MXPA00008279A - Sprayer for liquids and nozzle insert - Google Patents

Abstract

A liquid sprayer (10) with two side-by-side containers, an interconnecting bridge (13), and a nozzle insert (30) positioned interiorly of the bridge. Alternatively, a two container piggyback liquid sprayer, a button actuator (62) and a nozzle insert positioned interiorly of the button. One container (11) is for the product and the other (12) contains propellant. An intermediate portion of the nozzle insert has a venturi constriction with an internal propellant outlet orifice (52). Two product channels (37) transverse to the nozzle insert longitudinal axis overlap the internal outlet orifice by one-half. An expansion chamber (34) diameter is greater than the diameter of both the venturi constriction outlet orifice and an outer frustoconical surface (56) adjacent this orifice. The venturi outlet orifice is longitudinally spaced from the expansion chamber a distance to substantially prevent the propellant passing into the transverse product channels. The product channels are quasi-rectangular with areas greater than the venturi outlet orifice.

Description

SPRAY FOR LIQUIDS AND NOZZLE INSERT FIELD OF THE INVENTION The present invention relates to sprinklers for spraying paint and other liquids from a first container by the use of a pressurized driving gas carried in a second container and released from said container. BACKGROUND OF THE INVENTION Paint sprayers in which the paint is in a first container and the impeller gas in a second container have advantages over unique aerosol cans containing both the impeller and the paint. This last form of packaging requires extensive inventories of aerosol cans with various colors, and sales of a given color of paint may not be sufficient to justify the production, marketing and storage of aerosol cans with this given color of paint. The same can be said of other types of products marketed in aerosol cans, for example different types of insecticides, etc. However, in a two-container manual spray system of the aforementioned type, the container for the product can be used interchangeably with different colors or different types of paints since the product container is detachable from the rest of the spray system. After spraying a particular color or type of ^ j &fr. particular paint found in the product container, the product container is detached and cleaned in such a way that it is clean to be refilled with a different color (or the same) or with a Different type of paint (or the same type of paint) to spray later. The container with the driving agent can also be detached from the spraying system in such a way that when the driving agent has been exhausted in the driving agent container, a new container filled with driving agent can be fixed on the spraying system. As can be seen, such systems have considerable versatility and have become popular. A type of two-vessel system commercially available employs two vessels side by side connected to each other by a bridge member. A driving agent from the driving agent can flows through the bridge and exits the bridge through a nozzle that sits on a product tube that extends down into the product container. The rapid flow of the impeller on the end of the product tube creates a lower pressure at this point in such a way that the air pressure acting on the liquid in the product container pushes the product up the product tube and towards the driving gas stream. In systems of this type, a very low relation between product and driving agent for reasons that include the fact that the pressure is only moderately lower in the upper part of the product tube. Modifications of this system from side to side place the bridge with its outlet nozzle forward of the upper part of the product tube, and with a form of nozzle insert placed on the bridge near the outlet nozzle. The driving gas passes through a nozzle insert and acts in the same manner to decrease the pressure on the end of the product tube to cause the product to flow into the driving gas stream. Said last system has a better relation between product and impeller, for example, of the approximate order of 3 to 1, but there is still an excessive use of the driving agent. System nozzle inserts of this type have an unsatisfactory design and do not create a sufficient vacuum in an upper part of the product tube. An additional type of two vessel system has the impeller container mounted on top of the product container. The product from a tube in the lower container can flow up through a tube in the impeller reservoir to an actuating button in the upper part of the impeller vessel. A nozzle insert in the button, which operates generally as stated above, resulted in improved relationships between product and driving agent of five or six to one in the case of products of water viscosity. It would seem beneficial that such systems have a better relationship between product and driving agent. • COMPENDIUM OF THE INVENTION 5 The present invention provides a mode of a liquid spray system having the two containers side by side described above, a little before interconnection, a nozzle insert placed on the inner part of the bridge, and between product and driving agent approximately 13 to 1 in the case of product of the viscosity of the water. The nozzle insert has a rear portion in fluid contact with a drive agent channel in the interconnecting bridge; an intermediate portion that contains a venturi constriction with an exit orifice from which the impeller can exit and at least two product channels adjacent to the venturi constriction and extending substantially transversely relative to the longitudinal axis of the nozzle insert; and a portion front containing an expansion chamber with an inlet diameter significantly greater than the diameter of the venturi constriction. The expansion chamber has a sufficient length so as not to substantially disrupt the vacuum established by the outlet of the venturi constriction in the cross product channels.

A lower bridge space extends over approximately the intermediate portion of the nozzle insert and is also in fluid communication with both an opening in the bridge from the product container 5 and with the cross product channels. The transverse product channels extend longitudinally forward of the venturi constriction and also extend longitudinally backward to longitudinally buttress the venturi constriction, said splice being about half the longitudinal dimension of the product channels in one embodiment of the present invention. A smoothly tapered surface, for example a frusto-conical surface, surrounds the outlet of the venturi constriction, the smaller front outer diameter of the The tapered surface is smaller than the inlet diameter of the expansion chamber. A smooth product flow extends from the product chamber into the gas stream leaving the venturi constriction orifice. Venturi constriction output is spaced longitudinally of the inlet of the expansion chamber in such a way that the circumference of the envelope of a cone of a driving gas leaving the constriction exit remains substantially equal to or less than the circumference of the expansion chamber inlet until the cone penetrate into the expansion chamber. If • this cone becomes greater in circumference, the driving gas that leaves the constriction outlet will pass partially upwards in the cross product channels to create swirl circuits and this decreases the vacuum created by the venturi constriction, thereby decreasing the relations between product and driving agent . In the present invention, the cross product channels have areas substantially greater than the venturi constriction outlet orifice area, and for increase product flow, it can have an outlet opening of a shape having both curved complements and linear complements that they form an almost rectangular shape. The nozzle insert is also a unitary member in the described embodiment. An alternative embodiment of the present invention employs a liquid spray system of two containers mounted one above the other where the aforementioned nozzle insert itself is mounted correspondingly within a space in the button actuator on the drive agent container . In the case of products with a viscosity similar to the viscosity of water, it is possible to obtain ratios between the driving agent and product of the order of about 9 to 1. Other characteristics and advantages of the present invention will be apparent from the following description, A & drawings and the claims. BRIEF DESCRIPTION OF THE DRAWINGS: Figure 1 is a side elevational view of a liquid sprayer having two containers separated side by side and 5 an interconnecting bridge; Figure 2 is a top plan view of the interconnecting bridge of the sprinkler of Figure 1; Figure 3 is a longitudinal cross-sectional view of the interconnecting bridge of the sprinkler of Figure 1 along the line 3-3 of Figure 2; Figure 4 is a fragmentary cross-sectional view of a portion of Figure 3 but on an enlarged scale to illustrate the nozzle insert of the present invention mounted within the interconnecting bridge; Figure 5 is a cross-sectional view of only the nozzle insert illustrated in Figure 4; Figure 6 is a top plan view of the nozzle insert illustrated in Figure 5; Figure 7 is a cross-sectional view of the insert of the nozzle along the lines 7-7 of Figures 5 and 6; Figure 8 is a front elevation view of the nozzle insert illustrated in Figure 5; Figure 9 is a side elevational view of an alternative form of liquid spray having two separate containers 5 mounted one above the other, and wherein the insert ^ ___ ^^ j £ 7g ^^! ^ | . The nozzle of the present invention can be used; Figure 10 is a fragmentary cross-sectional view on an enlarged scale of the upper portion of Figure 9, in the vertical diametrical plane and illustrating the nozzle insert 5 of the present invention mounted on a driving button. DESCRIPTION OF THE MODALITIES Figures 1-3 generally illustrate a liquid sprayer 10 having a container 11 for material to be sprayed, Example of paint, a container 12 containing an aerosol impeller, and an interconnecting bridge 13. The aerosol impeller may be in the form of a partially liquefied impeller gas under substantial pressure. An interconnecting bridge 13 is molded from plastic and can is snapped into the container 12. The container 12 has a conventional aerosol valve mounted on its upper part in a conventional aerosol assembly dimension. The bridge 13 in its position directly above a container 12 can have flexible dependent tabs that are fit within the conventional aerosol mounting cup to retain the bridge 13 in the container 12. Alternatively, a circular flange depending on the bridge can be press fit on the outside of the mounting cup. The bridge 13 also has an articulated member that can be pressed 14, which when pressed by the finger of a user of the sprayer drives the aerosol valve to release the impeller gas from the aerosol container 12 up into an internal channel 15 in the bridge 13. The aerosol valve valve stem fits into a central opening 5 in the surface inner of the squeezing member 14, such that when the member 14 is depressed downward, the driving gas flows upward into the aerosol valve stem in the bridge channel 15 as illustrated by the date in Figure 3 When the gas is released from the aerosol container 12, it flows forward along the inner channel 15 towards an inlet of a nozzle insert 30 contained within the bridge 13. The outlet of a venturi constriction within the nozzle insert 30 pull the product on bridge 13 a From the product container 11, the bridge portion in the product container has threads for engaging with threads in the upper part of the container 11. An end 17a of a tube 17 extends almost to the bottom of the container 11, and the another end 17b of the tube 17 surrounds a tubular part of the bridge 13, said part 18 has an internal channel that provides a flow path for the product in the bridge and finally to a position adjacent to the venturi constriction outlet. The exit of the venturi constriction with its reduced pressure creates a vacuum, and the air pressure in the liquid in the container 11 pushes the product from the aS? tf¡3¡Uti? & 3A ~ *? * A. ~ ÍZ J & tiSi? Aks?, ^, - container 11 up tube 17 on the bridge. The product and the driving gas are mixed and come out of the spray 10 in the form of a spray. Referring now to Figures 4-8, the novel molded plastic nozzle insert 30 is illustrated, which also includes its particular interrelationship with the bridge 13, as shown in Figure 4. First these structures will be described and then will make a description of the most critical aspects of these structures. A nozzle insert 30 extending along its central longitudinal axis has a rear portion 31 containing a channel 32 leading forward to the venturi constriction, and a front portion 33 containing an expansion chamber 34. A portion intermediate nozzle insert 30 contains the venturi constriction and two transverse product channels 37. Figure 4 illustrates the nozzle insert 30 contained within the interconnecting bridge 13 in a front end opening 38 thereof. Both the outer surfaces of the nozzle insert 30 and the inner surfaces of the bridge end opening 38 are circular in their transverse planes perpendicular to the central longitudinal axis of the nozzle insert 30, except when otherwise shown or described below with relation to the inlet to the product channels 37. The nozzle insert 30 can be inserted from the forward end of the sprinkler 10 and captured by a circumferential rim in the side wall of the opening 38 in the bridge 13. The bridge 13 is shown in Figure 4 having the dependent tubular part 18 in which the end 17b of the mentioned product tube 17 is mounted which extends into the container 11. The product flows up into the tube 17 and into a cylindrical space 39 within the bridge surrounding the nozzle insert 30. From this cylindrical space 39 the The product continues in the two diametrically opposed product channels 37, described further below, which extend into the interior of the nozzle insert 30. This product flow is shown through the arrows in FIG. 4. A frustoconical surface 40 of font 13 serves to help direct the flow of product inwardly towards the product channels 37. A cylindrical channel 32 of nozzle insert 30 is evidently in axial communication with an internal gas channel 15 of the bridge 13. Referring now to the figures 5-8 illustrating the nozzle insert 30 per se, it will be noted that a cylindrical channel 32 extends forward to a converging channel 50 and a narrower cylindrical channel 51 that forms the venturi constriction and has a circular constriction exit orifice 52. The diameter of the constriction exit hole 52 for the driving gas coming from the container 12 is significantly smaller than the diameter of the cylindrical expansion chamber 34, as will be discussed later. Further, the forward end of the channel 51 is spaced at a particular distance in the longitudinal direction from the circular edge 53 of the forward portion 33 surrounding the expansion chamber 34, also as discussed further below. It will be noted that the two product channels 37 extend generally inward toward the longitudinal axis of the nozzle insert 30. The product channels 37 extend longitudinally in a forward direction from the gauze outlet 52 to a front portion 33. of the nozzle insert 30, and extend longitudinally in a backward direction from a gas outlet 52 to significantly buttress the venturi constriction and its outlet. This amount of splice is about half the longitudinal size of the product openings 37 in the illustrated embodiment. The front surfaces 54 of the product openings 37 extend inwardly and backwardly as shown in Figures 5 and 6. The rear surfaces 55 of the product openings 37 extend forward and inwardly as shown in the figures. 5 and 6. The frustoconical or slightly tapered surface 56 of another shape surrounding the channel 51 also serves as a continuation surface directed inwards and towards in front of the rear surfaces 55 of the product openings 37, which serve to smoothly direct the flow of product in and out to mix it with the driving agent in the expansion chamber 34. With reference now to product openings 37, reference is made to Figure 6. Each product opening 37 in its outer opening is partially circular (in the longitudinal direction) and partially rectangular (in the transverse direction), this latter aspect provides a flow of product greater than not available with a fully circular opening for the same given longitudinal direction. Fig. 7 offers a further view of product channels 37 extending into the nozzle unit 30, and Fig. 8 illustrates the front end outlet of the nozzle insert 30. 15 Fig. 9 illustrates an alternative form of liquid spray , which has a container of aerosol impeller 60 screwed into a liquid container 61 containing the product to be sprayed. An actuating button 62 when pushed downwards serves to operate the sprinkler and is shown in greater detail in Figure 10. The tube 63 carries a liquid product up through the tube extending upwardly in the container 60 to exit the central portion 64a extending upwardly of the plunger of aerosol valve 64 in the button 62, the button has a central opening 65 which fits over the central portion that extends upwards 64a. The valve plunger 64 also has three peripheral holes 66 spaced 120 degrees around the circumference of the valve plunger 64 and exiting below the portion 64a, an orifice of this type is illustrated in the cross section of FIG. 10. orifices 66 present outlet for the driving agent that is in the drive agent container 60 through a conventional aerosol-type valve when the valve plunger is depressed by the button 62. Within the button 62, at its end opening 67 there is also the identical nozzle insert 30 of FIGS. 5-8 described above. When the button 62 is depressed, the product flows into the cylindrical space 68 surrounding the nozzle insert 30, and the impeller flows upward in a circumferentially extending channel 69 in the button 62 that butts the holes 66 and in the rear end of the nozzle insert 30. The nozzle insert works exactly as described above with reference to figures 4-8. Similar systems have previously been employed as shown generally in Figure 9, obtaining ratios between product and driving agent in the order of five or six to one for a product of viscosity similar to the viscosity of water. However, the sprayer in Figures 9-10 that has the nozzle insert »^ & a &3 &- * > ? __ ¿_w * -. < . _ .__ «~. • ® ^ ¿) tß &gsiz & * s ^ 30 of figures 4-8 and ?? The internal button configuration of Figure 10 has achieved product-to-agent ratios of approximately nine to one in the case of a product having a viscosity similar to the viscosity of the water. Various elements of the above description and drawings are significant to obtain the remarkable relationships between product and driving agent that are obtained in the present invention. With reference to Figures 4-8, it is currently believed that the following is important: (a) the longitudinal space from the gas outlet port 52 extending forward towards the inlet of the expansion chamber 34, starting at a circular rim 53, must have dimensions such that the outer circumference of the ejector gas outlet orifice expansion cone 52 remains essentially less than or equal to the circular rim circumference 53 until the gas has passed forward in the expansion chamber 34 This is shown diagrammatically in dotted line in Figure 5. If this cone circumference becomes larger than this before its forward movement reaches circular edge 53, the high speed gas will partially pass back into the channels of cross-sectional products 37 to create eddy currents and this will decrease the vacuum created by the venturi constriction. This will obviously decrease the SS &j_ ^ A .- ^ ^. ^^ "'* desired relations between product and driving agent (b) The gas outlet 52 must have a diameter significantly smaller than the diameter of the expansion chamber 34, both to allow expansion as the mixture and then to ensure, in combination with the longitudinal space discussed in (a) above, that the circumference of the gas expansion cone does not significantly exceed the diameter of the circular edge 53. In addition, the outlet orifice of gas 52 must, in relation to the diameter of the expansion chamber 34 and product channels 37, be of a size such that the desired relationships between product and driving agent are obtained. (c) A significant amount of longitudinal splicing of transverse product channels 37, rearwardly from the circular outlet 52. As mentioned above, this splice is approximately half the longitudinal dimension of the product openings 37 in the described modality. (d) The rear surfaces 55 of the product openings 37, and the frusto-conical surface 56 surrounding the channel 51, must provide a smooth flow of product through the product openings 37 and in the gas flow from the orifice of the product. gas outlet 52. Sharply projecting edges along surfaces 55 and 56 may result in eddy currents in the flow of x * fa ^^ 5Í ^ __ __ ^^^^^^^^^^ _ ^ i ^ -S ^^^. «.. * product, which results in a decrease in the desired relationship between product and driving agent. The frusto-conical surface 56 must end in the forward direction at a leading edge 57 having a diameter smaller than the diameter of the circular edge 53 of the expansion chamber 34 so that the product flows from the product channels 37 downwards in the gas stream leaving the gas outlet 52. (e) The product channels 37 must be of sufficient size to achieve the desired relationships between product and driving agent. The product openings can be enlarged as shown in Figure 6 in such a way that they have both circular and rectangular components as described above. In this way a larger product tube can be obtained for a given longitudinal dimension of product channels 37, and a larger diameter product tube 17 can be used. The product tube 17 has an external diameter of .158 inches in the manner described herein. (f) The length of the expansion chamber 34 must be sufficient to obtain proper expansion and proper mixing of the product and gas and must also be large enough so as not to adversely affect the desired vacuum in the product channels 37. However, the expansion chamber 34 should not be so large as to create a frictional back pressure that results in less desirable spray characteristics. (g) The diameter of the inlet 32 towards the nozzle insert 30 must be such, relative to the remaining diameters in the nozzle insert, that the desired relationships between product and driving agent are obtained. The dimensions of a nozzle insert for a particular embodiment are set forth below. However, it should be understood that these dimensions may vary for embodiments constructed to spray products of varying viscosities and other characteristics. As can be seen here, however, these dimensions are inter-related. It is currently believed that different dimensions for the orifices of the nozzle insert 30 described above will remain in substantially constant ratios between them according to their respective areas. In the same way, the length of the expansion chamber will probably vary with respect to the orifice areas. Dimensions of a nozzle insert mode 30: Channel diameter 32: .030 inch Orifice diameter 52: .012 inch Expansion chamber diameter 34: .032 inch Longitudinal dimension of each channel 37: .040 inch Transverse dimension of each Channel 37: .050 inch (in diameter) ^ '^^ - "" - * • - - ^ - - •' ^^ A ^^^, ___, _, _.-_,. Jfj, y ^ "Nozzle Insert Length 30: .369 Inch Channel Length 32: .212 Inch Channel Length 50: .066 Inch Channel Length 51: .018 Inch Expansion Chamber Length 34: .049 Inch Portion front outer diameter maximum 33: .185 inch Rear portion outer diameter 31: .095 inch Surface angle 56 relative to the longitudinal axis: 17 degrees 7 Surface angle 55 relative to the transverse axis: 11 degrees Longitudinal distance between edge 57 and edge 53: .016 inch In the prior embodiment of the present invention, as shown in the drawings and as described, the design of the nozzle insert 30 combined with the narrow fitting placement thereof within the bridge 13 or button 62, it results in the establishment of high voids in the cross product channels 37 in the order of 40-50 centimeters of mercury, for example. The vacuum, combined with the other significant design features mentioned above, results in remarkable relationships between product and driving agent in the order of about thirteen to one in the case of products having water viscosity. This relationship is far superior to the relationship that is currently found in available paint sprayers and the like. In addition, vinyl and enamel paints can be sprayed satisfactorily with sprinklers of the present invention. Those skilled in the art will note that variations and / or modifications to the present invention can be made without departing from the spirit or scope of the invention. The present embodiment therefore has only an illustrative purpose, but not a restrictive one.

Claims (1)

1. CLAIMS: (1) A liquid sprayer, comprising in combination a container for a liquid product to be sprayed, a container with a valve containing a driving agent, and an interconnecting bridge member for physically connecting the two containers in a relationship from side to side; said bridge member has a first device at a first end for fixing on the drive agent container and a second device at a second 10 end for fixing on the product container; said bridge member has an enclosed channel for transporting impeller from the first end to the second end of the bridge when the container containing the valve actuator is actuated; 15 a product opening extending in the inner part of the bridge adjacent its second end so that the liquid product flows into the bridge from the product container; a nozzle insert placed internally in relation to the bridge within a 20 bridge opening at the second end of the bridge; this nozzle insert has a rear portion, an intermediate portion and a forward portion; said back portion of the nozzle insert contains a channel in fluid communication with said channel enclosed in the 25 bridge; said intermediate portion of nozzle insert it contains a venturi constriction with an outlet orifice from which the impeller can exit and at least two product channels adjacent the venturi constriction and extending substantially transverse relative to the longitudinal axis of the nozzle insert; said front portion of the nozzle insert contains an expansion chamber having an inlet diameter significantly greater than the diameter of the venturi constriction outlet orifice, and said expansion chamber has a length sufficient to not substantially disrupt the vacuum established by the outlet of venturi constriction in the transversal product channels; an inner bridge space extending around the intermediate portion of the nozzle insert and in fluid communication with both the product outlet extending in the bridge and with at least two transverse product channels; said transverse product channels of the nozzle insert extend longitudinally forward of said venturi constriction and extend longitudinally backwards to longitudinally join said venturi constriction; said venturi constriction outlet is surrounded by a smoothly tapered outer surface having its smaller diameter in the forward direction and its larger diameter in the backward direction; the smaller forward diameter of the tapered surface is smaller than the inlet diameter of the expansion chamber; the transverse product channels have rear surfaces extending to the largest diameter of said tapered surface, said back surfaces and said tapered surface being characterized by the absence of protruding surfaces in order to provide a smooth product flow; said output of The venturi constriction is longitudinally spaced from the inlet to the expansion chamber such that the circumference of the envelope of a driving gas cone exiting the venturi constriction outlet remains substantially 15 equal to or less than the circumference of the expansion chamber at its entrance until the cone penetrates the expansion chamber. (2) The invention according to claim (1), wherein said transverse insert product channels. 20 of the nozzle longitudinally join said venturi constriction in approximately half of the longitudinal dimension of the product channels. (3) The invention according to claim (1), wherein said outer tapered surface surrounding the outlet 25 constriction venturi is a frustoconical surface. (4) The invention according to claim (1), wherein said nozzle insert is a unitary member. (5) The invention according to claim (1), wherein said transverse product channels each have an area substantially greater than the venturi constriction outlet orifice area. (6) The invention according to claim (1), wherein the ratios between the sprayed product and the driving agent are from about thirteen to one in the case of products having a viscosity similar to the viscosity of the water. (7) The invention according to claim 1, wherein each of said transverse product channels has an external opening that has the shape of both curved and linear components. (8) The invention according to claim (1), wherein the diameter of the inlet of the expansion chamber opening and the diameter of the venturi constriction outlet orifice are respectively approximately .032 inch and .012 inch or multiple of the same, the opening of the expansion chamber and venturi constriction exit orifice have areas in a ratio of approximately seven to one. (9) A liquid sprayer, comprising in combination a first container for a liquid product to be sprayed and a second container that contains an impeller, said second container can be fixed on top of said first container; a valve plunger and a driving button moi? trated on top of the second container; said valve plunger has a liquid product flow channel and a drive agent channel, said drive agent channel can allow the passage of the driving agent through a valve when the button is actuated; a tube device for 10 extends into the first container and extends upwardly through the second container towards said valve plunger; a product opening that extends on the inside of the button so that a liquid product flows into the button from the plunger of 15 valve; an actuator opening extending in the inner part of the button so that the driving agent flows into the button from the valve plunger; in nozzle insert placed on the inside of the button inside an opening in the button; said insert of The nozzle has a back portion, an intermediate portion and a front portion; said back portion of said nozzle insert contains a channel in fluid communication with said drive agent channel; said intermediate portion of nozzle insert contains 25 a venturi constriction with an exit orifice to from which the driving agent can exit and at least two product channels adjacent to the venturi constriction and extending substantially transverse relative to the longitudinal axis of the nozzle insert; said front portion of the nozzle insert contains an expansion chamber having an inlet diameter significantly greater than the diameter of the venturi constriction outlet, and said expansion chamber has a length sufficient to not disrupt the mass established by the constriction outlet venturi in the cross product channels; an inner button space extending around the intermediate portion of the nozzle insert and in fluid communication with both the product opening extending in the button and in the at least two transverse product channels; said transverse product channels of the nozzle insert extend longitudinally forward of said venturi constriction and extend longitudinally backwards to longitudinally join said venturi constriction; said venturi constriction outlet is surrounded by a smoothly tapered outer surface having its smaller diameter in the forward direction and its larger diameter in the posterior direction; the smaller front outer diameter of the tapered surface is smaller than the entrance diameter of the expansion chamber; the cross product channels have rear surfaces extending to the larger diameter of said tapered surface, said back surfaces and said tapered surface are characterized by absence of protruding surfaces in order to provide a smooth flow of product; said venturi constriction outlet is longitudinally spaced from the inlet to the expansion chamber such that the circumference of the envelope of a driver gas cone exiting the venturi constriction outlet remains substantially equal to or less than the circumference of the venturi. expansion chamber at its entrance until the cone penetrates the expansion chamber. (10) The invention according to claim (9), wherein said transverse product channels of nozzle insert longitudinally splice said venturi constriction in about half of the longitudinal dimension of the product channels. (11) The invention according to claim (9), wherein said outer tapered surface surrounding the venturi constriction outlet is a frusto-conical surface. (12) The invention according to claim (9), wherein said nozzle insert is a unitary member. (13) The invention according to claim (9), _ ^ j¡g »j > _ »_!, - ,.» .- «,». A &B; fc »aa & - afc ^^ ai_l __ ^ te ^ fe »a ^ ai8 ^ ¿j6a? aMa¿ ^.» Tfa < ^. * - «. - _. * »» »,. ^ _t _____ to £ _. wherein said cross product channels each have an area substantially greater than the venturi constriction outlet orifice area. (14) The invention according to claim (9), wherein ratios between the sprayed product and driving agent of about nine to one are achieved in the case of products having a viscosity similar to the viscosity of the water. (15) The invention according to claim (9), wherein each cross product channel has an external opening of a shape having both curved and linear components. (16) The invention according to claim (9), wherein the inlet diameter of the expansion chamber opening and the diameter of the venturi constriction outlet orifice are approximately .032 inch and .012 inch, respectively, or Multiple of these values, the expansion channel opening and venturi constriction exit orifice have areas in a ratio of approximately seven to one. (17) For use with a liquid sprayer, which comprises in combination a container for a liquid product to be sprayed, a container with valve containing a driving agent, and an interconnecting bridge member for physically connecting the two containers in a relationship -3aSi__a_- .. from side to side; an improved bridge member comprising a first device at a first end for attachment to the impeller vessel and a second device at a second end for attachment to the product vessel; said bridge member has an enclosed channel that carries the driving agent from the first end to the second end of the bridge when the valve driven vessel is actuated; a product opening extending into the interior of the bridge adjacent its second end to flow a liquid product into the bridge from the product container; a nozzle insert positioned internally relative to the bridge within a bridge opening at the second end of the bridge; said nozzle insert has a rear portion, an intermediate portion and a front portion; said posterior portion of the nozzle insert contains a channel in fluid communication with said enclosed bridge channel; said intermediate nozzle insert portion contains a venturi constriction with an outlet orifice from which the driving agent and at least two product channels may exit adjacent to the venturi constriction and which extend substantially transversely relative to the longitudinal axis of the mouthpiece insert; said front portion of the nozzle insert contains an expansion chamber having an inlet diameter significantly greater than the diameter of the venturi constriction outlet orifice, and said expansion chamber has a length sufficient to not substantially disrupt the vacuum established by the outlet of venturi constriction in the transversal product channels; an inner bridge space extending around the intermediate portion of the nozzle insert and in fluid communication with both the product opening extending in the bridge and with the at least two transverse product channels; said transverse product channels of the nozzle insert extend longitudinally forward of said venturi constriction and extend longitudinally backwards to longitudinally join said venturi constriction; said venturi constriction outlet is surrounded by a smoothly tapered outer surface having its smaller diameter in the forward direction and its larger diameter in the backward direction; the smaller front outer diameter of the tapered surface is smaller than the inlet diameter of the expansion chamber; the transverse product channels have rear surfaces extending to the largest diameter of said tapered surface, said back surfaces and said tapered surface being characterized by the absence of protruding surfaces in order to provide a smooth product flow; said venturi constriction outlet is longitudinally spaced from the inlet to the expansion chamber such that the circumference of the envelope of a driving gas cone exiting the venturi constriction outlet remains substantially equal to or less than the circumference of the venturi. the expansion chamber at its entrance until the cone penetrates into the expansion chamber. (18) The invention according to claim (17), wherein said transverse product channels of nozzle insert longitudinally splice said venturi constriction in approximately half of the dimension 15 longitudinal of the product channels. (19) The invention according to claim (17), wherein said outer tapered surface surrounding the venturi constriction outlet is a frusto-conical surface. (20) The invention according to claim (17), wherein said nozzle insert is a unitary member. (21) The invention according to claim (17), wherein said transverse product channels each have an area substantially greater than the venturi constriction outlet orifice area. 25 (22) The invention according to claim (17), where relations between sprayed product and driving agent of about thirteen to one are obtained in the case of products with a viscosity similar to the viscosity of water. (23) The invention according to claim (17), wherein said transverse product channel has an external opening of a shape having curved components and linear components. (24) The invention according to claim (17), wherein the diameter of the opening of the expansion chamber opening and the diameter of the venturi constriction exit orifice are respectively approximately .032 inch and .012 inch or multiple of the same, the expansion chamber opening and venturi constriction exit orifice have areas in a ratio of approximately seven to one.