Fluid handling – Systems
Patent
1998-09-29
1999-11-30
Chambers, A. Michael
Fluid handling
Systems
137883, E03B 707, F15B 707
Patent
active
059924535
DESCRIPTION:
BRIEF SUMMARY
The invention concerns a flow-dividing and deflecting arrangement for the flow division and flow deflection of flowable and/or gaseous substances, comprising an elongate extending structure having a structure longitudinal axis and at least one dividing system in which the substance is conducted from a total flow channel, in which the substance is guided in a combined flow, to a series of openings that are arranged along the length of the structure and associated with a narrow outlet region extending along the structure length, the total flow channel being branched into two substance guiding channels of a first dividing stage that divide the total flow at a first dividing point and at least one further dividing stage, in which each channel end of the previous stage branches off at the associated dividing point into two channels that divide the flow and deflect the latter in opposed directions in the elongation direction of the structure, being arranged subsequently. Two operational functions, in particular in both flow directions, are associated with the flow channel system arranged in the interior of the flow channel structure. The flow channel structure is preferably part of an application arrangement, e.g. a perforated cylinder rotary screen printing machine. It can be incorporated in a carrier beam of such a machine or joined to a carrier beam. However, the flow channel structure can also be utilised for other purposes of uniform fluid distribution over a width.
A flow channel structure of this type is known from WO 94/17927. A total flow channel which starts at a connecting opening arranged at an end face extends up to the longitudinal centre of the flow channel structure. Here, a flow division occurs by means of a T-shaped channel junction. This known flow division occurs directly after a 90.degree. flow deflection from the longitudinal direction to the transverse direction in combination with an appended 90.degree. double deflection which forms the actual division. Known arrangements of the same type satisfy only some of the required demands, and also only within limits. In particular, an arrangement with which the field of very large flow amount rates with all substances from dilute to those of a highly viscous composition and specifically for relatively large working widths, namely in particular 3 to 5 meters, can also be mastered with dividing precision has not existed hitherto. This shortcoming is particularly true in connection with rotary screen printing machines, i.e. in view of the confined spatial conditions of rotary screens. The opening diameter of the most commonly used rotary screens is only 130 to at most 160 mm. The shortcoming exits also with regard to the required stability, i.e. the straightness across the whole structure length. A substantial disadvantage of known flow channel structures can be seen in the imprecision and unreliability of the division, particularly when using substances of very different viscosity and/or amount. The larger the amount of substance, structure length and/or viscosity difference, the more serious the shortcomings become. Some of the shortcomings of the known flow channel structure and fundamentals are described with reference to the schematic FIGS. A to C of the prior art.
FIG. A shows a generally known T pipe junction. In FIG. B there are shown a relatively long flow stretch Q before the flow junction and both of the identically long short T junction stretches L1 and L2 with associated outlet flow resistances G1 and G2. Only when the stretch Q is sufficiently long and the stretches L1 and L2 are of the same length can a halving of the flow be expected. FIG. C shows a known flow channel structure that comprises an elongate plate in which a flow channel system with continued bifurcation is incorporated. The total structure comprises two such plates which are fabricated to be symmetrical and are imperviously joined at the view faces shown in FIG. C. In FIG. C the longitudinal extension of the flow channel structure is shown compressed. It can be consider
REFERENCES:
patent: 2734224 (1956-02-01), Winstead
patent: 3936262 (1976-02-01), Hehl
patent: 4017240 (1977-04-01), Nelson
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