CN108603706A - Air-conditioning device - Google Patents

Abstract

Air-conditioning device includes：Refrigerant circuit, the refrigerant circuit are flowed using piping connect compressor, flow path switching part, outdoor heat exchanger, bulge and indoor heat exchanger for refrigerant；And control unit, to switch heating operation and defrosting operating, control unit has for the action of the control unit control refrigerant circuit：Judging part, in the case where implementing heating operation, operation information of the judging part based on refrigerant circuit determines whether the beginning condition for changing defrosting operating；Change parts, judgement of the change parts based on judging part is as a result, change the beginning condition of defrosting operating；And switching part, in the case where the beginning condition of defrosting operating is satisfied, the switching part makes flow path switching part switch over to start defrosting operating.

Description

air conditioner

technical field

The present invention relates to an air conditioner for removing frost adhering to an outdoor heat exchanger.

Background technique

Conventionally, there is known an air conditioner having a refrigerant circuit in which a compressor, a flow switching unit, an outdoor heat exchanger, an expansion unit, and an indoor heat exchanger are connected by piping to form the refrigerant circuit. During heating operation, when the pressure saturation temperature of the outdoor heat exchanger functioning as an evaporator is not higher than the dew point temperature of outdoor air and not higher than the freezing point of water, frost adheres to the outdoor heat exchanger. When frost adheres to the outdoor heat exchanger, in the air conditioner, a defrosting operation is performed to remove the frost adhered to the outdoor heat exchanger, thereby suppressing the heat exchange performance of the outdoor heat exchanger due to the frosting phenomenon. decline.

In Patent Document 1, an air conditioner including an outdoor heat exchange temperature sensor, an outside air temperature sensor, and a human body detection sensor is disclosed. Patent Document 1 starts the defrosting operation when the output of the outdoor heat exchange temperature sensor and the output of the outside air temperature sensor satisfy the start condition of the defrosting operation, and furthermore, the human body detection sensor detects that no one is in the room. Accordingly, it is intended to suppress the defrosting operation when a person is present in the room, and maintain comfort.

prior art literature

patent documents

Patent Document 1: Japanese Patent Laid-Open No. 2011-185535

Contents of the invention

The problem to be solved by the invention

However, the conditions for starting the defrosting operation of the air conditioner disclosed in Patent Document 1 are not changed. Therefore, as long as someone is in the room, even if the start condition of the defrosting operation is satisfied, the defrosting operation will not be performed, and the heat exchange capacity of the outdoor heat exchanger will be reduced. In this way, Patent Document 1 cannot accurately determine whether or not to perform the defrosting operation.

The present invention is made to solve the above-mentioned problems, and provides an air conditioner with improved judgment accuracy in judging whether or not to perform a defrosting operation.

solutions to problems

The air conditioner of the present invention includes: a refrigerant circuit, the refrigerant circuit is connected to a compressor, a flow path switching unit, an outdoor heat exchanger, an expansion unit, and an indoor heat exchanger through piping, and the refrigerant flows; and a control unit, the control The control unit controls the operation of the above-mentioned refrigerant circuit to switch between the heating operation and the defrosting operation. The control unit has: a judging part. The starting condition of the defrosting operation; the changing part, the changing part changes the starting condition of the defrosting operation based on the judgment result of the judging part; and the switching part, when the starting condition of the defrosting operation is satisfied, the switching part uses The flow path switching unit switches to start the defrosting operation.

The effect of the invention

According to the present invention, the conditions for starting the defrosting operation are changed based on the determination result of the operation information. Therefore, it is possible to accurately determine whether to perform the defrosting operation.

Description of drawings

FIG. 1 is a circuit diagram showing an air conditioner 1 according to Embodiment 1 of the present invention.

FIG. 2 is a block diagram showing the control unit 30 of the air conditioner 1 according to Embodiment 1 of the present invention.

FIG. 3 is a flowchart showing the operation of the air conditioner 1 according to Embodiment 1 of the present invention.

FIG. 4 is a block diagram showing control unit 130 of air conditioner 100 according to Embodiment 2 of the present invention.

FIG. 5 is a block diagram showing control unit 230 of air conditioner 200 according to Embodiment 3 of the present invention.

FIG. 6 is a block diagram showing control unit 330 of air conditioner 300 according to Embodiment 4 of the present invention.

FIG. 7 is a flowchart showing the operation of the air conditioner 300 according to Embodiment 4 of the present invention.

Fig. 8 is a block diagram showing the control unit 430 of the air conditioner 400 according to Embodiment 5 of the present invention.

FIG. 9 is a flowchart showing the operation of the air conditioner 400 according to Embodiment 5 of the present invention.

Detailed ways

Implementation mode 1.

Hereinafter, embodiments of the air conditioner according to the present invention will be described with reference to the drawings. FIG. 1 is a circuit diagram showing an air conditioner 1 according to Embodiment 1 of the present invention. The air conditioner 1 will be described based on this FIG. 1 . As shown in FIG. 1 , an air conditioner 1 includes an outdoor unit 2 , an indoor unit 3 and a remote controller 4 . The outdoor unit 2 is installed outdoors, and has a compressor 6, a flow path switching unit 7, an outdoor heat exchanger 8, an outdoor blower 8a, an expansion unit 9, an outdoor temperature detection unit 21, an outdoor heat exchange temperature detection unit 22, and an outdoor control board 30a. . The indoor unit 3 is installed indoors, and has an indoor heat exchanger 10, an indoor blower 10a, an indoor temperature detection unit 23, a human body detection unit 24, and an indoor control board 30b. Here, the compressor 6 , the flow switching unit 7 , the outdoor heat exchanger 8 , the expansion unit 9 , and the indoor heat exchanger 10 are connected by piping to form a refrigerant circuit 5 through which the refrigerant flows. Moreover, the control part 30 is comprised by the outdoor control board|substrate 30a and the indoor control board|substrate 30b.

The compressor 6 compresses the refrigerant. The flow switching unit 7 switches the direction of the refrigerant flow in the refrigerant circuit 5 . The flow switching unit 7 switches the refrigerant discharged from the compressor 6 to flow to the outdoor heat exchanger 8 or to the indoor heat exchanger 10 to perform any one of cooling operation, heating operation, or defrosting operation. The outdoor heat exchanger 8 exchanges heat between the outdoor air and the refrigerant. The outdoor blower 8 a blows outdoor air to the outdoor heat exchanger 8 . The expansion unit 9 expands and decompresses the refrigerant, and is, for example, an electromagnetic expansion valve whose opening is adjusted. The indoor heat exchanger 10 exchanges heat between indoor air and refrigerant. The indoor blower 10 a blows indoor air to the indoor heat exchanger 10 .

The outdoor temperature detection unit 21 detects the outdoor temperature. The outdoor heat exchange temperature detector 22 detects the temperature of the outdoor heat exchanger 8 . The indoor temperature detection unit 23 detects the indoor temperature. The human body detection unit 24 detects the presence or absence of a human body. The outdoor control board 30 a controls each device of the outdoor unit 2 , and the indoor control board 30 b controls each device of the indoor unit 3 . The outdoor control board 30a and the indoor control board 30b are connected by an internal and external communication line 30c, and signals are transmitted and received via the internal and external communication line 30c.

The remote controller 4 is connected to the indoor control board 30b via the remote wire 4a, and transmits and receives signals to and from the indoor control board 30b via the remote wire 4a. For example, the remote controller 4 transmits a stop signal to stop the operation of the refrigerant circuit 5 to the indoor control board 30b. As a result, the indoor unit 3 and the outdoor unit 2 stop operating. In addition, the remote controller 4 transmits a start signal for starting the operation of the refrigerant circuit 5 to the indoor control board 30b. As a result, the indoor unit 3 and the outdoor unit 2 start operating.

FIG. 2 is a block diagram showing the control unit 30 of the air conditioner 1 according to Embodiment 1 of the present invention. Next, the control unit 30 will be described. In Embodiment 1, the control unit 30 is, for example, a CPU, and is composed of the outdoor control board 30a and the indoor control board 30b as described above, but the control unit 30 may also be a single control board. Either one of the outdoor unit 2 and the indoor unit 3 . In addition, the control unit 30 may be provided outside the outdoor unit 2 and the indoor unit 3 . As shown in FIG. 2 , the control unit 30 has a storage unit 31 , a determination unit 32 , a change unit 33 , and a switching unit 34 .

The storage unit 31 stores an outdoor heat exchange temperature threshold and the like required as a condition for starting the defrosting operation. When performing a heating operation in which the outdoor heat exchanger 8 functions as an evaporator, the defrosting operation is started on the condition that the temperature of the outdoor heat exchanger 8 is equal to or lower than the outdoor heat exchange temperature threshold. When the heating operation is performed for a long time, the pressure saturation temperature of the outdoor heat exchanger 8 functioning as an evaporator decreases. Furthermore, when the pressure saturation temperature of the outdoor heat exchanger 8 is not higher than the dew point temperature of the outdoor air and not higher than the freezing point of water, frost adheres to the outdoor heat exchanger 8 . When frost adheres to the outdoor heat exchanger 8, in the air conditioner 1, a defrosting operation is performed to remove the frost adhered to the outdoor heat exchanger 8, thereby suppressing damage to the outdoor heat exchanger 8 caused by the frosting phenomenon. Decrease in heat exchange performance. Also, in Embodiment 1, the start condition of the defrosting operation is a drop in the temperature of the outdoor heat exchanger 8 , but the present invention is not limited thereto, and may be a drop in the outdoor temperature or the like.

When the heating operation is being performed, the determination unit 32 determines whether to change the start condition of the defrosting operation based on the operation information of the refrigerant circuit 5 . In Embodiment 1, the operation information is the temperature detected by the outdoor temperature detection unit 21 . That is, the determination unit 32 determines whether or not the temperature detected by the outdoor temperature detection unit 21 is equal to or lower than the outdoor temperature threshold.

The changing unit 33 changes the start condition of the defrosting operation based on the judgment result of the judging unit 32 . In Embodiment 1, the operation information is the temperature detected by the outdoor temperature detection unit 21 . That is, when the determination unit 32 determines that the temperature detected by the outdoor temperature detection unit 21 is equal to or lower than the outdoor temperature threshold value, the change unit 33 changes the start condition of the defrosting operation.

As described above, in Embodiment 1, when performing a heating operation in which the outdoor heat exchanger 8 functions as an evaporator, the condition for starting the defrosting operation is that the temperature of the outdoor heat exchanger 8 is the temperature of the outdoor heat exchange. below the temperature threshold. When the heating operation is being performed, the changing unit 33 changes the outdoor heat exchange temperature threshold to an outdoor heat exchange temperature relaxation threshold higher than the outdoor heat exchange temperature threshold based on the operation information of the refrigerant circuit 5 . When the outdoor heat exchange temperature threshold is Thex1 and the outdoor heat exchange temperature relaxation threshold is Thex2, Thex1<Thex2. Accordingly, when the heating operation is performed and the temperature of the outdoor heat exchanger 8 is decreasing, the outdoor heat exchange temperature relaxation threshold Thex2 is reached before the outdoor heat exchange temperature threshold Thex1. That is, the outdoor heat exchange temperature relaxation threshold Thex2 eases the start condition of the defrosting operation compared with the outdoor heat exchange temperature threshold Thex1, and starts the defrosting operation earlier.

In this way, when it is determined that the temperature detected by the outdoor temperature detection unit 21 is equal to or lower than the outdoor temperature threshold, the outdoor heat exchange temperature threshold is changed to the outdoor heat exchange temperature relaxation threshold. Accordingly, when the outdoor temperature is low, it is judged that the possibility of frost adhering to the outdoor heat exchanger 8 is high, and the defrosting operation can be easily performed.

In addition, the changing means 33 also has a function of changing the start condition of the defrosting operation based on the detection result of the human body detection unit 24 . In Embodiment 1, when the heating operation is being performed, when the human body detection unit 24 detects that no one is in the room, the changing unit 33 changes the outdoor heat exchange temperature threshold value to a value higher than the outdoor heat exchange temperature threshold value. High outdoor heat exchange temperature moderation threshold. Accordingly, when no one is in the room, it is highly likely that the heating operation is judged not to be necessary, and the defrosting operation can be easily performed.

When the start condition of the defrosting operation stored in the storage means 31 is satisfied, the switching means 34 switches the flow path switching part 7 to start the defrosting operation. Here, when performing a heating operation in which the outdoor heat exchanger 8 functions as an evaporator, the defrosting operation is started on the condition that the temperature of the outdoor heat exchanger 8 is equal to or lower than the outdoor heat exchange temperature threshold. When the start condition of the defrosting operation is not changed by the changing member 33, when the temperature of the outdoor heat exchanger 8 detected by the outdoor heat exchange temperature detector 22 is below the outdoor heat exchange temperature threshold value, the switching member 34 makes the flow The path switching unit 7 performs the switching. In addition, when the start condition of the defrosting operation is changed by the changing means 33, when the temperature of the outdoor heat exchanger 8 detected by the outdoor heat exchange temperature detecting part 22 is equal to or lower than the outdoor heat exchange temperature relaxation threshold value, the switching means 34 causes the flow path switching unit 7 to switch.

In addition, the control unit 30 also performs the temperature sensor OFF and temperature sensor ON operations. This is to compare the actual room temperature U:i°C with the set temperature V:j°C to determine whether to continue the operation of the outdoor unit 2 and the indoor unit 3 . Here, the actual room temperature U is the temperature detected by the indoor temperature detection unit 23 . The set temperature V is a target room temperature set by a user or the like using the remote controller 4 . During the heating operation, when the actual room temperature U is equal to or higher than the set temperature V (i≥j), the control unit 30 composed of the outdoor control board 30a and the indoor control board 30b determines the heating capacity requested by the user. It is ensured, and the temperature sensor that temporarily stops the operation is turned off. At that time, the stopped indoor unit 3 sends a temperature sensor off signal to the control unit 30 .

In addition, the operation continues even when the temperature sensor is turned off. When the temperature sensor is turned off, when the actual room temperature U becomes lower than the set temperature V (i<j), the control unit 30 composed of the outdoor control board 30a and the indoor control board 30b judges that the temperature is controlled by the user. The heat capacity is insufficient, and the temperature sensor to restart the operation is turned on. At that time, the indoor unit 3 that has restarted its operation sends a temperature sensor ON signal to the control unit 30 .

Next, the operation modes of the air conditioner 1 will be described. The air conditioner 1 has cooling operation, heating operation, and defrosting operation as operation modes. In the cooling operation, the refrigerant flows through the compressor 6, the flow switching part 7, the outdoor heat exchanger 8, the expansion part 9, and the indoor heat exchanger 10 in sequence, and the indoor air and the refrigerant are heated at the indoor heat exchanger 10. Exchange and cool the indoor air. In the heating operation, the refrigerant flows through the compressor 6, the flow switching part 7, the indoor heat exchanger 10, the expansion part 9, and the outdoor heat exchanger 8 in sequence, and the indoor air and the refrigerant are exchanged at the indoor heat exchanger 10. The heat exchange heats the room air. In the defrosting operation, the refrigerant flows sequentially through the compressor 6 , the flow switching unit 7 , the outdoor heat exchanger 8 , the expansion unit 9 , and the indoor heat exchanger 10 to remove frost adhering to the outdoor heat exchanger 8 .

Next, the operation of each operation mode of the air conditioner 1 will be described. First, the cooling operation will be described. During the cooling operation, the refrigerant sucked into the compressor 6 is compressed by the compressor 6 and discharged in a high-temperature and high-pressure gas state. The high-temperature and high-pressure gaseous refrigerant discharged from the compressor 6 flows into the outdoor heat exchanger 8 through the flow path switching part 7, and exchanges heat with the outdoor air blown by the outdoor blower 8a at the outdoor heat exchanger 8 to be condensed and liquefied. . The condensed refrigerant in a liquid state flows into the expansion part 9, expands and decompresses in the expansion part 9, and becomes a gas-liquid two-phase state. Then, the refrigerant in the gas-liquid two-phase state flows into the indoor heat exchanger 10, exchanges heat with the indoor air at the indoor heat exchanger 10, and evaporates into gas. At this time, the indoor air is cooled and cooling is performed. The evaporated refrigerant in a gaseous state is sucked into the compressor 6 through the flow switching portion 7 .

Next, the heating operation will be described. During the heating operation, the refrigerant sucked into the compressor 6 is compressed by the compressor 6 and discharged in a high-temperature and high-pressure gas state. The high-temperature and high-pressure gaseous refrigerant discharged from the compressor 6 flows into the indoor heat exchanger 10 through the flow path switching part 7, and exchanges heat with the indoor air blown by the indoor blower 10a at the indoor heat exchanger 10 to be condensed and liquefied. . At this time, the indoor air is heated to perform heating. The condensed refrigerant in a liquid state flows into the expansion part 9, expands and decompresses in the expansion part 9, and becomes a gas-liquid two-phase state. Then, the refrigerant in the gas-liquid two-phase state flows into the outdoor heat exchanger 8, exchanges heat with the outdoor air at the outdoor heat exchanger 8, and evaporates into gas. The evaporated refrigerant in a gaseous state passes through the flow switching unit 7 and is sucked into the compressor 6 .

Next, the defrosting operation will be described. In the air conditioner 1 , frost may adhere to the outdoor heat exchanger 8 during heating operation. In order to remove this frost, a defrosting operation is performed. During the defrosting operation, the refrigerant sucked into the compressor 6 is compressed by the compressor 6 and discharged in a high-temperature and high-pressure gas state. The high-temperature, high-pressure gaseous refrigerant discharged from the compressor 6 flows into the outdoor heat exchanger 8 through the flow path switching unit 7 , and melts frost adhering to the outdoor heat exchanger 8 . Then, the refrigerant is condensed and liquefied by exchanging heat with the outdoor air in the outdoor heat exchanger 8 . The condensed refrigerant in a liquid state flows into the expansion portion 9 . At this time, the expansion part 9 is fully opened, and the refrigerant flows into the indoor heat exchanger 10 while maintaining a liquid state. Then, the refrigerant in a liquid state flows into the indoor heat exchanger 10, exchanges heat with indoor air at the indoor heat exchanger 10, and evaporates into gas. The evaporated refrigerant in a gaseous state passes through the flow switching unit 7 and is sucked into the compressor 6 .

FIG. 3 is a flowchart showing the operation of the air conditioner 1 according to Embodiment 1 of the present invention. Next, the operation of the control unit 30 of the air conditioner 1 according to Embodiment 1 will be described. As shown in FIG. 3 , when the heating operation is started, the determination unit 32 determines whether or not the temperature detected by the outdoor temperature detection unit 21 is equal to or lower than the outdoor temperature threshold (step ST1 ). When the temperature detected by the outdoor temperature detecting unit 21 is greater than the outdoor temperature threshold (NO in step ST1), it is determined that the temperature of the outdoor heat exchanger 8 detected by the outdoor heat exchange temperature detecting unit 22 is the outdoor heat. Below the exchange temperature threshold (step ST2). When the temperature of the outdoor heat exchanger 8 is equal to or lower than the outdoor heat exchange temperature threshold (YES in step ST2 ), the switching member 34 switches the flow path switching unit 7 to start the defrosting operation. On the other hand, when the temperature of the outdoor heat exchanger 8 is higher than the outdoor heat exchange temperature threshold ("No" in step ST2), it returns to step ST1.

Here, when the temperature detected by the outdoor temperature detection unit 21 is below the outdoor temperature threshold (YES in step ST1), the presence of a human body is detected by the human body detection unit 24 (step ST3). When a person is detected ("No" of step ST3), it progresses to step ST2. On the other hand, when no one is detected (YES in step ST3), the outdoor heat exchange temperature threshold is changed by the changing unit 33 to an outdoor heat exchange temperature relaxation threshold higher than the outdoor heat exchange temperature threshold, and it is judged that Whether or not the temperature of the outdoor heat exchanger 8 detected by the outdoor heat exchange temperature detection unit 22 is equal to or lower than the outdoor heat exchange temperature relaxation threshold (step ST4). When the temperature of the outdoor heat exchanger 8 is equal to or lower than the outdoor heat exchange temperature relaxation threshold (YES in step ST4 ), the flow switching unit 7 is switched by the switching member 34 to start the defrosting operation. On the other hand, when the temperature of the outdoor heat exchanger 8 is higher than the outdoor heat exchange temperature relaxation threshold ("No" in step ST4), the process returns to step ST1.

According to the first embodiment, the start condition of the defrosting operation is changed based on the determination result of the operation information. In the past, there is known an air conditioner in which the starting conditions of the defrosting operation are unchanged. As long as someone is in the room, even if the starting conditions of the defrosting operation are satisfied, the defrosting operation is not performed, and the heat exchange capacity of the outdoor heat exchanger 8 is reduced. decline. This makes it impossible to accurately determine whether or not to perform the defrosting operation. On the other hand, in Embodiment 1, since the start condition of the defrosting operation is changed based on the determination result of the operation information, it is possible to accurately determine whether or not to perform the defrosting operation. In addition, conventionally, there is known an air conditioner that judges the start of the defrosting operation only based on the presence or absence of people. When the temperature is high, the defrosting operation will occur repeatedly even when defrosting is not necessary, which may cause the room temperature to drop. In contrast, Embodiment 1 changes the start condition of the defrosting operation based on the determination result of the operation information, so that unnecessary defrosting operations, that is, unnecessary defrosting (Japanese: empty frosting り) can be suppressed from occurring repeatedly.

It also includes a human body detection unit 24 that detects the presence of a human body, and a change unit 33 that changes the start condition of the defrosting operation based on the determination result of the determination unit 32 and also based on the detection result of the human body detection unit 24 . As a result, the defrosting operation is actively performed when the heating capacity is unnecessary, such as when no one is present, within a range in which excessive defrosting does not occur frequently. Therefore, when someone is indoors, the user's comfort is not affected.

In addition, it also includes an outdoor heat exchange temperature detection unit 22, which detects the temperature of the outdoor heat exchanger 8, and the start condition of the defrosting operation is: the temperature detected by the outdoor heat exchange temperature detection unit 22 is When the outdoor heat exchange temperature threshold is lower than the outdoor heat exchange temperature threshold and the heating operation is being performed, the changing unit 33 changes the outdoor heat exchange temperature threshold to an outdoor heat exchange temperature relaxation threshold higher than the outdoor heat exchange temperature threshold based on the operation information of the refrigerant circuit 5 . Thus, by judging the temperature of the outdoor heat exchanger 8, it is possible to judge whether or not to defrost.

In addition, it also includes an outdoor temperature detection unit 21, which detects the outdoor temperature, the operation information is the temperature detected by the outdoor temperature detection unit 21, and the determination part 32 determines whether the temperature detected by the outdoor temperature detection unit 21 is When the temperature detected by the outdoor temperature detection unit 21 is determined by the determination unit 32 to be equal to or less than the outdoor temperature threshold, the changing unit 33 changes the start condition of the defrosting operation. In this way, by judging the outdoor temperature, it is possible to judge more accurately whether to perform defrosting.

Implementation mode 2.

FIG. 4 is a block diagram showing control unit 130 of air conditioner 100 according to Embodiment 2 of the present invention. Embodiment 2 differs from Embodiment 1 in that the operation information is the operation frequency of the compressor 6 . In the second embodiment, the same reference numerals as those in the first embodiment are attached to the same parts as those in the first embodiment, and description thereof will be omitted, and the differences from the first embodiment will be mainly described.

As shown in FIG. 4 , the air conditioner 100 includes a frequency detection unit 125 . The frequency detection unit 125 detects the operating frequency of the compressor 6 . In Embodiment 2, the operation information is the operation frequency detected by the frequency detection unit 125 . The determination unit 132 determines whether or not the operating frequency detected by the frequency detection unit 125 is equal to or greater than a frequency threshold. When the operating frequency of the compressor 6 is high, the amount of heat exchange in the outdoor heat exchanger 8 also increases, so it is estimated that the amount of frost on the outdoor heat exchanger 8 increases accordingly. In this way, when the operating frequency of the compressor 6 is high, it is determined that the possibility of frost adhering to the outdoor heat exchanger 8 is high. When the obtained operating frequency is determined to be equal to or greater than the frequency threshold, the changing unit 133 changes the outdoor heat exchange temperature threshold to an outdoor heat exchange temperature relaxation threshold higher than the outdoor heat exchange temperature threshold.

According to the second embodiment, the frequency detection unit 125 for detecting the operating frequency of the compressor 6 is further provided, the operating information is the operating frequency detected by the frequency detecting unit 125, and the determination unit 132 determines whether the operating frequency detected by the frequency detecting unit 125 is If the operating frequency detected by the frequency detection unit 125 is determined to be equal to or higher than the frequency threshold by the determining unit 132 , the changing unit 133 changes the start condition of the defrosting operation. In this way, even if the operating information is set to the operating frequency of the compressor 6, the same effect as that of the first embodiment can be obtained.

Implementation mode 3.

FIG. 5 is a block diagram showing control unit 230 of air conditioner 200 according to Embodiment 3 of the present invention. Embodiment 3 differs from Embodiments 1 and 2 in that the operation information is the operation time of the defrosting operation. In Embodiment 3, the same parts as Embodiments 1 and 2 are assigned the same reference numerals as Embodiments 1 and 2, and description thereof will be omitted, and the differences from Embodiments 1 and 2 will be mainly described.

As shown in FIG. 5 , the air conditioner 200 includes a time measuring unit 226 . The time measurement unit 226 measures the operation time of the defrosting operation. In Embodiment 3, the operation information is the operation time of the defrosting operation measured by the time measurement unit 226 . The determination means 232 determines whether or not the operation time of the previous defrosting operation measured by the time measurement part 226 is equal to or greater than a time threshold. When the operation time of the previous defrosting operation was long, it is presumed that the amount of frost on the outdoor heat exchanger 8 is still increasing at present. In this way, when the operation time of the previous defrosting operation is long, it is judged that the possibility of frost adhering to the outdoor heat exchanger 8 is high. When the operating time of the previous defrosting operation measured by the unit 226 is determined to be longer than the time threshold, the changing unit 233 changes the outdoor heat exchange temperature threshold to an outdoor heat exchange temperature relaxation threshold higher than the outdoor heat exchange temperature threshold.

According to the third embodiment, the time measurement unit 226 for measuring the operation time of the defrosting operation is further provided. Whether the operation time of the defrosting operation is more than the time threshold value, when the determination unit 232 determines that the operation time of the previous defrosting operation measured by the time measuring unit 226 is more than the time threshold value, the start of the defrosting operation is changed. condition. In this way, even if the operation information is set to the operation time of the defrosting operation, the same effect as that of Embodiments 1 and 2 can be obtained.

Implementation mode 4.

FIG. 6 is a block diagram showing control unit 330 of air conditioner 300 according to Embodiment 4 of the present invention. The fourth embodiment differs from the first embodiment in that the control unit 330 has a signal determination unit 335 . In Embodiment 4, the same parts as Embodiments 1 to 3 are denoted by the same reference numerals as Embodiments 1 to 3, and explanations thereof are omitted, and differences from Embodiments 1 to 3 are mainly focused. Be explained.

As shown in FIG. 6 , the control unit 330 has a signal judging unit 335 . The signal determination unit 335 allows the start of the defrosting operation when a stop signal is received from the remote controller 4 , and continues the heating operation when the stop signal is not received from the remote controller 4 . In Embodiment 4, the start condition of the defrosting operation is changed based on the temperature detected by the outdoor temperature detection unit 21 , which is the operation information, and not based on the detection result of the human body detection unit 24 .

In Embodiment 4, when the defrosting operation start condition is changed, the defrosting operation is put on standby even when the defrosting operation start condition is satisfied. Then, when the signal determining unit 335 receives the stop signal, the standby state of the defrosting operation is released, and the defrosting operation is started before the operation of the air conditioner 300 is stopped. On the other hand, when the stop signal is not received by the signal judging unit 335, the defrosting operation standby state is maintained, and the operation of the air conditioner 300 is stopped while maintaining this state.

FIG. 7 is a flowchart showing the operation of the air conditioner 300 according to Embodiment 4 of the present invention. Next, the operation of the control unit 330 of the air conditioner 300 according to Embodiment 4 will be described. As shown in FIG. 7 , when the heating operation is started, it is determined whether the temperature of the outdoor heat exchanger 8 detected by the outdoor heat exchange temperature detector 22 is equal to or lower than the outdoor heat exchange temperature threshold (step ST11 ). When the temperature of the outdoor heat exchanger 8 is equal to or lower than the outdoor heat exchange temperature threshold (YES in step ST11 ), the flow switching unit 7 is switched by the switching member 34 to start the defrosting operation.

On the other hand, when the temperature of the outdoor heat exchanger 8 is higher than the outdoor heat exchange temperature threshold ("No" in step ST11), the determination unit 32 determines whether the temperature detected by the outdoor temperature detection unit 21 is the outdoor temperature threshold. Hereafter (step ST12). When the temperature detected by the outdoor temperature detector 21 is greater than the outdoor temperature threshold (NO in step ST12), the signal judging unit 335 judges whether a stop signal has been received from the remote controller 4 (step ST13). When the stop signal is received (YES in step ST13), the operation of the air conditioner 300 is stopped. This is because the outdoor temperature is relatively high, so it is inferred that the outdoor heat exchanger 8 is not frosted. When the stop signal has not been received ("No" in step ST13), it returns to step ST11.

In step ST12, when the temperature detected by the outdoor temperature detection unit 21 is below the outdoor temperature threshold (YES in step ST12), the outdoor heat exchange temperature threshold is changed by the changing unit 33 to a ratio of the outdoor heat exchange temperature. For the higher outdoor heat exchange temperature relaxation threshold, it is determined whether the temperature of the outdoor heat exchanger 8 detected by the outdoor heat exchange temperature detection unit 22 is equal to or lower than the outdoor heat exchange temperature relaxation threshold (step ST14 ). When the temperature of the outdoor heat exchanger 8 is below the outdoor heat exchange temperature relaxation threshold (YES in step ST14), the signal judging unit 335 judges whether a stop signal has been received from the remote controller 4 (step ST15). When the stop signal is received (YES in step ST15 ), the flow path switching unit 7 is switched by the switching member 34 to start the defrosting operation. Then, the operation of the air conditioner 300 is stopped. When the stop signal has not been received ("No" in step ST15), it returns to step ST11. This is because the outdoor temperature is low, so it is presumed that the outdoor heat exchanger 8 may be frosted.

On the other hand, when the temperature of the outdoor heat exchanger 8 is greater than the outdoor heat exchange temperature relaxation threshold ("No" in step ST14), the signal judging part 335 judges whether a stop signal has been received from the remote controller 4 (step ST16) . When the stop signal is received (YES in step ST16), the operation of the air conditioner 300 is stopped. When the stop signal has not been received ("No" in step ST16), it returns to step ST11. The reason for this is that although the outdoor heat exchanger 8 is presumed to be frosted due to the low outdoor temperature, it is presumed that the user is attempting the heating operation because the stop signal has not been received.

According to Embodiment 4, the air conditioner 300 further includes a remote controller 4 that transmits a stop signal for stopping the operation of the refrigerant circuit 5, and the control unit 330 further includes a signal judging unit 335 that is automatically controlled by the remote controller 4. When the device 4 receives the stop signal, the start of the defrosting operation is permitted, and when the start of the defrosting operation is permitted by the signal judging part 335, the switching part 34 switches the flow path switching part 7 to start the defrosting operation. . As a result, when the user does not need the heating operation, the defrosting operation is actively performed, so that the heating capacity can be ensured when the heating operation needs to be resumed. Therefore, in addition to the effects obtained by the first embodiment, user comfort can also be improved.

In addition, in the fourth embodiment, like the first embodiment, the defrosting operation start condition may be changed based not only on the operation information but also on the detection result of the human body detection unit 24 . In addition, in Embodiment 4, the operation information may be the operation frequency of the compressor 6 as in Embodiment 2, or the operation information may be the operation time of the defrosting operation as in Embodiment 3.

Implementation mode 5.

Fig. 8 is a block diagram showing the control unit 430 of the air conditioner 400 according to Embodiment 5 of the present invention. Embodiment 5 differs from Embodiment 4 in that the permission of the defrosting operation is judged based on whether or not the signal judging unit 435 has received the temperature sensor OFF signal. In Embodiment 5, the same parts as Embodiments 1 to 4 are assigned the same reference numerals as Embodiments 1 to 4, and description thereof will be omitted, and differences from Embodiments 1 to 4 will be focused on. Be explained.

As shown in FIG. 8 , the control unit 430 has a signal judging unit 435 . The signal judging unit 435 allows the start of the defrosting operation when the temperature sensor off signal is received from the indoor unit 3, and continues the heating operation when the temperature sensor off signal is not received. In Embodiment 5, the start condition of the defrosting operation is changed based on the temperature detected by the outdoor temperature detection unit 21 , which is the operation information, and not based on the detection result of the human body detection unit 24 .

In Embodiment 5, when the defrosting operation start condition is changed, the defrosting operation is put on standby even when the defrosting operation start condition is satisfied. Then, when the signal judging unit 435 receives the temperature sensor OFF signal, the standby state for the defrosting operation is released, and the defrosting operation is started before the operation of the air conditioner 400 is stopped. On the other hand, when the temperature sensor OFF signal is not received by the signal judging unit 435 , the defrosting operation standby state is maintained, and the operation of the air conditioner 400 is stopped while maintaining this state.

FIG. 9 is a flowchart showing the operation of the air conditioner 400 according to Embodiment 5 of the present invention. Next, the operation of the control unit 430 of the air conditioner 400 according to Embodiment 5 will be described. As shown in FIG. 9 , when the heating operation is started, it is determined whether the temperature of the outdoor heat exchanger 8 detected by the outdoor heat exchange temperature detector 22 is equal to or lower than the outdoor heat exchange temperature threshold (step ST21 ). When the temperature of the outdoor heat exchanger 8 is equal to or lower than the outdoor heat exchange temperature threshold (YES in step ST21 ), the flow switching unit 7 is switched by the switching member 34 to start the defrosting operation.

On the other hand, when the temperature of the outdoor heat exchanger 8 is greater than the outdoor heat exchange temperature threshold ("No" in step ST21), the determination unit 32 determines whether the temperature detected by the outdoor temperature detection unit 21 is the outdoor temperature threshold. Hereafter (step ST22). When the temperature detected by the outdoor temperature detector 21 is greater than the outdoor temperature threshold (NO in step ST22), the signal judging unit 435 judges whether a temperature sensor off signal has been received from the indoor unit 3 (step ST23). When the temperature sensor OFF signal is received (YES in step ST23), the operation of the outdoor unit 2 and the indoor unit 3 is stopped. This is because the outdoor temperature is relatively high, so it is inferred that the outdoor heat exchanger 8 is not frosted. When the temperature sensor off signal has not been received ("No" in step ST23), it returns to step ST21.

In step ST22, when the temperature detected by the outdoor temperature detection unit 21 is below the outdoor temperature threshold (YES in step ST22), the changing unit 33 changes the outdoor heat exchange temperature threshold to a ratio of the outdoor heat exchange temperature. For the higher outdoor heat exchange temperature relaxation threshold, it is judged whether the temperature of the outdoor heat exchanger 8 detected by the outdoor heat exchange temperature detection unit 22 is equal to or lower than the outdoor heat exchange temperature relaxation threshold (step ST24). When the temperature of the outdoor heat exchanger 8 is below the outdoor heat exchange temperature relaxation threshold (YES in step ST24), the signal judging unit 435 judges whether a temperature sensor off signal has been received from the indoor unit 3 (step ST25). When the temperature sensor off signal is received (YES in step ST25), the flow path switching unit 7 is switched by the switching member 34, and the defrosting operation is started. Then, the operation of the outdoor unit 2 and the indoor unit 3 is stopped. When the temperature sensor OFF signal has not been received ("No" in step ST25), it returns to step ST21. This is because the outdoor temperature is low, so it is speculated that the outdoor heat exchanger 8 may be frosted.

On the other hand, when the temperature of the outdoor heat exchanger 8 is greater than the outdoor heat exchange temperature relaxation threshold ("No" in step ST24), the signal judging part 435 is used to judge whether the temperature sensor off signal has been received from the indoor unit 3 (step ST24). ST26). When the temperature sensor off signal is received (YES in step ST26), the operation of the outdoor unit 2 and the indoor unit 3 is stopped. When the temperature sensor OFF signal has not been received ("No" in step ST26), it returns to step ST21. The reason for this is that it is estimated that the outdoor heat exchanger 8 may be frosted because the outdoor temperature is low, but since the temperature sensor off signal is not received, it is estimated that the heating operation needs to be continued.

According to Embodiment 5, the control unit 430 further includes a signal judging part 435 which, when receiving a temperature sensor off signal that temporarily stops the temperature sensor off when the actual room temperature is higher than the set temperature, allows the When starting the defrosting operation described above, when the start of the defrosting operation is permitted by the signal judging unit 435 , the switching unit 34 switches the flow path switching unit 7 to start the defrosting operation. As a result, when the heating operation is unnecessary, the defrosting operation is actively performed, so that the heating capacity can be ensured when the heating operation is restarted by turning on the temperature sensor. Therefore, in addition to the effects obtained by the first embodiment, user comfort can also be improved.

In addition, in the fifth embodiment, as in the first embodiment, the defrosting operation start condition may be changed based not only on the operation information but also on the detection result of the human body detection unit 24 . In the fifth embodiment, the operating information may be the operating frequency of the compressor 6 as in the second embodiment, or the operating time of the defrosting operation as in the third embodiment.

Explanation of reference signs

1. Air conditioner; 2. Outdoor unit; 3. Indoor unit; 4. Remote control; 4a. Remote control line; 5. Refrigerant circuit; 6. Compressor; 7. Flow switching unit; 8. Outdoor heat exchanger; 8a. Outdoor blower; 9. Expansion unit; 10. Indoor heat exchanger; 10a. Indoor blower; 21. Outdoor temperature detection unit; 22. Outdoor heat exchange temperature detection unit; 23. Indoor temperature detection unit; 24. Human body detection unit ; 30, control unit; 30a, outdoor control substrate; 30b, indoor control substrate; 30c, internal and external communication lines; 31, storage component; 32, determination component; 33, change component; 34, switch component; , frequency detection part; 130, control part; 132, judging part; 133, changing part; 200, air conditioning device; 226, time measuring part; 230, controlling part; 330, the control unit; 335, the signal judging unit; 400, the air conditioner; 430, the control unit; 435, the signal judging unit.

Claims (8)

1. a kind of air-conditioning device, wherein

The air-conditioning device includes：

Refrigerant circuit, the refrigerant circuit utilize piping connect compressor, flow path switching part, outdoor heat exchanger, bulge And indoor heat exchanger, it is flowed for refrigerant；And

Control unit, the control unit controls the action of the refrigerant circuit, to switch heating operation and defrosting operating,

The control unit has：

Judging part, in the case where implementing the heating operation, fortune of the judging part based on the refrigerant circuit Transfering the letter breath, determines whether the beginning condition for changing the defrosting operating；

Change parts, judgement of the change parts based on the judging part is as a result, change the beginning item of the defrosting operating Part；And

Switching part, in the case where the beginning condition of the defrosting operating is satisfied, the switching part makes the stream Road switching part is switched over to start the defrosting operating.

2. air-conditioning device according to claim 1, wherein

The air-conditioning device further includes body detecting part, the presence or absence of described body detecting part's detection human body,

Judgement of the change parts based on the judging part as a result, and based on the testing result of the body detecting part, Change the beginning condition of the defrosting operating.

3. air-conditioning device according to claim 1, wherein

The air-conditioning device further includes remote controler, and the remote controler sends the stopping letter for making the operating of the refrigerant circuit stop Number,

Also there is the control unit signal judging part, the signal judging part to have received the stopping from the remote controler In the case of signal, allow the beginning of the defrosting operating,

In the case of allowing for the beginning of the defrosting operating in the signal judging part, the switching part makes the stream Road switching part is switched over to start the defrosting operating.

4. air-conditioning device according to claim 1, wherein

Also there is the control unit signal judging part, the signal judging part to compare set temperature in actual room temperature having received In the case of the temperature sensor shutdown signal that the temperature sensor temporarily ceased when high is closed, allow opening for the defrosting operating Begin,

In the case of allowing for the beginning of the defrosting operating in the signal judging part, the switching part makes the stream Road switching part is switched over to start the defrosting operating.

5. air-conditioning device according to any one of claim 1 to 4, wherein

The air-conditioning device further includes outdoor heat exchange temperature test section, and the outdoor heat exchange temperature test section detects the room The temperature of external heat exchanger,

The beginning condition of the defrosting operating is：The temperature detected using the outdoor heat exchange temperature test section is outdoor Heat exchange temperature threshold value hereinafter,

In the case where implementing the heating operation, operation information of the change parts based on the refrigerant circuit will The outdoor heat exchange temperature threshold value is changed to the outdoor heat exchange temperature higher than the outdoor heat exchange temperature threshold value and mitigates threshold Value.

6. air-conditioning device according to any one of claim 1 to 5, wherein

The air-conditioning device further includes outdoor temperature test section, the temperature outside outdoor temperature test section sensing chamber,

The operation information is the temperature detected using the outdoor temperature test section,

The temperature that judging part judgement is detected by the outdoor temperature test section whether be outdoor temperature threshold value hereinafter,

When being determined as that the temperature detected using the outdoor temperature test section is outdoor temperature threshold value in the judging part In the case of below, the change parts changes the beginning condition of the defrosting operating.

7. air-conditioning device according to any one of claim 1 to 5, wherein

The air-conditioning device further includes frequency detecting portion, and the operating frequency of the compressor is detected in the frequency detecting portion,

The operation information is the operating frequency detected using the frequency detecting portion,

Whether the operating frequency that the judging part judgement is detected by the frequency detecting portion is frequency threshold or more,

When the operating frequency detected using the frequency detecting portion is determined as frequency threshold or more in the judging part In the case of, the change parts changes the beginning condition of the defrosting operating.

8. air-conditioning device according to any one of claim 1 to 5, wherein

The air-conditioning device further includes time measurement portion, and the time measurement portion measures the duration of runs of the defrosting operating,

The operation information is the duration of runs measured using the time measurement portion,

Whether the duration of runs for the previous defrosting operating that the judging part judgement is measured by the time measurement portion More than time threshold,

When in the judging part by the duration of runs for the previous defrosting operating measured using the time measurement portion In the case of being determined as time threshold or more, the beginning condition of the defrosting operating is changed.