JP2003156261A - Control method for air-conditioner - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a control method for an air-conditioner, eliminating the flow sounds of a cooling medium flowing in a capillary tube during cooling and dehumidifying operation after stopping a compressor and preventing unusual sounds resulting from a check valve. SOLUTION: When the compressor 1 is stopped during cooling and dehumidifying operation, the rotating speed of the compressor is changed into the minimum rotating speed. After it becomes the minimum rotating speed, the compressor is stopped and an electronic expansion valve 4 is fully closed. After the passage of a certain time, a solenoid selector valve 9 is opened and after the passage of a certain time the electronic expansion valve is gradually opened with spending time. Thus, the flow sounds of the cooling medium flowing in the capillary tube 6 are eliminated earlier and the unusual sounds resulting from the check valve 7 are prevented.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for controlling an air conditioner, and more particularly to a compressor stop process during a cooling / dehumidifying operation.

[0002]

2. Description of the Related Art As shown in FIG. 1, a compressor 1, a four-way valve 2, an outdoor heat exchanger 3, an electronic expansion valve 4, a first indoor heat exchanger 5, a capillary tube 6 (6a, 6b, 6c). A parallel circuit of a dehumidifying means 8 for dehumidification and a solenoid on-off valve 9, which is a serial parallel circuit with the check valve 7, and a second indoor heat exchanger 10 are sequentially piped to form a refrigeration cycle. When the valve 2 is switched to perform the cooling operation or the heating operation, the electromagnetic opening / closing valve 9 is closed to control the opening degree of the electronic expansion valve 4, and the cooling dehumidification operation or the heating dehumidification operation is performed. There is an air conditioner in which the electronic expansion valve 4 is opened, the electromagnetic opening / closing valve 9 is closed, the dehumidifying decompression means 8 is operated, and the four-way valve 2 is switched. This air conditioner control method, as shown in the flowchart of FIG. 3, switches the four-way valve 2 to the cooling side, opens the electronic expansion valve 4, closes the electromagnetic opening / closing valve 9 to perform the cooling / dehumidifying operation. (ST1 '). At this time, for example, the operation is stopped or the operation mode is switched by operating a remote controller (not shown) provided in the indoor unit of the air conditioner, and the compressor 1
Conventionally, when the stop command is issued (ST2 '), the compressor 1 is stopped immediately (ST3'), and even if the operation start command of the compressor 1 is issued, the pressure of the refrigerant can be balanced for 3 minutes. Mask control is performed so as not to start (ST4 '), and an operation start command is accepted after 3 minutes have passed (ST5').
Was doing. However, after the compressor 1 is stopped, the liquid refrigerant condensed in the outdoor heat exchanger 3 and the first indoor heat exchanger 5 flows to the second indoor heat exchanger 10 side via the dehumidifying decompression means 8. However, at that time, not only an abnormal noise of the liquid refrigerant flowing in the capillary tube 6 is heard, but also after a predetermined time, the liquid refrigerant becomes a foaming state, and the operation of the check valve 7 becomes unstable, so that the check valve There was a problem that abnormal noise was generated from 7. Therefore, although not shown, conventionally, the operation of the check valve 7 was improved, or the dehumidifying decompression means 8 was wrapped with a butyl rubber sheet to prevent abnormal noise from leaking out. It was a problem because the abnormal noise could not be removed.

[0003]

SUMMARY OF THE INVENTION The present invention solves the problems described above, and the noise of the flow of the refrigerant flowing through the capillary tube after the compressor is stopped during the cooling and dehumidifying operation and the abnormal noise from the check valve are eliminated. It is an object of the present invention to provide a control method for an air conditioner that prevents the occurrence of air pollution.

[0004]

In order to solve the above problems, the present invention comprises a compressor, a four-way valve, an outdoor heat exchanger, an electronic expansion valve, a first indoor heat exchanger, a capillary tube and a check valve. A parallel circuit of a dehumidifying decompression means and a solenoid on-off valve, which is a series-parallel circuit, and a second indoor heat exchanger are sequentially piped to form a refrigeration cycle, and the four-way valve is switched to perform a cooling operation or a heating operation. When performing, close the solenoid on-off valve,
By controlling the opening degree of the electronic expansion valve, when performing a cooling dehumidifying operation or a heating dehumidifying operation, the electronic expansion valve is opened, the electromagnetic opening / closing valve is closed to operate the dehumidifying decompression means, and In an air conditioner configured to switch four-way valves, when stopping the compressor during the cooling / dehumidifying operation, first, the rotation speed of the compressor is set to the minimum rotation speed, and then the rotation speed is set to the minimum rotation speed. The air conditioner is configured so that the electronic expansion valve is fully closed, the electromagnetic on-off valve is opened after a lapse of a predetermined time, and the electronic expansion valve is gradually opened after a lapse of a predetermined time after a lapse of a predetermined time. The machine control method.

A method of controlling the air conditioner is set such that a predetermined time after the compressor is stopped and before the electromagnetic on-off valve is opened is a time immediately before the refrigerant flowing through the check valve is in a bubbling state.

[0006]

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, a control method for an air conditioner according to the present invention will be described in detail with reference to the drawings. FIG. 1 is a refrigerant circuit diagram showing a schematic configuration of a control method for an air conditioner of the present invention (and a conventional one). As shown in FIG. 1, a compressor 1, a four-way valve 2, an outdoor heat exchanger 3, an electronic expansion valve 4, a first indoor heat exchanger 5, a capillary tube 6 (6a, 6b, 6c) and a check valve 7. The parallel circuit of the dehumidifying decompression means 8 and the electromagnetic on-off valve 9 and the second indoor heat exchanger 10 are sequentially piped to form a refrigeration cycle. During the cooling operation, the electromagnetic on-off valve 9 is opened, the four-way valve 2 is switched, and the high-pressure refrigerant compressed by the compressor 1 is condensed in the outdoor heat exchanger 3 and decompressed by the electronic expansion valve 4. The first indoor heat exchanger 5 and the second indoor heat exchanger 10 are vaporized and circulated to the compressor 1. Further, during the heating operation, the electromagnetic opening / closing valve 9 is opened, the four-way valve 2 is switched, and the high-pressure refrigerant compressed by the compressor 1 is condensed in the second indoor heat exchanger 10 and the first indoor heat exchanger 5. Then, the pressure is reduced by the electronic expansion valve 4, evaporated in the outdoor heat exchanger 3, and circulated to the compressor 1. When the cooling / dehumidifying operation is performed, the electronic expansion valve 4 is opened, the electromagnetic opening / closing valve 9 is closed, the dehumidifying decompression means 8 is operated, and the four-way valve 2 is switched, whereby the compressor is closed. The high-pressure refrigerant compressed by 1 is condensed in the outdoor heat exchanger 3 and the first indoor heat exchanger 5, decompressed by the dehumidifying decompression means 8, and evaporated in the second indoor heat exchanger 10, It is adapted to be circulated to the compressor 1.

The operation of the above arrangement will be described below. FIG. 2 is a flow chart for explaining the control method of the air conditioner according to the present invention. The operation will be described below with reference to FIG. As shown in FIG. 2, when the four-way valve 2 is switched to the cooling side, the electronic expansion valve 4 is opened, and the electromagnetic opening / closing valve 9 is closed to perform the cooling / dehumidifying operation (ST1), for example, air When a stop command for the compressor 1 is issued (ST2) by stopping the operation or switching the operation mode by operating a remote controller (not shown) provided in the indoor unit of the harmony machine, first, the rotation speed of the compressor 1 Is controlled to the minimum speed (ST3), and the compressor 1
When the rotational speed reaches the minimum speed (ST4), the compressor 1 is stopped and the electronic expansion valve 4 is fully closed (ST5), and the liquid refrigerant flowing to the check valve 7 waits for a time just before it becomes a bubbling state. (ST6), the solenoid on-off valve 9 is opened (ST7),
After stopping the compressor 1 in the above (ST5), a certain time (2
After 40 minutes have passed (ST8), the electronic expansion valve 4 is gradually opened (ST9) for a fixed time (20 seconds). After these steps are completed, the operation start command of the compressor is accepted (ST10).

As described above, when a command to stop the compressor is issued during the cooling / dehumidifying operation, first, the rotation of the compressor is reduced to the minimum number of revolutions to reduce the pressure of the discharge gas and reduce the flow rate of the refrigerant. After that, the compressor is stopped, and at the same time, the electronic expansion valve is fully closed to stop the flow of the condensed refrigerant in the outdoor heat exchanger 3, and only the condensed refrigerant in the first indoor heat exchanger 5 is used for the dehumidification. The pressure of the dehumidifying decompression means 8 is balanced by flowing the pressure to the second indoor heat exchanger 10 side through the decompression means 8 to quickly eliminate the flow noise of the refrigerant flowing through the capillary tube 6 and the check valve 7 Since the electromagnetic on-off valve 9 is opened so that the refrigerant does not flow to the dehumidifying decompression means 8 just before the refrigerant foaming in which the operation becomes unstable, the generation of abnormal noise from the check valve 7 is prevented. After that, the electronic expansion valve 4 is gradually opened so that the compressed gas in the outdoor heat exchanger 3 is gradually flowed through the electromagnetic opening / closing valve 9 so as to balance the pressure. do not do.

[0009]

As described above, according to the air conditioner control method of the present invention, when the compressor is stopped during the cooling / dehumidifying operation, first, the rotation speed of the compressor is set to the minimum rotation speed. After stopping the compressor after reaching the minimum rotation speed, fully closing the electronic expansion valve, opening the electromagnetic on-off valve after a predetermined time has elapsed, and after a certain time has passed, the electronic expansion valve is multiplied by a certain time. Since the refrigerant is gradually opened, the flow noise of the refrigerant flowing through the capillary tube can be eliminated at an early stage, and the abnormal noise from the check valve can be prevented.

[Brief description of drawings]

FIG. 1 is a refrigerant circuit diagram showing a schematic configuration of an air conditioner of the present invention (and a conventional one).

FIG. 2 is a flow chart for explaining a control method for an air conditioner according to the present invention.

FIG. 3 is a flowchart for explaining a conventional air conditioner control method.

[Explanation of symbols]

1 compressor 2 four-way valve 3 outdoor heat exchanger 4 Electronic expansion valve 5 First indoor heat exchanger 6 (6a, 6b, 6c) Capillary tube 7 Check valve Decompression means for dehumidification 9 solenoid valve 10 Second indoor heat exchanger

Claims (2)

[Claims] 1. A compressor, a four-way valve, an outdoor heat exchanger, an electronic expansion valve, a first indoor heat exchanger, a dehumidifying decompression means comprising a series-parallel circuit of a capillary tube and a check valve, and an electromagnetic on-off valve. A parallel circuit and a second indoor heat exchanger are sequentially piped to form a refrigeration cycle. When the four-way valve is switched to perform a cooling operation or a heating operation, the electromagnetic on-off valve is closed and the electronic When the cooling dehumidifying operation or the heating dehumidifying operation is performed, the opening of the expansion valve is controlled, and the electronic expansion valve is opened, the electromagnetic opening / closing valve is closed, and the dehumidifying means for dehumidification is operated, and the four-way valve is used. When stopping the compressor during cooling and dehumidifying operation in an air conditioner configured to switch between, first, set the number of revolutions of the compressor to the minimum number of revolutions, and then stop the compressor And fully close the electronic expansion valve Wherein opening the electromagnetic on-off valve after a predetermined time, after a predetermined time has elapsed, the control method of an air conditioner characterized by comprising as to open gradually, and multiplying the electronic expansion valve a predetermined time. 2. The predetermined time until the electromagnetic on-off valve is opened after the compressor is stopped is set to a time immediately before the refrigerant flowing through the check valve is in a bubbling state. Air conditioner control method.