JPH02102711A - Air cleaner - Google Patents

Abstract

(57) [Abstract] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a method for detecting when to replace a deodorizing filter of an air purifying device.

[Conventional technology]

Figures 5 and 6 are an example of Japanese Patent Application Laid-Open No. 61-20573.
In Figure 2, which is a cross-sectional view and a circuit diagram showing a conventional air purifier shown in Publication No. 11, (1) is a main body having a duct structure, (2) is an intake port thereof, (3) is an exhaust port, (4)
is a fan motor, (5) is a fan, and (6) is an air purifying filter with dust collection and deodorizing functions (hereinafter referred to as the filter).
, (6a) is a dust collection filter, (151)) is a deodorizing filter, (7: is a gas sensor, (8) is a calculation unit (9)
) and a control unit Q (I. All is a triac, and a is an AC power supply.

Conventional air purifiers are constructed as described above.2 For example, when the air becomes dirty, the calculation section (9) reads the output of the gas sensor (71) whose resistance value changes depending on the gas concentration, and calculates a predetermined ratio value. When the above is completed, a signal is sent to the control unit ae.The control unit +1 (I) controls the conduction of the triac av in order to operate the fan motor (4). )
and starts air purification operation.

Furthermore, as the air becomes cleaner, the output of the gas sensor (7) decreases. When this output value becomes less than a predetermined value, the arithmetic unit (9) sends a signal to the control unit QQ. In order to stop the control unit or the fan motor (4), the triac t1υ is controlled to be turned off, thereby stopping the supply of power to the fan motor (4).

[Problem to be solved by the invention]

With such a conventional configuration, if the air purifier is running continuously, the amount of contamination may be too high.

There was a problem that the filter continued to be used without knowing whether it was because the dust collection and deodorizing ability of the filter had decreased and the dust collection and deodorization could not be completed.

This invention was made to solve the above-mentioned problems, and an object of the present invention is to provide a deodorizing filter replacement timing detection device that allows a user to recognize that the filter should be replaced when the deodorizing ability of the deodorizing filter has decreased. It is said that

[Means to solve the problem]

An air purifying device according to the present invention includes a main body having an inlet and an exhaust port, an air purifying filter provided opposite to the inlet, and an air purifying filter provided in the main body to direct air purified by the filter to the exhaust port. A fan for supplying air from the filter to the outside, an odor sensor installed before and after the filter to detect the concentration of odor, a control means for calculating a signal from the sensor, and a display means for displaying an image according to the calculation result of the control means. It is something that

[Effect]

The air purifying device according to the present invention compares the odor output on the upwind side of the filter and the odor output on the leeward side after passing through the deodorizing filter, and when the difference between them exceeds a predetermined value, displays the display means. By displaying it, you will be notified when it is time to replace it.

〔Example〕

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

In FIG. 1, (1) to (6) are the same as in the conventional example. I is an odor sensor using an oxide semiconductor whose resistance value changes depending on the concentration of odor, and σ is installed upwind of the deodorizing filter (6b). Arranged. Odor sensor with the same performance as odor sensor α4, αG is a deodorizing filter replacement time warning light, aη
1 is a control device consisting of a calculation processing unit which compares and calculates the voltage output from the odor sensor α and α, and a control unit a9 which determines whether or not to output to the warning light aS based on the calculation result.

FIG. 2 is a diagram showing that the output of the odor sensor increases as the odor concentration increases.

FIG. 3 shows a block diagram of the circuit, and FIG. 4 shows a flow chart.

To explain the secondary operation in the above configuration, when the fan motor (4) drives the fan motor (4), dirty air flows into the main body CD through the suction grill (2). At this time, the dust is removed by the dust collection filter (6a)
The dust is collected by the deodorizing filter (6b), the odor is deodorized by the deodorizing filter (6b), and the dust and deodorized air is sent to the exhaust port (3)
more excreted.

In addition, the odor sensor α4.a5 installed upwind and downwind of the deodorizing filter (6") has a characteristic that the output value changes depending on the odor intensity, as shown in Figure 2. If the deodorizing filter (6b) has a deodorizing effect, the output value (■a41) of the odor sensor I located upwind will be higher than the output value (VaS) of the odor sensor α9 located downwind, so
(l: ΔV in the formula is ΔV) becomes 0.

ΔV = V (14)-”17 a!9
(11 As the deodorizing effect decreases, the difference between upwind and leeward odors becomes smaller, so Δ■ approaches zero.

When the deodorizing effect disappears, the deodorizing filter starts emitting odor again, and ΔV becomes zero or negative.

This calculation is performed by the arithmetic processing unit -, and when ΔV becomes zero or negative, a signal is sent to the control unit ttS to turn on the warning light αG.

〔Effect of the invention〕

As described above, the present invention provides a main body having an inlet and an exhaust port, an air purifying filter provided opposite to the inlet, and an air purifying filter provided in the main body to transmit air purified by the filter to the main body. A fan that supplies air from an exhaust port to the outside; an odor sensor that is installed before and after the filter to detect the concentration of odor; a control means that calculates a signal from the sensor; and a display that displays according to the calculation result of the control means. Since the structure is equipped with the means, it is possible to accurately warn the time to replace the deodorizing filter.

[Brief explanation of the drawing]

FIG. 1 is a sectional view showing an air purifying device according to an embodiment of the present invention, FIG. 2 is a diagram showing the relationship between odor concentration and odor sensor output, FIG. 1 is a circuit block diagram of the above, and FIG. FIG. 5 is a sectional view showing a conventional air purifying device, and FIG. 6 is a circuit diagram of the same. In the figure, <11 is the main body, (2) is the suction port, and (3)
is the exhaust port, (5) is the fan, and (6a) is the dust filter (
(6b) is a deodorizing filter (air purification filter), α41α9 is an odor sensor, α8 is a warning light (display means), α7! is the control device. Note that the same reference numerals in each figure indicate the same or corresponding parts.

Claims (1)

[Claims] A main body having an inlet and an exhaust port, an air purifying filter provided opposite to the inlet, a fan provided in the main body that supplies air purified by the filter to the outside from the exhaust port, and the filter. An air purifying device, which is provided before and after the odor sensor, and includes an odor sensor for detecting odor concentration, a control means for calculating a signal from the sensor, and a display means for displaying a display according to the output of the control means.