JPH0235947A - Electrostatic precipitator - Google Patents

Abstract

PURPOSE:To eliminate an unpleasant feelings due to the smell of ozone and useless electric power consumption by controlling a charging device and an electric fan in response to the information detected by means of a sensor which is provided near a suction port of a casing and adapted to detect the smoke density and/or smell intensity. CONSTITUTION:An electric fan 16 provides an air flow through an air passage from a suction port 13 of a casing 12 to an outlet port 14, while, at a charging device 10, an electric discharge is effected to impart a charge to the suspended dusts in the air having been moved by means of the electric fan 16. And further, the dusts having been charged at the charging device 10 are attracted to a dust collector member 20, while sensors 23, 24 disposed at the suction port 13 of the casing 12 detect the smoke density and/or smell intensity. And at a control device 22, the charging device 10 end electric fan 16 are controlled in response to the information detected by the sensors 23, 24. As a result, deodorization operations can be carried out without giving an unpleasant feelings due to the smell of ozone, while a high voltage being always applied between charge electrode plates and discharge wires, wherein useless electric power consumption being avoided.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to an electrostatic precipitator that charges dust in the air and collects and deodorizes the charged dust and odor by adsorbing the charged dust and odor.

[Prior Art] In recent years, electrostatic precipitators have come into use that remove floating dust, floating microorganisms, cigarette smoke, etc. contained in indoor air, sterilize and deodorize it, and keep indoor air clean. This type of electrostatic precipitator is disclosed, for example, in Japanese Patent Application Laid-Open No. 55-22390.

FIG. 7 shows the structure of a conventional electrostatic precipitator, and is a schematic configuration diagram with a charging section (10) and a dust collecting section (20) in cross section.

In Fig. 7, (12) is a casing made of an insulator, (13) is an air suction port formed on the front surface of the casing (12), and (14) is an air intake port formed on the top surface of the casing (12>). It is the exit.

(10) is a charging section, and (20) is a dust collection section, which are housed in the casing (12).

(15) is a fan motor, and (16>) is a fan driven by the aforementioned motor (15). This fan motor (15) and fan (16) are connected to the casing (12).
) and constitutes an electric fan. Note that (17) indicates the air flow sucked in from the suction port (13>).

The charging section (10) is constructed as shown in FIG. FIG. 8 is an exploded perspective view showing the charging section (10) of the conventional electrostatic precipitator shown in FIG.

In the figure, (2) is parallel to the air flow (17) shown in FIG.
1) is a discharge wire connected to the opposite potential to the charged electrode plate (2) and placed at the center between the charged seed plates (2). Note that the discharge wire (1) has one end connected to the discharge wire connection plate (5a).
, connect the other end to the discharge wire (a spring (1) that maintains the tension
4) is attached to the discharge wire connection plate (5b).

The dust collecting section (20) has the same polarity as the charged electrode plate (2), and is arranged behind the charged electrode plate (2) and the discharge wire (1).

Next, the operation of the electrostatic precipitator configured as described above will be explained.

Dirty airflow (17) containing floating dust, floating microorganisms, cigarette smoke, etc. is passed through the suction port (13) of the casing (12) through a charged electrode plate (2) and a discharge wire (1). Department (
10). A high voltage is applied between the charged electrode plate (2) and the discharge wire (1), and the discharge wire (1) is discharged by this high voltage, and the dust in the air contaminated by this discharge is removed from the discharge wire. (1) is charged to the same polar potential.In the process of passing through the dust collection section (20), this charged dust is adsorbed by the dust collection section (20), which is set at the opposite potential to the discharge wire (1). Dirty airflow containing airborne dust, airborne microorganisms, cigarette smoke, etc. (17
) becomes clean air and is discharged into the room from the air outlet (14). In addition, the dust collection section (20) is constructed with a filter incorporating activated carbon, etc., and performs deodorization at the same time as dust collection.

[Problem to be solved by the invention] Since the conventional electrostatic precipitator is configured as described above, a high voltage is always applied between the charged electrode plate (2) and the discharge wire (1). Thereby, the dust is charged, and the charged dust is adsorbed to the dust collecting section (20).
) Deodorizing operation is performed using activated carbon etc. incorporated in the system. For this reason, e-viruses in the indoor air are removed, and even when only deodorizing operation is desired, ozone is generated because high voltage is applied between the charged electrode plate (2) and the discharge wire (1). However, if operated for a long time, the ozone odor may cause discomfort to people in the room, and furthermore, high voltage is applied between the charged electrode plate (2) and the discharge wire (1), which wastes power. I rarely did.

Therefore, the present invention has been devised as an electric collector that enables deodorizing operation without causing discomfort due to ozone odor and without consuming unnecessary power by constantly applying high voltage between the charged electrode plate and the discharge wire. The objective is to provide dust equipment.

[Means for Solving the Problems] An electrostatic precipitator according to the present invention uses an electric fan to generate an air flow in a ventilation path from an inlet to an outlet of a casing, and increases smoke concentration and concentration near the inlet of the casing. Alternatively, a sensor for detecting odor concentration is provided, and the charging device and the electric fan are controlled according to information detected by the sensor.

[Effect] In this invention, the smoke concentration and/or odor of the air)
When the opening exceeds a certain temperature, this is detected and input to the control device, which controls the power supplied to the charging section and the electric fan to perform dust collection operation, and also controls the smoke density and/or Odor) If the opening level falls below a certain level, dust collection operation will be stopped. As a result, operation is performed according to the state of air pollution, so no unnecessary electrical discharge occurs in the charged part during deodorizing operation, so no ozone is generated due to discharge, there is no unpleasant ozone odor, and there is no waste. It does not consume a lot of electricity.

[Embodiment] FIG. 1 is an overall configuration diagram showing a charging section (10) and a dust collecting section (20) in cross section, showing an electrostatic precipitator according to a first embodiment of the present invention. In addition, in the drawings, the same reference numerals and symbols as in the conventional example indicate the same or corresponding parts as the constituent parts of the conventional electrostatic precipitator.

In the figure, (12) is a casing made of an insulator in which an air inlet (13) and an air outlet (14) are formed.
Inside this casing (12) are a charging unit (10), a dust collecting unit (20), a fan motor (15), and a fan (16).
) is housed therein, and these structures are basically the same as the structure of the electrostatic precipitator shown in the conventional example.

Further, (23) is a smoke sensor for detecting the smoke concentration of the air flow (17), and (24) is an odor sensor for detecting the odor concentration. The smoke sensor (23) and odor sensor (24) are arranged near the air intake port (13). (22) is a control I device, into which signals detected by a smoke sensor (23) and an odor sensor (24) are input, and a fan motor (15) and a charging unit (10) are controlled according to the signals.
It controls the power supply to the

The detailed configuration of the control device (22) is shown in FIG. 2. FIG. 2 is a block diagram of a control device constituting an electrostatic precipitator according to a first embodiment of the present invention.

(22a) is a central processing unit of a microcomputer (hereinafter abbreviated as IrCPUj), and (22b) stores a program and preset data for controlling power supply to the fan motor (15) and charging unit (10). (22c) is an input circuit that inputs the signals detected by the smoke sensor (23) and odor sensor (24) to the CPU (22a>), and (22d) is an input circuit that inputs the signals detected by the smoke sensor (23) and odor sensor (24) to the CPU (22a>). ) and charging section (10
) is an output circuit that adjusts the power supply to the these are,
The charging unit (10) and the fan motor (1) are activated according to the information detected by the smoke sensor (23) and the odor sensor 4j (24).
5) constitutes a control device (22) consisting of a microcomputer.

Next, regarding the control operation of the electrostatic precipitator of this example,
This will be explained using the flowchart of the main program conceptually shown in FIG.

The smoke sensor (23) detects the smoke concentration in the indoor air, the detection signal is input to the control device (22), and in step S1, the CPU (22a) in the control device (22) controls the smoke concentration N set in advance. In comparison, when the detected concentration from the smoke sensor +1 (23) exceeds the preset smoke concentration N, power is supplied to the charging unit (10>) in step S2, and the fan motor (10) is supplied with power in step S3. 15) to perform dust collection operation and deodorization operation, and process the routine from step S1 to step S3 until the indoor air is purified.

When the indoor air is purified and the smoke concentration of the indoor air becomes equal to or less than the preset smoke opening degree N in step S1, the power supply to the charging unit (10) is stopped and the dust collection operation is stopped in step S4. . In step S5, the CPU (22a) in the control device (22) compares the odor concentration port preset in the memory (22b) with the output of the odor sensor (24) that has detected the opening degree of the odor in the indoor air. Odor sensor 4
When the detected concentration from the no (24) exceeds the preset odor concentration n, power is supplied to the fan motor (15) in step S6, and if power is already being supplied, the power is continued as is. Supply continues and deodorizing operation is started or continued. That is, if the detected concentration from the odor sensor (24) necessarily exceeds the preset odor concentration n, the routine from step S5 to step S6 is processed.

When the indoor air is purified and the odor concentration of the indoor air becomes equal to or less than the preset odor concentration n in step S5, the power supply to the fan motor (15) is stopped and the deodorizing operation is stopped in step S7.

The above describes the operating state of the electrostatic precipitator when cigarette smoke or the like is generated indoors. However, if only odor is generated, the fan motor is activated from step S1 to step S4, and then from step S5 to step S6. Deodorizing operation is started by starting power supply to (15), and the routine from step $5 to step S6 is processed.

When the indoor air is purified and the odor concentration of the indoor air becomes less than the preset odor concentration n in step S5, the power supply to the fan motor (15) is stopped and the deodorizing operation is stopped in step S7.

As explained above, if smoke is generated, dust collection operation and deodorization operation are performed at the same time, and if only odor is generated or remains, only deodorization operation is performed. It is possible to drive accordingly. For this reason, since the power supply to the charging unit (10) is stopped when only deodorizing operation is being performed, a large amount of ozone is generated and people in the room do not feel uncomfortable due to the ozone odor. It doesn't consume electricity either.

FIG. 4 is an explanatory diagram showing the relationship between the characteristics showing changes over time in the smoke and odor concentrations in the air during indoor dust collection and deodorization operations, and the operating state of the electrostatic precipitator.

As shown in the figure, smoke concentration has a greater rate of decline over time than odor concentration. Therefore, even if the dust collection operation is stopped when the smoke concentration inevitably falls below the preset smoke concentration N, the deodorization operation continues thereafter. A second embodiment of the present invention takes advantage of this characteristic.

FIG. 5 is an overall configuration diagram showing an electrostatic precipitator according to a second embodiment of the present invention, with the charging section (10) and the dust collecting section (20> being shown in cross section. Only the differences from the first embodiment will be explained.

In the first embodiment, there were two types of sensors for detecting the degree of pollution in the air: a smoke sensor (23) and an odor sensor (24), but in this second embodiment, only the odor sensor (24) was provided. It's something.

The other 474 components are the same as those in the first embodiment except for the program stored in the memory (22b) in the control device (22), so their explanation will be omitted.

The control operation of the electrostatic precipitator of the second embodiment will be explained using the flowchart of the main program conceptually shown in FIG.

The odor concentration of the indoor air is detected by the odor sensor (24), the detection signal is input to the control device (22), and step 3
In step 11, the CPU (22a) in the control device (22) compares the odor concentration n determined by the odor sensor (24) with the odor concentration n determined by the odor sensor (24). If it exceeds the limit, power is supplied to the charging unit (10) in step 312, and then power is supplied to the fan motor (15) in step 313 to start dust collection operation and deodorization operation.

In step 314, is the CPU (22a) tied? The dust collecting operation and the deodorizing operation are continued until T reaches the set time t1. When the time reaches ↑1, the power supply to the charging unit (10) is stopped in step 315, the dust collection operation is stopped, and only the deodorization operation is continued. Step 3
At step 16, the odor concentration detected by the odor sensor (24) is compared with a preset odor concentration n, and if the odor concentration still exceeds the preset odor concentration n, the deodorizing operation is continued. When the indoor air is purified and the odor concentration becomes equal to or less than the preset odor concentration n, the power supply to the fan motor (15) is stopped in step 317, and the deodorizing operation is stopped.

In this way, when the dust collection operation and deodorization operation are started in step S12 and step S13, as shown in the characteristics shown in FIG. Therefore, the time required for the smoke concentration to be sufficiently reduced by the dust collection operation in step 314 is set, and during that time, the dust collection operation and the deodorization operation are performed. Further, after the dust collection operation is stopped, if the odor has not been completely removed, only the deodorization operation is continued.

Since no power is supplied to the charging unit (10) when only deodorizing operation is being performed, a large amount of ozone is not generated and people in the room are not made to feel uncomfortable due to ozone odor, and there is no wasted power consumption. .

By the way, the sensors for detecting the smoke concentration and/or odor concentration disposed at the suction port of the casing (12) in the above embodiment are the smoke sensor 1 (23) and the odor sensor (24) or the odor sensor (24). If the electric fan is constantly driven, the smoke sensor (23) can be used to determine the opposite situation to the odor sensor (24) in the above embodiment. Accordingly, the sensors for detecting the smoke concentration and/or odor concentration when implementing the present invention include a smoke sensor (23) and an odor sensor (23).
4>, it can be a smoke sensor (23) or an odor sensor (24).

[Effects of the Invention] As explained above, the electrostatic precipitator of the present invention includes an electric fan that generates an air flow in the air passage from the suction port to the discharge port of the casing, and an electric dust collector that generates an air flow in the air moved by the electric fan. a charging section that charges floating objects by electrical discharge; and a dust collecting section that adsorbs dust charged by the charging section, and detects smoke concentration and/or odor concentration at the suction port of the casing. A control device controls the charging section and the electric fan according to information detected by the sensor. Therefore, the smoke concentration and/or odor concentration of the indoor air is detected by each sensor, the signal of the detected concentration is transmitted to the control device, and the power supply to the charging unit and the fan motor is controlled based on the signal. Therefore, depending on the indoor air pollution status, it is possible to automatically select, start, or stop simultaneous dust collection and deodorizing operation, or only deodorizing operation. By stopping the power supply to the charged section that is opened during deodorization operation, the discharge of the charged section is stopped, which eliminates the discomfort caused by ozone odor to people in the room and eliminates unnecessary power consumption. There is.

[Brief explanation of the drawing]

FIG. 1 is an overall configuration diagram showing an electrostatic precipitator according to a first embodiment of the present invention, FIG. 2 is a block diagram of a control device that controls the electrostatic precipitator according to a first embodiment of the present invention, and FIG. The figure is a flowchart of the main program conceptually showing the operation of the electrostatic precipitator according to the first embodiment of the present invention, and Figure 4 shows the time course of smoke and odor concentrations during indoor dust collection and deodorization operations. An explanatory diagram showing the relationship between changing characteristics and the operating state of the electrostatic precipitator, FIG. 5 is an overall configuration diagram showing the electrostatic precipitator according to the second embodiment of the present invention, and FIG. 6 is the second embodiment of the electrostatic precipitator according to the present invention. A flowchart of the main program conceptually showing the operation of the electrostatic precipitator of the embodiment, FIG. 7 is a schematic configuration diagram showing a conventional electrostatic precipitator with the charging section and the dust collection section in cross section, and FIG. This is an exploded perspective view showing the charging section of the conventional electrostatic precipitator shown in FIG. In the figure] ○: Charged part 12: Casing, 13: Suction port, 14: Air outlet, 15: Fan motor,
16: Fan, 20: Dust collection section, 22: Control device, 23: Smoke sensor, 24: Odor sensor. In addition, in the figures, the same reference numerals and the same symbols indicate the same or equivalent parts. 10: Charging section 12: Casing 15: Fan motor 16: Fan 20: Dust collecting section 23: Weir sensor

Claims (1)

[Scope of Claims] An electric fan that generates airflow in an air passage from an inlet to an outlet of a casing; a charging unit that charges floating objects in the air moved by the electric fan by electrically discharging them; a dust collecting section for adsorbing dust charged by the charging section; a sensor for detecting smoke concentration and/or odor concentration disposed at the suction port of the casing; and a dust collecting section for adsorbing dust charged by the charging section; An electrostatic precipitator characterized by comprising: a control device for controlling a part and an electric fan;