JPS62142964A - heating device - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to improving the performance of heat pump type heating devices.

BACKGROUND OF THE INVENTION Conventional heat pump heating systems have had the disadvantage that the evaporation temperature of the refrigerant decreases as the outside air temperature 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, the compressor 1. Condenser 2, pressure reducing device 3. The liquefied refrigerant in the heating main circulation circuit consisting of the evaporator 4 is sent to the liquid receiver 5 via the first check valve 6, and when the control on-off valve 7 is opened or closed, that is, when the control on-off valve 7 is open, the liquid refrigerant is sent to the liquid receiver 5 through the first check valve 6. The liquid refrigerant accumulated in the liquid refrigerant 5 is supplied by gravity to the heater 9 through the second reverse valve 8. At this time, since the liquid receiver 5 and the heater 9 are pressure equalized, The liquid refrigerant flows into the liquid receiver 5 from the heating main circulation circuit by the valve 6. When the liquid refrigerant in the liquid receiver 5 runs out, the control on-off valve 7 is closed, and the liquid refrigerant flows into the liquid receiver 5 from the heating main circulation circuit. The refrigerant is caused to flow through the first check valve 6 (at this time, the heater pressure is higher than the liquid receiver pressure, so the liquid refrigerant flowing into the liquid receiver 5 is caused to flow into the heater 9 by the second check valve 8). do not have.)
When the liquid refrigerant accumulates in the liquid receiver 5, the control valve 7 is opened again to supply the liquid refrigerant to the heater 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 as shown in FIG. The refrigerant that has been endothermically gasified by the heater 9 passes through the control on-off valve 7 and flows into the liquid receiver 5, and the temperature of the liquid receiver 5 rises. When liquid refrigerant flows into the liquid receiver 5 through the valve 6, the volume of the gas part of the liquid receiver 5 is compressed due to the increase in the liquid part, and the amount of liquid refrigerant flowing into the liquid receiver 5 decreases. As a result, the amount of liquid refrigerant in the heater 9 was insufficient, the temperature of the refrigerant gas in the heater 9 rose, 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 pressure side of the heating main circulation circuit. (For example, JP-A-60-9323
Publication No. 7) The refrigerant circuit had m points while becoming complicated.

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

Means for Solving the Problems In order to solve the above problems, the heating device of the present invention includes a compressor, an accumulator, a condenser, and a pressure reducing device.

a heat pump cycle consisting of an evaporator; a liquid receiver connected from the high-pressure liquid section of the heat pump cycle via a first reverse valve; and a gas-liquid separation unit connected below the liquid receiver via a second check valve. A gas return pipe from the gas-liquid separator is connected to the discharge pipe of the compressor, and a pressure equalization pipe having an on-off valve is connected to the liquid receiver, and the liquid pipe and return pipe of the gas-liquid separator are heated with refrigerant. One of the containers is the accumulator and the other is the liquid receiver, and the accumulator and the liquid receiver are integrated.

Function The present invention has the above-described structure, and the liquid receiver is integrated with the accumulator, which is the low-pressure part of the heat pump cycle, via the partition plate, so due to the heat transfer effect, when the on-off valve is open, inflow from the gas-liquid separator is prevented. When the on-off valve closes, the high-pressure liquid refrigerant on the heat pump cycle side flows smoothly into the liquid receiver, and as a result, the gas-liquid separator has the effect of condensing the liquid refrigerant from the liquid receiver to the liquid receiver. Since there is no shortage of 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 an accumulator that is integrated with a liquid receiver 15 by a partition plate 16,
It constitutes a heat pump cycle. 17 is a first check valve disposed in a pipe connecting the liquid receiver 15 and the heat pump cycle high-pressure liquid section; 18 is a gas-liquid separator disposed below the liquid receiver 15; , and is connected to the liquid receiver 15 via a second check valve 19. 20 is a gas return pipe that connects the gas-liquid separator 18 and the discharge pipe of the compressor 1, and 21 is installed in a pressure equalization pipe 22 that connects the gas-liquid separator 18 and the liquid receiver 15. The on-off valves 23 and 24 are connected to the refrigerant heater 25 through a liquid pipe and a return pipe, respectively, which are disposed in the gas-liquid separator 18.

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, when the on-off valve 21 is closed, the liquid refrigerant branched from the high-pressure liquid part of the heat pump cycle flows through the first check valve 17.
The liquid passes through and accumulates in the liquid receiver 15. At this time, since the pressure in the gas-liquid separator 18 is higher than the pressure in the liquid receiver 15, the second check valve 19
Therefore, the liquid refrigerant flowing into the liquid receiver 15 does not flow into the gas-liquid separator 18. Next, when the liquid refrigerant accumulates in the liquid receiver 15, 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 becomes equal to the pressure in the liquid receiver 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, merges with the discharge gas of the compressor 10, and flows into the condenser 11. Further, the liquid refrigerant that has returned to the gas-liquid molecular a device 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 is intermittently supplied from the high-pressure liquid section to the gas-liquid separator 18 and the refrigerant heater 25. By performing a two-phase natural circulation cycle, the gas refrigerant that has been endothermically evaporated in the refrigerant heater 25 is combined with the discharge gas of the compressor 1 and conveyed to the condenser 2. In order to absorb heat from the refrigerant heater 25 in a two-phase state without thermally decomposing the refrigerant, it is necessary to smoothly store the liquid refrigerant in the liquid receiver 15ζ. Since the accumulator 14 on the low pressure side and the liquid receiver 15 are integrated through 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 contacts the low-temperature part of the accumulator 14 and condenses, and when the on-off valve 21 is closed, the high-pressure liquid refrigerant compresses the volume of the gas part of the liquid receiver 15 when flowing. The liquid refrigerant smoothly accumulates in the liquid receiver 15 from the heat pump cycle side without any problems. Therefore, receiver 1
5 to the gas-liquid separator 18, and as a result, thermal decomposition of the refrigerant in the refrigerant heater 25 is prevented, cycle reliability is improved, and the equipment can be made more compact. be.

Effects of the Invention As described above, according to the heating device of the present invention, since the accumulator of the heat pump cycle and the liquid receiver are integrated, when supplying liquid refrigerant from the liquid receiver to the gas-liquid separator, the pressure equalizing pipe is used. The gas refrigerant flowing from the gas-liquid separator to the liquid receiver is condensed in the low-temperature part of the accumulator, and when the high-pressure liquid refrigerant flows into the heat pump cycle, the volume of the gas part of the liquid receiver decreases. Preventing pressure rise in the liquid receiver, the flow of liquid refrigerant into the liquid receiver becomes smooth, and as a result, refrigerant thermal decomposition in the refrigerant heater can be performed without running out of liquid refrigerant supply from the liquid receiver to the gas-liquid separator. This can improve the reliability of the system, make the equipment more compact, and provide a comfortable heating system that is less affected by outside temperature.

[Brief explanation of drawings]

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, 1
2... Pressure reducing device, 13... Evaporator, 1
4... Accumulator, 15... Liquid receiver, 16... Partition plate, 17... First check valve, 18...・Gas-liquid separator, 19...
...Second check valve, 20...Gas return pipe, 21.
...Opening/closing valve, 22...Pressure equalization pipe, 25...
...Refrigerant heater. Name of agent: Patent attorney Toshio Nakao and one other person IQ
---L Shimakaze/J-11 hairless device/4---7 Kiyu AI/-Talσ-Shiho each 2nd figure

Claims (1)

[Claims] It has a heat pump cycle consisting of 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, and a liquid receiver below the liquid receiver. A gas-liquid separator connected 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 a gas-liquid separator are connected to a refrigerant heater, and in which two spaces are formed by a partition plate, one of which is the accumulator and the other is the liquid receiver.