JPS6257897B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to current limitation during refrigerant removal operation control in an air conditioner equipped with a vaporizing refrigerant heater that improves heating capacity at low outside temperatures.

Conventional configurations and their problems In general, in this type of air conditioner, when the air conditioner is stopped once from a refrigerant heating operation state, and then the refrigerant heating operation is restarted when the evaporative refrigerant heater is still warm, , refrigerant removal control is performed to remove the refrigerant accumulated in the outdoor heat exchanger and create a stable refrigeration cycle. However, in this case, since the evaporative refrigerant heater is in a warm state, the pressure increases due to preheating, increasing the pressure difference between the discharge and suction of the compressor. The drawback was that when electricity was applied to the heater that vaporized the liquid fuel in the refrigerant, a specified current was generated, making it impossible to continue normal refrigerant heating operation.

Purpose of the Invention The present invention aims to solve the above-mentioned conventional drawbacks.
A current control device is installed in a part of the evaporative refrigerant heater,
By connecting the relay contacts of this current control device to the control device, the current is detected during or at the start of refrigerant removal from the outdoor heat exchanger, and the heater and indoor blower are controlled. . In other words, if you drain the refrigerant while the evaporative refrigerant heater is still warm,
When the current control device reaches the set current, the control device operates, the heater stops, and the indoor blower turns to radiate heat and lower the pressure, at the same time keeping the current within the specified range.

Composition of the Invention In order to achieve the above object, the heating operation control device for an air conditioner of the present invention has the following features:
A refrigerant circuit is formed that circulates through a compressor, an indoor heat exchanger, and a vaporizing refrigerant heater, and an indoor blower is provided corresponding to the indoor heat exchanger to send air that has exchanged heat with the indoor heat exchanger into the room. The evaporative refrigerant heater is provided with an electric heater that vaporizes liquid fuel, and detects when the current of the entire air conditioner reaches a predetermined current at the start of heating operation when the evaporative refrigerant heater is activated. The present invention is configured to include a current control device that cuts off power to the electric heater and powers the indoor blower.

DESCRIPTION OF EMBODIMENTS Hereinafter, a heating operation control device for an air conditioner according to an embodiment of the present invention will be described with reference to FIGS. 1 and 2.

In the figure, 1 is a compressor, 2 is a four-way switching valve,
3 is an indoor heat exchanger, 4 is a pressure reduction device, 5 is a check valve that passes refrigerant during cooling, 6 is an indoor heat exchanger, 7 is a check valve, 8 is the flow of refrigerant during refrigerant heating operation and cooling operation 9 is a vaporizing refrigerant heater that heats the return pipe to the compressor 1, and this vaporizing refrigerant heater 9 includes a heat medium 9a such as water and heats the heat medium 9a. There is a heating device. In this heating device, 15 is a combustion fan, 16 is a rotating plate, and 17 is a motor connected to the combustion fan 15 and the rotating plate 16. 18 is a pipe provided so that liquid fuel is sprayed on the rotary plate 16; 19 is an on-off valve that controls the supply of liquid fuel flowing through the pipe 18; 20 is an electric heater; 21
is a spark plug, and 22 is an exhaust port. 10 is an on-off valve that connects the discharge side and suction side of the compressor 1. 11 and 12 are an indoor blower and an outdoor blower, respectively. A refrigeration cycle is constructed by connecting these in a ring as shown in the figure. This is a current control device that limits the current. 24 is a compressor 1, an indoor blower 11, an outdoor blower 12, a four-way switching valve 2, an on-off valve 8, 10, 19,
This is a control device for controlling the combustion fan 17, the spark plug 21, and the electric heater 20, which are connected to each other by relays as shown in FIG. 2.
That is, a compressor 1, a four-way switching valve 2, an on-off valve 8,
10, indoor blower 11, outdoor blower 12, motor 17, on-off valve 19, electric heater 20, and spark plug 21 are relay contacts 1a, 2a, 8a, 1, respectively.
0a, 11a, 12a, 17a, 19a, 20
a and 21a, and these series circuits are connected in parallel to each other.

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 6, the check valve 5, the pressure reducer 4, the indoor heat exchanger 3, the four-way switching valve 2, A refrigeration cycle is configured in which the refrigeration cycle passes through the check valve 7 and returns to the compressor 1.

Next, when performing a heating operation using the vaporization type refrigerant heater 9, that is, a refrigerant heating operation, the refrigerant is sent to the compressor 1, the four-way switching valve 2, the indoor heat exchanger 3, the on-off valve 8, and the vaporization type refrigerant heater 9. Two cycles are constructed: a refrigeration cycle in which the fluid flows in and returns to the compressor 1, and a refrigeration cycle in which the fluid flows from the compressor 1 through the on-off valve 10 and returns to the compressor 1. However, in the case of refrigerant heating operation, the refrigerant does not pass through the outdoor heat exchanger 6 due to the check valves 5 and 7. Simultaneously with the refrigerant heating operation, the heater 20 is energized until the temperature of the portion where the heater 20 is provided rises to a certain level or higher.

Here, when starting the refrigerant heating operation using the evaporative refrigerant heater 9, in order to obtain a stable refrigeration cycle,
It is necessary to remove the refrigerant accumulated in the outdoor heat exchanger. This refrigerant removal control method first closes the on-off valves 8 and 10 for a certain period of time, and then the refrigerant accumulated in the outdoor heat exchanger 6 is removed by the four-way switching valve 2, the check valve 7,
Through the compressor 1, a four-way switching valve 2, an indoor heat exchanger 3
After passing through the refrigerant, the on-off valve 8 and the check valve 5 prevent the refrigerant from flowing any further and eventually accumulate inside the indoor heat exchanger 3. Further, the refrigerant that had accumulated in the vaporization type refrigerant heater 9 also accumulates inside the indoor heat exchanger 3. After this refrigerant extraction control is completed, the motor 17 rotates, the combustion fan 15 and the rotary plate 16 rotate, and at the same time, the on-off valve 19 opens and the liquid fuel flows from the pipe 18 to the rotary plate 16 and is stirred into mist. When this state is reached, it is vaporized by the electric heater 20 and ignited by the ignition plug 21. In addition, indoor blower 11
In order to prevent cold air from blowing out at the start of refrigerant heating operation, the operation is stopped for a certain period of time or until the current control device 23 reaches a set current.

Normally, refrigerant extraction control is performed in a cold state, that is, when the vaporization type refrigerant heater 9 is cold, because there is no preheating in the vaporization type refrigerant heater 9, no heat is given to the refrigerant, and therefore the refrigerant extraction control is performed. In addition, the pressure does not increase, and even if the electric heater 20 is energized, the current does not increase, so it stays within the specified range.

However, when performing refrigerant heating operation in a hot state, that is, in a state where the evaporative refrigerant heater 9 has once warmed up, the electric heater 20 is not energized because there is preheating in the evaporative refrigerant heater 9 during refrigerant extraction control. Heat is given to the refrigerant even if it is not. Therefore, when the current control device 23 reaches the set current during refrigerant extraction control and at the start of refrigerant extraction, the electric heater 20 is stopped energizing and at the same time the indoor blower 11 is operated to radiate heat.

In this way, by stopping the electric heater 20 and operating the indoor blower 11 using the current control device 23, the current consumption of the entire air conditioner is kept within the specified current, and stable refrigeration cycle operation is achieved. can continue.

Effects of the Invention As is clear from the description of the embodiments above, according to the heating operation control device for an air conditioner of the present invention, when the current control device detects a current higher than the set current, the current limiting device This system stops the power supply to the electric heater installed in the heater, which vaporizes liquid fuel, and operates the indoor blower, so that the pressure in the refrigeration circuit does not rise abnormally and stabilizes while the refrigerant is being removed. If a refrigeration cycle is obtained and the current control device is at or above the set current at the same time as the refrigerant is removed, cold air will not come out even if the indoor blower rotates during the refrigerant removal, and the electric heater will not be energized. Furthermore, even if the electric heater is turned off after the refrigerant drain is finished, the evaporative refrigerant heater will still be warm, so it will ignite within a short period of time. , cold air does not blow out. In addition, since the current consumption of the entire air conditioner is within the specified range, only a wire with a small current capacity is required, and the specified current breaker does not trip, so heating operation does not stop during operation. play.

[Brief explanation of the drawing]

FIG. 1 is a refrigeration cycle diagram of an air conditioner equipped with a heating operation control device according to an embodiment of the present invention, and FIG. 2 is a partial electrical circuit diagram of the air conditioner. 1... Compressor, 2... Four-way switching valve, 3... Indoor heat exchanger, 4... Pressure reducer, 5... Check valve, 6...
Outdoor heat exchanger, 8... Opening/closing valve, 9... Evaporative refrigerant heater, 11... Indoor blower, 20... Electric heater, 23... Current control device.

Claims (1)

[Claims] 1 During heating operation, a refrigerant circuit is formed in which the refrigerant circulates through the compressor, the indoor heat exchanger, and the evaporative refrigerant heater, and the air that has been heat exchanged with the indoor heat exchanger corresponding to the indoor heat exchanger is sent indoors. The vaporizing refrigerant heater is provided with an electric heater that vaporizes liquid fuel, and the current of the entire air conditioner reaches a predetermined current at the start of heating operation when the vaporizing refrigerant heater is activated. 1. A heating operation control device for an air conditioner, comprising: a current control device that detects this and cuts off power to the electric heater and energizes the indoor blower.