JP2008281247A - Operation control method of air conditioner - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To solve a problem that comfort is degraded as cold air is directly sent to a human body as a blade angle is fixed for dew condensation preventing control by lowering an operational frequency of a compressor and simultaneously fixing the blade angle when a detected indoor heat exchange temperature is lower than a set temperature, in a ceiling-embedded indoor machine comprising a wind direction changing blade disposed on a supply opening and a driving device. <P>SOLUTION: In this operation control method, the operational frequency of the compressor is decreased when an indoor pipe temperature becomes lower than a set temperature, and a temperature of a pipe for fixing an angle of the wind direction changing blade is independently determined as a second set value, so that the wind direction changing blade 11 is fixed when the temperature of the pipe becomes further lower than the second set value, thus a range of the operation performed in a state of fixing the blade angle can be narrowed, and a cooling operation can be performed without degrading comfort. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to an operation control method for an air conditioner.

Conventionally, the operation control method for this type of air conditioner has a method of detecting the inside / outside air temperature and the indoor heat exchanger temperature as shown in the flowchart of FIG. 17, the time chart of FIG. 18, and the block diagram of FIG. The dew condensation state is estimated, the operating frequency of the compressor is lowered, and the wind direction changing blade angle is changed to an angle at which water droplets are hardly attached to prevent the water droplets from dropping (see, for example, Patent Document 1).
JP-A-6-123477

  However, in the conventional configuration, since the compressor operating frequency is lowered and at the same time, the wind direction changing blade angle is changed to an angle at which water drops are difficult to be attached, the cold wind directly hits the human body and has a problem that the comfort is remarkably impaired. It was.

  The present invention solves the above-mentioned conventional problem. When the indoor heat exchange temperature reaches the set value, the compressor operating frequency is lowered first, and when the heat exchange temperature is further lowered, the angle of the wind direction changing blade is the most water droplet. An object of the present invention is to provide an operation control method for an air conditioner that can prevent condensation at the outlet without changing comfort by changing to a difficult angle.

  In order to solve the above-described conventional problems, an air conditioner operation control method according to the present invention includes a compressor operation frequency detection means, an indoor suction temperature detection means, an outdoor suction temperature detection means, an indoor blower speed detection means, and a wind direction change blade. An angle detection means, during cooling or dehumidifying operation, when the indoor blower is below the set speed, after a predetermined time from the start of operation, the indoor suction temperature is above the set value, and the outdoor suction temperature is below the set value, When the pipe temperature falls below the first set value, the compressor operating frequency is lowered, and when the indoor pipe temperature falls below the second set value, the wind direction changing blade is fixed at the set angle. This makes it possible to prevent condensation at the indoor unit outlet.

  The air conditioner blower control method of the present invention comprises a compressor operating frequency detection means, an indoor suction temperature detection means, an outdoor suction temperature detection means, an indoor blower speed detection means, and a wind direction change blade angle detection means. Or, during the dehumidifying operation, when the indoor blower is below the set speed, after a predetermined time from the start of operation, when the indoor suction temperature is above the set value, and the outdoor suction temperature is below the set value, the indoor piping temperature is the first set value. If the value is less than, the compressor operating frequency is lowered, and at the same time, the timer count is turned ON, and when the timer reaches the set time, the wind direction changing blade is fixed at the set angle. This makes it possible to prevent condensation at the indoor unit outlet.

  The operation control method for an air conditioner of the present invention can prevent dew condensation at the indoor outlet without impairing comfort.

The first invention comprises a compressor operating frequency detection means, an indoor suction temperature detection means, an outdoor suction temperature detection means, an indoor blower speed detection means, and a wind direction change blade angle detection means, and during cooling or dehumidifying operation, When the blower is below the set speed, after a predetermined time from the start of operation, when the indoor suction temperature is above the set value and the outdoor suction temperature is below the set value, the compressor operation is started when the indoor pipe temperature falls below the first set value. When the frequency is lowered and the indoor pipe temperature is lower than the second set value, the wind direction changing blade is fixed at the set angle, so that condensation on the indoor unit outlet can be prevented without impairing comfort.

  The second invention is the operation control method according to the first invention, particularly in the cooling or dehumidifying operation, in which the indoor fan is at a set speed or less, a predetermined time after the start of operation, and the indoor suction temperature is at or above a set value. When the intake pipe temperature is below the set value, if the indoor piping temperature falls below the first set value, the compressor operating frequency is lowered. At the same time, the timer count is turned on and the airflow direction change blade is set to the set angle when the timer reaches the set time. By fixing, it is possible to prevent condensation in the indoor outlet without impairing comfort.

  The third aspect of the invention relates to the operation control method of the first aspect of the invention or the second aspect of the invention, particularly in the cooling or dehumidifying operation, when the indoor blower is below the set speed, after a predetermined time from the start of operation, and the indoor suction temperature is set. When the outdoor suction temperature is equal to or higher than the value and the outdoor suction temperature is equal to or lower than the set value, the compressor operating frequency is lowered when the indoor pipe temperature falls below the first set value, and the pipe temperature falls below the second set temperature and the compressor When the operating frequency is lowered, the wind direction changing blade is fixed at a set angle, so that condensation in the indoor outlet can be prevented without impairing comfort.

  According to a fourth aspect of the present invention, in particular, the operation control method according to any one of the first to third aspects of the present invention is the same as that in the cooling or dehumidifying operation. When the outside air temperature falls below the first set value, the compressor operating frequency is lowered, and when the outside air temperature falls below the second set temperature, the wind direction changing blade is fixed at the set angle. As a result, it is possible to prevent condensation at the indoor outlet without impairing comfort.

  The fifth aspect of the invention relates to the operation control method of any one of the first to fourth aspects of the invention, in particular, in the cooling or dehumidifying operation, when the indoor fan is below the set speed, after a predetermined time from the start of operation, and the outdoor suction temperature. Is below the set value, the compressor operating frequency is lowered when the indoor suction temperature exceeds the first set value, and further the wind direction when the suction temperature is below the first set temperature and above the second set value. By fixing the change blade at a set angle, it is possible to prevent condensation in the indoor outlet without impairing comfort.

  Embodiments of the present invention will be described below with reference to the drawings. Note that the present invention is not limited to the embodiments.

(Embodiment 1)
FIG. 1 is a refrigeration cycle diagram showing an operation control method in an embodiment of the present invention. In the figure, the refrigeration cycle includes a variable capacity compressor 1, a four-way valve 2 for switching between cooling operation and heating operation, an outdoor heat exchanger 3, an outdoor blower 4, an outdoor air temperature sensor 5, an electric expansion valve 6, and an indoor heat exchanger. 7, an indoor piping temperature sensor 8, an indoor suction temperature sensor 9, an indoor blower 10, an indoor wind direction changing blade 11, and an indoor blade driving device 12. When the four-way valve 2 is switched during the heating operation, the refrigerant flows in the direction of the arrow in FIG.

  FIG. 2 is a block diagram of the operation control method for the air conditioner according to Embodiment 1 of the present invention. The operation of the air conditioner operation control will be described with reference to the flowchart of FIG. 3 and the time chart of FIG.

  During cooling or dehumidifying operation, after the compressor has been turned on for 20 minutes, when the indoor fan speed is Lo, the indoor suction temperature is equal to or higher than the set Tsi and the outdoor suction temperature is equal to or lower than the set value Tso, the indoor pipe temperature is the first set value. If it falls below Th1, dew prevention control will be entered, and the compressor operating frequency will decrease. At this time, the wind direction changing blade provided at the outlet can freely move at an angle set by the user. However, when the indoor piping temperature decreases and falls below the second set value Th2, the wind direction changing blade angle is fixed at the angle 1.

  Here, the blade angle 1 is set to an angle at which the ventilation resistance is the smallest and the air volume of the indoor unit takes the maximum value, and therefore condensation on the outlet can be minimized. Thereby, dew condensation at the indoor unit outlet can be prevented.

(Embodiment 2)
FIG. 5 is a block diagram of an operation control method for an air conditioner according to Embodiment 2 of the present invention. The operation control of the air conditioner will be described with reference to the flowchart of FIG. 6 and the time chart of FIG.

  During cooling or dehumidifying operation, after the compressor has been turned on for 20 minutes, when the indoor fan speed is Lo, the indoor suction temperature is equal to or higher than the set Tsi and the outdoor suction temperature is equal to or lower than the set value Tso, the indoor pipe temperature is the first set value. When it falls below Th1, dew prevention control is entered and the timer count is reset, and at the same time the compressor operating frequency decreases. At this time, the wind direction changing blade provided at the outlet can freely move at an angle set by the user. When the set time td elapses after the dew control entry, the wind direction changing blade angle is fixed at the angle 1.

  Here, the blade angle 1 is set to an angle at which the ventilation resistance is the smallest and the air volume of the indoor unit takes the maximum value, and therefore condensation on the outlet can be minimized. Thereby, dew condensation at the indoor unit outlet can be prevented.

(Embodiment 3)
FIG. 8 is a block diagram of an operation control method for an air conditioner according to Embodiment 3 of the present invention. The operation of the air conditioner operation control will be described with reference to the flowchart of FIG. 9 and the time chart of FIG.

  During cooling or dehumidifying operation, after the compressor has been turned on for 20 minutes, when the indoor fan speed is Lo, the indoor suction temperature is equal to or higher than the set Tsi and the outdoor suction temperature is equal to or lower than the set value Tso, the indoor pipe temperature is the first set value. If it falls below Th1, dew prevention control will be entered, and the compressor operating frequency will decrease. At this time, the wind direction changing blade provided at the outlet can freely move at an angle set by the user. When the compressor frequency down count reaches the set count n, the wind direction changing blade angle is fixed at the angle 1.

  Here, the blade angle 1 is set to an angle at which the ventilation resistance is the smallest and the air volume of the indoor unit takes the maximum value, and therefore condensation on the outlet can be minimized. Thereby, dew condensation at the indoor unit outlet can be prevented.

(Embodiment 4)
FIG. 11 is a block diagram of an air conditioner operation control method according to Embodiment 4 of the present invention. The operation of the air conditioner operation control will be described with reference to the flowchart of FIG. 12 and the time chart of FIG.

During cooling or dehumidifying operation, after the compressor has been turned on for 20 minutes, when the indoor fan speed is Lo, the indoor suction temperature is equal to or higher than the set Tsi, and the outdoor suction temperature is equal to or lower than the set value Tso1, the indoor pipe temperature is the first set value. If it falls below Th1, dew prevention control will be entered, and the compressor operating frequency will decrease. At this time, the wind direction changing blade provided at the outlet can freely move to an angle set by the user. When the outdoor suction temperature further falls below the set value Tso2, the wind direction changing blade angle is fixed at an angle 1.

  Here, the blade angle 1 is set to an angle at which the ventilation resistance is the smallest and the air volume of the indoor unit takes the maximum value, and therefore condensation on the outlet can be minimized. Thereby, dew condensation at the indoor unit outlet can be prevented.

(Embodiment 5)
FIG. 14 is a block diagram of an air conditioner operation control method according to Embodiment 5 of the present invention. The operation of the air conditioner operation control will be described with reference to the flowchart of FIG. 15 and the time chart of FIG.

  During cooling or dehumidifying operation, after the compressor has been turned on for 20 minutes, the indoor fan speed is Lo, the indoor suction temperature is equal to or higher than the set Tsi1, and the outdoor suction temperature is equal to or lower than the set value Tso1, the indoor pipe temperature is the first set value. If it falls below Th1, dew prevention control will be entered, and the compressor operating frequency will decrease. At this time, the wind direction changing blade provided at the outlet can freely move at an angle set by the user. When the indoor suction temperature is equal to or higher than Tsi1 and lower than the set value Tsi2, the wind direction changing blade angle is fixed at angle 1.

  Here, the blade angle 1 is set to an angle at which the ventilation resistance is the smallest and the air volume of the indoor unit takes the maximum value, and therefore condensation on the outlet can be minimized. Thereby, dew condensation at the indoor unit outlet can be prevented.

Refrigeration cycle diagram of the operation control method showing the first embodiment of the present invention The block diagram of the operation control method which shows the 1st Embodiment of this invention. The flowchart of the operation control method which shows the 1st Embodiment of this invention. The time chart of the operation control method which shows the 1st Embodiment of this invention The block diagram of the operation control method which shows the 2nd Embodiment of this invention. The flowchart of the operation control method which shows the 2nd Embodiment of this invention. Time chart of the operation control method showing the second embodiment of the present invention The block diagram of the operation control method which shows the 3rd Embodiment of this invention. The flowchart of the operation control method which shows the 3rd Embodiment of this invention. Time chart of the operation control method showing the third embodiment of the present invention The block diagram of the operation control method which shows the 4th Embodiment of this invention. The flowchart of the operation control method which shows the 4th Embodiment of this invention. Time chart of the operation control method showing the fourth embodiment of the present invention The block diagram of the operation control method which shows the 5th Embodiment of this invention. The flowchart of the operation control method which shows the 5th Embodiment of this invention. Time chart of the operation control method showing the fifth embodiment of the present invention Flowchart of conventional operation control method Time chart of conventional operation control method Block diagram of conventional operation control method

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Compressor 2 4-way valve 3 Outdoor heat exchanger 4 Outdoor blower 5 Outdoor air temperature sensor 6 Electric expansion valve 7 Indoor heat exchanger 8 Indoor piping temperature sensor 9 Indoor suction temperature sensor 10 Indoor blower 11 Indoor wind direction change blade 12 Indoor blade drive apparatus

Claims (5)

An air conditioner comprising an indoor heat exchanger, a blower, a drive circuit that drives the blower, a wind direction change blade that is disposed at the outlet and changes the direction of the blown wind, and a drive circuit that drives the wind direction change blade The indoor unit includes an indoor suction temperature detection means, an outdoor suction temperature detection means, a compressor operating frequency detection means, an indoor blower speed detection means, and a wind direction change blade angle detection means. When the blower speed is less than the set speed, after a predetermined time from the start of operation, when the indoor suction temperature is greater than or equal to the set value, and the outdoor suction temperature is less than or equal to the set value, the compressor when the indoor pipe temperature falls below the first set value The operation of the air conditioner is characterized in that when the operating frequency is lowered and the indoor piping temperature falls below the second set value, the wind direction changing blade angle is fixed to the set angle. Control method. During cooling or dehumidifying operation, if the indoor piping temperature falls below the first set value, the compressor operating frequency is lowered to the first set value, and at the same time, the timer count is turned on. The operation control method for an air conditioner according to claim 1, wherein the angle is fixed to a set angle. During cooling or dehumidifying operation, if the indoor pipe temperature falls below the first set value, the compressor operating frequency is lowered to the first set value, and the indoor pipe temperature is further lowered to cause the compressor operating frequency to be the second set value. 3. The operation control method for an air conditioner according to claim 1, wherein the wind direction changing blade angle is fixed to a set angle when the value decreases to a value. During cooling or dehumidifying operation, if the outdoor suction temperature falls below the first set value, the compressor operating frequency is lowered, and if the outdoor suction temperature falls below the second set value, the wind direction changing blade angle is set to the set angle. The operation control method for an air conditioner according to any one of claims 1 to 3, wherein the operation control method is performed. During cooling or dehumidifying operation, the compressor operating frequency is lowered when the indoor suction temperature is equal to or higher than the first set value, and the indoor suction temperature is decreased to fall below the first set value and above the second set value. The air conditioner operation control method according to any one of claims 1 to 4, wherein the wind direction changing blade angle is fixed at a set angle at a certain time.