CA1155094A - Liquid dispensing device - Google Patents
Liquid dispensing deviceInfo
- Publication number
- CA1155094A CA1155094A CA000376106A CA376106A CA1155094A CA 1155094 A CA1155094 A CA 1155094A CA 000376106 A CA000376106 A CA 000376106A CA 376106 A CA376106 A CA 376106A CA 1155094 A CA1155094 A CA 1155094A
- Authority
- CA
- Canada
- Prior art keywords
- nozzle
- needle valve
- bore
- valve
- valve seat
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired
Links
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
- B65B—MACHINES, APPARATUS OR DEVICES FOR, OR METHODS OF, PACKAGING ARTICLES OR MATERIALS; UNPACKING
- B65B51/00—Devices for, or methods of, sealing or securing package folds or closures; Devices for gathering or twisting wrappers, or necks of bags
- B65B51/02—Applying adhesives or sealing liquids
- B65B51/023—Applying adhesives or sealing liquids using applicator nozzles
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05B—SPRAYING APPARATUS; ATOMISING APPARATUS; NOZZLES
- B05B1/00—Nozzles, spray heads or other outlets, with or without auxiliary devices such as valves, heating means
- B05B1/30—Nozzles, spray heads or other outlets, with or without auxiliary devices such as valves, heating means designed to control volume of flow, e.g. with adjustable passages
- B05B1/3033—Nozzles, spray heads or other outlets, with or without auxiliary devices such as valves, heating means designed to control volume of flow, e.g. with adjustable passages the control being effected by relative coaxial longitudinal movement of the controlling element and the spray head
- B05B1/304—Nozzles, spray heads or other outlets, with or without auxiliary devices such as valves, heating means designed to control volume of flow, e.g. with adjustable passages the control being effected by relative coaxial longitudinal movement of the controlling element and the spray head the controlling element being a lift valve
- B05B1/3046—Nozzles, spray heads or other outlets, with or without auxiliary devices such as valves, heating means designed to control volume of flow, e.g. with adjustable passages the control being effected by relative coaxial longitudinal movement of the controlling element and the spray head the controlling element being a lift valve the valve element, e.g. a needle, co-operating with a valve seat located downstream of the valve element and its actuating means, generally in the proximity of the outlet orifice
- B05B1/306—Nozzles, spray heads or other outlets, with or without auxiliary devices such as valves, heating means designed to control volume of flow, e.g. with adjustable passages the control being effected by relative coaxial longitudinal movement of the controlling element and the spray head the controlling element being a lift valve the valve element, e.g. a needle, co-operating with a valve seat located downstream of the valve element and its actuating means, generally in the proximity of the outlet orifice the actuating means being a fluid
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05C—APPARATUS FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05C5/00—Apparatus in which liquid or other fluent material is projected, poured or allowed to flow on to the surface of the work
- B05C5/02—Apparatus in which liquid or other fluent material is projected, poured or allowed to flow on to the surface of the work the liquid or other fluent material being discharged through an outlet orifice by pressure, e.g. from an outlet device in contact or almost in contact, with the work
- B05C5/0225—Apparatus in which liquid or other fluent material is projected, poured or allowed to flow on to the surface of the work the liquid or other fluent material being discharged through an outlet orifice by pressure, e.g. from an outlet device in contact or almost in contact, with the work characterised by flow controlling means, e.g. valves, located proximate the outlet
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Coating Apparatus (AREA)
- Nozzles (AREA)
Abstract
LIQUID DISPENSING DEVICE
Abstract of the Disclosure A liquid dispensing device is disclosed in which there is a movable needle valve operable to open and close a valve seat located within the nozzle of the dispensing device. The needle valve is guided by a guide bushing contained within the nozzle bore. A very small radiused semi-spherical end surface on the nozzle has been found to eliminate stringing of viscous liquid materials dispensed from the nozzle, particularly when the end surface is combined with a needle valve which is maintained con-centric with the nozzle orifice by the guide bushing contained within the nozzle bore.
Abstract of the Disclosure A liquid dispensing device is disclosed in which there is a movable needle valve operable to open and close a valve seat located within the nozzle of the dispensing device. The needle valve is guided by a guide bushing contained within the nozzle bore. A very small radiused semi-spherical end surface on the nozzle has been found to eliminate stringing of viscous liquid materials dispensed from the nozzle, particularly when the end surface is combined with a needle valve which is maintained con-centric with the nozzle orifice by the guide bushing contained within the nozzle bore.
Description
~ 110094 This invention relates to liquid dispensing devices and particularly to devices adapted for dispensing relatively viscous sticky substances such as adhesives,. hot melts, sealing compounds, etc.
There are many applications for dispensers in which it is desirable or necessary to sharply cut off the flow of liquid from the nozzle of the device without any droolîng, drip-ping, or stringing of the liquid from the nozzle after closing of the nozzle. To that end there has heen a long standing need for a dispensing device which would sharply cut off the flow of liquid from the nozzle when the valve of the nozzle is closed~
One such attempt at such sharp cut off of flow is disclosed in U. S. Patent No. 3,~23,.252. According to the disclosure of this patent, sharp cut off may be o~tained by maintaining the conically shaped needle valve of the device centered within a frustoconical.seat of.that device. To that end centering bush-ings are located within the device through which the needle valve .
must pas.s.
Another patent which recognizes the desirability of minimizing dripping or stringing from a nozzle orifice as a desirable end is U. S. Patent No. 3,841,567. According to the disclosure of this patent, dripping or stringing of viscous liquid from the nozzle orifice after cut off of flow may be minimized by maintaining a minimum volume cavity between the cut off valve and the nozzle orifice of the device, I have discovered and one aspect of this invention is predicated upon the discovery that sharp cut off of flow without stringing from a nozzle of a dispensing device may be achieved by providing a small orifice in a very small radius semi-spherical end surface of the nozzle. In the preferred embodiment, the llSS094 nozzle orifice is only .020 inch in diameter and the nozzle tip is semi-spherical in shape and only .084 inch in radius. A
nozzle thus configurated and having a frustoconical valve seat located immediately adjacent the nozzle orifice has been found to result in a nozzle which materially reduces the amount of stringing of material between the nozzle and substrate upon which the material is being deposited.
One consideration of th.is invention is that it provides very sharp cut off of liquid flow from the nozzle whenever the valve of the dispensing device is closed.
Consequently, there is no dripping of liquid from the device after valve closing. If the device is used to dispense very viscous substances such as adhesive or sealing compounds, this unique nozzle and needle valve guide structure.materially reduces stringing of the viscous substance between the nozzle orifice and the substrate on which the viscous substance is deposited.
According to the present invention there is provided a device for.dispensing viscous liquids comprising a body having an axial bore therein, a liquid storage chamber defined at least in part by the bore, a nozzle having an axial bore therein, the bore of the nozzle being in fluid communica-tion with the bore of the body, the nozzle bore having a frustoconical valve seat terminating at a nozzle outl.et o~ifice, an axially movable needle valve having a generally conical section of the distal end thereof, the conical section of the needle being engageablé with the frustoconical valve seat to close the valve, and means for minimizing stringing of viscous material from the nozzle orifice after closing of the needle valve on the valve seat, the last named means comprising a tip on the nozzle having an exterior surface which tapers inwardly toward the nozzle orifice, the tip terminating in a semi-spherical end surface having a radius of approximateiy .084 csm/f)~
l~SS094 inch and the distal end of the needle valve terminating at the nozzle orifice so that there is no cavity between the distal end of the needle valve and the nozzle orifice.
These and other objects and advantages of this invention will be more readily apparent from the following description of the drawings in which:
Figure 1 is a cross sectional view of a dispensing device incorporating the invention of this application.
- 3a -csm/~
~ 11550~4 Figure 2 is an enlarged cross sectional view of the nozzle and nozzle orifice of the dispensing device illustrated in Figure 1.
Figure 3 is a cross sectional view taken on line 3-3 of Figure 2.
Referring to Figures 1 and 2, the invention of this application is illustrated as being being embodied in a dispensing gun 10. This gun 10 includes a generally cylindrical bcdy 11, an end cap 12, and a nozzle 13. The end cap 12, body 11, and nozzle 13 all have a longitudinal bore extending therethrough within which there is located an axially movable needle valve 14 for controlling flow of liquid from the orifice 16 of the nozzle 13.
The valve body 11 contains a stepped axial bore 20, the larger diameter section 21 of which is located at the forward end of the body. This larger diameter sectio~ 21 is intersected by a transverse passage 22 through which liquid is supplied to the gun. AddLtionally, a vent port 23 intersects the smaller diameter section 24 of the bore 20. There is also an air inlet passage 25 which connects the rear end of the valve body with an ~- inlet air port 26.
A bushing 27 is located within the bore 20 of the body 11. This bushing supports seal assemblies 29 and 30 within a bore 28 which extends longitudinally through the bushing.
To prevent fluid flow around the bushing 27, there is an annular groove in the surface of the bushing within which there is an O-ring seal 31. Additionally, there is an O-ring seal 32 contained within an annular channel formed in the valve body 11.
115~094 There is a piston assembly 35 mounted upon the needle ~alve 14 for controlling movement of the needle valve 14. This piston assembly comprises a nut 36 threaded onto a threaded section 37 of the needle valve and a piston retainer ring 38 seal-ingly secured onto the periphery of the nut 36. This retainer ring carries a pair of piston rings 39, 40 between which there i5 sandwiched a resilient gasket 41. Th outer edge of this gasket 41 contacts the interior surface of a cylinder 42 formed on th~
interior of the end cap so as to form a pneumatic seal between the lower side of the piston and the surface of the cylinder 42.
The end cap 12 is bolted onto the upper end of the body 11 by bolts (not shown). Preferably, a resilient gasket seal 44 is located between the contacting surfaces of the end cap and the body.
Communicating with the cylinder 42 formed in the end cap 12, there is a stepped axial bore 45 which extends through the end cap. The upper smaller diameter section 46 of this stepped bore is threaded and receives an adjustment stud 47. A
lock nut 48 secures the stud 47 in a position of axial adjust-ment~
Between the bottom surface of the stud 47 and the top of the piston assembly 35, there is a compression spring 5Q.
The upper end of this compression spring 50 contacts the bottom surface of the stud 47 and the lower end of the spring 50 contacts the top surface of a spring retainer 51. This spring retainer is supported upon the top surface of the piston assembly nut 36. By adjusting the axial position of the stud 47 within the bore 46, the closing force for retaining the needle valve closed may be adjusted or varied.
The dispensing device heretofore described except for the configuration of the needle valve 14 and the nozzle 13, is conventional and per se, forms no part of the invention of this application. Otherwise expressed, the invention of this applicat-ion resides in the construction of the needle valve 14 and the nozzle 13.
With particular reference to Figures 2 and 3, it will be seen that the nozzle 13 contains a generally cylindrical . axial bore 60 which extends forwardly from the rear of the nozzle until it intersects a frustoconical valve seat 61 at the forward end of the nozzle. This frustoconical valve seat 61 in turn communicates with a small cylindrical nozzle orifice 16 through which li~uid exits from the nozzle. In a preferred embodiment,thi 3 orifice is approximately .020 inch in diameter and the valve seat 61 defines an included angle of 34.
Press fit into the bore 60 there is a guide bushing 90, This bùshing 90 has a central axial bore 91 through which a .
needle valve 14 passes. Additionally, it has four equidistantly spaced longitudinal channels or grooves 92 in its peripheral surface through which liquid may flow from the interior of the gun body 11 to the nozzle orifice 16 as is explained more fully hereinafter.
At its forward end the needle valve 14 has a cylindrical section 65 slideably received within the bore 91 of the guide bushing 90. This sliding fit requires that the bore 91 be slight-ly larger than the cylindrical section 65 of the needle, but that there be no more than approximately .002 inch clearance between the bore and the needle valve~ Preferably, the clearance is approximat y .00 inch.
~50~
At its forward end the needle valve 14 terminates in a frustoconical shaped valve section 66 engageable with the frusto-conical shaped valve seat 61 in the nozzle 13. The frustoconical shaped end section 66 of the needle valve defines an included angl , of approximately 30 while the valve seat 61 defines an in-cluded angle B of approximately 34. The exterior surface 67 of the nozzle tip is also tapered at approximately 34. Con-sequently, there is some slight clearance between the frustoconica 1 shaped section of the needle valve 65 and the valve seat 61 at the rearward end of the valve seat.
The nozzle 13 has a cylindrical hub section 70 which is tightly fitted within the large diameter section 21 of cylindri-cal bore 20 in the body 11. Forwardly of the hub section 70, therl , is a flange 71 which is bolted to the forward end of the body 11 by conventional threaded connectors 73. Preferably, there is an O-ring seal 74 contained within a channel 75 formed in the for~ard end of the dispenser body 11. This seal 74 prevents any leakage of liquid between the nozzle 13 and the body 11.
To prevent any movement of the bushing 27 within the borl , 20, there is a spring 76 located between the rearward end of the nozzle 13 and the forward end of the bush~ing seal assembly 29.
This spring 76 biases the bushing rearwardly and maintains a flang~
77 of the bushing engaged with a shoulder 78 formed in the bore 20.
In operation, liquid under pressure is supplied to the liquid inlet port 80 of the device. This port communicates via passage 22 with the bore 20 of the body 10 such that liquid supplied to the port 80 flows into a liquid storage chamber 81 contained within the device. This chamber 81 is in turn open to ~the longit ~inal passages 92 within the guide oushing 9~.
_ 7 _ Whenever the device is to be actuated so as to permit liquid to flow from the storage cham~er 81 through the passages 92 and past the valve seat 61 to the orifice 61, high pressure air is supplied to the port 26. This high pressure air overcomes the bias of the spring 50 and causes the piston assembly 35 to move upwardly, carrying with it needle valve 14. This upward move _ ment of the needle valve results in the lifting of the conical section 66 of the valve off of the seat 61 and, results in flow of liquid from the storage chamber 81 through the passages 92 via the valve tQ the orifice 16. This flow continues so long as the air pressure is maintained to the port-26. When that air pressure is relieved, as for example by actuation of a controlling pneumatic valve (not shown) the spring 5~ effects closing movement of the valve.
The most important advantage of this invention resides in the fact that when it is used to dispense high viscosity liquids such as adhesives or sealing gasket material compounds, etc., it materially eliminates or reduces stringing of material ~from the nozzle orifice after valve closing. This advantage is apparently partially attributable to the needle valve guide surface being in close proximity to the nozzle valve seat and partially attributable to the small radius semi-spherical tip on the nozzle. The needle valve guide surfaces on the guide bushing apparently maintains the needle valve concentric to the valve seat with the result that sharp cut off of flow and the reduction or elimination of stringing is enhanced and apparently the small radius semi-spherical tip on the nozzle also contributes to this reduction.
1~55094 While I have described only a single preferred embodi-ment of my invention, persons skilled in this art will appreciate changes and modifications which may be made without departing . from the spirit of my invention. Therefore, I do not intend to be limited except by the scope of the following appended claims:
There are many applications for dispensers in which it is desirable or necessary to sharply cut off the flow of liquid from the nozzle of the device without any droolîng, drip-ping, or stringing of the liquid from the nozzle after closing of the nozzle. To that end there has heen a long standing need for a dispensing device which would sharply cut off the flow of liquid from the nozzle when the valve of the nozzle is closed~
One such attempt at such sharp cut off of flow is disclosed in U. S. Patent No. 3,~23,.252. According to the disclosure of this patent, sharp cut off may be o~tained by maintaining the conically shaped needle valve of the device centered within a frustoconical.seat of.that device. To that end centering bush-ings are located within the device through which the needle valve .
must pas.s.
Another patent which recognizes the desirability of minimizing dripping or stringing from a nozzle orifice as a desirable end is U. S. Patent No. 3,841,567. According to the disclosure of this patent, dripping or stringing of viscous liquid from the nozzle orifice after cut off of flow may be minimized by maintaining a minimum volume cavity between the cut off valve and the nozzle orifice of the device, I have discovered and one aspect of this invention is predicated upon the discovery that sharp cut off of flow without stringing from a nozzle of a dispensing device may be achieved by providing a small orifice in a very small radius semi-spherical end surface of the nozzle. In the preferred embodiment, the llSS094 nozzle orifice is only .020 inch in diameter and the nozzle tip is semi-spherical in shape and only .084 inch in radius. A
nozzle thus configurated and having a frustoconical valve seat located immediately adjacent the nozzle orifice has been found to result in a nozzle which materially reduces the amount of stringing of material between the nozzle and substrate upon which the material is being deposited.
One consideration of th.is invention is that it provides very sharp cut off of liquid flow from the nozzle whenever the valve of the dispensing device is closed.
Consequently, there is no dripping of liquid from the device after valve closing. If the device is used to dispense very viscous substances such as adhesive or sealing compounds, this unique nozzle and needle valve guide structure.materially reduces stringing of the viscous substance between the nozzle orifice and the substrate on which the viscous substance is deposited.
According to the present invention there is provided a device for.dispensing viscous liquids comprising a body having an axial bore therein, a liquid storage chamber defined at least in part by the bore, a nozzle having an axial bore therein, the bore of the nozzle being in fluid communica-tion with the bore of the body, the nozzle bore having a frustoconical valve seat terminating at a nozzle outl.et o~ifice, an axially movable needle valve having a generally conical section of the distal end thereof, the conical section of the needle being engageablé with the frustoconical valve seat to close the valve, and means for minimizing stringing of viscous material from the nozzle orifice after closing of the needle valve on the valve seat, the last named means comprising a tip on the nozzle having an exterior surface which tapers inwardly toward the nozzle orifice, the tip terminating in a semi-spherical end surface having a radius of approximateiy .084 csm/f)~
l~SS094 inch and the distal end of the needle valve terminating at the nozzle orifice so that there is no cavity between the distal end of the needle valve and the nozzle orifice.
These and other objects and advantages of this invention will be more readily apparent from the following description of the drawings in which:
Figure 1 is a cross sectional view of a dispensing device incorporating the invention of this application.
- 3a -csm/~
~ 11550~4 Figure 2 is an enlarged cross sectional view of the nozzle and nozzle orifice of the dispensing device illustrated in Figure 1.
Figure 3 is a cross sectional view taken on line 3-3 of Figure 2.
Referring to Figures 1 and 2, the invention of this application is illustrated as being being embodied in a dispensing gun 10. This gun 10 includes a generally cylindrical bcdy 11, an end cap 12, and a nozzle 13. The end cap 12, body 11, and nozzle 13 all have a longitudinal bore extending therethrough within which there is located an axially movable needle valve 14 for controlling flow of liquid from the orifice 16 of the nozzle 13.
The valve body 11 contains a stepped axial bore 20, the larger diameter section 21 of which is located at the forward end of the body. This larger diameter sectio~ 21 is intersected by a transverse passage 22 through which liquid is supplied to the gun. AddLtionally, a vent port 23 intersects the smaller diameter section 24 of the bore 20. There is also an air inlet passage 25 which connects the rear end of the valve body with an ~- inlet air port 26.
A bushing 27 is located within the bore 20 of the body 11. This bushing supports seal assemblies 29 and 30 within a bore 28 which extends longitudinally through the bushing.
To prevent fluid flow around the bushing 27, there is an annular groove in the surface of the bushing within which there is an O-ring seal 31. Additionally, there is an O-ring seal 32 contained within an annular channel formed in the valve body 11.
115~094 There is a piston assembly 35 mounted upon the needle ~alve 14 for controlling movement of the needle valve 14. This piston assembly comprises a nut 36 threaded onto a threaded section 37 of the needle valve and a piston retainer ring 38 seal-ingly secured onto the periphery of the nut 36. This retainer ring carries a pair of piston rings 39, 40 between which there i5 sandwiched a resilient gasket 41. Th outer edge of this gasket 41 contacts the interior surface of a cylinder 42 formed on th~
interior of the end cap so as to form a pneumatic seal between the lower side of the piston and the surface of the cylinder 42.
The end cap 12 is bolted onto the upper end of the body 11 by bolts (not shown). Preferably, a resilient gasket seal 44 is located between the contacting surfaces of the end cap and the body.
Communicating with the cylinder 42 formed in the end cap 12, there is a stepped axial bore 45 which extends through the end cap. The upper smaller diameter section 46 of this stepped bore is threaded and receives an adjustment stud 47. A
lock nut 48 secures the stud 47 in a position of axial adjust-ment~
Between the bottom surface of the stud 47 and the top of the piston assembly 35, there is a compression spring 5Q.
The upper end of this compression spring 50 contacts the bottom surface of the stud 47 and the lower end of the spring 50 contacts the top surface of a spring retainer 51. This spring retainer is supported upon the top surface of the piston assembly nut 36. By adjusting the axial position of the stud 47 within the bore 46, the closing force for retaining the needle valve closed may be adjusted or varied.
The dispensing device heretofore described except for the configuration of the needle valve 14 and the nozzle 13, is conventional and per se, forms no part of the invention of this application. Otherwise expressed, the invention of this applicat-ion resides in the construction of the needle valve 14 and the nozzle 13.
With particular reference to Figures 2 and 3, it will be seen that the nozzle 13 contains a generally cylindrical . axial bore 60 which extends forwardly from the rear of the nozzle until it intersects a frustoconical valve seat 61 at the forward end of the nozzle. This frustoconical valve seat 61 in turn communicates with a small cylindrical nozzle orifice 16 through which li~uid exits from the nozzle. In a preferred embodiment,thi 3 orifice is approximately .020 inch in diameter and the valve seat 61 defines an included angle of 34.
Press fit into the bore 60 there is a guide bushing 90, This bùshing 90 has a central axial bore 91 through which a .
needle valve 14 passes. Additionally, it has four equidistantly spaced longitudinal channels or grooves 92 in its peripheral surface through which liquid may flow from the interior of the gun body 11 to the nozzle orifice 16 as is explained more fully hereinafter.
At its forward end the needle valve 14 has a cylindrical section 65 slideably received within the bore 91 of the guide bushing 90. This sliding fit requires that the bore 91 be slight-ly larger than the cylindrical section 65 of the needle, but that there be no more than approximately .002 inch clearance between the bore and the needle valve~ Preferably, the clearance is approximat y .00 inch.
~50~
At its forward end the needle valve 14 terminates in a frustoconical shaped valve section 66 engageable with the frusto-conical shaped valve seat 61 in the nozzle 13. The frustoconical shaped end section 66 of the needle valve defines an included angl , of approximately 30 while the valve seat 61 defines an in-cluded angle B of approximately 34. The exterior surface 67 of the nozzle tip is also tapered at approximately 34. Con-sequently, there is some slight clearance between the frustoconica 1 shaped section of the needle valve 65 and the valve seat 61 at the rearward end of the valve seat.
The nozzle 13 has a cylindrical hub section 70 which is tightly fitted within the large diameter section 21 of cylindri-cal bore 20 in the body 11. Forwardly of the hub section 70, therl , is a flange 71 which is bolted to the forward end of the body 11 by conventional threaded connectors 73. Preferably, there is an O-ring seal 74 contained within a channel 75 formed in the for~ard end of the dispenser body 11. This seal 74 prevents any leakage of liquid between the nozzle 13 and the body 11.
To prevent any movement of the bushing 27 within the borl , 20, there is a spring 76 located between the rearward end of the nozzle 13 and the forward end of the bush~ing seal assembly 29.
This spring 76 biases the bushing rearwardly and maintains a flang~
77 of the bushing engaged with a shoulder 78 formed in the bore 20.
In operation, liquid under pressure is supplied to the liquid inlet port 80 of the device. This port communicates via passage 22 with the bore 20 of the body 10 such that liquid supplied to the port 80 flows into a liquid storage chamber 81 contained within the device. This chamber 81 is in turn open to ~the longit ~inal passages 92 within the guide oushing 9~.
_ 7 _ Whenever the device is to be actuated so as to permit liquid to flow from the storage cham~er 81 through the passages 92 and past the valve seat 61 to the orifice 61, high pressure air is supplied to the port 26. This high pressure air overcomes the bias of the spring 50 and causes the piston assembly 35 to move upwardly, carrying with it needle valve 14. This upward move _ ment of the needle valve results in the lifting of the conical section 66 of the valve off of the seat 61 and, results in flow of liquid from the storage chamber 81 through the passages 92 via the valve tQ the orifice 16. This flow continues so long as the air pressure is maintained to the port-26. When that air pressure is relieved, as for example by actuation of a controlling pneumatic valve (not shown) the spring 5~ effects closing movement of the valve.
The most important advantage of this invention resides in the fact that when it is used to dispense high viscosity liquids such as adhesives or sealing gasket material compounds, etc., it materially eliminates or reduces stringing of material ~from the nozzle orifice after valve closing. This advantage is apparently partially attributable to the needle valve guide surface being in close proximity to the nozzle valve seat and partially attributable to the small radius semi-spherical tip on the nozzle. The needle valve guide surfaces on the guide bushing apparently maintains the needle valve concentric to the valve seat with the result that sharp cut off of flow and the reduction or elimination of stringing is enhanced and apparently the small radius semi-spherical tip on the nozzle also contributes to this reduction.
1~55094 While I have described only a single preferred embodi-ment of my invention, persons skilled in this art will appreciate changes and modifications which may be made without departing . from the spirit of my invention. Therefore, I do not intend to be limited except by the scope of the following appended claims:
Claims
THE EMBODIMENTS OF THE INVENTION IN WHICH AN EXCLUSIVE
PROPERTY OR PRIVILEGE IS CLAIMED ARE DEFINED AS FOLLOWS:
(1) A device for dispensing viscous liquids comprising a nozzle having an axial bore therein, said bore having a frustoconical valve seat formed therein, said frustoconical valve seat terminating at a nozzle outlet orifice, an axially movable needle valve having a generally conically shaped section on the distal end thereof, said conically shaped distal end section of said needle valve being engageable with said frustoconical valve seat to close said valve, a bushing located within said nozzle, said bushing having a needle valve guide surface formed therein, said needle valve guide surface being engageable with said needle valve at a location spaced from said valve seat so as to guide movement of said needle valve along a longitudinal axis concentric to said valve seat, passageway means for supplying liquid to said nozzle bore forwardly of said bushing, and means for minimizing stringing of the viscous liquids from the nozzle orifice after closing of the needle valve on the valve seat, said means including a tip on said nozzle having an exterior surface which tapers inwardly toward said nozzle orifice, said tip terminating in a semi-spherical end surface, and said nozzle orifice being located in said semi-spherical end surface so that there is no cavity between the distal end of said needle valve and said nozzle orifice.
(2) The liquid dispensing apparatus of Claim 1 wherein said passageway means is formed by longitudinal grooves located in said bushing, said grooves being remote from said needle valve guide surface such that said grooves do not interrupt said guide surface.
(3) The liquid dispensing device of Claim 1 wherein said needle valve guide surface extends over a substantial portion of the axial length of said nozzle.
(4) A device for dispensing viscous liquids comprising a body having an axial bore therein, a liquid storage chamber defined at least in part by said bore, a nozzle having an axial bore therein, said bore of said nozzle being in fluid communication with said bore of said body, said nozzle bore having a frustoconical valve seat terminating at a nozzle outlet orifice, an axially movable needle valve having a generally conical section of the distal end thereof, said conical sect-ion of said needle being engageable with said frustoconical valve seat to close said valve, and means for minimizing stringing of viscous material from-the nozzle orifice after closing of said needle valve on said valve seat, said last named means comprising a tip on said nozzle having an exterior surface which tapers inwardly toward said nozzle orifice, said tip terminating in a semi-spherical end surface having a radius of approximately .084 inch and said distal end of said needle valve terminating at said nozzle orifice so that there is no cavity between the distal end of the needle valve and the nozzle orifice.
(5) The device of Claim 4 wherein said taper of said exterior surface of said nozzle tip defines an included angle of approximately 34°.
(6) A liquid dispensing device comprising a body having an axial bore therein, a nozzle mounted in one end of said bore, said nozzle having an axially extending bore, a generally frusto-conical shaped valve seat formed in said nozzle bore, said valve seat terminating in a forwardly disposed outlet orifice, a needle valve having a generally conically shaped valve portion on the distal end thereof engageable with said valve seat, said needle valve being axially movable within said bores of said body and said nozzle, fluid motor means mounted in said bore of said body for effecting movement of said needle valve into and out of sealing engagement with said valve seat, guide means comprising a guide bushing located within said nozzle and having an axial bore guide surface engageable with an intermediate cylindrical section of said needle valve to guide movement of said needle valve along a longitudinal axis concentric to said valve seat, passageway means for supplying liquid to said nozzle bore forwardly of said guide bushing, said passageway means being remote from said axial bore guide surface of said guide bushing such that said passageway means does not inter-sect and interrupt said axial bore guide surface of said guide bushing, and means for minimizing stringing of the viscous liquids from the nozzle orifice after closing of the needle valve on the valve seat, said means including a tip on said nozzle having an exterior surface which tapers inwardly toward said nozzle orifice, said tip terminating in a semi-spherical end surface, and said nozzle orifice being located in said semi-spherical end surface of the nozzle so that there is no cavity between the distal end of said needle valve and said nozzle orifice.
(7) The liquid dispensing device of Claim 6 in which said bore of said guide bushing is engageable with said needle valve over a substantial portion of the axial length of said nozzle.
(8) The liquid dispensing device of Claim 6 wherein said passageway means comprises a plurality of longitudinally extend-ing grooves formed in the peripheral surface of said guide bushing.
PROPERTY OR PRIVILEGE IS CLAIMED ARE DEFINED AS FOLLOWS:
(1) A device for dispensing viscous liquids comprising a nozzle having an axial bore therein, said bore having a frustoconical valve seat formed therein, said frustoconical valve seat terminating at a nozzle outlet orifice, an axially movable needle valve having a generally conically shaped section on the distal end thereof, said conically shaped distal end section of said needle valve being engageable with said frustoconical valve seat to close said valve, a bushing located within said nozzle, said bushing having a needle valve guide surface formed therein, said needle valve guide surface being engageable with said needle valve at a location spaced from said valve seat so as to guide movement of said needle valve along a longitudinal axis concentric to said valve seat, passageway means for supplying liquid to said nozzle bore forwardly of said bushing, and means for minimizing stringing of the viscous liquids from the nozzle orifice after closing of the needle valve on the valve seat, said means including a tip on said nozzle having an exterior surface which tapers inwardly toward said nozzle orifice, said tip terminating in a semi-spherical end surface, and said nozzle orifice being located in said semi-spherical end surface so that there is no cavity between the distal end of said needle valve and said nozzle orifice.
(2) The liquid dispensing apparatus of Claim 1 wherein said passageway means is formed by longitudinal grooves located in said bushing, said grooves being remote from said needle valve guide surface such that said grooves do not interrupt said guide surface.
(3) The liquid dispensing device of Claim 1 wherein said needle valve guide surface extends over a substantial portion of the axial length of said nozzle.
(4) A device for dispensing viscous liquids comprising a body having an axial bore therein, a liquid storage chamber defined at least in part by said bore, a nozzle having an axial bore therein, said bore of said nozzle being in fluid communication with said bore of said body, said nozzle bore having a frustoconical valve seat terminating at a nozzle outlet orifice, an axially movable needle valve having a generally conical section of the distal end thereof, said conical sect-ion of said needle being engageable with said frustoconical valve seat to close said valve, and means for minimizing stringing of viscous material from-the nozzle orifice after closing of said needle valve on said valve seat, said last named means comprising a tip on said nozzle having an exterior surface which tapers inwardly toward said nozzle orifice, said tip terminating in a semi-spherical end surface having a radius of approximately .084 inch and said distal end of said needle valve terminating at said nozzle orifice so that there is no cavity between the distal end of the needle valve and the nozzle orifice.
(5) The device of Claim 4 wherein said taper of said exterior surface of said nozzle tip defines an included angle of approximately 34°.
(6) A liquid dispensing device comprising a body having an axial bore therein, a nozzle mounted in one end of said bore, said nozzle having an axially extending bore, a generally frusto-conical shaped valve seat formed in said nozzle bore, said valve seat terminating in a forwardly disposed outlet orifice, a needle valve having a generally conically shaped valve portion on the distal end thereof engageable with said valve seat, said needle valve being axially movable within said bores of said body and said nozzle, fluid motor means mounted in said bore of said body for effecting movement of said needle valve into and out of sealing engagement with said valve seat, guide means comprising a guide bushing located within said nozzle and having an axial bore guide surface engageable with an intermediate cylindrical section of said needle valve to guide movement of said needle valve along a longitudinal axis concentric to said valve seat, passageway means for supplying liquid to said nozzle bore forwardly of said guide bushing, said passageway means being remote from said axial bore guide surface of said guide bushing such that said passageway means does not inter-sect and interrupt said axial bore guide surface of said guide bushing, and means for minimizing stringing of the viscous liquids from the nozzle orifice after closing of the needle valve on the valve seat, said means including a tip on said nozzle having an exterior surface which tapers inwardly toward said nozzle orifice, said tip terminating in a semi-spherical end surface, and said nozzle orifice being located in said semi-spherical end surface of the nozzle so that there is no cavity between the distal end of said needle valve and said nozzle orifice.
(7) The liquid dispensing device of Claim 6 in which said bore of said guide bushing is engageable with said needle valve over a substantial portion of the axial length of said nozzle.
(8) The liquid dispensing device of Claim 6 wherein said passageway means comprises a plurality of longitudinally extend-ing grooves formed in the peripheral surface of said guide bushing.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US14857780A | 1980-05-09 | 1980-05-09 | |
| US148,577 | 1980-05-09 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1155094A true CA1155094A (en) | 1983-10-11 |
Family
ID=22526372
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA000376106A Expired CA1155094A (en) | 1980-05-09 | 1981-04-23 | Liquid dispensing device |
Country Status (4)
| Country | Link |
|---|---|
| EP (1) | EP0040068B1 (en) |
| JP (1) | JPS574267A (en) |
| CA (1) | CA1155094A (en) |
| DE (1) | DE3171682D1 (en) |
Families Citing this family (13)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0066017A1 (en) * | 1981-05-27 | 1982-12-08 | Nordson Corporation | Liquid dispensing device |
| DE3236647C2 (en) * | 1982-10-04 | 1985-02-28 | Intec Bielenberg GmbH & Co KG, 5014 Kerpen | Device for dispensing thick materials, in particular sealants and adhesives |
| JPH0741185B2 (en) * | 1986-02-12 | 1995-05-10 | ソニー株式会社 | Viscous substance coating device |
| JPH075910B2 (en) * | 1986-03-22 | 1995-01-25 | 忠生 白石 | Sanitary products containing encapsulated enzymes |
| FR2617062B1 (en) * | 1987-03-24 | 1990-04-27 | Projets Nouveaux | HOT-MELT ADHESIVE DISPENSER-DOSER |
| JPH01168373A (en) * | 1987-12-22 | 1989-07-03 | Bridgestone Corp | Identification mark coating device |
| GB9219498D0 (en) * | 1992-09-15 | 1992-10-28 | Lechler Ltd | Valves |
| IE940697A1 (en) * | 1994-09-06 | 1996-03-06 | Loctite Ireland Ltd | Applicator for liquids such as adhesives |
| US5924607A (en) * | 1996-02-16 | 1999-07-20 | Nireco Corporation | Hot melt applicator and nozzle used therefor |
| CN103894316B (en) * | 2012-12-27 | 2017-02-08 | 鸿富锦精密工业（深圳）有限公司 | Dispensing method of light emitting diode |
| CN103785560B (en) * | 2013-04-27 | 2016-12-07 | 广州海鸥卫浴用品股份有限公司 | Nozzle needle for mjector |
| DE102018114008A1 (en) * | 2018-06-12 | 2019-12-12 | Marcus Herrmann | Apparatus and method for producing three-dimensional objects |
| CN114453196B (en) * | 2022-02-22 | 2024-01-12 | 长子县金鑫机械电杆有限公司 | Sealing and dispensing system for flange plate |
Family Cites Families (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB398788A (en) * | 1931-12-12 | 1933-09-21 | Otto Treichel | Improvements in or relating to apparatus for spraying liquids |
| US2670241A (en) * | 1951-05-22 | 1954-02-23 | George S Pyles | Flow gun |
| US2865675A (en) * | 1956-04-13 | 1958-12-23 | Vernon D Roosa | Fuel injection nozzle |
| US2983480A (en) * | 1956-07-02 | 1961-05-09 | Grace W R & Co | Valve stem and reciprocating shaft seal |
| FR1463455A (en) * | 1966-01-10 | 1966-12-23 | Pressure regulator for jet launcher | |
| DE2055127A1 (en) * | 1970-11-10 | 1972-05-31 | Cast, Adolf, Dipl.-Ing., 7311 Oberlenningen | Gluing apparatus and method |
| US4066188A (en) * | 1976-08-10 | 1978-01-03 | Nordson Corporation | Thermoplastic adhesive dispenser having an internal heat exchanger |
-
1981
- 1981-04-23 CA CA000376106A patent/CA1155094A/en not_active Expired
- 1981-05-08 EP EP19810302056 patent/EP0040068B1/en not_active Expired
- 1981-05-08 DE DE8181302056T patent/DE3171682D1/en not_active Expired
- 1981-05-09 JP JP6892281A patent/JPS574267A/en active Pending
Also Published As
| Publication number | Publication date |
|---|---|
| JPS574267A (en) | 1982-01-09 |
| EP0040068A1 (en) | 1981-11-18 |
| EP0040068B1 (en) | 1985-08-07 |
| DE3171682D1 (en) | 1985-09-12 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| MKEX | Expiry |