Space purification device

Abstract

To provide a space purification device highly accurately performing determination that a dust filter is required to be cleaned.SOLUTION: A space purification device includes: a body case 1 having a suction port 2 sucking air in a prescribed space and an outlet 6 blowing out air to the prescribed space; a blowing part 11 guiding the air from the suction port 2 to the outlet 6; a dust filter 13 eliminating fine particles from the air sucked from the suction port 2; a light-emitting part 28 emitting light to a dust filter 13; a light receiving part 29 receiving the light emitted by the light emitting part 28 and passing through the dust filter 13; and a determination part 25 determining whether or not the dust filter 13 is required to be cleaned on the basis of an amount of the light received by the light receiving part 29.SELECTED DRAWING: Figure 3

Description

Technical Field

[0001] The present invention relates to a space purification device.

Background Art

[0002] Conventionally, in order to remove (including inactivation) bacteria, fungi, viruses, odors, etc. in the air, an electrolyzed water spraying device as a space purification device that generates and releases hypochlorous acid water by electrolysis is known (for example, see Patent Document 1).

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] Some space purification devices are equipped with a dust filter to remove fine particles such as dust from the inhaled air. However, when the space purification device is operated for a long time, fine particles accumulate on the entire dust filter, clogging occurs in the entire dust filter, and it becomes difficult for air to pass through the dust filter. As a result, the performance of purifying the space may deteriorate. Therefore, for example, when the operation time of the space purification device has elapsed a predetermined time, it may be considered to determine that fine particles have accumulated on the entire dust filter and the dust filter needs to be cleaned.

[0005] However, the amount of fine particles in the space where the space purification device is installed changes over time depending on the presence or absence of human traffic and ventilation. That is, the time until fine particles accumulate on the dust filter of the space purification device and the state where fine particles accumulate on the entire dust filter varies depending on the environment in the space.

[0006] Therefore, in an environment where it is difficult for fine particles to be generated in the space, even if the operation time has elapsed for a predetermined time, the fine particles have not accumulated on the entire dust filter. That is, without knowing whether the fine particles have accumulated on the entire dust filter, the determination of whether the dust filter needs to be cleaned is made only based on the operation time.

[0007] Therefore, the present invention solves the above problems, and an object thereof is to provide a space purification device that accurately determines that fine particles have accumulated on the dust filter and that the dust filter needs to be cleaned.

Means for Solving the Problems

[0008] And, in order to achieve this object, the space purification device according to the present invention includes a main body case having a suction port for sucking air in a predetermined space and a blowout port for blowing air into the predetermined space, a blower unit for guiding air from the suction port to the blowout port, a dust filter for removing fine particles from the air sucked from the suction port, a light emitting unit for irradiating light toward the dust filter, a light receiving unit for receiving the light irradiated by the light emitting unit and passing through the dust filter, and a determination unit for determining whether the dust filter needs to be cleaned based on the amount of light received by the light receiving unit. Thereby, the intended object is achieved.

Effects of the Invention

[0009] According to the present invention, it is possible to provide a space purification device that accurately determines that fine particles have accumulated on the dust filter and that the dust filter needs to be cleaned.

Brief Description of the Drawings

[0010]

Figure 1

Figure 2

Figure 3

Figure 4

Figure 5

Embodiments for Carrying Out the Invention

[0011] Hereinafter, embodiments for carrying out the present invention will be described with reference to the drawings. However, the embodiments shown below are examples for embodying the technical idea of the present invention, and the present invention is not limited to the following. In particular, the materials, shapes, components, arrangements and relative arrangements of the components described in the embodiments are examples, and are not intended to limit the scope of the present invention thereto. Also, in each figure, the same reference numerals are given to substantially the same configurations, and duplicate explanations are omitted or simplified. In addition, the dimensions of the members in each drawing are appropriately enlarged or reduced for easy understanding. Also, in each drawing, some of the members that are not important for explaining the embodiment are omitted.

[0012] (Embodiment) First, the space purification device D according to the present embodiment will be described. The space purification device D is a device that is installed in a predetermined space and purifies the air existing in the predetermined space where the space purification device D is installed.

[0013] FIG. 1 is a perspective view of the space purification device D. FIG. 2 is a perspective view of the space purification device D with the side panel 3 of FIG. 1 opened.

[0014] As shown in FIGS. 1 and 2, the space purification device D includes a main body case 1.

[0015] The main body case 1 is a substantially box-shaped casing, and includes a suction port 2, a blowout port 6, a notification unit 7, a side panel 3, and a front panel 4.

[0016] The suction port 2 is provided on the front panel 4 side of both side surfaces of the main body case 1, and is a lattice-shaped opening for taking in the air outside the main body case 1 into the main body case 1. That is, the suction port 2 is an opening for taking in the air in a predetermined space.

[0017] The air outlet 6 is provided on the top surface of the main body case 1. The air outlet 6 is an opening / closing type opening for blowing out the air taken into the main body case 1 from the suction port 2 to the outside of the main body case 1. That is, the air outlet 6 is an opening for blowing out the air into a predetermined space. In FIGS. 1 and 2, the air outlet 6 is in a closed state.

[0018] The notification unit 7 is provided on the top surface of the space purification device D, and an LED is used as an example. The notification unit 7 receives a signal (command) from the control unit 8 described later and lights or turns off the LED. The notification unit 7 notifies the user that the dust filter 13 needs to be cleaned by lighting the LED. Also, the notification unit 7 may notify the user that the dust filter 13 needs to be cleaned by using a sound such as voice or buzzer instead of the LED.

[0019] The side panel 3 is provided on the main body side surface 1A which is the right side surface in the front view of the main body case 1. The side panel 3 is an openable / closable cover and is mainly formed of a plastic resin. One of the two suction ports 2 is provided on the front side of the main body case 1 in the side panel 3. The inside of the side panel 3 is the inside of the main body case 1.

[0020] The front panel 4 is provided on the front surface of the main body case 1. The front panel 4 is a removable cover and is mainly formed of a plastic resin. The user can clean the dust filter 13 by removing the front panel 4. The back side of the front panel 4 is the inside of the main body case 1.

[0021] Also, as shown in FIGS. 2 and 3, an electrolytic cell 5, an electrode part 18, and a water storage tank 9 are provided in the main body case 1. FIG. 3 is a side cross-sectional view of the space purification device D.

[0022] The electrolytic cell 5 has a box shape with an open top surface and is structured to store water. The electrolytic cell 5 is disposed at the lower part of the main body case 1 and is detachable from the main body case 1 by sliding in the horizontal direction with respect to the main body case 1. The electrolytic cell 5 mixes the electrolysis accelerator and water. Specifically, it mixes the electrolysis accelerator supplied to the electrolytic cell 5 and the water supplied. In this embodiment, the supply of water to the electrolytic cell 5 is performed by the water storage tank 9, but the water may be directly supplied to the electrolytic cell 5 by the user. The supply of the electrolysis accelerator to the electrolytic cell 5 may be performed by the user, or an electrolysis accelerator supply unit for supplying the electrolysis accelerator may be provided and the control unit 8 may control the electrolysis accelerator supply unit to supply the electrolysis accelerator. Here, the dissolution of the electrolysis accelerator in water is also regarded as the mixing of the electrolysis accelerator and water. When the electrolysis accelerator dissolves in water, water containing chloride ions is stored in the electrolytic cell 5. An example of the electrolysis accelerator is sodium chloride.

[0023] The electrode unit 18 generates hypochlorous acid water from the electrolysis accelerator and water mixed in the electrolytic cell 5. The electrode unit 18 includes an electrode member, and this electrode member is installed so as to be immersed in the water in the electrolytic cell 5. The electrode unit 18 electrochemically electrolyzes the water containing chloride ions in the electrolytic cell 5, that is, the electrolyzed water, by energizing this electrode member to generate hypochlorous acid water.

[0024] Further, the electrode unit 18 may generate hypochlorous acid water by repeating a plurality of times a cycle that includes the energization time for energizing the electrode member for electrolysis and the time after the energization stops, that is, the non-energization time which is the time when no energization is performed. By providing a non-energization time for the electrode member, the life of the electrode member can be extended. Note that if the energization time is made longer with respect to the non-energization time, a larger amount of hypochlorous acid is generated per cycle. Also, if the non-energization time is made longer with respect to the energization time, the amount of hypochlorous acid generated per cycle can be suppressed. Furthermore, if the amount of electric power during the energization time is increased, more hypochlorous acid is generated.

[0025] The water storage tank 9 is arranged above the electrolytic cell 5. The water storage tank 9 has a structure that can be detached from the electrolytic cell 5 and the main body case 1. The water storage tank 9 is a hollow container capable of storing water and supplies water to the electrolytic cell 5. The water storage tank 9 is provided with a lid 10.

[0026] The lid 10 is provided at an opening located at the lower part of the water storage tank 9. The center of the lid 10 has an opening / closing part. When the opening / closing part opens, the water in the water storage tank 9 is supplied to the electrolytic cell 5. Specifically, when the opening of the water storage tank 9 is facing downward and attached to the electrolytic cell 5, the opening / closing part of the lid 10 opens. That is, when water is put into the water storage tank 9 and attached to the electrolytic cell 5, the opening / closing part of the lid 10 opens and water is supplied from the water storage tank 9 to the electrolytic cell 5. When water supply is carried out and the water level in the electrolytic cell 5 rises to reach the position of the lid 10, the opening / closing part of the lid 10 is sealed by water, so the water supply from the water storage tank 9 stops and water remains in the water storage tank 9. And when the water level in the electrolytic cell 5 drops, each time, the water in the water storage tank 9 is supplied to the electrolytic cell 5. That is, the water level in the electrolytic cell 5 is kept constant.

[0027] Inside the main body case 1, there are further provided a blower unit 11, a purification unit 12, a dust filter 13, a control unit 8, an optical sensor unit 14, and a reflection unit 15.

[0028] The blower unit 11 is provided at the central part inside the main body case 1 and guides air from the suction port 2 to the blowout port 6. The blower unit 11 is provided with a fan. The fan is, for example, a sirocco fan and rotates according to the control by the control unit 8. When the fan rotates, air is sucked into the main body case 1 from the suction port 2. The air sucked in from the suction port 2 is blown out from the blowout port 6 via the dust filter 13 and the purification unit 12 described later.

[0029] The purification unit 12 purifies the air by bringing the hypochlorous acid water generated in the electrolytic cell 5 into contact with the air sucked in from the suction port 2. The purification unit 12 is provided with a purification filter.

[0030] The purification filter is a member that brings the hypochlorous acid water generated in the electrolytic cell 5 into contact with the air that has flowed into the main body case 1 by the blower unit 11. The purification filter is configured in a hollow cylindrical shape, and air flows through the hollow space from the side surface in the cylindrical shape toward the opposite side surface. Therefore, the side surface portion through which the air passes has a mesh structure. The purification filter includes a cylindrical skeleton for maintaining the shape of the mesh structure in the hollow space in a cylindrical shape, and the mesh structure is arranged around the skeleton while maintaining the cylindrical shape. The purification filter is arranged with the central axis of the circle in the cylindrical shape horizontally, and is built in a configuration that can rotate around the central axis as the rotation center to the electrolytic cell 5.

[0031] One end of the purification filter, specifically, a part of the arc that constitutes the side surface is immersed in the hypochlorous acid water. In this state, by a driving member for rotating the purification filter, the purification filter is rotated around the central axis of the circle in the cylindrical shape as the rotation center, so that the purification filter retains the hypochlorous acid water over the entire side surface. Further, by rotation, the purification filter alternately contacts the hypochlorous acid water and the air. The air passes from the side surface of the purification filter to the opposite side surface, that is, when the air contacts the hypochlorous acid water, the purification unit 12 can purify the air. Further, the air after passing through the purification filter contains hypochlorous acid.

[0032] The dust filter 13 is a filter provided on the front side in the main body case 1 and is detachable from the main body case 1. The user can attach and detach the dust filter 13 from the main body case 1 by removing the front panel 4. The dust filter 13 purifies the air sucked from the suction port 2 by collecting (removing) fine particles such as dust and viruses from the air sucked from the suction port 2, and the purified air is discharged to a predetermined space via the purification unit 12, the blower unit 11, and the air outlet 6. An example of the dust filter 13 is a HEPA (High-Efficiency Particulate Air) filter.

[0033] Incidentally, inside the main body case 1, an air passage 16 is formed that extends from the suction port 2 to the dust filter 13, the purification unit 12, the blower unit 11, and the air outlet 6. When the fan of the blower unit 11 rotates, the air sucked in from the suction port 2 and entering the air passage 16 is blown out of the main body case 1 through the dust filter 13, the purification unit 12, the blower unit 11, and the air outlet 6 in sequence. That is, the fine particles in the predetermined space can be removed by the dust filter 13, thereby cleaning the predetermined space. Also, the air containing hypochlorous acid water in the electrolytic cell 5 is discharged to the outside. That is, the purification unit 12 purifies the predetermined space using the hypochlorous acid water generated in the electrolytic cell 5.

[0034] The control unit 8 is the control circuit of the space purification device D and controls the space purification device D. Details will be described later.

[0035] The optical sensor unit 14 is provided on the back surface of the dust filter 13 and includes a light emitting unit 28 and a light receiving unit 29. That is, the optical sensor unit 14 is a unit in which the light emitting unit 28 and the light receiving unit 29 are integrated.

[0036] The light emitting unit 28 irradiates light toward the dust filter 13. The light source of the light irradiated from the light emitting unit 28 is, for example, an LED light source made of a compound semiconductor. The light irradiated from the light emitting unit 28 passes through the dust filter 13 and is reflected by the reflecting unit 15.

[0037] The reflecting unit 15 is a member that reflects the light irradiated by the light emitting unit 28 after passing through the dust filter 13, and is, for example, a reflecting plate that can reflect the wavelength of the light irradiated by the light emitting unit 28. The reflecting unit 15 is provided at a position facing the light emitting unit 28 with the dust filter 13 interposed therebetween. The reflecting unit 15 is provided on the back side of the front panel 4.

[0038] The light reflected by the reflection unit 15 and passing through the dust filter 13 again is received by the light receiving unit 29. That is, the light receiving unit 29 receives the light irradiated from the light emitting unit 28 and reflected by the reflection unit 15. The light receiving unit 29 includes a light receiving element, and the light receiving element receives the light reflected by the reflection unit 15 and converts it into an electrical signal. The light receiving element generates an electrical signal corresponding to the amount of received light (i.e., intensity) of the light by performing photoelectric conversion on the received light. The generated electrical signal is output to the control unit 8. The light receiving element is, for example, a photodiode, but is not limited thereto. For example, the light receiving element may be a phototransistor or an image sensor.

[0039] As described above, an optical path 17 is formed from the light emitting unit 28 to the reflection unit 15 and then to the light receiving unit 29. The light irradiated from the light emitting unit 28 passes through the dust filter 13 and reaches the reflection unit 15, and the light reflected by the reflection unit 15 passes through the dust filter 13 again and reaches the light receiving unit 29. That is, it can be said that the light receiving unit 29 receives the light irradiated by the light emitting unit 28 and passing through the dust filter.

[0040] Next, with reference to FIG. 4, each function of the control unit 8 according to the embodiment of the present invention will be described. FIG. 4 is a schematic functional block diagram of the control unit 8 and its peripheral parts.

[0041] The control unit 8 includes a light emission control unit 23, an acquisition unit 24, a storage unit 27, a determination unit 25, and a notification control unit 26.

[0042] The light emission control unit 23 controls the light emission of the light emitting unit 28. Specifically, the light emission control unit 23 controls the light emitting unit 28 to irradiate light at a predetermined time. The predetermined time can be arbitrarily set, for example, at the start of operation, every hour after the start of operation, etc.

[0043] The acquisition unit 24 acquires an electrical signal corresponding to the amount of received light from the light receiving unit 29. That is, the acquisition unit 24 acquires the amount of received light received by the light receiving unit 29. The amount of received light indicates the magnitude of the amount of light received by the light receiving unit 29.

[0044] The memory unit 27 stores a threshold value and is a so-called memory. The threshold value is used to determine the magnitude of the amount of light received by the light receiving unit 29. The threshold value is a value determined in advance by experiments or the like and can be arbitrarily set.

[0045] The determination unit 25 determines whether cleaning of the dust filter 13 is necessary based on the amount of light received by the light receiving unit 29. Specifically, the determination unit 25 compares the amount of light received from the acquisition unit 24 with the threshold value stored in the memory unit 27 to determine whether cleaning of the dust filter 13 is necessary. If the amount of light received by the light receiving unit 29 is less than or equal to the threshold value, the determination unit 25 determines that cleaning of the dust filter 13 is necessary.

[0046] Here, the reason why the determination unit 25 performs control to determine that cleaning of the dust filter 13 is necessary when the amount of light received is less than or equal to the threshold value will be explained.

[0047] The amount of light received becomes smaller as fine particles accumulate on the dust filter 13. This is because as fine particles accumulate on the dust filter 13, the amount of light attenuation when passing through the dust filter 13 due to the accumulated fine particles increases.

[0048] That is, in the initial state when the user purchases the space purification device D, there is little accumulation of fine particles on the dust filter 13 and the initial light reception amount is a large value. However, as the operating time of the space purification device D increases, the light reception amount becomes smaller from the initial light reception amount. That is, the accumulation condition of the fine particles on the dust filter 13 can be grasped by the magnitude of the light reception amount. When the accumulation of fine particles on the dust filter 13 increases, clogging occurs in the entire dust filter 13, and it becomes difficult for air to pass through the dust filter 13. As a result, the amount of air passing through the purification unit 12 decreases, and the performance of purifying a predetermined space may deteriorate. Therefore, it is desirable to notify the user that the dust filter 13 needs to be cleaned before the deterioration of the purification performance occurs. However, frequently notifying the user that the dust filter 13 needs to be cleaned is troublesome for the user and reduces the comfort of the user. Therefore, it is desirable to notify the user that the dust filter 13 needs to be cleaned at the timing when the deterioration of the purification performance occurs.

[0049] Therefore, for example, in advance, the light reception amount at the timing when the deterioration of the purification performance occurs is measured through experiments or the like, and the measured light reception amount is stored in the storage unit 27 as a threshold value. Then, when the light reception amount is equal to or less than the threshold value, the determination unit 25 determines that the dust filter 13 needs to be cleaned. Thereby, the timing when the dust filter 13 needs to be cleaned can be determined with high accuracy. The above is the reason why the determination unit 25 performs control to determine that the dust filter 13 needs to be cleaned when the light reception amount is equal to or less than the threshold value.

[0050] When the determination unit 25 determines that the dust filter 13 needs to be cleaned, the notification control unit 26 performs control to notify the user that the dust filter 13 needs to be cleaned via the notification unit 7. The notification unit 7 lights up an LED to notify the user that the dust filter 13 needs to be cleaned. Thereby, the user can grasp that the dust filter 13 needs to be cleaned.

[0051] Each functional block of the control unit 8 can be realized as hardware by elements and mechanical devices including the CPU (Central Processing Unit) of a computer, and can be realized as software by a computer program or the like. Here, it is a functional block realized by the cooperation of these. Therefore, these functional blocks can be realized in various forms by a combination of hardware and software.

[0052] In the above configuration, the control executed by the control unit 8 will be described using the flowchart of FIG. 5. FIG. 5 is a flowchart showing the control executed by the control unit 8 according to the embodiment. Here, in the flowchart, numbers are assigned with S as the initial letter. For example, S1 etc. indicate processing steps. However, the magnitude of the numerical values indicating the processing steps has no relation to the processing order.

[0053] First, the light emission control unit 23 instructs the light emission unit 28 to emit light, and the light emission unit 28 irradiates light (S1).

[0054] The acquisition unit 24 acquires the amount of received light from the light receiving unit 29 (S2).

[0055] The determination unit 25 determines whether the amount of received light acquired by the acquisition unit 24 is less than or equal to the threshold value (S3).

[0056] When the amount of received light is greater than the threshold value, the determination unit 25 determines that cleaning of the dust filter 13 is unnecessary (No in S3 → end). Thereby, when it is the timing when cleaning of the dust filter 13 is unnecessary, since the user is not notified that cleaning is necessary, it is possible to suppress the user from cleaning the dust filter 13 more than necessary, and it is possible to suppress a decrease in the comfort of the user.

[0057] When the amount of received light is equal to or less than the threshold value, the determination unit 25 determines that the dust filter 13 needs to be cleaned, and the notification control unit 26 notifies, via the notification unit 7, that the dust filter 13 needs to be cleaned (Yes in S3 → S4). As a result, it is possible to determine that the dust filter 13 needs to be cleaned at an appropriate timing when the purification performance deteriorates. Also, the user can recognize that the dust filter 13 needs to be cleaned at an appropriate timing.

[0058] As described above, the present invention has been described based on the embodiments. However, the present invention is not limited to the above embodiments at all, and it can be easily inferred that various improvements and modifications are possible without departing from the spirit of the present invention.

[0059] In the present embodiment, the light emitting unit 28 and the light receiving unit 29 are configured by an integrated optical sensor unit, but the light emitting unit 28 and the light receiving unit 29 do not have to be configured by an integrated optical sensor unit. For example, a light emitting unit may be provided at the position of the optical sensor unit 14 of the present embodiment, and a light receiving unit may be provided at the position of the reflection unit 15 of the present embodiment. In addition, a light emitting unit may be provided at the position of the reflection unit 15 of the present embodiment, and a light receiving unit may be provided at the position of the optical sensor unit 14 of the present embodiment. In these cases, the reflection unit becomes unnecessary.

[0060] As a result, the light receiving unit is irradiated by the light emitting unit and receives the light that has passed through the dust filter. The threshold value in the case corresponding to this configuration is stored in the storage unit, and the determination unit determines whether the dust filter needs to be cleaned based on the amount of received light received by the light receiving unit. That is, the determination unit determines that the dust filter needs to be cleaned if the amount of received light received by the light receiving unit is equal to or less than the threshold value. As a result, the present invention can be realized even if the light emitting unit and the light receiving unit are not configured by an integrated optical sensor unit.

[0061] (Summary of the Invention) The air purification device according to the present invention includes a main body case having a suction port for sucking air in a predetermined space and a blowout port for blowing air into the predetermined space, a blower unit for guiding air from the suction port to the blowout port, a dust filter for removing fine particles from the air sucked in from the suction port, a light emitting unit for irradiating light toward the dust filter, a light receiving unit for receiving the light irradiated by the light emitting unit and passing through the dust filter, and a determination unit for determining whether cleaning of the dust filter is necessary based on the amount of light received by the light receiving unit. Thereby, it is possible to accurately determine whether fine particles are deposited on the dust filter and whether cleaning of the dust filter is necessary.

[0062] Further, it may include a reflection unit that reflects the light irradiated by the light emitting unit and passing through the dust filter, and the light receiving unit receives the light reflected by the reflection unit and passing through the dust filter again, and the light emitting unit and the light receiving unit may be constituted by an integrated optical sensor unit. Since the light emitting unit and the light receiving unit can be integrated, the power supply structure for the light emitting unit and the light receiving unit and the control structure for the light emitting unit and the light receiving unit can be simplified.

[0063] Further, the determination unit may determine that cleaning of the dust filter is necessary if the amount of light received by the light receiving unit is equal to or less than a threshold value. Thereby, the degree of clogging of the dust filter can be quantified and the appropriate timing for cleaning can be determined.

[0064] Further, when the determination unit determines that cleaning of the dust filter is necessary, it may include a notification unit for notifying that cleaning of the dust filter is necessary. Thereby, it is possible to notify the user that cleaning is necessary at an appropriate timing when cleaning of the dust filter is necessary.

[0065] Further, it may include an electrolytic cell that mixes an electrolysis accelerator and water, an electrode unit that generates hypochlorous acid water from the electrolysis accelerator and water mixed in the electrolytic cell, and a purification unit that purifies air by bringing the hypochlorous acid water sucked from the suction port into contact with the sucked air. Thereby, it is possible to remove (including inactivation) bacteria, fungi, viruses, odors, etc. in the air and purify the air in a predetermined space.

Industrial Applicability

[0066] The present invention is useful in a space purification device equipped with a dust filter.

Explanation of Signs

[0067] D Space purification device 1 Main body case 1A Side surface of the main body 2 Suction port 3 Side panel 4 Front panel 5 Electrolytic cell 6 Air outlet 7 Notification unit 8 Control unit 9 Water storage tank 10 Lid 11 Blower unit 12 Purification unit 13 Dust filter 14 Optical sensor unit 15 Reflection part 16 Air passage 17 Optical path 18 Electrode unit 23 Light emission control unit 24 Acquisition unit 25 Judgment unit 26 Notification control unit 27 Memory unit 28 Light emission part 29 Light receiving part

Claims

1. A main body case having an intake port for sucking air in a predetermined space and an outlet port for blowing air into the predetermined space, A blower unit for guiding air from the intake port to the outlet port, A dust filter for removing fine particles from the air sucked in from the intake port, A light emitting unit for irradiating light toward the dust filter, A light receiving unit for receiving the light irradiated by the light emitting unit and passing through the dust filter, A space purification device comprising a determination unit for determining whether cleaning of the dust filter is necessary based on the amount of light received by the light receiving unit.

2. It includes a reflection unit that reflects the light irradiated by the light emitting unit and passing through the dust filter, and the light receiving unit Receives the light reflected by the reflection unit and passing through the dust filter again, The space purification device according to claim 1, wherein the light emitting unit and the light receiving unit are constituted by an integrated optical sensor unit.

3. The determination unit The space purification device according to claim 1, wherein if the amount of light received by the light receiving unit is equal to or less than a threshold value, it is determined that cleaning of the dust filter is necessary.

4. The space purification device according to claim 1, further comprising a notification unit for notifying that cleaning of the dust filter is necessary when the determination unit determines that cleaning of the dust filter is necessary.

5. An electrolytic cell for mixing an electrolysis promoter and water, An electrode unit for generating hypochlorous acid water from the electrolysis promoter and the water mixed in the electrolytic cell, The space purification device according to claim 1, further comprising a purification unit for purifying air by bringing the hypochlorous acid water into contact with the air sucked in from the intake port.

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