JPH07104030B2 - Air conditioner - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to an air conditioner that automatically switches between a cooling operation mode and a heating operation mode, and particularly relates to an operation mode switching control measure. Is.

(Prior Art) Generally, an indoor unit of an air conditioning unit in which a compressor, an outdoor heat exchanger, an expansion mechanism, and an indoor heat exchanger are sequentially connected to an air conditioner installed in a large building, for example, is the same. Some are configured by installing multiple units in the room. And, each of the above-mentioned air conditioning units is disclosed in JP-A-62-196542
As disclosed in the publication, the cooling operation mode and the heating operation mode are automatically switched based on a preset set temperature.

For example, if the set temperature is set to 25 ° C, if the indoor temperature is 25 ° C or higher, the cooling operation mode is set and the indoor temperature is 25 ° C.
When the temperature is lower, the heating operation mode is automatically switched to cool air or warm air into the room to perform air conditioning in the room.

(Problems to be Solved by the Invention) In the above-described air conditioner, conventionally, only the set temperature is commanded to each indoor unit of a plurality of air conditioning units provided in the same room, and each air conditioning unit individually performs cooling operation. Since the mode and the heating operation mode are switched, there is a problem that all the air conditioning units are not operated in the same operation mode at the same time.

That is, as shown in FIG. 3, for example, when four indoor units of air conditioning units (b, b, ...) Are installed in one room (a), the indoor (a) is exposed to a window ( It will be divided into a perimeter zone (d) with c) and an interior zone (e) that does not, and both zones (d, e)
In the room temperature will be different. Especially, in the middle period, the indoor temperature of both zones (d, e) is different near the set temperature, so the above air conditioning units (b, b, ...) are set to different set temperatures in both zones (d, e). However, for example, the air conditioning unit (b) in the perimeter zone (d) is operated in the heating operation mode and the air conditioning unit (b) in the interior zone (e) is operated in the cooling operation mode.

Moreover, the air conditioning unit (b) has a dead zone of ± 0.5 ° C. with respect to the set temperature. For example, as shown in FIG. 7 (a), the set temperature of the air conditioning unit (b) in the perimeter zone (d) is set. Is set to 24.9 ° C, the heating operation mode starts at an indoor temperature of 24.4 ° C and stops at 25.4 ° C, while as shown in Fig. 7 (b), the air conditioning unit (b) in the interior zone (e) ) Set temperature to 25.1
When set to ° C, the cooling operation mode starts at an indoor temperature of 25.6 ° C and stops at 24.6 ° C.

Therefore, the air conditioning unit (b) in the perimeter zone (d) is in the heating operation mode until the temperature difference of 0.8 ° C. or more occurs in both zones (d, e), and the interior zone (e)
Since the air conditioning unit (b) of (1) is simultaneously operated in the cooling operation mode, there is a problem that comfortable air conditioning cannot be performed.

In view of such a point, the present invention has three operation mode switching regions.
By classifying into stages and switching to the heating operation mode of the cooling motion mode based on the outdoor temperature in the intermediate area, a plurality of air conditioning units all operate in the same operation mode to improve comfort. The purpose is to achieve.

(Means for Solving the Problems) In order to achieve the above-mentioned object, the means taken by the present invention is, as shown in FIG. 1 and FIG. A plurality of air conditioning units (2, 2, ...) Which are configured by a circuit and are capable of reversible operation are individually provided for the heating operation motes in the cooling operation mode.

Then, the set temperature for switching the operation mode of each of the air conditioning units (2, 2, ...) Between the cooling operation mode and the heating operation mode, and the same set temperature is set for each air conditioning unit (2, 2, ...). The setting means (6,6, ...) for setting is provided.

Furthermore, temperature detecting means (7) for detecting the outdoor temperature is provided.

In addition, the set region in which the set temperature is set is divided into an intermediate region, a high temperature region higher than the intermediate region, and a low temperature region lower than the intermediate region, and the set temperature is set in the intermediate region. An automatic switching means (51) is provided for automatically switching all of the air conditioning units (2, 2, ...) To the cooling operation mode when the outdoor temperature becomes a predetermined temperature or higher and to the heating operation mode when the outdoor temperature becomes lower than the predetermined temperature.

Moreover, when the set temperature is set in the high temperature range, a cooling switching means (52) for switching all the air conditioning units (2, 2, ...) To the cooling operation mode, and when the set temperature is set in the low temperature range Heating switching means (53) for switching all the air conditioning units (2, 2, ...) To the heating operation mode is provided.

(Operation) With the above configuration, in the present invention, each air conditioning unit (2, 2,
...) circulates the refrigerant between the compressor (31), the outdoor heat exchanger (32), the expansion mechanism (33, 42), and the indoor heat exchanger (41), and individually cools them. And the heating operation mode are weakly operated to blow cold and warm air into the room to air-condition the room.

The air conditioning unit (2,2, ...) is set by the setting means (6,6,
...), the same set temperature is set, while the temperature detecting means (7) detects the outdoor temperature. Then, when the set temperature is set to the intermediate region, the automatic switching means (51) compares the preset predetermined temperature with the outdoor temperature, and when the outdoor temperature is, for example, 20 ° C. or higher, the cooling operation mode is set to 20 If the temperature is lower than ℃, switch all air conditioning units (2, 2, ...) to the heating operation mode.

On the other hand, when the set temperature is set to the high temperature range, the cooling switching means (52) is set to the cooling operation mode, and when it is set to the low temperature range, the heating switching means (53) is set to the heating operation mode. 2,2) will be switched.

Therefore, all the air conditioning units (2,2, ...) in the same room are always operated in the same mode, and especially in the middle period even if the room temperature in the indoor perimeter zone is different from that in the interior zone. Since the air conditioner is operated, it is possible to prevent a malfunction such as one air conditioning unit (2) performing a cooling operation during the heating operation, and it is possible to perform comfortable air conditioning.

(Example) Hereinafter, the Example of this invention is described in detail based on drawing.

As shown in FIG. 2, (1) is an air conditioner installed in a large-scale building or the like, in which a plurality of air conditioning units (2, 2, ...) Perform air conditioning in the same room. There is.

The air conditioning unit (2) is of a heat pump type, and the indoor unit (4) is connected to the outdoor unit (3) by a refrigerant pipe (21) to form an individual refrigerant circuit. And the heating operation mode are reversible. The outdoor unit (3) includes a compressor (31), an outdoor heat exchanger (32), a heating operation expansion mechanism (33), and the like. The compressor (31) compresses a refrigerant and discharges it. The outdoor heat exchanger (32) is connected to the discharge port side of the compressor (31) through the four-way switching valve (34).

The outdoor heat exchanger (32) serves as a condenser in the cooling operation mode,
It serves as an evaporator in the heating operation mode, and is radiated to the atmosphere by the fan (35). The one-way valve (36) is connected to the indoor unit (4) through the one-way valve (36). ) Is bypassed and the expansion mechanism (33) is connected. The suction port side of the compressor (31) is connected to the indoor unit (4) via an accumulator (37) and the four-way switching valve (34).

On the other hand, the indoor unit (4) includes an indoor heat exchanger (41).
And an expansion mechanism (42) for cooling operation. The indoor heat exchanger (41) serves as an evaporator in the cooling operation mode and serves as a condenser in the heating operation mode, and cool and warm air is blown by the fan (34).

One end of the indoor heat exchanger (41) has a one-way valve (44).
To the expansion mechanism (33) side of the outdoor unit (3), and the other end of the four-way switching valve (3) of the outdoor unit (3).
4) side and the one-way valve (4
The expansion mechanism (42) is connected by bypassing 4).

The indoor unit (4) of the air conditioning unit (2) has a third
As shown in the figure, for example, four units are provided in one room (11) in the building, and these four guide units (4, 4, ...) Are appropriately arranged. And, in the room (11), windows (12, 12, ...) Are provided on two side walls, the windows (12, 12, ...) Side is the perimeter zone (11a), and the wall side is the interior zone (11b).
In the perimeter zone (11a), three indoor units (4, 4, 4) are arranged, and in the interior zone (11b), one indoor unit (4) is arranged.

Further, a controller (5) is connected to each of the air conditioning units (2,2, ...) And each of the air conditioning units (2,2, ...) Is heated in the cooling operation mode to the controller (5). The set temperature for switching to the operation mode, the output signal of the setting means (6,6, ...) for setting the same set temperature to each air conditioning unit (2,2, ...) Is input, and the temperature detection means The outdoor temperature detected by the temperature sensor (7) is input.

Then, as shown in FIG. 4, the controller (5) indicates a set region where the set temperature is set, for example, a high temperature region (H) of 26 ° C. or higher, an intermediate region (M), and a low temperature region of 23 ° C. or lower ( L), switching all the air conditioning units (2, 2, ...) To the cooling operation mode in the high temperature region (H) and to the heating operation mode in the low temperature region (L), and in the intermediate region (M). As shown in FIG. 5, when the outdoor temperature is in a range (M1) above a predetermined temperature (for example, 20 ° C.), the cooling operation mode is set, and when the temperature is lower than the predetermined temperature (M2), it is set in the heating operation mode. 2, 2, ...) are switched.

Next, the configuration and operation of the air conditioner (1) will be described.

First, the cooling / heating operation of the air conditioning unit (2) will be described. In the cooling operation mode, the refrigerant discharged from the compressor (31) is condensed by the outdoor heat exchanger (32) and then expanded by the expansion mechanism (42). After evaporating in the indoor heat exchanger (41) to generate cold air, it returns to the compressor (31) through the accumulator (37).

Further, in the heating operation mode, the above operation is performed in reverse, and the refrigerant discharged from the compressor (31) is condensed in the indoor heat exchanger (41) to generate warm air, and then the expansion mechanism (3
It expands in 3), evaporates in the outdoor heat exchanger (32), and returns to the compressor (31).

Next, the operation mode switching control of each of the air conditioning units (2, 2, ...) Will be described based on the control flow shown in FIG.

First, in step ST1, the setting means (6, 6, ...) Set the same set temperature (Ts) at which each air conditioning unit (2, 2, ...) Switches between the cooling operation mode and the heating operation mode, and The outdoor temperature (Ta) is input to the controller (5) from the temperature sensor (7).

Next, move to step ST2 and set temperature (Ts) is 26 ℃.
It is determined whether or not the above, and if the temperature is lower than 26 ° C, the determination is NO.
Then, the process proceeds to step ST3, and it is determined whether or not the set temperature is 23 ° C. or lower. If it is higher than 23 ° C., the determination becomes NO and the process proceeds to step ST4. That is, step S
At T3 and ST4, it is determined whether the set temperature (Ts) is set to the high temperature region (H), the intermediate region (M), or the low temperature region (L).

Then, when this intermediate area (M) is set, the step
In ST4, the automatic switching means (51) is configured to determine whether the outdoor temperature (Ta) is 20 ° C. or higher. If the outdoor temperature (Ta) is 20 ° C. or higher, the determination becomes YES, the process proceeds to step ST5, and all air conditioning units ( 2,2, ...) is switched to the cooling operation mode.

If the outdoor temperature (Ta) is lower than 20 ° C in step ST4, the determination becomes NO and the process moves to step ST6.
All air conditioning units (2,2, ...) will be switched to heating operation mode.

On the other hand, in step ST2 above, the set temperature (Ts) is 2
If it is set to 6 ° C. or higher, it is in the high temperature region (L), so the determination is YES, the process proceeds to step ST5, and the step ST2 constitutes the cooling switching means (52) to configure all the air conditioning units (2, 2). , ...) will be switched to the cooling operation mode.

Also, in step ST3 above, the set temperature (TS) is 2
If it is set to 3 ° C. or less, it is in the low temperature region (L), so the determination becomes YES, the process proceeds to step ST6, and the step ST3 constitutes the heating switching means (53) to configure all the air conditioning units (2, 2). , ...) will be switched to the heating operation mode.

Therefore, in the interim period, all air conditioning units (2, 2, ...) Are operated in the same operation mode even if the indoor temperature of the perimeter zone (11a) and the interior zone (11b) are different near the set temperature (Ts). Will be. That is, for example, the air conditioning unit (2,2,2) in the perimeter zone (11a)
Is in the heating operation mode, even if the room temperature in the interior zone (11b) is higher than the set temperature, the air conditioning unit (2) in the interior zone (11b) is operated in the heating operation mode. Therefore, since the entire room (11) is air-conditioned for either cooling or heating, air conditioning with excellent comfort can be performed.

The air conditioning unit of the present invention is not limited to the embodiment.

(Effect of the invention) As described above, according to the air conditioner of the present invention, the operation mode switching region is divided into three regions, and in the intermediate region, the cooling operation mode and the heating operation mode are switched based on the outdoor temperature. As a result, it is possible to reliably prevent a problem such that only one air conditioning unit in the first room is operated in another operation mode, so that it is possible to perform air conditioning with excellent comfort.

[Brief description of drawings]

FIG. 1 is a block diagram showing the configuration of the present invention. 2 to 6 show an embodiment of the present invention, FIG. 2 is a refrigerant circuit diagram of an air conditioner, and FIG. 3 is an arrangement diagram of indoor units. FIG. 4 is a diagram showing an operation mode switching region, and FIG. 5 is a diagram showing an intermediate region. FIG. 6 is a control flow chart of the air conditioner. FIGS. 7A and 7B are operation state diagrams with respect to the room temperature in the heating operation mode and the cooling operation mode. (1) …… Air conditioner, (2) …… Air conditioning unit,
(3) …… Outdoor unit, (4) …… Indoor unit,
(6) ... Setting means, (7) ... Temperature sensor, (31) ...
... compressor, (32) ... outdoor heat exchanger, (33,42) ... expansion mechanism, (51) ... automatic switching means, (52) ... cooling switching means, (53) ... heating switching means .

Claims (1)

[Claims] 1. A plurality of air-conditioning units (2, 2, ...) Which are installed in the same room, each of which is composed of an individual refrigerant circuit, and can be reversibly operated in a cooling operation mode and a heating operation mode individually. , A set temperature at which the operation mode of each air conditioning unit (2, 2, ...) Is switched between a cooling operation mode and a heating operation mode, and the same set temperature is set for each air conditioning unit (2, 2, ...). Setting means (6, 6, ...), Temperature detecting means (7) for detecting the outdoor temperature, a set area in which the set temperature is set, an intermediate area, a high temperature area higher than the intermediate area, and an intermediate area. It is divided into a low temperature region and a low temperature region, and when the set temperature is set in the intermediate region, the outdoor temperature becomes a predetermined temperature or higher, the cooling operation mode is set, and when the set temperature becomes lower than the predetermined temperature, the heating operation mode is set to all the air conditioning units (2, 2,…) Automatic switching means (51) for switching to the cooling operation mode, cooling setting means (52) for switching all the air conditioning units (2, 2, ...) To the cooling operation mode when the set temperature is set to a high temperature range, and the set temperature An air conditioner characterized by comprising heating switching means (53) for switching all the air conditioning units (2, 2, ...) To the heating operation mode when set to a low temperature range.