JPS5892441A - Method for controlling automatic winding-up of filter material in air filter - Google Patents

Abstract

PURPOSE:To enhance filtering efficiency to a large extent, by operating a winder of a rolled filter material according to a wind amount signal and the operation value of dust concn. of air to be treated to eliminate wastefulness of the filter material. CONSTITUTION:The wind amount signal of a blower system is taken out by a wind amount signal sending device 1 and the dust concn. signal of air to be treated by a concn. signal sending device 2. These both signals are subjected to integration treatment by an operation treatment device 3 and, when the operated value reaches the filtering torelance total wind amount set value of a filter material, a filter material winder 4 is operated to carry out one winding of the filter material in a definite amount. Hereinafter, this operation is similarly carried out repeatedly.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for automatically winding up a filter medium 9 in an air conditioning air filter that filters and collects dust in the air using a roll-shaped filter medium that is gradually wound up.

Conventionally, this type of filter medium automatic winding control method includes a differential pressure detection method and a timer setting method. The former differential pressure detection method is a method in which a differential pressure detector detects the degree of clogging of the filter medium due to collected dust and winds up the filter medium.In this case, the differential pressure detector is installed at an appropriate location. Due to the capacity of the air conditioner, changes in differential pressure are generally small, so
It is difficult to accurately detect the degree of clogging with a differential pressure detector and control the winding, and it is unreliable and inaccurate. On the other hand, the latter timer setting method is a method in which the filter material is wound up at preset intervals using a timer. However, in air conditioning systems, the amount of air blown is rarely kept constant, and generally the air amount of a blower or other device is controlled according to the set amount in order to reduce power consumption. Air flow rate often changes constantly. For this purpose, if the time for winding the filter media is set at regular intervals using a timer, during the period 1r- when the amount of air blown per unit time is high,
The problem is that the filter media becomes clogged so quickly that the pressure loss becomes higher than the predetermined level before the timer set time is reached, which reduces the filtration efficiency and increases the power cost of the blower. On the other hand, when the amount of air blowing per unit time is low, the rate of clogging of the filter medium is slow, so even though the filter is in a usable state with low pressure loss, the timer setting time is reached and the filter is There was a problem that the filter media was used wastefully, resulting in poor usage efficiency and being uneconomical.

The method of the present invention has been developed in view of the above circumstances, and is completely different from the conventional differential pressure detection method and timer setting method. The purpose is to eliminate waste and significantly increase the efficiency of using the filter media, and it uses the air volume signal of the air blowing system that blows air to the air filter using the roll-shaped filter media and the dust content of the air being blown to be treated. The concentration signal is taken out, and the air volume signal and the concentration signal are integrated by a calculator, etc., and when the value reaches the set value of the total permissible air volume for filtering, the end-of-life monitoring machine is operated to wind up a certain amount of the filter material. It is characterized by a method of performing Yu.

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

FIG. 181 is a schematic block diagram of the basic equipment for carrying out the method of the present invention, in which the air volume signal of the ventilation system is taken out by the air volume signal transmitter 1, and the dust concentration signal of the air to be treated is taken out by the concentration signal transmitter 2. The air volume signal and concentration signal are integrally processed by an arithmetic processor, and when the value reaches the filtration permissible total air volume setting value of the filter media, the filter media winding machine is operated to maintain a constant flow rate of the filter media (not shown). Take up the amount once. and,
After winding up the filter medium 9, the air volume signal and concentration signal from the air volume signal transmitter 1 and the concentration signal transmitter 2 are again integrated by the arithmetic processor, and the winding of the filter medium is repeated in the same manner as described above.

FIG. 2 is a block diagram of an example showing a specific configuration of an apparatus for implementing the method of the present invention, in which the air volume from the blower of the air blowing system is controlled by the air volume control signal transmitter 11 and ζ-2.
A 0 mA airflow control signal is taken out, and a 14-20 mA concentration signal is taken out from the gravimetric dust concentration meter 12y, and the dust concentration of the air to be treated is blown from the blower of the blowing system. Convert from analog to digital with A-D converter 15, calculate the pulse with frequency division I11B, and send it to counter 15C, +
The counter Be counts the number of pulses (stepping signal operation), that is, performs integration processing. Thereafter, when the value reaches the set value of the total permissible air volume for filtering the filter medium, the ura material winding machine 14 is operated to wind up a certain amount of the filter medium (not shown) once. Then, after the end of the filter medium inspection is completed, a winding completion signal is fed back to the counter 15c by the first winding machine koji, and the same integral process as described above is started again, and the value is The filter material is wound up repeatedly each time the value reaches the set value. or.

- A filter medium end signal is sent every time to the signal display 15 to display signals such as the end of filter medium winding and overload.

Since the method of the present invention is performed as explained above, it is completely different from the conventional differential pressure detection method and timer setting method, and allows accurate automatic end-of-life control of the filter medium at all times.

In addition to improving filtration efficiency, it also eliminates waste of filter media and greatly increases the efficiency of filter media usage.

In addition, operating costs such as power costs for blowers can be reduced. Furthermore, since a signal of the dust concentration of the air to be treated is extracted, the filter can be controlled according to the proportion of dust in the air, further improving the efficiency of use of the filter.

[Brief explanation of the drawing]

FIG. 1 is a schematic block diagram of an apparatus for implementing the method of the present invention, and FIG. 2 is a block diagram showing a specific configuration of the apparatus. 1... Air volume signal transmitter, 2... Dust concentration transmitter, U... Arithmetic processor Patent applicant Tori Jidosha Kogyo Co., Ltd. Representative 1ii11 Toshio Ta

Claims (1)

[Claims] Air filter using roll-shaped filter media Kpm The air volume signal of the air blowing system and the dust concentration signal of the air to be blown are taken out, the air volume signal and the concentration signal are integrated, and the value is the value of the filter media. A method for automatically winding up a filter medium in an air filter, which comprises operating a winding machine to wind up a certain amount of the filter medium when the total permissible air volume for filtration reaches a set value.