JPH06337186A - Defrosting controller for air-conditioning machine - Google Patents

Abstract

PURPOSE:To provide a defrosting controller for an air-conditioning machine, which permits defrosting operation even during heating operation and does not give uncomfortable sense. CONSTITUTION:The controller is provided with a capillary tube 5 for bypassing and a solenoid valve 7 for bypassing in series to a bypass circuit 10, in which a gas side pipeline 2 at the compressor 102 side of an outdoor heat exchanger 1 and a lowpressure side pipeline 8 at the suction side of the compressor 102 upon cooling operation are connected through branch pipes 3, 9, while a refrigeating cycle circuit 6 and a bypass circuit 10 are passed through the inside of the outdoor heat exchanger 1.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a defrost control device for an air conditioner during heating.

[0002]

2. Description of the Related Art In recent years, along with the widespread use of air conditioners capable of heating operation, there is an increasing demand for a defrosting control device for an air conditioner capable of performing defrosting operation without stopping heating operation. .

The structure of a conventional defrost control device for an air conditioner of this type will be described with reference to FIG. As shown in the figure, the compressor 102 and the four-way valve 10 are provided on the outdoor unit 101 side.
3, outdoor heat exchanger 104, capillary tube 10
5, the first three-way valve 106 is sequentially connected and connected to the indoor heat exchanger 108 on the indoor unit 107 side.
The refrigeration cycle circuit from 08 returns to the compressor 102 via the second three-way valve 109 and the four-way valve 103.

The heat exchanging fan motor 110,
A gas temperature pipe on the compressor 102 side of the outdoor heat exchanger 104 is provided with a coil temperature sensor 111 for detecting the temperature of the refrigerant, and the compressor 102, a four-way valve depending on the temperature detected by the coil temperature sensor 111. 103, the heat exchange fan motor 110 is operated, and a control circuit 112 for controlling the cooling or heating operation is provided.

In the above structure, when the temperature of the outdoor heat exchanger 104 drops during the heating operation, the outdoor heat exchanger 1
In order to prevent frost on 04, the four-way valve 103 was switched to stop the heating operation, and the defrosting operation, that is, the cooling operation was performed to warm the outdoor heat exchanger 104 to perform defrosting.

[0006]

In such a conventional defrosting control device for an air conditioner, when the heating operation is performed in a situation where the outside air temperature is extremely low, the frost prevention control for the outdoor heat exchanger 104 is performed. However, there is a problem that the indoor temperature decreases during the defrosting operation, the heating efficiency deteriorates, and the user feels uncomfortable.

The present invention solves the above problems and provides a defrosting control device for an air conditioner that enables defrosting operation and does not cause discomfort even when the air conditioner is in heating operation. With the goal.

[0008]

In order to achieve the above object, a defrost control device for an air conditioner of the present invention has a compressor, a four-way valve, an outdoor heat exchanger, a capillary tube, and
A refrigeration cycle circuit provided with a three-way valve etc. and an indoor heat exchanger on the indoor unit side, a gas side pipe on the compressor side of the outdoor heat exchanger, and a suction side of the compressor during cooling A bypass circuit formed by connecting a low-pressure side pipe through a branch pipe, a bypass capillary tube and a bypass solenoid valve connected in series to the bypass circuit, and the bypass circuit in the outdoor heat exchanger It is configured to pass through.

[0009]

According to the present invention, when the temperature of the outdoor heat exchanger drops during heating operation, the refrigerant discharged from the compressor and passed through the four-way valve passes through the outdoor heat exchanger when the temperature of the outdoor heat exchanger decreases. By splitting the flow into the refrigeration cycle circuit and the bypass circuit, the outdoor heat exchanger is heated by the refrigerant flowing in the bypass circuit and defrosting is performed.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to FIG. The same parts as those of the conventional example are designated by the same reference numerals and detailed description thereof will be omitted.

As shown in the drawing, a bypass capillary tube 5 is connected to a bypass pipe 4 branched from a first branch pipe 3 in a gas side pipe 2 on the compressor 102 side of an outdoor heat exchanger 1 for refrigeration. The refrigeration cycle circuit 6 is passed through the outdoor heat exchanger 1 through which the cycle circuit 6 passes in parallel, and a second branch is made via the bypass solenoid valve 7 to the low pressure side pipe 8 on the suction side of the cooling compressor 102. A tube 9 is provided and connected to form a bypass circuit 10. And the coil temperature sensor 11
A control circuit 11 is provided that controls the compressor 102, the four-way valve 103, the heat exchanger fan motor 110, and the bypass solenoid valve 7 to operate in accordance with the temperature detected in 1 to perform cooling or heating operation. .

In the above structure, the coil temperature sensor 111 indicates that the temperature of the outdoor heat exchanger 1 has decreased during the heating operation.
Is detected, the bypass solenoid valve 7 is opened via the control circuit 11, and a part of the refrigerant passing through the refrigeration cycle circuit 6 is discharged from the second branch pipe 9 to the bypass solenoid valve 7, the outdoor heat exchanger 1, To the outdoor heat exchanger 1, which is divided into the bypass circuit 10 passing through the bypass capillary tube 5 and the first branch pipe 3 and through which the low-temperature refrigerant in the refrigeration cycle circuit 6 has passed,
The high temperature refrigerant flowing through the bypass circuit 10 will pass through.

That is, since the bypass circuit 10 is provided in parallel with the refrigeration cycle circuit 6 in the outdoor heat exchanger 1, the high temperature refrigerant flowing in the bypass circuit 10 causes
The outdoor heat exchanger 1, which has become low temperature and is in a frosted state, is heated and defrosted.

Then, the high-temperature refrigerant that is not diverted to the bypass circuit 10 flows into the indoor heat exchanger 108 as in the normal heating operation, and heating of the room is continued.

As described above, according to the embodiment of the present invention, a part of the high temperature refrigerant is diverted through the bypass circuit 10 during the heating operation, and the low temperature refrigerant flows through the refrigeration cycle circuit 6.
Through the outdoor heat exchanger 1 through which the outdoor heat exchanger 1
Since it is possible to heat and defrost, it is possible to perform defrost during the heating operation.

[0016]

As is apparent from the above embodiments, according to the present invention, the refrigeration cycle circuit in which the high temperature refrigerant discharged from the compressor during the heating operation passes through the indoor heat exchanger and the outdoor heat exchanger Since a high-temperature refrigerant splits without passing through the indoor heat exchanger and a bypass circuit that passes through the outdoor heat exchanger is provided, defrosting operation can be performed without stopping heating operation A defrost control device for an air conditioner that does not cause discomfort can be provided.

[Brief description of drawings]

FIG. 1 is a circuit diagram showing a configuration of a defrost control device for an air conditioner according to an embodiment of the present invention.

FIG. 2 is a circuit diagram showing a configuration of a conventional defrost control device for an air conditioner.

[Explanation of symbols]

 1 Outdoor Heat Exchanger 2 Gas Side Pipe 3 Branch Pipe 5 Bypass Capillary Tube 6 Refrigeration Cycle Circuit 7 Bypass Solenoid Valve 8 Low Pressure Side Pipe 9 Branch Pipe 10 Bypass Circuit 102 Compressor 103 Four-way Valve 105 Capillary Tube 106 Three-way Valve 108 Indoor Heat exchanger 109 3-way valve

Claims (1)

[Claims] 1. A refrigeration cycle circuit formed by providing a compressor, a four-way valve, an outdoor heat exchanger, a capillary tube, a three-way valve, etc. on the outdoor unit side and an indoor heat exchanger on the indoor unit side, and the outdoor unit. A bypass circuit formed by connecting a gas side pipe on the compressor side of the heat exchanger and a low pressure side pipe on the suction side of the cooling compressor via a branch pipe, and a bypass connected in series to this bypass circuit Defrosting control device for an air conditioner, which comprises a capillarity tube and a bypass solenoid valve, and is configured to pass the bypass circuit through the outdoor heat exchanger.