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Патент USA US2408973

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Oct. 8, 1946.
A. H. EBERHART
2,408,972
AIR CONDITIONING APPARATUS
Filed Dec. 6, 1944
2 Sheets-Sheet 1
26
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INVENTOR
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_
A, H, EBERH-ART
'
AIR
7
2,408,972
CONDITIONING APPARATUS
'
Filed Dec. 6, 1944
2 Sheets-Sheet 2
:1
INVENTOR '
! HRTHUR H. EBERHFI RT.
55 BY 7?‘ / Wyh
-
ATTORNE‘Y-
I
2,408,972
Patented Oct. 8, 1946
UNITED STATES PATENT OFFICE
2,408,972
AIR CONDITIONING APPARATUS
Arthur H. Eberhart, Spring?eld, Mass, assignor
to Westinghouse Electric Corporation, East
Pittsburgh, Pa., a. corporation of Pennsylvania
Application December 6, 1944, Serial No. 566,797
5 Claims. (01. 62-129)
1
My invention relates to an air conditioning
unit of'the type adapted to be mounted on the
window sill of a room.
One object of my invention is to produce an
improved unit of the type set forth,
Another object of my invention is to produce
2
rear ?anges 34 and 36. A removable decorative
cover including a top wall 38, side walls 48 and 42,
and front and rear walls 44 and 46, coacts with
the tray to form a casing completely enclosing
the refrigerating apparatus.
The casing is di
vided transversely by a partition 48 to form an
outer compartment extending into, or in the
an improved air conditioning unit which is capa
direction of, the outside atmosphere, and an inner
ble of being readily adjusted to condition and
compartment
extending into, or in the direction
recirculate room air only, to introduce condi
tioned outside air only to the room, to condition 10 of, a room the air of which is to be conditioned.
The partition 48 extends upwardly from the bot
a mixture of outside air and room air and deliver
tom wall 28 of the tray to Within a short distance
the conditioned mixture to the room, or to ex
of the top wall 38 of the decorative cover. As
haust air from the room to the outside atmos
will be seen from Fig, 1, the outer compartment
phere.
Another object of my invention is to produce 15 houses the compressor, the condenser, the motor
M and the condenser fan 22. The inner com
an air conditioning unit which can be adjusted
partment houses the evaporator, the fan 24 and
to effect the various air ?ows above set forth by
other parts which will be later described. The
the manipulation or setting of a single readily
inner compartment is also provided with a-top
accessible control knob or handle.
Another object of my invention is to produce 20 wall 50, which coacts with the top wall 38 of the
decorative cover to form a passage 52, and a front
an inexpensive construction for attaining the
wall
56 which coacts with the front wall 44 of
foregoing objects.
the decorative cover to form a passage 56. The
These and other objects are effected by my in
passage 52 and. passage 56 communicate with the
vention as will be apparent from the following
room through an inlet 58. The outer end of
25
description and claims taken in connection with
the passage 52 communicates with the top of the
the accompanying drawings, forming a part of
outer compartment, as clearly shown in Figs. 3
this application, in which:
Fig. 1 is a diagrammatic view, partly in top
plan and partly in horizontal section, of an air
conditioning unit embodying my invention;
Fig. 2 is a vertical section of the unit shown
in Fig. 1, the view being approximately on line
II-II of Fig. 1; and
Figs. 3, 4 and 5 are diagrammatic views illus
trating three positions of the dampers for con~
trolling the air flow through the unit.
'
In Figs. 1 and 2 of the drawings, I illustrate
a refrigeration system including an evaporator
it, a compressor I2 and a condenser 14.
The
liquid refrigerant flows from the condenser to the
evaporator through a pipe it of small diameter
and the evaporated refrigerant is sucked from
the evaporator by the compressor through a pipe
it. The compressed refrigerant gas flows through
a pipe 29 to the condenser where it is cooled,
lique?ed and returned to the evaporator in the
to 5.
'
-
The side wall 42 of the decorative cover adja
cent the blower 22 is provided with an'outside air
inlet 60 through which the condenser fan22,
under certain conditions of operation, draws out
side air for cooling the refrigerant gas flowing
through the condenser. The condenser fan is
adapted simultaneously to draw outside air
through an opening 62 in registration with the
compressor 50 that ‘the air drawn through the
opening 52 serves to cool the compressor. Under
other conditions of operation, the condenser fan
is also adapted to draw air from the room. The
air moved by the condenser fan 22, be it drawn
through either or both of the. openings 60 and
62, or from the room in a manner hereinafter
explained, is blown over the condenser and is
discharged to the outside atmosphere through an
outlet 64.
The evaporator fan 24 is provided with a spiral
well-known manner. A motor M drives a con
shroud 66, the discharge end of which leads to
denser fan 22 for blowing air over the condenser,
the bottom of the evaporator, as best shown in
and an evaporator fan 24 for blowing air over the
50 Fig. 2. The air blown over the evaporator is dis
evaporator.
I
charged to the room through an outlet 88 which
The refrigerating system above described is
is preferablyprovided with a grille ‘H3. The front
mounted on or in a tray which may be secured
Wall 54 of the inner compartment is provided with
directly to the sill 26 of a window, or to other
a fan inlet 12 communicating with the passage
supporting means forming part of, or carried by
the window structure. The tray includes a bot- 55 56 through a suitable ?lter ‘l4.
In order to direct and regulate the ‘flow 'of air
tom wall 23, side ?anges 30 and 32, and front and
2,408,972
3
4
conditioned by the unit thus far described, I
provide a damper ‘I5 for controlling the inlet 58,
treme right-hand position, and in Fig. 5, the arm
is shown in its extreme left-hand position, it will
be understood that intermediate adjustments of
a damper ‘I8 for controlling the passage 52, and
a damper 80 for controlling the outside air inlet
the arm can be effected by appropriate rotation
80. Also, I so construct and arrange the dampers
of the knob 84.
and their adjuncts that they are all adjusted to
For example, in the intermediate position of
the desired position by a simple movement of a
the arm 94 illustrated in Fig. 3, the dampers ‘I6
single, readily accessible control knob 84. As
and 80 are partly open, the chain I I2 is slack and
shown, the damper ‘I8 is hinged to a suitable sup
the damper ‘I8 is closed by the spring 92.
port 88 and is biased to a position Opening the
Operation
inlet 58 by a spring 88. The damper ‘I8 is hinged
to a suitable support 90 and is biased to a posi
When it is desired to condition and recirculate
tion closing the passage 52 by a spring 92.
room air only, the knob 84 is rotated to a posi
In order to move the dampers ‘I6 and ‘I8 against
tion indicated on an index plate, not shown, to
the action of their respective springs, and in order 15 adjust the parts as shown in Fig. 3. In this posi—
simultaneously to regulate the position of the
tion, the evaporator fan 24 draws room air
damper 80, I provide an actuating arm 94 which
through the inlet 58 and ?lter ‘I4, passes the air
includes a horizontal portion 90 and a pendant
over the evaporator and discharges it into the
vertical portion 98. The horizontal portion 98
room through the grille ‘I0. Also, in this posi
extends through guide slots I80 formed in the
tion, thedamper 80 is in partly open position
front and rear walls of the inner compartment,
and the condenser fan 22 draws outside air
and the vertical portion 98 extends downwardly
through the openings 60 and 82 and discharges
through the passage 55. The actuating arm is
it over the condenser and through the outlet 64.
connected to one end of a chain or other ?exible
The path of flow of the air is indicated by the
element I02, the other end of which is secured to
arrows in Figs. 1 and 3.
a pulley I04 on a shaft I06 rotatable by the knob
When it is desired to introduce conditioned,
84. The outer end of the horizontal portion of
outside air only into the room, the knob 84 is
the actuating arm is connected by a, pivoted link
rotated to another indicated position to adjust
I08 to the damper 80. The actuating arm as a
the parts as shown in Fig. 4, in which the damper
whole is biased to the right as viewed in Figs. 30 ‘I6 is in a position fully closing the inlet 58, the
3 to 5, by a spring I I 0. The lower end of the ver
damper ‘I8 is in a position in which the passage
tical portion 98 of the actuating arm abuts against
52 is unobstructed and, the damper 80 is in full
the damper ‘I6 in all positions of said arm. The
open position. The evaporator fan 24 now draws
shaft I06 is provided with one ‘or more friction
outside air through the opening 80, the passage
washers, not shown, for retaining the shaft in any 35 52 and the ?lter ‘I4, passes it over the evaporator
position to which it is adjusted.
and discharges it into the room. The full open
The-horizontal portion 96 of the actuating arm
ing of the damper 80 permits admission of enough
is also connected to one end of a chain or other
air to satisfy the requirements of both the con
?exible element II2 which passes between guide
denser fan 22 and the evaporator fan 24. The
rolls I I4 and the other end of which is connected
path of ?ow of the air is indicated by the arrows
to one end of a lever IIG, the other end of which
in Fig. 4.
is secured to the damper ‘I8.
A mixture of room air and outside air, in vari
By turning the knob 84 so as to rotate the shaft
ous proportions, for conditioning, may be ob
I 06 in counterclockwise direction, as viewed in
tained by rotating the knob 84 to bring the arm
Figs. 3 to 5, the chain I02 is partly wound upon 45 94 to a suitable position intermediate the posi
the pulley I04 and .the arm 94 is thus pulled to
tions shown in Figs. 3 and 4. Upon moving the
the left, against the action of the spring I I0, The
arm 94 to the left from the position shown in
vertical portion 98 of the arm is now somewhat
Fig. 3, the damper ‘I8 gradually opens, to pro
retracted from the damper ‘I6 and permits the
vide an increasing amount of outside air, and the
spring 88 to open the damper ‘I6 to a correspond 50 damper ‘I8 gradually closes, to reduce the amount
ing extent, as shown in Fig. 3.
of room air and to transfer the suction effect of
Further rotation of the shaft I05 in counter
the evaporator fan 24 to induce the ?ow of out
clockwise direction, further winds the chain I02
side air through the passage 52 past the damper
on the pulley I04. This moves the arm 84 still
‘I8. When the position of Fig. 4 is reached, the
further to the left and further retracts the ver 55 admission of room air has been reduced substan
tical portion 88 thereof so that the spring 88
tially to zero and the outside air has been in
moves the damper 16 to its fully open position,
creased substantially to 100 per cent.
as shown in Fig. 5.
When it is desired to exhaust air from the
By turning the knob 84 so as to rotate the shaft
room, the control knob 84 is rotated to still an
I06 in clockwise direction, the chain I02 is un 60 other indicated position, to bring the parts to
wound from the pulley I04, thus permitting the
spring I I0 to move the arm 94 to the right. The
spring IIO being stronger than the spring 88, the
the position shown in Fig. 5 in which the dampers
‘I6 and 18 are moved to full open position.
It will
be noted that, in this position of the actuating
vertical portion 98 of the arm moves the damper
arm, the damper 80 is in its maximum closing
‘I5 in a direction to close the inlet 58.
65 position. Therefore, in order to satisfy the re
The movement of the arm 94is transmitted to
quirements of the condenser fan 22, air is drawn
the damper ‘I8 through the chain H2 and to the
from the room, through the inlet 58 and passages
damper 80 through the link I08. Thus, if the arm
56 and 52, as well as from the outside atmosphere
94 is moved su?iciently to the right, the dampers
through the inlet 62. The path of flow of the
‘I8 and 80 are moved to their respective fully
air is partly indicated by the arrows in Fig. 5.
open positions, as shown in Fig. 4. If the arm 94
If desired, the rod 94 may be omitted and the
is moved su?iciently to the left, the damper ‘I8
shaft I06 may be provided with separate pulleys
is opened and the damper 80 is closed, as shown
which will be connected to the dampers ‘I6, ‘I0
in Fig. 5.
.
While in Fig. 4 the arm 84 is shown in its ex
and 80 by chains or other ?exible elements in a
75 manner such as that illustrated in my prior Pat
2,408,972
6
ent No. 2,343,122‘ of February 29, 1944. Also, if
desired, the damper 80 may be mounted for slid
ing movement against the side wall 42 instead of
the pivoted mounting of the damper illustrated.
While I have shown my invention in but one
form, it will be obvious to those skilled in the art
that it is not so limited, but is susceptible of vari
ous changes and modi?cations without departing
from the spirit thereof.
What I claim is:
1. In a room air conditioning unit, a casing
having a ?rst portion and a second portion, a
?rst heat exchanger in said ?rst portion, a second
heat exchanger in said second portion, an outside
air inlet for admitting air from the outside at
mosphere to said ?rst portion, an air outlet lead
ing from said ?rst portion to the outside atmos
phere, a fan for drawing outside air through said
outside air inlet into contact with said ?rst heat
exchanger and discharging it through said outlet
to the outside atmosphere, a room air inlet for ad
mitting air from a room the air of which is to be
conditioned to said second portion, a room air
outlet leading from said second portion for dis
means biasing said damper to a position in which
said room air inlet is open, a second damper for
controlling said passage, means biasing said
second damper to a position in which said pas
sage is closed, an actuating member adapted
simultaneously to position both of said dampers,
and means biasing said member to a position in
which said first damper is moved to a position
closing said room air inlet and said second
10 damper is moved to a position in which said
passage is open.
_
3. The structure recited in claim 2 together
with a third damper for controlling said out
side air inlet, and means connecting said third
damper to said actuating member, said means
being so constructed and arranged that said
third damper is moved to a position partly or
wholly closing said outside air inlet according
to the position of said member and in predeter
mined relation to the position of said ?rst and
second dampers.
4. The structure recited in claim 2 in which
said actuating member is movable to three dif
ferent positions and in which said dampers and
said member are so constructed and arranged
charging air to said room, a fan for drawing room 25 that in one position of said member said ?rst
air through said room air inlet into contact with
damper is partly open and said second damper
said second heat exchanger and discharging it
is fully closed, and in a second position of said
through said room air outlet back into the room,
member said ?rst damper is fully closed and said
a passage connecting said room air inlet with
second damper is fully open, and in a third posi
said outside air inlet and said outside air outlet, 30 tion of said member said ?rst and said second
and means for regulating the flow of outside air
dampers are open.
or room air into contact with either of said heat
5. In a room air conditioning unit, a casing
exchangers and into the room or to the outside
having a ?rst compartment and a second com
atmosphere, comprising a ?rst damper for con
35 partment, a ?rst heat exchanger in said ?rst
trolling said outside air inlet, a second damper
compartment, a second heat exchanger in said
for controlling said passage, and a third damper
second compartment, an outside air inlet for
for controlling said room air inlet, and actuating
admitting air from the outside atmosphere to
means for positioning said dampers, said actuat
said ?rst compartment, an air outlet leading
ing means and said dampers being so constructed 40 from said ?rst compartment for discharging air
to the outside atmosphere, a room air inlet for
and arranged that, in one position thereof said
admitting air from a room to said second com
inlets are open and said passage is closed, where
partment, there being a discharge opening lead
by outside air is circulated around said ?rst heat
ing from said second compartment for discharg
exchanger and room air isv circulated around said
second heat exchanger, in a second position of 45 ing air back to said room, a ?rst fan for draw
ing air through said outside air inlet into con
said actuating means and said dampers said room
tact with said ?rst heat exchanger and dis
air inlet and said passage are open and said out
charging it through said outlet, a second fan
side air inlet is at least partly closed, whereby
far drawing room air through said room air inlet
room air is withdrawn through said room air in
into contact with said second heat exchanger
let and said passage and discharged to the at
and discharging it back into the room through
mosphere, and, in a third position of said damp
said discharge opening, a wall structure de?n
ers and said actuating means, said outside air
ing a passage connecting said compartments,
inlet and said passage are open and said room air
and means for controlling the ?ow of outside air
inlet is at least partly closed, whereby outside air
is drawn through said outside air inlet and said 55 and room air into and through one or both of
said compartments and through said passage,
passage into contact with said second heat ex
said means including a ?rst damper for con
changer and is discharged into said room.
trolling said passage, a second damper for, con
2. An air conditioning unit comprising a cas
ing, means dividing said casing into an inner
trolling said room air inlet, a member movable
compartment and an outer compartment, re 60 through a range of movement from a ?rst posi
tion to a second position and effecting move
frigerant liquefying means disposed in said outer
ment of said second damper from full open to
compartment, refrigerant evaporating means
full closed position upon movement from its
disposed in said inner compartment and con
?rst to its second position, said member and
nected in refrigerant flow relation to said re
frigerant liquefying means, means providing a 65 said ?rst damper being interconnected so that,
when said member is in an intermediate position
passage connecting said compartments, there be
between said ?rst position and said second posi
ing an outside air inlet leading to said outer
tion and said second damper is partly open, said
compartment, an air outlet leading from said
?rst damper is closed and so that, as said mem
outer compartment to the outside atmosphere,
at room air inlet leading from a room, the air 70 ber is moved from said intermediate position
to either said ?rst position or said second posi
of which is to be conditioned, to said inner com
tion, said ?rst damper is moved to open posi
partment, and a conditioned air outlet leading
tion.
from said inner compartment to said room, a
?rst damper for controlling said room air inlet,~
ARTHUR H. EBERHART.
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