US3304010A

US3304010A - Mixing and spraying apparatus

Info

Publication number: US3304010A
Application number: US389174A
Authority: US
Inventors: James H Cantrell; Faro Charles
Original assignee: Flintkote Co
Current assignee: Flintkote Co
Priority date: 1964-08-12
Filing date: 1964-08-12
Publication date: 1967-02-14
Anticipated expiration: 1984-02-14

Description

Feb i4, 1967 H, QANTRELL ET AL 3,304,010

' MIXING AND SPRAYING APPARATUS Filed Aug. 12, 1964 2 Sheets-Sheet 1 INVENTORS.

BY W m Feb. M, we? J, H CANTRELL ETAL 3304,@10

MIXING AND SPRAYING APPARATUS 2 Sheets-Sheet 2 Filed Aug. 12, l1964 INVENTORS.

United States Patent O 3,304,010 MIXING AND SPRAYING APPARATUS James H. Cantrell and Charles Faro, Riverside, Calif., as-

signors to The Flintkote Company, New York, NY., a corporation of Massachusetts Filed Aug. 12, 1964, Ser. No. 389,174 7 Claims. (Cl. 239-142) This invention relates to apparatus for mixing two streams of liquid and spraying them from a common nozzle. This invention is particularly directed to apparatus for mixing and spraying two liquid components which will polymerize at room temperature to form a solid product.

An important object of this invention is to provide a novel form of unitary mixing and spraynig apparatus in which intimate mixing of two component streams is accomplished prior to delivery to a common nozzle.

Another object is to provide a device of this type having improved means for cleaning all parts of the apparatus contacted by the mixture, and without disassembly of any parts of the mixing apparatus.

A more detailed object is to provide an improved form of power-driven rotary mixer for use in a spraying gun.

A related object is to provide a novel form of header for delivering two tluid components to the mixing chamber.

Other and more detailed objects and advantages will appear hereinafter.

In the drawings:

FIGURE 1 is a perspective view showing a preferred embodiment of our invention.

FIGURE 2 is a side elevation partly in section showing details of construction.

FIGURE 3 is a transverse sectional view partly broken away and taken on lines 3-3 as shown in FIGURE 2.

FIGURE 4 is a transverse sectional View taken substantially on the lines 4-4 as shown in FIGURE 2.

FIGURE 5 is a longitudinal sectional view partly broken away and showing an enlargement of the nozzle parts illustrated in FIGURE 2.

FIGURE 6 is an end elevation of the mixer roto-r.

FIGURE 7 is a longitudinal sectional view taken substantially on the lines 7--7 as shown in FIGURE 6.

FIGURE 8 is a perspective View, on Ia smaller scale, showing one of the ring parts used to construct the mixer rotor.

Referring to the drawings, the housing generally designated 10 includes a first housing portion 11 containing axially spaced bearings 12 and 13 for supporting the rotary drive shaft 14. The housing 10 also includes the second housing portion 15 containing the mixing chamber 16 and connected to the first housing portion 11 by means of threads 17. An air-motor assembly 20 of conventional design has a stub shaft 21 connected by threads 22 and a transverse pin 23 to the drive shaft 14. The enclosing shell 25 of the air motor 20 has a projection 26 which extends into one end of the housing portion 11 and is clamped in position by means of the split ears 27 Iand clamp bolt 28 (see FIGURE l).

Drive shaft 14 extends into the housing portion 15 through a rotary seal assembly 30, which includes the rotary portion 30a tixed to the shaft 14 and engaging the side face of the stationary portion 30b fixed within the housing portion 11. A mixer rotor generally designated 33 is fixed on the forward portion of the drive shaft 14 'and is clamped ybetween a collar 34 and the nut 35. From this description, it will be understood that the air motor turns the drive shaft 14 and that the drive shaft 14 turns the rotor 33 within the mixing chamber 16.

A lateral inlet opening 36 is provided in the housing portion 15, forward of the rotary seal 30 and communi- Mice eating with the mixing chamber 16. A header 37 is connected to this inlet opening 36 by means of the threaded fitting 38. This header 37 has a central discharge opening 39 connected to the fitting 38 and has four parallel inlet ports 41, 42, 43, and 44. The port 41 for liquid base material is connected to the air port 44 by internal passage 45 and -connected to the outlet port 39 by internal passage 46. The port 42 for catalyst is connected to the cleaning solvent port 43 by internal passage 47 and is connected to the outlet port 39 by internal passage 48. Polymerizable liquid material, for example, tolylene diisocyanate, is delivered under pressure to inlet port 42 through conduit 51, valve 52, and ttings 53. Liquid base material or copolymer, for example, hydroxyl-rich polyester, is delivered under pressure to inlet port 41 through conduit 54, valve 55, and through ittings similar to those shown at 53. Valves 52 and 55 are arranged to be operated in unison by means -of a common operating handle 56. Cleaning solvent under pressure is delivered to port 43 through conduit 58, valve 59, and fitting 60. Air under pressure is delivered to inlet 44 through conduit 61, valve 62, and an inlet fitting similar to tting 60. Cleaning solvent valve 59 and air valve 62 are operated separately by separate valve handles.

A nozzle assembly generally designated 65 is positioned at the forward end of the housing part 15 in alignment with the outlet passage 66. The nozzle assembly 65 includes the ported plug 67 connected to the housing portion 15 by means of threads 68, which serve to hold abutting conical surfaces 69 in contact. Mixed reactive materials pass through outlet 66 and through the stepped central bore 70, which extends axially through the member 67. Additional passages 71 in the member 67 communicate with the air passage 72 in the forward end of the housing portion 15. The nozzle head 73 has a central discharge opening 74 through which the mixed reactive materials pass from stepped bore 70 and through which air under pressure passes from the passages 71. The nozzle head 73 is held in place by means of the retainer ring 75 connected by threads 76 to the housing portion 15.

The air conduit is connected ot the air passage 72 by means of the tting 81. Both of the air conduits 61 and 80 are connected to the crosshead 82 upstream from the air motor 20. Air under pressure is supplied through conduit 84 to the crosshead 82 and is then distributed to the conduit 61, to the air motor 20 through ttings 85, and to the air conduit through the needle valve assembly 86.

As shown in FIGURES 6-9, the mixer rotor 33 comprises a plurality of rings 91 and rings 92 positioned in pairs and placed back-to-back. Therrings 91 each have an annular ange 93 provided by the central opening 94. Blades 95 are integrally formed with the annular flange 93 and are circumferentially spaced on the periphery thereof. The blades 95 are wedge-shaped, .and each is provided with converging at surfaces 96 and 97, which intersect to form a blade edge 98. The rings 92 are identical to the rings 91, except that the blades project axially in the opposite direction. Thus, as shown in FIGURE 7, the blades 95 on the rings 91 project axially to the left while the blades 95 on the rings 92 project axially to the right. The blades on adjacent rings are circumferentially staggered. Tubular spacers 100 are interposed between each pair of rings 91 and 92, and the parts are then brazed together to form a unitary rotor 33. The blade edges 98 are then ground so that the tips of the blades 95 have close running clearance within the cylindrical bore 31 of the mixing chamber 16.

The mixer rotor 33 is installed in the chamber 16 by separating the housing parts 11 and 15 on the threads 17. A crosspin 102 on the drive shaft 14 (FIGURE 2) projects into a recess 103 (FIGURE 6), provided on one of the ring fianges in orderto key the mixer rotor 33 to the shaft 14. The shaft 14 passes through the central openings 94 in the rings 91 and 92 and through the central opening in the tubular spacers 100. Rotation of the mixer rotor 33 occurs in the direction of the arrow 104, as shown in FIGURE 6. The wedge-shaped blades 95 act to mix the two materials in a thorough and intimate fashion. The materials are admitted into the mixing chamber 16 through the inlet 36, just in advance of the seal assembly 30, and the materials pass axially through the mixing chamber 16 and emerge throguh the nozzle 65. The intimate mixing achieved by the rotating blades 95 produces a substantially homogeneous product which passes through the discharge opening 66 and through the nozzle 65. Very efficient mixing occurs in a very short period of time.

In operation, the device is grasped in one hand by means of the handle grip 110, which is secured to one end of the air motor 20. The other hand is used to operate the valve handle 56, which controls the ow of the two reactive component streams delivered under pressure to the conduits V51 and 54. The air motor is rotated by a supply of air delivered through the conduit 84, and the exhaust air is discharged through holes 111 in the ring 112. Spraying of the mixture by means of the nozzle 65 is accomplished by air supplied to the nozzle through the needle valve 86, conduit 80, and passageway 72.

When it is desired to interrupt the spraying operation, the valve handle 56 is swung manually to closed position, thereby cutting off the supply of the reactive materials. Cleaning solvent and air are then passed through the header 37 and inlet 36 into the mixing chamber 16 without delay. This is accomplished by manually opening the valves 59 and 62. The solvent cleans all of the internal surfaces of the device which have been contacted by both component streams, and this is quickly accomplished without shutting off the air motor. The two streams of reac tive materials admitted through ports 41 and 42 in the header 37 first meet in the discharge opening 39 in the header. The cleaning solvent and air admitted into the header, following simultaneous shutoff of the reactive materials by means of the common handle 56, serve to clean out the header 37 as well as all of the internal parts downstream from the header. This is .accomplished quickly without any need for disassembling the parts of the tool.

It will be noted that the seal 30 prevents the reactive materials from reaching the shaft bearings 12 and 13, and that these bearings may be supplied` with lubricants through the conventional fitting 101.

Having fully described our invention, it is to be understood that we are not to be limited to the details herein set forth, but that our invention is of the full scope of the appended claims.

We claim:

1. Mixing and spraying apparatus comprising a housing having a cylindrical bore defining a mixing chamber, a mixer rotor mounted coaxially within said bore, the rotor comprising a plurality of axially spaced rings each having a series of wedge-shaped blades fixed on the periphery thereof, the blades having running clearance within said bore, the blades on adjacent rings being circumferentially staggered, a power driven shaft projecting into the bore for rotating the rotor, means for introducing liquid materials under pressure into the mixing chamber, a spray nozzle assembly mounted on the housing, and a discharge passage in the housing connecting the mixing chamber to the nozzle assembly.

2. Mixing and spraying apparatus comprising a housing having a cylindrical bore defining a mixing chamber, a mixer rotor mounted coaxially within said bore, the rotor comprising a plurality of axially spaced rings each having a series of wedge-shaped blades fixed on the periphery thereof, the bladeshaving running clearance Within said bore', the blades on adjacent rings being circumferentially staggered, a power driven shaft projecting into the bore for rotatingy the rotor, means for introducing liquid materials into the mixing chamber, a spray nozzle assembly mounted on the housing, a discharge passage in the housing connecting the mixing chamber to the nozzle assembly, and means for introducing air under pressure into said nozzle assembly to spray the mixture therefrom.

3. Mixing and spraying apparatus comprising a housing having a cylindrical bore defining a mixing chamiber, a mixer rotor mounte-d coaxially Within said bore, a powerdriven shaft projecting into the bore for rotating the rotor, means for introducing Iliquid materials into the mixing chamber, a spray nozzle assembly. mounted on the housing, a discharge passage in the housing connecting the mixing chamber to the nozzle assembly, the rotor comprising a plurality of axially spaced rings each having v.a series of wedge-shaped blades xed on the periphery thereof, the blades having running clearance` within said bore, and means for introducing air under pressure into said nozzle assembly to spray the mixture therefrom.

4. Mixing and spraying apparatus comprising a housing having a cylindrical bore defining a mixing chamber, a mixerrotor mounted coaxially within said bore, a plurality of axially spaced rings each having a series` of wedgeshaped blades fixed on the .periphery thereof, each blade having surfaces defining an axially extending leading edge, the leading edges of the blades having running clearance within said bore, the blades on adjacent rings being circumferentially staggered, a power -driven shaft projecting into the bore for rotating the rotor, means for introducing liquid materials into the mixing chamber, a spray nozzle assembly mounted on the housing, a discharge passage in the housing connecting ythe mixing chamber to the nozzle assembly, and means for introducing air under pressure into said nozzle assembly to spray the mixture therefrom.

5. Mixing Iand spraying apparatus comprising a housing having a `cylindrical bore defining a mixing chamber, a rotor mounted coaxially within the bore, said rotor having a plurality of axially spaced rings each having a series of wedge-sh-aped blades thereon, a power driven yshaft extending into the bore for rotating the rotor, means in cluding a nozzle assembly connected to the housing to receive materials discharged from the mixing chamber, an inlet passage on the housing for delivering Imaterials to be mixed into the mixing chamber, a header having a plurality of inlet ports and la single outlet port, means connecting the outlet port of the header to the inlet passage to the mixing chamber, the header having two internal passageways one extending from a first inlet port to the header outlet and the other extending from a second inlet port to said header outlet, and the header having anl additional passageway extending from the first inlet port to a third inlet port, and means including valve means for controlling ow into each of said header inlet ports.

6. Mixing and spraying apparatus comprising a housing having a cylindrical boredefining a mixing chamber, a rotor mounted coaxially within the bore, said rotor having a plurality of axially spaced Irings each having a series of wedge-shaped blades thereon, a power driven shaft extending into the bore for rotating the rotor, means including a nozzle assembly connected to the housing to receive materials discharged from the mixing chamber, an inlet passage on the `housing for delivering materials to -be mixed into the mixing chamber, a header having four separate inlet ports and a single outlet port, means connecting the outlet port of the header to the inlet passage to the mixing chamber, the header hav-ing first and second internal passageways for supplying reactive materials to said outlet -port of the header, the first of said internal passageways extending from a first inlet port to the header outlet and the second of said internal ways to said outlet port of said header, said third passageway extending from the first inlet port to a third inlet port and the fourth passageway extending from the second inlet port to a fourth inlet port, and means including valve means for controlling flow into each of said header inlet ports.

7. Mixing and spraying apparatus comprising a housing having a cylindrical bore defining a mixing chamber, a rotor 'mounted coaxially `within the bore, said rotor having a plurality of axially spaced rings each having a series of wedge-shaped blades thereon, a power-driven shaft extending into the bore for rotating the rotor, an inlet on the housing for delivering materials to be mixed into the mixing chamber, a nozzle assembly connected to the housing to receive materials discharged from the mixing chamber, a header having four separate inlet ports and a single outlet port, means connecting the outlet port of the header to the inlet passage to the mixing chamber, the header having rst and second internal passageways for supplying reactive materials to said outlet port of the header, the rst of said internal passageways extending from a first inlet port to the header outlet and the second of said internal passageways extending from a second inlet port to said header outlet, and the header having third and fourth internal passageways for respectively supplying air and a solvent through said rst and second internal passageways to said outlet port of said header, said third passageway extending from the rst inlet port to a third inlet port and the fourth passageway extending from the second inlet port to a fourth inlet port.

References Cited by the Examiner UNITED STATES PATENTS 3,035,775 5/1962 Edwards et al. 239-142 3,123,306 3/1964 Bradley 239--336 3,229,9ll 1/1966 Carlson et al. 239-142 EVERETT W. KIRBY, Primary Examiner.

Claims

1. MIXING AND SPRAYING APPARATUS COMPRISING A HOUSING HAVING A CYLINDRICAL BORE DEFINING A MIXING CHAMBER, A MIXER ROTOR MOUNTED COAXIALLY WITHIN SAID BORE, THE ROTOR COMPRISING A PLURALITY OF AXIALLY SPACED RINGS EACH HAVING A SERIES OF WEDGE-SHAPED BLADES FIXED ON THE PERIPHERY THEREOF, THE BLADES HAVING RUNNING CLEARANCE WITHIN SAID BORE, THE BLADES ON ADJACENT RINGS BEING CIRCUMFERENTIALLY STAGGERED, A POWER DRIVEN SHAFT PROJECTING INTO THE BORE FOR ROTATING THE ROTOR, MEANS FOR INTRODUCING LIQUID MATERIALS UNDER PRESSURE INTO THE MIXING CHAMBER,