US1973714A - Venturi tube - Google Patents

Description

Sept. 18, 1934. c. JUSTHEIM VENTURI TUBE Filed Jan. 11, 1934 V/z W Patented Sept. 16, 1934 UNITED- STATES PATENT OFFICE VENTURI TUBE Clarence I. Justheim, Salt Lake City, Utah Application January 11, 1934, Serial No. 706,308 R E I S S U 4 Claims. '(01. 230-92) My invention relates to Venturi or suction tubes and has for its object to provide a new and efficient suction tube which may be 'used to create planes for suction in any desired place, such as upon aeroactuating their wind instruments, on automobiles to gauge wind resistances when traveling, or to actuate the speedometer of the automobile, or to be used in the suction device for mixing fuel and air for carburetion of the fuel for the .engine.

A further object is to provide a suction device which has the interior form so designed thatit will accomplish the best results obtainable with a suction tube either when used with gas or fluids.

A still further object is to provide a suction Venturi tube for drawing fluids therethrough to increase the suction in the ports thereof, the design being such as to create the greatest suction obtainable with this type of device.

These objects I accomplish with the device illustrated in the accompanying drawing in which similar numerals and letters of reference indicate like parts throughout the several views and as described in the specification forming a part of 5 this application and pointed out in the appended claims.

In the drawing in which I have shown the device 1 Figure 1 is a diagrammatic view to illustrate the proper manner of laying out the design for the tube with the correct and most eflicient angles of flare used therein.

Figure 2 is a diametrical section of the device showing the use of only one suction port.

Figure 3 is a diametrical section of the device showing the use of a ring of ports through the de- J vice into an annular ring, to create suction in the ring, and thereby from' the device to which the lead line from the ring is attached.

This application is a segregation of portions of the patent application filed by me on February 2, 1932, serial Number 590,493, for Suction and vaporizing devices.

In the drawing I have shown the device as made of opposed frusto-conical chambers A and B joined together by a curved wall C with the angles of flare and the diameters and radii figured out to give the most efiicient device possible.

In Figure 1, the diagrammatic view, the manner of building the. device is shown. The flare A is made by first laying out the walls thereof with a predetermined flare. This tube is preferably eight inches long with an internal diameter at the small end of 1 inch. At the small end of the flared tube A, I then lay off a line a perpendicularto the wall 3 and then using a radius equal to the diameter of the small end, I then scribe the curved wall C. With the line a as a base, I

I then erect a perpendicular line b thereto, the base gential to the curve, and the small end of the chamber B is of larger diameter than the small end of the chamber A.

In Figure 2 of the drawing a port 1 leads into the interior of the device at that juncture of the curved wall C to the chamber A at the point at which the inner 'wall 3 of the chamber A is tangential to the inner wall 4 of the curve C. The port is formed or. bored through the wall with the axis thereof in alignment with the juncture of the curved wall to the flared wall 3 but slight variation may be made without departing from the efiiciency of the-device to any great degree.

In Figure 3 of the device the juncture of the curved wall to the chamber A is surrounded by so an annular chamber. 5 formed of two halves secured together to form the completed chamber and the interior of the chamber 5 is in connection with the interior of the device by the row of ports 6 bored through the-wall 7 of the flared chamber A1 at the tangential juncture-of the curved wall 8 to the wall 7. A lead' line 9 draws from any suitable or desired source or creates suction in any instrument to which the device may be attached.

An arrow :1: shows the fluids through the device.

In using this Venturi tube as a carburetor suitable control valves must be provided to con- 95 trol the suction through the device, and these valves maybe mounted at either end of the suction device or at both ends if so desired.

Through experimentation, the following table was worked out for the flared chamber B to show the various results using different flares, thus showing, that the best angle of flare is that described.

direction of travel of The contraction coefllcients were then deduced from Cc=C+Cm The method of obtaining the coefiicient of velocity makes no allowance for the retardation of the particles in the chamber B by the atmosphere; hence the coefficients may be a little small, and the contraction coefficients would then be too large, as deduced from the above equation.

This would seem to account for the value 1.001, as seen in the second column.

Relative to the chamber A, the chief loss or head in the standard short tube is occasioned by the sudden enlargement of the contracted vein to fill the full section of the tube. Thus the curve of chamber A is formed with the walls to fit the curve of the passing fluid in order to obtain the greatest eficiency,

Having thus described my invention, I desire to secure by Letters Patent and claim:

1. In a Venturi tube, the combination or": onposed :trusto-conical axially aligned chambers joined together by a curved wall with the cham her into which the fluid is introduced of larger diameter than the other cber, and with the smaller chamber tangential to the curved wall.

2. In a Venturi tube, the combination of a flared chamber having the small end joined onto an inwardly curved wall; another flared chamber joined onto the end of the curved wall with thewalls thereof tangential to the curve; and a port through the tangential juncture of the curved wall to the'flared chamber.

3. In a device of the class described, the combination of a rustic-conical chamber joined to an opposed irusto-conical chamber by a curved wall with the smaller diametered chamber joined to the curved wall so that the walls are tangential to the curve; a row of annular ports through rec

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