JPH03213937A - Controller of air-conditioner - Google Patents

Abstract

PURPOSE:To improve an integrated heating capacity in a low-temperature operation by increasing the speed of indoor and outdoor fans to be higher than that in an ordinary heating operation and by raising a refrigerant discharge temperature by a discharge temperature switching means, when an outside-air temperature is a set temperature or below. CONSTITUTION:When an instruction on a heating operation is given by a remote-controller or an operating panel, an outdoor fan 10, an indoor fan 11 and a compressor start to operate. Then an outside-air temperature sampled by a detecting means 1 and the outside-air temperature set beforehand by a setting means 2 are compared with each other by a comparing means 3, and when the outside-air temperature is lower than a set value, the speed of the outdoor fan 10 and that of the indoor fan 11 are increased respectively through fan speed switching means 4 and 5 and driving means 7 and 8. At the same time, an expansion valve 12 is switched over onto the low opening side through a switching means 6 and a driving means 9 and a discharge temperature is also raised. In this way, an integrated heating capacity in a low-temperature operation can be improved.

Description

Detailed Description of the Invention (Field of Industrial Application) The present invention distinguishes between normal heating operation of an air conditioner and heating operation when the outside temperature is particularly low (hereinafter referred to as low-temperature operation). The present invention relates to a control device for an air conditioner that performs good control.

(Conventional technology) In conventional air conditioners, the rotational speed of indoor and outdoor fans during heating operation (from one defrosting operation to the next defrosting operation), the temperature of the refrigerant discharged by the compressor (hereinafter referred to as discharge temperature) ) was always controlled with the same control content regardless of the outside temperature.

(Problems to be Solved by the Invention) As described above, in the conventional control, the discharge temperature during low temperature operation is the same low temperature as during normal heating operation.

Even when the load in the room increases, such as during low-temperature operation, the heating capacity of the air conditioner cannot cope with the load.

In other words, there was a tendency for the integrated capacity, which represents the performance of one cycle from the start of low-temperature operation to the end of defrosting operation, in unit time, to decrease significantly.

The present invention has been made to solve the above problems, and an object of the present invention is to provide a control device that performs load-based control only when the outside air temperature during heating operation is below a certain specified temperature.

(Means for Solving the Problems) In order to solve the above problems, the present invention provides an outside air temperature detection means and a comparison means for comparing the detected temperature with a preset outside air temperature setting value and outputting the result. and an outdoor fan speed switching means for switching the outdoor fan speed, an indoor fan speed switching means for switching the indoor fan speed, and a discharge temperature switching means for switching the discharge temperature of the refrigerant discharged by the compressor, based on the output signal of the comparison means. be done.

(Function) With the above configuration, only when the outside air temperature is below a certain specified temperature, the setting of the indoor/outdoor fan speed is increased from that during normal heating operation, and the discharge temperature is switched to be increased.

This makes it possible to suppress frost formation during low-temperature operation, blow out high-temperature air, and improve integration capacity.

(Example) Hereinafter, embodiments will be described in detail with reference to the drawings.

FIG. 1 is a block diagram showing the configuration of an embodiment of the present invention, in which 1 is an outside air temperature detection means, and 3 is a means for comparing the detected temperature with a preset outside air temperature setting value 2. Comparing means for outputting the results; reference numerals 4 and 5.6 denote outdoor fan speed switching means for switching the outdoor fan speed, indoor fan speed switching means for switching the indoor fan speed, and discharge for switching the discharge temperature based on the output signal of the comparing means 3, respectively. Temperature switching means 7, drive means A for driving the outdoor fan 10 according to the control signal of the outdoor fan speed switching means 4; 8, driving means A for driving the indoor fan 11 according to the control signal of the indoor fan speed switching means 5;
The driving means B and 9 are the driving means C which drives the expansion valve 12 based on the control signal of the discharge temperature switching means 6.

Next, the operation of this embodiment will be explained with reference to the flowchart of FIG. When heating operation is instructed using the remote control or operation panel, the indoor/outdoor fan and compressor start operating.

Here, the comparison means 3 compares the outside air temperature T1 sampled by the outside air temperature detection means 1 with the outside air temperature set value Ta set in advance, and determines whether the outside air temperature T1 is lower than the temperature set value Ta. judge.

If the outside air temperature T1 is less than the temperature set value Ta, the outdoor fan speed and the indoor fan speed are increased, and the discharge temperature is also increased. In other cases, normal heating operation is performed. Note that this control operation is repeated.

(Effects of the Invention) As explained above, according to the present invention, when it is determined that the operation is at a low temperature depending on the state of the outside air temperature, the outdoor heat exchanger is By increasing the speed of the indoor fan, the heat exchange efficiency of the indoor heat exchanger is increased, and by increasing the discharge temperature, high-temperature air is blown out, increasing the cumulative heating capacity during low-temperature operation. can be done.

[Brief explanation of drawings]

FIG. 1 is a block diagram of an embodiment of the present invention, and FIG. 2 is a block diagram of an embodiment of the present invention.
It is a flowchart of the same example. 1... Outside air temperature detection means, 2... Outside air temperature setting value, 3... Comparison means, 4... Outdoor fan speed switching means, 5... Indoor fan speed switching means, 6
...Discharge temperature switching means, 7...Drive means A, 8
... Drive means B, 9 ... Drive means C110.
...Outdoor fan, 11...Indoor fan, 12...Expansion valve.

Claims (1)

[Claims] an outside air temperature detection means; a comparison means for comparing the detected temperature with a preset outside air temperature setting value and outputting the result; and an outdoor fan speed switching means for switching the outdoor fan speed based on an output signal of the comparison means; It consists of an indoor fan speed switching means for switching the indoor fan speed and a discharge temperature switching means for switching the discharge temperature of the refrigerant discharged by the compressor, and when the outside air temperature is below the set temperature, the indoor and outdoor fan speeds can be changed during normal heating operation. A control device for an air conditioner characterized by increasing the discharge temperature.