CN2665584Y

CN2665584Y - Electrostatic air purifying device with ozone reduction

Info

Publication number: CN2665584Y
Application number: CN 03256122
Authority: CN
Inventors: 詹沛宇
Original assignee: Individual
Current assignee: Individual
Priority date: 2003-07-30
Filing date: 2003-07-30
Publication date: 2004-12-22
Anticipated expiration: 2013-07-30

Abstract

The utility model relates to an air purifying device which mainly comprises a dust removing capacitor of which two sets of pole plates are both metal plates, two or three active carbon filter nets which are arranged in a dust removing chamber in a 7 shape or a Z shape and can deacidize O 3, an electronic control circuit which can control a blower and the current supply of a high voltage generating circuit in a manauto mode, and the high voltage generating circuit which can only provide about 4KV high voltage for the dust removing capacitor. The air purifying device has the advantages of good air purifying effect, high efficiency, right generated anion amount and low manufacturing cost, belongs to the technical field of environment protection and electronic circuits, and is especially appropriate for hospitals, offices, theaters and other locations where the air pollution is serious to purify the air of the hospitals, the offices, the theaters and other locations.

Description

Electrostatic air purifier with ozone reduction

Technical Field

The utility model relates to an air purification device belongs to technical field such as environmental protection, high pressure emergence and electronic control circuit.

Background

An existing air purification device mainly comprises a shell, a pre-filtering net, a dust removal capacitor, a dust collection box, an activated carbon filtering net, a fan and the like, during operation, the fan rotates to force dirty air to flow in from an air inlet on the shell, the dirty air sequentially flows through the above parts, the parts are filtered, most of dust particles and odor and toxic gas contained in the dirty air are collected and adsorbed, most of bacteria contained in the dirty air flow are killed, negative ions are injected into the dirty air flow, the air flow flowing out from an air outlet on the shell is sterile, the dust particles, the odor and the toxic gas are low in content, and the purified air flow containing the negative ions is formed. The background art has the following disadvantages: one electrode of the dust removal capacitor is a fine metal wire and is easy to break; the large voltage (8KV) is too high to supply power to the dust removal capacitor, so that excessive negative ions are generated, and the health of product users is not favorable; the activated carbon filter screen does not adsorb negative ions; the dust collecting function of the activated carbon filter screen is not utilized, and the dust collecting box is arranged, so that the production cost of the product is increased; the active carbon filter screen is adopted, so that the effective adsorption of the odor and the toxic gas is difficult to ensure, and the screen surface of the filter screen is parallel to the front panel of the shell, so that the arrangement is unreasonable, and the adsorption of the odor and the toxic gas is not facilitated; and no automatic mode of operation.

Disclosure of Invention

The utility model aims to provide an air purification device who does not have the shortcoming of background art.

Another object of the present invention is to provide an electronic control and high voltage generating circuit suitable for the device of the present invention.

Drawings

FIG. 1 is a schematic structural diagram of an air purification device according to the present invention, wherein 1 is a housing, 2Is an activated carbon filter screen (I), 3 is O₃The device comprises a reduced activated carbon filter screen (II), an air inlet 4, a pre-filter screen 5, a dust collecting chamber 6, a dust removing capacitor 7, a fan speed regulating switch 8 (S3), an ash cleaning indicator 9, a manual-automatic selection switch 10 (S2), a manual-automatic indicator 11, a power switch 12 (S1), an electronic control circuit printed board 13, a high-voltage generation circuit printed board 14, a fan 15, an impeller 16 and a pin hole 17.

Fig. 2 is a cross-sectional view of dust removing capacitor 7 at X-X, where 18 is a positive electrode plate group, 19 is an insulating holder, 20 is a negative electrode plate group, and 21 is a negative electrode terminal.

Fig. 3 is a schematic structural view of an activated carbon filter (I)2 and an activated carbon filter (II)3, in which 22 is a frame, 23 is a wire mesh, and 24 is a fibrous activated carbon.

FIG. 4 is a circuit diagram of the electronic control circuit of the present invention, wherein R1-R6 are resistors, C1-C3 are capacitors, D1, D4 and D5 are diodes, D2 is a bicolor light emitting tube, D3 is a Zener diode, IC is a time-base integrated circuit, FS is a fuse, S1 is a power switch, S2 is a manual-automatic selection switch, S3 is a fan speed regulation switch, and A-G are terminals.

Fig. 5 is a circuit diagram of a safety switch circuit, in which S4 is a safety switch, CT is a power plug, and a 'and F' are terminals.

Fig. 6 is a circuit diagram of the fan 15, where M is a rotor of the fan 15, L1 and L2 are stator windings of the fan 15, and C 'to E' are terminals.

FIG. 7 is a circuit diagram of a high voltage generating circuit, wherein R7~ R10 are resistors, C4~ C6 are capacitors, D7~ D8 are diodes, D9 is a high voltage rectifier tube, Q3 is a thyristor, T is a high frequency transformer, B ' and E ' ~ F ', H are wiring ends.

FIG. 8 is a circuit diagram of dust removing capacitor 7, in which 25 is a positive contact, 2 is a negative contact, and F 'and H' are terminals.

Detailed Description

The utility model relates to an air purification device mainly comprises shell (1), pre-filter net (5), dust collecting chamber (6), dust removal electric capacity 7, activated carbon filter screen (I)2, activated carbon filter screen (II)3, fan 15, impeller 16, electronic control circuit printing board 13 and high voltage generating circuit printing board 14 are constituteed, are equipped with electronic control circuit and high voltage generating circuit on electronic control circuit printing board 13 and the high voltage generating circuit printing board 14 respectively.

The front panel of the shell 1 is provided with an air inlet 4, a top cover (not shown) is provided with an air outlet above the impeller 16, the top cover is also provided with holes for panel components (a machine speed-adjusting switch (S3)8, an ash cleaning indicator 9, a manual-automatic selection switch (S2)10, a manual-automatic indicator 11 and a power switch (S1)12 to penetrate out, a double-core power line penetrates out from a small hole on the side panel, a safety switch S4 is arranged below a pin hole 17, a plastic pin is attached to the top cover, when the top cover is covered, the plastic pin passes through the pin hole 17 to touch and press the button of the safety switch S4, the safety switch S4 is closed, the device can be powered by an alternating current power supply, when dust is removed or maintained, the top cover is detached, the plastic pin does not touch and press the safety switch 4, the safety switch S4 is disconnected, the connection between the device and the alternating current power supply is automatically cut off, and the safety protection effect is achieved for users or maintenance personnel.

The dust collecting chamber 6 is a hollow pipeline with a rectangular cross section and enclosed by the machine shell 1 and the top cover, two ends of the dust collecting chamber are respectively aligned with the air inlet 4 and the impeller 16, and a pre-filter screen 5, a dust removing capacitor 7, an activated carbon filter screen (I)2 and an activated carbon filter screen (II)3 are sequentially arranged in the dust collecting chamber.

The pre-strainer 5 is a large mesh strainer intended to keep large, light and small objects such as down, hair, and quarrel from entering the device.

The dust removal capacitor 7 mainly comprises a positive plate group 18, a negative plate group 20, an insulating support 19 and a negative plate terminal 21. The positive electrode plate group 18 and the negative electrode group 20 are made of a metal plate such as brass, aluminum or tinplate, and are respectively provided with five pole plates and four pole plates, and the size of each pole plate is 25cm (length) × 3cm (width) × 0.5 mm-1 mm (thickness). The positive plate group 18 is composed of odd number (the lowest plate is the first plate, and the rest is the same) pole plates (five plates in total) which are connected by a lead, the lead connecting the first and the ninth plate is a metal plate which is made of the same material as the pole plates, and the plate is the positive terminal of the dust removalcapacitor 7. The negative electrode plate group 20 is composed of an even number of electrode plates (four plates in total) connected by a lead. The insulating support 19 is made of an insulating material such as bakelite, glass fiber laminate, plastic, organic glass, or ceramic, and is fixed to both ends of the first and ninth plates with screws. The insulating support 19 is provided with slits for the nine plates to be mounted, so as to ensure that the distance between each pair of adjacent positive and negative plates of the assembled dust removal capacitor 7 is 12 mm. The width of the slot is slightly larger than the thickness of the plate. The negative terminal 21 is a copper nut which fastens a copper screw with the diameter of 4-6 rat to the insulating support 19, and a lead is in jumping connection between the copper screw and the negative plate group 20. The medium between positive electrode plate group 18 and negative electrode plate group 20 is air. The dust removing capacitor 7 is connected to the positive terminal and the negative terminal of the high voltage power supply generated by the high voltage generating circuit through a positive terminal-a positive contact piece 25-a terminal F "-a terminal F 'and a negative terminal 21-a negative contact piece 28-a terminal H' -a terminal H, respectively. When the high-voltage power supply works, the voltage of the high-voltage power supply for supplying power to the dust removal capacitor 7 is only minus 3.5KV to minus 4.5KV, and the field intensity of an electric field existing between two groups of polar plate groups of the dust removal capacitor 7 is small, so that only a small part of oxygen in air passing through the electric field is converted into ozone, in other words, negative ions generated by the electric field in the dust removal capacitor 7 are few. In addition, the two groups of pole plates of the dust removal capacitor 7 also have the function of adsorbing fine dust particles carried by the air flow.

The activated carbon filter screen (I)2 and the activated carbon filter screen (II)3 are composed of fiber activated carbon 24, iron wire nets 23 (two pieces) and clamping frames 22 (two pieces), and the two clamping frames 22 clamp the two iron wire nets 23 with the fiber activated carbon 24 and then are buckled and clamped together. The activated carbon filter screen (I)2 and the activated carbon filter screen (II)3 can be 7 or

The active carbon filter screen 2 is placed in the dust chamber 6 in a shape, and the thickness of the active carbon 24 is increased as if the active carbon filter screen is placed obliquely for the air flow, which is beneficial to improving the adsorption efficiency of the filter screen. In order to further improve the adsorption efficiency, one activated carbon filter screen can be added, and three filter screens are Z orThe shape is placed in the dust chamber 6. The surfaces of the fiber activated carbon 24 of all the filter nets are treated by coating caustic soda solution with the concentration of 10-20%. The surface of the activated carbon 24 is treated by coating with a caustic soda solution with a concentration of 10-20%. The filter screen has the following three functions: the surface of the fibrous activated carbon 24 blocks dust particles in the air stream; the fiber activated carbon 24 adsorbs toxic gases and odors in the air flow; the surface coating of the fibrous activated carbon 24 adsorbs negative ions in the air stream, and the reaction equation is:

the fan 15 is an alternating current motor comprising two stator windings L1 and L2, when the alternating current motor works, only one stator winding is connected with an alternating current power supply, the fan 15 drives the impeller 16 to rotate, air flows flowing infrom the air inlet 4, flowing out through the pre-filter screen 5, the dust removal capacitor 7, the activated carbon filter screen (I)2, the activated carbon filter screen (II)3 and the air outlet are formed, the stator winding connected with the alternating current power supply is changed, the rotating speed of the fan 15 can be changed, and the flow rate of the air flows is changed accordingly.

The utility model relates to an electronic control circuit mainly by resistance R1~ R6, electric capacity C1~ C3, diode D1, D4, D5, double-colored luminotron D2, zener diode D3, luminotron D8, bidirectional thyristor Q1, transistor Q2, time base integrated circuit IC, fuse FS, switch S1~ S4, power plug CT, the two-core power cord, wiring end A ~ G and A ', F' are constituteed, can divide into safety switch circuit, switch, fuse circuit, low pressure power supply circuit, timing circuit, bidirectional thyristor switch circuit, manual-automatic circuit, parts such as deashing indicating circuit, except safety switch circuit, all install on electronic control circuit printed board 13. The safety switch circuit includes a power plug CT, a two-wire power cord, a switch S4 (safety switch S4) and terminals a ', F'. Two ends of the power plug are respectively connected with two core wires at one end of a double-core power line, two core wires at the other end of the double-core power line are respectively connected with one end of a switch S4 and a terminal F ', the other end of a switch S4 is connected with a terminal A', and the terminals A 'and F' are respectively connected with a terminal A, F through long wires. Switch S4 is a single pole, single throw microswitch. The power switch, fuse circuit includes switch S1 (power switch a1), fuse FS, terminal A, B. The switch S1 is connected in series with the fuse FS and then jumped across the terminal A, B. Switch S1 is a single pole, single throw, lock button switch with fuse FS rated at 0.5A. The low-voltage power supply circuit comprises a resistor R2, capacitors C1-C2, a diode D4 and a Zener diode D3. The resistor R2 is connected in parallel with the capacitor C1 and then bridged between the terminal B and the anode of the diode D4, the cathode of the diode D4 is connected with the cathode of the Zener diode D3, the anode of the Zener diode D3 is grounded, the terminal F is grounded, and the anode and the cathode of the capacitor C2 are respectively connected with the cathode of the Zener diode D3 and the ground wire. The resistor R2 is a metal film resistor with the resistance value and the power of 470K and 1/4W respectively, the capacitor C1 is a terylene capacitor with the capacity and the withstand voltage of 47 mu and 400V respectively, the capacitor C2 is an aluminum electrolytic capacitor with the capacity and the withstand voltage of 100 mu and 16V respectively, the model of the diode D4 is 4004, and the Zener diode D3 is a Zener diode with the breakdown voltage and the power of 7-9V and 1/2W respectively. The timing circuit comprises resistors R3-R4, a capacitor C3, a diode D5 and a time base integrated circuit IC. The pins 4 and 8 of the time base integrated circuit IC are connected together and connected to the cathode of the diode D4, the pin 1 of the time base integrated circuit IC is grounded, the

pins

2 and 6 of the time base integrated circuit IC are connected together, the anode and the cathode of the diode D5 are respectively connected with the

pins

7 and 2 of the time base integrated circuit IC, the resistor R4 is jumped between the

pins

7 and 2 of the time base integrated circuit IC, the anode and the cathode of the capacitor C3 are respectively connected with the pin 2 of the time base integrated circuit IC and the ground wire, and the resistor R3 is jumped between the cathode of the diode D4 and the pin 7 of the time base integrated circuit IC. The resistors R3 and R4 are metal film resistors with the resistance value and the power of 1M and 1/4W respectively, the capacitor C3 is a tantalum electrolytic capacitor with the capacity and the withstand voltage of 47 mu and 16V respectively, the model of the diode D5 is 2CK1, and the model of the time base integrated circuit IC is 7555. The triac switching circuit includes a resistor R6 and a triac Q1. The MT2 and MT1 poles of triac Q1 are connected to terminals E and F, respectively. The resistor R6 is connected across the MT2 and MT1 poles of the triac Q1 to terminals E and F, respectively. The resistor R6 is bridged between the gate of the bidirectional thyristor Q1 and the pin 3 of the time-base integrated circuit IC, the resistor R6 is a metal film resistor with the resistance value and the power of 100 omega and 1/4W respectively, and the rated current and the withstand voltage of the bidirectional thyristor Q1 are 1A and 400V respectively. The manual-automatic circuit comprises a resistor R1, a diode D1, a two-color light-emitting tube D2, a switch S2 (a manual-automatic selection switch S2) and switches S2-1 and S2-2. The anode of the diode D1 is connected with the terminal B, the cathode of the diode D1 is connected with one end of the resistor R1, the other end of the resistor R1 is connected with the switch of the switch S2-2, the two anodes of the two-color light-emitting tube D2 are respectively connected with the two throws of the switch S2-2, the cathode of the two-color light-emitting tube D2 is connected with the terminal E, the switch of the switch S2-1 is connected with the one throw of the switch S2-1 and then connected with the terminal F, and the other throw of the switch S2-1 is connected with the terminal E. The resistor R1 is a metal film resistor with the resistance value and the power of 47K and 1W respectively, the model of the diode D1 is 4004, the two-color light emitting tube D2 is a two-color light emitting tube with the diameter of a tube bulb of 5mm, and the switch S2 is a double-pole double-throw locking type button switch. The ash cleaning indicating circuit comprises a resistor R5, a light-emitting tube D6 anda transistor Q2. The resistor R5 is connected in a jumper manner between the cathode of the diode D4 and the anode of the light-emitting tube D6, the cathode of the light-emitting tube D6 is connected to the collector of the transistor Q2, the emitter of the transistor Q2 is grounded, and the base of the transistor Q2 is connected to the terminal G. The resistor R5 is a metal film resistor having a resistance value and a power of 1K and 1/4W, respectively, the light emitting tube D6 is a light emitting tube having a bulb diameter of 5mm, and the transistor Q2 is 9014 in type. The control objects of the electronic control circuit are that the fan 15 and the high-voltage generating circuit control the voltage of the fan 15 to be output from terminals C-E, the voltage of the high-voltage generating circuit to be output from a terminal B, E, and the ash cleaning control special voltage from the high-voltage generating circuit to be input from a terminal G, F.

The controlled fan circuit includes two stator windings L1, L2, terminals C 'to E' of the fan 15. The common ends of the two stator windings L1 and L2 are connected with a terminal E ', the other ends of the two stator windings L1 and L2 are respectively connected with terminals C ' and D ', and the terminals C ' to E ' are respectively connected with the terminals C to E by long wires. The rated current of the stator winding L2 is greater than the rated current of the stator winding L1.

The controlled high-voltage generating circuit comprises resistors R7-R10, capacitors C4-C6, a high-frequency transformer T, diodes D7-D9, silicon controlled rectifier Q3, wiring terminals B ', E ', C ' and H, and the components are all mounted on the high-voltage generating circuit printed board 14. An anode and a cathode of a thyristor Q3 are respectively connected with a cathode and an anode of a diode D7, a resistor R7 is respectively connected between an anode of the thyristor Q3 anda terminal B ', a capacitor C5 is connected between a gate and a cathode of the thyristor Q3, a cathode and an anode of a diode D8 are respectively connected with a terminal E' and a cathode of the thyristor Q3, a resistor R8 is connected between a terminal E 'and a gate of the thyristor Q3 in a bridging manner, a capacitor C4 is connected in series with a primary coil of a high-frequency transformer T and then connected between an anode and a cathode of the thyristor Q3, one end of the primary coil of the high-frequency transformer T is connected with a cathode of a diode D9, an anode of a diode D9 is connected with a terminal H, a resistor R9 is connected in parallel with a capacitor C6 and then connected between the other end of a secondary coil of the high-frequency transformer T and the ground, a terminal F' is grounded, a resistor, the terminals B 'and E' to G 'are respectively connected with the terminals B, E to G through long leads, the terminal H, F' is respectively connected with the terminal H 'on the negative contact piece 26 and the terminal F' on the positive contact piece 25 through the long leads, the dust removal capacitor 7 is powered through the negative contact piece 26 and the positive contact piece 25, and the voltage is minus 3.5KV to minus 4.5 KV. The resistor R7 is a metal film resistor with the resistance value and the power of 3.6K and 1W respectively, the resistors R9 and R10 are metal film resistors with the resistance value and the power of 470K and 1/4W respectively, the capacitor C4 is a terylene capacitor with the capacity and the withstand voltage of 0.47 mu and 400V respectively, the capacitors C5 and C6 are terylene capacitors with the capacity and the withstand voltage of 0.01 mu and 63V respectively, the high-frequency transformer T is a line output transformer of a silver sheep 12' black-and-white television produced by a television component factory in the market, the diodes D7 and D8 are 4004 respectively, the diode D9 is a CG rectifier tube with the model of 22, and thethyristor Q3 is a thyristor with the rated current and the withstand voltage of 0.5A and 400V respectively.

When the power plug CT is plugged into a power socket, the device can be supplied with power from an alternating current power supply because the device is covered with the top cover and the safety switch S4 is closed. The power switch (S1)12 is pressed to open and close the lock, and the device is operated by the power supply.

An alternating current power supply is transmitted to the input end of a low-voltage power supply circuit through a terminal A, F, a closed power switch (S1)12 and a fuse FS, the rectification function of a diode D4, the current limiting and voltage dividing functions of a resistor R2 and a capacitor C1, the voltage stabilizing function of a Zener diode D3 and the filtering function of a capacitor C2 enable the low-voltage power supply circuit to output a diameter voltage of 7-9V at the output end (two ends of the capacitor C2), and the positive end and the negative end of the capacitor C2 are respectively the positive end and the negative end of the voltage. The voltage value of this voltage is the breakdown voltage value of the zener diode D3. And setting the output direct current voltage of the low-voltage power supply circuit as E.

The time base integrated circuit IC works because pins 4, 8 and 1 are spanned at two ends of a direct current voltage E and are supplied with power. Assuming that the terminal voltage of the capacitor C3 is slightly lower than 1/3E, the pin 3 outputs E and keeps outputting E, the on-chip electronic switch between pin 7 and pin 1 is turned off and keeps turning off, the capacitor C3 is charged through the resistor R3 and the diode D5 which is turned on, and the terminal voltage rises until it is slightly higher than 2/3E, the time base integrated circuit IC switches state: the 3-pin outputs 0 and keeps outputting 0, the on-chip electronic switch is closed and keeps closed, the capacitor C3 discharges through the resistor R4 and the closed on-chip electronic switch, and the terminal voltage of the capacitor C3 drops until the terminal voltage is slightly lower than 1/3E. The timing circuit now returns to the situation at the beginning of the discussion, after which the timing circuit repeats the above process over and over. In short, 3-pin outputs a symmetric rectangular signal, and the period T thereof can be represented by the following formula:

T≈(R3+R4)C3/1.5

substituting R3-R4-1M and C3-47 mu into the formula to obtain

T ≈ 60 seconds

The manual operation mode is selected without pressing the manual-automatic selection switch (S2) 10. The switch of S2-2 is connected with the right throw, the diode D1, the resistor R1 and the right half part of the double-color light-emitting tube D2 (manual-automatic indicator 11) are connected in series and then are connected across the AC power supply, the rectification function of the diode D1 and the current-limiting function of the resistor R1 enable the right half part of the double-color light-emitting tube D2 to obtain a forward voltage of 1.6V in the positive half cycle of the AC power supply, the right half part of the double-color light-emitting tube D2 emits green light, the light is emitted 50 times per second, the device looks like continuous light, and the device is in a manual working mode; the switch S2-1 is connected with the upper throw, the MT2 and MT1 poles of the bidirectional controllable silicon Q1 are connected, the MT2-MT1 circuit of the bidirectional controllable silicon Q1 is equivalent to be normally connected, and the output signal of the pin 3 of the time-base integrated circuit IC has no control effect on the bidirectional controllable silicon Q1. When the speed regulation switch (S3)8 of the fan is not pressed, the switch blade of the switch is connected with the lower throw, the voltage (alternating current 220V) of the fan is controlled to be output from a terminal D, E and applied to a stator winding L2, and the fan 15 rotates at full speed; the fan speed control switch (S3)8 is pressed, the switch blade and the upper throw are connected, the locking action keeps them connected, the control voltage is applied to the stator winding L1, and the fan 15 rotates at half speed because the rated current flowing through the stator winding L1 is small. The voltage (ac 220V) controlling the high voltage generating circuit is output from terminal B, E and applied to the high voltage generating circuit via terminals B ', E'. When the terminal B 'is positive to the terminal E', the ac power source charges the capacitor C4 through the resistor R7, the primary winding of the high-frequency transformer T, and the conducting diode D8, so that the terminal voltage of the capacitor C4 rises to the positive peak value of the ac power source, i.e., 220 × 1.4 is 308V, and the left plate and the right plate of the capacitor C4 are positive and negative. When terminal B 'is negative with respect to terminal E', the ac power source charges capacitor C5 through resistor R7, capacitor C4, the primary winding of high frequency transformer T, and resistor R8. Diodes D7 and D8 are reverse biased and their effect is not taken into account. The terminal voltage of the capacitor C5 rises, and the upper plate and the lower plate of the capacitor C5 are positive and negative, respectively. Since the charging current is extremely small, the terminal voltage of the capacitor C4 hardly decreases. When the negative half cycle of the alternating current power supply is about to end, the terminal voltage of the capacitor C5 rises to the gate ignition voltage of the controllable silicon Q3, the controllable silicon Q3 is conducted, the capacitor C4 discharges to the primary coil of the high-frequency transformer T through the conducted controllable silicon Q3, and high-frequencydamping oscillation current is excited between the capacitor C4 and the primary coil of the high-frequency transformer T. Diode D7 provides a path for reverse (bottom-up) current. The high-frequency transformer T converts the high-frequency voltage of about 300V at the two ends of the primary coil into the high-frequency voltage of about 3.5-4.5 KV at the two ends of the secondary coil, and the high-frequency voltage is rectified by a high-voltage rectifying tube D9 to obtain the high voltage of-3.5-4.5 KV and is output from a terminal H. High voltage is applied to the dust removal capacitor 7, and an electric field is formed between the two sets of the grading plates. The electric field has two functions: adsorbing fine dust particles carried by air flow flowing through an electric field on the polar plate; part of oxygen in the air flow is converted into ozone, namely negative ions are injected into the air flow, and the high voltage is not high and is only-3.5 KV to-4.5 KV, so that the electric field is not strong, and the number of the negative ions injected into the air flow is not large.

The automatic operation mode is selected by pressing the manual-automatic selection switch (S2)10, and the switch is locked. The switch of the switch S2-1 is connected with the lower throw, and the control signal sent to the gate pole of the bidirectional thyristor Q1 by the pin 3 of the time base integrated circuit IC through the resistor R6 controls the on and off of the MT2-MT1 circuit of the bidirectional thyristor Q1; during thirty seconds when the output signal of the pin 3 of the time base integrated circuit IC is E, the MT2-MT1 circuit is conducted, and the fan 15 and the high-voltage generating circuit work due to power supply; during thirty seconds when the output signal is 0, the MT2-MT1 circuit is turned off, and the fan 15 and the high voltage generation circuit stop operating because the power cannot be detected. The switch of the switch S2-2and the left half part of the left-throw-on double-color light-emitting tube D2 also intermittently emit yellow light; the device is lighted for thirty seconds and is extinguished for thirty seconds, which shows that the device is in an automatic working mode.

The ash cleaning indicating circuit is powered from the output end of the low-voltage power supply circuit to work; when the dust accumulation between the two polar plates of the dust removal capacitor 7 is less, no current flows through the resistor R9, no voltage drop exists on the resistor R9, the base-emitting bias voltage of the transistor Q2 is 0, the transistor Q2 is cut off, no current flows through the light emitting tube D6 (ash removal indicator 9), and the light emitting tube D6 does not emit light; when the dust accumulation between the two groups of electrode plates of the dust removal capacitor 7 is large, the dust accumulation is equivalent to a resistor which is spanned between the terminals H and F', the resistor and the resistor R9 form a voltage divider, the divided voltage on the resistor R9 becomes the base emission bias voltage of the transistor Q2, the transistor Q2 is conducted, and the light-emitting tube D6 emits infrared light to remind a user of clearing the dust accumulation. The resistor R5 is used to reduce the excess voltage, so that the large forward voltage of the light-emitting tube is 1.6V.

Compared with the prior art, the utility model relates to a device has following advantage:

1. the polar plates of the dust removal capacitor 7 are all metal plates, so that the service life is prolonged;

2. the power supply voltage of the dust removal capacitor 7 is low, and negative ions generated by an electric field are few; the activated carbon filter screen (I)2 and the activated carbon filter screen (II)3 can absorb negative ions, so that the content of the negative ions in the purified air output by the device is proper;

3. two or three activated carbon filter screens are adopted, one of the activated carbon filter screens is obliquely arranged, so that the filtering and adsorbing effects are good, and the efficiency is high;

4. the dust collecting box is not contained, and the production cost is low;

5. can be operated in a manual-automatic manner.

Therefore, the device of the utility model is particularly suitable for being used in places with serious air pollution, such as hospitals, offices, theaters and toilets, so as to purify the air therein and improve the environment therein, and is an important environmental protection product with large potential market and worth popularizing and implementing.

Claims

1. An air purification device mainly comprises a shell (1), a pre-filtering net (5), a dust collecting chamber (6), a dust removing capacitor (7), an activated carbon filtering net (2), an activated carbon filtering net (3), a fan (15), an impeller (16), an electronic control circuit printed board (13) and a high-voltage generating circuit printed board (14), and is characterized in that the dust removing capacitor (7) is an empty space with two groups of polar plates which are metal platesThe air capacitor, the activated carbon filter screen (2) and the activated carbon filter screen (3) are fiber activated carbon with the surface treated by coating caustic soda solution, the concentration of the caustic soda solution is 10 to 20 percent and is used for reducing O₃The electronic control circuit printed board (13) is provided with a large electronic control circuit which can control the fan (15) and the high-voltage generating circuit to supply power in a manual-automatic mode, and the high-voltage generatingcircuit printed board (14) is provided with a high-voltage generating circuit which supplies power to the dust removal capacitor (7).

2. An air cleaning device according to claim 1, characterized in that the dust-removing circuit capacitor (7) is mainly composed of a positive plate group (18), a negative plate group (20), an insulating support (19) and a negative terminal (21), the positive plate group (18) and the negative plate group (20) are both made of metal plate material such as brass, aluminum or tinplate, the positive plate group (18) and the negative plate group (20) respectively comprise five plates and four plates, the plates have a size of 25cm x 3cm x 0.5 mm-1 mm, the positive plate group (18) is composed of odd plates connected by wires, the wires connecting the first and ninth plates are metal plates of the same material as the plates, the plates are positive terminals of the dust-removing capacitor (7), the negative plate group (20) is composed of even plates connected by wires, the insulating support (19) is made of insulating material such as bakelite, glass fiber laminate, plastic, organic glass or ceramic, the insulation support (19) is provided with a seam which is used for installing the nine pole plates and ensures that the distance between each pair of adjacent positive plates and negative plates of the assembled dust removal capacitor (7) is 12mm, the width of the seam is slightly larger than the thickness of the pole plates, a negative terminal (21) is a copper nut which fastens a copper screw which has the diameter of 4-6 mm and is communicated with a negative plate group (20) through a lead to the insulation support (19), and a medium between the positive plate group (18) and the negative plate group (20) is air.

3. The air cleaning device according to claim 1, wherein the voltage of the high voltage generating circuit supplying power to the dust removing capacitor 7 is-3.5 KV to-4.5 KV.

4. The air cleaning device according to claim 1, wherein the activated carbon filter net (2) and the activated carbon filter net (3) are made of fiber activated carbon (24), wire netting 23 and a clamping frame (22), and the two clamping frames (22) clamp the two wire netting (23) bundled with the fiber activated carbon (24) and then are fastened together.

5. The air cleaning device according to claim 1, wherein the activated carbon filter net (3) and the activated carbon filter net (2) can be placed in the dust collecting chamber (6) in a shape of "7" or "" and an activated carbon filter net can be added and placed in the dust collecting chamber (6) in a shape of "Z" or "" as well.

6. An electronic control circuit, characterized in that, by the resistance (R1 ~ R6), the capacitance (C1 ~ C3), the diode (D1, D4, D5), the double-colored luminotron (D2), Zener diode (D3), luminotron (D6), the two-way thyristor (Q1), the transistor (Q2), the time base Integrated Circuit (IC), the Fuse (FS), the switch (S1 ~ S4), the power plug (CT), the two-core power line, the terminal (A ~ G) and (A ', F') make up, characterized in that the circuit mainly includes the safety switch circuit, the power switch, the fuse circuit, the low voltage supply circuit, the timing circuit, the two-way thyristor switch circuit, the manual one automatic circuit, the deashing indicates the circuit, etc., the circuit (except the safety switch circuit) is safe on the electronic control circuit printed board (13), the safety switch circuit includes the power plug (CT), a two-core power line, a switch (S4) and terminals (A ', F'), two ends of a power plug (CT) are respectively connected with two core wiresat one end of the two-core power line, two core wires at the other end of the two-core power line are respectively connected with one end of a switch (S4) and a terminal (F '), the other end of the switch (S4) is connected with the terminal (A'), the terminals (A ', F') are respectively connected with the terminal (A, F) by long wires, the switch (S4) is a single-pole single-throw microswitch, the power switch and a fuse circuit comprise a switch (S1), a Fuse (FS) and a terminal (A, B), the switch (S1) is connected with the Fuse (FS) in series and then jumped at two ends of the terminal (A, B), the switch (S1) is a single-pole single-throw locking button switch, the rated current of the Fuse (FS) is 0.5A, a low-voltage power supply circuit comprises a resistor (R2), capacitors (C1-C2), a diode (D4) and a Zener diode (D3), wherein a resistor (R2) is connected in parallel with a capacitor (C1) and then bridged between a terminal (B) and the anode of the diode (D4), the cathode of the diode (D4) is connected with the cathode of the Zener diode (D3), the anode of the Zener diode (D3) is grounded, a terminal (F) is grounded, the anode and the cathode of the capacitor (C2) are respectively connected with the cathode and the ground of the Zener diode (D3), the resistor (R2) is a metal film resistor with the resistance value and the power of 470K and 1/4W respectively, the capacitor (C1) is a terylene capacitor with the capacity and the withstand voltage of 47 mu and 400V respectively, the capacitor (C2) is a Zener capacitor with the capacity and the withstand voltage of 100 mu and 16V respectively, the aluminum electrolytic diode (D4) is 4004, and the Zener diode (D3) is a Zener diode with the breakdown voltage and the power of 7V and 1/2, the timing circuit comprises resistors (R3-R4), a capacitor (C3), a diode (D5), a time-base Integrated Circuit (IC), wherein pins 4 and 8 of the time-base Integrated Circuit (IC) are connected together and connected to the cathode of the diode (D4), pin 1 of the time-base IntegratedCircuit (IC) is grounded, pins 2 and 6 of the time-base Integrated Circuit (IC) are connected together, the anode and the cathode of the diode (D5) are respectively connected with pins 7 and 2 of the time-base Integrated Circuit (IC), a resistor (R4) is jumped between pin 1 of the time-base Integrated Circuit (IC) and grounded, pins 2 and 6 of the time-base Integrated Circuit (IC) are connected together, the cathode and the cathode of the diode (D5) are respectively connected with pins 7 and 2 of the time-base Integrated Circuit (IC), the resistor (R4) is jumped between pin 7 and pin 2 of the time-base Integrated Circuit (IC), the anode and the cathode of the capacitor (C3) are respectively connected with pin 2 of the time-base Integrated Circuit (IC) and, the resistor (R3) is bridged between the cathode of the diode (D4) and the 7 feet of the time-base Integrated Circuit (IC), the resistors (R3 and R4) are both metal film resistors with the resistance value and the power of 1M and 1/4W respectively, the capacitor (C3) is a tantalum electrolytic capacitor with the capacity and the withstand voltage of 47 mu and 16V respectively, the model of the diode (D5) is 2CK1, the model of the time-base Integrated Circuit (IC) is 7555, the bidirectional thyristor switch circuit comprises the resistor (R6), the bidirectional thyristor (Q1), the bidirectional thyristors (Q1) and (MT2) and (MT1) are respectively connected with the terminals (E) and (F), the resistor (R6) is bridged between the gate of the bidirectional thyristor (Q1) and the 3 feet of the time-base Integrated Circuit (IC), the resistor (R6) is a metal film resistor with the resistance value and the power of 100 omega and 1/4W respectively, the withstand voltage of the bidirectional thyristor (Q1) and the rated current of 400V 1A and 400V respectively, a manual-automatic circuit comprises a resistor (R1), a diode (D1), a two-color light-emitting tube (D2), a switch (S2(S2-1 and S2-2)), an anode of the diode (D1) is connected with a terminal (B), a cathode of thediode (D1) is connected with one end of the resistor (R1), the other end of the resistor (R1) is connected with a gate of the switch (S2-2), two anodes of the two-color light-emitting tube (D2) are respectively connected with two throws of the switch (S2-2), a cathode of the light-emitting tube (D2) is connected with a terminal (E), a gate of the switch (S2-1) is connected with one throw of the switch (S2-1) and then connected with a terminal (F), the other throw of the switch (S2-1) is connected with a terminal (E), the resistor (R1) is a metal film resistor with the resistance value and the power of 47K and 1W respectively, and the type 4004 of the diode (D1), the double-color light emitting tube (D2) is a double-color light emitting whisk with a tube bulb diameter of 5mm, the switch (S2) is a double-pole double-throw locking type button switch, the ash removal indicating circuit comprises a resistor (R5), a light emitting tube (D6) and a transistor (Q2), the resistor (R5) is connected between the cathode of a diode (D4) and the anode of the light emitting tube (D6) in a jumping mode, the cathode of the light emitting tube (D6) is connected with the collector of the transistor (Q2), the emitter of the transistor (Q2) is grounded, the base of the transistor (Q2) is connected with a terminal (G), the resistor (R5) is a metal film resistor with the resistance value and the power of 1K and 1/4W respectively, the light emitting tube (D6) is a light emitting tube bulb with a tube bulb diameter of 5mm, the model of the transistor (Q2) is 9014, the voltage for controlling the rotating speed of the fan (15) is output from the terminals (C-E, E) The output, the deashing control voltage from the high voltage generation circuit is input from the terminal (G, F).

7. An electronic control circuit according to claim 6, characterized in that the fan circuit controlled by the circuit comprises two stator windings (L1, L2) of the fan (15), terminals (C ' E '), the common ends of the two stator windings (L1 and L2) being connected to terminal (E '), the other ends of the two stator windings (L1 and L2) being connected to terminals (C ' and D '), respectively, the terminals (C ' E ') being connected to the connections (C-E) by long conductors, respectively, the rated current of the stator winding (L2) being greater than the rated current of the stator winding (L1).

8. The electronic control circuit according to claim 6, wherein the high voltage generating circuit controlled by the circuit comprises resistors (R7-R10), capacitors (C4-C6), a high frequency transformer (T), diodes (D7-D9), a thyristor (Q3), terminals (B ', E' G ', H), a positive pole of the thyristor (Q3) and a terminal (B'), the capacitor (C5) is connected between a gate and a negative pole of the thyristor (Q3), a negative pole and a positive pole of the diode (D8) are respectively connected with the terminal (E ') and a negative pole of the thyristor (Q3), the resistor (R8) is connected between the terminal (E') and a gate of the thyristor (Q3), the capacitor (C4) is connected in series with a primary winding of the high frequency transformer (T) and then connected between the positive pole and the negative pole of the thyristor (Q3), one end of a secondary winding of the high frequency transformer (T) is connected with a negative pole of the diode (D9), the cathode of the diode (D9) is connected with a terminal (H), a resistor (R9) is connected with a capacitor (C6) in parallel and then bridged between the other end of the secondary coil of the high-frequency Transformer (TD) and the ground, a terminal F 'is grounded, a resistor (R10) is bridged between a terminal (G') and the other end of the secondary coil of the high-frequency transformer (T), terminals (B ', E' to G ') are respectively connected with terminals (B, E to G) by long leads, a terminal (H, F') is respectively connected witha terminal (H ') on the negative contact piece (26) and a terminal (F') on the positive contact piece (25) by long leads, the dust removal capacitor (7) obtains power supply of-3.5 KV to-4.5 KV by the negative receiving piece (26) and the positive contact piece (25), the resistance (R7) is a metal film resistor with the power of 3.6K and 1W respectively, the resistors (R9 and R10) are metal film resistors with the resistance of 470K and 1/4W respectively, the capacitor (C4) is a terylene capacitor with the capacity and the withstand voltage of 0.47 mu and 400V respectively, the capacitors (C5) and (C6) are terylene capacitors with the capacity and the withstand voltage of 0.01 mu and 63V respectively, the high-frequency transformer (T) is a horizontal output transformer of a silver sheep 12' black-and-white television produced by a television component factory in the market, the types of the diodes (D7 and D8) are 4004, the diode (D9) is a high-voltage rectifier tube with the type of 2CG2, and the thyristor (Q3) is a thyristor with the rated current and the withstand voltage of 0.5Ah 400V respectively.