JPH058348B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to improving the performance of a heat pump type heating device.

BACKGROUND TECHNOLOGY Conventional heat pump heating devices have had the disadvantage that as the temperature decreases, the evaporation temperature of the refrigerant decreases, resulting in a shortage of refrigerant flow rate in the indoor heat exchanger and a decrease in heating capacity. In order to compensate for this decrease in heating capacity, as shown in FIG. send to
The controlled opening/closing valve 7 sends the liquid refrigerant in the liquid receiver 6 to the heater 8 by gravity, and returns the gasified refrigerant to the discharge pipe of the compressor 1, thereby improving the condensing capacity. (For example, Japanese Patent Application Laid-Open No. 60-89627) Problems to be Solved by the Invention However, in the configuration shown in Fig. 2, the condenser 2
Most of the condensed and liquefied refrigerant flows toward the evaporator 4 due to the suction action of the compressor 1, but does not flow toward the receiver 6, which has almost no pressure difference from the outlet of the condenser 2, and as a result, the refrigerant flows into the generator 8. The problem was that the amount of liquid refrigerant was insufficient, and the refrigerant thermally decomposed, reducing cycle reliability.

The present invention solves such conventional problems,
The purpose is to improve the reliability of equipment.

Means for Solving the Problems In order to solve the above problems, the heating device of the present invention includes a heat pump cycle consisting of a compressor, an indoor heat exchanger, a pressure reduction device, and an outdoor heat exchanger, and a high-pressure liquid in the heat pump cycle. a liquid receiver disposed in a heat exchange relationship with the low pressure part of the heat pump cycle through a first check valve; and a liquid receiver connected to the liquid receiver below the liquid receiver via a second check valve. A gas-liquid separator that connects a gas return pipe to the discharge pipe of the compressor and is provided with a pressure equalizing pipe having the liquid receiver and an on-off valve, and connects the liquid pipe and return pipe of the gas-liquid separator to a refrigerant heater. It has the following configuration.

Effects According to the present invention, the liquid receiver is arranged in a heat exchange relationship with the low-pressure part of the heat pump cycle due to the above-described configuration, so that the liquid receiver is cooled and the liquid receiver is transferred from the high-pressure liquid part of the heat pump cycle to the liquid receiver. High-pressure liquid refrigerant can easily flow into the gas-liquid separator, and by opening the on-off valve of the pressure equalizing pipe connecting the liquid receiver and the gas-liquid separator, the head difference can be maintained. Since there is no shortage of refrigerant supplied from the liquid pipe of the gas-liquid separator to the refrigerant heater, the refrigerant does not thermally decompose in the refrigerant heater, improving cycle reliability. can get.

Embodiments Hereinafter, embodiments of the present invention will be described based on the accompanying drawings.

In FIG. 1, 9 is a compressor, 10 is an indoor heat exchanger, 11 is a pressure reducing device, 12 is an outdoor heat exchanger, 1
3 is an accumulator and constitutes a heat pump cycle. 14 is a heat exchanger disposed in the low pressure part of the heat pump cycle and exchanges heat with a liquid receiver 16 connected to the high pressure liquid part of the heat pump cycle via the first check valve 15; 17 is a second heat exchanger; A gas-liquid separator 19 is disposed below the liquid receiver via a check valve 18 and is disposed in a pressure equalizing pipe 20 that connects the liquid receiver 16 and the gas-liquid separator 17. An on-off valve 21 is a gas return pipe 2 that guides the gas refrigerant of the gas-liquid separator to the discharge pipe of the compressor 9;
Reference numerals 2 and 23 denote a liquid pipe and a return pipe respectively arranged in the gas-liquid separator and connected to the refrigerant heater 24.

In the above configuration, the refrigerant that has become high temperature and high pressure in the compressor 9 is condensed and liquefied in the indoor heat exchanger 10, depressurized and expanded in the pressure reducing device 11, evaporated and gasified in the outdoor heat exchanger 12, and passed through the accumulator 13 to the compressor 9. return. On the other hand, the liquid refrigerant separated from the high-pressure liquid section of the heat pump cycle flows through the first check valve 15 into the liquid receiver 16 which is in a heat exchange relationship with the low-pressure section of the heat pump cycle and is cooled. At this time, when the on-off valve 19 provided in the pressure equalization pipe 20 is closed, the liquid refrigerant that has flowed in is collected in the liquid receiver 16.
When the on-off valve 19 is opened, the liquid refrigerant accumulated in the liquid receiver 16 passes through the second check valve 18 to the gas-liquid separator 17 disposed below the liquid receiver 16, and is separated by a head difference. Inflow. The liquid refrigerant that has flowed into the gas-liquid separator 17 flows from the liquid pipe 22 into the refrigerant heater 24, where it absorbs heat and evaporates, passes through the return pipe 23, returns to the gas-liquid separator 24, and only the gas refrigerant passes through the gas return pipe 21 and is compressed. The gas is combined with the discharge gas of the heat exchanger 9, flows into the indoor heat exchanger 10, and repeats the same cycle. Here, since the refrigerant state at the outlet of the refrigerant heater 24 is always guaranteed to be a two-phase state, the liquid refrigerant that is partially evaporated in the gas-liquid separator 17 flows into the refrigerant heater 24 from the liquid pipe 22 again. Then, when the liquid level in the gas-liquid separator 17 decreases, the on-off valve 19 is opened to supply the liquid refrigerant accumulated in the liquid receiver 16 to the gas-liquid separator 17, and during the supply, the first non-return check is performed. The valve 15 prevents high pressure liquid refrigerant from flowing into the receiver 16 from the heat pump cycle. When the liquid refrigerant stored in the liquid receiver 16 finishes being supplied to the gas-liquid separator 17, the on-off valve 19 closes and the high-pressure liquid refrigerant flows into the liquid receiver 16 again from the heat pump cycle, and this process is repeated to separate the gas and liquid. An appropriate amount of refrigerant is always guaranteed to be supplied to the container 17. Therefore, in order to always guarantee an appropriate amount of refrigerant to the gas-liquid separator 17 and prevent thermal decomposition of the refrigerant, it is necessary to
Although it is necessary to flow the high-pressure liquid refrigerant of the heat pump cycle into 6, in this embodiment, the low-pressure part of the heat pump cycle and the liquid receiver 16 are arranged in a heat exchange relationship to cool the liquid receiver 16. This is possible and increases cycle reliability. Note that the indoor heat exchanger 10 does not necessarily need to be used for air conditioning, and may be used for hot water supply as a refrigerant-water heat exchanger.

Effects of the Invention As described above, according to the heating device of the present invention, since the low pressure part of the heat pump cycle and the liquid receiver are arranged in a heat exchange relationship, the liquid receiver is cooled and the high pressure liquid refrigerant of the heat pump cycle is cooled. This makes it easier for the liquid refrigerant to flow into the liquid receiver, and as a result, the liquid refrigerant is smoothly supplied to the gas-liquid separator, preventing thermal decomposition of the refrigerant in the refrigerant heater, and improving system reliability. A comfortable heating system with little influence can be obtained.

[Brief explanation of the drawing]

FIG. 1 is a circuit diagram of a heating device according to an embodiment of the present invention, and FIG. 2 is a circuit diagram of a conventional heating device. 9...Compressor, 10...Indoor heat exchanger, 11...
... Pressure reduction device, 12 ... Outdoor heat exchanger, 15 ... First check valve, 16 ... Liquid receiver, 17 ... Gas-liquid separator, 18 ... Second check valve, 19 ... Opening/closing valve , 20
... pressure equalization pipe, 21 ... gas return pipe, 22 ... liquid pipe, 23 ... return pipe, 24 ... refrigerant heater.

Claims (1)

[Claims] 1. A heat pump cycle consisting of a compressor, an indoor heat exchanger, a pressure reducer, and an outdoor heat exchanger, and a high-pressure liquid section of the heat pump cycle arranged in a heat exchange relationship with the low-pressure section of the heat pump cycle via a first check valve. A liquid receiver is connected to the lower part of the liquid receiver through a second check valve, and a gas return pipe is connected to a discharge pipe of the compressor, and a shut-off valve is connected to the liquid receiver. A heating device comprising a gas-liquid separator provided with a pressure equalizing pipe having a pressure equalizing pipe, and a cycle in which the liquid pipe and return pipe of the gas-liquid separator are connected to a refrigerant heater.