JPH01236912A - Air cleaner - Google Patents

Abstract

PURPOSE:To make a response of a foulness detector of an air cleaner quicker by arranging a pre-detection device for driving a fan in accordance with an ascent of air foulness. CONSTITUTION:A main body 1 of an air cleaner is equipped with a fan, a detection device for detecting an air foulness and a control device for driving the fan when an output signal from the detection device exceeds a reference value. Furthermore, the main body 1 is also equipped with a pre-detection device, which outputs a signal for driving the fan in accordance with an ascent of the air foulness before it reaches the reference value. Therefore, the fan is driven by detecting the air foulness before it reaches the reference value with the aforementioned pre-detection device. A circulating wind in a room is generated by this operation and the air foulness is judged again by the original reference value, resulting in a speedup of an action of the detection device.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention is based on 'g! It has a sensor that detects air pollution,
This relates to an air purifier that can be operated automatically.

[Prior Art] Fig. 8 shows the operating mode of a conventional air purifier that has a sensor that detects air pollution and is capable of automatic operation. 8th
In the conventional example shown in the figure, when air pollution increases with respect to a certain reference value Vsl, the sensor output signal also increases, and the operation mode is changed according to that value. In other words,
This is an automatic operation type in which when the sensor output becomes Vsnl, the fan is operated in weak mode, when it becomes Vsn2, the fan is operated in standard mode, and when it becomes Vsn3, the fan is operated in rapid mode. A sensor that detects air pollution is attached to the body of the air purifier.

Therefore, it is not detected unless the dirty air reaches a part of the sensor of the air purifier. In a normal usage environment, the air near humans is the most polluted. For example, when you smoke in your room, the air in the area where people smoke is often contaminated with cigarettes.
Until this air goes to the air purifier, indoor convection air,
This was due to diffusion, etc. Therefore, even if the area around a person is dirty, this dirt does not reach the air purifier immediately, so the detection sensitivity of the sensor is poor, and there are high expectations for a faster response.

[Problems to be Solved by the Invention] The present invention has been provided in view of the above-mentioned points. When the air around people becomes polluted, the fan is operated in a state below the original standard value. The purpose of the present invention is to provide an air purifier that generates circulating air indoors, determines the degree of contamination using a new original standard value, and speeds up the detection operation of a detection means.

Means for Solving Problem 1] [Operation 1] The present invention includes a fan, a motor that drives the fan,
An air purifier comprising a detection means for detecting dirt in the air, and a control means for operating a fan by a motor when an output signal from the detection means exceeds a predetermined reference value. By providing a preliminary detection means that outputs a signal to operate the fan in response to an increase in the degree of contamination in the air, the preliminary detection means detects the degree of contamination in the air before a predetermined reference value and activates the fan. The device is characterized in that it operates to generate circulating air in the room, and then determines the degree of contamination based on the original standard value, thereby speeding up the detection operation of the detection means.

[Example] Hereinafter, an example of the present invention will be described with reference to the drawings. Fourth
As shown in the figure, the gas sensor output changes in proportion to air pollution. When performing automatic operation using this gas sensor, the operating mode is selected based on how the gas sensor output changes with a certain point Vs+ (FIG. 1) of the gas sensor output as a reference value. As shown in Figure 1, when the gas sensor output becomes Vsnl, the fan operation becomes weak mode, when the gas sensor output becomes VS112, it becomes standard mode, and when it becomes Vsn3, it becomes rapid mode.

In an air purifier having the above-described automatic operation mode pattern, when considering normal usage conditions, the location where the air is contaminated does not necessarily match the location where the air purifier is installed. In other words, if you smoke cigarettes etc. at a MS shop,
The air in places where people smoke cigarettes is often polluted, but it takes a gradual increase over time for this dirt to show up as a change in the gas sensor output, as shown in Figure 1. Taking into account this phenomenon in which the gas sensor output gradually increases, the fan is forcibly rotated at the Vsno point of the gas sensor output to create a circulating wind of indoor air, and this circulating wind is used to create a flow of indoor air. It carries dirty air to the air purifier. Then, the gas sensor output increases and quickly reaches the level of Vsnl, and the air purifier quickly enters automatic operation mode.
At point o, the fan is forcibly rotated, and this time is determined to be open at a certain time t, as shown in FIG. 1(b).

Within this certain period of time, even if the dirty air carried by the circulating air produced by the air purifier reaches the air purifier, the level of dirt will be V.
If it is less than sn1, the fan will stop within the time and the automatic operation mode will not be entered. The sensor detection pattern described above is referred to as preliminary detection.

There are two methods for this preliminary detection as follows. One of them is, as shown in Figure 1, the output of the gas sensor starts to rise from the reference value Vsl due to cigarette smoking, etc., and Vsn
. If so, the method is to force the fan to run for an hour. Another method is to open at a certain time, as shown in FIG. The increase in the output of the gas sensor (amount of change B■/Ott.) within the specified change amount B■. If it is larger (Otsu V
/Fto≧Otsu■. ) is a method of forcing the fan to rotate.

Examples will be specifically described below. Fig. 6 shows a cutaway perspective view of the air purifier, in which a suction port 2 for sucking air is provided on the front of the main body 1, and a discharge port on the top surface for discharging air sucked in by a fan driven by a motor. 3 is a provision. Further, an operating section 6 is arranged on the inclined surface of the upper front surface of the main body 1, and a gas sensor 4 serving as a detection means is arranged inside the sensor cover 5 on the opposite side from the operating section 6. . FIG. 3 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. When the output of the gas sensor 4 corresponding to the indoor gas concentration satisfies either of the conditions Vsno and 3t0≧13v0, the arithmetic control unit 7 controls the motor switching circuit 8 using this signal to turn the motor 9 on. The rotation is controlled only for time t. At this time, when the output of the gas sensor 4 increases due to indoor circulation, it outputs three types of signals: "weak 1", "standard", and "rapid", and these signals control the motor switching circuit 8. , the rotation of the motor 9 is controlled.

The output of the gas sensor 4 is in a relationship such that the higher the gas concentration, the higher the output voltage, as shown in the relationship between the gas concentration and the output voltage in FIG.
It is directly connected to D. The output of the gas sensor 4 is normally low and stable under clean air conditions, and as the concentration of gas such as tobacco increases, the output voltage increases.

Here, to explain the determination process for starting the operation of the 7γ motor (motor 9) by the arithmetic control unit 7 that constitutes the control means, the basic operation is to detect the amount of change in the output voltage and switch the operation mode based on the amount of change. is based on. FIG. 5 shows a block diagram of the arithmetic control unit 7, which includes a RAMI O, 12 that stores the output voltage from the gas sensor 4, and an accumulator 1 that calculates the amount of change in the contaminants after a certain period of time.
1, 13, Comparator 14, 15° 16 for comparing the preset reference value and the dirt value from the 7-cumulator 11
It is composed of timers 17, 18, 19, etc. that forcefully operate the timer when the amount of change becomes small. Also, the amount of change in gas sensor 4 is Vsn6 or 4V/711t, ≧B■. It is composed of a comparator 25 that compares whether the fan has reached 000, and a timer 26 that forces the fan to operate only for the specified time.

Incidentally, the comparator 25 and the timer 26 constitute a preliminary detection means.

In addition, the arithmetic control unit 7 includes a RAM 21 that stores a dirt value that detects indoor dirt coexistence when the fan is stopped;
an accumulator 22 that calculates the dirt value and a dirt reference value before fan operation; a comparator 23 that is a comparison means that outputs a signal when the output of the accumulator 22 is above a certain value; and a comparator 23 that calculates the dirt value when the fan stops. A correction means 20 is provided which increases the determination level by multiplying the determination level by a correction coefficient when the determination level is larger than the reference value.

(a) of Fig. 1 and #IJ2 shows the change in the output of the sensor 4 and the fan operating state in response to cigarette smoking, and (b) of Fig. 1 and #IJ2 shows the state of the operating mode. There is. 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 gas 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 Figs. 1 and 2, when the dirt reference value before fan operation is s1, and you smoke a cigarette from point A, the γ-s concentration due to the cigarette increases, so the output of the gas sensor 4 increases. Then, the dirt reference value before operation and the updated dirt value are calculated by the 7-cumulator 11. When this calculation result, that is, the amount of change, reaches the operation judgment level shown in the table above, it is possible to select primary forced fan operation, weak operation, standard operation, or rapid (
Strong) Switch the operation mode according to the amount of change in operation and sequentially. This operation mode switching is performed by the comparator 25.
It can be determined by 14, 15, and 16. And quit smoking 1: Therefore, the indoor gas concentration becomes saturated,
When the amount of change decreases, forced timer operation starts and fan operation ends after a certain period of time. This operation is performed in RAM1
2 and 7 accumulator 13, accumulator 1
3, and if the value, that is, the amount of change is small, timers 17, 18, and 19 are set and operated.

When the fan operation ends, Vs2 shown in FIGS. 1 and 2 immediately after the end is stored in the RAM 21 as a reference value. At this time, the accumulator 22 calculates the dirt reference value Vs before 7-en luck and Vs2 after the end, Vs2/Vs, and the calculation result is compared with a predetermined value in the hump parator 23. If it is above a certain value, that is, if the original state of low gas concentration has not been restored, the correction means 20 makes a correction in the direction of increasing the 77-operation determination level. For example, if the correction coefficient is B, and the judgment level for weak driving is 0.9, 0.9XB<1.0
For example, if you smoke one cigarette in clean air, the amount of change in concentration will be smaller than if you smoke the same cigarette in dirty air. However, since the fan operation determination level is set high, the apparent sensitivity is set to be upward.

As shown above, set the fan operation judgment level to "weak" or "standard".
By adding a "forced fan operation" function to the conventional main unit function, which has 3 stages of ", speed", the air purifier creates circulating air and removes dirty air from the sensor part of the air purifier. The sensor is carried along with the current of the wind to speed up the sensor operation. In other words, the dirt reference value before the fan operation is compared with the dirt value detected by the gas sensor 4,
Alternatively, compare the amount of change, and if the sensor 4 output tends to rise above the standard value, forcibly rotate the fan by - degrees to create circulating air in the room by the wind from the discharge port 3. In addition, the degree of contamination is detected on a part of the sensor, and if the degree of contamination is higher than a preset determination level, the fan is driven in automatic operation mode to clean the air in the SU. Further, even if the fan is forcibly rotated by − degrees before the determination level, if the output of the gas sensor 4 does not rise to the determination level, the fan is turned off after L time.

Then, it waits until it reaches the preliminary detection level V SnQ again. Incidentally, FIG. 7 shows this state.

[Effects of the Invention] As described above, the present invention includes a fan, a motor that drives the fan, a detection means for detecting dirt in the air, and an output signal from the detection means that exceeds a predetermined reference value. In the air purifier, the air purifier is equipped with a control means for operating the 7-ton by a motor, and a preliminary detection means for outputting a signal for operating the 7-ton in response to an increase in the degree of dirt in the air before the predetermined reference value. Since the preliminary detection means detects the level of dirt in the air before the predetermined standard value and operates the fan, it creates circulating air in the room and detects the level of dirt at the final standard value. The present invention has the effect of being able to determine the degree of air pollution and hasten the detection operation of the detection means, thereby operating the air purifier at a stage when there is little indoor dirt, that is, providing an air purifier with high detection sensitivity. It is.

[Brief explanation of the drawing]

Fig. 1 is an operational explanatory diagram showing changes in the output of the gas sensor and the operation of the air purifier in an embodiment of the present invention, and Fig. 2 is an illustration of changes in the output of the gas sensor and the operation of the air purifier in another embodiment of the same. FIG. 3 is a block diagram of the same as above; FIG. 4 is a characteristic diagram showing the relationship between the gas concentration and output of the gas sensor of the same; FIG. 5 is a block diagram of the calculation control section of the same as above; Figure 6 is a perspective view of the same air purifier as above, Figure 7 is an explanatory diagram when the same preliminary detection as above is performed to generate circulating air, and Figure 8 is the change in the output of the conventional gas sensor and air purification. It is an operation explanatory diagram showing the operation of the device. 9 is a motor. Figure 3 Figure 4 φ'X: JLA (PPM)

Claims (1)

[Claims] (1) A fan, a motor for driving the fan, a detection means for detecting dirt in the air, and a control means for operating the fan by the motor when the output signal from the detection means exceeds a predetermined reference value. In an air purifier comprising:
An air purifier comprising preliminary detection means for outputting a signal for operating a fan in response to an increase in the degree of dirt in the air before the predetermined reference value.