JPH04190824A - Control apparatus of air purifier - Google Patents

Abstract

PURPOSE:To purify air corresponding to the contamination degree of air regardless of the contamination of a filter by detecting the contamination of air and the contamination degree of a filter and correcting the resistance value of a gas sensor by a correction means. CONSTITUTION:The output level of a gas sensor 6 detecting the contamination of air is detected by a detection means 7 and the contamination degree of a filter 5 removing the contaminant of air is detected by an integrating counter 8. Further, a correction means 9 receives the signals outputted from both of the integrating counter 8 and the detect ion means 7 to correct the contamination degree of air. A resistance value becoming the standard of the contamination of the gas is stored in a memory means 10. Further, a comparing means 11 receives the signals outputted from both of the memory means 10 and the correction means 9 to judge the contamination degree of air. A control means 12 rotates a blower 14 on the basis of the signal outputted from the comparing means 11 or displays the contamination degree of air on a display means 13.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a control device for an air cleaner that detects air pollution and purifies the air depending on the air pollution.

Industrial Application Fields In recent years, air purifiers have become widely used to improve the indoor environment, and devices that use gas sensors to detect air pollution and operate automatically have appeared. ing.

Conventionally, a control device for this type of air cleaner was generally as shown in FIG. That is, using a gas sensor 1 whose resistance value changes depending on the gas concentration, the detection means 2 detects the degree of air pollution from the amount of change in the resistance value of the gas sensor 1, and inputs this signal to the control means 3 to determine the detection level. The air was purified by driving the fan 4 in response to the gas and causing the filter 5 to adsorb the gas. In addition, the gas sensor 1 is such that the amount of change in resistance value increases depending on the gas concentration, and the control means 3 sets the resistance value at a certain gas concentration (air that is considered to be clean) as a reference resistance value RO, and changes the resistance value to this value. The degree of contamination of the air is determined and output from the amount of change in the resistance value R at the current gas concentration.

Problems to be Solved by the Invention In such a conventional air purifier control device, some of the gas in the air adsorbed by the filter 5 is separated from the filter 5 and diffused into the air. be. As a result, the gas contamination detected by the gas sensor 1 becomes the sum of the gas in the surrounding air and the gas adsorbed by the filter 5, and the problem is that air contamination cannot be detected properly. was there.

The present invention solves the above problem, and aims to provide an air purifier control device that can purify the air according to the degree of air pollution, regardless of the degree of dirt in the filter. .

Means for Solving the Problem The first means for solving the problem of the air purifier control device of the present invention for achieving the above object is a gas sensor that detects air pollution, and a detector that detects the output level of this gas sensor. means, an integration counter for detecting the degree of contamination of a filter for removing dirt from the air, a correction means for correcting the degree of contamination of the gas by inputting signals output from the integration counter and the detection means, and a standard for the contamination of the gas. a storage means for storing the resistance value, a comparison means for inputting the signals output from the storage means and the correction means and determining the degree of air pollution, and an output based on the signal output from the comparison means. The second problem-solving means is to provide a main body counter for detecting the degree of contamination of the main body, and input a signal detected by the main body counter to the correction means. be.

Function The above-mentioned first problem-solving means operates in such a way that the gas sensor detects air pollution and inputs it to the detection means, the integration counter detects the degree of dirt on the filter, and the correction means outputs the information from the detection means and the integration counter. The resistance value of the gas sensor is corrected by inputting the signal outputted from the storage means and the correction means η by the comparison means. It is possible to determine the degree of contamination of the main unit and to change the output based on the signal output from the comparison means using the control means.The second problem-solving means also functions to correct the signal detected by the main body counter. The resistance value of the gas sensor can be corrected by inputting the signals output from the main body counter, the detection means, and the integration counter into the means.

EXAMPLES Hereinafter, examples of the present invention will be described with reference to the drawings. FIG. 1, FIG. 2, and FIG. 3 show an embodiment of the first problem solving means of the present invention. As shown in the figure, a detection means 7 detects the output level of a gas sensor 6 that detects air pollution, an integration counter 8 that detects the degree of dirt of a filter 5 that removes air pollution,
a correction means 9 that inputs signals output from the integration counter 8 and the detection means 7 and corrects the degree of contamination of the gas;
A storage means 10 that stores a resistance value serving as a reference for gas contamination, a comparison means 11 that inputs signals output from this storage means 10 and the correction means 9 to judge the degree of air contamination, and this comparison means The control means 12 is configured to change the output based on the signal output from the means 11. Note that 13 is a display means, and 14 is a blower device. Next, to explain the relationship between the gas concentration and the amount of resistance change of the gas sensor 6, the reference resistance value (clean air)
Let R be the resistance value of the air you want to detect in RO1, and let the amount of change in resistance value of air containing 11,000 pp of isobutane be 1, then the relationship between the gas concentration and the amount of change in resistance value is as shown in Figure 2. .

As is clear from this figure, what can be detected by the gas sensor 6 is relative to how much the gas concentration has changed with respect to a certain reference gas concentration.

Therefore, even if the reference gas resistance value RO varies, the amount of change in gas concentration can always be derived from the relationship R/RO. Therefore, the resistance value of the gas sensor 6 does not need to be detected as an absolute value, and the amount of change in gas concentration can be detected from the amount of change with respect to the reference gas concentration level. As a result, if the detection level at the reference gas concentration can be kept constant, the amount of change in gas concentration can always be detected with the same accuracy.

To explain the operation of the above configuration, first, the reference resistance value RO is input and stored in the storage means 10. Next, the comparison means 11 compares the reference resistance value RO stored in the storage means 10 and the resistance value R of the gas sensor 6 taken into the detection means 7 this time, and the output control means 12 The output contents of the display means 13 and the blower device 14 are changed. The dirty air is separated into gas and clean air by passing through the filter 5, the clean air passes through the air purifier and is exhausted, and the gas is adsorbed by the filter 5. By repeating this circulation, the air is purified.

The degree of air pollution at this time is determined based on the current resistance value of the gas sensor 6/reference resistance value, that is, R/RO. However, the gas adsorbed on the filter 5 is not completely adsorbed on the filter 5, but rather is separated from the filter 5 and diffused. This filter 5
The amount of gas diffused from the air purifier is small and has no effect on the room where the air purifier is used. However, since the filter 5 and the gas sensor 6 are installed adjacent to each other, this diffused gas is detected by the gas sensor 6 again. As a result, the resistance value of the gas detected by the gas sensor 6 is the gas R1 diffused from the dirty air filter 5, and as shown in FIG. The resistance lfbl moves in the direction.

Further, the gas diffused from the filter 5 changes depending on the degree of contamination of the filter 5, as shown in FIG.

Therefore, as shown in Fig. 1, the degree of contamination of the filter 5 is detected by an integration counter 8, this value and the output value of the detection means 7 are inputted to the correction means 9, and the correction means 9 extracts only the degree of contamination of the air. , the true current gas resistance value R is derived. By comparing the resistance value R of this gas with the reference resistance value RO, the degree of contamination of the air can be accurately detected, and based on the result, the blower 14 can be rotated, the display means 1
3 is displayed.

FIG. 5 shows an embodiment related to the second problem-solving means of the present invention, and in the figure, parts given the same numbers as in FIG. 1 are the same parts as those explained in the conventional example. ,
The explanation will be omitted. The difference from the first problem solving means is that a main body counter 16 is provided to detect the degree of contamination of the main body 15 of the air purifier, and the signal detected by this main body counter 16 is input to the correction means 17. This configuration has the effect that the resistance value of the gas sensor can be corrected by inputting the signals output from the main body counter, the detection means, and the integration counter, and the degree of air pollution can be determined more accurately.

Effects of the Invention As is clear from the description of the embodiments above, the air purifier control device of the present invention includes a gas sensor that detects air pollution, a detection means that detects the output level of this gas sensor,
An integration counter that detects the degree of contamination of a filter that removes air pollution, a correction means that inputs signals output from the integration counter and the detection means to correct the degree of gas contamination, and a resistor that serves as a reference for gas contamination. a storage means for storing the value; a comparison means for inputting the signals output from the storage means and the correction means to determine the degree of air pollution; and changing the output based on the signal output from the comparison means. It is possible to accurately judge the degree of air contamination regardless of the degree of contamination of the filter, and to improve detection accuracy.

[Brief explanation of the drawing]

FIG. 1 is a block circuit diagram of a control device for an air purifier according to an embodiment of the first problem solving means of the present invention, and FIG. 2 shows changes in gas concentration and resistance value of a gas sensor of the same control device. Fig. 3 is a relational diagram showing the change in gas concentration and the amount of change in resistance value of the gas sensor of the same control device, and Fig. 4 is a characteristic diagram of the dirt on the filter of the air purifier and the amount of gas detected by the gas sensor. 5 is a block circuit diagram of a control device for an air cleaner according to an embodiment of the second problem solving means of the present invention, and FIG. 6 is a block circuit diagram of a control device for a conventional air cleaner. 6...Gas sensor, 7...Detection means,
8... Integration counter, 9... Correction means, 10... Storage means, 11... Comparison means, 12... Control means. Name of agent: Patent attorney Haruaki Koebi and two others 11! 6, ri

Claims (2)

[Claims] (1) A gas sensor that detects air pollution, a detection means that detects the output level of this gas sensor, an integration counter that detects the degree of dirt on a filter that removes air pollution, and the output from this integration counter and detection means. a correction means for correcting the degree of gas contamination by inputting a signal from the gas contamination; a storage means for storing a resistance value serving as a reference for gas contamination; and a signal output from the storage means and the correction means. A control device for an air purifier comprising a comparison means for determining the degree of air pollution, and a control means for changing the output based on a signal output from the comparison means. (2) Control of the air purifier according to claim 1, wherein a main body counter is provided to detect the degree of contamination of the main body of the air purifier, and a signal detected by the main body counter is inputted to a correction means to correct the degree of contamination of the gas. Device.