JP6375915B2 - Air conditioner indoor unit - Google Patents

Description

  The present invention relates to an indoor unit of an air conditioner including an electrical component box.

  An air conditioner is equipped with an electrical component box for air conditioning control in its indoor unit, but a printed circuit board mounted on the electrical component box incorporates many electrical components that can be a fire type. For this reason, when using a flammable refrigerant for the refrigeration cycle, when the refrigerant leaks from the pipe and enters the electrical component box, a fire may be caused if the concentration of the refrigerant exceeds a predetermined value.

  In order to prevent the occurrence of such a fire, the electrical component box may have a sealed structure so that the refrigerant does not enter the electrical component box.

  Therefore, conventionally, as described in Patent Document 1, an air flow passage that leads from the electrical component box to the outside is formed in the indoor unit, and when refrigerant enters the electrical component box, the air flow passage passes through the air flow passage. Thus, the concentration of the refrigerant remaining in the electrical component box is reduced to a predetermined value or less so that the refrigerant can be released to the outside.

Japanese Patent Laid-Open No. 11-094291

  However, in the configuration of Patent Document 1, it is necessary to form a special air flow passage, and it is desired that the amount of refrigerant entering the electrical component box can be regulated without such an air flow passage. . By the way, in order to insert wiring such as motor wiring into the electrical component box, a wiring insertion portion is formed in the electrical component box. When the type and thickness of the wiring to be inserted into the electrical component box differs for each indoor unit model, it is necessary to form the wiring insertion part of the electrical component box for each type and thickness of the wiring. In order to be able to use the wiring insertion part regardless of the type of wiring, for example, the wiring insertion part may be formed in accordance with the wire diameter of the maximum diameter wiring. However, since the size of the wire insertion portion is fixed, when a small-diameter wire is inserted into the wire insertion portion, the large-diameter wire and the wire insertion portion are not inserted in the gap between the small-diameter wire and the wire insertion portion. There is a possibility that a gap larger than the gap between the parts is formed, and the refrigerant enters the electrical component box from the large gap, and the concentration of the refrigerant in the electrical component box may reach the ignition concentration. Therefore, it is necessary to provide a separate refrigerant intrusion prevention structure so that the refrigerant does not enter the electrical component box from this large gap.

  The object of the present invention is to allow the wiring to be inserted into the wiring insertion portion of the electrical component box regardless of the diameter of each of the large-diameter wiring and the small-diameter wiring. To provide an indoor unit for an air conditioner that can regulate the amount of refrigerant entering the electrical component box without providing a prevention structure.

In order to achieve the above object, the present invention provides an indoor unit of an air conditioner including an electrical component box and a printed circuit board mounted on the electrical component box, wherein the electrical component box is mounted with the printed circuit board. An electrical component box body having a bottom plate and a peripheral wall plate surrounding the periphery of the bottom plate, an electrical component box lid for closing an open side of the space surrounded by the peripheral wall plate of the electrical component box body, and an inner peripheral side of the peripheral wall plate An inner wall plate that is mounted on the peripheral wall plate, and the peripheral wall plate and the inner wall plate are connected to the printed circuit board, and the wire diameter is a small diameter or less than the wire diameter of the small diameter wire. Provided with a wire insertion portion for inserting any one of the wires having a large wire diameter on the distal end side, and the wiring insertion portion extends from the end portion on the open side of the peripheral wall plate to the printed circuit board. Is formed by cutting out toward the wire diameter of the large-diameter wiring. An outer slit formed in a corresponding width, and a width corresponding to the wire diameter of the small-diameter wiring formed by cutting out from the open end of the inner wall plate toward the printed circuit board so as to connect to the outer slit An inner slit formed in the outer slit, and the large-diameter wiring for inserting the electric wire into the inner slit, or the small-diameter wiring to be inserted into the outer slit and the inner slit, Surrounding the outer slit and the inner slit with the electrical component box lid attached to the electrical component box body, the gap between the outer slit, the electrical component box lid and the large-diameter wiring, and the inner slit and the The effective diameter of the gap between the electrical component box lid and the small-diameter wiring is set to be 3 mm or less .
Further, according to the present invention, the inner wall plate is disposed on the inner peripheral side of the peripheral wall plate at a distance from the peripheral wall plate instead of being mounted on the inner peripheral side of the peripheral wall plate. A space between the inner wall plates is formed in a box shape by a bottom portion and side wall portions surrounding both sides of the bottom portion.
Further, in the present invention, the electrical component box is surrounded by an electrical component box body having a bottom plate on which the printed board is mounted and a peripheral wall plate surrounding the periphery of the bottom plate, and the peripheral wall plate of the electrical component box body. An electrical component box lid that closes the open side of the space, and an outer peripheral plate that is mounted on the outer peripheral side of the peripheral wall plate so as to overlap the peripheral wall plate. The peripheral wall plate and the outer peripheral plate are connected to the printed circuit board. A wire insertion part for inserting one of the wires having a small diameter, or a wire having a large diameter on the tip side with a wire having a diameter equal to or smaller than that of the small diameter wire, The wiring insertion part is formed by cutting out from the open end of the outer peripheral plate toward the printed circuit board and formed in a width corresponding to the wire diameter of the large-diameter wiring, and the outer slit. From the end on the open side of the peripheral wall plate to connect Wherein the formed notching toward the PC board includes an inner slit formed in a width corresponding to the wire diameter of the small-diameter wires.

  According to the present invention, a wire having a large wire diameter or a wire having a small wire diameter can be inserted into the wiring insertion portion of the electrical component box, and a special refrigerant intrusion prevention structure can be formed by using the wiring insertion portion. Even if it is not provided, the amount of the refrigerant entering the electrical component box can be regulated.

It is a perspective view of the right side part of the indoor unit of the air conditioner of one Example of this invention. It is a disassembled perspective view of the electrical component box integrated inside the front panel of the right part of the indoor unit. It is a perspective view of the state which removed the electrical component box cover, the display / reception case, and the human detection sensor from the electrical component box. It is a perspective view which shows the combination of the electrical component box main body and the electrical component box cover which removed the display / reception case and the human detection sensor. It is a left view of an electrical component box. It is sectional drawing of the AA line of FIG. It is a top view of the state which inserted wiring in the insertion part. It is a side view of the state where wiring was inserted in the insertion part. It is sectional drawing of the insertion part of another Example.

  FIG. 1 shows a right side portion of an indoor unit of an air conditioner according to one embodiment of the present invention. 40 is a front panel that covers the outside of the components such as the heat exchanger and the electrical component box 10 to be described later, and is located on the right side of the center portion where the heat exchanger opening 41, the wind direction plate 42, the diffuser 43, etc. are provided. A region 44 for storing the electrical component box 10 is provided. 45 is a detachable maintenance cover for maintenance of the electrical component box 10 housed in the area 44, 46 is a display / reception unit in which a display / reception case 20 described later is disposed, and 47 is a person described later on the inner side. It is a human detection sensor decorative frame in which the detection sensor 30 is arranged.

  FIG. 2 shows a state where the electrical component box 10 is disassembled. The electrical component box 10 includes an electrical component box main body 11, an electrical component box lid 12, and a power cable attachment portion 13 integrated with the electrical component box main body 11. The electrical component box body 11, the electrical component box lid 12, and the power cable mounting portion 13 are made of resin. Among them, the electrical component box body 11 and the electrical component box lid 12 of the electrical component box 10 are heat resistant on the outer surface. And the sheet metal B (refer FIG. 6) for electromagnetic shielding is attached. The display / reception case 20 is attached to the power cable attaching portion 13, and the human detection sensor 30 is attached to the display / reception case 20.

  In the power cable attachment portion 13, by pressing a power cable (not shown) inserted from the lower side and drawn upward from the outlet 13a with the band 13b, the tip of the cable is connected to the terminal block 13c. A power cable is attached. The display / reception case 20 is attached by engaging the hook 13d of the power cable attachment portion 13 and the elastic piece 13e (see FIGS. 3, 4, and 5). The display / reception case 20 includes an LED group for displaying on / off of a power source, a current operation state, and the like, and a receiver for receiving a remote control signal (light or radio wave) transmitted by operating a remote controller. The display / reception unit 46 is disposed on the back surface of the front panel 40. The human detection sensor 30 is a sensor that detects whether or not there is a person in the vicinity of the indoor unit, and is arranged on the back side of the human detection sensor decoration frame 46. Note that the power cable attachment portion 13, the display / reception case 20, the human detection sensor 30, and the like are not related to the present invention, and thus detailed description thereof is omitted.

  The electrical component box body 11 is provided with a bottom plate 11f on which the first printed board PWB1 and the second printed board PWB2 are mounted, and a peripheral wall plate 11a surrounding the bottom plate 11f. The inner wall is formed in a bottomed box shape from the left wall plate 11a1 of the peripheral wall plate 11a toward the inside of the electrical component box 10, and is disposed on the inner peripheral side of the left wall plate 11a1 with a space from the left wall plate 11a1. A wiring insertion box 11a12 having a plate 11a13 is provided (FIGS. 6 and 7). The wiring insertion box 11a12 is formed in a bottomed box shape by a bottom part 11a121 and a side wall part 11a122 surrounding both sides of the bottom part 11a121 in a space between the left wall board 11a1 and the inner wall board 11a13 (FIGS. 7 and 8). The left wall plate 11a1 and the inner wall plate 11a13 of the wiring insertion box 11a12 are formed by cutting out from the open end toward the second printed circuit board PWB2, for example, wiring insertion for inserting the motor wiring L Part 11a15 is provided. The motor wiring L inserted through the wiring insertion portion 11a15 is, for example, a wiring L1 having a large diameter having a two-layer structure of a protective tube L11 for insulation and a covered electric wire L12 partially covered by the protective tube L11. Alternatively, any one of the small-diameter wires L2 having only the covered electric wire L21 without the protective tube L11 is used (see FIG. 7). However, it is assumed that the large-diameter wire L1 used has a wire diameter of the covered wire L12 that is equal to or smaller than the wire diameter of the small-diameter wire L2. The above-mentioned wiring insertion part 11a15 is formed in a width H1 and a height F1 corresponding to the wire diameter of the large-diameter wiring L1 (outer diameter of the protective tube L11) by cutting out from the open end of the left wall plate 11a1. The outer slit 11a11 and the width H2 and height F2 corresponding to the wire diameter of the small-diameter wire L2 (outer diameter of the covered wire L21) cut out from the open end of the inner wall plate 11a13 so as to communicate with the outer slit 11a11. The inner slit 11a14 is formed. Due to the structure of the wiring insertion portion 11a15, a gap between an outer slit 11a11 and an electric component box lid 12 to be described later attached to the electric component box body 11 and a large-diameter wire L1, an inner slit 11a14, and an electric component box main body 11 The gap between an electrical component box cover 12 to be mounted and a small-diameter wire L2 is formed to be smaller than a predetermined effective diameter (FIGS. 7 and 8). As will be described later, the predetermined effective diameter is set to a value that does not allow an amount of refrigerant to reach the ignition concentration in the electrical component box 10. In addition, tongue pieces 11a21 and 11a22 for attaching the electrical component box lid 12 are formed on the lower wall plate 11a in the peripheral wall plate 11a.

  In addition, in the interior surrounded by the peripheral wall plate 11a, the mounting region of the first printed circuit board PWB1 is partitioned by the peripheral wall plate 11a, the first vertical wall plate 11b, the first horizontal wall plate 11c, and the second horizontal wall plate 11d. Furthermore, the mounting area of the second printed circuit board PWB2 is partitioned by the wall plate 11a, the first vertical wall plate 11b, the second horizontal wall plate 11d, and the second vertical wall plate 11e. A mica sheet MS is affixed to the wall surface of the first vertical wall plate 11b on the side where the second printed circuit board PWB2 is mounted. This mica sheet MS is for electrically insulating the first printed circuit board PWB1 side and the second printed circuit board PWB2 side.

  The area where the first printed circuit board PWB1 is mounted corresponds to the size of the first printed circuit board PWB1 by the peripheral wall plate 11a, the first vertical wall plate 11b, the first horizontal wall plate 11c, and the second horizontal wall plate 11d. It is divided into areas. Note that the lower end of the first vertical wall plate 11b and the second horizontal wall plate 11d are not in direct contact with each other, and a space SP for wiring insertion and air circulation is formed there.

  A buzzer BZ is mounted on the first printed circuit board PWB1 at the back corner portion close to the inner angle between the first vertical wall plate 11b and the first horizontal wall plate 11c (FIG. 4). This buzzer BZ is sounded when the receiver of the display / reception case 20 of the indoor unit receives an operation signal from the remote controller, and is used for confirmation of the reception.

  The electrical component box lid 12 has a size corresponding to the electrical component box body 11. When this electrical component box lid 12 is mounted on the electrical component box body 11, the open end of the wiring insertion portion 11a15 is closed by the electrical component box lid 12, the open side of the cutout of the outer slit 11a11, and the wiring insertion The open side end of the side wall plate 11a122 of the box 11a12 and the open side of the cutout of the inner slit 11a14 are covered. For this reason, the wiring L of the motor inserted into the wiring insertion part 11a15 is surrounded by the wiring insertion box 11a12 and the electrical component box lid 12. The electrical component box lid 12 is formed with engaging portions 12b and 12c that engage with the tongue pieces 11a21 and 11a22 of the electrical component box body 11.

  Now, when closing the electrical component box body 11 of the electrical component box 10 with the electrical component box lid 12, in the electrical component box body 11, all wiring connections relating to the first printed circuit board PWB1 and the second printed circuit board PWB2 are connected in advance. At this time, the large-diameter wiring L1 or the small-diameter wiring L2 is drawn inward from the outer slit 11a11 toward the inner slit 11a14, and the drawn wiring is electrically connected to the first printed circuit board PWB1 (FIG. 6, FIG. 7). When drawing the large-diameter wiring L1 into the inside, the protective tube L11 is inserted through the outer slit 11a11, and the covered electric wire L12 at the tip side of the protective tube L11 is inserted through the inner slit 11a14 (FIG. 7A). When the small-diameter wiring L2 is pulled inside, the covered electric wire L21 is inserted through the outer slit 11a11 and the inner slit 11a14 (FIG. 7B). The electrical component box lid 12 is aligned so that the engaging portions 12b and 12c engage with the tongues 11a21 and 11a22 of the electrical component box body 11, and then the electrical component box lid 12 is moved to the electrical component box. Cover the main body 11.

  As described above, the wiring insertion portion 11a15 of the peripheral wall plate 11a of the electrical component box body 11 is formed with the width H1 and the height F1 corresponding to the wire diameter of the large-diameter wiring L1 (outer diameter of the protective tube L11). The outer slit 11a11, the wiring insertion box 11a12, and the inner slit 11a14 formed at the height H2 and the width H2 corresponding to the wire diameter of the small-diameter wire L2 (outer diameter of the covered wire L21). Regardless of whether the large-diameter wiring L1 or the small-diameter wiring L2 is used, the large-diameter wiring L1 or the small-diameter wiring L2 from the outer slit 11a11 to the inner slit 11a14 is connected to the inside of the electrical component box 10. (FIGS. 6, 7, and 8). When the large-diameter wiring L1 or the small-diameter wiring L2 is inserted using the outer slit 11a11 and the inner slit 11a14 and the electrical component box body 11 is closed by the electrical component box lid 12, the outer slit 11a11 and the electrical component box lid 12 and the inside slit 11a14, the gap between the electrical component box lid 12 and the small diameter wire L2, and without providing a special refrigerant intrusion prevention structure, It is possible to regulate the amount of refrigerant that enters, so that the refrigerant concentration in the electrical component box 10 does not rise above a predetermined value (FIGS. 6, 7, and 8).

  In this embodiment, the inner wall plate 11a13 is disposed on the inner peripheral side of the left wall plate 11a1 with a space from the left wall plate 11a1, and the wiring insertion box 11a12 is a space between the left wall plate 11a1 and the inner wall plate 11a13. Is formed in a bottomed box shape by the bottom part 11a121 and the side wall part 11a122 surrounding both sides of the bottom part 11a121, so that the outer slit 11a11 and the inner slit 11a14 allow the large-sized wiring L1 and the small-sized wiring L2 to be inside the electrical component box 10. It is possible to guide the pull-in to the.

  Next, a gap that can regulate the amount of refrigerant that enters the electrical component box 10 will be described with reference to FIGS. 7 and 8. The clearance between the wiring insertion portion 11a15 and the large-diameter wiring L1 is determined by the width H1 and the height F1 of the outer slit 11a11 through which the protective tube L11 of the large-diameter wiring L1 is inserted, and the clearance from the protective tube L11 of the large-diameter wiring L1. It becomes a gap S1 with the outer slit 11a11. As the size of the gap S1, for example, when the refrigerant is R32, the effective diameter R is desirably 3 mm or less, and the effective diameter R is obtained by “R = 4 × S / K”. S is the area of the gap S1 in the surface of the outer slit 11a11 among the surfaces of the left wall plate 11a1, and K is the perimeter of the area of the gap S1. For this reason, the gap S1 can be set to the size of the gap where the concentration of the refrigerant entering the electrical component box 10 does not rise above a predetermined value (FIGS. 7A and 8A).

On the other hand, the gap between the wire insertion portion 11a15 and the small-diameter wire L2 is determined by the width H2 and the height F2 of the inner slit 11a14 through which the covered wire L21 of the small-diameter wire L2 is inserted. It becomes a gap S2 with the slit 11a14. As the size of the gap S2, it is desirable to set the effective diameter R to 3 mm or less, and it is obtained by the above-described formula of the effective diameter R. S is the area of the gap S2 in the surface of the inner slit 11a14 among the surfaces of the inner wall plate 11a13, and K is the perimeter of the area of the gap S2. For this reason, the clearance S2 can be set to a size that prevents the concentration of the refrigerant that enters the electrical component box 10 from the wiring insertion box 11a12 from rising above a predetermined value (FIG. 7B and FIG. 8B). )).
In this way, a special refrigerant is used by utilizing the gap S1 between the outer slit 11a11, the electrical component box lid 12 and the large-diameter wire L1, and the gap S2 between the inner slit 11a14, the electrical component box lid 12 and the small-diameter wire L2. Even without providing an intrusion prevention structure, it is possible to regulate the amount of refrigerant that enters the electrical component box 10.

  As described above, even when the refrigerant leaks from the refrigerant pipe, the gap formed between the outer slit 11a11 and the inner slit 11a14, the electrical component box lid 12, and the motor wiring L has a predetermined effective diameter. By making it below, it becomes difficult for the refrigerant to enter the electrical component box 10, the refrigerant concentration in the electrical component box 10 can be regulated to an ignition concentration or less, and explosion prevention of the electrical component box 10 can be realized. Explaining in detail that the gap is not more than a predetermined effective diameter, if the flame generated in the electrical component box 10 in consideration of the properties of the refrigerant is an effective diameter that does not spread to the outside of the electrical component box 10, Even if an electrical component in the electrical component box 10 is ignited, it is possible to prevent the fire spreading to the outside of the electrical component box 10. Therefore, the above-mentioned predetermined effective diameter is compared with the effective diameter for preventing the spread of fire, and the smaller value is set as the predetermined effective diameter, and the outer slit 11a11, the inner slit 11a14, and the electrical component box cover 12 are based on the predetermined effective diameter. If the clearance between the motor wiring L and the motor wiring L is adjusted, it is possible to prevent both the intrusion of the refrigerant into the electrical component box 10 and the spread of the flame to the outside of the electrical component box 10. In addition, the electrical component box 10 can be cooled by the air passing through the gap by using the gap that is equal to or less than the predetermined effective diameter described above, and the electricity mounted on the first printed board PWB1 and the second printed board PWB2 is used. It is also possible to effectively dissipate heat generated by the parts.

  When the electrical component box body 11 is closed by the electrical component box lid 12, the bottom plate 11f of the electrical component box body 11, a part of the peripheral wall plate 11a, the first vertical wall plate 11b, the first horizontal wall plate 11c, and the second horizontal wall. The plate 11d and the electrical component box lid 12 are confined in a resonance chamber RES formed as a space of substantially the same size corresponding to the first printed circuit board PWB1.

  For this reason, when the buzzer BZ mounted in the back corner of the first printed circuit board PWB1 rings, a large reverberant sound is generated as compared with the case where there is no resonance chamber RES surrounding the buzzer BZ.

  From the above, since the sound of the buzzer BZ can be increased, it is possible to reduce the original sound volume actually generated by the buzzer BZ. That is, it is possible to use a buzzer BZ that is smaller than the conventional one, and cost can be reduced.

  The arrangement position of the buzzer BZ is not limited to the inner angle of the first vertical wall plate 11b and the first horizontal wall plate 11c, but a part of the peripheral wall body 11a surrounding the first printed circuit board PWB1, the first vertical wall plate 11b, What is necessary is just to arrange | position in the vicinity of the 1st horizontal wall board 11c, the 2nd horizontal wall board 11d, etc.

  As long as the amount of refrigerant entering the electrical component box 10 can be regulated using the outer slit 11a11 and the inner slit 11a14, the wiring insertion portion 11a15 is not limited to this embodiment, and the wiring having the inner wall plate 11a13 is used. Instead of eliminating the insertion box 11a12, an inner wall plate 11a13 mounted on the left wall plate 11a1 may be provided on the inner peripheral side of the left wall plate 11a1, and cut out from the open end of the left wall plate 11a1. An outer slit 11a11 formed at a width H1 and a height F1 corresponding to the wire diameter of the large-diameter wiring L1, and a small-diameter wiring L2 cut out from the open end of the inner wall plate 11a13 so as to be connected to the outer slit 11a11. An inner slit 11a14 formed in a width H2 and a height F2 corresponding to the wire diameter may be provided (FIG. 9A). Further, the wiring insertion portion 11a15 may include an outer wall plate 11a16 that is mounted on the outer peripheral side of the left wall plate 11a1 so as to overlap the left wall plate 11a1, and is cut out from the open end of the left wall plate 11a1. An inner slit 11a14 formed in a width H2 and a height F2 corresponding to the wire diameter of the small-diameter wiring L2, and a large-diameter wiring L1 cut out from the open end of the outer wall plate 11a16 so as to be connected to the inner slit 11a11. An outer slit 11a11 formed at a width H1 and a height F1 corresponding to the wire diameter may be provided (FIG. 9B). Further, the outer slit 11a11 is formed with a width H1 corresponding to the wire diameter of the large-diameter wire L1 (outer diameter of the protective tube L11), and the inner slit 11a14 is formed with a wire diameter of the small-diameter wire L2 (outer diameter of the covered wire L21). You may form in width H2 corresponding to. The outer slit 11a11 is cut out from the open end of the left wall plate 11a1 so as to have a width H1 and a height F1 corresponding to the wire diameter of the large-diameter wire L. However, the present invention is not limited to this embodiment. The outer slit 11a11 has a large diameter, as long as the amount of refrigerant entering the electrical component box 10 can be regulated by the gap between the inner slit 11a14, the electrical component box lid 12, and the small-diameter wiring L2. You may form in the magnitude | size which wiring L1 can penetrate.

PWB1: first printed circuit board, PWB2: second printed circuit board, RES: resonance chamber, MS: mica sheet, BZ: buzzer, SP: space, B: sheet metal, L: wiring, L1: large diameter wiring, L11 : Protection tube, L12: Covered wire, L2: Small-diameter wire, L21: Covered wire, F1: Height of outer slit, F2: Height of inner slit, H1: Width of outer slit, H2: Width of inner slit, S1: A gap between the outer slit and the protective tube of the large-diameter wiring, S2: A gap between the inner slit and the covered electric wire of the small-diameter wiring 10: Electrical component box 11: Electrical component box body, 11a: Perimeter wall plate, 11a1: Left Wall plate, 11a11: outer slit, 11a12: wiring insertion box, 11a121: bottom, 11a122: side wall, 11a13: inner wall plate, 11a14: inner slit, 11a15: wiring insertion 11a16: outer wall plate, 11a2: lower wall plate, 11a21, 11a22: tongue, 11b: first vertical wall plate, 11c: first horizontal wall plate, 11d: second horizontal wall plate, 11e: second vertical wall plate, 11f : Bottom plate 12: Electrical component box lid, 12b, 12c: Engagement part 13: Power cable attachment part, 13a: Pull-out port, 13b: Band, 13c: Terminal block, 13d: Hook, 13e: Elastic piece 20: Display / reception Case 30: Human detection sensor 40: Front panel, 41: Heat exchanger opening, 42: Wind direction plate, 43: Diffuser, 44: Electrical component storage area, 45: Maintenance lid, 46: Display / reception unit, 46: Human detection sensor decoration frame

Claims (3)

In an indoor unit of an air conditioner equipped with an electrical component box and a printed circuit board mounted on the electrical component box,
The electrical component box closes an electrical component box body having a bottom plate on which the printed circuit board is mounted and a peripheral wall plate surrounding the bottom plate, and an open side of a space surrounded by the peripheral wall plate of the electrical component box main body. An electrical component box lid, and an inner wall plate that is mounted on the inner peripheral side of the peripheral wall plate so as to overlap the peripheral wall plate,
The peripheral wall plate and the inner wall plate are either connected to the printed circuit board, the wire having a small wire diameter, or the wire having a large wire diameter provided on the distal end side with an electric wire having a diameter equal to or smaller than the wire diameter of the small diameter wire. Provide a wiring insertion part for inserting one of the wires,
The wiring insertion part is formed by cutting out from the open side end of the peripheral wall plate toward the printed circuit board and having a width corresponding to the wire diameter of the large-diameter wiring, and the outer slit. An inner slit formed with a width corresponding to the wire diameter of the small-diameter wiring formed by cutting away from the open end of the inner wall plate toward the printed circuit board,
The outer diameter slit, the inner slit, and the electrical component are inserted into the outer slit and the large diameter wiring for inserting the electric wire into the inner slit, or the small diameter wiring to be inserted into the outer slit and the inner slit. Enclose with the electrical component box lid mounted on the product box body,
The effective diameter of the gap between the outer slit, the electrical component box lid, and the large-diameter wiring, and the gap between the inner slit, the electrical component box lid, and the small-diameter wiring is set to be 3 mm or less. An air conditioner indoor unit characterized by the above.   The inner wall plate is disposed on the inner peripheral side of the peripheral wall plate at a distance from the peripheral wall plate instead of being mounted on the inner peripheral side of the peripheral wall plate, and the space between the peripheral wall plate and the inner wall plate is a bottom portion. The indoor unit of an air conditioner according to claim 1, wherein the indoor unit is formed in a box shape by side walls surrounding both sides of the bottom. In an indoor unit of an air conditioner equipped with an electrical component box and a printed circuit board mounted on the electrical component box,
The electrical component box closes an electrical component box body having a bottom plate on which the printed circuit board is mounted and a peripheral wall plate surrounding the bottom plate, and an open side of a space surrounded by the peripheral wall plate of the electrical component box main body. An electrical component box lid, and an outer peripheral plate mounted on the outer peripheral side of the peripheral wall plate in an overlapping manner on the peripheral wall plate,
The peripheral wall plate and the outer peripheral plate are either connected to the printed circuit board, the wire having a small wire diameter, or the wire having a large wire diameter provided on the tip side with an electric wire having a wire diameter equal to or smaller than the wire diameter of the small diameter wire. Provide a wiring insertion part for inserting one of the wires,
The wiring insertion part is formed by cutting out from the open side end of the outer peripheral plate toward the printed circuit board and having a width corresponding to the wire diameter of the large-diameter wiring, and the outer slit. An inner slit formed to have a width corresponding to the wire diameter of the small-diameter wiring formed by cutting out from the open end of the peripheral wall plate toward the printed circuit board,
The outer diameter slit, the inner slit, and the electrical component are inserted into the outer slit and the large diameter wiring for inserting the electric wire into the inner slit, or the small diameter wiring to be inserted into the outer slit and the inner slit. Enclose with the electrical component box lid mounted on the product box body,
The effective diameter of the gap between the outer slit, the electrical component box lid, and the large-diameter wiring, and the gap between the inner slit, the electrical component box lid, and the small-diameter wiring is set to be 3 mm or less. An air conditioner indoor unit characterized by the above.

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