JPS5976515A - Method and apparatus for detecting change of filtering effect of filter apparatus for separating contaminant from gas flow - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for detecting a change in the filtration effectiveness of a filtration device for separating contaminants from a gas stream by indicating the change by means of a signal emitting means. The invention further relates to an apparatus for carrying out the method.

The detection principle known in the art for detecting the degree of clogging in air filtration equipment's filters was insufficiently sensitive, and a signal was not sent.

l The filtration device becomes relatively heavily clogged with contaminants.

This means that the filtration device may be operated with reduced filtration efficiency.

The object of the present invention is to overcome this problem and to achieve a method which provides a considerably sensitive detection function. A further object of the invention is to provide a relatively reliable device for carrying out the method according to the invention.

This is achieved by applying the features of claims 1 to 51:I'j to the method and device.

The present invention will be explained below based on the accompanying drawings.

The illustrated device includes a voltage transformer 1. and a filtration device 2 for separating contaminants from gases, in particular for separating harmful substances from smoke generated from welding equipment. Filtration device 2
is an automatically driven fan 3. and one or several removable filters 4 having a straw filtration cell 5 with one filtration stage. The fan 3 sucks the contaminated air 6 into the ionized sector 7 of the filtration device 2, in said sector the contaminated particles contained in the air stream are The particles are deposited in the negatively charged filtration cell 5.

A'I't Y- is stacked on the filtration cell 5''2 and continues)
As it increases, the ability of the right side to receive more particles increases.

After a certain period of use, the filtration effectiveness of the IIF filtration device becomes insufficient.

1 Before operating the filtration device for a long time in a state where the filtration efficiency has decreased, or before the filtration efficiency decreases to an unacceptable level, the filtration cell 5 is monitored by the detection transmitter 8. This detection transmitting device 8 is.

175, electronic control circuit 1/3 with inputs 0 and 11 to display the voltage across the overcell 5 (called resonant voltage)
9 (see Figure 3). In the condition of positive filtration effect, the voltage across the filtration cell 5 is between 110 and 124 V (see Figure 2), and the input resonator 9 is struck by the buzzer 12 and the lamps 13 &, m. 1 is not present, but fan 3's motor is connected to 11 voltage to the following relay, and 3 continues.''
Ru. 1r4 of the collector brake 1 (not shown) due to contaminants clogging the filter cell 5 and/or
If the voltage falls below 110V or exceeds 124V due to short-circuit effects in the filter cell 5 due to scratches and/or due to destruction of the ionization cord (not shown) of the ionized sector, the following will occur: occurs.

That is.

Foot - River Meanwhile ■ 5 < 1 [] 8.5V Continuous buzzer sound Continuous lighting fan motor contactor.

For example, open within 12 seconds; 108.5~110ν Intermittent buzzer sound 1i1i Continuously lit contactor does not open; 110~124V No buzzer sound, no light, contactor does not open; 124~125.5ν I folded > 125.5V Continuous beep, continuous lighting Fan motor contactor does not open;

For example, it opens within 12 seconds.

Opening of the contactor leading to the fan motor, i.e.

The fan 3 stops due to the temporary passage of a metal object that temporarily lowers the voltage between the filtration cells.
It is desirable to delay the number of seconds, for example 6 to 20 seconds, so that there is no delay. however.

If the voltage remains below 108.5V or 125.
If 5V remains negative, the fan 3 is stopped and can only be activated again after removing or cleaning the drained filter cell 5.

The table of voltage values and transmission shown in 1- naturally changes depending on the types of parts of the detection and transmission device 8 or other parts of the system.

Although the structure of the control circuit 9 may change, it is shown in FIG.
A practically useful and functionally superior device is illustrated.

The input resonant voltage is rectified and the voltage is divided and filtered.

The level is adjusted by δ111 by the trimmer partial pressure meter 14, and becomes the direct value of the cleanliness of the filter.

The aforementioned voltages are transmitted to the ratio amplifiers 15-18, and the voltage to the base (1) is formed by a stable 24V from unit 19.

Comparators 1G and 17 produce signals at voltages of 124v and ll0V, respectively, and comparators 15 and 18 produce signals at voltages of 125v and 10V, respectively.
．． It emits a signal at 5V and IO2, 5V. The comparators 16 and 17 actuate a pulse circuit 20 which supplies power to the triacs 21 and 21, which ignites the signal lamp 13. When either comparator 16 or 17 is activated, an intermittent optical and acoustic signal 19 is generated.

Comparators 15 and 18 block the activated pulse circuit 11.
Activate the -shi timer circuit 22, at which time the ++ff1 circuit cuts off the control current to the triac 23 after about 12 seconds, thereby opening the supply device contactor. Uniso 1-2
4 is made as a triac 23 tree circuit υJL,,
JIC resistors 25 and 26 provide a hysteresis of approximately 1 volt at levels of 124 volts and 110 volts, respectively, to provide well-defined functionality.

The method and device according to the invention are not limited to the exemplary embodiments described, but may be varied within the scope of the claims. 9 transmission is one lighting signal, one acoustic signal, one interrupting 1411 signal, or an appropriate combination of these - Type 1 type %

[Brief explanation of the drawing]

Figure 1 IJ Schematic 11 of a filtration device having a device according to the present invention
Fig. 111. FIG. 2 is a schematic diagram of voltage units. FIG. 3 shows a circuit diagram of the bond forming part of the device according to the invention. 1...Voltage transformer, 2...Filtering device, 3...Fan. 4...filter, 5...filtration cell. 83

Claims (1)

[Scope of Claims] (1) A method of detecting a change in the filtration effect of the filtration device 2 that separates contaminants from a gas flow by displaying the change using a signal transmitting means. Detecting a change in the voltage between the means 5 and transmitting a signal when a certain change in the voltage is detected. The signal emission occurs in the form of an optical and/or acoustic signal if the voltage goes around or falls below a certain limit value, and if said voltage goes around or falls below a certain limit value, (3) A signal is generated in the form of a signal to stop the fan 3 for sending the gas through the filter device. (4) A method according to any of the above claims, characterized in that the stop signal is emitted after a certain time delay from the time when said voltage reaches any stop signal value. , the signal emission is in the form of an intermittent light and/or sound signal, and continues when said voltage reaches a value higher or lower than the value necessary to emit the intermittent light and/or sound signal. (5) A change in the filtration effect of the filtration device 2 for separating contaminants from the gas flow is displayed by the signal transmission means. A device for implementing a method of detection by
A control circuit 9 in which the resonant voltage from the filtration cells 5 influences the signal generation comparators 15 to 1B for transmitting light, sound, or control signals in accordance with changes in the voltage between the filtration cells 5. characterized by.