JPH07824Y2 - Air conditioner - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Object of the Invention] (Field of Industrial Application) The present invention relates to an air conditioner having an indoor fan whose speed can be switched.

(Prior Art) Generally, there are air conditioners that can switch the speed of an indoor fan in three or eight steps. The switching method is automatic switching according to the air conditioning load or user operation. There is a manual switching based on.

For automatic switching according to the air conditioning load, as shown in, for example, FIG. 9 (during cooling) and FIG. 10 (during heating), the speed is reduced as the room temperature Ta approaches the set temperature Ts, and the air volume is increased to “strong”. , "Weak +", "weak""weak-","fine+","fine".

(Problems to be solved by the invention) However, in such automatic switching based on the air-conditioning load, the indoor noise increases at the maximum air volume "strong",
There is a problem in that it causes discomfort to residents. On the other hand, when the air volume is "fine" in the lowest velocity range, there is no problem of indoor noise, but there is a conflicting problem that a good indoor temperature distribution cannot be obtained.

This invention was made in view of the above circumstances,
It is an object of the present invention to provide an air conditioner which is capable of solving the problem of indoor noise and which is capable of always obtaining a good indoor temperature distribution and which is excellent in comfort.

[Construction of the Invention] (Means for Solving Problems) A manual switching mode for selecting a specific indoor fan speed from a plurality of speeds including the maximum speed and the minimum speed by operation is provided, and an automatic switching mode is selected. Means is provided in the operating section, and when the automatic switching mode is selected by this operating section, the speed of the indoor fan is less than the maximum speed selected in the manual switching mode and greater than the minimum speed selected in the manual switching mode. The air conditioner is provided with a control unit that automatically changes the range depending on the air conditioning load.

(Function) In the manual switching mode, the indoor fan speed can be arbitrarily selected from multiple speeds including the maximum speed and the minimum speed. In the automatic switching mode, the indoor fan speed is lower than the maximum speed selected in the manual switching mode. Since the speed is automatically varied according to the air conditioning load within a speed range larger than the minimum speed selected in the mode, the indoor noise is low in the automatic switching mode and operation is possible within the speed range where the indoor temperature distribution is good. Done.

(Embodiment) An embodiment of the present invention will be described below with reference to the drawings.

In FIG. 1, reference numeral 1 denotes a compressor, and a four-way valve 2, an outdoor heat exchanger 3, a decompression device such as an expansion valve 4, an indoor heat exchanger 5 and the like are sequentially connected to the compressor 1 to form a heat pump refrigeration cycle. To be done. That is, during the cooling operation, the refrigerant flows in the direction of the solid arrow in the figure, the outdoor heat exchanger 3 acts as a condenser, and the indoor heat exchanger 5 acts as an evaporator. During the heating operation, the switching operation of the four-way valve 2 causes the refrigerant to flow in the direction of the dashed arrow in the figure, so that the indoor heat exchanger 5 acts as a condenser and the outdoor heat exchanger 3 acts as an evaporator. An outdoor fan 6 is arranged near the outdoor heat exchanger 3, and an indoor fan 7 is arranged near the indoor heat exchanger 5.

On the other hand, 10 is a commercial AC power supply, to which the control unit 20 is connected. The control unit 20 controls the entire air conditioner, and includes a microcomputer and its peripheral circuits. Then, for the control unit 20, a speed switching circuit
An indoor temperature sensor 22, an operation unit 23 are connected. Further, the control unit 20 controls the supply of the power supply voltage to the compressor 1, the drive motor of the outdoor fan 6, and the speed switching circuit 21, respectively.

The speed switching circuit 21 converts the supplied power supply voltage into a voltage of a level according to a command from the control unit 20 and supplies it to the drive motor of the indoor fan 7. The operation section 23 is for inputting various operating conditions, and is provided with a manually operable air volume changeover switch 30 shown in FIG.

The air volume changeover switch 30 has three positions as "automatic switching position", "noise-oriented", "normal", "room temperature distribution-oriented", and "strong", "weak +", as manual switching positions in the manual switching mode. “Weak”, “Fine +”,
It has five positions of "fine".

Here, the "normal" position of the automatic switching positions corresponds to an automatic switching mode for automatically varying the speed of the indoor fan 7 according to the air conditioning load.

Here, when the "normal" position in the automatic switching mode is selected by the manual operation on the operation unit 23, the control unit 20 changes the speed of the indoor fan 7 to "strong" at the manual switching position according to the air conditioning load. The speed is variable in the speed range lower than "and higher than" fine "in the manual switching position.

Next, the operation of the above configuration will be described.

The operation unit 23 sets the cooling operation mode and the desired room temperature Ts, and sets the air volume changeover switch 30 to the "normal" position which is the automatic changeover mode. Then, the operation for starting operation is performed.

Then, the control unit 20 activates the compressor 1 and the outdoor fan 6, and also activates the indoor fan 7. That is, the cooling operation is started. Furthermore, the control unit 20 is an indoor temperature sensor.
The difference between the detected temperature (room temperature) Ta of 22 and the set temperature Ts is calculated, the temperature difference is compared with the air volume setting data stored in advance, and the speed switching circuit 21 of the speed switching circuit 21 is compared according to the comparison result. The output voltage, that is, the speed of the indoor fan 7 is controlled.

Thus, during the cooling operation, as shown in FIG. As the indoor temperature Ta approaches the set temperature Ts, the indoor fan 7
The speed decreases, and the air volume changes in three levels: "weak +", "weak", and "fine +". Further, even during the heating operation in which the four-way valve 2 is switched, as shown in FIG. 4, the air volume changes in three stages of “weak +”, “weak”, and “fine +”.

That is, the air volume "strong" in the maximum speed range is cut in the "normal" position, which is the automatic switching mode, and the speed lower than the maximum speed in the manual switching in the manual switching mode is set to solve the problem of indoor noise. Is. Further, the air volume in the lowest velocity range is cut to "fine", and a velocity higher than the lowest velocity in the manual switching mode is set to always obtain a good indoor temperature distribution.

Here, a little explanation of the indoor temperature distribution, basically, when the rotation speed of the indoor fan is lowered, the air volume decreases,
The arrival distance of the wind blown from the air conditioner is reduced.
As a result, when the rotation speed of the indoor fan is extremely low,
The wind does not spread all over the room, and the temperature distribution inside the room deteriorates. That is, at a position apart from the air conditioner, the room temperature is not controlled up to the temperature set in the air conditioner.

Here, the minimum speed of the "fine" indoor fan speed by manual operation is set to a speed that can prevent discomfort caused by the wind blown from the indoor fan hitting the body,
It is set lower than the fan speed that maintains a good temperature distribution throughout the room.

On the other hand, the lowest speed in the automatic switching mode needs to be controlled to an appropriate temperature throughout the room so that the occupants in the room feel a comfortable feeling as a whole. Therefore, by setting the lowest speed in the automatic switching mode higher than the lowest speed selected by the manual switching, the temperature distribution in the entire room can be kept good.

On the other hand, when the air volume changeover switch 30 is set to the "noise priority" position, the room temperature Ta approaches the set temperature Ts as shown in Fig. 5 during cooling operation and as shown in Fig. 6 during heating operation. Therefore, the air volume is "weak +", "weak", "fine +",
It changes in four steps, "fine".

In other words, the air volume "fine" in the lowest speed range is added to the air volume switching during "normal" to perform the operation with an emphasis on solving the problem of indoor noise.

Further, when the air volume selector switch 30 is set to the "room temperature distribution-oriented" position, the cooling operation is as shown in FIG.
During the heating operation, as shown in FIG. 8, as the room temperature Ta approaches the set temperature Ts, the air volume becomes “strong”, “weak +”, “weak”,
It changes in four steps, "fine +".

That is, the operation is performed with an emphasis on obtaining a good indoor temperature distribution by adding the air volume "strong" in the maximum speed range to the "normal" air volume switching.

By the way, the switching from the automatic switching position to the manual switching position can be appropriately executed.

The present invention is not limited to the above-mentioned embodiment, and can be variously modified without changing the gist.

[Advantages of the Invention] As described above, according to the present invention, in the manual switching mode, the indoor fan speed can be manually selected from a plurality of speeds including the highest speed and the lowest speed, while in the automatic switching mode, the indoor fan speed can be changed. The speed is lower than the maximum speed selected in the manual switching mode, and automatically changes according to the air conditioning load in a speed range larger than the minimum speed selected in the manual switching mode. It is possible to provide an air conditioner that can obtain a wide indoor temperature distribution.

[Brief description of drawings]

FIG. 1 is a diagram showing a configuration of an embodiment of the present invention, FIG. 2 is a diagram showing a specific configuration of an air volume changeover switch in the same embodiment, FIG. 3, FIG. 4, FIG. 5, FIG. 6, FIG. 7 and FIG. 8 are views for explaining the operation of the same embodiment,
FIG. 9 and FIG. 10 are views for explaining the operation of the conventional air conditioner. 7: indoor fan, 20: control unit, 21: speed switching circuit, 30: air volume switching switch.

Claims (1)

[Scope of utility model registration request] 1. An air conditioner comprising a manually operable operation unit and a manual switching mode for selecting a specific indoor fan speed from a plurality of speeds including the highest speed and the lowest speed by operating the operation unit, Means for selecting the automatic switching mode is provided in the operating portion, and when the automatic switching mode is selected by the operating portion, the speed of the indoor fan is less than the maximum speed selected in the manual switching mode and the manual switching mode. An air conditioner provided with a control means for automatically varying in accordance with an air conditioning load in a speed range larger than the minimum speed selected in.