JPH0352656A - Air cleaner - Google Patents

Abstract

PURPOSE:To enhance durability of an apparatus by equipping both a concn. detector of smoke and a command means of voltage to the part wherein cleaning of air is performed. CONSTITUTION:A command means 5 of voltage is constituted of a voltage amplifier 6 and a limiter 7. When a concn. detector 4 of smoke outputs a concn. signal of voltage value comparative to the concn. of smoke, the voltage amplifier 6 receives it and holds positive coefficient. Voltage is rectilinearly amplified by the voltage amplifier 6 and an amplified voltage signal proportional to the concn. of smoke is output. The output signal of the voltage amplifier 6 is sent to the limiter 7 and the upper limit value is regulated in the limiter 7. Change in voltage is performed in a voltage region wherein spark discharge is not caused in an ionization part 1 and a dust collecting part 2. The voltage signal output from the command means 5 of voltage is inputted to the control terminal of a high voltage generator 3. The high voltage generator 3 converts voltage regulation according to the output voltage signal. This signal is output to the ionization part 1 and the dust collecting part 2. Thereby the service life is prolonged.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a variable capacity air cleaner whose dust collection capacity changes depending on the state of air pollution.

(Prior art) Most electrostatic deposition type air cleaners that have an ionization section and a dust collection section are designed to apply a DC high voltage of a predetermined value determined at the time of design. In order to maximize performance, it is customary to set the voltage level close to the allowable value. <Problems to be Solved by the Invention> The conventional air purifier described above has problems due to high voltage continuous discharge.
Inevitably, ozone was generated, and in some cases, the ozone concentration could become high and produce a strange odor. Furthermore, continuous high-voltage discharge causes spark discharge and buzzing, causing deterioration of both the Z ionization section and the dust collection section, resulting in some problems regarding durability.

In order to address these problems, the present invention was developed with the aim of improving the problem. The purpose is to operate at a capacity corresponding to the degree of pollution by changing the DC high voltage value, thereby eliminating ozone odor and extending the life of the equipment.

(Means for Solving the Problems) In order to achieve the above object, the present invention has an ionization section (1) and a dust collection section (2), as is clear with reference to the embodiments shown in the attached drawings. In the air purifier, a smoke concentration detector (4) is provided at a location where air purification is performed to detect the concentration of smoke dispersed in the air; and the smoke concentration detector (4).
receives the concentration signal output by the output concentration signal and outputs a reference voltage signal for the average concentration value, as well as a voltage signal that increases or decreases linearly with a positive coefficient and has a saturation value according to changes in the height of the output concentration signal. and a voltage command means (5) that outputs a voltage signal of the voltage command means (5), and generates a reference value and a proportional output voltage of a value increased or decreased with respect to the reference value according to the output voltage signal of the voltage command means (5). ) and a high voltage generator (3) that supplies the dust collector (2). (Function) When the smoke concentration is high and the air pollution level is progressing, the applied DC high voltage is increased to increase the dust collection capacity, while when the smoke density is low and the air pollution level is decreasing. Since this system lowers the DC high voltage and reduces the dust collection capacity, the amount of onzo generated is extremely small when the smoke concentration is low, making it possible to suppress the indoor ozone concentration and eliminate strange odors. Furthermore, when the smoke concentration is low, the durability of the device can be increased by lowering the applied DC high voltage.

The applied voltage in this case may not be stepless but may be a plurality of stepwise voltages.

(Example) Hereinafter, an example of the present invention will be described based on the attached drawings. In FIG. 1, (1) is an ionization part, (2) is a dust collection part, and the ionization part (1) is located in the air flow path in the casing.
) on the windward side.

(3) is an attached high voltage generator, which is a power supply device that applies a DC high voltage to both parts (11).
The anode plate of the dust collecting section (2) has two power supply circuits that provide a DC voltage of 2KV, and each output voltage is controlled to increase or decrease below the saturation value determined at the time of design. For example, a variable voltage type is used that can increase or decrease the high voltage on the secondary side by changing the primary tap of the transformer or increasing or decreasing the resistance of the series impedance on the primary side. The air purifier having the above structure includes the high voltage generator (3).
), this voltage control system is composed of a smoke concentration detector (4), a voltage command means (5), and the high voltage generator (3). Ru. The smoke concentration detector (4) is installed in conference rooms, work rooms, and other rooms that require air purification by this air purifier to detect the concentration of smoke dispersed in the air, especially cigarette smoke. For example, a gas-sensitive element made of a composite of a carbon-based resistor and a resin is used in a sensor (4K),
Since this element causes a change in resistance by adsorbing the force of smoke, it is possible to detect the smoke concentration (1) as a change in voltage or current. It can replace the detector. Next, the voltage command means (5) is composed of, for example, a voltage amplifier (6) having a linear amplification characteristic and a limiter (7) that limits the upper limit of the output of the converter (6). When the detector (4) outputs a concentration signal with a voltage value to be compared with the smoke concentration, the voltage amplifier (6) receives this and linearly outputs a voltage value with a positive coefficient.
) to perform voltage amplification and output an amplified voltage signal proportional to smoke density. In this case, the gain is set such that a reference voltage signal is output so that high voltage determined at the time of design specific to the ionization section (1) and dust collection section (2) is applied to the ionization section (1) and the dust collection section (2) for the average concentration value of smoke. Let's decide.

The output signal of this voltage amplifier (6) is transmitted to the subsequent limiter (7).
An upper limit value is defined in ), and the voltage is changed in a voltage range in which spark discharge does not occur in the ionization section (1) and the dust collection section (2).

The voltage signal output by the voltage command means (5) is inputted to the control terminal of the high voltage generator (3), and the high voltage generator (3) adjusts the voltage conversion rate according to the output voltage signal. In response to changes in smoke concentration, a DC high voltage is generated in a low range for low concentrations and a high range for high concentrations, and is output to the ionization section (1) and dust collection section (2), respectively. (
(See Figure 2). In addition to using the above-mentioned analog amplifier as the voltage command means (5), it is of course possible to adopt a configuration in which electronic control is performed digitally using a CPU of a control device that controls the operation of the air cleaner.

The air purifier constructed in this way constantly measures the smoke concentration in the target area during operation, and when the measured value is low, it is detected that the air pollution level is low and the ionization part (1) and dust collection part ( 2) The DC high voltage applied to 2) is lowered to operate with reduced dust collection ability, and as a matter of course, the voltage drop eliminates the generation of ozone.

On the other hand, when the measured value is high, it means that the degree of air pollution is progressing, and as a result, the applied DC high voltage is automatically increased according to this state, and air purification is promptly performed. Note that it is also a preferable means to slightly increase the airflow flowing through the ionization section (1) and the dust collection section (2) in conjunction with the increase in the applied DC high voltage to a high range.

(Effects of the Invention) As detailed above, the present invention automatically lowers the applied DC high voltage when the degree of air pollution is low and the smoke concentration is low, so the discharge current is reduced and the capacity is maintained properly. At the same time, almost no ozone is generated, and as a result, the indoor ozone concentration is reduced and discomfort caused by strange odors can be eliminated.

When the smoke concentration increases and the contamination state progresses, the applied DC high voltage is increased to increase the dust collection ability, and as a result, the air can be cleaned quickly.

In this case, the applied DC high voltage is not increased above a predetermined value, so safety is sufficiently ensured.

Furthermore, since the voltage applied to the ionization section (1) and the dust collection section (2) is controlled high and low, high voltages are no longer constantly applied even when air pollution has not progressed that much, and durability is improved. As is clear from the principle that is proportional to the power of the applied voltage, it also has the effect of extending the life of the device.

[Brief explanation of drawings]

Fig. 1 is a schematic structural diagram according to an embodiment of the present invention, and Fig. 2 is a diagram showing the relationship between smoke concentration and DC high voltage. (11... Ionization section, (2)... Dust collection section, (3)... High voltage generator, (4)... Smoke concentration detector, (5)... Voltage command means. Figure 1 Smoke density (IIm)

Claims (1)

[Claims] 1. In an air purifier having an ionization section (1) and a dust collection section (2), a smoke concentration detector (4) that is installed at a location where air purification is performed to detect the concentration of smoke dispersed in the air. and,
receiving the concentration signal output from the smoke concentration detector (4) and outputting a reference voltage signal for the average concentration value;
a voltage command means (5) for outputting a voltage signal that linearly increases or decreases with a positive coefficient and has a saturation value in accordance with changes in the level of the output concentration signal; and a high voltage generator (3) that generates a proportional output voltage of a reference value and a value increased or decreased with respect to the reference value and applies it to the ionization section (1) and the dust collection section (2) accordingly. An air purifier featuring