JP2003156242A - Control method for air-conditioner - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a control method for an air-conditioner, preventing the flow sounds of a cooling medium flowing in a capillary tube during cooling and dehumidifying operation after stopping a compressor. SOLUTION: When the compressor 1 is stopped during the cooling and dehumidifying operation, the rotating speed of the compressor is first controlled to the minimum rotating speed. After the rotating speed of the compressor 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 second solenoid selector valve 12 is opened, and after the passage of a certain time, the electronic expansion valve is gradually opened in a certain time. Thus, no flow sounds of the cooling medium flowing in the capillary tube 6 in an interior unit can be made earlier.

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. 4, 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 flow chart of FIG. 5, 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, when a command to stop 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 air conditioner, conventionally, , The compressor 1 is immediately stopped (ST3 '), and even if an operation start command for the compressor 1 is issued, mask control is performed (ST4') so as not to start for 3 minutes, which is a time period in which the pressure balance of the refrigerant is balanced. Three
After the lapse of minutes, the operation start command is accepted (ST5 '). 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, there was a problem that an abnormal noise of the liquid refrigerant flowing through the capillary tube 6 was heard. Therefore, although not shown, conventionally, the dehumidifying decompression means 8 was wrapped with a butyl rubber sheet so as to prevent the abnormal noise from leaking to the outside. However, the abnormal noise could not be completely removed, which was a problem. .

[0003]

SUMMARY OF THE INVENTION The present invention solves the problems described above, and controls an air conditioner which prevents the generation of flowing noise of the refrigerant flowing through the capillary tube after the compressor is stopped during the cooling / dehumidifying operation. It is intended to provide a way.

[0004]

To solve the above problems, the present invention provides a compressor, a four-way valve, an outdoor heat exchanger and an electronic expansion valve provided in an outdoor unit, and a first indoor heat exchange provided in an indoor unit. Circuit, a parallel circuit of a dehumidifying decompression means consisting of a series-parallel circuit of a capillary tube and a check valve, and a first electromagnetic on-off valve, and
A refrigeration cycle is configured by sequentially piping the second indoor heat exchanger, and when performing a cooling operation or a heating operation, the first electromagnetic opening / closing valve is closed and the opening degree of the electronic expansion valve is controlled. When the cooling dehumidifying operation or the heating dehumidifying operation is performed, the electronic expansion valve is opened, and the first electromagnetic opening / closing valve is closed to operate the dehumidifying decompression means. A bypass circuit in which a series circuit of a capillary tube and a second electromagnetic opening / closing valve is connected to the outdoor unit side between the electronic expansion valve and the outdoor heat exchanger and between the second indoor heat exchanger and the four-way valve. When the cooling and dehumidifying operation is closed, the second electromagnetic on-off valve is closed, and when the compressor is stopped during the cooling and dehumidifying operation, first, the rotation speed of the compressor is controlled to the minimum rotation speed, When the rotation speed of the compressor reaches the minimum rotation speed, the same pressure is applied. The machine is stopped, the electronic expansion valve is fully closed, the second electromagnetic opening / closing valve is opened after a lapse of a predetermined time, and after the elapse of a certain time, the electronic expansion valve is gradually opened by taking a certain time. The control method for the air conditioner is as follows.

For dehumidification by a compressor, a four-way valve, an outdoor heat exchanger and an electronic expansion valve provided in the outdoor unit, a first indoor heat exchanger provided in the indoor unit, and a series-parallel circuit of a capillary tube and a check valve. A parallel circuit of the pressure reducing means and the first electromagnetic on-off valve, and
A refrigeration cycle is configured by sequentially piping the second indoor heat exchanger, and when performing a cooling operation or a heating operation, the first electromagnetic opening / closing valve is closed and the opening degree of the electronic expansion valve is controlled. When the cooling dehumidifying operation or the heating dehumidifying operation is performed, the electronic expansion valve is opened, and the first electromagnetic opening / closing valve is closed to operate the dehumidifying decompression means. A bypass circuit in which a series circuit of a capillary tube and a second electromagnetic on-off valve is connected is provided on the outdoor unit side between the outdoor heat exchanger and the four-way valve and on the outdoor unit side between the second indoor heat exchanger and the four-way valve. If the second electromagnetic opening / closing valve is closed during the cooling / dehumidifying operation and the compressor is stopped during the cooling / dehumidifying operation, first, the rotation speed of the compressor is controlled to the minimum rotation speed, and the compression is performed. When the rotation speed of the machine reaches the minimum rotation speed, While stopped, the electronic expansion valve is fully closed, after a predetermined time elapses, opening the second solenoid valve,
The control method of the air conditioner is such that the electronic expansion valve is gradually opened after a lapse of a certain period of time for a certain period of time.

An air conditioner control method is provided in which a predetermined time after the compressor is stopped and before the second electromagnetic on-off valve is opened is set to a time immediately before the refrigerant flowing through the dehumidifying decompression means is in a foaming state. .

[0007]

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 according to the first aspect of the present invention. As shown in FIG. 1, the outdoor unit 2
0, a compressor 1, a four-way valve 2, an outdoor heat exchanger 3, an electronic expansion valve 4, and a first indoor heat exchanger 5 provided in the indoor unit 30,
Capillary tube 6 (6a, 6b, 6c) and check valve 7
Dehumidifying decompression means 8 and a solenoid on-off valve 9 which are formed in a series-parallel circuit with
The parallel circuit and the second indoor heat exchanger 10 are sequentially piped to form a refrigeration cycle. Further, a capillary tube 11 and a second electromagnetic opening / closing valve are provided on the outdoor unit 20 side between the electronic expansion valve 4 and the outdoor heat exchanger 3 and between the second indoor heat exchanger 10 and the four-way valve 2. A bypass circuit 13 connected to a series circuit of 12 is provided, and the second electromagnetic on-off valve 12 is closed during normal operation so that the refrigerant does not flow. Then, during the cooling operation, the solenoid 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 outdoor heat exchanger 3 and decompressed by the electronic expansion valve 4, and the first indoor heat exchanger 5 and the second indoor heat exchanger 5 It is evaporated in the indoor heat exchanger 10 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 performing the cooling / dehumidifying operation, the electronic expansion valve 4 is opened and the electromagnetic opening / closing valve 9 is opened.
Is closed and the decompression means 8 for dehumidification is operated, and the four-way valve 2 is switched to the cooling side, so that the high-pressure refrigerant compressed by the compressor 1 becomes the outdoor heat exchanger 3 and the first indoor heat exchanger 5 Is condensed by the electronic expansion valve 4 and the pressure is reduced by the second
It is evaporated in the indoor heat exchanger 10 and circulated to the compressor 1.

FIG. 2 is a refrigerant circuit diagram showing a schematic configuration of a control method for an air conditioner according to the second aspect of the present invention. Second
Of the present invention and the first invention shown in FIG. 1 are the same except that the connection position of the bypass circuit 13, which is a series circuit of the capillary tube 11 and the second electromagnetic on-off valve 12, is different. Omit it. That is, the bypass circuit 13
In the first invention, between the electronic expansion valve 4 and the outdoor heat exchanger 3, and between the second indoor heat exchanger 10 and the four-way valve 2.
Although it is provided on the outdoor unit 20 side between and, in the second invention, between the outdoor heat exchanger 3 and the four-way valve 2, and between the second indoor heat exchanger 10 and the four-way valve 2. It is installed on the outdoor unit side.

The operation of the above arrangement will be described below. FIG. 3 is a flow chart for explaining the control method of the air conditioner according to the present invention. The control method will be described below with reference to FIG. As shown in FIG.
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, an indoor unit of an air conditioner is equipped. 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), first, the rotational speed of the compressor 1 is set to the minimum rotational speed. (ST3), the compressor 1
Is the minimum number of revolutions (ST4), the compressor 1 is stopped and the electronic expansion valve 4 is fully closed (ST5), until just before the liquid refrigerant flowing to the dehumidifying decompression means 8 becomes a foaming state. After waiting for a time (ST6), the second electromagnetic on-off valve 12 is opened (ST7), and after the compressor 1 is stopped in (ST5), a predetermined time (2 minutes and 40 seconds) has elapsed (ST8), and then the electronic The expansion valve 4 is gradually opened for a fixed time (20 seconds) (ST9). After these steps are completed, an operation start command for the compressor is accepted (ST1
0).

As described above, when a command to stop the compressor 1 is issued during the cooling and dehumidifying operation, first, the rotation of the compressor 1 is reduced to the minimum number of revolutions to reduce the pressure of the discharge gas to reduce the flow amount of the refrigerant. After reducing the flow rate, the compressor 1 is stopped, and at the same time, the electronic expansion valve 4 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 stopped. To the second indoor heat exchanger 10 via the dehumidifying decompression means 8.
The pressure of the decompressing means 8 for dehumidification is quickly balanced by flowing to the side, the flow noise of the refrigerant flowing through the capillary tube 6 is eliminated early, and the operation of the check valve 7 becomes unstable. Open the solenoid on-off valve 12 to open the outdoor heat exchanger 3
The condensed refrigerant inside flows through the capillary tube 11 between the four-way valve 2 and the second indoor heat exchanger 10, but the condensed refrigerant is stopped by the check valve 7 and the first indoor heat exchanger 5 Does not flow back into the capillary tube 6 of the dehumidifying decompression means 8 and thus the flow noise is prevented. Also, the capillary tube 1
Since 1 is provided on the outdoor unit side, the capillary tube 1
The flowing sound of the refrigerant flowing through No. 1 cannot be heard in the room. After that, the electronic expansion valve 4 is gradually opened to open the outdoor heat exchanger 3
Since the compressed gas therein is gradually flowed through the electromagnetic on-off valve 9 to balance the pressure, no abnormal noise is generated thereafter.

[0011]

As described above, according to the air conditioner control method of the present invention, when the compressor is stopped during the cooling and dehumidifying operation, first, the rotational speed of the compressor is set to the minimum rotational speed. When the rotation speed of the compressor reaches the minimum rotation speed, the compressor is stopped, the electronic expansion valve is fully closed, and after a lapse of a predetermined time, the second electromagnetic opening / closing valve is opened to a constant value. After the lapse of time, the electronic expansion valve is gradually opened for a certain period of time, so that the flow noise of the refrigerant flowing through the capillary tube can be eliminated early.

[Brief description of drawings]

FIG. 1 is a refrigerant circuit diagram showing a schematic configuration of an air conditioner according to a first aspect of the present invention.

FIG. 2 is a refrigerant circuit diagram showing a schematic configuration of an air conditioner according to a second aspect of the present invention.

FIG. 3 is a flowchart for explaining a control method for an air conditioner according to the present invention.

FIG. 4 is a refrigerant circuit diagram showing a schematic configuration of a conventional air conditioner.

FIG. 5 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 First solenoid valve 10 Second indoor heat exchanger 11 Capillary tube 12 Second solenoid valve 13 Bypass circuit

Claims (3)

[Claims] 1. A compressor, a four-way valve, an outdoor heat exchanger and an electronic expansion valve provided in an outdoor unit, a first indoor heat exchanger provided in an indoor unit, and a series-parallel circuit of a capillary tube and a check valve. A parallel circuit of the dehumidifying decompression means and the first electromagnetic on-off valve and a second indoor heat exchanger are sequentially piped to form a refrigeration cycle. When performing a cooling operation or a heating operation, the first electromagnetic valve is used. The opening / closing valve is closed to control the opening degree of the electronic expansion valve, and when the cooling / dehumidifying operation or the heating / dehumidifying operation is performed, the electronic expansion valve is opened and the first electromagnetic opening / closing valve is closed to perform the dehumidification. An air conditioner configured to operate a pressure reducing means for use between the electronic expansion valve and the outdoor heat exchanger, and the second
A bypass circuit in which a series circuit of a capillary tube and a second electromagnetic opening / closing valve is connected is provided on the outdoor unit side between the indoor heat exchanger and the four-way valve, and the second electromagnetic opening / closing valve is connected during the cooling / dehumidifying operation. In the case of blocking and stopping the compressor during the cooling and dehumidifying operation, first, the rotation speed of the compressor is controlled to the minimum rotation speed, and when the rotation speed of the compressor reaches the minimum rotation speed, the compressor is stopped. While stopping, the electronic expansion valve is fully closed, the second electromagnetic opening / closing valve is opened after a lapse of a predetermined time, and after the elapse of a certain time, the electronic expansion valve is gradually opened by taking a certain time. A method for controlling an air conditioner, which is characterized by the above. 2. A compressor, a four-way valve, an outdoor heat exchanger and an electronic expansion valve provided in the outdoor unit, a first indoor heat exchanger provided in the indoor unit, and a series-parallel circuit of a capillary tube and a check valve. A parallel circuit of the dehumidifying decompression means and the first electromagnetic on-off valve and a second indoor heat exchanger are sequentially piped to form a refrigeration cycle. When performing a cooling operation or a heating operation, the first electromagnetic valve is used. The opening / closing valve is closed to control the opening degree of the electronic expansion valve, and when the cooling / dehumidifying operation or the heating / dehumidifying operation is performed, the electronic expansion valve is opened and the first electromagnetic opening / closing valve is closed to perform the dehumidification. In the air conditioner configured to operate the pressure reducing means for use, a capillary tube is provided on the outdoor unit side between the outdoor heat exchanger and the four-way valve and between the second indoor heat exchanger and the four-way valve. By connecting a series circuit with the second solenoid valve In order to close the second electromagnetic on-off valve during the cooling / dehumidifying operation and stop the compressor during the cooling / dehumidifying operation, first, control the rotation speed of the compressor to the minimum rotation speed. Then, when the number of rotations of the compressor reaches the minimum number of rotations, the compressor is stopped, the electronic expansion valve is fully closed, and after a lapse of a predetermined time, the second electromagnetic opening / closing valve is opened and a certain time elapses. After that, the method for controlling an air conditioner is characterized in that the electronic expansion valve is gradually opened for a certain period of time. 3. The predetermined time until the second electromagnetic on-off valve is opened after the compressor is stopped is set to a time immediately before the refrigerant flowing through the dehumidifying decompression means is foamed. The method for controlling an air conditioner according to claim 1 or 2.