WO2023074500A1

WO2023074500A1 - Ventilation device

Info

Publication number: WO2023074500A1
Application number: PCT/JP2022/038964
Authority: WO
Inventors: 政典池部
Original assignee: ダイキン工業株式会社
Priority date: 2021-10-29
Filing date: 2022-10-19
Publication date: 2023-05-04
Also published as: JP7415182B2; JP2023066701A

Abstract

An air supply fan (30) and an exhaust fan (40) are centrifugal fans, the respective axes of rotation of which are along a first direction orthogonal to a lower surface (12b) of a casing (12). A first heat exchanger (21), the air supply fan (30), and a second heat exchanger (52) are aligned in a second direction along the lower surface (12b) of the casing (12). When viewed from the first direction, the exhaust fan (40) is arranged overlapping the air supply fan (30).

Description

ventilator

This disclosure relates to a ventilation device.

The ventilation device disclosed in Patent Document 1 includes an air supply fan, an exhaust fan, a first heat exchanger (total heat exchange element), and a second heat exchanger (indoor heat exchanger). When the air supply fan and the exhaust fan are operated, heat is exchanged between the indoor air and the outdoor air in the first heat exchanger. The outdoor air heat-exchanged by the first heat exchanger is cooled or heated by the second heat exchanger and then supplied indoors. The indoor air heat-exchanged in the first heat exchanger is discharged outdoors.

JP 2011-75117 A

In the ventilation device disclosed in Patent Document 1, an exhaust fan, a first heat exchanger, an air supply fan, and a second heat exchanger are arranged side by side along the lower surface of the casing. Therefore, there is a problem that the ventilator is enlarged in the direction in which they are arranged.

The purpose of the present disclosure is to downsize the ventilator.

A first aspect comprises a casing (12) in which an air supply path (13) for supplying outdoor air to the room and an exhaust path (14) for discharging the indoor air to the outside are formed, and the air supply path (13). ), an exhaust fan (40) for transporting air in the exhaust passage (14), air flowing in the air supply passage (13) and the exhaust passage (14). a first heat exchanger (21) that exchanges heat with flowing air; and a second heat exchanger (52) arranged downstream of the first heat exchanger (21) in the air supply path (13). wherein the air supply fan (30) and the exhaust fan (40) are centrifugal fans each rotating in a first direction orthogonal to the lower surface (12b) of the casing, and the first heat exchange The unit (21), the air supply fan (30), and the second heat exchanger (52) are arranged in a second direction along the lower surface (12b) of the casing (12), and the exhaust fan ( 40) is a ventilator arranged to overlap with the air supply fan (30) when viewed from the first direction.

In the first aspect, the first heat exchanger (21), the air supply fan (30), and the second heat exchanger (52) are arranged in the second direction along the lower surface (12b) of the casing (12), Moreover, the air supply fan (30) and the exhaust fan (40) overlap in the first direction perpendicular to the bottom surface (12b). With this configuration, the casing (12) can be made smaller in the second direction than the configuration in which the exhaust fan, the first heat exchanger, the air supply fan, and the second heat exchanger are arranged in the second direction.

Since the air supply fan (30) and the exhaust fan (40) are so-called horizontal type centrifugal fans with their rotating shafts along the first direction, the air supply fan (30) and the exhaust fan (40) are arranged in the first direction. Even if it overlaps in the direction, it can suppress that a casing (12) becomes large in a 1st direction.

In a second aspect, in the first aspect, all of the first heat exchanger (21), the air supply fan (30), and the second heat exchanger (52) are overlap each other when

In the second aspect, the casing (12) can be made smaller in the horizontal direction perpendicular to the second direction and in the vertical direction.

In a third aspect, in the first or second aspect, the first heat exchanger (21) and the exhaust fan (40) overlap each other when viewed from the second direction.

In the third aspect, the casing (12) can be made smaller in the horizontal direction perpendicular to the second direction and in the vertical direction.

A fourth aspect is any one of the first to third aspects, wherein the upper end of the second heat exchanger (52) is higher than the upper end of the first heat exchanger (21), The exhaust path (14) includes a first flow path (24) formed above the first heat exchanger (21).

In the fourth aspect, since the upper end of the second heat exchanger (52) is higher than the upper end of the first heat exchanger (21), the vertical height of the second heat exchanger (52) can be increased. Thereby, the heat transfer area of the second heat exchanger (52) can be increased. On the other hand, since the upper end of the second heat exchanger (52) is lower than the upper end of the first heat exchanger (21), the upper side of the second heat exchanger (52) is part of the exhaust passage (14). The first flow path (24) can be secured.

According to a fifth aspect, in any one of the first to fourth aspects, a drain pan (64) is arranged below the second heat exchanger (52), and the air supply fan (30) is , the air supply path (13) is formed below the air supply fan (30) and adjacent to the drain pan (64) in the second direction. and a second flow path (35) communicating with the suction port (36) of the air supply fan (30).

In the fifth aspect, the space formed at a position adjacent to the drain pan (64) by providing the drain pan (64) is the second space in the air supply passage (13) located on the suction side of the air supply fan (30). It can be used as two flow paths (35).

In a sixth aspect, in any one of the first to fifth aspects, the air supply fan (30) is arranged below the exhaust fan (40), and the upper end of the air supply fan (30) is higher than the half height position in the first direction in the casing (12), and the air supply passage (13) is formed below the air supply fan (30) and the air supply fan (30). It includes a second flow path (35) communicating with the suction port (36) of the air fan (30).

In the sixth aspect, the upper end of the air supply fan (30) is higher than the half height position of the casing (12) in the first direction, so that the air supply fan (30) in the air supply passage (13) is The second flow path (35) located on the suction side of the can be sufficiently secured. As a result, the flow path resistance of the second flow path (35) can be reduced, thereby reducing the load on the air supply fan (30).

A seventh aspect, in any one of the first to sixth aspects, is provided with a generator (74) arranged in the air supply path (13) to generate active species in the air.

In the seventh aspect, the active species generated by the generator (74) can be supplied to the indoor space via the air supply path (13).

In an eighth aspect, in any one of the first to seventh aspects, the air supply fan (30) has an air outlet (37) facing the second heat exchanger (52) and the second heat exchanger (52). It extends in the longitudinal direction of the exchanger (52).

In the eighth aspect, the air blown out from the outlet (37) of the air supply fan (30) can be prevented from locally flowing through a part of the second heat exchanger (52).

FIG. 1 is a schematic configuration diagram of a building in which a ventilation system of an embodiment is installed. FIG. 2 is a schematic configuration diagram of a refrigerant circuit of a ventilator. FIG. 3 is a perspective view showing the appearance of the ventilator. FIG. 4 is a side view of the ventilator. FIG. 5 is a bottom view of the ventilator. FIG. 6 is a bottom view of the ventilator with the indoor panel removed. 7 is a cross-sectional view taken along the line VII--VII of FIG. 4. FIG. 8 is a cross-sectional view taken along line VIII--VIII of FIG. 5. FIG. 9 is a cross-sectional view taken along line IX-IX in FIG. 5. FIG. 10 is a cross-sectional view taken along line XX of FIG. 5. FIG.

Hereinafter, embodiments of the present disclosure will be described in detail with reference to the drawings. Note that the present disclosure is not limited to the embodiments shown below, and various modifications are possible without departing from the technical idea of the present disclosure. Each drawing is for the purpose of conceptually explaining the present disclosure, and therefore dimensions, ratios or numbers may be exaggerated or simplified as necessary for ease of understanding.

<<Embodiment>>
(1) Outline of ventilator The ventilator (10) of the present disclosure ventilates the indoor space (5). As shown in FIG. 1, a ventilator (10) ventilates an indoor space (5) of a building such as a general house. The ventilator (10) supplies outdoor air (OA) in the outdoor space (6) to the room as supply air (SA). At the same time, the ventilator (10) discharges indoor air (RA) in the indoor space (5) to the outside as exhaust air (EA). The “indoor space” referred to here includes a living room such as a living room and a non-living room such as a corridor. A ventilator (10) regulates the temperature of the air in the indoor space (5). The ventilator (10) performs cooling operation and heating operation.

The ventilation device (10) has a ventilation unit (11). The ventilation unit (11) is arranged in the ceiling space (8) behind the ceiling (7). The ventilation unit (11) of this example is a horizontal ventilation unit. Ventilation units (11) are arranged along the ceiling (7). As shown in FIG. 3, the ventilation unit (11) has a casing (12). The ventilation unit (11) is arranged in such a posture that the longitudinal direction of the casing (12) is substantially horizontal. As shown in FIGS. 7 and 8, the casing (12) is formed with an air supply path (13) and an exhaust path (14). The air supply path (13) is a flow path for supplying outdoor air (OA) indoors. The exhaust path (14) is a flow path for discharging indoor air (RA) to the outside of the room. The ventilation unit (11) has a supply air fan (30), an exhaust fan (40), a total heat exchanger (21) and a utilization heat exchanger (52).

As shown in FIG. 2, the ventilator (10) has a heat source unit (80). The heat source unit (80) and the heat utilization heat exchanger (52) are connected via a first communication pipe (86) and a second communication pipe (87). A refrigerant circuit (R) is configured by connecting the pipes. The refrigerant circuit (R) is filled with refrigerant. The refrigerant is, for example, R32 (difluoromethane). The refrigerant circuit (R) performs a refrigeration cycle by circulating refrigerant. The first communication pipe (86) is a gas-side communication pipe. The second communication pipe (87) is a liquid-side communication pipe.

(2) Duct As shown in FIG. 1, the ventilation unit (11) is connected to an outside air duct (D1), an exhaust duct (D2), and an air supply duct (D3). The inflow end of the outdoor air duct (D1) is connected to the outdoor space (6). The outflow end of the outside air duct (D1) is connected to the inflow end of the air supply passage (13). The inflow end of the exhaust duct (D2) is connected to the outflow end of the exhaust path (14). The outflow end of the exhaust duct (D2) is connected to the outdoor space (6). The inflow end of the air supply duct (D3) is connected to the outflow end of the air supply path (13). The outflow end of the supply air duct (D3) leads to the interior space (5).

(3) Heat Source Unit The heat source unit (80) shown in FIG. 2 is arranged in the outdoor space (6). The heat source unit (80) has a heat source fan (81) and a heat source side electric component box (88). The heat source unit (80) has a compressor (82), a heat source heat exchanger (83), a switching mechanism (84) and an expansion valve (85) as elements of the refrigerant circuit (R).

The compressor (82) compresses the sucked refrigerant. The compressor (82) discharges compressed refrigerant. The compressor (82) is of an inverter type.

The heat source heat exchanger (83) is a fin-and-tube air heat exchanger. The heat source heat exchanger (83) is an outdoor heat exchanger that exchanges heat between refrigerant flowing therein and outdoor air.

The heat source fan (81) is arranged near the heat source heat exchanger (83). The heat source fan (81) of this example is a propeller fan. The heat source fan (81) conveys air passing through the heat source heat exchanger (83).

The switching mechanism (84) changes the flow path of the refrigerant circuit (R) so as to switch between the first refrigerating cycle, which is the cooling cycle, and the second refrigerating cycle, which is the heating cycle. The switching mechanism (84) is a four-way switching valve. The switching mechanism (84) has a first port (84a), a second port (84b), a third port (84c) and a fourth port (84d). A first port (84a) of the switching mechanism (84) is connected to a discharge portion of the compressor (82). The second port (84b) of the switching mechanism (84) is connected to the suction portion of the compressor (82). The third port (84c) of the switching mechanism (84) is connected to the gas side end of the heat utilization heat exchanger (52) via the first communication pipe (86). The fourth port (84d) of the switching mechanism (84) is connected to the gas side end of the heat source heat exchanger (83).

The switching mechanism (84) switches between the first state and the second state. The switching mechanism (84) in the first state (the state indicated by the solid line in FIG. 2) communicates the first port (84a) and the fourth port (84d) and connects the second port (84b) and the third port (84c). ). The switching mechanism (84) in the second state (indicated by broken lines in FIG. 2) communicates between the first port (84a) and the third port (84c), and connects the second port (84b) and the fourth port (84d). ).

The expansion valve (85) has one end connected to the liquid side end of the heat source heat exchanger (83) and the other end connected to the liquid side end of the utilization heat exchanger (52) via the second communication pipe (87). Connect. The expansion valve (85) is an electronic expansion valve whose degree of opening is adjustable.

Electric parts are accommodated in the internal space of the heat source side electric component box (88). The electric parts include power boards, reactors, control boards, and the like. The power board includes an inverter board corresponding to the compressor (82) and the heat source fan (81). A power device is mounted on the inverter board.

(4) Details of Ventilation Unit Details of the ventilation unit (11) will be described with reference to FIGS. 3 to 9. FIG. In the following description, "up", "down", "left", "right", "front", and "back" are directions when the ventilation unit (11) is viewed from the front. The front surface of the ventilation unit (11) is a surface on which a first duct connection portion (C1) and a second duct connection portion (C2), which will be described later, are provided.

The ventilation unit (11) includes a casing (12), a total heat exchanger unit (20), a fan unit (F), a utilization heat exchanger unit (50), and a utilization side electrical component box (70). The internal space of the casing (12) accommodates a total heat exchanger unit (20), a fan unit (F), a utilization heat exchanger unit (50), and a utilization side electrical component box (70). The total heat exchanger unit (20), the fan unit (F), and the utilization heat exchanger unit (50) are arranged in order from front to back.

(4-1) Casing As shown in FIGS. 3 to 5, the casing (12) is shaped like a rectangular parallelepiped extending in the front-rear direction. The casing (12) is shaped like a hollow box. The casing (12) has an upper plate (12a) and a lower plate (12b) facing each other in the vertical direction, and four side plates. The four side plates are composed of a front side plate (12c) and a rear side plate (12d) facing each other in the front-rear direction, and a right side plate (12e) and a left side plate (12f) facing each other in the left-right direction.

The upper plate (12a) constitutes the upper surface of the casing (12). The lower plate (12b) constitutes the lower surface of the casing (12). The front plate (12c) constitutes the front side surface of the casing (12). The rear plate (12d) constitutes the rear side surface of the casing (12). The right side plate (12e) constitutes the right side surface of the casing (12). The left side plate (12f) constitutes the left side surface of the casing (12). The upper plate (12a) and the lower plate (12b) extend substantially horizontally. The front plate (12c) and the rear plate (12d) extend substantially vertically.

As shown in FIG. 7, the front side duct fixing member (17) is provided on the back side of the front side plate (12c). The front duct fixing member (17) is arranged at the front end inside the casing (12). The front duct fixing member (17) includes a rectangular parallelepiped main body portion, and tubular first duct connection portion (C1) and second duct connection portion (C2) protruding forward from the front surface of the main body portion. have The front duct fixing member (17) is provided with one first duct connection portion (C1) and one second duct connection portion (C2). The first duct connection portion (C1) and the second duct connection portion (C2) pass through the front plate (12c) and are exposed to the outside of the casing (12). An outflow end of an outside air duct (D1) is connected to the first duct connection portion (C1). The inflow end of the exhaust duct (D2) is connected to the second duct connection (C2).

As shown in FIG. 7, an outside air intake port (o1) is formed inside the first duct connection portion (C1). An exhaust port (o2) is formed inside the second duct connection portion (C2). In other words, the front side surface of the casing (12) is formed with an outside air intake port (o1) and an exhaust port (o2). The outdoor air intake port (o1) is an opening for introducing outdoor air into the air supply passage (13). The exhaust port (o2) is an opening for discharging the air in the exhaust passage (14) to the outside of the room. The outside air intake port (o1) is located closer to the center in the left-right direction of the front plate (12c) than the exhaust port (o2).

A rear duct fixing member (18) is provided on the back side of the rear plate (12d). The rear duct fixing member (18) is arranged at the rear end inside the casing (12). The rear duct fixing member (18) has a rectangular parallelepiped main body and a tubular third duct connection part (C3) projecting rearward from the rear surface of the main body. The rear duct fixing member (18) is provided with five third duct connections (C3).

The third duct connection portion (C3) penetrates the rear plate (12d) and is exposed to the outside of the casing (12). The inflow end of the air supply duct (D3) is connected to the third duct connection (C3). It should be noted that the numbers of the first duct connection (C1), the second duct connection (C2), and the third duct connection (C3) shown here are merely examples. In FIG. 1, only one air supply duct (D3) is shown for convenience.

An air supply port (o3) is formed inside the third duct connection part (C3). The air supply port (o3) is an opening for supplying the air in the air supply path (13) to the indoor space.

As shown in FIG. 6, an inspection opening (19) is formed in the lower surface of the casing (12). The inspection opening (19) is provided for inspecting the parts housed in the internal space of the casing (12). The inspection opening (19) is formed in front of the lower plate (12b) of the casing (12). The inspection port (19) communicates with the internal space of the casing (12). The access door (19) corresponds to the opening of the present disclosure.

As shown in Fig. 5, an interior panel (15) is provided below the inspection opening (19). The indoor panel (15) is arranged so as to cover the entire inspection opening (19). As schematically shown in FIG. 1, the interior panel (15) is provided in a ceiling opening (7a) passing through the ceiling (7). The interior panel (15) faces the interior space (5). The interior panel (15) is fixed to the casing (12) by fastening members (for example, bolts). The interior panel (15) is configured to be removable.

The interior panel (15) has an outer panel (15a) and an inner panel (15b). The outer panel (15a) is flat. An inside air intake port (15c) is formed in the front portion of the outer panel (15a). The inside air intake port (15c) is formed in a rectangular shape with long sides extending in the left-right direction. The inside air intake port (15c) is an opening for sucking in room air. The inside air intake port (15c) allows the indoor space (5) and the inflow end of the exhaust passage (14) to communicate with each other.

The inner panel (15b) is laid over the outer panel (15a). Three openings are formed in the inner panel (15b). The first opening (15d) is formed in the front portion of the inner panel (15b). The first opening (15d) is formed at a position vertically overlapping the inside air inlet (15c) of the outer panel (15a). The first opening (15d) is formed in a rectangular shape with long sides extending in the horizontal direction. The first opening (15d) is formed at a position vertically overlapping a filter (23) described later.

The second opening (15e) is formed behind the first opening (15d) in the inner panel (15b). The second opening (15e) is formed in a rectangular shape with long sides extending in the left-right direction. The second opening (15e) is formed at a position vertically overlapping a total heat exchanger (21) described later. The third opening (15f) is formed to the right of the first opening (15d) and the second opening (15e) in the inner panel (15b). The third opening (15f) is formed in a rectangular shape with long sides extending in the front-rear direction. The third opening (15f) is formed at a position vertically overlapping the user side electrical component box (70).

As shown in FIG. 8, a panel space (16), which is a small vertical space, is formed between the inner panel (15b) and the outer panel (15a). Room air that has flowed in through the inside air intake port (15c) flows into the total heat exchanger (21) via the panel space (16) and the second opening (15e).

(4-2) Total heat exchanger unit The total heat exchanger unit (20) is arranged on the front side in the internal space of the casing (12). The total heat exchanger unit (20) is arranged adjacently to the rear of the front side duct fixing member (17). The total heat exchanger unit (20) is arranged above the inspection port (19). The total heat exchanger unit (20) has a first housing (22), a total heat exchanger (21), and a filter (23). The first accommodation portion (22) accommodates a total heat exchanger (21) and a filter (23).

(4-2-1) First Receiving Part The first receptacle part (22) is formed in a hollow, substantially rectangular parallelepiped shape. The vertical length of the first accommodation portion (22) is substantially the same as the vertical length of the internal space of the casing (12). The first accommodation portion (22) has an open bottom surface. The first accommodation portion (22) is made of foamed polystyrene.

(4-2-2) Total Heat Exchanger The total heat exchanger (21) corresponds to the first heat exchanger of the present disclosure. The total enthalpy heat exchanger (21) is housed on the rear side inside the first housing portion (22). The total heat exchanger (21) exchanges heat between air flowing through the air supply passage (13) and air flowing through the exhaust passage (14). As schematically shown in FIG. 8, a supply side internal flow path (21a) and an exhaust side internal flow path (21b) are formed inside the total heat exchanger (21). The air supply side internal flow path (21a) and the exhaust side internal flow path (21b) are orthogonal to each other.

The total heat exchanger (21) is arranged such that the inflow surface of the exhaust-side internal flow path (21b) is along the opening surface of the internal air intake port (15c). The air flowing through the exhaust-side internal flow path (21b) flows from bottom to top. In other words, the air flowing through the exhaust-side internal flow path (21b) flows substantially vertically. The air flowing through the air supply side internal channel (21a) flows from front to rear. The air flowing through the air supply side internal flow path (21a) flows substantially horizontally.

The total heat exchanger (21) transfers heat between the air in the air supply side internal flow path (21a) and the air in the exhaust side internal flow path (21b). The total heat exchanger (21) moves moisture between the air in the air supply side internal flow path (21a) and the air in the exhaust side internal flow path (21b). Thus, the total heat exchanger (21) exchanges latent heat and sensible heat between the air in the supply side internal flow path (21a) and the air in the exhaust side internal flow path (21b).

A total heat exchange upper space (24) is formed between the total heat exchanger (21) and the upper surface of the first accommodation portion (22). The total heat exchange upper space (24) is formed above the total heat exchanger (21). Air that has passed through the exhaust-side internal flow path (21b) of the total heat exchanger (21) flows into the total heat exchange upper space (24).

(4-2-3) Filter As shown in FIG. 8, the filter (23) is arranged in front of the total heat exchanger (21) inside the first accommodation section (22). The filter (23) is arranged upstream of the total heat exchanger (21) in the air supply path (13). The filter (23) collects dust in outdoor air (OA).

(4-2-4) First Inlet, Second Inlet A substantially rectangular first inlet (25) is formed in the front side surface of the first storage portion (22). The first inlet (25) communicates with the internal space of the first accommodation portion (22). The first inlet (25) communicates with the outside air duct (D1) via the first duct connection portion (C1) of the front duct fixing member (17). The outdoor air that has flowed into the first inlet (25) passes through the filter (23) and flows into the air supply side internal flow path (21a) of the total heat exchanger (21).

The inner panel (15b) of the interior panel (15) is arranged on the lower surface of the first housing portion (22). The second opening (15e) of the inner panel (15b) constitutes the second inlet (26) of the first accommodation portion (22). The second inlet (26) communicates with the internal space of the first accommodation portion (22). The second inlet (26) communicates with the inside air inlet (15c) of the outer panel (15a) through the panel space (16). The room air that has flowed into the second inlet (26) flows into the exhaust-side internal flow path (21b) of the total heat exchanger (21).

(4-3) Fan Unit As shown in FIGS. 7 and 8, the fan unit (F) is arranged adjacently behind the total heat exchanger unit (20) in the internal space of the casing (12). The fan unit (F) is arranged above the lower plate (12b). The fan unit (F) is formed in a substantially rectangular parallelepiped shape extending in the left-right direction. The vertical length of the fan unit (F) is substantially the same as the vertical length of the internal space of the casing (12). A part of the right side surface of the fan unit (F) protrudes rightward. An opening is formed at the front end of the fan unit (F). The rear end of the total heat exchanger (21) is inserted into this opening.

The fan unit (F) has an air supply fan (30) and an exhaust fan (40). In the fan unit (F), the air supply fan (30) and the exhaust fan (40) are arranged to overlap each other in the vertical direction. The exhaust fan (40) is arranged above the air supply fan (30).

(4-3-1) Exhaust Fan The exhaust fan (40) conveys the air in the exhaust passage (14). The exhaust fan (40) includes an exhaust side housing (41), a first impeller (42) housed in the exhaust side housing (41), and a first motor (M1) for rotating the first impeller (42). and

The exhaust-side housing (41) is made of resin. The exhaust side housing (41) is formed in a substantially rectangular parallelepiped shape that is vertically thin. A first partition (41a) is formed in the upper portion of the exhaust-side housing (41). The first partition (41a) is divided into an exhaust side suction space (44) formed in the upper portion of the exhaust side housing (41) and an exhaust fan accommodation space (43) formed in the lower portion of the exhaust side housing (41). divide the The exhaust side suction space (44) is a substantially rectangular parallelepiped space. The exhaust side suction space (44) communicates with the total heat exchange upper space (24). A first impeller (42) is arranged in the exhaust fan accommodation space (43). The exhaust fan housing space (43) is a substantially cylindrical space.

The first partition (41a) is formed with a first suction port (45) vertically penetrating the first partition (41a). The first suction port (45) communicates the exhaust side suction space (44) with the exhaust fan accommodation space (43).

The exhaust fan (40) is arranged in the exhaust path (14). The exhaust fan (40) is a sirocco-type centrifugal fan. The exhaust fan (40) is of a horizontal type with its rotation axis arranged along the vertical direction. The exhaust fan (40) may be a turbo-type centrifugal fan.

The first impeller (42) is driven by the first motor (M1). The first motor (M1) is fixed to the lower surface of the exhaust-side housing (41). The rotation speed of the first motor (M1) is variable. The first motor (M1) is a regulated DC fan motor. The exhaust fan (40) is configured to have a variable air volume.

A second partition (41b) is formed in the front portion of the first partition (41a) of the exhaust-side housing (41). The second partition (41b) includes an exhaust side suction space (44) formed above the second partition (41b) and an introduction space (G) formed below the second partition (41b). divide the The introduction space (G) is formed between the front end of the fan unit (F) and the outflow surface of the air supply side internal flow path (21a) in the total heat exchanger (21).

An exhaust-side outlet (48) is formed on the left side of the inflow surface of the exhaust-side suction space (44) in the exhaust-side housing (41). The exhaust-side outlet (48) is a substantially rectangular opening elongated in the vertical direction. The exhaust side outlet (48) communicates with the exhaust fan accommodation space (43) via an exhaust side relay passageway (47) extending from the left side of the exhaust fan accommodation space (43).

(4-3-2) Air Supply Fan The air supply fan (30) conveys the air in the air supply passage (13). The air supply fan (30) includes an air supply side housing (31), a second impeller (32) housed in the air supply side housing (31), and a second motor for rotating the second impeller (32). (M2) and

The air supply side housing (31) is made of resin. The air supply side housing (31) is formed in a substantially rectangular parallelepiped shape that is vertically thin. The air supply side housing (31) is fastened to the exhaust side housing (41) via a fastening member. The air supply side housing (31) has the same outer shape as the exhaust side housing (41) when viewed from above. The vertical length of the air supply side housing (31) is greater than the vertical length of the exhaust side housing (41). In other words, the upper end of the air supply side housing (31) is located above the vertical center of the casing (12).

A third partition (33) is formed in the lower portion of the air supply side housing (31). The third partition (33) comprises an air supply fan accommodation space (34) formed in the upper part of the air supply side housing (31) and an air supply side suction space formed in the lower part of the air supply side housing (31). (35) separates the The air supply side suction space (35) is a substantially rectangular parallelepiped space. The air supply side suction space (35) communicates with the introduction space (G). A second impeller (32) is arranged in the air supply fan accommodation space (34). The air supply fan accommodation space (34) is a substantially cylindrical space.

The third partition (33) is formed with a second suction port (36) vertically penetrating the third partition (33). The second suction port (36) communicates the air supply side suction space (35) with the air supply fan accommodation space (34). The vertical length of the air supply side suction space (35) is longer than the vertical length of the exhaust side suction space (44).

The air supply fan (30) is arranged in the air supply path (13). The air supply fan (30) is a sirocco-type centrifugal fan. The air supply fan (30) is of a horizontal type with its rotating shaft arranged along the vertical direction. The rotating shaft of the second impeller (32) is not positioned to vertically overlap the rotating shaft of the first impeller (42). The rotation shaft of the second impeller (32) is arranged rearward and to the right of the rotation shaft of the first impeller (42). The air supply fan (30) may be a turbo-type centrifugal fan.

The second impeller (32) is driven by the second motor (M2). The second motor (M2) is fixed to the upper surface of the air supply side housing (31). The rotation speed of the second motor (M2) is variable. The second motor (M2) is a regulated DC fan motor. The air supply fan (30) is configured to have a variable air volume.

An air supply side outlet (37) is formed on the left side of the rear side surface of the air supply side housing (31). The air supply side outlet (37) is a substantially rectangular opening with long sides extending in the left-right direction. The air supply side outlet (37) communicates with the air supply fan accommodation space (34) via an air supply side relay passage (not shown) extending from the left side of the air supply fan accommodation space (34).

(4-4) Utilization heat exchanger unit The utilization heat exchanger unit (50) is arranged adjacently behind the fan unit (F) in the internal space of the casing (12). A utilization heat exchanger unit (50) is arranged between the fan unit (F) and the rear duct fixing member (18). The utilization heat exchanger unit (50) is arranged above the lower plate (12b). The utilization heat exchanger unit (50) has a second housing (51), a utilization heat exchanger (52), a pump (60), a drain pipe (62), and refrigerant pipes (56, 58). The second housing portion (51) houses a heat utilization heat exchanger (52), a pump (60), a drain pipe (62), and refrigerant pipes (56, 58).

(4-4-1) Second accommodation portion The second accommodation portion (51) is formed in a substantially L-shaped box shape. The upper surface of the second accommodation portion (51) is formed in a substantially L shape. The upper surface of the second accommodation portion (51) extends rearward and then leftward. The second accommodation portion (51) has an open bottom surface. The lateral length of the second accommodation portion (51) is substantially the same as the lateral length of the internal space of the casing (12). The second housing portion (51) is made of resin. A drain pan (64), which will be described later, is arranged below the second housing portion (51).

A space surrounded by the second storage section (51) and the drain pan (64) is a heat exchanger in which a first heat exchange section (52a) and a second heat exchange section (52b) of a heat utilization heat exchanger (52) described later are arranged. It is divided into a replacement part accommodation space (54) and a piping space (55) in which a pump (60), a drain pipe (62), and refrigerant pipes (56, 58) are arranged. The piping space (55) is formed from the front end to the rear end on the right side of the second housing portion (51). The heat exchanging portion accommodation space (54) is a portion of the second accommodation portion (51) other than the piping space (55).

(4-4-2) Utilization heat exchanger The utilization heat exchanger (52) corresponds to the second heat exchanger of the present disclosure. The utilization heat exchanger (52) is arranged downstream of the total heat exchanger (21) in the air supply path (13). The utilization heat exchanger (52) has a first heat exchange section (52a), a second heat exchange section (52b), and a pressure reducing valve (52c). As shown in FIG. 2, the first heat exchange section (52a) and the second heat exchange section (52b) are connected via a refrigerant pipe provided with a pressure reducing valve (52c).

The first heat exchange section (52a) and the second heat exchange section (52b) exchange heat between the refrigerant flowing therein and the air flowing in the air supply passage (13). The first heat exchange section (52a) and the second heat exchange section (52b) are fin-and-tube air heat exchangers. As shown in FIG. 7, the first heat exchange section (52a) and the second heat exchange section (52b) have a large number of fins (not shown) and heat transfer tubes (53). The heat transfer tube (53) extends in the direction in which the numerous fins are arranged. Refrigerant flows inside the heat transfer tube (53). The first heat exchanging part (52a) is composed of the front part of the fins, and the second heat exchanging part (52b) is composed of the rear part of the fins.

The first heat exchange section (52a) and the second heat exchange section (52b) are arranged to extend along the vertical direction. The upper portions of the first heat exchange portion (52a) and the second heat exchange portion (52b) are supported on the upper surface of the second housing portion (51). Lower portions of the first heat exchange section (52a) and the second heat exchange section (52b) are supported by the drain pan (64).

The pressure reducing valve (52c) reduces the pressure of the refrigerant. The pressure reducing valve (52c) is an electronic expansion valve whose degree of opening is adjustable. The pressure reducing valve (52c) may be a solenoid valve. When the pressure reducing valve (52c) is a solenoid valve, the pressure reducing valve (52c) switches between a fully open state and a state where the degree of opening is reduced so as to reduce the pressure of the refrigerant. The pressure reducing valve (52c) is arranged in the central portion of the piping space (55).

(4-4-3) Refrigerant Piping One end of a first refrigerant pipe (56) is connected to the first heat exchange section (52a). One end of the first communication pipe (86) is connected to the other end of the first refrigerant pipe (56) via the first refrigerant pipe connector (57). One end of the second refrigerant pipe (58) is connected to the second heat exchange portion (52b). One end of the second communication pipe (87) is connected to the other end of the second refrigerant pipe (58) via the second refrigerant pipe connector (59).

The first refrigerant pipe (56) and the second refrigerant pipe (58) are arranged in the pipe space (55). The first refrigerant pipe (56) and the second refrigerant pipe (58) extend from the corresponding heat exchange portions (52a, 52b) toward the rear end of the second accommodation portion (51).

The first refrigerant pipe connection portion (57) and the second refrigerant pipe connection portion (59) pass through the rear side surface of the second housing portion (51) and the rear side surface of the casing (12) to extend to the outside of the casing (12). extends to The first refrigerant pipe connection portion (57) and the second refrigerant pipe connection portion (59) are fixed to the rear side surface of the second housing portion (51). In other words, the first refrigerant pipe connection portion (57) and the second refrigerant pipe connection portion (59) protrude rearward from the rear side surface of the second housing portion (51). The first refrigerant pipe connection (57) is arranged above and to the right of the second refrigerant pipe connection (59). The first refrigerant pipe connection portion (57) and the second refrigerant pipe connection portion (59) are arranged below the drain pipe connection portion (63).

(4-4-4) Pump and Drainage Pipe As shown in FIG. 7, the pump (60) is arranged in the piping space (55) of the second storage section (51). The pump (60) is arranged in front of the pressure reducing valve (52c) in the piping space (55). The pump (60) is arranged above the drain pan (64). The pump (60) is arranged on the right side of the fan unit (F). The pump (60) sucks up water in the drain pan (64) from its lower part.

A float switch (61) is arranged on the right side of the pump (60). A float switch (61) detects the water level in the drain pan (64). The pump (60) is controlled based on the water level detected by the float switch (61).

A drain pipe (62) is connected to the pump (60). The drain pipe (62) is arranged in the piping space (55). The drain pipe (62) extends from the pump (60) toward the rear end of the second housing (51). The drain pipe (62) is connected to a drain pipe connector (63) provided on the rear side surface of the second housing portion (51). The drain pipe connection portion (63) extends outside the casing (12) through the rear side surface of the second housing portion (51) and the rear side surface of the casing (12). The drain pipe connection portion (63) is fixed to the rear side surface of the second housing portion (51). The drain pipe connection (63) is arranged above the pump (60).

When the pump (60) is operated, the water accumulated in the drain pan (64) is sucked from the lower part of the pump (60) and flows through the drain pipe (62) and the drain pipe connection (63) to the casing (12). is discharged to the outside of the

(4-4-5) Inlet and Outlet In front of the first heat exchange section (52a) in the second storage section (51), there is a substantially rectangular inlet (51a) with long sides extending in the horizontal direction. It is formed. The entire first heat exchange section (52a) is exposed from the inlet (51a) of the second accommodation section (51). The inlet (51a) of the second accommodation portion (51) overlaps with the air supply outlet (37) of the fan unit (F) in the front-rear direction.

A substantially rectangular outflow port (51b) having a long side in the left-right direction is formed behind the second heat exchange portion (52b) in the second housing portion (51). The entire second heat exchanging portion (52b) is exposed from the outflow port (51b) of the second accommodating portion (51).

(4-5) Drain Pan The ventilation unit (11) has a drain pan (64). As shown in FIG. 8, the drain pan (64) is arranged on the lower plate (12b) of the casing (12). The drain pan (64) is arranged below the utilization heat exchanger unit (50) and closes the bottom of the utilization heat exchanger unit (50).

The drain pan (64) is shaped like a dish with an open top. The drain pan (64) receives condensed water generated around the utilization heat exchanger (52). The drain pan (64) is L-shaped. The drain pan (64) extends leftward after extending rearward. The drain pan (64) vertically overlaps the second accommodation portion (51).

(4-6) User Side Electrical Component Box The user side electrical component box (70) is arranged along the right side surface of the casing (12). The usage-side electrical component box (70) is arranged near the front side surface of the casing (12). The utilization side electrical component box (70) is arranged on the right side of the total heat exchanger unit (20). Electrical components (not shown) are accommodated in the internal space of the user-side electrical component box (70). Electrical components include power boards, control boards, and the like.

The user-side electrical component box (70) is connected to the heat source-side electrical component box (88) of the heat source unit (80), which will be described later, via a connection line (W). The communication line (W) passes through a through hole (H) formed in the front plate (12c) of the casing (12). The through hole (H) is formed in the front plate (12c) of the casing (12) at the lower right side of the first duct connection (C1).

(4-7) Exhaust guide The ventilation unit (11) has an exhaust guide (14a). The exhaust guide (14a) is a member for guiding the air blown out from the exhaust fan (40) to the second duct connection portion (C2). The exhaust guide (14a) connects the exhaust side outlet (48) of the fan unit (F) and the second duct connection portion (C2) of the front duct fixing member (17). The exhaust guide (14a) is arranged along the left side plate (12f) of the casing (12). The exhaust guide (14a) is arranged to face the user-side electrical component box (70) with the total heat exchanger unit (20) interposed therebetween.

The exhaust guide (14a) is formed in a U shape with an open right side. As shown in FIG. 9, the lower surface of the exhaust guide (14a) approaches the lower surface of the casing (12) toward the second duct connection portion (C2). In other words, the lower surface of the exhaust guide (14a) slopes downward.

(4-8) Air supply path and exhaust path (4-8-1) Air supply path a first air supply passage (S1), a second air supply passage (S2) that is a passage downstream of the total heat exchanger (21), and an air supply side internal passage of the total heat exchanger (21) (21a) and The air flowing through the air supply path (13) flows in order of the first air supply path (S1), the air supply side internal path (21a) of the total heat exchanger (21), and the second air supply path (S2). .

The first air supply passageway (S1) flows from the inflow end of the first duct connection (C1) through the first inflow port (25) of the first accommodation section (22) and the filter (23) to the total heat It is a flow path to the front side (inflow side) of the exchanger (21).

The second air supply path (S2) flows from the rear side (outflow surface) of the total heat exchanger (21) via the air supply fan (30) and the heat utilization heat exchanger (52) to the third duct connection portion. This is the flow path to the outflow end of (C3). Specifically, the air flowing through the second air supply channel (S2) flows into the intake space (G) from the rear side surface of the total heat exchanger (21) and then into the intake space (35). The air that has flowed into the air supply side suction space (35) is drawn into the second impeller (32) through the second suction port (36).

The air sucked into the second impeller (32) passes through the air supply side outlet (37) of the air supply side housing (31) and flows through the inlet (51a) of the second housing (51). flows into the second housing portion (51). The air that has flowed into the second accommodation portion (51) passes through the first heat exchange portion (52a) and the second heat exchange portion (52b) of the heat utilization heat exchanger (52) in order, and reaches the second accommodation portion (51). ) out of the outlet (51b). The air that has flowed out of the second accommodation portion (51) flows into the rear duct fixing member (18), and flows out of the ventilation unit (11) from the outflow end of the third duct connection portion (C3).

(4-8-2) Exhaust path The exhaust path (14) includes a first exhaust path (E1), which is a flow path on the upstream side of the total heat exchanger (21) in the exhaust path (14), and a total heat exchange flow path (E1). A second exhaust passage (E2), which is a passage on the downstream side of the unit (21), and an exhaust-side internal passage (21b) of the total heat exchanger (21). The air flowing through the exhaust passageway (14) flows through the first exhaust passageway (E1), the exhaust-side internal passageway (21b) of the total heat exchanger (21), and the second exhaust passageway (E2) in this order.

The first exhaust flow path (E1) is a flow path from the inside air intake port (15c) of the indoor panel (15) to the lower surface (inflow surface) of the total heat exchanger (21). Specifically, the first exhaust flow path (E1) includes the inside air intake port (15c) of the outer panel (15a), the panel space (16), the second opening (15e) of the inner panel (15b), and the total heat exchange opening (15e). It extends over the lower surface of the vessel (21).

The second exhaust flow path (E2) extends from the upper surface (outlet surface) of the total heat exchanger (21) via the exhaust fan (40) and the exhaust guide (14a) to the second duct connection portion (C2). This is the flow path to the outflow end. Specifically, the air flowing through the second exhaust flow path (E2) flows into the total heat exchange upper space (24) from the upper surface of the total heat exchanger (21), and then flows into the exhaust side suction space (44). do. The air that has flowed into the exhaust side suction space (44) is drawn into the first impeller (42) through the first suction port (45).

The air sucked into the first impeller (42) passes through the exhaust fan housing space (43), the exhaust-side relay passage (47), and the exhaust-side outlet (48) to the exhaust guide (14a). flow into the interior of The air flowing out of the exhaust guide (14a) flows into the front duct fixing member (17) and is discharged to the outside of the ventilation unit (11) from the outflow end of the second duct connection portion (C2).

(4-9) Temperature and Humidity Sensors The ventilation unit (11) has three temperature and humidity sensors (71, 72, 73). As shown in FIGS. 3 and 7, the first temperature/humidity sensor (71) is fixed through the front plate (12c) of the casing (12). The first temperature/humidity sensor (71) is exposed to the outside of the casing (12). The first temperature/humidity sensor (71) measures the temperature and humidity outside the casing (12). The first temperature/humidity sensor (71) is arranged near the outside air intake (o1). Specifically, the first temperature/humidity sensor (71) is arranged on the right side of the first duct connection portion (C1). By arranging the first temperature/humidity sensor (71) near the outside air intake (o1), the state of dew condensation around the outside air intake (o1) can be grasped.

The first temperature/humidity sensor (71) is placed near the user side electrical component box (70). Specifically, the first temperature/humidity sensor (71) is arranged on the front side of the user-side electrical component box (70). Nothing is arranged between the first temperature/humidity sensor (71) and the user-side electrical component box (70). Arranging the first temperature/humidity sensor (71) near the user-side electrical component box (70) facilitates wiring between the first temperature/humidity sensor (71) and the user-side electrical component box (70). .

The second temperature and humidity sensor (72) measures the temperature and humidity of the air after passing through the total heat exchanger (21) in the air supply path (13). The second temperature/humidity sensor (72) is arranged in the second air supply channel (S2). Specifically, the second temperature/humidity sensor (72) is arranged in the air supply path (13) between the total heat exchanger (21) and the utilization heat exchanger (52).

As shown in FIG. 7, the second temperature/humidity sensor (72) is arranged between the total heat exchanger (21) and the fan unit (F). Here, an upward recessed portion is formed in the lower surface of the exhaust side housing (41). The internal space of the recess communicates only with the introduction space (G). The second temperature/humidity sensor (72) is arranged in the recess of the exhaust side housing (41). Thereby, the second temperature/humidity sensor (72) detects the air after passing through the air supply side internal flow path (21a) of the total heat exchanger (21) and before flowing into the air supply fan (30). can be measured.

The third temperature and humidity sensor (73) measures the temperature and humidity of the air before passing through the total heat exchanger (21) in the air supply path (13). The third temperature/humidity sensor (73) is arranged in the first air supply channel (S1). As shown in FIG. 7, the third temperature/humidity sensor (73) is arranged above the filter (23). The third temperature/humidity sensor (73) is fixed through the upper surface of the first accommodation portion (22).

(5) Operating Behavior The operating behavior of the ventilator (10) will be described with reference to FIG. The ventilator (10) switches between cooling operation and heating operation. The ventilator (10) performs reheat dehumidification operation. In FIG. 2 , solid line arrows indicate the flow of the refrigerant during the cooling operation, and dashed line arrows indicate the flow of the refrigerant during the heating operation.

(5-1) Cooling operation In the cooling operation, the compressor (82) and the heat source fan (81) are operated, the switching mechanism (84) is in the first state, and the heat source heat exchanger (83) is switched to the radiator (strictly speaking, functions as a condenser) and the utilization heat exchanger (52) functions as an evaporator. Specifically, by reducing the degree of opening of the expansion valve (85) and fully opening the pressure reducing valve (52c), the first heat exchange section (52a) and the second heat exchange section (52b) function as evaporators. Function. Additionally, in cooling operation, the air supply fan (30) and the exhaust fan (40) operate.

In the ventilation unit (11), the indoor air (RA) is taken into the first exhaust flow path (E1) as the exhaust fan (40) operates. Outdoor air (OA) is taken into the first air supply channel (S1) as the air supply fan (30) operates. The air in the first air supply channel (S1) flows through the air supply side internal channel (21a) of the total heat exchanger (21). The air in the first exhaust channel (E1) flows through the exhaust-side internal channel (21b) of the total heat exchanger (21).

For example, in summer, the indoor space (5) is cooled by another air conditioner (A) shown in FIG. In this case, the temperature of the indoor air (RA) will be lower than the temperature of the outdoor air (OA). In addition, indoor air (RA) humidity will be lower than outdoor air (OA) humidity. Therefore, in the total heat exchanger (21), the air in the supply side internal flow path (21a) is cooled by the air in the exhaust side internal flow path (21b). At the same time, in the total heat exchanger (21), moisture in the air in the supply side internal flow path (21a) moves to the air in the exhaust side internal flow path (21b).

The air flowing out from the exhaust-side internal flow path (21b) to the second exhaust flow path (E2) flows through the exhaust duct (D2) and is discharged to the outdoor space (6) as exhaust air (EA).

The air cooled and dehumidified in the air supply side internal flow path (21a) flows out to the second air supply flow path (S2). This air is cooled by the first heat exchange section (52a) and the second heat exchange section (52b) of the utilization heat exchanger (52). The cooled air flows through the supply air duct (D3) and is supplied to the interior space (5) as supply air (SA).

(5-2) Heating operation In the heating operation, the compressor (82) and the heat source fan (81) are operated, the switching mechanism (84) is in the second state, and the heat source heat exchanger (83) functions as an evaporator. , the utilization heat exchanger (52) functions as a radiator (strictly speaking, a condenser). Specifically, by reducing the degree of opening of the expansion valve (85) and fully opening the pressure reducing valve (52c), the first heat exchange section (52a) and the second heat exchange section (52b) function as condensers. Function. In addition, in heating operation, the air supply fan (30) and the exhaust fan (40) operate.

The refrigerant circuit (R) during heating operation performs the second refrigeration cycle. In the second refrigerating cycle, the utilization heat exchanger (52) functions as a radiator, and the heat source heat exchanger (83) functions as an evaporator.

For example, in winter, the indoor space (5) is heated by another air conditioner (A) shown in FIG. In this case, the temperature of the indoor air (RA) will be higher than the temperature of the outdoor air (OA). In addition, indoor air (RA) humidity will be higher than outdoor air (OA) humidity. Therefore, in the total heat exchanger (21), the air in the supply side internal flow path (21a) is heated by the air in the exhaust side internal flow path (21b). At the same time, in the total heat exchanger (21), moisture in the air in the exhaust side internal flow path (21b) moves to the air in the air supply side internal flow path (21a).

The air heated and humidified in the air supply side internal channel (21a) flows out to the second air supply channel (S2). This air is heated by the first heat exchange section (52a) and the second heat exchange section (52b) of the utilization heat exchanger (52). The heated air flows through the supply air duct (D3) and is supplied to the interior space (5) as supply air (SA).

(5-3) Reheat dehumidification operation In the reheat dehumidification operation, the compressor (82) and the heat source fan (81) are operated, the switching mechanism (84) is in the first state, and the heat source heat exchanger (83) releases heat. It functions as a condenser (strictly speaking, a condenser) and part of the heat utilization heat exchanger (52) functions as an evaporator. Specifically, by fully opening the expansion valve (85) and reducing the degree of opening of the pressure reducing valve (52c), the first heat exchange section (52a) functions as an evaporator, and the second heat exchange section (52b) functions as an evaporator. ) functions as a radiator (strictly speaking, a condenser). Additionally, in cooling operation, the air supply fan (30) and the exhaust fan (40) operate.

For example, in summer, as in the cooling operation, in the total heat exchanger (21), the air in the supply side internal flow path (21a) is cooled by the air in the exhaust side internal flow path (21b). At the same time, in the total heat exchanger (21), moisture in the air in the supply side internal flow path (21a) moves to the air in the exhaust side internal flow path (21b). The air cooled and dehumidified in the air supply side internal channel (21a) flows out to the second air supply channel (S2). This air is cooled to below the dew point temperature in the first heat exchange section (52a) of the heat utilization heat exchanger (52). As a result, moisture in the air is condensed and the air is dehumidified.

The temperature of the dehumidified air passing through the first heat exchange section (52a) becomes excessively low. Therefore, if the air cooled in the first heat exchange section (52a) is supplied to the indoor space (5) as it is, the comfort of the indoor space (5) may be impaired. Therefore, the air cooled in the first heat exchange section (52a) is heated in the second heat exchange section (52b). As a result, the relative humidity of the air cooled and dehumidified in the total heat exchanger (21) is lowered, and the temperature of the air can be adjusted to a comfortable temperature. The air heated in the second heat exchange section (52b) flows through the air supply duct (D3) and is supplied to the indoor space (5) as supply air (SA).

(6) Arrangement relation of total heat exchanger, supply air fan, exhaust fan, indoor heat exchanger, etc. As shown in FIG. , and the utilization heat exchanger (52) are arranged side by side in the second direction (front-rear direction) along the lower surface (lower plate (12b)) of the casing (12). The air supply fan (30) and the exhaust fan (40) are arranged to overlap each other in a first direction (substantially vertical direction) orthogonal to the lower plate (12b). This arrangement allows the casing (12) to can be made smaller in the longitudinal direction.

The air supply fan (30) and the exhaust fan (40) are centrifugal fans with their rotation axes along the first direction perpendicular to the lower plate (12b) of the casing (12). Here, the rotating shaft means the rotating shaft of the first impeller (42) and the second impeller (32). The air supply fan (30) is a horizontal fan, and its vertical height is shorter than its front-rear and left-right lengths. The exhaust fan (40) is a horizontal fan, and its vertical height is shorter than its front-rear and left-right lengths. Therefore, even if the air supply fan (30) and the exhaust fan (40) are arranged one above the other, it is possible to prevent the height of the casing (12) from increasing.

As shown in FIG. 8, when all of the total heat exchanger (21), the air supply fan (30), and the utilization heat exchanger (52) are partially viewed in the second direction, that is, the front-rear direction, ,overlapping. As a result, the casing (12) can be made smaller in the left-right direction and the up-down direction.

In the present embodiment, the first duct connection portion (C1) on the air supply side, the total heat exchanger (21), the air supply fan (30), the utilization heat exchanger (52), and the lower The 3-duct connection portion (C3) overlaps in the front-rear direction. Strictly speaking, the first duct connection portion (C1), the first air supply channel (S1), the air supply side internal channel (21a) of the total heat exchanger (21), the second air supply channel (S2 ), the utilization heat exchanger (52), and the lower third duct connection portion (C3) overlap in the front-rear direction. Therefore, the air supply passage (13) has a large number of flow passages extending linearly, so that the passage resistance of the air supply passage (13) can be reduced. Here, the part of the second air supply flow path (S2) refers to a flow path (for example, the introduction space (G)) between the total heat exchanger (21) and the heat utilization heat exchanger (52), 3 shows a flow path (a part of the internal space of the second accommodation portion (51)) between the container (52) and the third duct connection portion (C3).

One or more air supply ducts (D3) are connected to the downstream side of the air supply path (13). The number of air supply ducts (D3) tends to increase and the length of the passage tends to be longer than that of the exhaust ducts (D2). Therefore, the static pressure in the flow path on the blowout side of the air supply fan (30) tends to be higher than the static pressure in the flow path on the blowout side of the exhaust fan (40). By reducing the flow path resistance of the air supply path (13), the load on the air supply fan (30) can be reduced. As a result, it is possible to prevent the rated capacity of the air supply fan (30) from becoming larger than the rated capacity of the exhaust fan (40). In this embodiment, the air supply fan (30) and the exhaust fan (40) have the same rated capacity.

In this embodiment, the total heat exchanger (21) and the exhaust fan (40) overlap each other when viewed from the front-rear direction. As a result, the casing (12) can be made smaller in the left-right direction and the up-down direction. Strictly speaking, all parts of the total heat exchanger (21), the exhaust fan (40), and the heat utilization heat exchanger (52) overlap each other when viewed from the front-rear direction. As a result, the casing (12) can be made even smaller in the left-right direction and the up-down direction.

As shown in FIG. 8, in this embodiment, both the first impeller (42) and the second impeller (32) are positioned within the range from the lower end to the upper end of the total heat exchanger (21), And it is positioned within the range from the lower end to the upper end of the heat exchanger (52). Therefore, even if the air supply fan (30) and the exhaust fan (40) are arranged one above the other, it is possible to prevent the casing (12) from increasing in size in the vertical direction.

(7) Relationship between height positions of total heat exchanger, indoor heat exchanger, supply fan, and exhaust fan As shown in Fig. 8, the height position h1 of the upper end of the utilization heat exchanger It is positioned higher than the height position h2 of the upper end of the heat exchanger (21). As a result, the height of the ventilation surface of the heat utilization heat exchanger (52) can be increased, so that the heat transfer area between the heat utilization heat exchanger (52) and the air can be increased. Thereby, the capacity of the utilization heat exchanger (52) can be increased.

In addition, by making the height position h2 lower than the height position h1, the total heat exchange upper space (24), which is part of the exhaust passage (14), can be secured above the total heat exchanger (21). . The total heat exchange upper space (24) corresponds to the first flow path of the present disclosure. This can suppress an increase in flow path resistance of the exhaust path (14).

The height position h3 of the upper end of the air supply fan (30) is higher than the half height position h4 in the first direction (vertical direction) in the casing (12). The height position h3 of the upper end of the air supply fan (30) corresponds to the height position of the lower end of the exhaust fan (40). In other words, the fan unit (F) is arranged closer to the upper plate (12a) between the upper plate (12a) and the lower plate (12b) of the casing (12). This ensures a sufficient height for the air supply side suction space (35). Specifically, the height of the air supply side suction space (35) is greater than the height of the exhaust side suction space (44). As a result, the flow path resistance on the suction side of the air supply fan (30) can be effectively reduced. The air supply side suction space (35) corresponds to the second flow path of the present disclosure.

As described above, the static pressure of the air supply fan (30) on the blowout side tends to be higher than that of the exhaust fan (40). By reducing the flow path resistance of the air supply fan (30) in this way, the load on the air supply fan (30) can be reduced. As a result, it is possible to prevent the rated capacity of the air supply fan (30) from becoming excessively large compared to the rated capacity of the exhaust fan (40).

In addition, the air supply side suction space (35) is formed adjacent to the drain pan (64) in the front-rear direction. Thereby, the dead space formed by providing the drain pan (64) can be used as the intake side suction space (35). Strictly speaking, the air supply side suction space (35) is adjacent to the drain pan (64) and the total heat exchanger (21) in the longitudinal direction.

The air supply side suction space (35) is formed within the range from the lower end to the upper end of the drain pan (64). Therefore, it is possible to prevent the casing (12) from becoming larger in the vertical direction due to the formation of the air supply side suction space (35) below the air supply fan (30).

(8) Shape and Position of Air Supply Side Outlet As shown in FIG. 8, the air supply side outlet (37) of the air supply fan (30) faces the heat utilization heat exchanger (52). Strictly speaking, the air supply side outlet (37) faces the ventilation surface of the heat utilization heat exchanger (52). In other words, the air supply side outlet (37) and the ventilation surface of the heat utilization heat exchanger (52) overlap in the front-rear direction. Here, the "ventilation surface" is a surface formed on the upstream side (front side) of the heat utilization heat exchanger (52) through which air can flow. Therefore, the air blown out from the air supply side outlet (37) can be reliably introduced into the ventilation surface of the heat utilization heat exchanger (52).

As shown in FIG. 10, the air supply side outlet (37) extends in the lateral direction, which is the longitudinal direction of the heat utilization heat exchanger (52). Specifically, the air-supply side outlet (37) is formed in a rectangular shape with long sides extending in the horizontal direction and short sides extending in the vertical direction. Therefore, the air blown out from the air supply side outlet (37) spreads in the left-right direction. This can prevent air from being locally supplied to the ventilation surface in the longitudinal direction of the heat utilization heat exchanger (52). As a result, the heat transfer performance of the utilization heat exchanger (52) can be improved. The longitudinal direction of the utilization heat exchanger (52) corresponds to the direction in which the straight tubes of the heat transfer tubes extend and the direction in which the fins are arranged.

(9) Active Species Supply Section As shown in FIG. 8, the ventilation unit (11) includes an active species supply section (74). The active species supply section (74) is a generator that generates active species into the air. The active species supply section (74) generates active species (eg, radicals, ozone, high-speed electrons, excited molecules, etc.) by streamer discharge. The active species react with the components to be treated (hazardous components, odorous components, etc.) in the air, thereby oxidizing and decomposing the components to be removed.

The active species supply section (74) is arranged in the air supply path (13). Specifically, the active species supply section (74) is arranged in the introduction space (G) in the second air supply channel (S2). The active species supply section (74) is arranged along the left side plate (12f) of the casing (12).

The air containing the active species generated by the active species supply section (74) flows through the utilization heat exchanger (52). As a result, the surface of the heat exchanger for utilization (52) can be sterilized, and the propagation of bacteria and mold on the surface of the heat exchanger for utilization (52) can be suppressed.

Air containing active species flows above the drain pan (64). Therefore, the drain pan (64) can be sterilized, and propagation of bacteria and mold in the drain pan (64) can be suppressed.

Air containing active species is supplied to the indoor space (5). As a result, the air in the indoor space (5) can be purified and sterilized.

(10) Features (10-1)
The air supply fan (30) and the exhaust fan (40) are centrifugal fans each of which rotates in a first direction perpendicular to the lower plate (12b) of the casing (12). The total heat exchanger (21), the supply air fan (30) and the utilization heat exchanger (52) are arranged in a second direction along the lower plate (12b) of the casing (12) and the exhaust fan (40 ) are arranged so as to overlap the air supply fan (30) when viewed from one direction.

With this configuration, it is possible to prevent the casing (12) from becoming large in the front-rear direction and the vertical direction, and it is possible to reduce the size of the ventilator (10).

(10-2)
The total heat exchanger (21), the air supply fan (30), and the second heat exchanger (52) all overlap each other when viewed from the second direction.

With this configuration, it is possible to suppress the casing (12) from becoming large in the horizontal direction and the vertical direction. In addition, as shown in FIG. 8, the flow paths of the air supply path (13) are likely to be aligned on the same straight line, so the flow path resistance of the air supply path (13) can be reduced. As a result, the load on the air supply fan (30) can be reduced.

(10-3)
The total heat exchanger (21) and the exhaust fan (40) overlap each other when viewed from the second direction.

With this configuration, it is possible to suppress the casing (12) from becoming large in the horizontal direction and the vertical direction.

(10-4)
The upper end of the heat utilization heat exchanger (52) is positioned higher than the upper end of the total heat exchanger (21), and the exhaust path (14) is formed above the total heat exchanger (21). It contains a headspace (24).

With this configuration, the heat transfer area of the utilization heat exchanger (52) can be expanded, and the capacity of the utilization heat exchanger (52) can be increased. A part of the flow path of the exhaust path (14) can be secured above the total heat exchanger (21), and the flow path resistance of the exhaust path (14) can be reduced.

(10-5)
The air supply fan (30) is arranged below the exhaust fan (40). The air supply path (13) is formed below the air supply fan (30) and adjacent to the drain pan (64) in the second direction, and communicates with the suction port (36) of the air supply fan (30). Includes intake air space (35).

With this configuration, the dead space formed by providing the drain pan (64) can be used as the air supply side suction space (35). Since the flow path resistance on the suction side of the air supply fan (30) can be reduced, the load on the air supply fan (30) can be reduced. It is possible to prevent the rated capacity of the air supply fan (30) from becoming excessively larger than the rated capacity of the exhaust fan (40).

(10-6)
The air supply fan (30) is arranged below the exhaust fan (40). The upper end of the air supply fan (30) is higher than half the height of the casing (12) in the first direction. The air supply path (13) includes an air supply side suction space (35) formed below the air supply fan (30) and communicating with the suction port (36) of the air supply fan (30).

With this configuration, the flow path resistance on the suction side of the air supply fan (30) can be reduced, so the load on the air supply fan (30) can be reduced. It is possible to prevent the rated capacity of the air supply fan (30) from becoming excessively larger than the rated capacity of the exhaust fan (40).

(10-7)
The ventilator (10) includes a supply section (74) arranged in the air supply path (13) and supplying active species into the air. Therefore, the air in the indoor space (5) can be purified and sterilized. In the utilization heat exchanger (52) and drain pan (64), propagation of bacteria and mold can be suppressed.

(10-8)
The air supply side outlet (37) of the air supply fan (30) faces the heat utilization exchanger (52) and extends in the longitudinal direction of the heat utilization heat exchanger (52).

With this configuration, the air blown out from the air supply side outlet (37) can easily spread in the longitudinal direction of the heat utilization heat exchanger (52). As a result, it is possible to prevent air from flowing locally in the heat utilization heat exchanger (52).

(11) Other Embodiments The first heat exchanger (21) is a sensible heat exchanger that exchanges only the sensible heat of the air flowing through the air supply passage (13) and the air flowing through the exhaust passage (14). good too.

The active species supply section (74) may be arranged in a channel (first air supply channel (S1)) upstream of the total heat exchanger (21) in the air supply channel (13). In this case, the active species can sterilize the total heat exchanger (21). The active species supply section (74) may be arranged in the exhaust path (14). In this case, it is preferable to arrange the active species supply section (74) in the flow path (first exhaust flow path (E1)) on the upstream side of the total heat exchanger (21) in the exhaust path (14).

The air supply fan (30) may be arranged above the exhaust fan (40). In this case, for example, the ventilator (10) of the above-described embodiment is turned upside down. In this configuration, the first exhaust flow path (E1) is formed in the upper surface of the casing (12). The indoor space (5) and the first exhaust flow path (E1) communicate through a duct. Thereby, the air in the indoor space (5) can be introduced into the exhaust path (14).

Although the embodiments and modifications have been described above, it will be understood that various changes in form and details are possible without departing from the spirit and scope of the claims. In addition, the elements according to the above embodiments, modifications, and other embodiments may be appropriately combined or replaced.

The descriptions of "first", "second", "third", etc. described above are used to distinguish the words and phrases to which these descriptions are given, and the number and order of the words and phrases are also limited. not something to do.

As described above, the present disclosure is useful for ventilators.

REFERENCE SIGNS LIST 10 ventilator 12 casing 12b lower surface 13 air supply path 14 exhaust path 21 total heat exchanger (first heat exchanger)
24 Total heat exchange upper space (first flow path)
30 Air supply fan 35 Air supply side suction space (second flow path)
36 second suction port (suction port)
37 Air supply side outlet (outlet)
40 exhaust fan 52 utilization heat exchanger (second heat exchanger)
64 drain pan 74 active species supply unit (generating unit)

Claims

a casing (12) having an air supply path (13) for supplying outdoor air to the room and an exhaust path (14) for discharging the indoor air to the outside;
an air supply fan (30) for conveying air in the air supply path (13);
an exhaust fan (40) for conveying the air in the exhaust passage (14);
a first heat exchanger (21) for exchanging heat between air flowing through the air supply passage (13) and air flowing through the exhaust passage (14);
a second heat exchanger (52) disposed downstream of the first heat exchanger (21) in the air supply path (13);
The air supply fan (30) and the exhaust fan (40) are centrifugal fans each having a rotation axis along a first direction perpendicular to the lower surface (12b) of the casing (12),
The first heat exchanger (21), the air supply fan (30), and the second heat exchanger (52) are arranged in a second direction along the lower surface (12b) of the casing (12). ,
A ventilator in which the exhaust fan (40) is arranged to overlap with the air supply fan (30) when viewed from the first direction.
2. Ventilation according to claim 1, wherein the first heat exchanger (21), the air supply fan (30) and the second heat exchanger (52) all overlap each other when viewed from the second direction. Device.
The ventilation system according to claim 1 or 2, wherein the first heat exchanger (21) and the exhaust fan (40) overlap each other when viewed from the second direction.
the upper end of the second heat exchanger (52) is higher than the upper end of the first heat exchanger (21);
The ventilator according to any one of claims 1 to 3, wherein the exhaust path (14) includes a first flow path (24) formed above the first heat exchanger (21).
A drain pan (64) arranged below the second heat exchanger (52),
The air supply fan (30) is arranged below the exhaust fan (40),
The air supply path (13) is formed at a position below the air supply fan (30) and adjacent to the drain pan (64) in the second direction, and is connected to the suction port (36) of the air supply fan (30). ), comprising a second channel (35) in communication with ).
The air supply fan (30) is arranged below the exhaust fan (40),
an upper end of the air supply fan (30) is positioned higher than a half height position of the casing (12) in the first direction;
The air supply path (13) includes a second flow path (35) formed below the air supply fan (30) and communicating with the suction port (36) of the air supply fan (30),
Ventilation device according to any one of claims 1-5.
The ventilator according to any one of claims 1 to 6, further comprising a generator (74) arranged in the air supply path (13) and generating active species in the air.
The outlet (37) of the air supply fan (30) faces the second heat exchanger (52) and extends in the longitudinal direction of the second heat exchanger (52). A ventilator according to any one of the preceding claims.