JP2019015456A - Indoor unit of air conditioner - Google Patents

Abstract

To provide an indoor unit of an air conditioner capable of suppressing fire spread even in the case where a motor ignites.SOLUTION: An indoor unit comprises a top plate 12a, a centrifugal fan 14, a motor 17 rotating the centrifugal fan 14, and a cover 30. The motor 17 has a cylindrical motor body 17a, and a rotational shaft 17b fixed to the centrifugal fan 14. The cover 30 is a fire-resistant cover covering the motor body 17a. The cover 30 covers at least 70% of the outside of an outer peripheral surface of the motor body 17a. The cover 30 is formed so that an average value of a distance from the cover 30 to an outer peripheral surface of the motor body 17a is made smaller than a maximum value of a distance of an outer edge of the motor body 17a from a center of the rotational shaft 17b in a view from a directional in which the rotational shaft 17b extends.SELECTED DRAWING: Figure 3

Description

  The present invention relates to an indoor unit of an air conditioner.

  The indoor unit of the air conditioner adjusts the temperature and humidity of the sucked indoor air, and blows out the adjusted air into the room by a fan. In the case of an indoor unit installed on the ceiling, a turbo fan or a sirocco fan is often used, and in a wall-mounted indoor unit, a cross flow fan is often used.

  For example, a ceiling-embedded indoor unit disclosed in Patent Document 1 (Japanese Patent Application Laid-Open No. 11-44433) employs a turbo fan. In this indoor unit, a motor is attached to the top plate of a cabinet (casing), and the motor rotates the turbo fan. The cabinet is composed of a case made of a steel plate and a heat insulating material for the purpose of preventing the spread of fire at the time of ignition. In this indoor unit, both the turbo fan and the motor are covered with a case made of a steel plate.

  As described above, if a fan or a motor is covered with a steel plate in the indoor unit, even if the fire ignites indoors and the spread of the fire spreads into the indoor unit, the spread of the fire around the indoor unit can be suppressed by the steel plate.

  However, if the indoor unit is not properly installed, or if an inappropriate voltage is supplied as the power supplied to the indoor unit, the motor of the indoor unit is It can be a source of ignition. Therefore, even if ignition occurs inside the motor, it is preferable to take measures so that the fire does not spread around the motor. In addition, if a fire has occurred in the room, it is preferable to be able to investigate whether the cause of the fire was in the motor of the indoor unit or in the outside of the indoor unit.

  The subject of this invention is providing the indoor unit of the air conditioning apparatus which can suppress the fire spread even if a motor ignites.

  An indoor unit of an air conditioner according to a first aspect of the present invention includes a casing, a fan, a motor that rotates the fan, and a cover. The fan is disposed in the casing. The motor has a cylindrical motor body and a rotating shaft that protrudes from the motor body and is fixed to the fan. The cover is a flame retardant cover that covers the motor body. The cover covers at least 70% or more of the outer peripheral surface of the motor body. Then, the cover is adjusted so that the average value of the distance from the cover to the outer peripheral surface of the motor body is smaller than the maximum value of the distance from the center of the rotation axis of the outer edge of the motor body as viewed in the direction in which the rotation axis of the motor extends. Is formed.

  Here, since the cover arranged outside the outer peripheral surface of the motor body covers at least 70% or more of the outer peripheral surface of the motor main body, even if the motor ignites, the fire spreads around the motor. Is suppressed.

  In addition, here, the average value of the distance from the cover to the outer peripheral surface of the motor body is smaller than the maximum value of the distance from the center of the rotation axis of the outer edge of the motor body as viewed in the direction in which the rotation axis of the motor extends. . That is, the volume of the space from the cover to the outer peripheral surface of the motor body is small. For this reason, even if the motor ignites, it is easy to suppress the fire in the space from the cover to the outer peripheral surface of the motor body, and the spread of fire around the motor is suppressed.

  The indoor unit of the air conditioning apparatus according to the second aspect of the present invention is the indoor unit according to the first aspect, and the motor further includes leg portions that protrude from the motor body. The leg portion is fixed to the motor support portion. The motor support is a part of the casing or a member attached to the casing. The cover further covers the side of the leg that is opposite to the side of the motor body.

  Here, a cover that covers at least 70% or more of the outer peripheral surface of the motor main body further covers a leg protruding from the motor main body. Thereby, it is suppressed that the clearance gap which connects the outer peripheral surface of a motor main body and the exterior of a motor arises around a leg part. For this reason, even if the motor ignites, it is possible to more reliably suppress the spread of fire.

  The indoor unit of the air conditioning apparatus which concerns on the 3rd viewpoint of this invention is an indoor unit which concerns on the 1st or 2nd viewpoint, Comprising: The motor further has the electric wire which protrudes from the 1st part of a motor main body. The cover is formed with an opening or a notch for passing an electric wire.

  Here, although the electric wire protrudes from the motor body, the electric wire can be connected to an external power source or the like by passing through an opening or notch formed in the cover.

  An indoor unit of an air conditioner according to a fourth aspect of the present invention is an indoor unit according to the third aspect, and is a center of the rotation shaft and one end of the first portion of the motor body when viewed from the direction in which the rotation shaft of the motor extends. So that the opening or notch formed in the cover is removed from the area surrounded by the first straight line connecting the center of the rotation axis and the second straight line connecting the center of the rotating shaft and the other end of the first part of the motor body. A cover is disposed on the motor body.

  If abnormal heat is generated inside the motor main body and fire is generated in the motor main body, there is a high possibility that fire will jump out from the first portion of the motor main body, which is a portion from which the electric wire protrudes.

  In view of this, here, the opening or notch formed in the cover is removed from the predetermined area, and even if ignition occurs in the motor body, it is possible to suppress the fire from jumping outside the cover. Yes.

  An indoor unit of an air conditioner according to a fifth aspect of the present invention is the indoor unit according to any one of the first to fourth aspects, and the motor main body has a gap between the cover and the motor. The cover is arranged.

  Here, the cover and the motor are not brought into close contact with each other, and the cover is disposed so as to leave a gap therebetween, so that the heat dissipation of the motor is ensured. When adopting a structure in which the cover and the motor are in close contact with each other, it is necessary to increase the heat resistance of the motor itself, which increases the price of the motor. However, since there is a gap between the cover and the motor here, the motor Can lower the price.

  An indoor unit of an air conditioner according to a sixth aspect of the present invention is the indoor unit according to the first aspect, and the motor further includes a leg portion fixed to the motor support portion. The motor support is a part of the casing or a member attached to the casing. And the opening or notch for letting the leg part of a motor pass is formed in the cover.

  Here, the motor has a leg portion, but if the leg portion is large, the cover becomes large if a structure in which the motor including the leg portion is covered with the cover is adopted. In view of this, an opening or notch for passing the leg portion is formed in the cover to reduce the size of the cover.

  The indoor unit of the air conditioning apparatus which concerns on the 7th viewpoint of this invention is an indoor unit which concerns on a 6th viewpoint, Comprising: A cover is fixed to a motor.

  In the case of adopting a structure in which the leg portion is exposed to the outside of the cover from the opening or notch formed in the cover, the cover can be brought close to the motor body. In view of this, here, the cover is fixed to the motor, and a part of the leg portion outside the cover is fixed to the motor support portion, so that both the motor and the cover are supported by the motor support portion. Yes. By integrating the motor and the cover, it is possible to suppress a problem that a rubbing sound caused by motor vibration occurs between them.

  An indoor unit of an air conditioner according to an eighth aspect of the present invention is the indoor unit according to any one of the first to seventh aspects, and the cover further includes an end portion in the direction in which the rotation shaft of the motor body extends. Cover partially.

  Here, the cover covers at least 70% or more of the outer peripheral surface of the motor body, and partially covers the end of the motor body in the direction in which the rotation shaft extends. Thereby, even if the motor ignites, it is further suppressed that the fire spreads around the motor.

  The indoor unit of the air conditioning apparatus according to the ninth aspect of the present invention is the indoor unit according to any one of the first to eighth aspects, and the cover includes two or more members including the first member and the second member. It is divided. The first member and the second member partially overlap in a state where the motor body is covered.

  Here, by adopting a cover having a divided structure, the time required for the process of covering the motor main body with the cover is shortened in the assembly operation of the indoor unit. In addition, since the first member and the second member partially overlap in a state where the motor body is covered, even if the motor is ignited, it is possible to prevent the fire from coming out of the cover.

  An indoor unit of an air conditioner according to a tenth aspect of the present invention is the indoor unit according to any one of the first to ninth aspects, and the motor main body has a gap between the cover and the fan. The cover is arranged.

  Here, by securing a gap between the rotating fan and the non-rotating cover, it is possible to suppress a problem that the two come into contact with each other to generate noise.

  In the indoor unit of the air conditioner according to the first aspect of the present invention, the cover disposed outside the outer peripheral surface of the motor main body covers at least 70% or more of the outer peripheral surface of the motor main body. In this case, the fire is prevented from spreading around the motor. In addition, the average value of the distance from the cover to the outer peripheral surface of the motor body is smaller than the maximum value of the distance from the center of the rotation axis of the outer edge of the motor body as viewed in the direction in which the rotation axis of the motor extends. Even when fire is ignited, it is easy to suppress the fire in the space from the cover to the outer peripheral surface of the motor body.

  In the indoor unit of the air conditioner according to the second aspect of the present invention, a gap that connects the outer peripheral surface of the motor body and the outside of the motor is suppressed around the leg portion, and the motor ignites temporarily. In addition, the spread of fire can be more reliably suppressed.

  In the indoor unit of the air conditioning apparatus according to the third aspect of the present invention, an electric wire can be connected to an external power source or the like.

  In the indoor unit of the air conditioning apparatus according to the fourth aspect of the present invention, it is possible to prevent fire from jumping outside the cover even if ignition occurs in the motor body.

  In the indoor unit of the air conditioner according to the fifth aspect of the present invention, the price of the motor can be reduced.

  In the indoor unit of the air conditioning apparatus according to the sixth aspect of the present invention, the cover can be downsized.

  In the indoor unit of the air-conditioning apparatus according to the seventh aspect of the present invention, it is possible to suppress a problem that a rubbing sound caused by motor vibration is generated between the motor and the cover.

  In the indoor unit of the air conditioning apparatus according to the eighth aspect of the present invention, even if the motor ignites, it is further suppressed that the fire spreads around the motor.

  In the indoor unit of the air conditioning apparatus according to the ninth aspect of the present invention, the time required for the step of covering the motor main body with the cover is shortened in the assembling work of the indoor unit by employing the cover having the divided structure.

  In the indoor unit of the air conditioning apparatus according to the tenth aspect of the present invention, by securing a gap between the rotating fan and the non-rotating cover, a problem that noise occurs due to contact between the two is suppressed.

The external appearance perspective view of the indoor unit which concerns on the 1st Embodiment of the past and this invention. The longitudinal cross-sectional view of the conventional indoor unit. The disassembled perspective view of the centrifugal fan of the indoor unit which concerns on 1st Embodiment, a motor, and a cover. The longitudinal cross-sectional view of the centrifugal fan of the indoor unit which concerns on 1st Embodiment, a motor, and a cover. Explanatory drawing of the clearance dimension of the motor and cover of the indoor unit which concerns on 1st Embodiment. The top view of the cover of the indoor unit which concerns on 1st Embodiment. The top view of the cover of the indoor unit which concerns on the modification 1A of 1st Embodiment. The external appearance perspective view of the cover of the indoor unit which concerns on the modification 1B of 1st Embodiment. The longitudinal cross-sectional view of the centrifugal fan of the indoor unit which concerns on the modification 1B of 1st Embodiment, a motor, and a cover. The external appearance perspective view of the indoor unit which concerns on 2nd Embodiment of this invention. The disassembled perspective view of the multiblade fan of the indoor unit which concerns on 2nd Embodiment, a motor, and a cover. The longitudinal cross-sectional view of the multiblade fan of the indoor unit which concerns on 2nd Embodiment, a motor, and a cover. The external appearance perspective view of the indoor unit which concerns on 3rd Embodiment of this invention. The longitudinal cross-sectional view of the indoor unit which concerns on 3rd Embodiment. The exploded perspective view of the motor of the indoor unit which concerns on 3rd Embodiment, a cover, and peripheral components. The longitudinal cross-sectional view around the motor of the indoor unit which concerns on 3rd Embodiment. FIG. 16 is a partially enlarged view of FIG. 15. The exploded perspective view of the motor of an indoor unit concerning the modification of a 3rd embodiment, a cover, and peripheral parts. The longitudinal cross-sectional view around the motor of the indoor unit which concerns on the modification of 3rd Embodiment.

<Conventional form>
In FIG. 1, the external appearance perspective view of the indoor unit 10 of the conventional air conditioning apparatus is shown. Here, the indoor unit 10 is a ceiling-mounted unit, and mainly includes a casing 12 that houses various components therein, and a decorative panel 13 that is disposed below the casing 12.

  The casing 12 made of metal is a box-shaped member having an open bottom surface. As shown in FIG. 2 (a schematic side sectional view of the indoor unit 10), the metal casing 12 has an opening formed in the ceiling of a room (room) to be air-conditioned. Inserted and placed. The decorative panel 13 is disposed so as to surround the outer periphery of the suction port 13a in order to blow the air from the casing 12 into the room, and the suction port 13a disposed in the substantially center for sucking the room air into the casing 12. The air outlet 13b is fitted into the ceiling opening.

  The casing 12 mainly includes a centrifugal fan 14 that sucks indoor air into the casing 12 through the suction port 13a of the decorative panel 13 and blows it in the outer circumferential direction, a heat exchanger 15 that surrounds the outer periphery of the centrifugal fan 14, and a suction A bell mouth 16 for guiding the air sucked from the mouth 13a to the centrifugal fan 14 is disposed. The centrifugal fan 14 is connected to a rotating shaft 17 b of a motor 17 fixed at the approximate center of the top plate 12 a of the casing 12 and is driven to rotate by the motor 17.

  The centrifugal fan 14 is made of resin and mainly includes a disk-shaped main plate 21 connected to the motor 17 and a plurality of annularly arranged around the rotation axis O of the main plate 21 on the side opposite to the fan motor 17 of the main plate 21. It has a blade 22 and an annular shroud 23 arranged so as to sandwich the plurality of blades 22 between the main plate 21 and the rotation axis O direction. The main plate 21 is a member formed so that a substantially frustoconical hub portion 21a protrudes toward the suction port 13a side at the center thereof, and a plurality of blades 22 on the fan motor 17 side in the outer peripheral portion thereof. The ends of the are tied. The shroud 23 is a bell-shaped member that protrudes while curving toward the suction port 13a from the outer peripheral portion toward the opening in the central portion, and connects the ends of the plurality of blades 22 on the anti-fan motor 17 side. The blade 22 is a turbo blade-shaped member that is inclined backward with respect to the rotation direction of the centrifugal fan 14.

<First embodiment for carrying out the present invention>
(1) Basic configuration of indoor unit of air conditioner The indoor unit of an air conditioner according to an embodiment of the present invention further includes a cover that covers the motor 17 on the indoor unit 10 of the conventional air conditioner. Is a unit.

(2) Detailed configuration of motor and cover covering motor (2-1) Motor The motor 17 includes a cylindrical motor body 17a in which a coil is resin-molded, a rotating shaft 17b protruding from the motor body 17a, and a motor body. And three leg portions 17c projecting radially outward from the outer peripheral surface of 17a.

  As shown in FIG. 4A, the hub portion 21a of the main plate 21 of the centrifugal fan 14 is fixed to the tip of the rotating shaft 17b. Most of the motor body 17a is disposed in a space surrounded by the hub portion 21a.

  A substrate is built in a portion of the motor body 17a opposite to the side from which the rotating shaft 17b protrudes. An electric wire 17e connected to a built-in substrate extends outward from a connector portion 17d protruding radially outward from the outer peripheral surface of the motor body 17a.

  As shown in FIG. 4A, the three leg portions 17 c have a shape that holds the vibration isolating rubber 18, and are fastened to the top plate 12 a (see FIG. 2) of the casing 12 with each holding the vibration isolating rubber 18. The Specifically, the motor 17 is fixed to the top plate 12a by a bolt 19 penetrating the anti-vibration rubber 18 and the top plate 12a.

(2-2) Cover The cover 30 is a flame retardant cover that covers the motor body 17a. Here, the material of the cover is austenitic stainless steel, but a flame-retardant resin cover or an aluminum cover may be employed.

  As is clear from FIG. 3 and the like, the cover 30 covers at least 70% or more of the outer peripheral surface of the motor body 17a. Here, a cover that covers 90% or more of the outer peripheral surface of the motor main body 17a is employed. Specifically, the outside of the three leg portions 17c protruding from the outer peripheral surface of the motor main body 17a (the side opposite to the motor main body 17a side of the leg portion 17c) is also covered with the cover 30 (see FIG. 4A). This realizes a state in which the outer side of the outer peripheral surface of the motor body 17a is almost covered except for a portion of a notch 33a for allowing passage of an electric wire 17e described later.

  The cover 30 further partially covers the end of the motor body 17a on the side where the rotating shaft 17b protrudes. As shown in FIG. 3 and FIG. 4A, annular step surfaces 17 f 1, 17 f 2, and 17 f 3 are present on the protruding portion of the rotating shaft 17 b, and the step surfaces 17 f 1, 17 f 2 are the annular plane portions of the cover 30. 31 is covered.

  The cover 30 extends in parallel with the rotation shaft 17b from the end of the annular inclined surface portion 32, the annular inclined surface portion 32 extending from the peripheral edge of the annular flat surface portion 31, and the annular flat surface portion 31 having a hole passing through the rotation shaft 17b in the center. The tube portion 33 and a plurality of fixing tabs 34 protruding radially outward from the tube portion 33 are provided. The inclination angle of the annular inclined surface portion 32 is equal to the inclination angle of the hub portion 21a of the centrifugal fan 14, as shown in FIG. 4A. The annular inclined surface portion 32 and the cylindrical portion 33 cover the outside of the outer peripheral surface of the motor body 17a. Moreover, the cylinder part 33 also covers the outer side of the three leg parts 17c. The plurality of fixing tabs 34 of the cover 30 are fixed to the top plate 12a of the casing 12 by bolts via vibration damping sheets (not shown).

  As shown in FIG. 4A, when the motor 17 and the cover 30 are fixed to the top plate 12a of the casing 12, a gap is secured between the outer peripheral surface of the motor body 17a of the motor 17 and the cover 30, and the cover 30 And a space between the main plate 21 of the centrifugal fan 14 are also secured.

  The shape of the cover 30 is determined so that the gap between the outer peripheral surface of the motor body 17a and the cover 30 is as small as possible. As shown in FIG. 4B, the distance from the cover 30 to the outer peripheral surface of the motor main body 17a is a size (for example, distances G1, G2, G3,... G10 shown in FIG. 4B) in each part of the cover 30. . Here, the average values of the distances (G1, G2, G3,... G10) to the outer peripheral surface of the motor main body 17a in each part of the cover 30 are the values of the motor main body 17a as viewed in the direction in which the rotating shaft 17b of the motor 17 extends. The shape of the cover 30 is determined so as to be smaller than the maximum value R of the distance from the center O of the rotating shaft 17b of the outer edge 17ae (see FIGS. 4B and 5). In the present embodiment, since the shape of the motor body 17a is cylindrical, the maximum value R of the distance from the center O of the rotating shaft 17b of the outer edge 17ae of the motor body 17a matches the radius of the motor body 17a. If a polygonal cylindrical motor main body is employed, the maximum value of the distance from the center of the rotating shaft of the outer edge of the motor main body is the distance from the rotating shaft to the top of the outer edge of the cylindrical motor main body.

  As described above, the cover 30 is formed with the notch 33 a for passing the electric wire 17 e of the motor 17. Specifically, a notch 33a is formed in the cylindrical portion 33 of the cover 30 at a position slightly shifted from the center of the portion facing the connector portion 17d of the motor 17 as shown in FIGS. . The electric wire 17e of the motor 17 is slightly bent and fitted into the notch 33a, and the cover 30 is fixed to the top plate 12a of the casing 12 in this state.

(3) Features (3-1)
In the indoor unit 10 of the air conditioner according to the first embodiment, the cover 30 disposed outside the outer peripheral surface of the motor main body 17a covers at least 70% or more of the outer peripheral surface of the motor main body 17a. Even when 17 ignites inside, it is suppressed that the fire spreads around the motor 17.

  Further, the distance (G1) from the cover 30 to the outer peripheral surface of the motor body 17a is larger than the maximum value R of the distance from the center 0 of the rotation axis 17b of the outer edge 17ae of the motor body 17a in the direction of extension of the rotation shaft 17b of the motor 17. , G2, G3,... G10) are small. That is, the volume of the space from the cover 30 to the outer peripheral surface of the motor body 17a is small. For this reason, even if the motor 17 is ignited, it is easy to suppress the fire in the space from the cover 30 to the outer peripheral surface of the motor body 17a, and the spread of fire around the motor 17 is suppressed.

  Furthermore, if a fire has occurred in the room, it is easy to investigate whether the cause of the fire is the motor 17 of the indoor unit 10 or whether there is a cause of ignition outside the indoor unit 10.

(3-2)
In the indoor unit 10 of the air conditioning apparatus according to the first embodiment, the cover 30 that covers at least 70% or more of the outer peripheral surface of the motor main body 17a further covers a plurality of legs 17c protruding from the motor main body 17a. . Thereby, it is suppressed that the clearance gap which connects the outer peripheral surface of the motor main body 17a and the exterior of the motor 17 around the leg part 17c. For this reason, even if the motor 17 is ignited, it is possible to more reliably suppress the spread of fire.

(3-3)
In the indoor unit 10 of the air conditioner according to the first embodiment, the electric wire 17e protrudes from the motor body 17a, but the electric wire 17e is connected to an external power source or the like by passing through a notch 33a formed in the cover 30. Can be made.

(3-4)
In the indoor unit 10 of the air conditioning apparatus according to the first embodiment, the cover 30 and the motor 17 are not brought into close contact with each other, and the cover 30 is disposed so that a gap is left between them. Secured. In the case of adopting a structure in which the cover 30 and the motor 17 are brought into close contact with each other, it is necessary to increase the heat resistance of the motor itself, and the price of the motor increases. Here, a gap is provided between the cover 30 and the motor 17. Therefore, the price of the motor 17 can be reduced.

(3-5)
In the indoor unit 10 of the air conditioning apparatus according to the first embodiment, the cover 30 covers at least 70% or more of the outer peripheral surface of the motor main body 17a, and the end of the motor main body 17a in the direction in which the rotation shaft 17b extends extends. The cover 30 is partially covered by the annular flat surface portion 31. Thereby, even if the motor 17 ignites, it is further suppressed that the fire spreads around the motor 17.

(4) Modification (4-1) Modification 1A
In the first embodiment, as shown in FIG. 5, the notch 33 a is formed at a position slightly shifted from the center of the portion of the cylindrical portion 33 of the cover 30 that faces the connector portion 17 d of the motor 17. Yes. Thereby, even if a fire is generated inside the motor 17 and a fire is ejected from the connector portion 17d, the fire is prevented from coming out from the notch 33a.

  However, the cover 130 shown in FIG. 6 can also be adopted when it is desired to more surely suppress the ejection of fire to the outside of the cover.

  A cover 130 according to Modification 1A shown in FIG. 6 is used in place of the cover 30 of the first embodiment, and is different from the cover 130 in the position of the notch through which the electric wire 17e of the motor 17 is passed.

  The notch 133a of the cover 130 is formed at a position completely removed from a portion of the cylindrical portion 133 (corresponding to the cylindrical portion 33) of the cover 130 that faces the connector portion 17d of the motor 17. Specifically, when viewed from the direction in which the rotation shaft 17b of the motor 17 extends (viewpoint in FIG. 6), the first straight line L1 connecting the center O of the rotation shaft 17b and the one end 17d1 of the connector portion 17d of the motor body 17a is rotated. The motor body 17a is configured such that the notch 133a formed in the cover 130 is removed from the region S surrounded by the second straight line L2 connecting the center O of the shaft 17b and the other end 17d2 of the connector portion 17d of the motor body 17a. A cover 130 is arranged on the front side.

  If the cover 130 is configured and arranged in this way, even if the coil abnormally heats up inside the motor body 17a and ignites in the motor 17 and fire is ejected from the connector portion 17d, the cover 130 is placed outside the cover 130. There is almost no fire popping out.

(4-2) Modification 1B
In the first embodiment, the cover 30 that covers at least 70% or more of the outer peripheral surface of the motor main body 17a further covers the plurality of leg portions 17c protruding from the motor main body 17a. Instead of this, an indoor unit that exposes the legs 170c of the motor 170 to the outside of the cover 230 as shown in FIGS. 7 and 8 may be employed.

  As shown in FIG. 7, the cover 230 includes an annular flat surface portion 231 in which a hole through which the rotation shaft 170 b of the motor 170 passes is opened in the center, an annular inclined surface portion 232 extending from the periphery of the annular flat surface portion 231, and an annular inclined surface portion 232. And a plurality of fixing tabs 234 projecting radially outward from the cylindrical portion 233. The annular inclined surface portion 232 and the cylindrical portion 233 cover the outside of the outer peripheral surface of the motor body 170a. The tube portion 233 is formed with notches 233b for avoiding interference with the three leg portions 170c. In addition, another notch 233a for passing the electric wire of the motor 170 is also formed in the tube portion 233.

  In addition to the cover 230, a lid 239 is provided opposite to the end surface of the motor 170 opposite to the side from which the rotating shaft 170 b projects, and the lid 239 covers the motor 170 together with the cover 230. The lid 239 includes a disc 239a and three tabs 239b that protrude outward in the radial direction from the disc 239a via a stepped portion. The cover 230 is attached to the motor 170 from the rotating shaft 170b side, the cover 239 is covered from the opposite side, and the fixing tab 234 of the cover 230 and the tab 239b of the cover 239 are fastened. And integrated. It should be noted that a disc-shaped elastic member (such as sponge or rubber) is preferably sandwiched between the lid 239 and the motor 170 to improve the degree of integration.

  As shown in FIG. 8, the motor 170 integrated with the cover 230 and the lid 239 is fixed to the casing of the indoor unit via the vibration isolating rubber 18. In this state, the leg portion 170 c of the motor 170 protrudes radially outward from the notch 233 b of the cylindrical portion 233 of the cover 230. However, the cover 230 substantially covers the motor 170 except for the portions of the notches 233a and 233b.

  If the cover 230 as described above is employed, the cover 230 can be reduced in size. In addition, as shown in FIG. 8, the gap between the motor 170 and the cover 230 becomes small, and even if the motor 170 is ignited, it is easy to suppress the fire in the space from the cover 230 to the motor 170.

  Further, here, the cover 230 is fixed (integrated) to the motor 170 using the lid 239, and a part of the leg portion 170c protruding to the outside of the cover 230 is fixed to the casing of the indoor unit. Both covers 230 are supported by the casing. Since the motor 170 and the cover 230 are integrated, it is possible to suppress a problem that a rubbing sound due to motor vibration occurs between them.

  Note that the main plate 21 of the centrifugal fan 14 indicated by a two-dot chain line in FIG. 8 does not contact the cover 230 and the main plate 21 does not contact the cover 230 even when an impact is applied when the indoor unit is transported or dropped. It shows that it hits the plate 12a.

(4-3) Modification 1C
In the first embodiment, the cover 30 is formed with the notch 33a for passing the electric wire 17e of the motor 17, but a hole (opening) may be formed in the cover 30 instead of the notch 33a. .

<Second Embodiment for Implementing the Present Invention>
(1) Basic Configuration of Indoor Unit of Air Conditioner FIG. 9 shows an appearance of a floor-standing indoor unit 40 according to the second embodiment of the present invention. The indoor unit 40 of this air conditioner is placed on the floor of the room, sucks room air from the suction ports 48a and 48b arranged on the left and right sides of the lower part, and blows the air after air conditioning to the blower arranged on the upper part. It blows out into the room from outlets 46a and 46b. A motor mounting plate 42 a shown in FIG. 10 is fixed to the back surface (not shown) of the casing 42 of the indoor unit 40.

  In the casing 42 of the indoor unit 40, a multi-blade fan 44 shown in FIG. 10, a motor 47 that rotates the multi-blade fan 44, a cover 60 that covers the motor 47, and the like are disposed along with a heat exchanger and the like.

(2) Detailed configuration of motor and cover covering motor (2-1) Motor The motor 47 includes a cylindrical motor body 47a in which a coil is resin-molded, a rotating shaft 47b protruding from the motor body 47a, and a motor body. And a leg portion 47c projecting radially outward from the outer peripheral surface of 47a.

  As shown in FIG. 11, the multiblade fan 44 is fixed to the tip of the rotating shaft 47b. A connector portion 47d is formed on a portion of the motor body 47a opposite to the side from which the rotating shaft 47b protrudes. The leg 47c is fixed to the motor holding frame 49 as shown in FIG. The motor holding frame 49 is fastened to the above-described motor mounting plate 42a with bolts.

(2-2) Cover The flame-retardant cover 60 is a member that covers at least 70% or more of the outer periphery of the motor body 47a. The outside of the leg 47c protruding from the outer peripheral surface of the motor main body 47a and the outside of the motor holding frame 49 are covered with a cover 60 (see FIG. 11). This realizes a state in which the outer side of the outer surface of the motor main body 47a is almost covered except for the notch 63a for allowing the electric wire of the motor 47 to pass through.

  Further, the cover 60 further partially covers an end portion of the motor main body 47a on the side where the rotation shaft 47b protrudes. As shown in FIGS. 10 and 11, an annular surface 47 f is present on the protruding portion of the rotating shaft 47 b, but is covered with the annular flat surface portion 61 of the cover 60.

  The cover 60 extends in parallel with the rotation shaft 47b from the end of the annular inclined surface portion 62, an annular inclined surface portion 62 extending from the periphery of the annular flat surface portion 61, and an annular flat surface portion 61 having a hole through which the rotation shaft 47b passes in the center. It has a cylindrical portion 63 and a flange 64 that extends radially outward from the cylindrical portion 63. The annular inclined surface portion 62 and the cylindrical portion 63 cover the outside of the outer peripheral surface of the motor main body 47a. The flange 64 of the cover 60 is fixed to a motor mounting plate 42a provided on the casing 42 by a bolt via a vibration-proof sheet (not shown).

  As shown in FIG. 11, in a state where the motor 47 and the cover 60 are fixed to the motor mounting plate 42a, a gap is secured between the outer peripheral surface of the motor main body 47a of the motor 47 and the cover 60. A clearance is also secured between the blade fan 44 and the blade fan 44.

  The shape of the cover 60 is determined so that the gap between the outer peripheral surface of the motor main body 47a and the cover 60 is as small as possible. As shown in FIG. 11, the distance from the cover 60 to the outer peripheral surface of the motor main body 67 a is a dimension that varies in each part of the cover 60. Here, the average value of the distance to the outer peripheral surface of the motor main body 47a in each part of the cover 60 is the maximum distance from the center of the rotation shaft 47b of the outer edge of the motor main body 47a in the direction of the direction in which the rotation shaft 47b of the motor 47 extends. The shape of the cover 60 is determined so as to be smaller than the value R.

(3) Features (3-1)
In the indoor unit 40 of the air conditioner according to the second embodiment, the cover 60 disposed outside the outer peripheral surface of the motor main body 47a covers at least 70% or more of the outer peripheral surface of the motor main body 47a. Even when 47 ignites inside, the fire is suppressed from spreading around the motor 47.

  Further, the average value of the distance from the cover 60 to the outer peripheral surface of the motor main body 47a is larger than the maximum value R of the distance from the center of the rotation shaft 47b of the outer edge of the motor main body 47a in the direction in which the rotation shaft 47b of the motor 47 extends. It is getting smaller. That is, the volume of the space from the cover 60 to the outer peripheral surface of the motor main body 47a is small. For this reason, even if the motor 47 is ignited, it is easy to suppress the fire in the space from the cover 60 to the outer peripheral surface of the motor body 47a, and the spread of fire around the motor 47 is suppressed.

(3-2)
In the indoor unit 40 of the air conditioning apparatus according to the second embodiment, the cover 60 that covers at least 70% or more of the outer peripheral surface of the motor main body 47a further covers the leg portions 47c that protrude from the motor main body 47a. Thereby, it is suppressed that the clearance gap which connects the outer peripheral surface of the motor main body 47a and the exterior of the motor 47 around the leg part 47c is suppressed. For this reason, even if the motor 47 ignites, it is possible to more reliably suppress the spread of fire.

(3-3)
In the indoor unit 40 of the air conditioning apparatus according to the second embodiment, the cover 60 and the motor 47 are not brought into close contact with each other, and the cover 60 is disposed so that a gap is left between them. Secured.

(3-4)
In the indoor unit 40 of the air conditioner according to the second embodiment, the cover 60 covers at least 70% or more of the outer peripheral surface of the motor main body 47a, and the end of the motor main body 47a in the direction in which the rotation shaft 47b extends extends. The cover 60 is partially covered by the annular flat surface portion 61. Thereby, even if the motor 47 ignites, it is further suppressed that the fire spreads around the motor 47.

<Third embodiment for carrying out the present invention>
(1) Basic Configuration of Indoor Unit of Air Conditioner FIG. 12 shows the appearance of a wall-mounted indoor unit 70 according to the third embodiment of the present invention. As shown in FIG. 13, the indoor unit 70 of the air conditioner includes a casing 72, a heat exchanger 73, a cross flow fan 74, and the like.

  The casing 72 has a bottom frame 72a in addition to the front panel and the side plate, and the heat exchanger 73 and the cross flow fan 74 are attached to the bottom frame 72a.

  The heat exchanger 73 exchanges heat with the passing air. A cross flow fan 74 is located below the heat exchanger 73 having an inverted V shape. The cross flow fan 74 passes the air taken in from the room against the heat exchanger 73 and blows it out into the room from below.

  Drain pans 75 and 76 for receiving condensed water falling from the heat exchanger 73 are arranged below the front and rear sides of the heat exchanger 73.

(2) Detailed configuration of motor and cover covering motor (2-1) Motor The motor 77 has a cylindrical motor main body 77a in which a coil is resin-molded, and a rotating shaft 77b protruding from the motor main body 77a. ing. The end of the cross flow fan 74 is fixed to the tip of the rotating shaft 77b.

(2-2) Cover The stainless steel cover is divided into a first cover 80 and a second cover 90 as shown in FIG. These covers 80 and 90 are put on the motor 77 from the front and rear in the direction of the rotation shaft 77 b of the motor 77. In the installed state shown in FIG. 15, the pair of covers 80, 90 cover at least 70% or more of the outer periphery of the motor body 77a. Here, the state which almost covered the outer side of the outer peripheral surface of the motor main body 77a is implement | achieved.

  Further, the pair of covers 80 and 90 further partially cover the end 77f on the side where the rotating shaft 77b of the motor body 77a protrudes and the end 77g on the opposite side.

  The first cover 80 includes an annular flat surface portion 81 having a hole through which the rotation shaft 77 b passes in the center, and a cylindrical portion 83 extending from the peripheral edge of the annular flat surface portion 81. The annular flat surface portion 81 covers an end portion 77f on the projecting side of the rotation shaft 77b of the motor main body 77a.

  The second cover 90 has an annular flat surface portion 91 and a cylindrical portion 93 extending from the peripheral edge of the annular flat surface portion 91. The annular flat surface portion 91 covers the end portion 77g of the motor main body 77a.

  As shown in FIG. 16, the cylindrical portion 83 of the first cover 80 and the cylindrical portion 93 of the second cover 90 partially overlap each other outside the outer peripheral surface of the motor main body 77a. A radial gap dimension D1 between the cylindrical portion 83 and the cylindrical portion 93 is 1 mm or less. Further, a gap dimension D2 between an arch portion of the front and rear drain pan connecting member 79 described later and the cylinder portion 83 of the first cover 80 and a gap dimension D3 between the motor main body 77a and the cylinder portion 93 of the second cover 90 are also 1 mm or less. is there.

  As shown in FIG. 15, the motor 77 with the covers 80 and 90 covered is placed on resin-made motor support members 78a, 78b, and 78c. These motor support members 78a, 78b, 78c are fixed to the bottom frame 72a of the casing 72 described above.

  Further, a front / rear drain pan connecting member 79 for connecting the end portions of the drain pans 75 and 76 is disposed above the motor 77 covered with both covers 80 and 90. The front / rear drain pan connecting member 79 is formed with a drain passage 79a (see FIG. 15) through which water flows from the drain pan 75 on the back side to the drain pan 76 on the front side.

(3) Features (3-1)
In the indoor unit 70 of the air conditioner according to the third embodiment, the first cover 80 and the second cover 90 arranged outside the outer peripheral surface of the motor main body 77a cover at least 70% or more of the outer peripheral surface of the motor main body 77a. Since it covers, even if the motor 77 ignites inside, it is suppressed that the fire spreads around the motor 77.

  Further, the average distance from both covers 80, 90 to the outer peripheral surface of the motor main body 77a is larger than the maximum value of the distance from the center of the rotary shaft 77b of the outer edge of the motor main body 77a as viewed in the direction in which the rotary shaft 77b of the motor 77 extends. The value is getting smaller. That is, the volume of the space from the covers 80 and 90 to the outer peripheral surface of the motor main body 77a is very small. For this reason, even if the motor 77 is ignited, the spread of fire around the motor 77 is suppressed.

  Furthermore, if a fire has occurred in the room, it is easy to investigate whether the cause of the fire is the motor 77 of the indoor unit 70 or whether there is a cause of ignition outside the indoor unit 70.

(3-2)
In the indoor unit 70 of the air conditioner according to the third embodiment, the cover that covers the motor 77 is divided into a first cover 80 and a second cover 90. And as shown in FIG. 16, the 1st cover 80 and the 2nd cover 90 overlap in part in the state which covered the motor main body 77a.

  Here, since the cover of the divided structure is adopted, the time required for the step of covering the motor main body 77a in the assembly operation of the indoor unit 70 is shortened. Further, since the first cover 80 and the second cover 90 partially overlap in a state where the motor main body 77a is covered, even if the motor 77 is ignited, there is almost no possibility that the fire goes out of the cover.

(4) Modification In the third embodiment described above, the first cover 80 and the second cover 90 that are put on the motor 77 from the front and rear in the direction of the rotation shaft 77b of the motor 77 are employed, but as shown in FIG. The method of dividing the cover may be changed.

  The third cover 180 and the fourth cover 190 shown in FIG. 17 cover the motor body 77a of the motor 77 from both sides in the radial direction. The third cover 180 has a semicircular surface portion 183 formed between the semicircular plane portions 181 and 189, and covers the upper half of the motor body 77a. The fourth cover 190 has a semicircular surface portion 193 formed between the semicircular plane portions 191 and 199, and covers the lower half of the motor body 77a. The outer peripheral surface of the motor body 77 a is covered with the half peripheral surface portion 183 of the third cover 180 and the half peripheral surface portion 193 of the fourth cover 190. The half peripheral surface portion 183 of the third cover 180 and the half peripheral surface portion 193 of the fourth cover 190 overlap each other in the installed state shown in FIG. An end 77f of the motor main body 77a on the side where the rotation shaft 77b protrudes is covered with the flat portion 181 of the third cover 180 and the flat portion 191 of the fourth cover 190. The opposite end 77g of the motor body 77a is covered with the flat portion 189 of the third cover 180 and the flat portion 199 of the fourth cover 190.

  Even when the third cover 180 and the fourth cover 190 shown in FIGS. 17 and 18 are employed, the same effects as those of the third embodiment described above can be obtained, and the motor 77 is ignited. In addition, the spread of fire around the motor 77 is suppressed.

  Moreover, in said 3rd Embodiment, although the cover divided | segmented into the 1st cover 80 and the 2nd cover 90 is employ | adopted, you may employ | adopt the cover divided | segmented into three or more members.

DESCRIPTION OF SYMBOLS 10 Indoor unit of air conditioning apparatus 12 Casing 12a Top plate (motor support part)
DESCRIPTION OF SYMBOLS 14 Centrifugal fan 17 Motor 17a Motor main body 17ae The outer edge of the motor main body 17b in the direction of extension of the motor rotation shaft 17b Motor rotation shaft 17c Motor leg portion 17d Connector portion (first portion)
17d1 One end of the connector part 17d2 The other end of the connector part 17e Electric wire of the motor 17f1 Step surface of the motor body (end part of the motor body in the direction in which the rotation shaft extends)
17f2 Step surface of the motor body (end of the motor body in the direction in which the rotation shaft extends)
30 Cover 33a Notch of cover 40 Indoor unit of air conditioner 42 Casing 42a Motor mounting plate (motor support part)
44 multiblade fan 47 motor 47a motor main body 47b motor rotation shaft 47c motor leg 47f annular surface (end of the motor main body in the direction in which the rotation shaft extends)
60 Cover 63a Notch of cover 70 Indoor unit of air conditioner 72 Casing 74 Cross flow fan 77 Motor 77a Motor body 77b Motor rotating shaft 77f End of the motor body rotating shaft on the protruding side 77g Motor rotating shaft End of the opposite side of the projecting side 80 Cover 90 Cover 130 Cover 133a Cover cutout 170 Motor 180 Cover 190 Cover 230 Cover 233a Cover cutout G1, G2, G3,... From the cover to the outer peripheral surface of the motor body Distance O Center of rotation axis

JP-A-11-44433

Claims (10)

A casing (12, 42, 72);
A fan (14, 44, 74) disposed in the casing;
A motor (17, 47) having a cylindrical motor body (17a, 47a, 77a) and a rotation shaft (17b, 47b, 77b) protruding from the motor body and fixed to the fan, and rotating the fan. , 77, 170)
A flame retardant cover (30, 60, 80, 90, 130, 230) that covers at least 70% or more of the outer peripheral surface of the motor body;
With
The average value of the distances (G1, G2, G3,...) From the cover to the outer peripheral surface of the motor body is the center of the rotation shaft at the outer edge (17ae) of the motor body in the direction of the rotation shaft extension. The cover is formed to be smaller than the maximum value (R) of the distance from (O).
Indoor unit (10, 40, 70) of air conditioner. The motor (17, 47) further includes legs (17c, 47c) protruding from the motor body,
The leg is fixed to a motor support (12a, 42a) which is a part of the casing or a member attached to the casing.
The cover further covers a side of the leg opposite to the motor body;
The indoor unit of the air conditioning apparatus of Claim 1. The motor (17) further includes an electric wire (17e) protruding from the first part (17d) of the motor body,
The cover (30, 60, 130, 230) is formed with an opening or a notch (33a, 63a, 133a, 233a) for passing the wire.
The indoor unit of the air conditioning apparatus of Claim 1 or 2. The first straight line (L1) connecting the center (O) of the rotating shaft and one end (17d1) of the first portion, as viewed in the direction in which the rotating shaft extends, and the center of the rotating shaft and the other of the first portion The motor body so that the opening or the notch (133a) formed in the cover (130) is removed from the region (S) surrounded by the second straight line (L2) connecting the end (17d2). The cover (130) is arranged against
The indoor unit of the air conditioning apparatus of Claim 3. The cover is disposed with respect to the motor body such that gaps (G1, G2, G3,...) Are opened between the cover and the motor.
The indoor unit of the air conditioning apparatus in any one of Claim 1 to 4. The motor further includes a leg portion (170c) fixed to a motor support portion (12a) which is a part of the casing or a member attached to the casing,
The cover (230) is formed with an opening or a notch (233b) for passing the leg.
The indoor unit of the air conditioning apparatus of Claim 1. The cover (230) is fixed to the motor (170).
The indoor unit of the air conditioning apparatus of Claim 6. The cover further partially covers end portions (17f1, 17f2, 47f, 77f, 77g) of the motor body in a direction in which the rotation shaft extends.
The indoor unit of the air conditioning apparatus in any one of Claim 1 to 7. The cover is divided into two or more members including a first member (80, 180) and a second member (90, 190),
The first member and the second member partially overlap in a state of covering the motor body.
The indoor unit of the air conditioning apparatus in any one of Claim 1 to 8. The cover is disposed with respect to the motor body such that a gap is left between the cover and the fan.
The indoor unit of the air conditioning apparatus in any one of Claim 1 to 9.

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