Note : Les descriptions sont présentées dans la langue officielle dans laquelle elles ont été soumises.
SUMMARY OF THE INVENTION:
The invention relates to a gas cleaning and heat trans-
-fer apparatus operable to separate foreign matter from a
gas, such as air, and transfer heat from the gas to a liquid.
The apparatus has a plurality of gas cleaning units that
are useable with a hood assembly in a cooking environment
; for separating water, smoke, grease, and particulates and
like foreign matter formed in the cooking operation from the
hot gas and removing heat from the hot gas. The heat is
transferred to a liquid, as water, for subsequent utilization,
such as space heating or water heating. Each gas cleaning
unit has a heat conducting cylindrical wall surrounding a
tubular passage having a gas inlet and a gas outlet. A
plurality of end-to-end helical elements located in the
passage provide the gas moving through the passage with helical
patterns of movement. As the gas passes the leading edge of
each helical element, it is separated into separate gas
streams. Each gas stream rotates about its own center as
it flows in a helical path through the passage thereby
causing the foreign matter to collect on the cylindrical
wall.
A cylindrical jacket having a gas or liquid accommodating
chamber surrounds the cylindrical wall. The fluid in the
chamber contracts the cylindrical wall so that heat is trans-
ferred from the wall to the fluid. The transfer of heat
through the cylindrical wall causes a reduction in the tem-
perature of the gas flowing adjacent the inside of the l~all.
This causes condensation of vapors, as water, in the gas.
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~6~
The condensed liquid picks up smoke and particulates which
are collected on the inside of the cylindrical wall. In
one form of the invention the jacket is provided with a spiral
rib, which -facilitates helical flow of liquid in the chamber.
A pump operates to move the liquid through the chamber to
a location, such as a storage tank. The hot liquid can be
pumped to a desired location where the heat in the liquid
is utilized.
A liquid dispensing system is used in association with
each gas cleaning unit to introduce a cleaning liquid or
; cleaning solution into the passage. The cleaning solution
is carried with the gas through the passage to clean the
helical elements, as well as the inside wall of the cylindrical
member. The liquid dispensing system is also used as a flame
extinguishing system.
,,
IN TH~ DRAWINGS:
Figure 1 is a perspective view of a hood assembly equipped
with a gas cleaning and heat transfer apparatus according to
a first -form o-f the invention;
Figure 2 is a side elevational view of the gas cleaning
and heat transfer apparatus with the hood assembly of Figure
1 shown in section;
Figure 3 is an enlarged sectional view taken along line
3-3 of Figure 2;
Figure 4 is an enlarged sectional view taken along line
4-4 of Figure 3;
Figure 5 is a side elevational view of the gas cleaning
and heat transfer apparatus of Figure 3 with parts broken
away to show the inside jacket;
Figure 6 is a sectional view taken along line 6-6 of
Figure 4;
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Figure 7 is a fragmentary view partly sectioned of the
connection between adjacent helical elements;
Figure 8 is a sectional view taken along the line 8-8
of Figure 7;
Figure 9 is a reduced scale sectional view taken along
the line 9-9 of Figure 6;
Figure 10 is an enlarged sectional view of the lower
le-ft portion of Figure 6;
Figure 1] i.s a perspective view o-f a hood assembly
equipped with a gas cleaning and heat trans-fer apparatus
according to a second form of the invention;
Figure 12 is a side elevational view of the gas cleaning
and heat transfer apparatus with the hood assembly of Figure
11 shown in section;
: Figure 13 is an enlarged sectional view taken along the
line 13-13 of Figure 12;
Figure 14 is a sectional view taken along the line 14-14
of Figure 13;
Figure ].5 is an enlarged sectional view taken along the
20 line 15-15 ol Pigure 13;
Figure 16 is a side elevational view of the gas cleaning
and heat transfer apparatus of Figure 13 with parts broken
away to show the inside jacket;
Figure 17 is a sectional view taken along the line 17-17
of Figure 15;
Figure 18 is a fragmentary view partly sectioned of the
connection between adjacent helical elements;
Figure 19 is a sectional view taken along the line 19-19
of Figure 18;
Figure 20 is a reduced scale sectional view taken along
the line 20-20 of Figure 17; and
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Figure 21 is an enlarged sectional view of the lower left
portion of Figure 17.
DESCRIPTION OF PREPERRED EMBODIMENTS:
Re~erring to Figure 19 there is shown a hood assembly
indicated generally at 10 located over a cooking unit 11 for
collecting hot gases, water, smoke, grease and particulates
formed in the cooking operation. Cooking Wlit 11 has a generally
horizontal grill or flat heated plate 12. Heated plate 12 is
used to cook food, such as pancakes, meat products, eggs,
grits, and the like~ Cooking unit 11 can be a fryer, oven,
or broiler. A space 13 above grill 12 has a front opening to
al]ow access of the cullinary personnel to grill 12. Hood
~; assembly 10 extends over the top of space 13. Hood assembly
10 has a housing indicated generally at 1~ mounted on a support
(not shown), such as a wall or frame structure extended upwardly
-from cooking unit 11. Housing 1~ has a generally flat top
wall 16 joined to a downwardly directed front wall 17 and a
rear wall 18. Walls 16 - 18 surround a chamber or passage 19
having a bottom opening 21 facing the grill 12.
A fluid cleaning assembly indicated generally at 22
located in the rear portion of passage 19 is mounted on rear
wall 18. Fluid cleaning assembly 22 operates to separate
foreign matter, as particulates, grease, smoke and the like
foreign matter -from the hot gas flowing through the assembly.
Cleaning assembly 22 has a housing or casing comprising a top
generally horizontal top wall 26 located below top wall 16 of
the hood housing, a downwardly directed front wall 27, and a
downwardly and rearwardly inclined bottom wall 28. Walls
26 - 28 surround a chamber 2~. As shown in Figure 2, wall 18
adjacent bottom wall 28 has an outlet or drain port 29 through
which liquid and liquid-like materials separated from the gas
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~ 2 ~ ~
in cleaning assembly 22 flow from chamber 24 and drain to a
discharge tube 31. Tube 31 leads to a collection can or
container (not shown). The upper portion of housing 22 has a
gas outlet port or passage 32 leading to a duct 33 for carrying
gas, such as air, to a desired location. Gas moving means
indicated generally at 34 functions to draw gas through chamber
24 and discharge the gas through duct 33. Gas moving means 34
is diagrammatically shown as a rotating fan or blower 36 driven
by electric motor 37. Other types of gas moving units, such
as one or more motor driven blower units, can be used to draw
gas through chamber 240
As shown in Figure 3, a plurality of gas cleaning units
38, 39 and 40 are located in chamber 24. The number of gas
cleaning units in chamber 24 can vary in accordance with the
length of the chamber. Gas cleaning uni~s 38 - 40 are identical
in construction. The following description is directed to
cleaning unit 38, as shown in Figure 4 - 9. Gas cleaning
unit 38 has an interior cylindrical casing or tube 41 having
an inside cylindrical surface 42. Tube 41 has a heat con-
ducting cylindrical wall of metal, such as stainless steel,
copper or the li~e. A plurality of outwardly directed arms
43, 44, 45 and 46 are secured to the upper end of tube 41.
~ut and bolt assemblies 47 secure the arms 43 - 46 to top wall
26.
Referring to Figure 6, top wall 26 has a cylindrical hole
or opening 48 aligned with the cylindrical passage 49 formed by
the inside surface 42 of tube 41. A plurality of end-to-end
helical elements 51, 52 and 53 are located in passage 49.
First helical element 51 has a leading transverse edge 54
located below opening 48 in wall 26. Flement 51 has a 180
degree twist with a trailing transverse edge 56 located in
--5--
generally the same vertical plane as the leading edge 54.
Element 51 has an outer helical edge 57 that is located in
engagement with the inside cylindrical surface 42 of tube 41.
The trailing edge 56 has a center notch 58 accommodating a
notch 61 in leading edge 59 of helical element 52. As shown
in Figure 7, leading edge 59 has a rounded or semicircular shape.
Figure 8 shows the trailing edge 56 as having a converging or
feathered shape. Leading edge 59 of second element 52 is
oriented 90 degrees relative to the trailing edge 56 of first
element 51. Second element 52 has a trailing edge 62 that is
circumferentially oriented 90 degrees relative to a leading
edge 63 of the third element 53. Third element 53 has a lower
transverse edge 64 located and generally aligned with the lower
end oE tube 41. Helical elements 51, 52 and 53 have the same
twist or helical turn. They are circumferentially oriented 90
degrees relative to each other so that, as the gas, smoke,
water and particulates entrained in gas move through passage
49, the gas stream is divided into separate helical streams.
The centrifugal forces on the smoke and particulates carried
by the gas are separated :Erom the gas and collected on the
inside surface 42. The particulates and water will flow down
with the moving gas to the lower or exit end 66 of tube 41.
The longitudinal length of each helical element is about one
and one-half times the diameter of the element. Other size
relationships between thelength and diameter of the helical
elements can be used. Helical elements 51, 52 and 53 can have
twists other than 180 degrees. For example, twists of 30
degrees, 45 degrees, 60 degrees, 90 degrees, 120 degrees, 150
degrees and otherscan be used for each helical element. The
number of helical elements in each tube varies with the length
o the tube.
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An annular member or material collecting ring indicated
generally at 69 is located adjacent the lower or exit end of
tube 41. Member 69 has an inner end 71 spaced inwardly from
the exit end 66 of tube 41 providing therewith an annular
throat 72, as shown in Figures 6, 9 and 10. As shown in
Figure 10, inner end 71 is located a short distance below the
lower end 67 of tube 41. End 71 has a convex curved shape to
minimize turbulence and gas pressure build-up in the throat or
annular passage 72. End 67 has a convex curved shape and an
arcuate outside portion 68. Portion 68 provides a smooth,
curved surface joined to the outside surface of tube 41 and
: eliminates a sharp outer edge which causes ~urbulence and an
: obstruction to gas flow through annular pocket passage 76.
~ember 69 has an upwardly and outwardly curved outer end 73
spaced outwardly from end 66 of tube 41. A plurality of con-
: necting members or plates 74 secure annular member 69 to tube
41. The mid-portion of annular member 69 has a plurality of
holes 77 which allow the liquids and fluid-like materials
collected in annular pocket or recess 76 to drai.n onto bottom
wall 28. A tubular member or pipe can be directly connected to
annular member 69 to carry the liquids and fluid-like materials
to a storage container.
As shown in Figures 5 and 6, a cylindrical jacket 78
surrounds tube 41. Jacket 78 has an upper end 79 and a lower
end 81 secured by welds or the like to the outer surface of
; tube 41. A spiral or helical-shaped side wall 82 extends be-
tween upper end 79 and lower end 81. Side wall 82 has an
inwardly directed spiral rib 83 that is located close to the
outside wall of tube 41 and a spiral passage 84 accommodating
a liquid 85, as water, ethylene glycol and the like. Tube
41, being metal, transmits heat from the hot gas moving through
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passage 49 to liquid 85. A copper spiral tube carrying water
can be wound around tube 41 to pick up heat from the tube 41.
As shown in Figure 6, a connector 87 joins a liquid inlet
tube 86 through a li.quid inlet pipe or mani-fold 91. Pipe 91
extends adjacent cleaning units 38, 39 and 40 and feeds liquid
to the units. Returning to Figure 3, a pump 92 driven by an
electric motor 93 -functions to regulate the flow of liquid
through the spiral passage 84. Motor 93 is connected to a
thermostatically responsive control 94 whereby the speed of
motor 93 is regulated in response to the temperature of the
liquid flowing from the cleaning units 38, 39 and 40. An
on-of valve 95 in the inlet supply pipe 96 is used to manually
control the flow of liquid in the system. The on-off valve 95
can be used in lieu of the pump 92 to provide manual control
for the flow of liquid through the liquid carrying passages 84
of cleaning units 38 - 40.
Returning to Figure 6, the upper end of side wall 82
carries an outlet connector 89 joining a liquid outle~ tube
88 through an outlet pipe or tubular member 97. Pipe 97 is
connected to each of the upper ends of each of the cleaning
units 38 - 40 and leads to a storage tank 98 used to store the
~ hot liquid. An outlet tube or pipe 99 connected to tank 98
; carries the hot liquid to a selected location, such as heating
: radiators or a hot water supply system.
A sleeve 100 surrounding jacket 78 provides insulating
means or a heat barrier. Sleeve 100 is an elongated cylindrical
member that is preferrably of heat insulating material, such as
ceramic or brick. Sleeve 100 may be a metal member. Sleeve
100 has a lower inwardly turned end 101 that engages the lower
30 end of tube 41. End 101 has one or more drain holes lOlA
allowing liquid to drain from space 102 into pocket 76. The
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upper end of sleeve 100 has outwardly directed flanges or ears
103 that accommodate the nu~ and bolt assemblies 47. Spacers
104 surrounding the nut and bolt assemblies 47 separate ears
103 from arms 43 - 46 and transmit the clamping force of the
nut and bolt assembly 47 to both arms 43 - 46 and ears 103.
Sleeve 100 has a diameter greater than the diameter of the
side wall 82 and forms therewith an annular air space 102.
The air space 102 and sleeve 100 serve as a heat barrier to
minimize the transfer of lleat from the side wall 82 i.nto the
air moving through chamber 2~. Grommets 106 and 107 mounted in
holes on sleeve 100 accommodate liquid inlet tube 86 and
liquid outlet tube 88.
Returning to Figure 3, a liquid, as water, is dispensed
into the passage l9 above each o-f the openings 48. The liquid
can be a cleaning solution, such as a detergent or sanitizer,
used to wash the helical elements and cylindrical inside wall
42. The liquid can also be used to control the temperature of
the gas flowing through the cleaning units 38, 39 and 40 and
extinguish any ~ire in the cleaning units. The liquid is
dispensed through nozzles 116, 117 and 118 mounted Oll the hood
top wall 16. Each nozzle 116, 117 and 118 is connected to a
manifold or feed pipe 119 leading to a source of liquid under
pressure. Pipe 119 is connected to suitable controls, including
valves (not shown), which can be operated to control the flow
of liquid in pipe llg. The liquid is subjected to pressure so
that it flows through the nozzles 116, 117 and 118 and is
dispensed as a spray or mist into the passages 49 of tubes ~1.
In use, gas moving means 34 is operated by motor 37 to
move gas through the hood assembly 10 and discharge clean gas
: 30 to a desired location, such as a gas treating module or the
environment surrounding the cooking unit. The gas, as shown
g
in Figure 1, is moved from space 13 above grill 12, as indicated
by the arrows 109, into passage 19 of hood assembly 10. The
moving gas picks up the foreign matter, such as water, parti-
culates, grease, smoke and odors generated by cooking food
products on grill 12. The foreign matter is entrained in the
gas and are moved with the gas through the openings 48 in the
top wall 26 of fluid cleaning assembly 22.
Referring to Figure 6, the gas moves down through the
cylîndrical passage 49 of tube 41. Helical elements 51, 52,
and 53~ being oriented 90 degrees with respect to each other,
divide the gas stream into separate gas streams. The leading
edge of each element divides the gas stream into two separate
gas streams. The twist of the helical element causes the gas
to move in spiral flow patterns. This subjects the foreign
matter carried by the gas to centrifugal force causing the
foreign matter to move outwardly against the cylindrical sur-
face 42 of tube 41. At each succeeding helical element, the
air streams are further divided. The number o-f air stream
divisions produced is 2n, where n is the number of helical
elements.
The geometry of the helical twist of the helical elements
51, 52 and 53 produce rotational circulation of the gas stream
about the pneumatic axis of each helical gas stream. This
produces additional centrifugal force on the foreign matter,
driving the foreign matter into engagement with the inside
surface 42.
The gas moving through passage 49 is at a temperature
above the atmospheric temperature due to the heat from the
grill 12. Part of the heat in the gas is transferred to tube
41. This results in a drop in the temperature of the gas and
an increase in the temperature of the tube 41. Tube 41 is
- 1 0 -
cooled by liquid 85 in the helical passage 84. l`he cool tube
41 enhances the transfer of heat from the gas through tube 41
and to liquid 85. When the particulates, water vapors, and the
like approach and contact cool tube 41, they condense and merge
into liquid droplets, which are collected on surface 42. The
condensation is caused by a drop in the temperature of the gas
and foreign matter in the gas adjacent the inside surface 42
of tube 41. The centrifugal force acting on the foreign matter
concentrates the foreign matter adjacent the inside surface
42 of tube 41 and facilitates the condensation process.
The gas cleaning unit 38 utilizes a number of mechanisms
to remove the foreign matter from the air. The mechanisms
include the centrifugal force, gravity~ inertial compaction,
direct interception, absorption, and coagulation. These
mechanisms function in conjunction with the condensation of
gases into liquids caused by the cool tube 41. Liquids and
particles, along with the condensed liquid droplets, will
collect on the inside surface 42 and flow downwardly to material
collector ring 69. The dry particles, as dust and smoke, will
be moved under the influence of centrifugal force into engagement
with the inslde surface 42 and mix and impinge on the liquid
droplets. The liquid droplets function as an adhesive or
collective agents which retains the dry particulates and remove
the particulates and smoke from the gas stream. Odor molecules,
pollens, and the like will also impinge and adhere to the
collected liquid droplets.
Material collecting ring 69 functions to catch the collected
foreign matter as it leaves the lower end of tube 41. An
annular sheath of gas moves through annular throat 72 between
the inlet end or lip 71 of annular ring 69 and the lower edge
66 of tube 41. This accelerates the gas and carries collected
- 1 1 -
matter 112 down into pocket 76 of ring 69. The collected
matter, being liquid or semi-liquid, flows -through holes 77
and along bottom wall 28 through drain hole 29. Tube 31 carries
the collected foreign matter to a collection container. As
shown in Figure 10, pocket 76 located between collecting ring
69 and lower end 67 of tube 41 increases in width from throat
72. This causes a reduction in the speed of the gas flow, which
enhances the retention of the :Eoreign matter in pocket 76.
The cooled and clean gas in the central portion of passage 49
flows through the center hole ln ring 69 and is drawn by gas
moving means 34 through exit passage 32 and discharged in a
desired location.
Pump 92 driven by motor 93 delivers liquid, such as water,
to spiral passage 84 of jacket 78 of each gas cleaning unit.
The liquid moves in a spiral pattern, as shown by arrows 111
in Figure 5. As the liquid moves over the outside surface of
tube 41, it picks up the heat -from the tube 41 thereby lowering
the temperature of tube 41 and gas in the passage 4g. The
heated liquid is carried by return plpe 97 to storage tank 98.
The heated liquid in tank 98 is useable for heating and cleaning
purposes. For example, the heated liquid in tank 98 can be
directed to a dishwasher. The liquid circulating system,
being a closed system, is not subjected to contamination
which would reduce the utility of the heated liquid.
Referring to Figure 11 there is shown a hood assembly
indicated generally at 120 having a gas cleaning and heat
transfer apparatus according -to a second form of the invention.
Hood 120 is poised over a cooking unit 121 for collecting
hot gases, water, smoke, grease and particula-tes formed in
a cooking procedure. Cooking unit 121 has a generally hori-
zontal grill 122. Grill 122 is used to cook -food, such as
-12-
pancakes, meat products, eggs and the like. A space 123 abovegrill 122 permi-ts access to the grill by cullinary personnel.
Hood assembly 120 extends over the top o-f space 123. Hood
assembly 120 has a housing indicated generally at 124 mounted
on a support (not shown), such as a wall or frame structure
extended upwardly from cooking unit 121. Housing 124 has a
generally flat top wall 126 joined to a downwardly directed
front wall 127 and a rear wall 128. Walls 126 - 128 surround
a chamber or passage 129 having a bottom opening 131 in -facing
relationship to grill 122.
A fluid cleaning assembly indicated generally at 132
loaated in the rear portion of passage 129 is mounted on rear
wall 128. Fluid cleaning assembly 132 operates to separate
foreign matter from the hot gas flowing through the assembly.
Fluid cleaning assembly 132 has a housing or casing 133 com-
prising a generally horizontal top wall 136 located below the
top wall 126 of the hood housing, a downwardly directed front
wall 137, and a downwardly and rearwardly inclined bottom wall
138. Walls 136 - 138 surround a chamber 134. As shown in
Figure 12, wall 128 adjacent bottom wall 138 has an outlet
or drain port 139 through which liquid and liquid-like materials
separated from the gas in cleaning assembly 132 flow from
chamber 134 to a discharge tube 141. Tube 141 leads to a
collection facility (not shown). The upper portion of housing
132 has a gas outlet port or passage 142 leading to a duct 143
for carrying gas, such as air, to a desired location. Gas
moving means indicated at 144 functions to draw gas through
chamber 134 and discharge the gas through duct 143. Gas
moving means 144 is shown to include a blower 146 driven by an
electric motor 147.
As shown in Figure 13, a plurality of gas cleaning units
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1~8, 149 and 150 are located in chamber 134 and can be identicalin construction whereby the following description is limited to
cleaning unit 148, as shown in Figures 15 - 20. Gas cleaning
unit 148 has an interior cylindrical casing or tube 151 having
an inside cylindrical surface 152. Tube 151 has a heat con-
ducting cylindrical wall of metal, such as stainless steel,
copper or the like. Tube 151 has an outwardly directed, un-
interrupted radial flange 153 disposed along the upper edge
thereo-f. Flange 153 is secured to the top wall 136 by a
plurality of nut and bolt assemblies 157.
Referring to Figure 17, top wall 136 has a cylindrical
hole or opening 158 aligned with the cylindrical passage 159
formed by the inside surface 152 o-f tube 151. A plurality
of end-to-end helical elements 161, 162 and 163 are located
in passage 159. First helical element 161 has a leading
transverse edge 164 located below opening 158 in wall 1360
Element 161 has a 180 degree twist with a trailing transverse
edge 166 located in generally the same vertical plane as the
leading edge 164. Element 161 has an outer helical edge 167
Z0 that is located in engagement with the inside cylindrical
surface 152 o~ tube 151. The trailing edge 166 has a center
notch 168 accommodating a notch 171 in leading edge 169 of next
helical element 162. As shown in Figure 18, leading edge
169 has a rounded or semicircular shape. Figure 19 shows the
trailing edge 166 as having a converging or feathered shape.
Leading edge 169 of second element 162 is oriented 90 degrees
relative to the trailing edge 166 of first element 161.
Second element 162 has a trailing edge 172 that is circum-
ferentially oriented 90 degrees relative to a leading edge 173
of the third element 163. Third element 163 has a lower trans-
verse edge 174 located and generally aligned with the lower end
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of tube 151. Helical elements 161, 162 and 163 have the same
twist or helical turn. They are circumferentially oriented
90 degrees relative to each other so ~hat as the gas, smoke,
water and particulates entrained in gas move th~rough passage
159, the gas stream is divided into separa~e helical streams.
The centrifugal forces on the smoke and particulates carried by
the gas are separated from the gas and collected on the inside
sur-face 152. The particulates and wate-r will flow down with
the moving gas to the lower or exit end 176 of tube 151. The
longitudinal length of each helical element can be about 1 and
1/2 times the diameter of the element.
An annular member or material collecting ring indicated
generally at 179 is located adjacent the lower or exit end of
tube 151. Member 179 has an inner end 181 spaced inwardly
from the exit end 176 of tube 151 providing therewith an
annular throat 182, as shown in Figures l9, 20 and 21. As
shown in Figure 21, inner end 181 is located a short distance
below the lower end 177 of tube 151. End 181 has a convex
curved shape to minimize turbulence and gas pressure build-up
in the throat or annular passage 182. F,nd 177 has a convex
curved shape and an arcuate outside portion 178. Portion
178 provides a smooth curved surface joined to the outside
surface of tube 151 and eliminates a sharp outer edge which
causes turbulence and an obstruction to gas flow through
annular pocket passage 186. Member 179 has an upwardly and
outwardly curved outer end 183 spaced outwardly from end 176 of
tube 151. A plurality of connecting members or plates 184
secure annular member 179 to tube 151. The mid-portion of
annular member 179 has a plurality of holes 187 which allow
the liquids and fluid-like materials collected in annular
pocket or recess 186 to drain onto bottom wall 138.
-15-
As shown by Figures 16 and 17, a continuous spiral vaneor helical fin 188 surrounds tube 151 and is connected thereto
by suitable means such as welds. Fin 188 has a circular outer
edge. The outer edge can be square to fit in a square passage.
Fin 188 is preferably formed of a suitable high heat con-
ductive metal. Fin 188 transmits heat from tube 151 and the
hot gas moving through passage 159. A sleeve or jacket 189
surrounds fin 188 to provide a relatively airtight chamber 192
and a heat barrier. Jacket. 189 is an elongated cylindrical
member that is preferably of heat insulating materials such
as ceramic, brick, or even metal. The inside surface of jacket
189 is spaced slightly from the outer peripheral edge of fin
188. Jacket 189 has a lower inwardly turned end 191 that
engages the lower end of tube 41 in relatively airtight relation-
ship. The chamber 192 is formed between sleeve 189 and tube
151. An outwardly directed radial flange 193 extends out-
wardly from the upper end of sleeve 189 and is in flush contact
with the lower surface of flange 153 on tube 151. The nut and
bolt assemblies 157 hold the flange 193 of sleeve 189 in
relatively airtight relationship to the flange 153 of tube
151.
As shown in Figures 13 and 14, an air inlet duct 195
is provided to supply air or other suitable fluid to chamber
192 of jacket 189 of gas cleaning unit 149, as well as to the
jackets 189A, 189B of gas cleaning units 149, 150. Inlet
duct 195 has a generally linear air passage 196 wherein air
is moved by suitable means such as a fan 197 driven by a motor
198. Jacket 189 has an air inlet opening 199 located in the
lower portion thereof. A deflector 201 is positioned adjacent
air inlet opening 199 slightly downstream thereof and extends
into the stream of passage 196. Deflector 201 deflects a
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.
portion of the air passing through the passage 196 into thejacket 189 through the opening 199.
In like fashion, jacket 189A o-f second gas cleaning unit
149 has an inlet opening 202 in the lower portion thereof. A
de~lector 203 extends from ~he downstream edge of opening 202
into the stream of passage 196. Deflector 203 extends slightly
further into passage 196 than the first deflector 201 and is
; operative to deflect another portion of the stream of air
passing through the passage 196 into the jacket 189A through
the opening 202. Third gas cleaning unit 150 has an opening
205 in the lower portion thereof through the jacket 189B.
Duct 195 has a rounded end 206 terminating adjacent the down-
stream edge of the opening 205 whereby the remaining air
passing in passage 196 is deflected through the opening 205
into the jacket 189B.
An exhaust duct 207 provides a linear exhaust passage
for exhaust of air from the upper part of gas cleaning units
148 - 150. Exhaust duct 207 is connected to an exhaust opening
in jacket 189 indicated at 210 in Figure 16 to carry air
exhaust therefrom to a place of use or disposal, as for example,
for warming a room. Exhaust duct 207 in like fashion connects
with suitably provided exhaust openings on the remaining air
cleaning units 149, 150. Exhaust opening 210 is located
vertically above inlet opening 199 on jacket 189.
Air is driven by fan 197 through inlet duct 195 entering
in gas cleaning units 148, 149, 150 through inlet openings
199, 202, 205. Deflector 201 deflects a portion of the passing
air stream through the inlet opening 199 to jacket 189. The
air enters the lower portion of jacket 189 of gas cleaning
unit 148, entering the chamber 192. Spiral fin 188 causes
an upward movement of the air in a circulating pattern around
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z~'~
tube 151. As it circulates, the air draws heat from the walls
of tube 151 transferred from hot gases and entrained particulate
matter passing therethrough. Heat is also transferred to the
air in chamber 192 by spiral fin 188. The space between the
inside wall of the jacket 189 and spiral fin 188 prevents heat
transfer through the wall of jacket 189. When ~he heated
air reaches the upper ends of gas cleaning units 148, 149, 150
it exits through the exhaust openings 210, 211, 212. It is then
carried by the exhaust duct 207 to a desired location. For
example, the air can be used to heat a room, heat water, or
it can simply be exhausted.
Referring to Figure 13, a liquid, as water, can be dis-
pensed into passage 129 above each of the openings 158 for
purposes of cleaning, sanitizing, temperature con~rol, fire
extinguishing or the like. The liquid is dispensed through
the nozzels 216, 217 and 218 mounted on the hood top wall 126.
:,
Bach nozzle 216, 217, 218 is connected to a manifold or feed
pipe 219 leading to a source of liquid under pressure. Pipe
219 is connected to suitable controls, including valves (not
shown), which can be operated to control the flow of liquid
in pipe 219. The liquid is subjected to pressure so that it
flows through the nozzles 216, 217 and 218 and is dispensed
as a spray or mist into the passages 159 of tubes 151.
; IJse of the gas cleaning assembly is much like that as
described with the embodiment shown in Figures 1 through 10.
Gas moving means 144 is operated by motor 147 to move gas
through the hood assembly 120 and discharge cleansed gas to a
desired location. The gas is cleaned and heat is drawn -from
it as it is moved through the assembly. The gas, indicated
30 by arrows 209 shown in Figure 11, is moved from the space 12
above the grill 122 in~o passage 129 of hood assembly 120.
-18-
The foreign matter is entrained in the gas and is moved with
the gas through the opening 158 in the top wall 136 of fluid
cleaning assembly 132.
Reffering to Figure 17, the gas moves down through the
cylindrical passage 159 of tube 151. Helical elements 161,
162 and 163, being oriented 90 degrees with respect to each
other, divide the gas stream into separate gas streams. The
gas is made to flow in spiral flow patterns subjecting the
foreign matter carried by the gas to centrifugal forces causing
the foreign matter to move outwardly against the cylindrical
surface 152 of tube 151.
The gas moving through the passage 159 is at a temperature
elevated above the atmospheric temperature due to the heat
from the grill 122. Part of the heat and gas is transferred
to the tube 151. This decreases the temperature of the gas
and increases the temperature of the tube 151. Tube 151 is
~ cooled by passing air in the chamber 192. When the particu-
: lates, water vapors, and the like approach in contact with the
cool tube 1519 they condense and merge into liquid droplets which
are collected on the surface 152. Liquids and particles,
along with the condensed liquid droplets, collect on the inside
surface 152 and flow downwardly to material collector ring
179. The liquid droplets function as adhesive or collective
agents which retain dry particulates that might be also en-
trained in the gas. Odor moleculcs, pollens and the like will
also impinge and adhere to the collected liquid droplets.
: Material collecting ring 179 functions to catch the
collected foreign matter as it leaves the lower end of tube
lSl. Annular sheath of gas moves through the annular throat
30 182 between the inlet end or lip 181 of annular ring 179 and
the lower edge 176 of tube 151. This accelerates the gas and
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carries collected matter 222 down into pocket 186 o-f ri.ng 179.
The collected matter, being liquid or semi~ uid~ flows through
the holes 187 and along the bottom wall 138 through the drain
hole 139. Tube 151 carries the collected foreign matter ~o a
collection container. As shown in Figure 21, pocket 186
located between collecting ring 179 and lower end 177 of tube
151 increases in width -from throat 182 causing a reduct.ion in
the speed of gas 1OW, which enhances the retention of foreign
matter in pocket 186. The cooled and cleaned gas in the central
portion of passage 159 flows through the center hole and ring
179 and is drawn by gas moving means 144 through exit passage
142 and discharged at a desired location.
Pan 197 driven by motor 198 delivers gas such as air to
i.nlet duct 195 where it enters the jackets 189 of the gas
cleaning units through inlet openings 199, 202, 205. The air
moves through the gas cleaning unit, as the unit 148, in an
upward spiral pattern, shown by the arrows 221 in Figure 16,
directed by the spiral fin 188. As the air moves over the
outside surface of tube 151, it picks up heat from the tube
20 151 and the fin 188 thereby lowering the temperature of tube
151 and the gas in the passage 159. The heated air is carried
by return duct 207 to a place of disposition. The air carried
by return duct 207 is not contaminated and can be used for a
suitable function.
The above disclosure comprises two embodiments of the gas
~: cleaning unit of the invention, as incorporated in a cooking
:~ hood. The gas cleaning unit can be used with other apparatuses
for accommodating gases, liquids, and like fluids and in other
environments to remove foreign matter -from the fluids. It is
understood that changes in the materials, number of air cleaning
units, and the si~e and length of the helical elements located
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z~
in tubes 41 can be made by those skilled in the art withoutdeparting from the invention. The pitch and length of the
helical elements can vary, as well as the number of helical
elements that are placed in end-to-end or series in tubes 41.
The angular relationship between adjacent ends of the helical
elements can vary. Also, the angular positions of the opposite
ends relative to each other of the helical elements can be
altered. The invention is de-fined in the following claims.
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