JPS6033221B2 - Air conditioner operation control device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an operation control device for an air conditioner comprising a heat pump refrigeration cycle equipped with a cold soot heater that improves heating capacity at low outside temperatures, and particularly relates to The purpose is to quickly obtain effective heating operation with a stable refrigeration cycle by removing the refrigerant accumulated in the outdoor heat exchanger after operation of the cold soot heater.

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will now be described in detail with reference to FIG.
This will be explained with reference to FIG.

In the figure, 1 is a compressor, 2 is a four-way switching valve, 3 is an indoor heat exchanger, 4 is a pressure reducer, 5 is a first on-off valve, 6 is an outdoor heat exchanger, and 7 is a second on-off valve. , a well-known refrigeration cycle is constructed by connecting these in a ring.

8 is a third on-off valve that constitutes a bypass circuit; 9 is a cold soot heater that heats the return pipe of the compressor 1; inside this soot heater 9, there is a heat medium 10 such as water and the heat medium 10
Heaters 11 and the like are provided for heating the respective parts.

12 is a thermostat that detects the outside temperature; 13 is a pressure switch that detects the pressure on the outdoor heat exchanger 6 side; and 14 is a relay that is energized by the thermostat 12. Here, the first, second and third on-off valves 5, 7,
8, heater 11, thermostat 12, pressure switch 13, and relay 14 are connected as shown in FIG. Reference numeral 15 denotes a thermal timer switch, which, as is well known, is composed of a heater 5a and a switch 15b, which are connected as shown in FIG.

In the above configuration, during cooling operation, the cold soot discharged from the compressor 1 is transferred to the four-way sliding door valve 2, the outdoor heat exchanger 6, and the pressure reducer 4.
, an indoor heat exchanger 3 , a four-way switching valve 2 , and a cold soot heater 9 to form a refrigeration cycle that returns to the compressor 1 .

In addition, during normal heating operation, the cold soot discharged from the compressor 1 is transferred to the four-way switching valve 2, the indoor heat exchanger 3, the pressure reducer 4, the outdoor heat exchanger 6, the four-way switching valve 2, and the cold soot heater 9. This constitutes a refrigeration cycle that returns to the compressor 1. Next, when the outside temperature drops further during heating operation, the outside air thermostat 12 is activated.
Electricity is applied to the timer switch 15, heater 1, and pressure switch 13, respectively.

Then, the heater 5a of the timer switch 15 is heated, and after a predetermined period of time, the switch 15b is turned on.
The on-off valve 5 is closed, and the cold soot inside the outdoor heat exchanger 6 is removed. The pressure switch 13 detects this, and when the pressure inside the outdoor heat exchanger 6 reaches a set pressure (for example, a pressure close to vacuum), the second on-off valve 7 is closed and the third on-off valve 8 is opened. Therefore, in this case, the cold soot passes through the compressor 1, the four-way switching valve 2, the indoor heat exchanger 3, the pressure reducer 4, the third on-off valve 8, and the soot heater 9 in order, and returns to the compressor 1 in the refrigeration cycle. Configure.
Therefore, a stable heat pump type refrigeration cycle can be obtained in which no cold air accumulates particularly in the outdoor heat exchanger 6.

That is, when the first and second on-off valves 5 and 7 are closed simultaneously,
If a lot of cold soot accumulates in the outdoor heat exchanger 6, there is a risk that the pressure of the refrigeration cycle or the temperature of various parts will rise abnormally, causing problems. Electricity is supplied to raise the temperature of the heat medium 10 in advance until it becomes stable, and then the first, second, and third on-off valves 5,
This problem can be solved by controlling the opening and closing of 7 and 8. Furthermore, in this embodiment, the heating medium 10 is heated to a stable temperature before removing the refrigerant that has accumulated in the outdoor heat exchanger 61. Therefore, the refrigerant flowing through the bypass circuit after the cold soot is removed can quickly absorb the amount of heat from the heat medium 10, and as a result, a stable high-temperature heating effect can be obtained from the indoor heat exchanger 3. Moreover, the heating effect is not lost when switching to operation at low outside temperatures.

The thermostat 12 of this embodiment may be a pressure switch that detects the pressure in the refrigeration cycle, or a thermostat that detects the temperature in the refrigeration cycle.

Further, the pressure switch 13 may be a thermostat that detects the temperature during the refrigeration cycle, or a timer switch that operates simultaneously with the energization of the heater 11. Furthermore, the thermostat 12 can be similarly implemented as a manual changeover switch that is operated depending on the normal state and low temperature state of the outside temperature.

Furthermore, similar effects can be expected when the timer switch 15 is used as a thermostat that detects the temperature of the heat medium 10.
Furthermore, the heater 1 that heats the heat medium 10 may be a heating device using gas, kerosene, or the like as fuel, or may be configured to heat a straight bale cold soot pipe without using a heat medium to heat the cold soot.

As is clear from the above embodiments, the air conditioner operation control device according to the present invention includes a compressor, a four-way switching valve, an indoor heat exchanger, a pressure reducer, an outdoor heat exchanger, and a cold soot heater that heats cold soot. are connected to form a heat pump type refrigeration cycle, and first and second on-off valves are provided on the inlet and outlet sides of the outdoor heat exchanger in this refrigeration cycle, respectively, and at least the first and second on-off valves are provided on the inlet and outlet sides of the outdoor heat exchanger. A bypass circuit having at least a third on-off valve is provided in parallel with the series circuit consisting of an on-off valve and an outdoor heat exchanger, and further, after a predetermined period of time has elapsed from the start of operation of the refrigerant heater, the first on-off valve and the third on-off valve are Close the on-off valve No. 3 and open the second on-off valve, and close the second on-off valve after a predetermined time has elapsed or when the cold soot pressure or temperature in the outdoor heat exchanger reaches a predetermined value. By opening only the third on-off valve, cold soot in the refrigeration cycle can be heated without accumulating cold soot in the outdoor heat exchanger, and stable heat pump refrigeration cycle operation can be obtained, making it particularly stable and effective. In addition to being able to perform a heating operation, the refrigerant heater is used to heat the returned cold butterfly in advance, and then the soot inside the outdoor heat exchanger is removed, so that the heating operation continues even after the flow of cold soot to the outdoor heat exchanger is stopped. The returned cold soot absorbs heat from the cold soot heater, enabling continuous and effective heating operation.

Furthermore, by operating the cold soot heater when the outdoor temperature or the temperature or pressure in the refrigeration cycle reaches a set value, stable heating operation can be performed even at low outdoor temperatures, which has various advantages. It is.

[Brief explanation of drawings]

Fig. 1 is a heat pump refrigeration cycle diagram of an air conditioner equipped with an operation control device according to an embodiment of the present invention;
The figure is an electrical control circuit diagram of the on-off valve in the same operation control device. 1... Compressor, 2... Four-way sliding sliding valve, 3
...Indoor heat exchanger, 4...Pressure reducer, 5...
...First on-off valve, 6...Outdoor heat exchanger,
7... Second on-off valve, 8... Third on-off valve, 9... Cold soot heater, 12... Thermostat, 13... ··pressure switch. Figure 1 Figure 2

Claims (1)

[Claims] 1 Compressor, four-way switching valve, indoor heat exchanger, pressure reduction mechanism,
A heat pump type refrigeration cycle is constructed by connecting an outdoor heat exchanger and a refrigerant heater that heats the refrigerant, and first and second on-off valves are provided on the inlet side and the outlet side of the outdoor heat exchanger in this refrigeration cycle, respectively. Further, a bypass circuit having at least a third on-off valve is provided in parallel with the series circuit consisting of at least the first and second on-off valves and the outdoor heat exchanger, and further, the operation of the refrigerant heater is controlled. A heating control device and a valve control device for controlling the opening and closing of the first to third on-off valves are respectively provided, and after a predetermined period of time has elapsed from the start of operation of the refrigerant heater, the first and third on-off valves are closed and at the same time. The second on-off valve is opened, and after a predetermined time has elapsed or when the refrigerant pressure or temperature in the outdoor heat exchanger reaches a predetermined value, the second on-off valve is closed and the third on-off valve is closed.
An air conditioner operation control device configured to open only the on-off valve.