JP4830632B2 - Air conditioner - Google Patents

Description

The present invention is an air conditioner that controls the rotational speed of a blower fan in accordance with the outside air temperature in order to improve the start-up performance during heating operation.

  Conventionally, in this type of air conditioner, at the start of cooling operation or heating operation, an upper limit value or a lower limit value of the initial operation frequency of the compressor is set according to the outside air temperature so that the cooling capacity and the heating capacity are not insufficient. There was a thing characterized by this (for example, refer patent document 1).

  In addition, as a measure to improve the start-up performance during heating operation and to improve the feeling of foot heating during heating operation, reduce the air volume by reducing the blowout area of the outlet of the indoor unit, and at the same time reduce the operating frequency of the compressor Increasing the condensation temperature to raise the blown air temperature, and controlling the air volume based on the blown air temperature and the radiation temperature (see, for example, Patent Document 2).

  FIG. 4 is a diagram illustrating correction characteristics of the initial frequency, the upper limit frequency, and the lower limit frequency with respect to the outside air temperature during the heating operation of the conventional air conditioner described in Patent Document 1. As shown in FIG. 4, the required heating capacity becomes smaller as the outside air temperature becomes higher than the reference outside air temperature, so that the initial frequency, the upper limit frequency, and the lower limit frequency are gradually set lower.

  Furthermore, as conventional control, the temperature of the indoor heat exchanger is detected, and the number of rotations of the blower fan of the indoor unit is changed stepwise for each threshold according to the increase in the indoor heat exchanger temperature. I try to alleviate the cold wind.

FIG. 5 is a diagram showing the correlation between the indoor heat exchanger temperature during the heating operation of the conventional air conditioner and the rotational speed of the blower fan of the indoor unit. As shown in FIG. 5, as the indoor heat exchanger temperature rises, the rotation speed of the blower fan of the indoor unit is stepped with the rotation speed 1, rotation speed 2, rotation speed 3 for each threshold of the indoor heat exchanger temperature. Has been changed.
JP-A-8-219530 JP-A-9-296953

  However, the conventional configuration has the following problems. That is, at the start of operation, the frequency can be set according to the required capacity, but when the outside air temperature is low, there is a current limit value that can be operated, so the frequency may not rise, and as a result the room temperature is somewhat There was a case where the absolute heating capacity was insufficient until it rose.

  On the other hand, the method of changing the rotation speed of the blower fan of the indoor unit in a stepwise manner for each threshold according to the rise in the indoor heat exchanger temperature has the following problems. That is, when the temperature of the indoor heat exchanger is low and the rotational speed of the blower fan is low, the wind does not reach the lower part of the room and the feeling of foot heating may be impaired.

  In addition, when the outdoor temperature is low, such as on a snowy day, the evaporation temperature decreases due to the rapid frost formation on the outdoor heat exchanger as the heating operation starts. The chamber temperature may begin to decrease without increasing to the temperature range where the rotation speed of the set blower fan is reached. For this reason, the absolute heating capacity is insufficient with the rotation speed of the blower fan being low, the temperature of the entire room does not rise easily, and the startup performance during heating tends to be poor. In this case, the rotation speed of the blower fan is low and the temperature of the blown air is low, so not only a feeling of heating is not obtained, but the temperature rise in the room becomes extremely bad, and defrosting is performed before reaching the set room temperature. In rare cases, the operation started and a vicious cycle occurred in which the rise in room temperature became slower.

  In addition, when the rotational speed of the blower fan specified in a step shape is simply increased, if the rotational speed of the blower fan increases beyond a certain threshold value, the air flow difference is large due to the change in the step shape. There was a possibility that the temperature of the heat exchanger was extremely lowered, and the rotational speed of the blower fan was lowered again.

  The present invention solves the above-mentioned conventional problems, and in order to improve the start-up performance during heating operation, when the outside air temperature detected by the outside air temperature detecting means is equal to or less than a predetermined value, only between certain threshold values. An object of the present invention is to provide an air conditioner characterized in that the rotational speed of the blower fan is increased stepwise and finally adjusted to the rotational speed defined by the threshold value.

In order to solve the conventional problems, an air conditioner according to the present invention includes an indoor heat exchanger, a blower fan, a wind direction changing unit that changes a wind direction of blown air attached to an air outlet, and the indoor heat. An air conditioner comprising an indoor unit having an indoor heat exchanger temperature detecting means for detecting the temperature of an exchanger and an outside air temperature detecting means for detecting an outside air temperature, the air blower based on the indoor heat exchanger temperature When the rotational speed of the fan is changed in steps, and the outside air temperature is equal to or lower than a predetermined value, if the temperature of the indoor heat exchanger is between the threshold values of the indoor heat exchanger temperature that determines each step, the air flow When the rotation speed of the fan is constant and the temperature of the indoor heat exchanger exceeds a threshold value, the rotation speed of the blower fan is increased or decreased, and the temperature of the indoor heat exchanger is between a certain threshold value Is the blower fan Depending the number of revolutions to the time stepwise increase or decrease, step immediately before the transition the A between certain threshold, when increasing the rotation speed of the blower fan, the rotational speed of the blower fan set in the remote control Between the thresholds of the indoor heat exchanger for determining the step immediately after shifting from the rotational speed of the blower fan set by the remote controller when the rotational speed of the blower fan decreases. It is characterized by this.

  As a result, the rotational speed of the blower fan is increased faster than before, and the rotational speed of the blower fan is prevented from decreasing again, and the absolute shortage of heating capacity can be improved. Can be improved compared to the prior art, and the startup performance during heating can be improved, so that a more comfortable indoor environment can be provided.

  The air conditioner of the present invention can improve the absolute shortage of heating capacity even when the outside air temperature is low, such as on a snowy day, and at the same time, the temperature rise of the entire room is improved compared to the conventional one, and the startup performance during heating is improved. Therefore, a more comfortable indoor environment can be provided.

1st invention is an indoor heat exchanger which detects the temperature of the indoor heat exchanger, the ventilation fan, the wind direction change means which changes the wind direction of the blowing air attached to the air blower outlet, and the temperature of the said indoor heat exchanger An air conditioner including an indoor unit having a detection means and an outside air temperature detection means for detecting an outside air temperature, wherein the rotational speed of the blower fan is changed in a step shape based on an indoor heat exchanger temperature. When the outside air temperature is below a predetermined value, if the temperature of the indoor heat exchanger is between the thresholds of the indoor heat exchanger temperature that determines each step, the number of rotations of the blower fan is constant and the indoor heat exchange is performed When the temperature of the cooler exceeds a threshold value, the rotational speed of the blower fan is increased or decreased. When the temperature of the indoor heat exchanger is between a certain threshold value, the rotational speed of the blower fan is set according to time. Incrementally or Small Toe, wherein A between certain threshold, when increasing the rotation speed of the blowing fan, and between the thresholds of the indoor heat exchanger to determine the step of immediately before entering the rotational speed of the blower fan set in the remote control, wherein when the rotation speed of the blower fan is reduced, Ru der those which is a between the threshold of the indoor heat exchanger to determine the steps immediately after transition from the rotational speed of the blower fan set in the remote control.

The second invention is characterized in that, in particular, in the first invention , it is implemented only at the start of operation by the remote controller.

The third invention is characterized in that, in particular, in the first invention , the third invention is implemented only when the difference between the set temperature of the remote controller and the suction temperature of the indoor unit is a predetermined value or more.

  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 refrigeration cycle diagram of an air conditioner according to a first embodiment of the present invention.

  In FIG. 1, during the cooling operation, after the refrigerant is discharged from the compressor 1, the refrigerant passes through the four-way valve 2, condenses in the outdoor heat exchanger 3, is depressurized in the expansion valve 4, and then in the indoor heat exchanger 5. It evaporates, passes through the four-way valve 2 again, and returns to the compressor 1.

  On the other hand, during the heating operation, the refrigerant is discharged from the compressor 1, passes through the four-way valve 2, condenses in the indoor heat exchanger 5, is decompressed by the expansion valve 4, and evaporates in the outdoor heat exchanger 3. It again passes through the four-way valve 2 and returns to the compressor 1.

  FIG. 3 is a diagram showing the correlation between the indoor heat exchanger temperature during the heating operation of the conventional air conditioner and the rotational speed of the blower fan of the indoor unit.

  In FIG. 3, based on the indoor heat exchanger temperature, the rotational speed of the indoor fan is changed in steps. At this time, the threshold value of the indoor heat exchanger temperature that determines each step and the rotation speed of the blower fan are set so as to be a blowout temperature that does not feel cold cold, and is finally set by the remote controller. The lowest rotation speed of the blower fan that can be selected by the remote controller is the previous set rotation speed so that there is no sense of incongruity when the rotation speed of the fan is reached.

  When the maximum number of rotations is set with the remote control because it is desired to warm the room rapidly at the start-up when the outside air temperature is 10 ° C or less, the indoor heat exchanger temperature rises to 39 ° C. If exceeded, the minimum rotational speed of setting 1 will be shifted to the maximum rotational speed. As a result, the air flow difference will cause a sudden decrease in the temperature of the indoor heat exchanger, and the rotational speed of the blower fan will decrease again. The room could not warm up.

  FIG. 2 is a diagram illustrating a correlation between the indoor heat exchanger temperature during the heating operation of the air conditioner and the step of the fan rotation speed of the indoor unit according to the first embodiment of the present invention.

  In FIG. 2, when the outside air temperature is 10 ° C. or lower, an A region is provided between the indoor heat exchanger temperature of 37 ° C. and 39 ° C., and the setting of this region is the number of rotations of the blower fan by 20 rpm / min. Is increased to MAX: set rotational speed. By providing this A region, a sudden change in the indoor air volume can be avoided even in the above case, the maximum number of rotations can be reliably maintained, and the start-up performance in the heating operation can be improved.

  In addition, when the outside air temperature is 10 ° C. or lower, a B region is provided between the temperature of the indoor heat exchanger of 36 ° C. to 33 ° C. The setting of this region reduces the rotational speed of the blower fan by 10 rpm / min. MIN: setting 1.

As a result, frost grows because the outside air temperature is low, and even if the indoor heat exchanger temperature decreases due to insufficient capacity, it can prevent the fan fan from rapidly decreasing and improve startup performance in heating operation Can be made.

  In addition, the conditions set at the outside temperature of 10 ° C or less during heating operation are performed only at the start of operation by the remote controller, so that the room temperature is stabilized near the set temperature and the thermo ON / OFF (run / stop) is repeated. In this state, the rotation speed of the blower can be set to the immediate remote control setting rotation speed, and the room temperature stability can be improved.

  In addition, the condition set at the outside air temperature of 10 ° C or less during heating operation is that the difference between the set temperature of the remote controller and the suction temperature of the indoor unit is performed only at a predetermined value or more, so that the room temperature rises from a low state. Sometimes it is possible to prevent the feeling of cold wind.

  In the present embodiment, the method of controlling by the outside air temperature threshold and the indoor heat exchanger temperature threshold has been described. However, the pressure at which the indoor heat exchanger temperature can be estimated, or the blown air temperature itself may be used as a parameter.

  As described above, the air conditioner according to the present invention can improve the start-up performance during heating by controlling the rotational speed of the blower fan according to the outside air temperature even when the outside air temperature is low during the heating operation. It can also be used for purposes such as vessels.

Refrigeration cycle diagram of the air conditioner in Embodiment 1 of the present invention The figure which shows the correlation with the step of the indoor heat exchanger temperature at the time of the heating operation of the air conditioner in Embodiment 1 of this invention, and the ventilation fan rotation speed of an indoor unit. The figure which shows the correlation with the indoor heat exchanger temperature at the time of the heating operation of the conventional air conditioner, and the rotation speed of the ventilation fan of an indoor unit The figure which shows the correction characteristic of the initial frequency with respect to the external temperature at the time of the heating operation of the conventional air conditioner, an upper limit frequency, and a lower limit frequency The figure which shows the correlation with the indoor heat exchanger temperature at the time of the heating operation of the conventional air conditioner, and the rotation speed of the ventilation fan of an indoor unit

1 Compressor 2 Four-way valve 3 Outdoor heat exchanger 4 Expansion valve 5 Indoor heat exchanger

Claims (3)

An indoor heat exchanger, a blower fan, a wind direction changing means for changing the wind direction of the blown air attached to the air outlet, an indoor heat exchanger temperature detecting means for detecting the temperature of the indoor heat exchanger, and an outside air temperature An air conditioner including an indoor unit having an outside air temperature detecting means for detecting the air temperature, wherein the rotational speed of the blower fan is changed stepwise based on the indoor heat exchanger temperature, and the outside air temperature is a predetermined value. In the following cases, when the temperature of the indoor heat exchanger is between the threshold values of the indoor heat exchanger temperature that determines each step, the rotation speed of the blower fan is constant, and the temperature of the indoor heat exchanger has a threshold value. When it exceeds, the rotational speed of the blower fan is increased or decreased, and when the temperature of the indoor heat exchanger is between a certain threshold, the rotational speed of the blower fan is increased or decreased stepwise according to time. then, the When the rotation speed of the blower fan is increased, it is defined as the interval between the thresholds of the indoor heat exchanger that determines the step immediately before shifting to the rotation speed of the blower fan set by the remote controller. An air conditioner characterized in that when the rotational speed is reduced, it is between the threshold values of the indoor heat exchanger that determines a step immediately after transition from the rotational speed of the blower fan set by the remote controller . An air conditioner that performs the control according to claim 1 only at the start of operation by a remote controller. 2. The air conditioner according to claim 1 , wherein the control according to claim 1 is performed only when a difference between a set temperature of the remote controller and a suction temperature of the indoor unit is a predetermined value or more.

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