U.S. patent application number 16/297885 was filed with the patent office on 2019-09-19 for spray tip design and manufacture.
This patent application is currently assigned to Wagner Spray Tech Corportaion. The applicant listed for this patent is Wagner Spray Tech Corportaion. Invention is credited to Ross D. Rossner, Eric R. Seckerson.
Application Number | 20190283054 16/297885 |
Document ID | / |
Family ID | 67904896 |
Filed Date | 2019-09-19 |
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United States Patent
Application |
20190283054 |
Kind Code |
A1 |
Rossner; Ross D. ; et
al. |
September 19, 2019 |
SPRAY TIP DESIGN AND MANUFACTURE
Abstract
A spray tip for a fluid applicator includes a stem configured to
be inserted into the fluid applicator. The stem includes a stem
pre-orifice portion and an insert receiving portion. The spray tip
includes a pre-orifice insert having an inlet and an outlet. The
pre-orifice insert is disposed within the insert receiving portion
and disposed against a rearward shoulder of the stem.
Inventors: |
Rossner; Ross D.; (Leander,
TX) ; Seckerson; Eric R.; (Greenfield, MN) |
|
Applicant: |
Name |
City |
State |
Country |
Type |
Wagner Spray Tech Corportaion |
Plymouth |
MN |
US |
|
|
Assignee: |
Wagner Spray Tech
Corportaion
|
Family ID: |
67904896 |
Appl. No.: |
16/297885 |
Filed: |
March 11, 2019 |
Related U.S. Patent Documents
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Application
Number |
Filing Date |
Patent Number |
|
|
62643265 |
Mar 15, 2018 |
|
|
|
Current U.S.
Class: |
1/1 |
Current CPC
Class: |
B05B 15/65 20180201;
B05B 1/34 20130101; B05B 15/534 20180201; B05B 1/04 20130101; B05B
1/048 20130101; B05B 9/01 20130101 |
International
Class: |
B05B 9/01 20060101
B05B009/01; B05B 1/34 20060101 B05B001/34; B05B 1/04 20060101
B05B001/04 |
Claims
1. A spray tip for a fluid applicator, the spray tip comprising: a
stem configured to be inserted into the fluid applicator, the stem
comprising a stem pre-orifice portion and an insert receiving
portion; a pre-orifice insert comprising an inlet and an outlet;
and wherein the pre-orifice insert is mounted within the insert
receiving portion and disposed against a rearward shoulder of the
stem.
2. The spray tip of claim 1, wherein the pre-orifice insert is
coupled to the pre-orifice receiving portion by a filler metal.
3. The spray tip of claim 2, wherein an external surface of the
pre-orifice insert is disposed in the range 0.0012'' to 0.01'' away
from an internal surface of the insert receiving portion.
4. The spray tip of claim 1, wherein the pre-orifice insert is
coupled to the rearward shoulder by a filler metal.
5. The spray tip of claim 4, wherein an external surface of the
pre-orifice insert is disposed in the range 0.0012'' to 0.01'' away
from a surface of the rearward shoulder.
6. The spray tip of claim 1, wherein the stem pre-orifice portion
comprises a frustum surface that widens in a downstream
direction.
7. The spray tip of claim 1, wherein the stem pre-orifice portion
comprises a first cylindrical surface having a first diameter and a
second cylindrical surface having a second diameter.
8. The spray tip of claim 7, wherein the stem pre-orifice portion
comprises a third cylindrical surface having a third diameter.
9. The spray tip of claim 1, wherein the stem pre-orifice portion
is machined into the stem.
10. The spray tip of claim 1, wherein the pre-orifice insert
comprises a frustum surface that narrows in a downstream
direction.
11. A method of manufacturing a spray tip for a fluid applicator,
the method comprising: creating a channel through a stem of the
spray tip, the channel having a downstream outlet and an upstream
inlet; and inserting a pre-orifice insert into the channel through
the downstream outlet; and securing the pre-orifice insert into the
channel.
12. The method of claim 11, wherein securing the pre-orifice insert
comprises brazing the pre-orifice insert into place.
13. The method of claim 11, wherein securing the pre-orifice insert
comprises applying a bonding agent to the pre-orifice insert.
14. The method of claim 11, wherein creating the channel through
the stem comprises: machining a first hole in the stem; machining a
pre-orifice insert retaining portion; and machining a stem
pre-orifice portion that is upstream from the pre-orifice insert
retaining portion.
15. The method of claim 11, further comprising: grinding the
pre-orifice insert to an insert diameter that is at least 0.001''
smaller than a channel diameter of the channel.
16. The method of claim 11, wherein inserting the pre-orifice
insert comprises disposing the pre-orifice insert against a rear
shoulder of the channel.
17. The method of claim 11, further comprising machining a counter
bore from the upstream inlet side of the channel.
18. A paint spray tip comprising: a cylindrical stem configured to
be inserted and rotated within a paint spray gun; a flag coupled to
the cylindrical stem; a channel disposed through the stem, the
channel having an upstream inlet and a downstream outlet; and
wherein a fluid path in the channel is defined at least in part by
a pre-orifice portion of the cylindrical stem having a plurality of
geometric portions and a pre-orifice insert.
19. The paint spray tip of claim 18, wherein the cylindrical stem
comprises stainless steel and the tip insert comprises tungsten
carbide.
20. The paint spray tip of claim 18, wherein the pre-orifice insert
is coupled to the cylindrical stem by a filler metal.
Description
CROSS-REFERENCE TO RELATED APPLICATIONS
[0001] The present application is based on and claims the benefit
of U.S. Provisional Patent Application Ser. No. 62/643,265, filed
Mar. 15, 2018, the content of which is hereby incorporated by
reference in its entirety.
BACKGROUND
[0002] Spray tips are typically used in a variety of applications
to break up, or atomize, a liquid material for delivery in a
desired spray pattern. Some exemplary applications include, but are
not limited to, applying a coating material such as paint, to a
substrate, an agricultural application such as applying a
fertilizer, insecticide, or herbicide to plants.
[0003] While examples described herein are in the context of
applying paint to a surface, it is understood that the concepts are
not limited to these particular applications. As used herein, paint
includes substances composed of coloring matter, or pigments,
suspended in a liquid medium as well as substances that are free of
coloring matter or pigment. Paint may also include preparatory
coatings, such as primers, and can be opaque, transparent, or
semi-transparent. Some particular examples include, but are not
limited to, latex paint, oil-based paint, stain, lacquers,
varnishes, inks, etc.
SUMMARY
[0004] A spray tip for a fluid applicator includes a stem
configured to be inserted into the fluid applicator. The stem
includes a stem pre-orifice portion and an insert receiving
portion. The spray tip includes a pre-orifice insert having an
inlet and an outlet. The pre-orifice insert is disposed within the
insert receiving portion and disposed against a rearward shoulder
of the stem.
[0005] This summary is provided to introduce a selection of
concepts in a simplified form that are further described below in
the Detailed Description. This summary is not intended to identify
key features or essential features of the claimed subject matter,
is not intended to describe each disclosed embodiment or every
implementation of the claimed subject matter, and is not intended
to be used as an aid in determining the scope of the claimed
subject matter. Many other novel advantages, features, and
relationships will become apparent as this description proceeds.
The figures and the description that follow more particularly
exemplify illustrative embodiments.
BRIEF DESCRIPTION OF THE DRAWINGS
[0006] FIG. 1 is a side view of an example fluid applicator.
[0007] FIG. 2A is a side view showing an example spray tip.
[0008] FIG. 2B is a sectional view showing the example spray tip of
FIG. 2A.
[0009] FIG. 3A is a flow diagram showing an example assembly
operation of a spray tip.
[0010] FIGS. 3B-3C are sectional views showing example steps of the
assembly operation of FIG. 3A.
[0011] FIG. 4A is a flow diagram showing an example assembly
operation of a spray tip.
[0012] FIGS. 4B-F are sectional views showing example steps of the
assembly operation of FIG. 4A.
[0013] FIGS. 5A-5F are sectional views showing example spray tip
assembly configurations.
DETAILED DESCRIPTION OF THE DRAWINGS
[0014] In a fluid spraying system, a pump receives and pressurizes
a fluid, delivers the pressurized fluid to an applicator, which, in
turn, applies the pressurized fluid to a surface using a spray tip
having a geometry selected to emit a desired spray pattern (e.g., a
round pattern, a flat pattern, or a fan pattern, etc.). The fluid
may comprise any fluid applied to surfaces, including, but not
limited to, for example, paint, primer, lacquers, foams, textured
materials, plural components, adhesive components, etc. For the
sake of illustration, and not by limitation, the example of a paint
spraying system will be described in detail.
[0015] FIG. 1 is a side view showing an example applicator 10.
Applicator 10 is used in a fluid spraying system to apply fluid to
a surface (e.g., apply paint to a wall). The fluid enters through
inlet 20, and exits from outlet 50, after passing through a fluid
channel (not explicitly shown) within applicator 10. Tip 30 is
coupled to applicator 10 and has an outlet 50. Tip 30 often is
reversible or removable from applicator 10. Tip 30 may have a
pre-orifice configuration consisting of an internal geometry that
provides a desired spray pattern (e.g., a fan that has minimal
tailings or other beneficial fluid dynamics).
[0016] FIG. 2A is a side view showing an example spray tip 100.
Spray tip 100, for example, could be used in applicator 10. Spray
tip 100 includes stem 102, flag 103 and channel 104. Stem 102 is
typically cylindrical to allow rotation of spray tip 100 in an
applicator (e.g., applicator 10 in FIG. 1). Stem 102 can be formed
of stainless steel, tungsten carbide or another suitable material.
Flag 103 couples to stem 102 and allows a user to rotate and remove
spray tip 100 from applicator 10. Flag 103 can be press fit over
stem or over molded onto stem, but other materials and methods of
attachment are also envisioned. Channel 104 is disposed through
stem 102 and allows fluid flow through spray tip 100. Channel 104
and components disposed within channel 104 can be shaped to
accommodate different fluids and spray patterns.
[0017] FIG. 2B is a sectional view of spray tip 100 along section
A-A in FIG. 2A. As shown, stem 102 includes a channel 104 that
allows fluid flow through stem 102. Within channel 104 are
pre-orifice inserts 106 and 108. Fluid flows in through channel 104
into pre-orifice insert 108 and then into pre-orifice insert 106
before being expelled through orifice 107. The internal structure
of channel 104, pre-orifice insert 108, and pre-orifice insert 106
can greatly affect the spray pattern expelled from orifice 107.
[0018] Spray tip 100 may be manufactured using current assembly
processes for spray tips. Normally, pre-orifice inserts 106 and 108
are manufactured separately from stem 102, and then inserted into
channel 104. Such machining often utilizes outside diameter (OD)
grinding of pre-orifice inserts 106 and 108 (which generally
comprise tungsten carbide) with tight press tolerances. The
pre-orifice inserts 106 and 108 are then inserted into channel 104
of stem 102. This process can create a large amount of scrap.
Additionally, after the OD grinding process, pre-orifice inserts
106 and 108 might not press into stem 102 straight--in which case
the assembly is considered a failure (e.g., the inserts do not
align properly and can affect a desired spray pattern).
[0019] It is desired for a spray tip assembly process that does not
require an OD grind, and where the parts assembly utilizes a slip
fit, with a filler metal in a brazing process used to fill any gap.
In one example, the filler metal used is a silver brazing filler
metal. However, other suitable brazing filler metals, and other
suitable bonding agents, are also envisioned.
[0020] FIG. 3A is a flow diagram showing an example assembly
operation 250. Assembly operation 250 is generally known, however,
the internal geometries shown in FIGS. 3B and 3C, respectively show
low-pressure and high-pressure geometry configurations. Assembly
operation 250 begins at block 252 where a stem is provided for
example stem 200 shown in FIGS. 3B and 3C.
[0021] Assembly operation 250 proceeds at block 254 where channel
202 is formed through stem 200. Channel 202 can be formed in a
variety of different ways as indicated by blocks 256-260. As
indicated by block 256, channel 202 can be machined or drilled
through stem 200. For example, stem 200 is first formed as a
cylinder and channel 202 is then bored into the cylindrical body of
stem 200. As indicated by block 258, channel 202 can be casted or
molded at the same time as stem 200. For example, the cylindrical
shape of stem 200 is formed by a casting process, however, a die is
placed in the casting mold to create channel 202 in the stem
forming casting process. As indicated by block 260, channel 202 can
be formed in other ways as well.
[0022] Assembly operation 250 proceeds at block 262 where
pre-orifice inserts 204 are inserted within the stem 200. Assembly
operation 250 then proceeds to block 264 where the pre-orifice
inserts 204 are secured within stem 200. For example, the inserts
are press fit against block 206 and as fluid flows through the
inserts they are further forced against block 206 and cannot be
pushed through entirely through channel 202. In one example,
pre-orifice inserts 204 are press fit into channel 202 and are held
in by friction.
[0023] FIG. 4A is a flow diagram showing an example assembly
operation 340. Assembly operation 340 will be described with
reference to FIGS. 4B-4F. Assembly operation 340 begins at block
350 where a stem is provided (e.g., stem 300).
[0024] Assembly operation 340 proceeds at block 360 where a channel
302 is formed through the stem 300. Channel 302 is shown formed in
FIG. 4B. Channel 302 can be formed in a variety of different ways
as indicated by blocks 362-366. As indicated by block 362, channel
302 can be machined or drilled through stem 300. For example, a
drill bit, end mill, or other tooling can be used to subtractively
create the channel 302. As indicated by block 364, the channel 302
can be cast or molded into stem 300 during casting or molding of
stem 300. For example, a die is provided through the body of the
mold to create channel 302. As indicate by block 366, channel 302
can be formed in stem 300 in other ways as well.
[0025] Assembly operation 340 proceeds at block 370 where internal
geometry is formed in the stem. As shown in FIG. 4C, internal
geometry can include channel 302. As shown, portion 304-1 includes
a cylindrical geometric portion, portion 304-2 is a frustoconical
geometric portion and portion 304-3 is a cylindrical portion with a
smaller diameter of than portion 304-1. In this instance, portion
304-3 is the unmodified portion of channel 302 shown in FIG. 4B. Of
course these are only examples and more complex geometry can also
be formed in stem 300 such as step steps, spherical or other more
complex shaping. The internal geometry formed in stem 300 can be
formed in a variety of different ways as indicated by blocks
372-376. As indicated by block 372, the internal geometry can be
machined or drilled in stem 300. For example, utilizing the channel
302 as a guide, a tapered bit could drill into channel 302 all the
way down to portion 304-3 and then to form portion 304-1 and 304-2.
(Drilling with this tapered bit all the way through stem 300 would
create only one portion that would be similar to portion 304-1.).
As indicated by block 374, portion(s) 304 can be formed while
casting or molding stem 300. Portion(s) 304 can be formed in other
ways as well, as indicated by block 376.
[0026] Assembly operation 340 proceeds at block 380 where a
pre-orifice retaining portion is formed (as shown in FIG. 4D) and
the pre-orifice insert is inserted within stem 300 (as shown in
FIG. 4E). For example, pre-orifice insert receiving portion 306 can
be formed in similar ways as portions 304 (e.g., drilled, milled,
molded, etc.). After the pre-orifice insert receiving portion 306
is formed, pre-orifice insert 308 can be inserted into pre-orifice
insert receiving portion 306. In some examples, pre-orifice insert
308 is press fit into pre-orifice insert receiving portion 306. In
other examples pre-orifice insert 308 snugly fits into pre-orifice
insert receiving portion 306 such that a press is not needed. In
other examples, pre-orifice insert 308 can loosely fit in
pre-orifice insert receiving portion 306 to allow for more aligning
options. In some examples, more than one pre-orifice insert 308 can
be inserted into pre-orifice insert receiving portion 306.
[0027] Assembly operation 340 proceeds at block 390 where the
pre-orifice insert is secured within the stem. Pre-orifice insert
308 can be secured within the stem in a variety of different ways
as indicated by block 392-398. As indicated by block 392, the
pre-orifice insert 308 can be secured by brazing pre-orifice insert
308 into stem 300. For example, a filler metal can be provided and
brazed from the downstream direction of pre-orifice insert 308 and
fill in a gap between pre-orifice insert 308 and stem 300, securing
pre-orifice insert 308. As indicated by block 394, a bonding agent
can be used to secure pre-orifice insert 308 in stem 300. For
example, a glue, epoxy etc. can be used as a bonding agent to
secure pre-orifice insert 308 into stem 300. As indicated by block
396, pre-orifice insert 308 can be secured in stem 300 by friction
of (e.g., pre-orifice insert 308 tightly fits in pre-orifice insert
receiving portion 306 such that it will not fall out under an
applied fluid pressure flowing through channel 302). Pre-orifice
insert 308 can be secured in other ways as well, as indicated by
block 398. For example, a combination of one or more methods could
be used. For instance, pre-orifice insert 308 may be secured using
friction and a bonding agent.
[0028] FIGS. 5A-5F are sectional views showing example spray tip
assembly configurations. As shown in FIG. 5A, a stem 400 includes a
stem pre-orifice portion 404, configured to guide fluid to
pre-orifice insert 402. Gap 406 between pre-orifice insert 402 and
stem 400, can allow for a fastening material to be applied to
couple pre-orifice insert 402 to stem 400. A fastening material may
include filler or a bonding agent (e.g., a silver brazing filler
metal, an epoxy or a different bonding agent). As shown,
pre-orifice insert 402 is disposed rearwardly against rear shoulder
405 such that fluid does not flow around pre-orifice insert 402. In
some examples, the fastening material couples and/or bonds
pre-orifice insert 402 to rear shoulder 405.
[0029] As shown in FIG. 5B, stem 410 includes a stem pre-orifice
portion 414, configured to guide fluid to a pre-orifice insert 412.
Gap 416 between pre-orifice insert 412 and stem 410 can allow for a
fastening material to be applied to couple pre-orifice insert 412
within stem 410. A fastening material may include filler metal or a
bonding agent (e.g., a silver brazing filler metal, an epoxy or
some other bonding agent). As shown, pre-orifice insert 402 is
disposed rearwardly of forward shoulder 415. In some examples, the
fastening material couples and/or bonds pre-orifice insert 402 to
forward shoulder 415.
[0030] As shown in FIG. 5C, stem 420 includes a stem pre-orifice
portion 424, configured to guide fluid to a pre-orifice insert 422.
Gap 426 between pre-orifice insert 422 and stem 420 can allow for a
fastening material to be applied to couple pre-orifice insert 422
within stem 420. A fastening material may include brazing material
or a bonding agent (e.g., a silver brazing material or an epoxy
bonding agent). As shown, pre-orifice insert 422 is disposed
forwardly against forward shoulder 425 such that fluid under
pressure does not force pre-orifice insert 422 out of stem 420. In
some examples, the fastening material couples and/or bonds
pre-orifice insert 422 to forward shoulder 425.
[0031] As shown in FIG. 5D, stem 430 comprises a stem pre-orifice
portion 434, configured to guide fluid to a pre-orifice insert 432.
Stem pre-orifice portion 434 may be machined or drilled as
described above. Gap 436 between pre-orifice insert 432 and stem
430 can allow for a fastening material to be applied to couple
pre-orifice insert 432 within stem 430. A fastening material may
include brazing material or a bonding agent (e.g., a silver brazing
material or an epoxy bonding agent).
[0032] As shown in FIG. 5E, stem 440 includes a stem pre-orifice
portion 444, configured to guide fluid to a pre-orifice insert 442.
Stem pre-orifice portion 444 includes a cylinder 441, a frustrum
443 and a cylinder 445. In other examples, stem pre-orifice portion
444 can include other internal geometry in different
configurations. For example, stem pre-orifice portion 444 can
include the geometry of any available pre-orifice insert. For
instance, stem pre-orifice portion 444 can remove the need for
having two pre-orifice inserts to create internal concave geometry,
such as a cavity or chamber that is wider than either the inlet or
outlet. Some example geometries can include a plurality of stepped
surfaces, widening surfaces, narrowing surfaces, spherical
surfaces, cylindrical surfaces, etc. Gap 446 between pre-orifice
insert 442 and stem 440 can allow for a fastening material to be
applied to couple pre-orifice insert 442 within stem 440. A
fastening material may include brazing material or a bonding agent
(e.g., a silver brazing material or an epoxy bonding agent). Gap
446 can be determined based on the properties of the brazing
material or bonding agent. In one example, gap 446 includes a
distance in the range 0.000''-0.025.'' In one example, gap 446
includes a distance in the range 0.001''-0.005.''
[0033] As shown, pre-orifice insert 442 is disposed rearwardly
against rear shoulder 447 such that fluid does not flow around
pre-orifice insert 442 and/or in between pre-orifice insert 442 and
stem 440. In some examples, the fastening material couples and/or
bonds pre-orifice insert 442 to rear shoulder 447.
[0034] As shown in FIG. 5F, stem 450 includes a stem pre-orifice
portion 454, configured to guide fluid to a pre-orifice insert 452.
Gap 456 between pre-orifice insert 452 and stem 450 can allow for a
fastening material 457 to be applied to couple pre-orifice insert
442 within stem 440. Fastening material 457 may include brazing
material or a bonding agent (e.g., a silver brazing material or an
epoxy bonding agent).
[0035] Stem 450 includes a counter bore 458. Counter bore 458, as
shown, includes a cylindrical shape. However, in other examples,
counter bore 458 can include other geometries (e.g., frustums,
steps, spheres, etc.). As shown, pre-orifice insert 452 is disposed
rearwardly against rear shoulder 455 such that fluid does not flow
around pre-orifice insert 452. As shown, the fastening material 457
couples and/or bonds pre-orifice insert 452 to rear shoulder
455.
[0036] Although the present invention has been described with
reference to preferred examples, workers skilled in the art will
recognize that changes may be made in form and detail without
departing from the spirit and scope of the invention.
* * * * *