JP2758655B2 - air purifier - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention detects house dust, tobacco smoke, and the like in indoor air by a sensor, and automatically drives a fan based on an output signal of the sensor. Air purifier that can also display the degree of contamination of dust and tobacco odor, etc.
The present invention also relates to an air purifier that removes a bad smell generated indoors.

[Prior Art] Household dust such as pollen and mite carcasses and feces, as well as tobacco dust and gas, and carpet dust as typical examples of household air stains, as well as cosmetics and alcohol There are also odors such as garbage and the like, but there are three types of air stains that are roughly classified from these odor components.

Here, there are a gas sensor and a photoelectric dust sensor as means for automatically operating by detecting these air stains with a sensor. The gas sensor operates by detecting odor components such as gas components of tobacco, cosmetics, and alcohol. The photoelectric dust sensor operates by detecting tobacco dust, dust and the like. Therefore, in order to automatically operate the sensor with respect to dirt in the air in the home, these two sensors are required, and it is necessary to operate while selecting the sensor operation according to the degree of dirt.

[Problem to be Solved by the Invention] As described above, an air purifier using two sensors does not exist at present, and each sensor has the following disadvantages.

First, the disadvantages of gas sensors are described. The mainstream of home air purifiers is to place a target on tobacco, but gas sensors that respond to gases such as H and CO emitted from tobacco are often used as gas sensors. However, in the case of a household air purifier, there is no effect of completely removing gases such as H and CO, even if it removes domestic dust and odor as an operation effect. Therefore, an air purifier using a gas sensor as a cigarette sensor has a function of only detecting the concentration level of gas generated from tobacco as an alternative to detecting the level of dust generated from tobacco and switching to an operation mode only for initial detection. When the change in concentration becomes small, a method of switching to a forced timer operation mode and operating the apparatus for a predetermined time to turn off the apparatus is generally used.

The reason for using this forced timer is because of the drawbacks of gas sensors. That is, when operating the air purifier,
Although the dust level can be removed, the gas concentration hardly decreases, and a gentle decline curve close to the natural decay, so even if the user sees that the dust has disappeared, the air purifier has been operated for a long time and is misunderstood. This is because

When the gas sensor is used as a cigarette sensor as described above, the microcomputer determines the amount of change in gas concentration, and in an air purifier that operates a fan,
As shown in FIG. 24, even if a cigarette is smoked at the point A, the operation is started at the point B according to the tobacco concentration, and then the forced timer operation is terminated, the gas concentration does not attenuate. When smoking in a high place, the change in gas is small compared to a place where the gas concentration is low, so the detection sensitivity level is low and the air purifier operates, that is,
There was a problem that the fan did not operate.

Next, disadvantages of the photoelectric dust sensor will be described. As for the dust and gas of tobacco dirt, the gas diffusion rate is faster than that of the dust, so that there is a disadvantage that the detection speed is slightly lower than the gas sensor. Another major problem is that if dust accumulates on the photoelectric dust sensor, a signal indicating that the dust is constantly contaminated is generated, which may cause a malfunction.

For the above reasons, the sensors mounted on the air purifier have been mainly gas sensors until now, and the automatic operation is completely incorporated into the specifications by the gas sensors. Regarding the automatic operation mode of the air purifier using the gas sensor, it is doubtful whether the operation is performed when the room air is really dirty. Air dirt is roughly classified into two types, "gas" and "dust". At present, most of the sensors use gas sensors due to the problem of the reliability of the photoelectric type dust sensor. Only detected.

The present invention has been provided in view of the above points,
It is an object of the present invention to provide an air purifier that aims to make it possible to evaluate the absolute value of dirt by compensating a weak point of a gas sensor with a photoelectric dust sensor and supplementing a weak point of the photoelectric dust sensor with a gas sensor.

[Means for Solving the Problems] The present invention provides means for detecting contamination of indoor air,
The gas sensor and the photoelectric dust sensor are used in combination, and in the case of dirty air having two degrees of pollution, such as tobacco dust and gas components, the initial detection is automatically performed by the gas sensor to determine whether the gas concentration is saturated. Or a switching means for switching the detection of the sensor to the photoelectric dust sensor when the output starts changing in a decreasing tendency.

[Operation] By the switching means, the initial detection is automatically performed by the gas sensor, and the detection of the sensor is switched to the photoelectric dust sensor when the gas concentration is saturated or the output starts to change in a decreasing tendency. ing.

[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 described. 16 shows a front view, FIG. 17 is a sectional view taken along line AA of FIG. 16, FIG. 18 is a sectional view taken along line BB of FIG. 16, and FIG. 19 is a sectional view taken along line CC of FIG. The sectional views are respectively shown. In FIG. 17, a boss 2 is protruded from the rear side substantially at the center of the main body 1, and a flat metal fitting 3 is fixed to the boss 2 with a screw 4. An induction motor 6 is fixed to the fixing bracket 3 via a vibration isolating rubber 5. A sirocco fan 8 is fixed to an output shaft 7 of the motor 6 by 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 so that the fan 8 rotates to suck and discharge air.

On the front side of the main body 1, a grill 12, a deodorizing filter 13,
A dust filter 14 and a pre-filter 15 are provided. The deodorizing filter 13 and the dust removing filter 14 are set between the 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 portion is disposed between the pre-filter 15 and the filter case 17, and a positive electrode 20 and a negative electrode 21 are disposed and fixed at an interval by a holding frame 19 of the electrode portion.

In FIGS. 16 and 19, a photoelectric dust sensor 22 is provided at a lower portion on the right side of the front surface of the main body 1.
Above that, a reset push button 23 for the filter life sign
Switch for turning on and off the photoelectric dust sensor 22
24 are arranged. By switching the switch 24, the photoelectric dust sensor 22 can be used in combination with a gas sensor, or can be cut off to use only the gas sensor alone.

A switch 57 provided on the upper right portion of the front surface of the main body 1 is a switch for turning on and off the gas sensor. By switching this switch 57, the operation of the gas sensor can be turned on and off. In other words, only the gas sensor is used depending on the operating environment, but if the environmental conditions are good, the switch 24 should be turned off and used. Conversely, if it is better to use only the photoelectric dust sensor alone depending on the environmental conditions, Is used with the switch 57 turned off. Normally, switches 24 and 57 are both in. Each time the manual switch 25 is pressed, the operation mode can be switched.
Further, a remote control receiving unit 26 is provided so that the microcomputer can switch to each operation mode by receiving an infrared carrier wave from the remote control transmitter.

The automatic operation display lamp 27, the timer operation state display lamp 28, the filter replacement sign lamp 29, and the turbo operation display lamp 30 shown in FIGS. And a diffusion sheet 32. A smoke acrylic plate 33 is provided on the front surface of the display to display pictograms for operation. The smoke acrylic plate 33 also serves as a light receiving filter of the remote control receiver.

Each of the lamps 30, 35 to 39 is an operation mode display lamp and has six stages of operation mode displays. In particular, reference numeral 30 denotes a turbo operation indicator lamp. Reference numerals 41 to 46 denote indoor lamps for indicating the degree of indoor dirt.
It lights up sequentially from 41.

As shown in FIG. 19, a gas sensor 47 is provided 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. This gas sensor
A sensor cap 49 and a gap seal 50 are provided around 47, and a gas sensor grid 51 is provided on a part of the front surface of the grill 12, as shown in FIG. It is easy to invade the sensor part.

As shown in FIG. 19, the photoelectric dust sensor 22 is disposed in the wind tunnel casing 11 so as to be surrounded by ribs 22a and 22b of a molded product, and an opening 22c for air suction is provided on the side of the grill 12. is there. As shown in FIG. 18, the ribs 40 for attaching the filter cases 16 and 17 and the holding frame 19 of the electrode block are provided in the wind tunnel casing 11, and are formed on the three-directional surfaces other than the extraction portions of the filter cases 16 and 17. An article rib 40 is formed. The side of the photoelectric dust sensor 22 of the rib 40 is
The dirty air in the room is sucked through the opening 22c in front of the photoelectric dust sensor 22, passes through the dust filter 14, the deodorizing filter 13, and is forcibly forced by the suction force of the internal sirocco fan 8. Is sucked.

Also, 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 disposed outside the spiral curve of the wind tunnel casing 11. On the front side of the wind tunnel casing 11, the printed circuit board 48
The printed circuit board 48 has a microcomputer and other control circuit components mounted thereon. The other main parts are the slide switch 24a as shown in FIG.
Are mounted on the printed circuit board 48. The slide switch 24a turns off the photoelectric dust sensor 22 when the photoelectric dust sensor 22 is not used. Since the slide switch 24a is usually used together with the gas sensor 47, the slide switch 24a is almost always turned on. Similarly, the slide switch 57a turns off the gas sensor 47 when the gas sensor 47 is not used. Since the slide switch 57a is normally used in combination with the photoelectric dust sensor 22, the slide switch 57a is almost always turned on.

On the back of the manual switch 25, a tact switch 25a for switching the air volume is provided.
Each time the button is pressed, the mode is sequentially switched among the standard mode of the automatic sensor operation, the powerful mode of the automatic sensor operation, the silent mode of the automatic sensor operation, the manual operation modes I, II, III, IV, V, the turbo operation, and the off. Similarly, a tact switch is provided below the reset push button 23 of the filter life sign, and a timer for notifying the life of the filter is reset.

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

In operation mode I, lamp 35 lights up In operation mode II, lamp 36 lights up In operation mode III, lamp 37 lights up In operation mode IV, lamp 38 lights up In operation mode V, lamp 39 lights up When the operation mode is turbo, the lamp 30 is turned on. Further, six lamps 41 to 46 for displaying the degree of contamination in the room are provided beside the lamps 35 to 39. These lamps 41 to 46 are sequentially lit as the degree of dirt increases from a low degree of dirt.
All the lamps 41 to 46 are turned on and display is performed.

As shown in FIG. 21, a discharge port 54 is provided on the upper surface of the main body 1, and a high voltage generating unit 55 is provided on the upper part of the main body 1 as shown in FIG. A DC voltage is input and applied from the printed circuit board 52 to the generating unit 55, and + 6500V to 7000V is applied to the positive electrode 20 of the electrode plate as an output voltage, and the negative side is the negative electrode of the electrode plate.
Connected to 21.

Also, as shown in FIG.
A conductive adhesive is adhered to the entire back surface of the inside dust filter 14 with a binder. An electrode plate 56 is attached to the filter frame so as to contact the surface of the conductive adhesive. The electrode plate 56 is connected to the negative side of the high-voltage generation unit 55 via an electrode plate in a filter storage section of the wind tunnel casing 11.

The overall configuration has been described above, and each mode will be individually described below. First, the dirt in the home and the sensor sensing ability will be described. FIG. 9 shows changes in the output of the cigarette smoke and gas sensor and the photoelectric dust sensor. As shown in the figure, regarding tobacco, the output of the photoelectric dust sensor changes according to the dust in the tobacco, and the H,
The output of the gas sensor also changes according to the gas such as CO.

FIG. 10 shows output changes of a gas sensor and a photoelectric dust sensor for house dust and dust. As shown in the figure, for house dust and dust, only the photoelectric dust sensor changes its output.

FIG. 11 shows the odor of cosmetics and sake, and changes in the outputs of the gas sensor and the photoelectric dust sensor. As shown in the figure, only the gas sensor changes the output for the smell of cosmetics and alcohol.

Accordingly, when two gas sensors and two photoelectric dust sensors are used in combination, the sensor operation mode for cigarette smoke and the like, the sensor operation mode for house dust and dust,
The air purifier can be automatically operated according to the degree of contamination in the sensor operation mode for cosmetics, alcoholic smell, and the like.

FIG. 12 shows a sensor operation mode for cigarette smoke and the like. Now, when one cigarette starts to be smoked, the gas concentration and the dust concentration start to increase from the point O in the figure. However, since the gas diffusion speed is high, the output of the gas sensor rises rapidly and is large. Next, when the gas concentration reaches the point, the air purifier is turned on, and the operation starts at the point A. At this time, the output signal from the photoelectric dust sensor is ignored. When the smoking of tobacco ends, both the gas concentration and the dust concentration saturate. The dust concentration in the air rapidly decreases due to the operation of the air purifier, but the gas concentration gradually decreases. With the photoelectric dust sensor, when the concentration of dust decreases and reaches point B,
The air purifier, which has been operated by the output signal of the gas concentration, is switched to the operation of the photoelectric dust sensor. When the output of the photoelectric dust sensor reaches point C, the air purifier is turned off.

In the state at this time, the output states of the two sensors of the air purifier, the output of the photoelectric dust sensor has become equal to the initial state v _0, or slightly higher slightly v _2. In the gas sensor, the output of the gas sensor is in the initial state because the gas removal capability of the air purifier is inferior to the dust removal capability.
There is quite a high V ₂ state than V _0.

Here, when the second cigarette starts to be smoked, the output of the gas sensor and the output of the photoelectric dust sensor also start to increase, but since the output change amount of the photoelectric dust sensor is large, the output signal of the photoelectric dust sensor is At point D, the air purifier starts operating. When the second cigarette ends, the dust concentration rapidly decreases, and the gas sensor concentration gradually decreases with a higher sensor output than the first cigarette. Even if the output signal of the photoelectric dust sensor reaches point E, additional operation is performed. When the point F is reached, the air purifier is turned off.

As mentioned above, when smoking some cigarettes, dust generated by tobacco can be removed with an air purifier, but it is difficult to remove gas components such as H ₂ and CO in tobacco, The output signal of the gas sensor increases. That is, gas components remain in the room. Therefore, performing the output signal of the gas sensor reaches V _4, by issuing a ventilation necessary sign is provided to the air purifier with a signal of the gas sensor than the point G, the environmental protection of the person using the air cleaner. With this indoor ventilation, the concentration of the gas sensor also decreases rapidly, and the signal level of the photoelectric dust sensor becomes equal. Hereinafter, the above-described repetitive operation is referred to as an automatic operation mode of the air purifier.

FIG. 13 shows an operation mode mode for dust having no gas component such as dust on a carpet. Dust such as home dust cannot be detected unless it is a photoelectric dust sensor.
At the beginning of the operation mode, when the operating point of the photoelectric dust sensor stored in the memory in advance is reached, the air purifier operates at the point A. When the air purifier operates and the dust concentration decreases and reaches point B, additional operation is performed, and when the sensor output reaches point C, the air purifier is turned off.

FIG. 14 shows a sensor operation mode for the smell of cosmetics or alcohol. As shown in the figure, at the time of smell of cosmetics or liquor, the operation mode is stepped up according to the change in the output of the gas sensor, and when the sensor output is saturated, the saturation is determined, and then the timer operation is performed stepwise. Turn off. Reference value for the first time is the Vs _1, the reference value after the timer operation is Vs _2.

Fig. 15 shows the case of smoking a large room.
It shows a sensor operation mode for cigarette smoke and the like. In the figure, when one cigarette starts to be smoked, the gas concentration and the dust concentration start to increase from the point O. However, since the gas diffusion speed is high, the output of the gas sensor rises quickly and is large. Reached a point, at a voltage value V _1, the air purifier is turned on by the output of the gas sensor, to start the operation. Output rise photoelectric dust sensor is rises with a delay from the gas sensor, since when v output to _one or more of the level becomes, FIG. 1 such that the air purifier is switched to the operation mode at the output of the photoelectric dust sensor The circuit configuration is as shown in the figure. Since then
All are driven by the photoelectric dust sensor and the output signal is used to indicate the degree of contamination in the room. Operation of the air purifier,
There is no occurrence of dust gas, the output level of the gas sensor than V ₁ or less, the process returns to the value of V _0, the dust and gas come generated from this state, operating in a gas sensor, then photoelectric dust sensor Is repeated.

Next, a description will be given of a means for displaying the degree of indoor contamination when the gas sensor and the photoelectric dust sensor are used in combination. As shown in FIG. 23, the display of the degree of indoor contamination based on the output signal of the gas sensor is indicated by six levels of lamps 41 to 46 composed of light emitting diodes. As the degree of indoor contamination increases, the lamp 41
The lamps are sequentially turned on, and when the degree of contamination is the maximum, all six lamps 41 to 46 are turned on. The indoor dirt degree display based on the output signal of the photoelectric dust sensor is displayed in six stages of lamps 61 to 66 composed of light emitting diodes. As the indoor dirt level rises, the lamps 61 are sequentially turned on, and at the maximum dirt level, all six lamps 61 to 66 are turned on. As described above, the display of the degree of contamination of the gas component and the display of the degree of contamination of the dust component enable the environmental monitoring and automatic operation of the respective dirty air.

Here, in order to increase the detection sensitivity level of the photoelectric dust sensor 22, as shown in FIGS. 16 and 18, the wind flow Q generated by the sirocco fan 8 is changed to the photoelectric dust sensor.
By passing through the portion where the 22 is provided, dirty air in the room is forcibly drawn to the photoelectric dust sensor 22, and the detection sensitivity level of the photoelectric dust sensor 22 is increased. That is, a bypass air path is provided separately from the original air path, and the photoelectric dust sensor 22 is provided in the bypass air path.

As a means for displaying the degree of contamination in the room, in the initial state in which dirt such as cigarettes is generated, the lamps 41 to 46 for displaying dirt are turned on according to the degree of dirt using the output signal of the gas sensor 47. This is because the gas diffusion rate is faster than dust. If the photoelectric dust sensor 22 detects indoor dirt, this signal is used to display the degree of dust dirt. The switching of the automatic operation mode and the contamination degree display mode from the gas sensor 47 to the photoelectric dust sensor 22 as described above is shown in FIG. 7, and the automatic operation mode from the photoelectric dust sensor 22 to the gas sensor 47 is also shown. The switching of the dirt degree display mode is shown in the block diagram of FIG.

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

When the output amount of the gas sensor is saturated and the output change amount of the gas sensor does not change, the operation mode and the degree of contamination are displayed by switching to the output change of the photoelectric dust sensor.

When the output change of the gas sensor starts to decrease, the microcomputer determines the output change of the gas sensor, switches the automatic detection sensor from the gas sensor to the photoelectric dust sensor, and displays the operation mode and the degree of contamination.

When the detected concentration of the gas sensor exceeds a predetermined value, the ventilation sign is issued to the main body side as described above.

Next, the circuit configuration will be described. FIG. 1 is a block diagram showing switching from automatic operation of the gas sensor to automatic operation of the photoelectric dust sensor. The output of the gas sensor 47 is stored in the RAM 62 at a constant period, here, 30 seconds.
That is, the switch SW is switched every 30 seconds by the clock circuit 61.
a is turned on, the output voltage of the gas sensor 47 30 seconds before the RAM 62
V ₁ is stored. Then, the current output voltage Vs of the gas sensor 47 is stored in the RAM 63. Each
The calculation circuit 64 calculates V ₁ / Vs from V ₁ and Vs, and the result is input to the comparator 65. Here, if the determination value of the comparator 65 satisfies the condition of V ₁ /Vs≧0.95, the output of the gas sensor 47 is determined to be saturated, and an H level signal is output.

The output of the comparator 65 is normally at L level, and is connected to the set input of the RS flip-flop 66. When the output of the comparator 65 is at L level, the output Q of the flip-flop 66 is at L level. I have. Q output of the flip-flop 66 via the inverter G ₁ switches
It is connected to the SW _1, also connected to the input of the AND gate G ₂ for driving the switch SW _2. When the output of the comparator 65 is L level, the output Q of the flip-flop 66 is at the L level to turn on the switch SW ₁ via the inverter G _1. Therefore, the output of the gas sensor 47 is set to the switch SW ₁
Are input to the comparators 67 ₁ . The magnitude of the output of the gas sensor 47 is determined by each of the comparators 67 _{1 to} 67 ₅
It is in the state determined by. As shown in FIG. 2, the display is lit by the lamps 41 composed of light-emitting diodes via the drivers 68 ₁ . In the determination by the gas sensor 47, from a state not normally dirty air, the dirty going state, the switch SW ₁ is turned on to determine the gas sensor 47 outputs, to the output display, the output voltage of the gas sensor 47 When saturated, the switch SW ₁ is turned off, the gas sensor 47 output is in a state not determined.

Next, automatic operation by the photoelectric dust sensor 22 will be described. As in the case of the gas sensor 47, the switch SW
b is turned on every 30 seconds by the clock circuit 61, and 30
The output voltage Vb of the photoelectric dust sensor 22 seconds before is stored. The RAM 72 stores the output voltage Va of the photoelectric dust sensor 22 at the present time. Each output voltage is calculated by the arithmetic circuit 73.
Is used to calculate Vb / Va. If Vb / Va ≧ 1, the output of the comparator 74 is set to the H level. The output of the comparator 74 is input to an AND gate G _2, is taken and the AND gate G ₂ at the output of the H level of the gas sensor 47 is obtained by inverting the Q outputs sets the flip-flop 66 is saturated, to turn on the switch SW _2. That is, as shown in FIG. 2, at point f gas sensor 47 is saturated, the switch SW ₁ is turned off by the Q output of the flip-flop 66 until the output of the comparator 74 becomes H level, the gas sensor
The output status of 47 is displayed. Also, at this point,
Since the output of the comparator 74 does not become H level, the switch SW ₂ is also turned off.

Then, when the outputs of the arithmetic circuit 73 and the comparator 74 become H level, the output of the AND gate G ₂ becomes H level, and the switch SW ₂ is turned on to output the output of the photoelectric dust sensor 22 to the comparator 67 _1. .. Are determined. That is, the output state of the photoelectric dust sensor 22 is
Only when there is a tendency to fall after saturation, the output of the photoelectric dust sensor 22 is input to the photoelectric dust sensors 67 _1, so that a judgment state is set. Then, the output of the photoelectric dust sensor 22 is not determined when the output voltage of the photoelectric dust sensor 22 tends to increase or in a constant state.

The judgment values of the comparators 67 ₁ ... Are as shown in FIG.
Switching is performed at the sensor output voltage levels a to e. The output is input to the driver 68 ₁ … and the lamp 41
... lights up. At the same time, the output of the comparator 67 ₁ …
Driver 69 ₁ for controlling the motor switching circuit 70 ₁ …
Are turned on and off according to the output state of the comparators 67 ₁ ..., And the motor is operated according to the degree of contamination.

FIG. 3 shows an embodiment in which the detection concentration of the gas sensor 47 exceeds a predetermined value and is switched to the photoelectric dust sensor 22 and further to the gas sensor 47. An example in which the output of the gas sensor 47 exceeds a predetermined value, for example, when the output voltage change characteristic reaches a point a shown in FIG. 2 will be described. Upon reaching a point, the output of the comparator 67 ₁ is at H level, and at the same time to light the lamp 41 and entering a H level to the reset terminal R of the flip-flop 66, to output the L level from the output Q, the switch the SW ₁ causes off to turn on the switch SW ₂ through the inverter G _2. Therefore, when the output of the gas sensor 47 reaches the point a, the output of the gas sensor 47 is cut off and the operation is switched to the photoelectric dust sensor 22. Further, when the result from the arithmetic circuit 73 becomes Vb / Va ≦ 1.02, the H level set input S of the flip-flop 66 via a comparator 74, off the switch SW ₂ at Q output becomes H level,
By turning on the switch SW _1, photoelectric dust sensor 2
The gas sensor 47 output is connected from 2.

Next, in the fourth embodiment, when the reference value after stopping the operation of the fan is high, the output of the photoelectric dust sensor 22 is prioritized.
Shown in the figure. RAM62 is to store the reference value V ₁ of the determination current fan operating transition, RAM 63 the previous reference value V
₀ is stored. These two contents are calculated by the arithmetic circuit 64 to determine V ₀ ≦ V ₁ . The operation result is
When V ₀ ≦ V ₁ , the arithmetic circuit 64 outputs an H level, and V ₀ > V ₁
At the time of, the L level is output. The output of the arithmetic circuit 64 is input to the flip-flop 66. That is, when the H-level signal of the arithmetic circuit 64 is inputted to the set input S of the flip-flop 66 via a capacitor C ₁ and resistor R _1, Q output is H
Output level. When the output of the arithmetic circuit 64 goes low, the high level is input to the reset input R via the inverter G ₃ , the capacitor C ₂ , and the resistor R ₂ , so that the output Q outputs the low level. Q output of the flip-flop 66, the switch SW of the gas sensor 47 through inverter G _1
1 and the switch SW ₂ of the photoelectric dust sensor 22.

Here, when V ₀ ≦ V ₁ , the Q output of the flip-flop 66 becomes H level, the switch SW ₁ is turned off, and the switch SW ₂
Is turned on, the output of the photoelectric dust sensor 22 is input to the comparators 67 ₁ . The motor display switching circuit 75 is a circuit including a driver 68 ₁ , a lamp 41, a driver 69 ₁ , a motor switching circuit 70, and the like. When V ₀ > V ₁ , the Q output of the flip-flop 66 becomes L level, the switch SW ₂ is turned off, and the switch SW ₁
Is turned on, and the output of the gas sensor 47 is input to the motor display switching circuit 75.

FIG. 5 shows a 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 assigned as shown in FIG. The output Q ₁ to Q ₃ is an automatic operation mode for operating in accordance with the dirt concentration, Q ₄ to Q ₉ are operated strength 1-6
This is a manual operation mode in which the constant operation is performed. The output of Q ₁ to Q ₃ are respectively connected to an input of the OR gate G _4, its output is connected to the suction motor M via a driver transistor Tr _1. Selecting Q ₁ to Q ₃ in the manual switch 25, an OR gate G ₄ output outputs the H level, to drive the motor M. Therefore, if you select automatic driving,
In the manual operation in which the suction motor M is always driven and the operation is performed at a constant intensity, the suction motor M stops. The motor M is disposed near the back surface of the photoelectric dust sensor 22.

FIG. 6 shows still 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 the indoor dirt rises, the output change amount is automatically determined to be earlier. In this case, the operation mode of the fan is selectively controlled. The RAM 62 stores a reference value Vs ₁ corresponding to the output of the gas sensor 47.
AM71 has a reference value Vs corresponding to 22 outputs of the photoelectric dust sensor
₁ is stored. The arithmetic circuit 64, a Vs ₁ / Vsn and the output voltage Vsn of the gas sensor 47 at the reference value Vs ₁ and rise time is calculated, the operation result V ₁ is output. Similarly, on the photoelectric dust sensor 22 side, Vs
₁ / Vsn is calculated, and outputs the operation result V _2. This V ₁ and V ₂
Is input to the arithmetic circuit 76, are running at all times the magnitude determination of V ₁ and V _2. As a result, the switches SW ₃ and SW ₄
, And when V ₁ > V ₂ , the switch SW ₃ is turned on so that the output signal of the gas sensor 47 is input to the comparator 67 ₁ . When V ₁ ≤ V ₂ , photoelectric dust sensor
In order to input the output signal of the 22, the switch SW ₄ is turned on. Each switch SW ₃ and SW ₄ input is connected to inverter G
₅ indicates an inversion relationship, and they are not turned on at the same time.

FIG. 7 shows that if there is an initial detection of the photoelectric dust sensor 22,
An embodiment in which the output control system of the gas sensor 47 is turned off is shown. The RAM 62 stores a reference value Vs ₁ corresponding to the output of the gas sensor 47, and the RAM 71 stores a reference value Vs ₁ corresponding to the output of the photoelectric dust sensor 22. Gas sensor 47 and photoelectric dust sensor
The output variation of 22 respectively calculated by the arithmetic circuit 64 and 73, so that the comparator 67 ₁ ... determines and 67a ... an have respectively. The output of the comparator 67a of the photoelectric dust sensor 22 outputs an H level when the initial detection is performed when the degree of contamination is low, and the output is the switch SW _{5 of the} output of the gas sensor 47.
The Enter the L level via the inverter G _6, the switch
Shut off SW ₅ . At this time, the output of the gas sensor 47 is blocked by turning off the switch SW _5, photoelectric dust sensor 2
Only the output of No. 2 is determined by the comparators 67a and input to the motor display switching circuit 75. Therefore, if there is an initial detection of the photoelectric dust sensor 22, the gas sensor
47 The output control system is turned off.

FIG. 8 shows an embodiment in which a switch for turning on and off the sensor is separately provided. On the gas sensor 47 side,
RAM62 is a memory that store the reference value Vs ₁ of the front fan operation, an output Vsn of the gas sensor 47, the reference value Vs ₁
Is always input to the arithmetic circuit 64 and Vs ₁ / Vsn is executed. The calculation results are input to comparators 67 _1, ... Which determine the display of dirt and the operation intensity, and display and operation corresponding to the gas concentration are executed. Further, in the photoelectric dust sensor 22 side, RAM 71 is a memory for store the reference value Vs ₁ of the front fan operation, the output Vsn the reference value Vs ₁ of the photoelectric dust sensor 22 are input to the constant calculating circuit 73, Vs ₁ / Vsn is executed. The result of the calculation is input to the comparators 67a,... Which determine the display of dirt and the operation intensity, and display and operation corresponding to the concentration of dust and dust are executed. The power supply for the motor display switching circuits 75a and 75b is provided with a separate power switch 77, 78 for each of the gas sensor type and the photoelectric dust sensor type, and can be turned on and off depending on the use environment.

[Effects of the Invention] As described above, the present invention uses a gas sensor and a photoelectric dust sensor in combination as means for detecting indoor air dirt, and detects two types of dirt levels of dust such as tobacco and gas components. In the case of having dirty air, automatic detection is performed by a gas sensor for initial detection, and switching means for switching the detection of the sensor to a photoelectric dust sensor when the gas concentration is saturated or the output starts to change in a decreasing trend Therefore, it is possible to provide an air purifier that can be automatically operated in accordance with two types of contamination degrees of gas and dust, which did not exist conventionally, and also makes use of the characteristics of each sensor well. This has the effect of providing a full-scale air purifier that can perform automatic operation quickly and can also stop according to the degree of contamination in the room.

In addition, when the gas concentration is higher than the reference value, the automatic operation is performed based on the signal from the photoelectric dust sensor, so that the degree of dirt in the room can be quickly detected and the room can be cleaned. is there.

Furthermore, when the output level of the gas sensor has reached a certain level or more, by providing a display unit that recommends indoor ventilation, it is possible to smoothly ventilate the room by looking at the display unit,
It does not harm the health of the user.

In addition, a bypass air passage is provided separately from a suction air passage for purifying indoor air, and a photoelectric dust sensor is disposed in the bypass air passage, so that the degree of indoor contamination can be quickly and accurately detected. Can be done.

Furthermore, the first display unit for displaying the degree of contamination by the gas sensor output signal for the initial detection of the degree of contamination, and the degree of contamination by the output signal of the photoelectric dust sensor when the contamination level reaches the detection capability range of the photoelectric dust sensor. By providing the second display unit for performing display, two types of display of gas concentration and dust concentration can be performed.

In addition, as means for detecting indoor air contamination, a gas sensor and a photoelectric dust sensor are used in combination, and in the case of dirty air having two degrees of contamination of dust such as tobacco and gas components, the output of the gas sensor is used. By always comparing the signal and the output signal of the photoelectric dust sensor, and having the control means for automatically selecting the faster output change amount and controlling the fan operation mode when the indoor contamination rises, The type of room can be quickly cleaned by sensitively detecting the type of dirt in the room.

[Brief description of the drawings]

FIG. 1 is a block diagram of an embodiment of the present invention, FIG. 2 is an operation explanatory diagram of the above embodiment, and FIG. 3 is a block diagram of an embodiment in a case where the photoelectric dust sensor is switched to a gas sensor of the above embodiment.
FIG. 4 is a block diagram of an embodiment in which automatic operation is performed by the photoelectric dust sensor when the reference value after the fan operation is higher than the previous reference value, and FIG. FIG. 6 is a block diagram of an embodiment in which automatic operation is performed by the sensor when the output change amount of the sensor is fast, and FIG. 7 is configured to shut off the gas sensor side by the output of the photoelectric dust sensor of the above. Block diagram of an embodiment in the case,
FIG. 8 is a block diagram of an embodiment in which the power switch is separately provided, and FIG. 9 is a characteristic diagram showing changes in the output of the cigarette smoke and the gas sensor and the photoelectric dust sensor,
FIG. 10 is a characteristic diagram showing an output change of a gas sensor and a photoelectric dust sensor for house dust and dust,
FIG. 12 is a characteristic diagram showing changes in the output of the cosmetics, liquor smell and gas sensor and photoelectric dust sensor, and FIG. 12 is an operation explanatory diagram showing a sensor operation mode for cigarette smoke and the like, and FIG. FIG. 14 is an operation explanatory view showing an operation mode for the carpet dust and the like having no gas component, and FIG. 14 is an operation explanatory view showing the sensor operation mode for the smell of cosmetics and liquor, and FIG. FIG. 16 is a front view of the air purifier, FIG. 17 is a sectional view taken along the line AA of FIG. 16, and FIG. 18 is FIG. 19 is a cross-sectional view taken along the line CC of FIG. 16, FIG. 19 is a side view of the same, FIG.
FIG. 21 is a plan view of the same, FIG. 22 (a) is a front view of the same filter case, FIG. 22 (b) is a cutaway side view of the same,
FIG. 22 (c) is a cross-sectional view taken along the line CC of FIG. 22 (a).
FIG. 22D is a sectional view taken along the line AA of FIG.
Fig. (E) is a sectional view taken along the line BB of Fig. 22 (a) of the above, Fig. 23 is a front view of an air purifier of another embodiment of the same, and Fig. 24 is an operation explanatory view of a conventional example. . 22 is a photoelectric dust sensor, and 47 is a gas sensor.

──────────────────────────────────────────────────続 き Continued on the front page (72) Inventor Ryo Kitano 1048 Kadoma Kadoma, Osaka Prefecture Matsushita Electric Works Co., Ltd. 56) References JP-A-61-71816 (JP, A) JP-A-63-205126 (JP, A) JP-A-1-104324 (JP, A) (58) Fields investigated (Int. Cl. ⁶ , (DB name) B01D 46/00-46/46 F24F 7 / 00,7 / 007

Claims (6)

(57) [Claims] As means for detecting contamination of indoor air,
The gas sensor and the photoelectric dust sensor are used in combination, and in the case of dirty air having two degrees of pollution, such as tobacco dust and gas components, the initial detection is automatically performed by the gas sensor to determine whether the gas concentration is saturated. Or, an air purifier provided with a switching means for switching the sensor detection to the photoelectric dust sensor when the output starts to change in a decreasing trend. 2. The air purifier according to claim 1, wherein when the gas concentration is higher than a reference value, the automatic operation is performed by a signal from the photoelectric dust sensor. 3. The air purifier according to claim 2, further comprising a display unit for recommending indoor ventilation when the output level of the gas sensor has exceeded a certain level. 4. The air purifier according to claim 1, wherein a bypass air path is provided separately from the suction air path for purifying indoor air, and a photoelectric dust sensor is disposed in the bypass air path. vessel. 5. A first display unit for displaying a degree of contamination based on an output signal of a gas sensor for detecting an initial degree of contamination, and an output signal of the photoelectric type dust sensor when the contamination level reaches a detection capability range of the photoelectric type dust sensor. 2. The air purifier according to claim 1, further comprising a second display unit for displaying a degree of dirt by the display unit. 6. As means for detecting contamination of indoor air,
Using a gas sensor and a photoelectric dust sensor together, always compare the output signal of the gas sensor and the output signal of the photoelectric dust sensor in dirty air with two degrees of pollution, such as tobacco dust and gas components. An air purifier provided with control means for automatically selecting a faster output change amount and controlling a fan operation mode when indoor dirt rises.