CN112756111A - Air filter device with static elimination function - Google Patents
Air filter device with static elimination function Download PDFInfo
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- CN112756111A CN112756111A CN202011474367.9A CN202011474367A CN112756111A CN 112756111 A CN112756111 A CN 112756111A CN 202011474367 A CN202011474367 A CN 202011474367A CN 112756111 A CN112756111 A CN 112756111A
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- 238000003379 elimination reaction Methods 0.000 title claims abstract description 38
- 230000003068 static effect Effects 0.000 title claims abstract description 38
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- 239000000463 material Substances 0.000 claims abstract description 16
- 239000012717 electrostatic precipitator Substances 0.000 claims abstract description 14
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- 150000002500 ions Chemical class 0.000 claims description 26
- CBENFWSGALASAD-UHFFFAOYSA-N Ozone Chemical compound [O-][O+]=O CBENFWSGALASAD-UHFFFAOYSA-N 0.000 claims description 20
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 claims description 14
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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
- B03C3/02—Plant or installations having external electricity supply
- B03C3/04—Plant or installations having external electricity supply dry type
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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
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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
- B03C3/40—Electrode constructions
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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
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- Engineering & Computer Science (AREA)
- Automation & Control Theory (AREA)
- Elimination Of Static Electricity (AREA)
Abstract
The invention relates to the technical field of electrostatic protection and electronic process equipment, and provides an air filtering device with an electrostatic elimination function, which comprises an air source, a filtering unit and an electric dust collection and static elimination system which are sequentially arranged along the airflow direction, wherein the air source is used for providing the power for the air to flow; the filtering unit is used for physically intercepting foreign matters in the air; the electrostatic precipitation static-removing system is used for further performing corona precipitation and static elimination on the air passing through the filtering unit; the electrostatic precipitator static-removing system is arranged at the downstream of the air flow direction of the filter unit. The invention improves the physical interception of pure filter materials into the combination of filter material physical interception and electrostatic precipitation technology, improves the dust removal efficiency and effect, and simultaneously realizes the removal of static electricity.
Description
Technical Field
The invention relates to the technical field of electrostatic protection and electronic processing equipment, in particular to an air filtering device with an electrostatic elimination function.
Background
In the precision manufacturing process of the electronic industry, the cleanliness of static electricity and space environment needs to be controlled. Static electricity in an environmental space generally comes from several aspects: (1) when the air filtering device is used for purifying air, the air passes through the filtering material to filter dust, and meanwhile, the air is charged with static electricity due to friction between the air and the filtering material, so that the air is released to an operation space; (2) in the industrial operation process, static electricity is generated in a plurality of processes, such as: and tearing off the protective film and the like. Generally, static electricity elimination is realized by erecting a static electricity eliminator at a station; cleanliness of the space environment is accomplished by an air filtration unit placed on top. The current situation is that the air filtration unit is mainly composed of two parts, the first part is a fan for supplying air or other air sources; the second part is a physical filtering unit composed of glass fiber and other filtering materials. The static eliminator is usually installed at a station position and is a device such as an ion fan, and the current layout has the problems that the static eliminator such as the ion fan occupies the space position of a production line, and the internal devices such as a wind source bring troubles such as vibration and airflow disturbance, so that the airflow disturbance of a one-way flow dust-free chamber is caused. The problem that air filter unit exists is that when wind passed insulating material such as glass fibre, the static electrification phenomenon can be brought in the friction to the wind that blows off has very strong polarity, is unfavorable for the static management and control in space. In addition, the efficient air filtering unit has large wind resistance and large operation power consumption.
Disclosure of Invention
The technical problem to be solved by the invention is as follows: in order to overcome the defects in the prior art, the invention provides an air filtering device with a static electricity eliminating function.
The technical scheme adopted for solving the technical problems is as follows: an air filtering device with a static electricity eliminating function comprises an air source, a filtering unit and an electric dust collecting and static electricity eliminating system which are sequentially arranged along an air flow direction, wherein the air source is used for providing air flowing power and comprises but is not limited to a fan; the filter unit is made of an insulating filter material and is used for physically intercepting foreign matters in the air; the electric dust collection static electricity removal system is used for further physically filtering and eliminating static electricity of the air passing through the filtering unit; the electrostatic precipitator static-removing system is arranged at the downstream of the air flow direction of the filtering unit, and has the static-removing function and the dust filtering function; because the electrostatic precipitator system undertakes a part of dust removal work, the dust removal pressure of the upstream filter unit can be reduced, the density of the upstream filter unit can be reduced, the cost is reduced, and the power of the fan is reduced. The invention improves the physical interception of a pure filter material into the filter material physical interception and corona dust collection technology, improves the dust removal efficiency and effect and simultaneously realizes the removal of static electricity.
The static electricity removing principle of the electrostatic precipitation static electricity removing system is that a high-voltage power supply is adopted to release equal amounts of positive and negative ions to an environment space, the environment space is ensured to be always in an electrically neutral state, and if more than static electricity exists, the static electricity can be consumed. The equivalent positive and negative ions are released through the discharge electrode and the high-voltage discharge power supply, and theoretically, the equivalent positive and negative ions can be released as long as the positive and negative high-voltage power supply and the positive and negative electrodes are the same; however, the physical characteristics of positive and negative discharges and the difference between the discharge electrodes cause different positive and negative discharge efficiencies, so that the number of positive and negative ions in the space is unequal. If operated for a long time, this will result in the accumulation of ions of a certain polarity, and therefore, the positive and negative ions generated need to be monitored to ensure the electrical neutrality of the space charge. The invention adopts the collecting plate to collect the discharging current at the air outlet, forms a potential on the collecting plate, monitors the potential through the circuit, thereby monitoring space charge, calculates the potential change in a certain time domain range, and adjusts the discharging efficiency of the positive and negative high-voltage power supplies through the adjusting circuit so as to ensure the equivalent quantity of the positive and negative charges.
According to the analysis, the electrostatic precipitation and removal system specifically comprises a corona discharge dust collection unit, a collection plate, a detection circuit, a regulating circuit and a high-voltage power supply, wherein the high-voltage power supply is connected with the corona discharge dust collection unit and used for releasing equivalent positive and negative ions; in order to ensure the electric neutral effect of corona discharge, a corresponding ion balance detection device, namely an acquisition board, is arranged at the lower side of the air outlet, and the acquisition board is arranged at the downstream of the airflow direction of the corona discharge dust collection unit and is used for acquiring discharge current and forming a voltage signal on the acquisition board; the detection circuit is connected with the acquisition board to detect the magnitude of the voltage signal; the adjusting circuit is respectively connected with the detecting circuit and the high-voltage power supply and used for adjusting the output of the high-voltage power supply according to the voltage signal so as to keep the positive and negative ions in the space balanced. Wherein the high voltage power supply comprises a positive high voltage power supply and a negative high voltage power supply.
Further, the corona discharge dust collection unit comprises an electrode assembly and a current-sharing grounding plate, wherein the current-sharing grounding plate is arranged at the upstream and/or the downstream of the electrode assembly, the electrode assembly is connected with a high-voltage power supply, and the current-sharing grounding plate is grounded with the high-voltage power supply. The quantity and the positions of the current-equalizing grounding plates can be set according to specific requirements, and can be arranged at the upstream of the electrode assembly or at the downstream of the electrode assembly, and the current-equalizing grounding plates at the upstream can conduct away and shield static electricity generated by insulating and filtering materials such as glass fibers and the like; the downstream flow equalizing grounding plate realizes the guiding function of a reference electrode for positive and negative corona discharge and positive and negative ions.
The corona dust collection technology is not a single electrode, but positive and negative coronas are uniformly distributed, and neutral ionic groups can be generated while corona dust collection is completed; the design of corona discharge module contains positive and negative corona discharge structure, and the primary structure is line (needle) -dielectric plate-line (needle) structure, and this structure can avoid taking place arc discharge, promotes discharge voltage, improves dust collection efficiency and produces more ions.
Specifically, the electrode assembly comprises an insulating frame, a plurality of discharge electrodes and insulating partition plates, the plurality of discharge electrodes are arranged on the insulating frame in parallel, the insulating partition plates are arranged between adjacent discharge electrodes for separation, and the discharge electrodes are sequentially and alternately connected with the positive pole and the negative pole of the high-voltage power supply to form a structure in which the positive discharge electrode and the negative discharge electrode are alternately arranged.
Specifically, the discharge electrodes comprise a plurality of conductive copper rods and a plurality of discharge rods, and the discharge rods are uniformly distributed along the length direction of the conductive copper rods. The discharge rods are electrically communicated with the conductive copper rods, and when the conductive copper rods are connected with a power supply, all the discharge rods on the conductive copper rods have the same polarity, so that discharge charges can be generated.
Preferably, in order to facilitate assembly and connection of a power supply, a discharge electrode connected to a positive high voltage power supply is fixed to one side of the insulating frame to form a discharge anode; and a discharge electrode connected with the negative high-voltage power supply is fixed on the other side of the insulating frame to form a discharge cathode.
Further, the detection circuit comprises an amplifier U1, resistors R1, R2 and R3, and capacitors C1, C2, C3 and C4, wherein an inverting INPUT end of the amplifier U1 is connected in series with a resistor R1 and then serves as an INPUT end INPUT1 of a voltage signal collected on a collecting plate, and the capacitor C1 is connected between the voltage signal INPUT end INPUT1 and ground GND; the capacitor C2 is connected in parallel between the inverting input end and the output end of the amplifier U1, and the output end of the amplifier U1 is connected in series with the resistor R3 and then serves as a voltage signal output end Vout of the converted acquisition board; the resistor R2 is connected in parallel between the inverting input end of the amplifier U1 and the voltage signal output end Vout; the capacitor C3 is connected between the negative power supply-Vcc of the amplifier U1 and ground GND, and the capacitor C4 is connected between the positive power supply + Vcc of the amplifier U1 and ground GND.
Further, the adjusting circuit comprises a Buck voltage-reducing chip U11, a digital potentiometer adjusting chip U12, an inductor L1, a diode D1, capacitors C5, C6, C7, C8 and C9, an adjustable resistor RP1 and a resistor R4, wherein a voltage signal on the collecting plate is connected to a signal input pin VIN of the Buck voltage-reducing chip U11 through an output end Vout, the capacitor C9 is connected between the signal input pin VIN of the Buck voltage-reducing chip U11 and ground GND, a signal pin BOOT of the Buck voltage-reducing chip U11 is sequentially connected in series with the capacitor C5 and the inductor L1 and then is connected to a negative high-voltage power supply HV-, a cathode of the diode D1 is connected to a common end of the capacitor C5 and the inductor L1, and an anode of the diode D; a signal pin PH of the Buck voltage reduction chip U11 is connected to the common end of the diode D1 and the inductor L1; the capacitors C6, C7 and C8 are connected in parallel between the negative high-voltage power supply HV and the ground GND; one end of the resistor R4 is connected with a negative high-voltage power supply HV-, and the other end of the resistor R4 is connected with the adjustable resistor RP1 in series and then connected with a signal pin VL of the digital potentiometer adjusting chip U12; the adjusting end of the adjustable resistor RP1 is connected to the common end of the resistor R4 and the adjustable resistor RP 1; the common end of the resistor R4 and the adjustable resistor RP1 is used as a feedback voltage regulator port VSENSE and is connected to a signal pin VSNS of the Buck voltage reduction chip U11 for feeding back a reference voltage value; an end signal pin VH and a middle tap signal pin VW of the digital potentiometer adjusting chip U12 are grounded GND; the counting signal pin INC, the counting direction signal pin U/D and the chip selection signal pin CS of the digital potentiometer adjusting chip U12 are respectively connected with the I/O pins PC0, PC1 and PB5 of the control unit, and the control and adjustment of the resistance value of the digital potentiometer adjusting chip U12 are realized through the control unit.
Specifically, the current-sharing ground plate comprises a current-sharing net, an insulating frame is arranged at the edge of the current-sharing net, and a mounting hole is formed in the insulating frame.
Further, the electrostatic precipitator also comprises an ozone elimination unit which is arranged in the downstream direction of the airflow of the electrostatic precipitator static elimination system.
Specifically, the ozone elimination unit is an ozone elimination layer made of an ozone elimination material, and a plurality of vent holes which are arranged in a longitudinal and transverse mode are formed in the ozone elimination layer; and the side surface of the edge of the ozone elimination layer is provided with a mounting hole.
The invention has the beneficial effects that: the device adds electrostatic precipitator system that destatics in the filter unit low reaches, and electrostatic precipitator destatics system is integrated static elimination and corona discharge collection dirt's function, can solve a plurality of problems in the current processing procedure simultaneously:
1. the dust collection and static elimination can be realized at the same time; the static electricity is eliminated, and meanwhile, the dust filtering function is also realized, so that the pressure of an upstream filtering unit can be reduced, and the service life of the filtering unit is prolonged; the filter material density of the upstream filter unit can be reduced, so that the power of the fan is reduced;
2. the corona discharge dust collection unit can effectively adsorb 0.1-5 um of foreign matters and effectively reduce the thickness of the filter material, thereby reducing wind resistance, reducing use power, saving energy and reducing consumption;
3. the corona discharge dust collection unit adopts an electrode-dielectric plate-electrode structure to form neutral corona ionic wind, and the ionic balance degree of the neutral corona ionic wind is effectively adjusted through a monitoring and adjusting device, so that a stable space static suppression system is constructed without vibration and airflow disturbance;
4. the corona discharge can effectively decompose toxic and harmful gases in an electronic workshop, and ensure the breathing safety of personnel;
5. an ozone elimination layer is added at the final output end of the air outlet, so that the output neutral corona discharge ion wind is clean and free of ozone, and the health of personnel is protected.
Drawings
The invention is further illustrated by the following figures and examples.
FIG. 1 is a schematic view of the overall assembly of the air filtration unit of the present invention.
Fig. 2 is an exploded view of the overall structure of the air filtration device of the present invention.
FIG. 3 is a schematic view of an electrostatic precipitator-destaticizing system.
Fig. 4 is a schematic view of a corona discharge and dust collection unit.
Fig. 5 is a schematic view of the structure of the electrode assembly.
Fig. 6 is a schematic view of the structure of the discharge electrode.
Fig. 7 is an enlarged schematic view of a structure at a in fig. 6.
Fig. 8 is a schematic structural diagram of a current equalizing ground plate.
FIG. 9 is a schematic view of the structure of the ozone eliminating unit.
Fig. 10 is a circuit schematic of the detection circuit.
Fig. 11 is a circuit schematic of the regulating circuit.
In the figure: 1. the device comprises a wind source, 11, a mounting frame, 2, an electrode assembly, 21, an insulating frame, 22a, a discharge anode, 22b, a discharge cathode, 221, a conductive copper rod, 222, a discharge rod, 23, an insulating partition plate, 24, a lead, 3, a filtering unit, 4a, an upper side flow equalizing grounding plate, 4b, a lower side flow equalizing grounding plate, 41, a flow equalizing net, 42, an insulating frame, 43, a mounting hole, 5, a collecting plate, 6, an ozone eliminating unit, 61, a vent hole, 62, a mounting hole, 7, a positive high-voltage power supply, 8, a negative high-voltage power supply, 9, a regulating circuit, 10 and a detection circuit.
Detailed Description
The present invention will now be described in detail with reference to the accompanying drawings. This figure is a simplified schematic diagram, and merely illustrates the basic structure of the present invention in a schematic manner, and therefore it shows only the constitution related to the present invention.
As shown in fig. 1 and fig. 2, the air filtering device with static electricity eliminating function of the present invention comprises an air source 1, a filtering unit 3, an electrostatic precipitation and removal system and an ozone eliminating unit 6, which are sequentially arranged along an air flow direction, wherein the air source 1 is used for providing air flow power, and the device as the air source 1 includes but is not limited to a fan, and a mounting frame 11 is arranged at an edge of an air outlet of the fan for mounting and fixing other components; the filter unit 3 is made of an insulating filter material and is used for physically intercepting foreign matters in the air; the electrostatic precipitation static elimination system is used for further performing corona precipitation and static elimination on the air passing through the filter unit 3; the electrostatic precipitator system is arranged at the downstream of the filter unit 3 in the airflow direction; the ozone eliminating unit 6 is arranged in the downstream direction of the air flow of the electrostatic precipitation and removal system for ensuring that the output neutral corona discharge ion wind does not contain ozone.
As shown in fig. 3, the electrostatic precipitator system comprises a corona discharge dust collecting unit, a collecting plate 5, a detecting circuit 10, a regulating circuit 9 and a high voltage power supply, wherein the high voltage power supply is connected with the corona discharge dust collecting unit for releasing equal amounts of positive and negative ions; in order to ensure the electric neutral effect of corona discharge, a corresponding ion balance detection device, namely an acquisition plate 5, is arranged at the lower side of the air outlet, and the acquisition plate 5 is arranged at the downstream of the airflow direction of the corona discharge dust collection unit and is used for acquiring discharge current and forming a voltage signal on the acquisition plate 5; the detection circuit 10 is connected with the acquisition board 5 to detect the magnitude of the voltage signal; the adjusting circuit 9 is respectively connected with the detecting circuit 10 and the high-voltage power supply, and is used for adjusting the output of the high-voltage power supply according to the voltage signal so as to keep the positive and negative ions in the space balanced. Wherein the high voltage power supply comprises a positive high voltage power supply 7 and a negative high voltage power supply 8.
As shown in fig. 4, the corona discharge dust collecting unit includes an electrode assembly 2 and a current equalizing grounding plate, the current equalizing grounding plate is disposed at the upstream and/or downstream of the electrode assembly 2, the electrode assembly 2 is connected with a high voltage power supply, and the current equalizing grounding plate is grounded with the high voltage power supply. The number and the positions of the current-sharing grounding plates can be set according to specific requirements, and can be arranged at the upstream of the electrode assembly 2 or at the downstream of the electrode assembly 2, in the embodiment, two current-sharing grounding plates are preferably adopted, namely an upper current-sharing grounding plate 4a and a lower current-sharing grounding plate 4b, the electrode assembly 2 is arranged between the upper current-sharing grounding plate 4a and the lower current-sharing grounding plate 4b, and the upper current-sharing grounding plate 4a realizes the conduction and the shielding of static electricity generated by insulating and filtering materials such as glass fibers; the lower flow equalizing grounding plate 4b realizes the guiding function of the reference electrode and positive and negative ions for positive and negative corona discharge. The corona discharge dust collecting unit is provided with odd negative electrodes from left to right and even positive electrodes; the three layers are fixedly connected through screws to form an integral module.
The upper flow equalizing grounding plate 4a and the lower flow equalizing grounding plate 4b have the same structure and comprise a flow equalizing net 41, an insulating frame 42 is arranged at the edge of the flow equalizing net 41, and a mounting hole 43 is formed in the insulating frame 42.
The corona dust collection technology is not a single electrode, but positive and negative coronas are uniformly distributed, and neutral ionic groups can be generated while corona dust collection is completed; the design of corona discharge module contains positive and negative corona discharge structure, and the primary structure is line (needle) -dielectric plate-line (needle) structure, and this structure can avoid taking place arc discharge, promotes discharge voltage, improves dust collection efficiency and produces more ions.
As shown in fig. 5, the electrode assembly 2 includes an insulating frame 21, a plurality of discharge electrodes and insulating separators 23, the insulating frame 21 is provided with a plurality of discharge electrodes in parallel, the insulating separators 23 are provided between adjacent discharge electrodes for separation, and the discharge electrodes are sequentially and alternately connected to the positive high voltage power supply 7 and the negative high voltage power supply 8, so as to form a structure in which the positive and negative discharge electrodes are alternately arranged. In order to facilitate assembly and connection of the power supply, the discharge electrodes connected to the positive high-voltage power supply 7 in this embodiment are fixed to the left side of the insulating frame 21, and all the discharge electrodes are connected in parallel to the positive high-voltage power supply 7 through the lead wires 24 to form a discharge positive electrode 22 a; the discharge electrode connected to the negative high-voltage power supply 8 is fixed to the right side of the insulating frame 21, and all the discharge electrodes are connected in parallel to the negative high-voltage power supply 8 through a lead wire 24 to form a discharge cathode 22 b.
As shown in fig. 6 and 7, the discharge electrode includes a discharge positive electrode 22a and a discharge negative electrode 22b, which have the same structure, and includes a plurality of conductive copper rods 221 and discharge rods 222, and the discharge rods 222 are uniformly distributed along the length direction of the conductive copper rods 221. The discharging rods 222 are electrically connected with the conductive copper rod 221, and when the conductive copper rod 221 is connected with a power supply, all the discharging rods 222 on the conductive copper rod are of the same polarity, so that discharging charges can be generated. The shape of the conductive copper bar 221 includes, but is not limited to, a cylindrical shape, a prismatic shape, and the like. The discharge rod 222 is made of an oxidation-resistant material such as titanium alloy, and the shape of the discharge rod 222 is set to a needle-shaped structure with a thin tip.
As shown in fig. 9, the detection circuit 10 includes an amplifier U1, resistors R1, R2, R3, and capacitors C1, C2, C3, and C4, an inverting INPUT terminal of the amplifier U1 is connected in series with the resistor R1 and then serves as an INPUT terminal INPUT1 of the voltage signal collected on the collecting board 5, and the capacitor C1 is connected between the voltage signal INPUT terminal INPUT1 and ground GND; the capacitor C2 is connected in parallel between the inverting input end and the output end of the amplifier U1, and the output end of the amplifier U1 is connected in series with the resistor R3 and then serves as a voltage signal output end Vout of the converted acquisition board 5; the resistor R2 is connected in parallel between the inverting input end of the amplifier U1 and the ion signal output end Vout; the capacitor C3 is connected between the negative power supply-Vcc of the amplifier U1 and ground GND, and the capacitor C4 is connected between the positive power supply + Vcc of the amplifier U1 and ground GND. Preferably, the amplifier U1 is an ultra low input current amplifier such as LMP7721/AD 549.
The working principle of the detection circuit 10 is as follows: the ion signal collected on the collecting plate 5 passes through a capacitor C1 to filter the high frequency wave of the ion signal, and then goes to an electrostatic voltage collecting circuit with an amplifier U1 as a core. The capacitors C2 and R3 are suppression circuits for avoiding self-oscillation of the amplifier U1, and the capacitors C3 and C4 are filter capacitors of a positive power supply and a negative power supply of the amplifier U1 chip respectively, so that signal interference of the power supply is avoided. The resistors R1 and R2 form an inverse proportional operational amplifier circuit, and the INPUT voltage signal INPUT1 is applied to the inverse INPUT terminal of the operational amplifier through the resistor R1. Resistor R2 is the channel that communicates between the output and the input, and is the feedback network of the circuit. Collected ion signals are converted into voltage signals through a depth voltage parallel negative feedback circuit formed by an amplifier U1, and the amplification factor is-R2/R1 INPUT.
As shown in fig. 10, the adjusting circuit 9 includes a Buck voltage reducing chip U11, a digital potentiometer adjusting chip U12, an inductor L1, a diode D1, capacitors C5, C6, C7, C8, and C9, an adjustable resistor RP1, and a resistor R4, wherein a voltage signal on the collecting board 5 is connected to a signal input pin VIN of the Buck voltage reducing chip U11 through an output terminal Vout, the capacitor C9 is connected between the signal input pin VIN of the Buck voltage reducing chip U11 and a ground GND, a signal pin BOOT of the Buck voltage reducing chip U11 is connected to a negative high voltage power source HV "after being connected in series with the capacitor C5 and the inductor L1 in sequence, a cathode of the diode D1 is connected to a common terminal of the capacitor C5 and the inductor L1, and an anode of the diode GND; a signal pin PH of the Buck voltage reduction chip U11 is connected to the common end of the diode D1 and the inductor L1; the capacitors C6, C7 and C8 are connected in parallel between the negative high-voltage power supply HV and the ground GND; one end of the resistor R4 is connected with a negative high-voltage power supply HV-, and the other end of the resistor R4 is connected with the adjustable resistor RP1 in series and then connected with a signal pin VL of the digital potentiometer adjusting chip U12; the adjusting end of the adjustable resistor RP1 is connected to the common end of the resistor R4 and the adjustable resistor RP 1; the common end of the resistor R4 and the adjustable resistor RP1 is used as a feedback voltage regulator port VSENSE and is connected to a signal pin VSNS of the Buck voltage reduction chip U11 for feeding back a reference voltage value; an end signal pin VH and a middle tap signal pin VW of the digital potentiometer adjusting chip U12 are grounded GND; the counting signal pin INC, the counting direction signal pin U/D and the chip selection signal pin CS of the digital potentiometer adjusting chip U12 are respectively connected with the I/O pins PC0, PC1 and PB5 of the control unit, and the control and adjustment of the resistance value of the digital potentiometer adjusting chip U12 are realized through the control unit.
The operating principle of the regulating circuit 9 is: u11 is Buck step-down converter circuit chip, and U12 is digital potentiometer adjusting chip. In this embodiment, the Buck voltage reduction chip U11 adopts, for example, UC3842, TPS40054, and the like, and the digital potentiometer adjustment chip U12 adopts, for example, X9511. The resistor network part of the digital potentiometer adjusting chip U12 has three terminals, VL, VW and VH respectively, wherein VH and VL are two terminals of the potentiometer, and VW is a center tap of the potentiometer. The control unit is realized by a single chip microcomputer, and the single chip microcomputer controls the part: PC0 is connected to pin INC of chip U12, PC1 is connected to pin U/D of chip U12, and PB5 is connected to pin CS of chip U12. Wherein INC is input of counting pulse, and counting can be triggered at the falling edge of the pulse during operation; U/D is an input signal for controlling the counting direction, and the pin is in high level and is in up counting, and the pin is in low level and is in down counting; CS is chip selection signal input, when the pin is at low level, a counter in the device receives counting pulse and counts, when the pin is at high level, the counter in the device does not work and maintains current output, and at the moment, the potentiometer is locked; in this example, when CS is low level, INC is a falling edge pulse, and at this time U/D is high level, the potentiometer resistance is increased; when CS is low, INC is a falling edge pulse, and at this time U/D is low, the potentiometer resistance is reduced.
The capacitor C9 is a decoupling capacitor at the input end, and the capacitor can provide a more stable power supply, and simultaneously can reduce the noise of the element coupled to the power supply end, and indirectly can reduce the influence of the noise of the element on other elements; the capacitor C5 is a bootstrap capacitor in the Buck chip U11. When the built-in MOS tube is in a conducting state, the capacitor C5 is lifted to supply power to the inside of the chip; when the built-in MOS tube is in the off state, HV-charges the capacitor C5 through the built-in diode. The inductor L1, the capacitors C6, C7 and C8 are output voltage stabilizing and filtering units, and output voltage stability is guaranteed. D1 is a clamping diode, the withstand voltage of which is larger than the maximum rated value of the power supply of the system, and the continuous flow of the MOS driving tube in the Buck voltage reduction chip is ensured when the MOS driving tube is not conducted. VSENSE is a feedback voltage regulator port. PH is the source of the high-bias power MOSFET inside the chip, and is externally connected between an inductor L1 and a diode D1. The resistors R4 and RP1 and the digital potentiometer adjusting chip U12 form a voltage adjusting circuit, VSENSE at the connection point of the R4 and the RP1 is fed back to the voltage input end of the Buck voltage-reducing chip U11, and the voltage at the VSENSE is used as a reference voltage, namely 0-bit voltage. The HV-voltage passes through a feedback regulation loop of resistors R4 and RP1, a digital potentiometer regulation chip U12 and a ground GND. When the detection circuit 10 detects that the signal on the acquisition board 5 is different from the 0-bit VSENSE voltage signal, the digital potentiometer adjusting chip U12 changes the input feedback voltage fed back to the Buck voltage reduction chip U11 by adjusting the resistance change of the digital potentiometer adjusting chip U12, when the voltage is not equal to the reference voltage VREF1.22V, the HV-output is adjusted by changing the duty ratio of the PWM wave output inside the Buck voltage reduction chip U11, and the voltage of the acquisition board 5 is always in a balanced state through the automatic closed-loop negative feedback adjusting circuit 9.
In the present embodiment, the reference value of VSENSE is 1.22V at normal time, and when the resistance value of RP 1/digital potentiometer U12 changes, the reference value of VSENSE also changes, which is not equal to 1.22V. At the moment, the PWM duty ratio in the chip is adjusted through a differential amplification circuit in the buck conversion circuit chip, and the change of HV-output is ensured to be in accordance with VSENSE standard to be 1.22V through outputting S source stage of an internal MOSFET to a PH end.
In light of the foregoing description of preferred embodiments in accordance with the invention, it is to be understood that numerous changes and modifications may be made by those skilled in the art without departing from the scope of the invention. The technical scope of the present invention is not limited to the contents of the specification, and must be determined according to the scope of the claims.
Claims (10)
1. An air filter device with static elimination function, characterized in that: the electrostatic precipitator comprises an air source, a filtering unit and an electrostatic precipitator system which are sequentially arranged along the airflow direction, wherein the air source is used for providing the power for the air flow; the filtering unit is used for physically intercepting foreign matters in the air; the electrostatic precipitation static-removing system is used for further performing corona precipitation and static elimination on the air passing through the filtering unit; the electrostatic precipitator static-removing system is arranged at the downstream of the air flow direction of the filter unit.
2. The air filter device with electrostatic elimination of claim 1, wherein: the electrostatic precipitation and destaticization system comprises a corona discharge dust collection unit, a collection plate, a detection circuit, an adjusting circuit and a high-voltage power supply, wherein the high-voltage power supply is connected with the corona discharge dust collection unit and used for releasing equal positive and negative ions, and the collection plate is arranged at the downstream of the corona discharge dust collection unit in the airflow direction and used for collecting discharge current and forming a voltage signal on the collection plate; the detection circuit is connected with the acquisition board to detect the magnitude of the voltage signal; the adjusting circuit is respectively connected with the detecting circuit and the high-voltage power supply and used for adjusting the output of the high-voltage power supply according to the voltage signal so as to keep the positive and negative ions in the space balanced.
3. The air filter device with electrostatic elimination of claim 2, wherein: the corona discharge dust collection unit comprises an electrode assembly and a current-sharing grounding plate, wherein the current-sharing grounding plate is arranged at the upstream and/or the downstream of the electrode assembly, the electrode assembly is connected with a high-voltage power supply, and the current-sharing grounding plate is grounded with the high-voltage power supply.
4. The air filter device with electrostatic elimination of claim 3, wherein: the electrode assembly comprises an insulating frame, a plurality of discharge electrodes and insulating partition plates, the plurality of discharge electrodes are arranged on the insulating frame in parallel, the insulating partition plates are arranged between every two adjacent discharge electrodes for separation, and the discharge electrodes are sequentially and alternately connected with a positive high-voltage power supply and a negative high-voltage power supply to form a structure in which the positive discharge electrodes and the negative discharge electrodes are alternately arranged.
5. The air filter device with electrostatic elimination of claim 4, wherein: the discharge electrode comprises a plurality of conductive copper rods and a plurality of discharge rods, and the discharge rods are uniformly distributed along the length direction of the conductive copper rods.
6. The air filter device with electrostatic elimination of claim 2, wherein: the detection circuit comprises an amplifier U1, resistors R1, R2 and R3, capacitors C1, C2, C3 and C4, wherein an inverting INPUT end of the amplifier U1 is connected with a resistor R1 in series and then serves as an INPUT end INPUT1 of a voltage signal collected on a collecting plate, and the capacitor C1 is connected between the voltage signal INPUT end INPUT1 and ground GND; the capacitor C2 is connected in parallel between the inverting input end and the output end of the amplifier U1, and the output end of the amplifier U1 is connected in series with the resistor R3 and then serves as a voltage signal output end Vout of the converted acquisition board; the resistor R2 is connected in parallel between the inverting input end of the amplifier U1 and the voltage signal output end Vout; the capacitor C3 is connected between the negative power supply-Vcc of the amplifier U1 and ground GND, and the capacitor C4 is connected between the positive power supply + Vcc of the amplifier U1 and ground GND.
7. The air filter device with electrostatic elimination of claim 6, wherein: the adjusting circuit comprises a Buck voltage-reducing chip U11, a digital potentiometer adjusting chip U12, an inductor L1, a diode D1, capacitors C5, C6, C7, C8, C9, an adjustable resistor RP1 and a resistor R4, wherein a voltage signal on an acquisition board is connected to a signal input pin VIN of the Buck voltage-reducing chip U11 through an output end Vout, the capacitor C9 is connected between the signal input pin VIN of the Buck voltage-reducing chip U11 and the ground GND, a signal pin BOOT of the Buck voltage-reducing chip U11 is sequentially connected in series with the capacitor C5 and the inductor L1 and then is connected to a negative high-voltage power supply HV-, a cathode of the diode D1 is connected to a common end of the capacitor C5 and the inductor L1, and an anode of the; a signal pin PH of the Buck voltage reduction chip U11 is connected to the common end of the diode D1 and the inductor L1; the capacitors C6, C7 and C8 are connected in parallel between the negative high-voltage power supply HV and the ground GND; one end of the resistor R4 is connected with a negative high-voltage power supply HV-, and the other end is connected with the adjustable resistor RP1 in series and then connected to an end signal pin VL of the digital potentiometer adjusting chip U12; the adjusting end of the adjustable resistor RP1 is connected to the common end of the resistor R4 and the adjustable resistor RP 1; the common end of the resistor R4 and the adjustable resistor RP1 is used as a feedback voltage regulator port VSENSE and is connected to a signal pin VSNS of the Buck voltage reduction chip U11 for feeding back a reference voltage value; an end signal pin VH and a middle tap signal pin VW of the digital potentiometer adjusting chip U12 are grounded GND; the counting signal pin INC, the counting direction signal pin U/D and the chip selection signal pin CS of the digital potentiometer adjusting chip U12 are respectively connected with the I/O pins PC0, PC1 and PB5 of the control unit, and the control and adjustment of the resistance value of the digital potentiometer adjusting chip U12 are realized through the control unit.
8. The air filter device with electrostatic elimination of claim 2, wherein: the flow equalizing ground plate comprises a flow equalizing net, an insulating frame is arranged on the edge of the flow equalizing net, and mounting holes are formed in the insulating frame.
9. The air filter device with electrostatic elimination of claim 1, wherein: the electrostatic precipitator is characterized by further comprising an ozone elimination unit, wherein the ozone elimination unit is arranged in the downstream direction of the airflow of the electrostatic precipitator static elimination system.
10. The air filter device with electrostatic elimination of claim 9, wherein: the ozone elimination unit is an ozone elimination layer made of an ozone elimination material, and a plurality of vent holes which are arranged in a longitudinal and transverse mode are formed in the ozone elimination layer; and the side surface of the edge of the ozone elimination layer is provided with a mounting hole.
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| CN202011474367.9A CN112756111A (en) | 2020-12-14 | 2020-12-14 | Air filter device with static elimination function |
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| CN202011474367.9A CN112756111A (en) | 2020-12-14 | 2020-12-14 | Air filter device with static elimination function |
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