JP2006145111A - Dehumidifying operation control method for air conditioner - Google Patents

Abstract

In an air conditioner having a dehumidifying operation mode for dehumidifying indoors, a dehumidifying operation that prevents a decrease in reliability due to a pull-down of the cooling capacity when shifting from a cooling operation to a dehumidifying operation mode and improves the comfort of a resident Provide control.
During a dehumidifying operation, the difference between the remote controller set temperature Ts and the room temperature T is calculated, and the rotational speed of the compressor, the rotational speed of the indoor air blower, and the valve opening of the electronic expansion valve are stepwise for each difference. It is characterized by being controlled, and it is possible to prevent a drop in reliability due to pull-down of the cooling capacity at the time of shifting from the cooling operation to the dehumidifying operation mode, and it is possible to increase the comfort of the resident.
[Selection] Figure 1

Description

  The present invention relates to an air conditioner having a dehumidifying operation mode for dehumidifying indoors, and more particularly to a dehumidifying operation control method when shifting from a cooling operation to a dehumidifying operation.

  There are generally three types of current air conditioner dehumidifying operations: weak cooling, heater overheating, and refrigerating cycle reheating. The outline of each method is as follows. First, the weak cooling type is able to secure the latent heat capacity and obtain the dehumidifying effect by adjusting the compressor rotation speed, the indoor air volume, and the expansion degree of the expansion valve when the room temperature is stable. Since the indoor air volume is reduced and the cooling capacity is suppressed, dehumidification can be performed without reducing the room temperature. In the heater overheating type, the room air cooled and dehumidified by means such as an electric heater during the cooling operation can be dehumidified without reheating the room temperature. The refrigeration cycle reheat type divides the indoor heat exchanger into two parts and interposes an expansion valve between the two heat exchangers, so that one heat exchanger is an evaporator and the other heat exchanger is an outdoor heat exchange. Like the condenser, it functions as a condenser, and since the air cooled and dehumidified on the evaporator side is warmed on the condenser side, it can be dehumidified without lowering the room temperature.

  As described above, in the dehumidifying operation, various devices have been made to obtain a dehumidifying action, and in recent years, the heater overheating type and the refrigerating cycle reheating type are increasing, but these methods are electric heaters and expansions. The addition of valves is necessary and costly, and the reliability design of the heater and the refrigeration cycle is complicated. Therefore, even today, a weak cooling type dehumidifying operation that can be easily performed is widely used.

As a weak cooling type dehumidifying operation control method, first, the cooling operation is performed at the time of start-up, and when the room temperature reaches the set temperature, the dehumidifying operation mode is entered. The dehumidifying action is obtained by adjusting the latent heat and the sensible heat capacity by controlling the degree or the like (for example, see Patent Document 1).
JP 2001-21196 A

  However, in the conventional configuration, when changing from the cooling operation to the dehumidifying operation mode, particularly in a class having a large capacity rank, the evaporation pressure is drastically decreased in order to immediately change the indoor air volume to be used and the opening degree of the expansion valve. As a result, the heat exchanger freezes and condensation in the air passage due to a drop in the blowout air occurs, and the blowout air winds down at a stretch, thereby deteriorating the comfort to the residents.

  The present invention solves the above-described conventional problems, and provides a dehumidifying operation control method for an air conditioner that can prevent a decrease in reliability due to a pull-down of the cooling capacity when shifting from a cooling operation to a dehumidifying operation mode, and can ensure comfort. The purpose is to do.

  In order to solve the above-described conventional problems, an air conditioner dehumidifying operation control method according to the present invention is an air conditioner having a weak cooling type dehumidifying function. The difference is calculated, and the rotation speed of the compressor, the rotation speed of the indoor blower, and the valve opening degree of the electronic expansion valve are controlled stepwise for each difference.

By using the above-mentioned means, it is possible to prevent a decrease in reliability due to a pull-down of the cooling capacity at the time of transition from the cooling operation to the dehumidifying operation mode, and it is possible to increase the comfort of the resident.

  Furthermore, the dehumidifying operation control method for an air conditioner according to the present invention is characterized in that a maximum value and a minimum value are set for the compressor rotation speed, the rotation speed of the indoor blower, and the valve opening of the electronic expansion valve. It is.

  By using the above means, reliability and comfort can be further improved.

  Further, the dehumidifying operation control method for an air conditioner according to the present invention has means for selecting a plurality of dehumidifying modes in the remote controller, and for each mode, the number of rotations of the compressor, the number of rotations of the indoor blower, and the opening of the electronic expansion valve. The degree is controlled in steps.

  By using the above means, it is possible to provide a dehumidifying operation suitable for the user's intention while maintaining reliability and comfort.

  The dehumidifying operation control method for an air conditioner according to the present invention can prevent a decrease in reliability due to a pull-down of the cooling capacity during the transition from the cooling operation to the dehumidifying operation mode, and can improve the comfort of the resident.

  1st invention WHEREIN: The calculation part which calculates the difference of the preset temperature from a remote control and the said indoor temperature sensor at the time of a dehumidification driving | operation, The rotation speed of the said compressor by the output value from the said calculation part, rotation of the said indoor air blower By providing control value determination output means for controlling the number and the opening degree of the electronic expansion valve stepwise, the control can be smoothly transferred without causing a pull-down of the cooling capacity when the cooling operation is shifted to the dehumidifying operation mode. Therefore, a decrease in reliability can be prevented and the comfort of the occupant can be increased.

  According to the second to fourth aspects of the present invention, the maximum variation and the minimum value are set in the rotation speed of the compressor, the rotation speed of the indoor air blower, and the valve opening of the electronic expansion valve, thereby minimizing the fluctuation range. Since it can be controlled, it can sufficiently cope with fluctuations in capability rank and air conditioning load, and can further improve reliability and comfort.

  According to a fifth aspect of the present invention, the remote controller includes a unit for selecting a plurality of dehumidifying modes, and includes a dehumidifying mode reading output unit that reads and outputs a signal from the remote controller, and each mode is determined by a signal from the dehumidifying mode reading output unit. By controlling the rotational speed of the compressor, the rotational speed of the indoor air blower, and the valve opening of the electronic expansion valve in stages, the reliability and comfort can be maintained while the user can operate the remote controller with a single remote control operation. It is possible to provide a dehumidifying operation capable of adjusting the strength of dehumidifying action according to the intention.

  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)
FIG. 1 shows a block diagram in the dehumidifying operation control of the air conditioners of Embodiments 1 to 3, and FIG. 2 shows a control flowchart.

In FIG. 1, the air conditioner according to the first embodiment includes an input unit 11, a microcomputer 12, and an output unit 13. 1 and 2, first, the operation is started by a remote control operation (S201), and the operation starts from the cooling operation (S202). Then, the system is operated while detecting a signal from the indoor temperature sensor (S203), and is cooled to a temperature set by the remote controller. The calculation unit in the microcomputer 12 calculates a difference (T−Ts) between the room temperature T and the remote controller set temperature Ts based on the signal from the input unit 11, and when the difference becomes 3 ° C. or less (S205). Switch to dehumidifying operation. If the difference exceeds 1 ° C. and is 3 ° C. or less, the table b is selected (S209), the control value for the table b is determined (S217), the compressor speed of the output unit 13, the indoor fan speed, and the expansion valve The valve opening degree is controlled (S218). When the room temperature further approaches the set temperature and the difference between the room temperature T and the set temperature Ts becomes 1 ° C. or less (S207), the table a is selected, and all the values have a smaller value than the values in the table b. A control value for the table a is determined (S217), and the output unit 13 is controlled (S218).

  The values in the table a are set to the compressor speed, the indoor fan speed, and the expansion valve opening required for the original dehumidifying action.

  As described above, in the present embodiment, the compressor speed, the indoor fan speed, and the expansion valve valve opening can be adjusted in two stages until the set temperature is reached, so that the cooling is performed when the cooling operation is shifted to the dehumidifying operation mode. Capability pull-down can be reduced, and control can be transferred smoothly, so that a decrease in reliability can be prevented and the comfort of residents can be improved.

(Embodiment 2)
A second embodiment of the present invention will be described with reference to FIGS. 1 and 2 as in the first embodiment. The same operations as those in the first embodiment are omitted.

  In the control of the present embodiment, when the table a or the table b is selected, the maximum value and the minimum value are set for each table in the control range during the dehumidifying operation (S216), and then the control value is determined (S217). ) Note that the value of the table b is set smaller than the table a, and the values of the table a are the maximum and minimum values of the compressor speed, the indoor fan speed, and the expansion valve opening required for the original dehumidifying action. Set to a value.

  As described above, in the present embodiment, the minimum fluctuation range is set by setting the maximum value and the minimum value in the rotation speed of the compressor, the rotation speed of the indoor fan, and the valve opening degree of the electronic expansion valve. Therefore, it is possible to sufficiently cope with fluctuations in the capability rank and the air conditioning load, and it is possible to improve reliability and comfort.

(Embodiment 3)
A third embodiment of the present invention will be described with reference to FIGS. 1 and 2 as in the first and second embodiments. The same operation as in the first and second embodiments is omitted.

  In the control according to the present embodiment, the user selects and transmits one of a plurality of dehumidification modes with a remote controller for those equipped with a plurality of dehumidification modes (S201). The dehumidifying mode reading output means in the microcomputer 12 detects the dehumidifying mode from the remote controller (S203), and selects either the dehumidifying mode A or the dehumidifying mode B (S204, S210). And the table for every dehumidification mode is selected (S208, S209, S214, S215), and each maximum value, minimum value, and the control value of the output part 13 are determined optimally.

  As described above, in the present embodiment, the remote control has means for selecting a plurality of dehumidification modes, provided with a dehumidification mode read output means for reading and outputting a signal from the remote control, and by a signal from the dehumidification mode read output means By controlling the number of revolutions of the compressor, the number of revolutions of the indoor air blower, and the opening of the electronic expansion valve step by step for each mode, one remote control operation is performed while maintaining reliability and comfort. Thus, it is possible to provide a dehumidifying operation capable of adjusting the strength of the dehumidifying action in accordance with the user's intention.

  As described above, the dehumidifying operation control method for an air conditioner according to the present invention prevents a decrease in reliability due to a pull-down of the cooling capacity during the transition from the cooling operation to the dehumidifying operation mode, and improves the comfort of the occupant. Therefore, it can be applied to uses such as an air conditioner having a dehumidifying operation mode for dehumidifying indoors.

The block diagram which shows the dehumidification driving | operation control method of the air conditioner in Embodiment 1-3 of this invention The flowchart which shows operation | movement of the dehumidification driving | operation control method of the air conditioner in Embodiment 1-3 of this invention.

Explanation of symbols

11 Input section 12 Microcomputer 13 Output section Ts Remote control temperature T Indoor temperature

Claims (5)

A compressor capable of changing the rotational speed, an indoor temperature sensor, an indoor heat exchanger, an indoor air blower capable of changing the rotational speed, an indoor unit composed of an indoor wind direction device, an outdoor unit composed of an outdoor heat exchanger and an outdoor air blower, In an air conditioner that constitutes a refrigeration cycle with an electronic expansion valve, during a dehumidifying operation, a calculation unit that calculates a difference between a set temperature from a remote controller and the indoor temperature sensor, and an output value from the calculation unit A dehumidifying operation control method for an air conditioner, comprising control value decision output means for controlling the rotational speed, the rotational speed of the indoor blower, and the valve opening of the electronic expansion valve in a stepwise manner. The dehumidifying operation control method for an air conditioner according to claim 1, wherein a maximum value and a minimum value are set in a control range of the rotation speed of the compressor. The dehumidifying operation control method for an air conditioner according to claim 1 or 2, wherein a maximum value and a minimum value are set in a control range of the number of revolutions of the indoor blower. The dehumidifying operation control method for an air conditioner according to any one of claims 1 to 3, wherein a maximum value and a minimum value are set in a control range of the valve opening degree of the electronic expansion valve. The remote controller has means for selecting a plurality of dehumidifying modes, and is provided with a dehumidifying mode reading output means for reading and outputting a signal from the remote controller, and the rotation of the compressor for each mode is determined by a signal from the dehumidifying mode reading output means. The dehumidifying operation control method for an air conditioner according to any one of claims 1 to 4, wherein the number, the rotational speed of the indoor air blower, and the valve opening of the electronic expansion valve are controlled stepwise. .

Images