CN215812277U - Particulate matter sensor, exhaust device and vehicle - Google Patents
Particulate matter sensor, exhaust device and vehicle Download PDFInfo
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- CN215812277U CN215812277U CN202121945998.4U CN202121945998U CN215812277U CN 215812277 U CN215812277 U CN 215812277U CN 202121945998 U CN202121945998 U CN 202121945998U CN 215812277 U CN215812277 U CN 215812277U
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Abstract
The utility model discloses a particulate matter sensor, an exhaust device and a vehicle, wherein the particulate matter sensor comprises a gas-guiding pipe, a lower protective cover and a measuring unit arranged in the gas-guiding pipe, the upper part of the gas-guiding pipe is provided with a gas inlet, the lower end of the gas-guiding pipe is provided with a gas outlet, the upper end of the lower protective cover is plugged, the lower end of the lower protective cover is plugged, the circumferential surface of the lower protective cover is provided with a tangential port, and gas flows into the gas-guiding pipe after sequentially flowing through the tangential port and the gas inlet and flows out from the gas outlet. According to the utility model, the lower shield is provided with the plurality of tangential ports, so that the tail gas enters between the outer surface of the air guide pipe and the inner surface of the lower shield in a tangential manner and rotates upwards around the center of the air guide pipe, and metal particles are collected on the inner surface of the lower shield more easily. Meanwhile, the distance of the rotating path is shorter than that of the straight line, so that metal particles can be fully adhered by water drops on the outer surface of the air guide pipe and the inner surface of the lower shield, the risk that the zirconium element is polluted by metal powder is reduced, and the accuracy of a measuring result is improved.
Description
Technical Field
The utility model relates to the field of engines, in particular to a particulate matter sensor, an exhaust device and a vehicle.
Background
Diesel engines are efficient and fuel efficient, but particulate matter (PM, also called carbon particulate) emissions are the first obstacle affecting diesel engine utilization. With the upgrading of diesel vehicle emission standards, especially PM and Nitrogen Oxides (NO)X) Continuous tightening of limit value only by means of engine reductionLow combustion pollutants and diesel oxidation catalysts have failed to meet regulatory requirements. In projects of the country VI and the country V, the emission of PM is reduced by adding a DPF (Diesel Particulate Filter), which is one of the most effective means for reducing PM currently recognized, and the purification efficiency can reach more than 90%. Regeneration of DPF filters is a key technology for practical use of DPFs.
The principle of DPF for trapping particulate matters is that tail gas enters DPF pore channels, the pore channels are of a dead-end structure, carbon particles filtered by the wall surfaces of the pore channels are left in the pore channels and stored, the tail gas can be discharged only through capillary gaps on the wall surfaces between the pore channels, and the DPF is guaranteed to have a good filtering effect through small capillary gaps.
GB 18352.6-2016 limit for light-duty automotive pollutant emissions and methods of measurement (sixth stage of china) requires that there be a product, such as a particulate matter sensor, in the exhaust gas treatment after-treatment system that monitors particulate matter leakage. The particle sensor is provided with a measuring unit such as a zirconium element, the zirconium element is provided with a groove, and when exhaust gas flows through the zirconium element of the PM sensor, PM is collected by the groove of the zirconium element, so that the particulate matter concentration measurement is realized.
However, in practice, the measurement cell of the particle sensor, i.e. the zirconium element, is at risk of being contaminated by metal powder. If metal powder is collected in the groove of the zirconium element, the particle sensor can report a short-circuit fault due to the strong metal conductivity, so that the particle sensor can self-think that PM is filled in the groove, measurement errors are caused, and the accuracy and reliability of the measurement result of the particle sensor are low.
SUMMERY OF THE UTILITY MODEL
Aiming at the existing problems, the utility model provides a particulate matter sensor, which solves the problem that a measuring unit of the particulate matter sensor is easily polluted by metal powder in tail gas, so that the accuracy and the reliability of a measuring result are poor.
In order to achieve the above object, the particle sensor according to the embodiment of the present invention includes a gas-guiding pipe, a lower shield surrounding an outer surface of the gas-guiding pipe, a lower shield disposed outside the gas-guiding pipe, and a measurement unit disposed inside the gas-guiding pipe, wherein an air inlet is disposed at an upper portion of the gas-guiding pipe, an air outlet is disposed at a lower end of the gas-guiding pipe, an upper end of the lower shield is sealed, a lower end of the lower shield is sealed, a tangential port is disposed on a circumferential surface of the lower shield, and air flows into the gas-guiding pipe and flows out from the air outlet after sequentially flowing through the tangential port and the air inlet.
In addition, the particulate matter sensor according to the embodiment of the utility model may also have the following additional technical features:
further, the cut-out direction of the tangential port is configured to be obliquely upward along the central axis of the bleed air duct.
Further, the number of the tangential ports is plural.
Further, the plurality of tangential ports are configured to be evenly distributed on the lower shroud about a central axis of the bleed air duct.
Further, at least one of an outer surface of the bleed duct and an inner surface of the lower shroud is coated with a mesoporous molecular sieve.
Further, the mesoporous molecular sieve is configured to at least one of a saturated water absorption greater than a preset water absorption threshold, a desorption temperature lower than a preset temperature threshold, and a desorption rate greater than a preset desorption rate threshold.
Further, the bleed air duct and the lower shroud are configured to be disposed perpendicular to a ground direction.
Further, the particle sensor also comprises an insulator connected to the top end of the air entraining pipe, a sliding stone block arranged on the top end of the insulator, and a protective cover wrapping the insulator and the sliding stone block, wherein the protective cover is fixedly connected to the upper end of the lower protective cover, and the measuring unit sequentially penetrates through the insulator and the sliding stone block upwards.
In view of the existing problems, the utility model further provides an exhaust device, which comprises the particulate matter sensor according to the embodiment of the utility model, so that the problem that the measurement unit of the particulate matter sensor is easily polluted by metal powder in the exhaust gas, and the accuracy and reliability of the measurement result are poor is solved.
In view of the existing problems, the utility model provides a vehicle comprising the exhaust device according to the above embodiment of the utility model, so as to solve the problem that the measurement unit of the particulate matter sensor is easily polluted by metal powder in the exhaust gas, which results in poor accuracy and reliability of the measurement result.
Compared with the prior art, the utility model has the following beneficial effects:
(1) the lower protective cover is provided with a plurality of tangential ports, so that the tail gas enters between the outer surface of the air guide pipe and the inner surface of the lower protective cover in a tangential mode and rotates upwards around the center of the air guide pipe. Due to the centrifugal force during rotation, metal particles are more easily collected to the inner surface of the lower shield. Meanwhile, the distance of the rotating path is shorter than the distance of the straight line, which is equivalent to increasing the distance of the tail gas entering the air guide pipe, so that the contact time of metal particles in the tail gas and the inner surface of the lower shield is increased, the metal particles can be fully adhered by water drops on the outer surface of the air guide pipe and the inner surface of the lower shield, the risk of the zirconium element being polluted by metal powder is effectively reduced, and the accuracy and the reliability of the measurement result are favorably improved.
(2) The utility model combines the special environment in the particle sensor, at least one of the outer surface of the air guide pipe and the inner surface of the lower shield is additionally provided with the mesoporous molecular sieve, and the capability of the air guide pipe and/or the lower shield for adsorbing water droplet particles is improved by utilizing the mesoporous molecular sieve, so that metal particles can be adhered by more water droplet particles, the metal particles are prevented from entering the air guide pipe to pollute a measurement unit, such as a zirconium element, the risk that the zirconium element is polluted by metal powder can be further effectively reduced, and the accuracy and the reliability of the measurement result of the particle sensor are improved.
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 structural view of a particulate matter sensor according to an embodiment of the present invention;
fig. 2 is a schematic structural view of a particulate matter sensor according to another embodiment of the present invention.
Detailed Description
Embodiments of the present invention will be described in detail below, the embodiments described with reference to the drawings being illustrative, and the embodiments of the present invention will be described in detail below.
A particulate matter sensor, an exhaust device, and a vehicle according to an embodiment of the utility model are described below with reference to fig. 1 to 2.
Fig. 1 is a schematic structural view of a particulate matter sensor. As shown in fig. 1, a particle sensor 100 includes a bleed air pipe 110 and a lower shield 120 disposed around the bleed air pipe 110, an air inlet 180 is opened at an upper portion of the bleed air pipe 110, an air outlet 111 is disposed at a lower end of the bleed air pipe 110, and an upper end of the lower shield 120 is blocked.
Specifically, the upper end of the lower shield 120 may be sealed by welding a metal sheet between the upper end of the lower shield 120 and the bleed air pipe 110; or, the upper end of the lower shield 120 is directly welded or sealed and bonded to the outside of the bleed air pipe 110 after necking down, so as to realize the upper end plugging of the lower shield 120; alternatively, the upper end of the lower shield 120 may be sealed by providing a seal between the upper end of the lower shield 120 and the outside of the bleed air duct 110. It is to be understood that the above-mentioned blocking manner is merely an exemplary description, and the manner of achieving the blocking of the upper end of the lower shield 120 is not limited thereto. In the embodiment of the present invention, any plugging manner that can plug the upper end of the lower shield 120 to prevent the tail gas from flowing out of the upper end of the lower shield 120 is suitable for the present invention, and for reducing redundancy, detailed description is not repeated here.
As shown in FIG. 1, the particulate matter sensor 100 can also include a shield 130, an insulator 140, a talc block 150, and a measurement unit 160, such as a zirconium element, for example, as shown in FIG. 1. Wherein the zirconium element is arranged inside the bleed air pipe 110, the insulator 140 is connected to the top end of the bleed air pipe 110, the smooth stone block 150 is arranged on the top end of the insulator 140, the insulator 140 and the smooth stone block 150 are arranged in the shield 130, namely, the shield 130 wraps the insulator 140 and the smooth stone block 150, and the shield 130 is fixedly connected with the upper end of the lower shield 130 to play a role of protection. The measuring unit 160 passes through the insulator 140 and the talc block 150 in order upward. Wherein the measurement cell 160, such as a zirconium element, has a groove therein for collecting particulate matter. Generally, the exhaust gas flows in between the outer surface of the bleed air duct 110 and the inner surface of the lower shield 120, enters the inside of the bleed air duct 110 through the air inlet 180 disposed at the upper portion of the bleed air duct 110, and is discharged through the air outlet 111 at the lower end of the bleed air duct 110.
In an embodiment of the present invention, at least one of the outer surface of the bleed air duct 110 and the inner surface of the lower shield 120 is coated with a mesoporous molecular sieve to improve the ability of the bleed air duct 110 and/or the lower shield 120 to adsorb water droplet particles in the exhaust gas.
Specifically, a mesoporous molecular sieve may be coated on one of the outer surface of the bleed air pipe 110 and the inner surface of the lower shroud 120, so as to adsorb more water droplets in the exhaust gas through the mesoporous molecular sieve, thereby achieving the adhesion and collection of metal particles. The outer surface of the bleed pipe 110 and the inner surface of the lower shield 120 may be coated with the mesoporous molecular sieve at the same time, and when both the outer surface of the bleed pipe 110 and the inner surface of the lower shield 120 are coated with the mesoporous molecular sieve, compared to when the outer surface of the bleed pipe 110 or one of the inner surfaces of the lower shield 120 is coated with the mesoporous molecular sieve, since the coating area of the mesoporous molecular sieve is larger, more water droplet particles can be adsorbed, and then more metal particles are adhered and collected, and the adhesion efficiency of the metal particles is improved.
Therefore, in the particle sensor 100, the mesoporous molecular sieve is additionally arranged on the outer surface of the bleed pipe 110 and/or the inner surface of the lower shield 120, and the mesoporous molecular sieve is used for adsorbing more water droplet particles to adhere to the metal particles, so that the metal particles are prevented from entering the bleed pipe to pollute the measurement unit 160, such as a zirconium element, the risk that the zirconium element is polluted by metal powder can be effectively reduced, and the accuracy and the reliability of the measurement result of the particle sensor 100 are improved.
In one embodiment of the utility model, the mesoporous molecular sieve is configured to have a saturated water absorption greater than a predetermined water absorption threshold.
Specifically, the preset water absorption threshold is a preset empirical value, which can be flexibly configured according to actual requirements, such as being flexibly set according to factors of different vehicle models, different displacement volumes, and the like. When the mesoporous molecular sieve is configured to have a saturated water absorption capacity greater than a preset water absorption capacity threshold, the mesoporous molecular sieve is considered to be a high water absorption mesoporous molecular sieve, and the water absorption capacity of the mesoporous molecular sieve is large.
In a specific embodiment, the preset water absorption threshold is, for example, 70%, i.e., when the mesoporous molecular sieve is configured to have a saturated water absorption greater than 70%, it is considered to be a highly water-absorbing mesoporous molecular sieve.
In one embodiment of the utility model, the mesoporous molecular sieve is configured such that the desorption temperature is below a preset temperature threshold.
Specifically, the preset temperature threshold is a preset empirical value, which can be flexibly configured according to actual requirements, such as according to different vehicle models, the length of the exhaust pipe, the number of silencers, and the like. When the desorption temperature of the mesoporous molecular sieve is lower than the preset temperature threshold, the mesoporous molecular sieve is considered to be a low-temperature desorption mesoporous molecular sieve, which can realize desorption of metal particles at a lower temperature, so that desorption is easy, the desorption speed is higher, and the desorption efficiency is high.
In a specific embodiment, the preset temperature threshold is, for example, 200 ℃, that is, when the mesoporous molecular sieve is configured to have a desorption temperature less than 200 ℃, for example, 180 ℃, desorption of the metal particles can be achieved, and the mesoporous molecular sieve has a lower desorption temperature, is easy to desorb, facilitates rapid desorption, and improves desorption efficiency.
In one embodiment of the utility model, the mesoporous molecular sieve is configured to have a desorption rate greater than a preset desorption rate threshold.
Specifically, the preset removal rate threshold is a preset empirical value, and can be flexibly configured according to actual requirements, such as according to factors such as the type of fuel, whether fuel combustion is sufficient, and the like. When the mesoporous molecular sieve is configured to have the removal rate greater than the preset removal rate threshold, the mesoporous molecular sieve is considered to be the mesoporous molecular sieve with high removal rate, and the desorption of the metal particles is more thorough, so that the desorption effect is improved.
In a specific embodiment, the preset removal rate threshold is, for example, 90%, that is, when the removal rate of the mesoporous molecular sieve is configured to be greater than the preset removal rate threshold, the mesoporous molecular sieve is considered to be a mesoporous molecular sieve with a high removal rate, so that the desorption of the metal particles is more thorough and the desorption effect is better.
In one embodiment of the present invention, when the mesoporous molecular sieve is configured such that the saturated water absorption is greater than the preset water absorption threshold, the desorption temperature is lower than the preset temperature threshold, and the desorption rate is greater than the preset desorption rate threshold, the mesoporous molecular sieve is considered to be a high water absorption mesoporous molecular sieve with low temperature desorption and high desorption rate. The super absorbent mesoporous molecular sieve adheres metal particles by using water droplet particles adsorbed by the super absorbent mesoporous molecular sieve, prevents the metal particles from entering the air-entraining pipe to pollute the measuring unit 160, such as a zirconium element, and can effectively reduce the risk of the zirconium element being polluted by metal powder, thereby improving the accuracy and reliability of the measuring result of the particle sensor 100.
In another embodiment of the present invention, as shown in fig. 2, the lower end of the lower shield 120 is closed, a tangential port 170 is opened on the circumferential surface of the lower shield 120, and the air flows into the bleed air pipe after sequentially flowing through the tangential port 170 and the air inlet 180, and flows out from the air outlet 111.
Specifically, the lower end of the lower shield 120 may be sealed by welding a metal sheet between the lower end of the lower shield 120 and the bleed air duct 110; or, the lower end of the lower shield 120 is directly welded or sealed and bonded to the outside of the bleed air pipe 110 after necking down, so as to realize the lower end plugging of the lower shield 120; alternatively, the lower end of the lower shield 120 may be sealed by providing a seal between the lower end of the lower shield 120 and the outside of the bleed air duct 110. It is to be understood that the above-mentioned blocking manner is merely an exemplary description, and the manner of achieving the blocking of the lower end of the lower shield 120 is not limited thereto. In the embodiment of the present invention, any plugging manner that can plug the lower end of the lower protection cover 120 to prevent the tail gas from flowing out from the lower end of the lower protection cover 120 is suitable for the present invention, and for reducing redundancy, detailed description is not repeated here.
In one embodiment of the utility model the cut-out direction of the tangential port 170 is arranged obliquely upwards along the central axis of the bleed air duct. Specifically, the slit direction may be inclined to the upper left or inclined to the upper right, and in the example shown in fig. 2, the slit direction is inclined to the upper left.
That is, as shown in fig. 1 and 2, in the specific embodiment, the exhaust gas does not enter between the outer surface of the bleed air pipe 110 and the inner surface of the lower shield 120, but enters through the tangential port 170 formed in the lower shield 120, so that the exhaust gas tangentially enters between the outer surface of the bleed air pipe 110 and the inner surface of the lower shield 120, enters the bleed air pipe 110 through the air inlet 180, and is finally discharged through the air outlet 111. At this time, the airflow rotates upward around the center of the bleed air pipe 110, and the metal particles are more easily thrown to the inner surface of the lower shield 120 due to the centrifugal force during the rotation, which is beneficial to realize the desorption.
In one embodiment of the present invention, the number of the tangential ports 170 is plural, and in the description of the present invention, "plural" means two or more, thereby increasing the efficiency of the exhaust gas introduction.
In one embodiment of the utility model, the plurality of tangential ports 170 are configured to be evenly distributed on the lower shroud 120 about the central axis of the bleed air duct 110. Therefore, the uniform input of the tail gas is realized, the transmission efficiency of the tail gas after entering is improved, and meanwhile, the structure attractiveness is improved.
The mesoporous molecular sieve has the functions of preventing aggregation and dispersion on water drops. In a particular embodiment, the outer surface of the bleed air duct 110 and the inner surface of the lower shield 120 are coated with a mesoporous molecular sieve to enhance the ability of the bleed air duct 110 and the lower shield 120 to adsorb water droplet particles in the exhaust gas, respectively. After the vehicle is turned off, the probe of the particle sensor 100 cools faster than the water vapor in the exhaust because it is made of metal. At this time, the water vapor is adsorbed and uniformly distributed on the outer surface of the bleed air duct 110 of the particulate matter sensor 100 and the inner surface of the lower shroud 120, forming water droplets.
After the vehicle is started next time, the metal particles in the exhaust gas move to the inside of the particle sensor 100 along with the exhaust gas, and the metal particles in the exhaust gas contact and adhere to the dispersed small water droplets on the mesoporous molecular sieves on the outer surface of the bleed air pipe 110 and the inner surface of the lower shield 120, so that the metal particles in the exhaust gas are collected in the process.
In one embodiment of the present invention, the bleed air duct 110 and the lower shield 120 are configured to be disposed perpendicular to the ground surface so that metal particles fall from the particulate matter sensor 100 due to their own weight after the temperature of the exhaust gas rises (e.g., more than 200 °) or for a long time, so that water droplet particles on the mesoporous molecular sieve in the particulate matter sensor 100 can repeatedly collect the metal particles in the exhaust gas.
Specifically, as shown in fig. 2, the air inlet structure of the particle sensor 100 is changed, and the tangential port 170 is formed in the lower shield, so that the exhaust enters between the outer surface of the bleed air pipe 110 and the inner surface of the lower shield 120 tangentially, and rotates upwards around the center of the bleed air pipe 110, thereby increasing the distance for the exhaust to enter the bleed air pipe 110, and increasing the time for the metal particles in the exhaust to contact with the inner surface of the lower shield 120, so that the metal particles can be fully adhered by water drops on the outer surface of the bleed air pipe 110 and the inner surface of the lower shield 120, and the risk of the zirconium element being polluted by metal powder is effectively reduced.
In a specific embodiment, the particle sensor 100 is arranged to face downward, collected metal particles are temporarily retained on the outer surface of the bleed air pipe 110 and the inner surface of the lower shield 120, when the exhaust temperature is increased (for example, > 200 ℃) or after a long time (a vehicle runs for dozens of kilometers), the metal particles can fall off and fall off due to self gravity, the metal particles are prevented from entering the pipe to pollute the zirconium element, and the accuracy and reliability of the measurement result of the particle sensor 100 are improved.
In a specific example, the probability of the particulate matter sensor 100 being contaminated by metal particles is reduced to 1/20 by the combined use of two methods, namely coating a high water absorption mesoporous molecular sieve and opening the tangential ports 170.
The particulate matter sensor 100 according to the embodiment of the utility model has the following beneficial effects:
(1) according to the utility model, in combination with the special environment inside the particulate matter sensor 100, the mesoporous molecular sieves are additionally arranged on the outer surface of the air-entraining pipe 110 and the inner surface of the lower shield 120, and the capability of the air-entraining pipe and/or the lower shield for adsorbing water droplet particles is improved by using the mesoporous molecular sieves, so that metal particles can be adhered by more water droplet particles, and the metal particles are prevented from entering the air-entraining pipe to pollute a zirconium element.
(2) The exhaust air enters between the outer surface of the bleed air pipe 110 and the inner surface of the lower shield 120 tangentially by opening a plurality of tangential ports 170 in the lower shield 120 and rotates upward around the center of the bleed air pipe 110. The metal particles are more easily collected to the inner surface of the lower shroud 120 due to the centrifugal force during the rotation. Meanwhile, the distance of the rotating path is shorter than the distance of the straight line, which is equivalent to increasing the distance of the tail gas entering the air guide pipe, so that the contact time of the metal particles in the tail gas and the inner surface of the lower shield is increased, the metal particles can be fully adhered by water drops on the outer surface of the air guide pipe 110 and the inner surface of the lower shield 120, the risk of the zirconium element being polluted by metal powder is effectively reduced, and the accuracy and the reliability of the measurement result of the particle sensor 100 are improved.
Further embodiments of the present invention also disclose an exhaust device for a vehicle, the exhaust device comprising the particulate matter sensor 100 described in any of the above embodiments of the present invention.
In one embodiment of the present invention, the particulate matter sensor 100 is configured to be disposed perpendicular to the ground direction. So that after the temperature of the exhaust gas rises (e.g., more than 200 deg.) or for a long time, the adhered metal particles fall from the particulate matter sensor due to its own weight, so that the water droplet particles on the mesoporous molecular sieve in the particulate matter sensor 100 can repeatedly collect the metal particles in the exhaust gas.
According to the exhaust device provided by the embodiment of the utility model, the following beneficial effects are achieved:
(1) according to the utility model, in combination with the special environment inside the particulate matter sensor 100, the mesoporous molecular sieves are additionally arranged on the outer surface of the air-entraining pipe 110 and the inner surface of the lower shield 120, and the capability of the air-entraining pipe and/or the lower shield for adsorbing water droplet particles is improved by using the mesoporous molecular sieves, so that metal particles can be adhered by more water droplet particles, and the metal particles are prevented from entering the air-entraining pipe to pollute a zirconium element.
(2) The exhaust gas enters between the outer surface of the bleed air pipe 110 and the inner surface of the lower shield 120 tangentially by opening a plurality of tangential ports in the lower shield 120 and rotates upward around the center of the bleed air pipe 110. The metal particles are more easily collected to the inner surface of the lower shroud 120 due to the centrifugal force during the rotation. Meanwhile, the distance of the rotating path is shorter than the linear distance, which is equivalent to increasing the distance of the tail gas entering the bleed air pipe 110, so that the contact time of the metal particles in the tail gas and the inner surface of the lower shield 120 is increased, the metal particles can be fully adhered by water drops on the outer surface of the bleed air pipe 110 and the inner surface of the lower shield 120, the risk of the zirconium element being polluted by metal powder is effectively reduced, and the accuracy and the reliability of the measurement result of the particle sensor 100 are improved.
Further embodiments of the utility model also disclose a vehicle comprising an exhaust apparatus as described in any of the above embodiments of the utility model.
According to the vehicle provided by the embodiment of the utility model, the following beneficial effects are achieved:
(1) according to the utility model, in combination with the special environment inside the particulate matter sensor 100, the mesoporous molecular sieves are additionally arranged on the outer surface of the air-entraining pipe 110 and the inner surface of the lower shield 120, and the capability of the air-entraining pipe and/or the lower shield for adsorbing water droplet particles is improved by using the mesoporous molecular sieves, so that metal particles can be adhered by more water droplet particles, and the metal particles are prevented from entering the air-entraining pipe to pollute a zirconium element.
(2) The exhaust gas enters between the outer surface of the bleed air pipe 110 and the inner surface of the lower shield 120 tangentially by opening a plurality of tangential ports in the lower shield 120 and rotates upward around the center of the bleed air pipe 110. The metal particles are more easily collected to the inner surface of the lower shroud 120 due to the centrifugal force during the rotation. Meanwhile, the distance of the rotating path is shorter than the linear distance, which is equivalent to increasing the distance of the tail gas entering the bleed air pipe 110, so that the contact time of the metal particles in the tail gas and the inner surface of the lower shield 120 is increased, the metal particles can be fully adhered by water drops on the outer surface of the bleed air pipe 110 and the inner surface of the lower shield 120, the risk of the zirconium element being polluted by metal powder is effectively reduced, and the accuracy and the reliability of the measurement result of the particle sensor 110 are improved.
While embodiments of the utility model have been shown and described, it will be understood by those of ordinary skill in the art that: various changes, modifications, substitutions and alterations can be made to the embodiments without departing from the principles and spirit of the utility model, the scope of which is defined by the claims and their equivalents.
Claims (10)
1. The utility model provides a particulate matter sensor, includes the bleed air pipe, encircle set up in the outside lower guard shield of bleed air pipe, and set up the inside measuring unit of bleed air pipe, the air inlet has been seted up on the upper portion of bleed air pipe, the lower extreme of bleed air pipe is provided with the gas outlet, the upper end shutoff of lower guard shield, its characterized in that, the lower extreme shutoff of lower guard shield, the tangential mouth has been seted up on the global of lower guard shield, and gas flows through in proper order the tangential mouth with flow in behind the air inlet in the bleed air pipe, and follow the gas outlet flows out.
2. The particulate matter sensor of claim 1 wherein a cut-out direction of the tangential port is configured to be obliquely upward along a central axis of the bleed air duct.
3. The particulate matter sensor according to claim 1 or 2, wherein the number of the tangential ports is plural.
4. The particulate matter sensor of claim 3 wherein the plurality of tangential ports are configured to be evenly distributed on the lower shroud about a central axis of the bleed duct.
5. The particulate matter sensor of claim 1, wherein at least one of an outer surface of the bleed conduit and an inner surface of the lower shroud is coated with a mesoporous molecular sieve.
6. The particulate matter sensor of claim 5, wherein the mesoporous molecular sieve is configured to at least one of absorb water at a saturation level greater than a preset water absorption threshold, desorb temperature below a preset temperature threshold, and strip rate greater than a preset strip rate threshold.
7. The particulate matter sensor of claim 1, wherein the bleed duct and the lower shroud are configured to be disposed perpendicular to a ground direction.
8. The particle sensor of claim 1, further comprising an insulator attached to the tip of said bleed duct, a lump of talc disposed on the tip of said insulator, and a shield surrounding said insulator and said lump of talc, said shield being fixedly attached to the upper end of said lower shield, said measurement unit passing upwardly through said insulator and said lump of talc in this order.
9. An exhaust device for a vehicle, characterized by comprising the particulate matter sensor according to any one of claims 1 to 8.
10. A vehicle characterized by comprising the exhaust apparatus according to claim 9.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202121945998.4U CN215812277U (en) | 2021-08-18 | 2021-08-18 | Particulate matter sensor, exhaust device and vehicle |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202121945998.4U CN215812277U (en) | 2021-08-18 | 2021-08-18 | Particulate matter sensor, exhaust device and vehicle |
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| Publication Number | Publication Date |
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| CN215812277U true CN215812277U (en) | 2022-02-11 |
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| CN202121945998.4U Active CN215812277U (en) | 2021-08-18 | 2021-08-18 | Particulate matter sensor, exhaust device and vehicle |
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2021
- 2021-08-18 CN CN202121945998.4U patent/CN215812277U/en active Active
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