JP2001012778A - Local cleaning air cleaner - Google Patents

Abstract

PROBLEM TO BE SOLVED: To increase cleanliness of air within a specified range in front of an air outlet quickly while eliminating the feeling of draft. SOLUTION: The air cleaner comprises a easing 1 having an air inlet 1a made in the center of the back surface and a circular clean air outlet 1b made in the front surface substantially over the entire range thereof, a fan 4 rotatable through a fan motor 3 in the casing 1, a member 5 for controlling the air flow generated from the fan 4 while surrounding the fan motor 3, and a main filter 6 interposed between the clean air outlet 1b and the air flow control member 5. The air cleaner has a function for reducing the concentration of floating allergen to 30 pg/m3 or below in the center of supply air flow in a plane including a desired position within the range of 30 cm-150 cm from circular clean air outlet 1b when the concentration of floating allergen is 220 pg/m3 on the outside of supply air flow.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method of purifying a predetermined area in front of an air outlet (for example, a respiratory point of an allergic patient, etc.) by inhaling air from the outside and purifying the air, and blowing the purified air from the air outlet. (Localized air purifier) which can rapidly increase the cleanliness of the air.

[0002]

2. Description of the Related Art Conventionally, air purifiers have been widely used to purify indoor air. In particular, in homes with allergic patients, it is common to install an air purifier to purify indoor air.

[0003] However, air purifiers that have been widely used in the past are manufactured for the purpose of purifying indoor air, and thus operate efficiently when installed in, for example, a corner of a room. Thus, the outlet of the clean air is provided upward. When an air purifier having this configuration is adopted, it is considered that the effects of house dust, mite allergen (mite antibody), etc. on allergic patients can be significantly reduced by purifying indoor air.

[0004]

However, in practice, even when the air purifier having the above configuration is employed, the effects of house dust, mite allergen, etc. on allergic patients and the like are sufficiently reduced. Can not.

[0005] This point will be described in more detail.

In general, there are tatami mats, futons, and the like in a room where an allergic patient or the like is lying down. In particular, since the futons are the homes of mites, they contain a huge amount of mite allergens. Therefore, for example, house dust and mite allergens are scattered from the tatami mat by other people walking,
House dust, mite allergens, etc. are scattered when an allergic patient turns over, and house dust, mite allergens, etc. are also scattered by raising and lowering the futon. As a result, the amount of floating dust, floating allergens increases. Here, house dust and mite allergen as antigens are different, but mite allergen particles are also a kind of house dust, and mite allergens may be attached to house dust, and mite allergen particles The properties of particles such as floating, scattering and sedimentation are similar to those of house dust. Therefore, it is common that house dust and mite allergen float at the same time. When house dust, mite allergens and the like are scattered in this way, the indoor air is gradually purified according to the capability of the air purifier, so that the respiratory points of allergic patients and the like are sufficiently cleaned. It takes a remarkably long time to reach this point, and during this period, allergic symptoms and the like appear due to the mite allergen and the like, causing pain for allergic patients and the like.

Although the above description has been made for allergic patients and the like, similar inconveniences occur even for persons other than allergic patients as long as they are adversely affected by house dust, mite allergens and the like. .

[0008]

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned problems, and it is an object of the present invention to quickly increase the cleanliness of air in a predetermined area in front of an air outlet (a local area such as a respiratory point of an allergic patient). It is an object of the present invention to provide a locally purified air purifier that can be used.

[0009]

According to a first aspect of the present invention, there is provided a local cleaning type air purifier, wherein when a suspended mite allergen concentration out of a range of a blown air flow is 220 pg / m ³ , the air is 30 cm away from the air blowout port in the air blowing direction. Above and 150cm
In a plane including a position separated by the following predetermined distance,
The concentration of airborne allergens in the central part of
pg / m ³ or less.

According to a second aspect of the present invention, the operating sound level of the air purifier at a position separated from the air outlet by a predetermined distance of 30 cm or more and 150 cm or less in the air blowing direction is set to 35 dB or less. Things.

According to a third aspect of the present invention, there is provided a locally-cleaning type air purifier, comprising: a blown air corresponding to an air outlet in a plane including a position separated from the air outlet by a predetermined distance of 30 cm or more and 150 cm or less in an air blowing direction. The average wind speed of the blown air flow in the range is 0.15 to 0.35 m /
s.

According to a fourth aspect of the present invention, there is provided a locally-cleaning type air purifier, wherein a blown air stream is formed in a plane orthogonal to the air blow direction in a range of the blown air corresponding to the air blow port.
The wind speed is set to be 0.5 to 1.5 times the average wind speed in an area of 0% or more.

According to a fifth aspect of the present invention, there is provided the local cleaning type air purifier, wherein the concentration of the floating mite allergen out of the range of the blown air flow is 220.
at pg / m ^3, the balloon air flow, 30 pg / m ³
Hereinafter, the outer floating mite allergen concentration region is configured to have a size of 20 cm or more in a direction orthogonal to the air blowing direction.

According to a sixth aspect of the present invention, there is provided a locally purified air purifier employing a centrifugal fan as a blowing means for blowing clean air.

[0015]

According to the first aspect of the present invention, in purifying the air taken in from the air inlet and discharging it from the air outlet, the concentration of the floating mite allergen out of the range of the blown air flow is 220 pg /. At m ³ , the floating allergen concentration at the center of the blown air stream in a plane including a position separated by a predetermined distance of 30 cm or more and 150 cm or less from the air blowing port in the air blowing direction to 30 pg / m ³ or less. Because it has the ability to reduce, the respiratory point of an allergic patient or the like is quickly and sufficiently small within a range of almost the entire width of the bed without giving a feeling of discomfort such as oppression. be able to.

In the local cleaning type air purifier of the second aspect, the operating sound level of the air purifier in a plane including a position separated from the air outlet by a predetermined distance of 30 cm or more and 150 cm or less in the air blowing direction. 35 dB
Since it is set as follows, in addition to the function of claim 1,
You can lower the level of driving noise to increase comfort,
Consequently, it is possible to go to bed without worrying about the driving noise.

According to a third aspect of the present invention, there is provided a locally-cleaning type air purifier, wherein the air outlet corresponding to the air outlet in a plane including a position separated from the air outlet by a predetermined distance of 30 cm or more and 150 cm or less in the air blowing direction. The average wind speed of the blown air flow in the range of air is 0.15 to 0.5.
Since the speed is set to 35 m / s, in addition to the effect of claim 1 or claim 2, it is possible to prevent a draft from being felt.

According to the local cleaning type air purifier of the fourth aspect, the blown air stream has a wind speed in a region which is 70% or more of the range of the blown air corresponding to the air blowout port on a plane orthogonal to the air blowout direction. Average wind speed 0.5-1.
Since it is five times, in addition to the effect of any one of the first to third aspects, the wind speed distribution can be made substantially uniform.

According to the fifth aspect of the present invention, the region having a degree of contamination of 1/7 or less of the degree of contamination outside the blown air flow has a size of 20 cm or more in a direction orthogonal to the direction of air blowing. Therefore, in addition to the effect of any one of claims 1 to 4, it is possible to substantially cover the width of the face of an allergic patient or the like.

In the local cleaning type air purifier according to the sixth aspect, the blowing means for blowing out the clean air is a centrifugal type fan. Therefore, a large static pressure can be realized.

[0021]

Embodiments of the present invention will be described below in detail with reference to the accompanying drawings.

FIG. 1 is a central longitudinal sectional view showing an embodiment of the local cleaning type air purifier of the present invention, and FIG. 2 is a front view showing a side of a clean air outlet.

This locally-cleaning type air cleaner 10 has an air inlet 1a at the center of the rear surface and a clean air outlet 1b over substantially the entire front surface.
And a pre-filter (for example, a filter that removes only large-diameter dust particles) 2 provided on the back surface of the casing 1 so as to cover the air suction port 1a, and is illustrated inside the casing 1 in front of the air suction port 1a. A fan motor 3 provided via a support member not provided, a fan 4 provided between the fan motor 3 and the air suction port 1a, and rotated by the fan motor 3, and a whole outer periphery of the fan 4 Cylindrical wall member 5 surrounding at a predetermined distance
A main filter (a filter having a high air purification capacity) 6 supported in a rectangular space of the casing 1 in front of the opening of the cylindrical wall member 5 by a predetermined distance, and a front grill provided in the clean air outlet 1b. 7, a photocatalyst layer 8 provided on the end face of the main filter 6 on the upstream side of the air flow, and a light containing ultraviolet light provided at a predetermined position on the upstream side of the air flow from the photocatalyst layer 8. And a light source 9 for irradiation. The fan 4 is a centrifugal fan such as a turbo fan or a sirocco fan. This is because a filter having a high collection efficiency is used as the main filter 6, so that a large static pressure is required for the air volume, and this requirement is satisfied. One end of the cylindrical wall member 5 is closed leaving a fan suction space at the center, and the other end is an opening for blowing air. In addition, fan motor 3
Cover also serves as a diffuser inside the air passage. The photocatalyst layer 8 supports a metal oxide having a photocatalytic action. A dirt prevention cover 9 is provided at a predetermined position of the light source 9 near the upstream side of the air flow.
a is provided.

It is preferable to provide a diffuser for reducing the flow of the air blown by the fan 4 to recover the dynamic pressure and for making the blow air velocity distribution uniform. Further, it is preferable to provide a stationary blade having a shape for removing a swirling speed component of the blowout flow by the fan 4 in the blowout flow path. Furthermore, a resistor is disposed at the outlet to make the wind speed distribution of the clean air outlet 1b uniform, or the resistance of the resistor is changed depending on the location to control the outlet wind speed distribution. Is preferred. In addition, it is preferable to provide a sound absorbing material on the wall surface of the outlet channel to reduce operation noise.

However, as a locally purified air purifier,
Instead of sucking air from the back and blowing clean air from the front, adopting a structure that sucks air from the side and blows clean air from the front, sucks air from the top and blows clean air from the front It is possible to adopt a configuration.

The operation of the locally-cleaning type air purifier having the above configuration is as follows.

When the fan motor 3 is driven to rotate the fan 4, external air is drawn into the casing 1 from the air suction port 1a through the pre-filter 2, and the air flow is controlled by the air flow control member. Main filter 6
Is blown out from the clean air outlet 1b.

In this case, since the fan 4 is of a centrifugal type (turbo fan), the air inlet 1
The air sucked into the casing 1 from the a is blown out in the centrifugal direction (outer circumferential direction) by the fan 4, then bent at a substantially right angle in the ventilation path formed by the cylindrical wall member 5, passes through the diffuser, and passes through the diffuser. Is blown out from the opening. The blown air is once guided to a rectangular space on the downstream side of the cylindrical wall member 5 and diffuses slightly outward, and then passes through the main filter 6 to become clean air.

As a result, by setting the output of the fan motor 3 in accordance with the fluid resistance of the main filter 6,
30 cm to 150 cm in a blowing direction of clean air defined by a vertical flap, a horizontal flap, or the like (not shown).
A sufficient clean space can be realized in a plane including a desired position in the range of cm (preferably in the range of 40 cm to 100 cm). Here, the lower limit distance is set to 30 cm, preferably 40 cm, in order not to give a feeling of oppression to the user, and the upper limit distance is set to 150 cm, preferably 100 cm, because the width of the bed is set. In order to cover almost the entire range of. The degree of contamination of the clean space is determined by selecting the air purification capability of the main filter 6 so as to be out of the range of the clean air blowout flow (the state in which the blown air flow from the local clean air cleaner 10 has a predetermined flow velocity). In a short time after the start, a certain clean space cannot be formed due to the influence of the surrounding dirty air, that is, 1/7 or less of the degree of fouling outside the effective range for forming a clean space). Preferably, it is 1/10. Specifically, the concentration of suspended mite allergens outside the range of the clean air blowing stream is 22% in the bedroom.
In contrast to 0 pg / m ³ , the concentration of floating mite allergen in the clean space is 30 in the living room.
pg / m ³ ｛Sakaguchi
M, Inouye S, Yasueda H, S
hida T .; "Concentration of
airbone mite allergens
(DerI and Der II)
sleep "Allergy 1992: 47: 5
5-5-See floating mite allergen concentration in bedroom and mite allergen concentration in living room. The measurement of the degree of contamination can be performed by an ELISA method. In other words, air in a room with a high degree of contamination, such as a bedroom, can be purified to a degree of contamination in the living room.

Further, by the photocatalytic action of the photocatalyst layer 8 and the light source 9, inactivation of mite allergen, alteration, decomposition removal of chemical substances such as formaldehyde, deodorization, and the like can be achieved.

The width of the clean space can be increased to 20 cm or more by giving directivity to the blowing of the clean air by vertical flaps and horizontal flaps (not shown). In this case, the clean space can cover the face of an allergic patient or the like.

Next, control of the wind speed distribution will be described.

Consider that the resistance coefficient α of the ventilation resistor represented by the main filter 6 is set to be larger than αmin and smaller than αmax. Here, αmin is a lower limit value that can make the wind speed distribution substantially uniform,
αmax is an upper limit value at which noise applied to the user can be reduced to a predetermined level or less.

Here, αmin is almost 1, and αma
x can be calculated from the required noise level as follows.

The pressure loss of the ventilation resistor is ΔP (mmH
₂ O), the resistance coefficient is α (mmH ₂ O · s / m), the average passing wind speed of the ventilation resistor is v (m / s), and the coefficient is n (n is approximately 1), which is desirable at the point of use. Noise level is SPLＳd
B (A)｝, the specific noise level of the fan used is Ksa
If {dB (A)} and the air volume are Q (m ³ / min),
The pressure loss ΔP of the ventilation resistor is expressed by Expression 1, and the difference between the desired noise level SPL at the point of use and the specific noise level Ksa of the fan to be used is expressed by Expression 2.

[0036]

(Equation 1)

[0037]

(Equation 2)

For example, an air filtration filter is used as the ventilation resistor, a turbo fan is used as the blowing means, and the specific noise level of the turbo fan at 0.5 m is 45 dB.
In the case of (A), the required air volume is 0.7 to ² m ³ / m
in, and if the size of the outlet of the device / the size of the ventilation resistor is 0.3 m × 0.3 m, the average passing wind speed is 0.
13 to 0.37 m / s.

At this time, if an attempt is made to suppress the driving sound at a position 0.5 m from the device to 30 dB (A) or less so as not to hinder sleep, ΔP = 1.65 from Expression 2, and From 1 it becomes αmax = 12.7.

Therefore, by employing a main filter whose resistance coefficient is set so that 1 <α <12.7, the wind speed distribution can be made substantially uniform.
The noise level at the point of use can be suppressed to 30 dB (A) or less.

Further, the clean air outlets 1b to 50
An example of the wind speed distribution in a plane separated by cm is shown in Table 1. In Table 1, the wind speed is cm / s.
It is represented by The rotation speed of the fan motor 3 is set to 650.
rpm and the main filter 6 having a thickness of 35
A polypropylene nonwoven fabric having a thickness of 1 mm was used.
The operating sound level in this case is 3 at a position 50 cm away from the clean air outlet 1b.
In a plane including a position 50 cm away from the clean air outlet 1b, which is 4.4 dB (A), the mite allergen concentration at the center of the clean air outlet flow and the mite allergen concentration outside the range of the clean air outlet flow are determined. The ratio of 1.
6: 100.

[0042]

[Table 1]

FIG. 3 is a diagram showing a wind speed distribution corresponding to Table 1.

In FIG. 3, A1 has a wind speed of 0.25 to 0.25.
In the area of 0.30 m / s, A2 has a wind speed of 0.20 to 0.1 mm.
In the area of 25 m / s, A3 has a wind speed of 0.15 to 0.20.
m / s area, A4 wind speed is 0.10 ~ 0.15m /
s, A5 indicates a region where the wind speed is 0.05 to 0.10 m / s, and A6 indicates a region where the wind speed is 0.00 to 0.05 m / s.

As can be seen from Table 1 and FIG. 3, a substantially uniform wind speed distribution (0.5 to 1.5 times the average wind speed) in a range of 10 cm left and right and 10 cm below the center with respect to the center of the clean air blowing. Wind speed). Since the average wind speed in the above range is 19 cm / s, the user does not feel the draft and can use the device without any inconvenience even when the user is sleeping.

FIG. 4 is a graph showing the mite allergen remaining rate in order to show the distribution of cleanliness. Note that the residual ratio of mite allergens outside the range of the clean air blowing flow is set to 1. In FIG. 4, A1 has a residual ratio of 0.7.
A2 is a region where the residual ratio is 0.6 to 0.7, A3 is a region where the residual ratio is 0.5 to 0.6, and A4 is a region where the residual ratio is 0.4 to 0. In the area of 0.5, A5 has a residual rate of 0.5.
A3 represents a region of 0.4 to 0.4, A6 represents a region of a residual ratio of 0.2 to 0.3, A7 represents a region of a residual ratio of 0.1 to 0.2, and A8 represents a region of a residual ratio of 0.1 to 0.2.
Indicates a region where the residual ratio is 0.0 to 0.1.

As can be seen from FIG. 4, a sufficient clean space can be realized in a range of several tens cm to the left and right with respect to the center of the clean air flow.

Further, it is not necessary to increase the output of the fan motor 3 too much, and since the operating noise can be reduced by providing a sound absorbing material, the operating noise at the position of the user should be 35 dB or less. And remarkable quietness can be realized. As a result, even when the user is sleeping, the user can use the device without any inconvenience.

Further, for example, when an air filtration filter is used as the ventilation resistor and a sirocco fan is used as the blowing means, and the specific noise level of the sirocco fan at 0.5 m is 47 dB (A), the required air volume is 0. 0.7-2
m ³ / min, and if the size of the outlet of the device / the size of the ventilation resistor is 0.3 m × 0.3 m, the average passing wind speed is 0.13 to 0.37 m / s.

At this time, if an attempt is made to suppress the driving noise at a position 0.5 m from the apparatus to 30 dB (A) or less so as not to hinder sleep, ΔP = 1.31 from equation (2). From 1 it becomes αmax = 10.1.

Therefore, by employing a main filter whose resistance coefficient is set so that 1 <α <10.1, the wind speed distribution can be made substantially uniform.
The noise level at the point of use can be suppressed to 30 dB (A) or less.

When this configuration is adopted, the rotation axis of the fan 4 is set at right angles to the clean air blowing surface, so the rotation axis of the fan 4 is set parallel to the clean air blowing surface. Compared with the case, the depth as a whole can be reduced. Further, since the air guide path for guiding the air blown out from the fan 4 to the clean air blow-out port 1b over the entire range is provided,
A device that collects blown air at a location and then diffuses the blown air toward the blowout opening.The cross-sectional height or width of the entire ventilation path can be reduced, and the entire local cleaning type air cleaner Height or width can be reduced. Further, since the depth of the space for expanding the blown air over the entire range of the clean air blowout port 1b can be reduced, the depth as a whole can be further reduced from this point. Furthermore,
The cross-section of the ventilation path can be made relatively large without making the overall height and width of the local cleaning type air purifier so large, so that the wind speed in the ventilation path can be reduced, and noise caused by the wind speed can be reduced. Can be smaller. In addition, in order to blow air in the centrifugal direction (outer peripheral direction), it is preferable to employ a turbo-type fan, so that efficiency can be improved.

[0053]

According to the first aspect of the present invention, a respiratory point of an allergic patient or the like can be quickly and sufficiently cleaned.

The invention of claim 2 has a specific effect that the level of the driving sound can be reduced and the comfort can be increased in addition to the effect of claim 1.

The third aspect of the present invention has a specific effect that the draft can be prevented from being felt in addition to the effects of the first or second aspect.

According to a fourth aspect of the present invention, there is provided the first to third aspects.
In addition to any of the effects described above, a unique effect that the wind speed distribution can be substantially uniformized is exhibited.

The invention of claim 5 is the invention of claims 1 to 4.
In addition to the effect of any one of the above, a unique effect that the width of the face of an allergic patient or the like can be almost covered can be obtained.

The invention of claim 6 is the invention of claims 1 to 5
In addition to any of the effects described above, a unique effect that a large static pressure can be realized for the air volume can be achieved.

[Brief description of the drawings]

FIG. 1 is a central longitudinal sectional view showing one embodiment of a local cleaning type air purifier of the present invention.

FIG. 2 is a front view showing a clean air outlet side.

FIG. 3 is a diagram showing a wind speed distribution corresponding to Table 1.

FIG. 4 is a diagram showing the residual ratio of mite allergens to show the distribution of cleanliness.

[Explanation of symbols]

 1a Air inlet 1b Clean air outlet 4 Fan

 ──────────────────────────────────────────────────続 き Continued on the front page (72) Hiroshi Mine, Inventor 1304, Kanaokacho, Sakai-shi, Osaka Daikin Industries, Ltd. Inside Kanaoka Plant of Sakai Seisakusho Co., Ltd. (72) Mitsuo Obata 1304, Kanaokacho, Sakai-shi, Osaka Daikin Industries, Ltd Sakai Plant Kanaoka Factory

Claims (6)

[Claims] 1. An air purifier for purifying air taken in from an air inlet (1a) and discharging the air from an air outlet (1b), wherein the concentration of floating mite allergens outside the range of the blown air flow is 2%.
At 20 pg / m ³ , the floating allergen concentration at the center of the blown air flow in a plane including a position separated by a predetermined distance of 30 cm or more and 150 cm or less from the air blowing port (1b) in the air blowing direction is 30 pg.
/ M ³ or less, a locally purified air purifier having an ability to reduce the air purifier to / m ³ or less. 2. The operating sound level of the air purifier at a position separated from the air outlet (1b) by a predetermined distance of 30 cm or more and 150 cm or less in the air blowing direction is 3
2. The air purifier according to claim 1, wherein the air purifier is set to 5 dB or less. 3. An air outlet (1b) in a plane including a position separated from the air outlet (1b) by a predetermined distance of 30 cm or more and 150 cm or less in the air blowing direction.
The local cleaning type air purifier according to claim 1 or 2, wherein the average wind speed of the blown air flow in the range of the blown air corresponding to (1) is set to 0.15 to 0.35 m / s. 4. The blown air flow has an average wind speed of 0.5 to 1.0% in a region orthogonal to the air blow direction in a region of 70% or more of a range of blow air corresponding to the air blow port (1b). 4. The locally purified air purifier according to claim 3, wherein the air purifier is five times. 5. When the floating mite allergen concentration outside the range of the blown air flow is 220 pg / m ³ , the region of the blown air flow having a floating mite allergen concentration of ³⁰ pg / m ³ or less is orthogonal to the air blowing direction. 20 in the direction
The local cleaning type air purifier according to any one of claims 1 to 4, which has a size of at least cm. 6. The local cleaning type air purifier according to claim 1, wherein the blowing means (4) for blowing clean air is a centrifugal fan.