JP3126886B2 - Air conditioner - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an air conditioner, and more particularly to, for example, a VAV for simultaneously air-conditioning a plurality of rooms in a house.
The present invention relates to an air conditioner applied to a (variable air volume) system.

[0002]

2. Description of the Related Art An example of this type of conventional air conditioner is disclosed in Japanese Patent Application Laid-Open No. Hei 4-236028. In this prior art, a return air port for taking in return air and an exhaust intake port for taking in exhaust gas are provided independently of each other, and a return air port and an air supply port for sending air supply are mutually connected to the casing. It was provided on the orthogonal side. The air supply fan is provided downstream of the total heat exchanger in the air supply passage, and the exhaust fan is provided upstream of the total heat exchanger in the exhaust passage.

[0003]

In the prior art, the return air and the exhaust air from the room to be air-conditioned are introduced into the air conditioner through two independent ducts, respectively, so that the whole system becomes large. There was a point. Further, in the total heat exchanger, since the exhaust side has a positive pressure with respect to the outside air side, which has a negative pressure, there is also a problem that the exhaust side exhaust gas flows into the outside air side, and the air conditioning performance is reduced.

[0004] Therefore, a main object of the present invention is to provide an air conditioner capable of reducing the size of the entire system and preventing a decrease in air conditioning performance.

[0005]

SUMMARY OF THE INVENTION The present invention provides a casing having a return air port, an air supply port, an outside air port and an exhaust port, a first ventilation path connecting the return air port and the air supply port, and a first air passage. An air supply fan provided in the air passage, a heat exchanger provided downstream of the air supply fan in the first air passage, and a second air passage communicating the outside air port with the first air passage upstream of the air supply fan. Ventilation path,
A total heat exchange disposed between the third ventilation path, the second ventilation path, and the third ventilation path that communicates the return air port and the exhaust port, and performing total heat exchange between the outside air and the return air; An air conditioner comprising: a fan, an exhaust fan provided downstream of a total heat exchanger in a third ventilation path, and a motor that simultaneously drives an air supply fan and an exhaust fan.

[0006]

When the air supply fan and the exhaust fan are driven by the motor, the return air from the room to be air-conditioned is taken into the casing through the return air port, a part of the air is sucked into the air supply fan, and the rest is the total heat exchanger. Through the exhaust fan. The return air sucked by the exhaust fan is discharged outside through the exhaust port. In addition, outside air from the outside is taken into the casing through the outside air port, and is sucked into the air supply fan through the total heat exchanger. Then, return air and outside air are mixed in the air supply fan, and the air-fuel mixture is heated or cooled through the heat exchanger, and then supplied to the room to be air-conditioned through the air supply port.

[0007]

According to the present invention, there is no need to distinguish between return air and exhaust air when the air is taken into the air conditioner, so there is no need to provide a separate duct for taking the exhaust gas. Therefore, the whole system can be downsized. Further, in the total heat exchanger, since both the outside air side and the exhaust side have a negative pressure, it is possible to prevent the exhaust gas to be discharged outside from flowing into the outside air side, and to prevent a decrease in air conditioning performance.

Further, when the return air inlet and the air inlet are formed on the mutually facing side surfaces of the casing, the air return duct and the air supply duct can be arranged in a straight line, so that they can be easily installed in a narrow space such as a space above the ceiling. Can be installed. The above and other objects, features and advantages of the present invention will become more apparent from the following detailed description of embodiments with reference to the drawings.

[0009]

1 to 5 show an air conditioner 1 according to this embodiment.
0 is a plurality (five in this embodiment) of rooms 12a in the house
12e is applied to an air-conditioning system for air-conditioning simultaneously, and includes a casing 14. Casing 14
The first chamber 20, the second chamber 22, the third chamber 22, the third chamber 16 and the total heat exchanger 18 arranged such that the longitudinal direction thereof coincides with the longitudinal direction of the casing 14.
A chamber 24, a fourth chamber 26, a fifth chamber 28, a sixth chamber 30, and a seventh chamber 32 are formed.

The partition 16 has a first chamber 20 and a second chamber 22.
34, the opening 36 connecting the second chamber 22 and the third chamber 24, the opening 38 connecting the fourth chamber 26 and the fifth chamber 28, and the second chamber 22 and the seventh chamber 32. An opening 40 for communication is formed, and an air filter 42, an air supply fan 44, an exhaust fan 46, and a damper 48 are attached to each of the openings 34, 36, 38 and 40. Also,
A motor 50 that drives the air supply fan 44 and the exhaust fan 46 at the same time and whose rotation speed is controlled by an inverter 49 (FIG. 1) is mounted on the partition wall 16 separating the second chamber 22 and the fourth chamber 26. A return air port 52 is formed on the left side of the first chamber 20, an air supply port 54 is formed on the right side of the third chamber 24, and an exhaust port 56 is formed on the left side of the fifth chamber 28. An outside air port 58 is formed on the left side surface of the sixth chamber 30. Therefore, inside the casing 14, as shown by the arrow in the figure, the first ventilation path A that connects the return air port 52 and the air supply port 54 and extends linearly, the outside air port 58, and the first air port 58 are connected.
A second ventilation path B that communicates the ventilation path A with the upstream side of the air supply fan 44 and a substantially U-shaped third ventilation path C that communicates the return air port 52 and the exhaust port 56 are formed.

As can be clearly understood from FIG.
Inside the chamber 22, a humidity sensor 60 and a temperature sensor 62 are provided.
(FIG. 1) is provided, and a cooling coil 64, a heating coil 66, a humidifier 68, and a temperature sensor 70 (FIG. 1) are provided inside the third chamber 24 from the upstream side. Relatedly, motorized valves 72 and 74
Is mounted, and an electromagnetic valve 76 is associated with the humidifier 68.
Is attached. Further, inside the sixth chamber 30, a wind speed sensor 78 is provided near the outside air port 58, and an air filter 80 is provided near the inlet of the total heat exchanger 18.

The temperature sensors 62 and 70, the humidity sensor 60, and the wind speed sensor 78
An I (analog input) terminal 84 is connected, the electric valves 72 and 74, the inverter 49 and the damper 48 are connected to an AO (analog output) terminal 86, and the inverter 49 is further connected to a DI (digital input) terminal 88. , An electromagnetic valve 76 is connected to a DO (digital output) terminal 90.

On the other hand, each room 12a to 12e in the house has
An air supply port 92 and a return air port 94 are formed, and the air supply port 92 and the air supply port 54 of the air conditioner 10 are communicated via an air supply duct 96, and the return air port 94 and the air return of the air conditioner 10 are returned. Mouth 52
Are communicated via a return air duct (not shown). Also,
In the air supply duct 96, in relation to each of the chambers 12a to 12e,
A VAV (variable air volume) unit 104 including a damper 98, a wind speed sensor 100, and a control unit 102 is provided.
The control unit 102 of the AV unit 104 includes the
The room thermo 106 provided in 12e is connected.
Each VAV unit 104 is connected to an SI (serial interface) terminal 110 of the controller 82 via an operation panel 108.

In operation, when the heating operation is selected by the operation panel 108, the electric valve 72 of the cooling coil 64 is closed and the electric valve 74 of the heating coil 66 is closed.
Is opened, and the electromagnetic valve 76 of the humidifier 68 is opened as needed. Then, the air supply fan 44 and the exhaust fan 46 are simultaneously driven at a predetermined rotation speed by the motor 50.

When the air supply fan 44 and the exhaust fan 46 are driven, the return air discharged from each of the return air ports 94 of the chambers 12a to 12e is supplied to the air conditioner 10 through a return air duct and a return air port 52 (not shown). It is taken into the first chamber 20.
The return air taken into the first chamber 20 is supplied to the air filter 42.
Flows into the second chamber 22 through the
To the fourth chamber 26 through the total heat exchanger 18.
It is sucked by the exhaust fan 46 inside. The return air sucked by the exhaust fan 46 is exhausted outside through the fifth chamber 28, the exhaust port 56, and an exhaust duct (not shown). Further, outside air from the outside is taken into the sixth chamber 30 through the outside air port 58, and after dust is removed through the air filter 80, the air is sucked into the air supply fan 44 in the second chamber 22 through the total heat exchanger 18 and the damper 48. Is done. Then, outside air and return air are mixed in the air supply fan 44. At this time, the opening of the damper 48 is controlled such that the outside air amount detected by the wind speed sensor 78 becomes the required outside air amount.

The mixture of the outside air and the return air mixed in the air supply fan 44 is blown into the third chamber 24, heated to a predetermined temperature through a heating coil 66, and humidified as needed through a humidifier 68. After that, the air is supplied from the air supply port 54 to the rooms 12a to 12e to be air-conditioned through the air supply duct 96. In each VAV unit 104, the opening of damper 98 is controlled such that the room temperature detected by room thermo 106 has a predetermined constant value.

Similarly, when the cooling operation is selected by the operation panel 108, the supply air cooled to a predetermined temperature can be supplied to each room to be air-conditioned. According to this embodiment, since there is no need to separately provide a duct for taking in exhaust gas into the air conditioner 10, the entire system can be downsized. Further, since both the air supply fan 44 and the exhaust fan 46 are provided on the outlet side of the total heat exchanger 18, both the outside air side and the exhaust side of the total heat exchanger 18 have a negative pressure, and the airtightness between them is reduced. Can be secured. Therefore, it is possible to prevent a part of the exhaust gas from flowing into the outside air, and to prevent a decrease in the air conditioning performance.

The air supply fan 44 is controlled by one motor 50.
And the exhaust fan 46 is driven,
The air conditioner 10 can be reduced in size and power consumption can be reduced. Further, since the number of driving parts is small, the reliability of operation can be improved. Since the exhaust fan 46 only needs to have an output capable of exhausting a part of the return air, a relatively low-output fan such as a one-suction centrifugal fan can be used as the exhaust fan 46, thereby also reducing power consumption. Can be reduced.

Further, since the return air port 52 and the air supply port 54 are formed on the mutually facing side surfaces of the casing 14,
The return air duct (not shown) and the air supply duct 96 can be arranged in a straight line, and therefore can be easily installed in a narrow space such as a space above the ceiling.

[Brief description of the drawings]

FIG. 1 is an illustrative view showing an air conditioning system to which an embodiment of the present invention is applied;

FIG. 2 is an illustrative view showing one embodiment of the present invention;

FIG. 3 is a sectional view taken along line III-III in FIG. 2;

FIG. 4 is a sectional view taken along line IV-IV in FIG.

FIG. 5 is a sectional view taken along line VV in FIG. 2;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 ... Air conditioner 14 ... Casing 18 ... Total heat exchanger 42,80 ... Air filter 44 ... Air supply fan 46 ... Exhaust fan 48 ... Damper 50 ... Motor 52 ... Return air port 54 ... Air supply port 56 ... Exhaust port 58 ... Outside air port 64 ... Cooling coil 66 ... Heating coil 68 ... Humidifier 104 ... VAV unit 106 ... Room thermo

──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Isamu Tanabe 5-1-1, Mami Minami, Koryo-cho, Kitakatsuragi-gun, Nara Prefecture Inside Tanabe Giken Co., Ltd. (72) Inventor Shuzo Akita Hirade Kogyo Co., Ltd. Housing complex 28: Kubota Train Co., Ltd. Tochigi Plant (72) Inventor Masaaki Shinohara Uchinomiya City, Tochigi Prefecture 28 Tochigi Plant Co., Ltd. (72) Inventor Ken Nakano 28: Hirade Industrial Park, Utsunomiya City, Tochigi Prefecture Kubota Train 28 Inside the Tochigi Plant (72) Inventor Shogo Tomita 28 Hirade Industrial Park, Utsunomiya City, Tochigi Prefecture Inside Kubota Train Co., Ltd. (72) Toshikazu Okumura 1-1-1, Hama, Amagasaki City, Hyogo Prefecture Kubota Corporation Inside the Technology Development Laboratory (72) Inventor Masafumi Inoue 1-1-1 Hama, Amagasaki City, Hyogo Prefecture Kubota Corporation Operative development in the Laboratory (58) investigated the field (Int.Cl. ^7, DB name) F24F 3/044 F24F 1/00 431 F24F 1/00 441

Claims (2)

(57) [Claims] 1. A casing having a return air port, an air supply port, an outside air port, and an exhaust port, a first ventilation path communicating between the return air port and the air supply port, and provided in the first ventilation path. An air supply fan; a heat exchanger provided downstream of the air supply fan in the first air passage; a second air passage communicating the outside air port and the first air passage upstream of the air supply fan. A ventilation path, a third ventilation path communicating the return air port and the exhaust port, and a third ventilation path arranged between the second ventilation path and the third ventilation path and between the outside air and the return air. An air conditioner comprising: a total heat exchanger that performs total heat exchange; an exhaust fan provided downstream of the total heat exchanger in the third ventilation path; and a motor that simultaneously drives the air supply fan and the exhaust fan. . 2. The air conditioner according to claim 1, wherein said return air port and said air supply port are formed on mutually facing side surfaces of said casing.