JPH03169359A - Electric precipitator - Google Patents

Abstract

PURPOSE:To enhance user's convenience by successively adjusting high voltage output in matching relation to the contamination of a dust collecting part and eliminating erroneous operation such that machinery is stopped by the change of circumferential environment. CONSTITUTION:A dust collecting filter 7, a centrifugal force type fan 8 and a motor 9 are arranged to the flow passage from a suction port 5 to a blowoff port 6 within main bodies 1-4. An output detection circuit 15 detecting the output of a high voltage power supply 14 as voltage or a current is provided and a plurality of control stages are set and, when the output of the high voltage power supply reaches a set current or voltage value, the signal thereof is fed back to a control circuit 13 and the outputs of the high voltage power supply set to a plurality of values are controlled so as to successively become lower output characteristics. That is, high voltage output can be successively adjusted in matching relation to the contamination of a dust collecting part and, since erroneous operation such that machinery is stopped by the change of circumferential environment is eliminated, user's convenience can be enhanced.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to a method for preventing burnout accidents caused by surface leakage or arc discharge in an electrostatic precipitator.

[Conventional technology]

The conventional device (Japanese Utility Model Publication No. 15753/1983) takes safety measures such as detecting a change in the output current of the high-voltage power source of the electrostatic precipitator and cutting off the power source.

[Problem to be solved by the invention]

In the above-mentioned conventional technology, no specific consideration is given to accidental current changes, and for example, even when the humidity changes significantly in a short period of time, the function may stop, resulting in contamination of the equipment and damage to the surrounding environment. There was a problem that it was not possible to distinguish changes in

The present invention aims to distinguish between rapid changes in the surrounding environment and contamination of equipment, and further aims to provide an air cleaner that is safe and easy to use.

[Means to solve the problem]

In order to achieve the above purpose, the present invention includes a circuit for detecting the output of a high voltage power source and a signal received from the circuit so that the input of the high voltage power source can be controlled in multiple stages. Furthermore, when the lowest pattern of the set control output exceeds a certain period of time or reaches a certain voltage/current,
This stops the operation of the equipment and lights up the indicator lamp.

[Effect]

The present invention can adjust the high voltage output sequentially according to the level of dirt in the dust collecting section, and eliminates malfunctions such as equipment stopping due to changes in the surrounding environment, improving usability. Additionally, since it can be reset from any output level, performance can be restored at any time. [Example] An example of the present invention will be described below with reference to the drawings. In FIG. 1, the main body is composed of a front cover 1, a lattice panel 2, a frame 3, and a rear cover 4, and a dust collection filter 7 and a centrifugal fan are installed in the flow path leading to an inlet 5 and an outlet 6. 8
, motor 9 are provided. The dust collection filter 7 is housed in a filter frame 10 that can be slid and removed from the side surface of the main body.

Reference numeral 11 denotes a discharge wire 12 that applies an electric charge to the dust, and is a counter electrode plate. FIG. 2 shows a block circuit diagram. An output detection circuit 15 that detects the output of the high voltage power source 14 feeds back the output state of the high voltage power source 14 to the control circuit 13, and depending on the level, the high voltage power source 14 is The input to is controlled by the control circuit l3. The control mechanism will be explained using FIGS. 3 and 4. In Figure 3, I<Imz
is the range where there is no high-voltage power output that would cause a burnout accident, ■L
2≦Work≦Work t1 is the range where a burnout accident will occur if the worst conditions overlap, and Work≧Imx is the range where a burnout accident may occur in some cases even if the equipment is used normally. .

As long as the equipment is new, the output is within the range of I<Imz. However, each time equipment collects dust and becomes contaminated, creepage leakage and arc discharge occur, and the output current increases.
The output voltage V decreases. When the dust collection area gets dirty to a certain extent, the work will exceed Imt and enter the danger zone. Therefore, when the power reaches a preset value (V for voltage control), the control circuit 13 is output from the output detection circuit 15.
, and control the input so that the output of the high-voltage power supply 14 has a characteristic that passes through ■. Similarly, the dust collection area gets even more dirty.
= In (V = Va), the input is controlled so that the characteristic passes through ◎. Here, the capacity as an electrostatic precipitator has already been halved, so I = I c (V =
Vc) or ◎The characteristic operation time integration means integrates the time and when the set predetermined time t comes, the equipment is stopped, the status is displayed on the display lamp, and the user is informed of the equipment operation. Notify of abnormality.

Furthermore, if the user performs maintenance on the equipment even before the equipment is stopped, a reset mechanism is provided so that the functionality can be returned to its initial state. According to this embodiment, it is possible to apply a high voltage suitable for the dirt in the dust collection part of the electrostatic precipitator, which has a great effect on safety.

The actual machine specifications are shown below.

Workshop 1 = 200μA, I az = 100μAIA
=240μA, Is =180μA, Ic =80μA
Setting time t = 200 h [Effects of the Invention] According to the present invention, the high voltage output can be adjusted sequentially according to the dirt in the dust collecting section, and there is no malfunction such as equipment stopping due to changes in the surrounding environment, making it easy to use. will improve. Also,
Since it can be reset from any output level, performance can be restored at any time.

In addition, instead of the high-voltage power supply input limiting method, if a plurality of high-voltage resistors are provided on the output side of the high-voltage power supply and the connection circuit of the high-voltage resistors is switched according to the output of the detection circuit, the high voltage can be controlled by input control. The same effect as output adjustment can be obtained.

[Brief explanation of the drawing]

FIG. 1 is a longitudinal sectional view of an electrostatic precipitator according to an embodiment of the present invention.
FIG. 2 is a basic circuit block diagram of the present invention, FIG. 3 is a characteristic diagram of the high voltage power supply arranged in FIG. 1, and FIG. 4 is a flowchart of the present invention. 1...Front cover, 2...Lattice panel, 3...Frame, 4...Rear cover, 5...
...Suction port, 6...Blowout port, 7...Dust collection filter, 8...Centrifugal force fan, 9...Motor, 10
...Filter frame, 11...Discharge wire, 12...Counter electrode plate, l3...Control circuit, 14...High voltage power supply,
1st figure lθ 2" 2 [21 tq 3rd figure 4 figure

Claims (1)

[Claims] 1. A dust collection filter (7), a centrifugal fan (8), and a motor (9) are installed in the main body from the suction port (5) to the air outlet (6).
) in an electrostatic precipitator, which is arranged in a flow path leading to An output detection circuit (15) that detects voltage or current is provided, and there are multiple control stages, and when the output of the high voltage power supply reaches a set current or voltage value, the signal is sent to the control circuit (15).
3) An electrostatic precipitator characterized in that the outputs of the plurality of high-voltage power supplies are controlled so as to sequentially have lower output characteristics by feeding back to the above. 2. If the lowest characteristic among the output characteristics set in claim 1 continues for a certain period of time, or
When the set value is reached, all high-voltage power input and motor input are stopped, and the need for equipment maintenance is indicated by lighting a lamp, etc. After maintenance, the system returns to the initial state by resetting. An electrostatic precipitator characterized by: