JPH1137588A - Air-conditioner - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an effective air conditioner that can maintain path balance even on capacity control operation. SOLUTION: In an air-conditioner, first solenoid switching valve 7 is provided at an intermediate position of one refrigerant channel 5b of a two-channel indoor heat exchanger 5 so as to divide the refrigerant channel 5b into a first refrigerant channel 5b1 and a second refrigerant channel 5b2, a first bypass channel 8 consisting of a refrigerant tube that is narrower than the refrigerant channel 5b is connected between the first solenoid switching valve and a second refrigerant channel 5b2 from the inlet of the first refrigerant channel 5b1, and a second bypass channel 9 consisting of the refrigerant tube that is narrower than the refrigerant channel 5b is connected to the outlet of the second refrigerant channel 5b2 from the area between the first refrigerant channel 5b1 and the first solenoid switching valve. On capacity control operation, the first solenoid switching valve is closed and one refrigerant channel is set to a two-path operation. On normal operation, the first solenoid switching valve is opened, the other refrigerant channel is set to a one-path operation and is added to one refrigerant 5b for forming a two-path operation, thus maintaining path balance and achieving effective operation on both of normal and capacity control operation.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an air conditioner equipped with a heat pump type refrigeration cycle for both cooling and heating and capable of capacity control operation, and in particular, maintains a path balance during capacity control operation to reduce the efficiency. Regarding what was to be prevented.

[0002]

2. Description of the Related Art Conventionally, as shown in FIG. 1, a refrigerant discharged from a discharge port of a compressor 1 is supplied to a four-way valve 2, an outdoor heat exchanger 3, a decompressor 4, and two refrigerant passages 5a and 5b. An indoor heat exchanger 5 provided with an electromagnetic on-off valve 6 for capacity control in one refrigerant flow path 5a, and a heat pump refrigeration cycle circulating to a suction port of the compressor 1 via a four-way valve 2. The capacity control operation can be performed by controlling the opening and closing of the on-off valve 6. The number of passes (the number of channels) of the indoor heat exchanger 5 is determined by balancing the heat transfer performance as a condenser and the pressure loss as an evaporator. However, in this configuration,
During the capacity control operation in which the electromagnetic on-off valve 6 is closed and the compressor 1 is operated at a higher rotation speed, the number of passes of the refrigerant in the indoor heat exchanger 5 becomes 1, the path balance is lost, and the heat transfer performance is reduced. The performance as a condenser increases with the improvement, but there is a problem that the cycle efficiency as an evaporator decreases due to an increase in pressure loss.

[0003]

SUMMARY OF THE INVENTION An object of the present invention is to solve the above-mentioned problems and to provide an efficient air conditioner which maintains a path balance even during a capacity control operation.

[0004]

According to the present invention, a refrigerant discharged from a discharge port of a compressor is provided with a four-way valve, an outdoor heat exchanger, a pressure reducer, and two refrigerant passages. And
An indoor heat exchanger provided with an electromagnetic on-off valve for capacity control in one of the refrigerant passages, a heat pump refrigeration cycle circulating to the suction port of the compressor via a four-way valve, and by opening and closing the electromagnetic on-off valve In the air conditioner capable of capacity control operation, a first solenoid on-off valve is interposed between the other refrigerant flow path of the indoor heat exchanger and the first refrigerant flow path and the second refrigerant flow path.
The first refrigerant flow path is divided in series with the first refrigerant flow path, and has a smaller diameter than the first refrigerant flow path between the first solenoid on-off valve and the second refrigerant flow path from the inlet of the first refrigerant flow path. A first bypass flow path composed of a refrigerant pipe is connected, and a diameter smaller than the second refrigerant flow path from between the first refrigerant flow path and the first solenoid on-off valve to an outlet of the second refrigerant flow path. A second bypass flow path composed of a refrigerant pipe is connected, the electromagnetic on / off valve for controlling the capacity is closed, and the first electromagnetic on / off valve is closed during the capacity control operation in which the compressor is operated by increasing the rotation. In the meantime, while the other refrigerant flow path has two paths, the capacity control electromagnetic on-off valve is opened, and during normal operation in which the rotation of the compressor is reduced, the first electromagnetic on-off valve is opened. The air conditioner was controlled so that the refrigerant flow path of 1 was one path, and was controlled to be two paths together with one of the refrigerant flow paths.

In addition, the first bypass passage or the second bypass passage
The diameter of the refrigerant pipe of the bypass flow path is less than half the diameter of each refrigerant pipe of the first refrigerant flow path or the second refrigerant flow path, and the first refrigerant flow path or the second refrigerant flow path is When the first bypass flow path or the second bypass flow path is connected in parallel, the refrigerant almost flows through the first refrigerant flow path or the second refrigerant flow path, and the first bypass flow path or the second bypass flow path It did not flow into the flow path.

[0006]

As described above, in the air conditioner of the present invention, the first refrigerant on-off valve is interposed in the middle of the other refrigerant flow path of the indoor heat exchanger. Channel and second
The first refrigerant flow path is divided in series with the first refrigerant flow path, and has a smaller diameter than the first refrigerant flow path between the first solenoid on-off valve and the second refrigerant flow path from the inlet of the first refrigerant flow path. A first bypass flow path composed of a refrigerant pipe is connected, and a diameter smaller than the second refrigerant flow path from between the first refrigerant flow path and the first solenoid on-off valve to an outlet of the second refrigerant flow path. A second bypass flow path composed of a refrigerant pipe is connected, the electromagnetic on / off valve for controlling the capacity is closed, and the first electromagnetic on / off valve is closed during the capacity control operation in which the compressor is operated by increasing the rotation. In the meantime, while the other refrigerant flow path has two paths, the capacity control electromagnetic on-off valve is opened, and during normal operation in which the rotation of the compressor is reduced, the first electromagnetic on-off valve is opened. The number of passes during normal operation and during the capacity control operation can be controlled so that the refrigerant flow path is one path and two paths are combined with one of the refrigerant flow paths. It can be the same, neither collapse path balance during capacity control operation, thereby enabling efficient operation.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, an air conditioner according to the present invention will be described in detail with reference to the drawings. FIG. 1 is a system diagram showing a refrigeration cycle of an air conditioner according to the related art and the present invention, and FIG. 2 is a main part refrigerant flow diagram showing details of a heat exchanger of the air conditioner according to the present invention. FIG. 1 has been described in the section of the related art, and a description thereof will be omitted. In FIG. 2, reference numeral 7 denotes a first electromagnetic on-off valve, which is interposed in the middle of the refrigerant flow path 5b on the side where the electromagnetic on-off valve 6 for controlling the capacity of the heat exchanger 5 is not connected. The electromagnetic on-off valve 7 divides the refrigerant flow path 5b into a first refrigerant flow path 5b1 and a second refrigerant flow path 5b2 in series. Reference numeral 8 denotes a first bypass passage, which is connected between the first electromagnetic on-off valve 7 and the second coolant passage 5b2 from the inlet of the first coolant passage 5b1. Reference numeral 9 denotes a second bypass flow passage which is connected between the first refrigerant flow passage 5b1 and the first solenoid on-off valve 7 to an outlet of the second refrigerant flow passage 5b2. Each of the bypass passages 8 and 9 is formed of a refrigerant pipe smaller (for example, half) in diameter than the first refrigerant passage 5b1 and the second refrigerant passage 5b2.

Next, the operation of the above configuration will be described. At the time of normal operation in which the rotation speed of the compressor 1 is reduced, the electromagnetic on-off valve 6 for controlling the capacity is opened and the refrigerant flows through one of the refrigerant channels 5a, and the other refrigerant channel 5b
Since the first solenoid on-off valve 7 of the refrigerant channel 5b is opened,
The refrigerant becomes one path that circulates through the first refrigerant flow path 5b1, the first electromagnetic release valve 7, and the second refrigerant flow path 5b2,
The one refrigerant flow path 5a and the other refrigerant flow path 5b together constitute two passes. Now, at the time of the capacity control operation in which the rotation speed of the compressor 1 is increased and the electromagnetic on-off valve 6 for capacity control is closed, the refrigerant does not flow through one refrigerant flow path 5a and the other refrigerant flow path 5b Since the first electromagnetic on-off valve 7 of the refrigerant flow path 5b is closed, the refrigerant flows from the first refrigerant flow path 5b1 to the second bypass flow path 9 and from the first bypass flow path 8 The number of paths is the same as the number of paths during normal operation, which is two paths including the path flowing through the second refrigerant flow path 5b2.

[0009]

As described above, according to the air conditioner of the present invention, the first refrigerant is provided by interposing the first solenoid on-off valve in the middle of the other refrigerant flow path of the indoor heat exchanger. Channel and second
The first refrigerant flow path is divided in series with the first refrigerant flow path, and has a smaller diameter than the first refrigerant flow path between the first solenoid on-off valve and the second refrigerant flow path from the inlet of the first refrigerant flow path. A first bypass flow path composed of a refrigerant pipe is connected, and a diameter smaller than the second refrigerant flow path from between the first refrigerant flow path and the first solenoid on-off valve to an outlet of the second refrigerant flow path. A second bypass flow path composed of a refrigerant pipe is connected, the electromagnetic on / off valve for controlling the capacity is closed, and the first electromagnetic on / off valve is closed during the capacity control operation in which the compressor is operated by increasing the rotation. In the meantime, while the other refrigerant flow path has two paths, the capacity control electromagnetic on-off valve is opened, and during normal operation in which the rotation of the compressor is reduced, the first electromagnetic on-off valve is opened. The number of passes during normal operation and during the capacity control operation can be controlled so that the refrigerant flow path is one path and two paths are combined with one of the refrigerant flow paths. It can be the same, neither collapse path balance during capacity control operation, thereby enabling efficient operation.

[Brief description of the drawings]

FIG. 1 is a system diagram of a refrigeration cycle showing an air conditioner according to the related art and the present invention.

FIG. 2 is a main part refrigerant flow diagram showing details of an indoor heat exchanger of the air conditioner according to the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Compressor 2 Four-way valve 3 Outdoor heat exchanger 4 Decompressor 5 Indoor heat exchanger 5a One refrigerant flow path 5b The other refrigerant flow path 5b1 First refrigerant flow path 5b2 Second refrigerant flow path 6 Electromagnetic on-off valve 7 First electromagnetic on-off valve 8 First bypass flow path 9 Second bypass flow path

Claims (2)

[Claims] 1. A refrigerant discharged from a discharge port of a compressor,
An indoor heat exchanger having a four-way valve, an outdoor heat exchanger, a decompressor, and two refrigerant flow paths, and an electromagnetic on-off valve for capacity control in one of the refrigerant flow paths, and a suction port of the compressor via the four-way valve. An air conditioner comprising a heat pump refrigeration cycle that circulates in the air conditioner and capable of controlling the capacity by opening and closing the electromagnetic on-off valve. A first refrigerant flow path and a second refrigerant flow path are divided in series with an on-off valve interposed, and the first refrigerant flow path
A first bypass flow path comprising a refrigerant pipe having a smaller diameter than the first refrigerant flow path is connected between the electromagnetic on-off valve and the second refrigerant flow path, and the first refrigerant flow path and the first electromagnetic flow path are connected to each other. The second from between the on-off valve
A second bypass flow path composed of a refrigerant pipe having a diameter smaller than that of the second refrigerant flow path is connected to the outlet of the refrigerant flow path, the electromagnetic control valve for controlling the capacity is closed, and the rotation of the compressor is increased. During the capacity control operation to be performed, the first solenoid on-off valve is closed, and the other refrigerant flow path is set to two paths, while the capacity control solenoid on-off valve is opened to operate the compressor with the rotation of the compressor lowered. During normal operation, the first solenoid on-off valve is opened, the other refrigerant flow path is controlled to be one path, and one of the refrigerant flow paths is controlled to perform two paths. Machine. 2. The diameter of the refrigerant pipe of the first bypass flow path or the second bypass flow path is set to the first refrigerant flow path or the second refrigerant flow path.
When less than half the diameter of each refrigerant pipe of the refrigerant flow path, and the first refrigerant flow path or the second refrigerant flow path and the first bypass flow path or the second bypass flow path are connected in parallel, The air conditioner according to claim 1, wherein the refrigerant hardly flows in the first refrigerant flow path or the second refrigerant flow path, and does not flow in the first bypass flow path or the second bypass flow path. Machine.