JPH0621702B2 - Blower control device for air conditioner - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a blower control device for an air conditioner that has a damper that opens and closes an air outlet in an air conditioner that cools and heats a room.

[Prior Art] FIGS. 8 and 9 are disclosed in, for example, Japanese Patent Laid-Open No. 55-110853.
FIG. 1 is a side sectional view and an electric circuit diagram of a conventional air conditioner air blow control device disclosed in Japanese Patent Publication No.

In FIG. 8, the air conditioner main body 1 includes upper and lower fans 3 and 4 above and below the heat exchanger 2 in the front of the center of the main body, and the upper and lower outlets 5 and 5 are provided above and below the air conditioner main body 1, respectively. A lower air outlet 6 is provided to form a ventilation passage. In FIG. 9, 7 is a main switch, the compressor 10 is connected to one end of the room temperature thermostat 8, the other end is connected to the main switch 7, and the other end of the room temperature thermostat 8 is connected to the power source E side. ing. Further, the lower blower lower fan 4 is connected in parallel with the upper blower upper fan 3, and is connected to a power source E via a thermostat or a pressure switch 9.

The operation of the conventional air conditioning control device for the air conditioner configured as described above will be described.

First, when the main switch 7 is closed and the room temperature thermostat 8 is closed, the compressor 10 is operated, and at the same time, the upper fan 3 for upper blowing is energized to heat a certain temperature or pressure by the thermostat or the pressure switch 9. After the detection by the exchanger 2, the lower blower lower fan 4 is energized.

[Problems to be Solved by the Invention] Since the conventional air-blowing control device for the air conditioner is configured in this way, the cooling air is blown out at the upper outlet 5 during the cooling operation.
Only the cold air that has passed through the heat exchanger 2 and the warm air that does not pass through the heat exchanger 2 that enters from the lower outlet 6 in the opposite direction are mixed, and dew is condensed and blown out. Also, during heating operation,
There was a problem that the wind blown out from the upper outlet 5 became slower because of the cold air entering from the lower outlet 6 in the opposite direction.

Also, in the conventional type, the damper is opened and closed only by the heat exchanger temperature, so when the temperature of the heat exchanger is high, the damper is open even if the temperature of the indoor air is low, so cold air is blown during heating, which causes discomfort. There was a drawback.

Therefore, the present invention has been made to solve the above problems, and allows the user to select a desired operation mode, and the ventilation control of an air conditioner that allows comfortable cooling and heating air conditioning from the start of operation. The purpose is to obtain the device.

[Means for Solving the Problems] A blower control device for an air conditioner according to the present invention includes a heat exchanger installed opposite to a suction port provided in a central portion of a front surface of an air conditioner body, and a heat exchanger Upper and lower outlets formed in the upper and lower parts of the suction port facing the exchanger,
An upper fan and a lower fan which are arranged inside the upper and lower air outlets and circulate the indoor air, a damper which is arranged at the lower air outlet and opens and closes the outflow of the indoor air, and the damper. A driving means for driving and a blowing control means for controlling the driving means are provided, and the blowing control means includes a room temperature sensor for detecting a temperature of the indoor air circulating between the upper fan and the lower fan, and the heat A temperature sensor for detecting the temperature of the exchanger, a switch section for selecting an operation mode of the upper fan and the lower fan and an operation mode of cooling / heating, and the operation of the upper fan and the lower fan by this switch section. When the cooling operation is selected, the temperature of the room air detected by the room temperature sensor is compared with the judgment reference temperature, and the difference between the temperature of the room air and the room set temperature is determined. When the temperature difference is larger than the reference temperature difference, the drive means is controlled to open the damper, and when the heating operation is selected, the determination reference temperature is determined based on the temperature of the room air detected by the room temperature sensor, and the determination is made. When the temperature of the heat exchanger detected by the temperature sensor is compared with the determination reference temperature and the temperature of the heat exchanger is higher than the determination reference temperature, the driving means is controlled to open the damper. When the temperature of the heat exchanger is lower than the determination reference temperature, the drive means is controlled to close the damper, and even when the temperature of the heat exchanger is high, the damper is closed to blow air. And a control unit.

[Operation] In the present invention, when the operation of both the upper fan and the lower fan and the heating operation are selected by the switch section for selecting the operation mode of the upper fan and the lower fan and the operation mode of the cooling / heating, A sense of determining the determination reference temperature based on the temperature of the indoor air detected by the room temperature sensor that detects the temperature of the indoor air circulating between the fan and the lower fan, and detecting the determined determination reference temperature and the temperature of the heat exchanger. When the temperature of the heat exchanger detected by the temperature sensor is compared and the temperature of the heat exchanger is higher than the judgment reference temperature, the drive means is controlled to open the damper so that the temperature of the heat exchanger is higher than the judgment reference temperature. When it is low, the drive means is controlled to close the damper. Therefore, when the heat exchanger temperature is low,
The damper is closed, and even if the heat exchanger temperature is high,
When the temperature of the indoor air is low, the damper is closed, so that cold air is not always blown to the feet.

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

1 and 2 are a front view and a side sectional view of an indoor unit of an air conditioner to which the present invention is applied.

In the figure, 11 is an indoor unit, 12 is a heat exchanger arranged substantially in the center of the indoor unit 11, 13 is a suction port for indoor air provided in a portion facing the heat exchanger 12,
14 is an upper fan provided in the upper portion of the heat exchanger 12 facing the suction port 13, 15 is an upper outlet provided in a portion facing the upper fan 14, 16 is a lower fan provided in the lower portion of the indoor unit 11, Reference numeral 17 denotes a lower air outlet provided in a portion facing the lower fan 16. Lower outlet 1
A damper 18 for opening and closing the air outlet is attached to 7. The damper 18 is connected to a damper driving means 19a including a damper motor 19 and the like, and is configured to rotate about an axis. Reference numeral 20 is an upper fan motor that drives the upper fan 14, and 21 is a lower fan motor that drives the lower fan 16.

FIG. 3 shows an upper fan motor 20 and a lower fan motor 2.
FIG. 1 is a block diagram showing a blower control unit that controls a damper motor 19. In the figure, 23 is a power supply circuit that rectifies the output of the AC power supply 22 and supplies DC power to each circuit,
Reference numeral 24 denotes a microprocessor that constitutes a blower control unit, and includes an input circuit 25, a central processing unit (hereinafter, “CPU”).
26), a memory 27, and an output circuit 28. Reference numeral 29 denotes an upper fan motor 20 and a lower fan motor 2 according to a signal supplied from the output circuit 28.
1, a fan motor drive circuit for driving and controlling 1, a damper motor drive circuit for driving and controlling the damper motor 19 according to a signal supplied from the output circuit 28, a room temperature sensor 31 for detecting the intake air temperature, and a heat exchanger 12 A temperature-sensitive sensor 33 for detecting the temperature of 33 is a switch input unit for setting room temperature, warming and cooling modes, and selecting the operation of the upper fan 14 and the upper and lower fans 14 and 16.

A blower control device for an air conditioner configured as described above will be described with reference to FIG.

In Step 1, the operation of the upper fan 14 or the operation of the upper fan 14 and the lower fan 1 is performed by inputting the switch input unit 33.
It is judged whether the two units of No. 6 are in operation, and if there are two fans, it is judged at step S2 whether the input of the switch input unit 33 is cooling or heating. In the case of cooling, go to step S3,
The room temperature Ta detected by the room temperature sensor 31 is read into the CPU 26 via the input circuit 25 and compared with a constant value A [° C.] stored in the memory 27 in advance in step S4. Ta
If ≧ A, go to step S5.

In step S5, the difference between the room temperature set value Ts of the switch input unit 33 and the room temperature Ta is compared with a constant value B [° C.] stored in the memory 27 in advance, and if Ta−Ts ≧ B, step Go to S6, damper motor drive circuit 30
Is output to and the damper is opened. The damper motor drive circuit 30 has a limit switch (not shown)
When the damper motor 19 rotates for a certain period of time, it stops.

Next, in step S7, the room temperature Ta is detected again, and in step S8, Ta and A are compared. If Ta is less than A, the damper motor 19 in step S10 is driven, and the damper is closed when the damper motor 19 is rotated for a certain time and stopped. Also, Ta
If is greater than or equal to A, go to step S9, compare the difference between Ta and Ts with B, and if less than B, similarly perform step S9.
At 10 the damper closes.

On the other hand, in the case of heating in step S2, step S1
The heat exchanger temperature Tc detected by the temperature sensor 32 in 1 is read into the CPU 26 via the input circuit 25, and step S1
In step 2, the value is compared with a constant value C [° C.] stored in the memory 27 in advance. If Tc ≧ C, the process proceeds to step S13, and the damper motor 19 is stopped for a certain period of time and then stopped and the damper is opened.

Next, in step S14, the heat exchanger temperature Tc is again set.
Is detected, and if Tc is less than C in step S15, the process proceeds to step S16, and the damper motor 19 rotates for a fixed time and then stops to close the damper.

By thus defining the conditions of the damper opening / closing mode during the cooling operation and the opening / closing mode during the heating operation, comfortable cooling / heating air conditioning can be performed.

In the above description, the opening / closing of the damper is determined by detecting the temperature of the heat exchanger during the heating operation. However, as shown in FIG. 5, the blowout temperature can be changed depending on whether the room temperature is high or low. Thus, for example, in the case of heating in step S2, room temperature Ta is detected in step S17, and
In step 18, a constant value C [° C.] stored in the memory 27 in advance is determined based on the room temperature Ta detected in step S17. Next, in step S19, the heat exchanger temperature Tc detected by the temperature sensor 32 is read into the CPU via the input circuit 25, and in step S20, it is compared with the constant value C [° C.] previously stored in the memory 27, If Tc ≧ C, the process proceeds to step S21, the damper motor 19 is rotated for a certain period of time, and then stopped to open the damper.

Next, in step S22, the room temperature Ta is detected again,
Based on this room temperature Ta, a constant value C is obtained in step S23.
Determine [° C]. Then, the heat exchanger temperature Tc is detected in step S24, the above Tc and C are compared in step S25, and if the heat exchanger temperature Tc is less than the constant value C, the damper motor 19 is stopped after rotating for a predetermined time in step S26. The damper is closed.

According to an embodiment of this kind, the suction port 13 of the air conditioner body is
And a heat exchanger 12 built in so as to face the suction port 13 and the suction port 13
Of the air outlets 15 and 17 formed in the upper and lower portions of the fan, the upper fan 14 and the lower fan 15 disposed inside the air outlets 15 and 17, and the air outflow disposed in the lower air outlet 17. It comprises a damper 18 that opens and closes, a drive unit including a damper motor drive circuit 30 that drives the damper 18, and a blower control unit that controls this drive unit. The blower control unit includes the upper fan 14 and the lower fan 15. Room temperature sensor 31 for detecting the temperature of the indoor air circulating with, a temperature sensor 32 for detecting the temperature of the heat exchanger 12, operation modes of the upper fan 14 and the lower fan 15, and cooling / heating operation. A switch unit including a switch input unit 33 for selecting a mode, and the upper fan 14 and the lower fan 15 are connected by this switch unit.
When both the operation and the heating operation are selected, the determination reference temperature is determined based on the temperature of the indoor air detected by the room temperature sensor 31, and the determination reference temperature thus determined and the temperature sensitive sensor 32 are detected. The temperature of the heat exchanger 12 is compared with the temperature of the heat exchanger 12 when the temperature of the heat exchanger 12 is higher than the determination reference temperature by controlling the driving means to open the damper 18. Is lower than the judgment reference temperature, the damper is controlled by controlling the driving means.
And a blower control unit for closing.

Therefore, during heating operation, when the room temperature is low, if the difference between the room temperature Ta and the predetermined constant value C is increased, the blown air can be increased and the damper 1
It is also possible to change the temperature of the heat exchanger for opening and closing 8.

Therefore, in the cooling operation, the room temperature Ta is compared with a predetermined constant value A, Ta ≧ A, and the difference between the room temperature Ta and the indoor set temperature Ts is compared with a predetermined constant value B, and Ta −Ts ≧ B. At times, the damper 18 can be opened and then the damper 18 can be controlled according to the value of Ta or the difference between Ta and Ts.
From the time when the cooling operation is started, it is possible to perform an operation that achieves both high efficiency and comfort in terms of the room temperature level and the relationship between the room temperature and the set temperature difference.

Further, during the heating operation, the predetermined constant value C determined and the heat exchanger temperature Tc are compared depending on whether the room temperature Ta is high or low.
When ≧ C, the damper 18 is opened to prevent cold air from directly touching human skin when heating is started.

In this way, the switch input unit 33 is selected depending on the intention of the user.
You can select the operation mode of the upper fan 14 and the lower fan 16 with the switch part consisting of, energy is saved in the rapid cooling at the start of the cooling operation, and when the temperature approaches the set temperature, upper outlet cooling is performed, providing a comfortable cooling feeling. can get. In addition, during heating operation, it is possible to start with the upper air blow so that the cool air does not reach the living space directly and the lower air blow warms the feet so that the environment with good temperature distribution can be realized. Play.

Further, the switch input section 34 is provided in the embodiment shown in FIG. 3 so that the temperature of the heat exchanger for opening and closing the damper can be arbitrarily set like the different embodiment shown in FIG. The temperature can also be changed.

Furthermore, like the further different embodiment shown in FIG. 7, the switch input unit 35 which can ignore the condition for opening the damper in the embodiment shown in FIG. 3 and forcibly open the damper.
Can be provided to increase the amount of blown air and save operating energy.

[Advantages of the Invention] As described above, according to the blower control device for an air conditioner of the present invention, the determination reference temperature is determined based on the temperature of the indoor air in the heating operation, and the determined determination reference temperature and heat exchange are performed. Since the damper is opened and closed by comparing it with the reactor temperature, the damper is closed when the heat exchanger temperature is low, and
When the temperature of the indoor air is low, the damper is opened at a higher temperature of the heat exchanger so that cool air is not constantly blown to the feet and a comfortable temperature of the indoor air is sent to the air conditioner. A blower control device is obtained.

Further, in the cooling operation, the damper is controlled to open and close depending on whether the room temperature is high or low or the difference between the room temperature and the set temperature. That is, when the room temperature is high and the set temperature difference is large, the damper is opened to cool the room quickly, and when the temperature approaches the set temperature, the damper is closed to prevent the cold air from directly touching the feet, resulting in high efficiency and comfort. It is possible to provide a driving that is compatible with both sex. It is also designed to be able to follow load fluctuations during operation.

[Brief description of drawings]

1 and 2 are respectively a front view and a side sectional view of an indoor unit of an air conditioner equipped with a ventilation control device according to an embodiment of the present invention, and FIG. 3 is a damper motor shown in FIGS. 1 and 2. FIG. 4 is a flow chart showing a part of the operation of the circuit shown in FIG. 3, FIG. 5 is a flow chart showing an embodiment of the present invention, and FIGS. 6 and 7 are the present invention. FIG. 8 is a side sectional view and an electric circuit diagram of an indoor unit of an air conditioner showing a conventional example. FIG. In the figure, 11: indoor unit, 12: heat exchanger, 13: suction port, 14: upper fan, 15: upper outlet, 16: lower fan, 17: lower outlet, 18: damper, 19: damper motor, 24: microprocessor, 31: Room temperature sensor 32: temperature sensor 33, 34, 35: switch input section. In the drawings, the same reference numerals and symbols indicate the same or corresponding parts.

Claims (1)

[Claims] 1. A heat exchanger built in so as to face a suction port provided in the center of the front surface of an air conditioner body, and an upper part formed at the upper and lower parts of the suction port facing the heat exchanger. A lower air outlet, an upper fan and a lower fan that are arranged inside the upper and lower air outlets and circulate the indoor air, and a damper that is arranged at the lower air outlet and opens and closes the outflow of the indoor air. A driving means for driving the damper, and an air-blowing control means for controlling the driving means, wherein the air-blowing control means detects a temperature of the room air circulated by the upper fan and the lower fan at room temperature. A sensor, a temperature-sensitive sensor for detecting the temperature of the heat exchanger, a switch section for selecting an operation mode of the upper fan and the lower fan, and an operation mode of cooling / heating, and the switch section. When the operation of the fan and the lower fan and the cooling operation are selected, the temperature of the room air detected by the room temperature sensor is compared with a judgment reference temperature, and the difference between the temperature of the room air and the room set temperature is judged. When the temperature difference is larger than the reference temperature difference, the driving means is controlled to open the damper, and when the heating operation is selected, the determination reference temperature is determined based on the temperature of the room air detected by the room temperature sensor, and this determination is made. The judgment reference temperature is compared with the temperature of the heat exchanger detected by the temperature sensor, and when the temperature of the heat exchanger is higher than the judgment reference temperature, the driving means is controlled to open the damper. When the temperature of the heat exchanger is lower than the judgment reference temperature, the drive means is controlled to close the damper, and when the temperature of the heat exchanger is high and the indoor air temperature is low, the damper is closed. Blower control unit of an air conditioner which is characterized by comprising a blower control unit to.