US 3166020 A
Description (OCR text may contain errors)
Jan. 19, 1965 E. E. cooK 3,166,020
VENTURI MIXER NOZZLE Filed Sept. 20. 1961 25' i, f w 25 1 3/6 \27 5 44 3 19 T 23' r L Y.
' F I E: E I I 3/ 29 1 30 36 El I 22 4 4 25 -25 41 I V 32 l 34 J as 35 T 24 FIE: E t ,6
INVENTOR. Ernesz 5. Cook BY 4 United States Patent Ofifice I 3,166,020 Patented Jan. 19, 1965 tion, there exists :a tendency of some of the dissolved particles to settle out and collect at the bottom of the solution container. This tendency to settle out is one of the problems encountered when wettable powders such as spraying suspensions are suspended in tanks of water and then are sprayed on fruit trees, growing vegetables and the like.
So that a homogeneous mixture is sprayed when the solution tank is full or empty, a means of constant agitation is often required. This may take the form of propellers, bubbling of the solution, etc.
When a sprayer is mounted on a vehicle and has its own associated pump, a common practice to maintain thorough and continuous agitation is to by-pass a portion of solution being pumped from the pump outlet and to allow the by-passed solution to return to the solution container Where it is discharged through a venturi nozzle. The venturi nozzle, when positioned near the bottom of the container, will draw the settling particles and surrounding liquid into the venturi whereafter it is discharged therefrom with appreciable agitation.
Present commercial designs of the mixer-type venturi nozzle comprehend a single self-contained venturi unit.
The entire unit is cast as a sand casting and thus requires extensive machining to smooth certain portions. Also, when venturi nozzles of the present design are manufactured, troublesome and expensive coring operations are required in order to form the necessary openings and chambers. Therefore, it is a general object of this invention to provide a venturi nozzle which is comprised of an assemblage of parts that are easily fabricated into a final configuration with a minimum of expense and time involved.
More specifically, it is an object of this invention to provide an improved venturi pipe which is highly economical and easy to manufacture.
Another object of this invention is to provide an efficient venturi nozzle which is assembled in a very few simple components and thus lends itself to ready replacement of individual parts.
A further object is to provide a by-pass venturi nozzle which lends itself to interchangeability of orifice Washers thereby providing variations in venturi eifect to accommodate fluid suspensions of difierent viscosities and concentrations of solids.
These and other objects and advantages of this invention will more fully appear from the following description, made in connection with the accompany drawing, wherein like reference characters refer to the same or similar parts throughout the several views and in which:
FIGURE 1 is a diagrammatic view of a typical solution pumping system incorporating a venturi nozzle;
FIGURE 2 is an enlarged cross-sectional side view of the venturi nozzle assembly shown in disassembled arrangement;
FIGURE 3 is a replaceable element of the assembly shown in FIGURE 2;
FIGURE 4 is a full cross-sectional view of FIGURE 2 taken on line 4-4; and
' FIGURE 5 is a side view of the venturi nozzle having inlet and outlet pipes shown in fantom drawing and'typical solution flow represented during actual operation.
Referring again now to FIGURE 1, a typical pressure spraying system 9 is shown, having a pump 10 which is suppliedvia supply line 11 with solution 12 from tank 13. for discharging through spray nozzle 14. The solution is generally a mixture of wettable powder and water.
Feeding the outlet pipe 15, to pump 10, is a by-pass pipe 16 which leads into tank13and connects directly to the venturi nozzle assembly referred to generally as 17. Venturi nozzle assembly 17 in turn has connected at the upper outlet end a discharge pipe 18.
Referring now more particularly to FIGURES 2, 3 and 4, the detailed design of this invention will-be explained.
The nozzle assembly 17 is comprised of four elements; namely, a venturi pipe 19, an orifice disc 20, a retainer washer 21 and a reducer coupling 22.
The venturi pipe 19, as seen in FIGURE 2, is a onepiece molded element of material such as high impact plastic which has a forward frusto-conioal housing 23 a which in turn is secured to a rear'housing 24 by means of four bridging columns 25.
The forward housing 23 has an expansion chamber 26 defined by side wall 27. The expansion chamber is also of a frusto-conioal shape terminating upwardlyin discharge opening 28 and terminating rearwardly in a constriction 29. Forming a part of the forward housing 23 and continuous with the expansion chamber is the entrance chamber 30 being of a reverse frusto-conical shape to that of expansion chamber 26 and being defined by side Wall 31. Entrance chamber 30 terminates forwardly in constriction 29 and rearwardly in entrance opening 32. The purpose of the entnance chamber 30 being shaped with a rearwardly directed frusto-conical opening, is to provide an efficient design for receiving the fluid from by-pass pipe 16 and simultaneously to draw in a portion of the surrounding suspension 12 as will be explained subsequently.
Axially aligned with the entrance chamber 30 and expansion chamber 26, and spaced rearwardly of the entrance chamber opening 32, is an orifice chamber 33 which is contained within rear housing 24. As seen in FIGURE 2, the orifice chamber has a disc opening 34 which terminates rearwardly in a shoulder 35." Shoulder 35 provides a seating means for the orifice disc 20. The open space'between the entrance opening 32 and disc opening 34 defines an open venturi chamber 36. I
As seen inFIGUREZ, the rearward housing 24 is furnished .with a threaded means for retaining the reducer coupling 22 therein when the orifice disc 20 is properly seated within orifice chamber 33.
The orifice disc 20 has an outside surface configuration which coincides with that of orifice chamber 33. Internally, orifice disc 20 has a frusto-conically shaped passageway 37 defined by annular wall 38. A retainer Washer 21 is provided next in the assembly sequence so that the forward end 39 of reducer coupling 22 may gently urge the orifice disc 20 against the shoulder 35 of the orifice chamber 33. Reducer coupling 22 is therefore threaded at 40 for engagement with rear housing 24. The rearward portion of reducer coupling 22 is also threaded at 41 for securement to by-pass pipe 16 (see FIGURE 1). As seen in FIGURE 2, reducer coupling 22 has a partial constriction 42 intermediate its ends which increases the fluid velocity and also provides a standard coupling for hose or pipes.
As described above, FIGURE 4 is a full cross-sectional view of FIGURE 2 and shows the four bridging columns 25 with respect to the outside dimensions of the rearward housing. FIGURE 2 also shows the disc opening 34. The rearward housing external surface is shaped in hex- 7 like dimensions.
cosities or mixture densities, it may also be desirable to use various sized orifice discs as shown.:
gaged with the'by-pass pipe 16 at the lower threaded portion 41 and the venturi pipe 19 connected at the forward end by means of threaded portion 43 to a discharge pipe will pass fronrthe by-pass pipe 16 "through the orifice disc 20 and,: under increasedpressure, but reduced volume,
With a particular sized orifice discincluded in .the ori-" fice chamber 33, and a particular pressure of fluid being 1 pumped therethrough, a predetermined amount of fluid 4 ing an orifice chamber terminating forwardly in a shouldered opening at a fixedlocation spaced from and disposed in alignment with said expansion chamber, a plurality of bridging columns interconnecting said forward housing and said rearward housing to thereby form an open venturi chamber therebetween in which fluids will be mixed when a pressurized fluid is forced into saidexpansion chamber from said orifice chamber, said assemblage further having an orifice disc removably seated within said orifice chamber and seated'against said shouldered opening, and a means threadedly received in into the venturi pipe expansion chamber 26. With the fluid under pressure, the natural tendencyof the ,venturi pipe will be to draw surrounding solution 12 as indicated by arrows 44. The fluid flow through the orifice disc is representedby arrows 45. By reference to FIGURE 4, it may be readily seen that there is sufiicientopen space betwen bridging columns 25 for adequatefluid flow, to enter the open venturi chamber 36.
, Because of the novel design of this invention, the characteristics of'the venturi may be easily changed by simply removing the reducer coupling and retainer washer and thereafter inserting a new-orifice disc 46 having a larger opening 47, such as that shown in FIGURE 3. lin this instance, with the new orifice disc installed, a larger volume of water under lower pressure would be forced into the expansion chamber 26 thus taking with it, via the open venturi chamber, a larger quantity of' surrounding solution 12. Likewise, if an orifice disc becomes said j orifice chamber for retaining said orifice disc in seated relationin said orificechamber.
, '2. A venturi mixer assemblage comprising, a venturi pipe having, a forward housing defining an axial open ended expansion chamber therethrough, a rearward hous-- ing having an open ended orifice chamber in axial alignment with the axis of said expansion chamber and spaced rearwardly therefrom, said rearward housing having a shouldered seat at its forward opening, an orifice disc removably seated on said shouldered seat and aligned with both said orifice chamber'fand said expansion chamber a means threadedly engaging said orifice' chamber for retaining said orifice disc in seated position, and circumferentially spaced bridging meansfor securing in fixed relation said forward housing to said rearward housing.
3. Atventuri mixer assemblage comprising, a venturi pipe having a forward housing defining an open ended frusto-conical expansion chamber, a rearward housing having. an open ended orifice chamber, said expansion chamber and orifice chambers being axially aligned and spaced from each other, a-plurality of bridging columns damaged or worn, it maybe easily replaced with one of Depending upon the solution of visconstruction withinexpensive and durable material. .It'
is also seen that the assemblage provides for interchange ability of any of the parts with a minimum of efiort and timeconsumption. There are no expensive moldings required and likewise no expensive machining operations after the items are molded before .they'may be used in actualioperation; I
- It will, of course, be understood that various changes may be made in the form, details, arrangements and' proportions of the parts without departing from the scope of the invention as set forth. in the appended claims I claim: V e p 1. A venturi mixer assemblage comprising, a venturi pipe having a forward housing defining an elongated fixedly securing said forward housing to said rearwardhousing, a removable orifice disc axially aligned and positioned in said orifice chamber, said rearward housing further having ashoulder inwardly of its forward opening for seating said orifice disc and thread means adjacent its rearward opening, and an annular removable means in threaded engagement with its rearward opening and retaining said orifice disc seated on said shoulder, whereby said retaining means may be removed and said orifice disc replaced with a like element having a different sized orifice opening. 7
References Cited in the file of this patent UNITED ,STATES PATENTS 642,046