JP7691641B2 - Air conditioner indoor unit - Google Patents

Description

The present invention relates to an indoor unit of an air conditioner, and more specifically, to the arrangement of electrical wiring (hereinafter also referred to as electrical cords) for electrical components of the indoor unit (e.g., a drain pump, a float switch, etc.).

For example, a ceiling-embedded duct type air conditioner has an indoor unit housing that is suspended in the space above the ceiling by hanging bolts or the like. Because the space above the ceiling may be narrow in the vertical direction, for example, the indoor unit housing is formed as a flat rectangular parallelepiped. The interior of the indoor unit housing is partitioned by a partition plate. The partition plate divides the interior of the indoor unit housing into a heat exchange chamber that houses the heat exchanger and a blower chamber that houses the blower. The blower chamber is provided with, for example, an electrical equipment box. The electrical equipment box houses, for example, a control board that controls electrical components such as the drain pump and float switch of the indoor unit, and a power terminal block to which an external power source is connected to supply power to each component.

The indoor unit housing has, for example, a top panel, a bottom panel, a left side panel, and a right side panel, and the front and rear or part of the bottom panel are open as air circulation ports, and an air intake port to which an air intake duct is connected is provided on part of the rear or bottom panel on the blower room side, and an air outlet port to which an air exhaust duct is connected is provided on the front side on the heat exchange room side.

At the bottom of the heat exchange chamber is a drain pan that collects condensed water generated during cooling operation. In addition, the heat exchange chamber is equipped with a drain pump to drain the condensed water accumulated in the drain pan and a float switch to detect the condensed water level.

For example, as described in Patent Documents 1 and 2, an opening for maintenance is formed in the side panel of the heat exchange chamber, and the drain pump and float switch are attached to the back side of a removable cover plate that covers the opening so that they can be easily removed from inside the heat exchange chamber during maintenance.

The drain pump and float switch are connected to the control board inside the electrical equipment box via an electrical cord that transmits power and control signals. The electrical equipment box contains heat-generating components, so it is placed inside the well-ventilated blower room.

In the invention described in Patent Document 1, therefore, a wiring insertion hole is provided in the partition plate, and the electrical cords of the drain pump and float switch are passed through the wiring insertion hole and led to the blower compartment side, and are connected to the control board etc. inside the electrical equipment box from the back side of the electrical equipment box.

As a result, when performing maintenance such as replacing the drain pump and float switch, it is necessary to reach inside the indoor unit housing to perform the work, which makes it difficult to see and work on the wiring, and results in time-consuming maintenance work.

In contrast, in the invention described in Patent Document 2, the electrical cords for the drain pump and float switch are wired along the outside (outer surface) of the side panel of the indoor unit housing, rather than passing through it, and are connected to the control board in the electrical equipment box. This makes the wiring easy to see, and eliminates the need to reach inside the indoor unit housing to work.

In the invention described in Patent Document 2, the outer wiring section that runs the electrical cord along the outside of the side panel is covered with a wiring cover after maintenance is completed, which holds the electrical cord to the outer wiring section. However, a problem with this is that the electrical cord needs to be tied up with a tie or similar device and held in the outer wiring section during maintenance work to prevent it from becoming dislodged.

The wiring cover portion covers the outer wiring portion from the outside, and is therefore formed in a convex trapezoidal shape that bulges outward. This can cause a portion of the side panel of the indoor unit housing to become convex due to the wiring cover portion, which may, for example, interfere with connecting the refrigerant piping that is routed from the outdoor unit to the indoor unit housing.

The wiring cover is formed in a trapezoidal shape that bulges outward and spans the adjacent parts of the electrical equipment box lid and the piping lid, but this requires machining using sheet metal, which is costly, among other problems.

International Publication WO 2013/129527 JP 2016-223666 A

The objective of the present invention is therefore to facilitate maintenance work in an indoor unit of an air conditioner in which the interior of the indoor unit housing is divided into a heat exchange chamber and a blower chamber by a partition plate.

In order to solve the above problems, the present invention provides an indoor unit for an air conditioner, comprising an indoor unit casing the interior of which is partitioned by a partition plate into a heat exchange chamber having a heat exchanger and a blower chamber having a blower, a first opening which opens toward the heat exchange chamber and a second opening which opens toward the blower chamber are formed on a side surface of the indoor unit casing, an electrical equipment unit is arranged within the blower chamber along the second opening, and the electrical equipment unit is connected by electrical wiring to electrical components arranged within the heat exchange chamber,
The side surface is characterized in that a recess that is recessed toward the inside of the indoor unit housing is formed between the first opening and the second opening.

According to the present invention, maintenance work can be easily performed on an indoor unit of an air conditioner in which the interior of the indoor unit housing is divided into a heat exchange chamber and a blower chamber by a partition plate.

1 is a cross-sectional view showing a ceiling-embedded duct type air conditioner of the present invention installed in a house. 1 is an external perspective view of a ceiling embedded duct type air conditioner of the present invention; Cross-sectional view of line AA in Figure 2. FIG. 3 is a left side view including a left side panel of the indoor unit housing in FIG. 2 . FIG. 5 is a left side view of the indoor unit housing similar to FIG. 4 , showing a state in which a first opening for heat exchange chamber maintenance is open. FIG. 13 is a perspective view showing a state in which a drain pump and a float switch are attached to the back side of the cover plate of the first opening for maintenance of the heat exchange chamber. FIG. FIG. 4 is a perspective view showing an electrical component box arranged in a blower chamber of the indoor unit housing with the box open; FIG. 4 is a perspective view showing a condensed water storage portion of a drain pan arranged in the heat exchange chamber. 11 is a perspective view showing a state in which a dust collecting section is disposed in a condensed water storage section of a drain pan. FIG. 13 is a perspective view showing a state in which the dust collecting section is attached to and detached from the condensed water storage section. FIG. FIG. 4 is a perspective view showing the inside of the indoor unit housing with the top panel removed. 13 is a cross-sectional view taken along line BB in FIG. 12 . 14 is a cross-sectional view taken along line CC in FIG. 13 . FIG. 4 is an exploded perspective view showing a fixing means (fixing tool) of the heat exchanger. FIG. 4 is a diagram showing a maintenance operation for the indoor unit housing.

Next, several embodiments included in the present invention will be described with reference to Figures 1 to 16, but the present invention is not limited to these.

First, referring to Figures 1 to 4, the ceiling-embedded duct type air conditioner of the present invention has an indoor unit housing 10 that is installed in the attic 9 of a house. Because the space in the attic 9 is narrow in the vertical direction, the indoor unit housing 10 has a flattened rectangular parallelepiped shape. Hanging hooks 101 are provided at the four corners of the indoor unit housing 10 for hanging the indoor unit housing 10, for example, from a structural slab 91 by hanging bolts 101a.

The indoor unit housing 10 comprises a top panel 11, a bottom panel 12, a left side panel (the side panel on the left in FIG. 2) 13L, and a right side panel (the side panel on the right in FIG. 2) 13R. The front surface (the left side in FIG. 2) 14 and the rear surface (the right side in FIG. 2) 15 of the indoor unit housing 10 are open as air circulation ports. When there is no need to distinguish between the left side panel 13L and the right side panel 13R, they are collectively referred to as the side panel 13.

As shown in FIG. 3, the interior of the indoor unit housing 10 is divided into left and right halves by a partition plate 16, with the heat exchange chamber 20 allocated to the front surface 14 side and the blower chamber 30 allocated to the rear surface 15 side. Referring to FIG. 12, the left side panel 13L and the right side panel 13R are fixed to the left end 16L and the right end 16R of the partition plate 16, respectively.

A heat exchanger 21 and a drain pan 22 are provided in the heat exchange chamber 20. A blower 31 is provided in the blower chamber 30. A sirocco fan is used as the blower 31. In this embodiment, as shown in FIG. 12, the number of blowers 31 is two, but it may be one or three or more.

In this embodiment, when the blower 31 is operated, indoor air is sucked in from the rear surface 15 of the indoor unit housing 10, and the conditioned air that has been heat exchanged in the heat exchanger 21 is blown out from the front surface 14 of the indoor unit housing 10.

Therefore, the rear surface 15 of the indoor unit housing 10 is the air intake port 151 to which the air intake duct 80 is connected, and the front surface 14 of the indoor unit housing 10 is the air outlet port 141 to which the air outlet duct 81 is connected. As shown in FIG. 2, the air intake port 151 is provided with an intake grille 152 having an air filter.

Referring to Figures 5 and 6 together, the left side panel 13L has a first opening 40 that opens toward the heat exchange chamber 20 and a second opening 50 that opens toward the blower chamber 30, which are arranged side by side at a predetermined distance apart for maintenance purposes.

A first cover plate 41 is removably attached to the first opening 40, and a second cover plate 51 is removably attached to the second opening 50. Both the first cover plate 41 and the second cover plate 51 are made of metal plates, and are screwed to the periphery of the corresponding openings 40, 50 as shown in FIG. 4.

As shown in FIG. 7, a drain pump 42 for draining condensed water accumulated in the drain pan 22 and a float switch 43 for detecting the water level of the condensed water accumulated in the drain pan 22 are attached to the back surface of the first cover plate 41. By removing the first cover plate 41, the drain pump 42 and the float switch 43 can be taken out from inside the heat exchange chamber 20.

An electrical cord 44P is pulled out from the drain pump 42, and an electrical cord 44F is pulled out from the float switch 43. These electrical cords 44P and 44F are sometimes collectively referred to as electrical cord 44.

Electrical cord 44P and electrical cord 44F each appear to be a single cord, but in this embodiment, electrical cord 44P of drain pump 42 is an electrical cord with two lead wires with an outer diameter of 0.8 mm inserted into a protective tube with an inner diameter of 5 mm and a thickness of 0.5 mm. Electrical cord 44F of float switch 43 is an electrical cord with two lead wires with an outer diameter of 0.5 mm inserted into a protective tube with an inner diameter of 5 mm and a thickness of 0.5 mm.

An electrical equipment unit 52 is arranged along the second opening 50 in the blower chamber 30. Referring to FIG. 8, the electrical equipment unit 52 in this embodiment is composed of an electrical equipment box 521, and a control board 522, a terminal block 523, and the like housed in the electrical equipment box 521. The electrical equipment box 521 is box-shaped with one side open, and is closed by a second cover plate 51. Heat-generating components are mounted inside the electrical equipment box 521, and therefore it is arranged in the well-ventilated blower chamber 30.

The electrical cords (electrical wiring) 44 (44P, 44F) drawn from the drain pump 42 and the float switch 43 are routed from the heat exchange chamber 20 side to the blower chamber 30 side and connected to a predetermined terminal of the electrical equipment unit 52. In this embodiment, the electrical cords 44 can be led into the electrical equipment box 521 without protruding the left side panel 13L.

Therefore, in the left side panel 13L, a recess 131 is formed in the intermediate wall 130 between the first opening 40 and the second opening 50, which recesses toward the inside of the indoor unit housing 10. The recess 131 has a groove-like shape (hereinafter also referred to as a groove shape) that connects the first opening 40 and the second opening 50. The electric cord 44 drawn from the drain pump 42 and the float switch 43 is arranged in the recess 131 so as to fit within the recess 131 (hereinafter also referred to as a wiring passage portion).

In this embodiment, the first opening 40 has a first recess 401 (see FIG. 11) in which a portion of the edge forming the opening is recessed toward the inside of the indoor unit housing 10. The first recess 401 is connected to one end of the groove-shaped recess.

The second opening 50 also has a second recess 501 (see FIG. 5) in which part of the edge forming the opening is recessed toward the inside of the indoor unit housing 10. The second recess 501 is connected to the other end of the groove-shaped recess.

In order to allow the electric cord 44 to fit within the recess (wiring passage) 131, it is preferable that the depth of the recess 131 is greater than the outer diameter of the protective tube for the electric cord 44. In addition, it is preferable that the groove width W (vertical width, see FIG. 6) of the wiring passage 131 is at least twice the outer diameter of the protective tube so that at least two electric cords 44P, 44F can be wired side by side.

This recess (wire passage) 131 allows the electrical cord 44 to be easily seen during maintenance of the drain pump 42 and float switch 43, preventing, for example, confusion or misidentification of the electrical cord 44P of the drain pump 42 and the electrical cord 44F of the float switch 43. It also eliminates the need to reach inside the indoor unit housing 10 to perform the work.

In addition, since the electrical cord 44 can be laid along the inside of the recess (wiring passage) 131, there is no need to tie the electrical cord 44 with a tie or the like to prevent it from becoming dislodged during maintenance work.

Except during maintenance, the recess (wire passage) 131 is covered by a wiring cover. In this embodiment, as shown in FIG. 3, the recess (wire passage) 131 is covered by approximately half each of the wiring cover part 411 formed on the right end of the first cover plate 41 and the wiring cover part 511 formed on the left end of the second cover plate 51, but either the wiring cover part 411 or the wiring cover part 511 may be made larger to cover the other part to cover the wiring passage 131.

In any case, since a groove-shaped wiring passage portion 131 is formed in the side panel 13, the wiring cover can be made flat while the electrical cord can be placed inside the wiring passage portion 131. Therefore, the first cover plate 41 including its wiring cover portion 411 can be made by punching out of a flat metal plate, and similarly, the second cover plate 51 including its wiring cover portion 511 can be made by punching out of a flat metal plate, so there is no need for sheet metal processing to create irregularities or the like on the first cover plate 41 and the second cover plate 51.

When storing the electric cord 44 in the recess (wire passage) 131, it is preferable to attach an elastic body 135 to the electric cord 44 as a cord holder, as shown in Figures 7 and 8. In this case, it is preferable that the elastic body 135 has a volume larger than the volume of the space surrounded by the wiring cover parts 411, 511 and the recess (wire passage) 131. This allows the elastic body 135 to be compressed by the wiring cover parts 411, 511 that cover the recess (wire passage) 131, and the elastic body 135 can hold the electric cord.

In this embodiment, the electric cord 44 is inserted into the elastic body 135, but to eliminate the need to insert the electric cord 44, the elastic body 135 may be provided on either the wiring passage portion 131 side or the wiring cover portion 411, 511 side, or on both sides, so as to clamp the electric cord 44.

Although not shown, the heat exchanger 21 is provided with a thermistor as a temperature detection element. The electrical cord of this thermistor may be connected to the control board in the electrical component box 521 via the wiring passage 131 together with the electrical cord 44. For example, the electrical cord of the thermistor may be an electrical cord in which one lead wire with an outer diameter of 1.3 mm is inserted into a protective tube with an inner diameter of 3.5 mm.

Next, as shown in FIG. 9, the drain pan 22 has a condensed water storage section 221 on the water receiving surface (upper surface) side that receives the condensed water dripping from the heat exchanger 21, where the condensed water is collected by an inclined surface. A drain pump 42 and a float switch 43 are arranged in the condensed water storage section 221, and when the water level of the condensed water reaches a certain level or higher, the float switch 43 detects this and the drain pump 42 is activated to drain the condensed water.

As described above, the drain pump 42 and float switch 43 are provided on the back side of the first cover plate 41, and by attaching the first cover plate 41 to the first opening 40, the drain pump 42 and float switch 43 are positioned in the condensed water storage section 221.

In addition, the condensed water storage section 221 is provided with a drain outlet 222 for draining the condensed water separately from the drain pump 42. This drain outlet 222 is closed by a plug (not shown) except when condensed water is drained from the condensed water storage section 221 during maintenance work, for example.

Condensed water is stored in the condensed water storage section 221. This condensed water storage section 221 may contain dust deposits (hereinafter also referred to as garbage (dust)) that have grown due to the accumulation of fine dust particles contained in the circulated indoor air. Dust deposits are formed, for example, by the accumulation of dust attached to the heat exchanger 21 or the drain pan 22. This garbage flows down the inclined surface together with the condensed water and causes the vicinity of the condensed water storage section 221 to become dirty, so the vicinity of the condensed water storage section 221 is cleaned regularly or irregularly. To remove the dirt near the condensed water storage section 221, it is necessary to remove the drain pan 22 from the bottom of the heat exchange chamber 20, but it is not easy to remove the drain pan 22 from the bottom of the heat exchange chamber 20.

The indoor unit housing 10 according to this embodiment is therefore equipped with a dust collection section 60 arranged in the condensed water storage section 221 of the drain pan 22, as shown in Figures 10 and 11. The dust collection section 60 collects dust that flows down the inclined surface together with the condensed water. The dust collection section 60 can be inserted and removed from the heat exchange chamber 20 via the first opening 40. Dust collected by the dust collection section 60 when pulled out from the first opening 40 can be easily removed. This makes it easier to clean the condensed water storage section 221, where dirt tends to accumulate.

The dust collection unit 60 is formed, for example, in a box shape. The dust collection unit 60 includes a back frame 610, a left side frame 620 connected to the left side 611 of the back frame 610 at a substantially right angle in FIG. 10, a right side frame 630 connected to the right side 612 of the back frame 610 at a substantially right angle so as to face the same direction as the left side frame 620 in FIG. 10, and a bottom frame 640. The bottom frame 640 is provided diagonally from the top side 613 of the back frame 610 to between the lower corners 621, 631 of the left side frame 620 and the right side frame 630 (the lower corners on the opposite side of the back frame 610).

Each of the back frame 610, left frame 620, right frame 630, and insole frame 640 is covered with a fine mesh that can capture dirt contained in the condensed water. This mesh is preferably made of metal or resin, but filters such as porous metal plates or porous resin sheets may also be used.

The dust collection unit 60 is arranged in the condensed water storage unit 221 with the mid-bottom frame 640 facing the direction in which the condensed water flows. The drain pump 42 and float switch 43 are arranged downstream of the dust collection unit 60, for example, the back frame 610 or the left side frame 620.

As an alternative, the midsole frame 640 may be positioned flat along the bottom surface of the dust collection section 60 rather than at an angle, and the drain pump 42 and float switch 43 may be positioned inside the dust collection section 60.

In any case, the dust collector 60 can collect dust contained in the condensed water, and since the dust collector 60 can be inserted and removed through the first opening 40, the drain pan 22, which was previously considered difficult to clean, can be easily cleaned and kept clean. It can also prevent clogging of the drain pump 42.

Next, the fixing device 70 as a fixing means for the heat exchanger 21 will be described with reference to Figures 12 to 15.

The heat exchanger 21 is a fin tube type, and is housed in the heat exchange chamber 20 at an angle to increase the heat exchange area with the air. In this embodiment, the heat exchanger 21 is arranged at an angle so that it slopes upward from the partition plate 16 side toward the air outlet 141 side on the front surface 14 of the indoor unit housing 10.

In this case, the lower end of the heat exchanger 21 is placed in close contact with the drain pan 22, and the upper end of the heat exchanger 21 is placed in close contact with the insulating material 201 provided around the air outlet 141, so that no air does not pass through the heat exchanger 21. However, if excessive vibrations are applied during transportation of the product, including transportation within a factory, the heat exchanger 21 may bend or distort, creating a gap at least at one of the upper and lower ends of the heat exchanger 21, which may result in an air flow that does not exchange heat passing through the gap.

The indoor unit housing 10 according to this embodiment is therefore provided with a fixing device 70 that holds down a portion of the heat exchanger 21 on the partition plate 16 side from above as a fixing means for the heat exchanger 21 on the partition plate 16 side.

As shown in FIG. 15, the fixture 70 comprises a gate-shaped frame 71 made of metal including a pair of left and right leg plates 711, 711 and a connecting plate 713 that is hung between each end of the leg plates 711, 711, and a buffer material 72 attached to the connecting plate 713.

The cushioning material 72 is preferably made of a synthetic resin material such as FPE (formed polyethylene). It is also preferable that the cushioning material 72 is attached to the center of the connecting plate 713 along the length of the connecting plate 713 with a length shorter than the length of the connecting plate 713 so as to minimize ventilation resistance. The cushioning material 72 can be attached to the connecting plate 713 by, for example, using an adhesive or by injection molding the connecting plate 713 in a mold. In this embodiment, the cushioning material 72 is formed in a rectangular column shape, but it may also be cylindrical.

At the other end of the leg plates 711, 711, screw fastening pieces 712, 712 are formed that are bent at right angles away from each other as a means of attachment to the partition plate 16.

The preferred mounting position of the fixture 70 on the partition plate 16 will now be described. As multiple fans (sirocco fans) 31 are installed in the blower chamber 30, two in this embodiment, two air outlets 161, 161 are formed in the partition plate 16 corresponding to each fan 31. The fixture 70 is preferably positioned between the air outlets 161, 161 to reduce the ventilation resistance to the airflow blown out from the air outlets 161, 161.

The fixing device 70 is screwed to the partition plate 16 by abutting the corners of the cushioning material 72 against the upper surface of the heat exchanger 21 facing the top panel 11 and pressing the heat exchanger 21 from above so that the lower end side of the heat exchanger 21 is in close contact with the drain pan 22. This makes it possible to prevent gaps from occurring between the lower end of the heat exchanger 21 and the drain pan 22, and between the upper end of the heat exchanger 21 and the insulating material 201, even if the heat exchanger 21 is subjected to vibration or impact.

This eliminates the leakage of airflow that is not subject to heat exchange, and also prevents dew splashing and performance degradation due to path imbalance.

Maintenance of the electrical equipment unit 52 is often performed in a dark space, such as above the ceiling, and in such cases, lighting is required. Flashlights are generally used, but the position of the flashlight needs to be adjusted every time the work location changes, and because the work space is small, it is often difficult to place the flashlight in an appropriate position, which makes maintenance difficult.

In this embodiment, as shown in FIG. 8, lighting means 82 is provided to illuminate the electrical equipment unit 52, and switch means 83 is provided in the electrical equipment box 521 to detect the opening and closing of the second cover plate 51 of the electrical equipment box 521 and turn on and off the power supply to the lighting means 82, so that the lighting means 82 is turned on when the second cover plate 51 is open. The second cover plate 51 also serves as the cover plate for the second opening 50.

An LED (light emitting diode) may be used for the lighting means 82. In this embodiment, a spherical LED is used as the light emitting section, and in FIG. 8, the part indicated by the solid line shows the visible part, and the part indicated by the dotted line shows the part hidden by the side panel 13. A microswitch is preferably used for the switch means 83. The actuator of the microswitch is switched between the on and off positions by the second cover plate 51.

For example, when the second cover plate 51 is attached to the second opening 50, the actuator is pressed by the second cover plate 51 to switch it off and turn off the power to the LED, and when the second cover plate 51 is removed, the actuator returns to the switch-on position and turns on the power to the LED. Figure 16 shows an image of maintenance work being performed with the interior of the electrical equipment box 521 brightly lit by the lighting means 82.

In place of the microswitch, a reed switch, photoelectric switch, or pyroelectric sensor can also be used. In addition, as a preferred embodiment, a secondary battery is used as the power source for the lighting means 82, and is charged while the air conditioner is in operation, so that the lighting can be used even when the power to the air conditioner itself is turned off during maintenance.

Furthermore, the lighting means 82 may be provided not only in the electrical equipment box 521, but also in at least one of the heat exchange chamber 20 and the blower chamber 30, and such an embodiment is also included in the present invention. That is, the lighting means 82 and the switch means 83 are applied to an embodiment in which a maintenance opening is provided in the heat exchange chamber 20 and the blower chamber 30, and an opening/closing cover similar to the second cover plate 51 is attached to the opening. In this case, the switch means 83 is a switch that does not require an actuator and is turned on and off by opening and closing the opening/closing cover. In addition, although the indoor unit housing 10 in this embodiment is a ceiling-embedded duct type, the lighting means 82 and the switch means 83 may also be applied to a ceiling-embedded electrical equipment box.

The present invention has been described above using an embodiment, but the technical scope of the present invention is not limited to the description of the above embodiment. Modifications or improvements made to the above embodiment by those skilled in the art are also included in the technical scope of the present invention.

REFERENCE SIGNS LIST 10 Indoor unit housing 11 Top panel 12 Bottom panel 13 Side panel 130 Intermediate wall 131 Wire passage 135 Elastic body 14 Front surface 141 Air outlet 15 Rear surface 151 Air intake 152 Intake grille 16 Partition plate 161 Air outlet 20 Heat exchange chamber 201 Insulation material 21 Heat exchanger 22 Drain pan 221 Condensate storage section 222 Drain outlet 30 Fan chamber 31 Fan (sirocco fan)
40 First opening 41 First cover plate 411 Wiring cover section 42 Drain pump 43 Float switch 44 (44P, 44F) Electric cord 50 Second opening 51 Second cover plate 511 Wiring cover section 52 Electrical component unit 521 Electrical component box 522 Control board 523 Terminal block 60 Dust collection section 610 Back frame 620 Left side frame 630 Right side frame 640 Inner bottom frame 70 Fixing means (fixing tool)
71 Gate-shaped frame 711 Leg plate 712 Screw-fastening piece 72 Cushioning material 82 Lighting means 83 Switch means

Claims (8)

An indoor unit for an air conditioner comprising an indoor unit casing the interior of which is partitioned by a partition into a heat exchange chamber having a heat exchanger and a blower chamber having a blower, a first opening opening toward the heat exchange chamber and a second opening opening toward the blower chamber are formed on a side surface of the indoor unit casing, an electrical equipment unit is disposed within the blower chamber along the second opening, and the electrical equipment unit is connected by electrical wiring to electrical components disposed within the heat exchange chamber;
an air conditioner indoor unit, wherein a recess that is recessed toward an inside of the indoor unit casing is formed on the side surface between the first opening and the second opening. The indoor unit of an air conditioner according to claim 1, characterized in that the electrical wiring extending from the heat exchange chamber to the electrical equipment unit is arranged in the recess. The indoor unit of the air conditioner according to claim 1 or 2, characterized in that the recess is a groove-shaped recess formed to connect the first opening and the second opening. The indoor unit of an air conditioner according to claim 3, characterized in that the first opening includes a first recess in which a part of the edge forming the opening is recessed toward the inside of the indoor unit housing, and the first recess is connected to one end of the groove-shaped recess. The indoor unit of an air conditioner according to claim 3 or 4, characterized in that the second opening includes a second recess in which a part of the edge forming the opening is recessed toward the inside of the indoor unit housing, and the second recess is connected to the other end of the groove-shaped recess. The indoor unit of an air conditioner according to any one of claims 1 to 5, characterized in that it has a first cover plate that is removably attached to the first opening and a second cover plate that is removably attached to the second opening, and at least one of the first cover plate and the second cover plate has a cover portion that covers the recess. The indoor unit of the air conditioner according to claim 6, characterized in that at least one of the cover part covering the recess and the recess is provided with an elastic body that holds down the electrical wiring. The indoor unit of an air conditioner according to claim 6, characterized in that a drain pan is disposed at the bottom of the heat exchange chamber, and a drain pump for draining condensed water accumulated in the drain pan and a float switch for detecting the water level of the condensed water are attached to the back surface of the first cover plate as the electrical components, and the electrical wiring passing through the recess is at least the electrical wiring for the drain pump and the electrical wiring for the float switch.

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