CN215493145U - Parallel detection device for particulate matter and gas discharged by diesel engine - Google Patents

Abstract

The utility model discloses a parallel detection device for particulate matters and gas discharged by a diesel engine, which comprises: the sampling module is provided with a particulate matter collecting channel and a gas collecting channel; the particle detection channel module comprises a particle detection channel and a particle detection module, wherein the input end of the particle detection channel is communicated with the output end of the particle collection channel; the gas detection channel module comprises a gas detection channel with an input end communicated with the output end of the gas collection channel, and gas detection modules sequentially arranged on the gas detection channel, and further comprises a power source arranged on the gas detection channel; the analysis control module is respectively in communication connection with the particulate matter detection module, the gas detection module and the power source; the parallel detection device can simultaneously detect the content of the particulate matters and the content of the gas and avoid the mutual interference between the detection of the content of the particulate matters and the detection of the content of the gas.

Description

Parallel detection device for particulate matter and gas discharged by diesel engine

Technical Field

The utility model relates to the technical field of diesel engine tail gas detection, in particular to a parallel detection device for particulate matters and gas discharged by a diesel engine.

Background

Harmful components in the emissions of diesel vehicles pose a great hazard to human health and the environment; at present, with the continuous increase of the yield and the holding capacity of diesel vehicles in China, the influence of particulate matters and nitrogen oxides generated by the tail gas of the diesel vehicles on the environment is increasingly large, the emission pollution of the diesel vehicles is more and more emphasized by the nation, and strict national standards are formulated.

The diesel engine tail gas detection equipment in the prior art can only detect one of particulate matters and gas contents, and simultaneously needs two sets of equipment to detect the particulate matters and the gas contents respectively, so that two persons are required to carry out back and forth operation, the detection mode and the operation flow are complex, the detection mode which is the same as a gas path and is used in the prior art and does not meet the current intelligentization detection requirement is not met, the automatic detection requirement is not used in the prior art, namely, sampling is carried out by adopting a sampling channel, the output end of the sampling tube is respectively connected to the particulate matter detection channel and the gas detection channel, and as the gas detection channel is provided with a power source, when the power source provides power, part of the particulate matters can be extracted by the power source, so that the measurement error of the particulate matters is caused; and in the prior art, one set of equipment can not detect the particulate matter and the gas content simultaneously, if the particulate matter and the gas content need to be detected simultaneously, two sets of equipment are needed to detect the particulate matter and the gas content respectively, two persons are needed to operate back and forth, the detection mode and the operation flow are complex, and the current intelligent and automatic detection requirements are not met, so that a method capable of solving the problems needs to be found.

SUMMERY OF THE UTILITY MODEL

In view of the above, there is a need to overcome at least one of the above-mentioned drawbacks in the prior art, and the present invention provides a parallel type detection device for detecting exhaust particulate matter and gas of a diesel engine, comprising: a sampling module having a particulate matter collection channel and a gas collection channel; the particle detection channel module comprises a particle detection channel of which the input end is communicated with the output end of the particle collection channel, and a particle detection module arranged on the particle detection channel; the gas detection channel module comprises a gas detection channel, a first filtering module and a gas detection module, wherein the input end of the gas detection channel is communicated with the output end of the gas collection channel, the first filtering module and the gas detection module are sequentially arranged on the gas detection channel, the first filtering module is used for filtering particles, and the gas detection channel module also comprises a power source arranged on the gas detection channel; and the analysis control module is in communication connection with the particulate matter detection module, the gas detection module and the power source respectively.

According to the prior art in the patent background art, the emissions of the diesel vehicle contain particulate matters and gas, the two components need to be detected by using different detection modules, most diesel engine tail gas detection equipment in the prior art can only detect one of particulate matters and gas content, and meanwhile, the detection needs two sets of equipment to respectively detect the particulate matters and the gas content, and two persons need to operate back and forth; the utility model discloses a parallel detection device for diesel engine exhaust particulate matter and gas, which collects diesel engine exhaust through a particulate matter collection channel and a gas collection channel in two paths, wherein one path is communicated with a particulate matter detection channel module, the particulate matter detection channel module is used for detecting the content of the particulate matter, the other path is communicated with a gas detection channel module, the gas detection channel module is used for detecting the content of the gas, if a sampling channel is adopted for sampling, then a sample is respectively transmitted to the particulate matter detection channel and the gas detection channel, and because a power source is arranged on the gas detection channel, when the power source provides power, part of the particulate matter can be extracted by the power source, so that the measurement error of the particulate matter is caused; therefore, the parallel detection device of present case can detect particulate matter content and gas content simultaneously and avoid particulate matter content detection and the mutual interference between the gas content detection, has simplified the operation mode moreover, can realize single detection, has reduced the cost of labor.

In addition, the parallel detection device for the particulate matters and the gas discharged by the diesel engine, disclosed by the utility model, has the following additional technical characteristics:

further, the power source is an air pump.

Further, the power source is arranged between the sampling module and the gas detection module, and at the moment, the power source provides negative pressure for the acquisition module.

Further, first filtration module, gaseous detection module and the power supply sets gradually gaseous detection passageway is last, the gas vent of power supply with particulate matter detection module's protection gas import intercommunication, at this moment, the power supply to gaseous detection module output negative pressure.

Further, the gas detection channel module further comprises a drying module, and the first filtering module, the drying module and the gas detection module are sequentially arranged on the gas detection channel.

The influence of water molecules on the detection result is great, and the detection error is reduced through the drying device.

Further, the particulate matter detection module comprises a detection cavity, and a sampling inlet and an outlet which are communicated with the output end of the particulate matter collection channel are formed in the side wall of the detection cavity; the collimating lens unit is positioned on the right side of the sampling inlet and is provided with a first lens and a second lens matched with the first lens; a light source disposed within the detection cavity, the light source being located at a right focus of the first lens; a focusing lens disposed within the detection cavity and positioned to the left of the sampling inlet; and the detector is arranged in the detection cavity and is positioned at the left focal point of the focusing lens.

The light source sets up the focus department at first lens, adjust the position of second lens and make second lens and first lens cooperate and reach approximate telecentric optical path for the light beam that the light source jetted out changes into approximate parallel light behind first lens and the second lens, detection error has been reduced, and owing to what obtain is approximate parallel light, therefore the optical path can be adjusted suitable length in order to avoid the optical path overlength light energy to lose gradually, length is short causes low concentration particulate matter detection error excessively, and simple structure, it is with low costs.

Furthermore, the first lens and the second lens are cooperatively arranged, that is, the second lens, the first lens and the light source form an approximately telecentric light path, so that light beams emitted by the light source pass through the first lens and the second lens and are converted into approximately parallel light, and an included angle between the approximately parallel light and a horizontal line is less than or equal to 5 degrees.

Furthermore, a left protective gas inlet and a right protective gas inlet are formed on the detection cavity and are respectively positioned between the sampling inlet and the focusing lens, and the right protective gas inlet is positioned between the sampling inlet and the collimating lens unit and is respectively communicated with a dry clean gas source; the detection cavity is provided with two outlets, and the two outlets are a left outlet and a right outlet which are respectively opposite to the left side shielding gas inlet and the right side shielding gas inlet.

In order to prevent an optical system from being polluted by smoke, a double-air curtain protection technology is adopted, a protection air inlet is arranged on the left side of a collimating lens unit, dry and clean air is injected from the protection air inlet to be protected against the collimating lens unit, further, a small amount of diesel engine tail air flows to the surface of the collimating lens unit due to the fact that the protection air flows in a detection cavity, an outlet is arranged at the position opposite to the protection air inlet, the outlet and the protection air inlet are matched to act, so that after the dry and clean air is injected from the protection air inlet, the protection air forms an even protection air curtain on the left side of the collimating lens unit, and similarly, an even protection air curtain is formed on the right side of a focusing lens, and therefore the first lens and the second lens can be well protected.

Further, first filtration module gaseous detection module and the power supply sets gradually on the gaseous detection passageway, the gas vent of power supply behind the second filtration module that is used for filtering particulate matter and gaseous pollutants composition with left side protection gas import with right side protection gas import connects respectively.

The direct power supply that adopts will not contain the gaseous left side protection gas import and the import of right side protection gas of injecting into of particulate matter, and need not set up the power supply in addition again, has simplified the structure, the cost is reduced.

Further, the light source is an LED lamp.

Further, the inner wall surface of the detection cavity is a surface subjected to rough treatment.

The inner wall of the detection chamber is roughened to prevent the detection light from being reflected on the inner wall, and the detection error is reduced.

Further, a heating sheet is arranged outside the detection cavity.

Further, the gas detection module is a non-dispersive infrared absorption method detection module or an ultraviolet differential absorption method detection module, such as a Laoshan model 3026 infrared comprehensive flue gas analyzer and a 3023 ultraviolet differential comprehensive flue gas analyzer.

The gas detection module in the prior art adopts an electrochemical method, the method is low in precision and large in interference, the current detection requirement cannot be met, and the scheme adopts a non-dispersive infrared absorption method or an ultraviolet differential absorption method, so that the gas detection module has higher precision.

Further, the collection module comprises a sampling tube body; a particulate matter collection channel and a gas collection channel formed in the sampling tube body side by side; the heat preservation pipe is sleeved on the outer peripheral surface of the sampling pipe body, and the front end of the sampling pipe body extends out of the heat preservation pipe; and a back pressure detection module fixedly arranged at the front end of the sampling pipe body.

Can detect diesel engine exhaust port backpressure in the sampling through backpressure detection module, improve detection accuracy.

Furthermore, the heat preservation pipe is sleeved outside the transmission line of the backpressure detection module and the collection pipeline body.

Further, the collection port of the gas collection channel is provided with a particulate filter.

Furthermore, the sampling pipe also comprises a gas collecting pipe and a particulate matter collecting pipe, a pipe hole of the gas collecting pipe forms the gas collecting channel, a pipe hole of the particulate matter collecting pipe forms the particulate matter collecting channel, and the sampling pipe body is sleeved outside the gas collecting pipe and the particulate matter collecting pipe.

Still further, the gas collection tube and the particulate collection tube are tubes made of polytetrafluoroethylene.

The pipe body made of polytetrafluoroethylene is used as a gas collecting pipe and a particulate matter collecting pipe, so that the particulate matter and gas can be better prevented from being adsorbed by the pipe wall.

Further, the sampling pipe body is a corrugated pipe.

The bellows can be crooked but difficult rupture, and protective gas collection pipe and particulate matter collection pipe that can be better, and guarantee to detect not influenced.

Further, the heat preservation pipe is a pipe made of heat preservation materials.

Furthermore, the heat insulation material is asbestos or glass fiber cotton.

Further, the cross-sectional area of the gas collection tube is less than the cross-sectional area of the particulate collection tube.

Further, the sampling tube body is fixedly installed at the front end of the sampling tube body through a fixing clamp.

Furthermore, the parallel detection device also comprises a human-computer interaction module in communication connection with the analysis control module.

The remote operation can be realized through a human-computer interaction module (terminal equipment, such as a mobile phone and the like), and the change of the detection data can be seen in real time.

According to another aspect of the utility model, a detection method based on the parallel detection device for the exhaust particulate matters and gases of the diesel engine is also provided, and the detection method comprises the following steps:

inserting a sampling end of the sampling module into an exhaust port of a diesel engine;

step two, stepping the throttle of the diesel engine to the maximum, and detecting through the parallel detection device, wherein the specific detection steps are as follows: the sampling module is divided into two paths to simultaneously acquire diesel engine emissions; one path of emission is conveyed to the particulate matter detection channel through the particulate matter collection pipeline, enters a particulate matter detection module for detection to obtain particulate matter detection information, and sends the particulate matter detection information to the analysis control module; the other path of emission is powered by the power source, is conveyed to the gas detection channel through the gas collection pipeline, passes through the first filtering module to filter particles, is dehumidified through the drying module, enters the gas detection module to be detected to obtain gas detection information and sends the detection information to the analysis control module;

repeating the steps for two times and three times, and analyzing the particulate matter detection information and the gas detection information received for three times by the analysis control module to obtain detection data; the analysis control module uploads the detection data to a human-computer interaction interface in a wired or wireless (wifi, Bluetooth) communication mode.

Additional aspects and advantages of the utility model will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of the utility model.

Drawings

The above and/or additional aspects and advantages of the present invention will become apparent and readily appreciated from the following description of the embodiments, taken in conjunction with the accompanying drawings of which:

FIG. 1 is a schematic block diagram of a parallel type detection device for detecting particulate matters and gases discharged by a diesel engine according to an embodiment of the utility model;

FIG. 2 is a schematic block diagram of a parallel type detection device for detecting particulate matters and gases discharged by a diesel engine according to another embodiment of the utility model;

FIG. 3 is an optical diagram of a particulate detection module in an embodiment provided by the present invention;

FIG. 4 is a schematic structural diagram of a sampling module according to an embodiment of the present invention; and

fig. 5 is a schematic diagram of the distribution of the NO concentration measured when the drying module is not provided and when the drying module is provided in one embodiment of the present invention.

Wherein, 1 is the sampling module, 101 is the sampling pipe body, 102 is particulate matter collection passageway, 103 is gaseous collection passageway, 104 is the insulating tube, 105 is the fixation clamp, 106 is backpressure detection module, 107 is the transmission line, 108 is particulate matter filter, 2 is particulate matter detection passageway, 3 is particulate matter detection module, 301 is the detection cavity, 302 is the sampling import, 303 is first lens, 304 is the second lens, 305 is focusing lens, 306 is the detector, 307 is the left side export, 308 is the right side export, 309 is the left side protection gas import, 310 is the right side protection gas import, 311 is the light source, 4 is gaseous detection passageway, 5 is first filter module, 6 is gaseous detection module, 7 is the power supply, 8 is the analysis and control module, 9 is drying module, 10 is human-computer interaction module.

Detailed Description

Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to the same or similar elements or elements having the same or similar function throughout; the embodiments described below with reference to the drawings are illustrative only and should not be construed as limiting the utility model.

In the description of the present invention, it is to be understood that the terms "upper", "lower", "bottom", "top", "front", "rear", "inner", "outer", "lateral", "vertical", and the like, indicate orientations and positional relationships based on the orientations and positional relationships shown in the drawings, are used only for convenience in describing the present invention and for simplification of description, and do not indicate or imply that the device or element being referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention.

The utility model provides a parallel detection device for diesel engine exhaust particulate matter and gas, which collects diesel engine exhaust through a particulate matter collection channel and a gas collection channel in two paths, wherein one path is communicated with a particulate matter detection channel module, the particulate matter detection channel module is used for detecting particulate matter content, the other path is communicated with a gas detection channel module, and the gas detection channel module is used for detecting gas content.

The utility model will be described with reference to the accompanying drawings, and fig. 1 is a schematic block diagram of a parallel type detection device for particulate matters and gases discharged by a diesel engine in one embodiment of the utility model; FIG. 2 is a schematic block diagram of a parallel type detection device for detecting particulate matters and gases discharged by a diesel engine according to another embodiment of the utility model; FIG. 3 is an optical diagram of a particulate detection module in an embodiment provided by the present invention; FIG. 4 is a schematic structural diagram of a sampling module according to an embodiment of the present invention; and FIG. 5 is a schematic diagram of the distribution of NO concentration measured without a drying module and with a drying module according to an embodiment of the present invention.

As shown in fig. 1 and fig. 2, according to an embodiment of the present invention, a parallel type detection apparatus for detecting particulate matter and gas discharged from a diesel engine includes a sampling module 1, where the sampling module 1 has a particulate matter collecting channel 102 and a gas collecting channel 103; the particle detection channel module comprises a particle detection channel 2 of which the input end is communicated with the output end of the particle collection channel 102, and a particle detection module 3 arranged on the particle detection channel 2; the gas detection channel module comprises a gas detection channel 4, an input end of which is communicated with an output end of the gas collection channel 103, and a first filtering module 5 and a gas detection module 6 which are sequentially arranged on the gas detection channel 4, wherein the first filtering module 5 is used for filtering particles, and the gas detection channel module also comprises a power source 7 arranged on the gas detection channel 4; and an analysis control module 8, wherein the analysis control module 8 is in communication connection with the particulate matter detection module 3, the gas detection module 6 and the power source 7 respectively.

According to the prior art in the patent background art, the emissions of the diesel vehicle contain particulate matters and gas, the two components need to be detected by using different detection modules, most diesel engine tail gas detection equipment in the prior art can only detect one of particulate matters and gas content, and meanwhile, the detection needs two sets of equipment to respectively detect the particulate matters and the gas content, and two persons need to operate back and forth; according to the parallel detection device for the diesel engine to discharge the particulate matters and the gas, the diesel engine discharge is collected in two ways through the particulate matter collection channel 102 and the gas collection channel 103, one way is communicated with the particulate matter detection channel module, the particulate matter detection channel module is used for detecting the content of the particulate matters, the other way is communicated with the gas detection channel module, the gas detection channel module is used for detecting the content of the gas, the content of the particulate matters and the content of the gas can be detected simultaneously, the mutual interference between the detection of the content of the particulate matters and the detection of the content of the gas is avoided, the operation mode is simplified, the single detection of a single person can be realized, and the labor cost is reduced.

In addition, the parallel detection device for the particulate matters and the gas discharged by the diesel engine, disclosed by the utility model, has the following additional technical characteristics:

according to one embodiment of the utility model, the power source 7 is an air pump.

According to some embodiments of the present invention, the power source 7 is disposed between the sampling module 1 and the gas detection module 6, and the power source 7 provides negative pressure to the sampling module, as shown in fig. 1.

According to some embodiments of the present invention, the first filtering module 5, the gas detection module 6 and the power source 7 are sequentially disposed on the gas detection channel 4, and an exhaust port of the power source 7 is communicated with a shielding gas inlet of the particulate matter detection module 3, at which time, the power source 7 outputs a negative pressure to the gas detection module 6, as shown in fig. 2.

According to some embodiments of the present invention, the gas detection channel module further comprises a drying module 9, and the first filtering module 5, the drying module 9 and the gas detection module 6 are sequentially disposed on the gas detection channel 4, as shown in fig. 1 and 2.

The drying module 9 comprises a drying tube, wherein activated carbon particles and molecular sieves are filled in the drying tube, or the drying module 9 comprises a condenser.

The drying tube is filled with granular activated carbon and molecular sieves, so that moisture in the flue gas can be fully absorbed. The condenser can refrigerate the wet flue gas heated by the inner wall of the pipeline quickly, the water is condensed quickly, and accumulated water is discharged by the peristaltic pump at regular time.

The influence of water molecules on the detection result is great, and the detection error is reduced through the drying device.

As shown in fig. 5, the NO concentration in the ambient gas is about 0.02ppm, when the ambient gas is not dried (before point a in fig. 5), the NO concentration in the ambient gas is measured to be 800-1000ppm, and after the ambient gas is dried (after point a in fig. 5), the NO concentration is rapidly reduced to be less than 50ppm, so the accuracy of gas detection is better improved by the drying module.

According to some embodiments of the present invention, the particle detection module 3 comprises a detection cavity 301, and a sampling inlet 302 and an outlet, which are communicated with the output end of the particle collection channel 102, are formed on the side wall of the detection cavity 301; a collimating lens unit located at the right side of the sampling inlet 302, the collimating lens unit having a first lens 303 and a second lens 304 disposed in cooperation with the first lens 303; a light source 311 disposed within the detection cavity 301, the light source 311 being located at a right focal point of the first lens 303; a focusing lens 305 disposed within the detection chamber 301 and to the left of the sampling inlet 302; and a detector 306 disposed within the detection chamber 301 and located at the left focal point of the focusing lens 305, as shown in fig. 3.

The light source 311 is arranged at the focus of the first lens 303, the position of the second lens 304 is adjusted to enable the second lens 304 and the first lens 303 to be matched to achieve an approximately telecentric light path, so that a light beam emitted by the light source 311 passes through the first lens 303 and the second lens 304 and is converted into approximately parallel light, detection errors are reduced, and due to the fact that the approximately parallel light is obtained, the light path can be adjusted to a proper length to avoid the light path being too long, light energy is gradually lost, the length is too short, low-concentration particulate matter detection errors are caused, the structure is simple, and the cost is low.

According to some embodiments of the present invention, the first lens 303 and the second lens 304 are cooperatively disposed, which means that the second lens 304, the first lens 303 and the light source 311 form an approximately telecentric light path, so that the light beam emitted from the light source 311 passes through the first lens 303 and the second lens 304 and is converted into approximately parallel light, and the approximately parallel light forms an included angle of less than or equal to 5 ° with a horizontal line, as shown in fig. 3.

According to some embodiments of the present invention, the detection chamber 301 further has a left shielding gas inlet 309 and a right shielding gas inlet 310 formed thereon, wherein the left shielding gas inlet 309 and the right shielding gas inlet 310 are respectively located between the sampling inlet 302 and the focusing lens 305, and the left shielding gas inlet 309 and the right shielding gas inlet 310 are respectively configured to communicate with a dry clean gas source; the detection chamber 301 has two outlets, a left outlet 307 and a right outlet 308, which are disposed opposite to the left shielding gas inlet 309 and the right shielding gas inlet 310, respectively, as shown in fig. 3.

In order to prevent the optical system from being polluted by smoke, a double-air curtain protection technology is adopted, a protection air inlet is arranged on the left side of the collimating lens unit, dry and clean air is injected from the protection air inlet to be protected against the collimating lens unit, further, a small amount of diesel engine tail air flows to the surface of the collimating lens unit due to the fact that the protection air flows in the detection cavity 301, an outlet is arranged at the position opposite to the protection air inlet, the outlet and the protection air inlet are matched to act, so that after the dry and clean air is injected from the protection air inlet, the protection air forms an even protection air curtain on the left side of the collimating lens unit, and similarly, an even protection air curtain is formed on the right side of the focusing lens 305, and therefore the first lens 303 and the second lens 304 can be well protected.

According to some embodiments of the present invention, the first filtering module 5, the gas detecting module 6 and the power source 7 are sequentially disposed on the gas detecting channel 4, and an exhaust port of the power source 7 passes through a second filtering module for filtering particulate matter and pollutant gas components and is connected to the left shielding gas inlet 309 and the right shielding gas inlet 310, respectively.

The gas without particles is injected into the left side protective gas inlet 309 and the right side protective gas inlet 310 by directly adopting the power source 7, and the power source 7 does not need to be additionally arranged, so that the structure is simplified, and the cost is reduced.

According to some embodiments of the utility model, the light source 311 is an LED lamp.

According to some embodiments of the present invention, the inner wall surface of the detection cavity 301 is roughened.

The inner wall of the detection chamber is roughened to prevent the detection light from being reflected on the inner wall, and the detection error is reduced.

According to some embodiments of the utility model, the detection chamber 301 is externally provided with a heating plate.

According to some embodiments of the present invention, the gas detection module 6 is a non-dispersive infrared absorption detection module or an ultraviolet differential absorption detection module, such as lao model 3026 infrared integrated smoke analyzer and 3023 ultraviolet differential integrated smoke analyzer, and is capable of detecting inorganic gases such as CO, NOx, O2, CO2, and SO 2.

In the prior art, the gas detection module 6 adopts an electrochemical method, the method is low in precision and large in interference, the current detection requirement cannot be met, and the scheme adopts a non-dispersive infrared absorption method or an ultraviolet differential absorption method, so that the accuracy is higher.

According to some embodiments of the utility model, the acquisition module comprises a sample tube body 101; a particulate matter collection channel 102 and a gas collection channel 103 formed side by side in the sampling tube body 101; the heat insulation pipe 104 is sleeved on the outer peripheral surface of the sampling pipe body 101, and the front end of the sampling pipe body 101 extends out of the heat insulation pipe 104; and a back pressure detection module 106 fixedly installed at the front end of the sampling tube body 101, as shown in fig. 4.

The backpressure detection module 106 can detect the backpressure of the exhaust port of the diesel engine while sampling, and the detection accuracy is improved.

According to some embodiments of the present invention, the sampling tube body 101 is fixedly mounted at the front end of the sampling tube body 101 by a retaining clip 105, as shown in FIG. 4.

According to some embodiments of the present invention, the thermal insulation pipe 104 is sleeved on the transmission line 107 of the back pressure detection module 106 and the outside of the collection pipe body, as shown in fig. 4.

According to some embodiments of the utility model, the collection port of the gas collection channel 103 is provided with a particulate filter 108, as shown in fig. 4.

According to some embodiments of the present invention, the sampling tube further comprises a gas collection tube and a particulate collection tube, wherein the orifice of the gas collection tube forms the gas collection channel 103, the orifice of the particulate collection tube forms the particulate collection channel 102, and the sampling tube body 101 is sleeved outside the gas collection tube and the particulate collection tube, as shown in fig. 4.

According to some embodiments of the utility model, the gas collection tube and the particulate collection tube are tubular bodies made of polytetrafluoroethylene.

The pipe body made of polytetrafluoroethylene is used as a gas collecting pipe and a particulate matter collecting pipe, so that the particulate matter and gas can be better prevented from being adsorbed by the pipe wall.

According to some embodiments of the utility model, the sampling tube body 101 is a bellows.

The bellows can be crooked but difficult rupture, and protective gas collection pipe and particulate matter collection pipe that can be better, and guarantee to detect not influenced.

According to some embodiments of the utility model, the insulating tube 104 is a tube of insulating material.

According to some embodiments of the utility model, the thermal insulation material is asbestos or glass fiber wool.

According to some embodiments of the utility model, the gas collection tube has a cross-sectional area that is less than a cross-sectional area of the particulate collection tube.

According to some embodiments of the present invention, the parallel detection device further comprises a human-computer interaction module in communication with the analysis control module 8, as shown in fig. 1 and 2.

The man-machine interaction module 10 (terminal device) can realize remote operation and can see the change of the detection data in real time.

According to another aspect of the utility model, a detection method based on the parallel detection device for the exhaust particulate matters and gases of the diesel engine is also provided, and the detection method comprises the following steps:

inserting a sampling end of the sampling module 1 into an exhaust port of a diesel engine;

step two, stepping the throttle of the diesel engine to the maximum, and detecting through the parallel detection device, wherein the specific detection steps are as follows: the sampling module 1 is divided into two paths to simultaneously collect diesel engine emissions; one path of emission is conveyed to the particulate matter detection channel 2 through the particulate matter collection pipeline, enters the particulate matter detection module 3 to be detected to obtain particulate matter detection information, and sends the particulate matter detection information to the analysis control module 8; the other path of emission is powered by the power source 7, is conveyed to the gas detection channel 4 through the gas collection pipeline, is filtered by the first filtering module 5, is dehumidified by the drying module 9, and finally enters the gas detection module 6 to be detected to obtain gas detection information and send the detection information to the analysis control module 8;

repeating the above steps two or three times, and analyzing the particulate matter detection information and the gas detection information received three times by the analysis control module 8 to obtain detection data; the analysis control module 8 uploads the detection data to a human-computer interaction interface in a wired or wireless (wifi, bluetooth) communication mode.

Any reference to "one embodiment," "an embodiment," "example embodiment," etc., means that a particular feature, structure, or characteristic described in connection with the embodiment is included in at least one embodiment of the utility model; the schematic representations in various places in the specification do not necessarily refer to the same embodiment; further, when a particular feature, structure, or characteristic is described in connection with any embodiment, it is submitted that it is within the purview of one skilled in the art to effect such feature, structure, or characteristic in connection with other ones of the embodiments.

While specific embodiments of the utility model have been described in detail with reference to a number of illustrative embodiments thereof, it should be understood that numerous other modifications and embodiments can be devised by those skilled in the art that will fall within the spirit and scope of the principles of this invention; in particular, reasonable variations and modifications are possible in the component parts and/or arrangements of the subject combination arrangement within the scope of the foregoing disclosure, the drawings and the appended claims without departing from the spirit of the utility model; except variations and modifications in the component parts and/or arrangements, the scope of which is defined by the appended claims and equivalents thereof.

Claims (9)

1. A parallel detection device for particulate matters and gases discharged by a diesel engine is characterized by comprising:

a sampling module having a particulate matter collection channel and a gas collection channel;

the particle detection channel module comprises a particle detection channel of which the input end is communicated with the output end of the particle collection channel, and a particle detection module arranged on the particle detection channel;

the gas detection channel module comprises a gas detection channel, a first filtering module and a gas detection module, wherein the input end of the gas detection channel is communicated with the output end of the gas acquisition channel, the first filtering module and the gas detection module are sequentially arranged on the gas detection channel, and the gas detection channel module also comprises a power source arranged on the gas detection channel; and

an analysis control module in communication with the particulate detection module, the gas detection module, and the power source, respectively.

2. A parallel particulate matter and gas detecting device for diesel engine exhaust according to claim 1, wherein the power source is disposed between the sampling module and the gas detecting module.

3. A parallel type detecting device for particulate matter and gas discharged from a diesel engine according to claim 1, wherein the first filtering module, the gas detecting module and the power source are sequentially disposed on the gas detecting channel, and an exhaust port of the power source is communicated with a shielding gas inlet of the particulate matter detecting module.

4. A parallel type detecting device for particulate matter and gas discharged from a diesel engine according to claim 1, wherein the gas detecting channel module further comprises a drying module, and the first filtering module, the drying module and the gas detecting module are sequentially disposed on the gas detecting channel.

5. The parallel detection device for the exhaust of the particulate matters and the exhaust gas of the diesel engine according to claim 1, wherein the particulate matter detection module comprises a detection cavity, and a sampling inlet and a sampling outlet which are communicated with an output end of the particulate matter collection channel are formed in a side wall of the detection cavity; the collimating lens unit is positioned on the right side of the sampling inlet and is provided with a first lens and a second lens matched with the first lens; a light source disposed within the detection cavity, the light source being located at a right focus of the first lens; a focusing lens disposed within the detection cavity and positioned to the left of the sampling inlet; and the detector is arranged in the detection cavity and is positioned at the left focal point of the focusing lens.

6. The parallel type detection device for the particulate matters and the gas discharged by the diesel engine according to claim 5, wherein a left side shielding gas inlet and a right side shielding gas inlet are formed on the detection cavity and are respectively positioned between the sampling inlet and the focusing lens unit; the detection cavity is provided with two outlets, and the two outlets are a left outlet and a right outlet which are respectively opposite to the left side shielding gas inlet and the right side shielding gas inlet.

7. A parallel type detection device for particulate matter and gas emission from a diesel engine according to claim 6, wherein the first filtering module, the gas detection module and the power source are sequentially disposed on the gas detection channel, and the exhaust port of the power source is connected to the left shielding gas inlet and the right shielding gas inlet respectively.

8. A parallel detection device for particulate matter and gas emitted by a diesel engine according to claim 1, wherein the gas detection module is a non-dispersive infrared absorption detection module or an ultraviolet differential absorption detection module.

9. A parallel type detection device for particulate matter and gas discharged by a diesel engine according to claim 1, characterized in that the sampling module comprises a sampling pipe body; a particulate matter collection channel and a gas collection channel formed in the sampling tube body side by side; the heat preservation pipe is sleeved on the outer peripheral surface of the sampling pipe body, and the front end of the sampling pipe body extends out of the heat preservation pipe; and a back pressure detection module fixedly arranged at the front end of the sampling pipe body.

Images