JPS5854576Y2 - kuukichiyouwasouchi - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to an improvement in the defrosting electric circuit of an evaporator during a heat pump heating operation of an air conditioner in which a blower pipe is opened to an air-conditioned space.

Conventionally, in a centralized air conditioner that has two independent refrigeration circuits each containing a compressor and distributes air through ducts to perform air conditioning, heat pump heating uses the heat exchanger of the outdoor heat exchanger unit as an evaporator. During operation, if the thermostats that sense the evaporation temperature of the evaporators of each refrigeration circuit are connected to the corresponding four-way valve coils, if the evaporation temperature of the evaporator of one refrigeration circuit drops abnormally,
The thermostat operates, the refrigeration circuit's four-way valve coil is no longer energized, the refrigeration circuit is reversed, and defrosting operation begins.

However, under conditions where the evaporation temperature of the evaporator of one refrigeration circuit drops abnormally, the evaporation temperature of the evaporator of the other refrigeration circuit also drops abnormally, making it easy for frost to form on the evaporator. ing.

Therefore, in the indoor heat exchanger unit, cooling is performed as a result of defrosting operation at the same time as heating with a small capacity, so the temperature of the air blown into the room becomes low, which has the disadvantage of causing discomfort. Ta.

In addition, in the above-mentioned centralized air conditioner, if only one of the two independent refrigeration circuits is equipped with a thermostat that senses the evaporation temperature, frost will form on the evaporator of the other refrigeration circuit, so it will not function properly. It had the disadvantage of not being able to drive properly.

The present invention eliminates the above-mentioned conventional drawbacks.

An embodiment of the present invention will be described in detail below with reference to the accompanying drawings.

1 is an indoor heat exchanger unit having a heat exchanger 2 and a blower 3 in which the refrigerant circuit is divided into two, and 4 is a compressor that forms a refrigeration circuit with a heat exchanger 5 and a blower 6 in which the refrigerant circuit is divided into two. An outdoor heat exchanger unit having 7 and 8 and four-way valves 9 and 10; 11 is a pressure switch 1 having contacts that open and close by sensing the condensation pressure of a refrigeration circuit including a compressor 8;
In the second pressure sensitive section, the pressure switch 12 is inserted in series into the electric circuit of the compressor 7.

Therefore, if the refrigerant pressure in the refrigeration circuit of the compressor 8 increases abnormally, the compressor 7 is stopped and the refrigerant pressure in the compressor 8 is gradually adjusted.

13 and 14 are de-icers for preventing frost on the evaporator during heat pump heating operation, 15 and 16 are temperature sensing parts of de-icers 13 and 14, respectively, 17 is a main switch, 18 is a remote switch, and 19 is a de-icer for preventing frost on the evaporator during heat pump heating operation. Trance,
20 is a relay, 21 is a magnet switch that turns on the power supply circuit when the main switch 17 and remote switch 18 are turned on, 22 is a cooling/heating switch, and 23 is a temperature sensing part of the temperature control device 24; 23 is provided on the windward side of the heat exchanger 2 of the indoor heat exchanger unit 1.

Relays 27 and 28 are coils of four-way valves 9 and 10, respectively, which are provided so that the blower 6 is operated even when either of the compressors 7 or 8 is operated.

Now, in order to perform air conditioning, when the main switch 17 and remote switch 18 are closed, voltage is applied to the secondary side of the transformer 19, which closes the circuit of the magnet switch 21 of the relay 20, and the compressors 7 and 8 and the blower are turned off. Drive 3 and 6.

In this way, when the compressors 7 and 8 are working and the heat pump heating operation is being performed, when the evaporation temperature of the evaporator of the refrigeration circuit including the compressor 7 falls, the temperature is detected by the temperature sensor 15 and frost is generated. The wear prevention wearer 13 turns OFF.

Therefore, the circuit of the four-way valve coil 27, 28 connected in series to the anti-frost icer 13 and the blowers 3, 6 is opened, and the refrigeration circuit including the compressor 7, 8 is reversed to carry out defrosting operation.

Note that the operation of the blowers 3 and 6 is stopped. In this way, the sudden air conditioner according to the present invention reverses both refrigeration circuits and stops the blowers 3 and 6 when the evaporation temperature of the evaporator of one refrigeration circuit drops to the temperature at which defrosting is required. , efficient defrosting operation can be performed, and during defrosting operation,
When heating operation is resumed after defrosting operation without blowing cold air, the room temperature rises quickly because the evaporators of the two refrigeration circuits have been completely defrosted.

The air conditioner of the present invention has two independent refrigeration circuits that open and close by sensing the refrigerant temperature of each evaporator in an operating state in which the heat exchanger of the outdoor heat exchanger unit serves as an evaporator. Defrost prevention deicers are connected in series to form a thermostat circuit, and the thermostat circuit connects the power supply circuits of the blower of the indoor heat exchanger unit and the blower of the outdoor heat exchanger unit, and the respective refrigeration circuits. The coil of the four-way valve is connected to the power supply via the thermostat circuit to open and close the coil of the four-way valve, and two refrigeration cycles are operated by the operation of one of the anti-frost icers. Defrosting operation can be performed in reverse, and the blowers in the indoor and outdoor heat exchanger units are completely stopped, preventing cold air from being blown into the room, and the two refrigeration circuits are completely defrosted. This has a great practical effect in that the room temperature rises quickly.

[Brief explanation of the drawing]

FIG. 1 is a refrigeration circuit diagram of an air conditioner according to an embodiment of the present invention, and FIG. 2 is an electric circuit diagram of the same air conditioner. 1... Indoor heat exchanger unit, 2...
・Heat exchanger, 3...Blower, 4...Outdoor heat exchanger unit, 5...Heat exchanger, 6...
...Blower, 7,8...Compressor, 9゜1
0... Four-way valve, 11... Pressure sensitive part of pressure switch 12, 12... Pressure switch, 13.
14... Icer for frost prevention, 15.1
6...Temperature sensing part, 17...Main switch, 18...Remote switch, 19...
...Transformer, 20...Relay, 21...
...magnetic screw 1 to switch, 22...cooling/heating switch, 23...temperature sensing section, 24...
・Temperature control device, 25.26...Relay, 27
, 28... Coils of four-way valves 9 and 10.

Claims (1)

[Scope of utility model registration request] The refrigerant circuit of the heat exchanger of the indoor heat exchanger unit is divided into two, and the refrigerant circuit of the heat exchanger of the outdoor heat exchanger unit is further divided into two, and each refrigerant circuit includes a compressor, It has two independent refrigeration circuits, and opens and closes by sensing the refrigerant temperature of each evaporator when the heat exchanger in the outdoor heat exchanger unit of each refrigeration circuit is operating as an evaporator. A thermostat circuit is formed by connecting independent anti-frost icers in series, and the thermostat circuit connects the power supply circuits of the blower of the indoor heat exchanger unit and the blower of the outdoor heat exchanger unit, respectively. An air conditioner in which the power supply circuit or the coil of the four-way valve is connected to a power source via the thermostat circuit so as to open and close the coil of the four-way valve of the refrigeration circuit.