DK143320B - PRINTING GAS CONNECTION - Google Patents

PRINTING GAS CONNECTION Download PDF

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Publication number
DK143320B
DK143320B DK192175AA DK192175A DK143320B DK 143320 B DK143320 B DK 143320B DK 192175A A DK192175A A DK 192175AA DK 192175 A DK192175 A DK 192175A DK 143320 B DK143320 B DK 143320B
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DK
Denmark
Prior art keywords
injectors
plugs
jet
plug
filter
Prior art date
Application number
DK192175AA
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Danish (da)
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DK143320C (en
DK192175A (en
Inventor
F Kordas
Original Assignee
Intensiv Filter Gmbh
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
Priority claimed from DE19742421846 external-priority patent/DE2421846C3/en
Application filed by Intensiv Filter Gmbh filed Critical Intensiv Filter Gmbh
Publication of DK192175A publication Critical patent/DK192175A/en
Publication of DK143320B publication Critical patent/DK143320B/en
Application granted granted Critical
Publication of DK143320C publication Critical patent/DK143320C/en

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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
    • B01D46/02Particle 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
    • B01D46/66Regeneration of the filtering material or filter elements inside the filter
    • B01D46/70Regeneration of the filtering material or filter elements inside the filter by acting counter-currently on the filtering surface, e.g. by flushing on the non-cake side of the filter
    • B01D46/71Regeneration of the filtering material or filter elements inside the filter by acting counter-currently on the filtering surface, e.g. by flushing on the non-cake side of the filter with pressurised gas, e.g. pulsed air
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16LPIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
    • F16L21/00Joints with sleeve or socket
    • F16L21/02Joints with sleeve or socket with elastic sealing rings between pipe and sleeve or between pipe and socket, e.g. with rolling or other prefabricated profiled rings
    • F16L21/035Joints with sleeve or socket with elastic sealing rings between pipe and sleeve or between pipe and socket, e.g. with rolling or other prefabricated profiled rings placed around the spigot end before connection

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  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Filtering Of Dispersed Particles In Gases (AREA)

Description

(19) DANMARK(19) DENMARK

|j| ”2) FREMLÆGGELSESSKRIFT (11) 143320 B| j | ”2) PRESENTATION LETTER (11) 143320 B

DIREKTORATET FOR PATENT- OG VAREMÆRKEVÆSENETDIRECTORATE OF PATENT AND TRADEMARK

(21) Ansøgning nr. 1921/75 (51) Int.CI.3 B 01 D 46/42 (22) Indleveringsdag 2. maj 1975 (24) Løbedag 2. maj 1975 (41) Aim. tilgængelig 7. nov. 1975 (44) Fremlagt 10. aug. 1981 (86) International ansøgning nr. - (86) International indleveringsdag - (85) Videreførelsesdag - (62) Stamansøgning nr. -(21) Application No. 1921/75 (51) Int.CI.3 B 01 D 46/42 (22) Filing Date 2 May 1975 (24) Expiration Date 2 May 1975 (41) Aim. available 7 Nov. 1975 (44) Submitted 10 Aug. 1981 (86) International application no.

(30) Prioritet 6. maj 1974, 2421846, DE(30) Priority 6 May 1974, 2421846, DE

(71) Ansøger INTENSIV-FILTER GMBH. & CO. KG., D-5602 Langenberg, DE.(71) Applicant for INTENSIV-FILTER GMBH. & CO. KG., D-5602 Langenberg, DE.

(72) Opfinder Friedel Kordas, DE.(72) Inventor Friedel Kordas, DE.

(74) Fuldmægtig Ingeniørfirmaet Lehmann & Ree.(74) Clerk Engineering firm Lehmann & Ree.

(54) Trykgas tilslutning.(54) Compressed gas connection.

Opfindelsen angår en trykgastilslutning til tilslutning af et som stråleinjektor udformet skylleaggregat til trykgastilførselsledningen for støvgasfiltre med en gruppe filterelementer, hvor filterelementerne er lukkede ved deres ene ende og åbne ved deres anden ende og er fastgjorte til stråleinjektorerne og forankrede i en skillebund mellem støvgaskammeret og rengaskammeret og gennemstrømmes udefra og indad og i periodisk rækkefølge kan befries for det på deres udvendige flade qj vedhæftende støv ved hjælp af trykstød med en i modsat retning virkende 3 skyllegasstrøm, som afgives fra stråleinjektorerne, og hvor filterele- N menterne er anbragte i et hus med en støvgasindstrømningsåbning, en ren- v} gasudstrømningsåbning og støvafsugningsorganer, og hvor hver enkelt strå- ^ leinjektor er forbundet med trykgastilførselsledningen ved hjælp af en * □ 143320 2 tilslutning.The invention relates to a pressurized gas connection for connecting a rinsing unit designed as a jet injector to the pressurized gas supply line for dust gas filters with a group of filter elements, the filter elements being closed at one end and open at their other end and attached to the jet injectors flow through from the outside and inwards and in periodic order can be freed of the dust adhering to their outer surface qj by means of pressure shocks with an oppositely acting 3 purge gas stream which is emitted from the jet injectors and where the filter elements are arranged in a housing with a dust gas inflow opening, a clean gas outflow opening and dust extraction means, and where each individual jet injector is connected to the compressed gas supply line by means of a * □ 143320 2 connection.

Ved en stråleinjektor forstås i støvgasteknikken et af en dyse og en injektor bestående skylleaggregat. Ved støvgasfiltre af den foran beskrevne art er det nødvendigt at slutte hver af skylleaggrega-tets stråleinjektorer særskilt til trykgastilførselsledningen på strøm-ningsteknisk fordelagtig måde.In the dust gas technique, a jet injector is understood to mean a rinsing unit consisting of a nozzle and an injector. In the case of dust gas filters of the type described above, it is necessary to connect each of the purge injectors' jet injectors separately to the compressed gas supply line in a flow-technically advantageous manner.

Ved avancerede filtreringsanlæg skal filterslangerne afmonteres og monteres fra rengassiden. Der lægges herunder særlig vægt på, at defekte filterslanger også under filtreringsanlæggets drift skal kunne udskiftes fra rengassiden, idet betrædning af støvgasrummet ikke er mulig under filtreringsanlæggets drift, og af sundhedsmæssige årsager betragtes som utilrådelig under anlæggets stilstand. Desuden anvendes der af hensyn til omkostningerne kun ufaglært arbejdskraft til montering og afmontering henholdsvis til udskiftning af defekte filterslanger. Endvidere skal ved tilbageskylningsaggregater af denne art stråleinjektoren ved hver filterslangeudskiftning aftages fra trykgastilførselsledningen og atter tilsluttes efter udskiftningen. Denne tilslutning kan ikke ske med kendte organer som rørforskruninger, hurtigkoblinger eller slangeforbindelser, fordi der ved de tæt efter hinanden følgende stråleinjektorer ikke er tilstrækkelig plads til anbringelse af sådanne dele, og fremstilling og montering af de enkelte afgreninger og tilslutninger til de enkelte injektorer i teknisk henseende er for kompliceret, og der til selve monteringen kræves et uforholdsmæssigt -stort arbejde og for lang tid.For advanced filtration systems, the filter hoses must be removed and installed from the clean gas side. Particular emphasis is placed on the fact that defective filter hoses must also be able to be replaced from the purge side during the operation of the filtration plant, as entering the dust gas space is not possible during the operation of the filtration plant, and for health reasons is considered inadvisable during plant shutdown. In addition, for reasons of cost, only unskilled labor is used for assembly and disassembly or for replacement of defective filter hoses. In addition, in the case of back-flushing units of this type, the jet injector must be disconnected from the compressed gas supply line at each filter hose replacement and reconnected after the replacement. This connection can not be made with known means such as pipe fittings, quick couplings or hose connections, because with the successive jet injectors there is not enough space for placing such parts, and manufacturing and mounting of the individual branches and connections to the individual injectors in technical is too complicated in this respect, and the installation itself requires a disproportionately large amount of work and too long a time.

Formålet med opfindelsen er derfor at tilvejebringe en for tilslutning for trykgastilførselsledningen i strømningsteknisk fordelagtig form tilstrækkelig tæt trykgasforbindelse ved stråleinjektorerne, som kan fremstilles på den enklest mulige måde og hurtigt og uden anvendelse af hjælpemidler kan afmonteres og monteres selv af ufaglært monteringspersonale .The object of the invention is therefore to provide a sufficiently close compressed gas connection at the jet injectors for connection to the compressed gas supply line in flow-technically advantageous form, which can be manufactured in the simplest possible way and can be disassembled and mounted quickly and without the aid of unskilled assembly personnel.

Denne opgave løses ifølge opfindelsen ved, at tilslutningen mellem stråleinjektoren og trykgastilførselsledningen er udformet som stikforbindelse.This object is solved according to the invention in that the connection between the jet injector and the compressed gas supply line is designed as a plug connection.

Det tekniske fremskridt, som kan opnås ved hjælp af opfindelsen, beror på følgende fordele. Monteringen af stikrørene er den enklest tænkelige. Stikrørene stikkes ét ad gangen ind i stråleinjektorens muffe og skydes efter indsætningen og fastgørelsen af injektoren i filtret ved forsigtig frem- og tilbagedrejning og samtidig forskydning i retning mod nabostråleinjektoren,indtil stikrøret er trængt tilstrækkeligt dybt ind i injektorens muffe. Ved afmontering trækkes stikrøre 3 143320 ne ganske enkelt ud af stråleinjektorernes muffer. Denne fremgangsmåde ved montering og afmontering kan gennemføres uden anvendelse af værktøj eller lignende, varer kun få sekunder og kræver ingen særlige fagkundskaber af monteringspersonalet.The technical progress which can be achieved by means of the invention depends on the following advantages. The installation of the plugs is the simplest imaginable. Insert the plugs one at a time into the socket of the jet injector and slide after inserting and securing the injector in the filter by gently turning it back and forth and simultaneously displacing it towards the neighboring jet injector until the plug tube has penetrated deep enough into the socket of the injector. When disassembling, the plug 3 143320 ne is simply pulled out of the sockets of the jet injectors. This method of assembly and disassembly can be carried out without the use of tools or the like, lasts only a few seconds and does not require any special professional knowledge of the assembly personnel.

Yderligere væsentlige ejendommeligheder ved opfindelsen og derved opnåede fordele beskrives i det følgende. Ifølge en ejendommelighed, som er af væsentlig betydning, er stikforbindelsen et stikrør, som ved hver ende er forsynet med tætningsringe og med sine ender griber ind i muffer på ved siden af hinanden beliggende stråleinjektorer, hvorved stikrørene i skiftende rækkefølge med injektorernes muffer danner en gennemgående ledning.Further essential features of the invention and the advantages thereby obtained are described in the following. According to a feature which is of essential importance, the plug connection is a plug pipe which is provided at each end with sealing rings and with its ends engages in sleeves on adjacent jet injectors, whereby the plug pipes in alternating order with the sleeves of the injectors form a continuous wire.

I en hensigtsmæssig udførelsesform er den af stikrørene og mufferne dannede ledning med sin ene ende sluttet til tryktilførselsap-paratet og er lukket ved sin anden ende.In a suitable embodiment, the line formed by the plugs and the sleeves is connected at one end to the pressure supply device and is closed at its other end.

For at stikrørene skal kunne foretage et vinkeludsving i stråleinjektorernes muffer, har stikrørene ved deres ender en større diameter end ved midten og er med deres ender stukket løst ind i stråleinjektorernes muffer og samtidig er indstiksdybden kortere end stikrørenes mindste diameter.In order for the plugs to be able to make an angular fluctuation in the sleeves of the jet injectors, the plugs at their ends have a larger diameter than at the center and are with their ends inserted loosely into the sleeves of the jet injectors and at the same time the insertion depth is shorter than the smallest diameter.

Tætningerne ved hvert stikrørs to ender er f.eks. udformede som O-ringe. Som monteringshjælp ved montering og afmontering, og som sikring mod at stikrørene forskydes mod siden, når de er monterede, er der på siden af hvert stikrør anbragt en radialt udragende i akseretningen forløbende montageklap, hvis længde er lidt kortere end afstanden mellem to stråleinjektorer.The seals at the two ends of each pipe are e.g. designed as O-rings. As an assembly aid during assembly and disassembly, and as a protection against the plugs being displaced towards the side when they are mounted, a radially projecting mounting flap extending in the axial direction is arranged on the side, the length of which is slightly shorter than the distance between two jet injectors.

På tegningen er en udførelsesform for opfindelsen anskuelig-gjort. På tegningen viser:In the drawing, an embodiment of the invention is illustrated. The drawing shows:

Fig. 1 et støvgasfilter i tværsnit, fig. 2 et snit gennem støvgasfilteret efter linien II-II i fig. 1 med dele fjernet, fig. 3 en plantegning af to stråleinjektorer med monteret stikrør delvis i snit, og fig. 4 set i større målestok en injektors muffe og et stikrør delvis i snit og med dele fjernet.FIG. 1 a dust gas filter in cross section, fig. 2 is a section through the dust gas filter along the line II-II in fig. 1 with parts removed, fig. 3 is a plan view of two jet injectors with mounted plugs partly in section, and fig. 4 seen on a larger scale an injector socket and a plug partly in section and with parts removed.

I et hus 10 med en åbning 11 for støvgasindstrømning, en åbning 12 for rengasudstrømning og en anordning 13 til støvafsugning er der anbragt en skillebund 14, der opdeler huset 10 i et støvgaskammer 15 og et rengaskammer 16. På skillebunden 14 er der ved hjælp af spæp-deplader, spændevinkler eller lignende og spændskruer anbragt strålein---jektorer 17, på hvilke der er fastgjort for neden lukkede og for oven 4 143320 åbne filterslanger 18, som er trukket ind over et støttegitter. Stråleinjektorerne 17 er over en trykgastilførselsledning 19 og en ventil 20 forbundne med en trykgasbeholder 21. Til filtrering af støvgassen gennemstrømmes filterslangerne 18 udefra og indad. Til rensning af filterslangerne 18 for det støv, der afsættes på deres ydre overflade, befries filterslangerne i periodisk rækkefølge for det på deres ydre overflade vedhæftede støv ved hjælp af trykstød med en i modsat retning virkende skyllegasstrøm, som afgives fra stråleinjektorerne 17.In a housing 10 with an opening 11 for dust gas inflow, an opening 12 for clean gas outflow and a device 13 for dust extraction, a separating bottom 14 is arranged, which divides the housing 10 into a dust gas chamber 15 and a cleaning gas chamber 16. On the separating bottom 14, by means of baffle plates, clamping angles or the like, and clamping screws arranged with jet injectors 17, on which filter hoses 18 closed below and open above are attached, which are retracted over a support grid. The jet injectors 17 are connected via a compressed gas supply line 19 and a valve 20 to a compressed gas container 21. For filtering the dust gas, the filter hoses 18 flow through from the outside and inwards. To clean the filter hoses 18 of the dust deposited on their outer surface, the filter hoses are freed in periodic order of the dust adhered to their outer surface by means of pressure shocks with a counter-flowing purge gas stream emitted from the jet injectors 17.

Ifølge opfindelsen består trykgastilførselsledningen 19 i filterslangerne 18's område af stikrør 22 med montageklapper 22a og muffer 23 på stråleinjektorerne 17· Stikrørene 22 er alle vist i monteret stilling, idet dog af hensyn til overskueligheden kun tre filterslanger 18 med tilhørende stråleinjektorer 17 og stikrør 22 er vist. Den store fordel ved opfindelsen bliver imidlertid først indlysende, når man forestiller sig, at der ved sædvanlige filtre er anbragt mange flere filterslanger på række.According to the invention, the compressed gas supply line 19 in the area of the filter hoses 18 consists of plugs 22 with mounting flaps 22a and sleeves 23 on the jet injectors 17. The plugs 22 are all shown in mounted position, however for the sake of clarity only three filter hoses 18 with associated jet injectors 17 and plugs 22 are shown. . However, the great advantage of the invention only becomes apparent when it is imagined that many more filter hoses are arranged in a row with conventional filters.

På siden af hvert stikrør 22 er der anbragt en montageklap 22a. Denne montageklap tjener på grund af sin gode håndterlighed som monteringshjælp ved montering og afmontering og som sikring mod, at stik-rørene 22, når de er monterede, forskydes mod siden, idet sikringen opnås ved, at klapperne 22a, efter stikrørene 22's montering, simpelt hen klappes ned mellem de to overdele af de på hver side beliggende injektorer 17.A mounting flap 22a is arranged on the side of each plug pipe 22. Due to its good handling, this mounting flap serves as a mounting aid during assembly and disassembly and as a protection against the plug tubes 22, when mounted, being displaced to the side, the securing being achieved by the flaps 22a, after mounting the plugs 22, simply fold down between the two upper parts of the injectors 17 on each side 17.

Den nøjagtige form af stikrøret 22 ses i fig. 3· Ved hver ende af stikrøret 22 er der anbragt en ringnot 22b med en indlagt tætningsring 22c. Som tætningsringe kan f.eks. anvendes O-ringe. I stråleinjektorerne 17’s muffer 23 er der anbragt simple cylindriske boringer 23a til optagelse af stikrørene 22.The exact shape of the plug 22 is shown in FIG. 3 · At each end of the plug pipe 22 an annular groove 22b is arranged with an inlaid sealing ring 22c. As sealing rings, e.g. O-rings are used. Simple cylindrical bores 23a for receiving the plugs 22 are arranged in the sleeves 23 of the jet injectors 17.

Ved enden af hver filterslange - henholdsvis injektorrække -befinder der sig en endeprop 24, der har til opgave at lukke den af stikrørene 22 og stråleinjektorerne 17’s muffer 23 bestående trykgastilførselsledning 19· Endeproppen 24 bliver, når anlægget er i drift, trykket mod huset 10's væg 10a af det i stikrørene 22 og mufferne 23 herskende tryk og dermed fikseret i sin stilling på en sådan måde, at der ikke kræves yderligere sikring.At the end of each filter hose - or injector row - there is an end plug 24 which has the task of closing the compressed gas supply line 19 · consisting of the plugs 22 and the injectors 17 of the jet injectors 17 · The end plug 24 is pressed against the wall of the housing 10 when the system is in operation 10a of the pressure prevailing in the plugs 22 and the sleeves 23 and thus fixed in its position in such a way that no further securing is required.

I fig. 4 ses en af de vigtigste ejendommeligheder ved stikrørene 22. Stikrørene 22 har ved deres midte en mindre diameter end ved deres to ender. Herved opnås i forbindelse med rørene 22's korte indstiksdybde i stråleinjektorerne 17's muffer 23 mulighed for et vinkeludsving i forhold til længdeaksen, således som vist i fig. 4 med 5 143320 stregpunkterede linier. Hertil er endvidere indstiksdybden af hvert ind-stiksrør 22's ender kortere end stikrørene 22's mindste diameter. Vinkeludsvinget er nødvendigt for at kunne udligne forskelle i stråleinjektorerne 17's stilling i forhold til hinanden, fordi der ved den sædvanlige fremstillingsmåde til fremstilling af filtre (pladekonstruktioner uden påfølgende bearbejdning) må regnes med større tolerancer. Den foran beskreven form af stikrørsenderne forhindrer, at de klemmes i stråleinjektorerne 17's muffer 2i,og muliggør montering og afmontering af stikrørene 22 uden anvendelse af værktøjer.In FIG. 4 shows one of the most important features of the plugs 22. The plugs 22 have a smaller diameter at their center than at their two ends. In this connection, in connection with the short insertion depth of the tubes 22 in the sleeves 23 of the beam injectors 17, the possibility of an angular swing relative to the longitudinal axis, as shown in fig. 4 with 5 143320 dotted lines. In addition, the insertion depth of the ends of each insertion tube 22 is shorter than the smallest diameter of the insertion tubes 22. The angular fluctuation is necessary in order to be able to compensate for differences in the position of the beam injectors 17 relative to each other, because in the usual manufacturing method for manufacturing filters (plate constructions without subsequent processing) larger tolerances must be taken into account. The shape of the plug ends described above prevents them from being clamped in the sleeves 2i of the jet injectors 17, and enables mounting and dismounting of the plug tubes 22 without the use of tools.

DK192175A 1974-05-06 1975-05-02 PRINTING GAS CONNECTION DK143320C (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE2421846 1974-05-06
DE19742421846 DE2421846C3 (en) 1974-05-06 Compressed gas connection

Publications (3)

Publication Number Publication Date
DK192175A DK192175A (en) 1975-11-07
DK143320B true DK143320B (en) 1981-08-10
DK143320C DK143320C (en) 1981-12-07

Family

ID=5914770

Family Applications (1)

Application Number Title Priority Date Filing Date
DK192175A DK143320C (en) 1974-05-06 1975-05-02 PRINTING GAS CONNECTION

Country Status (11)

Country Link
AT (1) AT349441B (en)
BE (1) BE828714A (en)
CH (1) CH593092A5 (en)
DK (1) DK143320C (en)
ES (1) ES437442A1 (en)
FR (1) FR2270505B1 (en)
GB (1) GB1493499A (en)
IT (1) IT1037894B (en)
NL (1) NL167858C (en)
SE (1) SE415327B (en)
YU (1) YU36099B (en)

Families Citing this family (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3005146C2 (en) * 1980-02-12 1983-04-07 Intensiv-Filter Gmbh & Co Kg, 5620 Velbert Compressed gas connection for dust gas filters
ZA864914B (en) * 1985-07-03 1987-03-25 Howden Environmental Systems Reverse pulse fabric filter
DE8610694U1 (en) * 1986-04-18 1986-07-10 AVK Filtertechnik GmbH, 6467 Hasselroth Device for cleaning z. B. Filters
WO1993007411A1 (en) * 1991-10-01 1993-04-15 Goyen Controls Co. Pty. Limited Connections for valves
JP5574548B2 (en) * 2011-11-01 2014-08-20 東北電機鉄工株式会社 Coanda injector
CN102784508A (en) * 2012-07-18 2012-11-21 金川集团股份有限公司 Intelligent pipe filter
WO2014024817A1 (en) * 2012-08-07 2014-02-13 アクロス商事株式会社 Bag filter air amplification device and bag filter air amplification system using said bag filter air amplification device
CN106268081A (en) * 2015-05-26 2017-01-04 深圳市能源环保有限公司 A kind of injection tube of sack-duster pulse deashing device
US20190107336A1 (en) * 2017-02-24 2019-04-11 Intellihot, Inc. Heat exchanger
CN110681223B (en) * 2019-09-12 2021-10-19 凤台县晶谷粮油贸易有限公司 Pulse bag type dust collector for rice processing and capable of preventing dust accumulation of air injection pipe
CN111467896A (en) * 2020-03-12 2020-07-31 江苏人和环保设备有限公司 Blowing pipe moving structure at end part of filter cartridge type dust remover

Also Published As

Publication number Publication date
DE2421846A1 (en) 1975-11-20
BE828714A (en) 1975-09-01
NL7505213A (en) 1975-11-10
IT1037894B (en) 1979-11-20
YU111875A (en) 1981-06-30
DK143320C (en) 1981-12-07
CH593092A5 (en) 1977-11-30
ES437442A1 (en) 1976-12-16
FR2270505B1 (en) 1981-08-28
GB1493499A (en) 1977-11-30
SE7505280L (en) 1975-11-07
AT349441B (en) 1979-04-10
SE415327B (en) 1980-09-29
NL167858C (en) 1982-02-16
YU36099B (en) 1982-02-25
DK192175A (en) 1975-11-07
DE2421846B2 (en) 1976-05-20
ATA329175A (en) 1978-09-15
FR2270505A1 (en) 1975-12-05

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