted according to the temperature or humidity measured by at least one of the first sensor (32) and the second sensor to control the relative humidity of the gas sample in the flow channel to be in the range of 35% -65%.

10. The particulate monitoring device of claim 1,

The first heater (3) is a heating tube (31), the heating tube (31) is arranged outside the main machine part (5) and is used for introducing gas into the main machine part (5), and the set temperature of the heating tube (31) is lower than 100 ℃.