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Patent 2035026 Summary

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Claims and Abstract availability

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(12) Patent: (11) CA 2035026
(54) English Title: SEPARATOR FOR PRODUCING MOIST, GRANULAR BLASTING AGENT
(54) French Title: SEPARATEUR POUR LA FABRICATION D'UN EXPLOSIF GRANULAIRE HUMIDE
Status: Expired
Bibliographic Data
(52) Canadian Patent Classification (CPC):
  • 51/7
(51) International Patent Classification (IPC):
  • B24C 7/00 (2006.01)
(72) Inventors :
  • KEIZERS, SIGRID (Germany)
(73) Owners :
  • KEIZERS, SIGRID (Germany)
(71) Applicants :
  • KEIZERS, SIGRID (Germany)
(74) Agent: STIKEMAN ELLIOTT LLP
(74) Associate agent:
(45) Issued: 2001-10-09
(86) PCT Filing Date: 1990-06-09
(87) Open to Public Inspection: 1991-01-10
Examination requested: 1997-06-06
Availability of licence: N/A
(25) Language of filing: English

Patent Cooperation Treaty (PCT): Yes
(86) PCT Filing Number: PCT/EP1990/000902
(87) International Publication Number: WO1991/000164
(85) National Entry: 1991-02-22

(30) Application Priority Data:
Application No. Country/Territory Date
G 89 07 765.2 Germany 1989-06-24
EP 90/00902 Germany 1990-06-09

Abstracts

English Abstract





The invention relates to a device for blasting with a moist granular me-
dium in which a water/blasting agent mixture with a relatively high moisture
content is conveyed by a stream of air to a blasting pipe. The invention is
aimed at keeping the sand fluid with a relatively high addition of water as
far
as its entry (1) into the conveyor agent pipe and ensuring that after its exit
(2)
from the blasting pipe it contains only just enough residual moisture to pre-
vent dust formation either through the discharging blasting agent or from sur-
face particles removed. This aim is achieved by the invention in that a device
(5) is fitted in the conveyor circuit of the device for blasting with moist
granu-
lar agents in front of the blasting agent entry to separate out the
superfluous
water.


Claims

Note: Claims are shown in the official language in which they were submitted.





THE EMBODIMENTS OF THE INVENTION IN WHICH AN EXCLUSIVE
PROPERTY OR PRIVILEGE IS CLAIMED ARE DEFINED AS FOLLOWS:

1. A separator for providing a moist, granular blasting agent from a
mixture of propellant, water and granular agent comprising:
a housing;
a screen In said housing dividing the interior of the housing into an upper
chamber and a lower chamber;
a first inlet in said housing for introducing the mixture into said upper
chamber above said screen;
at least one of an impact plate and a deflector in said upper chamber for
decelerating the mixture flowing into said upper chamber through said first
inlet whereby water is caused to drop from the mixture through said
screen into the lower chamber leaving moist, granular blasting agent; and
an outlet in said housing for discharging said moist, granular blasting
agent from the housing.

2. The separator of claim 1, including an impact plate in said upper
chamber for decelerating a mixture entering the upper chamber through said
first
inlet; and a deflector in said upper chamber downstream of said impact plate
in
the direction of fluid flow to the outlet for diverting the flow of moist,
granular
agent to the outlet.

3. The separator of claim 2, wherein said impact plate extends
between a top wall of said housing and said screen.

4. The separator of claim 3, including gaps between the ends of said
impact plate and the side wall of said housing.

7





5. The separator of any one of claims 1 to 4, including a drain in the
bottom of Bald housing for discharging water from said lower chamber; a second
inlet for introducing a fluid into the lower chamber for cleaning said screen;
and a
valve in said second inlet for opening and closing said second inlet.

6, The separator according to claim 1, including a plurality of deflector
plates extending across said upper chamber perpendicular to the direction of
fluid flow between the first inlet and the outlet, and staggered openings in
said
deflector plates far diverting and decelerating the flow of fluid through said
upper
chamber.

7. The separator of claim 6, wherein said housing includes an upper
elongated box defining said upper chamber; and a lower elongated box defining
said lower chamber, said upper box having an open bottom, and said lower box
having an open top supporting said screen.

8. The separator of claim 7, wherein the screen includes an upper
coarse mesh screen, and a lower fine mesh screen.

8

Description

Note: Descriptions are shown in the official language in which they were submitted.



CA 02035026 2000-11-14
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This invention relates to a separator for providinD a moist, granular
blasting agent.
Specifically, the invention relates to a separator which yields a moist,
granular blasting agent from a t't~lxture of blasting agent, water and
compressed
b air for discharge through a blasting nozzle.
When treating technical-grade surf:~ces to prepare them for painting,
scrubbing building facades or removing rust, a particulate or granular agent,
e.9.
dry sand is accelerated onto the surface being treated using a high-energy
propehar~t such as air. In order to prevent dust, which can be hazardous to
healtft and to the environment In general, a liquid, (usually water) is
commonly
added to the agents. The water is conveyed along with the agent and its
propellant through a hose and discharged through a nozzle. In a conventional
process, the agent Is contact~d with the propellant by injecting th~ agent
into the
propellant. One essential requirement for proper functioning cf the system has
been that the sand or granules remain pertectly dry until arriving at the
nozzle,
and perfect dryness is expensive to achieve. When on the other hand, moist
agents such as wet sand are employed, the expense of procurement and
management are reduced and the ran~a of ~pplications is increased. This
approach, however, involves the problem of kae~ping the wet agent sufficicntiy
mobile for conveying through hoses to the nozzle. The problem is usually
solv~d
by fluidizing they sand in a tank with enough water to force it Into a
propellant
tube.
The above described approach makes it possible to convey the agent over
long distances as well as offering the advantages of much lower costs and
1


CA 02035026 2000-11-14
11/14/00 18:29 FAg 232 5831 SEABY-ASSOCIATES 1004/012
improved physiologlc~l and environmental r,~mpatibility due to the absence of
dust. There is, however, a drawback in that it takes a large quantity of water
to
adequately tTuldize the agent. This leaves undesirable water at the site of
operations which combines with the agent and with material abraded from the
surtace being treated to yield a muddy mixture, promotes the corrosion of
steel
components, prevents the surface from drying rapidly and n~cessitates further
prvressir~g.
The object of the present invention Is to mix enough water with the agent
to keep it fluid until it ~nters the propellant pipe, and to leave just enough
water in
the mixture once it has left the nozzle to prevent the agent and particles
abraded
from the surface b~ing treated turning into dust.
Accordingly, the invention relates to a separator for providing a moist,
granular blasting agent from a mixture of prope~lant, water and granular agent
comprising= a housing; a screen in sari housing dividing the interior of the
~ 5 housing Into an upper chamber and a lower chamber; a first inlet in said
housing
for Introducing the mixture into said upper chamber above said screen; at
least
one of an impact plate and a deflector in said upper chamber for decelerating
the
mixture flowing Into said upper chamber through said first inlet whereby water
is
caused to drop from the mixture through said screen into the lower chamE'er
leaving moist, granular blasting agent ; and an outlet in said housing for
discharging said moist, granular blasting agent from the housing.
The above defined object is achieved using the separator by removing
excess water at a location in the hose carrying the moist granular agent
upstream
of where the agent is discharged through the node. -This approach exploits the
2


CA 02035026 2000-11-14
11/14/00 18:30 FAg 232 5831 SEABY-ASSOCIATES ~ 005/012
fact that water or any liquid Is denser than air and will flow under the force
of
gravity through an essentially horizontal screen, which is fine enough to
retain the
agent (the sand or grant~late~ and advance it along with the propellaryt. The
method will be sucxessful only wh~n the flow of propellant and agent can be
decelerated. Otherwise, most of the liquid w111 remain entrained with the
agent
and the propellant due to high speed- An apparatus of this type must ~nsure
that
not only the excess water but also only a little of the air needed as a
propellant
can escape, and that the screen does not become clogged or that there Is same
way of cleaning the screen.
1 o The invention is desrxibed below with reference to the accompanying
drawings, wherein: .
Figure 1 is a partly sectioned, front view of one embodiment of the
invention and
Figure 2 is a partly sectioned, exploded, isometric view of another
embodiment of the Invention.
Referring to Fig. 1, one embodiment of the separator of the present
Invention includes a housing defined by a cylindrical tank 5 with an inlet 1,
which
is in fluid communication with a propellant hose 3. The hose 3 supplies a
mixture
of granular agent and excess water. A line 6 is connected to a reservoir (not
shown) for fluidized agent, which is forced into hose 3. The propellant and
drained granular agent leave the tank 5 through an outlet 2.
A screen 7 mounted in tha tank 5 beneath the inlet 1 and the outlet 2
divides the tank into an upper chamber 10 and a lower chamber 11. A deflector
13, which also acts as an impact plate for the mixture entering the upper
3


CA 02035026 2000-11-14
11/14/DO 18:30 FAg 232 5831 SEABY-ASSOCIATES ~JOD6/012
chamber, and divertera 14 extend from the screen 7 to the top wall 12 of the
tank
5. Gaps 15 ar~ provided between the ends of the deflector 13 and the Interior
surface of the side wall of the tank 5 which permit blasting agent and
propellant
to flow around the deflector. The oNter ends of the diverters 14 abut the
interior
surface of the tank side wall, but a gap 17 between their inner end$ permits
the
flow of the blasting agent and propellant past the dlverters.
A drain 19 containing a valve 16 is provided in the bottom wall i 8 of tank
5. A line 8 containing a valve iB extends into the drain 19. The drain 18 can
alternatively ba located on the side wall of the tank 8 immediately above the
bottom wall 18 without adversely affecting the operation of the apparatus.
The separator is located at any point in a hose or line carrying the mixture
of propellant and blasting agent. in operation, water, propellant and the
agent
travel through the hose 3 into the upper chamber 10 of the tank 5, where the
mixture encounters the deflectorlirrlpaCt plate 93. The deflector 13 diverts
the
mixture through the gaps 15. Since the cross-section of the tank 5 Is much
larger
than that of the hose 3, the propellant will be consld~rably decelerated and
excess liquid will drop through the screen 7. Once It has passed the gaps 15,
the
mi~dure of agent and propellant encounters another obstacle in the form
diverters
14 and exits the tank 5 through the gyp 17 and the outlet 2.
It has been found that a thin layer of granular agent forms on top of the
screen 7 and especially in tt~e front corner of the deflector 13 and in the
corners
between the divertera 14 and the interior of the tank side wall. The layer
does
not become progressively thicker and remains permeable to water. Separated
water drops to the floor of the tank and leaves the tank through the valve 16
and
4


CA 02035026 2000-11-14
11/14/00 18:31 FAg 292 5831 SEABY-ASSOCIATES ~ 009/012
the line 8 along with a small quantity of air and any particles of agent fine
enough
to penetrate the screen 7.
A cushion of air becomes established In the space between the bottom
wall 18 of the tank 5 and the saeen 7 and can be exploited to unclog the
screen
in conjunction with a safety mechanism that apparatuses of this type already
have in order to suddenly depressurize the agent supply hose, which is often
very long and accordfnDly has a large volume. When this procedure is
initiated,
the cu$hion of air in the lower chamber 11 will expand upwardly through the
screen 7, lifting the layer of agent from the screen 7 and carrying it away.
10. When fine granular agents are employed for an extended period of time,
the layer of agent on top of the screen 7 can become solid and almost
impermeable to water. To avoid clogging, the valve 16 is opened to open an
inlet
line 9 for admitting water or air under pressure. A jet of water or air will
loosen
the deposits and remove them via the hose 3 and the outlet 2 which have been
detached from the source of fluid and the nozzle, raspeckively.
Referring to Figure 2, a second embodiment of the invention includes an
elongated housing generally Indicated at 20 defined by upper and lower boxes
21
and 22, respectively. The upper box 21 defines a chamber 23 with an open
bottom end. Deflectors 25 and 26 are mounted in grooves 24 in the side walls
of
the box 21. The deflectors 25 and 2t3 are perpendicular to the direction of
flow of
fluid In the box 21. Openings 27 in the deflectors 25 and 26 permit water and
sand to flow through the deflectors. Th~ openings 27 are approximately 30 mm
in diameter, and are staggered, i.e. displaced alternately on either side of
the
central longitudinal axis of the box 21 such that they force the flow to
undergo
5


CA 02035026 2000-11-14
11/14/00 18:31 FAg 232 5831 SEABY-ASSOCIATES ~I008/012
acute deflections. The flow is thus decelerated considerably and most of the
water drops down. The lower box 22 of the housing is in the form of a trough
with a screen 28 on the top thereof, where the box 22 comes into contact with
the
upper box 21. The screen 28 includes several layers, specifically a coarse
mesh
b top layer 29, a fine mesh middle layer 30, and a supporting layer 31, which
rests
against a shoulder along the edge of the lower box 22. The upper box 21 is
secured to the lower box 22 by screws 32 mating with threaded bores 33 in the
lower box. A very wet mixture of sand aryd water enters the upper box 21 via
an
intake 34 and Is decelerated by deflectors 25 end 26. Mast of the water drops,
by grawlty, Into the lower box 22 and leaves through an outlet 35. The sand,
with
just enough water left mixed with it to make it fluid, is supplied to the
nozzle (not
shown), through a conneckor 36. The housing 20 is designed to allow the flow
to
be generated by compressed air. The air will not enter the lower box 22 of the
housing but will remain in the upper box 21 to ensure that the sand arrives at
the
nozzle. Other types of deflectors, with different types of perforations, can
be
used.
6

Representative Drawing
A single figure which represents the drawing illustrating the invention.
Administrative Status

For a clearer understanding of the status of the application/patent presented on this page, the site Disclaimer , as well as the definitions for Patent , Administrative Status , Maintenance Fee  and Payment History  should be consulted.

Administrative Status

Title Date
Forecasted Issue Date 2001-10-09
(86) PCT Filing Date 1990-06-09
(87) PCT Publication Date 1991-01-10
(85) National Entry 1991-02-22
Examination Requested 1997-06-06
(45) Issued 2001-10-09
Expired 2010-06-09

Abandonment History

There is no abandonment history.

Payment History

Fee Type Anniversary Year Due Date Amount Paid Paid Date
Application Fee $0.00 1991-02-22
Maintenance Fee - Application - New Act 2 1992-06-09 $50.00 1992-05-29
Maintenance Fee - Application - New Act 3 1993-06-09 $50.00 1993-06-04
Maintenance Fee - Application - New Act 4 1994-06-09 $50.00 1994-05-12
Maintenance Fee - Application - New Act 5 1995-06-09 $75.00 1995-05-17
Maintenance Fee - Application - New Act 6 1996-06-10 $75.00 1996-05-28
Request for Examination $200.00 1997-06-06
Maintenance Fee - Application - New Act 7 1997-06-09 $75.00 1997-06-06
Maintenance Fee - Application - New Act 8 1998-06-09 $75.00 1998-06-08
Maintenance Fee - Application - New Act 9 1999-06-09 $75.00 1999-06-08
Maintenance Fee - Application - New Act 10 2000-06-09 $100.00 2000-06-05
Maintenance Fee - Application - New Act 11 2001-06-11 $100.00 2001-05-25
Final Fee $150.00 2001-06-20
Maintenance Fee - Patent - New Act 12 2002-06-10 $100.00 2002-05-22
Maintenance Fee - Patent - New Act 13 2003-06-09 $100.00 2003-04-14
Maintenance Fee - Patent - New Act 14 2004-06-09 $125.00 2004-05-25
Maintenance Fee - Patent - New Act 15 2005-06-09 $225.00 2005-05-10
Maintenance Fee - Patent - New Act 16 2006-06-09 $225.00 2006-05-17
Maintenance Fee - Patent - New Act 17 2007-06-11 $225.00 2007-05-14
Maintenance Fee - Patent - New Act 18 2008-06-09 $225.00 2008-06-04
Maintenance Fee - Patent - New Act 19 2009-06-09 $225.00 2009-05-21
Owners on Record

Note: Records showing the ownership history in alphabetical order.

Current Owners on Record
KEIZERS, SIGRID
Past Owners on Record
None
Past Owners that do not appear in the "Owners on Record" listing will appear in other documentation within the application.
Documents

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Document
Description 
Date
(yyyy-mm-dd) 
Number of pages   Size of Image (KB) 
Cover Page 2001-09-27 1 48
Cover Page 1994-05-14 1 17
Abstract 1994-05-14 1 76
Claims 1994-05-14 2 66
Description 1994-05-14 8 290
Drawings 1994-05-14 2 56
Claims 2000-06-02 1 54
Claims 2000-11-14 2 57
Drawings 2000-11-14 2 60
Description 2000-11-14 6 225
Representative Drawing 2001-09-27 1 14
Representative Drawing 1999-02-01 1 8
Fees 2000-06-05 2 69
Fees 2001-05-25 1 37
Assignment 1991-02-22 3 126
Prosecution-Amendment 1997-06-06 1 44
Correspondence 1997-04-23 4 112
Fees 2006-05-17 1 24
Fees 2003-04-14 1 24
Prosecution-Amendment 1999-12-10 2 4
Fees 1999-06-08 1 116
Fees 2002-05-22 1 27
Prosecution-Amendment 2000-06-02 3 122
Prosecution-Amendment 2000-07-14 1 25
Prosecution-Amendment 2000-11-14 12 396
Correspondence 2001-06-20 2 46
PCT 1991-02-22 10 353
Fees 1997-06-06 1 42
Fees 1998-06-08 1 42
Fees 2004-05-25 1 28
Fees 2005-05-10 1 24
Fees 2007-05-14 1 26
Fees 2008-06-04 1 37
Fees 2009-05-21 1 38
Fees 1996-05-28 1 34
Fees 1995-05-17 1 34
Fees 1994-05-12 1 31
Fees 1993-06-04 1 22
Fees 1992-05-29 1 21