U.S. patent number 3,707,855 [Application Number 05/178,923] was granted by the patent office on 1973-01-02 for garment finishing combination.
Invention is credited to Norman A. Buckley.
United States Patent |
3,707,855 |
Buckley |
January 2, 1973 |
GARMENT FINISHING COMBINATION
Abstract
A garment finishing system comprised of a finisher having a heat
exchanger and a steam discharge nozzle, and a low pressure steam
boiler coupled to the finisher in a manner so that the finisher
heat exchanger outlet is located vertically higher than the boiler
water level thereby allowing gravity condensate return and infeed
to the boiler, and makeup water infeed to the boiler generally from
line pressure and without a pump. Most professional cleaning plants
have available high pressure steam systems generally between 55 and
125 psi, and consequently most garment finishers are designed to be
used with these available high steam pressures. The cost of having
steam boilers of this high pressure is substantial, but even more
important, many safety codes preclude the operation of such systems
under certain conditions. For example, under some codes the
accepted use of high pressure steam systems requires special room
enclosures for or locations of the boiler and/or possibly the
continued presence of a certified operator. The code distinction
between low and high pressure steam systems frequently is made at
15 psig, based on ASME (American Society of Mechanical Engineers)
and BOLA (Building Officials Conference of America). Based in part
on the above code restrictions, in coin-ops or self-service
installations where non-technical customers would operate
unattended finishing equipment, certain types of finishing
equipment have heretofore not been used.
Inventors: |
Buckley; Norman A. (Wauwatosa,
WI) |
Family
ID: |
22654454 |
Appl.
No.: |
05/178,923 |
Filed: |
September 9, 1971 |
Current U.S.
Class: |
68/6; 68/20 |
Current CPC
Class: |
D06B
5/24 (20130101); D06F 73/02 (20130101); D06F
87/00 (20130101) |
Current International
Class: |
D06B
5/24 (20060101); D06B 5/00 (20060101); D06F
87/00 (20060101); D06F 73/00 (20060101); D06F
73/02 (20060101); D06c 001/00 () |
Field of
Search: |
;68/5C,6,20 ;223/51 |
References Cited
[Referenced By]
U.S. Patent Documents
Foreign Patent Documents
Primary Examiner: Price; William I.
Claims
What is claimed is:
1. A garment finishing combination, comprising a garment finisher
and a steam generating boiler disposed in adjacent side by side
closely coupled relationship; said finisher having means to support
a garment, means to blow air over the garment, means including a
heat exchanger to heat the air for drying the garment, means
including an air vent from near the condensate discharge end of the
heat exchanger and including means for closing the vent when steam
is at said vent; the steam generating boiler having a chamber and
having means for maintaining a generally constant water level and
steam pressure therein; and line means between the boiler and the
finisher, and said boiler being located adjacent the finisher and
relative to the finisher so that the condensate discharge end of
the heat exchanger is at a minimum head of approximately 4 inches
above the boiler water level to allow condensate return along the
line means by gravity to the boiler.
2. A garment finishing combination according to claim 1, further
including a steam discharge nozzle operable to condition the
garments, and means connecting the boiler to the steam discharge
nozzle and including a control valve for controlling steam
discharge.
3. A garment finishing combination according to claim 2, further
including a fixed size flow control restriction in the means
connecting the boiler and steam discharge nozzle.
4. A garment finishing combination according to claim 1, wherein
said line means includes a condensate return line, and wherein
check means in said condensate return line permits condensate flow
in the direction only from the finisher to the boiler.
5. A garment finishing combination according to claim 1, further
including means on the boiler to limit the generation of pressure
therein to 15 psig.
6. A garment finishing combination according to claim 1, further
including means on the boiler to limit the generation of pressure
therein, wherein the steam boiler pressure is at least
approximately 10 psig less than the water pressure of the available
fresh water supply line, and wherein a water makeup line is from
the water supply line to the boiler.
7. A garment finishing combination according to claim 6, further
including means in the finisher including a nozzle to discharge
steam to condition the garments, means connecting the boiler to the
nozzle, and means along the connecting means including a flow
control restriction and a control valve for controlling steam
discharge.
8. A garment finishing combination according to claim 6, wherein
the garment finisher and steam generating boiler are horizontally
separated by at most 8 ft.
9. A garment finishing combination, comprising a garment finisher
and a steam generating boiler disposed in adjacent side by side
closely coupled relationship; said finisher having means to support
a garment, means including a nozzle to discharge steam to condition
the garment, means to blow air over the garment, means including a
heat exchanger to heat the air for drying the garment, a steam
inlet connection to and a condensate return connection from the
finisher, conduit means in the finisher between the steam inlet and
condensate return connections and including said heat exchanger and
a takeoff to the nozzle, the takeoff from the conduit means being
located generally between the inlet connection and the heat
exchanger and including a flow control restriction and a control
valve, means including an air vent from the conduit means generally
between the heat exchanger and the outlet connection, said vent
means including means for closing the vent when steam is at said
vent; the steam generating boiler having a chamber and having means
for maintaining a generally constant water level therein and having
means for adding heat for generating steam up to a set pressure,
and a steam outlet from and condensate return to the boiler
chamber; steam line means between the boiler steam outlet and the
finisher inlet connection and condensate return line means between
the finisher outlet connection and the boiler condensate return and
said finisher condensate connection being at a minimum head of
approximately 4 inches above the boiler water level to allow
condensate return by gravity to the boiler.
10. A garment finishing combination according to claim 9, further
including means on the boiler to limit the generation of pressure
therein, wherein the steam boiler pressure is at least
approximately 10 psig less than the water pressure of the available
fresh water supply line, and wherein a water makeup line is from
the water supply to the boiler.
Description
This invention relates to, and the main object of the invention is
to provide, a garment finishing system particularly suited for use
in isolated installations and/or with low pressure steam, such as
for use in coin-ops where high pressure steam is not available
and/or cannot be used for economic or other reasons.
The disclosed garment finisher has a steam discharge for steam to
condition the garment and a steam heated exchanger to heat air for
drying the garment, and these components are closely coupled to a
steam boiler in a manner to allow gravity return of condensate back
to the boiler. The combination can be operated at widely varying
steam pressures, but is particularly suited for use with low
pressure steam of less than 15 psi. Since many existing water
systems are typically at pressures well above 15 psi, such as
between 20 and 60 psi, and because of gravity feed condensate
return, there is no need for a separate condensate collecting tank
and/or a booster pump and the condensate and makeup water lines can
be directly connected to the boiler. This lowers the overall cost
of the installation and reduces the number of components that can
fail.
The invention will be more fully understood and appreciated after
reviewing the following specification, the accompanying drawing
forming a part thereof; wherein
FIG. 1 is a schematic type elevational view showing a preferred
embodiment of the subject garment finisher and steam boiler
combination; and
FIG. 2 is a similar schematic type view showing only the coupling
externally of the disclosed garment finisher of a more conventional
remotely located high pressure steam boiler system.
The disclosed finisher has a steam inlet connection that is
directed through a control valve and flow control restriction to a
nozzle for discharging conditioning steam and that is also directed
through a heat exchanger for heating garment drying air, and air
vent means are located at the condensate discharge end of the heat
exchanger. A boiler having a generally constant water level is
coupled to the finisher with the condensate discharge end of the
heat exchanger located at least approximately 4 inches above the
boiler water level to allow condensate return by gravity from the
heat exchanger back to the boiler. A water makeup inlet to the
boiler is provided with a float type automatic level control.
The garment finisher 10 shown is a batch box finisher, where a
large cabinet 12 has a support or rack 14 on which a hanger 16 is
hooked and a garment 18 is suspended thereon to its full natural
contour. The cabinet has an access opening (not shown) through
which the operator can load and unload the hanger and garment, and
a door typically would close the opening. To condition the garment,
live steam is discharged from a steam outlet nozzle 20 to within
the cabinet to condense on the garment for relaxing the fibers.
There is also provided in the finisher 10 a means for blowing air
over the garment to dry it. In this regard, a blower 22 has an
inlet 24 open to the enclosure at its lower end and an outlet
connected to a channel 26 for discharge at the upper end of the
enclosure for air flow downwardly over the garment. A heat
exchanger 28 in the channel 26 heats the air normally to
temperatures in excess of 150.degree.F to dry the garment, but much
higher air temperatures to 250.degree.-350.degree.F can be used to
help set the garment in a wrinkle-free finished manner if
desired.
The disclosed invention resides in the location of the finisher
heat exchanger and its connection relative to a steam generating
boiler, and further in the manner of providing a live steam
discharging outlet. As shown in FIG. 1, a steam generator boiler 30
is located closely adjacent the finisher and heat exchanger
therein. This boiler can be of a typical manufacture, even of a low
pressure or 15 psi output capacity.
The boiler has a casing 32 which defines a chamber adapted to hold
water up to water line 34 and where steam when generated is above
this line as at 36. If the pressure of the available water supply
system is at least approximately 10 psi higher than the steam
boiler pressure, which typically is the case when a low pressure
boiler is used, makeup water to the boiler is possible by direct
connection to a water system line. The water system line 38 is thus
connected through control valve 40 and line 42 to the boiler tank
32, and a float 44 carried on a lever 46 pivoted at pin 48 and
operatively connected through linkage 50 can operate the valve 40.
Thus demand for water in the boiler is sensed by the water level
dropping which lowers the float 44 to open the valve 40 and admit
more water, where at the proper water level the buoyed float 44
closes the valve.
A heating source, generally shown at 52, is in the boiler proximate
the water to generate the steam as required. An overfill safety
device 54 can be operated off the float to prevent or stop
operation of the heater 52 should the water level rise beyond the
accepted level. Likewise, a pressure responsive control 56 can be
used to control the heat element 52 for normal cycling. For
example, if 15 psi pressure were desired and set on the control 56,
the heater means would operate until the generated steam reached 15
psi pressure and the control would then terminate the operation of
the heater means.
A steam line 58 is connected between the boiler steam chamber 36
and a steam inlet connection 60 formed on the finisher 10. Likewise
a steam condensate line 62 is connected between condensate
connection 64 of the finisher 10 and the boiler chamber 32, and a
one way check valve 66 is in the line to limit condensate flow from
the finisher to the boiler. The boiler 30 and finisher 10
preferably are closely coupled together or are side by side within
an 8-foot separation. The heat exchanger condensate discharge
connection 64 is located higher than or above the water level line
34 in the boiler as shown at 68 a minimum of 4 inches, and this
provides that condensate can return by gravity from the connection
64 through the check valve 66 to the boiler.
This typical 4 inch minimum head overcomes the resistance of the
line and check valve with the boiler and finisher closely coupled
in side by side relation with less than 8 feet separation. However,
if it were desired to separate the components more horizontally,
then the minimum head 68 between the condensate outlet connection
64 and the water level 34 would have to be increased. The minimum
declining overall pitch in the line 62 should be no less than
approximately one-half inch vertical drop per feet horizontal
separation of the unit.
Referring now to some specifics of the finisher 10, note that line
70 connects steam inlet connection 60 with heat exchanger 28 and
the heat exchanger in turn flows continuously to a tee 72 and
through line 74 to outlet condensate connection 64. Under most
circumstances with a serpentine or coil type heat exchanger,
condensate connection 64 is located lower than inlet connection 60;
whereas a header type heat exchanger might have these connections
almost even. The tee 72 is located generally at or near the
discharge end of the heat exchanger, and upright line 76 from the
tee leads to a conventional air bleed valve 78, of the heat or
moisture sensitive type for example. Consequently, this vent opens
automatically when no steam is at the device but closes when steam
reaches the device. Any air in the system is forced by the steam
moving through the heat exchanger to the tee 72 and then escapes
through the open vent. Since air in the system can block effective
steam flow through the heat exchanger, the location and operation
of this air bleed therefore is rather critical, particularly with
this gravity condensate return boiler coupling.
Connected off of steam line 70 is a line 80 which passes through a
flow control restriction 82 and control valve 84 to the steam
discharge nozzle. The boiler supplies steam for both the heat
exchanger and nozzle, but normally each drains power from the
boiler at different times. The restriction 82 can be of a fixed
size orifice that allows controlled steam discharge when the
control valve 84 is opened, and thus keeps the steam consumption
more uniform and not markedly beyond the boiler capacity for short
bursts.
For example, a preferred cycle provides that steam is discharged
into the cabinet for some 100 to 150 second duration, and at this
time the boiler pressure might be reduced from a designed 13 to 15
psi to approximately 10 psi. Thereafter, there would be an equally
long soak period with no steam discharge or blower operation, which
allows the steam to condense on and penetrate into the garment and
also provides recovery time for the boiler. Lastly, the blower is
powered to circulate heated air over the garment which fluffs and
dries the garment, and this phase of the cycle lasts typically some
120 to 180 seconds. The total finishing cycle takes between 5 and
10 minutes and requires a boiler having for example 11/2 to 21/2
boiler horsepower for a 6-10 garment capacity cabinet.
The restriction 82 can be of a fixed size orifice and permits long
steaming time with a given boiler capacity. Since it is
contemplated that the disclosed finisher can be operated where
steam is generated by an adjacent boiler, this feature is of
importance to reduce the cost of the installation.
Note that the disclosed heat exchanger 28 is set high on the
finisher thereby locating the condensate return connection 64 at a
minimum distance of approximately at least 4 inches above the water
level line on the adjacent boiler. This permits return of the
condensate under the forces of gravity and eliminates the need for
a condensate return pump. Moreover, the use of a low pressure
boiler with its pressure typically of the order of at least 10 psi
less than that of any available water system pressure permits water
makeup as indicated directly from the water system line. This
eliminates the need of a pump for forcing the makeup and condensate
water into the high boiler pressure; and it also eliminates the
need for a separate condensate collecting vessel.
The disclosed low pressure boiler and garment finisher combination
can be used in installations where high pressure steam is not
available or where it might even be prohibited by various safety
codes and the like, and is particularly suited for self service
coin-op installations. The quality of finish is comparable in most
respects to that obtained with conventional high pressure
finishers, but the lower overall cost and the fact that this
finisher system can be used in many previously heretofore
restricted installations clearly represent distinct advantages. The
disclosed finisher boiler combination is economical to install, and
is safe and efficient in operation.
For the sake of comparison, conventional finishing equipment
operates at steam pressures of approximately 55 to 125 psig, and
many garment finishing experts heretofore have considered 55 psig
as an absolute minimum pressure that could be used. It has been
found that in use finisher steam pressures might typically range
between 10 and 15 psi, where the 10 psi occurs during the steam
discharge and the higher pressure is reached during the soak period
or drying period.
The disclosed finisher can be constructed of sufficient material
gauges to allow operation at high steam pressure, it it were
available and or desired. For example, the finisher might be rated
for use at pressures up to 50 psig, and the same might be connected
to a higher pressure steam line. The schematic of this type
installation is shown in FIG. 2 where a typical remotely located
high pressure boiler 90 is used. In this, a pressure regulator 91
is in the steam line 92 to steam connection 60 operable to reduce
the boiler pressure to the accepted finisher pressure, and a water
trap 93 is in the condensate return line 94 from connection 64 and
line 95 from the trap empties into condensate tank 96. Line 97
connects the tank 96 through a pump 98 to the boiler 90, and a
float controlled water makeup is used but this time to the tank 96.
This system allows almost any relative location of the components,
since the boiler head is typically sufficient to drive both the
steam and the condensate, since the latter is vented to atmosphere
in tank 96. Water level control 100 determines the operation of the
makeup pump 98, and pressure controller 101 determines the
operation of the heating element 102 to the maximum steam pressure
while safety water overfill control 103 de-energizes the heater if
the water level in the boiler exceeded the safe level.
* * * * *