JPH01104324A - Air cleaner - Google Patents

Abstract

PURPOSE:To make sensitivity of a sensor almost constant even in a room of high gas concentration by comparing a detected value of contamination in the room at the moment of stopping a fan to a reference value before operating the fan and by correcting a value of criterion level when the detected value of contamination after stopping the fan is large. CONSTITUTION:Setting VS1 as a reference value of contamination before operating a fan, an operation mode of low-high is selected in accordance with a calculation result of an accumulator 11, which represents a contamination caused by smoking. When the fan is stopped, a value of contamination VS2 indicated right after the stop is stored in RAM 21 as a reference value. At this moment, the ratio of reference value after stopping the fan to that before operating the fan, VS2/VS1, is calculated by an accumulator 22, and the calculated value is compared to a prescribed value by a comparator 23. If the former value is equal or larger than the latter one, i.e., the gas concentration after stopping the fan does not return to the former low state, a criterion level of fan operation shall be corrected to be higher by a correction device 20.

Description

[Detailed Description of the Invention] [Technical Field 1] The present invention detects house dust and cigarette smoke in the indoor air and drives a fan to remove it, and also removes cigarette odor and other bad odors generated indoors. It is related to air purifiers.

[Background technology 1] There are many pollen, dead dust mites, and feces in the home, as well as dust generated from lifting and lowering futons and walking on carpets, which act as allergens and are the cause of asthma, etc. .

On the other hand, many home air purifiers have a tarded cigarette, which automatically selects a cigarette sensor and determines the operating mode t-' according to the output of the sensor.

This tobacco sensor detects HlCo and other substances emitted from cigarettes.
Although it reacts with sulfur, the sulfur type is often used and is called C7. However, *In the case of a garden air purifier, although it may remove domestic dust and bad odors as an operational effect,
It does not have the effect of completely removing gases such as Co.

Therefore, in an air purifier that uses a gas sensor as a cigarette sensor, it detects the concentration level of gas generated from cigarettes instead of detecting the level of dust generated from cigarettes, and then switches to operation mode! It has a function only for initial detection of F, and is generally used to switch to a forced timer operation mode when the concentration change becomes small, operate for a certain period of time, and then turn off. The reason for using this forced timer is that even if the operation continues, the dust level can be removed, but the gas concentration will hardly decrease and will have a gradual downward curve due to natural attenuation. This is because air purifiers can cause misunderstandings if they are not operated for a long time.

As mentioned above, the gas sensor is a cigarette sensor.

- When used closed, in a purifier that operates a fan by determining the amount of change in gas concentration with a micro combinator, as shown in Figure 1, 1. It starts operation depending on the tobacco concentration, and a forced timer Even if you have to stop driving for a while,
Since the gas concentration is negligible, this I:), when you smoke in a place where the gas concentration is low, the change in gas IIf is smaller than in a place where the gas concentration is low, and therefore the detection sensitivity level This caused problems such as the air purifier not working and the filter 77 not operating properly.

[Objective of the Invention 1 The present invention has been provided in view of the above, and
Point 2 is to keep the sensor sensitivity almost constant even when the gas concentration is changing. The air purifier provided by Nagiro is one of the best.

1 Aspects of the invention 1 (Configuration) The present invention is based on a smoke detection JFJ tl gas sensor, 7T.
1. Compare the dirt reference value before operation with the dirt value detected by the sensor. te f・me setting (, ta judgment level t
Turn on the fan if it is too loud! In an air purifier that uses PIJ to purify the air in a room, when the 77-ton stop occurs, a comparison means is used to compare the dirt value that detects the level of dirt in the room with the dirt reference value for a 7-ton operation. and a correction means for increasing the judgment level by multiplying the judgment level by a correction coefficient when the dirt value when the fan is stopped is larger than the dirt reference value, so that the comparison means can detect the indoor dirty barracks when the fan is stopped. The detected contamination value is compared with the contamination standard value before fan operation, and if the contamination value is larger than the contamination standard value, the determination level is multiplied by the correction coefficient by the correction means to increase the determination level value, and the gas This is characterized in that the sensor sensitivity is kept almost constant even at one point per it% of the concentration.

(Example) Embodiments of the present invention will be described below with reference to the drawings.

Figure 5 shows a cutaway perspective view of the air purifier.The front of the main body 1 is provided with a suction port 2 for sucking in air, and the top surface is equipped with a fan driven by a motor to discharge the air drawn in. A discharge port 3 is provided. In addition, an operation 11s6 is arranged on the inclined surface of the upper front surface of the main body 1, and a gas sensor 4 is located inside the slit 5 on the opposite side of the cutting part 6.
is placed.

Figure 1@2 shows a block diagram of the air purifier, and the output of the gas sensor 4 is input to the input terminal A/D of the arithmetic control section 7 consisting of a microcomputer. The arithmetic control unit 7 outputs three types of 4rt numbers, [weak 1, [standard 1, and I rapid 1], depending on the gas concentration in the room. 1. The receiver switching circuit 8 is controlled by the signal to control the rotation of the receiver 9. I'm here.

As shown in the relationship between gas concentration and output voltage in the fpJz diagram, the output of the gas sensor 4 has a relationship in which the higher the gas concentration, the higher the output voltage. It is directly connected to the input terminal A/D of the 1111 section 7. The output of this gas sensor 4 is normally low and stable under clean air conditions, and the output voltage increases when the concentration of gases such as cigarettes increases.

Here, the fan (motor 9) operation tR1 of the calculation control unit 7
To explain the initial f1 constant processing, the basic operation is to detect the amount of change in the output voltage and to switch the operating mode based on the amount of change.

FIG. 4 shows a block diagram of the arithmetic and control unit 7, which stores the output voltage in the gas sensor 4 or C].

j2, accumulators 11 and 13 that calculate the dirt combination, that is, the amount of change after a certain period of time; comparator 1 that compares the dirt value of the accumulator 11 with a preset reference value;
4,15. IG and a timer 17.18. which forces the timer operation when the amount of change becomes small.
It is composed of 19 mag. The arithmetic control unit 7 also includes a RAM 21 that stores a dirt value that detects the degree of dirt in the room when the fan is stopped, an accumulator 22 that calculates the dirt value and a dirt reference value before 7T, and an accumulator 22 output. A comparator 23, which is a comparison means that outputs a signal when F is above a certain value, and a comparator 23 which is a comparison means that outputs a signal when the fan is stopped F, and when the contamination value at the time of the fan stop F is greater than the contamination reference value, the determination level is multiplied by a correction coefficient to increase the value of the determination rail. A correction means 20 is provided.

FIG. 1(a) shows the change in the output of the gas sensor 4 and the fan operating state in response to cigarette smoking, and FIG. 1(b)
indicates the operating mode status.

The following table shows the judgment level values for each driving mode.

Normally, the reference voltage for determining the amount of change in the output of the gamma sensor 4 is updated at fixed time intervals, and Vsmin at the fixed time is stored in RAM10 as the reference value. As shown in Figure 1, the contamination standard value before fan operation is
When smoking a cigarette from point A, the gas concentration due to the cigarette increases, so the output of the gas sensor 4 increases, and the dirt reference value before operation and the updated dirt value are calculated by the achiemulator 11. When this calculation result, that is, the amount of change, reaches the fan operation determination level shown in the table above, the operation mode is sequentially switched to weak operation, standard operation, and rapid (strong) operation according to the amount of change.

This operation mode switching is performed using the fan plater 14°15.
It can be determined by 16. Then, when the gas concentration in the room becomes saturated and the change II7 decreases by stopping smoking, forced timer operation is started and fan operation is ended after a certain period of time. This operation is performed by the RAM 12 and the accumulator 13. The accumulator 13 completes the calculation, and when the value, that is, the amount of change is small, one of the timers 17, 18. is set and the timer is operated.

When the fan operation ends, the V shown in the f51 diagram immediately after the end
It is stored in the RAM 21 using s2 as a reference value. At this time, the dirt standard value V91 before the 77th turn and the V after the end,
The Akiemulator 22 calculates V sz/V Sl, and the comparator 23 compares the calculation result with a predetermined value. If the value is above a certain value, the original state with low gas concentration is restored. If not, the correction means 20 makes corrections to raise the fan operation determination level.

For example, if the correction coefficient is B and the determination level in the case of weak driving is 0.9, it is performed as follows: 0.9XB<1.0. As a result, for example, the amount of change in concentration when smoking 11 cigarettes in clean air and the same amount of change when smoking one cigarette in dirty air is smaller in the latter case, but fan operation judgment Since the level is set to high, it is set so that the apparent sensitivity is higher than that.

Is there a process to increase the fan operation judgment level as described above?
l&! If this occurs several times in a row, the coefficient times the coefficient times the coefficient times..., the determination level exceeds 1, and the fan operation becomes a continuous operation. Set the number of times the coefficient has been multiplied in the counter, and if the number of times multiplied by the coefficient is repeated multiple times in a row, 1 after a certain number of times.
A certain correction is applied at a judgment level that does not exceed . With this configuration, continuous operation (malfunction) will not occur even if the sensitivity correction process is repeated multiple times in succession.

Also, by comparing Vs and Vs2, Vsl≧Vs2
If this happens, the above correction will be canceled.

In addition, if the process of raising the fan operation judgment level continues a certain number of times, it means that the air in the room (with a high lfx concentration) is dirty, and a display will be displayed to forcibly notify the user of this condition. is blinking. The display may be the operation section 6 of the main body 1, or may be located at another location.

Therefore, when the sensitivity correction process is repeated several times in succession, by blinking the display, it is possible to notify the user of the air pollution status in the room. If a sign appears on the display, the room can be completely cleaned by ventilating the room by opening the window or otherwise.

[Effects of the Invention] As described above, the present invention includes a gas sensor for smoke detection, and compares the dirt reference value before fan operation with the dirt value detected by the gas sensor, and detects when the dirt value is higher than a preset judgment level. In an air purifier that cleans the air in a room by driving a fan, the above-mentioned method includes: a comparison means for comparing a dirt value detected for indoor dirt coexistence when the fan is stopped with a dirt reference value before the fan is operated; If the dirt value when the fan is stopped is larger than the dirt reference value, the judgment level is multiplied by a correction coefficient and the judgment level is increased. The detected dirt value is compared with the dirt reference value before fan operation, and if the dirt value is larger than the dirt reference value, the correction means multiplies the judgment level by a correction coefficient to increase the judgment level. This is achieved by keeping the sensor sensitivity almost constant even in areas with high concentrations of smoke, and in this way, the sensitivity of detecting cigarette stains remains constant regardless of the environmental conditions in which the air purifier is placed. It is something to play.

[Brief explanation of the drawing]

tjSi diagram is an operation explanatory diagram showing the output change of the gas sensor and the operation of the air purifier according to the embodiment of the present invention, FIG. 2 is a block diagram of the same as the above, and FIG. FIG. 4 is a block diagram of the arithmetic and control unit shown above, and FIG. 5 is a perspective view of the air purifier shown above. 4 is a gas sensor, and 20 is 'MJE: f-stage. Agent Patent Attorney Ishi 1) Ai Nanashibishihe Tokyuya〉

Claims (3)

[Claims] (1) Equipped with a gas sensor for smoke detection, compares the dirt reference value before fan operation with the dirt value detected by the gas sensor, and if the value is higher than a preset judgment level, drives the fan to remove the air in the room. In an air purifier to purify, there is a comparison means for comparing a dirt value detected in the room when the fan is stopped and a dirt standard value before the fan operation, and a comparison means that compares a dirt value detected when the fan is stopped and a dirt standard value before the fan is stopped, An air purifier comprising: a correction means for increasing the judgment level by multiplying the judgment level by a correction coefficient when the judgment level is large. (2) The air purifier according to claim 1, wherein the determination level is kept constant when the correction coefficient occurs multiple times in succession. (3) The air purifier according to claim 1, wherein a ventilation sign is displayed when the correction coefficient exceeds a certain number of times.