U.S. patent application number 11/132189 was filed with the patent office on 2006-09-07 for ventilation system and pressure intensifying apparatus.
This patent application is currently assigned to LG Electronics Inc.. Invention is credited to Ho Seon Choi, Keun Hyoung Choi, Baik Young Chung, Jeong Yong Kim, Kyung Hwan Kim.
Application Number | 20060199520 11/132189 |
Document ID | / |
Family ID | 36499214 |
Filed Date | 2006-09-07 |
United States Patent
Application |
20060199520 |
Kind Code |
A1 |
Chung; Baik Young ; et
al. |
September 7, 2006 |
Ventilation system and pressure intensifying apparatus
Abstract
A ventilation system and a pressure intensifying apparatus can
smoothly supply air to an indoor room by increasing required air
volume and external static pressure. The ventilation system
includes: a duct branched into at least rooms; a ventilator
connected to the duct, for selectively or simultaneously exhausting
indoor air and supplying outdoor air; and a pressure intensifying
apparatus including a case in which air supply unit/air exhaust
unit connected to the duct are formed, and a fan for increasing
static pressure of air supplied/exhausted through the duct.
Inventors: |
Chung; Baik Young;
(Incheon-si, KR) ; Kim; Kyung Hwan; (Uiwang-si,
KR) ; Kim; Jeong Yong; (Seoul, KR) ; Choi;
Keun Hyoung; (Seoul, KR) ; Choi; Ho Seon;
(Seoul, KR) |
Correspondence
Address: |
GREENBLUM & BERNSTEIN, P.L.C.
1950 ROLAND CLARKE PLACE
RESTON
VA
20191
US
|
Assignee: |
LG Electronics Inc.
Seoul
KR
|
Family ID: |
36499214 |
Appl. No.: |
11/132189 |
Filed: |
May 19, 2005 |
Current U.S.
Class: |
454/238 |
Current CPC
Class: |
F24F 11/0001 20130101;
F24F 7/08 20130101 |
Class at
Publication: |
454/238 |
International
Class: |
F24F 11/00 20060101
F24F011/00 |
Foreign Application Data
Date |
Code |
Application Number |
Feb 15, 2005 |
KR |
P2005-12319 |
Claims
1. A ventilation system comprising: a duct branched into at least
rooms; a ventilator connected to the duct, for selectively or
simultaneously exhausting indoor air and supplying outdoor air; and
a pressure intensifying apparatus including: a case in which air
supply unit/air exhaust unit connected to the duct are formed; and
a fan for increasing static pressure of air supplied/exhausted
through the duct.
2. The ventilation system of claim 1, wherein the pressure
intensifying apparatus includes: at least two air supply units and
at least two air exhaust units connected to the duct; a fan
disposed inside the case, for supply/exhaust air by rotation
thereof; and a drive motor disposed inside the case, for rotating
the fan.
3. The ventilation system of claim 1, wherein the pressure
intensifying apparatus further includes a damper for
opening/closing the air supply unit and the air exhaust unit.
4. The ventilation system of claim 1, wherein the case is formed
evenly, and the air supply unit and the air exhaust unit are
arranged at a periphery of the case.
5. The ventilation system of claim 1, wherein the case has top and
bottom surfaces formed in a circular shape.
6. The ventilation system of claim 1, wherein the case is installed
in a ceiling.
7. The ventilation system of claim 1, wherein the fan is a turbo
fan that sucks air in an axial direction and exhausts air in a
radial direction.
8. The ventilation system of claim 1, wherein the air supply unit
and the air exhaust unit are inclined with respect to a rotational
radius of the fan.
9. The ventilation system of claim 8, wherein the air supply unit
further includes a damper for opening/closing to guide air sucked
inside the case in an axial direction of the fan.
10. The ventilation system of claim 1, wherein the pressure
intensifying apparatus is arranged in a position where the duct is
branched.
11. The ventilation system of claim 1, wherein the duct includes an
air supply duct and an air discharge duct.
12. The ventilation system of claim 11, wherein the pressure
intensifying apparatus is installed in each of the air supply duct
and the air exhaust duct.
13. The ventilation system of claim 1, further comprising a
controller for controlling the ventilator and/or the pressure
intensifying apparatus according to user's input information.
14. A pressure intensifying apparatus comprising: at least two
branched ducts; a case divided into an upper space and a lower
space; an air supply unit and an air exhaust unit for communicating
the upper and lower spaces of the case with the duct; a fan
disposed inside the case, for sucking air through the air supply
unit and exhausting air through the air exhaust unit, or for
sucking air through the air exhaust unit and exhausting air through
the air supply unit; and a drive motor, disposed inside the case,
for rotating the fan.
15. The pressure intensifying apparatus of claim 14, wherein the
case is formed evenly, and at least two air supply units and at
least two air exhaust units are arranged at a periphery of the
case.
16. The pressure intensifying apparatus of claim 14, wherein the
fan is configured to suck air in an axial direction and exhaust air
in a radial direction.
17. The pressure intensifying apparatus of claim 14, wherein the
fan is a double suction fan having an air supply fan and an air
exhaust fan arranged up and down, the air supply fan being
configured to suck air toward in an inside of the case through the
air supply unit and exhaust the sucked air to the air exhaust unit,
the air exhaust fan being configured to suck air through the air
exhaust unit and exhaust the sucked air to the air supply unit.
18. The pressure intensifying apparatus of claim 14, wherein the
air supply unit further includes: an air supply damper for
opening/closing to guide air sucked inside the case in an axial
direction; and an air exhaust damper for opening/closing to guide
air exhausted from the fan toward the duct.
19. The pressure intensifying apparatus of claim 18, wherein the
air supply damper includes a first air supply damper for guiding
air sucked in the air supply unit in an axial direction of the fan,
and a second air supply damper for preventing air from being
exhausted to the air supply unit when the first air supply damper,
and the air exhaust damper includes a first air exhaust damper for
guiding air exhausted from the fan to the air exhaust unit, and a
second air exhaust damper for preventing air from being sucked into
the fan.
20. The pressure intensifying apparatus of claim 19, wherein the
air exhaust damper and the air supply damper alternately open the
air supply unit and the air exhaust unit.
21. The pressure intensifying apparatus of claim 14, wherein the
case is separated into a space where the air supply fan is received
and a space where the air exhaust fan is received.
22. A method for controlling a ventilation system, comprising the
steps of: selecting a predetermined input information; driving a
ventilator; driving a pressure intensifying apparatus so as to
increase an inner pressure of a duct connected to the ventilator;
and increasing a static pressure of the duct by opening a damper,
the damper being openable/closable according to the input
information and provided at a position where the pressure
intensifying apparatus and the duct are connected.
23. A method for controlling a pressure intensifying apparatus,
comprising the steps of: selecting a predetermined input
information; rotating a fan of a pressure intensifying apparatus,
the fan being provided to increase an inner pressure of a duct; and
increasing a static pressure of the duct by opening a damper, the
damper being openable/closable according to the input information
and provided at a position where the pressure intensifying
apparatus and the duct are connected.
Description
[0001] This application claims the benefit of the Korean
Application No. P2005-12319 filed on Feb. 15, 2005, which is hereby
incorporated by reference.
BACKGROUND OF THE INVENTION
[0002] 1. Field of the Invention
[0003] The present invention relates to a ventilation system, and
more particularly, to a ventilation system, a pressure intensifying
apparatus, and a method for controlling the same, in which air
volume and external static pressure can be increased.
[0004] 2. Discussion of the Related Art
[0005] Due to persons' breathes and the like, air in the closed
room is gradually polluted with the lapse of time. A ventilation
system is used to replace polluted indoor air with fresh outdoor
air.
[0006] A general ventilation system includes an air supply fan for
supplying an outdoor air into a room, an air supply duct for
guiding an outdoor air into the room, an air exhaust fan for
exhausting an indoor air out of the room, and an air exhaust duct
for guiding the indoor air out of the room.
[0007] In order to supply air into the room through the duct, the
ventilation system must have required air volume and external
static pressure. For example, when air is supplied through a
circular duct in an about 231-m.sup.2 indoor space by ventilation
of 350 CMH, an external static pressure of about 300 Pa is
required. At this point, airflow resistance of a duct is an
important factor in determining the required air volume and
external static pressure. As the indoor space is wide, a length of
the duct becomes longer. As the number of the partitioned spaces is
increasing, the branches of the duct increase. Consequently, the
airflow resistance increases and the required air volume and
external static pressure increases. However, it is difficult to
increase a capacity of the ventilation system so large as to form
sufficient air volume and external static pressure. Thus, the
ventilation is not performed smoothly.
[0008] Also, the general ventilation system is installed in a
ceiling. However, since the ventilation system is designed
considering spatial efficiency and economic efficiency, there is a
limit in a distance between a bottom of a lower floor and a bottom
of an upper floor. Thus, it is difficult to secure sufficient space
for installing the ventilation system. Accordingly, in order to
solve the problem, the ventilation system needs to be designed to
be small-sized.
SUMMARY OF THE INVENTION
[0009] Accordingly, the present invention is directed to a
ventilation system and a pressure intensifying apparatus that
substantially obviate one or more problems due to limitations and
disadvantages of the related art.
[0010] An object of the present invention is to provide a
ventilation system, a pressure intensifying apparatus, and a method
for controlling the same, in which external static pressure is
formed so high that a wide indoor space can be ventilated.
[0011] Another object of the present invention is to provide a
small-sized ventilation system and a pressure intensifying
apparatus, which can be installed in a narrow space.
[0012] Additional advantages, objects, and features of the
invention will be set forth in part in the description which
follows and in part will become apparent to those having ordinary
skill in the art upon examination of the following or may be
learned from practice of the invention. The objectives and other
advantages of the invention may be realized and attained by the
structure particularly pointed out in the written description and
claims hereof as well as the appended drawings.
[0013] To achieve these objects and other advantages and in
accordance with the purpose of the invention, as embodied and
broadly described herein, there is provided a ventilation system
including: a duct branched into at least rooms; a ventilator
connected to the duct, for selectively or simultaneously exhausting
indoor air and supplying outdoor air; and a pressure intensifying
apparatus including: a case in which air supply unit/air exhaust
unit connected to the duct are formed; and a fan for intensifying
static pressure of air supplied/exhausted through the duct.
[0014] The pressure intensifying apparatus may include: at least
two air supply units and at least two air exhaust units connected
to the duct; a fan disposed inside the case, for supply/exhaust air
by rotation thereof; and a drive motor disposed inside the case,
for rotating the fan. The pressure intensifying apparatus may
further include a damper for opening/closing the air supply unit
and the air exhaust unit.
[0015] The case may be formed evenly, and the air supply unit and
the air exhaust unit may be arranged at a periphery of the case.
The case may have top and bottom surfaces formed in a circular
shape. Also, the case may be installed in a ceiling.
[0016] The air supply unit and the air exhaust unit may be inclined
with respect to a rotational radius of the fan. The air supply unit
may further include a damper for opening/closing to guide air
sucked inside the case in an axial direction of the fan.
[0017] The pressure intensifying apparatus may be arranged in a
position where the duct is branched. The duct may include an air
supply duct and an air discharge duct. The pressure intensifying
apparatus may be installed in each of the air supply duct and the
air exhaust duct.
[0018] The ventilation system may further include a controller for
controlling the ventilator and/or the pressure intensifying
apparatus according to user's input information.
[0019] In another aspect of the present invention, there is
provided a pressure intensifying apparatus including: at least two
branched ducts; a case divided into an upper space and a lower
space; an air supply unit and an air exhaust unit for communicating
the upper and lower spaces of the case with the duct; a fan
disposed inside the case, for sucking air through the air supply
unit and exhausting air through the air exhaust unit, or for
sucking air through the air exhaust unit and exhausting air through
the air supply unit; and a drive motor, disposed inside the case,
for rotating the fan.
[0020] The case may be formed evenly, and at least two air supply
units and at least two air exhaust units may be arranged at a
periphery of the case.
[0021] The fan may be configured to suck air in an axial direction
and exhaust air in a radial direction. The fan may be a double
suction fan having an air supply fan and an air exhaust fan
arranged up and down, the air supply fan being configured to suck
air toward in an inside of the case through the air supply unit and
exhaust the sucked air to the air exhaust unit, the air exhaust fan
being configured to suck air through the air exhaust unit and
exhaust the sucked air to the air supply unit.
[0022] The air supply unit may further include: an air supply
damper for opening/closing to guide air sucked inside the case in
an axial direction; and an air exhaust damper for opening/closing
to guide air exhausted from the fan toward the duct. The air supply
damper may include a first air supply damper for guiding air sucked
in the air supply unit in an axial direction of the fan, and a
second air supply damper for preventing air from being exhausted to
the air supply unit when the first air supply damper, and the air
exhaust damper includes a first air exhaust damper for guiding air
exhausted from the fan to the air exhaust unit, and a second air
exhaust damper for preventing air from being sucked into the fan.
The air exhaust damper and the air supply damper may alternately
open the air supply unit and the air exhaust unit.
[0023] The case may be separated into a space where the air supply
fan is received and a space where the air exhaust fan is
received.
[0024] In a further another aspect of the present invention, there
is provided a method for controlling a ventilation system,
including the steps of: selecting a predetermined input
information; driving a ventilator; driving a pressure intensifying
apparatus so as to increase an inner pressure of a duct connected
to the ventilator; and increasing a static pressure of the duct by
opening a damper, the damper being openable/closable according to
the input information and provided at a position where the pressure
intensifying apparatus and the duct are connected.
[0025] In a still further another aspect of the present invention,
there is provided a method for controlling a pressure intensifying
apparatus, including the steps of: selecting a predetermined input
information; rotating a fan of a pressure intensifying apparatus,
the fan being provided to increase an inner pressure of a duct; and
increasing a static pressure of the duct by opening a damper, the
damper being openable/closable according to the input information
and provided at a position where the pressure intensifying
apparatus and the duct are connected.
[0026] It is to be understood that both the foregoing general
description and the following detailed description of the present
invention are exemplary and explanatory and are intended to provide
further explanation of the invention as claimed.
BRIEF DESCRIPTION OF THE DRAWINGS
[0027] The accompanying drawings, which are included to provide a
further understanding of the invention and are incorporated in and
constitute a part of this application, illustrate embodiment(s) of
the invention and together with the description serve to explain
the principle of the invention. In the drawings:
[0028] FIG. 1 is a schematic view for explaining a ventilation
system according to an embodiment of the present invention;
[0029] FIG. 2 is a view of a pressure intensifying apparatus shown
in FIG. 1;
[0030] FIG. 3 is a perspective view of the pressure intensifying
apparatus shown in FIG. 2;
[0031] FIG. 4 is a side view illustrating an operation of the
pressure intensifying apparatus shown in FIG. 2;
[0032] FIG. 5 is a graph of a relationship between an air volume
and an external static pressure in the ventilation system shown in
FIG. 1;
[0033] FIG. 6 is a perspective view of a pressure intensifying
apparatus according to a second embodiment of the present
invention;
[0034] FIG. 7 is a side view illustrating an operation of the
pressure intensifying apparatus shown in FIG. 6 when air is guided
from an air supply unit to an air exhaust unit; and
[0035] FIG. 8 is a side view illustrating an operation of the
pressure intensifying apparatus shown in FIG. 6 when air is guided
from an air exhaust unit to an air supply unit.
DETAILED DESCRIPTION OF THE INVENTION
[0036] Reference will now be made in detail to the preferred
embodiments of the present invention, examples of which are
illustrated in the accompanying drawings. Wherever possible, the
same reference numbers will be used throughout the drawings to
refer to the same or like parts.
[0037] FIG. 1 is a view for explaining a ventilation system
according to an embodiment of the present invention.
[0038] Referring to FIG. 1, the ventilation system includes a duct
100 spatially branched into at least two indoor spaces, a
ventilator 200 connected to the duct 100 to selectively or
simultaneously exchange indoor air with outdoor air through the
duct 100, and a pressure intensifying apparatus 300 having a fan
(320 in FIG. 2) for increasing a static pressure of air
supplied/exhausted through the duct 100.
[0039] The duct 100 is branched such that the indoor air is
exchanged with outdoor air in the partitioned indoor spaces. The
duct 100 includes an air supply duct 110 for supplying the outdoor
air into the indoor spaces, and an air exhaust duct 120 for
exhausting the indoor air to an exterior. The ventilation system
installed in a wide indoor space is exemplarily shown in FIG. 1.
The air supply duct 110 is indicated by a solid line and the
exhaust duct 120 is indicated by a dotted line. An air supply
diffuser and an air exhaust diffuser are connected to indoor end
portions of the air supply duct 110 and the air exhaust duct 120,
respectively. In FIG. 1, the diffusers are indicated by circles.
Meanwhile, the duct may be configured with only one of the air
supply duct and the air exhaust duct.
[0040] Also, the ducts 110 and 120 can be circular or polygonal.
Because the pressure intensifying apparatus 300 increases a static
pressure in the duct 100, the polygonal duct having a relatively
large airflow resistance can be used. It is apparent that the
circular duct is advantageous to reduce airflow resistance. Such a
duct is buried in a ceiling.
[0041] The ventilator 200 includes a total heat exchanger (not
shown) for exchanging heat between the indoor air and the outdoor
air, and a blower fan (not shown) for blowing the indoor air and
the outdoor air. The total heat exchanger may not be installed in
the ventilator 200. Also, it is preferable to install a filter (not
shown) that filters out foreign particles contained in the supplied
outdoor air.
[0042] In addition, it is preferable to install the pressure
intensifying apparatus 300 in the air supply duct 110 and the air
exhaust duct. It is apparent that the pressure intensifying
apparatus 300 can be installed in only one of the air supply duct
and the air exhaust duct. Further, it is preferable that the
pressure intensifying apparatus 300 is buried in a ceiling. It is
also apparent that two or more pressure intensifying apparatuses
can be respectively installed in the air supply duct and the air
exhaust duct
[0043] The pressure intensifying apparatus will now be described
with reference to FIGS. 2 to 4.
[0044] The pressure intensifying apparatus 300 includes a case 310
installed in the ducts 110 and 120, air supply units 311 connected
to the ducts 110 and 120 to guide air of at least the ducts 110 and
120 into the case 310, air exhaust units 312 for guiding an inside
air of the case 310 to the ducts 110 and 120, a fan 320 installed
inside the case 310 to rotate to supply/exhaust air, and a drive
motor 330 for rotating the fan 320.
[0045] It is preferable that the case 310 is formed evenly. Also,
it is preferable that at least two air supply units 311 and at
least two air exhaust units 312 are provided at a periphery of the
case 310. The case 310 is formed evenly for the purpose of enabling
it to be buried. Also, the air supply unit 311 and the air exhaust
unit 312 are provided at the periphery of the case for the purpose
of enabling the branched ducts 110 and 120 to be connected from all
directions.
[0046] For example, the case 310 has top and bottom surfaces formed
in a circular shape. On the periphery of the case 310, the air
supply unit 311 and the air exhaust duct 312 are formed spaced
apart from each other at predetermined intervals. It is apparent
that the case 310 can be made in a polygonal shape. The case 310
having the top and bottom surfaces formed in the circular shape is
advantageous to reduce airflow resistance.
[0047] As shown in FIG. 4, the fan 320 may be a turbo fan 320 that
sucks air in an axial direction and discharges air in a radial
direction. The turbo fan 320 includes a plurality of blades 321
radially arranged and a donut-shaped shroud 322 fixed to one side
(an upper side in FIG. 3) of the blade 321. Accordingly, the sucked
air passes through the central portion of the shroud 322 and is
then discharged in the radial direction as the blades 321 are
rotating. A high static pressure is formed inside the case 310,
such that air is discharged.
[0048] Because the turbo fan 320 is advantageous to increase the
static pressure, the turbo fan 320 is installed so as to increase
the static pressure in the duct 100. If the turbo fan 320 is used,
the height of the case 310 is lowered, such that the pressure
intensifying apparatus can be easily buried in the ceiling.
[0049] As shown in FIG. 2, it is preferable that the air supply
unit 311 and the air exhaust unit 312 are inclined by a
predetermined angle (e) with respect to a rotational radius of the
turbo fan 320. It aims to reduce airflow resistance because the
supplied/exhausted air flows obliquely with respect to the
rotational radius of the fan 320.
[0050] The pressure intensifying apparatus 300 may further include
dampers 340 and 350 for opening/closing the air supply unit 311 and
the air exhaust unit 312. When the damper 340 disposed at the air
supply unit 311 is opened, air sucked inside the case 310 is guided
in an axial direction (toward an upper portion) of the turbo fan
320. As shown in FIG. 4, the damper 340 is installed to be
rotatable about a lower end thereof. Accordingly, in the case of
the damper 340, a separate guide for guiding air in the axial
direction of the turbo fan 320 need not be installed.
[0051] The ventilator 200 and/or the pressure intensifying
apparatus 300 may further include a controller (not shown) for
controlling it depending on user's input information. The
controller (not shown) for the pressure intensifying apparatus 300
controls the static pressure of air passing through the
intensifying apparatus 300 by selectively opening/closing the
damper 340 depending on the input information.
[0052] The pressure intensifying apparatus 300 can be applied to
gas circulating devices, such as a ventilation system and an air
conditioner.
[0053] An operation of the ventilation system and the pressure
intensifying apparatus according to the present invention will now
be described.
[0054] A ventilation mode is started according to a user's
selection. At this point, an air supply stroke and an air exhaust
stroke can be done at the same time, or only one stroke of them can
be done. The former case will be described below.
[0055] When the ventilator 200 operates, an outdoor air flows along
the air supply duct 110 and a polluted indoor air flows along the
air exhaust duct 120 due to pressure of the ventilator 200. The
static pressure in the duct is greatly reduced due to airflow
resistance generated while the indoor and outdoor air flows through
the ducts 110 and 120.
[0056] In such a state, as shown in FIG. 4, the pressure
intensifying apparatus 300 opens the dampers 340 and 350 such that
air flowing through the ducts 110 and 120 is distributed to the
branched ducts. At this point, the damper 340 disposed at the air
supply unit 311 is opened in an inclined manner such that an upper
portion of the air supply unit 311 is opened. Accordingly, air
introduced in the air supply unit 311 is guided toward the central
portion of the turbo fan 320 by the damper 340.
[0057] As the turbo fan 320 rotates, the guided air flows in a
radial direction. This operation of the turbo fan 320 causes
airflow pressure to increase greatly in the inner periphery of the
case 310. Accordingly, air discharged through the air exhaust unit
312 is in a state of very high pressure and is exhausted to the
ducts 110 and 120 connected to the air exhaust unit 312.
Consequently, the static pressure in the ducts 110 and 120 can
increase greatly.
[0058] FIG. 5 is a graph of a test result when the pressure
intensifying apparatus 300 is installed in an about 231-m.sup.2
indoor space. When the pressure intensifying apparatus 300 is not
installed, the static pressure in the ducts 110 and 120 is about
170 Pa (L.sub.1). On the contrary, when the pressure intensifying
apparatus 300 is installed, the static pressure in the ducts 110
and 120 is about 300 Pa (L.sub.2), which is two times as high as
the former case. Accordingly, the pressure intensifying apparatus
300 can supply/exhaust sufficient air to/from the indoor space.
[0059] FIGS. 6 to 8 are views of a pressure intensifying apparatus
400 according to a second embodiment of the present invention.
[0060] The pressure intensifying apparatus 400 includes a case 410,
an air supply unit 411, an air exhaust unit 412, an air supply fan
420, and an air exhaust fan 430. The case 410 is installed in at
least two branched ducts 110 and 120 and is divided into an upper
space and a lower space. The air supply unit 411 and the air
exhaust unit 412 communicate the upper and lower spaces of the case
410 with the ducts 110 and 120. The air supply fan 420 and the air
exhaust fan 430 are installed inside the case 410 and are coaxially
connected with a drive motor 440.
[0061] The case 410 has top and bottom surfaces formed in a
circular shape. On the periphery of the case 410, the air supply
unit 411 and the air exhaust unit 412 are formed spaced apart from
each other at predetermined intervals. The case 310 having the top
and bottom surfaces formed in the circular shape is advantageous to
reduce the airflow resistance. Also, an entire height of the case
410 can be reduced.
[0062] The air supply fan 420 sucks air through the air supply unit
411 and exhausts it to the air exhaust unit 412. The air exhaust
fan 412 sucks air through the air exhaust unit 412 and exhausts it
to the air supply unit 411. It is preferable that the fans 420 and
430 are a double suction fan in which the air supply fan 420 and
the air exhaust fan 430 are coaxially connected to the drive motor
440.
[0063] The case 410 is partitioned to separate the spaces where the
air supply fan 420 and the air exhaust fan 430 are installed.
[0064] The air supply unit 411 includes a first air supply damper
451 for guiding the sucked air in an axial direction of the air
supply fan 420, and a second air supply damper 461 for preventing
the air from being exhausted from the air exhaust fan 430 to the
air supply unit 411 when the first air supply damper 451 is opened.
The air exhaust unit 412 includes a first air exhaust damper 452
for guiding the air exhausted from the air supply fan 420 to the
air exhaust unit 412 toward the air exhaust duct 120, and a second
air exhaust damper 462 for preventing air from being sucked to the
air exhaust fan 430 when the first air exhaust damper 452.
[0065] As shown in FIGS. 6 or 7, the air supply dampers 451 and 461
and the air exhaust dampers 452 and 462 are installed up and down
such that they are rotatable about a partition plate that separates
the air supply fan 420 and the air exhaust fan 430. Also, the first
air supply damper 451 is opened in an inclined manner such that an
upper surface of the air supply fan 420 is opened. The second air
supply damper 462 is opened in an inclined manner such that a lower
portion of the air exhaust fan 430 is opened. Accordingly, if the
dampers 451 and 462 are applied, a separate guide for guiding air
in an axial direction of the fan need not be installed.
[0066] In the operation of the air supply dampers 451 and 461 and
the air exhaust dampers 452 and 462, when the first air supply
damper 451 and the first air exhaust damper 452 are opened, the air
supply fan 420 operates to increase the static pressure of air
supplied from the air supply unit 411 to the air exhaust unit 412.
When the second air exhaust damper 462 and the second air supply
damper 461 are opened, the air exhaust fan 430 operates to increase
the static pressure of air supplied from the air exhaust unit 412
to the air supply unit 411. At this point, the dampers can be
selectively opened/closed.
[0067] As described above, in the case of the double suction fan,
the static pressure of the ducts 110 and 120 can be increased at
the same time by installing the pressure intensifying apparatus 400
in the intersection between the air supply duct 110 and the air
exhaust duct 120, not in each of the air supply duct and the air
exhaust duct 120.
[0068] Also, the air supply dampers 451 and 461 and the air exhaust
dampers 452 and 462 are selectively opened and closed, such that
the connection between the air supply unit 411 and the duct 110 and
between the air exhaust unit 412 and the duct 120 can be modified.
Also, air volume provided to the ducts 110 and 120 can be
changed.
[0069] It will be apparent to those skilled in the art that various
modifications and variations can be made in the present invention.
Thus, it is intended that the present invention covers the
modifications and variations of this invention provided they come
within the scope of the appended claims and their equivalents.
* * * * *