JP3619640B2 - Air purifier - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an air cleaning device for air cleaning, for example, a clean room for manufacturing semiconductors and liquid crystals, a clean bench, a hospital room, and recently, an air cleaning device for air cleaning which is expected to be installed in a general house. Is.
[0002]
[Prior art]
As shown in Japanese Patent Application Laid-Open No. 8-309129, a typical air cleaning device as a conventional air cleaning device for air cleaning includes a centrifugal fan connected to a motor shaft in a rectangular container, The mainstream is configured with a filter on the downstream side. Air is sucked from the suction pipe by the rotation of the fan, and the pressure is increased by the fan. It has a structure in which clean air is sent out into the clean room through a filter arranged almost perpendicular to the fan rotation axis.
[0003]
At this time, due to the characteristics of the centrifugal fan placed in the container, the flow is in the circumferential direction of the fan and is biased outward from the central side of the air purifier, so the wind speed distribution at the filter outlet is not uniform. In some cases, an outer baffle plate for improving the wind speed distribution is attached to the outer side of the container. In addition, a supporting member for supporting the motor is installed between the fan and the filter.
[0004]
[Problems to be solved by the invention]
A large-scale clean room needs thousands of air purifiers. In that case, it is an air cleaning device for air purification that consumes several tens of watts per unit, but the annual power consumption is 600,000 Kwh, and heat generation also becomes a load on the air conditioner in the clean room. Since air conditioning load power equivalent to the above power cost is required, there is an urgent need to save power in an air cleaning device for air cleaning. Moreover, since ceiling-installed type air purifiers have come to be used in ordinary houses as well, power saving is required as well.
[0005]
In addition, since the air purifier is installed on the ceiling, it is required to be lightweight, thin, and high-strength in order to perform maintenance from the back of the ceiling to reduce the construction cost of the building, and to reduce noise to improve the work environment. Is done.
[0006]
An object of the present invention is to reduce the power consumption, thickness, and noise of an air purifier.
[0007]
[Means for Solving the Problems]
The above problem is that an air purifier in which a swirling flow of air flowing out in a centrifugal direction from a centrifugal fan is changed to a direction parallel to the axial center of the fan shaft of the centrifugal fan, and a filter for air purification is arranged downstream thereof. The apparatus includes a motor support member that supports the drive motor of the centrifugal fan, and the motor support member has one or more notches formed in a part of the baffle plate, and a tongue member is provided in the notch. It is achieved by the.
[0008]
Further, the above-described problem is that one or a plurality of bent portions are provided in one part of the baffle plate, and the bent portions are located on the outer periphery of the fan to serve as tongue members, and a portion vacated in the direction of the filter by the bending is provided. This is achieved by being formed.
[0009]
DETAILED DESCRIPTION OF THE INVENTION
FIG. 1 shows an embodiment of the present invention. Arrows indicate air flow. The container 1 supports a suction pipe 2, which is an air intake port, a centrifugal fan 3, a motor 5 for driving the same, a baffle plate 9 provided on both outer sides of the container 1 for uniforming the wind speed distribution, and a motor. The fan / air cleaning device is configured to include a motor support member 6 and a filter 10 for cleaning air downstream thereof. The basic tongue member 7 of the present invention is disposed in the circumferential direction (centrifugal direction) of the centrifugal fan 3 and is provided on a part of the container 1 or the motor support member 6. The tongue member 7 is attached or integrally formed.
[0010]
FIG. 2 shows an aa cross-sectional arrow view of the present embodiment. In this example, tongue members 7 are provided at two locations in the circumferential direction of the container 1. Arrows indicate air flow. The flow of air sucked from the suction pipe 2 is increased in pressure by the centrifugal fan 3, and the amount of air flows from the centrifugal fan 3 to the relatively outside of the container 1 with a swirling component. The biased air flow having a swirling component is blocked by the tongue member 7. A suitable swirling flow blocked by the tongue member 7 includes a flow flowing between the centrifugal fan 3 and the filter 10 and a flow flowing between the tongue member 7 and the baffle plate 9 as shown in FIG. Become part of.
[0011]
Thus, the baffle plate 9 provided on both outer sides of the container 1 provided for uniforming the wind speed distribution of the air blown out from the entire filter 10 is made relatively uniform between the baffle plates 9. The entire filter 10 mounted downstream is made uniform and blown out into the clean room (outside the air cleaning device).
[0012]
When the tongue member 7 is not provided, the swirling flow of air swirls in the container and causes a large loss. On the other hand, the tongue member 7 turns the flow direction so as to stop the flow. A part of the pressure can be recovered, which increases the fan static pressure increase value, and the fan theoretical pressure increase value hardly changes, leading to an increase in fan efficiency.
[0013]
One or a plurality of tongue members 7 may be attached to a portion having a large effect in the container 1. Further, if the tip of the tongue member 7 is provided with the tongue tip 8 formed of a curved bent portion so that the collision loss of the swirling flow from the centrifugal fan 3 does not increase and the fan noise does not increase, high efficiency is achieved. Effective in reducing noise. Instead of bending the tip, a curved part may be mounted.
[0014]
Since the distance between the tongue tip 8 and the fan outer diameter is determined by the distance between the fan tip and the tongue tip 8, the static pressure rise is maximum in the state where the blade noise is small. It is important to attach to the position and shape.
[0015]
FIG. 3 is a longitudinal sectional view showing another configuration of the present invention. Arrows indicate air flow. A member 6 that supports the motor is disposed between the filter 10 and the inner surface of the container 1 facing the filter 10. The tongue member 7 is disposed between the motor support member 6 and the inner surface of the container 1 facing the filter, and extends from the inner surface of the container 1 facing the outer periphery of the centrifugal fan 3 toward the circumferential direction of the fan. Has been.
[0016]
The tongue member 7 has the role of restoring the swirling flow from the fan to static pressure, and has the effect of uniforming the wind speed distribution downstream of the filter in cooperation with the motor support member 6. Even when walking on the upper surface of the container 1, there is an effect that the deformation of the container can be prevented by the motor support member 6 and the tongue member 7. Further, by setting the area and shape of the motor support member 6 optimally, it is possible to accurately adjust the uniform wind speed distribution downstream of the filter.
[0017]
4 is a cross-sectional view taken along the line aa in FIG. Although the air flow is not illustrated, the tendency is substantially the same as in FIG. The baffle plate 9 has a rectangular shape in the figure, but may have an arbitrary shape for improving the wind speed distribution. Further, when the tip of the tongue member 7 is a rounded tongue tip 8, there is also an effect of preventing the generation of abnormal noise called blade noise, which is a problem with centrifugal fans.
[0018]
Another embodiment of the present invention will be described with reference to FIGS. Although the air flow is not illustrated, the tendency is substantially the same as in FIGS. 1 and 2.
FIG. 5 is a longitudinal sectional view, and FIG. 6 is a front view taken along the line aa in FIG. The tongue member 7 is installed between the motor support member 6 and the inner surface of the container 1 facing the filter 10, and the effect is the same as in the above-described embodiment. The motor support member 6 is larger than the outer diameter of the centrifugal fan 3 and is characterized by covering the outer periphery of the fan when viewed from the filter 10 side. When the width dimension of the motor support member 6 arranged at the downstream position of the centrifugal fan 3 is made larger than the outer diameter of the centrifugal fan 3, the flow from the centrifugal fan 3 is gently between the motor support member 6 and the inner surface of the container 1. Accordingly, the static pressure is increased in combination with the effect of restoring the static pressure of the swirling flow of the tongue member 7, and the fan efficiency is improved.
[0019]
Another embodiment of the present invention will be described with reference to FIGS. Although the air flow is not illustrated, the tendency is substantially the same as in FIGS. 1 and 2.
FIG. 7 is a longitudinal sectional view, and FIG. 8 is a view taken along the line aa in FIG. The components are the same as those of the above embodiment, but the difference is the portion where the tongue member 7 of the motor support member 6 is attached, and the surface where the swirl flow of the centrifugal fan 3 collides partially forms a notch. It has been done.
[0020]
In this case, the effect of the tongue member 7 for stopping the swirling flow of the fan is substantially the same, but after the swirling flow collides with the tongue member 7, the flow smoothly flows in the direction of the filter 10 at the notch portion, and Since the air resistance between the filter 10 and the motor support member 6 is reduced, and the air is blown out relatively uniformly from the entire filter 10, the entire air volume is increased.
[0021]
FIG. 9 schematically shows the flow around the tongue member 7. When there is no tongue member 7 due to the rotation of the centrifugal fan 3, the flow from the centrifugal fan 3 flows while turning from the bottom to the top in the figure, and leaks between the outer periphery of the fan and the inner surface of the container as indicated by the broken line. While most of the dynamic pressure is lost, if the tongue member 7 is present, the flow is blocked, and the flow smoothly flows between the motor support member 6 and the filter 10 from the notch portion of the motor support member. This leads to an increase in the air volume of the air purifier.
[0022]
FIG. 10 shows the air volume / pressure / efficiency characteristics of the fan with and without the tongue member 7 in the embodiment shown in FIGS. The clearance between the tongue member 7 and the outer periphery of the centrifugal fan 3 is 2.5% of the fan outer diameter, and the tongue material tip has a curved tongue tip 8 at the tip of the tongue material. The horizontal axis is the same as the design air volume when the tongue member 7 is not provided, and the pressure on the vertical axis is the same, and the efficiency indicates the ratio at the design air volume point of the conventional model as 100%. When the tongue member 7 is installed in contrast to the conventional case where the tongue member 7 is not provided, the pressure is significantly increased below the design air volume point, and the efficiency is also improved in the small air volume region.
[0023]
Although the conventional design air volume point has a power saving effect of about 9%, the effect of this tongue member is the greatest in recent high external static pressure, that is, in the field of high static pressure required outside the clean room. I understand.
[0024]
Another embodiment of the present invention will be described with reference to FIGS.
11 is a longitudinal sectional view, and FIG. 12 is a view taken in the direction of arrows aa in FIG. In this embodiment, the motor support member 6 according to the embodiment is divided into a motor support member 6 and a baffle plate. By adopting this method, the motor support member 6 can be made small, the baffle plate can be formed in an arbitrary shape, the wind speed distribution can be improved, and the structural strength of the entire air cleaning device can be improved.
[0025]
FIG. 13 shows another embodiment. The tongue member 6 can be formed in the container when the motor support member 6 is bent in advance. Although the performance is the same as that of the above-described embodiment, there is an effect that the effect can be exhibited in reducing the number of parts and the strength of the container can be improved. In FIG. 13, the motor support member 6 and the baffle plate 11 for improving the fan static pressure are integrated, but the effect is the same as a separate body, and the planar shape can easily adopt an arbitrary shape for improving the wind speed distribution. .
[0026]
FIG. 14 shows another embodiment of the present invention. FIG. 15 is a view taken along arrow bb in FIG. This embodiment is characterized in that a guide 12 is provided on the windward side of the tongue member 6 so that the swirling flow of the fan does not collide with the tongue member at a right angle. By doing so, there is a merit that the collision loss can be minimized and the air volume of the air cleaning device can be improved. Although it is installed with two tongue members in the circumferential direction of the fan, a single or a plurality of tongue members may be installed at a position where the effect is produced.
[0027]
FIG. 16 shows another embodiment of the present embodiment. The tongue portion tip 8 is characterized by being inclined with respect to the blade 4 of the centrifugal fan 3. If the tip of the tongue is tilted, there is a great effect in suppressing the generation of abnormal noise called blade noise, which is a problem with centrifugal fans. Although the tongue tip 8 is higher on the filter side in the figure, the reverse may be possible depending on the difference in the overall structure of the air cleaning device.
[0028]
Another embodiment of the present invention will be described with reference to FIGS.
FIG. 17 is a longitudinal sectional view, and FIG. 18 is a view taken in the direction of arrows aa in FIG. A structural member in which the tongue member 7 for stopping the swirling flow from the fan is attached to a part of the drive system 13 that supports the motor 5 that drives the centrifugal fan 3 and also supports the suction pipe is assembled in advance. It is inserted into the container 1 from above and installed.
[0029]
If such a structure is adopted, even if an operator walks on the upper part of the container at the time of maintenance, the centrifugal fan 3 and the suction pipe 2 are deformed in the same body (relatively not deformed), so that the gap between them can be made smaller than before. Leakage from the gap can be reduced and the air volume can be improved. If only this part is replaced even when the user changes the specification, the specification can be changed, and the strength of the container is improved. In FIG. 18, the planar shape of the drive system unit 13 is rectangular, but other shapes may be used. Further, when a gap is generated between the inner surface of the container and the drive system 13 is inserted into the container 1, the auxiliary member 14 is installed so as to be continuous between the end of the tongue member 7 and the inner surface of the container. A decrease in air volume and an increase in noise can be prevented.
[0030]
【The invention's effect】
Since the swirl flow from the fan is smoothly redirected to the filter direction, it is possible to increase the fan efficiency by almost 10% in the general high-external static pressure target model. As a result, about 5-10% This has the effect of reducing the power consumption of fans and air purifiers.
Further, the high efficiency of this fan has the effect of reducing the noise by reducing the thickness of the fan / air purifier and reducing the rotational speed.
In addition, the high efficiency of the fan can reduce the thickness of the container, and can improve the construction cost and installation of the clean room.
[Brief description of the drawings]
FIG. 1 is a longitudinal sectional view of an air cleaning device according to an embodiment of the present invention.
FIG. 2 is a cross-sectional view taken along the line aa in FIG.
FIG. 3 is a longitudinal sectional view of an air cleaning device according to another embodiment of the present invention.
4 is a cross-sectional view taken along the line aa in FIG. 3;
FIG. 5 is a longitudinal sectional view of an air cleaning device according to another embodiment of the present invention.
6 is a cross-sectional view taken along the line aa in FIG. 5;
FIG. 7 is a longitudinal sectional view of an air cleaning device according to another embodiment of the present invention.
8 is a cross-sectional view taken along line aa in FIG.
FIG. 9 is a partial perspective view showing a flow state of the present invention.
FIG. 10 is a diagram showing fan performance showing the effect of the present invention.
FIG. 11 is a longitudinal sectional view of an air cleaning device according to another embodiment of the present invention.
12 is a cross-sectional view taken along the line aa in FIG.
FIG. 13 is a bottom view of the air cleaning device according to the embodiment of the present invention.
FIG. 14 is a bottom view of the air cleaning device according to the embodiment of the present invention.
15 is a cross-sectional view taken along the line bb in FIG.
16 is a cross-sectional view taken along the line cc of FIG.
FIG. 17 is a longitudinal sectional view of an air cleaning device according to another embodiment of the present invention.
18 is a cross-sectional view taken along the line aa in FIG.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 ... Container, 2 ... Suction pipe, 3 ... Centrifugal fan, 4 ... Blade, 5 ... Motor,
DESCRIPTION OF SYMBOLS 6 ... Motor support member, 7 ... Tongue member, 8 ... Tongue tip, 9 ... Baffle plate, 10 ... Filter, 11 ... Baffle plate, 12 ... Guide, 13 ... Drive system part, 14 ... Auxiliary member

Claims (2)

In an air cleaning device in which a swirling flow of air flowing out from a centrifugal fan in a centrifugal direction is changed to a direction parallel to the axis of the fan shaft of the centrifugal fan, and a filter for cleaning air is disposed downstream of the container.
A motor support member for supporting the drive motor of the centrifugal fan, wherein the motor support member has one or more notches formed in a part of the baffle plate, and a tongue member is provided in the notch portion; Features an air purifier. In the air cleaning device of claim 1,
One or a plurality of bent portions are provided in a part of the baffle plate, and the bent portions are positioned on the outer periphery of the fan to serve as tongue members, and a portion that is free in the direction of the filter is formed by the bending. An air purifier characterized by.

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