WO2000000775A1

WO2000000775A1 - Local cleaning type air cleaner

Info

Publication number: WO2000000775A1
Application number: PCT/JP1999/003547
Authority: WO
Inventors: Toshio Tanaka; Toru Iwata; Hiroshi Mine; Koei Obata
Original assignee: Daikin Industries, Ltd.
Priority date: 1998-06-30
Filing date: 1999-06-30
Publication date: 2000-01-06
Also published as: JP2000018657A

Abstract

A local cleaning type air cleaner comprising a casing (1) having an air sucking port (1a) at the rear center part thereof and a clean air outlet (1b) formed over the almost entire front surface thereof, a fan (4) rotated by a fan motor (3) inside the casing (1), a cylindrical wall member (5) surrounding the entire outer periphery of the fan (4) apart by a specified distance from the fan, and a main filter (6) supported in the square space of the casing (1) at a position forward by a specified distance from the opening part of the cylindrical wall member (5), whereby the degree of contamination of air at a desired position within 30 to 150 cm of the clean air outlet (1b) is reduced to 1/7 or less, desirably to 1/10, of that out of the area of a clean air discharge stream so as to rapidly increase the cleanliness of air within a specified area in front of the clean air outlet (1b).

Description

TECHNICAL FIELD The present invention relates to a local cleaning type air cleaner, and a method of cleaning the air by sucking air from the outside, and blowing the purified air from an air outlet to a predetermined area in front of the air outlet. The present invention relates to a locally purified air purifier capable of rapidly increasing the cleanliness of air (locally at a respiratory point of an allergic patient or the like). BACKGROUND ART Conventionally, air purifiers have been widely used to purify indoor air. Especially in households with allergic patients, it is common to install an air purifier to purify the indoor air.

However, air purifiers that have been widely used in the past are manufactured for the purpose of purifying indoor air.For example, air purifiers that operate efficiently when installed in corners of rooms, etc. The outlet for clean air is provided upward. When an air purifier with this configuration is used, it is considered that the effect of house dust and mite allergen (mite antibody) on patients with allergic diseases can be significantly reduced by purifying the air in the room. ing.

However, in practice, even when the air purifier having the above configuration is employed, the effects of house dust and mite allergens on allergic patients cannot be sufficiently reduced. More on this point Will be described. In general, there are tatami mats, futons, etc. in the room where allergic patients are lying. Especially, the futons are homes of mites and therefore contain a huge amount of mite allergens. Therefore, for example, house dust, mite allergens, etc. are scattered from tatami mats when other people walk, and house dust, dania, regglants, etc. are also generated when an algery patient turns over. House dust and mite allergens are also scattered due to scattering and raising and lowering of futons, resulting in an increase in the amount of floating dust and allergens. Here, house dust and mite allergen as antigens are different, but mite allergen particles are also a kind of dust dust, and mite allergen may be attached to house dust. As for the force, the properties of mite allergen particles, such as floating, scattering, and sedimentation, are similar to those of Haustust. Therefore, it is common for house dust and mite allergens to float simultaneously. When house dust, mite allergens, etc. are scattered in this way, the indoor air is gradually purified in accordance with the capacity of the air purifier, so that the respiratory points of allergic patients, etc. It takes a remarkably long time to be completely clean, and during this period, allergic symptoms such as allergic symptoms appear due to the mite allergen and the like, causing pain for allergic patients and the like. In the above, explanations were given for allergic patients, etc., but similar inconveniences occur even if they are not allergic patients, etc., if they are adversely affected by house dust, mite allergen, etc. I do. Of course, the same disadvantages occur when mold, pollen, and harmful gas substances are present.

The present invention has been made in view of the above-described problems, and has a local clean air that can rapidly increase the cleanliness of air in a predetermined range (a local area such as a respiratory point of an allergic patient) in front of an air outlet. Providing a purifier It is intended for. DISCLOSURE OF THE INVENTION The local cleaning type air purifier of claim 1 is characterized in that the blown air in a plane including a position separated by a predetermined distance of not less than 30 cm and not more than 150 cm in the direction of blowing air from the air blowing port. The degree of dirt at the center of the flow is set to 1-7 or less of the degree of dirt outside the blown air flow. The locally purified air purifier of claim 2 adopts the number of suspended particles as the degree of contamination.

The locally-cleaning type air purifier of claim 3 employs an air purifier capable of directly or indirectly measuring the degree of contamination from the number of suspended particles.

The locally purified air purifier according to claim 4 employs a floating allergen as the degree of contamination.

The operation sound of the air purifier in a plane including a position separated by a predetermined distance of not less than 30 cm and not more than 150 cm in the air blowing direction from the air blowing port is provided. The level is set to 35 dB or less.

The locally purified air purifier according to claim 6 corresponds to an air outlet on a plane 內 including a position separated by a predetermined distance of not less than 3 O cm and not more than 150 cm in the air blowing direction from the air outlet. The average wind speed of the blown air flow in the range of the blown air is set to 0.15 to 0.35 mZ s.

In the local cleaning type air purifier according to claim 7, the blown air flow has an average wind speed of 70% or more of a range of the blown air corresponding to the air blowout port on a plane orthogonal to the air blowout direction. 0.5 to 1.5 times It is configured so that

In the local cleaning type air purifier according to claim 8, the area having a degree of contamination of 17 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. It is configured to have. According to a ninth aspect of the present invention, there is provided a locally purified air purifier which employs a centrifugal fan as a blowing means for blowing clean air.

In the case of the locally purified air purifier of claim 1, in purifying the air taken in from the air inlet and discharging it from the air outlet,

The degree of dirt at the center of the blown air flow 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 is the degree of dirt outside the blown air flow. Since it is set to 1 Z 7 or less, the respiratory point of allergic patients etc. is quickly and sufficiently cleaned within almost the entire width of the bed without giving a feeling of discomfort such as pressure. be able to. Specifically, even in a place with a high degree of air contamination, such as a bedroom, the degree of contamination can be reduced to the level of a living room.

In the case of the locally purified air purifier of claim 2, since the number of suspended particles is adopted as the degree of contamination, the amount of house dust, mite allergen, etc. can be reduced to + minutes, The same effect as in item 1 can be achieved.

Since the locally purified air purifier of claim 3 employs a degree of contamination that can be measured directly or indirectly from the number of suspended particles, the mite allergen which has a correlation with the number of suspended particles is used. Etc. can be sufficiently reduced, and the same effect as in claim 1 can be achieved.

In the case of the locally purified air purifier of claim 4, since the degree of contamination is based on the floating allergen, the amount of the floating allergen is determined. In addition to the sufficient reduction, the same operation as in claim 1 can be achieved.

In the case of the locally purified air purifier of claim 5, the operation 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. Since the sound level is set to 35 dB or less, in addition to the effect of any one of claims 1 to 4, the driving sound level can be lowered to enhance comfort and, consequently, the driving sound You can go to bed without worrying.

In the case of the locally-cleaning type air purifier of claim 6, it corresponds 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 the air blowing direction. Since the average wind speed of the blown air flow in the range of blown air to be blown is set to 0.15 to 0.35 mZs, in addition to the function of any one of claims 1 to 5, Can be made not to feel. In the case of the locally-cleaning type air purifier of claim 7, the blown air flow has an average wind speed in a region orthogonal to the air blowing direction in an area of 70% or more of a range of the blown air corresponding to the air blowing port. Since the wind speed is 0.5 to 1.5 times the wind speed, the wind speed distribution can be made substantially uniform in addition to the operation of claim 6.

In the local cleaning type air purifier according to claim 8, the area having a dirt degree of 1/7 or less of the degree of dirt outside the blown air flow has a size of 20 cm or more in a direction orthogonal to the air blowing direction. Therefore, in addition to the effects of any one of claims 1 to 7, it is possible to cover almost the width of the face of an allergic patient or the like.

In the case of the locally purified air purifier of claim 9, since the blowing means for blowing out the clean air is a centrifugal fan, in addition to the effect of any one of claims 1 to 8, it is possible to reduce the air volume. A large static pressure can be realized. BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a central longitudinal sectional view showing an embodiment of the local cleaning type air purifier of the present invention.

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

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

FIG. 4 is a graph showing the residual ratio of mite allergens showing the distribution of cleanliness. BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, embodiments of the present invention will be described 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 cleaning air outlet side. This local air cleaner 10 has an air inlet la at the center of the rear, a casing 1 with a clean air outlet 1b over almost the entire front area, and an air inlet 1a. A pre-filter (for example, a filter that removes only large-diameter dust particles) 2 provided on the back of the casing 1 so as to cover it, and a support member (not shown) in front of the air suction port 1a inside the casing 1 A fan 4 provided between the fan motor 3 and the air intake port 1a, the fan 4 being rotated by the fan motor 3, and an entire outer periphery of the fan 4. And a main filter supported in a rectangular space of the casing 1 at a predetermined distance before the opening of the cylindrical wall member 5.

(Filter with high air purification capacity) 6 and clean air outlet 1 b The photocatalyst layer 8 provided on the end face of the front grille 7 and the main filter 6 on the upstream side of the air flow, and the photocatalyst layer 8 is provided at a predetermined position on the upstream side of the air flow from the photocatalyst layer 8, and A light source 9 for irradiating light including light. The fan 4 is of a centrifugal type such as a turbo fan or a sirocco fan. This is because a high collection efficiency is used as the main filter 6, so 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. The cover of the fan motor 3 also serves as a differential user on the 內 side of the air passage. The photocatalyst layer 8 supports a metal oxide having a photocatalytic action. In addition, a dirt prevention cover 9a is provided at a predetermined position of the light source 9 near the upstream side of the air flow.

In addition, it is preferable to provide a diffuser that reduces the blowout flow of the fan 4 to collect the dynamic pressure and that makes the blowout wind speed distribution uniform. Further, it is preferable to provide a stationary blade having a shape for removing the swirling speed component of the blowout flow by the fan 4 in the blowout flow path 內. 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. It is preferable to control the blowing wind speed distribution. Further, it is preferable to provide a sound absorbing material on the wall surface of the blow-out flow passage to reduce the operation noise.

However, instead of adopting a configuration in which air is sucked in from the back and blown out clean air from the front, a configuration that blows clean air in from the side and blows out clean air from the front should be adopted as the local clean air purifier. It is possible to adopt a configuration in which air is sucked in from the top surface and clean air is blown out from the front surface.

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

By driving the fan motor 3 and rotating the fan 4, external air The air is sucked into the casing 1 from the air suction port 1a through the filter 2, and is blown out from the clean air blowing port 1b through the main filter 6 while the air flow is controlled by the diffuser.

In this case, since the fan 4 is of a centrifugal type (turbo fan), the air drawn into the casing 1 from the air suction port 1a is centrifugal (outer direction) by the fan 4. Then, it is bent at a substantially right angle in the ventilation path formed by the cylindrical wall member 5, and is blown out from the opening of the cylindrical wall member 5 through the diffuser. The blown air is guided into a rectangular space downstream 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, in the clean air blowing direction defined by vertical flaps, horizontal flaps, etc. A sufficient clean space can be realized in a plane including a desired position of cm in a range of 50 cm (preferably in a range of 40 cm to 100 cm). Here, the lower limit distance is set to 30 cm, preferably 40 cm, so as not to give a feeling of oppression to the user, and the upper limit distance is set to 150 cm, preferably 100 cm. The reason for setting cm is to cover almost the entire range of the bed width. The degree of contamination of the clean space can be determined by selecting the air purifying ability of the main filter 6 to be outside the range of the clean air blowout flow (the blowout air flow from the local clean air purifier 10 has a predetermined flow velocity). In the short time after startup, it cannot reach a certain clean space due to the influence of the surrounding dirty air, that is, outside of the effective range capable of forming a clean space. 7 or less, preferably 1/10. Specifically, while the floating Daniare Rugen concentrations outside the scope of the clean air blowout flow is 2 2 0 pg Z m ³ in the bedroom, the clean space Airborne mite allergen concentration in the living room can be reduced to 30 pg / m "{Sakaguchi M, I nouye

S, Y asueda H, Shida T. Concentration of airbour nemiteallergens (Der I and Der II) duringslee, "Allergy 1992: 47: 55-57 Refer to the concentration of airborne mite allergen in the bing room} The degree of contamination can be measured by ELISA, in other words, the air in a room with a high degree of contamination, such as a bedroom, is removed from the living room. It can be cleaned to the degree of air contamination.

Further, the photocatalysis by the photocatalyst layer 8 and the light source 9 can also achieve inactivation, alteration, decomposition, removal of chemical substances such as formaldehyde, deodorization, and the like, such as danallergen.

The width of the clean space can be made 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 min and smaller than _α max. Here, amin is a lower limit value at which the wind speed distribution can be made substantially uniform, and amax is an upper limit value at which noise applied to the user can be reduced to a predetermined level or less.

Here, a min is almost 1, and a max can be calculated from the required noise level as follows.

The pressure loss of the draft resistor Δ P (mmH ₂ O), the resistance coefficient α (mm Η ₂ O · s / m), the average passing wind speed of the ventilation resistor is v (m / s), the coefficient is n (n is approximately 1), and the desired noise level at the point of use is SPL {dB (A)}. If the specific noise level of the fan to be used is K sa {dB (A)} and the air volume is Q (m ³ / min), the pressure loss Δ の of the ventilation resistor is expressed by equation (1). , the difference between the ratio _t noise level K sa fans use desirable noise level SPL in the use point is expressed by equation (2).

Α Ρ = α ν ^π

SPL - K sa = 1 0 - log (QZ 6 0厶^{P 2) · · · (2} )

For example, if an air filtration filter is used as the ventilation resistor and a turbo fan is used as the blowing means, and the specific noise level at 0.5 m of the turbo fan is 45 dB (A), the necessary air volume Ri is 0. 7 ~ 2 m ³ Zm in der, if outlet size ventilation resistor device size 0. 3 m X 0. 3 m, mean transit wind speed 0.1 3 to 0.3 7 mZ s.

At this time, if the driving noise at a position 0.5 m from the device is to be suppressed to 30 dB (A) or less so as not to disturb sleep, from equation (2), P = 1. 6 5, and from equation (1), _a max = 12.7.

Therefore, by using a main filter with a resistance coefficient set so that 1 < _α <12.7, the wind speed distribution can be made almost uniform, and the noise level at the point of use can be reduced to 3 0 d Β (A).

Table 1 shows an example of the wind speed distribution in a plane 50 cm away from the clean air outlet lb. In Table 1, the wind speed is expressed in cm / s. The rotation speed of the fan motor 3 was set to 65500 rpm, and the main filter 6 was made of a non-woven polypropylene fabric having a thickness of 35 mm. The operating sound level in this case is 50 cm away from the clean air outlet lb. 34.4 dB (A), and in a plane including a position 50 cm away from the clean air outlet lb, the concentration of the Daniellegen at the center of the clean air outlet and the clean air outlet The ratio to mite allergen concentration out of range was 1.6: 100.

Fig. 3 shows the wind speed distribution corresponding to Table 1.

In Fig. 3, A1 represents the region where the wind speed is 0.25 to 0.30 mZ s, A2 represents the region where the wind speed is 0.20 to 0.25 m / s, and A3 is the wind speed. Is in the range of 0.15 to 0.20 mZ s, A 4 is in the range of 0.10 to 0.15 mZ s, and A 5 is in the range of 0.05 to 0.10 mZ s 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, the wind speed distribution is approximately uniform over a range of 10 cm above and below, 10 cm below and 10 cm below the center of the clean air outlet (0.5% of the average wind speed). ~ 1.5 times the wind speed). And, since the average wind speed in the above range is 19 cmZs, the user does not feel the draft and can use the device without any inconvenience even when the user is sleeping. Fig. 4 shows the residual ratio of mite allergens to show the distribution of cleanliness. The residual rate of mite allergens outside the range of the clean air blowing flow is set to 1. Also, in FIG. 4, A 1 indicates a region where the residual ratio is 0.7 to 0.8, A 2 indicates a region where the residual ratio is 0.6 to 0.7, and A 3 indicates a region where the residual ratio is 0.5. A4 is the area where the residual rate is 0.4 to 0.5, A4 is the area where the residual rate is 0.3 to 0.4, and A6 is the area where the residual rate is 0.3 to 0.4. Is in the range of 0.2 to 0.3, A7 is in the range of survival rate of 0.1 to 0.2, and A8 is in the range of survival rate of 0.0 to 0.1. .

As can be seen from Fig. 4, a sufficient clean space can be realized within a range of 10 cm on both sides based on the center of the clean air flow.

Furthermore, since it is not necessary to increase the output of the fan motor 3 too much, and the sound absorbing material can be provided to reduce the operating noise, the operating noise at the position of the user should be reduced to 35 dB or less. And extremely quiet operation can be realized. As a result, it can be used without any inconvenience even when the user is sleeping.

Furthermore, for example, an air filtration filter is used as a ventilation resistor, and a sirocco fan is used as a blower. The specific noise level of the sirocco fan at 0.5 m is 47 dB. If it is (a), an air volume necessary 0. 7 ~ 2 m ³ Bruno min, if outlet size ventilation resistor size 0. 3 m X 0. 3 m devices, mean transit wind speed Is between 0.13 and 0.37 m / s.

At this time, if the driving sound at a position 0.5 m from the device is to be suppressed to 30 dB (A) or less so as not to disturb sleep, from equation (2), P = 1. 3 1, and o: max = 10.1 from equation (1).

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

In addition, when this configuration is adopted, the rotation axis of the fan 4 is set at a right angle to the clean air blowing surface, so that the rotation axis of the fan 4 is set parallel to the clean air blowing surface. The overall depth can be reduced as compared with. In addition, since the airflow path that guides the air blown from the fan 4 to the clean air blowout port 1b over the entire area is provided, the blowout air is once collected at one location, and then the blowout air is blown out. To reduce the height or width of the cross section of the whole ventilation path, and reduce the height or width of the entire local cleaning type air cleaner. be able to. Furthermore, since the depth of the space for expanding the blown air over the entire area of the clean air blowout port 1b can be reduced, the overall depth can be further reduced from this point. Furthermore, since the cross section of the ventilation path can be made relatively large without increasing the height and width of the entire local cleaning type air purifier, the wind speed in the ventilation path 內 can be reduced, and the wind speed can be reduced. The sound caused by the noise can be reduced. To blow air in the centrifugal direction (outer circumferential direction), it is preferable to use a turbo-type fan, which can improve efficiency. INDUSTRIAL APPLICABILITY The local cleaning type air purifier of the present invention can be used for an application for rapidly cleaning a local area in front of an air outlet.

Claims

The scope of the claims

1. An air purifier that purifies air taken in from the air inlet (la) and discharges it from the air outlet (lb).

30 cm or more from the air outlet (lb) in the air blowing direction

In a plane including a position separated by a predetermined distance of 150 cm or less, the degree of contamination at the center of the blown air flow is set to 17 or less of the degree of contamination outside the blown air flow. Locally clean air purifier.

2. The local cleaning type air purifier according to claim 1, wherein the degree of contamination is the number of suspended particles.

3. The locally purified air purifier according to claim 1, wherein the degree of fouling can be measured directly or indirectly from the number of suspended particles.

4. The locally purified air purifier according to claim 1, wherein the degree of contamination is based on a floating allergen.

5. A request to set the operating sound level of the air purifier at a distance of at least 30 cm and at most a predetermined distance of 150 cm or less from the air outlet (lb) in the air blowing direction to 35 dB or less. The locally purified air purifier according to any one of claims 1 to 4.

6. The range of the blow-off air corresponding to the air blow-out port (lb) in a plane including a position separated from the air blow-out port (lb) by a predetermined distance not less than 30 cm and not more than 150 cm in the air blow-out direction The local cleaning type air purifier according to any one of claims 1 to 5, wherein an average wind speed of the blown air stream in (1) is set to 0.15 to 0.35 m / s.

7. In the area perpendicular to the direction of air blowing, the air velocity is 0.5 to 1.50 of the average wind velocity in the area of 70% or more of the area of the blowing air corresponding to the air blowing port (lb). 7. The local cleansing according to claim 6, which is 5 times. Clean air purifier.

8. The air blown air flow according to any one of claims 1 to 7, wherein the area having a degree of contamination of 17 or less of the degree of dirt outside the air flow has a size of 20 cm or more in a direction orthogonal to the air blowing direction. The locally purified air purifier according to any one of the above. 9. The local cleaning type air purifier according to any one of claims 1 to 8, wherein the blowing means (4) for blowing clean air is a centrifugal fan.