Rotary kinetic fluid motors or pumps – Shaft bearing combined with or retained by arm or vane in...
Patent
1999-08-31
2000-12-26
Look, Edward K.
Rotary kinetic fluid motors or pumps
Shaft bearing combined with or retained by arm or vane in...
415104, 415112, 415118, 4151691, F01D 2516, F04D 2904
Patent
active
061649058
DESCRIPTION:
BRIEF SUMMARY
The present invention concerns a flowmeter turbine comprising a tubular body through which the fluid to be measured passes and accommodating:
an upstream spider member and a downstream spider member which are each formed by a hub and fixed vanes supporting the hub in the tubular body,
the opposite faces of the hubs having a cavity on the axis of the tubular body to receive a support bearing/thrust bearing assembly, and
a screw member formed by a hub carrying vanes and an axis member, and disposed between the spider members, the ends of the axis member being accommodated in the support bearings of the spider members against the thrust bearings.
Flowmeter turbines are items of equipment which are highly sensitive to pollution of the fluid that they are measuring. Now, solid or highly viscous particles necessarily accumulate in the housings of the support bearing/thrust bearing assemblies: that increases the friction of such assemblies and causes a deterioration in the level of precision of the measurements afforded by the turbine.
In addition such particles reduce the operating life of the turbine.
The object of the present invention is to remedy those disadvantages and the invention proposes the provision of a flowmeter turbine which is insensitive to solid or viscous particles and indeed highly viscous particles, which are carried by the liquid to be measured.
For that purpose the invention concerns a flowmeter turbine of the above-defined type, characterised in that each spider member hub is traversed by at least one fluid duct opening into the cavity in line with the support bearing/thrust bearing assembly.
The circulation of the fluid which penetrates into the cavity, passes around the pivoting system formed by the axis member, the support bearing and the thrust bearing and makes it possible to rinse that cavity in order to remove the solid or viscous particles therefrom. That also makes it possible to prevent accumulated particles from agglomerating therein.
The invention reduces the coefficient of friction of the assembly, enabling the flowmeter turbine to retain its initial precision and sensitivity, making the turbine highly insensitive to pollution in the liquid: that makes it possible to measure liquids which are possibly more highly charged with particles than those measured at the current time, and to increase the service life of the turbine without necessitating frequent dismantling or replacement thereof.
In accordance with other advantageous features of the invention
the spider member hub comprises a plurality of fluid ducts rich are regularly distributed at the periphery of the hub;
the ducts can be inclines with respect to the axis of the turbine, the intakes of the ducts in the upstream spider member being disposed upstream of the support bearing/thrust bearing assembly and the outlets of the ducts of the downstream spider member being disposed downstream of the support bearing/thrust bearing assembly:
the ducts can be produced from an external groove provided on the outside of the spider member hub.
The present invention will be described in greater detail hereinafter with reference to the accompanying drawings in which:
FIG. 1 is an overall view of a flowmeter turbine according to the invention with the tubular body cut away,
FIG. 2 is a section view an enlarged scale of the upstream and downstream pivoting assemblies of the turbine shown in FIG. 1, and
FIG. 3 is a section view similar to that shown in FIG. 2 illustrating an alternative embodiment.
Referring to FIG. 1 the flowmeter turbine is closed of a tubular boy 1 receiving an upstream spider member 2 and a downstream spider member 3 between which is disposed a measuring helix or screw member 4. The direction of flow of the fluid in the flowmeter turbine is represented by the arrow A.
The upstream spider member 2 and the downstream spider member 3 are of the same shape and structure. Each is composed of a hub 21, 31 provided with vanes 22, 32 which carry the hub 31 in the tubular body 1. There are for example four such vanes 22, 32.
Barton Rhonda
Look Edward K.
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