JPH05245320A - Air purifier - Google Patents

Abstract

PURPOSE:To enhance the collection performance and the collection efficiency of an air cleaner and to simplify handling of a filter by keeping the wind velocity of air passing through the filter at optimum velocity, enlarging the distribution range while keeping uniformity of the distribution of wind velocity thereof and increasing the effective area of the filter. CONSTITUTION:A filter 7 is constituted of an electrostatic filter 10 and opposed to the suction port 5 of a fan and arranged in the upstream part of the suction of the fan. The downstream part of the filter 7 becomes the space part 8 for suction of the fan and the upstream part thereof becomes the space part 13 for suction of the filter by holding the filter 7 between the space part 8 and the space part 13. The region opposed to the suction port 5 of the fan in the space part 13 for suction of the filter is covered with a covering body 12. The filter 7 is entanglad in a roll shape and drawn out from an entangling part 7a and used.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an air purifying apparatus for purifying dirt in a gas, and more particularly to an air purifying apparatus of the type in which gas is forced to pass through a filter associated with a purifying element.

[0002]

2. Description of the Related Art In an air purifier, a structure in which a filter is provided upstream of a blower fan so as to face a fan suction port is
Known from the past.

There are various kinds of collecting principles of the filter, and examples thereof include a sieving effect for fine particles, a collision effect, an adsorption by fine pores, or an electrostatic attraction.

[0004]

Of these, particularly, an electrostatic filter for electrostatically charging the material of the filter itself and collecting fine dust by utilizing the electrostatic attraction is also called an electrostatic filter. In some cases), or in an activator filter that removes an extremely dilute gas body by adsorption, it is desirable that the wind velocity of the gas passing through the filter be in an appropriate range. The appropriate wind speed is an economic speed within a range that does not impair the collection performance and does not damage the filter.

Further, the collection efficiency depends on how to increase the effective area effective for the actual collecting action, that is, to increase the air flow distribution passing through the filter, with respect to the total area of the filter. It is required to raise the cost, to reduce the cost, and to reduce the size of the purification device.

Here, the reason why the gas passing through the electrostatic filter or the activator filter is required to have a uniform wind velocity distribution, particularly at an appropriate wind velocity, will be described.

In the case of collecting a single layer or a plurality of layers of non-woven fabric, which has been widely used in the past, by a simple mechanical sieving effect or a collision effect, even if the wind velocity distribution is initially uneven,
As the wind speed is high, clogging occurs early in the use, and as a result, the wind speed distribution gradually becomes uniform, so that the non-uniform wind speed does not become an obstacle.

On the other hand, in the electrostatic filter and the activator filter, the portion where the wind velocity is high is likely to be saturated in terms of performance.

This saturation phenomenon is due to the disappearance of electric charges due to the adhesion of dust and the weakening of the odor adsorption effect, and is not due to the aforementioned clogging phenomenon. Therefore, it is not possible to correct the non-uniformity of the wind velocity distribution (the mechanism of the electrostatic filter is described in detail in the embodiment section).

As a result, the portion where the wind velocity is high saturates faster than other portions in terms of performance and becomes a blow-through portion that does not have a purifying action, which causes a problem that the trapping performance of the entire filter is deteriorated.

However, in the conventional air purification device,
Consideration was not enough to pass the gas through the filter at a uniform and appropriate speed and to increase the filter effective area (air distribution through the filter).

The main cause of the non-uniform wind speed distribution of the gas passing through the filter is that the fan suction port area is smaller than the filter area, and the maximum wind speed is at the area facing the fan suction port. It can be mentioned that a deflected flow occurs.

The fan suction area is smaller than the filter area as follows.

First, the fan suction port has a round shape, and it is advantageous to cut the filter into square pieces at the time of manufacture because it is advantageous in terms of material handling. The round shape existing in the square shape naturally has a small area. ..

Secondly, the filter has a ventilation resistance,
In order to obtain a fan suction force that overcomes this, the fan motor becomes larger, but from the viewpoint of economic design, it is often advantageous to reduce the ventilation resistance of the filter. The area is increased and the fan suction area is smaller than the filter area.

Therefore, as shown in the prior art example of FIG. 5 which will be described later, the ratio of the suction area S _{1 of} the fan to the filter area S ₂ of S ₁ /
S ₂ is about 0.1 to 0.9.

There is also a demand for reducing the thickness of the product as small as possible from the fan suction port to the filter surface.

Then, as shown in FIG. 5, when the distance L ₁ from the fan suction port to the filter surface is set so that the dimension ratio L ₁ / D ₁ is 1 or less with respect to the fan suction port diameter D ₁ ,
Due to the relationship of S ₁ / S ₂ ≈0.1 to 0.9, a biased wind speed distribution that maximizes the wind speed in the area portion facing the fan inlet is generated.

As a way of thinking for correcting the unevenness of the wind velocity distribution as described above, there has been proposed a method of setting the ventilation resistance of the filter so that it becomes smaller as it goes away from the portion facing the fan suction port. (This method is known as a filter for a range hood.) In practice, changing the air flow resistance of a single filter during the manufacturing process leads to high cost, and there is a difficulty in putting it to practical use.

That is, since the filter is usually of a disposable type in which it is discarded, then discarded, and replaced with a new one, it is desirable that the filter unit has a structure that is cheap and suitable for mass production.

Further, conventionally, when the function of the filter deteriorates, a new filter must be obtained each time, and it takes time and effort for replacement.

The present invention has been made in view of the above points, and an object thereof is to keep the wind speed of gas passing through a filter at an optimum speed with a simple structure and to maintain the uniformity of the wind speed distribution. At the same time, the distribution range is expanded to increase the effective area of the filter, to improve the collection performance and collection efficiency of this type of air purification device, and to facilitate the handling of the filter.

[0023]

The present invention is configured as follows in order to achieve the above object.

The contents of the present invention will be described below with reference to the reference numerals of the embodiment of FIG. 1 in order to facilitate the understanding thereof.

That is, according to the present invention, the filter 7 is arranged upstream of the blower fan 2 so as to face the fan suction port 5, and the fan suction space 8 is formed between the fan suction port 5 and the filter 7. In addition, the cover body 12 is arranged upstream of the filter 7 and apart from the filter surface, and the filter suction space 13 is provided between the filter 7 and the cover body 12.
The cover 12 has a structure that covers a space area of the filter suction space 13 facing the front of the fan suction opening 5 across the filter over the entire area or most of the space. Around the area covering the area,
The air inlet 14 (14 which communicates with the filter suction space 13)
a, 14b), and the filter 7 is composed of an electrostatic filter 10 or a combination of two or more kinds of filters including the electrostatic filter 10, and the filter 7 is rolled into a roll shape and is attached to the purifying apparatus main body 1. It is equipped, and a part of it is pulled out from the winding portion 7a and set between the fan suction space portion 8 and the filter suction space portion 13.

The air inlet 14 is, for example, the cover 1
2 is also used as a decorative panel, directly on this cover 12,
Although the openings 14a and 14b may be formed to form the cover, instead of this, the cover 12 may be arranged separately from the decorative panel.

A gap may be secured between the peripheral edge of the cover 12 and the peripheral edge of the filter 7 to serve as an air inlet. When the air inlet 14 is divided vertically and horizontally into 14a and 14b, only one of them may be adopted.

[0028]

With the above structure, the filter suction space portion 13
The entire area of the space area facing the fan suction port 5 or most of the space area is covered with the cover 12. In the figure, the cover 1
The central portion of 2 covers the space area facing the fan suction port 5. Therefore, when the fan is driven, air flows into the filter suction space 13 from the air inlet 14 located outside the covered area.

Then, the filter suction space portion 13 at this time
The distribution of the air flow passing through the filter 7 and the filter 7 extends to most of the filter 7 from the positional relationship between the cover 12 and the air inlet 14 as shown by the hatched portion in FIG.

This air flow distribution (c) is represented by a solid line shown in (c) of FIG. 6 as an example of the wind speed distribution, and the wind speed is also uniformed over most of the filter while maintaining the optimum speed. (In the experimental data of FIG. 6, the economic speed, which is the optimum wind speed, has an upper limit of 0.8 m / sec and a lower limit, for example.
0.3m / sec) As described above, the reason why the substantially uniform optimum wind speed is maintained over the wide area of the filter is that the air inlet 14 is set at a position outside the area where the fan suction port 5 is opposed to the air inlet 14. Is spread evenly over the filter suction space portion 13. That is, in this way, it is possible to prevent the occurrence of a locally deflected flow (concentrated flow).

Since the electrostatic filter 10 is used as the filter 7, the wind velocity distribution passing through the filter is made uniform over a wide area, resulting in a local deflection flow which is a problem peculiar to the electrostatic filter. Prevent local wipe.

By the way, since the air flow of the conventional air purifier produces a deflected flow in the vicinity of the center of the filter 7A (the portion facing the fan suction port 5A) as shown by the hatched line in FIG. As shown by the dotted line in FIG. 6D, the maximum wind speed occurs in the portion of the filter that faces the fan inlet, and the maximum wind speed also exceeds the economic wind speed.

Further, in the present invention, when the function of the filter 7 (electrostatic filter 10) between the fan suction space 8 and the filter suction space 13 is deteriorated, a new filter is taken in to replace it. It is pulled out from the portion 7a and set. In this case, the consumed filter may be disposed by either the winding method or the cutting method.

[0034]

Embodiments of the present invention will be described with reference to the drawings.

FIG. 1 is a sectional view of an air purifying apparatus according to an embodiment of the present invention, FIG. 2A is a front view of an electrostatic filter used in this embodiment, and FIG. Cross section side view,
FIG. 3 is a schematic front view showing an example of the cover used in this embodiment.

In the figure, reference numeral 1 is a box-shaped main body in which a blower fan 2 and an electric motor 3 are incorporated. Fan 2
A centrifugal fan is used as an example.

A fan cover 4 has a fan inlet 5 formed in the center thereof, and a filter support frame 6 and a filter receiving member 15 are arranged in a protruding manner on the front surface (upstream side) of the cover.

The filter 7 is composed of an electrostatic filter 10 such as a non-woven fabric or a fiber for collecting fine dust, and an activated carbon filter 11 for adsorbing molecular gas, odor, etc. in the pores of the activated carbon fiber. It is composed of two layers of filter elements and is installed in the apparatus main body 1 in a state of being rolled up.
Reference numeral 7a indicates the winding portion, and 7b is the winding portion.
The winding portion 7a and the winding portion 7b are a fan suction space portion 8 described later.
The filter 7 is arranged on both right and left sides of the filter suction space 13, and a part of the filter 7 is pulled out from the winding portion 7a and set between the fan suction space 8 and the filter suction space 13.

The filter 7 may be marked so as to be wound for each unit of use, or the winding portion 7b may be omitted and only the winding portion 7a may be provided. In the latter case, the filter 7 can be cut into individual units.

The filter 7 drawn out from the winding portion 7a is
It is arranged on the filter support frame 6 upstream of the fan 2 so as to face the fan suction port 5. A fan suction space 8 is formed between the filter 7 and the fan suction port 5 including the fan cover 4. Reference numeral 9 is a discharge port arranged on the fan downstream side of the main body 1.

Both the electrostatic filter 10 and the activated carbon filter 11, which are the filter elements, are saturable filters.
Here, the saturable filter is a generic term for filters having a property that the dust adhering ability and the odor adsorbing ability are saturated with use.

That is, the electrostatic filter 10 electrostatically charges the fiber itself, which will be the filter, by high voltage charging during the process of manufacturing the filter, as will be described later in detail, and utilizes this electrostatic attraction force. Although the dust is removed by electric force, the amount of electrostatic charges on the fibers is gradually reduced due to the adhesion of dust, and the dust collecting capability is saturated.

Further, in the activated carbon filter 11, when the odorous components such as gas are adsorbed in the fibers, the adsorption capacity is saturated.

Here, the specific structure of the electrostatic filter 10 will be described in detail.

The electrostatic filter 10 shown in FIG. 2 is a vertical cross-sectional view showing one of the units used, and the electret filter 17 described later is covered with a bag-shaped nonwoven fabric 18 to form a plurality of layers, and the end portions 19 thereof are heat-sealed. The electrostatic filter 10 is continuously connected and wound into a roll. The end portion 19 is provided with a plurality of filter fixing holes 20.

The electrostatic filter 10 used in this embodiment is
The following electret phenomenon is used.

The electret phenomenon shows the same phenomenon that the electric polarization is maintained by the mechanism of the material itself, and the material is physically charged to have an electric charge inside.

That is, the dust in the air is usually positively or negatively charged, and when these particles pass through the filter, they are electrostatically attracted by the electric charge inside the filter medium and collected in the filter medium. ..

As the filter medium material, synthetic fibers or inorganic substances such as polyethylene, Teflon, and polypropylene having a large electric resistivity are selected.

A method of making an electret can be obtained by warming the above-mentioned dielectric material to the softening point and cooling it while applying a high DC voltage thereto. Alternatively, it can be obtained by corona discharge on the surface of the dielectric.

In this way, the electrostatic filter that is made into a filter can obtain a high collection efficiency without using a high-voltage power source in the body. However, since the amount of electric charge at the time of manufacture is limited, when dust adheres and reaches a certain amount of dust, the filter performance reaches a saturation point and the collection performance deteriorates.

At this point, in order to prevent the deterioration of the collection performance and to prolong the life, the wind velocity passing through the filter is set to the optimum velocity (economical velocity), and the wind velocity distribution is made uniform and expanded. It is necessary to prevent partial saturation of the filter performance and achieve blow through.

In this embodiment, the following means are taken to solve the above problems.

That is, the cover 12 is arranged upstream of the filter 7 so as to face the filter 7 away from the filter surface.

The cover body 12 of the present embodiment has a rectangular panel shape facing the entire surface of the filter 7 (hereinafter, the cover body 12 is referred to as a panel), and a filter suction member is provided between the panel 12 and the filter 7. The space portion 13 is formed.

The central area of the panel 12 covers the entire area of the filter suction space 13 in which the fan suction port 5 faces the space. In other words, as shown in FIG. 4, the area S ₃ of the central region of the panel 12 is made larger than the area S _{1 of} the fan suction port 5, so that the fan suction port 5
At least most of the portion which is the projected portion of the fan suction port 5 on the suction streamline is covered.

Further, around the central region of the panel 12,
As shown in FIG. 3, openings 14 serving as air inlets are provided on the left and right sides and the upper and lower sides thereof.

A filter retainer 16 is arranged around the air inlet 14, and the filter retainer 16 and the panel support frame 6 hold the filter 7 between them.

In this embodiment, as shown in FIG. 4, the diameter of the fan inlet 5 is D ₁ , the distance between the front face of the fan inlet 5 and the filter 7 is L ₁ , and the distance between the filter 7 and the panel 12 is L ₁ . L _2, the area of S ₁ of the fan suction port 5, the area of S ₂ files 7, the area of the central region (covering portion) of the panel 12 when the _{S 3, D 1 = 10cm,} L 1 = 3cm, L 2 = 3 cm,
S ₁ ≈ 80 cm ² , S ₂ = length 25 cm x width 30 cm (750 cm ² ),
The size is set to S ₃ = 15 cm × 15 cm (225 cm ² ).

With the above structure, when the fan is driven, air flows into the air inlet 14 and the filter suction space 13, and then the filter 7, the fan suction space 8, the fan suction port 5, the fan 4 and the discharge port. It is discharged to the outside of the vessel via 9.

The flow of this air is shown in FIG.

FIG. 5 shows a conventional example shown for comparison with the present invention. In front of the fan suction port 5A of the fan cover 4A,
FIG. 11 is a cross-sectional view of a main part showing the flow of air in a conventional purification device in which a filter 7A is attached to a filter support frame 6A and the front side of the filter 7A is completely opened.

In FIGS. 4 and 5, the hatched portions (c) and (d) indicate the gas flow.

It should be noted that FIG. 4 does not show the abutting portions on both sides of the panel 12, and the filter 7A of FIG. 5 uses a mere non-woven fabric of mechanical filtration.

In the present embodiment, as described in [Operation] of the invention, due to the presence of the panel 12 and the positional relationship of the openings 14 and the like, as shown in FIG.
Of air flows over most of the filter 7. On the other hand, in the conventional example of FIG. 5, a deflected flow of the air flow in the center of the filter 7A occurs. Further, when it is deviated from the center, there is a region where almost no air flows in the filter 7A.

FIG. 6 is a comparative explanatory view showing the difference between the two in terms of the wind speed distribution.

The solid line in (c) of FIG. 6 shows the wind velocity distribution in the state of FIG. 4 of this embodiment, and the dotted line of (d) shows the wind velocity distribution in the state of FIG. 5 according to the conventional example.

That is, in the present embodiment, the difference between the maximum and minimum wind velocities is almost the same as B ₂ as shown in (c) over almost the entire filter width, the wind velocities are made uniform, and the economic wind velocity of the filter is Can be set to an appropriate value.

On the other hand, in the wind velocity distribution shown in (d), a concentrated flow occurs in the central region of the filter as indicated by B ₁ , and the blow-by is likely to occur due to the local life of the filter.

As described above, according to the present embodiment, a large effective area contributing to the collecting action can be taken out of the total area of the filter, and a high collecting efficiency can be obtained.

FIG. 7 is a graph showing changes in operating time and filter performance.
FIG. 7 is a comparative explanatory view of the present embodiment shown in FIG. 4 and the conventional example shown in FIG. 55. The solid line shown in (c) of FIG. 7 is the present embodiment, and the dotted line of (d) is the conventional example. 3 is a filter performance change characteristic diagram according to FIG.

As shown in FIG. 7, the filter performance becomes saturated with the progress of operation and becomes a damping characteristic. However, in this embodiment, as described above, the effective area ratio with respect to the total area of the filter is increased, so that long operation is performed. Can be used in time.

This will be described in detail with reference to FIG. 6, which is the lower limit of the economic wind speed that does not damage the filter.
Compared to the conventional example (the left and right hem portions) used at 0.3 m / sec or less, in this embodiment, that portion is used within the economical speed range, so that the effective area ratio is about 3
Increase by 0%. As a result, it can be used for about 30% longer in operation time. The upper limit of economic wind speed is, for example, about 0.8 m / sec.

As described above, according to this embodiment, the following effects can be obtained.

(1) High trapping performance can be obtained by uniformizing and optimizing the wind speed.

(2) The ratio of the effective area to the total area of the filter is large, a concentrated flow is not generated, and the collection efficiency of the filter is improved, so that the filter life can be extended.

(3) By increasing the filter effective area as described in (2) above, the filter can be arranged close to the fan suction port, and the device can be made thinner and smaller.

(4) The air inlet to the filter becomes the peripheral portion of the panel, which can be taken in the most desirable direction in terms of the function of the device.

(5) The provision of the panel covers the filter, which is easily contaminated, on the appearance, so that the user does not feel uncomfortable and the operating noise can be reduced.

(6) Since a filter wound in a roll shape is provided, if the function of the currently used filter part deteriorates, if the unused part is wound up and an unused one is pulled out from the winding part, a new filter is used again. Therefore, it is possible to save the trouble of replacement by obtaining a new filter and to simplify the handling.

In the case of the rectangular panel shown in the drawing, the air inflow openings 14 arranged in the panel 12 in this embodiment must be secured in at least two left and right directions, but it is difficult to obtain a uniform filter wind velocity distribution. , This panel 12
Alternatively, the filter 7 and the like are not limited to the rectangular shape, and the same effect can be obtained by using a circular shape, an elliptical shape, or the like.

The filter may be either an electrostatic filter or an activated carbon filter.

FIG. 8 is a perspective view of a main part of a fan suction cover according to another embodiment of the present invention.

4a is a fan cover, 5a is a fan inlet, 6a is a filter support frame, 15a is a filter receiving material,
6a is a filter end receiving material.

That is, the filter receiving material 15a is provided around the fan suction port 5a so as to radially protrude toward the arrangement side of the filter 7, and the filter support frame 6a is provided with the filter end receiving material 16a.

According to this structure, the filter receiving member 1
5a, in cooperation with the filter end receiving member 16a and the filter support portion 6a, prevents the filter 7 from being drawn to the fan suction port 5a, and can reliably hold the fan suction space portion 8.

Therefore, even if the filter material is a flexible structure, by always holding the fan suction space 8 which is always required, the manufacture of the filter can be simplified and the cost can be reduced.

FIG. 9 is a perspective view of a fan cover portion according to still another embodiment.

In this embodiment, the fan cover used in the apparatus shown in FIG. 1 is constructed as follows.

In FIG. 9, 4b is a fan cover and 5b.
Is a fan suction port, and 15b is a filter receiving material.

That is, around the fan suction port 5b, the suction swirling flow of the fan and the direction thereof are aligned to provide the curved filter receiving member 15b. Of course, in addition to the same effect as that of the above-described embodiment, a more desirable flow guiding effect is achieved.

In addition, in what is shown in FIGS.
The filter support does not prevent it from being placed in one place.

10 and 11 are cross-sectional views of an air purifying apparatus according to another embodiment of the present invention.

In FIG. 10, the same reference numerals as those in FIG. 1 denote the same parts.

1-1 is a main body, 2-1 is an axial flow type blower fan, 4-1 is a fan cover, 5-1 is a fan suction port, 6
Reference numeral -1 is a filter support frame, and 12-1 is a panel.

In this embodiment, the blower fan 2-1 is of the axial flow type instead of the centrifugal fan. Such a device can also be used as an indoor circulator for air cleaning or a clean ventilator for ventilation.

In FIG. 11 as well, the same reference numerals as in FIG. 1 indicate the same parts, 1-2 is a main body, 4-2 is a fan cover, 6-2 is a filter support frame, 7-1 is a filter wound around a roll shaft, 7a filter winding section, 7b filter winding section, 12
-2 is a panel.

That is, in this embodiment, a roll-shaped filter 7-1 is made of a filter material having the same material composition as that of the previous filter 7. When the function of the currently used filter part deteriorates, it is wound up and newly added. A new filter part can be sent out, and the trouble of replacement by obtaining a new filter can be saved and a simple use is enabled.

In any of the above embodiments, the winding portion 7b is set in addition to the filter winding portion 7a, but the winding side can be omitted by discarding the used filter.

In addition to the electrostatic filter, it is also possible to use a combination of means for ionizing dust in the air passing through the filter upstream.

[0101]

As described above, according to the present invention, by devising the arrangement structure of the cover placed on the entire surface of the filter and the air inlet port communicating with the filter suction space, the air flow passing through the filter can be reduced. By making the air flow distribution uniform and increasing the distribution range (filter effective area) while maintaining the optimum wind speed, it is possible to improve the collection performance and collection efficiency of this type of air purification device. As a result, the life of the filter can be improved, and the above effects can be achieved with a simple and rational structure without complicating the structure of the filter.

Further, when the function of the currently used filter portion deteriorates, it can be wound up and the unused filter portion can be pulled out from the winding portion to be used, thus saving the trouble of replacement by obtaining a new filter. Enables easy use.

[Brief description of drawings]

FIG. 1 is a sectional view of an air purifying apparatus according to an embodiment of the present invention.

FIG. 2 is an explanatory view of an electrostatic filter used in the above embodiment.

FIG. 3 is a schematic front view of a panel used in the above embodiment.

FIG. 4 is an explanatory diagram showing a flow state of air during operation of the above embodiment.

FIG. 5 is a schematic cross-sectional view of a main part of an air purification device of a conventional example, showing the flow along with gas.

FIG. 6 is an explanatory view for comparing the filter wind speed distributions of the above-described embodiment and the conventional example.

FIG. 7 is an explanatory diagram comparing the operating time and the change in filter performance between the above-described embodiment and the conventional example.

FIG. 8 is a perspective view of a main part of a fan cover according to another embodiment of the present invention.

FIG. 9 is a perspective view of a main part of a fan cover according to another embodiment of the present invention.

FIG. 10 is a schematic cross-sectional view of an air purifying device according to another embodiment of the invention.

FIG. 11 is a schematic sectional view of an air purifying device according to another embodiment of the invention.

[Explanation of symbols]

1,1-1,1-2 ... main body, 2,2-1 ... blower fan,
4, 4a, 4b, 4-1, 4-2 ... Fan cover, 5,
5a, 5b, 5-1 ... Fan suction port, 6, 6a, 6-
1, 6-2 ... Filter support frame, 7, 7-1 ... Roll filter, 7a ... Filter winding section, 7b ... Filter winding section, 8 ... Fan suction space section, 10 ... Electrostatic filter, 11
... Activated carbon filter, 12, 12-1, 12-2 ... Cover (panel), 13 ... Filter suction space part, 14 (14
a, 14b) ... Air inflow port, 15, 15a, 15b ... Filter receiving material, 16 ... Filter retainer, 16a ... Filter end receiving material, 17 ... Electret filter, 18 ... Bag-shaped nonwoven fabric, 19 ... End portion.

Claims (2)

[Claims] 1. A structure in which a filter is arranged upstream of a blower fan so as to face a fan suction port, and a fan suction space is formed between the fan suction port and the filter. A cover body is arranged facing away from the filter surface to form a filter suction space portion between the filter and the cover body, and the cover body is a filter in front of the fan suction port in the filter suction space portion. A structure is provided that covers the entire space area or the majority of the space area that faces over, and an air inlet that communicates with the filter suction space portion is provided around the area that covers the space area that faces the fan suction port, and the filter is , An electrostatic filter or a combination of two or more types of filters including an electrostatic filter, and the filter is installed in the main body of the purifying device in a state of being rolled up. The air purifying device is configured such that a part thereof is pulled out from the winding portion and is set between the fan suction space portion and the filter suction space portion. 2. The air purifying apparatus according to claim 1, wherein the filter is a combination of an electrostatic filter and an active pair filter.