Fluid handling – Systems – Multiple inlet with single outlet
Patent
1994-03-24
1995-07-11
Nilson, Robert G.
Fluid handling
Systems
Multiple inlet with single outlet
137888, B01F 504
Patent
active
054311900
DESCRIPTION:
BRIEF SUMMARY
FIELD OF THE INVENTION
The invention involves an apparatus for the induction and admixture of additives into a fluid stream by means of a joining piece that exhibits a through conduit for the fluid and a connecting conduit, which is joined with the through conduit, for the additive, whereby the additive is inducted by means of a negative pressure that is generated by the fluid stream, while a plug projects into the through conduit approximately transversely to the fluid stream, and this plug blocks a major part of the fluid stream, however, it can be bypassed by the flow to the side, longitudinally, through at least one gap, and at that place exhibits at least one opening that is joined with the connecting conduit for the additive.
BACKGROUND OF THE INVENTION
An apparatus of such a type is known through DE-OS 39 30 709 from the same applicant. It is distinguished by surprisingly high suction power at the connecting conduit for the additive, so that even the admixture of viscous, gelatinous media of high viscosity is assured. As the fluid in this regard, basically any liquid or gaseous medium comes into consideration.
Studies by the applicant have shown that suction action abates if the fluid that has been mixed with the additive must subsequently overcome high flow resistances, that is, if high back pressures downstream of the mixing apparatus have to be taken into account. In practice, this occurs, for example, if downstream of the mixing apparatus the fluid is to be atomized into the atmosphere or into a combustion chamber by means of fine jets.
SUMMARY OF THE INVENTION
Beginning from this point, the task of the invention lies in further improving the apparatus described at the beginning with respect to its suction power. In doing this, it should also be distinguished through a strong negative pressure at the connecting conduit for the additive, even if there are high back pressures. If, for example, an admission pressure of 6 bar is being used in the fluid, then the apparatus in accordance with the invention should tolerate a back pressure of 4 to 5 bar without the suction power abating significantly.
The resolution of this task succeeds in accordance with the invention by virtue of the fact that the gap cross-section for the fluid stream is selected in differing sizes at the two sides of the plug, and specifically, so that the gap cross-section on one side of the plug is, at the most, half as large as the one on the other side of the plug, and in the limit case, even approximately zero.
With this asymmetric arrangement, it has been shown, surprisingly, that the suction power is even higher than with the known apparatus described at the beginning, and that because of that, even higher back pressures in the outgoing line can be tolerated.
Possibly, this is based on the fact that the smaller flow-through gap provides for a higher suction power, while the larger flow-through gap allows a high flow-through quantity. If the plug is displaced to the extent that it can still be bypassed by the flow only on one side, then, along with the high suction power, a strong turbulence also appears and, in accordance with that, a good mixing of the fluid and additive as well.
As was already the case with the apparatus that was previously known, the dimensioning of the gap cross-section is of considerable importance here as well. It is advisable that the gap cross-section, or the total of the two cross-sections if the plug is being bypassed by the flow on both sides, amounts to approximately 5 percent to 8 percent of the fluid conduit cross-section.
In addition, it has proven to be advantageous if the plug exhibits an approximately round cross-section and projects on one side of the plug tangentially into the through conduit, or cuts into the neighboring wall of the through conduit with an undercut of approximately 1 mm--preferably 1/2 mm. In other words, the bore for the plug is displaced in a transverse direction relative to the axis of the fluid conduit by approximately 15 to 25 percent relative to the diameter
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