CA1212162A - Method for sensing changes in the filtering effect of filtering devices for separation of contamination from gaseous streams and a device for carrying out the method - Google Patents
Method for sensing changes in the filtering effect of filtering devices for separation of contamination from gaseous streams and a device for carrying out the methodInfo
- Publication number
- CA1212162A CA1212162A CA000437252A CA437252A CA1212162A CA 1212162 A CA1212162 A CA 1212162A CA 000437252 A CA000437252 A CA 000437252A CA 437252 A CA437252 A CA 437252A CA 1212162 A CA1212162 A CA 1212162A
- Authority
- CA
- Canada
- Prior art keywords
- filtering
- voltage
- changes
- fan
- filtering effect
- 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
Links
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
- B03C3/34—Constructional details or accessories or operation thereof
- B03C3/66—Applications of electricity supply techniques
-
- 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
- B03C3/72—Emergency control systems
Landscapes
- Engineering & Computer Science (AREA)
- Automation & Control Theory (AREA)
- Filtering Of Dispersed Particles In Gases (AREA)
- Electrostatic Separation (AREA)
- Sampling And Sample Adjustment (AREA)
Abstract
Abstract The present invention refers to a method for sensing changes in the filtering effect of filtering devices (2) for separation of contaminations from gaseous streams with indication of the changes by means of signal emittance. The invention further refers to a device for carrying out the method. To achieve a considerably more sensitive sensing function,changes in voltage-between filtering means (5) of the filtering device (2) are sensed, and signals are emit-ted when a certain change in voltage takes place. A simple and reliable device to carry out the method includes a con-trol circuit (9) in which resonance voltage from filter cells (5) of the filtering device (2), influence signal emitting comparators (15-18) for emittance of light, sound and control signals in dependance upon changes in voltage between the filter cells (5).
Description
Liz The present invention refers to a method for sensing changes in the filtering effect of filtering devices for separation of contaminations from gaseous streams with indications of the changes by means of signal remittance. The invention further refers to a device for carrying out the method in question.
Sensing principles known in the art to sense the degree of filling the filter of air filtering devices are not sufficiently sensitive which means that the filtering device is allowed to be filled with contaminations to a relatively high degree before a signal is emitted. This means that the filtering device at times runs with a reduced filtering effect.
The object of the present invention has been to eliminate this problem and to achieve a method by means of which a considerably more sensitive sensing function is obtained. The object of the invention has further been to provide a simple and reliable device to carry out the method according to the invention.
The present invention provides a device for sensing changes in the filtering effect of a filter means and for providing an indication of changes in the filtering effect comprising:
a) filtering cells for separating contaminants from a gaseous stream, b) fan means for moving the gaseous stream through said filter means, c) means for detecting a voltage level between said filtering cells, d) means for emitting signals responsive to the voltage level, e) means for activating an indicating means responsive to the emitted signals, and f) means for deactivating said fan when the emitted signals fall outside of a predetermined range.
,, The present invention also provides a method of sensing changes in the filtering effect of a filter means and providing an indication of changes in the filtering effect comprising:
a) providing a motor driven fan for moving a gaseous stream, b) providing filtering cells for separating contaminant from the gaseous stream, c) sensing a voltage level between said filtering cells, do emitting signals responsive to the voltage level, e) energizing an indicating means responsive to the emitted signals, and f) stopping said fan motor when the emitted signals fall outside of a predetermined range.
The invention will now be explained with reference to the enclosed drawings in which:-Figure 1 schematically shows a filtering device with a device according to the invention;
Figure 2 schematically shows a voltage field;
Figure 3 illustrates a circuit diagram of a coupling forming part of the device according to the invention.
The device illustrated in the drawing consists of a voltage transformer 1 and filtering device l for separation of contaminations from gas, preferably harmful substances from smoke from welding apparatuses. The filtering device 2 comprises an automatically driven fan 3 and one or several removable filters 4 including filtering cells 5. The fan 3 is intended to suck in contained air 6 in an ionized sector 7 of the filtering lo I
device 2, where contained particles in the air stream are charged positive to bring forth that these particles will be deposited on the filter cells 5, which are of negative charge.
With a continuing deposit of particles on the filter S cells 5 the capability of the latter to receive more particles increases such that the filtering effect of the filtering device will be unsatisfactory aster some time of use.
In order to indicate a reduced filtering function before the filtering device 2 is allowed to continue with a reduced filtering effect for a too long time or before the filtering effect further decreases to an unacceptable level, the filter cell 5 is supervised by a sensing and signal emitting device 3. This one has an electronic control circuit g (see figure 3) with inputs 10 and 11 for indicating the voltage (the so called resonance voltage) between the filter cells 5. By normal filtering effect the voltage between the filter cells 5 is within the interval llQ-240V (see figure 2) and the input resonator 9 does not give any voltage to buzzer 12 and lamp 13 but continues to give voltage to a relay to the motor of the fan 3. If the voltage sinks below Levi or raises over 124V by filling of the filter cells 5 with contaminations and/or by short circuit effects in thy filter cells 5, caused by damages on collector plates thereof (not shown) and/or as a consequence ox disruption of ionizing cords (not shown) in the ionized sector 7, the following takes place:
Jo .
Voltage Signal remittance _ 108,5 constant buzzer sound - constant light contractor to fan motor breaks within for example 12 seconds 108,5 loo intermittent buzzer sound intermittent light contractor does not break 110-124V no buzzer sound no light contractor does not break 124-125,5V intermittent buzzer sound intermittent light .
contractor does not break 125,5V constant buzzer sound lo constant light contractor to fan motor breaks within for example 12 seconds Breaking of contractor to fan motor, ire. shut off fan I is preferably late by some seconds, for example 6-20 seconds, such that the fan 3 will not stop as a consequence of temporarily passing metal objects whir temporarily reduces the voltage between the filter cells 5. If however the voltage permanently underpasses 108,5V or exceeds 125,5V the fan 3 is stopped and can only be restarted after removal or cleaning of dirty filter cells 5.
The values of the voltage/signal remittance chart above, can of course vary in dependency of the style and so forth of the parts of the sensing and signal emitting device 8 or other parts of the system.
_ 5 _ 1212~Z
The construction of the control circuit 9 can vary, but in figure 3 a practically useful and functionally correct device is illustrated. It may be mentioned that the input resonance voltage is rectified, voltage divided and filtered.
The level is regulated by means of the trimmer potentiometer 14 and constitutes a value of the purity of the filter.
The voltage is transmitted to the comparators 15 -I and reference voltages are formed by stabilized 24V from the unit 19.
The comparators 16 and 17 give signal at 124V respectively lo V since voltage and the comparators 15 and 18 give signals at 125,5 V respectively 108,5 V. The comparators 16 and 17 activate the pulse circuit 20 which feeds the buzzer 12 and trial 21, which ignites the signal lamp 13. An intermittent lo light and sound signal is obtained when one of the comparators 16 or 17 is activated.
The comparators 15 and 18 block the pulse circuit in an active condition and starts the time circuit 22 which after about 12 seconds breaks the control current to trial 23, which causes the contractor of the feed device to fall. The unit 24 works as a drive circuit for trial 23 and the resistors 25 and 26 cause a hysterias of about lo at the levels 124V
respectively Levi to give a distinct function.
The method and the device according to the invention are nut limited to the embodiments now described but may be varied within the scope of the claims. Thus, signal remittance can take place in the form of but one light signal, only sound signal, only cut off signal or any appropriate combination thereof.
Sensing principles known in the art to sense the degree of filling the filter of air filtering devices are not sufficiently sensitive which means that the filtering device is allowed to be filled with contaminations to a relatively high degree before a signal is emitted. This means that the filtering device at times runs with a reduced filtering effect.
The object of the present invention has been to eliminate this problem and to achieve a method by means of which a considerably more sensitive sensing function is obtained. The object of the invention has further been to provide a simple and reliable device to carry out the method according to the invention.
The present invention provides a device for sensing changes in the filtering effect of a filter means and for providing an indication of changes in the filtering effect comprising:
a) filtering cells for separating contaminants from a gaseous stream, b) fan means for moving the gaseous stream through said filter means, c) means for detecting a voltage level between said filtering cells, d) means for emitting signals responsive to the voltage level, e) means for activating an indicating means responsive to the emitted signals, and f) means for deactivating said fan when the emitted signals fall outside of a predetermined range.
,, The present invention also provides a method of sensing changes in the filtering effect of a filter means and providing an indication of changes in the filtering effect comprising:
a) providing a motor driven fan for moving a gaseous stream, b) providing filtering cells for separating contaminant from the gaseous stream, c) sensing a voltage level between said filtering cells, do emitting signals responsive to the voltage level, e) energizing an indicating means responsive to the emitted signals, and f) stopping said fan motor when the emitted signals fall outside of a predetermined range.
The invention will now be explained with reference to the enclosed drawings in which:-Figure 1 schematically shows a filtering device with a device according to the invention;
Figure 2 schematically shows a voltage field;
Figure 3 illustrates a circuit diagram of a coupling forming part of the device according to the invention.
The device illustrated in the drawing consists of a voltage transformer 1 and filtering device l for separation of contaminations from gas, preferably harmful substances from smoke from welding apparatuses. The filtering device 2 comprises an automatically driven fan 3 and one or several removable filters 4 including filtering cells 5. The fan 3 is intended to suck in contained air 6 in an ionized sector 7 of the filtering lo I
device 2, where contained particles in the air stream are charged positive to bring forth that these particles will be deposited on the filter cells 5, which are of negative charge.
With a continuing deposit of particles on the filter S cells 5 the capability of the latter to receive more particles increases such that the filtering effect of the filtering device will be unsatisfactory aster some time of use.
In order to indicate a reduced filtering function before the filtering device 2 is allowed to continue with a reduced filtering effect for a too long time or before the filtering effect further decreases to an unacceptable level, the filter cell 5 is supervised by a sensing and signal emitting device 3. This one has an electronic control circuit g (see figure 3) with inputs 10 and 11 for indicating the voltage (the so called resonance voltage) between the filter cells 5. By normal filtering effect the voltage between the filter cells 5 is within the interval llQ-240V (see figure 2) and the input resonator 9 does not give any voltage to buzzer 12 and lamp 13 but continues to give voltage to a relay to the motor of the fan 3. If the voltage sinks below Levi or raises over 124V by filling of the filter cells 5 with contaminations and/or by short circuit effects in thy filter cells 5, caused by damages on collector plates thereof (not shown) and/or as a consequence ox disruption of ionizing cords (not shown) in the ionized sector 7, the following takes place:
Jo .
Voltage Signal remittance _ 108,5 constant buzzer sound - constant light contractor to fan motor breaks within for example 12 seconds 108,5 loo intermittent buzzer sound intermittent light contractor does not break 110-124V no buzzer sound no light contractor does not break 124-125,5V intermittent buzzer sound intermittent light .
contractor does not break 125,5V constant buzzer sound lo constant light contractor to fan motor breaks within for example 12 seconds Breaking of contractor to fan motor, ire. shut off fan I is preferably late by some seconds, for example 6-20 seconds, such that the fan 3 will not stop as a consequence of temporarily passing metal objects whir temporarily reduces the voltage between the filter cells 5. If however the voltage permanently underpasses 108,5V or exceeds 125,5V the fan 3 is stopped and can only be restarted after removal or cleaning of dirty filter cells 5.
The values of the voltage/signal remittance chart above, can of course vary in dependency of the style and so forth of the parts of the sensing and signal emitting device 8 or other parts of the system.
_ 5 _ 1212~Z
The construction of the control circuit 9 can vary, but in figure 3 a practically useful and functionally correct device is illustrated. It may be mentioned that the input resonance voltage is rectified, voltage divided and filtered.
The level is regulated by means of the trimmer potentiometer 14 and constitutes a value of the purity of the filter.
The voltage is transmitted to the comparators 15 -I and reference voltages are formed by stabilized 24V from the unit 19.
The comparators 16 and 17 give signal at 124V respectively lo V since voltage and the comparators 15 and 18 give signals at 125,5 V respectively 108,5 V. The comparators 16 and 17 activate the pulse circuit 20 which feeds the buzzer 12 and trial 21, which ignites the signal lamp 13. An intermittent lo light and sound signal is obtained when one of the comparators 16 or 17 is activated.
The comparators 15 and 18 block the pulse circuit in an active condition and starts the time circuit 22 which after about 12 seconds breaks the control current to trial 23, which causes the contractor of the feed device to fall. The unit 24 works as a drive circuit for trial 23 and the resistors 25 and 26 cause a hysterias of about lo at the levels 124V
respectively Levi to give a distinct function.
The method and the device according to the invention are nut limited to the embodiments now described but may be varied within the scope of the claims. Thus, signal remittance can take place in the form of but one light signal, only sound signal, only cut off signal or any appropriate combination thereof.
Claims (11)
1. A device for sensing changes in the filtering effect of a filter means and for providing an indication of changes in the filtering effect, comprising:
a) filtering cells for separating contaminants from a gaseous stream, b) fan means for moving the gaseous stream through said filter means, c) means for detecting a voltage level between said filtering cells, d) means for emitting signals responsive to the voltage level, e) means for activating an indicating means responsive to the emitted signals, and f) means for deactivating said fan when the emitted signals fall outside of a predetermined range.
a) filtering cells for separating contaminants from a gaseous stream, b) fan means for moving the gaseous stream through said filter means, c) means for detecting a voltage level between said filtering cells, d) means for emitting signals responsive to the voltage level, e) means for activating an indicating means responsive to the emitted signals, and f) means for deactivating said fan when the emitted signals fall outside of a predetermined range.
2. A device of claim 1 wherein said voltage detecting means includes a means for filtering the voltage.
3. The device of claim 1 including means for continuously activating said indicating means at given voltage levels.
4. The device of claim 1 including means or intermittently activating said indicating means at given voltage levels.
5. The device of claim 1 wherein said fan deenergizing means operates only after a given time interval.
6. The device of claim 1 wherein said emitting means includes a plurality of comparator circuits, each operable at a unique voltage.
7. A method of sensing changes in the filtering effect of a filter means and providing an indication of changes in the filtering effect comprising:
a) providing a motor driven fan for moving a gaseous stream, b) providing filtering cells for separating contaminant from the gaseous stream, c) sensing a voltage level between said filtering cells, d) emitting signals responsive to the voltage level, e) energizing an indicating means responsive to the emitted signals, and f) stopping said fan motor when the emitted signals fall outside of a predetermined range.
a) providing a motor driven fan for moving a gaseous stream, b) providing filtering cells for separating contaminant from the gaseous stream, c) sensing a voltage level between said filtering cells, d) emitting signals responsive to the voltage level, e) energizing an indicating means responsive to the emitted signals, and f) stopping said fan motor when the emitted signals fall outside of a predetermined range.
8. The method of Claim 7 including filtering the voltage
9. The method of Claim 7 including continuously operating said indicating means at given voltage levels.
10. The method of Claim 7 including intermittently operating said indicating means at given voltage levels.
11. The method of Claim 7 including stopping said fan motor only after a given time interval.
7.
7.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| SE8205417A SE435577B (en) | 1982-09-22 | 1982-09-22 | VIEW TO MONITOR CHANGES OF THE FILTERING EFFECT OF FILTERING DEVICES FOR THE DISPOSAL OF GAS FLUID, SPEC Harmful Substances from Welding Gases, and Device for Implementation of Excavation |
| SE8205417-2 | 1982-09-22 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1212162A true CA1212162A (en) | 1986-09-30 |
Family
ID=20347950
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA000437252A Expired CA1212162A (en) | 1982-09-22 | 1983-09-21 | Method for sensing changes in the filtering effect of filtering devices for separation of contamination from gaseous streams and a device for carrying out the method |
Country Status (9)
| Country | Link |
|---|---|
| JP (2) | JPS5976515A (en) |
| CA (1) | CA1212162A (en) |
| DE (1) | DE3334162A1 (en) |
| DK (1) | DK431283A (en) |
| FI (1) | FI74881C (en) |
| FR (1) | FR2533140B1 (en) |
| GB (1) | GB2127556B (en) |
| IT (3) | IT8322962A0 (en) |
| SE (1) | SE435577B (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0640822B1 (en) * | 1993-08-30 | 1998-04-22 | Millipore Investment Holdings Limited | Integrity test for porous structures using acoustic emission |
| ITPN940015A1 (en) * | 1994-03-16 | 1995-09-16 | Procond Elettronica Spa | ELECTROSTATIC FILTER AIR PURIFIER |
Family Cites Families (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB1337255A (en) * | 1970-11-27 | 1973-11-14 | Secr Defence | Methods of testing adsorbent materials |
| GB1309344A (en) * | 1971-03-10 | 1973-03-07 | Bondarev V P | Device for evaluating the quality of cake in intermittent filters |
| US3754219A (en) * | 1972-01-03 | 1973-08-21 | Johnson Service Co | High impedance gaseous ion sensing and detection system |
| JPS5614644B2 (en) * | 1972-10-19 | 1981-04-06 | ||
| DE2261792C2 (en) * | 1972-12-16 | 1974-10-03 | Berckheim, Constantin Graf Von, 6940 Weinheim | Device for measuring air pollution |
| JPS5060875A (en) * | 1973-10-02 | 1975-05-26 | ||
| GB1487179A (en) * | 1974-12-12 | 1977-09-28 | Secr Defence | Method and apparatus for detecting polar vapours in gases |
| JPS5262622A (en) * | 1975-11-19 | 1977-05-24 | Mitsubishi Electric Corp | Wiring method of d.c. input power source for inverter |
| JPS53161380U (en) * | 1977-05-26 | 1978-12-18 | ||
| US4264331A (en) * | 1977-08-03 | 1981-04-28 | Johnson Controls, Inc. | Charged non-conductive polar gas sensing element and detection system |
| JPS5614644U (en) * | 1979-07-10 | 1981-02-07 |
-
1982
- 1982-09-22 SE SE8205417A patent/SE435577B/en not_active IP Right Cessation
-
1983
- 1983-09-19 FR FR8314826A patent/FR2533140B1/en not_active Expired
- 1983-09-21 DK DK431283A patent/DK431283A/en not_active Application Discontinuation
- 1983-09-21 JP JP58176128A patent/JPS5976515A/en active Pending
- 1983-09-21 FI FI833380A patent/FI74881C/en not_active IP Right Cessation
- 1983-09-21 DE DE19833334162 patent/DE3334162A1/en active Granted
- 1983-09-21 CA CA000437252A patent/CA1212162A/en not_active Expired
- 1983-09-21 GB GB08325278A patent/GB2127556B/en not_active Expired
- 1983-09-22 IT IT8322962A patent/IT8322962A0/en unknown
- 1983-09-22 IT IT22963/83A patent/IT1169842B/en active
- 1983-11-22 IT IT8324095U patent/IT215131Z2/en active
-
1988
- 1988-07-21 JP JP1988096715U patent/JPH0353700Y2/ja not_active Expired
Also Published As
| Publication number | Publication date |
|---|---|
| IT8322963A0 (en) | 1983-09-22 |
| FI833380A (en) | 1984-03-23 |
| IT1169842B (en) | 1987-06-03 |
| GB8325278D0 (en) | 1983-10-26 |
| DE3334162A1 (en) | 1984-03-22 |
| DK431283A (en) | 1984-03-23 |
| GB2127556B (en) | 1987-08-26 |
| DE3334162C2 (en) | 1989-11-09 |
| DK431283D0 (en) | 1983-09-21 |
| IT215131Z2 (en) | 1990-08-20 |
| IT8322962A0 (en) | 1983-09-22 |
| IT8324095V0 (en) | 1983-11-22 |
| SE8205417D0 (en) | 1982-09-22 |
| FR2533140A1 (en) | 1984-03-23 |
| JPS5976515A (en) | 1984-05-01 |
| JPS6436024U (en) | 1989-03-06 |
| FI833380A0 (en) | 1983-09-21 |
| FI74881C (en) | 1988-04-11 |
| FI74881B (en) | 1987-12-31 |
| GB2127556A (en) | 1984-04-11 |
| FR2533140B1 (en) | 1988-06-10 |
| JPH0353700Y2 (en) | 1991-11-25 |
| SE435577B (en) | 1984-10-08 |
| IT8322963A1 (en) | 1985-03-22 |
| SE8205417L (en) | 1984-03-23 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| MKEX | Expiry |