JPH07229662A - Dehumidifying operation controller for air conditioner - Google Patents

Abstract

PURPOSE:To switch start of dehumidifying operation of an outdoor heat exchanger at the time of heating according to an operating state of a compressor. CONSTITUTION:The dehumidifying operation controller for an air conditioner comprises temperature detecting means (temperature detector 1e, etc.) for detecting a temperature of an outdoor heat exchanger 1d, and deciding means (timer 1h, a deciding unit ..k, etc.) for deciding whether a compressor 1a at the time of heating is a continuous or intermittent operation. When the continuous operation is decided by the deciding means, a dehumidifying operation is started as a temperature of an outdoor heat exchanger becomes a dehumidifying starting temperature or lower at the time of predetermined continuous operation. When the intermittent operation is decided, the dehumidifying operation is started at a predetermined intermittent operation time dehumidifying starting temperature set to higher than the continuous operation time dehumidifying starting temperature. In both the operations, the dehumidifying operations are finished when the temperature of the outdoor heat exchanger is a predetermined dehumidifying finishing temperature or higher.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a defrosting operation control device for an air conditioner, and more particularly to control of a defrosting operation of an outdoor heat exchanger during heating operation.

[0002]

2. Description of the Related Art Conventionally, defrosting operation control of an air conditioner including an outdoor unit 1 and an indoor unit 2 shown in FIG. 1 has been performed as follows. FIG. 1 shows a heating operation state, in which the refrigerant from the compressor 1a is sent to the indoor heat exchanger 2a via the four-way valve 1b, and from the indoor heat exchanger 2a, a capillary tube 1c as a refrigerant throttle means and an outdoor heat exchanger. Compressor 1a through device 1d and four-way valve 1b
Return to. Further, the outdoor heat exchanger 1d is provided with a temperature detection unit 1e, and temperature data of the outdoor heat exchanger is sent to the control unit 1f. Then, when the temperature of the outdoor heat exchanger 1d becomes equal to or lower than a predetermined temperature (for example, −6 ° C.), the control unit 1f performs the defrosting operation. When this defrosting operation is started, for example, as shown in FIG. 1, the control unit 1f stops the operation of the indoor fan 2c via the indoor control unit 2b. This prevents the indoor unit 2 from being cooled. When the defrosting operation is started and the temperature of the outdoor heat exchanger 1d rises to a predetermined temperature (for example, + 10 ° C.), the operation is ended. Further, the operation stop of the indoor fan 2c is released. This returns to the original heating operation state.

[0003]

As described above, in the conventional defrosting operation during the heating operation, the temperature of the outdoor heat exchanger 1e, which is the reference for starting the operation, is constant (−6 ° C. in the above example). ). On the other hand, the state of frost attached to the outdoor heat exchanger 1d is different between the operating state of the compressor, that is, the case of continuous operation and the case of intermittent operation. In the case of continuous operation, it adheres in the frost state, but in the case of intermittent operation, the frost freezes and adheres in the state of ice. Therefore, in order to make the defrosting more reliable, it is necessary to change the reference for starting the defrosting operation depending on the operating state of the compressor. The present invention has been made from such a point of view, and an object of the present invention is to provide a control device that controls the defrosting operation according to the operating state of the compressor.

[0004]

According to the present invention, a temperature detecting means for detecting the temperature of the outdoor heat exchanger in the defrosting operation of the outdoor heat exchanger during the heating operation, and a compressor during the heating operation are provided. When a continuous operation or an intermittent operation is provided, a determination means is provided, and when the determination means determines the continuous operation, when the temperature of the outdoor heat exchanger falls below a predetermined continuous operation defrosting start temperature. When the defrosting operation is started, and when it is determined to be the intermittent operation, the temperature of the outdoor heat exchanger starts the defrosting operation at the predetermined intermittent operation defrosting start temperature,
Both of the operations provide a defrosting operation control device for an air conditioner in which the defrosting operation is terminated when the temperature of the outdoor heat exchanger is equal to or higher than a predetermined defrosting end temperature.

[0005]

Operation: Whether the compressor is in the continuous operation state or the intermittent operation state is determined by whether or not the predetermined reference time is exceeded (determination unit).
Therefore, a reference time serving as a discrimination reference is set in advance. On the other hand, the temperature detector detects the temperature of the outdoor heat exchanger,
The same temperature data is sent to the control unit. In the above determination, when the compressor is in the continuous operation state, the defrosting operation is started when the outdoor heat exchanger temperature becomes equal to or lower than the first temperature. In contrast,
When the compressor is in the intermittent operation state, it starts when the temperature becomes equal to or lower than the second temperature. The defrosting operation ends regardless of whether it is a continuous operation or an intermittent operation, and ends when the outdoor heat exchanger reaches a predetermined temperature.

[0006]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A defrosting operation control apparatus for an air conditioner according to the present invention will be described below with reference to the drawings. 1 is a block diagram of essential parts showing an embodiment of a defrosting operation control apparatus for an air conditioner according to the present invention, and FIG. 2 is an operation flowchart. The ST numbers in the following description indicate the steps in FIG. FIG. 1 shows a heating operation state (four-way valve 1b). The refrigerant from the compressor 1a is sent to the indoor heat exchanger 2a via the four-way valve 1b, and after the heat exchange processing in the indoor heat exchanger 2a, the refrigerant expansion means. To the outdoor heat exchanger 1d via the capillary tube 1c. The air required for the outdoor heat exchanger 1d is sent by the fan 1g. The refrigerant from the outdoor heat exchanger 1d returns to the compressor 1a via the four-way valve 1b.

On the other hand, the temperature of the outdoor heat exchanger 1d is determined by the temperature detection unit.
The temperature data is detected by 1e and is sent to the control unit 1f. The control unit 1f controls the compressor 1a and the fan 1g to perform required operation control. In addition to this, in the present invention, as shown in FIG. 1, a timer unit 1h for measuring the operating time of the compressor 1a,
The reference time for determining whether the compressor 1a is in the continuous operation state or the intermittent operation state, the first reference temperature related to the start of the defrosting operation, the second reference temperature related to the end of the defrosting operation, and the first reference temperature related to the end of the defrosting operation. Three
Memory unit 1j storing the reference temperature of the compressor and the compressor 1a
Is a continuous operation state, or an intermittent operation state, and a determination unit 1k that determines whether or not the temperature for starting or ending the defrosting operation is provided, and data transfer is performed according to the control of the control unit 1f. Done.

During heating operation, the control unit 1f controls the compressor 1a.
The operation is monitored and the determination unit 1k determines whether it is continuous operation or intermittent operation (ST1). This determination is performed by measuring the operation duration of the compressor 1a by the timer unit 1h and comparing the measured time with the reference time read from the memory unit 1j by the determination unit 1k. Then, when the continuous operation time of the compressor 1a exceeds the same reference time, it is determined to be continuous operation, and when it is shorter than the same reference time, it is determined to be intermittent operation. When it is determined that the operation is continuous (ST1-Y), the control unit 1f
Determines whether the temperature data of the outdoor heat exchanger 1d from the temperature detection unit 1e is lower than or equal to the first reference temperature T1 (memory unit 1j) (determination unit 1k) (ST2). Here, the first reference temperature T1 is the defrosting start temperature (for example, -8 ° C) when the compressor 1a is in the continuous operation state.

Therefore, when the temperature of the outdoor heat exchanger 1d is lower than or equal to the first reference temperature T1 (ST2-Y), the controller 1f starts the defrosting operation (ST3). The defrosting operation itself is the same as that described above (conventional technology), and the control unit 1f switches the four-way valve 1b to the cooling side (dotted line side in the figure) and stops the operation of the indoor fan 2b via the indoor control unit 2b. To do. As a result, the temperature of the outdoor heat exchanger 1d gradually rises, and the indoor unit 2 is prevented from entering the cooling operation. Subsequently, the control unit 1f monitors the temperature of the outdoor heat exchanger 1d (ST4), and when the temperature reaches the third reference temperature (ST4-Y), the defrosting operation ends (ST5).

Here, the third reference temperature is a temperature at which the defrosting operation ends. On the other hand, when the operation of the compressor 1a is the intermittent operation (ST1-N), the control unit 1f determines whether to start the defrosting operation based on the temperature of the outdoor heat exchanger 1d based on the second reference temperature. Monitor. The second reference temperature T2 is a defrosting start temperature when the operation of the compressor 1a is an intermittent operation, and is set higher than the first reference temperature T1 by a predetermined temperature. For example, when the first reference temperature T1 is "-8 ° C", the second reference temperature T2 is "-6 ° C" which is 2 ° C higher than this. The reason why the second reference temperature T2 is made higher than the first reference temperature T1 is to start the defrosting operation early in the case of intermittent operation and freeze the frost adhering to the outdoor heat exchanger 1e to become an ice state. This is to prevent this. In the above monitoring, when the temperature of the outdoor heat exchanger 1d becomes equal to or lower than the second reference temperature T2 (ST6-Y), the control unit 1f starts the defrosting operation (ST3). Hereinafter, the same operation as described above is performed.

[0011]

As described above, according to the present invention, the defrosting of the outdoor heat exchanger during the heating operation is switched depending on the operating state (continuous or intermittent) of the compressor. Efficient defrosting operation is possible and comfortable air conditioning can be performed. Thereby, the performance as an air conditioner can be improved.

[Brief description of drawings]

FIG. 1 is a block diagram of essential parts showing an embodiment of a defrosting operation control device for an air conditioner according to the present invention.

FIG. 2 is an operation flowchart for explaining FIG.

[Explanation of symbols]

 1 outdoor unit 1a compressor 1b four-way valve 1d outdoor heat exchanger 1e temperature detection unit 1f outdoor control unit 1h timer unit 1j memory unit 1k discriminating unit 2 indoor unit 2a indoor heat exchanger 2b indoor control unit

Claims (3)

[Claims] 1. In the defrosting operation of the outdoor heat exchanger during heating operation, the temperature detecting means for detecting the temperature of the outdoor heat exchanger and whether the compressor during the heating operation is continuous operation or intermittent operation. And a determining means for determining, the start of the defrosting operation when the temperature of the outdoor heat exchanger becomes equal to or lower than a predetermined continuous operation defrosting starting temperature when it is determined as the continuous operation, When it is determined to be the intermittent operation, the temperature of the outdoor heat exchanger starts the defrosting operation at the predetermined defrosting start temperature during the intermittent operation, and in any operation, the temperature of the outdoor heat exchanger is equal to or higher than the predetermined defrosting end temperature. A defrosting operation control device for an air conditioner, characterized in that the defrosting operation is terminated at. 2. The defrosting operation control device for an air conditioner according to claim 1, wherein the defrosting start temperature during intermittent operation is set higher than the defrosting start temperature during continuous operation by a predetermined temperature. 3. In the defrosting operation of the outdoor heat exchanger during the heating operation, whether the temperature detecting unit that detects the temperature of the outdoor heat exchanger and the compressor during the heating operation are continuous operation or intermittent operation. And the reference time that is the reference to determine
A first reference temperature as a temperature for starting the defrosting operation, a second reference temperature that is a predetermined temperature higher than the first reference temperature, and a third reference temperature as a temperature for ending the defrosting operation. A memory unit for respectively storing, a timer unit for measuring a continuous operation time of the compressor, a compressor continuous operation time from the timer unit and the reference time are compared, and the compressor is continuously operated during the heating operation. It is determined whether it is an operation or an intermittent operation, and the outdoor heat exchanger temperature from the temperature detection unit is compared with the required reference temperature to determine whether it is the temperature at which the defrosting operation starts or ends. An outdoor control unit that controls the defrosting operation by controlling the determination unit, the memory unit, the timer unit, and the determination unit, and when the compressor is in continuous operation, at the first reference temperature or lower. The defrosting operation is started, and the third
When the compressor is in the intermittent operation, the defrosting operation is started at a temperature equal to or higher than the reference temperature, and the defrosting operation is started at the second temperature or lower, and the defrosting operation is ended at the third temperature or higher. A defrosting operation control device for an air conditioner, which is characterized in that