JP2005055140A - Air conditioner - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an air conditioner capable of solving an increase in noise resulted from the rise of rotating speed of an indoor fan motor by starting of the fan motor at a highest rotating speed in restarting a compressor, while suppressing water leakage or foreign odor in the vicinity of an indoor unit. <P>SOLUTION: This air conditioner comprises the indoor fan motor 5 and a control part 6 for controlling the fan motor 5. The rotating speed of the indoor fan motor 5 is controlled based on a detection means for detecting a restart of thermo-on from a thermo-off state. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to an air conditioner, and more particularly to operation control of an indoor fan.

  In the conventional air conditioner, when the set temperature becomes higher than the sampled room temperature during the cooling operation, the compressor shifts to a period during which the compressor is stopped from the operating state (hereinafter, thermo-off). When the fan motor rotates during the thermo-off, water droplets adhering to the indoor heat exchanger whose temperature has risen evaporate, and the water vapor may come into contact with the cooled wind circuit. As a result, mold and the like may occur.

  Therefore, in order to solve the above-mentioned problem, there is known a control in which the compressor is started again during the thermo-off time by providing a period in which the indoor fan motor is repeatedly turned on and off at a low rotational speed for sampling the indoor temperature. (For example, refer to Patent Document 1). Hereinafter, a conventional air conditioner will be described with reference to FIG. FIG. 4 illustrates the case of cooling and dry operation. When cooling and dry operation operations are performed by the remote controller, the fan motor is rotationally controlled, and room temperature control is performed by cooling and dry operations (step a).

  During the cooling and dry operation, it is determined whether or not the rotational speed of the compressor is not more than a predetermined value of 18 rps, for example (step b). When the rotational speed of the compressor is larger than 18 rps, the cooling and dry operation is continued. When the rotational speed of the compressor becomes 18 rps or less, the process proceeds to step c, and the indoor heat exchange temperature is detected. Is higher than a predetermined value (for example, 15 degrees).

  If the indoor heat exchange temperature is 15 degrees or less, the process returns to step b. When the indoor heat exchange temperature becomes higher than 15 degrees, the process proceeds from step c to step d, the current control of the fan motor is stopped, and the operation is switched to intermittent operation. It is determined whether or not the indoor heat exchange temperature is a predetermined value of 3 degrees or less (step e). The indoor fan is intermittently controlled until the indoor heat exchange temperature becomes 3 degrees or less. When the indoor heat exchange temperature becomes 3 degrees or less, it is determined whether or not a predetermined time (for example, 3 minutes) has elapsed. (Step f). Until the elapse of 3 minutes, the process returns to step e, the indoor heat exchange temperature becomes 3 ° C. or less, and when this state continues for 3 minutes, the process proceeds from step f to step g to restart the fan motor.

After restarting the indoor fan, it is determined whether the operating frequency code instruction of the compressor is increased by a predetermined value (for example, 18 rps) by adjusting the room temperature (step h). If the rotation speed of the compressor does not exceed 18 rps, the process proceeds to step i, and it is determined whether or not the indoor heat exchange temperature is higher than a predetermined value (for example, 15 degrees) (step i). When the indoor heat exchange temperature is higher than 15 degrees, the process returns to step d, and the indoor fan is intermittently controlled. When the indoor heat exchange temperature is 15 degrees or less, the process returns to step h, and the rotation speed of the compressor is adjusted by adjusting the room temperature. Wait until it exceeds 18 rps. After the indoor fan is restarted, if the compressor rotation speed instruction is increased by 18 rps by adjusting the room temperature, the process returns from step h to step b, and the above steps are repeated until the cooling or dry operation is stopped or changed.
Japanese Patent Laid-Open No. 11-211206

  However, in the above conventional configuration, when the fan motor starts at the maximum speed when the compressor is restarted, the rotational speed of the indoor fan motor that was quiet during the thermo-off suddenly increases remarkably with the re-thermo-on, so the noise difference is severe and the On the other hand, there was a problem of giving discomfort. In addition, water droplets and odor components adhering to the indoor heat exchanger may blow out, and there is a problem of water wetting near the indoor unit and a strange odor. Even when the interior temperature is sufficiently cold, since the operation is performed at the maximum number of revolutions, unnecessary power is consumed, and there is a problem that energy is wasted.

  The present invention has been made in view of such a conventional problem, and can suppress noise generated at the time of re-thermo-on, maintain user comfort, and also have water and odor components attached to an indoor heat exchanger. An object of the present invention is to provide an air conditioner that can suppress the blowout of the air and reduce power consumption.

  In order to solve the above-described problems, the present invention controls the rotational speed of an indoor fan motor by using an indoor fan motor, a control unit that controls the indoor fan motor, and a detection unit that is used when the thermo-ON is restarted from the thermo-off state. is there.

  With this configuration, the fan motor maximum air volume is set to a lower air volume than at the start of operation when the thermostat is turned on again, so that the noise felt by the user when the number of rotations of the indoor fan motor increases is suppressed and the user feels uncomfortable. In addition, since the indoor heat exchanger is cooled before the thermo-off, the indoor air cooling capacity can be maintained even when the indoor fan motor rotation speed is suppressed during the re-thermo-on, and the power consumption can be reduced as a result.

  As described above, according to the present invention, when the thermostat is turned off, the indoor fan motor is operated at a low rotational speed for a certain period of time for sampling the room temperature, and then intermittent operation is repeated for a certain period of time. Is set to a lower airflow than at the start of operation, so that the noise felt by the user when the number of rotations of the indoor fan motor increases is reduced and the user is not discomforted. Since the exchanger is cooled, the cooling capacity of the indoor air can be maintained even when the rotational speed of the indoor fan motor is suppressed when the thermostat is turned on again. As a result, power consumption can be reduced.

  Hereinafter, embodiments of the present invention will be described with reference to FIGS. 1 to 3.

(Embodiment 1)
FIG. 1 is a refrigeration cycle diagram showing the configuration of an air conditioner according to Embodiment 1 of the present invention, FIG. 2 is a flowchart showing the operation of the air conditioner according to Embodiment 1 of the present invention, and FIG. It is a signal waveform diagram of the air conditioner in the first embodiment.

  Compressor 1 that compresses and discharges refrigerant, indoor heat exchanger 2 that exchanges heat between the refrigerant and indoor air, evaporator 3 that adiabatically expands the refrigerant, and outdoor heat exchange that exchanges heat between the refrigerant and outdoor air It is comprised with the container 4.

  The control apparatus to which the air conditioner control method of the present invention is applied includes an indoor fan motor 5 that drives a fan for sending air heat exchanged by the indoor heat exchanger 2 into the room, and a difference between room temperature and a set temperature. The operation tap is calculated, the result is transmitted to the outdoor control unit 7, the indoor control unit 6 that controls the rotation speed of the fan motor 5 according to the set air volume, and the operation tap received from the indoor control unit 6, the compressor 1 It is comprised by the outdoor control part 7 which controls rotation speed. The indoor control unit 6 includes a temperature setting unit 9 and a temperature detection unit 8. The temperature setting unit 9 sets a target indoor temperature, and the temperature detection unit 8 detects the indoor temperature.

  Next, the control operation at the time of cooling in the above-described air conditioner will be described with reference to the flowchart of FIG. 2 as an example of the case where the fan motor airflow is set in three stages. First, when the operation of the air conditioner is started and the cooling operation is selected (step a), and further when the automatic operation is selected (step b), the indoor unit control unit performs a fan motor to cool the room temperature in an early time. The rotational speed of 1 is determined to be the fastest Hi (step c). Thereafter, air conditioning is performed at the rotational speed of the fan motor 1 set according to the set temperature and room temperature.

  When the set temperature becomes higher than the room temperature during the cooling operation, the thermo-off is performed (step d). During the thermo-off, the control of the fan motor 1 is switched from the predetermined rotation speed to the intermittent operation (step e). In this intermittent operation, the indoor fan motor is operated for a certain period of time at the minimum rotation speed Lo for sampling the indoor temperature, and then stopped for a certain period of time. By this intermittent operation, the water droplets adhering to the fins evaporate, and the water vapor touches the cooled wind circuit to re-condensate and blow out of odor components.

  Thereafter, when the re-thermo-on condition is satisfied, the cooling operation is restarted (step f, step g). When the thermostat is turned on again, the maximum air volume of the fan motor 1 is suppressed to Me. As a result, it is possible to suppress the generation of noise felt by the user when the number of rotations of the indoor fan motor increases at the time of re-operation, and to air-condition the room without causing discomfort to the user. Since the indoor heat exchanger is cooled, the ability to sufficiently cool the air in the room can be maintained even when the rotational speed of the indoor fan motor is suppressed when the thermostat is turned on again. As a result, power consumption can be reduced. Thereafter, after the thermo-off, the maximum air volume of the fan motor 1 is repeatedly controlled to Me.

  In the above description, the fan motor rotation speed is set to three stages, but a plurality of air volume settings may be used. For example, switching of five stages such as SH, Hi, Me, Lo, and SLo may be used. good. In that case, the same result can be obtained by setting the maximum air volume at the time of re-thermo-on to Hi or less or Me or less.

  As described above, according to the present embodiment, when the indoor fan motor 5 is operated at a low rotational speed for a certain period of time for sampling the room temperature at the time of the thermo-off, and then intermittently operated repeatedly for a certain period of time. By setting the fan motor maximum air volume to a lower air volume than at the start of the operation, the indoor control unit 6 suppresses noise felt by the user when the number of rotations of the indoor fan motor 5 increases, and does not cause discomfort to the user. In addition, since the indoor heat exchanger is cooled before the thermo-off, the cooling capacity of the indoor air can be maintained even when the rotational speed of the indoor fan motor 5 is suppressed at the time of the re-thermo-on, and as a result, power consumption can be reduced.

Refrigeration cycle diagram showing the configuration of the air conditioner according to Embodiment 1 of the present invention. The flowchart which shows operation | movement of the air conditioner in Embodiment 1 of this invention. Signal waveform diagram of the air conditioner in Embodiment 1 of the present invention Flow diagram showing the operation of a conventional air conditioner

Explanation of symbols

5 Indoor fan motor 6 Indoor control unit 7 Outdoor control unit 8 Temperature detection unit 9 Temperature setting unit

Claims (1)

A temperature setting unit that sets a target indoor temperature, an indoor fan motor that drives a fan provided in an indoor unit installed in the indoor room, an indoor temperature detection unit that detects the temperature of the indoor room, An indoor control unit that controls at least the number of rotations of the indoor fan motor from the temperature setting unit and the room temperature detection unit; An air conditioner characterized in that the number of rotations of the indoor fan motor is reduced.

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