JP2024060382A - Air cleaner - Google Patents

Abstract

[Problem] To provide an air purifier that can suppress a decrease in the inactivation effect caused by ultraviolet rays even when the dust-collecting filter is pleated. [Solution] The air purifier includes a housing, a pleated dust-collecting filter disposed within the housing, a fan that generates an air flow that passes through the dust-collecting filter, and a plurality of ultraviolet lamps that are provided upstream of the dust-collecting filter and irradiate the upstream surface of the dust-collecting filter with ultraviolet rays. [Selected Figure] Figure 12

Description

This disclosure relates to an air purifier having a dust collection filter.

The performance of an air purifier depends largely on the filters it contains. For example, Patent Document 1 describes an air purifier that has a pre-filter, a deodorizing filter, and a dust-collecting filter. Air that flows into the air purifier passes through the pre-filter, the deodorizing filter, and the dust-collecting filter, in that order, before being exhausted.

The prefilter captures relatively large dust particles. The deodorizing filter contains activated carbon and photocatalysts. The dust collection filter captures fine dust particles that are not captured by the prefilter. For example, a HEPA (High Efficiency Particulate Air) filter is used as the dust collection filter.

In addition, as described in Patent Document 2, for example, there are also air purifiers that have a sterilization function. This type of air purifier is installed and used, for example, in medical booths that house patients with infectious diseases. This type of air purifier has, for example, an ultraviolet lamp, and is designed to sterilize (or inactivate) bacteria and viruses captured by a dust collection filter using the ultraviolet lamp.

JP 2014-213005 A JP 2021-180826 A

By the way, a pleated shape is sometimes used for dust collection filters. By minimizing the pleat shape, the surface area can be increased and pressure loss can be reduced. In this case, it becomes difficult for the ultraviolet light from the ultraviolet lamp to reach the depths of the pleats, which may result in a decrease in the effectiveness of the ultraviolet lamp in inactivating bacteria and viruses.

The present disclosure has been made in consideration of the above points, and provides an air purifier that can suppress the decrease in the inactivation effect caused by ultraviolet rays, even when the dust collection filter is pleated.

One aspect of the air purifier of the present disclosure is:
A housing and
A dust collecting filter having a pleated shape and disposed in the housing;
A fan that generates an airflow passing through the dust collecting filter;
a plurality of ultraviolet lamps provided upstream of the dust collecting filter and configured to irradiate an upstream surface of the dust collecting filter with ultraviolet light;
Equipped with.

According to the present disclosure, multiple ultraviolet lamps are provided to irradiate the upstream surface of the dust collection filter with ultraviolet light, so that even if the dust collection filter has a pleated shape, it is possible to suppress a decrease in the inactivation effect caused by ultraviolet light.

FIG. 1 is a diagram showing an air purifier according to an embodiment arranged in a medical booth. FIG. 1 is an exploded perspective view of an air purifier according to an embodiment; FIG. 13 is a perspective view for explaining a filter removal structure. A perspective view of the air purifier with the exhaust port cover attached to the exhaust port, seen obliquely from above A perspective view of the air purifier with the exhaust port cover removed, seen from diagonally above FIG. 13 is a perspective view illustrating how the attachment is attached to the top cover; FIG. 13 is a perspective view illustrating how the attachment is attached to the top cover; FIG. 4 is a perspective view showing a detailed configuration of a top cover; FIG. 13 is a perspective view illustrating the relationship between the top cover and the attachment; FIG. 1 is a diagram showing the shape of pleats of a dust collecting filter according to an embodiment. Diagram showing the shape of the pleats in a typical dust collection filter FIG. 2 is a schematic top view showing the relationship between the dust collecting filter and the ultraviolet lamp in the embodiment; FIG. 2 is a schematic top view showing the relationship between the dust collecting filter and the ultraviolet lamp in the embodiment; FIG. 11 is a schematic top view showing the relationship between a dust collecting filter and an ultraviolet lamp in a comparative example. FIG. 2 is a block diagram for explaining the control of an ultraviolet lamp according to an embodiment; FIG. 1 shows a configuration of another embodiment.

The following describes in detail the embodiments of the present disclosure with reference to the drawings.

<1> Installation in a Medical Booth First, before describing the configuration of the air purifier of this embodiment, an installation example of the air purifier of this embodiment will be described.

The air purifier 100 of this embodiment is placed in a medical booth 10 as shown in Figure 1. Figure 1 is a view of the medical booth 10 and the air purifier 100 as seen from the front. Below, the ±X directions in the figure are referred to as the left-right directions, the ±Y directions as the front-rear directions, and the ±Z directions as the up-down directions.

The medical booth 10 is broadly divided into a frame body 11 and a partition body 12 that separates the internal space formed by the frame body 11 from the external space. In the present embodiment, the frame body 11 is foldable, and the partition body 12 is a non-flammable transparent vinyl sheet.

A duct 13 is connected to the exhaust port of the air purifier 100. The duct 13 is drawn out through a duct insertion hole 12a formed in the partition 12. As a result, air sterilized by the air purifier 100 is exhausted to the outside of the medical booth 10 through the duct 13. Note that in the example of FIG. 1, the duct insertion hole 12a is provided on the side of the partition 12, which is a vinyl sheet, but the duct insertion hole 12a may also be provided on the top or back of the partition 12.

As shown in FIG. 1, when an air purifier 100 is installed inside a medical booth 10 and the air sterilized by the air purifier 100 is exhausted to the outside of the medical booth 10 through a duct 13, the inside of the medical booth 10 is essentially under negative pressure. As a result, although air from outside the medical booth 10 may enter the inside of the medical booth 10 through gaps in the vinyl sheet (partition body 12), the air inside the medical booth 10 will not leak out to the outside of the medical booth 10. As a result, viruses and the like inside the medical booth 10 can be prevented from leaking out to the outside.

<2> Overall Configuration of Air Purifier Next, the overall configuration of the air purifier 100 of this embodiment will be described with reference to Fig. 2. Fig. 2 is an exploded perspective view of the air purifier 100.

As can be seen from FIG. 2, the air purifier 100 is covered by a housing that is composed of a top cover 110, a base 120, a front cover 130, a rear cover 140, an upper rear cover 140a, and side covers 150 and 160.

A fan case 170 is provided within the housing of the air purifier 100, and a fan motor 171 and a sirocco fan 172 are provided in the fan case 170. When the sirocco fan 172 is driven to rotate by the fan motor 171, an air flow in the -Y direction is generated within the housing.

The airflow generated by the sirocco fan 172 flows from the rear cover 140 to the front cover 130, so in the following description, the rear cover 140 side is sometimes referred to as the upstream side and the front cover 130 side is sometimes referred to as the downstream side.

A main body frame 180 is provided adjacent to the fan case 170. The main body frame 180 is erected on the base 120. An opening 181 is formed in the main body frame 180, and when the sirocco fan 172 is driven to rotate, air is drawn into the sirocco fan 172 through this opening 181.

Between the main body frame 180 and the rear cover 140, a pre-filter 210, a deodorizing filter 220, a light shielding plate 230, an ultraviolet lamp 240, a metal case 250 and a dust collection filter 260 are provided in this order from the upstream side to the downstream side.

A mesh-shaped suction port is formed in the rear cover 140. The pre-filter 210 captures relatively large dust particles. The deodorizing filter 220 is composed of a deodorizing agent such as activated carbon. The light shielding plate 230 is provided so that the light from the ultraviolet lamp 240 does not leak to the outside through the rear cover 140. Here, the external size of the light shielding plate 230 is set to the minimum size that can cover the ultraviolet lamp 240. This allows the light shielding plate 230 to block ultraviolet light while minimizing the reduction in air flow caused by the light shielding plate 230.

Incidentally, an adjustment plate (not shown) may be provided between the ultraviolet lamp 240 and the dust collection filter 260 to adjust the level of ultraviolet light irradiated onto the dust collection filter 260. This makes it possible to prevent deterioration of the dust collection filter 260 caused by the dust collection filter 260 being irradiated with ultraviolet light of a certain intensity or higher. The adjustment plate (not shown) is a plate with many holes formed therein. The level of ultraviolet light irradiated onto the dust collection filter 260 can be adjusted according to the size and number of the holes.

The metal case 250 is a frame body to which the ultraviolet lamp 240 and the light shielding plate 230 are attached. The metal case 250 has a power supply line that supplies power to the ultraviolet lamp 240. The ultraviolet light generated by the ultraviolet lamp 240 is irradiated onto the dust collection filter 260.

As shown in FIG. 3, the dust collection filter 260 has a frame body 261 and a filter body 262 supported by the frame body 261. In this embodiment, the filter body 262 is a ULPA (Ultra-Low Penetration Air) filter. The ULPA filter captures bacteria and viruses in the medical booth 10. The bacteria and viruses captured by the ULPA filter are inactivated by ultraviolet light. Note that instead of the ULPA filter, a HEPA filter, for example, may be used as the filter body 262. Various filters capable of capturing bacteria and viruses can be applied as the filter body 262.

The top cover 110 is formed with an exhaust port 111 (see FIG. 4). A flap 111a can be attached at the position of the exhaust port. The flap 111a is rotatably attached above the exhaust port 111. In other words, the flap 111a is attached so as to be able to open and close the exhaust port 111. When the air purifier 100 is not performing air purification operation, the flap 111a is in a rotated position (lying down) so as to cover the exhaust port 111, as shown in FIG. 2 and FIG. 3. This prevents dust and other particles from entering the exhaust port 111. On the other hand, when the air purifier 100 is performing air purification operation, the flap 111a is rotated upward by 90 degrees (standing up), exposing the exhaust port 111.

The top cover 110 is also provided with an operation unit 112. The operation unit 112 has operation buttons and a display unit. By operating the operation unit 112, the user can control the on/off and strength of the air purifier 100. The user can also check the operating status of the air purifier 100 by looking at the display unit of the operation unit 112.

<3> Filter Removal Structure Next, a filter removal structure will be described with reference to Fig. 3. Fig. 3 is a perspective view showing how each filter of the air purifier 100 is removed.

Of the prefilter 210, deodorizing filter 220, and dust collection filter 260, the prefilter 210 and deodorizing filter 220 are sandwiched between the rear cover 140 and the main body frame 180 when the rear cover 140 is engaged with the main body frame 180. In other words, as can be seen from FIG. 3, the prefilter 210 and deodorizing filter 220 can be removed in the Y direction indicated by the arrow y in the figure by removing the rear cover 140. Incidentally, in the example of FIG. 3, a filter pressing member 2111 is provided upstream of the prefilter 210.

In contrast, of the pre-filter 210, the deodorizing filter 220, and the dust collection filter 260, the dust collection filter 260 can be removed in the X direction indicated by the arrow x in FIG. 3. Specifically, an insertion port 151 into which the dust collection filter 260 can be inserted is formed in one of the two side covers 150, 160, and an insertion port 182 into which the dust collection filter 260 can be inserted is also formed in the side surface of the main body frame 180 opposite the insertion port 151, and the dust collection filter 260 can be inserted and removed from the air purifier 100 in the ±X directions indicated by the arrows x in the figure via these insertion ports 151, 182.

The side cover 150 shown in FIG. 3 is provided with a removable cover 152 for covering the insertion port 151 (omitted from FIG. 2). When the air purifier 100 is in operation, the cover 152 is attached to the side cover 150 to cover the insertion port 151. A gasket is provided on the inside of the cover 152 to fit tightly against the contact area with the side cover 150, thereby increasing the degree of airtightness provided by the cover 152. On the other hand, when replacing the dust collection filter 260, the cover 152 is removed from the side cover 150, and the dust collection filter 260 is pulled out from the insertion port 151.

A handle 263 is formed on the side of the frame 261 of the dust collection filter 260. This allows the user to easily remove the dust collection filter 260 from the air purifier body by pinching the handle 263 with their fingers. In addition, because the handle 263 is provided on the outer surface side of the frame 261, bacteria and viruses hardly adhere thereto, so the dust collection filter 260 can be removed without bacteria or viruses adhering to the user's hands.

In this way, in the air purifier 100 of this embodiment, the dust collection filter 260, which is located at the very back of the device body, can be removed separately from the pre-filter 210 and deodorizing filter 220, which are located in front of it, improving the maintainability of the filters.

<4> Duct Mounting Structure Next, the duct mounting structure of the air purifier 100 according to the present embodiment will be described with reference to Figs.

The air purifier 100 of this embodiment can be used either with the duct 13 attached or without the duct 13 attached. The state in which the air purifier 100 is used with the duct 13 attached is the state in which the air purifier is installed and used inside the medical booth 10 as shown in FIG. 1. In this state, the inside of the medical booth 10 can be made negative pressure as described above. On the other hand, the state in which the air purifier 10 is used without the duct 13 attached is the state in which the air purifier is placed and used in a space other than a negative pressure booth.

Figure 4 is a perspective view showing the state of the air purifier 100 when used without the duct 13 attached (i.e., when used outside a negative pressure booth). An exhaust port cover 113 is attached to the exhaust port 111 of the air purifier 100 (note that in Figure 4, the flap 111a shown in Figures 2 and 3 has been omitted to simplify the drawing). The exhaust port cover 113 can be easily attached to and detached from the top cover 110 by engaging the engagement claws and engagement holes. Figure 5 is a perspective view showing the exhaust port cover 113 removed from the top cover 110.

Figures 6 and 7 are perspective views showing the state of the air purifier 100 when the duct 13 is attached for use (i.e., when used in a negative pressure booth). An attachment 300 is attached to the top cover 110 so as to cover the exhaust port 111.

The attachment 300 has a base part 301 that covers the exhaust port 111, and a cylindrical duct mounting part 302 that extends upward from the base part 301. The outer size of the duct mounting part 302 is slightly smaller than the duct 13, so that the duct 13 is attached so as to fit closely to the outer peripheral surface of the duct mounting part 302. The air coming out of the exhaust port 111 is exhausted to the outside of the medical booth 10 via the base part 301, the duct mounting part 302, and the duct 13.

In this way, the air purifier 100 of this embodiment can be selectively equipped with the exhaust port cover 113 and the attachment 300 to which the duct 13 can be attached, so it can be used either in a place other than a negative pressure booth (medical booth 10) or as a step-down device in a negative pressure booth (medical booth 10). As a result, a highly versatile air purifier 100 can be realized.

A flange 301a is formed on the base portion 301 of the attachment 300. In addition, an engagement claw 301b is formed on the wall portion of the base portion 301 opposite the wall portion on which the flange 301a is formed.

Figure 8 is an oblique view showing the detailed configuration of the top cover 110, and Figure 9 is an oblique view explaining the relationship between the top cover 110 and the attachment 300.

The top cover 110 is formed with a recess 114 as a fitting portion into which the flange 301a of the base portion 301 fits, and also with an engagement hole 115 into which the engagement claw 301b of the base portion 301 engages. The depth of the recess 114 is approximately the same as the thickness of the flange 301a.

As a result, when the attachment 300 is placed near the exhaust port 111 of the top cover 110, the flange 301a fits into the recess 114, and the engagement claw 301b engages with the engagement hole 115, positioning the attachment 300 at a predetermined position on the top cover 110. At this time, the internal space of the attachment 300 is sealed from the outside.

In this state, the top cover 110 and the flange 301a are fastened together by screwing the screws 116 into the recesses 114 and the screw holes 116a drilled in the flange 301a. As a result, the attachment 300 is fixed in a predetermined position on the top cover 110.

This configuration allows the duct attachment 300 to be easily and reliably attached to the air purifier body, resulting in an air purifier 100 that is highly versatile and reliable.

Furthermore, as can be seen from FIG. 9, the base portion 301 accommodates the flap 111a and is higher than the height of the flap 111a in the upright state. This allows the flap 111a to be in the upright state inside the base portion 301 without colliding with the inner wall of the base portion 301, so that the attachment 300 does not impede exhaust.

When the air purifier 100 is not operating, the flap 111a is in a lying state covering the exhaust port 111 as shown in Figures 2 and 3, whereas when the air purifier 100 is operating, the flap 111a is in an upright state opening the exhaust port 111 as shown in Figure 9. The attachment 300 of this embodiment does not prevent the flap 111a from being in an upright state, so exhaust is not hindered.

<5> Dust Collection Filter Next, the configuration of the dust collection filter 260 of the present embodiment will be described with reference to FIG.

Figure 10 is a diagram showing the shape of the pleats of the dust collection filter 260 of the embodiment. Specifically, Figure 10 is a schematic top view of the filter body 262 of the dust collection filter 260. The filter body 262 has pleats. This allows the surface area to be increased, thereby reducing pressure loss in the air flow.

In this embodiment, the pleats have short pleats 262a that are folded back in the direction of the air flow (-Y direction) for a short length, and long pleats 262b that are folded back in the direction of the air flow (-Y direction) for a longer length than the short pleats 262a, and the long pleats 262b protrude downstream of the air flow more than the short pleats 262a.

It is also preferable that the long pleats 262b are formed at a predetermined interval in the pleat arrangement direction (±X direction).

By adopting this type of pleat shape, it is possible to straighten the air flow downstream of the dust collection filter 260.

Incidentally, to pass air through the dust collection filter, a fan must be used to either blow air in or pull it in, and the noise caused by this fan is a major cause of the noise made by air purifiers. If a typical pleated shape like that shown in Figure 11 is used, turbulence occurs when the air enters the fan, reducing the efficiency of ventilation, so it is necessary to rotate the fan at a higher speed to increase the air volume. As a result, increasing the fan rotation speed leads to increased noise.

The pleat shape of this embodiment as shown in FIG. 10 makes it difficult for turbulence to occur when air flows into the fan (sirocco fan 172 in this embodiment), and reduces the decrease in ventilation efficiency. Therefore, there is no need to rotate the fan at high speed to increase the air volume, so there is no increase in noise.

In this embodiment, the pleats have a straightening function, so noise can be suppressed without adding parts such as straightening plates.

<6> Configuration of the ultraviolet ray irradiation unit Next, the configuration of the ultraviolet ray irradiation unit will be described with reference to Fig. 12 and Fig. 13. Fig. 12 and Fig. 13 are schematic top views showing the relationship between the filter body 262 of the dust collection filter 260 and the ultraviolet ray lamp 240 as the ultraviolet ray irradiation unit. As described above, in the example of the embodiment, the filter body 262 of the dust collection filter 260 has short pleats and long pleats, but Fig. 12 and Fig. 13 show an example in which the filter body 262 has only short pleats in order to simplify the drawings.

In this embodiment, a plurality of ultraviolet lamps 240 that irradiate ultraviolet light onto the upstream surface of the filter body 262 are provided on the upstream side of the filter body 262. Here, the plurality of ultraviolet lamps 240 are arranged along the pleat arrangement direction (±X direction).

In this way, by arranging the ultraviolet lamp 240 upstream of the dust collection filter 260, ultraviolet light is irradiated onto the upstream surface of the dust collection filter 260, where a large amount of bacteria and viruses are attached, thereby improving the efficiency of inactivating bacteria and viruses.

In addition, by arranging multiple ultraviolet lamps 240 along the pleat arrangement direction (±X direction), the probability that ultraviolet light will reach the back of the pleats can be increased, further improving the efficiency of inactivating bacteria and viruses.

Here, when the dust collection filter 260 is inactivated using ultraviolet light, the efficiency of inactivation is determined by how much and how much ultraviolet light is irradiated onto the dust collection filter 260. Although a method using ultraviolet LEDs is also conceivable, ultraviolet LEDs have a lower output than ultraviolet lamps, making it difficult to achieve a sufficient inactivation effect. Taking this into consideration, in this embodiment, the inactivation effect is enhanced by using a high-output ultraviolet lamp 240.

However, even if the ultraviolet lamp 240 is used, as shown in the comparative example in Figure 14, if the ultraviolet light from the ultraviolet lamp 240 does not reach the back of the pleats, the inactivation effect of the ultraviolet light cannot be obtained sufficiently.

Therefore, in this embodiment, multiple ultraviolet lamps 240 are arranged along the pleat arrangement direction (±X direction). This makes the angle from the light-emitting part of the ultraviolet lamp 240 to the pleats an acute angle, allowing the ultraviolet light to reach deeper into the pleats.

Also, as shown in FIG. 13, if a light shielding plate 230 is provided upstream of the ultraviolet lamp 240 and the surface of this light shielding plate 230 facing the dust collection filter 260 (filter body 262) is made into a mirror state, ultraviolet rays can be generated at a different angle than direct light, and ultraviolet rays can be irradiated to the back of the pleats over a wider range of pleats. Note that a mirror state means a state with high reflectivity, and can be realized, for example, by using a material with high reflectivity or by performing mirror processing.

Furthermore, as shown in FIG. 13, by folding the light shielding plate 230, it becomes possible to irradiate ultraviolet rays to the innermost part of the pleats over a wider range of pleats. Also, depending on the shape of the folding process, it is possible to concentrate the ultraviolet rays in the part where a lot of air passes through, thereby increasing the inactivation efficiency.

<7> Control of the Ultraviolet Irradiation Unit Next, the control of the ultraviolet irradiation unit (ultraviolet lamp 240) in this embodiment will be described.

As shown in the block diagram of FIG. 15, when a user operates the operation unit 112, an operation signal from the operation unit 112 is input to the control unit 400, and the control unit 400 controls the ultraviolet lamp 240 based on the operation signal.

For example, when the user operates the power on button of the operation unit 112, the control unit 400 rotates the fan motor 171 and causes the ultraviolet lamp 240 to emit light. On the other hand, when the user operates the power off button of the operation unit 112, the control unit 400 basically stops the rotation of the fan motor 171 and causes the ultraviolet lamp 240 to stop emitting light.

However, in this embodiment, the control unit 400 continues to irradiate ultraviolet light from the ultraviolet lamp 240 for a predetermined period of time even after the operation unit 112 accepts a power-off operation. In other words, the control unit 400 continues to cause the ultraviolet lamp 240 to emit light for a predetermined period of time even after the rotation of the fan motor 171 is stopped. The control unit 400 causes the ultraviolet lamp 240 to stop emitting light after the predetermined period of time (e.g., 30 minutes).

This makes it possible to more reliably inactivate bacteria and viruses adhering to the dust collection filter 260. In other words, since bacteria and viruses adhere to the dust collection filter 260 while the fan motor 171 is rotating, if the ultraviolet lamp 240 is turned off at the same time as the fan motor 171, there is a high possibility that the bacteria and viruses that adhered immediately before the turning off of the ultraviolet lamp 240 will not be sufficiently inactivated by the ultraviolet lamp 240. The control of this embodiment makes it possible to avoid such a situation.

The above-mentioned predetermined period is preferably determined based on the operating period or air flow rate of the air purifier 100 from when the power-on operation is received until when the power-off operation is received. For example, the longer the operating period or air flow rate, the more likely it is that there are bacteria or viruses adhering to the dust collection filter 260, so it is advisable to make the above-mentioned predetermined period longer.

In addition, when the fan 172 is stopped and ultraviolet light is being emitted from the ultraviolet light emitting section (ultraviolet lamp 240), it is preferable to display a message calling attention to this fact. This can prevent the user from accidentally opening the cover to replace the filter, etc., while ultraviolet light is being emitted.

Furthermore, when the fan 172 is stopped and ultraviolet rays are being emitted from the ultraviolet ray irradiation section (ultraviolet ray lamp 240), it is preferable to lock the door (cover 152) for removing the dust collection filter 260. This can reliably prevent the user from accidentally opening the cover 152 while ultraviolet rays are being emitted.

<8> Summary As described above, the air purifier 100 of the present embodiment comprises a housing, a dust collecting filter 260 having a pleated shape disposed within the housing, a fan 172 that generates an air flow that passes through the dust collecting filter 260, and a plurality of ultraviolet lamps 240 that are disposed upstream of the dust collecting filter 260 and irradiate the upstream surface of the dust collecting filter 260 with ultraviolet light.

In addition, multiple ultraviolet lamps 240 are arranged along the pleat arrangement direction (±X direction).

As a result, ultraviolet light is irradiated onto the upstream surface of the dust collection filter 260, where bacteria and viruses are more likely to adhere, improving the inactivation effect of bacteria and viruses. In addition, since multiple ultraviolet lamps 240 are arranged along the pleat arrangement direction (±X direction), it is possible to increase the probability that ultraviolet light is irradiated deep into the pleats, further improving the inactivation effect of bacteria and viruses.

A light shielding plate 230 is provided upstream of the ultraviolet lamp 240, and the surface of the light shielding plate 230 facing the dust collection filter 260 is mirror-finished.

This allows ultraviolet light to be produced at a different angle than the direct light from the ultraviolet lamp 240, allowing ultraviolet light to be irradiated all the way to the back of the pleats over a wider range of pleats.

The light shielding plate 230 also has a bent shape.

This allows ultraviolet light to reach the back of a wider range of pleats. The folded shape also allows the ultraviolet light to be concentrated in areas where a lot of air passes through, improving the inactivation effect.

The above-described embodiments are merely examples of the implementation of the present invention, and the technical scope of the present invention should not be interpreted in a limiting manner based on these. In other words, the present invention can be implemented in various forms without departing from its gist or main characteristics.

In the above embodiment, as shown in FIG. 13, the case has been described where the length of the light shielding plate 230 in the X direction is approximately the same as the length of the filter body 262 in the X direction. However, as shown in FIG. 16, the light shielding plate 230 may be divided into the same number as the number of ultraviolet lamps 240, and the size of each light shielding plate 230a, 230b in the X direction may be reduced to a size that can cover the back of each ultraviolet lamp 240. In this way, pressure loss due to the light shielding plates 230a, 230b can be suppressed.

In the above embodiment, the ultraviolet lamp 240 is used as the ultraviolet irradiation unit, but this is not limited, and an ultraviolet LED can also be used.

The air purifier disclosed herein is widely applicable to air purifiers that have pleated dust collection filters.

LIST OF SYMBOLS 10 Medical booth 11 Frame body 12 Partition body 13 Duct 100 Air purifier 110 Top cover 111 Exhaust port 111a Flap 112 Operation unit 113 Exhaust port cover 114 Recess 115 Engagement hole 116 Screw 116a Screw hole 120 Base 130 Front cover 140 Rear cover 150, 160 Side cover 151, 182 Insert port 152 Cover 170 Fan case 171 Fan motor 172 Sirocco fan 180 Main body frame 181 Opening 210 Pre-filter 220 Deodorizing filter 230, 230a, 230b Light shielding plate 240 Ultraviolet lamp 250 Metal case 260 Dust collection filter 261 Frame body 262 Filter body 262a Short pleats 262b Long pleats 263 Handle 300 Attachment 301 Base portion 301a Flange 302 Duct mounting portion 400 Control portion

Claims (4)

A housing and
A dust collecting filter having a pleated shape and disposed in the housing;
A fan that generates an airflow passing through the dust collecting filter;
a plurality of ultraviolet lamps provided upstream of the dust collecting filter and configured to irradiate an upstream surface of the dust collecting filter with ultraviolet light;
An air purifier equipped with: The plurality of ultraviolet lamps are arranged along the arrangement direction of the pleats.
2. The air purifier according to claim 1. A light-shielding plate is provided upstream of the ultraviolet lamp, and the surface of the light-shielding plate facing the dust-collecting filter is made into a mirror state.
2. The air purifier according to claim 1. The light shielding plate has a bent shape.
4. The air purifier according to claim 3.

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