CN213510811U - Separating mixer with heat insulation structure - Google Patents
Separating mixer with heat insulation structure Download PDFInfo
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- CN213510811U CN213510811U CN202022832966.5U CN202022832966U CN213510811U CN 213510811 U CN213510811 U CN 213510811U CN 202022832966 U CN202022832966 U CN 202022832966U CN 213510811 U CN213510811 U CN 213510811U
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Abstract
The utility model discloses a separating mixer with a heat insulation structure, wherein a front baffle is vertically arranged on the lower part of the inner wall surface at the front end of a shell, a rear baffle is vertically arranged on the inner wall surface at the rear end, and a baffle and a lower baffle are sequentially arranged between the front baffle and the rear baffle along the axial direction from top to bottom; the front baffle, the rear baffle, the two clapboards and the lower baffle divide the inner cavity of the shell into an air inlet cavity, an air outlet cavity and a heat insulation cavity. The utility model discloses a preceding baffle, backplate, lower baffle's board-like partition structure falls into the inside cavity of shell into air inlet chamber, goes out the air cavity, thermal-insulated chamber, and board-like simple structure does not have obvious throttle region between each board, and airflow pressure loss is little, and flat structure occupation space is little moreover, can remain more spaces in the shell and be used for the air current distribution, more is favorable to the tissue of air current, and space utilization is high.
Description
Technical Field
The utility model belongs to the technical field of the engine exhaust aftertreatment technique and specifically relates to a take cellular-type blender of thermal-insulated structure.
Background
At present, in an engine exhaust gas after-treatment system, a Selective Catalytic Reduction (SCR) technology is generally adopted to carry out after-treatment on the exhaust gas emission of an engine; in order to ensure that urea liquid drops can be fully and uniformly mixed with the tail gas of the diesel engine in the aftertreatment system, a mixer is added in the aftertreatment system, urea aqueous solution is sprayed into the mixer, and the urea aqueous solution is heated by the tail gas and decomposed into ammonia (NH)3) Ammonia gas (NH) under the action of catalyst3) Removing Nitrogen Oxides (NO) from exhaust gasesX) Reduction to harmless nitrogen (N)2) And water (H)2O), and finally discharged from the tail gas pipe, thereby achieving the purpose of reducing the emission.
The mixer is limited in space for arranging the mixer due to the limited arrangement space of the engine room and the whole vehicle and strict requirement on the space size of the aftertreatment system; in order to achieve the purpose of mixing urea droplets and tail gas flow in a limited space, a throttling structure is usually designed in the mixer, and the throttling structure increases the turbulence through local flow velocity, so that the urea droplets are crushed, and the purposes of evaporating the urea droplets and mixing the urea droplets with the tail gas flow are achieved. However, the existing mixer with the throttling structure has low space utilization rate, large pressure loss of the mixer and great influence on the performance of the engine.
SUMMERY OF THE UTILITY MODEL
The applicant aims at the defects of low space utilization rate, high pressure loss and large influence on the performance of the engine of the mixer of the existing tail gas aftertreatment system, and provides a partition type mixer with a heat insulation structure, which is reasonable in structure, high in space utilization rate, low in pressure loss and capable of ensuring the performance of the engine.
The utility model discloses the technical scheme who adopts as follows:
a separating mixer with a heat insulation structure is characterized in that a front baffle is vertically arranged on the lower portion of the inner wall surface of the front end of a shell, an air inlet is formed above the front baffle, and a plurality of first through holes are formed in the lower plate surface of the front baffle; a rear baffle is vertically arranged on the inner wall surface of the rear end of the shell, the outer contour dimension of the rear baffle is matched with the inner contour dimension of the corresponding part of the shell, an air outlet and a plurality of second through holes are formed in the lower half plate surface of the rear baffle, and the second through holes are positioned on the lower side of the air outlet; a baffle plate and a lower baffle plate are sequentially arranged between the front baffle plate and the rear baffle plate from top to bottom along the axial direction; the top ends of the left part and the right part of the front baffle are respectively provided with a clapboard along the axial direction, and an air inlet channel is formed between the two clapboards; the front baffle, the rear baffle, the two clapboards and the lower baffle divide the inner cavity of the shell into an air inlet cavity, an air outlet cavity and a heat insulation cavity, the air inlet cavity and the air outlet cavity are communicated through an air inlet channel, and the heat insulation cavity is communicated with a plurality of first through holes of the front baffle and a plurality of second through holes of the rear baffle.
As a further improvement of the above technical solution:
the partition board is L-shaped and is provided with a transverse board part and a vertical board part; the two clapboards are oppositely arranged, and respective vertical boards are positioned at the inner sides.
The vertical plate parts of the two partition plates are vertically positioned in the air inlet cavity, the air inlet cavity is divided into a left air inlet area, a middle air inlet area and a right air inlet area, and the air inlet channel is positioned in the middle air inlet area; a plurality of third through holes are formed in the plate surface of the vertical plate part, blades are arranged on the third through holes, and the blades are obliquely and downwards opened towards the air inlet channel; the third through hole at the lowermost end of the vertical plate portion is not provided with a blade.
The air outlet of the rear baffle is semi-annular, and a shielding part protruding downwards is formed on the lower plate surface.
The lower baffle is a concave arc-shaped plate, and the rear end part of the lower baffle is clamped at the lower edge of the air outlet of the rear baffle.
The outline size of the outer side surface of the lower baffle plate is matched with the outline size of the lower side edge of the air outlet.
A first pore plate and a second pore plate are arranged in the air inlet channel from top to bottom and are positioned between the partition plate and the lower baffle plate; the first pore plate is provided with a plurality of fourth through holes, and the second pore plate is provided with a plurality of fifth through holes.
The first pore plate and the second pore plate are concave arc plates; the rear end part of the second pore plate is clamped at the upper edge of the air outlet of the rear baffle plate, and the contour size of the upper side surface of the second pore plate is matched with the contour size of the upper side edge of the air outlet.
A nozzle seat is arranged on the shell and right opposite to the first air inlet channel; the periphery of the nozzle seat at the air inlet side is provided with a baffle plate; the shell is also provided with a temperature sensor seat and a pressure sensor seat.
A guide plate is arranged in the shell and positioned at the rear side of the rear baffle, and a plurality of sixth through holes are formed in the guide plate.
The utility model has the advantages as follows:
the utility model discloses a preceding baffle, backplate, lower baffle's board-like partition structure falls into the inside cavity of shell into air inlet chamber, goes out the air cavity, thermal-insulated chamber, and board-like simple structure does not have obvious throttle region between each board, and airflow pressure loss is little, and flat structure occupation space is little moreover, can remain more spaces in the shell and be used for the air current distribution, more is favorable to the tissue of air current, and space utilization is high. The first through holes of the front baffle and the second through holes of the rear baffle are communicated with the heat insulation cavity, tail gas flows flow into the heat insulation cavity from the first through holes, the front baffle, the rear baffle, the lower baffle and the wall surfaces of the corresponding parts of the shell are heated, and urea crystallization caused by the fact that the temperature of each wall surface is too low is avoided; the air current in the thermal-insulated intracavity flows from a plurality of second through-holes, can avoid forming the dead zone that flows between backplate bottom and the guide plate, has avoided the formation and the pile up of urea crystallization.
The blades of the vertical plate part can guide the air flow of the left air inlet area and the right air inlet area to change the direction and flow into the middle air inlet area along the obliquely downward direction, and the air flow is mixed with the directly entering air flow of the middle air inlet area, so that the uniformity of air flow mixing is higher, the urea liquid drop can be more favorably subjected to full mixing reaction, and the urea liquid drop is fully atomized, evaporated and pyrolyzed; the third through hole at the lowest end is not provided with a blade, so that the air input on two sides of the bottom of the middle air inlet area can be increased, the two ends of the first pore plate can be heated, and urea liquid drops are prevented from forming urea crystals at the two ends of the first pore plate.
The utility model discloses a first orifice plate can break up the urea liquid drop of urea nozzle injection breakage for less liquid drop, does benefit to urea liquid drop atomization evaporation and pyrolysis, and the second orifice plate further breaks up the breakage into littleer liquid drop in the future urea liquid drop, more does benefit to abundant urea liquid drop atomization evaporation and pyrolysis. The first pore plate and the second pore plate are concave downwards, so that the movement track length of urea liquid drops is increased, the urea liquid drops and tail gas airflow are more favorably and fully and uniformly mixed, and the urea liquid drops are fully pyrolyzed.
The utility model discloses a shielding plate setting is located the periphery of one side of admitting air at the nozzle holder, blocks the tail gas air current that gets into, thereby avoids tail gas air current direct-blow urea to spout the ray, blow down the urea liquid drop on the internal face of back shell and form the urea crystallization.
The utility model discloses a set up the guide plate in the shell, after the mixed gas stream that flows out from the air outlet cavity flows through the guide plate, the ascending trend of aggravation air current forms the whirl for mixed gas stream can have longer mixture, pyrolysis route under limited length, and mixed effect is better, and the homogeneity of mixing is higher.
Drawings
Fig. 1 is a perspective view of the present invention.
Fig. 2 is an exploded view of fig. 1.
Fig. 3 is a longitudinal sectional view of fig. 1.
In the figure: 1. a housing; 2. a front baffle; 21. a first through hole; 3. a tailgate; 31. an air outlet; 32. a shielding portion; 33. a second through hole; 4. a partition plate; 41. a lateral plate portion; 42. a vertical plate portion; 421. a third through hole; 422. a blade; 5. a lower baffle plate; 6. a first orifice plate; 61. a fourth via hole; 7. a second orifice plate; 71. a fifth through hole; 8. a baffle; 81. a sixth through hole; 9. an air inlet cavity; 91. a left side intake zone; 92. a middle gas intake zone; 93. a right side intake zone; 10. an air outlet cavity; 11. a nozzle holder; 12. a shielding plate; 13. a temperature sensor seat; 14. a pressure sensor seat; 15. an air intake passage; 16. a heat insulating cavity.
Detailed Description
The following describes embodiments of the present invention with reference to the drawings.
As shown in fig. 1, 2 and 3, a semicircular front baffle 2 is vertically arranged along the radial direction at the lower part of the inner wall surface of the front end of a cylindrical shell 1, the height of the front baffle 2 is approximately equal to half of the inner diameter of the shell 1, an air inlet is formed in the shell 1 and above the front baffle 2, a plurality of first through holes 21 are formed in the lower plate surface of the front baffle 2, and the first through holes 21 are long-strip arc waist-shaped holes. The rear end inner wall of the shell 1 is vertically provided with a circular rear baffle 3 along the radial direction, the outer contour dimension of the rear baffle 3 is matched with the inner contour dimension of the corresponding part of the shell 1, a semi-annular gas outlet 31 is formed on the lower half plate surface of the rear baffle 3, a shielding part 32 protruding downwards is formed on the lower half plate surface, a plurality of second through holes 33 are formed in the lower side, located on the gas outlet 31, of the lower half plate surface of the rear baffle 3, and the second through holes 33 are strip-shaped arc waist-shaped holes. A partition plate 4, a first pore plate 6, a second pore plate 7 and a lower baffle plate 5 are sequentially arranged between the front baffle plate 2 and the rear baffle plate 3 along the axial direction from top to bottom, the top ends of the left part and the right part of the front baffle plate 2 are respectively provided with an L-shaped partition plate 4 along the axial direction, the partition plate 4 is provided with a transverse plate part 41 and a vertical plate part 42, the left partition plate 4 and the right partition plate 4 are oppositely arranged, and the respective vertical plate parts 42 are positioned at the inner sides; the vertical plates 42 of the left and right separators 4 are spaced apart from each other by a predetermined distance, and the air intake passage 15 is formed by a gap between the vertical plates. The front baffle 2, the rear baffle 3, the transverse plate parts 41 of the two partition plates 4 and the lower baffle 5 divide the inner cavity of the shell 1 into an air inlet cavity 9, an air outlet cavity 10 and a heat insulation cavity 16; as shown in fig. 3, the intake chamber 9 is a cavity inside the casing 1 between the upper side of the horizontal plate portion 41 of the partition plate 4 and the front side of the tailgate 3; the air outlet cavity 10 is a cavity inside the shell 1 and positioned between the lower side of the transverse plate part 41 of the partition plate 4, the rear side of the front baffle plate 2, the front side of the rear baffle plate 3 and the upper side of the lower baffle plate 5; the heat insulation cavity 16 is a cavity inside the shell 1 and positioned between the rear side of the front baffle 2, the front side of the rear baffle 3 and the lower side of the lower baffle 5; the air inlet cavity 9 and the air outlet cavity 10 are communicated through an air inlet channel 15. The utility model discloses a preceding baffle 2, baffle 4, backplate 3, lower baffle 5's board-like partition structure falls into air inlet chamber 9, play air cavity 10, thermal-insulated chamber 16 with shell 1's inside cavity, and board-like simple structure does not have obvious throttle region between each board, and airflow pressure loss is little, and flat structure occupation space is little moreover, can remain more spaces in the shell 1 and be used for the air current distribution, more is favorable to the tissue of air current, and space utilization is high.
As shown in fig. 2 and 3, the lower baffle 5 is a concave arc plate, the rear end part of the lower baffle is clamped at the lower edge of the air outlet 31 of the rear baffle 3, and the outline size of the outer side surface of the lower baffle 5 is matched with the outline size of the lower side edge of the air outlet 31; the lower baffle 5 is positioned above the plurality of first through holes 21 of the front baffle 2 and the plurality of second through holes 33 of the rear baffle 3, the plurality of first through holes 21 and the plurality of second through holes 33 are communicated with the heat insulation cavity 16, tail gas flows flow into the heat insulation cavity 16 from the plurality of first through holes 21, the front baffle 2, the rear baffle 3, the lower baffle 5 and the wall surface of the corresponding part of the shell 1 are heated, and urea crystallization caused by too low temperature of each wall surface is avoided; the air current in the heat insulation cavity 16 flows out from the plurality of second through holes 33, so that a flow dead zone can be prevented from being formed between the bottom of the rear baffle plate 3 and the guide plate 8, and urea crystals are prevented from being formed and accumulated.
As shown in fig. 1, 2 and 3, the vertical plate parts 42 of the two partition plates 4 are vertically positioned in the air inlet cavity 9, and divide the air inlet cavity 9 into three air inlet areas: a left side intake area 91, a middle intake area 92 and a right side intake area 93, the intake passage 15 being located in the middle intake area 92; the plate surface of the vertical plate part 42 is provided with a plurality of square third through holes 421, except for the third through hole 421 at the lowest end, the other third through holes 421 are all provided with blades 422, the blades 422 are obliquely opened downwards towards the air inlet channel 15, can guide the air flows of the left air inlet area 91 and the right air inlet area 93 to change directions, flow into the middle air inlet area 92 along the oblique downwards direction, and are mixed with the directly entering air flow of the middle air inlet area 92, the air flow mixing uniformity is higher, and the urea droplets are more favorably subjected to full mixing reaction, so that the urea droplets are fully atomized, evaporated and pyrolyzed; the third through hole 421 at the lowest end is not provided with the blade 422, so that the air inflow at two sides of the bottom of the middle air inlet area 92 can be increased, the two ends of the first pore plate 6 can be heated, and urea liquid drops are prevented from forming urea crystals at two ends of the first pore plate 6.
As shown in fig. 1 and 3, a nozzle holder 11 is arranged on the housing 1, the nozzle holder 11 faces the air inlet passage 15, and a urea nozzle is arranged on the nozzle holder 11 and can spray urea droplets toward the air inlet passage 15; a U-shaped baffle plate 12 with an opening at one end and a closed end is fixedly arranged on the inner wall surface of the shell 1, the closed end is positioned on the air inlet side, the baffle plate 12 shields the periphery of a urea nozzle on the nozzle seat 11, namely, the baffle plate 12 is arranged on the periphery of the nozzle seat 11 positioned on the air inlet side, and shields the entering tail gas flow, so that the tail gas flow is prevented from directly blowing urea spray rays, and urea liquid drops are blown onto the inner wall surface of the rear shell 1 to form urea crystals; the shell 1 is also provided with a temperature sensor seat 13 and a pressure sensor seat 14 which are used for installing a temperature sensor and a pressure sensor and monitoring the temperature and the air pressure of the air flow in the shell 1.
As shown in fig. 2 and 3, the first orifice plate 6 and the second orifice plate 7 are located in the air inlet passage 15, and the first orifice plate 6 and the second orifice plate 7 face the nozzle holder 11; the first pore plate 6 is provided with a plurality of fourth through holes 61, and the second pore plate 7 is provided with a plurality of fifth through holes 71; the first pore plate 6 can break up urea liquid drops sprayed by the urea nozzle into smaller liquid drops, so that the urea liquid drops are favorably atomized, evaporated and pyrolyzed, and the second pore plate 7 further breaks up the urea liquid drops into smaller liquid drops, so that the urea liquid drops are favorably fully atomized, evaporated and pyrolyzed; first orifice plate 6, second orifice plate 7 are recessed arc, have increased the movement track length of urea liquid drop, more do benefit to urea liquid drop and abundant, the homogeneous mixing of tail gas air current for the abundant pyrolysis of urea liquid drop. The rear end part of the second orifice plate 7 is clamped at the upper edge of the air outlet 31 of the rear baffle plate 3, and the outline size of the upper side surface of the second orifice plate 7 is matched with the outline size of the upper side edge of the air outlet 31.
As shown in fig. 2 and fig. 3, a guide plate 8 is vertically arranged along the radial direction on the lower part of the inner wall surface of the rear end of the housing 1, the guide plate 8 is positioned on the rear side of the rear baffle 3 and has a certain distance with the rear baffle 3, the guide plate 8 is a circular arc-shaped plate with a minor arc, a plurality of sixth through holes 81 are formed in the panel of the guide plate 8, and after the mixed airflow flowing out of the air outlet cavity 10 flows through the guide plate 8, the upward trend of the airflow is intensified, a rotational flow is formed, so that the mixed airflow can have a longer mixing and pyrolysis path under the limited length, the mixing effect is better, and the mixing uniformity is higher.
In actual use, the utility model is arranged between a DPF (particle catcher) component and an SCR component of the tail gas after-treatment system, and urea nozzles in the nozzle seat 11 spray urea liquid drops into the middle air inlet area 92 of the air inlet cavity 9 during working; the tail gas is divided into a left air inlet area 91, a middle air inlet area 92 and a right air inlet area 93 which are respectively input into the left air inlet area 91, the middle air inlet area 92 and the right air inlet area 93 of the air inlet cavity 9 after the direction of the air flow of the left air inlet area 91 and the right air inlet area 93 is changed through the vertical plate part 42 of the partition plate 4, the air flow flows into the middle air inlet area 92 along the downward inclined direction and is mixed with the directly entering air flow of the middle air inlet area 92, the urea liquid drops are atomized, evaporated and pyrolyzed by the mixed air flow in the middle air inlet area 92, the primary decomposition and mixing of the urea liquid drops are completed, the mixed air flow downwards sequentially passes through the first pore plate 6 and the second pore plate 7, and the further decomposition and mixing of the urea liquid drops are completed and then enter the air.
The above description is illustrative of the present invention and is not intended to limit the present invention, and the present invention may be modified in any manner without departing from the spirit of the present invention.
Claims (10)
1. The utility model provides a take cellular-type blender of thermal-insulated structure which characterized in that: a front baffle (2) is vertically arranged on the lower portion of the inner wall surface of the front end of the shell (1), an air inlet is formed above the front baffle (2), and a plurality of first through holes (21) are formed in the lower plate surface of the front baffle (2); a rear baffle (3) is vertically arranged on the inner wall surface of the rear end of the shell (1), the outer contour size of the rear baffle (3) is matched with the inner contour size of the corresponding part of the shell (1), an air outlet (31) and a plurality of second through holes (33) are formed in the lower half plate surface of the rear baffle (3), and the second through holes (33) are positioned on the lower side of the air outlet (31);
a baffle plate (4) and a lower baffle plate (5) are sequentially arranged between the front baffle plate (2) and the rear baffle plate (3) along the axial direction from top to bottom; the top ends of the left part and the right part of the front baffle (2) are respectively provided with a clapboard (4) along the axial direction, and an air inlet channel (15) is formed between the two clapboards (4);
preceding baffle (2), backplate (3), two baffles (4) and baffle (5) down divide into air inlet chamber (9), play air cavity (10) and thermal-insulated chamber (16) with the inside cavity of shell (1), and air inlet chamber (9), play air cavity (10) are through inlet channel (15) intercommunication, and thermal-insulated chamber (16) communicate with a plurality of first through-holes (21) of preceding baffle (2) and a plurality of second through-holes (33) of backplate (3).
2. A divided mixer with insulation as defined in claim 1, wherein: the partition plate (4) is L-shaped and has a horizontal plate part (41) and a vertical plate part (42); the two partitions (4) are arranged opposite to each other with their respective vertical plate portions (42) on the inner side.
3. A divided mixer with insulation according to claim 2, wherein: the vertical plate parts (42) of the two partition plates (4) are vertically positioned in the air inlet cavity (9), the air inlet cavity (9) is divided into a left air inlet area (91), a middle air inlet area (92) and a right air inlet area (93), and the air inlet channel (15) is positioned in the middle air inlet area (92); a plurality of third through holes (421) are formed in the plate surface of the vertical plate part (42), blades (422) are arranged on the third through holes (421), and the blades (422) are obliquely and downwards opened towards the air inlet channel (15); the third through hole 421 at the lowermost end of the vertical plate 42 is not provided with a blade 422.
4. A divided mixer with insulation as defined in claim 1, wherein: the air outlet (31) of the rear baffle (3) is semi-annular, and a shielding part (32) protruding downwards is formed on the lower plate surface.
5. A divided mixer with insulation as defined in claim 1, wherein: the lower baffle (5) is a concave arc-shaped plate, and the rear end part of the lower baffle is clamped at the lower edge of the air outlet (31) of the rear baffle (3).
6. A divided mixer with insulation according to claim 5, wherein: the outline size of the outer side surface of the lower baffle (5) is matched with the outline size of the lower side edge of the air outlet (31).
7. A divided mixer with insulation as defined in claim 1, wherein: a first pore plate (6) and a second pore plate (7) are arranged in the air inlet channel (15) from top to bottom, and the first pore plate (6) and the second pore plate (7) are positioned between the partition plate (4) and the lower baffle plate (5); the first pore plate (6) is provided with a plurality of fourth through holes (61), and the second pore plate (7) is provided with a plurality of fifth through holes (71).
8. A divided mixer with insulation as defined in claim 7 wherein: the first orifice plate (6) and the second orifice plate (7) are concave arc-shaped plates; the rear end part of the second pore plate (7) is clamped at the upper edge of the air outlet (31) of the rear baffle plate (3), and the contour dimension of the upper side surface of the second pore plate (7) is matched with the contour dimension of the upper side edge of the air outlet (31).
9. A divided mixer with insulation as defined in claim 1, wherein: a nozzle seat (11) is arranged on the shell (1) and opposite to the first air inlet channel (15); a shielding plate (12) is arranged on the periphery of the nozzle seat (11) on the air inlet side; the shell (1) is also provided with a temperature sensor seat (13) and a pressure sensor seat (14).
10. A divided mixer with insulation as defined in claim 1, wherein: a guide plate (8) is arranged in the shell (1) and positioned at the rear side of the rear baffle (3), and a plurality of sixth through holes (81) are formed in the guide plate (8).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202022832966.5U CN213510811U (en) | 2020-12-01 | 2020-12-01 | Separating mixer with heat insulation structure |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202022832966.5U CN213510811U (en) | 2020-12-01 | 2020-12-01 | Separating mixer with heat insulation structure |
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| CN213510811U true CN213510811U (en) | 2021-06-22 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202022832966.5U Active CN213510811U (en) | 2020-12-01 | 2020-12-01 | Separating mixer with heat insulation structure |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113404574A (en) * | 2021-07-21 | 2021-09-17 | 无锡威孚力达催化净化器有限责任公司 | Mixer guide plate structure |
| CN114294082A (en) * | 2022-02-07 | 2022-04-08 | 无锡威孚力达催化净化器有限责任公司 | High-efficient blender device of exhaust aftertreatment |
-
2020
- 2020-12-01 CN CN202022832966.5U patent/CN213510811U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113404574A (en) * | 2021-07-21 | 2021-09-17 | 无锡威孚力达催化净化器有限责任公司 | Mixer guide plate structure |
| CN114294082A (en) * | 2022-02-07 | 2022-04-08 | 无锡威孚力达催化净化器有限责任公司 | High-efficient blender device of exhaust aftertreatment |
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