JPH0263519A - Air flow rate control device for air cleaner - Google Patents

Abstract

PURPOSE:To keep the air flow rate almost constant even when a filter is clogged by controlling the number of axial blowers to be put into operation according the pressure difference between the front and the rear of the filter and making the flow direction of each blower to be in series. CONSTITUTION:The outputs Pa, Pb of pressure detectors 14, 15 of the front and rear of the filter 7 are read out to get the difference between them. When the clogging of the filter 7 is proceeded, the pressure difference between the front and the rear of the filter 7 becomes large, and it reaches to a first specified value K1, a blower 12 is added to put into operation. The blower 12 is revolved in the reverse direction to a blower 11 so that the blowing direction is in series. When the clogging of the filter 7 is more proceeded and the pressure difference reaches to a 2nd specified value K2, a blower 13 is added to put into operation. In this case, the blower 13 is revolved in the same direction as the blower 11 so that the blowing direction is in series. Thus, the flow rate of air is kept sufficiently and in almost constant even when the filter is clogged.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a device for controlling the amount of air blown out of an air cleaner.

[Conventional technology]

Figures 5 and 6 are diagrams showing a conventional air purifier disclosed in, for example, Japanese Utility Model Application Publication No. 59-40741, in which Figure 5 is a vertical cross-sectional view and Figure 6 is a static pressure/air volume characteristic curve. It is a diagram.

In the figure, (1) is the main body, (2) is the suction port provided in the main body (1), (3) is the same outlet, (4) is a radial blower driven by a motor (not shown), 5) is a dust collector provided between the blower (4) and the suction port (2), and is composed of an electrode part (6) and a dust removal filter (7).

A conventional air purifier is configured as described above, and includes a blower (4
) rotates, indoor air is sucked in through the suction port (2), passes through the dust collector (5) to collect dust, and clean air is blown into the room through the blowout port (3), which is then used repeatedly in the series. returned. As is well known in the dust collector (5).

When the dust particles pass through the electrode section (6) to which a DC high voltage is applied, the dust particles are positively charged, and are attracted and collected by the negative side of the dielectrically polarized filter (7).

The static pressure/air volume characteristics of the radial blower (4) are as shown in curve A in Figure 6, and it is suitable when high static pressure is desired.
It is not suitable when you want to increase the wind ik. On the other hand, an axial blower is suitable for increasing the air volume as shown by curve B in FIG.

Not suitable for increasing static pressure.

[Problem to be solved by the invention]

In the conventional air purifier as described above, the air collected by the filter (7) of the dust collector (5) is blown out by the blower (4), so the filter (7) collects dust during use. There is a problem in that when the airflow becomes clogged, the air volume decreases.

This invention was made in order to solve the above-mentioned problems, and an object of the present invention is to provide an air volume control device for an air cleaner that can maintain an almost constant air volume even if the filter becomes clogged. shall be.

[Means to solve the problem]

An air volume control device for an air cleaner according to the present invention.

Multiple axial flow blowers are arranged so that their blowing directions are in series, and first and second pressure detectors are installed before and after the dust removal filter, and the number of blowers in operation is controlled according to the difference in output. It was designed to do so.

[Effect]

In this invention, since the number of operating axial blowers is controlled according to the pressure difference before and after the filter, the flow direction of each blower is not in series, and the quiet pressure is high.

〔Example〕

Figures 1 to 4 are diagrams showing one embodiment of the present invention.
The figure is a longitudinal side view, Figure 2 is a block circuit diagram, Figure 3 is a flowchart showing control operation, and Figure 4 is a static pressure/air characteristic curve diagram. Portions similar to those of the conventional device are designated by the same symbols. .

In Figure 1, (lυ to α) are axial blowers stacked vertically inside the main body (1), the top blower is placed near the air outlet (3), and the bottom blower is placed near the air outlet (3). A dust collector (5) is installed between the α side and the suction port (2), and a filter (7)
A first pressure sensor α and a second pressure sensor Kasumi are arranged before and after.

In Figure 2, (L[9 is a microcomputer (hereinafter referred to as a microcomputer).

(called a microcomputer), c PU (16A),
Memory (16B).

It has an input circuit (160) and an output circuit (16D), and the input circuit includes a pressure sensor α4. The output circuit (16D) is connected to the blower αυ~0.

Next, the operation of this embodiment will be explained with reference to FIGS. 3 and 4. In addition, Figure 3 is a memo of the microcomputer αe! J (
16B).

First, when the blower αυ is operated in step Qυ.

Indoor air is sucked in through the suction port (2), and the dust collector (5)
The clean air is collected through the air outlet (3) and blown into the room through the air outlet (3). At this time, the filter (7) is not clogged with dust, and the static pressure and wind pressure of the blown air are:
It is assumed that the static pressure P1 and the air volume q1 correspond to the intersection of the pressure loss curve L1 due to the filter (7) and the wind pressure/air volume curve W1.

Next, in step (to), the output Pa of the pressure sensor at the front of the filter (7) is read, and in step (to), the output Pb of the pressure sensor at the rear of the filter (7) is read. In step @, find the difference between output Pa and output Pb.

It is determined whether this has reached the first predetermined value KtK, and if not, the process returns to step (2), and steps (2) to
Repeat @. As the filter (7) becomes increasingly clogged, the pressure difference before and after the filter (7) becomes large, and this pressure difference reaches a first predetermined value of 1. this is.

This corresponds to the intersection of the pressure loss curve L2 and the wind pressure wind 1 curve W1 in FIG. 4, resulting in static pressure P2 and JjtL amount Qz. The process now proceeds to step (c), where it is determined whether the pressure difference has reached the second predetermined value of 2, and if it has not reached the second predetermined value, the blower a3 is additionally operated in step (1). At this time, the blowers α are rotated in the opposite direction to the blower aυ.

The blowing direction of the blower αυ, (I3 is in series, and its static pressure shifts along the pressure loss curve L2 in Fig. 4, and the blower αυ
When the wind pressure and air volume curves w2 for two vehicles υ and αL intersect, a quiet pressure P3 is reached. Now go back to step (2).

Steps (1) to (1) are repeated, filter (7)
The clogging further progresses, and the pressure difference reaches a second predetermined value of 2. This corresponds to the intersection of the pressure loss curve L3 and the wind pressure air volume curve W2, and becomes static pressure P4. Now, proceed to step (5) and additionally operate the blower 03.

At this time, the blower a3 is rotated in the same direction as the blower αυ, and the blowing directions of the blowers αυ~03 are in series, as shown by the arrow in Figure 1, and the static pressure shifts along the pressure loss curve L5. However, when the wind pressure and air volume curves W5 for the blowers 09 to 113 reach the intersection point, the pressure becomes quiet P5.

In this way, due to the increase in the number of air blowers aυ~(+moat) in operation, the characteristics as shown by curve B in Fig. 6 are not achieved, and the air blowing performance of the radial air blower is improved, allowing it to be brought closer to the eyes.

As is clear from FIG. 4, even if the static pressure fluctuates, there is little change in air volume, and desirable performance as an air cleaner can be obtained.

Note that the arrangement of the blower H-(13) is not limited to that in the embodiment, and any arrangement can be applied as long as the blowing directions are in series with each other.

〔Effect of the invention〕

As explained above, in the air volume control device for an air cleaner according to the present invention, a plurality of axial flow blowers are arranged so that their blowing directions are in series, and a first blower is placed before and after the dust removal filter.
By installing a pressure sensor and a second pressure detector, and controlling the number of blowers in operation according to the difference in their outputs, it is possible to use an axial flow blower, and even if the filter becomes clogged, the air volume can be maintained at a sufficient level. There is an effect that can be maintained almost constant.

[Brief explanation of the drawing]

1 to 4 are diagrams showing an embodiment of the X amount control device for an air cleaner according to the present invention, and FIG. 1 is a vertical side view, and FIG.
The figure is a block circuit diagram, Figure 3 is a flowchart showing control operation, Figure 4 is a static pressure/air volume characteristic curve diagram, Figures 5 and 6 are diagrams showing a conventional air purifier, and Figure 5 is a flowchart showing control operation. The vertical cross-sectional view and FIG. 6 are static pressure/air volume characteristic curve diagrams. In the figure, (2) is the inlet, (3) is the outlet, (7) is the dust filter, (10 to 0 is the axial blower, α◆ is the WJl pressure detector, and α is the second pressure detector. , αe is the control means (
microcomputer). In the two figures, the same reference numerals indicate the same or equivalent parts.

Claims (1)

[Claims] A blower is operated to suck indoor air, pass it through a dust removal filter, and blow it out into the room again, and the blower is composed of a plurality of axial flow blowers arranged so that the air blowing directions are in series. and a control means for providing first and second pressure detectors before and after the filter, inputting the outputs of the first and second pressure detectors, and controlling the number of the blowers in operation according to the difference therebetween. An air volume control device for an air purifier.