JP2512121B2 - 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. 5 and FIG. 6, the main body 21 has an electric blower 22 built therein, and the air taken in through 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. The operation unit 29 including the operation switch 30 and the display unit 31 is detachably attached to the upper portion of the main body. The operation unit 29 is for operating the electric blower 22 and displaying its strength. Reference numeral 32 is a gas sensor for detecting that the indoor air is dirty. In addition, 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.

The circuit system will be described with reference to FIG.
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. Then, the control circuit 33 includes an electric blower 22, a high voltage power source 35 for applying a high voltage between the counter electrode 25 and the discharge line 26, and a display section 31.
Control.

Here, for example, when the output of the gas sensor 32 changes as shown in FIG. 8 and the automatic operation mode is set by the operation unit 29, as shown in FIG. The automatic operation is performed by selecting a predetermined operation mode of strength 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 that the mode, electric blower 22, power supply and display unit 3
Although 1 is controlled, the control circuit 33 determines that the mode is the mode at the time of b1 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 22 that cannot be removed by the filter 27 is the gas sensor even after the specified time has elapsed due to the influence of the increase in the components to be detected and the sudden change in temperature and humidity.
Since the decrease in the output of 22 may be small in some cases, the reference value is updated to D at the end d so that it becomes the same value as the output value of the gas sensor 22 at that time.

However, when the manual mode is set, the reference value remains unchanged. When the manual mode is set up to the point E, the reference value is not updated and cannot be removed by the filter 27, but the gas sensor 22 is affected by an increase in components detected by the gas sensor 22 or a sudden change in temperature or humidity. In some cases, there is little decrease in the output, and when the manual mode is switched to the automatic operation mode at time E, there is a difference between the output of the gas sensor and the reference value, and it is determined that there is a lot of dirt, and the operation is immediately started.

Problems to be Solved by the Invention With the configuration of the conventional air purifier, it is determined that the contamination is small when the air mode is operated in the automatic mode until the time point E and the mode is switched to the manual mode at the time point E. On the contrary, when the manual mode is set up to the point E, the reference value is not updated and cannot be removed by the filter 27, but the gas sensor 22 is affected by an increase in components detected by the gas sensor 22 or a sudden change in temperature or humidity. There is a case where the output of 22 decreases little, and when the manual mode is switched to the automatic operation mode at time E even though the operation is sufficiently performed in the manual mode until time E, the output of the gas sensor and the reference value However, there was a problem that there was a lot of dirt and there was a lot of dirt and the operation started immediately, and there was a problem that the operation control algorithm was inadequate.

The present invention solves the above-mentioned conventional problems, and an object thereof is to provide an air purifier that performs appropriate operation control.

Means for Solving the Problems In order to achieve the above object, the present invention detects that the output of a gas sensor for detecting dirt in a room is saturated,
The reference value is raised at every predetermined time after saturation, and the automatic operation control algorithm that determines the strength of the electric blower by the difference between the output of the gas sensor and the reference value is also applied to the manual operation mode.

By the above-described means, it is possible to provide an air purifier that performs an appropriate operation without starting the electric blower even when the manual operation mode is switched to the automatic operation mode.

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 its strength. 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 for automatically operating according to the output of 12 is installed. 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, which cannot be removed by the filter 7, but the gas sensor 12 increases the amount of components that it detects, and when temperature and humidity change abruptly, the gas changes even after a specified time from the peak time. When the decrease in the output of the sensor 12 is small, the judgment value of the microcomputer is used to increase the reference value every specified time, and the strength of the electric blower 2 is changed according to the difference.
The reference is updated until the difference becomes equal to or lower than the level at which the electric blower 2 is operated. Here, when the output of the gas sensor 12 is also displayed as the degree of contamination, the same algorithm is used to process the output of the gas sensor 12 in the manual operation mode as well, so that the same contamination occurs when switching from the manual operation mode to the automatic operation mode. Is displayed, and operation is performed with an air volume corresponding to the amount of dirt. Conversely, even if the automatic operation mode is switched to the manual operation mode, the same stain is displayed because the processing is the same.

Also, in the conventional method, the reference is not updated during operation, so the display continues to show a high value and stops at the specified time, but if the reference value is updated at the time of stop, it will suddenly become 0 from the previous high value. And there is a feeling of strangeness. In this respect, in the present invention, the display for gradually decreasing the difference from the reference value also gradually decreases, and finally the display becomes 0 and stops. There is also an advantage that even if a component that cannot be removed by the filter 7 remains, it naturally comes to a stop 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 the level at which the electric blower 2 is operated, the reference value does not increase.

Therefore, it is possible to provide an air purifier that does not cause discomfort and appropriately purifies the air because different stains and air volumes are not shown when switching between modes.

EFFECTS OF THE INVENTION As described above, according to the present invention, it is possible to provide an air purifier that cleans air appropriately without causing discomfort because different dirt and air flow are not shown when switching modes.

[Brief description of drawings]

FIG. 1 is an external perspective view of an air purifier according to an embodiment of the present invention, FIG. 2 is a sectional view of the same, FIG. 3 is a block diagram of the same control circuit, and FIG. Explanatory drawing comparing air volume, FIG. 5 is an external perspective view of a conventional air purifier, FIG. 6 is a sectional view of the same side, FIG. 7 is a block diagram of the same circuit, and FIG. 8 is a conventional gas sensor. Output change diagram, No. 9
The figure is a diagram showing an example of a conventional automatic driving algorithm. 2 ... Electric blower, 12 ... Gas sensor, 13 ... Control circuit.

Claims (1)

(57) [Claims] 1. An automatic operation control circuit for storing the output value of a gas sensor as a reference value and determining 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. , When the output of the gas sensor rises and is detected to be saturated, the reference value is raised every predetermined time after a predetermined time from the saturation, and the difference between the output of the gas sensor and the reference value is relatively measured. It has an automatic operation algorithm that decreases the difference and updates the reference value until the difference becomes equal to or lower than the level at which the electric blower is operated.The automatic operation that sets the rotation speed of the electric blower with the output of the gas sensor An air purifier that has an operation mode and a manual operation mode that sets an arbitrary rotation speed, and updates the reference value with the same algorithm in both modes.