JP6692690B2 - Defrost control device, air conditioner - Google Patents

Description

  The present invention relates to a defrosting control device that controls a defrosting operation for thawing a frozen heat exchanger of an outdoor unit in an air conditioner.

  Generally, as an air conditioner, for example, in an air conditioner, when a heat exchanger of an outdoor unit is frozen during heating operation, a defrosting operation is performed to thaw the frozen heat exchanger. However, with the defrosting operation, the following problems (1) to (3) occur, for example.

  (1) During the defrosting operation, the heating operation is temporarily stopped in order to circulate the refrigerant in the direction opposite to that during heating in order to thaw the frozen heat exchanger. Therefore, during the defrosting operation, the room temperature may be lower than the set temperature, and the sensible temperature of the person in the room may be reduced.

  (2) Since the heating operation is stopped during the defrosting operation, the fan of the indoor unit also stops. However, from the start of defrosting until the indoor fan is completely stopped, weak cold air is blown out from the air outlet of the indoor unit. Therefore, during the defrosting operation, the sensible temperature of the person in the room may further decrease.

  (3) At the end of the defrosting operation (between the end of the defrosting operation and the restart of the heating operation), the refrigerant flows with the indoor fan stopped. The sound may leak from the room and may be heard inside the room, which may be uncomfortable for people in the room.

  Therefore, in order to solve the above problem (1), in Patent Documents 1 and 2, by temporarily raising the room temperature to a predetermined temperature before the defrosting operation, it is possible for a person who is inside the room to perform the defrosting operation. A technique for making it difficult to feel cold is disclosed.

  In addition, in order to solve the problem (2), in Patent Document 3, when the heating operation starts or the defrosting operation starts, the direction of the cold air blown from the air outlet of the indoor unit is changed by the wind direction plate, and There is disclosed a technique of reducing the cold wind hitting the person who is present and reducing the reduction in the sensible temperature.

  Further, in order to solve the above-mentioned problem (3), Patent Document 4 discloses a technique for making it difficult to hear the sound of the refrigerant flowing from the outlet by closing the outlet of the indoor unit during the defrosting operation. It is disclosed.

JP, 2010-96474, A (published on April 30, 2010) JP-A-2015-42922 (Published March 5, 2015) Japanese Patent Laid-Open No. 10-26386 (Published January 27, 1998) JP-A-8-189686 (Published July 23, 1996)

  However, the techniques disclosed in Patent Documents 1 to 4 only solve some of the various problems that occur during defrosting operation, and all the problems (1) to (3) described above are solved. It has not been resolved. That is, in the conventional technique, during defrosting operation, a person who is indoors feels a decrease in the sensible temperature, or at the end of defrosting operation, the sound of the refrigerant is heard, which causes discomfort. Occurs.

  The present invention has been made in view of the above problems, and an object thereof is to make it difficult for a user to feel a decrease in sensible temperature during defrosting operation, and to make it difficult to hear the sound of refrigerant flowing at the end of defrosting operation. An object of the present invention is to provide a defrost control device capable of performing the defrosting control.

  In order to solve the above problems, a defrost control device according to an aspect of the present invention controls a defrost operation for defrosting a frozen heat exchanger of an outdoor unit included in an air conditioner. In the heating operation of the air conditioner, when a start request signal requesting the start of the defrosting operation is received from the outdoor unit, the heating control is performed so that the room temperature rises from a set temperature to a preset temperature. After that, the defrosting permission signal for permitting the defrosting operation is transmitted to the outdoor unit, and the blowing direction of the indoor unit is closed by the wind direction changing member or the direction of the wind blown from the blowing port is in a direction other than the front direction. It is characterized in that it is provided with a defrosting operation control unit for changing to.

  In order to solve the above problems, a defrost control device according to an aspect of the present invention controls a defrost operation for defrosting a frozen heat exchanger of an outdoor unit included in an air conditioner. In the heating operation of the air conditioner, when a start request signal requesting the start of the defrosting operation is received from the outdoor unit, the heating control is performed so that the room temperature rises from a set temperature to a preset temperature. After sending the defrosting permission signal to permit the defrosting operation to the outdoor unit, and when the defrosting operation end signal is received from the outdoor unit, the fan for blowing out the air in the indoor unit is heated. It is characterized in that it is provided with a defrosting operation control unit for rotating in a direction opposite to the rotating direction at the time.

  In order to solve the above problems, a defrost control device according to an aspect of the present invention controls a defrost operation for defrosting a frozen heat exchanger of an outdoor unit included in an air conditioner. In the heating operation of the air conditioner, when a start request signal requesting the start of the defrosting operation is received from the outdoor unit, the heating control is performed so that the room temperature rises from a set temperature to a preset temperature. After that, the defrosting permission signal for permitting the defrosting operation is transmitted to the outdoor unit, and the wind direction changing member closes the air outlet of the indoor unit or blows the air from the air outlet in a direction other than the front direction. When a change is received and a signal of the defrosting operation end is received from the outdoor unit, a defrosting operation control unit that rotates the fan for blowing out the air of the indoor unit in the opposite direction to the rotation direction during the heating operation is provided. Is characterized by.

  Advantageous Effects of Invention According to one aspect of the present invention, it is possible to make it difficult to sense a decrease in the body temperature during defrosting operation and to make it difficult to hear the sound of the refrigerant flowing at the end of defrosting operation.

It is a control block diagram of the air conditioner concerning Embodiment 1 of the present invention. It is a perspective view of the indoor unit of the air conditioner of the present invention. It is a schematic sectional drawing of an indoor unit when a wind guide panel is closed. It is a schematic sectional drawing of an indoor unit when a wind guide panel opens upwards. It is a schematic sectional drawing of an indoor unit when a wind guide panel opens below. It is a flowchart which shows the flow of the process before defrosting start in the defrosting control apparatus of the air conditioner shown in FIG. It is a flow chart which shows a flow of processing at the time of a defrosting operation in a defrosting control device of an air harmony machine shown in Drawing 1. It is a graph which shows the time-dependent change of room temperature before and after defrosting operation.

[Embodiment 1]
Hereinafter, embodiments of the present invention will be described in detail. In this embodiment, a separate type air conditioner, which is divided into an indoor unit and an outdoor unit, will be described as the air conditioner. That is, as shown in FIG. 1, the air conditioner according to the present embodiment includes an indoor unit (indoor unit) 101 and an outdoor unit (outdoor unit) 102. The refrigerant is circulated between the indoor unit 101 and the outdoor unit 102.

(Outline of indoor unit)
FIG. 2 shows the appearance of the indoor unit (indoor unit) 101 of the air conditioner, and FIGS. 3 to 5 show schematic cross sections of the indoor unit 101.

  The indoor unit 101 includes a heat exchanger 1 and an indoor fan (fan) 2, which are installed in a cabinet 3. The cabinet 3 is formed in a box shape having a depth longer than the height, and has a curved surface from the front surface to the bottom surface. A suction port 4 is formed on the upper surface of the cabinet 3, and an air outlet 5 is formed on the curved surface.

  Inside the cabinet 3, an air passage 6 extending from the suction port 4 to the air outlet 5 is formed, and the heat exchanger 1 and the indoor fan 2 are arranged in the air passage 6. A filter 7 is arranged between the suction port 4 and the heat exchanger 1 to remove dust from the indoor air sucked from the suction port 4. A cleaning device 8 for cleaning the filter 7 is provided. From the air outlet 5, the air (warm air or cold air) heat-exchanged by the heat exchanger 1 is blown out.

  The cleaning device 8 moves the filter 7 in the cabinet 3 to pass through the dust removing unit 9, and removes the dust adhering to the filter 7 in the dust removing unit 9. A guide path 10 that is curved in a U shape in a side view is formed on the front side in the cabinet 3, and a moving portion including a motor and a gear moves the filter 7 back and forth along the guide path 10. In the dust removing unit 9, the rotating brush 11 scrapes off the dust from the filter 7 passing therethrough, and the suction fan blows air in a direction substantially parallel to the filter 7 (left-right direction) to suck and discharge the scraped dust. To do.

  The curved surface of the cabinet 3 is provided with an air guide panel (air direction changing member) 20 that opens and closes the air outlet 5. As shown in FIGS. 4 and 5, the wind guide panel 20 is capable of opening and closing both upward and downward, and is provided with an opening / closing mechanism for opening and closing the wind guide panel 20.

  The wind guide panel 20 is formed by one curved panel, and the width of the wind guide panel 20 is the same as the width of the cabinet 3 and larger than the width of the blowout port 5. A front panel 21 is formed on the front surface of the cabinet 3 so as to be lowered by one step from the middle portion of the front surface to the bottom surface. Thereby, a recess is formed in the entire width direction, and the air guide panel 20 is fitted in the recess. An opening is formed in the front panel 21 forming the concave portion, and this opening is the air outlet 5. Therefore, the wind guide panel 20 is located in front of the air outlet 5, and covers the air outlet 5 and the front panel 21 around the air outlet 5. At this time, the wind guide panel 20 is in the closed posture shown in FIG.

  In the closed posture, gaps are formed between the front and rear ends of the wind guide panel 20 and the cabinet 3. As shown in FIGS. 4 and 5, when the air guide panel 20 is opened and closed, the ends of the air guide panel 20 enter this gap. The wind guide panel 20 can smoothly rotate without hitting the cabinet 3. Further, in the upper opening or the lower opening, when the baffle panel 20 is opened to the maximum, the front and rear ends of the baffle panel 20 are formed so that the baffle panel 20 comes into contact with the cabinet 3. Prevents the wind from leaking. Especially in the case of cold air, it is possible to prevent dew condensation on the bottom surface side of the cabinet 3.

  Thus, the outer surface of the wind guide panel 20 forms a smooth curved surface from the front surface to the bottom surface of the cabinet 3. That is, the wind guide panel 20 serves as a member forming a part of the front surface of the cabinet 3. In other words, a part of the panel of the cabinet 3 is used as the wind guide panel 20. As a result, the wind guide panel 20 becomes a long panel whose overall length is longer than that of a louver used in a conventional air conditioner.

  The wind guide panel 20 opens in either the upper or lower direction by rotating in different directions about the upper and lower shafts. As shown in FIG. 5, the wind guide panel 20 opens downward around the lower shaft 22 during the cooling operation. In this downward-opening posture, the wind guide panel 20 is connected to the lower wall of the air outlet 5, and the long nozzle is formed by the air guide panel 20 and the upper wall of the air outlet 5. The wind guide panel 20 guides the cool air obliquely upward and blows the cool air along the ceiling.

  As shown in FIG. 4, it opens upward around the upper shaft 23 during the heating operation. In this upward open posture, the wind guide panel 20 shields the front of the air outlet 5 and suppresses the warm air blown toward the front to guide the warm air toward the floor. Even in the initial stage of the cooling operation, the wind guide panel 20 is in the upward open posture, and the cool air is blown toward the floor surface to perform the rapid cooling. As shown in FIG. 2, the wind guide panel 20 is in a closed posture when the operation is stopped, covers the air outlet 5 and is integrated with the cabinet 3. In this way, the wind guide panel 20 closes the air outlet 5 and takes the closed posture not only when the operation is stopped but also when the defrosting operation described later is performed. In addition, the closed posture of the wind guide panel 20 during the defrosting operation is not limited to the posture in which the air outlet 5 is completely closed, but the direction of the air blown out from the air outlet 5 is not in the front direction such as below the indoor unit 101. Including the attitude to change to. The drive mechanism of the wind guide panel 20 is composed of the indoor unit control device 41 and the opening / closing motor 24 shown in FIG. Hereinafter, the details of the indoor unit control device 41 will be described.

(Air conditioner control block)
FIG. 1 shows a control block of the air conditioner according to the present embodiment. The indoor unit 101 includes an indoor unit control device 41, and the outdoor unit 102 includes an outdoor unit control device 51. The indoor unit control device 41 and the outdoor unit control device 51 constitute a defrost control device.

  The indoor unit control device 41 includes an indoor temperature detected by the indoor temperature sensor 42, an indoor heat exchange temperature of the indoor heat exchanger 1 detected by the indoor heat exchange temperature sensor 43, and a remote control by a person who is in the room (Fig. The open / close motor 24 for opening and closing the indoor fan 2 and the air guide panel 20 is driven according to the operation mode by operation (not shown) and the setting contents of the room temperature, and a control signal is output to the outdoor unit control device 51.

  The indoor unit control device 41 includes a defrosting operation control unit 41a for controlling the defrosting operation time. Details of the control by the defrosting operation control unit 41a will be described later.

  The outdoor unit control device 51, based on the control signal output from the indoor unit control device 41, the outdoor air temperature detected by the outdoor air temperature sensor 52 and the outdoor heat exchanger 34 detected by the outdoor heat exchange temperature sensor 53. The outdoor fan 31, the compressor 32, and the four-way valve 33 are driven while referring to the outdoor heat exchange temperature.

  The outdoor unit control device 51 includes a defrosting operation determination unit 51a that determines whether or not a defrosting operation should be performed, and a defrosting operation execution unit 51b that executes the defrosting operation. The details of the determination process performed by the defrosting operation determination unit 51a and the details of the defrosting operation process performed by the defrosting operation execution unit 51b will be described later.

(Defrosting operation control: processing before the start of defrosting)
FIG. 6 is a flowchart showing a flow of processing before defrosting start in defrosting operation control. The following processing is performed by the defrosting operation control unit 41a of the indoor unit control device 41 and the defrosting operation determination unit 51a of the outdoor unit control device 51.

  First, when the heating operation is started in step S11, the defrosting operation determination unit 51a determines whether or not the defrosting operation is necessary (step S12). Specifically, the defrosting operation determination unit 51a determines whether or not the defrosting operation is necessary based on the temperatures detected by the outside air temperature sensor 52 and the outdoor heat exchange temperature sensor 53 during the heating operation. Here, when the outside air temperature sensor 52 is below a predetermined temperature and the temperature detected by the outside heat exchange temperature sensor 53 is a temperature indicating that the heat exchanger 34 of the outside unit 102 is frozen, the removal is performed. It has been determined that frost operation is required.

  In step S12, when it is determined that the defrosting operation is necessary (YES), the defrosting operation determination unit 51a transmits a defrosting start request signal requesting permission of the defrosting operation (step S13). Specifically, the defrosting operation determination unit 51a transmits a defrosting start request signal to the defrosting operation control unit 41a of the indoor unit control device 41.

  Then, control to raise the room temperature is executed (step S14). Here, the defrosting operation control section 41a receives (receives) a defrosting start request signal as a trigger to perform control to raise the room temperature. Specifically, the defrosting operation control unit 41a controls the heat exchanger 1 and the indoor fan 2 so that the room temperature becomes higher than the temperature set during the heating operation by a predetermined temperature (for example, 2 ° C.). That is, the heating control for raising the room temperature is performed before the defrosting operation.

  Next, the defrosting operation control unit 41a determines whether or not a predetermined condition is cleared (step S15). Here, the predetermined condition is that the room temperature becomes higher than the set temperature by a predetermined temperature (for example, 2 ° C.) by the heating control, or the time during which the heating control is executed (the heating continuation time) is predetermined. That is, the time (for example, 10 minutes) has elapsed. However, the predetermined condition is not limited to the above predetermined temperature and predetermined time.

  If it is determined in step S15 that the predetermined condition is cleared (YES), the defrosting operation control unit 41a transmits a defrosting permission signal to the defrosting operation determination unit 51a of the outdoor unit 102 (step S16). A drive signal for causing the wind guide panel 20 to assume the closed posture is transmitted to the opening / closing motor 24 (step S17).

  Finally, defrosting is started (step S18). Specifically, when the defrosting operation determination unit 51a receives the defrosting permission signal from the defrosting operation control unit 41a, the defrosting operation determination unit 51a transmits an execution signal for executing the defrosting operation to the defrosting operation execution unit 51b. ..

(Defrosting operation control: processing of defrosting operation)
FIG. 7 is a flowchart showing a flow of processing of the defrosting operation in the defrosting operation control. The following processing is performed by the defrosting operation control unit 41a of the indoor unit control device 41 and the defrosting operation determination unit 51a of the outdoor unit control device 51.

  First, in step S21, the defrosting operation is started. Since the heating operation is stopped during the defrosting operation, the indoor fan 2 and the outdoor fan 31 are stopped. Further, at the start of the defrosting operation, the wind guide panel 20 takes the closed posture. Here, the wind guide panel 20 changes the direction of the air blown from the air outlet 5 to a direction other than the front, such as below the indoor unit 101, so as to completely close the air outlet 5 of the indoor unit 101. It is driven so as to be in a posture to perform.

  Next, the defrosting operation determination unit 51a determines whether or not the defrosting operation has ended (step S22). Specifically, the defrosting operation determination unit 51a determines whether or not the defrosting operation ends based on the temperatures detected by the outside air temperature sensor 52 and the outdoor heat exchange temperature sensor 53 during the defrosting operation. Here, when the outside air temperature sensor 52 is equal to or higher than a predetermined temperature and the temperature detected by the outdoor heat exchange temperature sensor 53 is a temperature indicating that the heat exchanger 34 of the outdoor unit 102 is thawed, The end of frost operation is determined. It should be noted that the determination of the end of the defrosting operation is not limited to the above contents, and may be performed depending on whether a predetermined time (for example, 12 minutes) has elapsed from the start of the defrosting operation or the outdoor heat exchange. It may be performed depending on whether the temperature detected by the temperature sensor 53 has reached a temperature indicating that the heat exchanger 34 of the outdoor unit 102 is thawed. That is, when a predetermined time (for example, 12 minutes) has elapsed from the start of the defrosting operation, the defrosting operation is terminated, and the temperature detected by the outdoor heat exchange temperature sensor 53 causes the heat exchanger 34 of the outdoor unit 102 to thaw. The defrosting operation may be terminated when the temperature indicating that the defrosting operation is performed.

  In step S22, if the defrosting operation determination unit 51a determines that the defrosting operation has ended (YES), it executes noise countermeasures (step S23). Here, the noise is a sound generated when the refrigerant flows in a state where the indoor fan 2 is stopped when the defrosting operation ends, that is, before the defrosting operation ends and the heating operation starts again, The sound generated during heating operation is a different sound. Therefore, it is a noise countermeasure to make it difficult for a person in the room to hear this sound. Specifically, the defrosting operation determination unit 51a transmits to the defrosting operation control unit 41a a defrosting end signal indicating that defrosting has ended. As a result, the defrosting operation control unit 41a rotates the indoor fan 2 in the opposite direction to that during the heating operation while maintaining the closed state of the air guide panel 20, and causes the outdoor unit 31 to control the outdoor fan 31. Start operation. In this case, the rotation direction of the outdoor fan 31 is adjusted to the rotation direction during the heating operation, but the rotation speed is smaller than that during the heating operation.

  Then, it is determined whether the heating operation should be restarted (step S24). Specifically, the defrosting operation control unit 41a determines that the heating operation should be restarted when the reverse rotation time of the indoor fan 2 exceeds a predetermined time (for example, 2 minutes). The predetermined time is not particularly limited as long as it is the reverse rotation time of the indoor fan 2 that can reduce the sound generated when the refrigerant generated at the end of the defrosting operation flows.

  If it is determined that the heating operation should be restarted in step S24 (YES), the heating operation is started (step S25). Specifically, the defrosting operation control unit 41a transmits a signal indicating the start of heating operation to the outdoor unit control device 51, while releasing the closed posture of the wind guide panel 20 to change the opening angle of the wind guide panel 20. The opening / closing motor 24 is drive-controlled so that the opening angle is returned to the same opening angle as in the heating operation before the defrosting operation, and the indoor fan 2 is returned to the normal rotation. Further, the outdoor unit control device 51 returns the rotation speed of the outdoor fan 31 to the same rotation speed as that during the heating operation before the defrosting operation by receiving the signal indicating the heating operation start transmitted from the indoor unit control device 41.

(effect)
The graph shown in FIG. 8 shows changes with time in room temperature before and after the defrosting operation. In this graph, the thick line indicates the change over time in the room temperature due to the defrost control of the present application, and the thin line indicates the change over time in the room temperature under the conventional defrost control. The time t on the horizontal axis is t0 <t1 <t2 <t3, and the temperature T on the vertical axis is T0>T1>T2> T3.

  Conventionally, when the defrosting operation is started at time t1, the heating operation is stopped, so that the room temperature starts to drop from the set temperature T1 and drops to the room temperature T3. Then, when the defrosting operation ends and the heating operation is restarted, the room temperature rises again to the set temperature T1. On the other hand, in the present application, control is performed such that the room temperature rises from the time t0 before the defrosting operation is started at the time t1 to the room temperature T0 (T0> T1) higher than the set temperature T1. The defrosting operation is started at t1. During the defrosting operation, since the heating operation is stopped, the room temperature starts to drop from T0 higher than the set temperature T1 and drops to room temperature T2. Then, when the defrosting operation ends and the heating operation is restarted, the room temperature rises again to the set temperature T1.

  Here, when the defrosting operation is started during the heating operation at the set temperature T1, the room temperature is conventionally decreased from T1 to T3, and is decreased from T0 to T2 in the present application. However, from the relationship of T0> T1> T2> T3, the amount of decrease in temperature from T1 is conventional (T1-T3), but is the present application (T1-T2). That is, by providing the heating period (t0-t1) before the start of the defrosting operation as in the present application, it is possible to satisfy (T1-T3)> (T1-T2). The lower the temperature from the set temperature T1 during the defrosting operation is, the lesser the temperature is, so that it is less likely to feel cold.

  Further, during the defrosting operation, since the wind guide panel 20 is in the closed posture, it is possible to store heat inside the indoor unit 101. In order to effectively store heat inside the indoor unit 101, it is preferable that the wind guide panel 20 be in a closed position so that the air outlet 5 is completely closed. By utilizing the heat accumulated inside the indoor unit 101 for defrosting, the defrosting time can be shortened. In the graph shown in FIG. 8, the defrosting operation is started at time t1, the defrosting operation is finished, the heating operation is started again, and the set temperature T1 is returned to at the time t3 in the related art. In the present application, time t2 (t2 <t3). As described above, in the present application, it can be seen that the defrosting time is shorter than that in the past.

  Further, since the wind guide panel 20 is in the closed posture as described above between the end of the defrosting operation and the restart of the heating operation, the noise caused by the refrigerant flowing while the indoor fan 2 is stopped is generated. It becomes difficult to leak from. In order to prevent noise from leaking from the air outlet 5, it is preferable that the wind guide panel 20 be in a closed posture such that the air outlet 5 is completely closed. Moreover, the above noise is further reduced by rotating the indoor fan 2 in the direction opposite to the heating operation while maintaining the closed posture of the wind guide panel 20. At this time, if the air guide panel 20 completely closes the air outlet 5, noise can be further reduced. Further, by starting the operation of the outdoor fan 31, it is possible to further reduce the noise.

  Moreover, during the defrosting operation, since the wind guide panel 20 is in the closed posture, the unheated air (cold air) is not blown into the room from the outlet 5, or the direction below the indoor unit 101 other than the front direction. Moreover, it is more likely that the person inside will not feel cold. Here, the blowing direction (wind direction) of the air blown out from the blow-out port 5 that is changed by the wind guide panel 20 during the defrosting operation may be any direction that does not directly hit the person in the room.

  In this embodiment, various problems caused by the defrosting operation are solved by the following three characteristic points. (1) Raising the room temperature above the set temperature before the defrosting operation starts, (2) keeping the wind guide panel in the closed posture during the defrosting operation, and (3) the rotation direction of the indoor fan at the end of the defrosting operation. To reverse the heating operation.

  However, it is not necessary to include all of (1) to (3), and a combination of (1) (2) and (1) (3) may be used.

[Embodiment 2]
Another embodiment of the present invention will be described below. For convenience of description, members having the same functions as the members described in the above embodiment will be designated by the same reference numerals, and the description thereof will be omitted.

  In the defrosting control according to the present embodiment, the three problems described below in the defrosting operation that occur in the first embodiment are described below. (1) The room temperature is set higher than the set temperature before the start of the defrosting operation. , (2) keeping the wind guide panel in the closed posture during the defrosting operation, and (3) reversing the rotation direction of the indoor fan at the end of the defrosting operation from the heating operation. ) Combined control. Specifically, in this embodiment, the noise countermeasure execution process of step S23 of the process shown in FIG. 7 described in the first embodiment is omitted. As described above, even if noise caused by the flow of the refrigerant generated at the end of the defrosting operation is not considered, at least the process shown in FIG. You can do it.

[Embodiment 3]
Another embodiment of the present invention will be described below. For convenience of description, members having the same functions as the members described in the above embodiment will be designated by the same reference numerals, and the description thereof will be omitted.

  In the defrosting control according to the present embodiment, the three problems described below in the defrosting operation that occur in the first embodiment are described below. (1) The room temperature is set higher than the set temperature before the start of the defrosting operation. , (2) keeping the wind guide panel in the closed posture during the defrosting operation, and (3) reversing the rotation direction of the indoor fan at the end of the defrosting operation from the heating operation. ) Combined control. Specifically, in the present embodiment, the process of step S17 (blocking of the air outlet 5 by the wind guide panel 20) of the process shown in FIG. 6 described in the first embodiment is omitted. As described above, even if the air outlet 5 is not closed by the wind guide panel 20 during the defrosting operation, the remaining processing of FIG. It is possible to make it difficult to hear the sound of the refrigerant flowing at the end of the defrosting operation.

[Example of software implementation]
The control block of the indoor unit control device 41 (particularly the defrosting operation control unit 41a) and the control block of the outdoor unit control device 51 (particularly the defrosting operation determination unit 51a and the defrosting operation execution unit 51b) are integrated circuits (IC chips). It may be realized by a logic circuit (hardware) formed in, for example, or by software using a CPU (Central Processing Unit).

  In the latter case, the indoor unit control device 41 and the outdoor unit control device 51 store a CPU that executes the instructions of a program that is software that realizes each function, and the program and various data described above that can be read by a computer (or CPU). In addition, a ROM (Read Only Memory) or a storage device (these are referred to as a “recording medium”), a RAM (Random Access Memory) for expanding the program, and the like are provided. Then, the computer (or CPU) reads the program from the recording medium and executes the program to achieve the object of the present invention. As the recording medium, a “non-transitory tangible medium”, for example, a tape, a disk, a card, a semiconductor memory, a programmable logic circuit, or the like can be used. The program may be supplied to the computer via any transmission medium (communication network, broadcast wave, etc.) capable of transmitting the program. The present invention can also be realized in the form of a data signal embedded in a carrier wave, in which the above program is embodied by electronic transmission.

[Summary]
The defrost control device according to the first aspect of the present invention is a defrost control device that controls a defrost operation for thawing the frozen heat exchanger 34 of an outdoor unit (indoor unit 102) included in an air conditioner (air conditioner). When a start request signal requesting the start of the defrosting operation is received from the outdoor unit (outdoor unit 102) during the heating operation of the air conditioner (air conditioner), the room temperature is set to a preset temperature from the set temperature. After controlling the heating so that the temperature rises up to, the defrosting permission signal for permitting the defrosting operation is transmitted to the outdoor unit (outdoor unit 102), and the indoor unit is driven by the wind direction changing member (wind guide panel 20). The indoor unit 101 is characterized by being provided with a defrosting operation control section 41a that closes the blowout port 5 or changes the direction of the air blown from the blowout port 5 to a direction other than the front direction.

  According to the above configuration, during the heating operation, when the start request signal for requesting the start of the defrosting operation is received from the outdoor unit, the heating control is performed so that the room temperature rises from the set temperature to the preset temperature. Since the defrosting permission signal for permitting the defrosting operation is transmitted to the outdoor unit, the defrosting operation is started in the state where the room temperature rises from the set temperature. This makes it possible to offset the decrease in the room temperature during the defrosting operation with the increase in the room temperature, so that it is possible to make it difficult for the sensible temperature of the person in the room during the defrosting operation to be lowered. Become.

  Moreover, during the defrosting operation, the air direction changing member closes the outlet of the indoor unit or changes the direction of the air blown from the outlet to a direction other than the front, so that the air from the outlet of the indoor unit (set temperature Lower temperature air) is not blown directly to the person in the room. As a result, it is possible to reduce the reduction in the sensible temperature of the person in the room.

  Then, during the defrosting operation, the air outlet changing member closes the air outlet of the indoor unit or changes the direction of the air blown from the air outlet to a direction other than the front, so that heat can be stored inside the indoor unit. By utilizing this heat for defrosting, it becomes possible to shorten the defrosting time.

  Furthermore, when the defrosting operation is performed, the wind direction changing member closes the air outlet of the indoor unit or changes the direction of the air blown from the air outlet to a direction other than the front, at the end of the defrosting operation (from the end of the defrosting operation to the heating If it is maintained until the operation is restarted, it is possible to make it difficult to hear the sound (for example, the sound of the refrigerant flowing) from the outlet when the defrosting operation ends, and as a result, the discomfort caused by the noise of the person in the room Can be reduced.

  Therefore, it is possible to make it difficult for the user to feel the decrease in the body temperature during the defrosting operation and to make it difficult to hear the sound of the refrigerant flowing at the end of the defrosting operation.

  A defrost control device according to aspect 2 of the present invention controls a defrost operation for thawing a frozen heat exchanger 34 of an outdoor unit (outdoor unit 102) included in an air conditioner (air conditioner). When a start request signal requesting the start of the defrosting operation is received from the outdoor unit (outdoor unit 102) during the heating operation of the air conditioner (air conditioner), the room temperature is set to a preset temperature from the set temperature. After controlling the heating so that the temperature rises up to, the defrosting permission signal for permitting the defrosting operation is transmitted to the outdoor unit (outdoor unit 102), and the defrosting operation ends from the outdoor unit (outdoor unit 102). Until the heating operation is restarted and the fan (indoor fan 2) for blowing out the air of the indoor unit (outdoor unit 102) is rotated in the opposite direction to the rotation direction during the heating operation. It is characterized in that it comprises a control unit 41a.

  According to the above configuration, during the heating operation, when the start request signal for requesting the start of the defrosting operation is received from the outdoor unit, the heating control is performed so that the room temperature rises from the set temperature to the preset temperature. Since the defrosting permission signal for permitting the defrosting operation is transmitted to the outdoor unit, the defrosting operation is started in the state where the room temperature rises from the set temperature. This makes it possible to offset the decrease in the room temperature during the defrosting operation with the increase in the room temperature, so that it is possible to avoid feeling cold during the defrosting operation.

  Moreover, at the end of the defrosting operation, by rotating the fan for blowing out the air of the indoor unit in the direction opposite to the rotation direction during the heating operation, the refrigerant flows while the fan of the indoor unit is stopped. It becomes possible to make noise less audible and to reduce the discomfort caused by the noise of people in the room.

  Therefore, it is possible to make it difficult for the user to feel the decrease in the body temperature during the defrosting operation and to make it difficult to hear the sound of the refrigerant flowing at the end of the defrosting operation.

  The defrost control device according to the third aspect of the present invention controls the defrost operation for defrosting the frozen heat exchanger 34 of the outdoor unit (outdoor unit 102) included in the air conditioner (air conditioner). When a start request signal requesting the start of the defrosting operation is received from the outdoor unit (outdoor unit 102) during the heating operation of the air conditioner (air conditioner), the room temperature is set to a preset temperature from the set temperature. After performing heating control so that the temperature rises up to, the defrosting permission signal for permitting the defrosting operation is transmitted to the outdoor unit (outdoor unit 102), and the wind direction changing member (wind guide panel 20) causes the indoor unit ( The blowout port 5 of the indoor unit 101) is closed or the direction of the air blown from the blowout port 5 is changed to a direction other than the front direction, and a signal for ending the defrosting operation is received from the outdoor unit (outdoor unit 102). It is characterized in that it comprises a defrosting operation controller 41a for rotating in a direction opposite to the rotation direction of the fan during the heating operation (the indoor fan 2) for blowing air in the indoor (indoor unit 101).

  According to the above configuration, during the heating operation, when the start request signal requesting the start of the defrosting operation is received from the outdoor unit, after the heating control is performed such that the room temperature rises from the set temperature to the preset temperature, Since the defrosting permission signal for permitting the defrosting operation is transmitted to the outdoor unit, the defrosting operation is started in the state where the room temperature rises from the set temperature. This makes it possible to offset the decrease in the room temperature during the defrosting operation with the increase in the room temperature, so that it is possible not to feel cold during the defrosting operation.

  Moreover, during the defrosting operation, the air direction changing member closes the outlet of the indoor unit or changes the direction of the air blown from the outlet to a direction other than the front, so that the air from the outlet of the indoor unit (set temperature Lower temperature air) is not blown directly to the person in the room. As a result, it is possible to reduce the reduction in the sensible temperature of the person in the room.

  Then, during the defrosting operation, the air outlet changing member closes the air outlet of the indoor unit or changes the direction of the air blown from the air outlet to a direction other than the front, so that heat can be stored inside the indoor unit. By utilizing this heat for defrosting, it becomes possible to shorten the defrosting time.

  Further, during the defrosting operation, the state in which the air outlet changing member closes the outlet of the indoor unit or changes the direction of the air blown out from the outlet to a direction other than the front is at the end of the defrosting operation (from the end of the defrosting operation. If it is maintained until the heating operation is restarted), it is possible to make it difficult to hear the sound (for example, the sound of the refrigerant flowing) from the air outlet generated at the end of the defrosting operation, and as a result, the noise of the person in the room It is possible to reduce discomfort.

  Moreover, at the end of the defrosting operation, by rotating the fan for blowing out the air of the indoor unit in the direction opposite to the rotation direction during the heating operation, the refrigerant flows while the fan of the indoor unit is stopped. It is possible to make noise less audible and further reduce the discomfort caused by the noise of people in the room.

  Therefore, it is possible to make it difficult for the user to feel the decrease in the body temperature during the defrosting operation and to make it difficult to hear the sound of the refrigerant flowing at the end of the defrosting operation.

  In the defrosting control device according to the fourth aspect of the present invention, in the second or third aspect, when the defrosting operation control unit 41a receives a signal of the defrosting operation end from the outdoor unit (outdoor unit 102), the outdoor unit. A control signal for operating the fan (outdoor fan 31) of the unit (outdoor unit 102) may be transmitted to the outdoor unit (outdoor unit 102).

  According to the above configuration, when the signal of the defrosting operation end is received from the outdoor unit, the control signal for operating the fan of the outdoor unit is transmitted to the outdoor unit. Operate. As a result, when the defrosting operation ends, the fan of the indoor unit rotates in the direction opposite to the rotation direction during the heating operation, and the fan of the outdoor unit also starts operating, so that the noise of the refrigerant becomes more difficult to hear. The noise caused by the sound of the refrigerant can be made harder to hear, and the discomfort caused by the noise of people in the room can be further reduced.

  An air conditioner according to aspect 5 of the present invention includes an indoor unit including the defrost control device according to any one of aspects 1 to 4, and an outdoor unit that circulates a refrigerant between the indoor unit. It is characterized by

  According to the above configuration, it is possible to make it difficult to feel a decrease in the body temperature during the defrosting operation and to make it difficult to hear the sound of the refrigerant flowing at the end of the defrosting operation.

  The defrost control device according to each aspect of the present invention may be realized by a computer, and in this case, the defrost control device is operated by operating the computer as each unit (software element) included in the defrost control device. The defrosting control program of the defrosting control device which implement | achieves with a computer, and the computer-readable recording medium which recorded it are also in the category of this invention.

  The present invention is not limited to the above-described embodiments, and various modifications can be made within the scope of the claims, and the embodiments obtained by appropriately combining the technical means disclosed in the different embodiments. Is also included in the technical scope of the present invention. Furthermore, new technical features can be formed by combining the technical means disclosed in each embodiment.

DESCRIPTION OF SYMBOLS 1 heat exchanger 2 indoor fan 3 cabinet 4 suction port 5 air outlet 6 air passage 7 filter 8 cleaning device 9 dust removing section 10 guide path 11 rotating brush 20 wind guide panel (wind direction changing member)
21 front panel 22 lower shaft 23 upper shaft 24 opening / closing motor 31 outdoor fan 32 compressor 33 four-way valve 34 heat exchanger 41 indoor unit controller 41a defrosting operation controller 42 indoor temperature sensor 43 indoor heat exchange temperature sensor 51 outdoor unit control Device 51a Defrosting operation determination unit 51b Defrosting operation execution unit 52 Outdoor air temperature sensor 53 Outdoor heat exchange temperature sensor 101 Indoor unit (indoor unit)
102 Outdoor unit (outdoor unit)

Claims (4)

A defrost control device for controlling a defrosting operation for thawing a frozen heat exchanger of an outdoor unit included in an air conditioner,
During the heating operation of the air conditioner, when receiving a start request signal requesting the start of the defrosting operation from the outdoor unit, after heating control is performed so that the room temperature rises from a set temperature to a preset temperature, When the defrosting permission signal for permitting the defrosting operation is transmitted to the outdoor unit and the signal for ending the defrosting operation is received from the outdoor unit, the fan for blowing out the air of the indoor unit is rotated in the rotation direction during the heating operation. The defrosting control device is provided with a defrosting operation control unit that rotates in the opposite direction. A defrost control device for controlling a defrosting operation for thawing a frozen heat exchanger of an outdoor unit included in an air conditioner,
During the heating operation of the air conditioner, when receiving a start request signal requesting the start of the defrosting operation from the outdoor unit, after heating control is performed so that the room temperature rises from a set temperature to a preset temperature, The defrosting permission signal for permitting the defrosting operation is transmitted to the outdoor unit, and the wind direction changing member closes the outlet of the indoor unit or changes the direction of the wind blown from the outlet to a direction other than the front, When the defrosting operation end signal is received from the outdoor unit, the defrosting operation control unit that rotates the fan for blowing out the air in the indoor unit in the direction opposite to the rotation direction during the heating operation is characterized. Defrost control device. The defrosting operation control unit,
The defrosting control device according to claim 1 or 2 , wherein, when receiving a defrosting operation end signal from the outdoor unit, a control signal for operating a fan of the outdoor unit is transmitted to the outdoor unit. And an indoor unit provided with a defrosting control unit according to any one of claim 1 to 3 an air conditioner including an outdoor unit for circulating a refrigerant between the indoor unit.

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