JPS5913548Y2 - Air conditioner operation control device - Google Patents

Description

[Detailed description of the invention] This invention relates to an operation control device for an air conditioner equipped with a heating function, and its purpose is to prevent overload operation that occurs when heating is performed when the outside air temperature is relatively high. This is one of the

Conventionally, in this type of air conditioner, overload prevention operation control has been configured as shown in FIG.

In the figure, the refrigerant circuit includes a compressor 21. Discharge muffler 2
2. Four-way valve 23. Outdoor heat exchanger 24. Capillary tubes 25, 26. Indoor heat exchanger 27. Accumulator 28, outdoor fan 29. It is composed of an indoor blower 30 and the like.

The pressure 5W31 is installed between the high pressure side of the four-way valve 23 during heating and the indoor heat exchanger 27, and the three-way valve 32 is installed between the suction side of the compressor 21 and the front side of the accumulator 28 and the high pressure side of the four-way valve 23. It is located between the sides.

Here, when the pressure on the high side increases during heating operation, the pressure switch 31 senses this and opens the three-way valve 32 to bypass the high pressure gas to the low pressure side and lower the high pressure side pressure and the discharge gas temperature.

However, with such a conventional configuration, the pressure on the high pressure side and the discharge temperature of the compressor 21 decrease to prevent overload, but the pressure on the low pressure side increases, so the input to the compressor 21 is increased. .

Generally, overload operation occurs when the outside air temperature is high, and the heating capacity required for heating when the outside air temperature is high is small.

Therefore, with such a bypass method, the input to the compressor 21 will be increased to prevent overload, which is a major drawback in terms of power consumption.
Furthermore, in order to prevent this overload, expensive parts such as a pressure switch 31 and a three-way valve 32 for bypass are required, resulting in an increase in cost.

The present invention eliminates the drawbacks found in the above-mentioned conventional operation control devices.

Hereinafter, FIG. 1 of the attached drawings showing one embodiment of the present invention,
This will be explained with reference to FIG.

In the figure, 1 is a compressor, 2 is a discharge muffler, 3 is a four-way valve, 4 is an outdoor blower placed opposite the outdoor heat exchanger 5, 6 and 7 are capillary tubes, and 8 is an indoor side. An indoor fan placed opposite the heat exchanger 9, 1
0 is an accumulator.

A first temperature regulator 11 detects the temperature of the outdoor heat exchanger 5, and its heat-sensitive cylinder 11a is attached to the outdoor heat exchanger 5.

Reference numeral 12 denotes a second temperature controller for detecting the outdoor temperature, and its heat-sensitive tube 12a is mounted at a position 91 where the outdoor temperature, such as the temperature of the intake air of the outdoor heat exchanger 5, can be detected.

13 is a power outlet, 14 is a main switch, 15 is an air-conditioning/heating selector switch, 16 is an indoor temperature controller, the indoor fan 8 is connected to the power outlet 13 via the main switch 14, and the compressor 1 is connected to the air-conditioning/heating selector switch 15. and the indoor temperature controller 16 are connected in parallel to the indoor fan 8 via a circuit that connects the indoor temperature controller 16 and the indoor temperature controller 16 .

Further, the coil 18 of the relay 17 is connected in parallel to the indoor fan 8 via the heating side contact H of the indoor temperature controller 16.

Further, the circuit of the outdoor blower 4 which connects the temperature controller 11.12 having the heat-sensitive tubes 11a and 12a, the circuit connected to the heating side contact H of the relay 17, and the circuit of the cooling side contact C of the relay 17 is as described above. It is connected in parallel with the compressor 1.

Here, in the second temperature regulator 12, when the thermosensitive tube 12a detects a temperature equal to or higher than a set temperature (for example, 13° C.) during heating operation, its movable contact is switched to the high temperature side (H side),
Conversely, when the thermosensitive cylinder 12a detects a temperature lower than the set temperature (for example, 13° C.), its driven contact is switched to the low temperature side (L side).

Therefore, the second temperature regulator 12 continuously operates the outdoor fan 4 when the outdoor temperature becomes equal to or lower than the installation temperature (for example, 13° C.).

Further, the first temperature regulator 11 includes a first temperature controller 11. It has two second set temperature points, and the heat sensitive tube 11a has a first set temperature (a temperature slightly lower than the temperature of the outdoor heat exchanger 4 during overload during heating, for example, 10°C) or higher. When this happens, the outdoor fan 4 is stopped, and the second set temperature (a temperature higher than the set value of an anti-freezing sensor (not shown) or a temperature that does not cause a large amount of liquid back up in the compressor 1, for example -1°C) is set.
When the temperature falls below, the outdoor fan 4 is operated.

In the above configuration, the heating operation will be explained.

In this case, since each movable contact of the air-conditioning/heating changeover switch 15 and the indoor temperature controller 16 is turned on to the heating side (H side), the relay coil 18 is energized and the relay 1
The movable contact 7 is connected to the heating side (H side).

First, during normal heating such as in winter, that is, when the outdoor temperature is below the set temperature (13° C.) of the second temperature regulator 12 (during high heating capacity operation), the second temperature regulator 12 is activated. The contact is placed on the low temperature side (L side).

Therefore, the outdoor fan 4 is operated independently of the first temperature controller 11, and has a large heating capacity. At some point (during low heating capacity operation), the movable contact of the second temperature regulator 12 is set to the high temperature side (H
side).

Therefore, the operation of the outdoor fan 4 is controlled by the operation of the first temperature regulator 11.

That is, when heating starts under the above conditions, both the low pressure and high pressure of the refrigerant cycle decrease as the compressor 1 operates, and the temperature of the outdoor heat exchanger 5 always reaches the second setting of the first temperature controller 11. Because it is lower than the temperature (-1℃),
When the contacts of the first temperature regulator 11 are closed, the outdoor fan 4
is driven.

Therefore, the amount of heat absorbed by the outdoor heat exchanger 5 increases, resulting in heating with a good start-up.

When the pressure on the low-pressure side of the refrigerant cycle increases due to an increase in outside air temperature or a decrease in the rotational speed of the indoor fan 8 during heating, the pressure inside the outdoor heat exchanger 5 increases. and temperature increases.

Therefore, the heat sensitive cylinder 11a senses this, and the temperature regulator 1
1 reaches the first set temperature and opens its contacts, the outdoor fan 4 stops.

When the outdoor fan 4 stops, the amount of heat absorbed by the outdoor heat exchanger 5 decreases significantly, so the pressure and temperature of the outdoor heat exchanger 5 decrease.

As a result, the temperature regulator 11 is lowered to the second set temperature, that is, the temperature before freezing occurs, its contact is closed, and the outdoor fan 4 is operated again to raise the temperature of the outdoor heat exchanger 5.

In this way, the outdoor fan 4 is repeatedly operated and stopped, and heating is continuously performed.

Therefore, at outdoor temperatures that require a large heating capacity, such as in winter, the outdoor fan 4 is operated to obtain a large heating effect, and at outdoor temperatures, which require a small heating capacity, such as in early spring. In this case, since the outdoor fan 4 is operated first, heating can be performed with a good start-up, and the ability of the outdoor fan 4 is controlled by intermittent operation.
A moderate heating effect is continuously obtained, and since the outdoor fan 4 operates to prevent overload that tends to occur during this operation, heating is not interrupted and comfort is greatly improved. do.

Since the outdoor fan 4 is stopped during overload when a smaller heating capacity is required, the pressure in the refrigeration cycle is reduced, and as a result, the input to the compressor 1 is reduced, thereby reducing power consumption.

Furthermore, since a large amount of liquid does not return to the compressor 1 when the outdoor blower 4 is stopped, the compressor 1 will not be damaged and the performance of the air conditioner will not be significantly reduced.

As is clear from the above embodiments, the air conditioner operation control device of the present invention includes a compressor, a four-way valve, a capillary tube, an indoor heat exchanger, an outdoor heat exchanger, an indoor blower,
A refrigerant circuit is constructed, each equipped with an outdoor blower, etc.
Furthermore, a first temperature regulator detects the temperature of the outdoor heat exchanger, and a second temperature regulator detects the outdoor temperature and energizes the first temperature regulator when the outdoor temperature is equal to or higher than a set temperature. A temperature regulator is provided, and the first temperature regulator has a first set temperature for detecting the temperature before overload of the outdoor heat exchanger, and a pre-freezing temperature lower than the first set temperature. A second set temperature is provided to be detected, and the first temperature regulator
When the temperature of the outdoor heat exchanger becomes higher than a first set temperature, the outdoor side blower is stopped, and when the temperature becomes lower than a second set temperature, the outdoor side blower is operated, and the temperature is controlled by a second temperature controller. , determine whether the outdoor temperature is a temperature that requires a large heating capacity or a temperature that requires a small heating capacity, and
Since the temperature controller controls the operation and stopping of the outdoor fan when the heating capacity is low, there is no need to continuously energize the outdoor fan regardless of outdoor temperature changes, that is, regardless of the heating capacity, resulting in a large power saving effect. Furthermore, when starting operation,
Even if the outdoor air blower stops due to high outdoor temperature, the outdoor air blower is operated as the temperature of the outdoor heat exchanger drops, so a large heating capacity can be obtained and heating with a good start-up can be obtained.

In addition, in the event of an overload with a small heating capacity, the outdoor blower is stopped and both the high and low pressure sides of the refrigeration cycle are reduced, reducing the load on the compressor and reducing the compressor input. Energy saving effect can be obtained.

Moreover, in the event of an overload, the compressor continues to rotate, so there is no interruption in heating, and there is no sudden temperature change in the room, improving comfort.

Furthermore, when the overload is removed and the temperature of the outdoor heat exchanger reaches the temperature before freezing occurs, the outdoor fan is operated to raise the temperature of the outdoor heat exchanger, so heating may be interrupted due to freezing. Moreover, it has various advantages, such as eliminating the need for three-way valves, pressure switches, etc. that were conventionally required for overload control, and simplifying the refrigerant circuit.

[Brief explanation of the drawing]

Fig. 1 is a refrigerant circuit diagram of an air conditioner equipped with an operation control device according to an embodiment of the present invention, Fig. 2 is an electric circuit diagram of the same operation control device, and Fig. 3 is an air conditioner diagram showing a conventional example. It is a refrigerant circuit diagram. 1... Compressor, 3... Four-way valve, 4...
...Outdoor blower, 5...Outdoor heat exchanger, 6,7...Capillary tube, 9...
... Indoor heat exchanger, 11... First temperature regulator, 12... Second temperature regulator.

Claims (1)

[Scope of utility model registration request] A refrigerant circuit including a compressor, a four-way valve, a capillary tube, an indoor heat exchanger, an outdoor heat exchanger, an indoor blower, an outdoor blower, etc. is configured, and the temperature of the outdoor heat exchanger is detected. a first temperature controller that detects an outdoor temperature and detects that the outdoor temperature is equal to or higher than a set temperature;
A second temperature regulator is provided to energize the temperature regulator,
Further, the first temperature controller has a first set temperature for detecting the temperature before overload of the outdoor heat exchanger, and a second set temperature for detecting the pre-freezing temperature lower than the first set temperature. A temperature is set, and the first temperature controller stops the outdoor fan when the temperature of the outdoor heat exchanger becomes higher than a first set temperature, and stops the outdoor fan when the temperature becomes lower than a second set temperature. Operation control device for air conditioners that operate.