Gas and liquid contact apparatus – Fluid distribution – Valved
Patent
1985-01-25
1986-09-02
Miles, Tim
Gas and liquid contact apparatus
Fluid distribution
Valved
261 44D, 137 98, 137894, F02M 722
Patent
active
046095063
DESCRIPTION:
BRIEF SUMMARY
This invention concerns improvements in and relating to throttled fluid mixing devices, and more especially to a device intended for mixing a first fluid, of which the rate of flow through a duct is to be controlled, with a second fluid to be introduced in to the first fluid flowing in said duct.
A wide variety of such mixing devices has been proposed for various reasons, including the mixing of liquid or gaseous fuels to be mixed with combustion air to be supplied to a burner, or for use as the carburettor of or fuel injection device of an internal combustion engine.
Known devices of the above-mentioned type have the disadvantage that the throttling of the flow of the first fluid can only be controlled approximately within a given range, as the performance of known kinds of throttling device cannot be accurately predicted in advance and must be determined by experiment. Thus, accurate control of the relative proportions of the two fluids to be mixed, whilst at the same time controlling the throttling of the primary fluid flowing in the ducting becomes extremely difficult and complicated, to the extent that the optimum fluid mixture for any given purpose cannot be obtained under all conditions of flow of the primary fluid through the throttle valve.
It is accordingly an object of the present invention to provide a combined throttle valve and fluid mixing device, which both achieves effective mixing of primary and secondary fluids and also enables throttling of the flow of the primary fluid in a predictable manner.
In accordance with the present invention there is provided a device for mixing a first fluid, of which the rate of flow through a duct is to be controlled, with a second fluid to be introduced into the first fluid whilst flowing in said duct, said device comprising an axially extending valve casing having an upstream end and a downstream end for connection respectively into the duct intended to convey said first fluid, and containing a disc-shaped valve member located axially within said casing and arranged for axial movement relatively to a flared inner wall portion of said casing located between said upstream and downstream ends and arranged to widen continuously in a direction away from said upstream end and towards said downstream end, whereby, in use, said valve member serves to throttle the flow of said first fluid, and means, coupled to said disc-shaped valve member, for introducing said second fluid into said valve casing at a point or points located immediately on the downstream side of said valve member, whereby the turbulent flow of said first fluid in the region immediately downstream of the valve member is effective to cause mixing of the two fluids.
It is a further and preferred object of the invention to provide a mixing device wherein the throttling of the flow of the first fluid can be achieved in such a manner that there is a predetermined mathematical relationship between the position of the disc-shaped valve member and the flow of said first fluid within the ducting. This can be achieved with a suitable construction of the disc-shaped valve member, and an appropriate shaping of the flared portion of the valve casing, as has been described in prior published European Patent Specification No. 0 007 165.
Further preferred features and advantages of the invention will become apparent from the following description with reference to the accompanying drawings, in which:
FIG. 1 is a sectional elevation of a fluid mixing valve in accordance with the invention, and
FIG. 2 is a view similar to FIG. 1 of another arrangement according to the invention.
Referring to FIG. 1, the reference numeral 1 indicates a run of ducting within which air is arranged to flow in the direction of the arrow X. Incorporated within the ducting 1 is an air flow control valve of which the casing is indicated generally at 2, and which comprises an upstream end 2A and a downstream end 2B respectively arranged for connection into the run of ducting 1. Between the upstream and downstream ends of the valve casing th
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Miles Tim
Spiro Investment A.G.
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