JPS6224197Y2 - - Google Patents

Description

[Detailed description of the invention] This invention relates to a burner-assisted heat pump type air conditioner, and in particular achieves energy-saving operation by improving the switching method between refrigerant heating and heat pump heating when a heating command is issued.

The burner-assisted heat pump type air conditioner is composed of a refrigerant circuit shown in Fig. 3, where 11 is a compressor, 12 is a four-way valve, 13 is an indoor heat exchanger, 15 is an outdoor heat exchanger, and 17 is an aperture. In the device, the refrigerant pipes are sequentially connected through refrigerant pipes 20 to form a refrigerant circuit. 23 is a bypass pipe, one of which connects the four-way valve 12 and the outdoor heat exchanger 15.
The other end is connected to the refrigerant pipe 21 between the expansion device 17 and the indoor heat exchanger 13, and a solenoid valve 18 is provided in the middle. 19 is a refrigerant heater, which is a throttle device 1 for the bypass pipe 23;
It is provided between the 7 side connection point 24 and the indoor heat exchanger 13. 14 is an indoor blower, and 16 is an outdoor blower.

In the flow of refrigerant in this case, the four-way valve 12
As shown in this figure, the line changes to a solid line during heating and a broken line during cooling. Next, during heat pump operation, the refrigerant is discharged by the compressor 11, sent to the indoor heat exchanger 13 via the four-way valve 12, and is condensed by radiating heat to indoor air by the indoor blower 14. The condensed refrigerant passes through the refrigerant heating heat exchanger 19, but the burner (not shown) is not ignited, and is sent as it is to the outdoor heat exchanger 15 via the throttle device 17, and is then passed through the outdoor blower 16. The heat of the outdoor air is absorbed, evaporated and returned to the compressor 11, thereby forming a heat pump heating cycle. At this time, the solenoid valve 18 is in a closed state.

Next, during refrigerant heating and heating, the refrigerant condensed in the indoor heat exchanger 13 is evaporated by being heated by a burner (not shown) in the refrigerant heating heat exchanger 19, and the solenoid valve 18 is opened to throttle the refrigerant. The device 17 and the outdoor heat exchanger 15 are bypassed to form a refrigerant heating and heating cycle. At this time, the outdoor blower 16 is stopped.

In the burner-assisted heat pump type air conditioner configured as described above, in the conventional control circuit, as shown in FIG. 1, when a heating command is issued from the operation selector switch 1, the four-way valve electromagnetic switch 3 is energized. .

When the indoor temperature is low and the temperature controller 7 is turned on, the electromagnetic switch 2 for operating the compressor is excited. Even if the heat pump is operated, if the frost detection switch 8, which is used to determine that the air condition is free of frost on the outdoor heat exchanger, is turned off due to high outside air temperature,
The refrigerant heating controller 4 is turned OFF, heat pump heating is performed, and when the outside air temperature is low and ON, the refrigerant heating controller 4 is turned ON, ignites the burner, turns on the solenoid valve 18, and turns on the outdoor blower 16. Turn off and perform refrigerant heating.

Therefore, the operating range of heat pump heating with good operational efficiency is only when the outside temperature is high without the risk of frost formation, and heat pump heating is only possible when the heating load is relatively small after the indoor temperature has risen to the set temperature. Even in areas that could be adequately covered, refrigerant heating was used, impairing the effective use of heat pump heating.

This invention was made in order to eliminate the above-mentioned drawbacks, and provides a burner-assisted heat pump type air conditioner that can effectively utilize sufficient heat pump heating.

Hereinafter, an embodiment of the control circuit for the burner-assisted heat pump type air conditioner of this invention will be described based on the drawings. FIG. 2 is a circuit diagram of one embodiment.

Reference numeral 1 denotes an operation changeover switch, to which a four-way valve electromagnetic switch 3 is connected in series. 2 is an electromagnetic switch for compressor operation, 4 is a refrigerant heating controller, and 7 is a temperature regulator, which is composed of a two-stage thermostat and has a low temperature side contact 7a.
and a high temperature side contact 7b, the refrigerant heating controller 4 is connected to the low temperature side contact 7a, and is connected to the operation changeover switch 1 in parallel with the four-way valve electromagnetic switch 3. The compressor operating electromagnetic switch 2 is connected to 7b, which is connected to the operation changeover switch 1 in parallel with the refrigerant heating controller 4 and the four-way valve electromagnetic switch 3. A frost detection switch 8 is connected in series with the auxiliary relay 9, and connected to the temperature regulator 7 and the compressor operating switch so as to be connected in parallel with the electromagnetic switch 2 for compressor operation and the refrigerant heating controller 4. It is connected between the electromagnetic switch 2 and the refrigerant heating controller 4. 9a is the first of the auxiliary relays 9;
A contact point is connected in series with the frost detection switch 8, and also connects the compressor operation electromagnetic switch 2 and the refrigerant heating controller 4, which are respectively connected to the temperature regulator 7, to each other. There is. 9b is a second contact of the auxiliary relay 9, which is connected in parallel with the frost detection switch 8.

Next, to explain the operation of the control circuit of the burner-assisted heat pump type air conditioner of this invention, first, when the indoor temperature is low, both stages of the low-temperature side contact 7a and the high-temperature side contact 7b of the temperature controller 7 are ON.
When the compressor operation solenoid switch 2, the four-way valve solenoid switch 3, and the refrigerant heating controller 4 are turned on,
Perform refrigerant heating.

When the indoor temperature rises and the low-temperature side contact 7a of the temperature regulator 7 turns off to reach the set temperature or higher, the refrigerant heating controller 4 turns off and heat pump heating is performed.

When the heat pump heating has sufficient capacity, the indoor temperature further rises, and the high temperature side contact 7b of the temperature controller 7 is also turned off, thereby turning off the four-way valve electromagnetic switch 3 and stopping the heating operation.

During operation of the heat pump, when the heating load is large and the temperature falls below the set temperature, resulting in insufficient capacity, the low temperature side contact 7a of the temperature controller 7 is turned ON again to perform refrigerant heating and heating.

In addition, during heat pump operation, the outdoor heat exchanger 1
5 and when the frost detection switch 8 turns ON, the auxiliary relay 9 is energized and is self-held by the first contact 9a and the second contact 9b, so that even if the frost detection switch 8 returns, the temperature cannot be adjusted. The high temperature side contact 7b of the device 7
Refrigerant heating continues until the unit is turned off.

As described above, according to the control circuit of the burner-assisted heat pump type air conditioner of this invention, sufficient heating capacity is demonstrated by refrigerant heating at the start of heating operation, and when the temperature exceeds the set temperature, heat pump heating with high operational efficiency is achieved. When the defrost command is issued, refrigerant heating and heating are controlled again, allowing effective use of heat pump heating.

[Brief explanation of the drawing]

Figure 1 is a control circuit diagram of a conventional burner-assisted heat pump type air conditioner, Figure 2 is a control circuit diagram of the burner-assisted heat pump type air conditioner of this invention, and Figure 3 is a refrigerant diagram of a burner-assisted heat pump type air conditioner. It is a circuit diagram. In addition, the same reference numerals in the figures indicate the same or equivalent parts, 2 is an electromagnetic switch for compressor operation, 4 is a refrigerant heating controller, 7 is a temperature regulator, 7a is a low temperature side contact,
7b is a high temperature side contact, 8 is a frost detection switch, 9 is an auxiliary relay, 9a is a first contact, and 9b is a second contact.

Claims (1)

[Scope of utility model registration request] In a control circuit in which an operation selector switch and a four-way valve electromagnetic switch are connected in series, and an electromagnetic switch for compressor operation and a refrigerant heating controller are provided,
A temperature controller with a two-stage thermo function equipped with a low-temperature side contact and a high-temperature side contact, a refrigerant heating controller connected to the low-temperature side contact of the temperature controller, and an electromagnetic switch for compressor operation connected to the high-temperature side contact, and A series circuit consisting of an auxiliary relay and a frost detection switch is connected to the temperature regulator in parallel with the refrigerant heating controller and the electromagnetic switch for compressor operation, and the first contact of the auxiliary relay is connected to the frost detection switch. The second contact of the auxiliary relay is connected in series with the switch and between the refrigerant heating controller, the temperature regulator, and the electromagnetic switch for compressor operation, and the temperature control, and the second contact of the auxiliary relay is connected in parallel with the frost detection switch. When the frost detection switch turns on, it is self-held and both the refrigerant heating controller and the compressor operation electromagnetic switch are turned off until both stages of the temperature controller turn off.
A burner-assisted heat pump type air conditioner having a control circuit that is turned on.