JP2512122B2 - air purifier - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to an air purifier that detects gas components in air and automatically operates.

2. Description of the Related Art A general structure of a conventional air purifier of this type will be described below with reference to the drawings.

In FIG. 7 and FIG. 8, the main body 21 has a built-in electric blower 22, and the air sucked from the intake port 23 provided in the front surface passes through the pre-filter 24 and is ionized by the discharge wire 25 and the counter electrode 26. After the dust is adsorbed by the filter 27, it is discharged from the exhaust port 28 on the upper surface. Operation switch 30 and display
The operation unit 29 provided with 31 is detachably attached to the upper portion of the main body 21. The operation unit 29 is for operating the electric blower 22 and displaying the air volume thereof. Reference numeral 32 is a gas sensor for detecting that the indoor air is dirty. The main body 21 has a control circuit 33 that performs automatic operation according to the output of the gas sensor 32 when the operation switch 30 is set to the automatic operation position. 34 is a power cord.

Explaining the circuit system with reference to FIG. 9, operation switches
When set to automatic operation mode by 30, the gas sensor
The output of 32 is input to the control circuit 33 via the detection circuit 36,
The control circuit 33 makes a judgment and applies a high voltage between the electric blower 22 and the counter electrode 25 and the discharge line 26, and a high voltage power supply 35 and a display unit 31.
Control.

Here, for example, when the output of the gas sensor 32 changes as shown in FIG. 10 and the automatic operation mode is set by the operation unit 29, as shown in FIG. 11, the strength of the electric blower 22 is increased according to the dirt. The automatic operation is performed by selecting a predetermined operation mode for the length and time. Also, if dirt becomes large during operation, the mode value is updated to a larger value and restarted in the updated mode, but it is not updated to a smaller mode. That is, at the time of a1, the control circuit 33 determines the mode and controls the electric blower 22, the power supply and the display unit 31, but at the time of b1, the control circuit 33 determines the mode and newly starts the operation of the mode. Similarly, at the time of c1, the mode operation is newly started, and ends when the specified time comes. Here, the gas sensor 32 that cannot be removed by the filter 27 ends because the decrease in the output of the gas sensor 32 may be small even after the stipulated time due to the influence of the increase in the components to be detected and the sudden change in temperature and humidity. At time d, the reference value is updated to D so that it becomes the same value as the output value of the gas sensor 32 at that time.

DISCLOSURE OF THE INVENTION Problems to be Solved by the Invention In the configuration of the conventional air purifier, even though the fouling stage and the air volume are displayed according to the output of the gas sensor, it is displayed that the gas concentration is high near the end. There is a problem that the electric blower may stop or the fouling stage may change all at once. Therefore, there is a problem that the algorithm for automatic operation is inappropriate.

The present invention solves the above-mentioned conventional problems, and an object thereof is to provide an air purifier that performs a stop without any discomfort when the operation is stopped, corresponds to a set sensitivity, and performs an operation that immediately responds to dirt in the room. .

Means for Solving the Problems In order to achieve the above object, it is detected that the output of a gas sensor for detecting dirt in a room is saturated, and the reference value is raised at predetermined time intervals from the saturation, The value increase range is set to a different value for each sensitivity, and the increase value is set to a value below the range of the dirt level judgment value, and the dirt level and the rotation speed of the electric blower are determined by the relative increase amount between the output of the gas sensor and the reference value. Use automatic operation control algorithm.

Action The above-mentioned means determine the dirt and air volume depending on the set sensitivity of the gas sensor, so that you can get a feeling of use according to the sensitivity, and you can stop it with a natural feeling, and an improved air purifier. Could be provided.

Embodiment An embodiment of the present invention will be described below with reference to the drawings.

In FIG. 1 and FIG. 2, the main body 1 has an electric blower 2 built-in, and the air sucked from an intake port 3 provided in the front surface passes through a pre-filter 4 and is ionized by a discharge wire 5 and a counter electrode 6, After the dust is adsorbed by the filter 7, it is discharged from the exhaust port 8 on the upper surface. Operation switch 10 and display
The operation unit 9 provided with 11 is detachably attached to the upper part of the main body. The operation unit 9 is for operating the electric blower 2 and displaying the air volume thereof. Reference numeral 12 is a gas sensor for detecting that the indoor air is dirty. In addition, if the operation switch 10 is set to the automatic operation position in the main body 1, the gas sensor
A control circuit 13 that performs automatic operation according to the output of 12 is internally provided. 14 is a power cord.

The circuit system will be described with reference to FIG.
The electric blower 2 is driven by receiving a signal from the operation unit 9 including the operation switch 10. When the automatic operation is set, the output of the gas sensor 12 is input to the control circuit 13 via the detection circuit 16 and a high voltage is applied between the electric blower 2 and the counter electrode 5 and the discharge line 6. The power supply 15 and the display unit 11 are controlled.

The operation of the above configuration will be described. FIG. 4 shows changes in the output of the gas sensor 12. As shown in this figure, the decrease in the output of the gas sensor 12 may be reduced. This is because there is a difference between the components that can be removed by the filter 7 and the components that the gas sensor 12 detects. The filter 7 mainly removes dust and dirt and a specific odor, and the gas sensor 12 uses ethanol, methane, This is because it reacts with carbon monoxide and the like. When there is a component that cannot be removed by the filter 7, no matter how much the electric blower 2 is operated, it is useless. Therefore, when the gas sensor 12 cannot remove the component and the temperature and humidity change suddenly. If the output of the gas sensor 12 does not decrease much after the specified time from the peak time due to the influence, the reference value is increased every specified time t1 by the judgment algorithm of the microcomputer, and the strength of the electric blower 2 is changed according to the difference. Then, the reference is updated and stopped until the difference becomes equal to or lower than the level at which the electric blower 2 is operated. In this embodiment, since the difference from the reference value is gradually reduced, the display also gradually decreases, and finally the display becomes 0 and the display stops. Even if there is a component that cannot be removed by the filter 7, it naturally stops the operation and the feeling of use is good.

Further, as shown by the broken line, when the output of the gas sensor 12 decreases before the specified time and the difference from the reference value becomes less than or equal to the level at which the electric blower 2 is operated, the reference value does not increase.

Here, if the set sensitivity is divided into, for example, high, medium, and low three levels, the dirt level determination and the air volume setting are made different as shown in FIG. 5, and the sensitivity (high) is an electric blower with a small relative difference. 2 starts to start, and the strength of the air volume also tends to increase. If the relative difference in sensitivity (low) does not become larger, the electric blower 2 will not start and the air volume will not easily increase. The user may set the sensitivity to (high) if it is better to start the electric blower 2 with less dirt, and set the sensitivity to (low) if it is not necessary to start the electric blower 2 if there is no dirt. . Therefore, by changing the value of the reference value increase value according to the set sensitivity, the judgment of the dirt stage relative to the relative difference and the setting of the air volume will be made according to the sensitivity, so that the actual feeling of use is good and the air cleaning is easy to use. Can be provided.

Fig. 6 shows a concrete example of the judgment of the dirt stage and the setting of the air volume. This figure digitizes the relative difference value (analog change from 0V to 5V) between the output of the gas sensor 12 and the reference value. It was done (1 count = about 20 mV). Assuming that the relative difference value is 9, the stain stage is 3. As mentioned above, the reference value rises every specified time t1,
The increase value should be less than or equal to the set range of the dirt level determination value (2 areas of the dirt level 3 range from 10 to less than 12). Then, if there is no decrease in the output of the gas sensor 12, the dirt level does not change by two or more steps when the reference value is updated every specified time t1, and the difference from the reference value is gradually decreased step by step. Therefore, the display gradually decreases, and finally becomes 0 and stops. Even if components that cannot be removed by the filter 7 remain in this way, the indication of the contamination stage is automatically set to 0.
It is easy to use because it is turned on or stopped.

EFFECTS OF THE INVENTION As described above, according to the present invention, even if the output of the gas sensor does not change due to residual gas components detected by the gas sensor that cannot be removed by the filter of the air purifier and fluctuations in temperature and humidity. It was possible to provide an air purifier that naturally does not show a dirty stage display and does not perform a wasteful operation due to a stoppage. In addition, the air purifier operates according to the degree of operation desired by the user due to its sensitivity, it has a good feeling of use, there is no change in the display and air volume, and it is a natural air cleaner that is suitable for use. Was provided.

[Brief description of drawings]

FIG. 1 is an external perspective view of an air purifier in an embodiment of the present invention, FIG. 2 is the same sectional view, FIG. 3 is a block diagram of the same control circuit, and FIG. 4 is an output change detection diagram of a gas sensor. FIG. 5 is a graph showing a fouling stage determination level of the relative difference between the gas sensor and the reference value, FIG. 6 is a graph showing a fouling stage determination level of the relative difference between the gas sensor and the reference value, and FIG. 7 is a conventional air Fig. 8 is an external perspective view of the purifier, Fig. 8 is a sectional view of the same side, Fig. 9 is a block diagram of the circuit, Fig. 10 is an output change diagram of a conventional gas sensor, and Fig. 11 is a conventional automatic operation algorithm example. It is an explanatory view shown. 2 ... Electric blower, 13 ... Control circuit, 12 ... Gas sensor.

Claims (2)

(57) [Claims] 1. The output value of a gas sensor in clean air is stored as a reference value, and the determination of the rotational strength of an electric blower that operates based on the difference from the output value of the gas sensor according to the surrounding environment and the contamination stage. Equipped with an automatic operation control circuit that makes a judgment, detects that the output of the gas sensor has risen and is saturated, and raises the reference value at every predetermined time after a predetermined time after saturation, and relatively It has an automatic operation algorithm that reduces the difference between the output of the standard and the reference value, and updates the reference value until the difference falls below the level at which the electric blower operates. An air purifier characterized by different values. 2. The air purifier according to claim 1, wherein the rising value of the reference value is set to a value less than or equal to the value within the set range of the dirt level judgment value.