SU575116A1 - Device for automatic control of air filters - Google Patents

Description

The invention relates to devices for controlling air filters, which consist of one as well as several sections, and can be used in the chemical, metallurgical, energy and other industries. Devices for automatic control of air filters are known. contains a filtering material contamination sensor that, through a time relay, acts on the actuating mechanisms installed on the filter and vacuum lines I 1 and 2. It is also known a device for controlling air filters, comprising a membrane, a rod and a discrete control unit 13. In this device, depending on the pressure in the purge air chamber, the membrane changes its position, which by means of a rod is transferred to a contact group (both pneumatic and electric contact devices consisting of two contacts are driven) which controls the filter. The absence of impulse lines, which, as a rule, are clogged with manometers, differential manometers, and blocks of analog signal conversion (after differential manometer) to discrete, makes this device simple and convenient to maintain. The device has a number of disadvantages. First, it does not give complete and reliable information about the filter operation, since the pressure in the purge chamber only indirectly characterizes the filtration process, and the contact group adjusts only to two limits — the beginning and the end of regeneration, i.e. she | designed for filter operation in normal mode. Under actual production conditions, often violation of technological regimes occurs. For example, the integrity of the fabric filter material is compromised, which results in the emission into the atmosphere of valuable, and in some cases, hazardous dust to human health. A so-called filter closure occurs due to faulty regenerating devices, in particular electromagnetic valves of filters with pulse blowing, when an increase in filter resistance leads to disruption of the operation of the main technological equipment preceding the filters.

Secondly, the execution of a discrete control unit on pneumatic and electrical contacts does not ensure its reliable operation in dusty environments, as is the case in dust collection shops. ,

The goal of the invention is to obtain reliable and complete information about the operation of the filter, ensure the reliability of the device and improve the quality of control.

To this end, it is equipped with regenerating disks connected to the hollow stem and forming the membrane base placed between the dusty and purified gas chambers, and the discrete control unit is made contactless in the form of generator sensors with adjustment plates of different lengths mounted on an oly stem.

The device is shown in the drawing. It consists of a rigid membrane 1, a hollow rod 2, a comb 3, guide lines 4, adjustment plates 5, fixing bolts 6, and generator plates; sensors 7, the output unit 8, the control device 9, the regenerated IUVD1X disks 10, the rubber tube 11, the elastic element 12.

The device works as follows.

The membrane 1 is placed between the chambers of the purified 13 and 14 dusty gas. Depending on the dust accumulated on the filter cloth, the filter resistance and, consequently, the pressure drop between the chambers changes. Each value of the differential pressure dP corresponds to a certain position of the membrane. The movement of the membrane is transmitted by means of a rod 2 to a comb 3 with four guides 4. On the guides 4 there are installed adjusting plates 5 (A, B, C and D). Their position is fixed with bolts 6 in accordance with the following pressure drop values. dR j

ARmax (A) the filter is completely locked;

(B) - the beginning of regeneration, (B) - the end of regeneration;

(D) - the fabric of the sleeve is torn,

The adjusting plates in their movement are included in the gap of the generator sensors 7, which can be used as standard sensors like BK (VK-A) of the device D-J, which serve as contactless

travel or end switches; In addition, the insertion of plates into sensor gaps (like from plates, if they are in a gap that depends on the position of the diaphragm), 1 oscillations of the sensor generators break down, the sensors trigger, and the output block b receives signals that are amplified and It is transmitted to the control device 9, which performs signaling, blocking, protection and control filtering.

In the process of work, due to adhesion forces on the membrane, dust can accumulate, which leads to a decrease in measurement accuracy. To eliminate this, a constant membrane cleaning is provided with compressed air supplied through the apertures of the regenerating disks 10 simultaneously over the entire surface of the membrane. To regenerating

Air is supplied to the discs through the hollow rod 2 using a rubber tube 11 ki. The elastic element 12 on the rod allows the dust chamber to be separated from the atmosphere.

In the proposed device, the membrane is made of rigid metal. In the case of small pressure drops, a rubber or fluoroplastic membrane can also be used in la.

The device allows to significantly reduce the wear and tear of fabric sleeves and the emission of valuable dust into the atmosphere.

Claims (3)

1. USSR author's certificate  125118, cl. B 01 D 29/36, 1959. 2. USSR author's certificate 381368, cl. On 01 D 37/04, 1970. 3.Patent of Switzerland 543296,. cl. B 01 D 46/02, 1971. I YU t2 one tp