Air cooled two stage condenser for air conditioning and refrigeration system

An air cooled two stage condenser constructure for air conditioning and refrigeration system which including a casing define a first chamber and a second chamber, each chamber having a respective air intake port and a respective exhaust port, a refrigerant circulation tubing installed in the casing divided into two sections with connection, one is for condenser and other is for heat exchange, a compressor mounted inside the casing and controlled to pump the refrigerant, a fan motor mounted inside the casing, a fan blade installed in the first chamber and rotated by the fan motor to cause currents of air through heat exchanger coil toward the first exhaust port, and a wind wheel installed in the casing and rotated by the fan motor to suck currents of air from the first air intake port of the second chamber through the condenser coil toward the second exhaust port of the first chamber.

BACKGROUND OF THE INVENTION 
The present invention relates to an air cooled two stage condenser 
construction for air conditioning and refrigeration system. 
Regularly, air conditioning/refrigeration include two types, namely, the 
air cooled type and the water chilled type. Because the heat dissipation 
effect of an air cooled type air conditioning/refrigeration tends to be 
affected by the surrounding environment, the cooling effect of an air 
cooled type air conditioning/refrigeration is less efficient. A water 
chilled type air conditioning/refrigeration provides a relatively better 
cooling effect because it uses cold water to make a heat exchange with the 
refrigerant. However, the installation cost of water cooled type air 
conditioning/refrigeration is high. For cost's sake, air cooled type air 
conditioning/refrigeration is more popularly accepted. FIG. 1 shows an out 
door main unit for an air cooled type air conditioning/refrigeration 
according to the prior art. The outdoor main unit comprises condenser coil 
A, and a fan B suspended behind the condense coil A and controlled to suck 
outside air into the inside through gaps in the condenser coil A. This 
design can not effectively carry heat away from the condenser coil A. 
Further, because of the fan motor for the fan B directly receives hot 
currents of air, it performance become low after getting hot. FIG. 2 shows 
another structure of outdoor main unit for an air cooled type air 
conditioning/refrigeration according to the prior art. According to this 
structure of outdoor main unit, the fan D is disposed in front of the 
condenser coil C. When operated, the fan D cause currents of the air 
toward the condenser coil C. Another drawback of this structure of the 
outdoor main unit is that the condenser coils tend to be covered with 
dust, thereby causing the heat exchanging effect to be affected. 
SUMMARY OF THE INVENTION 
The present invention has been accomplished to provide an outdoor main unit 
for an air cooled type air conditioning/refrigeration, which eliminates 
the aforesaid drawback, by the two stage condenser construction for air 
conditioning an refrigeration system. According to one aspect of the 
present invention, the outdoor main unit for an air cooled type air 
conditioning/refrigeration comprises a casing define a first chamber and a 
second chamber, each chamber having the respective air intake port and a 
respective exhaust port, a refrigerant circulation tubing installed in the 
casing for circulation of refrigerant, said refrigerant tubing having 
condenser coil and a main heat exchange coil respectively suspended in the 
two chambers in the casing, a compressor mounted inside the casing and 
controlled to pump the refrigerant through the refrigerant tubing, a fan 
motor mounted inside the casing, a fan blade installed in the first 
chamber and rotated by the fan motor to cause currents of air through the 
main heat exchanger coil toward the exhaust port of the first chamber, and 
a wind wheel installed in the casing and rotated by the fan motor to suck 
currents of air from the air intake port of the second chamber through the 
condenser coil toward the exhaust port of the first chamber. According to 
another aspect of the present invention, the number of turns of the 
condenser coils is greater than the number of turns of the main heat 
exchanger coil, and therefore the main heat exchanger coil produces less 
resistance to the air movement passing through. Because the refrigerant 
circulation tube is divided into a condenser coil and a main heat 
exchanger coil respectively suspended in different chambers in the casing, 
the condensing efficiency is greatly improved, and power consumption is 
greatly saved.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT 
Referring to FIG. 3, an outdoor main unit for an air cooled type air 
conditioning/refrigeration in accordance with the present invention is 
shown comprised of a casing 1, a compressor 2, a refrigerant circulation 
tubing 3, a fan 4, and a wind wheel 5. The compressor 2, refrigerant 
circulation tubing 3, fan 4 and wind wheel 5 are mounted inside the casing 
1. 
The casing 1 comprises a first exhaust port 11 for air discharge, and a 
first air intake port 12 for air input at two opposite end thereof, a wire 
gauze filter 13 covered on the air intake port 12 to remove solid matter 
form air passing through, a second exhaust port 14 for air discharge at 
one lateral side thereof on the middle, a second air intake port 15 for 
air input at two opposite lateral sides thereof in communication with the 
first exhaust port 11, and a partition board 16 disposed between the 
second exhaust port 14 and the second air intake port 15. The partition 
boar 16 separates the holding space of the casing 1 into two enclosed, 
independent spaces, namely, the first enclosed space and the second 
enclosed space. That means, the casing 1 is divided into two connected 
sections and each one means a stage in either heat exchanging or 
condensing stage. 
The compressor 2 is conventional and connecting with refrigerant 
circulation tubing 3 for circulation. However, this is conventional art 
and not been further disclosed. 
The refrigerant circulation tubing 3 is also the conventional art. 
Basically, divided by said partition 16, there is condenser coil 31 
suspended in the second section which within the same space of compressor 
2, and the main heat exchanger coil 32 which within the first section and 
in the same space of fan 4. The tail end of the refrigerant circulation 
tubing 3 is extending out of the casing 1 and further connected to the 
split indoor units of the air conditioning/refrigeration system. 
The fan 4 is installed in the first section inside the casing 1 adjacent to 
the first exhaust port 11 and behind the said main heat exchanger coil 32 
comprised of a fan motor 41 to drive a fan blade 42 for rotation. 
Suspending around the fan blade 42, provides a heat dissipating fan shell 
43 to ensure the currents of air which intaken by the fan blade 42 can 
blow toward to the main heat exchanger coil 32 and the first exhaust port 
11. 
The wind wheel 5 is a wheel like shape suspended in the second enclosed 
space inside the casing 1, the wind wheel 5 having a plurality of narrow 
transverse slots 51 spaced around the periphery. It is driven by the said 
fan motor 41, that means, during the fan motor 41 is rotating, the fan 
blade 42 and wind wheel 5 are rotating simultaneously. Further, wind guide 
52 is installed inside the casing 1 around the wind wheel 5. Said wind 
guide 52 guides currents of air from the wind wheel 5 to the outside of 
the casing 1 through the second exhaust port 14. 
Please refer to the drawings, in practice, when switch on the power, said 
compressor 2 and fan motor 41 works, the refrigerant is circulated through 
the refrigerant circulation tubing 3, outside air is intaken to the inside 
of casing 1 through the second air intake port 15, through fan blade 42 
then blowing toward main heat exchanger coil 32 and discharging from the 
first exhaust port 11. This is the route of hot dissipating air of the 
first stage. In the mean time, the outside air is intaken from the first 
air intake port 12, and cooling the condenser coil 31, then, wind wheel 5 
discharging the hot air to outside of casing 1 through second exhaust port 
14. This is the heat of the refrigeration operation of second stage and it 
can be carried our repeatedly and simultaneously. 
As for the route of refrigerant, once is pumped out by the compressor, it 
flows through the main heat exchanger coil 32 in a certain high speed, 
then, the heat dissipated by the air blown from the fan 4, and when 
flowing through the condenser coil 31, the refrigerant becomes 
refrigerated status, at the meantime, the refrigerant further cooled by 
the intake air from intake port 12. The refrigerant finally becomes fully 
refrigerated which shown as black past of drawings. Then, it flows to the 
split indoor units for air conditioning and refrigeration. 
Refer to the drawings, as for the route of air, when the intake air comes 
from the intake port 12 positioned in the place near the compressor 2 and 
pass through condenser coil 31 then sucked out through the wind wheel 5 
and discharged to the second exhaust port 14. The another air for heat 
exchange intake air enters from the second air intake port 15 and flow 
through fan 4, then flows through the main heat exchanger coil 32 and 
flows out of the casing 1 from the first exhaust port 11. The arrows in 
FIG. 4 show the direction of the air. 
FIGS. 5 and 6 show the other embodiment of the present invention under 
horizontal design. Excepts of the positioning arrangement, all of the 
operations and proceeding are identical to the aforesaid vertical type. 
FIG. 7 shows the equivalent arrangement which caused by the different mode 
of compressor 2. However, the basic principle and operation is identical 
to the above-mentioned embodiment. 
Thus, by the practice of the present invention, the effects which can be 
obtained as: 
1) Dividing the route of refrigerant into independent two sections, namely 
condensing and heat exchanging stage, which can cool the refrigerant 
effectively and increase the refrigeration efficiency. This is no able to 
achieved by the conventional air conditioning/refrigeration apparatus. 
2) Due to the high speed and temperature of refrigerant, therefore, the 
route of heat exchange is more longer but fewer number in coil. Because of 
the high temperature difference, therefore, by the wider- faced fan to 
blows out the huge air and fewer coil to reduce the air resistance, the 
air will flows in more speedy to eliminate the drawback of air circulation 
of conventional art. Due to the refrigerant which had been coiled must be 
condensed, therefore, the condensing coil provided in more coils. And 
because the temperature difference is lesser, therefore, the refrigerant 
flows more slowly. It is to be noted that the wind wheel used in the 
present invention is the key feature which can eliminate the existing 
drawback of heat exchange and refrigeration and meet the requirements of 
air conditioning/refrigeration condition. 
3) Dividing the air for heat exchange and refrigeration into two separate 
areas to promote the cooling efficiency, which enable to make the high 
amperage of compressor lower, decrease electricity consumption, enlarge 
the refrigeration ability, shorten the operation time and save the 
electricity consumption. Furthermore, by using the same motor for power 
supply of the fan for conditioning and refrigeration, which enable the 
motor in the largest output utility, and ensure the maintenance of the 
motor in operation. These functional result are not achievable by the 
convention art. 
It is to be understood that the disclosed embodiment and drawings are 
designed for the illustration only, any equivalent practice which based on 
the principle and operation of the will be within the scope of the present 
invention.