JP2825945B2 - Air conditioner defrost control device - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a defrost control device for an air conditioner.

2. Description of the Related Art A conventional defrost control device for an air conditioner will be described with reference to the drawings.

FIG. 3 is a book diagram of a conventional defrost control device for an air conditioner. First, 1 is an outside air temperature sensor for detecting the outside air temperature, 2 is an outdoor pipe temperature sensor for detecting the pipe temperature of outdoor air (not shown), and 3 is an operation time integrating device for integrating and detecting the heating operation time. It is. Reference numeral 4 denotes a control device that controls defrosting according to a command from the outside air temperature sensor 1, the outdoor pipe temperature sensor 2, and the operation time integrating device 3, and is configured by these. Here, the control device 4 sets the heating operation time and the outdoor pipe temperature in advance in accordance with the outside air temperature, and the air conditioner starts the defrosting operation when each reaches a predetermined value.

Problems to be Solved by the Invention However, in such an air conditioner defrost control device, the heating operation time is determined by the outside air temperature and the outdoor pipe temperature, and the defrosting is not performed until a predetermined time elapses. Even if the capacity is insufficient due to frosting, heating operation is performed, so there is a lot of frosting, long defrosting time, extremely low room temperature, discomfort, and it takes a long time to reach the set room temperature. there were.

The present invention has been made in view of the above problems, and provides a defrosting control device for an air conditioner that can perform comfortable defrosting without performing a defrosting operation properly and reducing the room temperature.

Means for Solving the Problems In order to solve the above problems, a defrosting control device for an air conditioner according to the present invention includes a room temperature sensor for detecting an indoor temperature, an indoor temperature setter for setting an indoor temperature, and the room temperature sensor. A temperature difference detecting device for detecting a temperature difference between the detected temperature of the room and the set temperature of the indoor temperature setting device, an operation time integrating device for detecting a heating operation time from the start of a recent heating operation to the present time, and after completion of defrosting. Setting a heating operation time based on the detection result of the hot air blowing time detecting device and the detection result of the hot air blowing time detecting device, and detecting the warm air blowing start time. An air control device that starts a defrosting operation of the air conditioner when the detection time of the integrating device reaches the previously set heating operation time, and the air conditioning control device includes:
The configuration is such that the heating operation time is set shorter as the warm air blowing start time after the completion of the defrosting is longer and shorter as the temperature difference between the detected temperature of the room temperature sensor and the set temperature of the indoor temperature setting device is larger. .

The defrost control device for an air conditioner according to the present invention is configured such that the air-conditioning control device uses the temperature difference between the detected temperature of the room temperature sensor and the set temperature of the indoor temperature setting device, and the hot air blowing start time after defrosting is completed. The heating operation time is set, and when the heating operation time from the start of the latest heating operation to the present time reaches the heating operation time set by the air conditioning control device, the defrosting operation of the air conditioner is started. The heating operation time is set shorter as the warm air blowing start time after completion of defrosting is longer and shorter as the temperature difference between the detected temperature of the room temperature sensor and the set temperature of the indoor temperature setting device is higher. Done properly. When the defrosting operation is performed properly, frost formation is small, and there is no possibility of insufficient capacity or long defrosting time due to frost formation. Therefore, a decrease in room temperature can be prevented.

Embodiment Hereinafter, a defrost control device for an air conditioner according to an embodiment of the present invention will be described with reference to the drawings.

FIG. 1 is a block diagram of a defrost control device for an air conditioner according to an embodiment of the present invention. In FIG. 1, 5 is a room temperature sensor for detecting the room temperature, and 6 is a room temperature setter for setting the room temperature. 7 is a room temperature sensor 5
Is a temperature difference detecting device for detecting a temperature difference between the detected temperature of the above and the set temperature of the room temperature setting device 6. Reference numeral 8 denotes an operation time integrating device for detecting a heating operation time from the start of a recent heating operation to the present time, and reference numeral 9 denotes a hot air blowing time detecting device for detecting a room temperature blowing start time after the completion of defrosting. Reference numeral 10 denotes an outside air temperature sensor that detects an outside air temperature, and 11 denotes an outdoor pipe temperature sensor that detects a pipe temperature of an outdoor unit (not shown). 12 sets the heating operation time based on the detection result of the temperature difference detection device 7 and the detection result of the hot air blowing time detection device 9, and the detection time of the operation time integration device 8 reaches the heating operation time set earlier. This is an air control device that starts the defrosting operation of the air conditioner when it is performed. Note that the room temperature setting device 6 of the room temperature sensor 5 is electrically connected to the temperature difference detection device 7,
The operating time integrating device 8, the hot air blowing time detecting device 9, the outside air temperature sensor 10, and the outdoor pipe temperature sensor 11 are electrically connected to the air conditioning control device 12.

The operation of the defrost control device for an air conditioner configured as described above will be described below with reference to FIGS. FIG. 2 is a flowchart showing the operation of the air conditioner defroster according to one embodiment of the present invention. First, when the heating operation switch of the air conditioner is turned on, step 1
Branch to YES and proceed to step 2. At the start of the heating operation, since the defrosting operation is not performed, step 2 is branched to the NO side, and the process proceeds to step 3. At the start of the heating operation, since there is no history of the defrosting operation, step 3 is branched to NO and the process proceeds to step 4. In step 4, the air-conditioning control device 12 acquires the respective detected temperatures from the outside air temperature sensor 10 and the outdoor pipe temperature sensor 11, and in the next step 5, the air control device 12 acquires the heating operation time from the operation time integrating device 8, Proceed to the next step 6. At the start of the heating operation, the combination of the detected temperature taken from the outside air temperature sensor 10 and the outdoor pipe temperature sensor 11 and the heating operation time taken from the operation time integrating device 8 does not satisfy the defrost start condition, The control device 12 does not issue a defrosting start command. Therefore, step 6 is branched to the NO side, and in the next step 7, the air conditioner performs the heating operation by the air conditioning controller 12, and returns to step 1. After the heating operation is continued for a while, frost forms on the outdoor unit, and the combination of the detected temperature taken from the outside air temperature sensor 10 and the outdoor pipe temperature sensor 11 and the heating operation time taken from the operation time integrating device 8 starts defrosting. When the condition is satisfied, the air conditioning control device 12 issues a defrosting start command. Therefore, when proceeding to step 6, step 6 is branched to the YES side, and in the next step 8, the air conditioner performs the defrosting operation by the air conditioning controller 12, and returns to step 1. This time, since the defrosting operation is being performed, when proceeding to step 2, step 2 is branched to the YES side, and in the next step 9, the detected temperature from the outdoor pipe temperature sensor 11 is taken in, and then to the next step 10. move on. When the defrosting operation has just started, the detected temperature from the outdoor pipe temperature sensor 11 does not satisfy the defrost end condition, and the air conditioning control device 12 does not issue a defrost end command. Therefore, step 10 is branched to the NO side, and the process proceeds to the next step 8. Since the defrosting operation is being performed this time, step 8
Then, the air conditioner continues the defrosting operation and returns to step 1.
If the defrosting operation is continued for a while, the outdoor unit will be free of frost,
The temperature detected by the outdoor pipe temperature sensor 11 satisfies the defrost end condition, and the air conditioning control device 12 issues a defrost end command. Therefore, when proceeding to step 10, step 10 is branched to the YES side, and in the next step 11, the air conditioner ends the defrosting operation by the air conditioning controller 12, and performs the heating operation. In the next step 12, the air conditioning controller 12 detects the start time of the hot air blowout after the completion of the defrosting by the hot air blowout time detecting device 9, and in the next step 13, the air control device 12 detects the detected temperature of the room temperature sensor 5. And the set temperature of the room temperature setting device 6, and the next step
Proceed to 14. When there is no history of the defrosting operation or when the previous defrosting operation has been sufficiently defrosted, the start time of the hot air blowing after the defrosting is completed is less than 4 minutes. Then, proceed to the next step 15. When there is no history of the defrosting operation or when the previous defrosting operation has been sufficiently defrosted, the difference between the set temperature of the room temperature setter 6 and the detected temperature of the room temperature sensor 5 is less than 2 ° C. 15 is branched to the NO side, and the process proceeds to the next step 16. If the process proceeds to step 16, the heating operation time is set to 75 minutes, and the process returns to step 1. Since the heating operation is being performed this time, when the process proceeds to step 2, step 2 is branched to the NO side and the process proceeds to step 3. This time, since there is a history of the defrosting operation, step 3 is branched to the YES side, and the process proceeds to the next step 6. At this time, if the detection time of the operation time integrating device 8 has not reached the heating operation time set by the air conditioning control device 12, the air conditioning control device 12 has not issued the defrosting start command, and thus the step 6 is branched to the NO side. Then, proceed to the next step 7. This time, since the heating operation is being performed, the air conditioner continues the heating operation and returns to step 1. Eventually, the detection time of the operation time integrating device 8 reaches the heating operation time set by the air conditioning control device 12, and the air conditioning control device
When 12 issues a defrosting start command, when proceeding to step 6, step 6 is branched to the YES side. In the next step 8, the air conditioner performs defrosting operation by the air conditioning control device 12, and proceeds to step 1. Return. When the defrosting operation has not been sufficiently performed in the previous defrosting operation, the difference between the set temperature of the room temperature setting device 6 and the detected temperature of the room temperature sensor 5 becomes 2 ° C. or more. Branch to YES side, next step 1
Go to 7. If you proceed to step 17, set the heating operation time to 60
Set to minutes and return to step 1. After the defrosting is completed, if the previous defrosting operation has not been sufficiently defrosted so that it takes more than 4 minutes to start blowing hot air, the process proceeds to skip 14 and branches to step 14 to the YES side. Then, proceed to the next step 18. When the process proceeds to step 18, the heating operation time is set to 45 minutes, and the process returns to step 1.

As described above, according to the present embodiment, the warm air blowing time after the completion of defrosting is detected, and the longer the warm air blowing time is, the shorter the warm air blowing time is and the shorter the temperature difference is, the shorter the warm air blowing time is, according to the temperature difference between the room temperature and the set room temperature. By setting the heating operation time and determining the next defrost start condition, it is possible to obtain defrost control capable of realizing comfortable air conditioning in consideration of the air load and the frost formation state of the device.

Effect of the Invention As described above, in the air conditioner defrost control device of the present invention, the air control device determines whether the temperature difference between the detected temperature of the room temperature sensor and the set temperature of the indoor temperature setting device and the hot air blowing after defrosting is completed. The heating operation time is set based on the delivery start time and the defrosting operation of the air conditioner is started when the heating operation time from the latest heating operation start to the current time reaches the heating operation time set by the air control device. The air control device sets the heating operation time shorter as the warm air blowing start time after the end of defrosting is longer and shorter as the temperature difference between the detected temperature of the room temperature sensor and the set temperature of the indoor temperature setting device is larger. Therefore, the defrosting operation is appropriately performed. When the defrosting operation is performed properly, frost formation is small, and there is no possibility of insufficient capacity or long defrosting time due to frost formation. Therefore, a decrease in room temperature can be prevented, and comfortable air conditioning can be realized.

[Brief description of the drawings]

FIG. 1 is a block diagram of a defrost control device for an air conditioner in one embodiment of the present invention, FIG. 2 is a flowchart showing the operation of one embodiment of the present invention, and FIG. It is a block diagram of a frost control device. 5 room temperature sensor, 6 room temperature setting device, 7 temperature difference detection device, 8 operation time integration device, 9 hot air blowing time detection device, 12 air conditioning control device.

Claims (1)

(57) [Claims] 1. A room temperature sensor for detecting a room temperature, a room temperature setting device for setting a room temperature, and a temperature difference detecting device for detecting a temperature difference between a detected temperature of the room temperature sensor and a set temperature of the room temperature setting device. An operation time integrating device for detecting a heating operation time from the start of a recent heating operation to the present time, a hot air blowing time detecting device for detecting a hot air blowing start time after completion of defrosting, and a detection of the temperature difference detecting device. The heating operation time is set based on the result and the detection result of the hot air blowing time detection device, and the defrosting of the air conditioner is performed when the detection time of the operation time integration device reaches the previously set heating operation time. The air-conditioning control device is configured to start operation, the air-conditioning control device is configured such that the longer the warm air blowing start time after the end of defrosting is, the shorter the time is, and the temperature between the detected temperature of the room temperature sensor and the set temperature of the room temperature setter. The larger the difference, the shorter the warm Defrosting control device for an air conditioner and sets the operation time.