Modular self contained air conditioning unit

An air conditioning system. The system comprises an indoor section and an outdoor section arranged in side-by-side arrangement. The indoor section includes an indoor tangential fan having an axis aligned in a first direction, an indoor heat exchange coil, and a supply air aperture which longitudinally extends in the first direction and avoids line of sight noise transmission from the indoor fan. The system includes an axis commonly supporting and operably coupling the indoor fan and the motor, and a scroll housing within the indoor section and arranged about the indoor tangential fan. The indoor tangential fan, motor and axis are assembled to form a first module, the scroll housing forms a second module and the first module is independently removable from the second module without the necessity of disengaging any connection between the first and second modules. The system includes a fan support bracket supporting a first end of the axis, and the motor supporting a second end of the axis. The fan support bracket includes a bearing assembly rotatably supporting the axis and having a flange; a support bracket including a flange support matingly adapted to engage the flange, a clip adapted to engage a lower end of the bearing assembly support, and an axis aperture adapted to receive the first end of the axis. The system includes a module arranged about and supporting the indoor coil, and a horizontal guide allowing the coil and module to be removed in a horizontal direction.

BACKGROUND OF THE INVENTION 
The present invention is directed to a modular self contained air 
conditioning system such as a self contained unit ventilator or similar 
system having a blower or fan discharging air into a space to be 
conditioned. More particularly, the present invention is directed to a 
modular, serviceable and easily accessible fan assembly including a novel 
bearing support. 
A self contained unit ventilator is a typical packaged air conditioner in 
that it contains a complete air conditioning system including a serially 
linked indoor heat exchanger, compressor, outdoor heat exchanger, and an 
expansion device leading back to the indoor heat exchanger. The outdoor 
heat exchanger is in fluid communication with outdoor ambient air and, 
unless the unit ventilator is configured as a heat pump, acts as a 
condenser. The indoor heat exchanger is in fluid communication with the 
space to be conditioned and typically acts as an evaporator. The self 
contained unit ventilator is typically used in classroom or hotel 
applications and the incremental reduction of size in the unit ventilator 
provides significant competitive advantages. 
Typically the indoor and outdoor sections of the unit ventilator are 
separated from each other by a physical barrier, and each section includes 
a blower fan moving air through the respective indoor or outdoor heat 
exchanger. The blower or fan is preferably a cross flow tangential blower 
having a scroll housing about the blower where the blower discharge leads 
into a discharge/diffuser duct. The scroll housing radially expands about 
the blower and guides the blower discharge into that diffuser duct. A 
cutoff separates the blower input from the blower discharge. Often, the 
barrier runs the longitudinal length of the unit ventilator such that the 
outdoor section is behind and obstructed by the indoor section when viewed 
from the space being conditioned. The outdoor section can usually be 
serviced only by removing the indoor section to obtain access. 
Additionally, it is difficult to access and/or to remove the components 
for service or maintenance. 
For purposes of the present invention, the term blower and the term fan are 
used interchangeably and are intended to apply to all air moving devices. 
Additionally, this application is intended to apply to air conditioning 
systems and heat pump systems, those terms being used interchangeably 
unless otherwise indicated. 
SUMMARY OF THE INVENTION 
It is an object, feature and advantage of the present invention to solve 
the problems of the prior art unit ventilators. 
It is a further object, feature and advantage of the present invention to 
provide common access to all components of a unit ventilator from a single 
side. 
It is a further object, feature and advantage of the present invention to 
provide front access to all components of the unit ventilator. 
It is an object, feature and advantage of the present invention that the 
components be provided in modular assemblies such that each entire module 
can be removed for ease of serviceability and maintenance. 
It is an object, feature and advantage of the present invention that all 
components with moving parts or parts requiring maintenance or service be 
easily removable. 
It is an object, feature and advantage of the present invention to provide 
a unit ventilator which is energy efficient, quiet, cost effective to 
build, and designed with serviceability in mind. 
It is an object, feature and advantage of the present invention to provide 
a fan mounting arrangement which allows the bearings to be removed with 
the fan but without the necessity of dismantling the unit. 
It is a further object, feature and advantage of the present invention to 
avoid the requirement of access to the bearing mounting bolts or 
inter-raised locking collar when removing a blower. 
It is yet a further object, feature and advantage of the present invention 
to allow the use of standard, off-the-shelf bearing mounting flanges 
instead of custom tooled parts. 
It is an object, feature and advantage of the present invention to provide 
a self-contained air conditioner or heat pump having a single fan for an 
evaporator and a single fan for a condenser. 
It is a further object, feature and advantage of the present invention to 
access all components for service, maintenance, and cleaning from the 
front of the unit. 
It is yet a further object, feature and advantage of the present invention 
to provide quiet operation due to a single large fan operating at a low 
RPM. 
It is a further object, feature and advantage of the present invention to 
provide a more efficient fan and coil application due to larger available 
space for the fan housing and better airflow distribution through the heat 
exchange coils. 
The present invention provides a self-contained air conditioning unit. The 
unit comprises a housing; a heat exchanger within the housing; a 
tangential fan and a motor having a common axis, all within the housing 
and arranged to move air across the heat exchanger; and a scroll housing 
within the housing and arranged about the tangential fan. The tangential 
fan, motor and axis are assembled to form a first module and the scroll 
housing forms a second module. The first module is independently removable 
from the second modules without the necessity of disengaging any 
connection between the first and second modules. 
The present invention also provides a fan assembly. The fan assembly 
comprises a fan; a motor; an axis commonly supporting and operably 
coupling the fan and the motor; and a fan support bracket supporting a 
first end of the axis. The motor supports a second end of the axis. A 
scroll housing is arranged about the fan; and a base assembly supports the 
fan bracket and the motor. The base assembly is slideably separable as a 
unit from the scroll housing. 
The present invention further provides a blower support assembly. The 
assembly comprises a blower; an axis of the blower including a motor end 
and a fan end; a bearing assembly rotatably supporting the fan end of the 
axis; a bearing assembly support which supports the bearing assembly and 
includes a flange; and a support bracket. The support bracket includes a 
flange support matingly adapted to engage the flange, a clip adapted to 
engage a lower end of the bearing assembly support, and an axis aperture 
adapted to receive the fan end of the axis. 
The present invention still further provides an independently removable 
coil assembly. The coil assembly comprises a V-shaped heat exchange coil; 
a module arranged about and supporting the coil; and a horizontal guide 
allowing the coil and module to be removed in a horizontal direction. 
The present invention yet further provides a self-contained unit 
ventilator. The unit ventilator comprises an outdoor section and an indoor 
section arranged in a side-by-side arrangement. The indoor section 
includes return air, supply air and outside air apertures where all the 
apertures are longitudinally extended and parallel to each other in a 
first direction. The indoor section also includes a tangential fan 
arranged in the first direction, and a V-shaped heat exchange coil 
arranged between the fan and the return air and outside air apertures. The 
indoor section additionally includes a supply air duct located between the 
fan and the supply air aperture where the duct extends sidewise 
substantially the length of the fan and the length of the supply air 
aperture and has a depth distance between the fan and the supply air 
aperture that avoids line of sight noise transmission between the fan and 
the supply air aperture. 
The present invention additionally provides a packaged air conditioning 
system. The system comprises an indoor section and an outdoor section 
arranged in side-by-side arrangement. The indoor section includes an 
indoor tangential fan having an axis in a first direction, a V-shaped heat 
exchanger coil aligned in a second direction perpendicular to the first 
direction, and a supply air aperture which longitudinally extends in the 
first direction and avoids line of sight noise transmission from the 
indoor fan. The indoor fan moves air over the V-shaped coil and out the 
supply air aperture. The outdoor section includes a heat exchange coil, an 
outdoor tangential fan moving air over the heat exchange coil and having 
an axis running in the first direction, and a compressor. The indoor and 
outdoor tangential fans, and the V-shaped heat exchange coil are modularly 
arranged to be slideably removed in the second direction.

DETAILED DESCRIPTION OF THE DRAWINGS 
FIG. 1 shows a self contained air conditioning system 10 such as a unit 
ventilator. The system 10 includes a housing 12 surrounding an indoor 
section 14 and an outdoor section 16. A barrier 18 separates the indoor 
section 14 from the outdoor section 16. 
The housing 12 preferably contains an air conditioning system 20 including 
a compressor 22 where the compressor discharge is directed to an outdoor 
heat exchanger 24 typically acting as a condenser. The outside section 
includes a compressor section 19 and an air movement section 21 separated 
by a wall 23. The compressor 22 is located in the compressor section 19 
and the outdoor heat exchanger 24 is located in the air movement section 
21. The air movement section 21 includes an airflow path 26 entering from 
outside ambient air 28 through an outside air inlet aperture 30. The 
airflow path 26 passes through the outdoor heat exchanger 24 and returns 
to the outdoor ambient air 28 through an outside air outlet aperture 32. A 
blower 27 motivates the air along this airflow path 26 and out the outlet 
aperture 32. 
The air conditioning system 20 also includes one or more expansion devices 
34 such as an electronic expansion valve, a thermal expansion valve or the 
like. The expansion device 34 is connected to the discharge of the outside 
heat exchanger 24 and controls the flow of refrigerant to an indoor heat 
exchanger 36. The discharge of the indoor heat exchanger 36 returns to the 
compressor 22. The indoor heat exchanger 36 is located in the indoor 
section 14, and the expansion device 34 can be located in either the 
indoor or outdoor section 14, 16. If the air conditioning system 20 is a 
heat pump, a reversing valve (not shown) is provided to interchange and 
reverse the functions of the outdoor heat exchanger 24 and the indoor heat 
exchanger 36 within the serially linked air conditioning system 20. 
The indoor section 14 includes a blower 40 and motor 41 rotatable around a 
common axis 42 and aligned to draw air over the indoor heat exchanger 36. 
The indoor section 14 includes a return air inlet 44 bringing return air 
from the space 46 to be cooled, an outside air inlet 48 bringing in 
outside air from the ambient air 28, and a supply air discharge duct 54 
discharging conditioned supply air back through a discharge aperture 50 
into the space 46 to be conditioned. 
An airflow path 52 is provided from the return air inlet 44 and from the 
outside air outlet 48 to pass through the indoor heat exchangers 36, into 
the blower 40, through the discharge duct 54, and out the discharge 
aperture 50. A scroll housing is provided about the blower 40 to direct 
and control the blower's operation. A cutoff 58 and a diffuser section 60 
are provided to diffuse and direct the fan's discharge through the 
discharge duct 54 and the discharge aperture 50, and also to separate to 
blower intake from the blower discharge. Typically, the diffuser section 
60 is a planar section which angles away from a planar section 61 of the 
discharge duct 54, where the planar section 61 lies between the scroll 
housing 56 and the discharge aperture 50. 
The blower 40 and the diffuser section 60 are supported by an indoor 
assembly 62 which in turn is slideably mounted on the heat exchanger 
module 110 forming a part of the housing 12. Sidewalls 66 support the 
diffuser section 60, the cutoff 58, and the blower 40. The blower 40 is 
supported by motor 41 affixed to a projecting wall 67 of the sidewall 66 
at one end and by a bearing and support assembly 43 affixed to the 
sidewall 66 at the other end. The scroll housing 56 is not connected with 
the indoor fan assembly 62 such that the indoor fan assembly 62 can be 
slid out of the housing in the direction indicated by arrow 70 to remove 
the blower 40 but not removing the scroll housing 56. Dashed line 63 
indicates the preferred separation between the removable assembly 62 and 
the scroll housing 56 and its support walls 65. Since the scroll housing 
56 has no moving parts, little maintenance other than a cleaning is 
required. In contrast, the removal of the entire blower 40 including all 
its functioning parts such as its motor 41 allows easy serviceability. 
The housing 12 includes removable front panels 72 and 74 respectively 
covering the sections 16 and 14. These panels 72, 74 are of conventional 
design and allow access to the interior of the housing 12 once the panels 
72, 74 are removed. In the design of the present invention, all the major 
components are removable in direction 70, including all components with 
moving parts. 
FIG. 4 shows the blower 27, a blower support assembly 68, and a portion of 
a fan base support 75. The assembly 68 includes a bearing assembly support 
76 and a blower bracket 78. The axis 77 of the blower 27 includes a 
bearing assembly 80 conventionally mounted on the bearing assembly support 
76 by fasteners 82. The bearing assembly support 76 includes a flange 84 
and fastener apertures 86. The bracket 78 includes a flange support 90 
with mating apertures 92. The bracket 78 also includes an access aperture 
94 and a support clip 96. 
To complete the bearing assembly 68, the bearing assembly 76 is positioned 
on the bracket 78 such that the clip engages a lower end 98 of the bearing 
assembly support 76, and such that the flange 84 engages the flange 
support 90. The bearing assembly 80 and the fasteners 82 are located in 
the longitudinally oriented access aperture 94, and fasteners 100 are 
inserted to secure the flange 84 to the flange support 90 through the 
apertures 86 and 92. The fasteners 100 are accessible from above and, once 
the fasteners 100 are removed, the entire blower 27 and blower assembly 
support 76 can be lifted from the fan base support 75. No access to 
mounting bolts or inter-raised locking collars is required. The bracket 78 
is formed from standard off-the-shelf bearing mounting flanges instead of 
custom tooled parts. 
FIG. 5 illustrates how the indoor fan assembly 62 is removed. The front 
panel 74 is taken off, and several conventional fasteners (not shown) are 
removed. The fan assembly 62 then slides out of the housing 12 in 
direction 70 along the top of the module 110 to allow access to the blower 
40 and motor 41. 
As shown in FIG. 6, a similar arrangement is used to allow the blower 27 to 
be removed from the housing 16. To service the blower 27 or its motor 120, 
the panel 72 is removed and then a portion 23a of the wall 23 is removed. 
This allows a space 122 above the motor 120 and the blower 27 to be 
accessed such that several conventional fasteners holding the motor 120 in 
place can be removed and the motor 120 decoupled from the blower 27. The 
motor 120 can then be removed for service by first lifting the motor 120 
up and then out in direction 70. Although the blower's distal end 124 is 
not directly accessible, the distal end 124 is mounted by the blower 
support assembly 68 which only requires the removal of the two fasteners 
100 to release the distal end 124 of the blower 27. The blower 27 has a 
scroll housing 130 arranged about it but without positive connections 
between the blower 27 and the scroll housing 130 such that the blower can 
be removed independently of the scroll housing 130. The blower 27 then can 
be moved into the space vacated by the motor 120, lifted up and moved 
forward in direction 70 for service. However, typically, the blower 27 
needs little service. Reassembly is a reversal of the disassembly steps. 
Similarly with regard to FIG. 7, the indoor heat exchanger 36 is within and 
supported by the heat exchanger module 110 including sides 112 and a base 
113. After decircuiting the heat exchanger 36, the module 110 is slideable 
along support rails 116 to allow removal of the entire module 110 in the 
direction 70. The indoor heat exchanger 36 can then be easily serviced. 
The indoor fan assembly 62 rests directly on the module 110 and is 
preferably held in place with several screws. To service the blower 40, 
the panel 74 is removed and the screws are removed. The indoor fan 
assembly 62 is then slid out in direction 70 allowing easy access to the 
blower 40 and the motor 41. Likewise, to service the module 110, the 
indoor fan assembly 62 must first be removed. Then, several fasteners such 
as screws are removed and the entire module 110 is removed in direction 
70. Reassembly is a reversal of the disassembly steps. 
The present invention provides an air conditioning system such as a unit 
ventilator which is serviceable from a single side including a modular 
arrangement that allows all moving parts to be removed. It will be 
apparent to a person of ordinary skill in art that many variations in this 
arrangement are contemplated. All such variations and modifications are 
within the spirit and scope of the claimed invention. 
What is desired to be secured for Letters Patent of the United States is 
set forth in the following claims.