CN207420670U - Diesel motor black-smoke purifier - Google Patents
Diesel motor black-smoke purifier Download PDFInfo
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- CN207420670U CN207420670U CN201721462019.3U CN201721462019U CN207420670U CN 207420670 U CN207420670 U CN 207420670U CN 201721462019 U CN201721462019 U CN 201721462019U CN 207420670 U CN207420670 U CN 207420670U
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Abstract
The utility model provides a kind of diesel motor black-smoke purifier, including a cavity, the cavity has an air inlet, one exhaust outlet and an internal chamber, make gas that can be entered by air inlet, it is discharged after flowing through internal chamber by exhaust outlet, internal chamber is filled with multiple catalyst grains, and blocker plate is provided in internal chamber, blocker plate can guide and change the flow direction of gas, disturb air-flow, thereby, diesel motor black-smoke purifier can improve the time and chance that pollutant is contacted with catalyst grains in gas, it reduces pollutant and leaks untreated and discharged chance, air-flow is avoided or reduced to take pollutant out of, help to improve the processing capacity of diesel motor black-smoke purifier.
Description
Technical field
The utility model is on CC Catalytic Converter, particularly relates to be used in diesel motor to reduce the purification of exhaust black smoke
Device.
Background technology
The diesel motor of today is widely used in various vehicles, ship and dynamic power machine, can be provided by force for various machinery
The power resources of strength however, diesel oil can generate a variety of pollutants being difficult to avoid that when burning in diesel motor, and are arranged with engine
Gas is discharged, if cannot suitably be pocessed, it will environment is caused to seriously endanger.
It at present for engine exhaust, is handled mostly using catalyst device, the pollutant in being vented with reduction, such as in
State's Taiwan TW I583863 patents are to provide the automatic purification device of engine exhaust, wherein, in existing catalyst device or
In purifier, in order to improve the time that exhaust is contacted with catalyst, venting channel can expand caliber at catalyst device, make exhaust
Flow velocity reduce, however, catalyst device is to use through formula filtering element (cartridge) mostly, easily make exhaust that layer occur under low flow velocity environment
Stream causes have local gas to be isolated by layering in exhaust, will not directly be contacted with catalyst, and has portion gas without contacting catalyst
Processing is discharged, and the pollutant concentration being integrally vented is made to be difficult to further reduce, becomes the technical bottleneck of gas exhaust treatment.
Utility model content
In view of this, the one of which purpose of the utility model is being sent out in engine exhaust being reduced or avoided in catalyst device
The chance of generating layer flow phenomenon, to the pollutant concentration of engine exhaust to be reduced.
In order to reach above and other purpose, the utility model provides a kind of diesel motor black-smoke purifier, including a chamber
Body, multiple blocker plates and multiple catalyst grains.Cavity have an air inlet, an exhaust outlet and an internal chamber, the air inlet and
The exhaust outlet is connected via the internal chamber, which has an axial road that the exhaust outlet is extended to by the air inlet
Footpath.Those blocker plates are fixed on the cavity and in the internal chambers, those blocker plates are distributed along the axial path, along the axis
It is observed to path, those blocker plates completely cover the internal chamber thereafter.Those catalyst grains be filled in the internal chamber and
At least filling is located therein between two blocker plates.
In order to reach above and other purpose, the utility model also provides a kind of diesel motor black-smoke purifier, including one
Cavity, a blocker plate and multiple catalyst grains.Cavity have an air inlet, an exhaust outlet and an internal chamber, the air inlet and
The exhaust outlet is connected via the internal chamber, which has an axial road that the exhaust outlet is extended to by the air inlet
Footpath.The blocker plate is fixed on the cavity and in the internal chamber, is observed along the axial path, which locally covers it
The internal chamber afterwards.Those catalyst grains are filled in the internal chamber and the blocker plate is surrounded at least filling, along the axial direction road
Footpath is observed, which covers the internal chamber thereafter with those catalyst grains jointly.
In order to reach above and other purpose, the utility model also provides a kind of diesel motor black-smoke purifier, including one
Cavity, multiple blocker plates and multiple catalyst grains.Cavity has an air inlet, an exhaust outlet and an internal chamber, the air inlet
It is connected with the exhaust outlet via the internal chamber, which has an axial direction that the exhaust outlet is extended to by the air inlet
Path.Those blocker plates are fixed on the cavity and in the internal chambers, those blocker plates are distributed along the axial path.Those
Catalyst grains are filled in the internal chamber and at least filling is located therein between two blocker plates, are observed along the axial path, those
Blocker plate covers the internal chamber thereafter with those catalyst grains jointly.
Based on above-mentioned design, the diesel motor black-smoke purifier of the utility model can utilize internal blocker plate to stop gas
Stream, makes air-flow turn to, push in internal chamber or impinging one another, and disturbance is generated to air-flow, and then improves pollutant in air-flow
The chance contacted with catalyst grains is reduced or avoided air-flow and laminar flow phenomenon occurs and directly take pollutant out of, reduces exhaust
Pollutant concentration improves the processing capacity of diesel motor black-smoke purifier.
The specific embodiment that is related on the utility model and it is other the advantages of and effect, cooperation schema is described as follows.
Description of the drawings
It in order to illustrate the technical solutions in the embodiments of the present application or in the prior art more clearly, below will be to embodiment or existing
There is attached drawing needed in technology description to be briefly described, it should be apparent that, the accompanying drawings in the following description is only this
Some embodiments described in application, for those of ordinary skill in the art, without creative efforts,
It can also be obtained according to these attached drawings other attached drawings.
Fig. 1 is the side schematic view of the utility model first embodiment diesel motor black-smoke purifier；
Fig. 2 is the A-A sectional views of Fig. 1；
Fig. 3 is the side schematic view of another embodiment cavity of the utility model；
Fig. 4 is the side schematic view of the utility model second embodiment diesel motor black-smoke purifier；
Fig. 5 is the B-B sectional views of Fig. 4；
Fig. 6 is the sectional view of the utility model 3rd embodiment；
Fig. 7 is the side schematic view of the utility model fourth embodiment diesel motor black-smoke purifier.
Symbol description
X：Axial path 10：Cavity
11：Air inlet 12：Exhaust outlet
13：Internal chamber
21、22、23、24、25、26、27、28、29：Blocker plate
30：Catalyst grains 40：Preprocessing layer
50：Post-process layer 60：Heater
70：Differential manometer 80：Oxygen sensor
91、92：Thermometer
Specific embodiment
The present embodiment provides a kind of diesel motor black-smoke purifiers, are used for being connected to diesel motor, by diesel motor
Exhaust import, the pollutants such as black smoke that can be in purification of diesel engine exhaust.It please refers to Fig.1 and Fig. 2, the diesel oil of the present embodiment draws
Holding up black-smoke purifier includes a cavity 10, multiple blocker plates 21,22,23, multiple catalyst grains 30, preprocessing layer 40, post processing
Layer 50, heater 60, differential manometer 70, oxygen sensor 80 and thermometer 91,92.
There is the cavity 10 air inlet 11, an exhaust outlet 12 and an internal chamber 13, air inlet 11 to be passed through with exhaust outlet 12
It is connected by internal chamber 13, makes gas that can be entered by air inlet 11, after flowing through internal chamber 13, then is discharged by exhaust outlet 12.
Internal chamber 13 has an axial path x that exhaust outlet 12 is extended to by air inlet 11, and in the present embodiment, cavity 10 is uniform
Thin-wall shell, and cavity 10 and internal chamber 13 are generally cylindrical, therefore axial path x is just in a straight line and positioned at cavity
10 and internal chamber 13 the axis of centres it is online.It please refers to Fig.3, in another possible embodiment of the utility model, works as inner chamber
When the extension of room 13 is in bending, axial path x is also bent with internal chamber 13.It please refers to Fig.1 and Fig. 2, to make by air inlet 11
Gas energy long period of entrance is detained in cavity, improves the reaction time of catalyst, internal chamber 13 and cavity 10 can in into
Expand caliber at the downstream of gas port 11, and caliber is reduced again in the upstream end of exhaust outlet 12, gas is made to be flowed in internal chamber 13
The flow velocity reduction when sectional area increases when dynamic.
Those blocker plates 21,22,23 are fixed in cavity 10 and internally positioned chamber 13, and path x is arranged blocker plate vertically
Column distribution, as shown in Fig. 2, path x is observed vertically, those blocker plates 21,22 completely cover the internal chamber 13 thereafter, institute
The internal chamber 13 of masking thereafter is stated, refers to path x observations vertically, the adjacent retardance of the external form profile of blocker plate 21 and its rear
The external form profile of plate 22 can cover whole face domains of internal chamber 13 together, and cannot its visible directly rear internal chamber 13
With exhaust outlet 12, in the present embodiment, adjacent blocker plate 21, the 22 not only internal chamber 13 of common masking thereafter, and blocking
Plate 21,22 has the overlapping of partial face domain when path x vertically is observed；It please refers to Fig.1, in addition two adjacent blocker plates 22,23 are same
The internal chamber 13 of the sample complete maskings of path x vertically thereafter, and path x observations vertically have partial face domain to overlap each other,
In, solid imperforate plate body, such as metallic plate can be used in blocker plate 21,22,23, however uses net in blocker plate 21,22,23
Plate or other multiple hole plate bodys, such as Metal-Piercing plate or honeycomb multicellular hole plate, also fall within feasible.In the present embodiment, it is each
Blocker plate 21,22,23 is parallel to each other, and is approximately perpendicular to axial path x, is relatively easy to consolidate blocker plate 21,22,23 when production
Due to cavity 10, in the other possible embodiments of the utility model, each blocker plate can also lean forward or hypsokinesis is set, and make resistance
Stagnant plate favours axial path x but is not parallel to axial path x, can the flow path of gas thereby be changed into other forms.
Those catalyst grains 30 are filled in the internal chamber 13, and are filled between blocker plate 21,22,23 therein, compared with
Good person, catalyst grains 30 surround those blocker plates 21,22,23 and are filled in the upstream side of blocker plate 21 and blocker plate 23 simultaneously
Downstream side.Those catalyst grains 30 are in metal oxide particle base material such as titanium dioxide, aluminium oxide or zirconium oxide or pottery
Porcelain particulate substrate covering surface catalyst material and obtain, preferably, metal oxide particle base material can also be adopted with ceramic particle base material
With porous particles, specific grain shape has spherical shape, olive shape, glue due to the processing procedure difference of metal oxide or ceramic particle
The possibility of the various shapes such as scrotiform, cube, cuboid or other polyhedrons.Catalyst material can be platinum, porpezite, rhodita (-te)
Noble metals or other base metal catalyst are waited, under without considering the exceptional situation of cost, catalyst grains can not also use base material
And it is directly made with catalyst material.It also can be in all or part of resistance by those blocker plates 21,22,23 that catalyst grains 30 are surrounded
Stagnant plate surface coating catalyst material can be purified by improving the surface area of catalyst material to further improve diesel motor black smoke
The gas exhaust treatment ability of device.
The preprocessing layer 40 obtains for through hole substrate surface coating catalyst material, this through hole base material is through type catalyst
Carrier may be specifically metal mesh, honeycomb metal or honeycomb ceramics, and circulate for gas, the preprocessing layer 40
The upstream side of catalyst grains 30 and blocker plate 21 is arranged at, between catalyst grains 30 and air inlet 11, gas is by air inlet
After 11 enter, catalyst grains 30 can be flowed to via preprocessing layer 40.
The post processing layer 50 obtains for through hole substrate surface coating catalyst, this through hole base material may be compared to preceding place
Manage layer 40 through hole base material have more pore mesh or more highdensity metal mesh, honeycomb metal or honeycomb ceramics or
It may be filter-type honeycomb ceramics, make the post processing layer 50 and equally circulate for gas, however thinner hole mesh or higher close
The resistance for causing air flow through post processing layer 50 is more than resistance of the air stream through preprocessing layer 40 by degree.The post processing layer 50 is arranged at
The downstream side of catalyst grains 30 and blocker plate 23, between catalyst grains 30 and exhaust outlet 12, gas flows through catalyst grains 30
After blocker plate 21,22,23, exhaust outlet 12 can be flowed to via post processing layer 50.
The heater 60 is arranged at the upstream side of blocker plate 21 and is surrounded by catalyst grains 30, and heater 60 can be electricity
Resistive electric heater or other electric heaters, the heater 60 are thermally contacted with being closer to the part catalyst grains of upstream side, can controlled
It heats and improves surrounding and be closer to the air of upstream side or the temperature of catalyst grains 30, in another possible implementation of the utility model
In example, heater, which can also change, is arranged in preprocessing layer 40 at closer catalyst grains 30 or extends preprocessing layer 40 with touching
It is surrounded simultaneously by preprocessing layer 40 with catalyst grains 30 between matchmaker's particle 30, can equally heat and improve air or partly touch
The temperature of matchmaker's particle.
The differential manometer 70 is connected to the upstream of preprocessing layer 40 and post-processes the downstream of layer 50, uses detecting preprocessing layer
Gas pressure difference between 40 upstream and the downstream for post-processing layer 50, when the reading of differential manometer 70 is higher than a predetermined value,
Display and is subject to the pollutant of engine exhaust black smoke to be blocked at catalyst grains 30 around blocker plate 21, for example, microgranular carbon particle or
Hydrocarbon, controllable heater 60 heat, and the pollutant between catalyst grains 30 is made to be aoxidized and be changed by high temperature action
It is discharged after gas.
Oxygen sensor 80 is connected to the upstream of preprocessing layer 40, uses the oxygen-containing of the gas that detecting is entered by air inlet 11
Amount can introduce air when oxygen content is too low by the external world, avoid oxygen content deficiency inside diesel motor black-smoke purifier and cannot
Suitably pollutant is aoxidized.
Thermometer 91,92 be connected to preprocessing layer 40 upstream and post-process layer 50 downstream, use detect into
The temperature of gas port 11 and exhaust outlet 12 grasps the operative scenario of diesel motor black-smoke purifier.When 11 temperature of air inlet is relatively low,
Also heater 60 can control to heat, to improve the temperature of gas, maintains the efficiency of catalyst reaction.
Using above-described embodiment, diesel motor black-smoke purifier is mountable in engine outlet exhaust pipe or tail end muffler
In, engine exhaust can be received and the black smoke in engine exhaust is purified in a manner of catalytic converting.Wherein, when engine exhaust is by air inlet
After mouthfuls 11 enter, for gas stream through preprocessing layer 40, the catalyst of preprocessing layer 40 can aoxidize hydrocarbon in engine exhaust, one
Carbonoxide, nitrogen oxides reduction, and improve gas temperature.Then, gas is touched by downward downstream and by catalyst grains 30
The catalyst on 30 surface of matchmaker's particle can further pollutants such as black smoke in oxidizing gas, wherein, pass through catalyst grains 30 in gas
When, it will it is subject to the obstruction of blocker plate 21,22,23, prevents the path that gas flows from being consistent with axial path x, and can meets with
It bends for several times, to bypass the path that blocker plate 21,22,23 is stopped, the pollutants such as black smoke in air-flow can be further with touching
Matchmaker's particle 30 contacts, and is aoxidized pollutant using catalyst grains 30.Then, the post-treated layer 50 of gas stream, post processing layer 50 can
Using the honeycomb of thinner hole mesh or filter-type, exhaust is handled with catalyst again, reduces the probability of pollutant leakage.
In summary content, the present embodiment sets multiple blocker plates in diesel motor black-smoke purifier, using retardance
Plate stops flow path of the gas in internal chamber, makes the flow path of gas that bending, disturbance occur, make the flowing of gas by
To interference, the phenomenon that air-flow occurs laminar flow and directs out discharge can be avoided or reduced, by the way that air-flow is disturbed to make its bending with disturbing
Dynamic, the pollutants such as black smoke in air-flow can be contacted fully with catalyst grains, improve whole diesel motor black-smoke purifier to dirt
Contaminate the processing capacity of object.
Further, since blocker plate stops flow path of the gas in internal chamber, the flow path generation for making gas is curved
Folding, the flow path for making gas is increased, and improves chance and time that gas is contacted with catalyst grains, pollutant is made to have more
Chance contacts catalyst grains with the time, can improve processing capacity of the whole diesel motor black-smoke purifier to pollutant.
Please refer to Fig.4 structure and figure for the utility model second embodiment, wherein diesel motor black-smoke purifier with Fig. 5
1 and first embodiment shown in Fig. 2 it is roughly the same, identical component is indicated with same-sign, however blocker plate 24,
25th, in 26, path x is observed vertically, as shown in figure 5, in the external form profile of two adjacent blocker plates 24,25 be able to cover together
Whole face domains of portion's chamber 13, and do not overlap each other on axial path x.In this embodiment, gas is in chamber 13
Flow path is similarly subjected to the stop of blocker plate 24,25,26 and bends, and equally can provide better the processing energy of pollutant
Power.
Fig. 6 be refer to as the utility model 3rd embodiment, structure and Fig. 4 the and Fig. 5 institutes of diesel motor black-smoke purifier
The second embodiment shown is roughly the same, and identical component is indicated with same-sign, however for purposes of illustration only, omits wherein
Catalyst grains do not illustrated.In 3rd embodiment, path is observed vertically, and the external form profile of blocker plate 27,28 does not hide
Whole face domains of internal chamber 13 are covered, and only cover the part face domain of internal chamber thereafter, possibility can be by blocker plate 27,28 not
The exhaust outlet 12 at rear is seen in the region of masking, wherein catalyst grains can be filled by not covering the region of its internal chamber, along axis
It is observed to path, blocker plate 27,28 and internal chamber of the catalyst grains by common masking thereafter.In this embodiment, in chamber
Although have regional area can supplied gas path still blocks part area by air inlets flow to exhaust outlet, blocker plate vertically
The air-flow in domain will so be blocked pushing each other with the air-flow not being blocked in guidance cavity room, collide, equally air-flow can be produced
Raw disturbance, reduces the phenomenon that air-flow occurs laminar flow and directs out discharge, and can provide the processing capacity of preferable pollutant.
Above-mentioned first into 3rd embodiment, diesel motor black-smoke purifier includes multiple blocker plates, however, please join
Examine Fig. 7, when diesel motor black-smoke purifier only include a blocker plate 29 when, the single blocker plate cannot vertically path it is complete
The chamber of masking thereafter, but the blocker plate can cover chamber thereafter jointly with catalyst grains, can equally blocker plate be utilized to hinder
The air-flow of regional area is kept off, the air-flow for making the air-flow being blocked and not being blocked occurs to push, collide, and can equally reduce air-flow
Generation laminar flow and the phenomenon that direct out discharge, and the processing capacity of preferable pollutant can be provided.
In summary embodiment, the utility model diesel motor black-smoke purifier can utilize blocker plate to stop inside cavity
Air-flow disturbs air-flow, avoids air-flow that the phenomenon that laminar flow directs out discharge occurs, and pollutant is reduced or avoided without place
It manages and discharges, reduce the pollutant concentration in gas, the processing capacity to pollutants such as black smokes can be promoted.
Secondly, blocker plate in the utility model can extend air-flow in the cavity in the case of appropriate arranged distribution
Flow path, and then improve the chance that is contacted with catalyst grains of pollutant in air-flow, be reduced or avoided pollutant it is unprocessed and
Discharge further improves the processing capacity of pollutant.
Although the utility model is disclosed as above by the above embodiments, so it is not limited to the utility model,
Those skilled in the art, without departing from the spirit and scope of the utility model, when can make a little change and retouch, therefore this
The scope of patent protection of utility model must be regarded subject to claims hereof institute defender.
Claims (16)
1. a kind of diesel motor black-smoke purifier, which is characterized in that including：
One cavity has an air inlet, an exhaust outlet and an internal chamber, and the air inlet is with the exhaust outlet via the internal chamber
It is connected, which has an axial path that the exhaust outlet is extended to by the air inlet；
Multiple blocker plates, those blocker plates are fixed on the cavity and in the internal chambers, those blocker plates are along the axial direction road
Footpath is distributed, and is observed along the axial path, those blocker plates completely cover the internal chamber thereafter；
Multiple catalyst grains, are filled in the internal chamber and at least filling is located therein between two blocker plates.
2. diesel motor black-smoke purifier as described in claim 1, which is characterized in that those catalyst grains are filled in inside this
Chamber and surround those blocker plates.
3. diesel motor black-smoke purifier as described in claim 1, which is characterized in that those blocker plates are approximately perpendicular to the axis
To path.
4. diesel motor black-smoke purifier as described in claim 1, which is characterized in that observed along the axial path, wherein two
The adjacent blocker plate is locally overlapped.
5. diesel motor black-smoke purifier as described in claim 1, which is characterized in that the quantity of those blocker plates for three with
On, it is observed along the axial path, every two adjacent blocker plates completely cover the internal chamber thereafter.
6. a kind of diesel motor black-smoke purifier, which is characterized in that including：
One cavity has an air inlet, an exhaust outlet and an internal chamber, and the air inlet is with the exhaust outlet via the internal chamber
It is connected, which has an axial path that the exhaust outlet is extended to by the air inlet；
One blocker plate, the blocker plate are fixed on the cavity and in the internal chambers, observed along the axial path, the blocker plate
The internal chamber of local masking thereafter；
Multiple catalyst grains are filled in the internal chamber, are observed along the axial path, the blocker plate and those catalyst grains are common
The internal chamber of masking thereafter.
7. diesel motor black-smoke purifier as claimed in claim 6, which is characterized in that further include another blocker plate, two resistance
Stagnant plate is arranged along the axial path.
8. diesel motor black-smoke purifier as claimed in claim 6, which is characterized in that the blocker plate is approximately perpendicular to the axial direction
Path.
9. a kind of diesel motor black-smoke purifier, which is characterized in that including：
One cavity has an air inlet, an exhaust outlet and an internal chamber, and the air inlet is with the exhaust outlet via the internal chamber
It is connected, which has an axial path that the exhaust outlet is extended to by the air inlet；
Multiple blocker plates, those blocker plates are fixed on the cavity and in the internal chambers, those blocker plates are along the axial direction road
Footpath is distributed；
Multiple catalyst grains, are filled in the internal chamber and at least filling is located therein between two blocker plates, along the axial path
Observation, those blocker plates cover the internal chamber thereafter with those catalyst grains jointly.
10. diesel motor black-smoke purifier as claimed in claim 9, which is characterized in that it is interior that those catalyst grains are filled in this
Portion's chamber and surround those blocker plates.
11. diesel motor black-smoke purifier as claimed in claim 9, which is characterized in that observed along the axial path, wherein two
The adjacent blocker plate is locally overlapped.
12. diesel motor black-smoke purifier as claimed in claim 9, which is characterized in that those blocker plates are approximately perpendicular to this
Axial path.
13. the diesel motor black-smoke purifier as any one of claim 1 to 12, which is characterized in that further include a table
Face has the preprocessing layer of catalyst, which is located between those catalyst grains and the air inlet, and gas can be by air inlet
Those catalyst grains are flowed to via the preprocessing layer.
14. diesel motor black-smoke purifier as claimed in claim 13, which is characterized in that further including a surface has catalyst
Post-process layer, which is located between those catalyst grains and the exhaust outlet, the post processing layer can supplied gas touched by those
Matchmaker's particle via the post processing laminar flow to the exhaust outlet, wherein, the resistance that air flows through the post processing layer is flowed through more than air
The resistance of the preprocessing layer.
15. the diesel motor black-smoke purifier as any one of claim 1 to 12, which is characterized in that further include one and add
Hot device, the heater are thermally contacted with being closer to the catalyst grains of air inlet side in those catalyst grains.
16. diesel motor black-smoke purifier as claimed in claim 15, which is characterized in that further include a differential manometer, the pressure difference
Meter is connected to the air inlet and the exhaust outlet and can detect the pressure differential of the air inlet and the exhaust outlet, is more than in the pressure differential
During one predetermined value, start the heater.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201721462019.3U CN207420670U (en) | 2017-11-06 | 2017-11-06 | Diesel motor black-smoke purifier |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201721462019.3U CN207420670U (en) | 2017-11-06 | 2017-11-06 | Diesel motor black-smoke purifier |
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| CN207420670U true CN207420670U (en) | 2018-05-29 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109356686A (en) * | 2018-11-05 | 2019-02-19 | 卢宝良 | Diesel motor exhaust black-smoke purifier |
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2017
- 2017-11-06 CN CN201721462019.3U patent/CN207420670U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109356686A (en) * | 2018-11-05 | 2019-02-19 | 卢宝良 | Diesel motor exhaust black-smoke purifier |
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