JP2011247531A - Air conditioner - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an air conditioner that detects the presence or absence of a gap in characteristics between pressure detectors.SOLUTION: The air conditioner includes an outdoor unit provided with: a compressor; a discharge pressure detector for detecting the pressure of a refrigerant discharged from the compressor; and a suction pressure detector for detecting the pressure of a refrigerant sucked into the compressor. The air conditioner has an outdoor unit controller for controlling the outdoor unit. The air conditioner is configured such that, when the air conditioner is not in operation, the detected values by the discharge pressure detector and the suction pressure detector are compared to observe a difference, and if the difference in the values reaches the predetermined value or above, the differential pressure between the discharge pressure detected by the discharge pressure and the suction pressure detected by the suction pressure detector is shown on a display arranged on the outdoor unit controller.

Description

  The present invention relates to an air conditioner equipped with pressure detection means, and more particularly to control for determining a decrease in detection accuracy of pressure detection means.

  Conventionally, in this type of air conditioner, performance control such as low-pressure constant pressure control in cooling operation and high-pressure constant frequency control in heating operation is performed (for example, see Patent Document 1).

  In the cooling operation, the low-pressure pressure constant frequency control is performed using the low-pressure pressure detecting means arranged in the suction pipe for detecting the suction pressure to the compressor. In the heating operation, the discharge pipe for detecting the discharge pressure from the compressor is used. High frequency pressure constant frequency control is performed using the arranged high pressure detection means.

JP-A-3-241260

  However, since the conventional configuration determines the operating frequency of the compressor, which is an important determinant of the air-conditioning capacity in the air conditioner, based on the detection value of the pressure detection means, the characteristics of the pressure detection means are shifted. There was a problem that the effect of the occurrence of the problem was great and the comfort was impaired.

  The present invention solves the above-described conventional problems, and an object of the present invention is to provide an air conditioner that can detect the presence or absence of a characteristic deviation of a pressure detection means.

  In order to solve the above-described problems, the present invention includes a compressor, a discharge pressure detection unit that detects a refrigerant pressure discharged from the compressor, and a suction pressure detection unit that detects a refrigerant pressure sucked into the compressor. An air conditioner having an outdoor unit having an outdoor unit control device for controlling the outdoor unit, and comparing the values detected by the discharge pressure detecting means and the suction pressure detecting means when the air conditioner is stopped. When the difference between the values is detected to be greater than or equal to a predetermined value, the differential pressure between the discharge pressure detected by the discharge pressure detection means and the suction pressure detected by the suction pressure detection means is displayed on the outdoor unit control device. By displaying on the arranged indicator, it can be confirmed that the deviation of the detected value is large.

  As described above, the air conditioning apparatus of the present invention can detect the presence or absence of a characteristic deviation of the pressure detection means.

Refrigeration cycle diagram of the air-conditioning apparatus according to Embodiment 1 of the present invention The flowchart figure of the air conditioning apparatus in Embodiment 1

An air conditioner according to a first aspect of the present invention includes an outdoor unit including a compressor, a discharge pressure detection unit that detects a refrigerant pressure discharged from the compressor, and a suction pressure detection unit that detects a refrigerant pressure sucked into the compressor. An air conditioner having an air conditioner, having an outdoor unit control device that controls the outdoor unit, and comparing the values detected by the discharge pressure detecting means and the suction pressure detecting means when the operation of the air conditioner is stopped, When the difference between the values is detected to be equal to or greater than a predetermined value, the differential pressure between the discharge pressure detected by the discharge pressure detection means and the suction pressure detected by the suction pressure detection means is arranged on the outdoor unit control device. By displaying on the indicator, it can be confirmed that the deviation of the detected value is large.

  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 is a refrigeration cycle diagram of the air conditioner of the present invention. As shown in FIG. 1, the air-conditioning apparatus according to the present embodiment includes a compressor 1 that compresses a refrigerant, an outdoor heat exchanger 3 that exchanges heat between the refrigerant and air, and air blown to the outdoor heat exchanger 3. The outdoor blower 4 to be performed, the outdoor electric expansion valve 5, the four-way valve 6 for switching the refrigerant flow path, the discharge pressure detecting means 2 for detecting the discharge pressure from the compressor 1, and the suction pressure sucked into the compressor 1 are detected. A suction pressure detecting means 8 that detects the outside air temperature;

  The indoor heat exchanger 12 that exchanges heat between the indoor air and the refrigerant, the indoor blower 13 that blows air to the indoor heat exchanger 12, the indoor electric expansion valve 14, and the indoor unit control that controls the equipment in the indoor unit 16 Device 15. In the present embodiment, the indoor unit 16 constitutes one of multi-type indoor units in which a plurality of indoor units are connected in parallel.

  FIG. 2 is a flowchart of the air conditioner of the present invention.

  In this air conditioner, it is determined whether or not the operation is stopped and the change in the outside air temperature T0 detected by the outside air temperature detecting means 9 is within the predetermined value S for a predetermined time N or more. To do.

  Then, when it is within the predetermined value S for a predetermined time N or more, the value Pd (MPa) detected by the discharge pressure detecting means 2 and the value Ps (MPa) detected by the suction pressure detecting means 8 When the differential pressure exceeds a predetermined value ΔP, the differential pressure is displayed on a display (for example, 7 segments) arranged on the outdoor unit control device 10.

  As a result, the operation is not continued for a long time in a state where an abnormal deviation occurs in the pressure detecting means, that is, the abnormality can be detected at an early stage, and the comfort can be guaranteed.

  The air conditioner of the present invention is not limited to a single-system multi-room air conditioner, and can also be applied to an outdoor multi-type air conditioner in which a plurality of systems of outdoor units are connected.

DESCRIPTION OF SYMBOLS 1 Compressor 2 Discharge pressure detection means 3 Outdoor heat exchanger 4 Outdoor blower 5 Outdoor electric expansion valve 6 Four-way valve 8 Suction pressure detection means 9 Outdoor temperature detection means 10 Outdoor unit control apparatus 11 Outdoor unit 12 Indoor heat exchanger 13 Indoor blower 14 indoor electric expansion valve 15 indoor unit control device 16 indoor unit

Claims (1)

An air conditioner having an outdoor unit comprising a compressor, a discharge pressure detecting means for detecting a refrigerant pressure discharged from the compressor, and a suction pressure detecting means for detecting a refrigerant pressure sucked into the compressor. An outdoor unit control device that controls the outdoor unit, and compares the values detected by the discharge pressure detection unit and the suction pressure detection unit when the operation of the air conditioner is stopped. When the difference is detected above a predetermined value, the differential pressure between the discharge pressure detected by the discharge pressure detection means and the suction pressure detected by the suction pressure detection means is arranged on the outdoor unit control device. An air conditioner that displays on a display.

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