JP2004125207A - Air conditioner and control method of air conditioner - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To solve the problem wherein a user feels a cold air feeling when cold air is blown off to the user for maintaining a vertical blade while still turning in the vertical direction though a blowoff wind is cold when a temperature of a heat exchanger drops since a refrigerant flows backward to an indoor machine by compressor stopping operation in thermostat OFF operation at heating operation time. <P>SOLUTION: In heating operation, when a heat exchanger temperature is higher than a prescribed temperature, the vertical blade is turned in the vertical direction, and when the temperature is lower than the prescribed temperature, the vertical blade is turned in the horizontal direction. When turning off a thermostat, when a prescribed time passes after turning off the thermostat, wind direction control is performed for turning the vertical blade in the horizontal direction. Thus, cold air is not blown off toward the user so that the cold air feeling is not imparted to the user. <P>COPYRIGHT: (C)2004,JPO

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to an air conditioner and a control method of the air conditioner, and more particularly, to a method of controlling a wind direction when a heating thermostat is turned off.
[0002]
[Prior art]
Conventionally, this type of air conditioner has an invention that controls upper and lower blades according to the temperature of a heat exchanger (for example, Patent Document 1). Specifically, when the temperature of the heat exchanger is higher than a predetermined temperature, the upper and lower blades are directed vertically, and hot air is blown in the vertical direction so that the temperature distribution in the room is made uniform. Further, when the temperature of the heat exchanger becomes lower than a predetermined temperature, the wind direction is controlled so that the upper and lower blades are directed in the horizontal direction and the cool air is not directed toward the user.
[0003]
[Patent Document 1]
JP-A-3-223880
[Problems to be solved by the invention]
However, in the above-described conventional configuration, when the so-called thermo-OFF operation occurs, such as when the indoor temperature reaches the set temperature of the air conditioner during the heating operation and the heating operation is temporarily stopped, the compressor is stopped. The circulation of the refrigerant is stopped, the pressure of the refrigerant is equalized, and the cooled refrigerant remaining in the evaporator of the outdoor unit flows into the heat exchanger of the indoor unit. The heat exchanger temperature detecting means for detecting the temperature of the heat exchanger that controls the upper and lower blades needs to be always provided at the part of the two-phase liquid in order to accurately detect the temperature during the heating operation. It is arranged almost in the center. Therefore, when the above-mentioned thermo-OFF operation occurs and the cooled refrigerant flows into the heat exchanger of the indoor unit, the temperature of the downstream portion of the heat exchanger decreases faster than that of the heat exchanger temperature detecting means, and the heat exchange is performed. Uneven temperature occurs in the vessel. As a result, depending on the position of the heat exchanger temperature detecting means, the heat exchanger temperature is detected to be higher than the predetermined temperature, and the upper and lower blades are kept vertically oriented, but the downstream portion of the heat exchanger is in a cold state. Therefore, there is a problem that the cold wind is directed toward the user and is blown out.
[0005]
An object of the present invention is to solve such a conventional problem, and an object of the present invention is to provide a wind direction control method that does not blow cold air toward a user even when a thermo-OFF operation occurs during a heating operation.
[0006]
[Means for Solving the Problems]
To solve the above problems, the present invention provides a heating operation, when the heat exchanger temperature is higher than a predetermined temperature, the upper and lower blades are oriented vertically, and when the heat exchanger temperature is lower than the predetermined temperature, the upper and lower blades are When the thermo-OFF is performed, the elapsed time after the thermo-OFF operation is detected, and when the elapsed time after the thermo-OFF reaches a predetermined time, the wind direction control for turning the upper and lower blades in the horizontal direction is performed.
[0007]
According to the above-described wind direction control method, even when temperature unevenness occurs in the heat exchanger at the time of thermo-OFF, the cool air is not blown out toward the user, so that the user can be prevented from feeling cool. Note that the above wind direction control performs the same control in all operations in which the compressor stops during the heating operation.
[0008]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to the drawings.
[0009]
(Embodiment 1)
FIG. 1 is a schematic configuration diagram of an air conditioner according to an embodiment of the present invention. In the figure, an indoor unit (1) includes a heat exchanger temperature detecting means for detecting the temperature of a heat exchanger (2), that is, a temperature detecting unit (3), a blower fan (4) for circulating blown air into a room, and a blowout port. (5) It is composed of upper and lower blades (6) for controlling the wind direction of the blown wind blown out by the blower.
[0010]
The temperature detector (3) must always be provided at the portion of the two-phase liquid in order to accurately detect the temperature during the heating operation, and is disposed substantially at the center of the heat exchanger (2). In the air conditioner having the above configuration, when the room temperature reaches the set temperature during the heating operation and a predetermined time has elapsed, the control unit determines that the thermostat is OFF, and starts the thermoOFF operation. The thermo OFF operation is an operation in which the compressor stops and the blower fan (4) decreases to a predetermined rotation speed.
FIG. 2 is a block diagram of a method of controlling the wind direction of the air conditioner according to the embodiment of the present invention. The temperature detector (11), the thermo-OFF judging unit (12), the timer means, ie, the timer (13), and the timer time A control unit or microcomputer (17) including a determination unit (14), a heat exchanger temperature determination unit (15), and a control signal output unit (16), and upper and lower blade driving means for driving the upper and lower blades, that is, a stepping motor (18) is provided.
[0011]
Next, the operation of the wind direction control method applied to the air conditioner having the above configuration will be described with reference to the flowchart of FIG.
[0012]
During the heating operation, the thermo-off judging section (12) compares the room temperature with the set temperature. If the room temperature has not reached the set temperature, the thermo-off is judged. If the room temperature has reached the set temperature, the thermo-off is determined. A determination is made (step 1). If it is determined that the thermo-on is performed, the temperature detection unit (11) detects the heat exchanger temperature t (Step 11). The heat exchanger temperature determination unit (15) determines the cool air feeling obtained from the experimental results for each model. The control signal is compared with a predetermined heat exchanger temperature T1 that is not felt (step 12). If t <T1, a control signal is output from the control signal output unit (16) to the stepping motor (18) (step 13). (6) is turned in the horizontal direction (step 14). If it is determined in step 12 that t ≧ T1, a control signal is output from the control signal output unit (16) to the stepping motor (18) (step 15), and the upper and lower blades (6) are directed vertically (step 16). . Thereafter, the process returns to step 1.
[0013]
If it is determined in step 1 that the thermo-off is performed, the thermo-off operation is started, the compressor is stopped, and the blower fan is reduced to a predetermined rotation speed (step 21). Next, the elapsed time j after the thermo-OFF is measured by the timer (13) (step 22). In the time-measurement time determining unit (14), a predetermined feeling that does not feel the feeling of cool air after the thermo-OFF is obtained for each model from the experimental result. (Step 23), and if j> J1, a control signal is output from the control signal output unit (16) to the stepping motor (18) (step 24), and the upper and lower blades (6) are Orient horizontally (step 25). Thereafter, the process returns to step 1. If it is determined in step 23 that j ≦ J1, the process proceeds to step 11.
[0014]
【The invention's effect】
As is clear from the above, in the present invention, during the heating operation, the compressor is stopped by the thermo OFF operation, the circulation of the refrigerant is stopped, the pressure of the refrigerant is equalized, and the cooled refrigerant that has accumulated in the evaporator of the outdoor unit Flows into the heat exchanger of the indoor unit, the rate of temperature decrease in the downstream part of the heat exchanger is faster than that of the heat exchanger temperature detecting means. After a predetermined time, the upper and lower blades are turned in the horizontal direction. Therefore, the cool air is not blown toward the user, and it is possible to prevent the user from feeling cool.
[Brief description of the drawings]
FIG. 1 is a schematic diagram of a configuration of an air conditioner showing a first embodiment of the present invention; FIG. 2 is a block diagram of a wind direction control method of the same embodiment; FIG. 3 is an operation flowchart of a wind direction control method of the same embodiment; Explanation of code]
2 heat exchanger 3 heat exchanger temperature detecting means 4 blower fan 6 upper and lower blades 11 temperature detecting unit 12 thermo OFF determining unit 13 timer 14 clocking time determining unit 15 heat exchanger temperature determining unit 16 control signal output unit 17 microcomputer 18 stepping motor

Claims (2)

At least a heat exchanger, a blower fan, upper and lower blades arranged at an outlet of a blower circuit, upper and lower blade driving means for rotating the upper and lower blades, and a heat exchanger temperature detector for detecting a temperature of the heat exchanger. A thermo-off operation determining means for determining the occurrence of a thermo-off operation during a heating operation, a time measuring means for measuring an elapsed time after the thermo-off operation, and the heat exchanger temperature detection. Heat exchanger temperature determining means and time measuring time determining means for comparing the heat exchanger temperature detected by the means and the time measured by the time measuring means with respective predetermined set values; and the heat exchanger temperature determining means And a control unit composed of control signal output means for outputting a control signal based on the determination result of the time measurement time determination means. Air conditioner, characterized in that to change the wind direction in the vertical direction by rotating the upper and lower blade by the vertical blade driving means in accordance with. In a heat exchanger, a blower fan, and an air conditioner having upper and lower blades disposed at an outlet of a blower circuit and controlling upper and lower wind directions, a thermo OFF state detecting step of determining a thermo OFF state, and a heat exchanger temperature. A heat exchanger temperature comparing step of detecting and comparing the heat exchanger temperature with a predetermined temperature, a time measuring time comparing step of measuring an elapsed time after thermo OFF and comparing the measured time with a predetermined time, Determining a wind direction of the upper and lower blades based on a comparison result in the heat exchanger temperature comparing step and the time counting time comparing step, and performing operation control.

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