KR20150089976A - Cleaner with a filter status notification function - Google Patents

Abstract

Disclosed is a cleaner with a filter status notification function. The present invention has a notification function to allow a user to recognize a status of a filter applied to the cleaner after checking the filter status; decelerates a driving speed of a motor after detecting a cleaning pressure in accordance to the variation of the filter status; prevents a performance degradation of the cleaner due to blockage of the filter by quickly notifying a replacement of the filter to a user; and improves product satisfaction while minimizing noise in the use of the cleaner by constantly maintaining a suction force of the cleaner in accordance to the blocked degree of the filter. The cleaner with a filter status notification function comprises: a main body, a dust tank, a motor, a motor control part, and a first filter. According to the present invention, the cleaner with a filter status notification function additionally comprises: a first detection part; a control part for a motor control part; and a display part.

Description

[0001] The present invention relates to a cleaner with a filter status notification function,

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to a vacuum cleaner, and more particularly, to a vacuum cleaner in which dust is sucked from a suction force of a cleaner motor by a filter, The present invention also relates to a vacuum cleaner having a filter status notification function for detecting a cleaning pressure corresponding to a change in the state of a checked filter to keep the suction power of the vacuum cleaner at a constant level while increasing or decreasing a driving speed of the motor.

Generally, bedding such as pillow and pillow and bed mattress, as well as floor carpet, etc., come into contact with the human body for a relatively long time.

Therefore, bedding or carpets (hereinafter referred to as "objects to be cleaned") may be contaminated with dust, body dust, and the like of house dust mites that live on the keratin materials that are dropped from the human body, In particular, sweat from the human body, in particular, has been found, creating an environment in which bacteria, house dust mites, etc., are harmful to human body.

On the other hand, the foreign matter contaminated with the object to be cleaned can be a prey of bacteria and pests, and the object to be cleaned itself can be a habitat of bacteria and pests, thus causing a problem that the user of the object to be cleaned is damaged by bacteria and pests .

For this reason, the object to be cleaned is shaved from time to time and sunlight, disinfectant and insecticide are sprayed and disinfected with some medicines.

However, since bacteria and pests are not only small in size but also are parasitic and act as habitats for deeply cleaning objects as well as on the surface of the object to be cleaned, they can be cleaned by shaking the object to be cleaned, spraying a disinfectant or insecticide with some medicines, There is a problem that the removal of the catalyst layer is insufficient.

To solve the above problems, the applicant of the present invention has come to disclose a vacuum cleaner such as the registered patent publication No. 10-0661619 (published on Dec. 26, 2006), and the registered patent publication No. 10-1302673 (publication date: 2013.09.03).

The cleaner includes a main body, a suction motor, a brush, a striking body, an ultraviolet lamp, a filter, and the like. When the foreign object on the surface of the object to be cleaned is sucked through operation of the motor, the brush sweeps down the surface of the object, So that foreign substances can be easily removed from the object to be cleaned and the surface of the object to be cleaned can be sterilized by ultraviolet irradiation from the ultraviolet lamp.

At this time, the filter applied to the vacuum cleaner may include a primary filter installed close to the dust container to remove dust of a predetermined size, and / or a dust filter installed close to the motor to remove fine dust not removed by the primary filter, A secondary filter that prevents fine dust from being discharged to the outside is applied.

However, the primary filter and / or the secondary filter applied to the prior arts filed and registered by the applicant of the present invention as well as the conventionally known cleaners need to frequently check and remove the dust adhered to the surface of the filter by the user, If the dust is not properly removed from the surface of the filter and the clogging phenomenon occurs in the filter, even if the output efficiency of the cleaner motor is high, the suction force of the filter is inevitably lowered. As a result, I had a structural problem that I could not do.

In addition, in the prior arts filed and registered by the present applicant as well as conventionally known cleaners, the function of maintaining the output efficiency of the cleaner motor is not implemented even if the filter is clogged by dust, There is a disadvantage that it causes inconvenience to the consumer and it is inconvenient to directly check whether the filter is clogged and to replace the filter because the function of adjusting the driving force of the motor to the operation mode of the strong, medium or weak is provided.

SUMMARY OF THE INVENTION Accordingly, the present invention has been made to solve the above-mentioned problems occurring in the prior art, and it is an object of the present invention to provide a notification function that enables a user to recognize a state of a filter applied to a cleaner, The present invention has been made in view of the above problems, and it is an object of the present invention to provide a vacuum cleaner having a filter status notification function that can prevent deterioration of the performance of the vacuum cleaner due to filter clogging.

It is another object of the present invention to provide a vacuum cleaner which is configured such that the driving force of the motor is increased or decreased after detecting the cleaning pressure according to the state of the checked filter, To minimize noise generation.

According to an aspect of the present invention, there is provided a vacuum cleaner having a filter status notification function, the vacuum cleaner comprising: a main body having a suction port; A dust container coupled to one end of the main body; A motor formed inside the main body and driven to suck dust through the suction port; A motor control unit for controlling an output efficiency of the motor; A first filter installed adjacently to the dust container and filtering the dust contained in the foreign substance to the outside of the dust container when foreign substances are introduced into the dust container through the suction port as the motor is driven; A first sensing unit installed between the dust container and the motor and measuring a wind pressure passing through the first filter; And a control unit for controlling the motor so as to increase or decrease the driving speed of the motor in accordance with the determined amount of dust adhered to the first filter, A control unit for controlling the control unit; A display unit formed on one side of the main body and displaying a dust adhering amount determined by the control unit so as to determine whether or not to exchange with the first filter; As shown in FIG.

The first sensing unit is an analog type pressure sensor that outputs a first measured value of a voltage with respect to a wind pressure passing through the first filter to the control unit.

Also, the first measured value of the voltage measured by the first sensing unit is amplified by the first amplifying unit, converted into a digital signal, and output to the control unit.

The first sensing unit is a digital pressure sensor that outputs a second measured value of the pressure ratio to the wind pressure passing through the first filter to the control unit through a digital communication method.

The control unit may further include a reference table storing a first pressure value matching the first measured value of the voltage, and the controller may be configured such that the first measured value of the voltage amplified by the first amplifying unit is input A determination program for searching the reference table for a first pressure value matching a first measured value of the voltage, determining a dust adhesion amount of the first filter from the first pressure value searched, and displaying the determination result on the display unit It will be mounted.

The control unit may further include a reference table storing a second pressure value matching the second measured value of the pressure ratio, wherein the controller determines that the second measured value of the pressure ratio output from the pressure sensor of the digital type is A second pressure value matching the second measured value of the input pressure ratio is searched from the reference table, a dust adhesion amount of the first filter is determined from the searched second pressure value, and the determination result is displayed on the display unit And a judgment program is mounted.

An airflow is formed on the rear side of the main body, and fine dust that is not filtered by the first filter is filtered on the inside of the airflow to prevent the fine dust from being discharged to the outside of the main body through the airflow A second filter; A second sensing unit disposed between the motor and the air flow sensor for measuring a wind pressure passing through the second filter and outputting the measured wind pressure to the control unit; .

The second sensing unit is an analog type pressure sensor that outputs a first measured value of a voltage with respect to a wind pressure passing through the second filter to the control unit.

Also, the first measured value of the voltage measured by the second sensing unit is amplified by the second amplifying unit, converted into a digital signal, and output to the control unit.

The second sensing unit is a digital pressure sensor that outputs a second measured value of a pressure ratio to the wind pressure passing through the second filter to the control unit through a digital communication method.

The control unit may include a reference table storing a first pressure value matching the first measured value of the voltage, and the controller may be configured such that the first measured value of the voltage amplified by the second amplifying unit is input Searching the reference table for a first pressure value matching a first measured value of the voltage, determining a dust adhesion amount of the second filter from the detected first pressure value, and displaying a determination result on the display unit It will be mounted.

Further, the control unit may have a reference table storing a second pressure value matching the second measured value of the pressure ratio, and the controller may determine that the second measured value of the pressure ratio output from the pressure sensor of the digital type is & A second pressure value matching the second measured value of the input pressure ratio is searched from the reference table, a dust adhesion amount of the second filter is determined from the searched second pressure value, and the determination result is displayed on the display unit And a judgment program is mounted.

In addition, the display unit is configured to display a first indicator that indicates a state of the first filter or the second filter, that is, a warning or an exchange, which is a normal or pre-exchange step, according to a control operation of the control unit.

The display unit is configured to display a second indicator that displays a state of the first filter or the second filter in a normal state or a pre-exchange step of a warning or exchange in a graphic form according to a control operation of the control unit.

As described above, the present invention constitutes a notification function that enables the user to recognize the state of the filter applied to the cleaner, and also detects the cleaning pressure according to the state change of the checked filter, This allows the user to quickly identify whether or not the filter is exchanged, thereby preventing the deterioration of the performance of the vacuum cleaner due to clogging of the filter and maintaining the suction power of the vacuum cleaner constantly according to the degree of clogging of the filter. It is possible to expect the effect of improving the product satisfaction while minimizing the noise generation.

1 is a perspective view showing the structure of a vacuum cleaner according to an embodiment of the present invention.
2 is a schematic cross-sectional view showing the structure of a vacuum cleaner according to an embodiment of the present invention.
FIG. 3 is a schematic block diagram illustrating a filter state notification function of a cleaner according to an embodiment of the present invention; FIG.
4 is a schematic plan view of a display unit on which an indicator is displayed for informing a user of dust amount of a filter according to an embodiment of the present invention.
5 is a schematic circuit diagram of an analog type pressure sensor according to an embodiment of the present invention.
6 is a schematic circuit diagram of a digital pressure sensor according to an embodiment of the present invention.
7 is a view showing a pressure table in a control unit storing a pressure value matched with a measured voltage value according to an embodiment of the present invention.
8 is a diagram showing a pressure table in a control section storing a digital output value of a pressure matched to a pressure ratio in an embodiment of the present invention.
9 is a view showing a control table of a control unit showing a state in which a suction pressure of a vacuum cleaner is kept constant through an output efficiency control of a motor according to a measured pressure ratio of a filter according to an embodiment of the present invention.

Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings.

FIG. 1 is a perspective view showing a structure of a vacuum cleaner according to an embodiment of the present invention. FIG. 2 is a schematic cross-sectional view showing the structure of a vacuum cleaner according to an embodiment of the present invention. As shown in FIG.

5 is a schematic circuit diagram of an analog pressure sensor according to an embodiment of the present invention. FIG. 6 is a schematic circuit diagram of an analog pressure sensor according to an embodiment of the present invention. Shows a schematic circuit diagram of a digital pressure sensor as an embodiment of the present invention.

1 to 6, a vacuum cleaner having a filter status notification function according to an embodiment of the present invention includes a main body 1 having a suction port 1a, a dust receptacle (not shown) coupled to one end of the main body 1, A motor 3 formed inside the main body 1 and driven to suck dust through the suction port 1a; a motor control unit 4 for controlling the output efficiency of the motor 3; And dust particles contained in the dust container 2 when the dust container 2 is introduced into the dust container 2 through the suction port 1a according to the driving of the motor 3 is provided adjacent to the dust container 2, And a first filter 5 for filtering the second filter 5 so as not to be discharged to the outside. The first filter 5 further includes a first sensing unit 10, a control unit 20, and a display unit 30.

The first sensing unit 10 is installed between the dust container 2 and the motor 3 and measures the wind pressure (wind pressure) passing through the first filter 5 and measures the wind pressure And outputs the first measured value of the voltage to the control unit 20.

Here, the first sensing unit 10 converts a first measured value of voltage for wind pressure measurement passing through the first filter 5 from an analog to a digital signal (ADC) and outputs it to the control unit 20 Or a first measured value of the pressure ratio with respect to wind pressure passing through the first filter 5, as shown in FIG. 6, to the control unit 20 in a digital communication manner And a digital pressure sensor.

That is, when the first sensing unit 10 is constituted by an analog pressure sensor, the pressure sensor of the analog type is connected to the first amplifying unit 50, which is an operational amplifier (OP-AMP) The first measured value of the voltage is amplified and then converted into a digital signal and outputted to the controller 20. [

Here, when the first sensing unit 10 is constituted by an analog pressure sensor, the pressure sensor detects the pressure of the first sensor 5 at a first voltage (for example, 0 to several tens of microvolts) And the first measured value of the output voltage is set to a voltage within a certain range (for example, 0 to 5 V range) so that the controller 20 can read the first measured value through the first amplifier 50 Amplified and then converted into a digital signal and output to the controller 20.

When the first sensing unit 10 is constituted by a digital pressure sensor, the first amplifying unit 50 may not be used. This is because the digital pressure sensor is connected to the control unit 20 and the I2C Inter-Integrated Circuit) or SPI (Serial Peripheral Interface) type digital communication method and outputs the second measured value of the pressure ratio to the measured wind pressure directly to the controller 20.

The control unit 20 is electrically connected to the first sensing unit 10 and is formed in a control board (not shown) in the main body 1. The control unit 20 senses the wind pressure measured by the first sensing unit 10 The second measured value of the voltage or pressure ratio is matched with the second pressure value stored in the reference table to determine the amount of dust adhering to the first filter 5, and according to the determination result, 3 to control the output efficiency of the motor control unit 4 so as to increase or decrease the driving speed of the motor control unit 4.

That is, when the wind pressure passing through the first filter 5 is decreased, the second measurement value of the voltage or pressure ratio amplified by the first amplification unit 50 sensed by the first sensing unit 10 And the second measured value of the voltage or pressure ratio becomes higher when the wind pressure is increased. Therefore, the control unit 20 controls the wind speed and the wind speed according to the wind pressure and the second measured value of the voltage or pressure ratio associated therewith, The driving speed of the motor 3 is increased or decreased through the motor control unit 4 so that the suction force of the vacuum cleaner is always kept constant.

For example, when the wind pressure passing through the first filter 5 is low, the control unit 20 increases the driving speed of the motor 3 through the motor control unit 4. If the wind pressure is high, The suction force of the vacuum cleaner through the suction port 1a of the main body 1 is always kept constant as shown in FIG. 9 while performing a control operation of reducing the driving speed of the motor 3 through the suction port 4 And this control operation is carried out based on the mounted control program.

Here, the control unit 20 may include a CPU, a ROM, a RAM, a serial or parallel I / O port, a timer / counter processor, And a micro controller unit (MCU) that performs control functions.

In this case, the control unit 20 determines the amount of dust attached to the first filter 5 through the measurement information of the first sensing unit 10, which is composed of an analog or digital pressure sensor, Similarly, as in FIG. 8, which is appended to determine the amount of dust adhering to the first filter 5, or to a reference table in which first pressure values that match the first measured values of the voltage are stored, And the pressure values stored in the reference table are constructed through a number of experiments.

Therefore, when the first measured value of the voltage amplified by the first amplifier 50 is inputted, the controller 20 outputs a first pressure value matching the first measured value of the input voltage, It is possible to search from the reference table of Fig. 7, judge the dust adhesion amount of the first filter 5 from the detected first pressure value, display the result on the display unit 30, The second pressure value matching the second measured value of the pressure ratio according to the wind pressure measurement is measured from the reference table of Fig. 8 attached to the first filter 5, And a control program for allowing the display unit 30 to display the result of the determination.

The display unit 30 is formed on one surface of the main body 1 and is configured to display the dust adherence amount determined by the controller 20.

That is, according to the control operation of the control unit 20, the display unit 30 displays the dust attaching state of the first filter 5 as the normal A1 or the warning A2 as the pre- Or exchange A3 of the first filter 5 according to the control operation of the controller 20 and / or display the dust attachment state of the first filter 5 to the normal B1 or exchange The second display device B is configured to display the second display device B to display the warning B2 or the replacement B3 in the previous step in a graphic form and to display the first and second displays A and / B to visually confirm the display state of the first filter 5 and to decide whether to exchange the first filter 5.

1 to 9, when the power is supplied to the vacuum cleaner by the operation switch (not shown), the vacuum cleaner having the filter state notification function according to the embodiment of the present invention is operated by the controller 20 control the driving speed of the motor 3 through the motor control unit 4. [

A suction force is generated according to the driving speed of the motor 3, and various foreign substances and dusts present on the floor to be cleaned are forced through the suction port 1a formed on the bottom surface of the cleaner main body 1 from such suction force, So that various foreign matter, dust and the like that are forcedly sucked in can be introduced into the dust container 2 and dust can be collected.

The suction force for forcibly suctioning various foreign substances and dust into the dust container 2 passes through the first filter 5 together with the dust. The dust is filtered by the first filter 5, The wind along with the suction force passes through the first filter 5 and wind pressure is applied.

At this time, the filtering function of the first filter (5) is changed so that the wind pressure applied to the first filter (5) changes according to the amount of dust attached to the first filter (5) Of course, there is a problem that the suction force due to the driving of the motor 3 is lowered.

The first sensing unit 10, which is an analog or digital type pressure sensor disposed adjacent to the first filter 5, measures a wind pressure change amount applied to the first filter 5, And outputs the second measured value of the pressure ratio to the control unit 20. [

7 or FIG. 7, which is a first pressure value or a second pressure value, which is matched with the first measured value or the second measured value of the voltage or pressure ratio inputted using the judgment program loaded on the control unit 20, 8 based on the detected first pressure value or the second pressure value and determines the degree of adhesion of the dust on the first filter 5 and displays the result of the determination on the display unit 30, It is possible to inform that the first filter 5 is to be replaced.

That is, the display unit 30 displays the first display unit A and / or the second display unit B, and the first display unit A displays the first display unit A and the second display unit B according to the control operation of the controller 20, 5 is a normal A1 or a warning A2 or an exchange A3 prior to the exchange and the second indicator B indicates the state of the first filter B3 according to the control operation of the controller 20, The state of the first filter 5 is displayed as a normal B1 or a warning B2 or an exchange B3 before the replacement in a graphic form so that the user can disassemble the first filter 5 from the cleaner body It is possible to easily grasp the exchange time with respect to the filter 5 from the display information of the first display A and / or the second display B without the need to replace the first filter 5, The operating performance is deteriorated, or the amount of dust adhered to the first filter (5) The problem that occurs is more than being able to effectively prevent in advance.

In the meantime, the vacuum cleaner according to the embodiment of the present invention is characterized in that the airflower 6 is formed on the rear side of the main body 1, and the inside of the airflower 6 is not filtered by the first filter 5 The second filter 7 may be configured to filter the fine dust so as to block the fine dust that is not discharged from the main body 1 through the airflow 6, A second sensing unit 40 may be provided between the follower 6 to measure the wind pressure passing through the second filter 7 and output the measured wind pressure to the control unit 20, So that the user can be informed of the dust adhesion amount to the user.

The second sensing unit 40 may be an analog pressure sensor that outputs a first measured value of the voltage to the wind pressure passing through the second filter 7 to the controller 20, The first measured value of the voltage measured by the second sensing unit 40 is amplified by the second amplifying unit 60 and then converted into a digital signal and output to the controller 20.

The second sensing unit 40 is a digital pressure sensor that outputs a second measured value of the pressure ratio to the wind pressure passing through the second filter 7 to the control unit 20 in a digital communication manner It can also be configured.

Accordingly, the controller 20 has a reference table storing a first pressure value matching the first measured value of the voltage, and the controller 20 controls the voltage of the voltage amplified by the second amplifier 60, A first pressure value matching a first measured value of a voltage inputted when a first measured value is inputted is searched from the reference table and a dust adhesion amount of the second filter 7 is determined from the searched first pressure value The control unit 20 has a reference table in which the determination result is displayed on the display unit 30 or a second pressure value matching the second measured value of the pressure ratio is stored, From the reference table, a second pressure value in which a second measured value of a pressure ratio outputted from the first pressure value matching unit is matched with a second measured value of a pressure ratio inputted at the time of input, 7) And a determination program for displaying the determination result on the display unit 30 is mounted.

Hereinafter, in the embodiment of the present invention, the same effects as those of the first embodiment will be given, so that the same parts are denoted by the same reference numerals, and redundant explanations thereof are omitted.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is to be understood that the invention is not limited to the disclosed exemplary embodiments.

1: main body 1a; Inlet
2 ; Dustbin 3; motor
4 ; A motor control unit 5; The first filter
6; Airflower 7; The second filter
10; A first sensing unit 20; The control unit
30; Display section 40; The second sensing unit
50; A first amplification unit 60; The second amplifying unit

Claims (14)

A main body having a suction port; A dust container coupled to one end of the main body; A motor formed inside the main body and driven to suck dust through the suction port; A motor control unit for controlling an output efficiency of the motor; A first filter installed adjacently to the dust container and filtering the dust contained in the foreign substance to the outside of the dust container when foreign substances are introduced into the dust container through the suction port as the motor is driven; , ≪ / RTI &
A first sensing unit installed between the dust container and the motor and measuring a wind pressure passing through the first filter;
And a control unit for controlling the motor so as to increase or decrease the driving speed of the motor according to the judged dust adhesion amount, A control unit for controlling the control unit; And
A display unit formed on one side of the main body and displaying a dust adhering amount determined by the control unit so as to determine whether or not to exchange with the first filter; Wherein the filter status notification function is further configured to configure the filter status notification function. The vacuum cleaner according to claim 2, wherein the first sensing unit is an analog type pressure sensor that outputs a first measured value of a voltage with respect to a wind pressure passing through the first filter to the control unit. . 3. The apparatus according to claim 2, wherein the first measured value of the voltage measured by the first sensing unit is amplified by the first amplifying unit and then converted into a digital signal and output to the control unit Cleaner with function. The apparatus according to claim 1, wherein the first sensing unit is a digital pressure sensor that outputs a second measured value of a pressure ratio with respect to the wind pressure passing through the first filter to the control unit through a digital communication method. Cleaner with notification function. The apparatus of claim 3, wherein the control unit has a reference table storing a first pressure value matching the first measured value of the voltage, and the controller determines that the first measured value of the voltage amplified and output from the first amplifying unit is input A first pressure value matching with a first measured value of a voltage to be input is searched from the reference table, a dust adhesion amount of the first filter is determined from the searched first pressure value, and the determination result is displayed on the display unit And a judging program for judging whether or not the judging unit has judged that the judging unit has judged that the judging unit judges that the judging unit judges that the judging unit judges that the judging unit judges that the judging unit 5. The apparatus of claim 4, wherein the control unit has a reference table storing a second pressure value matching a second measured value of the pressure ratio, and the controller calculates a second measured value of the pressure ratio output from the digital pressure sensor Searching for a second pressure value matching the second measured value of the input pressure ratio at the time of the input from the reference table, judging the dust adhesion amount of the first filter from the searched second pressure value, And a judgment program to be displayed on the display unit is mounted on the display unit. The method according to claim 1,
And a second filter for filtering the fine dust so as to prevent fine dust not filtered by the first filter from being discharged to the outside of the main body through the air filter is formed inside the air filter at the rear side of the main body, filter; , ≪ / RTI &
A second sensing unit disposed between the motor and the air flow sensor for measuring a wind pressure passing through the second filter and outputting the measured wind pressure to the control unit; Wherein the filter condition notification function is installed in the vacuum cleaner. The vacuum cleaner according to claim 7, wherein the second sensing unit is an analog type pressure sensor that outputs a first measured value of a voltage with respect to the wind pressure passing through the second filter to the control unit. . 9. The apparatus according to claim 8, wherein the first measured value of the voltage measured by the second sensing unit is amplified by the second amplifying unit and then converted into a digital signal and outputted to the control unit Cleaner with function. The apparatus according to claim 7, wherein the second sensing unit is a digital pressure sensor that outputs a second measured value of a pressure ratio with respect to a wind pressure passing through the second filter to the control unit through a digital communication method. Cleaner with notification function. The apparatus of claim 9, wherein the controller has a reference table storing a first pressure value matching the first measured value of the voltage, and the controller determines that the first measured value of the voltage amplified by the second amplifier A first pressure value matching with a first measured value of a voltage to be input is searched from the reference table, a dust adhesion amount of the second filter is determined from the searched first pressure value, and the determination result is displayed on the display unit And a judging program for judging whether or not the judging unit has judged that the judging unit has judged that the judging unit judges that the judging unit judges that the judging unit judges that the judging unit judges that the judging unit 11. The method according to claim 10, wherein the control unit has a reference table storing a second pressure value matching a second measured value of the pressure ratio, and the controller calculates a second measured value A second pressure value matching the second measured value of the input pressure ratio at the time of the input is searched from the reference table, a dust adhesion amount of the second filter is determined from the searched second pressure value, And a judgment program to be displayed on the display unit is mounted on the display unit. The display device according to claim 7, wherein the display unit is configured to display a first indicator that displays a warning or an exchange, the status of the first filter or the second filter being normal or pre-exchange according to the control operation of the control unit Features a filter status notification function with a vacuum cleaner. The display device according to claim 7, wherein the display unit displays a second indicator that displays a state of the first filter or the second filter in a normal or pre-exchange step, Wherein the filter state notification function is configured to notify the user of the filter condition.

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