EP0867225A2 - Verfahren und Vorrichtung zur Steuerung einer elektrischen Staubsammelvorrichtung - Google Patents

Verfahren und Vorrichtung zur Steuerung einer elektrischen Staubsammelvorrichtung Download PDF

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Publication number
EP0867225A2
EP0867225A2 EP98301634A EP98301634A EP0867225A2 EP 0867225 A2 EP0867225 A2 EP 0867225A2 EP 98301634 A EP98301634 A EP 98301634A EP 98301634 A EP98301634 A EP 98301634A EP 0867225 A2 EP0867225 A2 EP 0867225A2
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EP
European Patent Office
Prior art keywords
abnormality
dust collector
electric dust
predetermined
time
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Withdrawn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
EP98301634A
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English (en)
French (fr)
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EP0867225A3 (de
Inventor
Yoshihide c/o Konan Factory Gunji
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Bosch Corp
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Zexel Corp
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Filing date
Publication date
Application filed by Zexel Corp filed Critical Zexel Corp
Publication of EP0867225A2 publication Critical patent/EP0867225A2/de
Publication of EP0867225A3 publication Critical patent/EP0867225A3/de
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    • 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
    • B03C3/66—Applications of electricity supply techniques
    • B03C3/68—Control systems therefor

Definitions

  • This invention relates to a method and an apparatus for controlling an electric dust collector, and more particularly to a control method and a control apparatus capable of stopping the operation of an electric dust collector when an abnormality occurs thereto.
  • the voltage between the opposing electrodes of the electric dust collector is sometimes departed from the predetermined range for only a short time. For example, when water drops are deposited on the opposing electrodes, the voltage between the opposing electrodes is lowered and departed from the predetermined range. However, this lowering of voltage between the opposing electrodes occurs for only a short time during which the water drops still remain deposited. The voltage will return to its original level when the water drops are evaporated. Even if a voltage abnormality should occur for only a short time as discussed, the electric dust collector would be, in most cases, in a normal condition.
  • the conventional control apparatus for an electric dust collector has such a problem that when the voltage between the opposing electrodes departs from the predetermined range even instantaneously, it stops the operation of the electric dust collector by judging the electric dust collector to be abnormal notwithstanding that the electric dust collector is in a normal condition.
  • the present invention aims at providing a control method and a control apparatus capable of excluding a short time abnormality of an electric dust collector from a real abnormality.
  • the feature of a control method ofthe present invention resides in a method for controlling an electric dust collector comprising a first step of judging whether or not the abnormality of the electric dust collector intermittently occurs a predetermined plurality of times or more during a predetermined second measuring time; and a second step of performing an abnormal time procedure with respect to the electric dust collector when the abnormality continues during the first measuring time.
  • control method further comprises a third step of judging whether or not the abnormality of the electric dust collector intermittently occurs a predetermined plurality of times or more during a predetermined second measuring time; and a fourth step of temporarily stopping the supply of a high voltage electric current to the one pair of opposing electrodes and resuming the supply of a high voltage electric current to the one pair of opposing electrodes after the passage of a predetermined first standby time when the judgment in the third step is affirmative.
  • the third step may be carried out after the first step is carried out, or the first step may be carried out after the third step is carried out.
  • control method further comprises a fifth step of judging whether or not a phenomenon of the abnormality of the electric dust collector being intermittently occurred a predetermined plurality of times or more during the second measuring time, occurs a predetermined plurality of times; and a sixth step of performing an abnormal time procedure with respect to the electric dust collector when the judgment in the fifth step is affirmative.
  • control method further comprises a seventh step of judging whether or not an abnormality of the electric dust collector continuing during the first measuring time occurs for the first time; and an eighth step of temporarily stopping the supply of a high voltage electric current to the one pair of opposing electrodes and resuming the supply of a high voltage electric current to the one pair of opposing electrodes after the passage of a predetermined second standby time when the judgment in the seven step is affirmative.
  • the feature of a control apparatus of the present invention resides in an apparatus for controlling an electric dust collector comprising abnormality detecting means for detecting an abnormality of the electric dust detector having one pair of opposing electrodes supplied with a high voltage electric current; continuous abnormality judging means for judging whether or not a detection of the abnormality of the electric dust collector by the abnormality detecting means continues during a predetermined first measuring time; and abnormal time procedure means for performing an abnormal time procedure with respect to the electric dust collector when the abnormality detecting means makes an affirmative judgment.
  • control apparatus further comprises intermittent abnormality judging means for judging whether or not the abnormality detecting means intermittently detects the abnormality of the electric dust collector a predetermined plurality of times or more during a predetermined second measuring time; and intermittent abnormal time procedure means for temporarily stopping the supply of a high voltage electric current to the one pair of opposing electrodes when the intermittent abnormality judging means makes an affirmative judgment and resuming the supply of a high voltage electric current to the one pair of opposing electrodes after the passage of a predetermined first standby time.
  • intermittent abnormality judging means for judging whether or not the abnormality detecting means intermittently detects the abnormality of the electric dust collector a predetermined plurality of times or more during a predetermined second measuring time
  • intermittent abnormal time procedure means for temporarily stopping the supply of a high voltage electric current to the one pair of opposing electrodes when the intermittent abnormality judging means makes an affirmative judgment and resuming the supply of a high voltage electric current to the one pair of opposing electrodes after the passage of a predetermined first standby
  • the intermittent abnormality judging means may judge whether or not the abnormality of the electric dust collector continues during the predetermined second measuring time after the continuous abnormality judging means judges whether or not the abnormality of the electric dust collector intermittently occurs a predetermined plurality of times or more during the predetermined first measuring time, or it may judge whether or not the abnormality of the electric dust collector continues during the predetermined first measuring time after the intermittent abnormality judging means judges whether or not the abnormality of the electric dust collector intermittently occurs a predetermined plurality of times or more during the predetermined second measuring time.
  • control apparatus may further comprises number of times judging means for judging whether or not the intermittent abnormality judging means makes an affirmative judgment a plurality of times or more; and the abnormal time procedure means carries out the abnormal time procedure with respect to the electric dust connector when the number of times judging means makes an affirmative judgment.
  • control apparatus further comprises first time abnormality judging means for judging whether or not the affirmative judgment made by the continuous abnormality judging means is a first judgment; and first time abnormal time procedure means for temporarily stopping the supply of a high voltage electric current to the one pair of opposing electrodes when the first time abnormality makes an affirmative judgment and resuming the supply of a high voltage electric current to the one pair of opposing electrodes after the passage of a predetermined second standby time.
  • first time abnormality judging means for judging whether or not the affirmative judgment made by the continuous abnormality judging means is a first judgment
  • first time abnormal time procedure means for temporarily stopping the supply of a high voltage electric current to the one pair of opposing electrodes when the first time abnormality makes an affirmative judgment and resuming the supply of a high voltage electric current to the one pair of opposing electrodes after the passage of a predetermined second standby time.
  • An electric dust collector 1 to be controlled by a control apparatus 2 comprises, as in the conventional equivalent device, a charge unit 11 having one pair of opposing electrodes (not shown) consisting of a discharge electrode and a counterpart opposing electrode, and a high voltage power supply circuit 12 for supplying a high voltage to between the opposing electrodes.
  • the charge unit 11 is provided with a voltage detecting means 13 for detecting a voltage between the one pair of opposing electrodes.
  • the control apparatus 2 judges whether or not an abnormality occurs to the dust collector 1, based on a detection voltage detected by the voltage detecting means 13.
  • the control apparatus 2 stops the supply of high voltage current to the opposing electrodes of the charge unit 11 by the high voltage power supply circuit 12 and resumes the operation later.
  • the control apparatus 2 judges the abnormality as a real abnormality and causes the buzzer 3 to buzz and an alarm lamp to light up to give a warning to the user of the electric dust collector 1.
  • control operation made by the control apparatus 2 will be described in detail.
  • the control operation is carried out in accordance with a program based on the flow chart of Fig. 1.
  • the program based on the flow chart starts.
  • Those memories related to this program are all initialized immediately after start of the program.
  • step S1 After the start of the program, it is judged in step S1 whether or not an abnormality occurs to the electric dust collector 1.
  • This abnormality judgment is carried out by checking whether or not the voltage between the one pair of opposing electrodes is within a predetermined range in this embodiment. The abnormality judgment may be carried out based on an electric current flowing between the one pair of opposing electrodes or on an electric power as a product of the voltage and the electric current.
  • the procedure in step S1 is repeated. That is, it is normally monitored whether or not an abnormality occurs to the voltage between the opposing electrodes.
  • step S2 When an abnormality occurs to the electric dust collector 1, it is judged in step S2 whether or not the abnormality is an intermittent abnormality which intermittently occurs a predetermined plurality of times or more within a predetermined second measuring time. This judgment is carried out to see whether or not the abnormality is temporarily occurred due to deposition of water drops, dusts, or the like on the one pair of opposing electrodes.
  • the length of the second measuring time and the criteria of the number of occurrence of abnormality for judging a certain abnormality as an intermittent abnormality are appropriately established through testing.
  • step S3 If the abnormality occurs to the electric dust collector 1 is not an intermittent abnormality, it is judged in step S3 whether or not the abnormality is a continuous abnormality which continuously occurs within a predetermined first measuring time. This judgement is carried out to see whether or not the abnormality is continuous and requires repair, as caused by wire cutting, short circuit, or the like.
  • the length of the first measuring time is established through testing such that a short time abnormality caused by water drops, or the like can be excluded. It is preferred that the length of the first measuring time is equal to the length of the second measuring time. By doing so, it can simultaneously be judged after the passage of the first measuring time whether the abnormality is an intermittent abnormality or a continuous abnormality.
  • the program returns to step S1. Accordingly, the control apparatus 2 carries out no procedure with respect to the electric dust collector 1.
  • the electric dust connector 1 is kept operated in an ordinary manner.
  • the abnormality of the electric dust collector 1 is a continuous abnormality, it is of a continuous nature and a real abnormality.
  • an abnormal time procedure is carried out by the control apparatus 2 (step S4).
  • This abnormal procedure is the same as in the conventional control apparatus.
  • the abnormal procedure includes stop of the supply of high voltage electric current to the one pair of opposing electrodes of the charge unit 11, actuation of the buzzer 3, and lighting of the alarm lamp 4. Thereafter, the program is ended, and the control operation carried out by the control apparatus 2 with respect to the electric dust collector 1 is finished.
  • step S2 If it is judged in step S2 that the abnormality occurs to the electric dust collector 1 is an intermittent abnormality, an intermittent abnormal time procedure is carried out in steps S5 through S7. That is, in step S5, the supply of voltage electric current to the one pair of opposing electrodes is stopped, and the timer is actuated. Then, in step S6, it is judged whether or not a predetermined first standby time is elapsed after the actuation of the timer. The length of the first standby time is long enough to remove an instantaneous abnormality caused by water drops, or the like deposited on the one pair of opposing electrodes and established through testing. With the passage of the first standby time, the supply of voltage electric current is resumed in step S7. Then, the program returns to step S1.
  • the electric dust collector 1 can be prevented from being operated in a state where an abnormality occurs intermittently and it can be operated only in a normal condition.
  • step S2 it is judged first in step S2 whether or not the abnormality is a continuous abnormality. If it is judged in step S2 that the abnormality is a continuous abnormality, an abnormal time procedure is carried out in step S4. In contrast, if it is judged in step S2 that the abnormality is not a continuous abnormality, it is then judged in step S3 whether or not the abnormality is an intermittent abnormality. If the abnormality is an intermittent abnormality, an intermittent abnormal time procedure is carried out in steps S5 through S7. In contrast, if the abnormality is not an intermittent abnormality, the program returns to step S1. The judgment as to whether or not the abnormality is a continuous abnormality, the judgment as to whether or not the abnormality is an intermittent abnormality, and the procedures for those occasions, are carried out in the same manner as in the embodiment of Fig. 1.
  • step S3' for judging whether the judgment for a continuous abnormality in step S3 is the first judgment or the second judgment afterward is inserted between step S3 for judging whether or not the abnormality is a continuous abnormality and step S4 for carrying out the abnormal time procedure.
  • step S3' If it is judged in step S3' that the judgment for continuous abnormality is the first judgment, the first abnormal time procedure is carried out.
  • Different procedures from the first abnormal time procedure in steps S5 through S7 may be carried out in different steps from steps S5 through S7 inasmuch as the procedure for temporarily stopping the supply of high voltage electric current to the one pair of opposing electrodes and the procedure for resuming the supply of high voltage electric current after the passage of the second standby time are carried out.
  • the length of the second standby time may be different from the length of the first standby time.
  • step S3' If it is judged in step S3' that the judgment for a continuous abnormality is the second time judgment, the program proceeds to step S4 where the abnormal time procedure is carried out.
  • the judgment as to whether the judgment for a continuous abnormality is the first time judgment can be carried out by checking whether the content in a predetermined memory is 0 (first time) or 1 (second time). That is, since the content in a predetermined memory is cleared to 0 when the procedure in step S3' is executed first, due to initialization at the starting time of the program, the judgment for a continuous abnormality is judged to be the first time judgment. After the first execution of step S3', 1 is written in the predetermined memory mentioned above. As a consequence, it is judged that the judgment for a continuous abnormality is performed at least once when the step S3' is executed second time afterward.
  • steps S2 and S3 may be reversed also in this embodiment as in the embodiment of Fig. 2.
  • the second standby time is allowed to pass in the state where the supply of high voltage electric current is stopped and without immediately judging that the abnormality of the electric dust collector 1 is a real abnormality when the continuous abnormality is the first time, it can be prevented that the electric dust collector 1 is judged to be in an abnormal condition even when a comparatively long time is required for the voltage between the one pair of opposing electrodes to return to its normal level as in the case where comparatively large water drops are deposited on the one pair of opposing electrodes.
  • the program returns immediately to step S1 after the intermittent abnormal time procedures in steps S5 through S7 are carried out. It is an interesting alternative that a judgment is made as to whether or not the intermittent abnormal time procedure is carried out a predetermined plurality of times after step S7, and if the judgment is affirmative, the abnormal time procedure is carried out but if the judgment is negative (namely, only when the number of times for carrying out the intermittent abnormal time procedure does not reach a predetermined number), the program then returns to step S1.

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  • Engineering & Computer Science (AREA)
  • Automation & Control Theory (AREA)
  • Electrostatic Separation (AREA)
EP98301634A 1997-03-24 1998-03-05 Verfahren und Vorrichtung zur Steuerung einer elektrischen Staubsammelvorrichtung Withdrawn EP0867225A3 (de)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
JP8877597 1997-03-24
JP08877597A JP3210595B2 (ja) 1997-03-24 1997-03-24 電気集塵器の制御装置
JP88775/97 1997-03-24

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EP0867225A2 true EP0867225A2 (de) 1998-09-30
EP0867225A3 EP0867225A3 (de) 2000-12-20

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US11072955B2 (en) 2017-09-25 2021-07-27 Simotec Co., Ltd. Hinge and hinge monitoring method
US11365574B2 (en) 2017-09-25 2022-06-21 Simotec Co., Ltd. Hinge and hinge monitoring method

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2018062865A (ja) * 2016-10-11 2018-04-19 トヨタ紡織株式会社 オイルセパレータの制御装置
JP7018785B2 (ja) * 2018-02-27 2022-02-14 三菱電機株式会社 空気清浄機

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3772853A (en) * 1970-09-24 1973-11-20 Westinghouse Brake & Signal Automatic voltage control apparatus for electrostatic precipitators
JPS58133849A (ja) * 1982-02-04 1983-08-09 Sumitomo Heavy Ind Ltd 電気集塵装置の異常状態検出装置
JPH03254846A (ja) * 1990-03-01 1991-11-13 Daikin Ind Ltd 電気集塵機の異常検知回路
JPH03275157A (ja) * 1990-03-22 1991-12-05 Daikin Ind Ltd 電気集塵機の異常検知回路
EP0576069A1 (de) * 1992-06-24 1993-12-29 Metallgesellschaft Ag Verfahren zum Führen der Spannung UF eines elektrostatischen Abscheiders an der Durchschlagsgrenze
DE19511442C1 (de) * 1995-03-30 1996-03-07 Babcock Anlagen Gmbh Verfahren zum Betrieb eines elektrostatischen Abscheiders

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3772853A (en) * 1970-09-24 1973-11-20 Westinghouse Brake & Signal Automatic voltage control apparatus for electrostatic precipitators
JPS58133849A (ja) * 1982-02-04 1983-08-09 Sumitomo Heavy Ind Ltd 電気集塵装置の異常状態検出装置
JPH03254846A (ja) * 1990-03-01 1991-11-13 Daikin Ind Ltd 電気集塵機の異常検知回路
JPH03275157A (ja) * 1990-03-22 1991-12-05 Daikin Ind Ltd 電気集塵機の異常検知回路
EP0576069A1 (de) * 1992-06-24 1993-12-29 Metallgesellschaft Ag Verfahren zum Führen der Spannung UF eines elektrostatischen Abscheiders an der Durchschlagsgrenze
DE19511442C1 (de) * 1995-03-30 1996-03-07 Babcock Anlagen Gmbh Verfahren zum Betrieb eines elektrostatischen Abscheiders

Non-Patent Citations (3)

* Cited by examiner, † Cited by third party
Title
PATENT ABSTRACTS OF JAPAN vol. 16, no. 54 (C-909), 12 February 1992 (1992-02-12) & JP 03 254846 A (DAIKIN IND. LTD.), 13 November 1991 (1991-11-13) *
PATENT ABSTRACTS OF JAPAN vol. 16, no. 86 (C-916), 3 March 1992 (1992-03-03) & JP 03 275157 A (DAIKIN LTD), 5 December 1991 (1991-12-05) *
PATENT ABSTRACTS OF JAPAN vol. 7, no. 248 (C-193), 4 November 1983 (1983-11-04) & JP 58 133849 A (SUMITOMO HEAVY IND.), 9 August 1983 (1983-08-09) *

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US11072955B2 (en) 2017-09-25 2021-07-27 Simotec Co., Ltd. Hinge and hinge monitoring method
US11365574B2 (en) 2017-09-25 2022-06-21 Simotec Co., Ltd. Hinge and hinge monitoring method

Also Published As

Publication number Publication date
JPH10263435A (ja) 1998-10-06
EP0867225A3 (de) 2000-12-20
JP3210595B2 (ja) 2001-09-17

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