JPS6330929Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Field of Application] This invention relates to a control circuit for a refrigerant-heating type air-conditioning device that heats a refrigerant using combustion gas or the like to perform space heating.

[Conventional technology]

FIG. 3 is a refrigerant circuit configuration diagram showing a conventional air conditioner/heater disclosed in, for example, Japanese Unexamined Patent Publication No. 57-67760. In the figure, 1 is a compressor, 2 is a four-way valve, 3 is an outdoor heat exchanger, 4 is an outdoor fan motor, 5 is a solenoid valve, 6 is a capillary tube, 7 is an indoor heat exchanger, 8 is an indoor fan motor, 9 is a solenoid valve, 10 is a check valve, 11 is an accumulator; , 9 and the check valve 10, this is a conventionally known heat pump refrigerant circuit.

Furthermore, a refrigerant heating heating circuit 15 including a solenoid valve 12, a refrigerant pump 13, and a refrigerant heater 14 is additionally connected, and the refrigerant heater 14 is provided with a gas burner 16.

Next, the operation will be explained.

At the start of heating operation, the refrigerant leaving the compressor 1 is transferred to the check valve 10, indoor heat exchanger 7, capillary tube 6, by switching the four-way valve 2 to the heating operation circuit.
It flows through the solenoid valve 5, the outdoor heat exchanger 3, the four-way valve 2, and the accumulator 11 in this order. Along with the heat pump heating operation, a part of the refrigerant liquid condensed in the indoor heat exchanger 7 is transferred to the refrigerant pump 1 via the solenoid valve 12.
3, the refrigerant flows into the refrigerant heater 14, and the gas burner 16
At the same time, the refrigerant is heated and evaporated and transported to the indoor heat exchanger 7.

[Problem that the invention attempts to solve]

Conventional heating and cooling systems are configured as described above, so when heating operation starts, the high-temperature refrigerant gas that flows into the indoor heat exchanger is sent through the refrigerant gas sent from the compressor and the refrigerant pump from the refrigerant heater. There were problems such as an increase in heating capacity due to condensation in the indoor heat exchanger as it added refrigerant gas.

This invention was made in order to solve the above-mentioned problems, and the purpose is to provide a circuit that controls the amount of refrigerant to be circulated so that it does not become excessive at the start of refrigerant heating operation.

[Means for solving problems]

The control circuit of the air conditioning system according to this invention consists of a refrigerant circuit in which a compressor, a four-way valve, an indoor heat exchanger, a capillary tube, and an outdoor heat exchanger are sequentially connected through refrigerant piping, and the outdoor heat exchanger is used to exchange endothermic heat in parallel with the refrigerant circuit. In an electric circuit that is equipped with a check valve on the outdoor heat exchanger side, a check valve on the endothermic heat exchanger side, and a cooling/heating changeover switch to switch between continuous cooling operation, a pressure switch and a pressure switch are installed in the heating side circuit of the cooling/heating changeover switch. The circuit is equipped with a relay that opens and closes the outdoor fan in response to the

[Effect]

The control circuit for the air conditioning system in this invention opens and closes the outdoor blower in accordance with the opening and closing operations of the pressure switch that detects the refrigerant pressure, and after the heating operation starts, until the low pressure or the high pressure rises above a predetermined value. Alternatively, by operating the outdoor heat exchanger blower for a predetermined period of time after the start of heating, the refrigerant can be rapidly stored in the outdoor heat exchanger and the refrigerant in the refrigerant circuit can be stabilized quickly.

[Example of idea]

An embodiment of this invention will be described below with reference to the drawings.

In FIG. 1, 1 is a compressor, and 7 is an indoor heat exchanger, which functions as an evaporator during cooling and as a condenser during heating. 3 is an outdoor heat exchanger, which acts as a condenser during cooling. 14 is an endothermic heat exchanger, which acts as an evaporator during heating. A combustor 16 burns kerosene or the like during heating and sends the generated combustion gas to the endothermic heat exchanger 14 to heat the refrigerant. 2 is a four-way valve that switches the refrigerant circuit between cooling and heating. 17 is the outdoor heat exchanger 3
This is a side check valve that prevents refrigerant from circulating to the outdoor heat exchanger 3 during heating to the outlet side pipe of the outdoor heat exchanger 3. 18 is a check valve on the side of the endothermic heat exchanger 14, which prevents refrigerant from circulating to the endothermic heat exchanger during cooling. 6 is a capillary tube for cooling, which performs a throttling action during cooling. Reference numeral 19 denotes a heating check valve, which is provided in the first bypass path 20 that bypasses the cooling capillary tube 6 during heating, and is provided for the purpose of not performing a throttling action during heating. 21 is a second bypass passage for bypassing a part of the refrigerant discharged from the compressor 1 to the suction side of the compressor 1 during heating; a solenoid valve 22 controls the presence/absence of the bypass; and a solenoid valve 22 adjusts the bypass amount. It consists of a bypass capillary tube 23 for this purpose. 24
is a blower for an outdoor heat exchanger.

Next, an electric circuit diagram of an embodiment of this invention is shown.

In FIG. 2, 1 is a compressor, 24 is a blower for the outdoor heat exchanger, 25 is a blower for the indoor heat exchanger, and 2 is a four-way valve, which is in a state of heating when energized and cooling when not energized. 22 is a bypass solenoid valve, 26 is a power switch, 27 is a heating/cooling switch, and 28 is a pressure switch that senses the low pressure during heating.
The contact turns ON when the low pressure is above a predetermined value. 29 is the auxiliary relay coil, 30
is the contact point of the auxiliary relay.

Next, the operation of the refrigerant circuit of this invention will be explained.

During cooling, the refrigerant flows through the compressor 1 → four-way valve 2 → outdoor heat exchanger 3 → outdoor heat exchanger 3 side check valve 17 →
Cooling capillary tube 6 → indoor heat exchanger 7 → four-way valve 2 →
It circulates through the compressor 1 and performs cooling. During cooling, the outdoor heat exchanger blower 24 operates to exchange heat between the refrigerant and the outside air. In the case of heating, the refrigerant is supplied through the compressor 1 → four-way valve 2 → indoor heat exchanger 7 → heating check valve 19 → endothermic heat exchanger 14 side check valve 18
The air circulates in the following order: → endothermic heat exchanger 14 → four-way valve 2 → compressor 1 to perform heating. During heating, in order to adjust the amount of refrigerant circulating through the indoor heat exchanger 7 and the endothermic heat exchanger 14, the solenoid valve 22 opens and a part of the refrigerant discharged from the compressor 1 is passed through the bypass path 21 and sucked into the compressor 1. I'm moving it back to the side. Since there is no need to exchange heat with outside air during heating, there is no need to use the outdoor heat exchanger blower 24.
is not operating, but instead the combustor 16 is burning, heating the refrigerant passing through the endothermic heat exchanger 14, and the refrigerant exchanges heat with the combustion gas and evaporates to become gas. A cycle is formed in which the gaseous refrigerant is pumped by the compressor 1, condensed by exchanging heat with indoor air in the indoor heat exchanger, and evaporated again by the endothermic heat exchanger 14 to become gaseous. During heating, the refrigerant exchanges heat with the high-temperature combustion gas in the endothermic heat exchanger 14, so there is no need to keep the low pressure low as in conventional heat pump air conditioners that use the atmosphere as a heat source. Therefore, the heating circuit does not include any throttling mechanism such as a capillary tube, and the cycle is formed with a relatively high low pressure of 15 kg/cm ² or more, and since the pressure difference between high and low pressure is small, compressor 1 It also requires less input.

However, during heating, the outdoor heat exchanger 3 is exposed to low-temperature outside air, and other heating medium circulation paths are at high temperature and pressure, so the refrigerant in the outdoor heat exchanger 3 falls below the saturation temperature. , condenses and passes through outdoor heat exchanger 3
Since the other refrigerants that accumulate in the liquid state are at high temperatures and high pressures, the refrigerants accumulate in the outdoor heat exchanger 3, which is exposed to the outside air and has a low temperature, and eventually become full of liquid. As mentioned above, the outdoor heat exchanger 3 during heating
The system is filled so that even if the system becomes full, there will be no shortage of refrigerant circulating through other systems, and there will be no problem during stable heating operation.

To explain the operation of one embodiment of the electric circuit of this invention configured as described above, when cooling/heating selector switch 27 is turned OFF during cooling and when power switch 16 is turned ON, indoor heat exchanger blower 2
5 is in operation, and compressor 1 is in operation. Since the four-way valve 2 is not energized, it is in the cooling state, and the auxiliary relay coil 29 is not energized, so the auxiliary relay contact 30 is closed, and the outdoor heat exchanger blower 2 is in the cooling state.
4 is energized, operates, and performs cooling. Further, since the electromagnetic valve 22 is not energized, no refrigerant flows into the bypass path 21.

Next, when heating, turn on the cooling/heating switch 27.
Then, when the power switch 26 is turned on, the indoor heat exchanger blower 25 is operated and the compressor 1 is operated. Since the four-way valve 2 is energized, it becomes a heating state, and because the solenoid valve 22 is energized, the bypass path 21 is energized.
Refrigerant also flows through the space, forming a refrigerant flow path for heating. Immediately after heating operation starts, the pressure in the refrigerant circuit has not increased, so the pressure switch 28 is OFF, the auxiliary relay coil 29 is not energized, and the auxiliary relay contact 30 is closed, so the outdoor heat exchanger 24 is driving. When the outdoor heat exchanger blower 24 is operating, the outside air and the refrigerant in the outdoor heat exchanger 3 rapidly exchange heat, and the refrigerant condenses to become full of liquid. In heating operation, the refrigerant is heated by the combustor 16, so
The pressure of the refrigerant quickly rises, and the low pressure rises above the set pressure of the pressure switch 28. When the low pressure reaches a predetermined value or higher, the pressure switch 28 turns on, and the coil 29 of the auxiliary relay is energized, the contact 30 of the auxiliary relay opens, and the outdoor heat exchanger blower 24 is turned on.
operation stops.

[Effect of idea]

As mentioned above, according to this invention, the blower for the outdoor heat exchanger operates only while the refrigerant pressure rises at the start of heating, so the refrigerant can be quickly stored in the outdoor heat exchanger. It can be seen that the refrigerant circuit can be stabilized, and once the refrigerant circuit is stabilized, there is no heat exchange between the outside air and the refrigerant, so it is highly efficient and extremely effective.

In the above embodiment, the outdoor heat exchanger blower is controlled by detecting the low pressure, but the same effect can be obtained by operating the outdoor heat exchanger blower for a predetermined period of time after heating starts.

[Brief explanation of drawings]

Fig. 1 is a refrigerant circuit diagram showing an air conditioning system that is an embodiment of this invention, Fig. 2 is an electric circuit diagram of Fig. 1,
FIG. 3 is a refrigerant circuit diagram showing a conventional example of this invention. In addition, 1 is a compressor, 2 is a four-way valve, 3 is an outdoor heat exchanger, 6 is a capillary tube for cooling, 7 is an indoor heat exchanger, 14 is an endothermic heat exchanger, 16 is a combustor, and 17 is outdoor heat Reference numeral 18 indicates a check valve on the side of the exchanger, 27 indicates a cooling/heating changeover switch, 28 indicates a pressure switch, and 29 indicates a relay. In the figures, the same reference numerals indicate the same or corresponding parts.

Claims (1)

[Scope of utility model registration request] The compressor, four-way valve, indoor heat exchanger, cooling capillary tube, and outdoor heat exchanger are connected in sequence through refrigerant piping to form a refrigerant circuit, and a combustor is installed in parallel with the outdoor heat exchanger to generate endothermic heat. An exchanger is provided, and a check valve is provided on the outlet side of the outdoor heat exchanger and the inlet side pipe of the endothermic heat exchanger, respectively, and the four-way valve is switched by switching the cooling/heating changeover switch. In a device that heats the refrigerant flowing inside, the heating side circuit of the cooling/heating changeover switch is equipped with a pressure switch that detects the refrigerant pressure and a relay that opens and closes the blower for the outdoor heat exchanger in response to the opening and closing operations of this pressure switch. Control of an air-conditioning and heating system, characterized in that after heating operation starts, an outdoor heat exchanger blower is operated until low pressure or high pressure rises above a predetermined value, or for a predetermined time after heating operation starts. circuit.