JPS6037378B2 - Refrigerant heating air conditioner - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a slip-heating type air conditioner comprising a refrigeration cycle equipped with a cold soot heater that improves heating capacity when there is low outside air overflow. The cold soot pressure during the cycle is detected, and the degree of cold soot heating is controlled by operating, partially operating, or stopping the cold soot heater according to the cold soot pressure, and the pressure during the refrigeration cycle is reduced by heating the cold soot. The purpose of this is to prevent a phenomenon in which normal refrigerant heating operation cannot be continued due to a sudden increase in refrigerant temperature.

The control of the cold soot heater during the cold soot heating heating operation in the sub-chamber is performed by starting and stopping the compressor in the refrigeration cycle based on the signal from the thermostat that detects the temperature of the indoor intake air installed in the indoor unit. As a result, when the indoor suction air temperature rises, the compressor frequently starts and stops, and the difference in the temperature of the blowing air between when it is running and when it is stopped increases, causing discomfort to the human body and causing problems every time it starts operating. The refrigeration cycle was also unstable due to fluctuations in current and input.

The present invention eliminates the drawbacks seen in the operation control of the cold soot heater of the conventional air conditioner.

The present invention will be described below with reference to the accompanying drawings showing one embodiment thereof.

First, the refrigeration cycle will be explained using diagrams.

In the figure, 1 is a compressor, 2 is a four-way switching valve for switching between cooling operation and heating operation, 3 is an indoor heat exchanger, 4 is a pressure reduction mechanism, and 5 is an outdoor heat exchanger, which are connected in a ring. This creates a heat pump type refrigeration cycle. 6 is a refrigerant heater that heats the return pipe 6a to the compressor 1;
A heat medium 6b such as water, a heat source 6c for heating the heat medium 6b, and the like are disposed in the liner heater 6.

7 is a first pipe connected in series with the return pipe 6a of the cold soot heater 6.
The refrigerant heating circuit formed by connecting the on-off valve 7 and the sleeve heater 6 in series is a series-connected refrigerant heating circuit consisting of a pressure reducing mechanism 4, an outdoor heat exchanger 5, and a four-way sliding door valve 2. connected in parallel to the circuit.

The first on-off valve 7 is opened only during refrigerant heating operation. Reference numeral 8 denotes a second on-off valve that opens only during normal heat pump type heating operation, and check valve 9 is provided between the two divided pressure reducing mechanisms 4 and 4 in a direction to allow refrigerant to flow only during cooling operation. are installed in parallel.

Reference numeral 10 denotes a check valve that is provided in parallel to one of the two divided pressure reducing devices 4, 4, and is provided in a direction that allows the medium to pass during cooling operation.

Reference numeral 11 denotes a third on-off valve, which is provided in a pipe connecting the discharge pipe and suction pipe of the compressor 1, and is opened during refrigerant heating operation.

By opening the third on-off valve 11, the flow rate of refrigerant to the indoor heat exchanger 3 during the side heating operation can be reduced, and the load on the compressor 1 can be reduced. Reference numeral 12 denotes a check valve provided in the suction pipe leading from the four-way switching valve 2 to the compressor 1, and one end of the soot heating circuit is connected between the check valve 12 and the acculator 13.

14 is a pressure detector installed in the cold soot circuit from the four-way switching valve 2 to the indoor heat exchanger 3, which detects the pressure of the cold soot in the refrigerant circuit and outputs an electric signal according to the pressure. It is.

In this embodiment, the heat source 6c is composed of two gas burners, and electromagnetic valves 15 and 16 are provided in the gas supply path to each gas burner. Reference numeral 17 denotes a solenoid valve opening/closing control device, which together with the solenoid valves 15 and 16 form a cold soot heating degree control device, receives a signal from the pressure detector 14 and controls the opening and closing of the solenoid valves 15 and 16. It is something to do.

That is, when the pressure of cold soot detected by the pressure detector 14 is extremely high, both solenoid valves 15 and 16 are closed to stop heating by the gas burner, and when the pressure of the medium is slightly high, both solenoid valves 15 and 16 are closed. Close either one of the valves 15, 16 to reduce the degree of heating by the gas burner, and further, when the cold soot pressure is normal or lower, both the solenoid valves 15,
16 is opened to maximize the heating degree. In the figure, A is an indoor unit, B is an outdoor unit, and C is a soot heater unit.
It may be provided anywhere within. In the above configuration, during cooling operation, the refrigerant discharged from the compressor 1 is transferred to the four-way switching valve 2.
, the outdoor heat exchanger 5, the check valves 10 and 9, one pressure reducing mechanism 4, the indoor heat exchanger 3, the four-way switching valve 2, the check valve 12, and the accumulator 13. The refrigeration cycle returns to the compressor 1. Configure. Also, during heating operation using a normal heat pump system, refrigerant is discharged from the compressor 1 and the four-way switching valve 2
, the indoor heat exchanger 3, one pressure reducing mechanism 4, the second on-off valve 8, the other pressure reducing mechanism 4, the outdoor heat exchanger 5, the four-way switching valve 2, the check valve 12, and the accumulator 13 for compression. A refrigeration cycle returning to machine 1 is constructed. Next, when performing a soot heating operation using the refrigerant heater 6, the cold soot is transferred to the compressor 1, the four-way switching valve 2, the indoor heat exchanger 3, and the first on-off valve 7.
One cycle includes a refrigeration cycle that passes through the soot heater 6 and returns to the compressor 1 through the accumulator 13, and a refrigeration cycle that returns from the compressor 1 to the compressor 1 through the third on-off valve 11 and the accumulator 13. Configure. In addition, in the case of cold soot heating heating operation, the second on-off valve 8 is closed, so that the soot does not pass through the outdoor heat exchanger 5. In other words, during the cold soot heating operation using the refrigerant heater 6, the first
The on-off valve 7 is opened, the second on-off valve 8 is closed, and the third on-off valve 11 is opened, and a refrigeration cycle is used that prevents cold soot from flowing into the outdoor heat exchanger 5. The refrigerant discharged from the machine 1 exchanges heat with the indoor air in the indoor heat exchanger 3, and then flows into the refrigerant heater 6, absorbs heat from the heating source 6c into the cold soot, and is compressed. Machine 1
Configure the refrigeration cycle to return to. Furthermore, when controlling the cold soot heating heating operation using the refrigerant heater 6, the soot pressure in the cold soot circuit is detected by the pressure detector 14, and the on-off valve is controlled via the solenoid valve opening/closing control device 17. By opening and closing 15 and 16, operation, partial operation, and stoppage of the cold soot heater 6 is controlled according to the magnitude of the pressure in the refrigeration cycle, and the state of the cold soot sucked into the compressor 1 is controlled. It stabilizes the temperature and prevents a sudden rise in pressure during the refrigeration cycle, allowing normal cold soot heating and heating operation. In addition, during cold soot heating operation, if the third on-off valve 11 is not present, the soot will not flow through the pressure reducing mechanism, so the pressure difference between the high pressure side and the low pressure side of the compressor 1 will be reduced, resulting in an excessive amount of refrigerant circulation. The soot medium discharged from the soot heater 6 is not completely gasified and returns to the compressor 1 in a liquid state. The soot flows in a gaseous state through the third on-off valve 11 to the suction side of the compressor 1, so that the soot that has left the refrigerant heater 6 is completely gasified and is sucked into the compressor 1 in a gaseous state. . Furthermore, compressor 1
The pressure difference between the high-pressure side and the low-pressure side of the refrigerant is further reduced than when no refrigerant flows through the pressure reducing mechanism, thereby reducing the electrical input. In the above description of the embodiment, a gas burner was used as the heating source 6c, and the solenoid valves 15 and 16 and the solenoid valve opening/closing control device 17 were used as the soot heating degree control device. and solenoid valve 15,1
6 may be integrated into one, and the relationship of the solenoid valve may be controlled by a solenoid valve opening/closing control device.

Alternatively, an electric heater may be used as the heating source 6c, and a device that controls the amount of power supplied to the electric heater may be used as the cold soot heating degree control device. Further, the heating source 6c may be a kerosene combustion section, and a kerosene supply amount control device may be used as the cold soot heating degree control device. Note that the pressure detector 14 may detect and output the cold soot pressure stepwise or continuously. As is clear from the above embodiments, the present invention is configured to bypass not only the outdoor heat exchanger but also the pressure reduction mechanism when performing heating operation using the cold soot heater, so that the input to the compressor can be reduced. I can do it. At this time, the third on-off valve is opened to separate the discharge side and suction side of the compressor, thereby reducing the amount of refrigerant circulation, and by guiding the discharge gas to the suction side, the refrigerant gas on the suction side of the compressor is It is possible to prevent liquid compression in the compressor. Furthermore, since the degree of heating of the cold soot by the cold soot heater is controlled by the magnitude of the refrigerant pressure in the refrigeration cycle, it has excellent effects such as less pressure fluctuation during the refrigeration cycle and a stable cycle.

[Brief explanation of the drawing]

The figure is a refrigeration cycle diagram of a refrigerant heating type air conditioner according to an embodiment of the present invention. 1... Compressor, 2... Four-way switching valve, 3
... Indoor heat exchanger, 4 ... Pressure reduction mechanism, 5
... Outdoor heat exchanger, 6 ... Refrigerant heater, 7 ... First on-off valve, 8 ... Second
On-off valve, 11...Third on-off valve, 12...
・Check valve, 14...Pressure detector, 15, 16, 17...
...Cold soot heating degree control device.

Claims (1)

[Claims] 1 Compressor, four-way switching valve, indoor heat exchanger, pressure reduction mechanism,
An outdoor heat exchanger is connected to constitute a refrigeration cycle, and a first on-off valve and a refrigerant heater for heating the refrigerant are provided in parallel in a series circuit of the pressure reduction mechanism and the outdoor heat exchanger, and the pressure reduction A second on-off valve is provided between the mechanism and the outdoor heat exchanger, a third on-off valve is provided by bypassing the high pressure side piping and the low pressure side piping of the compressor, and the refrigerant pressure is detected in the refrigerant circulation circuit. A pressure sensor is provided, and during refrigerant heating operation, the first on-off valve and the third on-off valve are opened, the second on-off valve is closed, and the output from the pressure sensor is output according to the refrigerant pressure. A refrigerant heating type air conditioner configured to control the heating degree of the refrigerant heater based on the received refrigerant heater.