JP6183603B2 - 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.

  An object of the present invention is to provide an indoor unit for an air conditioner that uses a slit for passing a wire and can regulate the cooling of a heat-generating component and the amount of refrigerant entering the inside without providing a special air flow passage. Is to provide.

In order to achieve the above object, an invention according to claim 1 is an air conditioner indoor unit in which an electrical component box on which a printed circuit board for air conditioning control is mounted, wherein the electrical component box is the printed circuit board. Mounted on the printed circuit board and surrounded by a peripheral wall plate, and an electric component box lid for closing an open side of the space surrounded by the peripheral wall plate of the electric component box main body. Provided with a wiring passage slit formed by cutting the peripheral wall plate of the product box body from the end of the peripheral wall plate, and provided with a shutter plate for closing a part of the slit on the electrical component box lid, The slits are for wiring passages except for the portions closed by the shutter plate, and the portions other than the wiring portions in the wiring passage portions are sized to allow air to flow and the effective diameter R thereof is 3 mm or less. Set to be The effective diameter R is obtained by “R = 4 × S × L”, S is an area excluding the wiring portion in the space of the slit closed by the shutter plate, and L is a circumference of the area portion. It is characterized by being long .
According to a second aspect of the present invention, in the indoor unit for an air conditioner according to the first aspect, the slit has a shape in which an open end side of the cut is widened.

  According to the present invention, the peripheral wall plate of the electrical component box body is provided with the slit for passing the wiring formed by cutting from the end of the peripheral wall plate, and the shutter plate for closing a part of the slit on the electrical component box lid Therefore, when the electrical component box cover is placed on the electrical component box main body and a part of the slit is closed by the shutter plate, the remaining part of the slit can be used for wiring passage through which air can flow. Therefore, the refrigerant in the electrical component box is formed by the entry of the refrigerant into the electrical component box while ensuring the passage for cooling the heat generating component without specially forming an air flow passage by the wiring passage portion. There is an advantage that an increase in the residual concentration of can be prevented. In addition, since the portion for passing the wiring in this way becomes a space limited to a size that does not increase the concentration of the refrigerant entering the electrical component box, even when the electrical component in the electrical component box ignites, There is also an advantage that the flame can be prevented from going out of the electrical component box, and the refrigerant leaking out of the electrical component box can be prevented from being ignited.

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 explanatory drawing of a slit and a shutter board | plate. It is explanatory drawing of the slit and shutter board | plate 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 have a base made of resin, but the electrical component box body 11 and the electrical component box lid 12 of the electrical component box 10 are on the outer surface. A heat-resistant and electromagnetic shield sheet metal B (see FIG. 6) 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) emitted by an operation of the 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 peripheral wall plate 11a over substantially the entire circumference. And the rectangular slit SL of the predetermined depth for wiring passage is provided in the left wall board 11a1 in the surrounding wall board 11a by making a notch so that a front end part may be an open end part. . In the vicinity of the slit SL, wiring guides 11f and 11g for guiding the wiring L extending from the inner surface of the electrical component box body 11 are formed (FIGS. 4 and 6). Moreover, tongue pieces 11a21 and 11a22 for attaching the electrical component box lid 12 are formed on the lower wall plate 11a2 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. The mica sheet MS is used to thermally and electrically insulate between 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. 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 passage 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 sounds when the receiver of the display / reception case 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. The electrical component box lid 12 is formed with a shutter plate 12a that closes a part of the inner side of the slit SL of the peripheral wall plate 11a when the electrical component box lid 12 is put on the electrical component box main body 11. Boxes 12b and 12c that engage with the tongue pieces 11a21 and 11a22 of the box body 11 are formed.

  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, connection of all the wirings related to the first and second printed circuit boards PWB1 and PWB2 is completed in advance. At the same time, the wiring L extending from the first printed circuit board PWB1 is guided by the wiring guides 11f and 11g and drawn out from the slit SL. The electrical component box lid 12 is aligned so that the boxes 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 attached to the electrical component box body 11. Cover.

  Thereby, the shutter plate 12a of the electrical component box lid 12 is positioned on the printed circuit board PWB2 side in the slit SL of the electrical component box body 11. At this time, the leading end of the shutter plate 12a may press the wiring L inserted through the slit SL. Further, the shutter plate 12a itself closes a part of the open circuit board PWB2 side of the slit SL (see FIGS. 6 and 7). As a result, the slit SL has a space in an area that is not closed by the shutter plate 12a for passing air through which air can flow, and air can flow between the outside and the inside of the electrical component box 10 through the space. It becomes.

  Therefore, in this embodiment, the wiring passage space that is not closed in the slit SL is low enough to prevent the residual concentration of the refrigerant entering the electrical component box from being ignited, and air that cools the heat-generating components flows. The length and width of the slit SL are set so as to have a possible size. As the size of the space for wiring passage, for example, it is desirable that the effective diameter R is 3 mm or less. The execution diameter R is obtained by “R = 4 × S / L”. S is the area of the portion excluding the wiring portion in the plane perpendicular to the air flow direction of the space described above, and L is the perimeter of the area portion.

  As a result, even if the refrigerant leaks from the refrigerant pipe, it becomes difficult for the refrigerant to enter the electrical component box 10 from the above-described space for wiring passage, and the refrigerant concentration in the electrical component box 10 is set to the ignition concentration. It is possible to regulate the following, and the explosion prevention of the electrical component box 10 can be realized. In addition, even when an electrical component in the electrical component box is ignited, the flame can be prevented from exiting the electrical component box, and the refrigerant leaking out of the electrical component box can be ignited. Can be prevented. Furthermore, the electrical component box 10 can be cooled by the air passing through the wiring passage space, and the heat generated by the heat generating components mounted on the printed circuit boards PWB1 and PWB2 can be effectively radiated.

  Further, when the electrical component box body 11 is closed by the electrical component box lid 12, the back surface of the electrical component box body 11, a part of the peripheral wall body 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.

  Further, the slit SL of the electrical component box body 11 is not limited to the rectangle described above, and as shown in FIG. 8, by forming oblique cut portions 11a11 and 11a12 at both corners on the open end side, It is good also as slit SL2 of the shape which expanded the open end side rather than the back end. In this case, the electrical component box lid 12 is provided with a shutter plate 12d that is widened in accordance with the size of the opening of the slit SL2. The slit SL2 having such a shape facilitates the operation of guiding the wiring L there.

PWB1: first printed circuit board, PWB2: second printed circuit board, RES: resonance chamber, MS: mica sheet, BZ: buzzer, SP: space, SL, SL2: slit, B: sheet metal 10: electrical component box 11: Electrical component box body, 11a: peripheral wall plate, 11a1: left wall plate, 11a11, 11a12: notch, 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, 11g: wiring guide 12: electrical component box cover, 12a: shutter plate, 12b, 12c: box 13: power cable mounting portion, 13a: outlet , 13b: band, 13c: terminal block, 13d: hook, 13e: elastic piece 20: display / reception case 30: human detection sensor 40: front panel, 41: opening for heat exchanger, 42: Wind direction plate, 43: diffuser, 44: electrical component box storage area, 45: maintenance lid, 46: display / reception unit, 46: human detection sensor decoration frame

Claims (2)

In an indoor unit of an air conditioner in which an electrical component box on which a printed circuit board for air conditioning control is mounted,
The electrical component box includes an electrical component box body on which the printed circuit board is mounted and the periphery of the printed circuit board is surrounded by a peripheral wall plate, and an electrical component that closes an open side of the space surrounded by the peripheral wall plate of the electrical component box body With a product box lid,
The peripheral wall plate of the electrical component box main body is provided with a wiring passage slit formed by cutting from an end of the peripheral wall plate, and the electrical component box cover is provided with a shutter plate for closing a part of the slit. ,
The slit is for wiring passage except for the portion closed by the shutter plate, and the portion other than the wiring portion of the wiring passage portion is sized to allow air to flow and its effective diameter R is 3 mm. The effective diameter R is determined by “R = 4 × S × L”, where S is an area excluding a wiring portion in the space of the slit closed by the shutter plate, L Is the perimeter of the area portion,
An air conditioner indoor unit.
In the indoor unit of the air conditioner according to claim 1,
The air conditioner indoor unit , wherein the slit has a shape in which an open end side of the cut is widened .

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