HEAT EXCHANGE UNIT WITH VENT

Technical Field

The present invention relates to air conditioners, and more particularly, to a

ventilating and heat exchanging unit in an air conditioner, for ventilating a room and

temperature control of air being supplied to the room.

Background Art

In general, the air conditioner cools or heats a room, such as a residential space,

a restaurant, a library, an office, and so on. For this, a related art air conditioner is

provided with a compressor, a condenser, an expansion device, and an evaporator, for

cooling or heating room air by phase change of refrigerant passing through the

compressor, condenser, expansion device, and the evaporator.

In the air conditioners, there are a package type air conditioner which has an

outdoor unit and an indoor unit fabricated as one unit, and a separate type air

conditioner which has the outdoor unit and the indoor unit separated from each other.

Having the indoor unit which heat exchanges with room air, and the outdoor

unit which heat exchanges with outdoor air integrated inside of a case, the package type

air conditioner is mounted on a window, mostly.

With regard to the separate type air conditioner, the indoor unit which heat

exchanges with room air is attached to a room wall or ceiling, and the outdoor unit

which heat exchanges with outdoor air, separate from the indoor unit, is mounted on a

veranda of an apartment or on an exterior wall of a building.

However, recently, since the related art indoor unit of the air conditioner simply

circulates air to cool or heat the room, development of an air conditioner for cooling and

heating, as well as ventilating the room is required for maintaining a more comfortable

room environment.

Moreover, development of an indoor unit of an air conditioner, i.e., a ventilating

and heat exchanging unit, is required for minimizing heat loss during ventilation, simple

installation of the air conditioner, and utilization of a room space, effectively.

Furthermore, development of an air conditioner is required, for cooling, and

heating a plurality of room with one heat exchange unit.

Disclosure of Invention

An object of the present invention is to provide a ventilating and heat

exchanging unit in an air conditioner, in which a room cooling and heating function is

provided together with a ventilating function, for maintaining a more comfortable room

environment.

Another object of the present invention is to provide a ventilating and heat

exchanging unit which can minimize heat loss during ventilation of room, and can be

installed, conveniently.

The objects of the present invention can be achieved by providing a ventilating

and heat exchanging unit including a regenerative heat exchanger portion for making

outdoor air supplied to a room and room air discharged to an outside of the room for

ventilation to heat exchange with each other, a heat exchanger for controlling a

temperature of air supplied to the room, and a cabinet for housing the regenerative heat

exchanger portion on one side of inside thereof and the heat exchanger on the other side

of the inside thereof.

The cabinet includes a first inlet for introduction of the room air thereto, a first

outlet for discharging air from the heat exchanger to the room, a second inlet for

supplying the outdoor air to the regenerative heat exchanger portion, and a second outlet

for discharging the room air heat exchanged at the regenerative heat exchanger.

The firsf inlet is in communication with the second outlet selectively, and the

second inlet is in communication with the first outlet selectively.

The regenerative heat exchanger includes a first opening for discharging the

outdoor air drawn through the second inlet to the heat exchanger, a second opening for

drawing the room air introduced into the cabinet through the first inlet, a first damper on

the first opening for opening/closing the first opening, and a second damper on the

second opening for opening/closing the second opening.

The first damper and the second damper are opened/closed by rotation of the

first damper and the second damper, respectively.

The second damper guides the room air introduced into the cabinet through the

first inlet to the second opening in a total ventilating mode, and guides a portion of the

room air introduced into the cabinet through the first inlet to the second opening in a

partial ventilating mode.

The cabinet further includes a guide wall which forms a suction flow passage of

the room air introduced thereto through the first inlet, and a discharge flow passage of

the air discharged through the first outlet.

The guide wall includes one end connected to an inside wall of the cabinet

between the first inlet and the first outlet, and the other end spaced a distance from the

regenerative heat exchanger portion, for making the suction flow passage and the

discharge flow passage in communication, and connected to the second damper in the

total ventilating mode.

The ventilating and heat exchanging unit further includes a first fan between the

heat exchanger and the first outlet for forcing air to flow from the heat exchanger to the

first outlet, and a second fan for forcing air to flow from the first inlet to the second

outlet when the first inlet and the second outlet are in communication.

The second fan is mounted on one side of the second outlet, or in the suction

flow passage.

The first fan and the second fan are driven by the same motor.

Brief Description of Drawings

The accompanying drawings, which are included to provide a further

understanding of the invention, illustrate embodiment(s) of the invention and together

with the description serve to explain the principle of the invention. In the drawings;

FIG. 1 illustrates a perspective view showing a state of installation of an air

conditioner having a ventilating and heat exchanging unit of the present invention

applied thereto, schematically;

FIG. 2 illustrates a perspective view showing an inside of a ventilating and heat

exchanging unit in accordance with a first preferred embodiment of the present

invention;

FIG. 3 illustrates a plan view showing an inside of a ventilating and heat

exchanging unit in accordance with a first preferred embodiment of the present

invention;

FIG. 4 illustrates a partial longitudinal sectional view of a ventilating and heat

exchanging unit in accordance with a first preferred embodiment of the present

invention;

FIGS. 5 A and 5B illustrate a perspective view and a section of a double suction

sirocco fan provided to a ventilating and heat exchanging unit in accordance with a first

preferred embodiment of the present invention, respectively;

FIG. 6 illustrates a plan view showing an inside of a ventilating and heat

exchanging unit in accordance with a second preferred embodiment of the present

invention, schematically;

FIG. 7 illustrates a plan view showing an inside of a ventilating and heat

exchanging unit in accordance with a third preferred embodiment of the present

invention, schematically;

FIG. 8 illustrates a plan view showing an inside of a ventilating and heat

exchanging unit in accordance with a fourth preferred embodiment of the present

invention, schematically;

FIG. 9 illustrates a plan view showing an inside of a ventilating and heat

exchanging unit in accordance with a fifth preferred embodiment of the present

invention, schematically; and

FIGS. 1OA and 1OB illustrate a plan view and a perspective view of an X-fan

assembly and an X-fan provided to a ventilating and heat exchanging unit in accordance

with a fifth preferred embodiment of the present invention, respectively.

Best Mode for Carrying Out the Invention

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.

An air conditioner having a ventilating and heat exchanging unit applied thereto

will be described with reference to FIG. 1.

Referring to FIG. 1, the air conditioner having a ventilating and heat exchanging

unit applied thereto includes an outdoor unit 100 for heat exchange with outdoor air, a

ventilating and heat exchanging unit 200 having a ventilating function and a

temperature controlling function of air supplied to a room, and duct portion 300

connected to the ventilating and heat exchanging unit for guiding air.

The outdoor unit 100 is installed on an exterior wall or a veranda of a building,

and includes a compressor (not shown) for compressing and discharging circulating

refrigerant, an outdoor heat exchanger (not shown) for heat exchange with outdoor air, a

fan (not shown) on one side of the outdoor heat exchanger for forcing flow of air, and

an outdoor unit case (not shown) for forming an exterior, and accommodating the

compressor, the outdoor heat exchanger, and the fan.

The ventilating and heat exchanging unit 200 performs a function of

conventional indoor unit in which air supplied to the room is cooled, or heated, as well

as a ventilating function.

Moreover, the ventilating and heat exchanging unit 200 has a system to perform

a function of minimizing a heat loss by making outdoor air being supplied to the room

and room air being discharged to an outside of the room to heat exchange.

Though the ventilating and heat exchanging unit 200, having above functions,

can be mounted on a ceiling or a wall of a room, it is preferable that the ventilating and

heat exchanging unit 200 is on a ceiling of the veranda for effective utilization of a

room space.

In general, the veranda adjoins with a living room, and has a ceiling higher than

the living room or the room. According to this, formation of a space of a predetermined

size in the ceiling or the wall is not required for mounting the ventilating and heat

exchanging unit 200 therein.

Moreover, harm to a fine view of the room caused by installation of the

ventilating and heat exchanging unit 200 can be avoided, and a plurality of rooms can

be cooled or heated with only one ventilating and heat exchanging unit 200.

The duct part includes a first duct 310 for guiding room air to the ventilating

and heat exchanging unit 200, and a second duct 320 for guiding air from the ventilating

and heat exchanging unit 200 to the room.

It is preferable that the ducts 310, and 320 of the duct portion 300 are mounted

inside of the ceiling of the room, and has a double pipe structure for minimizing a heat

loss. In more detail, each of the ducts 310 and 320 has an inner pipe, and an outer pipe

around the inner pipe (not shown). There is an air layer between the inner pipe and the

outer pipe having a heat insulating function, for minimizing heat loss during flow of air.

In addition to this, there is a fan power unit 400 at an end of the second duct

320 for drawing air from the room, and discharging to the room together with air

supplied from the ventilating and heat exchanging unit 200. The fan power unit 400

includes a housing (not shown) forming an exterior, and a fan (not shown) in the

housing. It is preferable that a filter is provided in the housing for cleaning air

discharged to the room.

A first embodiment of the ventilating and heat exchanging unit will be described with

reference to FIGS. 2 and 4. FIG. 2 illustrates a perspective view showing an inside of a

ventilating and heat exchanging unit in accordance with a first preferred embodiment of

the present invention, FIG. 3 illustrates a plan view showing an inside of a ventilating

and heat exchanging unit in accordance with a first preferred embodiment of the present

invention, and FIG. 4 illustrates a partial longitudinal sectional view of a ventilating and

heat exchanging unit in accordance with a first preferred embodiment of the present

invention.

Referring to FIGS. 2 to 4, the. ventilating and heat exchanging unit in

accordance with a first preferred ^' embodiment of the present invention includes a

regenerative heat exchanger portion 210 for making outdoor air being supplied from

outdoor for ventilation, and room air being discharged to an outside of room to heat

exchange with each other, a heat exchanger 220 for temperature control of air supplied

to the room, and a cabinet 230 for accommodating the regenerative heat exchanger

portion 210 and the heat exchanger 220.

The cabinet 230 has the regenerative heat exchanger portion 210 mounted on

one side of an inside thereof, and the heat exchanger 220 mounted on the other side of

an inside thereof.

In more detail, the cabinet 230 includes a first inlet 231 for drawing room air, a

first outlet 232 for ^' discharging air from the heat exchanger 220 to the room, a second

inlet 233 for supplying outdoor air to the regenerative heat exchanger portion 210, and a

second outlet 234 for discharging room air heat exchanged at the regenerative heat

exchanger portion 210 to an outside of the room.

In the cabinet 230 of a shape of a hexahedron box, the first duct 310 is

connected to the first inlet 231, and the second duct 320 is connected to the first outlet

232. There may be a preheater 233a at the second inlet 233 for heating outdoor air

introduced into the regenerative heat exchanger portion 210.

In the meantime, it is preferable that the first inlet 231 and the first outlet 232

are formed at one side, i.e., at a back surface of the cabinet 230, and it is preferable that

the second inlet 233 and the second outlet 234 are formed at the other side opposite to

the one side, i.e., a front surface.

It is preferable that the cabinet 230 of above configuration is installed on the

ceiling of the veranda such that the back surface of the cabinet 230 having the first inlet

231 and the first outlet 232 faces the room, more preferably, the cabinet 230 of above

configuration is installed at a corner of the ceiling of the veranda such that the other side

surface perpendicular both to the front surface and the back surface of the cabinet 230 is

in close contact with one side wall of the veranda.

For this, the ventilating and heat exchanging unit 200 is constructed such that

the first inlet 231 is in communication with the second outlet 234 selectively, and the

second inlet 233 is in communication with the first outlet 232, selectively.

The regenerative heat exchanger portion 210 will be described in more detail.

The regenerative heat exchanger portion 210 includes a first opening 211 for

discharging outdoor air drawn through the second inlet 233 toward the heat exchanger

220, a second opening 212 for passing the room air introduced into the cabinet 230

through the first inlet 231, a first damper 213 for opening/closing the first opening 211,

and a second damper 214 for opening/closing the second opening 212.

The regenerative heat exchanger portion 210 has a partition wall 215 with the

first opening 211 and the second opening 212 formed therein, which also forms a space

for housing the heat exchanger 220.

The regenerative heat exchanger portion 210 includes a regenerative heat

exchanger 216 of a hexahedron box shape therein. However, the shape of the

regenerative heat exchanger 216 is not limited to the hexahedron.

The regenerative heat exchanger 216 has a first flow passage (not shown) for

flow of room air discharged to an outside of the room, and a second flow passage (not

shown) perpendicular to the first flow passage for flow of the outdoor air supplied to the

room.

In order to enhance heat exchange efficiency of the regenerative heat exchanger

216, though it is preferable that the regenerative heat exchanger 216 has a layered

structure in which the first flow passages and the second flow passages stacked

alternately perpendicular to each other. However, the structure of the regenerative heat

exchanger 216 is not limited to the layered structure.

The first flow passage makes the second opening 212 and the second outlet 234

in communication, and the second flow passage makes the first opening and the second

inlet 233 in communication. According to above structure, the room air passing through

the first flow passage is made to heat exchange with the outdoor air passing through the

second flow passage, thereby minimizing a heat loss.

Though the regenerative heat exchanger 216 may be mounted in various

directions depending on design conditions, the regenerative heat exchanger 216 may be

mounted on one side of an inside of the cabinet such that one of the first and the second

flow passages is perpendicular to the front surface of the cabinet 23 ^' 0.

For an example, one side of the regenerative heat exchanger 216 having an

opening of the second flow passage formed therein may be mounted in close contact

with, or adjacent to a front inside wall of the cabinet 230, and the second inlet is formed

in the front surface of the cabinet 230 opposite to one side of the regenerative heat

exchanger 216, for introduction of outdoor air. In this case, a total length of the cabinet

230 can be reduced.

In the meantime, it is preferable that the cabinet 230 has an inspection opening

235 in a bottom, particularly under the regenerative heat exchanger 216, for

maintenance of the regenerative heat exchanger 216, and the inspection opening 235 has

an opening/closing door 236.

The inspection opening 235 has supporting bars 237 on upper edges for

supporting edges of the regenerative heat exchanger 216, to prevent the regenerative

heat exchanger 216 from falling down when a door 236 thereon is opened.

Different from this, a bottom of the regenerative heat exchanger 216 may be

constructed from metal, and the door 236 may be provided with a magnet for holding

the regenerative heat exchanger 216.

Accordingly, when the door 236 is opened for maintenance of the regenerative

heat exchanger 216, the regenerative heat exchanger 216 does not fall down, but drawn

out of the cabinet 230 through the inspection opening 235 in a state the regenerative

heat exchanger 216 is attached to the door 236. Of course, it is preferable that the

regenerative heat exchanger 216 is formed of a light material.

The first damper 213 and the second damper 214 are rotatably mounted for

opening/closing. Opening angles of the first damper 213 and the second damper 214

controlled according to operation modes of the air conditioner.

The ventilating and heat exchanging unit of the present invention has operation

modes including a total ventilating mode in which entire room air introduced into the

cabinet 230 through the first inlet 231 is discharged through the second outlet 234, a

partial ventilating mode in which a portion of room air introduced into the cabinet 230

through the first inlet 231 is discharged through the second outlet 234, and a room air

circulating mode ventilating mode in which entire air introduced into the cabinet 230

through the first inlet is supplied to the room again through the first outlet 232.

For this, in the total ventilating mode, the second damper 214 guides entire

room air introduced into the cabinet 230 through the first inlet 231 to the second

opening 212. In the partial ventilating mode, the second damper 214 guides a portion of

room air introduced into the cabinet 230 through the first inlet 231 to the second

Opening 212. In the room air circulating mode, the second damper 214 closes the second

opening 212, so that entire room air drawn through the first inlet 231 is introduced to

the heat exchanger 220.

The heat exchanger 220, having a refrigerant pipe (not shown) connected

thereto for flow of refrigerant, performs an air conditioning function as the refrigerant

flowing through an inside of the heat exchanger 220 absorbs heat from, or discharges

heat to the air passing through the heat exchanger 220.

In addition to above, it is preferable that the cabinet 230 has a guide wall 238

which forms a suction flow passage of the room air introduced thereto through the first

inlet 231 , and a discharge flow passage of the air discharged through the first outlet 232,

which discharge flow passage is in communication with the suction flow passage.

In the discharge flow passage, there is the heat exchanger 220, so that the room

air introduced thereto through the first inlet 231 , and/or the outdoor air supplied thereto

through the first opening 211 is cooled or heated at the heat exchanger 220, and

supplied to the room through the second duct 320 connected to the first outlet 232.

In more detail, the guide wall 238 has one end connected to an inside wall of

the cabinet between the first inlet 231 and the first outlet 232, and the other end spaced a

distance from the regenerative heat exchanger portion 210, to form an opening (not

shown) for making the suction flow passage and the discharge flow passage in

communication.

The guide wall 238 is connected to the second damper 214 such that the room

air introduced through the first inlet 231 is guided to the second opening 212 of the

regenerative heat exchanger portion 210 in the total ventilating mode.

It is preferable that the ventilating and heat exchanging unit 200 of the present

invention includes a first fan 240 for forcing ^' air to flow from the heat exchanger 220 to

the first outlet 232, and a second fan 250 for forcing air to flow from the first inlet 231

to the second outlet 234 when the first inlet 231 and the second outlet 234 are in

communication.

In more detail, the first fan 240 is mounted between the heat exchanger 220 and

the first outlet 232, i.e., in the discharge flow passage, for drawing the room air

introduced through the first inlet 231 and/or the outdoor air discharged through the first

opening 211, and blows toward the first outlet 232.

The second fan 250 is mounted in the suction flow passage, for forced suction

of room air through the first inlet 231 and discharge toward the second opening 212. It

is preferable that the second fan 250 has a partition 251 at an outlet portion for splitting

the outlet portion at a predetermined ratio.

It is preferable that the partition 251 is extended toward the partition wall 215

of the regenerative heat exchanger 210, for dividing the air discharged from the

discharge portion at a predetermined ratio, and being connected to the second damper

214 to be opened at a predetermined angle in the partial ventilating mode.

According to above configuration, in a case the second opening 212 is closed

by the second damper 214, the air from the second fan 250 is introduced into the

discharge flow passage, and passes through a heat exchange process at the heat

exchanger 220.

If the second damper 214 is connected to the guide wall 238 to close the

opening between the suction flow passage and the discharge flow passage, the air from

the second fan 250 is introduced into the regenerative heat exchanger 216 through the

second opening 212, and discharged to an outside of the cabinet through the second

outlet 234.

If the second damper 214 is rotated at a predetermined angle to open both the

second opening 212 and the opening between the discharge flow passage and the

suction passage, that is, if the second damper is connected to the partition, the air from

the second fan 250 is split at a predetermined ratio, and introduced into the discharge

flow passage and the regenerative heat exchanger 216, respectively.

Of course, the second fan 250 may be mounted on one side of the second outlet

234 or between the first flow passage of the regenerative heat exchanger and the second

opening 212.

Moreover, the fans may be mounted, not in the ventilating and heat exchanging

unit 200, but in the duct portion 300, for forcing the air to flow.

Embodiments of the fans will be described in more detail, with reference to FIGS. 5 A

and 5B. FIGS. 5A and 5B illustrate a perspective view and a section of a double suction

sirocco fan provided to a ventilating and heat exchanging unit in accordance with a first

preferred embodiment of the present invention, respectively;

At least one of the first fan 240 and the second fan 250 may be sirocco fan. The

sirocco fan, a fan for drawing air in an axial direction and discharging the air in ^' a

circumferential direction, has low flow noise, is easy to install inside of the cabinet 230,

and raises a static pressure, to increase an air flow rate.

In the embodiment, the sirocco fan is a double suction sirocco fan 260 having a

suction in opposite sides with an increased air flow rate. The double suction sirocco fan

260 includes a fan housing 261, an exterior thereof, having suction openings 261a in

opposite sides, and a plurality of blades 262 rotatably mounted in the fan housing 261

by a motor.

It is preferable that the double suction sirocco fan 260 is provided with a

partition 263 for splitting an inside portion thereof such that a ratio of an air flow rate

drawn into one side suction opening to an air flow rate drawn into the other side suction

opening is at a predetermined ratio.

In the embodiment, both the first fan 240 and the second fan 250 are the double

suction sirocco fan 260.

If the first fan is the double suction sirocco fan 260, it is preferable that the

partition 263 is formed to pass through the heat exchanger 220, and extend toward the

first opening 211 of the regenerative heat exchanging portion such that the partition 263

is connected to the first damper 213 opened at a predetermined angle in the partial

ventilating mode. However, the structure of the partition is not limited to above

structure.

If the second fan is the double suction sirocco fan 260, it is preferable that the

partition 263 is formed to extend toward the second opening 212 of the regenerative

heat exchanging portion 210 such that the partition 263 is connected to the second

damper 214 opened at a predetermined angle in the partial ventilating mode.

According to this, in the partial ventilating mode, the room air drawn through

the first inlet 231 is split at a predetermined ratio, and introduced into the heat

exchanger 220 and the regenerative heat exchanger 216, respectively.

The first fan 240 also has the outdoor air introduced' thereto at a flow rate

corresponding to a flow rate of the room air discharged to an outside of the room, and

discharged to the first outlet 232 together with the room air introduced into the heat

exchanger 220 from the first inlet 231.

Of course, the first fan 240 and/or the second fan 250 may be a turbofan, an

axial fan with a guide, or a cross flow fan.

The first fan 240 is surrounded by the heat exchanger 220, and the inside wall

of the cabinet 230, so that the entire air drawn by the first fan 240 is cooled or heated by

the heat exchanger 220.

For this, the heat exchanger 220 has one end connected to the inside wall of the

cabinet, i.e., a back surface, having the guide wall 238 connected thereto, and the other

end connected to the other side inside wall, an inside wall of a side surface,

perpendicular to the back surface of the cabinet having the guide wall 238 connected

thereto, to form ^' an 'I" shape in overall.

Of course, though the heat exchanger 220 may have the one end connected to

the guide wall 238, and the other end connected to the inside wall, i.e., the inside wall of

the side surface, of the cabinet 230 opposite to the guide wall 238, to form an "1" shape,

the 'I" shape is advantageous in that an area of heat exchange increases.

If the heat exchanger 220 has the "L" shape, it is preferable that a flow guide

239 is provided at a position at a inlet side of the heat exchanger 220, particularly, at a

position adjacent to the bent portion, for preventing the air introduced into the heat

exchanger 220 from leaning to one side.

Of course, because the flow guide 239 is provided for uniform distribution of

the air introduced into the heat exchanger 220 throughout entire surface of the heat

exchanger 220, the flow guide 239 has a relation to a flow direction of the air

introduced into the heat exchanger 220 from the suction flow passage deeper than a

relation to a shape of the heat exchanger 220.

The operation of the foregoing ventilating and heat exchanging unit of the

present invention will be described.

When the user designates the room air circulating mode, and sets a desired

room air temperature, the first damper 213 and the second damper close the first

opening 211 and the second opening 212.

When the first fan 240 and the second fan 250 are driven by respective motors,

room air is introduced into the cabinet 230 through the first inlet 231 connected to the

first duct 310. Then, the room air passes through the suction flow passage, and

introduced into, and is heat exchanged at, the heat exchanger 220 in the discharge flow

passage. Then, the air is drawn into the second fan 250, discharged to the first outlet 232,

and guided to the room by the second duct 320, to cool or heat the room.

If the user selects the partial ventilating mode, and sets a desired room

temperature, the first damper 213 and the second damper 214 are opened at

predetermined angles, and connected to the partitions of the double suction sirocco fans

260 of the first fan 240 and the second fan 250.

When the first fan 240 and the second fan 250 are driven by respective motors,

room air is introduced into the cabinet 230 through the first inlet 231 connected to the

first duct 310. A portion of the room air introduced into the cabinet 230 is introduced

into the first flow passage of the regenerative heat exchanger 216 in communication

with the second opening 212, the rest of portion is introduced into, and heat exchanged

at, the heat exchanger 220 in the discharge flow passage.

At the same time with this, as the first fan 240 is driven, outdoor air is

introduced into the second flow passage of the regenerative heat exchanger 216 through

the second inlet 233, makes heat exchange with the room air passing through the first

flow passage, is introduced into the heat exchanger 220 through the first opening 211,

and heat exchanged at the heat exchanger 220. After heat exchanged with the outdoor

air flowing along the second flow passage, the room air introduced into the first flow

passage is discharged to an outside of the room through the second outlet 234.

The room air and the outdoor air heat exchanged at the heat exchanger 220 is

supplied to the room by the second fan 250, to ventilate, as well as cool or heat the

room.

In the meantime, if the user selects the total ventilating mode, and sets a desired

room temperature, the first damper 213 and the second damper 214 are opened fully,

and the first damper 213 is connected to the guide wall 238.

When the first fan 240 and the second fan 250 are driven by respective motors,

room air is introduced into the cabinet 230 through the first inlet 231 connected to the

first duct 310.

The entire room air introduced into the cabinet 230 is introduced into a first

flow passage of the regenerative heat exchanger 216 in communication with the second

opening 212 by the second damper 214.

At the same time with this, as the first fan 240 is driven, outdoor air is

introduced into a second flow passage of the regenerative heat exchanger 216 through

the second inlet 233, makes heat exchange with room air passing through the first flow

passage, is introduced into the heat exchanger 220 through the first opening 211, and is

heat exchanged at the heat exchanger 220. After heat exchanged with the outdoor air

flowing along the second flow passage, the room air introduced into the first flow

passage is discharged to an outside of the room through the second outlet 234.

The outdoor air heat exchanged at the heat exchanger 220 is supplied to the

room by the first fan 240, to ventilate, as well as cool or heat the room.

The operation mode of the ventilating and heat exchanging unit may be selected

manually, or automatically by a controller connected to a predetermined temperature

sensor, and a turbidity sensor of the room air.

Meanwhile, the guide wall 238 and the partition 251 of the ventilating and heat

exchanging unit in accordance with a first preferred embodiment of the present

invention are components for making air flow smoother.

However, if the second fan 250 is mounted in the duct portion 300, on one side

of the second outlet 234, or in the regenerative heat exchanger 210, or if the housing of

the fan serves as the guide wall, or the like, the guide wall may not be provided.

Though the partition 251 is omitted from other embodiments of a ventilating

and heat exchanging unit of the present invention to be described herein below, if the

partition 251 is provided, there is an advantage in that it is effective in maintaining a

ratio of ventilating air to circulating air re-supplied to the room.

Other embodiments of the ventilating and heat exchanging unit of the present

invention will be described with reference to FIGS. 6 to 9. In describing other

embodiments of the ventilating and heat exchanging unit of the present invention, parts

identical to the first embodiment ventilating and heat exchanging unit will be given the

same names and reference numerals, and repetitive description of which will be omitted.

A second embodiment of the ventilating and heat exchanging unit of the present

invention will be described with reference to FIG. 6.

Referring to FIG. 6, the ventilating and heat exchanging unit 200a includes a

pipe receiving portion 270 in the cabinet 230.

The pipe receiving portion 270 is between an inside wall of a side surface

perpendicular to the other side of the cabinet 230 having the second inlet 233 and the

second outlet 234 formed therein and the regenerative heat exchanger portion 210, for

housing a condensed water pipe for discharging condensed water formed at the heat

exchanger 220, and a refrigerant pipe 272 connected to the heat exchanger.

Accordingly, if the cabinet 230 is mounted at a corner of the ceiling of the

veranda such that the pipe receiving portion 270 faces the wall surface of the veranda,

disposal of the condensed water pipe 271 and the refrigerant pipe 272 becomes easy.

Since other configurations of the second embodiment are identical to the first

embodiment ventilating and heat exchanging unit 200, description of which will be

omitted.

Next, third and fourth embodiments of the ventilating and heat exchanging unit

of the present invention having a first fan 240 and a second fan 250 driven by one motor

will be described, with reference to FIGS. 7 and 8.

Referring to FIG. 7, in the third embodiment ventilating and heat exchanging

unit 200b of the present invention, the first fan 240 and the second fan 250 are coupled'

to a rotation shaft of a motor 280 mounted passed through the guide wall 238.

However, a case causes a problem, when the first fan 240 and the second fan

250 have the same structure, for an example, if the fans 240 and 250 are the double

suction sirocco fan 260.

In other words, if the double suction sirocco fan of the first fan 240 and the

double suction sirocco fan of the second fan 250 are mounted in a state the first fan 240

and the second fan 250 are turned by 180° around an axis vertical to a bottom of the

cabinet 230 such that air discharge directions thereof are opposite, one of the double

suction sirocco fans can not perform the air blowing properly, if the blades 262 rotate in

the same direction.

In order prevent this, there are gears 281 and 282 engaged with each other

between the second fan 250 and the motor 280 for changing a rotation direction, which

are coupled to a rotation shaft of the motor 280 and the rotation shaft of the second fan

250, respectively.

Of course, it is apparent that the gears 281, and 282 can be provided between

the first fan 240 and the motor 280.

In the embodiment, the heat exchanger 200a has one end connected to the guide

wall 238 and the other end connected to an inside wall of the cabinet 230 opposite to the

guide wall 238, for form an "1" shape.

Next, referring to FIG. 8, in the fourth embodiment ventilating arid heat

exchanging unit 200c of the present invention, a first fan 240 and a second fan 250 are

coupled to a rotation shaft of a motor 280 mounted passed through a guide wall 238.

However, a double suction sirocco fan of the first fan 240 and a double suction

sirocco fan of the second fan 250 are mounted in a state symmetry with reference to a

point. Therefore, unlike the third embodiment ventilating and heat exchanging unit 200b,

no gears are required.

Since other configurations are identical to the first embodiment ventilating and

heat exchanging unit 200, description of which will be omitted.

Next, a fifth embodiment ventilating and heat exchanging unit of the present

invention will be described, with reference to FIGS. 9, 1 OA, and 1 OB.

Referring to FIG. 9, the fifth embodiment ventilating and heat exchanging unit

of the present invention includes a first fan 240a having at least one X-fan, and a second

fan 250a having at least on X-fan.

In this instance, functions and positions of the first fan 240a and the second fan

250a are identical to the first embodiment ventilating and heat exchanging unit.

Referring to FIGS. 1OA and 1OB, the first fan 240a and the second fan 250a

each includes an X-fan assembly having at least one X-fan 280.

In the embodiment, the X-fan assembly has a multi-staged structure in which a

plurality of fans air coupled in an axial direction.

In more detail, the X-fan 280 includes a rotation shaft 281 rotataβly coupled to

a driving motor (not shown), a cylindrical hub 282, a cylindrical hub fixedly secured to

end portions of the rotating shaft 281, and blades 283 formed on an outside

circumferential surface of the hub 282 in a helix. When seen from a side, the X-fan

assembly has a shape of 'X'.

The hub 282 is hollow, and has opened inlet and outlet, and four arms 284 in

the hollow of the hub 282 at 90° intervals in a circumferential direction for joining with

a rotating shaft 281 and securing supporting strength.

Alternatively, instead of the arms 284 in the hub 282, helical supplementary

blades may be formed, for blowing air through the inside of the hub 282, too.

The blades 283 have a semicircular section, substantially. When seen in a

rotation shaft direction, the blades 283 have no area overlapped with each other, for

permitting injection molding with upper, and lower molds.

Accordingly, in injection molding of the fan of the present invention, a partition

line 285 is formed on an outside circumferential surface of the hub 282 by the upper,

and lower molds, which connects an inlet of a blade 283 to an outlet of an adjacent

blade 283.

It is favorable that the blade 283 has a thickness, not constant, but thicker than

an outer tip in a radial direction as the blade is the nearer to the hub, because gravity

center of the blade 283 can be induced inwardly, to reduce moment generated when the

fan rotates, which reduces vibration.

Moreover, when the blade 283 is curved with a predetermined radius of

curvature, it is preferable that the radius of curvature at the inlet is greater than the

radius of curvature at the outlet, because air entrance at the inlet becomes smooth, and

the air is accumulated before discharged at the outlet to raise a static pressure of the air

' being discharged.

In the meantime, taking small spaces for mounting the first fan 240a and the

second fan 250a into account, while an axial direction length of the hub 282 of the X-

fan assembly is made shorter, a number of the blades on the outside circumference of

the hub 282 may be increased to two or more than two. That is, it is preferable that use

of a multi-blade X-fan is preferable, which has a plurality of blades on the outside

circumferential surface of the hub 282.

In the meantime, there may be a supplementary fan 250b in the second outlet

234, for enhancing air flowing power of the air discharged to an outside of the room.

The supplementary fan 250b may be provided between the first flow passage and the

second damper 214.

Though not shown, there may be an additional supplementary fan 250b on one

side of the second inlet 233, or between the second flow passage and the first damper

too, for enhancing air blowing power of the air introduced into the room.

It will be apparent to those skilled in the art that various modifications and

variations can be made in the present invention without' departing from the spirit or

scope of the invention. Thus, it is intended that the present invention cover the

modifications and variations of this invention provided they come within the scope of

the appended claims and their equivalents.

Industrial Applicability

As has been described, the ventilating and heat exchanging unit of the present

invention has the following advantages.

First, the ventilating and heat exchanging unit can provide a comfortable

environment to a room resident, because, as described before, the ventilating and heat

exchanging unit has, not only room cooling and heating function, but also a room

ventilating function,

Second, the regenerative heat exchanger for minimizing a heat loss during

ventilation and the heat exchanger for room cooling and heating mounted in one cabinet

of the ventilating and heat exchanging unit permits easy installation compared to a case

when the regenerative heat exchanger is mounted separately.

Third, the ventilating and heat exchanging unit can maintain a room

environment in an optimum state as the ventilating and heat exchanging unit can be

operated in a room air circulating mode, a partial ventilating mode, and a total

ventilating mode.

Fourth, the first fan and the second fan, of which air discharge static pressure

maximized, in the ventilating and heat exchanging unit improve air blowing

performance.

Fifth, the partition in the fan for splitting air re-circulating to the room, and air

discharged to an outside of the room at a predetermined ratio permits to maintain a level

of ventilation appropriately in the ventilation of the room, to prevent excessive heat loss.

Sixth, the first fan and the second fan driven by one motor permits to simplify a

structure, improve productivity, and a degree of an inside space utilization of the cabinet.

Seventh, the possibility of installation of the ventilating and heat exchanging

unit of the present invention on a ceiling of a veranda improves a degree of room space

utilization, and simple to install without requirement for burying in a ceiling of room.