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Патент USA US2083780

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June 15, 1937.
'
w. |-|_ GlLLE
"2,083,780
CONTROL SYSTEM
Filed Sept. 24, 1934
35
HUMIDITY
RESPONSIVE
‘ VARIABLE
‘I: RESISTANCE
Jwuemtcw
Willis H Gille
35%
7"
Patented June 15, 1937
2,083,780
UNITED STATES
PATENT . OFFICE . ‘
» 2,083,780
CONTROL SYSTEM
Willis H. Gille, St. Paul, Minn.,' assignor to Min
neapolis-Honeywell Regulator Company, Min
neapolls, Minn, a corporation of Delaware
Application September 24, 1934, Serial No. 745,374
6 Claims.
This invention relates to control mechanisms
in which small and delicate changes in a condi
tion are ampli?ed to operate devices requiring
a relatively stronger force and has particular
5 utility in humidity control devices wherein the
changes in the condition are small and delicate
and not su?icient to operate the humidity con
trol device directly.
,
soldered to a contact arm l6. Line wire Ill ex
tends directly to the double solenoid. The C011?
tact arm I6 is adapted tov selectively engage a
contact I‘! or a contact l8 which contacts are
connected by wires I9 and 20 respectively to the
double solenoid l2.
.
I
5
-
When the contact arm it engages the contact
H, the double solenoid I2 is energized to close
,
An object of this invention is to provide a
10 more sensitive control mechanism wherein small
and delicate changes in a condition acting there
on which are insu?icient to operate a control de
vice directly are ampli?ed to operate said control
device.
15
(0!. 236-44) '
} .
Another objectof this invention is to provide
the valve H and when the contact arm 06 en
gages the contact l8, the double solenoid i2 is 10
energized to, open the valve it.
The contact arm I6 is operated by a double
heat responsive device which consists of a bi
metallic arm 24 secured at one end to a support
25 and a second bimetallic arm 22 secured at one 15
a control mechanism wherein an o? and on con
end thereof to the other end of the first bimetal
trol is provided at the command of a small change lic arm 24 by means of a pin 23. The lower end
in resistance of an active element of the variable _ of the bimetallic arm 22 is connected to the con
resistance type.
tact arm it. As the bimetallic element 28 is
20
A further object is to provide a control mecha- ' heated, it being secured to the support 25, the 26,
nism wherein voltage changes and ambient tem
perature changes are compensated to nullify their
effect.
c
A still further object is to provide a control
25 mechanism wherein the Control point may be
adjusted from a remote position.
.
More speci?cally, another object is to provide
a humidity control system wherein small and
delicate changes in resistance of a humidity re
30 sponsive variable resistance are ampli?ed to pro
vide an oif and on control for a mechanism to
control the humidity.
-
Other objects and advantages will become ap
parent to those skilledin the art by reference to
35 the accompanying speci?cation and drawing in
which there is shown a diagrammatic view of my
control system, preferably applied to a humidity
control.
'
The control system is of general utility and
~10 may be- used in connection with practically any
system and may be responsive to practically any
condition but for purposes of illustration and not
for limitation it is shown as applied to a humidity
control wherein Hi’is a water pipe delivering a
45 spray vof water to the space, the humidity of
which is to be controlled. Located in the pipe
i0 is an open and shut valvel l operated from
full open position to full closed position and- vice
versa by a double solenoid which valve and sole
50 noid may take the form disclosedin the patent
element will bend or ?ex in a counter-clockwise
direction thereby tending to move the contact
arm I 6 towards the contact it. When the bi
metallic element 22,. being secured at its upper’
end to the pin 23, is heated, it bends or ?exes 25
in a clockwise direction, tending to move the
contact arm it towards the contact ll.
It will
be noted at this point that theelements 22 and
213 when heated operatein opposite directions
so that ambient changes in temperature‘ of the 30 _
surrounding atmosphere have no effect upon this
portion of the instrument.
The bimetallic heat responsive element 22 is
heated by a heating element 21 while the bime
tallic heat responsive element 24 is heated by a 35
heating element 28. These heating elements 21
and 28 obtain their energy from line wires 30
and 3| connected to theprimary~33 of a step’
down transformer 32. The secondary 34 of the
transformer 32 is connected by means of a wire 40
35 to, one end of the heating element 28. The
other end of the heating element 28 is connected
by a wire 36 to an adjustable contact 31 oper
ating on and contacting'a resistance coil 38. This
resistance coil 38 is connected by a wit-e39 to'a 46
wire 40 ‘which in turn is connected to the other
side of the secondary 34.
,
43 designates a variable resistance that may be .
of. any. type and which may be responsive to
changes in any condition, preferably changes in 50
to George D. Bower No. 1,861,046, ?led May 24th,
relative humidity,‘ audit is herein shown as a
1928, and patentedMay-Blst, 1932.
The energyfor operating the double solenoid
humidity responsive variable resistance-of the
type shown and described in the patent to-W. R.
__ l2 is-obtained from line wires l3 and Ill, line
I Starkins N0. 1,694,107 ?led March 24th, 1926'and
.'
_
D” wire it being made ?exible as at it and being
patented December 4th, 1928.
Such a variable 55
2
2,088,780
resistance consists of a wire 4| and a wire 42
each wire being insulated by cotton and wrapped
closely together in the form of a coil. One wire
4i is connected to the wire“ which in turn is
connected to the secondary v34 of ‘transformer 32.
The other wire 42 of the variable resistance is
connected by a wire 44 to one end oi.’ the heating
element 21 while the other end of the heating
element 21 is connectedv by a wire 43 to that
end of heating element 23 which is connected to
the wire 35.
_
'
The resistance 43 is varied by moisture perme
ating the cotton insulation of the wires 4| and
42 so that greater moisture lowers‘ the resistance
between wires 4| and 42' and less moisture in
creases the resistance therebetween the amount
of resistance varying exponentially with respect
to the vapor content or relative humidity of the
atmosphere in which .the device“ is placed.
-20
The circuit for operating the heat responsive
element 24 is completed through the secondary
34 of the transformer 32, wire 3_5,heating element
23, wire 33, adjustable contact 31, resistance coil
33.wire32 and'wire 44.
-
I
_
_
-
The circuit for operating the heat responsive
element 22 is completed through secondary 34,
the heat responsive element 22 which causes con
tact arm I‘ to engage contact l1 totenergise the
double solenoid i2 to close the valve ii to de
crease the amount of water vapor in the air
and bring the parts back to equilibrimn again
as shown in the drawing.
From the above, it is seen that I have provided
a 'more sensitive‘ control mechanism wherein
small and delicate changes in conditions acting
thereon which are-insu?icient to operates con
trol device directly are ampli?ed to operate said
control device.
"
while one embodiment oi this invention has
been shown and described, it is obvious that many
modi?cations may be apparent to one skilled in 15
the art and consequently, this invention is to be
limited only by the scope of the appended claims.
I claim:
‘.
I
1'. In a control
of the characterv de
scribed, a variable resistance , responsive to 20
changes in humidity, a solenoid operated valve
mechanism tocontrol the‘, humidity, an oil and
on switching mechanism, a circuit connecting
said on’ and on switching ‘mechanism and said
solenoid operatedvalve mechanism to open and
close said valve mechanism in response to said
wire 3!, wire 45, heating element 21, wire 44, con- ' switching mechanism, means to operate said
duction through the insulating means between
wires 4i and 42 of the variable resistance 43, and
the wire 43.
‘
I
‘
The adjustable resistance '33 determines the
amount of heat given oiI by the heating element
23 and may be located at a point remote from the
rest of the structure. -By increasing the resist
ii ance 34, the amount of heat given of! by the heat
ing element 22 is reduced and by decreasing the
switching mechanism according to changes in
resistance in said humidity responsive variable
resistance comprising 'a heat responsive element 30
secured at one end and acting in one direction,
a second heat responsive element secured at one
end to the other end 0! said ?rst heat responsive
element and at the other end to said switching
mechanism and acting in the opposite direction 35
whereby ambient temperature changes are com
pensated, a sourcev 01' energy, a heating element
controlling said ?rst heat responsive element, a
resistance 34, the amount of heat given oil by
the heating element 23 is increased. For a given
setting of the resistance 33, the heat given 012 by ' circuit connecting said source and‘said heating
element to constantly urge said switching mecha 40
40 the heating element 23 will be substantially con
stant except for slight changes in line voltage nism in one direction, a second heating element
thereby urging the contact arm it towards the controlling said second heat responsive element
contact I. with a substantially constant force.
The heat given o?f by the heating element 21
45 is inversely proportional, in an exponential man
ner, to the amount of resistance in the resistance
43. As the humidity increases, the resistance of
the variable resistance 43 decreases and permits
heating element 21 to give of! more heat to the
heat responsive element 22 to tend to urge the
contact arm ii towards the contact l1.
Due to the fact ‘that the heating elements 21
and 23 ‘cause the heat responsive elements 22 and
and a second circuit connecting said source, said
humidity responsive variable resistance and said
second heating element to urge said switching 45
mechanism in the other directionvaccording to
changes in humidity acting on said variable re
sistance whereby both of said heating elements
are arranged to compensate for voltage changes
in said source and an adiustablefresistance in
said ?rst circuit to adjust the heating e?ect oi
said ?rst heating element to make said control
system responsive to greater or less conditions
24 respectively to operate in opposite directions,
of humidity.
and since both heating elements 21 and 23 receive
2. In a control system of the character de 55
scribed, a variable resistance responsive to
changes in humidity, a solenoid operated valve
mechanism to control the humidity, an o? and on
switching mechanism, a circuit connecting said
oil! and on switching mechanism and said sole
noid operated valve mechanism to open and
close said valve mechanism in response to said
switching mechanism and means to operate said
switching mechanism according to changes in re
their energy from a common source, the lines 33
and 3i, any ?uctuations in the line voltage are
compensated and nulli?ed.
Assume that the parts are in equilibrium and
60 are in the position shown in the drawing, heating
element 23 tends to urge the contact arm it
towards the contact .i3 and heating element 21
tends to urge the contact am It towards the
contact i1. when the humidity decreases, the
resistance in the variable resistance 43 increases
and causes the heat given o? by the heating
element 21 to decrease whereby the contact arm
it will engage the contact i3 to energize the
double solenoid i2 to open the valve which sup
plies more water to the atmosphere and brings
the humidity up to normal and allows the parts
to resume their equilibrium positions as shown in
the drawing. Assume that the humidity in
creases, the resistance 43 decreases, allowing the
75 heating element 21 to develop more heat to ?ex
_
sistance in said humidity responsive variable re,
sistance comprising a heat responsive element
secured at one end and acting in one direction. a
second heat responsive element secured at one
end to the other end of said ?rst heat responsive
element and at the‘ other end to said switching 70
mechanism and acting in the opposite direction
whereby ambient temperature changes are com~
pensated, a source of energy, a heating element
controlling said ?rst heat responsive element, a
circuit connecting said source and said heating 75
3
2,088,780
element to constantly urge said switching mech
anism in one direction, a second heating ele
end or said ?rst heat responsive element and
at the other end to said switching mechanism and
ment controlling said second heat responsive ele
acting in the opposite direction whereby ambient
ment and a second circuit connecting said source,
5 said humidity responsive variable resistance and
said second heating element to urge said switch
temperature changes are compensated, a source
of energy, a heating element controlling said
?rst heat responsive element, a circuit connect
ing said source and said heating element to con
stantly urge said switching mechanism in one
ing mechanism in the other direction according
to changes in humidity acting on said variable
resistance whereby b/oth oi’ said heating elements
.10 are arranged to compensate for voltage changes
in said source.
3. In a control system, a variable resistance
responsive to changes in a condition, an electri
cally operated control mechanism to control said
15 condition, an off and on switching mechanism,
a circuit connecting said switching mechanism
and said electrically operated control mechanism
to operate said control mechanism in response
to said switching mechanism, means to operate
20 said switching mechanism according to changes
01' resistance in said variable resistance compris
ing a heat responsive element secured at one end
and acting in one direction, a second heat re
sponsive element secured at one end to the other
25 end oi’ said ?rst heat responsive element and at
the other end to said switching mechanism and
acting in the opposite direction whereby ambient
temperature changes are compensated, a source
of energy, a heating element controlling said ?rst
30 heat responsive element, a circuit connecting
said source and said heating element to con
stantly urge said vswitching mechanism in one
direction, a second heating element controlling
said second heat responsive element and a sec
35 ond circuit connecting said source, said second
heating element and said variable resistance to
urge said switching mechanism in the other di
rection according to changes in the condition
acting on said variable resistance whereby both
of said heating elements are arranged to com
pensate ior voltage changes in said source and an
adjustable resistance in said ?rst circuit to ad
just the heating e?'ect of said ?rst heating ele
ment to make said control system responsive to
greater or less changes in the condition.
4. In a control system, a variable resistance
responsive to changes in a condition, an electri
cally operated control mechanism to control said
condition, an oil and on switching mechanism,
50 a circuit connecting said switching mechanism
and said electrically operated control mechanism
to operate said control mechanism in response to
said switching mechanism, and means to operate
said switching mechanism according to changes or resistance in said variable resistance compris
ing a heat responsive element secured at one end
and acting in one direction, a second heat re
sponsive element secured at one end to the other
direction, a second heating element controlling
said second heat responsive element and a sec
10
ond circuit connecting said source, said second
heating element and said variable resistance to
urge said switching mechanism in the other
direction according to changes in the condition
acting on said variable resistance whereby both 15
of said heating elements are arranged to com
pensate for voltage changes.
5. In a control system, the combination of, a
variable resistance responsive to changes in a
condition, a mechanism to be operated, means to 20
operate saidxmechanism according to changes of
resistance in said variable resistance comprising
a heat responsive element secured at one end and
acting in one direction, a second heat responsive
element secured at one end to the other end of 25
said ?rst heat responsive element and at the
other end to said mechanism and acting in the
opposite direction whereby ambient temperatures
are compensated, a source 01' energy, a heating
element controlling said ?rst heat responsive ele 30
ment, a heating element controlling said second
heat responsive element, and connections be
tween said source, said variable resistance and‘
said heating elements whereby said mechanism
is moved in accordance with changes in the con 35
dition varying the resistance.
6. In a control system, the combination of, a
variable resistance, a mechanism to be operated,
means to operate said mechanism according to
changes of resistance in said variable resistance 40
comprising a heat responsive element secured at
one end and acting in one direction, a' second
heat responsive element secured at one end to the
other end 01' said ?rst heat responsive element
and at the other end to said mechanism 46
and acting in the opposite direction whereby
ambient temperatures are compensated, a source
oi.’ energy, a heating element controlling said
?rst heat responsive element, a circuit connect
ing said source and said heating element to urge 60
said mechanism in one direction, a second heat
ing element controlling said second heat respon
sive element, and a second circuit connecting
said source, said second heating element and said
variable resistance to urge said mechanism in 55
the other direction according to changes in re
sistance of said variable resistance.
\
,
WILLIS H. GIILE.
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