JPH0566502B2 - - 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 ART Conventional heat pump heating devices have had the disadvantage that as the outside air temperature decreases, the evaporation temperature of the refrigerant decreases, resulting in a decrease in the amount of refrigerant circulated to the condenser and a decrease in heating capacity. In order to compensate for this decrease in heating capacity, as shown in FIG. By opening and closing the control valve 7, that is, when the control valve 7 is open, the liquid refrigerant accumulated in the liquid receiver 5 is sent to the heater 9 through the second check valve 8 by gravity. At this time, since the liquid receiver 5 and the heater 9 are pressure-equalized, the first check valve 6 prevents liquid refrigerant from flowing into the liquid receiver 5 from the heating main circulation circuit. When the liquid refrigerant in the heater 5 runs out, the control on-off valve 7 is closed, and the liquid refrigerant flows into the receiver 5 from the heating main circulation circuit through the first check valve 6 (at this time, the heater pressure is equal to (Since the liquid refrigerant flowing into the liquid receiver 5 is higher than the pressure, it does not flow into the heater 9 by the second check valve 8.) When the liquid refrigerant accumulates in the liquid receiver 5, the control opening/closing valve 7 is opened again and the heater is turned off. Supply liquid refrigerant to 9. In other words, the liquid refrigerant is intermittently supplied to the heater 9 from the liquid receiver 5, and the refrigerant gas that has absorbed heat and evaporated in the heater 9 is sent to the condenser 2 together with the discharge gas of the compressor 1 to improve the condensation capacity at low outside temperatures. Efforts are being made to prevent this decline.
(For example, Japanese Unexamined Patent Publication No. 60-89627) Problems to be Solved by the Invention However, in the configuration shown in FIG. The refrigerant that has been endothermically gasified by the heater 9 flows through the control on-off valve 7 into the liquid receiver 5, and the temperature of the liquid receiver 5 rises. When the liquid refrigerant flows into the liquid receiver 5 through the stop valve 6, the gas portion volume of the liquid receiver 5 is compressed due to the increase in the liquid portion, and the amount of liquid refrigerant flowing into the liquid receiver 5 decreases. As a result, there was a problem in that the amount of liquid refrigerant in the heater 9 was insufficient, the temperature of the refrigerant gas in the heater 9 increased, and the thermal stability of the refrigerant was impaired. Furthermore, in order to smoothly flow the liquid refrigerant at the outlet of the condenser 2 of the heating main circulation circuit into the liquid receiver 5, there is a method in which the gas refrigerant in the liquid receiver 5 is released to the low pressure side of the heating main circulation circuit. (For example, Japanese Patent Application Laid-Open No. 60-93237) had the problem that the refrigerant circuit was complicated.

The present invention is intended to solve these conventional problems, and aims to improve the reliability of the device and make the device more compact.

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 accumulator, a condenser, a pressure reducing device, and an evaporator;
A liquid receiver connected to the high-pressure liquid part of the heat pump cycle via a first check valve; a gas-liquid separator connected below the liquid receiver via a second check valve; a cycle in which a return pipe is connected to a discharge pipe of the compressor, a pressure equalizing pipe having an on-off valve is connected to the liquid receiver, and a liquid pipe and a return pipe of the gas-liquid separator are connected to a refrigerant heater; One of the containers forming two spaces by a partition plate is the accumulator, and the other is the liquid receiver, and the accumulator and the liquid receiver are integrated.

Effects In the present invention, the liquid receiver is integrated with the accumulator, which is the low-pressure part of the heat pump cycle, through the partition plate. When the on-off valve closes, the high-pressure liquid refrigerant on the heat pump cycle side smoothly flows into the liquid receiver, and as a result, the gas-liquid separator has the effect of condensing the gas refrigerant from the liquid receiver. Since there is no shortage of liquid refrigerant and there is no shortage of liquid refrigerant supplied to the refrigerant heater, the refrigerant does not undergo thermal decomposition, improving cycle reliability and making equipment more compact.

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

In FIG. 1, 10 is a compressor, 11 is a condenser, 12 is a pressure reducing device, 13 is an evaporator, 14 is a partition plate, and 16 is an accumulator that is integrated with a liquid receiver 15, and a heat pump cycle is performed. It consists of 17 is a first check valve installed in a pipe connecting the liquid receiver 15 and the high-pressure liquid section of the heat pump cycle; 18 is a gas-liquid separator installed below the liquid receiver 15; , and is connected to the liquid receiver 15 via a second check valve 19. 20
21 is a gas return pipe connecting the gas-liquid separator 18 and the discharge pipe of the compressor 1, and 21 is the gas-liquid separator 1.
Opening/closing valves 23 and 24 are installed in the pressure equalizing pipe 22 that connects the liquid receiver 15 and the liquid receiver 15. It is connected.

In the above configuration, the refrigerant that has become high temperature and high pressure in the compressor 10 is condensed and liquefied in the condenser 11, expanded under reduced pressure in the pressure reducing device 12, gasified in the evaporator 13, and returned to the compressor 9 through the accumulator 14. On the other hand, the liquid refrigerant separated from the high-pressure liquid part of the heat pump cycle passes through the first check valve 17 and accumulates in the liquid receiver 15 when the on-off valve 21 is closed. At this time, the pressure in the gas-liquid separator 18 is higher than the pressure in the liquid receiver 15, so the second check valve 1
9 prevents the liquid refrigerant flowing into the liquid receiver 15 from flowing into the gas-liquid separator 18. Next, when the liquid refrigerant in the liquid receiver 15 accumulates, the on-off valve 21 is opened and the pressure in the liquid receiver 15 becomes equal to the pressure in the gas-liquid separator 18 through the pressure equalization pipe 22, and the gas-liquid separator 18 Since the liquid refrigerant is disposed below the liquid receiver 15, the liquid refrigerant accumulated in the liquid receiver 15 flows into the gas-liquid separator 18 due to gravity. At this time, the pressure in the liquid receiver 15 is equal to the pressure in the gas-liquid separator 18, so the first check valve 17 is closed, and liquid refrigerant does not flow into the liquid receiver 15 from the high-pressure liquid section of the heat pump cycle. The liquid refrigerant that has flowed into the gas-liquid separator 18 flows through the liquid pipe 23 into the refrigerant heater 25 through natural circulation, absorbs heat, evaporates, passes through the return pipe 24 in a two-phase state, returns to the gas-liquid separator 18, and only the gas refrigerant becomes a gas. It passes through the return pipe 20 and joins the discharge gas of the compressor 10 to the condenser 11
flow into. Further, the liquid refrigerant that has returned to the gas-liquid separator 18 through the return pipe 24 in a two-phase state flows into the refrigerant heater 25 again. As described above, by opening and closing the on-off valve 21, the liquid refrigerant accumulated in the liquid receiver 15 from the high-pressure liquid section of the heat pump cycle is intermittently supplied to the gas-liquid separator 18. By performing a phase natural circulation cycle, the gas refrigerant that has been continuously endothermically evaporated in the refrigerant heater 25 is combined with the discharge gas of the compressor 1 and conveyed to the condenser 2. Here, in order to absorb heat from the refrigerant heater 25 in a two-phase state without thermal decomposition of the refrigerant, it is necessary to smoothly store the liquid refrigerant in the liquid receiver 15, but in this embodiment, the heat pump cycle Accumulator 14 on the low pressure side
Since the liquid receiver 15 is integrated with the liquid receiver 15 via the partition plate 16, when the on-off valve 21 is opened, the gas refrigerant flowing from the gas-liquid separator 18 through the pressure equalization pipe 22 comes into contact with the low temperature part of the accumulator 14 and condenses. On-off valve 21
When closed, the high-pressure liquid refrigerant flows into the liquid receiver 15 without compressing the gas section volume, and the liquid refrigerant smoothly accumulates in the liquid receiver 15 from the heat pump cycle side. Therefore, the amount of refrigerant supplied from the liquid receiver 15 to the gas-liquid separator 18 is not insufficient, and as a result, the refrigerant heater 25
This has the effect of preventing thermal decomposition of the refrigerant in the air, improving cycle reliability and making equipment more compact.

Effects of the Invention As described above, according to the heating device of the present invention, the accumulator of the heat pump cycle and the liquid receiver are integrated, so when supplying liquid refrigerant from the liquid receiver to the gas-liquid separator, the pressure equalizing pipe is used. The gas refrigerant that flows from the gas-liquid separator to the liquid receiver is condensed in the low temperature section of the accumulator, and when the heat pump cycle high-pressure liquid refrigerant flows into the liquid receiver, the gas refrigerant that flows into the liquid receiver from the gas liquid separator is condensed. Prevents pressure rise in the liquid container and allows smooth flow of liquid refrigerant into the liquid receiver.As a result, there is no shortage of liquid refrigerant supplied from the liquid receiver to the gas-liquid separator, and refrigerant thermal decomposition in the refrigerant heater is prevented. This improves the reliability of the system, makes the equipment more compact, and provides a comfortable heating system that is less affected by outside temperature.

[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. 10... Compressor, 11... Condenser, 12... Pressure reducing device, 13... Evaporator, 14... Accumulator, 15... Liquid receiver, 16... Partition plate, 17...
... first check valve, 18 ... gas-liquid separator, 19 ... second check valve, 20 ... gas return pipe, 21 ... on-off valve, 22 ... pressure equalization pipe, 25 ... refrigerant heater.

Claims (1)

[Claims] 1. A heat pump cycle comprising a compressor, an accumulator, a condenser, a pressure reducer, and an evaporator, and a liquid receiver connected from the high-pressure liquid part of the heat pump cycle via a first check valve, below the liquid receiver. a gas-liquid separator connected to the gas-liquid separator via a second check valve, a gas return pipe from the gas-liquid separator connected to the compressor discharge pipe, and a pressure equalization pipe having an on-off valve connected to the liquid receiver, respectively; A heating device comprising a cycle in which a liquid pipe and a return pipe of the gas-liquid separator are connected to a refrigerant heater, and a container forming two spaces with a partition plate, one of which serves as the accumulator and the other as the liquid receiver.