| 摘要 |
<p>1,256,086. Air-filtering systems. J. W. KICE; R. W. KICE and J. V. KICE [trading as K. B. ENG. CO.]. 28 Nov., 1968 [20 May, 1968], No. 56631/68. Heading BIT. [Also in Division F2] Sections of an air-filtering system, each having a plurality of filter bags 38, are automatically supplied in sequence, via conduits 52, with back-pulses of scavening air from a reservoir 48 by the sequential opening of rapid release valves 50. Control is by a pneumatic control system having corresponding sections A, B and C, each having a slide valve 56, 57 and 58 which valves are operated in turn. When slide valve 56 opens, air is supplied via conduits 150 and 142 to build up pressure in a resiliently-loaded piston valve 55, (Fig. 5, not shown), and at a pre-determined pressure, the latter operates to disconnect a conduit 157, connected to the reservoir, from a conduit 103. This allows a diaphragm valve 54 (Fig. 5, not shown) to open which, in turn, opens the rapid release valve 50 (Fig. 4 or 11, not shown). Air pressure in the conduit 51 associated with the filter bags of section A is also applied through a conduit 146 to slide valve 56 to close that valve and through a conduit 158 to slide valve 57 to open that valve so as to produce operation of section B. Similarly, operation of valve 50 of section B resets slide valve 57 and sets slide valve 58, and operation of valve 50 of section C resets slide valve, 58 and sets slide valve 56 to repeat the cycle. In a modified fluidic circuit (Fig. 10, not shown), timing is further controlled by a valve (212) connected between reservoir 48 and valve 56 and which opens at a preset pressure level; and a safety valve (218) is operable, should valve 56 stick, to open valve 55. The filter bags 43 are of the inward flow, hanging type; and may be made of felted or woven wool.</p> |
