CN108043132A - A kind of efficient pocket type air dust remover - Google Patents

A kind of efficient pocket type air dust remover Download PDF

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Publication number
CN108043132A
CN108043132A CN201711358585.4A CN201711358585A CN108043132A CN 108043132 A CN108043132 A CN 108043132A CN 201711358585 A CN201711358585 A CN 201711358585A CN 108043132 A CN108043132 A CN 108043132A
Authority
CN
China
Prior art keywords
babinet
filter
wall
idler wheel
spring
Prior art date
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.)
Withdrawn
Application number
CN201711358585.4A
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Chinese (zh)
Inventor
陈伟
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Individual
Original Assignee
Individual
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Individual filed Critical Individual
Priority to CN201711358585.4A priority Critical patent/CN108043132A/en
Publication of CN108043132A publication Critical patent/CN108043132A/en
Withdrawn legal-status Critical Current

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Classifications

    • BPERFORMING OPERATIONS; TRANSPORTING
    • B01PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01DSEPARATION
    • B01D46/00Filters or filtering processes specially modified for separating dispersed particles from gases or vapours
    • B01D46/0039Filters or filtering processes specially modified for separating dispersed particles from gases or vapours with flow guiding by feed or discharge devices
    • B01D46/0041Filters or filtering processes specially modified for separating dispersed particles from gases or vapours with flow guiding by feed or discharge devices for feeding
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B01PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01DSEPARATION
    • B01D46/00Filters or filtering processes specially modified for separating dispersed particles from gases or vapours
    • B01D46/02Particle separators, e.g. dust precipitators, having hollow filters made of flexible material
    • B01D46/023Pockets filters, i.e. multiple bag filters mounted on a common frame
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B01PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01DSEPARATION
    • B01D46/00Filters or filtering processes specially modified for separating dispersed particles from gases or vapours
    • B01D46/02Particle separators, e.g. dust precipitators, having hollow filters made of flexible material
    • B01D46/04Cleaning filters
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B01PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01DSEPARATION
    • B01D46/00Filters or filtering processes specially modified for separating dispersed particles from gases or vapours
    • B01D46/02Particle separators, e.g. dust precipitators, having hollow filters made of flexible material
    • B01D46/06Particle separators, e.g. dust precipitators, having hollow filters made of flexible material with means keeping the working surfaces flat
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B01PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01DSEPARATION
    • B01D46/00Filters or filtering processes specially modified for separating dispersed particles from gases or vapours
    • B01D46/42Auxiliary equipment or operation thereof
    • B01D46/48Removing dust other than cleaning filters, e.g. by using collecting trays

Abstract

The invention discloses a kind of efficient pocket type air dust removers, including babinet and air inlet pipe, the left side top of the babinet is equipped with air inlet pipe, the bottom four corners of the babinet are mounted on foundation, the outer wall of the bag body is connected with the inner wall of top plate, the motor wheel is connected by belt with idler wheel, the outer wall of the idler wheel is equipped with multiple mandrils, the inner cavity of the mandril is equipped with the first spring, the top of first spring is equipped with connecting rod, the top of the connecting rod is equipped with pulley, and the pulley is connected with the outer right wall overlap joint of filter.The efficient pocket type air dust remover, the air pump installed by casing top inner wall, also preventing idler wheel impact, filter is too quickly causes filter damage, the waste residue mouth being equipped with by the bottom of box, the waste residue under filter worry is allow to be dropped out along it, timely cleaning is achieved the purpose that, it is excessive to prevent that box house from stockpiling waste residue, and filter effect is caused to be deteriorated.

Description

A kind of efficient pocket type air dust remover
Technical field
The present invention relates to deduster technical fields, are specially a kind of efficient pocket type air dust remover.
Background technology
Present Boiler Plant becomes the maximum root that air is polluted in city, by ash caused by burning and vulcanization Object, it is most of to be taken out of from boiler by flue gas, if these harmful substances of the device of no purifying smoke are discharged into air, cause tight The pollution of weight, to solve the problems, such as this, the effect of bag filter is just particularly important, such as Application No. CN The patent of invention of 204637825U, including structures such as smoke inlet, multiple through holes, filter cloth bag and conically shapeds, although the invention The structure of patent is simple, but due to easily being blocked at its filter cloth bag, causes dedusting work that can not be normally carried out, to people with Carry out many unnecessary troubles.
The content of the invention
It is an object of the invention to provide a kind of efficient pocket type air dust remover, to solve to propose in above-mentioned background technology The problem of.
To achieve the above object, the present invention provides following technical solution:A kind of efficient pocket type air dust remover, including case Body and air inlet pipe, the left side top of the babinet are equipped with air inlet pipe, and the air inlet pipe runs through babinet, the bottom four of the babinet Angle is mounted on foundation, and the right hand top of the babinet is equipped with gas outlet, and babinet, the bottom of the babinet are run through in the gas outlet Portion is equipped with waste residue mouth, and the waste residue mouth runs through babinet, and the top inner wall of the babinet is equipped with air pump, the left side of the air pump Partition plate is installed, the top of the partition plate is connected with the inner wall of babinet, and top plate is equipped on the right side of the partition plate, the top plate Inner wall of the left and right sides respectively with partition plate and babinet is connected, and the bottom of the top plate is equipped with multiple filters, the filter Through top plate, the bottom of the filter is equipped with supporting plate, and the top corner of the supporting plate is mounted on column, the supporting plate Marsupial body is installed on top, and the outer wall of the bag body is connected with column, and the outer wall of the bag body is connected with the inner wall of top plate, the mistake Idler wheel is installed, the inner cavity of the idler wheel is equipped with bull stick, and the rear and front end of the bull stick is interior with babinet on the right side of filter Wall is connected, and motor is equipped on the right side of the idler wheel, and the motor is connected with the lower surface of top plate, the shaft end installation of the motor There is motor wheel, the motor wheel is connected by belt with idler wheel, and the outer wall of the idler wheel is equipped with multiple mandrils, the mandril Inner cavity is equipped with the first spring, and the top of first spring is equipped with connecting rod, and the top of the connecting rod is equipped with pulley, described Pulley is connected with the outer right wall overlap joint of filter.
Preferably, first baffle is installed, the bottom outer wall of the first baffle is equipped with second on the right side of the partition plate Baffle, the bottom of the second baffle are connected with the inner wall of babinet, and the inner cavity of the second baffle is equipped with second spring, described The top of second spring is connected with first baffle, and the outer wall of the second baffle is provided with multiple slots, the bottom of the first baffle 3rd spring is installed, the right end of the 3rd spring is equipped with inserted block, and the inserted block runs through slot on the right side of portion inner cavity.
Preferably, the left surface of the partition plate is equipped with rubber slab.
Preferably, it is mounted on mainstay at left and right sides of the foundation.
Preferably, fixture block is mounted at left and right sides of the air pump, the upper surface of the fixture block and the inner wall of babinet are washed It is connected.
Compared with prior art, the beneficial effects of the invention are as follows:
1. patent of the present invention, the air pump installed by casing top inner wall have reached the mesh that box house gas is made to circulate , make the air that needs purify along air inlet, via partition plate, after finally flowed out by filter from gas outlet.
2. patent of the present invention by the filter installed on top plate, has achieved the purpose that purify exhaust gas, and pacifies on filter The bag body of dress can be filtered the gas blasted, and the column of the external wall of bag then fixes a bag body, prevent its deformation effect mistake Filter effect.
3. patent of the present invention by connecting motor, has achieved the purpose that idler wheel is driven to rotate, has made the pulley installed on idler wheel Can move in circles impact filter, prevent it because long working, and cause to accumulate excessive dust at bag body and block.
4. patent of the present invention, the first spring installed by mandril inner cavity, make coupled connecting rod can with free shrink, Achieve the purpose that prevent since pulley extension elongation is stuck more than the length between idler wheel and filter, also prevented idler wheel Filter is too quickly causes filter damage for impact.
5. patent of the present invention, the waste residue mouth being equipped with by the bottom of box allow the waste residue under filter worry to be dropped out along it, Timely cleaning is achieved the purpose that, it is excessive to prevent that box house from stockpiling waste residue, and filter effect is caused to be deteriorated.
Description of the drawings
Fig. 1 is schematic structural view of the invention;
Fig. 2 is the filter structure schematic representation of the present invention;
Fig. 3 is the roller structure schematic diagram of the present invention;
Fig. 4 is the first baffle structure diagram of the present invention.
In figure:1st, babinet, 2, air inlet pipe, 3, foundation, 4, gas outlet, 5, waste residue mouth, 6, air pump, 7, top plate, 8, filter, 9th, column, 10, bag body, 11, partition plate, 12, supporting plate, 13, idler wheel, 14, bull stick, 15, motor, 16, motor wheel, 17, belt, 18, Pulley, 19, connecting rod, 20, mandril, the 21, first spring, the 22, first baffle, 23, second baffle, 24, second spring, the 25, the 3rd Spring, 26, inserted block, 27, slot, 28, mainstay, 29, rubber slab, 30, fixture block.
Specific embodiment
Below in conjunction with the attached drawing in the embodiment of the present invention, the technical solution in the embodiment of the present invention is carried out clear, complete Site preparation describes, it is clear that described embodiment is only part of the embodiment of the present invention, instead of all the embodiments.It is based on Embodiment in the present invention, those of ordinary skill in the art are obtained every other without making creative work Embodiment belongs to the scope of protection of the invention.
- 4 are please referred to Fig.1, the present invention provides a kind of technical solution:A kind of efficient pocket type air dust remover, including babinet 1 With air inlet pipe 2, the left side top of babinet 1 is equipped with air inlet pipe 2, can be blasted by air inlet pipe 2 to the inner cavity of babinet 1 to be clean Gas, air inlet pipe 2 runs through babinet 1, and the bottom four corners of babinet 1 are mounted on foundation 3, and the right hand top of babinet 1 is equipped with out Gas port 4, alloing purified gas, babinet 1 is run through in gas outlet 4, and the bottom of babinet 1 is equipped with waste residue mouth 5 along its outflow, Waste residue is made to have achieved the effect that timely cleaning along its outflow, prevent excessive dust stratification from influencing filter effect, waste residue mouth 5 runs through case Body 1, the top inner wall of babinet 1 are equipped with air pump 6, connect the external power supply of air pump 6, make its start-up operation, the drum into air inlet 2 Enter exhaust gas, exhaust gas flows down to the inner cavity of babinet 1 via partition plate 11, under the attraction of air pump 6, entered along air admission hole 2 In filter 8, by and by enter the space on 7 top of top plate after filtering at the bag body 10 on filter 8, in pushing away for air pump 6 It is dynamic lower into gas outlet 4, filtering is completed, the left side of air pump 6 is equipped with partition plate 11, the top of partition plate 11 and the inner wall of babinet 1 It is connected, making gas to be clean, dust is getting to filter 8 after can first precipitating a part in the inner cavity path length of side of babinet 1 On, reduce the dust stratification on filter 8, the right side of partition plate 11 is equipped with top plate 7, the left and right sides of top plate 7 respectively with partition plate 11 It is connected with the inner wall of babinet 1, there are three filter 8, filter 8 carried out exhaust gas by bag body 10 for the bottom installation of top plate 7 Filter, and column 9 then secures bag body 10, prevents its deformation, influences filter effect, filter 8 runs through top plate 7, the bottom of filter 8 Portion is equipped with supporting plate 12, and the top corner of supporting plate 12 is mounted on column 9, the top installation marsupial body 10 of supporting plate 12, bag body 10 Outer wall be connected with column 9, the outer wall of bag body 10 is connected with the inner wall of top plate 7, prevents exhaust gas connecing from top plate 7 and filter 8 It is leaked out at seam, the right side of filter 8 is equipped with idler wheel 13, and the inner cavity of idler wheel 13 is equipped with bull stick 14, the rear and front end of bull stick 14 Inner wall with babinet 1 is connected, and the right side of idler wheel 13 is equipped with motor 15, and power is provided for the rotation of idler wheel 13, motor 15 with The lower surface of top plate 7 is connected, and the shaft end of motor 15 is equipped with motor wheel 16, and motor wheel 16 is connected by belt 17 with idler wheel 13, There are six mandril 20, the inner cavity of mandril 20 is equipped with the first spring 21 for the outer wall installation of idler wheel 13, and the of the installation of 20 inner cavity of mandril One spring 21 can stretch with impact, coupled connecting rod 19 is made constantly to be passed in and out in the inner cavity of mandril 20, prevent due to 18 extension elongation of pulley is stuck more than the length between idler wheel 13 and filter 8, also prevents pulley 18 and impacts 8 mistake of filter Suddenly filter 8 is caused to damage, the top of the first spring 21 is equipped with connecting rod 19, and the top of connecting rod 19 is equipped with pulley 18, pulley 18 are connected with the outer right wall overlap joint of filter 8, connect the external power supply of motor 15, motor wheel 16 is made to drive idler wheel by belt 13 rotate, and the sliding block installed on idler wheel 13 18 is made to impact the rightmost side on filter 8 repeatedly, overlaps the column 9 being connected with pulley 13, Shaken off dust stratification, and impacted using pulley 18, more smooth when alloing impact, the right side of partition plate 11 is equipped with first baffle 22, the bottom outer wall of first baffle 22 is equipped with second baffle 23, and the bottom of second baffle 23 is connected with the inner wall of babinet 1, takes out Going out first baffle 23 can raise its position, and the inner cavity of second baffle 23 is equipped with second spring 24, the top of second spring 24 End is connected with first baffle 22, extracts first baffle 22 out more effortless, decreases the pressure of inserted block 26, prevents that it is old To change, the outer wall of second baffle 23 is provided with seven slots 27, and the 3rd spring 25 is equipped on the right side of the bottom inner cavity of first baffle 22, the The right end of three springs 25 is equipped with inserted block 26, and inserted block 26 runs through slot 27, fixes first baffle 22, extracts first baffle 22 out, Its position is raised, then can limit the flow velocity for blasting gas, increases the path length of gas flowing, makes dust after precipitation Fall in filter 8, be filtered, also improve the drop point of gas, reduce dissipation of the gas at waste residue mouth 5, make its process Filter 8 evenly fully, puts down first baffle 22, then can accelerate the flow velocity of gas, increases filter efficiency, a left side for partition plate 11 Surface is equipped with rubber slab 29, and breeding partition plate 11 damages, and the left and right sides of foundation 3 is mounted on mainstay 28, the left and right two of air pump 6 Side is mounted on fixture block 30, and the upper surface of fixture block 30 is washed with the inner wall of babinet 1 to be connected.
Connect the external power supply of air pump 6, make its start-up operation, blast exhaust gas into air inlet 2, exhaust gas along air admission hole 2, The inner cavity of babinet 1 is flowed down to via partition plate 11, under the attraction of air pump 6, into filter 8, the bag on filter 8 By and by entering the space on 7 top of top plate after filtering at body 10, into gas outlet 4 under the promotion of air pump 6, completed Filter if bag body 10 is blocked because dust stratification is too many in the process, needs to connect the external power supply of motor 15, passes through motor wheel 16 Belt drives idler wheel 13 to rotate, and the sliding block installed on idler wheel 13 18 is made to impact the rightmost side on filter 8 repeatedly, is overlapped with pulley 13 Connected column 9, is shaken off dust stratification, is dropped out via waste residue mouth 5, and in shots, the first of the installation of 20 inner cavity of mandril Spring 21 can stretch with impact, and coupled connecting rod 19 is made constantly to be passed in and out in the inner cavity of mandril 20, is prevented due to cunning It is stuck more than the length between idler wheel 13 and filter 8 to take turns 18 extension elongations, it is too quickly to also prevent the impact filter 8 of pulley 18 Filter 8 is caused to damage.
In the description of the present invention, it is to be understood that term " coaxial ", " bottom ", " one end ", " top ", " middle part ", " other end ", " on ", " one side ", " top ", " interior ", " forepart ", " center ", the orientation of the instructions such as " both ends " or position relationship be Based on orientation shown in the drawings or position relationship, it is for only for ease of the description present invention and simplifies description rather than instruction or dark Show that signified device or element there must be specific orientation, with specific azimuth configuration and operation, thus it is it is not intended that right The limitation of the present invention.
In the present invention, unless otherwise clearly defined and limited, term " installation ", " setting ", " connection ", " fixation ", Terms such as " being screwed on " should be interpreted broadly, for example, it may be being fixedly connected or being detachably connected or integral;It can be with It is mechanical connection or electrical connection;It can be directly connected, can also be indirectly connected by intermediary, can be two The interaction relationship of connection or two elements inside a element, unless otherwise restricted clearly, for the common of this field For technical staff, the concrete meaning of above-mentioned term in the present invention can be understood as the case may be.
It although an embodiment of the present invention has been shown and described, for the ordinary skill in the art, can be with Understanding without departing from the principles and spirit of the present invention can carry out these embodiments a variety of variations, modification, replace And modification, the scope of the present invention is defined by the appended.

Claims (6)

1. a kind of efficient pocket type air dust remover, including babinet (1) and air inlet pipe (2), the left side top peace of the babinet (1) Equipped with air inlet pipe (2), it is characterised in that:Air inlet pipe (2) runs through babinet (1), and the bottom four corners of the babinet (1) are mounted on bottom Column (3), the right hand top of babinet (1) are equipped with gas outlet (4), and the gas outlet (4) runs through babinet (1), the babinet (1) Bottom is equipped with waste residue mouth (5), and the waste residue mouth (5) runs through babinet (1), and the top inner wall of the babinet (1) is equipped with air pump (6), partition plate (11) is installed, the top of the partition plate (11) is connected with the inner wall of babinet (1), institute on the left of the air pump (6) State and top plate (7) be installed on the right side of partition plate (11), the left and right sides of the top plate (7) respectively with partition plate (11) and babinet (1) Inner wall is connected, and the bottom of the top plate (7) is equipped with multiple filters (8), and the filter (8) runs through top plate (7), the mistake The bottom of filter (8) is equipped with supporting plate (12), and the top corner of the supporting plate (12) is mounted on column (9), the supporting plate (12) top installation marsupial body (10), the outer wall of the bag body (10) is connected with column (9), the outer wall of the bag body (10) and The inner wall of top plate (7) is connected, and idler wheel (13) is equipped on the right side of the filter (8), and the inner cavity of the idler wheel (13) is equipped with Bull stick (14), the inner wall of the rear and front end of the bull stick (14) with babinet (1) are connected, are equipped on the right side of the idler wheel (13) Motor (15), the motor (15) are connected with the lower surface of top plate (7), and the shaft end of the motor (15) is equipped with motor wheel (16), the motor wheel (16) is connected by belt (17) with idler wheel (13), and the outer wall of the idler wheel (13) is equipped with multiple tops Bar (20), the inner cavity of the mandril (20) are equipped with the first spring (21), and the top of first spring (21) is equipped with connecting rod (19), the top of the connecting rod (19) is equipped with pulley (18), and the pulley (18) and the outer right wall of filter (8) overlap phase Even.
2. a kind of efficient pocket type air dust remover according to claim 1, it is characterised in that:The right side of the partition plate (11) Side is equipped with first baffle (22), and the bottom outer wall of the first baffle (22) is equipped with second baffle (23), the second gear The bottom of plate (23) is connected with the inner wall of babinet (1), and the inner cavity of the second baffle (23) is equipped with second spring (24), described The top of second spring (24) is connected with first baffle (22), and the outer wall of the second baffle (23) is provided with multiple slots (27), The 3rd spring (25) is installed on the right side of the bottom inner cavity of the first baffle (22), the right end of the 3rd spring (25) is equipped with Inserted block (26), the inserted block (26) run through slot (27).
3. a kind of efficient pocket type air dust remover according to claim 1, it is characterised in that:The partition plate (11) Left surface rubber slab (29) is installed.
4. a kind of efficient pocket type air dust remover according to claim 1-3, it is characterised in that:The foundation (3) The left and right sides is mounted on mainstay (28).
5. a kind of efficient pocket type air dust remover according to claim 1-4, it is characterised in that:The air pump (6) The left and right sides is mounted on fixture block (30), and the upper surface of the fixture block (30) is washed with the inner wall of babinet (1) to be connected.
A kind of 6. efficient pocket type air cleaning method, it is characterised in that:The external power supply of air pump 6 is connected, makes its start-up operation, Blast exhaust gas into air inlet 2, exhaust gas flows down to the inner cavity of babinet 1 via partition plate 11, in air pump 6 along air admission hole 2 Under attraction, into filter 8, by and by entering the sky on 7 top of top plate after filtering at the bag body 10 on filter 8 Between, into gas outlet 4 under the promotion of air pump 6, filtering is completed, if bag body 10 is blocked because dust stratification is too many in the process, The external power supply of connection motor 15 is needed, motor wheel 16 is made by belt idler wheel 13 to be driven to rotate, makes the cunning installed on idler wheel 13 Block 18 impacts the rightmost side on filter 8, overlaps the column 9 being connected with pulley 13 repeatedly, is shaken off dust stratification, via waste residue mouth 5 It drops out, and in shots, the first spring 21 of 20 inner cavity of mandril installation can stretch with impact, make coupled company Bar 19 constantly passes in and out in the inner cavity of mandril 20, prevents from being more than between idler wheel 13 and filter 8 due to 18 extension elongation of pulley Length and it is stuck, also preventing the impact of pulley 18, filter 8 is too quickly that filter 8 is caused to damage.
CN201711358585.4A 2017-12-17 2017-12-17 A kind of efficient pocket type air dust remover Withdrawn CN108043132A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN201711358585.4A CN108043132A (en) 2017-12-17 2017-12-17 A kind of efficient pocket type air dust remover

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN201711358585.4A CN108043132A (en) 2017-12-17 2017-12-17 A kind of efficient pocket type air dust remover

Publications (1)

Publication Number Publication Date
CN108043132A true CN108043132A (en) 2018-05-18

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CN201711358585.4A Withdrawn CN108043132A (en) 2017-12-17 2017-12-17 A kind of efficient pocket type air dust remover

Country Status (1)

Country Link
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Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN108970267A (en) * 2018-07-26 2018-12-11 王自民 A kind of timber production essence polishing workshop deduster
CN111039522A (en) * 2020-01-08 2020-04-21 海伟环境科技有限公司 Equipment and method for purifying water by using natural resources
CN112387065A (en) * 2020-11-14 2021-02-23 湖南正达环保科技有限公司 Organic waste gas nitrogen desorption recovery process
CN114712955A (en) * 2022-04-26 2022-07-08 王小凤 Straight hole ceramic filter

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN108970267A (en) * 2018-07-26 2018-12-11 王自民 A kind of timber production essence polishing workshop deduster
CN108970267B (en) * 2018-07-26 2020-08-14 绍兴柯桥新兴门业有限公司 Dust remover for wooden door production precision polishing workshop
CN111039522A (en) * 2020-01-08 2020-04-21 海伟环境科技有限公司 Equipment and method for purifying water by using natural resources
CN111039522B (en) * 2020-01-08 2020-11-10 海伟环境科技有限公司 Equipment and method for purifying water by using natural resources
CN112387065A (en) * 2020-11-14 2021-02-23 湖南正达环保科技有限公司 Organic waste gas nitrogen desorption recovery process
CN112387065B (en) * 2020-11-14 2023-03-28 湖南正达环保科技有限公司 Organic waste gas nitrogen desorption recovery process
CN114712955A (en) * 2022-04-26 2022-07-08 王小凤 Straight hole ceramic filter

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Application publication date: 20180518