JP2008116068A - Air conditioner - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To solve a problem on degradation of comfort caused by frequent thermostat-off after a room temperature reaches a temperature set by a remote control device. <P>SOLUTION: In this air conditioner, a lower limit frequency is corrected after the room temperature reaches the temperature set by the remote control device. Here, criteria of judgement whether the capacity of the air conditioner is excess or not, are provided. The first is that the correction is performed when the stored number of times of occurrence of thermostat-off reaches a certain criterion. The second is that the occurrence frequency of thermostat-off is measured, and the correction is performed when the occurrence frequency is equal to the criterion or more. The third is that a recurrence interval of thermostat-off is calculated, and the correction is performed when the interval is equal to the criterion or less. The forth is that the recurrence interval of the thermostat off is calculated, and a correction amount is changed according to the interval. Thus energy-saving effect can be achieved in accompany with the improvement of comfort. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to an air conditioner having a variable compressor operating frequency.

Conventionally, in this type of air conditioner, the compressor operating frequency has been changed by comparing the room temperature set by the remote control device with the air intake thermistor detected temperature of the air conditioner. However, at that time, in order to suppress an increase in the temperature of the blown air from the indoor unit, a specific lower limit value is set in accordance with the rotational speed of the indoor fan (for example, see Patent Document 1).
JP-A-8-178400

  However, in the above-described conventional configuration, the frequency cannot be lowered below a certain value due to the lower limit value of the frequency, and after the room is sufficiently cooled down and reaches the temperature set by the remote control device, the capacity becomes excessive. turn into. For this reason, thermostat-off frequently occurred, and comfort was deteriorated due to an increase in room temperature and an increase in humidity due to re-evaporation of condensed water.

  In order to solve the conventional problem, the air conditioner of the present invention can correct the lower limit frequency after the detected temperature of the indoor suction thermistor reaches the temperature set by the remote control device.

  According to the present invention, thermostat-off in a light load environment is suppressed and comfort is improved, and energy is saved by lowering the operating frequency.

  According to a first aspect of the present invention, when the detected temperature of the indoor thermistor reaches the temperature set by the remote control device and the thermostat is off, the lower limit value of the operating frequency is corrected by a predetermined amount so that the air conditioner is stabilized after the room temperature is stabilized. It is possible to improve the comfort by suppressing the occurrence of the thermostat and suppressing the occurrence of the thermostat.

  According to a second aspect of the present invention, when the temperature detected by the indoor suction thermistor reaches a temperature set by the remote control device and the thermostat is turned off, the number of times the thermostat is turned off is stored. By correcting the above, the lower limit frequency of the compressor can be adjusted according to the change in the load of the room, the ability of the air conditioner can be suppressed after the room temperature is stabilized, and the occurrence of thermostat off can be suppressed and the comfort can be improved. .

  According to a third aspect of the present invention, when the temperature detected by the indoor suction thermistor reaches the temperature set by the remote control device and the thermostat is turned off, the number of times the thermostat is turned off is stored, and the thermostat turned off within a predetermined time. If the number of times is greater than a certain standard, the lower limit frequency can be adjusted to adjust the lower limit frequency of the compressor according to changes in the load on the room. Occurrence can be suppressed and comfort can be improved.

According to a fourth aspect of the present invention, when the detected temperature of the indoor suction thermistor reaches a temperature set by the remote control device and a thermostat off occurs, the interval between the thermostat off and the previous thermostat off is calculated, and the time is calculated in advance. If it is longer than the set time, the lower limit value of the operating frequency is corrected by a predetermined amount, so that the lower limit frequency of the compressor can be adjusted according to the load change of the room, and the capacity of the air conditioner can be adjusted after the room temperature is stabilized. It is possible to improve the comfort by suppressing the occurrence of the suppression thermostat off.

  The fifth invention calculates the interval between the thermostat off and the previous thermostat off when the detected temperature of the indoor thermistor reaches the temperature set by the remote control device and a thermostat off occurs, and according to the time By changing the correction amount of the lower limit frequency of the operation frequency, the lower limit frequency of the compressor can be adjusted according to the load change of the room, and after the room temperature stabilizes, the capacity of the air conditioner is suppressed and the occurrence of thermostat off is suppressed Comfort can be improved.

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

(Embodiment 1)
As shown in the flowchart of FIG. 1, at the start of operation, F1 shown in step 1 is the operation lower limit frequency of the compressor. At that time, if the detected temperature of the indoor thermistor approaches the temperature set by the remote control device in step 2 and the thermostat is turned off, the process proceeds to step 3 and the operation lower limit frequency F1 of the compressor is set in advance by a predetermined amount. The predetermined amount ΔF1 is corrected to be F2.

(Embodiment 2)
As shown in the flowchart of FIG. 2, at the start of operation, F1 shown in step 4 is the operation lower limit frequency of the compressor. At that time, if the detected temperature of the indoor thermistor approaches the temperature set by the remote control device in step 5 and the thermostat is off, the process proceeds to step 6.

  In step 6, the number of occurrences of thermostat-off is stored. When the stored number reaches the preset number N1, it is determined that the room temperature has stabilized, and the process proceeds to step 7. In step 7, the operation lower limit frequency F1 of the compressor is corrected by a predetermined amount ΔF2 to be F3.

  Thereafter, the process proceeds to step 8, and the number of occurrences of thermostat-off is continuously stored. When the stored number reaches the preset number N2, it is determined that the room temperature is sufficiently stable and the capacity of the air conditioner is excessive. Proceed to step 9. In step 9, the operation lower limit frequency F3 of the current compressor is further corrected by ΔF2 to be F4.

(Embodiment 3)
As shown in the flowchart of FIG. 3, at the start of operation, F1 shown in step 10 is the operation lower limit frequency of the compressor. At that time, if the detected temperature of the indoor suction thermistor approaches the temperature set by the remote control device in step 11 and the thermostat is off, the process proceeds to step 12.

  In step 12, the number of occurrences of thermostat-off is memorized while measuring the time, and when the thermostat-off occurs for a predetermined number of times N3 or more within a predetermined time T1, the room temperature is stabilized and the capacity of the air conditioner is reduced. It is determined that the number is excessive, and the process proceeds to Step 13. If N3 or less, measurement of the number of occurrences of thermostat off is continued.

  In step 13, the operation lower limit frequency F1 of the compressor is corrected by a predetermined amount ΔF3 set to F5. Thereafter, the process proceeds to step 14 and the measurement of the number of thermostat off occurrences is continued. Therefore, when the thermostat-off has occurred a predetermined number of times N3 or more within the predetermined time T1 set in advance again, the routine proceeds to step 15.

  In step 15, the current operation lower limit frequency F5 of the compressor is further corrected by a predetermined amount ΔF3 to be F6. Thereafter, this step is repeated, and the correction is repeated until the thermostat-off frequency reaches a predetermined number N3 or less within a predetermined time T1. Thereby, the driving | operation with an optimal lower limit frequency is attained.

(Embodiment 4)
As shown in the flowchart of FIG. 4, at the start of operation, F1 shown in step 16 is the operation lower limit frequency of the compressor. At that time, if the detected temperature of the indoor suction thermistor approaches the temperature set by the remote control device in step 17 and the thermostat is off, the process proceeds to step 18.

  In step 18, the time from the previous thermostat off to the current thermostat off is calculated, and if the result is less than the preset time T2, the room temperature is stable and the air conditioner capacity is excessive. Determine and proceed to step 19. If it is equal to or greater than T2, the process stays at step 18 as it is, and the time is compared for each thermostat off.

  In step 19, the operation lower limit frequency F1 of the compressor is corrected by a predetermined amount ΔF4 and set to F7. Thereafter, the process proceeds to step 20, and the comparison with T2 is performed in the same manner as in step 18 when the thermostat is off. Therefore, when the thermostat-off interval is again less than T2, it is determined that the capacity of the air conditioner is still excessive, and the routine proceeds to step 21.

  In step 21, the operation lower limit frequency F7 of the current compressor is corrected by a predetermined amount ΔF4 and set to F8. Thereafter, this step is repeated, and correction is repeated until the thermostat-off interval becomes equal to or greater than T2. Thereby, the driving | operation with an optimal lower limit frequency is attained.

(Embodiment 5)
As shown in the flowchart of FIG. 5, at the start of operation, F1 shown in step 22 is the operation lower limit frequency of the compressor. At that time, if the detected temperature of the indoor suction thermistor approaches the temperature set by the remote control device in step 23 and the thermostat is off, the process proceeds to step 24.

  In step 24, the time from the previous thermostat off to the current thermostat off is calculated, and if the result is equal to or longer than the preset time T3, the thermostat off interval is continuously measured without correction. To do. On the other hand, if it is less than T3, the routine proceeds to step 25. In step 25, the thermostat-off interval is compared with T4, and if it is equal to or greater than T4, the process proceeds to step 26, and if it is less than T4, the process proceeds to step 27.

  In step 26, the operation lower limit frequency F1 of the compressor is corrected by a predetermined amount ΔF5 and set to F9. In step 27, the thermostat-off interval is compared with T5, and if it is equal to or greater than T5, the process proceeds to step 28, and if it is less than T5, the process proceeds to step 29.

In step 28, the operation lower limit frequency F1 of the compressor is corrected by a predetermined amount ΔF6 to be F10. In step 29, the operation lower limit frequency F1 of the compressor is corrected by a predetermined amount ΔF7 to be F11. After step 26, step 28, and step 29, the process returns to step 24, and when the next thermostat is off, the correction amount is changed according to the interval by the above procedure. Thereby, the driving | operation with an optimal lower limit frequency is attained.

  As described above, since the air conditioner according to the present invention improves the comfort of the living space and leads to energy saving, the air conditioner includes the indoor and outdoor heat exchangers, the indoor heat exchanger temperature sensor, and the indoor and outdoor fans. Applicable to equipment.

Flowchart in Embodiment 1 of the present invention Flowchart in Embodiment 2 of the present invention Flowchart in Embodiment 3 of the present invention Flowchart in Embodiment 4 of the present invention Flowchart in the fifth embodiment of the present invention

Explanation of symbols

  1-29 Steps in the flowchart

Claims (5)

An indoor heat exchanger, an indoor fan, an outdoor heat exchanger, an outdoor fan, a compressor, a throttle mechanism, temperature detection means for detecting the temperature of the indoor heat exchanger, the indoor air temperature, and the outdoor air temperature, and the operating frequency of the compressor In an air conditioner that is variable, an air conditioner that can correct the lower limit frequency when the room temperature reaches the room temperature set by the remote control device during a cooling or dehumidifying operation and a thermostat off occurs . An indoor heat exchanger, an indoor fan, an outdoor heat exchanger, an outdoor fan, a compressor, a throttle mechanism, temperature detection means for detecting the temperature of the indoor heat exchanger, the indoor air temperature, and the outdoor air temperature, and the operating frequency of the compressor In the air conditioner that is variable, the lower limit frequency can be corrected when the room temperature is stable and the thermostat is off during cooling and dehumidifying operations. Accordingly, an air conditioner capable of correcting the lower limit frequency. An indoor heat exchanger, an indoor fan, an outdoor heat exchanger, an outdoor fan, a compressor, a throttle mechanism, temperature detection means for detecting the temperature of the indoor heat exchanger, the indoor air temperature, and the outdoor air temperature, and the operating frequency of the compressor In an air conditioner that is variable, an air conditioner that can correct the lower limit frequency when the room temperature reaches the room temperature set by the remote control device during a cooling or dehumidifying operation and a thermostat off occurs Among them, an air conditioner that can correct the lower limit frequency according to the frequency of occurrence of thermostat off. An indoor heat exchanger, an indoor fan, an outdoor heat exchanger, an outdoor fan, a compressor, a throttle mechanism, temperature detection means for detecting the temperature of the indoor heat exchanger, the indoor air temperature, and the outdoor air temperature, and the operating frequency of the compressor In an air conditioner that is variable, an air conditioner that can correct the lower limit frequency when the room temperature reaches the room temperature set by the remote control device during a cooling or dehumidifying operation and a thermostat off occurs Among them, an air conditioner that can correct the lower limit frequency according to the interval between the previous thermostat off and the current thermostat off. An indoor heat exchanger, an indoor fan, an outdoor heat exchanger, an outdoor fan, a compressor, a throttle mechanism, temperature detection means for detecting the temperature of the indoor heat exchanger, the indoor air temperature, and the outdoor air temperature, and the operating frequency of the compressor The air conditioner that can change the lower limit frequency when the room temperature reaches the room temperature set by the remote control device during the cooling and dehumidifying operation and the thermostat is turned off. An air conditioner that can change the correction amount of the lower limit frequency according to the interval between the previous thermostat off and the current thermostat off.

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