JPS622218B2 - - Google Patents

Description

[Detailed description of the invention] The present invention relates to improvements in air conditioners.

As a conventional air conditioning system, as shown in Fig. 2, the double duct system mixes hot air and cold air in a mixing box 13 through a hot air duct 5a and a cold air duct 5b, and then mixes hot air and cold air in each room or each zone R. Since the air temperature can be changed according to the cooling/heating return load, it is possible to achieve comfortable air conditioning, and is excellent in that it can ensure the minimum number of ventilations in the room. However, on the other hand, the return air from the return air duct 8 and the outside air from the outside air duct 9 enter the inlet chamber 3.
Since the outside air is mixed with a single blower, if heating and cooling are required at the same time during winter or mid-season, direct cooling with outside air increases the heating load. Further, since the air conditioner has a push-in type blower 4, there is a risk of air leakage or water leakage inside the machine, and therefore there are problems with the mounting position of the humidifier and the treatment of falling water.

The air conditioner of the present invention eliminates the drawbacks without losing the above-mentioned advantages, and even when cooling is performed directly with outside air, the overall heating load is prevented from increasing, and air leakage inside the machine is prevented. To provide an air conditioner designed to eliminate the fear of water leakage and to be operable even if one of the blowers breaks down.

An embodiment of the present invention will be described below based on the drawings.

In Fig. 1, an air conditioner A has a heating and cooling unit 1 divided into two upper and lower air conditioning casings (hereinafter referred to as casings) 1a and 1b, and a bypass function for the upper and lower casings is provided on the upstream side along the air flow of these casings. Further, an inlet chamber 3 is provided on the upstream side of the filter chamber 2, a hot air blower 4a is provided on the downstream outlet side of the upper casing 1a, and a cold air blower is provided on the downstream outlet side of the lower casing 1b. 4b is provided. These, both blowers 4
a and 4b are a hot air duct 5a and a cold air duct 5b, respectively.
It is possible to supply air to A heating coil 7 is provided inside the upper casing 1a. Further, a cooling coil 6b is provided in the lower casing 1b. A filter 21 is provided in the filter chamber 2,
Dust is filtered out. A return air duct 8 is connected to the upper part of the inlet chamber 3 which is divided into upper and lower parts through a damper 10 for adjusting the amount of return air, and an outside air intake duct 9 is connected to the lower part through a damper 11 for adjusting the outside air. ing.

The hot air duct 5a and the cold air duct 5b are connected to the mixing box 13 through branch pipes 51a and 51b corresponding to the number of air-conditioned rooms. The mixing box 13 is connected to the air conditioning room R via an air supply duct 14. Dampers 12 are also provided in the middle of the hot air duct branch pipe 51a and the cold air duct branch pipe 51b, respectively.

An exhaust duct 16 equipped with a damper 15 for adjusting exhaust volume is branched midway upstream of the return air volume adjustment damper 10 in the return air duct 8 .

In addition, since the cold air volume and hot air volume change depending on the indoor load fluctuation, the upper and lower hot air side blowers 4
a. A conventionally known air volume adjustment mechanism (for example, a scroll damper, an inlet vane, a variable speed electric motor, a movable blade blower, etc.) for the cold air side blower 4b.
(not shown) is provided.

The operating state of the air conditioning system with the above structure will first be described in the case where there is no heating load (mid-season, such as spring and autumn).

Normally, about 1/3 of the warm air sent into the air-conditioned room R is exhausted outdoors through the exhaust duct 14, but the remaining 2/3 enters the inlet chamber 3 as a return air flow. . On the other hand, outside air that is colder than the return air flow introduced through the outside air intake duct 9 also enters the inlet chamber 3, but is filtered through the filter 21.
The suspended dust is filtered out and enters the next heating and cooling section. These warm return air and cold outside air form a laminar flow in the horizontal direction and hardly mix inside the flow inlet chamber 3. is mainly attracted by the cold air side blower 4b and pushed out to the hot air duct 5a and the cold air duct 5b. The air passing through the lower casing 1b is cooled by the cooling coil 6b as required. In this case, the heating coil 7 in the upper casing 1a is in a rest state. These two types of air flows having a temperature difference are mixed at an appropriate temperature in a mixing box 13 by adjusting their respective flow rates by a damper 12, and then supplied to the air conditioned room R.

In addition, when heating load and cooling load occur at the same time (mid-season, winter, etc.), upper casing 1
The warm return air flowing into a is reheated and raised in temperature by the heating coil 7, and the cold introduced outside air flows into the lower casing 1.
The air is sent to the respective ducts 5a, 5b at the same temperature through the cooling coil 6b which is inactive in the cooling coil 6b, mixed to an appropriate temperature in the mixing box 13, and blown to each room.

Although the illustration of adjusting the amount of hot air and cold air supplied into the mixing box 13 is omitted,
The degree of opening and closing of the dampers 51a and 51b is adjusted according to a signal from a temperature controller provided in the air conditioned room R.
Then, the temperature is adjusted according to the mixing ratio of hot air and cold air.

In addition, an upper cooling coil 6 is provided in the upper casing 1a.
By providing the cooling coil 6b, it is possible to compensate for the lack of capacity in the lower cooling coil 6b in response to the peak cooling load in the summer. If not, either one of the blowers can be stopped, and even if one blower fails, operation can be continued using the other blower. Air conditioner A in Figure 1 is intended to be used in a large building, and since there is a cooling load throughout the year, the lower stage is used for the cold air side and the upper stage is used for the hot air side. When there are both cooling and heating loads, the lower stage can be used as the cold/warm air side, and the upper stage can be used as the bypass air side. Even in this case, outside air cooling is possible, and it is also possible to reduce the cooling load.

As described above, in the air conditioner of the present invention, the heating and cooling section is divided into upper and lower air conditioning casings, and the filter chamber is provided on the upstream side of these casings along the air flow, and the inlet chamber is further provided on the upstream side of the filter chamber. ,
The upper casing has a downstream outlet side and a warm air blower.
In addition, a cold air blower is installed on the downstream outlet side of the lower casing so as to be able to send air to the hot air duct and cold air duct, respectively, and a cooling coil and a heating coil are installed on the upper casing (sometimes cooling coils are installed in series). A cooling coil is provided in the lower casing, and the inlet chamber has a return air duct at the top and an outside air intake duct at the bottom. Therefore, not only can the air temperature be changed according to the heating and cooling load for each room or each zone, but also the outside air and return air can be sent to separate hot and cold air ducts without mixing, so that the temperature can be adjusted appropriately. The temperature can be adjusted reliably, and power costs are kept to a minimum. Additionally, since it is a suction type air conditioner, there is no need to worry about air or water leaks.

Furthermore, by providing air volume adjustment mechanisms to the upper and lower blowers, it can be used as a variable air volume system, providing comfort with low heating and cooling costs, and also leading to energy savings.

Moreover, in order to supplement the capacity of one air conditioning casing with the capacity of the other, close the return air regulating damper or outside air regulating damper and introduce the outside air flow into the hot air side air conditioning casing by utilizing the bypass function of the filter chamber. Alternatively, it is also possible to direct the return air flow to the cold side air conditioning casing. Therefore, existing hot air and cold air can be used as is, and highly efficient temperature adjustment can be performed with less power.

[Brief explanation of the drawing]

Figure 1 is a system diagram showing one embodiment of the present invention, Figure 2 is a system diagram showing an embodiment of the present invention.
The figure is a system diagram of a conventional example. A... Air conditioner, B... Air conditioning room, 1... Heating, cooling section, 1a... Upper casing, 1b...
Lower casing, 2...Filter room, 3...Inlet chamber, 31...Wire mesh, 4a...Hot air side blower, 4b...Cold air side blower, 5a...Hot air duct, 5b...Cold air duct, 6a... ...Upper cooling coil, 6b...Lower cooling coil, 7...Heating coil, 8...Return air duct, 9...Outside air intake duct,
13...Mixing box, 14...Exhaust duct.

Claims (1)

[Claims] 1 Divided into two upper and lower air conditioning casings, the upper and lower casings each have a filter chamber with a bypass function for the upper and lower casings on the upstream side along the air flow, and an inlet chamber on the upstream side. An air conditioner characterized in that a blower is provided, the upper casing serves as a hot air side, the lower casing serves as a cold air side, and the inlet chamber has a return air duct opened at the upper part and an outside air intake duct opened at the lower part. .