JP2010085017A - Indoor unit for air conditioner and the air conditioner including the same - Google Patents

Abstract

An indoor unit of an air conditioner that can easily and effectively suppress the scattering of condensed water generated in a heat exchanger and an air conditioner including the same.
An indoor unit (25) is provided in a casing (15) having a suction port (11) and a blower outlet (13), and inside the casing (15), and the indoor air is sucked from the suction port (11) into the casing (15). In order to remove the condensed air 53 generated in the heat exchanger 19 and the heat exchanger 19 disposed inside the casing 15 and the heat exchanger 19, the flow rate of the air passing through the heat exchanger 19 And an indoor controller 75a that executes a condensed water removal operation that raises the temperature step by step.
[Selection] Figure 1

Description

  The present invention relates to an indoor unit of an air conditioner and an air conditioner including the same.

  The indoor unit of an air conditioner includes a blower and a heat exchanger inside a casing. The blower sucks indoor air into the casing from the suction port and blows it out from the blower outlet. The heat exchanger includes a refrigerant pipe through which the refrigerant passes and fins that are in contact with the refrigerant pipe. As the heat exchanger, various types such as a cross fin type and a laminated type are used.

  When the air conditioner is operated, the refrigerant flows into the refrigerant pipe of the heat exchanger, and heat is exchanged with the air flowing along the fins of the heat exchanger, so that the temperature of the air is adjusted. At this time, moisture contained in the air may condense on the surfaces of the refrigerant tubes and fins to form water droplets. A part of this condensed water is swept away to the outlet side of the heat exchanger by the wind pressure of the air flowing along the fins and collected in the drain pan, while the other part remains attached to the surfaces of the refrigerant pipe and the fins.

  However, when the flow velocity of the air flowing along the fin is large, the condensed water adhering to the surface of the refrigerant pipe or the fin may be blown off and scattered by the wind pressure of the air. Therefore, various methods for appropriately treating the condensed water generated in the heat exchanger have been proposed.

For example, Patent Literature 1 discloses an air conditioner that performs a preheating operation in which a heat exchanger is temporarily stopped in a state where a blower is temporarily stopped until water droplets attached to the heat exchanger are completely evaporated. Yes. In Patent Document 2, in a separation-type air conditioner in which a plurality of indoor units are connected to one outdoor unit, when the dew condensation sensor of the stopped indoor unit detects condensation, the blower of the stopped indoor unit Has been disclosed. Patent Document 3 includes a heat exchanger composed of a heat transfer tube and fins that are water-repellent treated with a fluorine-based substance, and is provided with an air volume control device that intermittently controls the air velocity of the air flowing into the heat exchanger. A heat exchange device is disclosed.
JP-A-4-73545 Japanese Patent Laid-Open No. 9-264596 JP-A-7-190570

  In the air conditioner described in Patent Document 1, water droplets are evaporated by switching from the cooling operation to the heating operation and heating the heat exchanger of the indoor unit. Since this method is assumed to be applied at the turn of the season when the cooling operation is switched to the heating operation, it is difficult to apply this method at other times. Further, in order to evaporate the condensed water, it is possible to temporarily switch from the cooling operation to the heating operation to evaporate the condensed water, and then switch to the cooling operation again. In this case, however, the control becomes complicated.

  The air conditioner described in Patent Document 2 attempts to achieve dripping prevention from the indoor unit by forcibly blowing air to the condensed water and evaporating it. However, in this method, it is conceivable that the condensed water is blown away by the air blow applied to evaporate the condensed water, so that the problem that the condensed water is scattered is not solved.

  In the heat exchange device described in Patent Document 3, the condensed water easily flows due to the water repellent treatment, but the problem that the condensed water scatters due to the wind pressure still remains.

  Therefore, the present invention has been made in view of such a point, and an object of the present invention is to provide a room for an air conditioner that can easily and effectively suppress scattering of condensed water generated in a heat exchanger. It is providing a machine and an air conditioning apparatus provided with the same.

  The indoor unit of the air conditioner according to the present invention includes a casing (15) having an inlet (11) and an outlet (13), and is disposed inside the casing (15). 11) from the blower outlet (13) to the inside of the casing (15) and blown out of the casing (15); and a heat exchanger (17) disposed inside the casing (15) 19) and condensate removal for gradually increasing the flow rate of the air (A) passing through the heat exchanger (19) in order to remove the condensate (53) generated in the heat exchanger (19). And a control means (75a) for executing the operation.

  In this configuration, in order to remove the condensed water (53) generated in the heat exchanger (19), the condensed water removal that gradually increases the flow rate of the air (A) passing through the heat exchanger (19). Since the control means (75a) for performing the operation is provided, it is possible to easily and effectively suppress the scattering of the condensed water (53) generated in the heat exchanger (19).

  Since the size of the condensed water (water droplets) generated in the heat exchanger varies, when the condensed water is pushed away at a certain flow rate, the condensed water of a size suitable for the flow rate is on the surface of the refrigerant pipe and the fin. However, the larger condensed water stays in place without being swept away, and the smaller condensed water is blown off to the inside of the casing. It will be scattered or, depending on the case, it will also be scattered from the outlet to the outside of the casing.

  Similarly, when the flow rate of the air (A) passing through the heat exchanger rises linearly and reaches the set flow rate in a short time, such as when the operation of the stopped blower is started, the same as above. Therefore, it is difficult to appropriately drain condensed water of various sizes and collect it in a drain pan. Usually, a refrigerant pipe and a fin have predetermined length along the direction through which air (A) flows, and condensed water arises over a wide range of the surface of a refrigerant pipe and a fin. Therefore, when the flow rate rises linearly, some water droplets can move without being blown off the predetermined length, but before moving the predetermined length, the flow velocity exceeds the range suitable for the water droplets. Many water droplets will be blown away.

  On the other hand, in the present configuration, as described above, the condensed water removal operation is performed in which the flow rate of the air (A) passing through the heat exchanger (19) is increased stepwise, so that the condensate has a size suitable for the flow rate of each step. The rate at which the water (53) can reach the outlet of the heat exchanger (19) without splashing can be increased. By executing the relatively simple control of increasing the flow rate stepwise in this manner, the condensed water (53) of various sizes generated in the heat exchanger (19) can be appropriately washed away to obtain more condensed water. Since (53) can be recovered, it is easy for the condensed water (53) to splash inside the casing (15) and for the condensed water (53) to splash outside the casing (15) from the outlet. It can be effectively suppressed.

  In the condensed water removal operation, the control means (75a) preferably maintains the flow rate at each stage for a predetermined time and increases the flow rate stepwise. In this way, by maintaining the flow rate of each stage for a predetermined time, a time margin can be further provided in which condensed water (53) having a size suitable for the flow rate of each stage can reach the outlet of the heat exchanger (19). . As a result, the condensed water (53) of various sizes generated in the heat exchanger (19) can be more appropriately washed away to collect more condensed water (53). Scattering can be more effectively suppressed.

  The control means (75a) preferably performs the condensed water removal operation when the flow rate of the air (A) is changed to a higher one. Specifically, the time when the flow rate of the air (A) is changed to a higher one can be exemplified, for example, when the operation is started, when restarting from thermo-off, or when the setting of the flow rate is increased. When the flow rate of air (A) is changed to a higher value as described above, the condensate is likely to scatter, and by adopting this configuration, the scatter can be suppressed at a more appropriate timing. In particular, since the condensed water (53) is often generated in the heat exchanger (19) when the air conditioner is started up and restarted from the thermo-off state, the condensed water removing operation is performed when starting or restarting. By setting in advance so as to be executed, it is possible to increase the certainty of suppressing the scattering of the condensed water (53).

  When the control means (75a) determines that condensed water (53) is generated in the heat exchanger (19) and determines that the condensed water (53) may be scattered, You may make it perform the said condensed water removal driving | operation. For example, the condensation state is estimated from the temperature and humidity, and it is determined that the condensed water (53) is attached to the fin, and there is a possibility that the condensed water (53) may be scattered based on the set flow rate of normal operation. When it is determined that there is a condensed water removal operation. Thereby, since the condensed water removal operation can be executed only when the necessity for removing condensed water is high, scattering of condensed water (53) can be more effectively suppressed. Further, since the flow rate of air (A) is increased stepwise in the condensed water removal operation, a certain amount of time is spent before shifting to the normal operation. Therefore, in this configuration, it is not necessary to perform the condensed water removal operation when the necessity for removing the condensed water is low, so that it is possible to prevent an extra waiting time from occurring for the user.

  In the condensed water removal operation, the control means (75a) preferably increases the flow rate stepwise to the same value as the set flow rate of the normal operation after the condensed water removal operation. Thus, by increasing the flow rate of the condensed water removal operation to the same value as the set flow rate of the normal operation, it is possible to smoothly shift from the condensed water removal operation to the normal operation.

  In the condensed water removal operation, the control means (75a) may increase the flow rate stepwise up to a value exceeding the set flow rate of the normal operation after the condensed water removal operation. For example, a large amount of condensed water (53) generated in the heat exchanger (19) may not be removed at a flow rate that is the same value as the set flow rate in normal operation. In such a case, the condensed water removal operation is more appropriately removed by gradually increasing the flow rate of the condensed water removal operation to a value exceeding the set flow rate of the normal operation. can do.

  In the present invention, the heat exchanger (19) includes a refrigerant pipe (21) having a flat shape through which a refrigerant passes and a corrugated fin (45) disposed in contact with the refrigerant pipe (21). This is particularly effective in the case of a stacked heat exchanger (19). The laminated heat exchanger (19) has a plurality of channels surrounded by the corrugated fins (45) and the refrigerant pipe (21), and condensed water (53) remains in these channels. The problem of scattering of condensed water (53) is also likely to occur.

  In the condensed water removal operation, the predetermined time for maintaining the flow velocity at each stage is suitably set to 3 seconds or more and 60 seconds or less.

  Another indoor unit of an air conditioner according to the present invention is provided in a casing (15) having a suction port (11) and a blower outlet (13), and inside the casing (15). A blower (17) that sucks into the casing (15) from the mouth (11) and blows out from the outlet (13) to the outside of the casing (15), and heat exchange disposed in the casing (15). And a control means for executing a condensed water removal operation for gradually increasing the rotational speed of the blower (17) in order to remove the condensed water (53) generated in the heat exchanger (19) and the heat exchanger (19). 75a).

  In this structure, the control means (75a) which performs the condensed water removal operation which raises the rotation speed of a fan (17) in steps is provided. When the rotational speed of the blower (17) is increased stepwise in the condensed water removal operation, the flow rate of the air (A) passing through the heat exchanger (19) also increases stepwise, so that the heat exchanger ( The scattering of the condensed water (53) generated in 19) can be easily and effectively suppressed.

  In the condensed water removal operation, the control means (75a) preferably maintains the rotational speed of the blower (17) at each stage for a predetermined time to increase the rotational speed stepwise. If the rotational speed of the blower (17) at each stage is maintained for a predetermined time and the rotational speed is increased stepwise, the flow speed at each stage can be maintained for a predetermined time and the flow speed can be increased stepwise. As described above, scattering of the condensed water (53) can be further effectively suppressed.

  Each structure mentioned above is suitable when the said heat exchanger (19) is arrange | positioned between the said air blower (17) and the said blower outlet (13). Thus, when the heat exchanger (19) is arrange | positioned rather than the air blower (17) at the blower outlet (13) side, the condensed water produced in the heat exchanger (19) passes through the blower outlet (13), and the casing (15 However, according to this configuration, it is possible to effectively suppress the scattering to the outside.

  The air conditioner of the present invention includes the indoor unit (25) described above and an outdoor unit (73).

  As described above, according to the present invention, since the control means for executing the condensed water removal operation for gradually increasing the flow velocity of the air passing through the heat exchanger is provided, various sizes generated in the heat exchanger are provided. The condensed water can be appropriately washed away to collect more condensed water, and scattering of the condensed water can be easily and effectively suppressed.

  Hereinafter, the best mode for carrying out the present invention will be described in detail with reference to the drawings. As shown in FIG. 1, the air conditioner 71 according to the present embodiment includes an indoor unit 25 and an outdoor unit 73. In the air conditioner 71, the heat exchanger 19 disposed in the indoor unit 25 and the compressor 75, the heat exchanger 77, and the expansion valve 79 disposed in the outdoor unit 73 are connected by a pipe so that the refrigerant is supplied. A circulating refrigerant circuit is configured. The air conditioner 71 can switch between a cooling operation and a heating operation by switching the flow direction of the refrigerant by a four-way switching valve 87 arranged in a part of the piping of the refrigerant circuit. The indoor unit 25 and the outdoor unit 73 are provided with blowers 17 and 81, respectively. The operation of the indoor unit 25 and the outdoor unit 73 is controlled by the control unit 75. The control unit 75 includes an indoor control unit (control means) 75 a that controls the operation of the indoor unit 25.

  As shown in FIGS. 2 and 3, the indoor unit 25 includes a casing 15 formed of a substantially rectangular parallelepiped box having a front surface 55, a back surface 57, side surfaces 59 and 61, a top surface 63, and a bottom surface 65. A blower 17 and a heat exchanger 19 are provided inside.

  The casing 15 has a suction port 11 for sucking indoor air into the casing 15 at the center of the front surface 55. The casing 15 has air outlets 13 for blowing air inside the casing 15 to the outside of the casing 15 on both ends in the horizontal direction of the front surface 55 (side surface 59 side and side surface 61 side). A suction grille 27 and a blowout grill 29 are attached to the suction port 11 and the blowout port 13, respectively, covering these openings. The inner surface of the boundary portion between the back surface 57 and the side surfaces 59 and 61 of the casing 15 is formed in an arc shape in order to make the air flow smooth.

  The blower 17 is a turbo fan that is a type of centrifugal fan that blows air in the centrifugal direction. The blower 17 includes a motor 33 fixed to the back surface 57 of the casing 15, a shaft 35 that rotates as the motor 33 is driven, and a rotor 41 attached to the shaft 35.

  The rotor 41 has a suction port on the front surface 55 side of the casing 15, and has a discharge port on the peripheral side in the radial direction, and a plurality of blades 37 are provided along the discharge port. When the motor 33 is driven, the rotor 41 rotates, and air is sucked from the suction port of the rotor 41 and discharged from the discharge port at the peripheral edge as shown by a two-dot chain line in FIG.

  The heat exchanger 19 is a stacked heat exchanger, and two heat exchangers 19 are accommodated inside the casing 15. These heat exchangers 19 are respectively disposed between the blower 17 inside the casing 15 and the one outlet 13 and between the blower 17 and the other outlet 13, as shown in FIG. The casing 15 is connected by a pipe 31 disposed in a space on the bottom surface 65 side inside the casing 15.

  As shown in FIG. 4, the heat exchanger 19 includes a plurality of refrigerant tubes 21 having a flat shape and arranged substantially parallel to each other, and a plurality of corrugated fins 45 respectively disposed between the refrigerant tubes 21. And frame members 47a, 47b, 47c, 47d that surround these upper and lower sides and both side portions.

  As shown in FIG. 5, the corrugated fin 45 is joined to the refrigerant pipe 21 by a method such as brazing at a bent portion 85 that is bent. Thereby, a plurality of passages 83 surrounded by the corrugated fins 45 and the refrigerant pipes 21 are formed. The air discharged from the discharge port of the blower 17 flows into these passages 83 as shown by a two-dot chain line in FIG. 3, and this air is blown out of the casing 15 through the blowout port 13.

  Each refrigerant pipe 21 is made of a metal such as aluminum or an alloy thereof excellent in corrosion resistance and thermal conductivity, and is arranged substantially parallel to each other at a predetermined interval. As shown in FIG. 5, a plurality of refrigerant passages 49 through which the refrigerant passes are formed inside each refrigerant pipe 21. The refrigerant sent through the pipe 31 is heat-exchanged with the air A flowing through the passage 83 in the course of flowing through the refrigerant passage 49 of each refrigerant pipe 21.

  Next, the driving | running operation | movement of the air conditioning apparatus 71 concerning this embodiment is demonstrated. FIG. 6 is a flowchart illustrating a control example 1 of the indoor unit 25. When the user gives an instruction to start the cooling operation of the air conditioner 71 (when the operation is started) or when restarting from the thermo-off, as shown in FIG. 6, the indoor control unit 75a performs step 1 (in FIG. 6). As shown in FIG.

  As shown in FIG. 7, in the condensed water removal operation, the air A passing through the passage 83 of the heat exchanger 19 in order to remove the condensed water 53 (see FIG. 5) generated in the corrugated fins 45 of the heat exchanger 19. Gradually increase the flow rate. In this control example 1, the flow up to the set flow velocity (target flow velocity) is divided into five steps and the flow velocity is increased stepwise.

  In each stage, after maintaining a predetermined flow rate for a predetermined time, the process proceeds to the next stage. The indoor control unit 75a maintains the flow rate at the fifth stage (final stage) for a predetermined time, then increases the flow rate to the set flow rate, ends the condensed water removal operation, and starts the normal operation (S2). That is, in the condensed water removal operation, the indoor control unit 75a increases the flow rate stepwise to the same value as the set flow rate of the normal operation after the condensed water removal operation.

  The predetermined time for maintaining the flow velocity at each stage may be appropriately set according to the length of the passage 83 in the direction in which the air A flows, the surface characteristics (water wettability) of the corrugated fins 45, and the like, and is particularly limited. However, it is preferably set to 3 to 60 seconds, more preferably 5 to 30 seconds. In addition, the time for maintaining the flow rate in each stage may be the same as or different from each other.

  Specifically, the flow rate maintenance time from the first stage to the fifth stage is set to 20 seconds, the first stage is set to 30 seconds, the second stage is 25 seconds, the third stage is 20 seconds, etc. The flow rate maintenance time is shortened as it goes through the steps, the first step is set to 5 seconds, the second step is 10 seconds, the third step is 15 seconds, etc. Various forms can be exemplified.

  For example, if the set flow rate for normal operation is 3 m / sec, the flow rate at each stage is 0.5 m / sec for the first stage, 1.0 m / sec for the second stage, and 0.5 m / sec for the third stage and beyond A mode in which the flow velocity is increased at regular intervals, for example, the fifth stage is increased to 2.5 m / second by increasing each time. Further, the flow velocity at each stage is not increased at equal intervals, but may be increased at equal intervals, or may be increased at random intervals. The upper limit value of the flow rate at the fifth stage (final stage) is preferably about 2.5 m / second to 3.5 m / second in consideration of noise to the user, the performance of the blower 17 and the like.

  The flow rate of the air A passing through the passage 83 of the heat exchanger 19 is adjusted mainly by controlling the rotational speed of the blower 17. By increasing the rotational speed of the blower 17 stepwise, the flow velocity is increased stepwise.

  Note that the flow rate of the air A may be adjusted, for example, by adjusting the opening area of the suction port 11 and / or the air outlet 13 of the casing 15. Further, the condensed water removal operation may be executed when the set value of the flow rate in the normal operation is increased instead of or in addition to the above-described operation at the time of starting the operation or restarting from the thermo-off state.

  By executing the condensed water removal operation as described above, the condensed water 53 having a small particle diameter starts to slide on the surface of the corrugated fin 45 in the passage 83 at the first stage where the flow velocity is low. Many of them reach the end portion 51 of the passage 83 during a predetermined flow rate maintenance time and are collected in a drain pan (not shown) disposed in the casing 15. Thereafter, as the flow rate increases in the second and third stages, the condensed water 53 having a larger particle size slides on the surface of the corrugated fin 45 to reach the end 51 of the passage 83 and is sequentially collected in the drain pan. .

  FIG. 8 is a flowchart showing a control example 2 of the indoor unit 25. As shown in FIG. 8, in the condensed water removal operation, the indoor control unit 75a gradually increases the flow rate of the air A passing through the passage 83 to a value exceeding the set flow rate of the normal operation after the condensed water removal operation. .

  In this control example 2, when the set flow rate in the normal operation is low, the condensed water 53 generated in the heat exchanger 19 is increased by gradually increasing the flow rate to a flow rate larger than the set flow rate in the condensed water removal operation. Can be removed appropriately.

  Specifically, for example, when the set flow rate is about 1.5 m / sec, the first step flow rate is set to a value lower than the set flow rate, and the flow rate is increased step by step sequentially. The flow rate is set to a value larger than the set flow rate. The indoor control unit 75a maintains the flow rate at the fifth stage (final stage) for a predetermined time, then lowers the flow rate to the set flow rate, ends the condensed water removal operation, and starts the normal operation.

  FIG. 9 is a flowchart illustrating a control example 3 of the indoor unit 25. As shown in FIG. 9, the indoor control unit 75a gradually increases the flow rate of the air A passing through the passage 83 in the condensed water removal operation. In the control example 3, the flow rate at each step is a predetermined time. The control example is different from the control examples 1 and 2 in that it rises with a gentle slope.

  In this control example 3, the flow rate is increased stepwise by dividing the range up to the set flow rate into five floors. In each stage, after gradually increasing the flow velocity over a predetermined time, the process proceeds to the next stage. The indoor controller 75a gradually increases the flow rate at the fifth stage (final stage) over a predetermined time, then increases the flow rate to the set flow rate, ends the condensed water removal operation, and starts the normal operation.

  The predetermined time for gradually increasing the flow rate at each stage is preferably set to 3 seconds to 60 seconds, more preferably 5 seconds to 30 seconds, as in Control Example 1. In addition, the time for maintaining the flow rate in each stage may be the same as or different from each other. The difference between the initial speed and the final speed of the flow velocity at each stage is not particularly limited, but is preferably set to about 0.1 m / second to 1.0 m / second, for example.

  When the flow velocity at each stage is gradually increased as in Control Example 3, the moving speed at which the condensed water 53 slides on the surface of the corrugated fin 45 at each stage can be gradually increased. Therefore, compared to the conventional indoor unit in which the flow velocity of the air passing through the heat exchanger 19 rises linearly and reaches the set flow velocity in a short time, it is possible to suppress the condensate 53 from being scattered, and a control example Compared with 1 and 2, the moving speed of the condensed water 53 can be gradually increased so that the condensed water 53 can reach the end portion 51 of the passage 83 in a shorter time.

  FIG. 10 is a flowchart illustrating a control example 4 of the indoor unit 25. As shown in FIG. 10, in this control example 4, the indoor control unit 75 a determines that condensed water 53 is generated in the heat exchanger 19, and the condensed water 53 passes from the outlet 13 to the outside of the casing 15. When it is determined that there is a possibility of splashing, the condensed water removal operation is executed.

  First, in step 11, the indoor control unit 75 a determines whether or not condensed water 53 is generated in the heat exchanger 19. The determination in step 11 can be performed, for example, by providing a dew condensation sensor (not shown) in the heat exchanger 19 and detecting the presence or absence of dew condensation in the heat exchanger 19. Further, instead of the dew condensation sensor, for example, a temperature sensor and a humidity sensor (not shown) may be provided in the heat exchanger 19, and the presence or absence of dew condensation may be detected from these measurement data.

  In step 11, when the indoor control unit 75a determines that condensed water is not generated (in the case of NO), the indoor control unit 75a proceeds to step 14 and starts normal operation. On the other hand, when the indoor control unit 75a determines in step 11 that condensed water is generated (in the case of YES), the indoor control unit 75a proceeds to step 12.

  Next, in step 12, it is determined whether or not the condensed water 53 may be scattered from the outlet 13 to the outside of the casing 15. The determination in step 12 can be performed based on, for example, whether the normal operation flow rate is set to a predetermined value or more. Specifically, for example, when the set flow rate for normal operation is 3 m / second or more, the indoor control unit 75a scatters the condensed water 53 generated in the heat exchanger 19 from the outlet 13 to the outside of the casing 15. Judging that there is a possibility of.

  In Step 12, when the indoor control unit 75a determines that there is no possibility that the condensed water 53 is scattered (in the case of NO), the indoor control unit 75a proceeds to Step 14 and starts normal operation. On the other hand, when the indoor control unit 75a determines in step 12 that the condensed water 53 may be scattered (in the case of YES), the process proceeds to step 13.

  In step 13, the condensed water 53 generated in the heat exchanger 19 is removed by executing the above-described condensed water removing operation. Then, it progresses to step 14 and starts a normal driving | operation.

  As described above, the indoor unit 25 of the air conditioner 71 according to the embodiment described above gradually reduces the flow rate of the air passing through the heat exchanger 19 in order to remove the condensed water generated in the heat exchanger 19. The indoor control part 75a which performs the condensed water removal operation to raise is provided (control examples 1-4). Thereby, the ratio which the condensed water of the magnitude | size suitable for the flow rate of each step can reach | attain the exit of the heat exchanger 19 can be increased. As a result, the condensed water of various sizes generated in the heat exchanger 19 can be appropriately washed away and more condensed water can be recovered, so that the condensed water can be easily scattered inside and outside the casing 15. Can be effectively suppressed. Thereby, a user's discomfort accompanying the scattering of the condensed water to the exterior of the casing 15 can be reduced. Moreover, it is possible to prevent mold from being generated due to water droplets adhering to the inner surface of the casing 15, the blower 17, and the like due to scattering of condensed water into the casing 15.

  Moreover, in the said embodiment, the indoor control part 75a maintains the flow rate of each step for a predetermined time, respectively, and raises the flow rate stepwise in the condensed water removal operation (Control Example 1 and Control Example 2). By maintaining the flow rate at each stage for a predetermined time in this way, a time margin is further created in which condensed water having a size suitable for the flow rate at each stage can reach the outlet of the heat exchanger 19. Thereby, since the condensed water of various sizes generated in the heat exchanger 19 can be more appropriately washed away and more condensed water can be recovered, scattering of the condensed water can be further effectively suppressed. .

  Moreover, in the said embodiment, the indoor control part 75a performs a condensed water removal driving | operation at the time of starting or the restart from thermo-off (control examples 1-3). Condensed water may be generated in the heat exchanger 19 when the air conditioner 71 is started up and when the air conditioner 71 is restarted. Therefore, it is possible to condense by preliminarily setting the condensate removing operation at the time of starting or restarting. Water scattering can be more effectively suppressed.

  Moreover, in the said embodiment, the indoor control part 75a judges that the condensed water has arisen in the heat exchanger 19, and judges that condensed water may be scattered from the blower outlet 13 to the exterior of the casing 15. FIG. When this occurs, the condensed water removal operation is executed (control example 4). Thereby, since the condensed water removal operation can be executed only when the necessity for removing condensed water is high, scattering of condensed water can be more effectively suppressed. Further, when the necessity for removing condensed water is low, it is not necessary to perform the condensed water removing operation, so that it is possible to prevent an extra waiting time from occurring for the user.

  Moreover, in the said embodiment, the indoor control part 75a raises the flow rate in steps in the condensed water removal operation to the same value as the setting flow velocity of the normal operation after the condensed water removal operation (Control Example 1 and Control Example 3). ). Thus, by increasing the flow rate of the condensed water removal operation to the same value as the set flow rate of the normal operation, it is possible to smoothly shift from the condensed water removal operation to the normal operation.

  Further, in the condensed water removal operation, the indoor control unit 75a gradually increases the flow velocity to a value exceeding the set flow velocity of the normal operation after the condensed water removal operation (Control Example 2). Thus, the condensed water generated in the heat exchanger 19 can be appropriately removed more appropriately by gradually increasing the flow rate of the condensed water removal operation to a value exceeding the set flow rate of the normal operation.

  Further, in the above embodiment, the heat exchanger 19 has a flat shape through which the refrigerant passes, and at least two refrigerant pipes 21 arranged opposite to each other and a corrugate arranged between the two refrigerant pipes 21. This is a laminated heat exchanger 19 having fins 45. In the stacked heat exchanger 19, a plurality of flow paths surrounded by the corrugated fins 45 and the refrigerant pipes 21 are formed. Condensed water tends to remain in these flow paths, and there is a problem of scattering of the condensed water. Therefore, the condensed water removal operation is particularly effective.

  The present invention is not limited to the above-described embodiment, and various modifications and improvements can be made without departing from the spirit of the present invention. For example, in the above-described embodiment, the case where a stacked heat exchanger is used as the heat exchanger has been described as an example, but another heat exchanger such as a cross fin type may be used.

  In the above embodiment, in the condensed water removal operation, when the control unit determines that condensed water is generated in the heat exchanger and determines that the condensed water may be scattered from the outlet to the outside of the casing. In addition, the case where the condensed water removal operation is executed has been described as an example. For example, the control unit condenses when it is determined that condensed water is generated in the heat exchanger without determining the possibility of scattering. You may make it perform water removal driving | operation.

  In the above embodiment, the possibility of the condensed water scattering to the outside of the casing is used as a criterion for determining whether or not the condensed water removing operation is necessary. For example, the possibility of the condensed water scattering to the inside of the casing is required for the condensed water removing operation. It is good also as a negative judgment standard. When the flow velocity of air is the same, as a matter of course, the possibility of scattering inside the casing is higher than the possibility of scattering outside the casing. Therefore, in the control example 4, in step 12, the possibility of scattering to the outside of the casing is determined based on, for example, the set flow velocity value of 3 m / second for normal operation, but the possibility of scattering to the inside of the casing is determined. If so, a value smaller than the set flow velocity value of 3 m / sec may be used as a reference.

  In the above embodiment, the case where the condensed water removal operation is executed before the normal operation has been described as an example. However, for example, even when the normal operation start instruction is not given (that is, when the normal operation is not performed) Only the condensed water removal operation may be executed alone.

  In the above embodiment, the case where the condensed water removal operation is executed in five stages has been described as an example. However, the condensed water removal operation may be divided into two to four stages, which are fewer than five stages, and from the five stages. It may be divided into more than 6 stages.

  In the said embodiment, although the case where the heat exchanger was arrange | positioned between the air blower and the blower outlet was mentioned as an example and demonstrated, the air blower is arrange | positioned rather than the heat exchanger at the blower outlet side (downstream side). May be. In the case of this form, compared with the said embodiment, although possibility of scattering of the condensed water to the exterior of a casing becomes low, scattering of the condensed water to the inside of a casing still becomes a subject. Therefore, by applying the present invention to this form, it is possible to effectively suppress the scattering of condensed water into the casing.

It is a lineblock diagram showing a schematic structure of an air harmony device concerning one embodiment of the present invention. It is a front view which shows the indoor unit in the air conditioning apparatus of FIG. It is the III-III sectional view taken on the line of FIG. It is a perspective view which shows the laminated heat exchanger arrange | positioned at the indoor unit of FIG. It is a partially broken perspective view which shows the internal structure of the laminated heat exchanger of FIG. It is a flowchart which shows the control example 1 of the indoor unit of FIG. It is a graph which shows the control example 1 of the indoor unit of FIG. It is a graph which shows the control example 2 of the indoor unit of FIG. It is a graph which shows the control example 3 of the indoor unit of FIG. It is a flowchart which shows the control example 4 of the indoor unit of FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 11 Inlet 13 Outlet 15 Casing 17 Blower 19 Heat exchanger 21 Refrigerant pipe 25 Indoor unit 45 Corrugated fin 53 Condensed water 71 Air conditioner 73 Outdoor unit 75 Control part 75a Indoor control part

Claims (13)

A casing (15) having an inlet (11) and an outlet (13);
A blower that is disposed inside the casing (15), sucks indoor air into the casing (15) from the suction port (11), and blows it out of the casing (15) through the outlet (13). 17)
A heat exchanger (19) disposed inside the casing (15);
In order to remove the condensed water (53) generated in the heat exchanger (19), a condensed water removing operation is performed in which the flow rate of the air (A) passing through the heat exchanger (19) is increased stepwise. An air conditioner indoor unit comprising a control means (75a).   The indoor unit according to claim 1, wherein the control means (75a) increases the flow rate stepwise while maintaining the flow rate at each stage for a predetermined time in the condensed water removal operation.   The indoor unit according to claim 1 or 2, wherein the control means (75a) executes the condensed water removal operation when the flow rate of the air (A) is changed to a higher one.   The indoor unit according to claim 3, wherein the time when the flow velocity is changed to a higher one is when the operation is started, when the operation is restarted from a thermo-off state, or when the setting of the flow velocity is increased.   When the control means (75a) determines that condensed water (53) is generated in the heat exchanger (19) and determines that the condensed water (53) may be scattered, The indoor unit of Claim 1 or 2 which performs the said condensed water removal driving | operation.   The said control means (75a) raises the said flow rate in steps to the same value as the setting flow velocity of the normal driving | operation after the said condensed water removal driving | operation in the said condensed water removal driving | operation. Indoor unit.   The said control means (75a) raises the said flow rate in steps to the value which exceeds the setting flow rate of the normal operation after the said condensed water removal operation in the said condensed water removal operation. Indoor unit.   The heat exchanger (19) is a laminated heat having a refrigerant pipe (21) having a flat shape through which a refrigerant passes and a corrugated fin (45) disposed in contact with the refrigerant pipe (21). The indoor unit according to any one of claims 1 to 7, which is an exchanger (19).   The indoor unit according to claim 2, wherein, in the condensed water removal operation, the predetermined time for maintaining the flow velocity at each stage is set to 3 seconds or more and 60 seconds or less. A casing (15) having an inlet (11) and an outlet (13);
A blower that is disposed inside the casing (15), sucks indoor air into the casing (15) from the suction port (11), and blows it out of the casing (15) through the outlet (13). 17)
A heat exchanger (19) disposed inside the casing (15);
In order to remove the condensed water (53) generated in the heat exchanger (19), a control means (75a) for executing a condensed water removing operation for gradually increasing the rotational speed of the blower (17) is provided. Air conditioner indoor unit.   The indoor unit according to claim 10, wherein the control means (75a) increases the rotational speed stepwise by maintaining the rotational speed of the blower (17) at each stage for a predetermined time in the condensed water removal operation. .   The indoor unit according to any one of claims 1 to 11, wherein the heat exchanger (19) is disposed between the blower (17) and the outlet (13).   The air conditioner provided with the indoor unit (25) in any one of Claims 1-12, and the outdoor unit (73).

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