EP0896835B1 - Air cleaner - Google Patents

Air cleaner Download PDF

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Publication number
EP0896835B1
EP0896835B1 EP98900702A EP98900702A EP0896835B1 EP 0896835 B1 EP0896835 B1 EP 0896835B1 EP 98900702 A EP98900702 A EP 98900702A EP 98900702 A EP98900702 A EP 98900702A EP 0896835 B1 EP0896835 B1 EP 0896835B1
Authority
EP
European Patent Office
Prior art keywords
air
electrode plates
section
fan
cleaning apparatus
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.)
Expired - Lifetime
Application number
EP98900702A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP0896835A1 (en
EP0896835A4 (en
Inventor
Kiyoshi Toida
Makoto Nozawa
Daisuke Takahashi
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.)
Midori Anzen Co Ltd
Original Assignee
Midori Anzen Co Ltd
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 Midori Anzen Co Ltd filed Critical Midori Anzen Co Ltd
Publication of EP0896835A1 publication Critical patent/EP0896835A1/en
Publication of EP0896835A4 publication Critical patent/EP0896835A4/en
Application granted granted Critical
Publication of EP0896835B1 publication Critical patent/EP0896835B1/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B03—SEPARATION OF SOLID MATERIALS USING LIQUIDS OR USING PNEUMATIC TABLES OR JIGS; MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
    • B03C—MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
    • B03C3/00—Separating dispersed particles from gases or vapour, e.g. air, by electrostatic effect
    • B03C3/017—Combinations of electrostatic separation with other processes, not otherwise provided for
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B03—SEPARATION OF SOLID MATERIALS USING LIQUIDS OR USING PNEUMATIC TABLES OR JIGS; MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
    • B03C—MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
    • B03C3/00—Separating dispersed particles from gases or vapour, e.g. air, by electrostatic effect
    • B03C3/02—Plant or installations having external electricity supply
    • B03C3/04—Plant or installations having external electricity supply dry type
    • B03C3/12—Plant or installations having external electricity supply dry type characterised by separation of ionising and collecting stations
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B03—SEPARATION OF SOLID MATERIALS USING LIQUIDS OR USING PNEUMATIC TABLES OR JIGS; MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
    • B03C—MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
    • B03C3/00—Separating dispersed particles from gases or vapour, e.g. air, by electrostatic effect
    • B03C3/32—Transportable units, e.g. for cleaning room air
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B03—SEPARATION OF SOLID MATERIALS USING LIQUIDS OR USING PNEUMATIC TABLES OR JIGS; MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
    • B03C—MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
    • B03C3/00—Separating dispersed particles from gases or vapour, e.g. air, by electrostatic effect
    • B03C3/34—Constructional details or accessories or operation thereof
    • B03C3/36—Controlling flow of gases or vapour
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B03—SEPARATION OF SOLID MATERIALS USING LIQUIDS OR USING PNEUMATIC TABLES OR JIGS; MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
    • B03C—MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
    • B03C3/00—Separating dispersed particles from gases or vapour, e.g. air, by electrostatic effect
    • B03C3/34—Constructional details or accessories or operation thereof
    • B03C3/38—Particle charging or ionising stations, e.g. using electric discharge, radioactive radiation or flames
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B03—SEPARATION OF SOLID MATERIALS USING LIQUIDS OR USING PNEUMATIC TABLES OR JIGS; MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
    • B03C—MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
    • B03C3/00—Separating dispersed particles from gases or vapour, e.g. air, by electrostatic effect
    • B03C3/34—Constructional details or accessories or operation thereof
    • B03C3/40—Electrode constructions
    • B03C3/60—Use of special materials other than liquids
    • B03C3/64—Use of special materials other than liquids synthetic resins
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B03—SEPARATION OF SOLID MATERIALS USING LIQUIDS OR USING PNEUMATIC TABLES OR JIGS; MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
    • B03C—MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
    • B03C3/00—Separating dispersed particles from gases or vapour, e.g. air, by electrostatic effect
    • B03C3/34—Constructional details or accessories or operation thereof
    • B03C3/82—Housings

Definitions

  • the present invention relates to an air cleaning apparatus for collecting electrically particles floating in an air such as dusts, bacteria and odor substances.
  • air inlet openings 1a are formed in one side wall of an elongated casing 1 and air outlet openings 1b are formed in a top wall of the casing as shown in Fig. 1.
  • a fan 2 for making an air stream introduced from the air inlet openings 1a and exhausted from the air outlet openings 1b.
  • a charging and collecting section 3 for electrostatically charging particles in the air stream and collecting the thus charged particles is arranged at a lower portion of the casing. Further, behind the charging and collecting section 3, is arranged a duct 4 for introducing an air into the fan 2.
  • FIG. 2 there has been another known air cleaning apparatus, in which air inlet openings 5a are formed in a bottom wall of an elongated casing 5 and air outlet openings 5b are formed in a top wall of the casing 5. Also in this air cleaning apparatus, a fan 6 is provided in an upper portion of the casing 5 and a charging and collecting section 7 is arranged in a bottom portion of the casing.
  • the duct 4 is provided behind the charging and collecting section 3, and therefore a miniaturization is difficult. Moreover, a direction of the air stream is abruptly changed by the duct 4, there is also a problem that a pressure loss is large.
  • the known air cleaning apparatus illustrated in Fig. 2 since a width of the air inlet openings 5a is small, an air flow rate is limited.
  • the apparatus since the elongated casing 1, 5 is used and the fan 2, 6 and charging and collecting section 3, 7 are arranged in the upper and lower portions of the elongated casing, respectively, the apparatus is liable to be turned and the miniaturization is difficult.
  • JPA2181094 describes an air cleaning apparatus comprising a first inlet opening and a second inlet opening, an outlet opening communicating with these inlet openings, a casing forming an airflow path extending from said first inlet opening to said outlet opening for cleaning air and an airflow path extending from said second inlet opening to said outlet opening for causing airflow, a fan provided in between said individual airflow path, an air cleaner provided in said airflow path, and a shutter provided between said airflow path for cleaning air and said air flow path for causing air flow.
  • US 4,344,776 describes an electrostatic air filter comprising a housing, an air inlet and an air outlet in the housing, air transfer means for transferring air from the inlet to the outlet through an airflow path, air ionizing means located in the air path for generating and introducing charged ions into the throughflowing air and a disposable, electrically conductive air filter mat located and replaceably supported adjacent the outlet.
  • an air cleaning apparatus comprising a casing having air inlet openings and air outlet openings, a fan provided within said casing and flowing an air stream from said air inlet openings to said air outlet openings; and a charging section arranged between said air inlet openings and said fan for charging particles in the air stream; and a collecting section arranged at a downstream position with respect to said charging section; wherein said charging section consists of a plurality of discharge electrode plates (21 b) and a plurality of the first counter electrode plates (22b), said collecting section consists of high-tension electrode plates (23b) and the second counter electrode plates (22c), a lateral cross section of said charging section and said collecting section are arranged to surround said fan in a substantially arcuate configuration, said high-tension electrode plates (23b) and said second counter electrode plates (22c) of said collecting section are formed in the direction perpendicular to the axis of rotation of said fan, and these electrode plates are arranged alternatively in parallel with each other in the direction parallel to
  • Fig. 3 is a lateral cross section showing a first embodiment of the air cleaning apparatus 10 according to the invention.
  • a casing 11 having a semicircular cross section and a substantially semi-cylindrical shape as a whole, there are arranged an ionizer 12 constituting a charging section, a collector 13 constituting a collecting section, an ozone decomposing filter 14 divided into a plurality of parts and a fan 15 including a driving motor not shown, said parts being arranged in this order viewed from an upper portion.
  • the ionizer 12 and collector 13 are connected to a voltage applying means not shown, and the ionizer 12, collector 13 and voltage applying means are connected to a controlling means also not shown.
  • the ionizer 12 is constructed by a combination of a discharge electrode member 21 and a counter electrode member 22, and the collector 13 is composed of a combination of the counter electrode member 22 and a high-tension electrode member 23 and is arranged to surround the fan 15.
  • the ozone decomposing filter 14 is also arranged to surround the fan 15, but it may be constructed as a single integral curved body.
  • the casing 11 comprises a flat bottom plate 11a, a semicircular top plate 11b and side plates 11c, and a height of the top plate 11b is smaller than a shorter width of the bottom plate 11a.
  • Air inlet openings 11d are formed in the top plate 11b such that a total area of the openings is larger than a half of a surface area of the top plate.
  • air outlet openings 11e are further formed on an outer surface of the casing 11, there is provided an electric operating section 11f, by means of which the ionizer 12, collector 13, fan 15, voltage applying means and controlling means can be operated by a user.
  • stabilizer 11g, rear guide 11h and diffuser 11i to surround the fan 15.
  • the fan 15 serves to introduce an air stream from the air inlet openings 11d and exhaust the air stream from the air outlet openings 11e via the ionizer 12, collector 13 and ozone decomposing filter 14.
  • the ionizer 12 produces a corona discharge and particles in the air are charged
  • the collector 13 collects the thus charged particles by Coulomb's force
  • the ozone decomposing filter 14 serves to decompose an ozone gas produced by the ionizer 12 without leaking the ozone gas out of the apparatus.
  • a pre-filter may be arranged in an upstream position to the ionizer 12, and then relatively large particles may be collected by the pre-filter.
  • the discharge electrode member 21 constituting the ionizer 12 is constructed by pressing a conductive metal plate.
  • the discharge electrode member 21 comprises a frame plate 21a which is arranged along the top plate 11b at an inner side of the air inlet openings 11d of the casing 11, a plurality of discharge electrode plates 21b extending in parallel with each other perpendicularly to the frame plate 21a, a plurality of needle-like projections 21c provided on lower edges of said discharge electrode plates 21b, and a plurality of air passing openings 21d formed in the flame plate 21a at positions between successive discharge electrode plates 21 b.
  • the counter electrode member 22 constituting both the ionizer 12 and collector 13 is made of an electrically conductive resin having a hygroscopic property and a volume specific resistance not larger than 10 7 ⁇ cm.
  • the counter electrode member 22 comprises a frame plate 22a which is arranged underneath the frame plate 21a of the discharge electrode member 21 such that the frame plate 22a extends along the frame plate 2 1a, a plurality of first counter electrodes plates 22b extending upward from the frame plate 22a such that the first counter electrodes plates 22b extend in parallel with the discharge electrode plates 21b of the discharge electrode member 21, a plurality of arcuate second counter electrodes plates 22c extending downward from the frame plate 22a such that the second counter electrode plates 22c are perpendicular to the first counter electrode plates 22b, and air passing openings 22d formed between successive first counter electrode plates 22b.
  • the high-tension electrode member 23 constituting the collector 13 is made of a semi-conductive resin having a hygroscopic property and a volume specific resistance of 10 8 -10 13 ⁇ cm, particularly 10 10 -10 13 ⁇ cm.
  • the high-tension electrode member 23 comprises a frame plate 23a which is arranged along the ozone decomposing filter 14 along the inner surface of the frame plate 22a of the counter electrode member 22, a plurality of arcuate high-tension electrode plates 23b extending between successive second counter electrode plates 22c of the counter electrode member 22, and a plurality air passing openings 23c formed in the frame plate 22a between successive high-tension electrode plates 23b.
  • discharge electrode member 21, counter electrode member 22 and high-tension electrode member 23 are assembled such that the discharge electrode plates 21b of the discharge electrode member 21 and first counter electrode plates 22b of the counter electrode member 22 are arranged alternatively in parallel with each other, and the second counter electrode plates 22c of the counter electrode member 22 and high-tension electrode plates 23b of the high-tension electrode member 23 are arranged alternatively in parallel with each other.
  • the ionizer 12 producing corona discharge between the needle-like projections 21c of the discharge electrode member 21 and the first counter electrode plates 22b of the counter electrode member 22 and the collector 13 generating an electrostatic field between the second counter electrode plates 22c of the counter electrode member 22 and the high-tension electrode plates 23b of the high-tension electrode member 23 are constructed.
  • the voltage applying means is constructed to apply a high DC voltage of 3-6 kV, more preferably 4.5 kV (280 ⁇ A) to the ionizer 12 as well as to apply a high DC voltage of 2-4 kV, more preferably 2.2 kV to the collector 12.
  • the operating section 11f is operated to start the fan 15 and at the same time negative voltages are applied to the discharge electrode member 21 and high-tension electrode member 23 from the voltage applying means. Then, an air steam is introduced from the air inlet openings 11d of the casing 11, flows through the air conduit openings 21d of the discharge electrode member 21, air conduit openings 22d of the counter electrode member 22, air conduit openings 23c of the high-tension electrode member 23, and is exhausted to the external through the air outlet openings 11e of the casing 11.
  • the corona discharge is produced between the needle-like projections 21c of the discharge electrode member 21 and the first electrode plates 22b of the counter electrode member 22 in the ionizer 12, and particles in the air such as dusts, bacteria and odor substances are charged.
  • an ozone gas is produced.
  • the charged particles are captured by a Coulomb's force within the collector 13 due to an electrostatic field generated between the high-tension electrode plates 23b of the high-tension electrode member 23 and the second counter electrode plates 22c of the counter electrode member 22.
  • the air stream introduced from the air inlet openings 11d is cleaned and the thus cleaned air is exhausted from the air outlet openings 11e.
  • Fig. 8 is a perspective view showing a second embodiment of the air cleaning apparatus 40 according to the invention.
  • a casing 41 there are arranged a pre-filter 42, an ionizer 43, a collector 44, an ozone decomposing filter 45 and a fan 46.
  • the pre-filter 42, ionizer 43, collector 44 and ozone decomposing filter 45 have a substantially arcuate lateral cross section surrounding the fan 46.
  • the casing 41 comprises a bottom plate 41 a, side plates not shown, air inlet openings 41d, air outlet openings 41e, an operating section not shown, a rear guide 41 h and a diffuser 41 i like as the previous embodiment.
  • the ionizer 43 is constructed by a combination of a discharge electrode member 51 and a counter electrode member 52, and the collector 44 is formed by a combination of the counter electrode member 52 and a high-tension electrode member 53.
  • the discharge electrode member 51 is formed by an electrically conductive metal plate like as the first embodiment, and includes a plurality of arcuate discharge electrode plates 51a surrounding the fan 46, connecting plates 5 1b connecting respective ends of the discharge electrode plates 51a, a number of needle-like projections 51c provided on upper edges of the discharge electrode plates 51a, and a plurality of air conduit openings 51d provided between successive discharge electrode plates 51a.
  • the counter electrode member 52 is made of an electrically conductive resin like as the first embodiment, and includes a plurality of arcuate first counter electrode plates 52a which are arranged between successive discharge electrode plates 51a of the discharge electrode member 51 in parallel with each other within the air conduit openings 51d, connecting plates 52b connecting respective ends of these first counter electrode plates 52a, arcuate second counter electrode plates 52c whose number is identical with or larger than that of the first counter electrode plates 52a and which extend downwardly from lower edges of the first counter electrode plates 52a, and air conduit openings 52d formed between successive first counter electrode plates 52a as illustrated in Fig. 11.
  • the high-tension electrode member 53 is also made of a semiconductive resin like as the first embodiment, and comprises a plurality of substantially arcuate high-tension electrode plates 53a arranged in parallel with the second counter electrode plates 52c of the counter electrode member 52, connecting plates 53b connecting respective ends of these high-tension electrode plates 53a, and air conduit openings 53c formed between successive high-tension electrode plates 53a as shown in Fig. 12.
  • the air cleaning apparatus 40 of the second embodiment has similar function to that of the first embodiment.
  • the charging and collecting section is arranged to surround the fan, and therefore the apparatus can be compact and the air stream can be smoothly flown from the air inlet openings to the air outlet openings.

Landscapes

  • Electrostatic Separation (AREA)
  • Disinfection, Sterilisation Or Deodorisation Of Air (AREA)
EP98900702A 1997-01-31 1998-01-22 Air cleaner Expired - Lifetime EP0896835B1 (en)

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
JP3273697 1997-01-31
JP32736/97 1997-01-31
JP3273697 1997-01-31
PCT/JP1998/000245 WO1998033596A1 (fr) 1997-01-31 1998-01-22 Epurateur d'air

Publications (3)

Publication Number Publication Date
EP0896835A1 EP0896835A1 (en) 1999-02-17
EP0896835A4 EP0896835A4 (en) 2000-06-07
EP0896835B1 true EP0896835B1 (en) 2005-04-20

Family

ID=12367130

Family Applications (1)

Application Number Title Priority Date Filing Date
EP98900702A Expired - Lifetime EP0896835B1 (en) 1997-01-31 1998-01-22 Air cleaner

Country Status (5)

Country Link
EP (1) EP0896835B1 (zh)
KR (1) KR100338246B1 (zh)
CN (1) CN1216007A (zh)
DE (1) DE69829805T2 (zh)
WO (1) WO1998033596A1 (zh)

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2864527B1 (de) 2012-06-19 2017-09-06 Aucos Ag Galvanoanlage mit mehreren bädern und mindestens einer einhausung
CN104138803B (zh) * 2013-05-06 2016-06-08 孙红梅 设有风轮电极放电装置的净化器
CN205505225U (zh) * 2016-04-07 2016-08-24 区述培 一种低臭氧的取暖及空气净化器组合器具
KR102043352B1 (ko) * 2019-03-12 2019-11-12 한국주택시설관리(주) 터널용 공기 정화 및 흡음 장치

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5524558A (en) * 1978-08-09 1980-02-21 Matsushita Electric Ind Co Ltd Electrical dust precipitator
IL57677A0 (en) * 1979-06-27 1979-10-31 Amcor Ltd An improved electrostatic air filter
JPH02181094A (ja) * 1989-01-06 1990-07-13 Mitsubishi Electric Corp 送風装置
JP3516725B2 (ja) * 1994-09-05 2004-04-05 ミドリ安全株式会社 静電集塵装置
JP4149526B2 (ja) * 1995-02-22 2008-09-10 ミドリ安全株式会社 樹脂電極

Also Published As

Publication number Publication date
WO1998033596A1 (fr) 1998-08-06
EP0896835A1 (en) 1999-02-17
DE69829805T2 (de) 2005-09-29
EP0896835A4 (en) 2000-06-07
DE69829805D1 (de) 2005-05-25
CN1216007A (zh) 1999-05-05
KR20000064812A (ko) 2000-11-06
KR100338246B1 (ko) 2002-11-23

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