KR20160149890A - Alarm Device for the Filter Replacement Time of Air Cleaner, Decision Method and Air Cleaner Operated Thereby - Google Patents

Abstract

Disclosed are a device for providing notification of replacement time of a filter for an air purifier, a method for determining replacement time of a filter for an air purifier, and an air purifier operated by the same. A device (100) for providing notification of replacement time of a filter for an air purifier according to an embodiment of the present invention, which is mounted in the air purifier, determines replacement time of the filter for the air purifier by means of an optical measurement device, and notifies a user of arrival of the replacement time of the filter, comprises: an optical measurement device (110) which is disposed adjacent to a filter (10), measures transmitted light intensity of the filter (10) in real time, and transmits data on the measured transmitted light intensity to a control unit (120); and the control unit (120) which calculates a value of a difference in transmitted light intensity of the filter in real time based on data on transmitted light intensity initially measured from an uncontaminated filter and the data on the transmitted light intensity received from the optical measurement device (120), and provides a notice to a user when the value of the difference in the transmitted light intensity exceeds a preset value. In accordance with the device for providing notification of replacement time of a filter for an air purifier according to the present invention, replacement time of the filter for the air purifier can be accurately determined based on the preset value by means of the optical measurement device, and thus waste of a filter attributable to replacement of an uncontaminated filter can be prevented and also a filter can be replaced at appropriate time, thereby maximizing efficiency of an air purifier.

Description

Technical Field [0001] The present invention relates to an air purifier, and more particularly, to an alarm device for air cleaner,

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to an air cleaner filter replacement timing notification device, a determination method, and an air cleaner operated by the filter cleaner. More particularly, And an air cleaner operated therethrough.

The filter for air cleaning according to the prior art is set at a replacement period according to a recommended standard suggested by the manufacturer, and is replaced when the time comes.

The filter replacement method according to the related art changes the filter irrespective of whether the actual filter is contaminated. Therefore, when the filter is not sufficiently contaminated, the filter is wasted. When the filter is seriously contaminated, The performance of the air cleaning apparatus can be hindered.

In order to solve such a problem, in the prior art, a gravimetric method, a differential pressure check method, and the like are used to predict a filter replacement period.

Specifically, in the case of the gravimetric method, it is used in a large pre-filter in that the weight of the filter before and after the contamination must be checked.

FIG. 1 is a block diagram illustrating a method for determining a replacement time of a filter for an air purifier according to the related art.

Referring to FIG. 1, the configuration of a filter for an air cleaner to which the above-described differential pressure checking method is applied can be confirmed.

As shown in FIG. 1, in the differential pressure check method according to the related art, the pressure difference generated by the filter is calculated by using a pressure measuring device provided on one side of the filter and a pressure measuring device provided on the other side of the filter , And when the pressure difference exceeds a predetermined value, the filter is replaced.

The differential pressure verification method is hard to access because most of the filters are enclosed in the equipment, and it is very difficult to confirm in the air conditioner equipment used in multiple facilities.

Therefore, there is a need for a technique capable of solving the problem of the filter replacement timing determination method according to the above-described prior art.

Korean Published Patent Application No. 10-2012-0090375 (published on August 17, 2012)

It is an object of the present invention to provide a filter replacement timing notification device for an air cleaner which can appropriately determine a filter replacement timing when an air cleaner is used so as to prevent waste of a filter and induce efficient use of the air cleaner, And to provide an air purifier operated through the method.

In order to achieve the above object, according to an aspect of the present invention, there is provided an apparatus for notifying the replacement time of a filter for an air cleaner, the apparatus being mounted on the air cleaner, judging the replacement time of the filter for the air cleaner using an optical measuring device, An optical measuring device mounted adjacent to the filter for measuring the light transmittance of the filter in real time and transmitting the measured light transmittance data to the control unit; And the light transmittance of the filter is calculated in real time on the basis of the light transmittance of light measured initially from the filter in the uncontaminated state and the light transmittance of the light received from the optical measuring device, And a control unit for notifying the user of the abnormality when it is exceeded.

In this case, the optical measuring apparatus may further include: a light irradiation device mounted adjacent to one side surface of the filter, for irradiating light toward the filter; And a light receiving device mounted on the other side surface of the filter to recognize the light transmitted through the filter and transmit measured light transmittance data to the control unit.

A filter replacement timing notification device for an air cleaner according to another aspect of the present invention includes: an air cleaner filter installed in an air cleaner, judging a replacement time of a filter for an air cleaner by using an optical measuring device, A replacement timing notification device, comprising: an optical measuring device mounted adjacent to a filter, for photographing a filter while irradiating the filter with monochromatic light, and for transmitting the photographed data to the control part; And calculates the number of black dots of the filter in real time on the basis of the data originally photographed obtained from the filter in the uncontaminated state and the data received from the optical measuring device, The control unit informs the user of the abnormality.

At this time, the monochromatic light irradiated to the filter from the optical measuring device may be blue light.

The optical measuring apparatus may further include: a light irradiation device mounted adjacent to one side surface of the filter and irradiating monochromatic light toward the filter; And a photographing apparatus mounted adjacent to one side face of the filter and photographing a filter irradiated with monochromatic light and then transmitting the photographed data to the control unit.

In one embodiment of the present invention, the filter replacement timing notification device for the air cleaner may further include: a wireless communication module for transmitting a notification signal generated from the control unit to the portable wireless communication device of the user.

According to an aspect of the present invention, there is provided a method for determining a filter replacement timing using a filter replacement timing notification device for an air cleaner, the method comprising: a) An initial measurement step of measuring transmitted light intensity; b) measuring a light transmittance of the filter mounted on the air cleaner, the light being irradiated to one side of the filter and measuring the luminous intensity of the light projected from the other side of the filter; c) calculating a light transmission light intensity difference value that real-time calculates the difference between the light transmission light intensity obtained from the initial measurement step and the real-time light transmission light intensity value obtained from the light transmission light intensity measurement step; And d) a step of notifying the user of the change of the light transmission intensity difference value when the value exceeds the predetermined value.

According to another aspect of the present invention, there is provided a method for determining a filter replacement timing using a filter replacement timing notification device for an air cleaner, comprising the steps of: a) irradiating monochromatic light onto one side of a filter in a non- A non-contaminated filter photographing step of photographing a filter in a state of acquiring photographing data and calculating the number of black dots; b) a contamination filter photographing step of photographing a filter in a state in which monochromatic light is irradiated to one side of a filter mounted on the air cleaner to obtain photographing data and then calculating the number of black dots; c) calculating a difference value of the number of black dots obtained from the contamination filter photographing step and the non-contaminated filter photographing step; And d) when the difference value of the number of black dots exceeds a predetermined value, notifying the user of the replacement time.

In one embodiment of the present invention, the non-contaminated filter photographing step and the contaminated filter photographing step may include: i) a step of irradiating monochromatic light onto one side of the filter; ii) a photographing step of photographing one side of a filter irradiated with monochromatic light to obtain photographing data; iii) a shooting data conversion step of obtaining the brightness value of each pixel after changing the acquired shooting data to a gray scale state; And iv) a black dot calculation step of calculating the number of black dots based on each pixel brightness value obtained from the shooting data conversion step.

In addition, the present invention can provide an air purifier including a filter replacement timing notification device for the air cleaner.

As described above, according to the filter replacement timing notification device for an air cleaner of the present invention, it is possible to accurately determine the replacement time of the filter for the air cleaner by using the optical measuring device, It is possible to prevent the filter from being wasted by replacing the filter, and to replace the filter at an appropriate time, thereby maximizing the efficiency of the air cleaner and using the air cleaner.

In addition, according to the air cleaner filter replacement timing notification device of the present invention, by using a simple optical measuring device in comparison with a notification device using a pneumatic difference and a notification device using weight measurement, It can be easily applied to air purifiers.

In addition, according to the air cleaner filter replacement timing notification device of the present invention, since the wireless communication module that can transmit the notification signal generated from the control unit to the user's portable wireless communication device is provided, it is possible to more effectively maintain and manage the air cleaner have.

In addition, according to the method of determining the filter replacement timing using the filter replacement timing notification device for an air cleaner of the present invention, it is possible to accurately determine the replacement timing of the filter for the air cleaner by using the optical measurement device It is possible to prevent the filter from being wasted by replacing the uncontaminated filter and to replace the filter at an appropriate time. As a result, the efficiency of the air cleaner can be maximized and the air cleaner can be used.

FIG. 1 is a block diagram showing a method for determining a replacement time of a filter for an air cleaner according to the related art.
2 is a schematic diagram showing an apparatus for notifying the replacement time of a filter for an air cleaner according to an embodiment of the present invention.
FIG. 3 is a flowchart illustrating a method of determining a filter replacement timing using the filter replacement timing notification device for an air cleaner shown in FIG. 2;
FIG. 4 is a schematic diagram showing a filter replacement timing notification device for an air cleaner according to another embodiment of the present invention.
FIG. 5 is a flowchart illustrating a method for determining a filter replacement timing using the filter replacement timing notification device for the air cleaner shown in FIG.
FIG. 6 is a flowchart illustrating a detailed process of a non-contaminated filter photographing step and a contaminated filter photographing step in the filter replacement timing determining method shown in FIG.
Fig. 7 is a photograph showing the photographing data (left) photographed with the monochromatic light on one side of the non-contaminated filter and the data obtained by converting the photographing data (right).
Fig. 8 is a photograph showing the photographing data (left) photographed with the filter irradiated with monochromatic light on one side of the contamination filter and the data obtained by converting the photographing data (right).
9 is a graph showing a change in light absorption rate according to the differential pressure ratio.
10 is a graph showing a change in black dot pixel percentage value according to the differential pressure ratio.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the drawings. Prior to the description, terms and words used in the present specification and claims should not be construed as limited to ordinary or dictionary meanings and should be construed in accordance with the technical concept of the present invention.

Throughout this specification, when a member is "on " another member, it includes the case where there is another member between the two members as well as when the member is in contact with the other member.

Throughout this specification, when an element is referred to as "including" an element, it is understood that it may include other elements as well, without departing from the other elements unless specifically stated otherwise.

FIG. 2 is a schematic diagram illustrating a filter replacement timing notification device for an air cleaner according to an embodiment of the present invention. FIG. 3 illustrates a filter replacement timing notification device for the air cleaner shown in FIG. A flowchart showing a method of judging is shown.

Referring to these drawings, the filter replacement timing notification device 100 for an air cleaner according to the present embodiment is installed in an air cleaner, and judges the replacement timing of the filter for the air cleaner by using an optical measuring device, Is a device.

Specifically, the filter replacement timing notification device 100 for an air cleaner according to the present embodiment may be configured to include the optical measuring device 110 and the control unit 120. [

2, the optical measuring apparatus 110 is mounted adjacent to the filter 10, measures the light transmittance of the filter 10 in real time, and transmits the measured light transmittance light data to the controller 120 ). More specifically, the optical measuring device 110 may be configured to include a light irradiating device 111 and a light receiving device 112. At this time, the light irradiation device 111 is mounted adjacent to one side surface of the filter 10, and can irradiate light toward the filter 10. The photoreflecting device 112 is attached to the other side surface of the filter 10 and measures the luminous intensity of the light transmitted through the filter 10 and transmits the measured light transmittance data to the controller 120 .

On the other hand, the control unit 120 calculates the light transmission light intensity difference value of the filter in real time on the basis of the light transmission light measured first from the uncontaminated filter and the light transmission light intensity data received from the optical measuring apparatus 120, If the difference of light transmission light intensity value exceeds a predetermined value, it can inform the user.

The filter replacement timing notification device 200 for an air cleaner according to the present embodiment further includes a wireless communication module 230 for transmitting a notification signal generated from the control unit 220 to a user's portable wireless communication device Lt; / RTI >

In this case, the air purifier can be more effectively maintained and managed by providing the wireless communication module capable of transmitting the notification signal generated from the control unit to the portable wireless communication apparatus of the user.

Hereinafter, a method (S100) for determining the filter replacement timing using the filter replacement timing notification device 100 for the air cleaner will be described in detail.

The method for determining a replacement time of an air cleaner for an air cleaner according to the present invention includes the steps of: measuring an initial measurement step (S110), measuring a light transmission light intensity (S120), calculating a light transmission lightness difference value (S130) S140).

Specifically, the initial measurement step (S110) is a step of measuring light transmittance of the filter in an uncontaminated state.

The step of measuring light transmittance light (S120) is a step of irradiating light to one side of the filter 10 mounted on the air purifier and measuring the light intensity of the light projected from the other side of the filter 10.

The light transmittance difference value calculating step S130 is a step of calculating the difference between the light transmittance light obtained from the initial measurement step S110 and the real time light transmittance light value obtained from the light transmittance measurement step S120 in real time.

In addition, the replacement timing notification step (S140) is a step of notifying the user of the difference in light transmission light intensity value when the difference exceeds a predetermined value.

The filter replacement timing notification device 100 for an air cleaner can be effectively operated by the above-described filter replacement timing determination method (S100) for the air cleaner.

As a result, according to the filter replacement timing notification device for an air cleaner of the present invention, it is possible to accurately determine the replacement time of the filter for the air cleaner by using the optical measuring device and to replace the uncontaminated filter The filter can be prevented from being wasted and the filter can be replaced at an appropriate time. As a result, the efficiency of the air cleaner can be maximized and the air cleaner can be used.

In addition, according to the air cleaner filter replacement timing notification device of the present invention, by using a simple optical measuring device in comparison with a notification device using a pneumatic difference and a notification device using weight measurement, It can be easily applied to air purifiers.

FIG. 4 is a schematic diagram illustrating a filter replacement timing notification device for an air cleaner according to another embodiment of the present invention. FIG. 5 shows a filter replacement timing notification device for an air cleaner, Is shown in the flow chart. FIG. 6 is a flowchart showing the detailed steps of the non-contaminated filter photographing step and the contaminated filter photographing step in the filter replacement timing determining method shown in FIG.

Referring to these drawings, the filter replacement timing notification device 200 for an air cleaner according to the present embodiment may be configured to include the optical measuring device 210 and the control unit 220.

Specifically, the optical measuring device 210 is mounted adjacent to the filter 10, and can photograph the filter 10 while irradiating the filter 10 with monochromatic light and transmit the photographed data to the control unit 220 .

More specifically, the optical measuring device 200 may be a configuration including the light irradiating device 211 and the photographing device 212. The light irradiating device 211 is mounted adjacent to one side surface of the filter 10 and can irradiate monochromatic light toward the filter 10. [ The photographing apparatus 212 is installed adjacent to one side face of the filter 10 and can photograph the filter 10 irradiated with monochromatic light and then transmit the photographed data to the control unit 220. [

On the other hand, the control unit 220 calculates the number of black dots of the filter in real time based on the initially photographed data obtained from the uncontaminated filter and the data received from the optical measuring apparatus 210 If the number of black dots exceeds a preset value, the user can be informed of the number of black dots.

The light emitted from the light irradiation device 211 of the optical measuring apparatus 200 may not necessarily be monochromatic light. When the filter 10 is photographed and converted into image data, the obtained image data has a specific number of pixels in accordance with the resolution of the photographing apparatus 212. At this time, each pixel has its own color, and the lightness and darkness of the color are digitized, and data can be converted into white when it is brighter than black or black when it is dark based on a specific numerical value. After this process, the percentage of black pixels among all the pixels can be calculated to measure the filter pollution degree.

Therefore, the filter replacement timing notification device 200 for an air cleaner according to the present embodiment including such a configuration can accurately determine the replacement timing of the filter for the air cleaner by using the optical measuring device, It is possible to prevent the filter from being wasted by replacing the uncontaminated filter and to replace the filter at an appropriate time, thereby maximizing the efficiency of the air cleaner and using the air cleaner.

Hereinafter, a method (S200) for determining the filter replacement timing using the above-described filter replacement timing notification device 200 for the air cleaner will be described in detail.

The method for determining a filter replacement time for an air cleaner according to the present embodiment S200 includes the steps of photographing a non-contaminated filter S210, photographing a contaminated filter S220, calculating a difference value S230, . ≪ / RTI >

Specifically, in the non-contaminated filter photographing step S210, the filter is photographed in a state in which the monochromatic light is irradiated to one side of the filter in the uncontaminated state. After obtaining the photograph data, the number of black dots .

In the contamination filter photographing step S220, a filter is photographed in a state in which monochromatic light is irradiated to one side of the filter mounted on the air cleaner. After the photograph data is acquired, the number of black dots is calculated .

The above-described non-contaminated filter photographing step S210 and the contamination filter photographing step S220 will be described in detail with reference to FIGS. 7 to 8. FIG.

Fig. 7 shows a photograph showing the photographing data (left) photographed with the monochromatic light on one side of the non-contaminated filter and the data obtained by converting the photographing data (right) There is shown a photograph showing a state of photographing data (left) in which a filter is photographed while monochromatic light is irradiated on one side and data (right) in which photographing data is converted.

The non-contaminated filter photographing step S210 and the contamination filter photographing step S220 include a monochromatic light irradiating step S1, a photographing step S2, a photographing data converting step S3 and a black dot calculating step S4 Lt; / RTI >

Specifically, the monochromatic light irradiation step S1 is a step of irradiating monochromatic light to one side of the filter. The photographing step S2 is a step of photographing one side of a filter irradiated with monochromatic light to acquire photographing data. The shooting data conversion step (S3) is a step of obtaining the brightness value of each pixel after changing the obtained shooting data into a gray scale state. The black dot calculation step S4 is a step of calculating the number of black dots based on each pixel brightness value obtained from the photographic data conversion step.

The above-mentioned gray scale state refers to a state of being imaged so that the contrast of a photographic image can be seen.

Next, the difference value calculating step (S230) is a step of calculating the difference value of the number of black dots obtained from the contamination filter photographing step (S220) and the non-contaminated filter photographing step (S210).

In step S240, when the difference value of the number of black dots exceeds a predetermined value, the step of informing the replacement time is notified to the user.

As described above, according to the method for determining the filter replacement timing using the filter replacement timing notification device for an air cleaner of the present invention, the replacement timing of the filter for the air cleaner can be precisely It is possible to prevent waste of the filter caused by replacing the uncontaminated filter and to replace the filter at an appropriate time. As a result, the efficiency of the air cleaner can be maximized and the air cleaner can be used .

9 is a graph showing a change in light absorption rate according to the differential pressure ratio.

As can be seen from FIG. 9, it can be seen that the light absorption rate increases as the differential pressure ratio increases.

In other words, as the degree of contamination of the filter increases, the differential pressure ratio between both sides of the filter increases, and as the differential pressure ratio increases, the light absorption rate of the filter increases.

At this time, the light absorption rate was calculated by the following equation (1).

<Formula 1>

As a result, it can be seen that the light absorption rate of the filter increases as the pollution degree of the filter increases, and the pollution degree of the filter can be measured by measuring the light absorption rate of the filter.

FIG. 10 is a graph showing the change of the black dot pixel percentage value according to the differential pressure ratio.

As can be seen from FIG. 10, it can be seen that as the differential pressure ratio increases, the black dot pixel percentage value increases.

In other words, as the contamination degree of the filter increases, the differential pressure ratio on both sides of the filter increases, and as the differential pressure ratio increases, the black dot pixel percentage value of the filter increases.

At this time, the black dot pixel percentage calculation was performed using the following equation (2).

<Formula 2>

As a result, it can be seen that the black dot pixel percentage value of the filter increases as the pollution degree of the filter increases, and the pollution degree of the filter can be measured by measuring the black dot pixel percentage value of the filter.

As described above, the above-mentioned method (S100, S200) for determining the filter replacement time for the air cleaner can confirm the contamination state of the filter in real time. In addition, the filter replacement timing notification device for the air purifier mentioned above is very simple in configuration, and can be easily applied to pre-filter and HEPA-filter.

In the above description of the present invention, only specific embodiments thereof are described. It is to be understood, however, that the invention is not to be limited to the specific forms thereof, which are to be considered as being limited to the specific embodiments, but on the contrary, the intention is to cover all modifications, equivalents, and alternatives falling within the spirit and scope of the invention as defined by the appended claims. .

That is, the present invention is not limited to the above-described specific embodiment and description, and various changes and modifications may be made without departing from the spirit and scope of the invention as defined in the appended claims. And such variations are within the scope of protection of the present invention.

10: Filter
20: air flow path
21: Air inlet
22: Air outlet
100: Notify when to replace filter for air cleaner
110: Optical measuring device
111: light irradiation device
112: Optical fiber channel
120:
130: Wireless communication module
200: Notify when to replace filter for air cleaner
210: Optical measuring device
211: light irradiation device
212: photographing apparatus
220:
230: Wireless communication module
S100: How to decide when to replace filter for air cleaner
S110: Initial measurement step
S120: Light transmittance measurement step
S130: Light transmission light intensity difference value calculation step
S140: Notify when to replace
S200: How to decide when to replace filter for air cleaner
S210: Uncoloured filter shooting step
S220: Pollution filter photographing step
S230: Difference value calculation step
S240: Notify when to replace
S1: Monochromatic light irradiation step
S2: photographing step
S3: shooting data conversion step
S4: Black dot calculation step

Claims (10)

A filter replacement timing notification device (100) for an air cleaner, which is attached to an air cleaner, determines the replacement timing of the filter for the air cleaner by using an optical measuring device,
An optical measuring device 110 mounted adjacent to the filter 10 for measuring the light transmittance of the filter 10 in real time and transmitting the measured light transmittance data to the controller 120; And
Based on the light transmittance of light initially measured from the uncontaminated filter and the light transmittance data received from the optical measuring device 120, the difference value of the light transmittance of the filter is calculated in real time, A control unit (120) for informing the user if the value is exceeded;
Wherein the filter replacement timing notification device for the air cleaner includes:
The method according to claim 1,
The optical measuring apparatus 110 comprises:
A light irradiating device (111) mounted adjacent to one side surface of the filter (10) and irradiating light toward the filter (10); And
A photodetection device 112 mounted on the other side surface of the filter 10 for recognizing and measuring the luminous intensity of the light transmitted through the filter 10 and transmitting the measured light transmission intensity data to the control part 120;
Wherein the filter replacement timing notification device for the air cleaner includes:
A filter replacement timing notification device (200) for an air cleaner mounted on an air cleaner, for judging a replacement timing of an air cleaner filter using an optical measuring device,
An optical measuring device 210 mounted adjacent to the filter 10 to photograph the filter 10 in a state in which monochromatic light is irradiated to the filter 10 and transmit the photographed data to the control unit 220; And
The number of black dots of the filter is calculated in real time on the basis of the initially photographed data obtained from the uncontaminated filter and the data received from the optical measuring device 210, A control unit (220) for informing the user when the set value is exceeded;
Wherein the filter replacement timing notification device for the air cleaner includes:
The method of claim 3,
Wherein the monochromatic light irradiated from the optical measuring device (210) to the filter (10) is blue light.
The method of claim 3,
The optical measuring apparatus 200 comprises:
A light irradiation device 211 mounted adjacent to one side surface of the filter 10 and irradiating monochromatic light toward the filter 10; And
A photographing apparatus 212 mounted adjacent to one side surface of the filter 10 for photographing the filter 10 irradiated with monochromatic light and then transmitting photographed data to the control unit 220;
Wherein the filter replacement timing notification device for the air cleaner includes:
The method according to claim 1 or 3,
The filter replacement timing notification device 200 for the air cleaner includes:
And a wireless communication module (230) for transmitting the notification signal generated from the controller (220) to the portable wireless communication device of the user.
A method (S100) for determining a filter replacement timing using a filter replacement timing notification device (100) for an air cleaner according to any one of claims 1 to 2,
a) an initial measurement step (S110) of measuring the light transmittance of the filter in an uncontaminated state;
b) measuring a light transmittance (S120) of irradiating light to one side of the filter (10) mounted on the air cleaner and measuring the luminous intensity of the light projected from the other side of the filter (10);
c) a light transmission light intensity difference value calculation step (S130) of calculating, in real time, the light transmission light obtained from the initial measurement step (S110) and the difference value of the real time light transmission light intensity value obtained from the light transmission light intensity measurement step (S120); And
d) a replacement timing notification step (S140) of informing the user of the difference of the light transmission light intensity values when the difference value exceeds a predetermined value;
Wherein the air purifier has a filter replacement time period.
A method (S200) for determining a filter replacement timing using a filter replacement timing notification device (200) for an air cleaner according to any one of claims 3 to 5,
a) a non-contaminated filter photographing step (S210) of photographing a filter in a state in which monochromatic light is irradiated to one side of the filter in an uncontaminated state to obtain photograph data and then calculating the number of black dots;
b) a contamination filter photographing step (S220) of photographing a filter in a state where monochromatic light is irradiated to one side of the filter mounted on the air cleaner to obtain photographic data, and then calculating the number of black dots;
c) a difference value calculating step (S230) of calculating a difference value of the number of black dots obtained from the contamination filter photographing step (S220) and the non-contaminated filter photographing step (S210); And
d) a replacement timing notification step (S240) for notifying a user of the difference value of the number of black dots when the difference value exceeds a predetermined value;
Wherein the air purifier has a filter replacement time period.
9. The method of claim 8,
The non-contaminated filter photographing step (S210) and the contamination filter photographing step (S220)
i) a monochromatic light irradiation step (S1) of irradiating monochromatic light to one side of the filter;
ii) a photographing step S2 of photographing one side of the filter irradiated with the monochromatic light to obtain photographing data;
iii) a shooting data conversion step (S3) of changing the acquired shooting data to a gray scale state and obtaining a brightness value of each pixel; And
iv) a black dot calculation step (S4) of calculating the number of black dots based on each pixel brightness value obtained from the photographic data conversion step;
Wherein the air purifier has a filter replacement time period.
The air purifier according to any one of claims 1 to 6, further comprising a filter replacement timing notification device (100, 200) for an air cleaner.

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