WO2019116602A1

WO2019116602A1 - Air conditioner

Info

Publication number: WO2019116602A1
Application number: PCT/JP2018/018512
Authority: WO
Inventors: 啓輔福原; 恒台坂
Original assignee: 日立ジョンソンコントロールズ空調株式会社
Priority date: 2017-12-13
Filing date: 2018-05-14
Publication date: 2019-06-20
Also published as: TWI650490B; JP2019105435A; JP6563156B1; FR3074882B1; WO2019116590A1; JPWO2019116602A1; MY173725A; TW201928211A; FR3074882A1

Abstract

An air conditioner comprising an indoor heat exchanger, an indoor fan, a condensation-receiving plate arranged under the indoor heat exchanger, and a fan cleaning unit (24b) that is arranged between the indoor heat exchanger and the indoor fan, and that cleans the indoor fan. An outside end section (50a) of a fan blade (50) of the indoor fan that makes contact with the fan cleaning unit (24b) is formed such that an uneven shape (50c) the distal end of which is uneven is formed continuously in the lengthwise direction.

Description

Air conditioner

The present invention relates to an air conditioner.

As background art of the present technical field, there is JP-A-2007-71210 (publication of patent No. 4046755) (patent document 1). This publication states that "the movable fan cleaning device for removing dust adhering to the fan is installed in the fan casing portion of the fluid feeding device" (see the abstract).

JP 2007-71210 A

Patent Document 1 discloses a fan cleaning device and a control device that controls the cleaning device. The operation by the control device includes a normal operation mode in which conditioned air is blown into the room and a fan cleaning operation mode in which the fan is rotated at low speed and the fan cleaning device is movable. The fan cleaning device includes a fan cleaning unit at its tip, and is movable to a position for retracting the fan cleaning unit in the fan cleaning operation mode.

However, in the fan cleaning device constituted by the fan cleaning portion and its holding portion, since the cleaning is performed only on the portion where the cleaning portion of the fan can interfere, the dust accumulated on the portion of the fan where the cleaning portion of the fan can not interfere It is difficult to remove.
Then, this invention makes it a subject to provide the air conditioner which can clean an indoor fan more effectively than before with a fan cleaning part.

In order to solve the above-mentioned subject, an air conditioner which is one form of the present invention is provided with an indoor heat exchanger, an indoor fan, and a fan cleaning part which cleans the indoor fan, and the above-mentioned fan blade of the indoor fan As for the outer end portion in contact with the fan cleaning portion, a concavo-convex shape in which the tip is concavo-convex is continuously formed in the longitudinal direction.

According to the present invention, it is possible to provide an air conditioner that can clean the indoor fan more effectively by the fan cleaning unit than in the prior art.
Problems, configurations, and effects other than those described above will be clarified by the description of the following embodiments.

It is a systematic diagram of the refrigerant circuit of the air conditioner concerning one Example of this invention. It is a longitudinal cross-sectional view of the indoor unit of the air conditioner concerning one Example of this invention. It is the perspective view which notched some indoor units of the air conditioner concerning one Example of this invention. It is a functional block diagram showing a control system of an air conditioner concerning one example of the present invention. It is an expansion perspective view of a part of outside end portion portion in a plurality of fan blades of an indoor fan in an air conditioner concerning one example of the present invention. It is the perspective view which looked a part of outer side edge part in one fan blade of the air conditioner concerning one Example of this invention from diagonally upward. It is the perspective view which looked at one part of the outer side edge part in the other example of one fan blade of the air conditioner which concerns on one Example of this invention from diagonally upward. It is an expansion perspective view of some fan blades in the indoor fan which is other example of composition of the air harmony machine concerning one example of the present invention. (A) is an enlarged perspective view of a portion of a plurality of fan blades in an indoor fan that is another configuration example of an air conditioner according to an embodiment of the present invention. (B) is a top view of the same fan blade. It is a perspective view which shows the contact | abutting condition of the fan blade and fan cleaning part of the air conditioner which concerns on one Example of this invention. It is a conceptual diagram which shows the support structure of the fan cleaning apparatus support shaft of the air conditioner concerning one Example of this invention. It is a perspective view of a portion of a fan blade showing an example in which a tip of an air conditioner concerning an example of the present invention has waveform shape. It is a flowchart of the process which the control part of the air conditioner concerning one Example of this invention performs. It is explanatory drawing which shows the state in process of cleaning of the indoor fan in the air conditioner concerning one Example of this invention. It is explanatory drawing which shows the state in process of thawing | decompression of the indoor heat exchanger 15 in the air conditioner concerning one Example of this invention. It is a flowchart explaining the process which the rotational speed control part of the air conditioner concerning one Example of this invention performs. It is a longitudinal cross-sectional view of the indoor unit of the air conditioner concerning the modification of one Example of this invention. It is a typical perspective view of the indoor fan and fan cleaning part with which the air harmony machine concerning another modification of one example of the present invention is provided.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
FIG. 1 is a system diagram of a refrigerant circuit Q of an air conditioner 100 according to the present embodiment. In addition, the solid line arrow of FIG. 1 has shown the flow of the refrigerant | coolant at the time of heating operation. Further, the broken line arrow in FIG. 1 indicates the flow of the refrigerant during the cooling operation.
As shown in FIG. 1, the air conditioner 100 includes a compressor 11, an outdoor heat exchanger 12, an outdoor fan 13, and an expansion valve 14. Moreover, the air conditioner 100 is equipped with the indoor heat exchanger 15, the indoor fan 16, and the four-way valve 17 other than the above-mentioned structure.

The compressor 11 is a device that compresses a low-temperature low-pressure gas refrigerant and discharges it as a high-temperature high-pressure gas refrigerant by driving the compressor motor 11 a.
The outdoor heat exchanger 12 is a heat exchanger that exchanges heat between the refrigerant flowing through the heat transfer pipe (not shown) and the outside air sent from the outdoor fan 13.
The outdoor fan 13 is a fan that sends outside air to the outdoor heat exchanger 12 by driving of the outdoor fan motor 13a, and is installed near the outdoor heat exchanger 12.

The expansion valve 14 is a valve that depressurizes the refrigerant condensed by the “condenser” (one of the outdoor heat exchanger 12 and the indoor heat exchanger 15 depending on the type of air conditioning operation). The refrigerant decompressed in the expansion valve 14 is led to the "evaporator" (the other of the outdoor heat exchanger 12 and the indoor heat exchanger 15 depending on the type of air conditioning operation).
The indoor heat exchanger 15 is a heat exchanger that exchanges heat between the refrigerant flowing through the heat transfer pipe g (see FIG. 2) and the indoor air (the air in the air conditioning target space) sent from the indoor fan 16. is there.
The indoor fan 16 is a fan that sends indoor air to the indoor heat exchanger 15 by driving of the indoor fan motor 16c (see FIG. 4), and is installed near the indoor heat exchanger 15. More specifically, the indoor fan 16 is disposed downstream of the indoor heat exchanger 15 in the flow of air when the indoor fan 16 is positively rotating.

The four-way valve 17 is a valve that switches the flow path of the refrigerant according to the operation mode of the air conditioner 100. For example, during the cooling operation (see the broken arrow in FIG. 1), the compressor 11, the outdoor heat exchanger 12 (condenser), the expansion valve 14, and the indoor heat exchanger 15 (evaporator) The refrigerant circulates in the refrigeration cycle in the refrigerant circuit Q sequentially connected in an annular fashion via the.
On the other hand, during the heating operation (see solid arrows in FIG. 1), the compressor 11, the indoor heat exchanger 15 (condenser), the expansion valve 14, and the outdoor heat exchanger 12 (evaporator) The refrigerant circulates in the refrigeration cycle in the refrigerant circuit Q sequentially connected in an annular fashion via the.
In the example shown in FIG. 1, the compressor 11, the outdoor heat exchanger 12, the outdoor fan 13, the expansion valve 14, and the four-way valve 17 are installed in the outdoor unit Uo. On the other hand, the indoor heat exchanger 15 and the indoor fan 16 are installed in the indoor unit Ui.

FIG. 2 is a longitudinal sectional view of the indoor unit Ui. Note that FIG. 2 illustrates a state in which the indoor fan 16 is not cleaned by the fan cleaning device 24. In addition to the indoor heat exchanger 15 and the indoor fan 16 described above, the indoor unit Ui includes the dew tray 18, the housing base 19, the

filters

20a and 20b, the front panel 21, the left and right wind direction plates 22, and the up and down wind direction A plate 23 and a fan cleaning device 24 are provided.

The indoor heat exchanger 15 has a plurality of fins f and a plurality of heat transfer pipes g penetrating the fins f. Moreover, if it demonstrates from another viewpoint, the indoor heat exchanger 15 has the front side indoor heat exchanger 15a and the rear side indoor heat exchanger 15b. The front indoor heat exchanger 15 a is disposed on the front side (indoor side) of the indoor fan 16. On the other hand, the rear side indoor heat exchanger 15 b is disposed on the rear side (wall side) of the indoor fan 16. And the upper end part of front side indoor heat exchanger 15a and the upper end part of rear side indoor heat exchanger 15b are connected.

The receiving pan 18 receives the condensed water of the indoor heat exchanger 15, and is disposed below the indoor heat exchanger 15 (in the example shown in FIG. 2, the front indoor heat exchanger 15a).
The indoor fan 16 is, for example, a cylindrical cross flow fan, and is disposed in the vicinity of the indoor heat exchanger 15. The indoor fan 16 includes a plurality of fan blades 50, partition plates 16a on which the fan blades 50 are installed, and an indoor fan motor 16c (see FIG. 4) which is a driving source.

The indoor fan 16 is preferably coated with a hydrophilic coating agent. As such a coating material, for example, one obtained by adding a binder (silicon compound having a hydrolysable group), butanol, tetrahydrofuran and an antibacterial agent to an isopropyl alcohol-dispersed silica sol which is a hydrophilic material may be used.

As a result, a hydrophilic film is formed on the surface of the indoor fan 16, so the electrical resistance value of the surface of the indoor fan 16 is reduced, and dust is less likely to adhere to the indoor fan 16. That is, since static electricity accompanying friction with air is less likely to be generated on the surface of the indoor fan 16 while the indoor fan 16 is driven, adhesion of dust to the indoor fan 16 can be suppressed. Thus, the coating agent described above also functions as an antistatic agent for the indoor fan 16.

The housing base 19 shown in FIG. 2 is a housing in which devices such as the indoor heat exchanger 15 and the indoor fan 16 are installed.
The filter 20 a is for removing dust from the air directed to the air suction port h 1 on the front side, and is installed on the front side of the indoor heat exchanger 15.
The filter 20 b is for removing dust from the air directed to the upper air suction port h 2, and is disposed on the upper side of the indoor heat exchanger 15.

The front panel 21 is a panel installed so as to cover the filter 20a on the front side, has a rotation shaft (not shown) at its lower end, and is pivotable to the front side. The front panel 21 may not be rotated.
The left and right wind direction plate 22 is a plate-like member that adjusts the flow of the air blown out into the room as the indoor fan 16 rotates. The left and right wind direction plate 22 is disposed in the blowout air path h3 and is configured to rotate in the left and right direction by the left and right wind direction plate motor 25 (see FIG. 5).

The vertical air flow direction plate 23 is a plate-like member that adjusts the vertical flow of air blown out into the room as the indoor fan 16 rotates. The vertical wind direction plate 23 is disposed in the vicinity of the air outlet h4, and is configured to be vertically rotated by a vertical wind direction plate motor 26 (see FIG. 5).
The air sucked in via the air suction ports h1 and h2 exchanges heat with the refrigerant flowing through the heat transfer pipe g of the indoor heat exchanger 15, and the heat-exchanged air is guided to the blowout air path h3. The air flowing through the blowout air path h3 is guided in a predetermined direction by the left and right wind direction plates 22 and the up and down wind direction plates 23, and is further blown out into the room through the air outlet h4.

Note that most of the dust traveling toward the air suction ports h1 and h2 with the flow of air is collected by the

filters

20a and 20b. However, fine dust may pass through the

filters

20 a and 20 b and adhere to the indoor heat exchanger 15 and the indoor fan 16. Therefore, it is desirable to periodically clean the indoor heat exchanger 15 and the indoor fan 16. Therefore, in the present embodiment, after the indoor fan 16 is cleaned using the fan cleaning device 24 described below, the indoor heat exchanger 15 is flushed with water.

The fan cleaning device 24 shown in FIG. 2 cleans the indoor fan 16 and is disposed between the indoor heat exchanger 15 and the indoor fan 16. Describing in more detail, the fan cleaning device 24 is disposed at a position closer to the indoor fan 16 than the recess r of the front indoor heat exchanger 15a having a <-shaped in vertical cross section. In the example shown in FIG. 2, the indoor heat exchanger 15 (the lower portion of the front indoor heat exchanger 15 a) is present below the fan cleaning device 24, and the dew pan 18 is present.

FIG. 3 is a perspective view in which a portion of the indoor unit Ui is cut away. The fan cleaning device 24 includes a fan cleaning motor 24c (see FIG. 4) in addition to the support shaft 24a and the fan cleaning portion 24b shown in FIG. The support shaft 24a is an axial member parallel to the axial direction of the indoor fan 16, and both ends thereof are axially supported (not shown in FIG. 3).

The fan cleaning portion 24 b is for removing dust attached to the fan blade 50, and the base end portion is supported by the support shaft 24 a. The fan cleaning portion 24b can be configured by a brush, a rubber, flexible blade, or the like. That is, as long as the fan cleaning portion 24b is a member that can scrape off the dust attached to the fan blade 50, various members may be used.
The fan cleaning motor 24c (see FIG. 4) is, for example, a stepping motor, and has a function of rotating the support shaft 24a by a predetermined angle.

When cleaning the indoor fan 16 by the fan cleaning device 24, the fan cleaning motor 24c (see FIG. 4) is driven such that the fan cleaning portion 24b contacts the indoor fan 16 (see FIG. 14A), The indoor fan 16 is reversely rotated. Then, when the cleaning of the indoor fan 16 by the fan cleaning device 24 is completed, the fan cleaning motor 24c is driven again, the fan cleaning portion 24b is rotated, and the fan cleaning portion 24b is separated from the indoor fan 16 ( See Figure 2).

In the present embodiment, as shown in FIG. 2 and FIG. 3, the tip of the fan cleaning portion 24 b is directed vertically downward except when the indoor fan 16 is cleaned. Specifically, except at the time of cleaning of the indoor fan 16 (including during normal air conditioning operation), the tip of the fan cleaning portion 24b is separated from the indoor fan 16 in a state where the tip of the fan cleaning portion 24b is directed substantially vertically downward. In addition, except at the time of cleaning of the indoor fan 16, it is not limited that the end of the fan cleaning portion 24b is directed vertically downward. For example, the tip of the fan cleaning portion 24b may be positioned substantially horizontal in the longitudinal direction toward the front indoor heat exchanger 15a. Alternatively, the longitudinal direction of the fan cleaning portion 24b may be positioned at an acute angle with the vertical direction. In this case, the front end side of the fan cleaning portion 24b may be close to the front indoor heat exchanger 15a, or may be close to the indoor fan 16 side. The following description will be made on the assumption that the tip of the fan cleaning portion 24b is separated from the indoor fan 16 with the tip of the fan cleaning portion 24b facing substantially vertically downward except at the time of cleaning the indoor fan 16.

FIG. 4 is a functional block diagram showing a control system of the air conditioner 100. As shown in FIG. The indoor unit Ui shown in FIG. 4 includes a remote control transmission / reception unit 27 and an indoor control circuit 31 in addition to the above-described configuration.
The remote control transmission / reception unit 27 exchanges predetermined information with the remote control 40.

Although not shown, the indoor control circuit 31 includes electronic circuits such as a central processing unit (CPU), a read only memory (ROM), a random access memory (RAM), and various interfaces. Then, the program stored in the ROM is read and expanded in the RAM, and the CPU executes various processing.
As shown in FIG. 4, the indoor control circuit 31 includes a storage unit 31 a and an indoor control unit 31 b.

The storage unit 31a stores, in addition to a predetermined program, data received through the remote control transmission / reception unit 27, detection values of various sensors (not shown), and the like.
The indoor control unit 31b controls the fan cleaning motor 24c, the indoor fan motor 16c, the left and right air direction plate motor 25, the upper and lower air direction plate motor 26, and the like based on the data stored in the storage unit 31a.

The outdoor unit Uo includes an outdoor control circuit 32 in addition to the above-described configuration. Although not shown, the outdoor control circuit 32 includes electronic circuits such as a CPU, a ROM, a RAM, and various interfaces, and is connected to the indoor control circuit 31 via a communication line. As shown in FIG. 4, the outdoor control circuit 32 includes a storage unit 32 a and an outdoor control unit 32 b.

The storage unit 32a stores, in addition to a predetermined program, data received from the indoor control circuit 31 and the like. The outdoor control unit 32b controls the compressor motor 11a, the outdoor fan motor 13a, the expansion valve 14, and the like based on the data stored in the storage unit 32a. Hereinafter, the indoor control circuit 31 and the outdoor control circuit 32 are collectively referred to as a "control unit 30".

By the way, Patent Document 1 mentioned above discloses a fan cleaning device and a control device for controlling the cleaning device. The operation by the control device includes a normal operation mode in which conditioned air is blown into the room and a fan cleaning operation mode in which the fan is rotated at low speed and the fan cleaning device is movable. The fan cleaning device includes a fan cleaning unit at its tip, and is movable to a position for retracting the fan cleaning unit in the fan cleaning operation mode.
However, in the fan cleaning device constituted by the fan cleaning portion and its holding portion, since cleaning is performed only on the portion where the cleaning portion of the fan can interfere, dust accumulated on the portion of the fan where the fan cleaning portion can not interfere is removed It is difficult to do.

Also in the air conditioner 100 of the present embodiment, the fan cleaning portion 24 b contacts only the outer end 50 a (see FIG. 2) of each fan blade 50 in the cylindrical indoor fan 16. The fan cleaning portion 24b can not enter into the inner side 50k (see FIG. 2) of each fan blade 50 and can not scrape off the dust attached to each fan blade 50.

Therefore, in the present embodiment, the structure and the like of the outer end portion 50 a of each fan blade 50 are devised. Thus, in the present embodiment, the indoor fan 16 can be cleaned more effectively than in the prior art by, for example, concentrating dust entering the indoor fan 16 on the outer end 50 a of each fan blade 50 as much as possible. I did it. Below, the structure which concerns is demonstrated.

FIG. 5 is an enlarged perspective view of a part of the outer end 50 a of the plurality of fan blades 50 of the indoor fan 16. Arrow a indicates the longitudinal direction of fan blade 50. Arrow b indicates the rotation direction of the indoor fan 16.
FIG. 6 is a perspective view of a part of the outer end 50 a of one fan blade 50 as viewed obliquely from above.

First, the outer end 50a of the indoor fan 16 in contact with the fan cleaning portion 24b of the fan blade 50 is formed continuously in the longitudinal direction (arrow a direction) with an uneven shape 50c where the tip 50b is uneven. Although the concavo-convex shape 50c shown in the example of FIGS. 5 and 6 is relatively angled, the concavo-convex shape 50c can be formed into various concavo-convex shapes such as corrugating or sawing.

In the convex-concave shape 50c, the tip end surface 50d may include, in the convex portion 50f, a portion having a curvature larger than that of the concave portion 50e. Describing specifically with the example of FIG. 6, in the concavo-convex shape 50c, two corner portions 50g are formed by one convex portion 50f of the concavo-convex shape 50c. On the other hand, the concave portion 50e has a substantially arc shape. Due to the difference in the shape of the convex portion 50f and the concave portion 50e, the convex-concave shape 50c includes, in the convex portion 50f, a portion where the tip surface 50d has a curvature larger than that of the concave portion 50e.

Further, as shown in FIG. 6, the surface roughness of the outer end 50 a may be rougher than the surface roughness of the other portion (inner side 50 k) of the fan blade 50. Specifically, in the example of FIG. 6, the fine convex portion 50h is formed on the entire surface of the outer end 50a, while the inner side 50k has almost no unevenness, so the outer end 50a is Surface roughness is rougher than the surface roughness at the inner side 50k. As shown in FIG. 7, a plurality of dimples 50i may be formed on the outer end 50a instead of the fine convex portion 50h, and various means for enhancing the surface roughness of the outer end 50a may be used. Means can be used. Further, in the examples of FIGS. 6 and 7, although the fine convex portions 50h and the dimples 50i are illustrated only on the side surface of the fan blade 50, it goes without saying that they may be formed on the tip edge surface 50d.

FIG. 8 is an enlarged perspective view of a portion of the plurality of fan blades 50 in the indoor fan 16 as another configuration example. As shown in FIG. 8, the fan blades 50 of the indoor fan 16 are adjacent to each other in the rotational direction (arrow b direction), and the concavo-convex shape 50 c is in the longitudinal direction of the fan blade 50 when viewed in the rotational direction (arrow b direction). It may be offset. In the example of FIG. 8, when the uneven shape 50c of the row of fan blades 50 in the indoor fan 16 is viewed in the direction of the arrow b, a convex portion 50f appears next to the appearance of the concave portion 50e, and further next to it The concave portion 50e appears again. That is, the concave portions 50e and the convex portions 50f appear alternately. In the example of FIG. 8, the concavo-convex shape 50 c is completely shifted in the longitudinal direction of the fan blade 50 as viewed in the rotational direction (arrow b direction). However, this may be partially offset. That is, when the uneven shape 50c is viewed in the direction of the arrow b, the concave portions 50e may overlap only partially with the adjacent fan blades 50, and the convex portions 50f may overlap only partially.

Furthermore, the uneven shape 50 c may not necessarily be shifted in the longitudinal direction of the fan blades 50 between the adjacent fan blades 50. That is, in the fan blades 50 (for example, two sheets or three sheets) continuously adjacent to each other, the uneven shape 50 c may be in the longitudinal direction of the fan blade 50. The uneven shape 50 c may be shifted in the longitudinal direction of the fan blade 50 when the next consecutive fan blades 50 (for example, two or three) are reached.

FIG. 9A is an enlarged perspective view of a part of a plurality of fan blades in an indoor fan that is another example of the configuration of the air conditioner according to one embodiment of the present invention. FIG. 9 (b) is a top view of the one fan blade. As shown in FIG. 9, in the concavo-convex shape 50c, the surface direction of the tip end surface 50d of the side portion 50j of the convex portion 50f may form an acute angle or an obtuse angle with the longitudinal direction of the fan blade 50. In the example of FIG. 9, the surface direction of the leading edge surface 50 d at the side 50 j forms an acute angle θ with the longitudinal direction of the fan blade 50.

FIG. 10 is a perspective view showing the contact state between the fan blade 50 and the fan cleaning portion 24b. As shown in FIG. 10, it is desirable for the fan cleaning portion 24b to have its tip 24b1 reach at least the lower end (indicated by a broken line c) of the concave portion 50e of the concavo-convex shape 50c. In the example of FIG. 10, the fan cleaning portion 24b shows an example in which the tip 24a1 reaches the inner side 50k of the fan blade 50 further than the lower end indicated by the broken line c of the concave portion 50e.

FIG. 11 is a conceptual view showing a support structure of the support shaft 24 a of the fan cleaning device 24. Both ends of the support shaft 24 a of the fan cleaning device 24 are rotatably supported by a pair of bearing members 24 d provided at predetermined positions of the housing base 19 of the air conditioner 100. Further, there is a play shown by a symbol d in the bearing member 24d, and the support shaft 24a and hence the fan cleaning portion 24b are movable in the longitudinal direction of the indoor fan 16 by a predetermined distance within the range of the play to the bearing member 24d. It may be supported.

FIG. 12 is a perspective view of a portion of the fan blade 50 showing an example in which the tip has a corrugated shape. That is, as described above, the outer end 50a portion of the fan blade 50 may have a corrugated shape as shown in FIG. 12 instead of the angular shape unlike the example of FIG. On the surface of the outer end portion 50a, there are formed a plurality of recessed grooves 50l having a direction substantially orthogonal to the longitudinal direction of the fan blade 50 as a length direction.

In each of the examples shown in FIGS. 5 to 10, when the tip end surface 50d of each convex portion 50f is connected, it has a wave shape as shown by a broken line e in FIG.
Returning to FIG. 4, the indoor control unit 31 b includes a rotational speed control unit 31 b 1. The rotational speed control unit 31b1 controls the rotational speed of the indoor fan motor 16c when cleaning is performed by the fan cleaning device 24 (described later).

Next, the operation and effect of the air conditioner 100 will be described.
FIG. 13 is a flowchart of processing performed by the control unit 30 (see FIG. 2 as appropriate). It is assumed that the air conditioning operation is not performed at the time of “START” in FIG. 13 and that the tip of the fan cleaning portion 24b is directed substantially vertically downward (the state shown in FIGS. 2 and 3).
In step S101 of FIG. 13, the control unit 30 cleans the indoor fan 16 by the fan cleaning device 24. In addition, as a trigger which starts cleaning of the indoor fan 16, the conditions that the integral time of the air conditioning driving | running | working from the time of last cleaning reaches the predetermined time are mentioned, for example.

FIG. 14A is an explanatory view showing a state in which the indoor fan 16 is being cleaned. In FIG. 14A, the indoor heat exchanger 15, the indoor fan 16, and the pan 18 are illustrated, and illustration of the other members is omitted.
The control unit 30 brings the fan cleaning unit 24b into contact with the indoor fan 16, and rotates (reversely rotates) the indoor fan 16 in the opposite direction to that in the normal air conditioning operation.
That is, the control unit 30 rotates about 90 ° around the support shaft 24a from the state where the front end of the fan cleaning unit 24b is directed vertically downward (see FIGS. 2 and 3), and the front end of the fan cleaning unit 24b is It faces the indoor fan 16 (see FIG. 14A). As a result, the fan cleaning portion 24 b contacts the fan blade 50 of the indoor fan 16.

In the example of FIG. 14A, as indicated by the alternate long and short dash line L, the indoor heat exchanger 15 (the front indoor heat exchanger 15a) is located below the contact position K with the fan cleaning unit 24b in contact with the indoor fan 16. Exist, and the pan 18 also exists.
Since the indoor fan 16 is rotating in the reverse direction, the tip of the fan cleaning portion 24b is flexed with the movement of the fan blade 50, and the fan cleaning portion 24b is pressed so as to stroke the back surface of the fan blade 50. Then, dust collected on the outer end 50 a (radial end) of the fan blade 50 is removed by the fan cleaning portion 24 b.

In the present embodiment, as described above, the fan cleaning portion 24b is brought into contact with the fan blade 50, and the indoor fan 16 is reversely rotated. As a result, the fan cleaning portion 24b contacts the outer end 50a of the rear surface of the fan blade 50, and the dust accumulated on both the outer end 50a of the belly and the rear surface of the fan blade 50 is integrally removed.

Here, dust such as fine thread dust intrudes into the indoor fan 16. Then, although the dust attached to the fan blade 50 is cleaned by the fan cleaning portion 24 b, the fan cleaning portion 24 b does not reach the entire surface of the fan blade 50. It is desirable that dust not adhere to the portion of the fan blade 50 which the fan cleaning portion 24b does not reach as much as possible.

Therefore, as shown in FIGS. 5 and 6, in the present embodiment, the outer end 50a of the fan blade 50 in contact with the fan cleaning portion 24b is configured as follows. That is, the uneven shape 50c in which the tip 50b of the fan blade 50 is uneven is continuously formed in the longitudinal direction (arrow a direction). As a result, most of the dust entering the indoor fan 16 is entangled in the uneven shape 50 c and relatively hardly adheres to the inside 50 k of the fan blade 50. That is, the dust entering into the indoor fan 16 first passes through the outer end 50 a of the fan blade 50. Therefore, the asperity shape 50c is formed in the outer end portion 50a so that as much dust as possible can be entangled in the asperity shape 50c. Therefore, it is possible to remove a large amount of dust entering the interior of the indoor fan 16 by the fan cleaning portion 24b, and it is possible to effectively clean the portion of the fan blade 50 which the fan cleaning portion 24b does not reach.

As described above, the convex-concave shape 50c is such that the tip end surface 50d includes, in the convex portion 50f, a portion having a curvature larger than that of the concave portion 50e. As a result, dust can be easily captured by the convex portion 50f including the angular portion more than the concave portion 50e, and the convex-concave shape 50c can be effectively captured by the concave-convex shape 50c.
For example, as shown in FIG. 6, in the convex portion 50f of the uneven shape 50c, two corner portions 50g are formed by one convex portion 50f. On the other hand, the concave portion 50e has a substantially arc shape. The dust easily catches on the corner 50g, and the dust can be effectively captured.

Further, as shown in FIG. 6, the surface roughness of the outer end 50 a is made rougher than the surface roughness of the other portion (inner side 50 k) of the fan blade 50. That is, in the example of FIG. 6, the fine convex portion 50h is formed on the entire surface of the outer end 50a, while the inner side 50k has almost no unevenness, so the surface roughness of the outer end 50a The height is rougher than the surface roughness at the inner side 50k. As described above, by making the surface roughness of the outer end 50a of the fan blade 50, dust is easily caught on the outer end 50a, and dust can be effectively captured. Further, in order to make the surface roughness of the outer end 50a of the fan blade 50, as shown in FIG. 7, the surface roughness of the outer end 50a of the fan blade 50 may be roughened by forming the dimples 50i.

Furthermore, as shown in FIG. 8, the fan blades 50 of the indoor fan 16 are adjacent to each other in the rotational direction (arrow b direction), and the concavo-convex shape 50 c is in the rotational direction (arrow b direction). Misaligned in the direction.
That is, when the indoor fan 16 is rotated to generate a wind, air is released at the concave portion 50e of the uneven shape 50c and the wind can not be generated. That is, by providing the uneven shape 50 c at the outer end 50 a of the fan blade 50, there is a possibility that the blowing capacity of the indoor fan 16 may be reduced.

However, in the example of FIG. 8, the concavo-convex shape 50 c is shifted in the longitudinal direction of the fan blade 50 as viewed in the rotational direction among the members adjacent in the rotational direction. Therefore, even if the wind escapes at the concave portion 50e of the first fan blade 50 of the rotating indoor fan 16, since the convex portion 50f of the next fan blade 50 comes to the same position, the wind can be generated. . Therefore, the reduction of the blowing capacity of the indoor fan 16 can be suppressed.

In the example of FIG. 8, the concavo-convex shape 50 c is completely shifted in the longitudinal direction of the fan blade 50 as viewed in the rotational direction. However, this may be partially offset. That is, when the uneven shape 50c is viewed in the direction of the arrow b, the concave portions 50e may overlap only partially with the adjacent fan blades 50, and the convex portions 50f may overlap only partially. Even in this case, it is possible to suppress the reduction of the blowing capacity of the indoor fan 16.

Furthermore, in the fan blades 50 (for example, two or three) continuously adjacent to each other, the uneven shape 50 c may be aligned with the longitudinal direction of the fan blades 50. The uneven shape 50 c may be shifted in the longitudinal direction of the fan blade 50 when the next consecutive fan blades 50 (for example, two or three) are reached. Even in this case, it is possible to suppress the reduction of the blowing capacity of the indoor fan 16.

Furthermore, as shown in FIG. 9, in the uneven shape 50c, the surface direction of the tip edge surface 50d at the side portion 50j of the convex portion 50f forms an acute angle or an obtuse angle with the longitudinal direction of the fan blade 50. In the example of FIG. 9, the surface direction of the leading edge surface 50 d at the side 50 j forms an acute angle θ with the longitudinal direction of the fan blade 50.
With this configuration, the shape viewed from the top of the tip of the convex portion 50f becomes substantially rhombus, and the width of the convex portion 50f in the lateral direction (longitudinal direction of the fan blade 50) is expanded to form the convex portion 50f. Area can be increased. Therefore, the area where the convex portion 50f scratchs the wind can be increased, so that the reduction of the blowing capacity of the indoor fan 16 can be suppressed.

Further, as shown in FIG. 10, in the fan cleaning portion 24b, the tip end 24a1 reaches at least the lower end (indicated by a broken line c) of the concave portion 50e in the concavo-convex shape 50c. By this, it is possible to effectively remove the dust entwined by the uneven shape 50 c.

Furthermore, as shown in FIG. 11, both ends of the support shaft 24a of the fan cleaning device 24 are rotatably supported by the pair of bearing members 24d, respectively. There is.
That is, without this play, the portion of the fan cleaning portion 24b in contact with each portion of the concavo-convex shape 50c is always constant, and a secular change causes the fan cleaning portion 24b to bend in a specific shape, and the fan cleaning portion The cleaning effect of the fan blade 50 by 24 b is reduced. In other words, the fan cleaning device 24 needs to be replaced early.

On the other hand, when there is a play indicated by reference sign d in the bearing member 24d, the fan cleaning portion 24b moves to some extent in the axial direction of the support shaft 24a while the indoor fan 16 is being cleaned. Therefore, the portion of the fan cleaning portion 24b in contact with each portion of the concavo-convex shape 50c is not always constant, and it is difficult for the fan cleaning portion 24b to bend in a specific shape due to aging. Thus, the fan cleaning device 24 can be used for a long time, and the possibility of early replacement is reduced.

The concavo-convex shape 50c does not have to be an angular concavo-convex shape as shown in FIGS. 5 to 10, and as shown in FIG. 12, even if it has a corrugated shape, as shown in FIG. The same effect can be achieved.
In this case, as shown in FIG. 12, a plurality of recessed grooves 50l may be formed on the surface of the outer end portion 50a with the direction substantially orthogonal to the longitudinal direction of the fan blade 50 as the length direction. . That is, dust can be easily caught by the concave groove 50l, and the dust can be easily entangled.

Furthermore, as shown in FIG. 4, the indoor control unit 31 b includes a rotational speed control unit 31 b 1. FIG. 15 is a flowchart for explaining the process performed by the rotational speed control unit 31b1. As shown in FIG. 15, such processing is performed while cleaning the indoor fan 16 shown in S101 and described above (Yes in S111). That is, during the cleaning of the indoor fan 16, the indoor fan 16 is reversely rotated as described above. The indoor control unit 31b sets the rotational speed of the indoor fan 16 being cleaned to a speed higher than the minimum rotational speed during the air conditioning operation (S112). Here, "at the time of air conditioning operation" is when performing a cooling operation, a heating operation, a dehumidifying operation and the like. That is, although the minimum rotational speed preset when performing these operations exists, the rotational speed of the indoor fan 16 being cleaned is made higher than the speed.
Thus, by keeping the rotational speed of the indoor fan 16 being cleaned at a high speed to some extent, the wind noise generated when the uneven shape 50c cuts the wind when the indoor fan 16 rotates and the indoor fan 16 contact the fan cleaning portion 24b. By doing this, it is possible to suppress the intermittent sound generated.

In addition, by rotating the indoor fan 16 reversely, a gentle flow of air in the reverse direction to that at the time of normal rotation (see FIG. 4) is generated inside the indoor unit Ui (see FIG. 2). Therefore, the dust j removed from the indoor fan 16 does not go to the air outlet h4 (see FIG. 2), as shown in FIG. 14A, through the gap between the front indoor heat exchanger 15a and the indoor fan 16. Are led to the pan 18.

More specifically, the dust j removed from the indoor fan 16 by the fan cleaning unit 24 b is lightly pressed against the front indoor heat exchanger 15 a by wind pressure. Further, the dust j drops onto the pan 18 along the sloped surface (the edge of the fin f) of the front indoor heat exchanger 15a (see the arrow in FIG. 14A). Therefore, the dust j hardly adheres to the back surface of the vertical wind direction plate 23 (see FIG. 2) through the minute gap between the indoor fan 16 and the pan 18. This can prevent the dust j from being blown into the room during the next air conditioning operation.
In addition, there is also a possibility that a part of the dust j removed from the indoor fan 16 may adhere to the front indoor heat exchanger 15 a without falling to the dew receiving pan 18. The dust j attached to the front indoor heat exchanger 15a as described above is washed away in the process of step S103 described later.

After the process of step S101 of FIG. 13 is completed, the control unit 30 moves the fan cleaning device 24 in step S102. That is, the control unit 30 rotates the fan cleaning unit 24b by 90 ° around the support shaft 24a from the state where the tip of the fan cleaning unit 24b faces the indoor fan 16 (see FIG. 14A). The tip is directed substantially vertically downward (see FIG. 14B).
Next, in step S103, the control unit 30 sequentially freezes and thaws the indoor heat exchanger 15. First, the control unit 30 causes the indoor heat exchanger 15 to function as an evaporator, and causes the indoor heat exchanger 15 to frost the water contained in the air taken into the indoor unit Ui and freeze it.

When freezing the indoor heat exchanger 15, the control unit 30 preferably lowers the evaporation temperature of the refrigerant flowing into the indoor heat exchanger 15. That is, when the control unit 30 causes the indoor heat exchanger 15 to function as an evaporator and freezes the indoor heat exchanger 15 (condensed water adheres), the evaporation temperature of the refrigerant is larger than that during normal air conditioning operation. The pressure of the refrigerant flowing into the indoor heat exchanger 15 is adjusted to be low.
For example, the control unit 30 causes the refrigerant having a low pressure and a low evaporation temperature to flow into the indoor heat exchanger 15 by reducing the opening degree of the expansion valve 14 (see FIG. 1). As a result, frost and ice (symbol i shown in FIG. 14B) are easily grown in the indoor heat exchanger 15. Therefore, the indoor heat exchanger 15 can be washed away with a large amount of water during the subsequent thawing.

Moreover, in the indoor heat exchanger 15, the area located below the fan cleaning device 24 is not the downstream of the flow of the refrigerant flowing through the indoor heat exchanger 15 (that is, the upstream or the midstream). Is preferred. As a result, since the low temperature gas-liquid two-phase refrigerant flows at least under (downward) the fan cleaning device 24, the thickness of the frost or ice adhering to the indoor heat exchanger 15 can be increased. Therefore, during the subsequent thawing, the indoor heat exchanger 15 can be flushed with a large amount of water.

In the region located below the fan cleaning device 24 in the indoor heat exchanger 15, dust scraped off the indoor fan 16 by the fan cleaning device 24 is likely to be attached. Therefore, frost and ice are more likely to grow by flowing a low temperature gas-liquid two-phase refrigerant to the area located below the fan cleaning device 24 in the indoor heat exchanger 15, and further, melting these frost and ice. The dust of the indoor heat exchanger 15 can be properly washed away.

In addition, when the indoor heat exchanger 15 is made to function as an evaporator and the indoor heat exchanger 15 is frozen (condensed water is attached), the control unit 30 may close the upper and lower wind direction plates 23 (see FIG. 2) Alternatively, it is preferable to make the angle of the up and down wind direction plate 23 upward than the horizontal. As a result, it is possible to suppress that the low temperature air cooled by the indoor heat exchanger 15 leaks into the room, and to freeze the indoor heat exchanger 15 or the like in a state comfortable for the user.

After freezing the indoor heat exchanger 15 (S103 in FIG. 13) in this manner, the control unit 30 thaws the indoor heat exchanger 15 (S103). For example, the control unit 30 naturally thaws the indoor heat exchanger 15 at room temperature by maintaining the stopped state of each device. The control unit 30 may melt the frost or ice attached to the indoor heat exchanger 15 by performing a heating operation or a blowing operation.
FIG. 14B is an explanatory view showing a state in which the indoor heat exchanger 15 is being thawed. As the indoor heat exchanger 15 is thawed, frost and ice adhering to the indoor heat exchanger 15 melt, and a large amount of water w flows along the fins f and flows down to the pan 18. Thereby, the dust j attached to the indoor heat exchanger 15 can be washed away during the air conditioning operation.

Further, along with the cleaning of the indoor fan 16 by the fan cleaning unit 24b, the dust j attached to the front indoor heat exchanger 15a is also washed away and flows down to the drain pan 18 (see the arrow in FIG. 14B). The water w which has fallen to the drain pan 18 in this manner, together with dust j (see FIG. 14A) which has fallen directly to the drain pan 18 during cleaning of the indoor fan 16, is externally provided via a drain hose (not shown). Discharged into A large amount of water flows down from the indoor heat exchanger 15 during thawing, and there is almost no risk that the drain hose or the like (not shown) will be clogged with dust j.
Although not shown in FIG. 13, after the freezing and thawing (S103) of the indoor heat exchanger 15 is performed, the control unit 30 performs the heating operation or the blowing operation to dry the inside of the indoor unit Ui. May be By this, it can suppress that microbes breed in indoor heat exchanger 15 grade | etc.,.

According to the present embodiment, since the indoor fan 16 is cleaned by the fan cleaning device 24 (S101 in FIG. 13), it is possible to suppress the dust j from being blown into the room. Further, since the fan cleaning device 24 is disposed between the front indoor heat exchanger 15 a and the indoor fan 16, the dust j scraped off by the fan cleaning portion 24 b from the indoor fan 16 can be guided to the dew tray 18. .
Further, while the indoor fan 16 is being cleaned, the control unit 30 reversely rotates the indoor fan 16. This can prevent the dust j from traveling toward the air outlet h4.

Incidentally, if a large amount of dust adheres to the indoor fan 16, in some cases, the temperature at which the air is blown out may be lowered to compensate for the performance degradation of the indoor fan 16 during the cooling operation, which may cause the indoor air to be exposed. is there. On the other hand, in the present embodiment, as described above, since the indoor fan 16 is properly cleaned, the reduction in air volume of the indoor fan 16 due to the adhesion of dust is suppressed. Therefore, according to the present embodiment, it is possible to prevent the dripping due to the dust of the indoor fan 16.

Further, the control unit 30 sequentially freezes and thaws the indoor heat exchanger 15 (S103 in FIG. 13), so that the dust j attached to the indoor heat exchanger 15 is washed away with water w, and the dew tray 18 is removed. Flow down. Thus, according to the present embodiment, the indoor fan 16 can be kept clean, and the indoor heat exchanger 15 can also be kept clean. Therefore, comfortable air conditioning can be performed by the air conditioner 100. In addition, it is possible to reduce the time and effort for the user required for cleaning the indoor heat exchanger 15 and the indoor fan 16 and the expense for maintenance.

As mentioned above, although the Example demonstrated about the air conditioner 100 which concerns on this invention, this invention is not limited to these description, A various change can be made.
FIG. 16 is a longitudinal sectional view of an indoor unit UAi of an air conditioner according to a modification of the present embodiment. In the modification shown in FIG. 16, a groove member M having a concave shape in a longitudinal sectional view is disposed below the front indoor heat exchanger 15 a. Further, a rib 28 extending upward from the bottom surface of the groove member M is installed in the groove member M. The other points are the same as in the embodiment.

In the groove member M shown in FIG. 16, the front portion of the rib 28 functions as a dew receiving portion 18 </ b> A that receives the condensed water of the indoor heat exchanger 15. Further, in the groove member M, a portion on the rear side of the rib 28 functions as a dust receiving portion 29 that receives dust dropped from the indoor heat exchanger 15 or the indoor fan 16. The dust receiver 29 is disposed below the indoor heat exchanger 15.

Further, the indoor heat exchanger 15 (the lower portion of the front indoor heat exchanger 15a) is present below the fan cleaning portion 24b, and the dust receiving portion 29 is also present. More specifically, although not shown, the indoor heat exchanger 15 exists below the contact position of the fan cleaning unit 24b in contact with the indoor fan 16, and the dust receiver 29 also exists. ing. Even if it is such composition, the same effect as an above-mentioned example is produced.

At the time of thawing of the indoor heat exchanger 15, the water flows down to the dew receiving portion 18A, and the water also flows down to the dust receiving portion 29. Therefore, there is no possibility that the discharge of the dust collected in the dust receiving portion 29 will be disturbed.
Moreover, in the example shown in FIG. 16, although the upper end of the rib 28 is not contacting the front side indoor heat exchanger 15a, it does not restrict to this. That is, the upper end of the rib 28 may be in contact with the front indoor heat exchanger 15a.

FIG. 17 is a schematic perspective view of the indoor fan 16 and the fan cleaning portion 24A provided in the air conditioner according to another modification of the present embodiment. In the modification shown in FIG. 17, the length of the fan cleaning portion 24A in the direction parallel to the axial direction of the indoor fan 16 is shorter than the axial length of the indoor fan 16 itself. This point differs from the fan cleaning unit 24b described above. The other members having the same reference numerals as those in FIG. 11 correspond to the members described above with reference to FIG. Then, during the cleaning of the indoor fan 16, the fan cleaning portion 24A moves in the axial direction of the indoor fan 16 (left and right direction when viewed from the front of the indoor unit). That is, in the axial direction of the indoor fan 16, the indoor fan 16 is sequentially cleaned in each predetermined region corresponding to the length of the fan cleaning portion 24A. As described above, by moving the fan cleaning portion 24A whose length is relatively short, the manufacturing cost of the air conditioner can be reduced as compared with the above embodiment.

A rod (not shown) extending parallel to the support shaft 24a is provided in the vicinity of the fan cleaning portion 24A (for example, the upper side of the support shaft 24a), and a predetermined moving mechanism (not shown) The fan cleaning unit 24A may be moved. In addition, after cleaning by the fan cleaning unit 24A, a moving mechanism (not shown) may rotate or translate the fan cleaning unit 24A appropriately to retract the fan cleaning unit 24A from the indoor fan 16.

In the above embodiment, the control unit 30 causes the fan cleaning device 24 to contact the indoor fan 16 and rotates (reversely rotates) the indoor fan 16 in the opposite direction to the normal air conditioning operation. Not exclusively. That is, the control unit 30 may cause the fan cleaning device 24 to be in contact with the indoor fan 16 and cause the indoor fan 16 to rotate (forward rotation) in the same direction as that during normal air conditioning operation.
As described above, by bringing the indoor fan 16 into contact with the fan cleaning portion 24 b and rotating the indoor fan 16 forward, dust attached to the vicinity of the tip of the belly of the fan blade 50 is effectively removed. Moreover, since the circuit element for reversely rotating the indoor fan 16 becomes unnecessary, the manufacturing cost of the air conditioner 100 can be reduced.

Moreover, although the said Example demonstrated the structure which the fan cleaning part 24b rotates centering | focusing on the support shaft 24a of the fan cleaning apparatus 24, it does not restrict to this. For example, when cleaning the indoor fan 16, the control unit 30 may move the support shaft 24 a toward the indoor fan 16 and cause the fan cleaning unit 24 b to contact the indoor fan 16. Then, after cleaning of the indoor fan 16 is completed, the control unit 30 may retract the support shaft 24 a and separate the fan cleaning unit 24 b from the indoor fan 16.

Moreover, in the said Example, although the area | region located below the fan cleaning apparatus 24 in the indoor heat exchanger 15 demonstrated the structure which is not a downstream of the flow of a refrigerant | coolant, it does not restrict to this. For example, in the indoor heat exchanger 15, the area whose height is higher than the fan cleaning device 24 is not the downstream of the flow of the refrigerant flowing through the indoor heat exchanger 15 (that is, the upstream or midstream). It may be composition of. More specifically, in the front indoor heat exchanger 15a, an area located downstream of the flow of air during normal air conditioning operation, and whose area is higher than the fan cleaning device 24, is an indoor heat exchanger. Preferably it is not downstream of the flowing refrigerant flow. According to such a configuration, the front side indoor heat exchanger 15a is a region located on the downstream side of the flow of air during normal air conditioning operation (the right side of the drawing of the front side indoor heat exchanger 15a shown in FIG. 2) In the region where the height is higher than the fan cleaning device 24, thick frost adheres as the indoor heat exchanger 15 freezes. After that, when the indoor heat exchanger 15 is thawed, a large amount of water flows down along the fins f. As a result, the dust (including the dust removed from the indoor fan 16) adhering to the indoor heat exchanger 15 can be washed off to the drip pan 18.

Moreover, although the process which wash | cleans the indoor heat exchanger 15 by freezing etc. of the indoor heat exchanger 15 was demonstrated in the said Example, it does not restrict to this. For example, the indoor heat exchanger 15 may be condensed, and the indoor heat exchanger 15 may be cleaned with the condensed water (condensed water). For example, the control unit 30 calculates the dew point of the room air based on the temperature and the relative humidity of the room air. Then, the control unit 30 controls the opening degree and the like of the expansion valve 14 so that the temperature of the indoor heat exchanger 15 is equal to or lower than the above-described dew point and higher than a predetermined freezing temperature.
The above-mentioned "freezing temperature" is a temperature at which the moisture contained in the room air starts to freeze in the room heat exchanger 15 when the temperature of the room air is lowered. As described above, by causing the indoor heat exchanger 15 to condense, it is possible to wash off the dust of the indoor heat exchanger 15 with the condensed water (condensed water).
Alternatively, the control unit 30 may cause the indoor heat exchanger 15 to condense by performing a cooling operation or a dehumidifying operation, and the indoor heat exchanger 15 may be cleaned with the condensed water (condensed water).

Moreover, although the said Example (refer FIG. 2) demonstrated the structure in which the indoor heat exchanger 15 and the pan tray 18 exist under the fan cleaning apparatus 24, it does not restrict to this. That is, at least one of the indoor heat exchanger 15 and the pan 18 may be present below the fan cleaning device 24. For example, in a configuration in which the lower portion of the indoor heat exchanger 15 having a <-shape in vertical cross section extends in the vertical direction, the pan 18 may be present below (directly below) the fan cleaning device 24.
Moreover, although the structure which arrange | positions the fan cleaning apparatus 24 between the indoor heat exchanger 15 and the indoor fan 16 was demonstrated in the present Example (refer FIG. 2), it does not restrict to this. That is, the fan cleaning device 24 may be disposed in the blowoff air passage h3.

Moreover, although the Example demonstrated the structure in which one indoor unit Ui (refer FIG. 1) and one outdoor unit Uo (refer the same figure) were provided, it does not restrict to this. That is, a plurality of indoor units connected in parallel may be provided, and a plurality of outdoor units connected in parallel may be provided.
Further, although the wall-mounted air conditioner 100 has been described in the embodiment, the present invention can be applied to other types of air conditioners.

In addition, each example is described in detail to explain the present invention in an easy-to-understand manner, and is not necessarily limited to one having all the configurations described. In addition, with respect to a part of the configuration of each embodiment, it is possible to add, delete, and replace other configurations.
Further, the mechanisms and configurations described above indicate what is considered to be necessary for the description, and not all the mechanisms and configurations of the product are necessarily shown.

12 outdoor air heat exchanger 16 indoor fan 24b fan cleaning unit 31b1 rotational speed control unit 50 fan blade 50a outer end 50c uneven shape 50d tip edge surface 50e concave portion 50f convex portion 50g corner portion 50i dimple 50j side 100 air Conditioner b Rotational direction a Longitudinal direction of fan blade c Bottom edge θ Sharp angle

Claims

Indoor heat exchanger,
With indoor fan,
And a fan cleaning unit for cleaning the indoor fan,
The air conditioner according to claim 1, wherein an outer end portion of the fan blade of the indoor fan in contact with the fan cleaning portion has a concavo-convex shape with a concavo-convex portion formed continuously in a longitudinal direction.
The air conditioner according to claim 1, wherein the uneven shape includes a portion having a larger curvature in a convex portion than in a portion where the tip edge surface is concave.
The air conditioner according to claim 2, wherein in the uneven shape, corner portions are formed in the convex portion, and a curvature of the corner portions is larger than that of the concave portion.
The air conditioner according to claim 2 or 3, wherein the concave and convex shape has a substantially arc shape in the concave portion.
The air conditioner according to claim 1, wherein the surface roughness of the outer end portion is rougher than the surface roughness of the other portion of the fan blade.
The air conditioner according to claim 5, wherein a dimple is formed on the surface of the outer end, so that the surface roughness is rougher than the surface roughness in the other portion of the fan blade.
The air according to claim 1, wherein the fan blades of the indoor fan are adjacent to each other one or more in the rotational direction, and the uneven shape is deviated in the longitudinal direction of the fan blade when viewed in the rotational direction. Harmonizer.
The air conditioner according to claim 1, wherein the uneven shape has an acute or obtuse angle with the longitudinal direction of the fan blade in the surface direction of the tip edge surface at the side of the convex portion.
The air conditioner according to claim 1, wherein the fan cleaning portion has an end that reaches the lower end of the concave portion in the uneven shape.
The air conditioner according to claim 1, wherein the fan cleaning unit is supported movably by a predetermined distance in a longitudinal direction of the indoor fan.
The air conditioner according to claim 1, wherein a rotational speed of the indoor fan at the time of cleaning of the indoor fan by the fan cleaning unit is higher than a minimum rotational speed at the time of air conditioning operation.