JPH109701A - Refrigerating cycle - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a refrigerating cycle for returning much liquid refrigerant upon start of a heating operation, increasing the amount of circulation and improving a heat exchanging efficiency and accelerating the heating time of a room. SOLUTION: A refrigerating cycle comprises a compressor 1, a four-way valve 2, an outdoor side heat exchanger 3, a pressure reducing device 6 and an indoor side heat exchanger 7 which are connected together by a refrigerant pipeline. In this case, a parallel circuit having a check valve 4 and a throttle valve 5 is provided between the outdoor side heat exchanger 3 and the pressure reducing device 6. A temperature sensor 8 for detecting the pipeline temperature of the indoor side heat exchanger 7 is provided. When a heating operation begins, the throttle valve 5 is completely opened. When the pipeline temperature detected by the temperature sensor 8 reaches a set temperature, the throttle valve 5 is throttled to a prescribed degree.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a refrigeration cycle, and more particularly, to a throttle valve for increasing a circulation amount of a liquid refrigerant at the start of a heating operation.

[0002]

2. Description of the Related Art As shown in FIG. 2, for example, a conventional refrigeration cycle used for an air conditioner includes a compressor 1, a four-way valve 2, an outdoor heat exchanger 3, a check valve 4, The throttle valve (capillary tube) 5 ′ connected in parallel to the check valve 4, the pressure reducer 6, and the indoor heat exchanger 7 were connected by a refrigerant pipe.

According to the above configuration, in FIG. 2, solid arrows indicate the direction of refrigerant flow during a heating operation, and broken arrows indicate the direction of refrigerant flow during a cooling operation. In the above refrigeration cycle, during the heating operation, the high-temperature and high-pressure gas refrigerant discharged from the compressor 1 in the outdoor unit passes through the four-way valve 2 and then flows through the indoor heat exchanger 7 while the indoor fan (shown in the drawing). The heat is exchanged with the indoor air to release heat into the room and condense it. The condensed and liquefied liquid refrigerant is depressurized through the decompressor 6 and the capillary tube 5 ′, becomes a low-temperature low-pressure gas-liquid two-phase, and flows through the outdoor heat exchanger 3 by an outdoor fan (not shown). Heat is absorbed from the sent air and becomes a low-temperature low-pressure gas refrigerant, which is returned from the four-way valve 2 to the compressor 1. During the cooling operation, the operation is the same as that of the heating except that the operation of the outdoor and indoor heat exchangers 3 and 7 is reversed by switching the four-way valve 2.

However, since the capillary tube 5 'as a throttle mechanism has a fixed throttle amount, for example, at the start of heating operation, the gas refrigerant circulates first, so that the return of the liquid refrigerant is small and the circulation amount is small. The heating capacity also did not rise immediately, and had a problem that it took time to warm the room.

[0005]

In the present invention, in consideration of the above problems, the return of the liquid refrigerant at the start of the heating operation is increased, the circulation amount is increased, the heat exchange rate is improved, and the warming time of the room is increased. It is intended to provide a refrigeration cycle.

[0006]

SUMMARY OF THE INVENTION The present invention has been made to solve the above problems, and has a compressor, a four-way valve, an outdoor heat exchanger, a pressure reducer, and an indoor heat exchanger. In a refrigeration cycle in which these are connected by a refrigerant pipe, a parallel circuit of a check valve and a throttle valve is provided between the outdoor heat exchanger and the decompressor, and a pipe of the indoor heat exchanger is provided. A temperature sensor for detecting the temperature was provided, and the throttle valve was fully opened at the start of the heating operation, and when the pipe temperature detected by the temperature sensor reached a set temperature, the throttle valve was throttled to a predetermined amount. . Further, the throttle valve is constituted by a solenoid valve with a hole in which the throttle amount can be varied.

[0007]

DESCRIPTION OF THE PREFERRED EMBODIMENTS In a refrigeration cycle comprising a compressor, a four-way valve, an outdoor heat exchanger, a pressure reducer, and an indoor heat exchanger, these are connected by refrigerant piping. A parallel circuit of a check valve and a throttle valve is provided between the outer heat exchanger and the pressure reducer, and a temperature sensor for detecting a pipe temperature of the indoor heat exchanger is provided, and when the heating operation is started, the throttle valve is fully opened. When the pipe temperature detected by the temperature sensor reaches a set temperature, the throttle valve is throttled to a predetermined amount, thereby increasing the return of the liquid refrigerant at the start of the heating operation and increasing the circulation amount. This results in a refrigeration cycle that improves the heat exchange rate and accelerates the warming time of the room.

[0008]

Embodiments of the present invention will be described below in detail with reference to the accompanying drawings. In FIG. 1, 1 is a compressor, 2
Is a four-way valve; 3, an outdoor heat exchanger; 4, a check valve; , 6 is a decompressor, 7 is an indoor heat exchanger, these are connected by a refrigerant pipe to form a refrigeration cycle. During the heating operation, the refrigerant circulates as shown by the solid arrow, and during the cooling operation, The refrigerant circulates as indicated by the arrow in the broken line. Reference numeral 8 denotes a temperature sensor provided in the indoor heat exchanger 7 for detecting a pipe temperature.

[0009] Of the equipment constituting these refrigeration cycles,
Although not shown, the compressor 1, the four-way valve 2, and the holed solenoid valve 5 are controlled by a control microcomputer. When the heating operation is started, the holed solenoid valve 5 is fully opened and the room is opened. Is controlled so as to be reduced to a predetermined amount when the temperature detected by the temperature sensor 8 provided in the pipe of the indoor heat exchanger 7 reaches a set temperature (about 39 ° C. or higher). I have.

In the above refrigeration cycle, during the heating operation, the high-temperature and high-pressure gas refrigerant discharged from the compressor 1 in the outdoor unit passes through the four-way valve 2 and then passes through the indoor heat exchanger 7.
During the flow, heat is exchanged with indoor air by an indoor fan (not shown) to release heat into the room and condense it. The condensed and liquefied liquid refrigerant is supplied to a decompressor 6, a solenoid valve 5 with holes,
Through the outside heat exchanger 3, the heat is absorbed by air sent by an outdoor fan (not shown), and becomes a low-temperature and low-pressure gas refrigerant. Is returned to the compressor 1. During the cooling operation, the operation is the same as that of the heating except that the operation of the outdoor and indoor heat exchangers 3 and 7 is reversed by switching the four-way valve 2.

With the above arrangement, when the heating operation is started, the solenoid valve 5 with holes is fully opened, so that the return of the liquid refrigerant returning from the indoor heat exchanger 7 is increased, the circulation amount is increased, and the heat exchange rate is improved. , Can speed up the warming time of the room.
When the temperature of the room rises and the temperature detected by the temperature sensor 8 provided on the pipe of the indoor heat exchanger 7 reaches a set temperature, the holed solenoid valve 5 is throttled to a predetermined amount. It was configured to operate normally.

[0012]

As described above, according to the present invention, there is provided a refrigeration cycle in which the return of the liquid refrigerant is increased at the start of the heating operation, the amount of circulation is increased, the heat exchange rate is improved, and the warming time of the room is increased.

[Brief description of the drawings]

FIG. 1 is a diagram showing an embodiment of a refrigeration cycle according to the present invention.

FIG. 2 is a diagram showing a refrigeration cycle according to a conventional example.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Compressor 2 Four-way valve 3 Outdoor heat exchanger 4 Check valve 5 Solenoid valve with a hole (throttle valve) 6 Pressure reducer 7 Indoor heat exchanger 8 Temperature sensor

Claims (2)

[Claims] 1. A refrigeration cycle comprising a compressor, a four-way valve, an outdoor heat exchanger, a decompressor, and an indoor heat exchanger, wherein these are connected by refrigerant piping. A parallel circuit of a check valve and a throttle valve is provided between the exchanger and the decompressor, and a temperature sensor for detecting a pipe temperature of the indoor heat exchanger is provided.When the heating operation is started, the throttle valve is fully opened, A refrigeration cycle wherein the throttle valve is throttled to a predetermined amount when a pipe temperature detected by a temperature sensor reaches a set temperature. 2. The refrigeration cycle according to claim 1, wherein said throttle valve is constituted by a solenoid valve with a hole capable of changing a throttle amount.