JPH0330809A - Air purifier - Google Patents

Abstract

PURPOSE:To make absolute value foulness evaluation possible by using jointly a gas sensor and a photoelectric dust sensor with a switching means provided therebetween. CONSTITUTION:An indication is made of the degree of room foulness by the output signal from a gas sensor stepwise through lamps 41-46 consisting of light emitting diodes. As the degree of room foulness is increased, the lamps are lighted in numerical order starting with the lamp 41 and, at the time or the max. degree of the foulness, all of the six lamps 61-66 are lighted. To improve the level of detection sensitivity of a photoelectric dust sensor 22, the air flow Q produced by a sirocco fan 8 is made to pass through the part of an air purifier at which the photoelectric dust sensor 22 is located, whereby the foul air in a room is drawn by this sensor 22. The foulness indicating lamps 41-46 are lighted according to the degree of the foulness using output signals from a gas sensor 47.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention detects house dust, cigarette smoke, etc. in the indoor air using a sensor, and automatically operates a fan based on the output signal of the sensor. This is an air purifier that can also display the degree of dirtiness of the air.It is an air purifier that uses a fan to remove dust, cigarette odors, and other bad odors that occur indoors through a dust removal and deodorization filter. be.

[Prior Art] Typical examples of household air pollution include cigarette dust and gas, carpet dust, house dust such as pollen, dead dust mites, and feces, as well as cosmetics and alcohol. There are also odors such as the smell of garbage, but there are three types of air pollution that can be broadly divided into these odor components.

Here, there are gas sensors and photoelectric dust sensors as means for automatic operation by detecting air pollution using sensors. Gas sensors operate by detecting odor components such as cigarette gas components, cosmetics, and alcohol odors. The photoelectric dust sensor operates by detecting cigarette dust, dust, etc.

Therefore, in order to perform automatic sensor-based operation in response to air pollution in the home, these two sensors are required, and the sensor operation must be selected depending on the degree of pollution.

[Problems to be Solved by the Invention] As described above, there is currently no air purifier that uses two sensors, and each sensor has the following drawbacks.

First, let's discuss the drawbacks of gas sensors. The mainstay of home air purifiers are those that target cigarettes.
Gas sensors that react to gases such as H and Co emitted from cigarettes are often used. However, in the case of household air purifiers, although they may remove household dust and bad odors, they are not effective in completely removing gases such as H and Co. Air purifiers that use sensors,
As a substitute for detecting the level of dust emitted from cigarettes, it detects the concentration level of gas emitted from cigarettes and has an initial detection function that switches to operation mode.When the concentration change becomes small, it switches to forced timer operation mode. A commonly used method is to run it for a certain period of time and then turn it off.

The reason for using this forced timer is due to the drawbacks of gas sensors. In other words, when the air purifier is operated, the dust level can be removed, but the gas concentration hardly decreases, resulting in a gradual downward curve close to natural attenuation. This is because driving for a long time can lead to misunderstandings.

When the gas sensor is used as a cigarette sensor as described above, a microcomputer determines the amount of change in gas concentration and the fan is operated. Even if you smoke a cigarette and start operation at point B depending on the tobacco concentration, and then end the operation with a forced timer, the gas concentration will not decrease. Compared to this, the amount of gas change is small, and as a result, the detection sensitivity level is low, causing the problem that the air purifier does not operate, that is, the fan does not operate.

Next, we will discuss the drawbacks of photoelectric dust sensors. Regarding dust and gas from cigarette stains, the diffusion speed of gas is faster than that of dust, so the detection speed is slightly slower than that of gas sensors.

Another big problem is that when dust accumulates on the photoelectric dust sensor, it always sends out a signal indicating that it is dirty.
It has a potential cause of malfunction.

For the above reasons, the sensors installed in air purifiers have so far mainly been gas sensors, and automatic operation has been incorporated into all specifications using gas sensors. Regarding the automatic operation mode of this air purifier that uses a gas sensor, I am doubtful that it will actually operate when the indoor air is polluted. Air pollution can be broadly classified into two types: gas and dust, but currently, due to reliability issues with photoelectric dust sensors, most sensors use gas sensors, and gas pollution only detected.

The present invention has been provided in view of the above points, and by compensating for the weaknesses of the gas sensor with a photoelectric dust sensor and compensating for the weaknesses of the photoelectric dust sensor with the gas sensor,
The present invention provides an air purifier whose purpose is to make it possible to evaluate the absolute value of dirt.

[Means for Solving the Problems] The present invention uses a gas sensor and a photoelectric dust sensor together as a means for detecting indoor air pollution, and detects two types of pollution levels: cigarette dust and gas components. In the case of dirty air, a gas sensor is used for initial detection, and when the gas concentration is saturated or the output starts to change in a decreasing trend, the sensor is equipped with a switching means that allows the sensor to switch over to a photoelectric dust sensor. It is something.

[Function] The switching means automatically performs initial detection using the gas sensor, and switches the sensor detection to the photoelectric dust sensor when the gas concentration is saturated or the output starts to change in a downward trend. I have to.

[Example] Hereinafter, an example of the present invention will be described with reference to the drawings. First, the structure of the air purifier will be explained.

Figure 16 shows a front view, and Figure 17 shows A-A in Figure 16.
18 is a sectional view taken along line B-B in FIG.
9 shows a cross-sectional view taken along the line C--C in FIG. 16, respectively. 1st
In FIG. 7, a boss 2 is provided approximately at the center of the main body 1 so as to protrude toward the rear side, and a flat plate-shaped fixing fitting 3 is fixed to the boss 2 by screws 4. An induction motor 6 is fixed to this fixture 3 via a vibration isolating rubber 5. A sirocco fan 8 is fixed to the output shaft 7 of this motor 6 with a nut 9. A wind tunnel casing 11 is disposed between the outer periphery of the fan 8 and the inner periphery of the housing 10, and is arranged so that air is sucked in and discharged by the rotation of the fan 8.

On the front side of the main body 1, there is a grill 12 and a deodorizing filter 13.
, a dust removal filter 14, and a pre-filter 15 are provided. The deodorizing filter 13 and the dust removing filter 14 are set between filter cases 16 and 17, and are detachable from the main body 1 by grasping the handle 18 of the filter case 17.

An electrode part is disposed between the pre-filter 15 and the filter case 17, and a positive electrode 20 and a negative electrode 21 are arranged and fixed at a certain interval by a holding frame 19 of the electrode part.

In FIGS. 16 and 19, a photoelectric dust sensor 22 is disposed at the lower right side of the front surface of the main body 1, and above it a reset push button 23 for filter life sign and a photoelectric dust sensor A switch 24 for turning on and off 22 is provided. By switching this switch 24, the photoelectric dust sensor 22 can be used in combination with a gas sensor, or can be turned off and used alone as a gas sensor.

A switch 57 provided on the upper right side of the front surface of the main body 1 is an on/off switch for the gas sensor.
The operation of the gas sensor can be turned on and off by turning the button. In other words, depending on the environmental conditions, it is better to use the gas sensor alone, but if the environmental conditions are good, turn off the switch 24 and use it, and conversely, depending on the environmental conditions, it is better to use the photoelectric dust sensor alone. Normally, both switches 24 and 57 are on.

Further, each time the manual switch 25 is pressed, the operation mode can be changed. Furthermore, a remote control receiving unit 26 is provided, which allows the microcomputer to switch to each operating mode by receiving an infrared carrier wave from a remote control transmitter.

Automatic operation display lamp 27 shown in FIGS. 16 and 19,
The timer operation status display lamp 28, the filter replacement sign lamp 29, and the turbo operation display lamp 30 are each equipped with an LED to emit surface light using a light emitting diode.
It has a case 31 and a diffusion sheet 32. A smoked acrylic plate 33 is disposed on the front surface of the device in order to display the operation in a pictographic manner. This smoked acrylic plate 33 also serves as a light receiving filter for the remote control receiver.

Further, each of the lamps 30, 35 to 39 is an operation mode display lamp, and has six levels of operation mode display. In particular, 30
is the turbo operation indicator lamp.

Further, 41 to 46 are display lamps for indicating the degree of indoor contamination, and the display lamps are turned on sequentially from 41 according to the degree of contamination in the room.

As shown in FIG. 19, a gas sensor 47 is disposed on the upper right side of the front surface of the main body 1, and is mounted on a printed circuit board 48 on which a CPU and the like are mounted. A sensor cap 49 and a gap seal 50 are provided around the gas sensor 47, and a gas sensor grid portion 51 is provided on a part of the front surface of the grill 12 as shown in FIG. Air can easily enter a part of the gas sensor.

As shown in FIG. 19, the photoelectric dust sensor 22 is disposed in the wind tunnel casing 11 surrounded by molded ribs 22a and 22b, and an opening 22c for air suction is provided on the side of the grille 12. be. During wind tunnel gauging 11, the 18th
As shown in the figure, ribs 4o are provided to attach the filter case 16.17 and the holding frame 19 of the electrode block, and molded product ribs 4o are formed on three sides of the filter case 16.17 other than the take-out portion. . This rib 40
On the side of the photoelectric dust sensor 22, a rib 4° is cut, and the dirty air in the room is sucked through the opening 22c on the front of the photoelectric dust sensor 22, and the dust removal filter 14
, through the deodorizing filter 13, and is forcibly sucked in by the suction force of the internal sirocco fan 8.

As shown in FIG. 18, circuit components including a power transformer 53 are mounted on a printed circuit board 52 on the back side of the main body 1, and are arranged outside the spiral curve of the wind tunnel casing 11. The printed circuit board 48 is disposed on the front side of the wind tunnel gauging 11, and a microcomputer and other control circuit components are mounted on this printed circuit board 48. As another main component, a slide switch 24a is mounted on the printed circuit board 48, as shown in FIG. This slide switch 24a is used to turn off the photoelectric dust sensor 22 when the photoelectric dust sensor 22 is not in use, and since it is normally used together with the gas sensor 47, it is usually in the on state. Similarly, the slide switch 57a is used to turn off the gas sensor 47 when the gas sensor 47 is not in use, and since it is normally used in conjunction with the photoelectric dust sensor 22, it is in the on state most of the time.

A tact switch 25a for changing the air volume is provided on the back of the manual switch 25, and each time the manual switch 25 is pressed, the modes are switched between standard mode of sensor automatic operation, powerful mode of sensor automatic operation, silent mode of sensor automatic operation, and manual mode. Operation mode I, n, I[I
, ■, V, turbo operation, turns off sequentially. A tact switch is similarly provided below the filter life sign reset push button 23, and a timer that notifies the filter life is reset.

The lamps 35 to 39 made of light emitting diodes that display the status of each operation mode are as follows.

■When in driving mode■, lamp 35 lights up■driving mode■
When , lamp 36 lights up ■ When in driving mode ■, lamp 3
7 is lit ■When the driving mode is ■, the lamp 38 is lit ■When the driving mode is ■, the lamp 39 is lit ■When the driving mode is turbo, the lamp 3o is lit Also, on the sides of the above lamps 35 to 39, there are six lamps 41 to 41 for displaying the degree of contamination;
46 is arranged. These lamps 41 to 46 light up sequentially as the degree of contamination increases from when the degree of contamination is low, and when the degree of contamination is at its maximum, the six lamps 41 to 4 turn on.
6 are all lit to display the display.

As shown in FIG. 21, a discharge port 54 is provided on the top surface of the main body 1. Furthermore, as shown in FIG. A DC voltage is input and applied to the generation unit 55 from the printed circuit board 52, and the output voltage is +6500V to 7.
000V is applied to the plus electrode 20 of the electrode plate, and the minus side is connected to the minus electrode 21 of the electrode plate.

Further, as shown in FIG. 22, the filter case 16.
The back side of the dust removal filter 14 in 17 is coated with a conductive adhesive over the entire surface using a binder. An electrode plate 56 is attached to the filter frame so as to be in contact with the surface of the conductive adhesive. This electrode plate 56 is connected to the negative side of the high voltage generation unit 55 via an electrode plate located in the filter housing portion of the wind tunnel gauging 11.

Although the overall configuration has been described above, each mode will be explained individually below. First, we will explain the dirt in the home and the sensor's sensing ability. Figure 9 shows changes in cigarette smoke and the output of the gas sensor and photoelectric dust sensor. As shown in the figure, for cigarettes, the output of the photoelectric dust sensor changes depending on the dust in the cigarette.
The output of the gas sensor also changes depending on the gas such as C0.

Figure 10 shows changes in the output of the gas sensor and photoelectric dust sensor for house dust and dust. As shown in the figure, only the photoelectric dust sensor's output changes regarding house dust and dirt.

FIG. 11 shows the smell of cosmetics and alcohol, and changes in the output of the gas sensor and photoelectric dust sensor. (As shown in this figure, only the output of the gas sensor changes for smells such as cosmetics and alcohol.

Therefore, when two gas sensors and photoelectric dust sensors are used together, ■ sensor operation mode for cigarette smoke, etc., ■ sensor operation mode for house dust, dust, etc.
The air purifier can be automatically operated according to the degree of dirt in the sensor operation mode for smells of cosmetics, alcohol, etc.

FIG. 12 shows the sensor operation mode for cigarette smoke and the like. Now, when you start smoking a cigarette, the gas concentration and dust concentration begin to rise from the 0 point in the diagram. However, since the gas diffusion speed is fast, the output of the gas sensor increases quickly and greatly.

Next, when the gas concentration reaches point 0, the air purifier is turned on and starts operating at point A. At this time, the output signal from the photoelectric dust sensor is ignored. After smoking a cigarette, both gas and dust concentrations reach saturation. As the air purifier operates, the dust concentration in the air rapidly decreases, but the gas concentration gradually decreases. With the photoelectric dust sensor, when the dust concentration decreases and reaches point B, the air purifier, which has been operating based on the gas concentration output signal, is switched to the photoelectric dust sensor. When the output of the photoelectric dust sensor reaches 0, the air purifier turns off.

At this time, the output status of the two sensors of the air purifier is the initial state of the output of the photoelectric dust sensor! , V.O.
It is equivalent to or slightly higher than v2. Regarding the gas sensor, since the gas removal ability of the air purifier is inferior to the dust removal ability, the output of the gas sensor is in the initial state V and in the state (2), which is considerably higher.

Now, when you start smoking your third cigarette, the output of the gas sensor and the output of the photoelectric dust sensor start to rise,
Since the amount of change in the output of the photoelectric dust sensor is large, the air purifier starts operating when the output signal of the photoelectric dust sensor reaches point D.

After the 3rd tava is finished, the dust concentration decreases rapidly,
The gas sensor concentration gradually decreases when the sensor output is higher than the first one. Even if the output signal of the photoelectric dust sensor reaches point E, additional operation is performed. And F
Turn off the air purifier when the point is reached.

As mentioned above, when smoking several cigarettes, the dust generated by the cigarettes can be removed with an air purifier, but gas components such as H2 and Co in the cigarettes are difficult to remove. The sensor output signal becomes high. In other words, gas components remain inside the room. Therefore, the output signal of the gas sensor is V.

When this point is reached, a signal from the gas sensor is used to issue a ventilation required sign on the air purifier from point G, thereby protecting the environment for the person using the air purifier.

Due to this indoor ventilation, the concentration of the gas sensor also decreases rapidly, bringing the signal level of the photoelectric dust sensor to the same level. Hereinafter, the above-described repeated operation will be referred to as the automatic operation mode of the air purifier.

FIG. 13 shows an operating mode for dust that does not have a gas component, such as carpet dust.

Dust such as home dust can only be detected by a photoelectric dust sensor.At the beginning of the operation mode, when the operating point [phase] of the photoelectric dust sensor stored in advance in memory is reached, the air purifier operates at point A. do. The air purifier operates, and even if the dust concentration decreases and reaches point B, additional operation is performed, and when the sensor output reaches 0 point, the air purifier turns off.

FIG. 14 shows the sensor operation mode for smells of cosmetics and alcohol. As shown in the figure, when there is a smell of cosmetics or alcohol, the operation mode is stepped up according to the change in the output of the gas sensor, and when the sensor output is saturated, it is determined that it is saturated, and then the timer operation is used to gradually increase the operation mode. Turn it off.

The initial reference value is Vs1, but the reference value after the timer operation is Vs2.

Figure 15 shows the case where the cigarette is smoked in a large room.
This shows the sensor operation mode for cigarette smoke, etc. In the figure, when one starts smoking a cigarette, both the gas concentration and the dust concentration begin to rise from the zero point. However, since the gas diffusion speed is fast, the output of the gas sensor increases quickly and greatly, and when it reaches the 0 point and reaches the voltage value (■), the air purifier is turned on by the output of the gas sensor and starts operating. The output of the photoelectric dust sensor rises later than that of the gas sensor, but as shown in Figure 1, the air purifier switches to operation mode with the output of the photoelectric dust sensor when the output exceeds the Vt level. It has the circuit configuration shown. From then on, everything will be operated using the photoelectric dust sensor, and at the same time the level of indoor pollution will be displayed using its output signal.The air purifier will no longer operate and dust gas will no longer be generated, and the output level of the gas sensor will be below v1.■. When dust or gas is generated from this state, the sensor operates with the gas sensor, then switches to the photoelectric dust sensor, and repeats this process.

Next, an explanation will be given of indoor dirt level display means when a gas sensor and a photoelectric dust sensor are used in combination.

As shown in FIG. 23, the degree of indoor dirtiness is displayed using the output signal of the gas sensor using a lamp 41 consisting of a light emitting diode.
It is displayed in 6 stages from 46 to 46.

As the degree of indoor dirt increases, the lamps 41 will turn on in sequence, and when the degree of dirt is at its maximum, all six lamps 41 to 4 will turn on.
6 lights up. The level of indoor dirtiness is displayed using the output signal of the photoelectric dust sensor using lamps 61 to 61 consisting of light emitting diodes.
It is displayed in 6 stages of 66. As the degree of indoor contamination increases, the lamps 61 will turn on in sequence, and when the degree of contamination is at its maximum, all six lamps 61 to 66 will light up, indicating the degree of contamination of gas components and dust. Since the degree of pollution of each component is displayed, it is possible to monitor the environment of each polluted air and operate automatically.

Here, in order to increase the detection sensitivity level of the photoelectric dust sensor 22, as shown in FIGS. 16 and 18,
By passing the wind flow Q generated by the sirocco fan 8 through the section where the photoelectric dust sensor 22 is installed,
Dirty indoor air is forcibly drawn toward the photoelectric dust sensor 22 to increase the detection sensitivity level of the photoelectric dust sensor 22. In other words, a bypass air path is provided separately from the original air path, and a photoelectric dust sensor is installed in this bypass air path.
2 is installed.

Further, as a means for displaying the degree of dirt in the room, in an initial state where dirt such as cigarettes has occurred, the output signal of the gas sensor 47 is used to turn on the dirt display lamps 41 to 46 according to the dirt degree. This is because the diffusion rate of gas is faster than that of dust. In addition, if the photoelectric dust sensor 22 detects dirt in the room, this signal is used to
Displays the degree of dust contamination. Gas sensor 4 as above
7 to the photoelectric dust sensor 22 and the dirt level display mode are shown in FIG. The switching is shown in the block diagram of FIG.

By the way, there are the following three conditions for switching the operation mode from the gas sensor to the photoelectric dust sensor.

■ When the output of the gas sensor is saturated and the amount of change in the output of the gas sensor no longer changes, it switches to the output change of the photoelectric dust sensor and displays the operating mode and dirt level.

■ When the amount of change in the output of the gas sensor starts to decrease, the amount of change in the output of this gas sensor is judged by the microcomputer, the automatic detection sensor is switched from the gas sensor to the photoelectric dust sensor, and the operation mode and dirt level are displayed. .

■ When the concentration detected by the gas sensor exceeds a predetermined value, a ventilation sign will be displayed on the main unit as described above.

Next, the circuit configuration will be explained. FIG. 1 is a block diagram showing switching from gas sensor automatic operation to photoelectric dust sensor automatic operation, and the output of the gas sensor 47 is stored in the RAM 62 at regular intervals, here at 30 second intervals. That is, the clock circuit 61 turns on the switch SWa every 30 seconds, and the output voltage (1) of the gas sensor 47 30 seconds ago is stored in the RAM 62. Then, the current output voltage Vs of the gas sensor 47 is stored in the RAM 63. For each of Vl and Vs, an arithmetic circuit 64 calculates V 1 /Vs, and the result is input to a comparator 65 . Here, if the determination value of the comparator 65 satisfies the condition of V 1 /V s≧0°95, it is determined that the output of the gas sensor 47 is saturated, and an H level signal is output.

The output of the comparator 65 normally outputs an L level, and is connected to the set input of the R-S flip-flop 166. When the output of the comparator 65 is at an L level, the output Q of the flip-flop 66 is at an L level. There is. The Q output of the flip-flop 166 is connected to the switch SW1 via an inverter G, and is also connected to the input of an AND gate G2 that drives the switch SW2. When the output of the comparator 65 is at the L level, the output Q of the flip-flop 66 is at the L level, turning on the switch SW1 via the inverter G. Therefore, the output of the gas sensor 47 is transmitted to the comparator 67 via the switch SW.
1... is input. Then, the magnitude of the output of the gas sensor 47 is determined by each of the comparators 671 to 67. Depending on the level of dirt in the room, the lamps 41 made of light emitting diodes are turned on and displayed via the drivers 681 as shown in FIG. 2. In this judgment based on the gas sensor 474, when the air is normally in a clean state and becomes dirty, the switch SW1 is turned on to judge the gas sensor 47 output and display the output, and the output voltage of the gas sensor 47 is When saturated, the switch SW1 is turned off and the output of the gas sensor 47 is not judged.

Next, automatic operation using the photoelectric dust sensor 22 will be explained. As in the case of the gas sensor 47, the switch SWb is turned on every 30 seconds by the clock circuit 61.
The output voltage vb of the photoelectric dust sensor 22 30 seconds ago is stored in the RAM 71. The RAM 72 stores the current output voltage Va of the photoelectric dust sensor 22. For each output voltage, an arithmetic circuit 73 calculates Vb/Va. If Vb/Va≧1, the output of the comparator 74 is set to H level. The output of this comparator 74 is input to the AND gate G2, and when the gas sensor 47 is saturated, the flip-flop 66 is set and the Q output is inverted. and turns on the switch SW2. In other words, as shown in FIG.
At this point, the switch SW is turned off by the Q output of the flip-flop 66, and the state of the output of the gas sensor 47 is displayed until the output of the comparator 74 reaches the H level.

Furthermore, at this point, the output of the comparator 74 does not reach the H level, so the switch SWi is also turned off.

Then, the output of the arithmetic circuit 73 and the comparator 74 becomes H.
When the level is reached, the output of the AND gate G2 becomes the H level, the switch SW2 is turned on, and the output of the photoelectric dust sensor 22 is determined by the comparator 67+. That is, photoelectric dust sensor 2
Only when the output state of 2 tends to decrease after being saturated,
The output of the photoelectric dust sensor 22 is sent to the photoelectric dust sensor 6.
7+... will be input, and it will be in a judgment state.

The output voltage of the photoelectric dust sensor 22 is not determined when the output voltage of the photoelectric dust sensor 22 tends to increase or is in a constant state.

As shown in FIG. 2, the judgment values of the comparators 67 I... are switched at values a to e of the sensor output voltage level. The output is input to the driver 681... and lights up the lamp 41.... At the same time, the outputs of the comparators 67, . . .
driver 69 for controlling the The motor switching circuit 70 is turned on and off depending on the output state of the comparators 67, . . . , and the motor is operated according to the degree of contamination.

FIG. 3 shows that when the concentration detected by the gas sensor 47 exceeds a predetermined value, the concentration is detected by the photoelectric dust sensor 22, and furthermore, the gas sensor 4
7 is shown. When the output of the gas sensor 47 exceeds a predetermined value, for example, when it reaches point 2a, which explains the example of reaching point a of the output voltage change characteristics shown in FIG. 2, the output of the comparator 67 goes to H level. Therefore, by turning on the lamp 41 and at the same time inputting an H level to the reset terminal R of the flip-flop 66, the output Q outputs an L level, turning off the switch SWI, and turning off the switch SW2 via the inverter G2. Turn it on. Therefore, the gas sensor 47
When the output reaches point a, the output of the gas sensor 47 is cut off and the output is switched to the photoelectric dust sensor 22. Further, the result from the arithmetic circuit 73 is V b /V a
When it becomes ≦1.02, the setting manual S of the flip-flop 66 is set to H level via the comparator 74, and the switch SW2 is turned off and the switch SW + is turned on at the Q output that has reached the H level. The output of the gas sensor 47 will be connected from the dust sensor 22.

Next, a fourth embodiment will be described in which the output of the photoelectric dust sensor 22 is prioritized when the reference value after the fan stops operating is high.
As shown in the figure. The RAM 62 stores the current reference value (■) for determining the transition to fan operation, and the RAM 63 stores the previous reference value (■). It stores. These two contents are calculated by the arithmetic circuit 64. Determine ≦v1.

When the calculation result is V0≦v1, the calculation circuit 64 outputs an H level; 〉■, outputs L level. The output of the arithmetic circuit 64 is input to a flip-flop 66.

That is, when the H level signal of the arithmetic circuit 64 is input to the setting manual S of the flip-flop 66 via the capacitor C4 and the resistor R, the Q output outputs the H level.

When the output of the arithmetic circuit 64 becomes L level, the inverter G
3. Reset input R via capacitor C2 and resistor R2
Since the H level is input to the output Q, the output Q outputs the L level. The Q output of the flip-flop 66 is connected to the inverter G.
1 to a switch SWI of the gas sensor 47 output;
It is connected to the switch SW2 of the photoelectric dust sensor 22.

Here, ■. When ≦V, Q of flip-flop 66
The output becomes H level, switch SW + is turned off,
Turn on the switch SW2, and the photoelectric dust sensor 22
The output of is input to the comparator 67-... side. In addition, the motor display switching circuit 75 is connected to the driver 681.
..., lamp 41...-driver 69. . . . is a circuit including a motor switching circuit 70 and the like. Also,
When V o > V +, the Q of the flip-flop 66
When the output becomes L level, the switch SW2 is turned off, the switch SW1 is turned on, and the output of the gas sensor 47 is input to the motor display switching circuit 75.

FIG. 5 shows the circuit configuration connected to the manual switch 25. The manual switch 25 is connected to a decimal counter 76, and the output of the decimal counter 76 is allocated as shown in FIG. Outputs Q1 to Q are automatic operation modes that operate according to the dirt concentration, and Q, to Qs
is a manual operation mode in which operation intensity is constant from 1 to 6.

The outputs of Q, ~Q, are connected to the inputs of the OR gate G, and the output is connected to the driver transistor 'l'r.
It is connected to the suction motor M via l. If you select Q, ~Q with the manual switch 25, it will be an or game) G
The 4th output outputs H level and drives the motor M. Therefore, when automatic operation is selected, the suction motor M
In manual operation, which is driven at a constant intensity,
The suction motor M will stop. Note that this motor M is disposed near the back side of the photoelectric dust sensor 22.

FIG. 6 shows yet another embodiment, in which the output signal of the gas sensor 47 and the output signal of the photoelectric dust sensor 22 are constantly compared, and when indoor dirt rises, the one with the faster output change is automatically selected. The operating mode of the fan is controlled by selectively selecting the The reference value V s (corresponding to the output of the gas sensor 47) is stored in the RAM 62, and the photoelectric dust sensor 22 is stored in the RAM 71.
A reference value vsl corresponding to the output is stored. In the arithmetic circuit 64, the difference between the reference value Vsl and the output voltage Vsn of the gas sensor 47 at the time of rising is Vs, /Vsn.
is calculated, and the calculation result V is output.

Similarly, the photoelectric dust sensor 22m also has an arithmetic circuit 7.
3, V s H/V sn is calculated, and the calculation result V2
Output. These ■1 and V2 are input to an arithmetic circuit 76, which constantly judges the magnitude of vl and vl.

The result is sent to switches SWj and SW in real time.

When V I > V 2, the gas sensor 47
The switch SW is turned on in order to input the output signal to the comparator 67, . Also, ■1≦■2
At this time, the switch SW4 is turned on to input the output signal of the photoelectric dust sensor 22.

Note that the switches SW 3 and SW 4 are in the inverting state by the inverter G, and are not turned on at the same time.

Figure 7 shows that if there is initial detection by the photoelectric dust sensor 22,
This shows an embodiment in which the gas sensor 47 output control system is turned off. A reference value Vs corresponding to the output of the gas sensor 47 is stored in the RAM 62, and
A reference value Vsl corresponding to the output of the photoelectric dust sensor 22 is stored in the RAM 71. gas sensor 47
The calculation circuit 6 calculates the amount of change in the output of the photoelectric dust sensor 22.
It has comparators 67, . . . 767a, . The output of the comparator 67a of the photoelectric dust sensor 22 outputs H level when the degree of dirt is low and the initial detection is made.
The output is inputted to the switch SW of the gas sensor 47 output via the inverter G6 to the L level, and the switch SW is cut off. At this time, the output of the gas sensor 47 is the switch SW.

is shut off by turning off, and only the output of the photoelectric dust sensor 22 is judged by the comparators 67a . . . and input to the motor display switching circuit 75. Therefore,
If there is initial detection by the photoelectric dust sensor 22, the gas sensor 47 output control system will be turned off.

FIG. 8 shows an embodiment in which a switch for turning on and off the sensor is provided separately. On the gas sensor 47 side,
The RAM 62 is a memory that stores the reference value Vs before fan operation, and the output Vsn of the gas sensor 47.
The reference value Vs, which is constantly input to the arithmetic circuit 64, is
s,/V sn is executed. The calculation result is sent to a comparator 67 that determines dirt display and driving intensity;
... is input, and the display and operation are executed according to the gas concentration. In addition, with the photoelectric dust sensor 22 side number,
The RAM 71 is a memory that stores the reference value Vsl before fan operation, and the output Vs of the photoelectric dust sensor 22.
n and the reference value V s are constantly input to the arithmetic circuit 73,
Vs, /Vsn are executed. The calculation results are input to the comparators 67a, which determine dirt display and operation intensity, and display and operation are executed according to the dust and dust concentration. Motor display switching circuit 75a.

The power supply for the 75b is a gas sensor type and a photoelectric dust sensor type, each with separate power switches 77 and 78, making it possible to turn them on or off depending on the usage environment.

[Effects of the Invention] As described above, the present invention uses a gas sensor and a photoelectric dust sensor together as a means for detecting indoor air pollution, and detects two types of dirt levels: cigarette dust and gas components. In case of dirty air, a gas sensor is automatically operated for initial detection, and when the gas concentration is saturated or the output starts to change in a decreasing trend, the sensor is equipped with a switching means that switches the sensor detection to a photoelectric dust sensor. Because it is,
It is possible to provide an air purifier that can operate automatically according to two levels of contamination, gas and dust, which did not exist before.In addition, by making good use of the characteristics of each sensor, it is possible to achieve automatic operation more quickly. This has the effect of providing a full-fledged air purifier that can be stopped depending on the degree of dirt in the room.

In addition, when the gas concentration is higher than the standard value, automatic operation is performed using a signal from a photoelectric dust sensor, which quickly detects the degree of dirt in the room and cleans the room. be.

Furthermore, by providing a display section that recommends ventilation in the room when the output level of the gas sensor exceeds a certain level, users can easily ventilate the room by looking at the display section, which may harm the user's health. There is no such thing.

In addition, by providing a bypass air path separate from the suction air path for cleaning indoor air, and installing a photoelectric dust sensor in the bypass air path, the degree of indoor dirt can be detected quickly and accurately. It is something that can be done.

Furthermore, initial dirt level detection is performed using the first display section which displays the dirt level using the gas sensor output signal, and when the dirt level reaches the detection capability range of the photoelectric dust sensor, the dirt level is displayed using the output signal of the photoelectric dust sensor. By providing a second display section that displays the information, it is possible to reduce the concentration of gas and dust.
Street display can be done.

In addition, a gas sensor and a photoelectric dust sensor are used together as a means of detecting indoor air pollution, and the output of the gas sensor is Equipped with a control means that constantly compares the signal with the output signal of the photoelectric dust sensor and automatically selects the one with the faster output change when indoor dirt builds up to control the fan operating mode. It can sensitively detect the type of dirt in the room and quickly clean the room.

[Brief explanation of drawings]

FIG. 1 is a block diagram of an embodiment of the present invention, FIG. 2 is an explanatory diagram of the same operation, and FIG. 3 is a block diagram of an embodiment in which the photoelectric dust sensor described above is converted into a gas sensor.
Figure 4 is a block diagram of an embodiment in which automatic operation is performed using a photoelectric dust sensor when the reference value after the fan operation is higher than the previous reference value. Figure 6 is a block diagram of an example of automatic operation using a sensor when the output change rate of the same sensor is fast, and Figure 7 is a block diagram of an example in which the output of the photoelectric dust sensor shown above is used to shut off the gas sensor side. A block diagram of an embodiment of the case,
Fig. 8 is a block diagram of an embodiment in which the above power switch is provided separately; Fig. 9 is a characteristic diagram showing output changes of the cigarette smoke and gas sensor and photoelectric dust sensor shown above;
Figure 10 is a characteristic diagram showing changes in the output of the gas sensor and photoelectric dust sensor for house dust and dust, and Figure 11 shows changes in the output of the gas sensor and photoelectric dust sensor for the odor of cosmetics and alcohol. 12 is an operation explanatory diagram showing the sensor operation mode for cigarette smoke, etc., as described above; FIG. 13 is an operation explanatory diagram showing the operation mode for dust such as carpet dust, which does not have a gas component, Figure 14 is an explanatory diagram showing the operation mode of the sensor for smells of cosmetics and alcohol, Figure 15 is an explanatory diagram of the operation of the sensor for cigarette smoke, etc. Front view, FIG. 17 is a sectional view taken along line A-A in FIG. 16 shown above, FIG. 18 is a sectional view taken along line B-B shown in FIG. 16 shown above, and FIG. , FIG. 20 is a side view of the same as above, FIG. 21 is a plan view of same as above, FIG. 22(a) is a front view of filter case same as above,
FIG. 22(b) is a broken side view of the same as above, FIG. 22(e) is a sectional view taken along the line C-C of FIG. 22(a) of the same as above, and FIG. 22(d)
are sectional views taken along line A-A in FIG. 22(a), and FIG. 22(e).
) is a cross-sectional view taken along line BB in FIG. 22 (, ), FIG. 23 is a front view of another embodiment of the air cleaner, and FIG. 24 is an explanatory diagram of the operation of the conventional example. 22 is a photoelectric dust sensor, and 47 is a gas sensor.

Claims (6)

[Claims] (1) As a means of detecting indoor air pollution, a gas sensor and a photoelectric dust sensor are used together, and initial detection is possible in dirty air that has two types of pollution: cigarette dust and gas components. An air purifier that operates automatically using a gas sensor, and is equipped with a switching means that switches the sensor detection to a photoelectric dust sensor when the gas concentration reaches saturation or the output starts to change in a downward trend. (2) The air purifier according to claim 1, wherein when the gas concentration is higher than a reference value, automatic operation is performed based on a signal from a photoelectric dust sensor. (3) The air purifier according to claim 2, further comprising a display unit that recommends indoor ventilation when the output level of the gas sensor exceeds a certain level. (4) The air purifier according to claim 1, characterized in that a bypass air path is provided separately from the suction air path for cleaning indoor air, and a photoelectric dust sensor is disposed in the bypass air path. (5) The initial level of contamination is detected by the first display section which displays the level of contamination using the output signal of the gas sensor, and when the level of contamination reaches the detection capability range of the photoelectric dust sensor, the output signal of the photoelectric type dust sensor is used to detect the contamination level. The air purifier according to claim 1, further comprising a second display section for displaying the temperature. (6) A gas sensor and a photoelectric dust sensor are used together as a means of detecting indoor air pollution, and when the air is contaminated with two types of pollution: cigarette dust and gas components, the gas sensor is An air purifier equipped with a control means that constantly compares the output signal with the output signal of a photoelectric dust sensor and automatically selects the one with the faster output change when indoor dirt builds up to control the fan operating mode. .