U.S. patent number 3,758,036 [Application Number 05/100,869] was granted by the patent office on 1973-09-11 for spraying apparatus.
This patent grant is currently assigned to Heimo Geratebau Gesellschaft mit beschrankter Haftung. Invention is credited to Herbert Bauder, Otto Locher.
United States Patent |
3,758,036 |
Bauder , et al. |
September 11, 1973 |
SPRAYING APPARATUS
Abstract
A spraying apparatus especially an apparatus portable on the
back of a person, with a motor driven blower connected to a
delivery pipe and with an active agent receiving tank connected to
said delivery pipe, in which an oscillating burner resonator has
its cooling means for purposes of generating a mist detachably
connected to the blower, said cooling means including a cover
surrounding said oscillating burner resonator.
Inventors: |
Bauder; Herbert
(Grossholzleute, DT), Locher; Otto (Isny/Allgau,
DT) |
Assignee: |
Heimo Geratebau Gesellschaft mit
beschrankter Haftung (Isnyl/Allgau, DT)
|
Family
ID: |
5754985 |
Appl.
No.: |
05/100,869 |
Filed: |
December 23, 1970 |
Foreign Application Priority Data
|
|
|
|
|
Dec 24, 1969 [DT] |
|
|
P 19 64 907.1 |
|
Current U.S.
Class: |
239/102.1;
239/135; 239/154 |
Current CPC
Class: |
A01M
13/00 (20130101); F41H 9/06 (20130101); F02B
63/02 (20130101); B05B 17/06 (20130101); F02B
2075/027 (20130101) |
Current International
Class: |
A01M
13/00 (20060101); B05B 17/04 (20060101); B05B
17/06 (20060101); F41H 9/06 (20060101); F41H
9/00 (20060101); F02B 63/02 (20060101); F02B
63/00 (20060101); F02B 75/02 (20060101); B05b
003/14 () |
Field of
Search: |
;239/101,102,152,153,154,135 |
References Cited
[Referenced By]
U.S. Patent Documents
Primary Examiner: King; Lloyd L.
Claims
What we claim is:
1. A spraying apparatus, which includes a delivery pipe, a motor
driven blower connected to said delivery pipe, an active agent
receiving tank connected to said delivery pipe and an oscillating
burner resonator having cooling means and being exchangeably
connected to said blower for generating mist, carburetor means
associated with said oscillating burner resonator and exchangeably
connected to the blower, and comprising a whirling chamber and
starter air pipe means leading to said whirling chamber, said
starter air pipe means projecting as a pressure pipe into the
cooling air current for the oscillating burner resonator, said
carburetor means also comprising a mixture neck, the axes of said
starter air pipe means and of said mixing neck and of said burner
resonator lying parallel to one another in a plane.
2. An apparatus according to claim 1, in which the carburetor means
of said resonator forms one single cast piece with a valve chamber
of said carburetor, said valve chamber being axially parallel to
said mixing neck.
3. An apparatus according to claim 1, in which said carburetor
means has a flange and includes a twisting member located entirely
within the mixing neck of the carburetor in spaced relationship to
a fuel nozzle of said carburetor and fixed to said carburetor
flange.
4. An apparatus according to claim 1, in which the carburetor means
of said resonator has a fuel nozzle arranged transverse to the
carburetor flow direction in the middle region of said whirling
chamber, and which includes a fuel tank and a return pressure pipe
leading from the carburetor to the fuel tank, said pressure pipe
being approximately axially parallel to the mixing neck of the
carburetor, all pipes of said burner resonator being connected to
the same side of the carburetor.
5. An apparatus according to claim 1, which includes a cooling
jacket surrounding said resonator, and in which said carburetor
means is provided on the upper side of said cooling jacket.
6. An apparatus according to claim 1, in which the carburetor means
of said resonator has a cubicle outer shape.
7. An apparatus according to claim 1, which includes an adjusting
device responsive to blower pressure and arranged in the fuel
supply to said resonator.
8. An apparatus according to claim 7, in which said adjusting
device is formed by a diaphragm controlled relief valve on said
fuel whirling chamber.
9. An apparatus according to claim 8, in which the valve has a
valve closing part forming with the diaphragm a diaphragm pressure
chamber, and a cover cap having air evacuation openings and being
located on that side of the diaphragm which faces away from the
axis of the carburetor.
10. An apparatus according to claim 1, which includes an adjusting
device responsive to blower pressure and arranged in the fuel
supply to said resonator, said adjusting device being connected to
a section of said starting air pipe means.
11. An apparatus according to claim 7, in which the adjusting
device is adjustable in conformity with its release pressure.
12. An apparatus according to claim 1, which includes pipe means
for conveying an active agent, and in which at least a part of said
pipe means is connectable to said blower.
13. An apparatus according to claim 12, which includes a three-way
valve having an inlet connection and an outlet connection, said
inlet connection being connected to said blower, and said outlet
connection being connected to said pipe means for conveying an
active agent.
14. An apparatus according to claim 5, which includes pipe means
for conveying an active agent, and in which said pipe means is
connected to said cooling jacket, a manually operable three-way
valve having inlet and outlet connections being directly located to
the cooling jacket.
15. An apparatus according to claim 14, in which the inlet
connection of said three-way valve has a pressure plate associated
therewith, and which includes a resonator pressure responsive valve
closed in response to said resonator being pressureless, said
resonator pressure responsive valve being located in the pipe means
for conveying an active agent.
16. An apparatus according to claim 1, in which said resonator has
the shape of a rod.
17. An apparatus according to claim 1, which includes a break-off
coupling, and in which said resonator is detachably connected to
said spraying apparatus by at least one break-off coupling, said
spraying apparatus also including a cooling jacket surrounding said
resonator and furthermore includes a plug coupling, said cooling
jacket being connected through said plug coupling to said
blower.
18. An apparatus according to claim 12, in which the pipe means for
conveying an active agent leads from the active agent receiving
tank to said resonator and in which a break-off coupling is
provided associated with said active agent conveying pipe means,
safety valve means being associated with said break-off coupling
and being adapted to close in response to a disengagement of said
coupling.
19. An apparatus according to claim 1, which includes electric
starting means for said resonator, said electric starting means
being detachably connected to said resonator.
20. An apparatus according to claim 4, which includes a cooling
jacket surrounding said resonator and in which the fuel tank forms
a structural unit with at least a portion of said fuel tank, which
portion is detachably connected to said resonator, said cooling
jacket having a portion connected to said fuel tank.
Description
This invention relates to spraying apparatus, particularly spraying
apparatus which can be transported on a person's back, having a
motor driven blower connected to a delivery pipe, and a container
for an active agent also connected to the delivery pipe.
The invention is based on the problem of constructing a spraying
apparatus of this kind such that, in use, the blast air current for
the blower is in an advantageous manner also suitable for the
production of a mist.
This is attained in a spraying apparatus of the aforementioned kind
according to the invention in that for the production of the mist
there is provided an oscillating burner resonator and cooling
apparatus therefor exchangeably connected to the blower. Thereby,
in use, a very effective cooling of the apparatus is obtained so
that the apparatus has a high degree of efficiency, and can be
carried during use without danger.
In one embodiment, which is easy to handle, the cooling apparatus
is formed by a cover which surrounds the oscillating burner
resonator, and which is preferably axially parallel to such
resonator, so that the resonator is cooled almost uniformly over
its whole periphery and the apparatus can be held at any place. The
cover extends suitably at least approximately as far as a
connection for entry of the active agent into an oscillating tube
of the resonator whereby complete protection of the oscillating
burner resonator is attained.
In order to ensure small dimensions of mist producing auxiliary
apparatus and easy handling while maintaining a substantial cooling
action, the cover in the area of a combustion chamber of the
oscillating burner resonator is preferably widened and the front
and/or rear portion of the cover which merges into such widened
portion of the cover is of conical or like form, so that favorable
flow properties result.
The air blast from the blower in the spraying apparatus may also be
used advantageously for the production of mist and for the delivery
of mist, by exchangeably connecting a supply air nozzle of the
oscillating burner resonator to the blower, the supply air nozzle
being directed suitably to the oscillating tube of the resonator,
and lying in its area. Thereby supply air emerging from the nozzle
carries along mist produced in the oscillating burner resonator so
that a very large range of mist delivery can be obtained.
Preferably the supply air nozzle is arranged axially parallel to
and around the oscillating tube, so that the supply air current
forms an air covering surrounding the mist current so as to cause
the mist current to be bunched together so that it can penetrate
the atmosphere more easily and thus can be delivered over a greater
distance.
The supply air nozzle is suitably formed by the front end of a
cover and preferably this cover is provided by the cooling cover so
that a separate air nozzle and a separate supply air connection are
not necessary and an extremely simple arrangement can be
obtained.
For obtaining optimum bunching together of the mist current the
nozzle or the cover is cylindrical.
In a further embodiment of the invention, the oscillating tube
terminates in front of the supply air nozzle and has an end section
which is widened so that a twist-free, cooled, oscillating air
current from the resonator is widened in cross-section, and upon
leaving this widened section is stabilized. In addition, with this
arrangement, directly after the combustion chamber of the burner, a
low pressure zone is provided whereby the cross-section of the
active agent mist current is widened, so that a loosened mist field
results and bunching together of the mist droplets is prevented.
Thus optimum use of the active agent which may be expensive is
ensured. This is in particular the case when the widened section of
the oscillating tube is of a form having parallel surface lines,
for example, a cylindrical form. The widened section of the
oscillating tube preferably merges with the remainder of the tube
via a section of conical or like form in front of the supply air
nozzle to give favorable flow conditions.
Preferably entry of the active agent into the oscillating tube
occurs at a position behind the widened oscillating tube section
and in front of the end of the supply air nozzle, preferably
approximately centrally between these.
In order to improve operation of the oscillating burner resonator,
the oscillating burner resonator may have a carburetor which is
provided with an air pipe, leading into a fuel whirling chamber
which is connected to the blower. With this arrangement there is no
need for a pumpp for the operation of the oscillating burner
resonator, which may be complicated and liable to failure, since
fuel supply pressure for starting the burner is produced by the
blower. In a particularly suitable arrangement the air pipe extends
into the cooling air current, preferably between the cooling cover
and the blower side of the heat protection cover, so that the
kinetic and static energy of the blower can be utilized to produce
compressed air to start the resonator. In addition, to accomodate
the air pipe, in a space saving manner, the axes of the air pipe, a
mixing neck of the carburetor and the resonator may lie in a plane
preferably a perpendicular plane.
The carburetor may have an integral carburetor valve chamber, in
particular formed as a casting to give a simple construction.
Preferably the valve chamber of the carburetor is axially parallel
to its mixing neck, to the carburetor, and also to the oscillating
burner resonator whereby a simple construction is obtained giving
rise to a saving of pipes and inexpensive manufacture.
A twisting member lying solely in the mixing neck may be provided,
in particular at a distance from a fuel nozzle and preferably fixed
to a flange of the carburetor. Thereby, such member can be kept
short in its constructional length while being effective in the
mixture preparation zone of the carburetor.
The fuel nozzle of the carburetor is suitably provided cross-wise
to the direction of flow, preferably in the region of the middle of
the fuel whirling chamber, to give a very satisfactory preparation
of the fuel mixture.
In order to prevent an accumulation of excess fuel in the
carburetor in a structurally simple manner, a combined return
pressure pipe from the fuel whirling chamber to the fuel tank may
be provided approximately axially parallel to the mixing neck of
the carburetor.
All pipes of the carburetor may be connected to the same side of
the carburetor, preferably in a protected position on the rear
side, in an easily visible manner as well as in a spatially close
arrangement. For the accommodation of the carburetor in a space
saving manner, such pipes may be provided on the upper side of the
oscillator burner resonator and of the cooling cover surrounding
this, whereby the carburetor is also easily accessible, for
example, for the purpose of starting the oscillating burner
resonator. It is particularly advantageous if the carburetor has a
cubic outer shape, whereby additional parts or units can be
advantageously mounted on the carburetor.
In order to prevent overheating of the resonator in the event of
failure of the blower, an adjusting device may be provided on the
fuel supply to the oscillating burner resonator, preferably on the
carburetor, which can be controlled independently of the blower
pressure so that in the event that blower pressure falls, the fuel
supply is immediately interrupted and thereby the resonator is
stopped. The adjusting device is formed suitably by means of a
discharge valve, preferably diaphragm controlled, on the fuel
whirling chamber whereby a very rapid shutting off of the fuel
supply to the resonator is ensured. The valve closing member may be
disposed in a simple manner in a cover of the carburetor housing,
which cover forms with the diaphragm, a pressure chamber, and on
the side of the diaphragm facing away from the carburetor, there is
provided a cover cap provided with discharge openings as a
protection.
Preferably, the active agent pipe is connectable to the blower so
that the active agent pipe can be completely cleaned in a simple
manner with compressed air. In order to be able to effect such
connection simply and selectively when required, the active agent
pipe may be connected to an outlet connection of a valve,
preferably a three-way valve, an inlet connection of which is
connected by means of a pipe to the blower. The three-way valve
may, in a simple manner, be provided as an intermediate piece
between the ends of the active agent pipe, whereby by suitable
operation of the valve, compressed air from the blower can be fed
at the same time, or separately, to both sections of the active
agent pipe. In a particularly simple embodiment the active agent
pipe is connectable to the cooling apparatus of the oscillating
burner resonator, and the valve is fixed directly on the cooling
cover, whereby a separate blower supply pipe to the valve is not
necessary. In order to achieve a comparatively large air presssure
in the active agent pipe, the inlet connection of the valve may be
associated with a pressure member, preferably a pressure plate.
In order to enable the active agent supply to be adjusted at any
time as required, a manually operable valve may be provided in the
active agent pipe, which in a simple manner may be provided by the
aforesaid three-way valve.
In order to prevent the active agent fromm flowing unobstructed
into the oscillating pipe, where it may possibly become ignited
when the burner is stopped, a control valve may be provided in the
active agent pipe, preferably in the region of the connection of
the active agent pipe to the oscillating burner resonator, which
valve is operable by resonator pressure so that with low pressure
in the oscillating burner resonator the valve closes and
immediately adjusts the active agent supply, whereby if the valve
is provided directly adjacent to the region of connection of the
active agent pipe, it is attained that after the closing of the
valve, no or very little active agent flows into the oscillating
pipe. In a simple embodiment, the control member of the valve is
formed by a diaphragm, which is connected on its pressure side by
means of a pipe to the combustion chamber of the oscillating burner
resonator, so as to respond immediately to a change in combustion
chamber pressure. So that the valve may have two operating
positions, namely a completely open and a completely closed
position, without intermediate positions, the valve has a closing
part which is urged to a position at which the valve is closed, and
a spring loaded stop member is provided which, when the valve is in
the open position, contacts a stop of the closing part of the valve
and is movable preferably cross-wise to this, so that by releasing
the stop member, the valve closing part is moved abruptly into its
closed position, but when the combustion chamber is under pressure
completely free passage for the active agent is ensured.
For facilitating handling of the spraying apparatus the oscillating
burner resonator is in the form of a rod so that it can be
conveniently held and can be directed as desired by manual
engagement of the cooling cover.
Loosening of the mist producing additional apparatus which may be
necessary, for example, when using on uneven terrain, may be
achieved by connecting the oscillating burner resonator tube by
means of at least one tear-off coupling or the like to the spraying
apparatus so that by application only of a traction force or by
similar simple handling, separation of the oscillating burner
resonator from the spraying apparatus can be attained. In a simple
construction the cooling apparatus of the oscillating burner
resonator is connected by means of a plug coupling which has
preferably a resilient suspension clip or the like, to the blower
pressure connection piece formed in particular by means of a
flexible hose, so that the cooling apparatus is held only by
frictional connection to the blower connection piece. If the active
agent container is disposed fixed to the apparatus, then it may be
necessary for the active agent pipe which leads from the active
agent container to the active agent inlet in the oscillating burner
resonator, to be provided with a tear-off coupling, which
preferably on the container side has a safety valve which closes
when the coupling is released, so that immediately after release of
the tear-off coupling, further discharge of active agent from the
active agent container is prevented. In a simple construction the
tear-off coupling of the active agent pipe is fixed directly on the
active agent container, preferably with a plug connection, so that
it is capable of being dismantled for the purpose of easy
maintenance without tools.
The combustion chamber of the oscillating burner resonator may be
surrounded by a heat protection means formed preferably by a cover.
Thereby the whole heat of the combustion chamber of the oscillating
burner resonator may be radiated onto the heat protection cover
from where the heat is dissipated convectively by the cooling air.
The protection cover ensures that the combustion chamber has a
constant temperature, preferably between 800.degree. and
1000.degree. C, so that uniform running behavior of the combustion
chamber is ensured. Furthermore, with this arrangement the
temperature of the cooling cover or cooling tube is kept low so
that the rod-like burner resonator may also be held in this area by
hand, without additional heat protection being necessary. The heat
protection cover may be conical or of a similarly tapered form
suitably at the blower side end, and is preferably closed, so that
with favorable blow conditions complete protection of the
combustion chamber in respect of the blast air current is ensured.
On the front end the heat protection cover may be open so that a
small release of air is ensured.
The oscillating burner resonator may have an ignition device which
is connectable to the electric circuit, in particular the ignition
circuit, of the blower motor, so that a separate unit for the
ignition current of the oscillator burner resonator is not
necessary. Instead of this or additionally however, it is also
feasible to dispose in an easily detachable manner on the
oscillating burner resonator, preferably below the combustion
chamber, an electric starting device for the oscillating burner
resonator, which, for example, may comprise an ignition coil and
dry batteries.
A further constructional simplification of the apparatus is
attained by providing a fuel tank for the oscillating burner
resonator which forms a constructional part at least with one part
of the cooling apparatus, and which is preferably disposed in an
easily detachable manner on the oscillating burner resonator.
Suitably a section, preferably the rear transition section of the
widened part of thee oscillating burner resonator is connected to
the fuel tank and passes therethrough. This construction also
facilitates favorable arrangement of a filling connection for the
fuel tank.
One embodiment of the invention will now be described by way of
example only with reference to the accompanying drawings which are
approximately true to scale and in which:
FIG. 1 is an axial sectional view of one form of spraying apparatus
according to the invention;
FIG. 2 is a sectional view of the spraying apparatus of FIG. 1 on
an enlarged scale;
FIG. 3 is a vertical sectional view of the carburetor of the
apparatus of FIGS. 1 and 2,
FIG. 4 is a horizontal sectional view of the carburetor of FIG.
3;
FIGS. 5 and 6 are partially sectional views of the apparatus of
FIG. 1 on an enlarged scale;
FIG. 7 is a cross-sectional view of the active agent inlet of the
apparatus of FIG. 1; and
FIG. 8 is a sectional view of a detail of the apparatus of FIG. 1
enlarged.
As shown in FIGS. 1 and 2, the spraying apparatus has a
multi-blower unit 1, which is formed by a combustion engine 2
connected to a radial blower 3, which has a downwardly projecting
connection piece 4 for connection to a blower pressure connection
piece 5.
To the blower pressure connection piece 5 there is connected a
cooling apparatus 7, for an oscillating burner resonator 6. The
cooling apparatus is formed by a tube-like cover 7, in which a
combustion chamber 8 and an oscillating tube 9 of the oscillating
burner resonator are disposed. In the region of the combustion
chamber 8, the cooling cover 7 has a cylindrical section 10, of
enlarged diameter, which merges via conical end sections 11 and 12
into connecting sections of the cooling cover 7. A front section 13
of the cooling cover 7 is disposed coaxially around the oscillating
pipe 9, and is open at its front end 14, so as to define an annular
air nozzle 14 directed in the axial direction of the pipe 9.
Directly in front of this nozzle 14 an active agent inlet
connection piece 15 which is connected with an active agent pipe 16
to an active agent tank 17, leads into the tube 9. The active agent
tank is fixed on the upper side of the blower 3. The pipe 9 is of
constant cross-section over its whole length except in front of the
active agent inlet connection piece 15 where it has a widened
section 17, the inner dimension of which is about the same as that
of the front section 13 of the cooling cover 7, and which merges
with the remainder of the pipe 9 via a conical transition section
18.
Above the combustion chamber 8 of the oscillating burner 6, there
is provided a carburetor 19 outside the cooling cover 7, which
carburetor 19 is connected via a suction pipe 20 to the rear end of
the burner 8.
Fuel air mixture is delivered from the carburetor 19 through the
suction pipe 20 into the combustion chamber 8 and is ignited in the
combustion chamber with means, not shown, giving rise to frequent
explosions or detonations in the combustion chamber 8, which
produce in the oscillating pipe 9 gas column oscillations which are
superimposed on pressure waves the amplitudes of which are
determined mainly by the geometrical structure of the oscillating
tube. Thereby successive high pressure and low pressure zones are
produced in the tubes 8 and 9, the maximum and minimum value of the
pressure differing quite considerably from atmospheric pressure.
Gases flow forward in the oscillation tube 9 in the direction of
the arrow 21, and liquid active agent is introduced through the
connection piece 15 into such flow, such active agent being
immediately broken up into fine droplets by the oscillating gas
column, being partially evaporated in consequence of the gas
temperature, and together with the exhaust gas being expelled as
mist from the end 22 of the oscillating tube 9. At the same time,
operation of the blower 3 causes the combustion chamber 8 and the
oscillating tube 9 to be cooled by an air current surrounding
these, which air current emerges heated from the nozzle 14. The
heated air current emerging from the nozzle 14 is widened to give
an air current covering on the widened end section 17, and is
stabilized upon leaving the end edge 22 of the tube 9, so as to
provide an air covering surrounding the mist current emerging from
the tube 9 which prevents such mist current immediately upon
leaving the oscillating tube 9, from widening substantially in
cross-section. Such mist current protected by the air covering can
be driven into the atmosphere over a large distance until the
effect of the air cover reduces sufficiently to enable the mist
current to widen out. As the mist current passes from the
oscillating tube 9 into the widened end section 17, the mist
current cross-section increases so that individual mist droplets
are not caused to be bunched together, so as to give an extremely
fine distribution of mist droplets.
As is also shown in FIGS. 1 and 2, the combustion chamber 8, which
in its rear region has a cylindrical, and in its front region a
conical section, is provided with a heat protection cover 23 which
is located around the chamber 8 and inside the cooling cover 7. The
radial distance of the cover 23 from the periphery of the
combustion chamber 8 is about the same over its whole extension.
The rear end 24 of the heat protection covering 23 lying behind the
rear end of the combustion chamber 8 is in the form of a closed
conical section while the front end 25 is open. The distance of the
heat protection cover 23 from the widened section 10 of the cooling
cover 7 is selected so large as to give a sufficient annular space
for passage of blower air. By means of the heat protection cover 23
the temperature of the burner 8 can be kept constant, and
furthermore, insulates the burner from the cooling cover 7 so that
this cover 7 can be gripped by hand in the region of the widened
section 10. The suction tube 20 which passes radially through the
cooling cover 7 and the heat protection cover 23, at the rear end
of the burner 8, firmly holds the tubes 8, 9 as well as the heat
protection cover 23, axially in respect of the cooling cover 7, so
that the former upon heating may expand unobstructed forwards in
the direction of the arrow 21.
Between the rear end 24 of the heat protection cover 23 and the
surrounding rear section 11 of the cooling cover 7, there is formed
an annular channel which tapers in cross section forward in the
direction of the arrow 21. In such channel, pointing to the rear,
there is disposed the end of a starting air pipe 26, which pipe is
guided on the cooling cover 7 to the rear 27 of the carburetor 19.
With this arrangement, during operation of the blower 3, in a
manner still to be described, air is forced into the carburetor
19.
The rear transition section 11 of the widened part 10 of the
cooling cover 7 is formed as an independent constructional part,
fixed detachably with screws 28, which forms a constructional unit
with a fuel tank 29 for the oscillating burner resonator 6. In the
embodiment illustrated the section 11 passes through the fuel tank
29 so that a filling connection piece 30 of the tank lies above the
transition section 11, and the main part of the tank 29 is located
below the transition section 11. To the rear 27 of the carburetor
19, a combined return pressure pipe 31 is connected, which is
guided from the carburetor 19 to the rear to the upper part of the
fuel tank 29, so that excess fuel can be returned continuously from
the carburetor 19 to the tank 29.
A housing 32 is fixed under the cover 7 to the front side of the
fuel tank 29, in an easily detachable manner (not shown), such
housing 32 supporting an ignition coil 33 and dry batteries 34, for
ignition of fuel mixture in the combustion chamber 8.
As shown in FIGS. 2 and 3, the return pressure pipe 31, the suction
tube 20, and the starting air pipe 26 run substantially axially
parallel to one another from the rear 27 of the carburetor 19, and
their middle axes lie with the middle axis of the oscillating
burner resonator 6 in a common vertical plane. The suction tube 20
is connected to the carburetor 19 between the starting air pipe 26,
which lies above it, and the return pressure pipe 31, and the
return pressure pipe 31 passes axially parallel to the oscillating
burner resonator 6, directly above the cooling cover 7 as far as
the fuel tank 29.
The carburetor 19 has a substantially cubic housing 35 which is
cast in one piece with a valve chamber 36. The valve chamber 36 is
substantially cylindrical, passes through the housing 35 and is
surrounded by a fuel whirling chamber 37 formed in the housing 35
which is connected to the valve chamber 36 via at least one fuel
nozzle 38 lying in the region of the middle of its length. The axis
of the fuel nozzle 38 lies horizontally and at right angles to thee
axis of the carburetor which is identical with the axis of the
valve chamber 36.
At the rear 27 of the carburetor 19 and end 39 of the suction tube
20 which defines a mixing neck is introduced into the valve chamber
36 so that this mixing neck 39 lies on the axis of the carburetor
and the valve chamber 36. The mixing neck 39 is clamped against the
carburetor 35 by an annular disc-like flange 40, and is thereby
axially secured. Inside the mixing neck 39 there is located a
twisting member 41 which is fixed to the front end of the mixing
neck 39 lying in the valve chamber 36, by means of holders 42' on
its front end. The member 41 freely projects from the front end to
the rear in the mixing neck 39. The whole twisting body 41 is
located at a distance behind the fuel nozzle 38 so that in the area
of the air and fuel intake there is produced a free tubular
cross-section, and the twisting body 41 only acts in the mixture
preparation zone, that is, the mixing which takes place with the
smallest possible drop in pressure. A starter switch 42 is mounted
on the upper side of the cubic carburetor housing 35.
To start the oscillating burner resonator the blower 3 is set in
operation so that the fuel whirling chamber 37 is pressurized via
the starting air pipe 26, and fuel is supplied to the fuel whirling
chamber 37 from the tank 29 through the nozzle 38, and the tube 20
to the burner 8. On operation of the starting switch 42, the fuel
air mixture in the burner 8 is ignited. During subsequent operation
air is drawn into the valve chamber 36 through a suction valve 43
provided on the front side of the carburetor 19 and is mixed with
fuel from the nozzle 38. Subsequently, in the area of the twisting
member 41, a mixing preparation takes place to give a prepared
mixture corresponding to the working frequency of the burner 8.
As shown in FIG. 4, one side wall of the carburetor 19 is formed by
a lid 44, which carries an adjusting device 45 for the oscillating
burner resonator 6. This device comprises an air evacuating valve
46, associated with the fuel whirling chamber 37, which has a valve
closing part 47 which is movably mounted in the lid 44 at right
angles to the axis of the carburetor, and which is tensioned by a
spring 48 in the direction of the axis of the carburetor. The valve
closing part 47 is provided with a blind end bore leading to the
outside of the lid 44 and has cross-bores 47a leading into this
blind bore which in the end position of the valve closing part 47,
directed towards the axis of the carburetor, communicates with the
fuel whirling chamber 37, and in the other end position, to the
slide bore of the lid 44 in which the valve closing part 47 is
movable, they are closed. A diaphragm 49 is sealed at its edges to
the outside of the lid 44, the middle area of the diaphragm 49
being connected to the valve closing part 47. A pressure space 50
is enclosed by the lid 44 and the diaphragm 49 and communicates
with a control pressure pipe 51 which is provided as a by-pass from
the starting air pipe 26, so that the space 50 is kept under
pressure by the blower 3. Due to this pressure the diaphragm is
raised from the lid 44 to the position shown on the right in FIG.
4, so that the bores 47a of the valve closing part 47 are closed.
If, on the other hand, due to defects in the blower 3 the blower
pressure drops, then the space 50 becomes depressurized, so that
the valve closing part 47 is moved by the spring 48 into the
position shown on the left in FIG. 4, and the fuel mixture is led
through the bores 47a and the blind hole bore from the fuel
whirling chamber 37, so that an immediate stopping of the burner 8
is effected. On the outside of the lid 44 a cover cap 52 is fixed,
which is provided with air evacuation bores 53. On the opposite
side of the carburetor a similar cap-like lid 53 is provided.
As shown in FIG. 5, the blower pressure connection piece 5 is
formed as a flexible hose which is pushed onto the outlet
connection piece 4 of the blower, and is firmly clamped in place
with a screw clamp 54. The cylindrical end connection piece 35 of
the cooling cover 7 which connects with the conical transition
section 11 is pushed into the other end of the flexible hose 5 and
is fixed with a tear-off coupling 56 so that it can be separated
from the hose 5 by a predetermined tractive stress. The break-off
coupling 56 has a clip-like clamping band 57 which presses the hose
5 against the periphery of the closure connection piece 55, the
ends of the clamping band 57 being connected to one another by
means of a traction spring 58, the spring strength of which
determines the braking force of the coupling 56.
So that separation of the cooling cover 7 and thereby the
oscillating burner resonator 6 from the spray apparatus will ensure
also separation of the active agent pipe 16, there is also
detachably inserted in the outlet connection piece 59 of the active
agent tank 17 a break-off coupling 60. The break-off coupling 60
has on the tank side end a collar sleeve 61 which can be inserted
and frictionally locked in the connection piece 59, and can be
mounted and dismantled without a tool. A sleeve 62 is provided on
the inner end of the sleeve 61. On the outer end section 63 of the
sleeve 61, which is of reduced diameter, a valve housing 64 is
placed which clamps a guide plate 65 against the front-side of the
end-section 63. On the free end of the valve housing 64, there is
provided a plug opening 66, which tapers conically inwards, in
which the corresponding protected end 67 of the active agent pipe
16 can be inserted and frictionally locked, so that the end 67 can
be separated from the housing 64 by a predetermined traction force
on the pipe 16. A valve closing part 68 with a shaft is guided
movably in the plate 65 and this conical valve closing part 68 is
spring-loaded in a direction towards the opening 66 by means of a
helical coil spring. The inner end of the opening 66 provides a
valve seating for the valve closing part 64. If the hose, as shown
on the right of FIG. 6, is inserted into the vlave housing 64, then
the valve closing part 68 is pressed back against the force of the
spring so that the valve is opened, and the active agent can flow
from the tank 17 into the pipe 16. As soon as the hose 16, as shown
on the left in FIG. 6, is withdrawn from the opening 66, the valve
closing part 68 moves against its seating, whereby further flow of
active agent from the tank 17 is prevented.
Directly above the active agent inlet connection-piece 16, there is
provided a shut-off valve 69 (FIG. 7), in the path of the active
agent. This valve 59 is, viewed from above, screwed onto the active
agent inlet connection piece 15, and has a valve pin 70, axially
parallel to this, which is spring-loaded downward against a valve
seating by a spring 71. Above the valve seating there is provided
on the pin 70 a stop collar 72, which is associated with a catch
bolt 73 disposed movably at right angles thereto. This catch bolt
73 is spring-loaded away from the valve pin 70 by a screw-pressure
spring 74 and is fixed on a diaphragm 76 of a pressure valve 75.
The valve 75 has a chamber 77 facing away from the pin 70 which is
connected via a pipe (not shown) to the combustion chamber 8, and
the oscillating tube 9. Due to the combustion chamber pressure
prevailing in the chamber 77, the catch bolt 73 is held against the
force of the spring 74 in the position indicated on the right in
FIG. 7, at which it contacts the stop-collar 72 so that the valve
pin 70 is located in its open position at which active agent can
flow through connection 78 into the connection piece 15. As soon as
the pressure in the chamber 77 drops below a predetermined value,
for example, due to a defect of the oscillating burner resonator 6,
the catch bolt 73 is drawn back by the spring 74, from the
stop-collar 72, so that the pin 70 under the force of the spring
71, as shown on the left in FIG. 7, is moved into its closed
position, and further flow of active agent to the connection piece
15 is prevented. The pin 70 projects upward from the valve 69, so
as to provide a handle 79 with which the valve may again be
opened.
In the active agent pipe 16 there is provided, as shown in FIG. 8,
a three-way valve 80, having two axially aligned outlet connection
pieces 81, 82 connected respectively to a section 16a of the active
agent pipe leading to the active agent tank 17, and to a section
16b of the active agent pipe leading to the connection piece 15.
The valve 80 has a housing 83 which is fixed with a flange to the
outside of the cooling cover 7, for example, on its upper side, and
an inlet connection piece 84 of the valve 80 is directly connected
to the cooling cover 7. In the area of the inlet opening 84, there
is provided in the cooling cover 7, a pressure plate 85 inclined
obliquely in the direction of the cooling air flow, by means of
which a part of the cooling air current can be diverted into the
three-way valve 80. The valve has a control part 86, which is
operated by a handle 87, and in the position of this part according
to FIG. 8, air is directed through the valve inlet 84 into the
section 16b of the active agent pipe leading to the active agent
inlet connection piece 15, so that this is cleaned to remove, for
example, deposited, and possibly dry effective agent particles,
with, if necessary, hot air without using additions in the cleaning
air which may or further soil the active agent pipe. If the handle
87 is pivoted to the left from the position shown in FIG. 8, then
the two active agent pipe sections 16a, 16b are connected to one
another to allow passage of the active agent. If on the other hand
the handle 87 is pivoted to the right from the position according
to FIG. 8, then the section 16b of the active agent pipe is
connected to the cooling air cover 7, so that both sections can be
cleaned with blower air.
It is, of course, to be understood that the present invention is,
by no means, limited to the specific showing in the drawings, but
also comprises any modifications within the scope of the appended
claims.
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