CN202315584U - Dust-removing box and dust-removing system provided with dust-removing box - Google Patents

Dust-removing box and dust-removing system provided with dust-removing box Download PDF

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Publication number
CN202315584U
CN202315584U CN2011205145193U CN201120514519U CN202315584U CN 202315584 U CN202315584 U CN 202315584U CN 2011205145193 U CN2011205145193 U CN 2011205145193U CN 201120514519 U CN201120514519 U CN 201120514519U CN 202315584 U CN202315584 U CN 202315584U
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CN
China
Prior art keywords
dust
casing
cleaning case
air inlet
dust cleaning
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Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
CN2011205145193U
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Chinese (zh)
Inventor
甘新宇
肖庆麟
尹国麟
滕新科
黎山
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Changsha Zoomlion Environmental Industry Co Ltd
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Zoomlion Heavy Industry Science and Technology Co Ltd
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Priority to CN2011205145193U priority Critical patent/CN202315584U/en
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Abstract

The utility model discloses a dust-removing box and a dust-removing system provided with the dust-removing box, which are used for filtering dust-containing air stream. The dust-removing box comprises a box body and an air filtering barrel arranged in the box body, wherein the box body is provided with an air outlet and an air inlet; the dust-containing air stream enters the box body through the air inlet, and is exhausted from the air outlet after being filtered through the air filtering barrel; the air inlet is close to the top of the air filtering barrel; the top of the air filtering barrel is communicated with the air outlet; and the bottom of the air filtering barrel is enclosed. Due to the adoption of a dust-removing way for introducing from an upper side and exhausting from the upper side in the dust-removing box and the dust-removing system provided with the dust-removing box, dust filtered by using the air filtering barrel is prevented from being remixed into the dust-containing air stream while the continuous dust-containing air stream flows inwards from the lower side of the dust-removing box and is filled into the box body.

Description

Dust cleaning case and have the dust pelletizing system of this dust cleaning case
Technical field
The utility model is about a kind of dust pelletizing system, and particularly about a kind of dust cleaning case that dust-contained airflow is filtered and the dust pelletizing system with this dust cleaning case.
Background technology
At present; Domestic dry dust removal sweeping machine generally uses dust cleaning case that dust-contained airflow is carried out dust removal by filtration; Though there is part producer to adopt cloth bag or board-like filter screen as filtering bodies, in use there are defectives such as low, the easy paste bag of cleaning efficiency, so; Adopt cloth bag or board-like filter screen fewer and feweri as the product of dry dust removal, more dry dust removal sweeping machine has adopted the pattern of dust cleaning case dedusting.
Existing dust cleaning case; Though be establish in adopting three filter inflators or in establish four filter inflators; Dust cleaning case is divided into two parts up and down, and casing top is provided with the high pressure dust remover, also has the exhaust outlet of straight-through atmosphere; Lower box is provided with the air inlet of feeding dust-contained airflow and the dust collecting after the filtration, and the filter inflator is between exhaust outlet and air inlet.Dust cleaning case is made and is gone up the thin plates that adopt more, and box house is simple rectangle, establishes skeleton in the part casing and strengthens; Filter inflator symmetric arrangement in the casing.
The casing top and the bottom are isolated basically, but dust-contained airflow gets into from dust cleaning case bottom below, and after filtering the inflator filtration, cleaned air can get into casing top and finally enter atmosphere.Through programme-control, the high pressure dust remover can regularly discharge pressure-air the filter inflator is blown spray, is adsorbed on the dust of filter inflator outer surface with removing; The dust that is eliminated falls into the flue-dust retainer of lower box in the own wt effect, and finally is admitted to dustbin through suction nozzle, and this is an air inlet dedusting pattern of entering the row of going up down.But; There is weak point in this air inlet dedusting method that enters the row of going up down; Dust-contained airflow pours in from dust cleaning case below and is full of box house endlessly; Removed by the pulse ash remover of casing top when the dust of filter on the air cylinder wall, receive the influence of the dust-contained airflow that lower box pours at a high speed, the dust that is eliminated can't successfully fall into the flue-dust retainer of lower box.Though dust-contained airflow is constantly filtered by the filter inflator; Dust is stayed on the filter inflator outer wall; Is removed from the filter air cylinder wall by pulse ash remover again at last, but wherein most of dust constantly stirred in the dust-contained airflow again again, made that the dust concentration in the dust-contained airflow of filtering inflator top remains at a higher state; The dust removal by filtration efficient of filter inflator is unsatisfactory, has reduced the efficient of dry type dust removal by filtration.
The utility model content
The utility model provides a kind of dust cleaning case that can improve efficiency of dust collection.
In addition, be necessary to provide a kind of dust pelletizing system with above-mentioned dust cleaning case.
For reaching above-mentioned advantage; The utility model provides a kind of dust cleaning case; Be used for dust-contained airflow is filtered, comprise casing and the filter inflator that is arranged in the casing, offer exhaust outlet and air inlet on the said casing; Said dust-contained airflow gets in the casing from air inlet, filters the back through the filter inflator and discharges from exhaust outlet; Said air inlet is near the top of said filter inflator, and the top of said filter inflator communicates with said exhaust outlet, the bottom lock of said filter inflator.
In an embodiment of the utility model, be provided with the water conservancy diversion combination in the said casing dust-contained airflow that gets in the said casing is flowed around said filter inflator.
In an embodiment of the utility model, said water conservancy diversion combination comprises the two straight deflectors of being located at the air inlet place, and said two straight deflectors extend to the center of said air inlet.
In an embodiment of the utility model, the quantity of said filter inflator is four, and said water conservancy diversion combination also comprises two arc deflectors of being located at middle part in the casing, and said two arc deflectors are corresponding to respectively two said filter inflators near the air inlet place.
In an embodiment of the utility model, said casing comprises four side panels, and said four side panels adopt hypotenuse to connect.
In an embodiment of the utility model, said air inlet is positioned on one of them said side panel, and it is protruding that the middle inside of its excess-three said side panel forms V-arrangement, and said hypotenuse and said V-arrangement convexity are the part of said water conservancy diversion combination.
In an embodiment of the utility model; Said air inlet is positioned on one of them said side panel; The middle inside that is positioned at the said side panel of said air inlet two sides forms the V-arrangement convexity; Said hypotenuse and said V-arrangement convexity are the part of said water conservancy diversion combination, with said air inlet over against the inboard of said side panel be flat surface.
In an embodiment of the utility model, said two arc deflectors are connected with the said V-arrangement on the said side panel that is positioned at said air inlet two sides is protruding.
In an embodiment of the utility model, said two arc deflectors are connected with the said V-arrangement on the said side panel that is positioned at said air inlet two sides is protruding.
In an embodiment of the utility model, said water conservancy diversion combination also comprises other two arc deflectors of being located at middle part in the casing, and said four arc deflectors join end to end and be corresponding to respectively said four filtration inflators.
In an embodiment of the utility model; The quantity of said filter inflator is four; Said water conservancy diversion combination also comprises the rectangular entity with four end to end arcuate flanks of being located at middle part in the said casing; Said four arcuate flanks are corresponding to respectively said four filter inflators, the cross section of said four arcuate flanks structure that assumes diamond in shape.In an embodiment of the utility model, in the said casing dividing plate is set, said dividing plate is divided into casing top and lower box with casing, and said exhaust outlet is located at said casing top; Said air inlet is located at said lower box, and said dividing plate is provided with and the corresponding through hole in the top of said filter inflator.
In an embodiment of the utility model; Said dust cleaning case also comprises the high pressure dust remover; Said high pressure dust remover is installed on said casing top, and said high pressure dust remover regularly feeds high pressure draught is adsorbed on said filter inflator outer surface with removing dust to the top of said filter inflator at interval.
In an embodiment of the utility model, the bottom of said casing is provided with flue-dust retainer.
The utility model also provides a kind of dust pelletizing system, comprises suction nozzle and dustbin and above-mentioned dust cleaning case, and said suction nozzle is connected with said flue-dust retainer, and the dust of said flue-dust retainer is discharged to dustbin through said suction nozzle.
The beneficial effect of the utility model is; Compare the following dedusting method that advances upward to arrange of prior art; Dust cleaning case of the utility model and the dust pelletizing system with this dust cleaning case are taked the enterprising row's of going up dedusting method; Avoided endlessly dust-contained airflow to pour in and be full of box house from the dust cleaning case below; Prevent to be filtered inflator and filter the dust that gets off and constantly stirred into again in the dust-contained airflow again, reduced the dust concentration in the dust-contained airflow on filter inflator top, thereby improve the dust removal by filtration efficient of filter inflator.
For let the above-mentioned of the utility model and other purpose, feature and advantage can be more obviously understandable, hereinafter is special lifts preferred embodiment, and cooperates appended graphicly, elaborates as follows.
Description of drawings
Fig. 1 is that sketch map is cutd open in the cross section of the dust pelletizing system of the utility model preferred embodiment.
Fig. 2 is first kind of structural representation that dust cleaning case water conservancy diversion shown in Figure 1 makes up.
Fig. 3 is second kind of structural representation that dust cleaning case water conservancy diversion shown in Figure 1 makes up.
Fig. 4 is the third structural representation that dust cleaning case water conservancy diversion shown in Figure 1 makes up.
Fig. 5 is the 4th kind of structural representation that dust cleaning case water conservancy diversion shown in Figure 1 makes up.
Fig. 6 is the 5th kind of structural representation that dust cleaning case water conservancy diversion shown in Figure 1 makes up.
The specific embodiment
Please with reference to Fig. 1, the utility model dust pelletizing system 1 can be applied to the dry dust removal sweeping machine or dust-contained airflow carried out the deduster of dust removal by filtration.Dust pelletizing system 1 comprises dust cleaning case 100 and suction nozzle 200.The dust that dust cleaning case 100 filters is discharged to dustbin through suction nozzle 200.
Dust cleaning case 100 comprises casing 10, high pressure dust remover 20 and filter inflator 30.Establish dividing plate 17 in the casing 10 casing 10 is separated into casing top 12 and lower box 13.Exhaust outlet 15 is offered on casing top 12, and high pressure dust remover 20 is installed in casing top 12.Filter inflator 30 can be installed on the dividing plate 17 separably, or is installed in lower box 13 through fixture (figure does not show).Filter inflator 30 comprises the net tube 31 that is rolled into by filter screen, and an end of net tube 31 does not seal, and is the top 32 of filter inflator 30; Other end sealing is the bottom 33 of filter inflator 30.Offer the through hole corresponding (figure does not show) on the dividing plate 17, thereby the top 32 of filter inflator 30 communicates with exhaust outlet 15 with the top of filtering inflator 30 32.Air inlet 16 is offered near 32 places, top of filtering inflator 30 in the upper end of lower box 13.Dust-contained airflow gets into casing 10 from air inlet 16, through filtering the filtration of inflator 30, discharges through exhaust outlet 15 at last then.The bottom of casing 10 is designed to or is connected with the flue-dust retainer 14 of taper near the bottom 33 of filter inflator 30, and with the convenient dust of collecting after filtering, the bore of flue-dust retainer 14 dwindles from top to bottom gradually.Dust after the filter drops to and falls into flue-dust retainer 14, is discharged to dustbin through suction nozzle 200 then.
Among Fig. 1, arrow A is the flow direction of dust-contained airflow, and arrow B is the flow direction of the clean gas of filtering through filter inflator 30, and arrow C is the flow direction of the gases at high pressure that discharge of high pressure dust remover 20, and arrow D is the direction that the dust that filters out falls.In the present embodiment, dust-contained airflow gets into from lower box 13 tops, and after filtering inflator 30 filtrations, cleaned air can get into casing top 12 and finally enter atmosphere.Through programme-control, high pressure dust remover 20 can regularly discharge pressure-air filter inflator 30 is blown spray, is adsorbed on the dust of filter inflator 30 outer surfaces with removing.The dust that is eliminated falls into the flue-dust retainer 14 of lower box 13 in the effect of own wt and dust-contained airflow, and finally is admitted to dustbin through suction nozzle 200.
Please in the present embodiment, establish the filter inflator 30 of four symmetric arrays in the lower box 13 simultaneously with reference to Fig. 2, lower box 13 is whole rectangular, and lower box 13 has 131, four side panels of four side panels 131 and adopts hypotenuse 134 to connect.Air inlet 16 is located at the middle part of one of them side panel 131.Two straight deflector 132, two straight deflectors 132 are set at air inlet 16 places extend, become splayed to the center of air inlet 16.The middle inside of other three side panels 131 is provided with V-arrangement protruding 133.The middle part of the inner space of lower box 13 is provided with two arc deflector 136a, and said two arc deflector 136a are corresponding to respectively two filter inflators 30 near air inlet 16 places.The length of deflector 136a can be the same or different with the length of filter inflator 30, mainly sees design demand.Straight deflector 132, V-arrangement protruding 133 and arc deflector 136a form first kind of structure of water conservancy diversion combination, and the dust-contained airflow that gets into lower box 13 is flowed around filter inflator 30.
Preferably, casing 10 adopts bending plate, can use thin board making casing 10 panels like this, need not to be provided with inner frame and buttress brace, more saves material.Simultaneously, because casing 10 welding capacity significantly reduce, the distortion during casing 10 is made is littler, the assurance that more is easy to get of the flatness of casing 10.But casing 10 also can not adopt bending plate to make the panel of casing 10, and uses the mode of non-bending plate addition template to make, and adopts close forming part (support plate or arc plate) and the splicing of casing 10 inner panels at existing bending part.
Fig. 3 has shown second kind of structure of water conservancy diversion combination, and on the basis of first kind of structure of water conservancy diversion combination, cancellation is over against the convexity 133 of the middle inside of the side panel 131 of dust-contained airflow import, make with air inlet 16 over against the inboard of side panel 131 be flat surface.
Fig. 4 has shown the third structure of water conservancy diversion combination, on the basis of first kind of structure of water conservancy diversion combination, with two arc deflector 136a extend to the said side panel 131 that is positioned at said air inlet 16 2 sides on the V-arrangement protruding 133 formation deflector 136b that is connected.
Fig. 5 has shown the 4th kind of structure of water conservancy diversion combination, on the basis of the third structure of water conservancy diversion combination, the convexity 133 of cancellation on the side panel 31 of air inlet 16, make with air inlet 16 over against the inboard of side panel 131 be flat surface.
Fig. 6 has shown the 5th kind of structure of water conservancy diversion combination; On the basis of first kind of structure of water conservancy diversion combination; Deflector 136a is replaced by four end to end arc deflector 136c; Corresponding respectively the cross sections of the four arc deflector 136c structure that assumes diamond in shape towards 30, four end to end arc deflector 136c of four filter inflators.Be appreciated that; Four end to end arc deflector 136c also can be replaced by a rectangular entity with four end to end arcuate flanks; These four arcuate flanks are corresponding to respectively four filter inflators 30, the cross section of these four arcuate flanks structure that assumes diamond in shape.
In order regularly filter inflator 30 to be taken out cleaning; In the present embodiment; Casing top 12 is one-body molded with lower box 13, and lower box 13 is provided with a side door (figure does not show) that sealing strip is housed on a side plate 131 therein, and filter inflator 30 takes out from side door.In other embodiments, casing top 12 can be installed on the lower box 13 separably or be the lid of opening of lower box 13.
The quantity that is appreciated that filter inflator 30 also can be three or other quantity, and this moment, arc deflector can carry out suitable adjustment according to the arrangement position relation of filter inflator 30, so that flow around each filter inflator 30 in dust-contained airflow shunting back.For example, when the quantity of filter inflator 30 is three, and when being arranged in the equilateral triangle shape, can three end to end arc flow deflectors be set at the triangle middle part, every arc flow deflector correspondence is towards a filter inflator 30.
When the dedusting operation; Dust-contained airflow gets into dust cleaning case 100; Middle part in the inner space of casing 10 runs into deflector 136a, 136b, 136c, and portion gas is begun to flow around filter inflator 30 by deflector 136a, 136b, 136c shunting; Continue around 30 rotations of filter inflator the final air-flow that rotates around filter inflator 30 that forms to side panel 131 backs along casing 10 forming surface.Continue forward in the space that other has the part dust-contained airflow to pass deflector 136a, 136b middle part; After running into the side panel 131 on air inlet 16 opposites; Guide face on side panel 131 is split into and flows to antipodal two strands of air-flows, under the water conservancy diversion of side panel 131, forms two strands of air-flows that rotate around filter inflator 30, so far; The dust-contained airflow that gets into dust cleaning case 100 has been divided into around filter inflator 30 airflow flowing under the shunting and guiding of deflector 136a, 136b, 136c and side panel 131.
Center in filter inflator 30 rotating process at dust-contained airflow; Dust is filtered inflator 30 and is filtered; Cleaned air passes filter course, and to get into the filter inflator inner and upwards get into dust cleaning case 100 tops and finally enter atmosphere, and simultaneously, the gases at high pressure that the dust that is detained on filter inflator 30 outer walls is regularly discharged by the high pressure dust remover 20 on casing 10 tops are removed and taken to dust cleaning case 100 belows by the air-flow that rotated by to be let filter inflator 30; Through flue-dust retainer 14, suction nozzle 200, finally get into dustbin.
Compare the following dedusting method that advances upward to arrange of prior art; The dust cleaning case 100 of the utility model takes the enterprising row's of going up dedusting method to improve the efficient of dust removal by filtration; Thereby avoid dust-contained airflow endlessly to pour in and be full of casing 10 inside stopping that the dust of being removed by high pressure dust remover 20 successfully falls into the flue-dust retainer 14 of casing 10 bottoms from dust cleaning case 100 belows; Prevent that effectively the dust that filters from constantly being stirred in the dust-contained airflow again; Reduce the dust concentration in the dust-contained airflow of filtering inflator 30 tops, improve the dust removal by filtration efficient of filter inflator 30.
Dust cleaning case 100 structural changes of the utility model the flow direction of dust-contained airflow in the case, dust-contained airflow is orderly flow regime in dust cleaning case 100, more help promoting the filtering function of filter inflator 30.The dust-contained airflow that gets into dust cleaning case 100 from top has also played the effect of washing away filter inflator 30 surface dusts when flowing around filter inflator 30, help filtering inflator 30 and be in preferable duty all the time.
The above only is the embodiment of the utility model, is not the utility model is done any pro forma restriction; Though the utility model discloses as above with embodiment; Yet be not in order to limiting the utility model, anyly be familiar with the professional and technical personnel, in not breaking away from the utility model technical scheme scope; When the technology contents of above-mentioned announcement capable of using is made a little change or is modified to the equivalent embodiment of equivalent variations; In every case be not break away from the utility model technical scheme content, to any simple modification, equivalent variations and modification that above embodiment did, all still belong in the scope of the utility model technical scheme according to the technical spirit of the utility model.

Claims (15)

1. a dust cleaning case is used for dust-contained airflow is filtered, and comprises casing and the filter inflator that is arranged in the casing; Offer exhaust outlet and air inlet on the said casing; Said dust-contained airflow gets in the casing from air inlet, filters the back through the filter inflator and discharges from exhaust outlet, and it is characterized in that: said air inlet is near the top of said filter inflator; The top of said filter inflator communicates with said exhaust outlet, the bottom lock of said filter inflator.
2. dust cleaning case as claimed in claim 1 is characterized in that: be provided with the water conservancy diversion combination in the said casing dust-contained airflow that gets in the said casing is flowed around said filter inflator.
3. dust cleaning case as claimed in claim 2 is characterized in that: said water conservancy diversion combination comprises the two straight deflectors of being located at the air inlet place, and said two straight deflectors extend to the center of said air inlet.
4. dust cleaning case as claimed in claim 3; It is characterized in that: the quantity of said filter inflator is four; Said water conservancy diversion combination also comprises two arc deflectors of being located at middle part in the said casing, and said two arc deflectors are corresponding to respectively two said filter inflators near the air inlet place.
5. dust cleaning case as claimed in claim 4 is characterized in that: said casing comprises four side panels, and said four side panels adopt hypotenuse to connect.
6. dust cleaning case as claimed in claim 5 is characterized in that: said air inlet is positioned on one of them said side panel, and it is protruding that the middle inside of its excess-three said side panel forms V-arrangement, and said hypotenuse and said V-arrangement convexity are the part of said water conservancy diversion combination.
7. dust cleaning case as claimed in claim 5; It is characterized in that: said air inlet is positioned on one of them said side panel; The middle inside that is positioned at the said side panel of said air inlet two sides forms the V-arrangement convexity; Said hypotenuse and said V-arrangement convexity are the part of said water conservancy diversion combination, with said air inlet over against the inboard of said side panel be flat surface.
8. dust cleaning case as claimed in claim 6 is characterized in that: said two arc deflectors are connected with the said V-arrangement on the said side panel that is positioned at said air inlet two sides is protruding.
9. dust cleaning case as claimed in claim 7 is characterized in that: said two arc deflectors are connected with the said V-arrangement on the said side panel that is positioned at said air inlet two sides is protruding.
10. dust cleaning case as claimed in claim 6 is characterized in that: said water conservancy diversion combination also comprises other two arc deflectors of being located at middle part in the casing, and said four arc deflectors join end to end and be corresponding to respectively said four filtration inflators.
11. dust cleaning case as claimed in claim 2; It is characterized in that: the quantity of said filter inflator is four; Said water conservancy diversion combination also comprises the rectangular entity with four end to end arcuate flanks of being located at middle part in the said casing; Said four arcuate flanks are corresponding to respectively said four filter inflators, the cross section of said four arcuate flanks structure that assumes diamond in shape.
12. dust cleaning case as claimed in claim 1 is characterized in that: in the said casing dividing plate is set, said dividing plate is divided into casing top and lower box with casing, and said exhaust outlet is located at said casing top; Said air inlet is located at said lower box, and said dividing plate is provided with and the corresponding through hole in the top of said filter inflator.
13. dust cleaning case as claimed in claim 12; It is characterized in that: said dust cleaning case also comprises the high pressure dust remover; Said high pressure dust remover is installed on said casing top, and said high pressure dust remover regularly feeds high pressure draught is adsorbed on said filter inflator outer surface with removing dust to the top of said filter inflator.
14. like each described dust cleaning case of claim 1 to 13, it is characterized in that: the bottom of said casing is provided with flue-dust retainer.
15. a dust pelletizing system is characterized in that: comprise suction nozzle and dustbin and dust cleaning case as claimed in claim 14, said suction nozzle is connected with said flue-dust retainer, and the dust of said flue-dust retainer is discharged to dustbin through said suction nozzle.
CN2011205145193U 2011-12-12 2011-12-12 Dust-removing box and dust-removing system provided with dust-removing box Expired - Lifetime CN202315584U (en)

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Application Number Priority Date Filing Date Title
CN2011205145193U CN202315584U (en) 2011-12-12 2011-12-12 Dust-removing box and dust-removing system provided with dust-removing box

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN2011205145193U CN202315584U (en) 2011-12-12 2011-12-12 Dust-removing box and dust-removing system provided with dust-removing box

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CN202315584U true CN202315584U (en) 2012-07-11

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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102397729A (en) * 2011-12-12 2012-04-04 中联重科股份有限公司 Dust removing box and dust removing system with same
CN103536249A (en) * 2012-07-12 2014-01-29 湖北随州合力汽车销售有限公司 Dust removal separation box of vacuum sweeper
CN116672831A (en) * 2023-08-02 2023-09-01 江苏兴达净化科技发展有限公司 Dust removal filter cartridge with cleaning function

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102397729A (en) * 2011-12-12 2012-04-04 中联重科股份有限公司 Dust removing box and dust removing system with same
CN102397729B (en) * 2011-12-12 2014-11-26 长沙中联重科环卫机械有限公司 Dust removing box and dust removing system with same
CN103536249A (en) * 2012-07-12 2014-01-29 湖北随州合力汽车销售有限公司 Dust removal separation box of vacuum sweeper
CN116672831A (en) * 2023-08-02 2023-09-01 江苏兴达净化科技发展有限公司 Dust removal filter cartridge with cleaning function
CN116672831B (en) * 2023-08-02 2023-10-20 江苏兴达净化科技发展有限公司 Dust removal filter cartridge with cleaning function

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Owner name: ENVIRONMENTAL + SANITATION MACHINERY BRANCH OF CHA

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Patentee after: Changsha Zoomlion Environmental Industry Co.,Ltd.

Address before: 410013 Yuelu District, Hunan, silver basin Road, No. 361, No.

Patentee before: ZOOMLION HEAVY INDUSTRY SCIENCE&TECHNOLOGY Co.,Ltd.

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