JP2606774B2 - 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 a method for detecting filter clogging of an air conditioner.

[0002]

2. Description of the Related Art A filter is mounted on the front side of an indoor heat exchanger of an air conditioner to remove dust and the like in the intake air. When the filter is clogged by dust or the like attached thereto. , The amount of ventilation to the heat exchanger decreases, and the heat exchange between refrigerant and air becomes insufficient,
As a result, the heat exchanger may be frosted and frozen.

Conventionally, in order to prevent this state from occurring, a thermistor is provided on the surface of the heat exchanger or a connection pipe to the heat exchanger, and the temperature detected by the thermistor falls to a predetermined temperature or lower. In addition, when the time equal to or lower than the predetermined temperature continues for a predetermined time, the outdoor unit is controlled to be stopped, thereby notifying the user of filter clogging and preventing frost and freezing.

[0004]

However, in such a conventional example, in an air conditioner having a heating function in which it is necessary to control the temperature of the air blown from the indoor unit, the heat of the indoor unit has been conventionally known. Since there is a thermistor near the exchanger, it can be controlled using this thermistor.However, the air conditioner for cooling only has a structure in which the thermistor is attached only for this control. However, there is a problem that the cost is increased by the amount.

[0005]

SUMMARY OF THE INVENTION An object of the present invention is to prevent frost and freezing from occurring in a heat exchanger when clogging of a filter occurs. In order to achieve this object, the invention according to claim 1 is a method of controlling the number of revolutions of an indoor blower of an air conditioner, wherein the number of revolutions is adjusted by increasing or decreasing a voltage applied to the indoor blower motor including a rotation sensor. Thus, while controlling to the target rotation speed, when the voltage applied to the blower motor for maintaining the target rotation speed is reduced by a certain value or more than the voltage value required in normal, the indoor heat exchanger Then, the outdoor unit which serves as a means for sending the heat, exchanging heat, compressing the evaporated and vaporized refrigerant, further condensing it by heat exchange with the outside air, and sending it in a state capable of evaporating again is stopped. According to a second aspect of the present invention, in the method for controlling the number of revolutions of an indoor blower of an air conditioner, the number of revolutions is detected by a rotation sensor while selecting the number of application voltage switching taps applied to the blower motor. When the rotation speed of the blower motor is increased by a certain value or more from a normal rotation speed, the blown motor is sent to the indoor heat exchanger, exchanges heat, compresses the evaporated and vaporized refrigerant, and further communicates with external air. The outdoor unit, which serves as a means for condensing by heat exchange and sending it into a state capable of evaporating again, is stopped.

[0006]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a diagram showing one embodiment of the present invention.
First, the configuration will be described. Reference numeral 1 denotes an indoor heat exchanger, and a filter 2 is attached to a front surface of the indoor heat exchanger 1 to remove dust and the like in the intake air. Reference numeral 3 denotes a blower motor. A rotation sensor 4 is attached to the blower motor 3, and the control device 5 increases or decreases the voltage applied to the blower motor 3, and controls the signal sent from the rotation sensor 4 to be as desired.

[0007] A blower blade 6 is connected to the blower motor 3, and the air volume changes according to the rotation of the blower motor 3. A light receiving unit 7 receives a signal from the remote operation device 8 and transmits the signal to the control device 5. The remote control device 8 includes a start / stop switch 9, an air volume changeover switch 10, a temperature setting switch 11, and the like.

Each time the air volume changeover switch 10 is pressed, the air volume changeover switch 10 is switched in the order of strong → medium → weak → automatic → strong, so that the rotation speed of the blower motor 3 is changed. Reference numeral 13 denotes a display unit for displaying a power supply, a timer, an outdoor unit operation, and the like.

[0009]

Next, the operation will be described. Operation of remote control device 8 /
When the stop switch 9 is pressed, if the indoor temperature is higher than the set temperature of the thermometer, the outdoor unit (not shown ,
Heat, exchange heat, compress the evaporated and vaporized refrigerant,
Condensed (liquefied) by heat exchange with outside air
(An outdoor unit serving as a means for sending in a state capable of evaporating and evaporating ) begins to operate, and the liquid refrigerant sent to the indoor heat exchanger 1 exchanges heat with the air sucked in by the rotation of the blower motor 3 and the blower blades 6. By doing so, the air is cooled, and the cooled air is blown out to perform a cooling operation.

At the time of the cooling operation, the rotation speed of the blower motor 3 is adjusted by the user by pressing the air volume changeover switch 10 of the remote controller 8 for convenience such as “strong”, “medium”, “weak”, or the like. The control unit 5 is determined by selecting the air volume.
However, the rotation number is detected by the rotation sensor 4 and the indoor blower 3
By controlling the voltage applied to the motor, control is performed so that the target rotation speed for each preset air flow is achieved.

Here, when the filter 2 is clogged by dust or the like in the sucked air, the load on the blower motor 3 decreases, and the rotation speed increases. Then, the control device 5 performs control so as to reduce the voltage applied to the blower motor 3 and maintain the target rotation speed. However, when the blockage progresses, even if the operation is performed at the target rotation speed, the suction resistance increases due to the blockage of the filter 2 and the air volume decreases, so that the heat exchange becomes insufficient. Frost and freezing occur.

In order to prevent this, the outdoor unit is stopped when the voltage applied to the blower motor 3 is lower than a required voltage value in a normal state by more than a certain value.
To prevent frost formation and freezing, and warn the user that the filter 2 is clogged.

[0013]

As described above, according to the present invention, the target rotation speed is controlled by adjusting the voltage applied to the blower motor 3 having a built-in rotation sensor so that the target rotation speed is achieved. When the applied voltage to the blower motor 3 for maintaining is reduced by a certain value or more from a voltage value required in a normal state, the refrigerant is sent to the indoor heat exchanger 1, exchanges heat, and evaporates and vaporizes the refrigerant. By compressing, condensing (liquefying) by heat exchange with the outside air, and stopping the outdoor unit which is a means for feeding in a state where it can be evaporated again, when the clogging of the filter 2 occurs, the heat exchanger 1 In addition to preventing frost and freezing in
The effect of being able to warn the user of the clogging of the filter 2 is obtained.

[0014]

[Other Embodiments] If the air conditioner is of a type in which the voltage applied to the blower motor 3 is controlled by the blower motor 3 having a built-in rotation sensor 4 so as to reach a target rotation speed, the blower motor is used. No. 3 can obtain the same effect without distinction between DC and AC.

When a tap-switching type blower motor which does not particularly control the rotation speed is used, the rotation speed of the blower motor 3 is constant unless the tap is changed, but if the filter 2 becomes clogged. As a result, the load on the blower motor 3 decreases due to an increase in the suction resistance, and the rotation speed increases.

By utilizing this fact, when the control device 5 detects that the rotational speed has increased by a certain degree or more with respect to the normal rotational speed, the control device 5 judges that the filter 2 is closed and stops the outdoor unit. Perform control. Therefore, even in an air conditioner using a blower motor that does not perform rotation speed control, if the blower motor incorporates a rotation sensor,
The same effect can be obtained.

[Brief description of the drawings]

FIG. 1 is an overall structural diagram of an embodiment of an air conditioner indoor unit of the present invention.

FIG. 2 is a sectional view taken along line AA in FIG.

3A and 3B are diagrams illustrating an embodiment of the present invention, and FIG. 3A is a diagram illustrating a change in a voltage applied to a blower motor with respect to a degree of filter clogging in a case where rotation speed is controlled;
(B) is a figure which shows the change of the rotation speed of the blower motor with respect to the degree of filter clogging when rotation speed control is not performed.

[Explanation of symbols]

 REFERENCE SIGNS LIST 1 indoor heat exchanger 2 filter 3 blower motor 4 rotation sensor 5 controller 6 blower blade 7 light receiving unit 8 remote control device 9 start / stop switch 10 air volume changeover switch 11 temperature setting switch 12 timer switch 13 display unit

Claims (2)

(57) [Claims] In the method for controlling the number of revolutions of an indoor blower of an air conditioner, the number of revolutions is adjusted to a target number of revolutions by adjusting a voltage applied to the indoor air blower motor having a built-in rotation sensor. While controlling, when the applied voltage to the blower motor for maintaining the target rotation speed is reduced by a certain value or more from a voltage value required in a normal state, the voltage is sent to the indoor heat exchanger, heat exchange is performed, and evaporation is performed. An air conditioner wherein an outdoor unit serving as a means for compressing the refrigerant vaporized, condensing it by heat exchange with external air, and sending it in a state capable of evaporating again is stopped. 2. A method for controlling the number of revolutions of an indoor blower of an air conditioner, wherein the number of revolutions is controlled by means for selecting a voltage switching tap applied to the blower motor, and the rotation of the blower motor detected by a rotation sensor. When the rotation speed increases by more than a certain value from the normal rotation speed, it is sent to the indoor heat exchanger, exchanges heat, compresses the evaporated and vaporized refrigerant, and further condenses by heat exchange with external air. An air conditioner wherein an outdoor unit serving as a means for feeding in a state capable of evaporating again is stopped.