JP6978664B2 - Indoor unit of air conditioner - Google Patents

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, the ceiling-embedded indoor unit shown in Patent Document 1 (Japanese Unexamined Patent Publication No. 11-444333) employs a turbofan. In this indoor unit, a motor is attached to the top plate of the cabinet (casing), and the motor rotates the turbofan. The cabinet is composed of a case made of 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 turbofan and the motor are covered with a case made of steel plate.

As described above, if the fan or motor is covered with a steel plate in the indoor unit, the steel plate can suppress the spread of fire to the periphery of the indoor unit even when the fire spreads into the indoor unit due to ignition in the room.

However, if the indoor unit is not installed properly, or if the power supply to the indoor unit is mistakenly connected with an inappropriate voltage, the motor of the indoor unit may be installed. It can be a source of ignition. Therefore, even if a fire occurs inside the motor, it is preferable to take measures to prevent the fire from spreading around the motor. Further, if a fire breaks out indoors, it is preferable to be able to investigate whether the cause of the fire was the motor of the indoor unit or the cause of the fire outside the indoor unit.

An object of the present invention is to provide an indoor unit of an air conditioner capable of suppressing the spread of fire even if the motor ignites.

The indoor unit of the air conditioner according to the first aspect of the present invention includes a casing, a fan, a motor for rotating the fan, and a cover. The fan is placed inside the casing. The motor has a cylindrical motor body and a rotating shaft that protrudes from the motor body and is fixed to a fan. The cover is a flame-retardant cover that covers the motor body. The cover covers at least 70% of the outside of the outer peripheral surface of the motor body. Then, the cover is provided 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 in the direction view in which the rotation axis of the motor extends. It is formed.

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

Further, 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 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. Therefore, even if the motor ignites, it is easy to extinguish the fire in the space from the cover to the outer peripheral surface of the motor body, and the spread of fire to the periphery of the motor can be suppressed.

The indoor unit of the air conditioner according to the second aspect of the present invention is the indoor unit according to the first aspect, and the motor further has legs protruding from the motor body. The legs are fixed to the motor support. 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 opposite to the side of the motor body.

Here, a cover that covers the outside of the outer peripheral surface of the motor body by at least 70% or more also covers the legs protruding from the motor body. As a result, it is possible to prevent a gap between the outer peripheral surface of the motor body and the outside of the motor from being generated around the legs. Therefore, even if the motor ignites, the spread of fire can be suppressed more reliably.

The indoor unit of the air conditioner according to the third aspect of the present invention is the indoor unit according to the first or second aspect, and the motor further has an electric wire protruding from the first portion of the motor body. The cover is formed with an opening or notch for passing an electric wire.

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

The indoor unit of the air conditioner according to the fourth aspect of the present invention is the indoor unit according to the third aspect, and is the center of the rotation axis and one end of the first part of the motor body in the direction in which the rotation axis of the motor extends. The opening or notch formed in the cover is removed from the area surrounded by the first straight line connecting the two and the second straight line connecting the center of the rotating shaft and the other end of the first portion of the motor body. A cover is placed with respect to the motor body.

If abnormal heat generation occurs inside the motor body and ignites inside the motor body, there is a high possibility that the fire will jump out from the first part of the motor body, which is the part where the electric wire protrudes.

In view of this, here, the opening or notch formed in the cover is removed from the predetermined area to prevent the fire from jumping out to the outside of the cover even if a fire occurs in the motor body. There is.

The indoor unit of the air conditioner according to the fifth aspect of the present invention is the indoor unit according to any one of the first to fourth aspects, with respect to the motor body so as to leave a gap between the cover and the motor. The cover is placed.

Here, since the cover and the motor are not brought into close contact with each other and the cover is arranged so that there is a gap between them, 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. The price can be lowered.

The indoor unit of the air conditioner according to the sixth aspect of the present invention is the indoor unit according to the first aspect, and the motor further has 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. The cover is formed with an opening or a notch for passing the leg portion of the motor.

Here, the motor has legs, but if the legs are large, the cover will be large if a structure in which the motor including the legs is covered with a cover is adopted. Therefore, an opening or a notch for passing the leg is formed in the cover to reduce the size of the cover.

The indoor unit of the air conditioner according to the seventh aspect of the present invention is the indoor unit according to the sixth aspect, and the cover is fixed to the motor.

When the structure is adopted in which the legs are exposed to the outside of the cover through the opening or notch formed in the cover, the cover can be brought close to the motor body. In view of this, here, by fixing the cover to the motor and fixing a part of the legs protruding outside the cover to the motor support portion, both the motor and the cover are supported by the motor support portion. There is. By integrating the motor and the cover, it is possible to suppress problems such as rubbing noise due to motor vibration between them.

The indoor unit of the air conditioner according to the eighth aspect of the present invention is the indoor unit according to any one of the first to seventh aspects, and the cover further covers the end portion of the motor body in the extending direction of the rotation shaft. Partially cover.

Here, the cover covers the outside of the outer peripheral surface of the motor body by at least 70% or more, and partially covers the end portion of the motor body in the extending direction of the rotation axis. As a result, even if the motor ignites, it is further suppressed that the fire spreads around the motor.

The indoor unit of the air conditioner 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 is formed on two or more members including the first member and the second member. It is divided. Then, the first member and the second member partially overlap each other in a state of covering the motor main body.

Here, by adopting a cover having a split structure, the time required for the process of covering the motor body with the cover in the assembly work of the indoor unit is shortened. Further, since the first member and the second member partially overlap each other while covering the motor body, even if the motor ignites, it is possible to prevent the fire from coming out of the cover.

The indoor unit of the air conditioner according to the tenth aspect of the present invention is the indoor unit according to any one of the first to ninth aspects, with respect to the motor body so as to leave a gap between the cover and the fan. The cover is placed.

Here, by securing a gap between the rotating fan and the non-rotating cover, it is possible to suppress a problem that noise is generated due to contact between the two.

In the indoor unit of the air conditioner according to the first aspect of the present invention, the cover arranged on the outside of the outer peripheral surface of the motor body covers at least 70% or more of the outer peripheral surface of the motor body, so that the motor tentatively ignites. Even if this is the 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 in the direction in which the rotation axis of the motor extends. Even if the fire ignites, it is easy to extinguish 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, it is suppressed that a gap connecting the outer peripheral surface of the motor body and the outside of the motor is generated around the legs, and if the motor ignites. In addition, the spread of fire can be suppressed more reliably.

In the indoor unit of the air conditioner 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 conditioner according to the fourth aspect of the present invention, even if a fire occurs inside the motor body, it is possible to suppress the fire from jumping out to the outside of the cover.

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 conditioner according to the sixth aspect of the present invention, the cover can be miniaturized.

In the indoor unit of the air conditioner according to the seventh aspect of the present invention, it is possible to suppress a defect such as a rubbing noise due to motor vibration between the motor and the cover.

In the indoor unit of the air conditioner according to the eighth aspect of the present invention, even if the motor ignites, the fire is further suppressed from spreading around the motor.

In the indoor unit of the air conditioner according to the ninth aspect of the present invention, by adopting the cover having the divided structure, the time required for the step of covering the motor body with the cover in the assembly work of the indoor unit is shortened.

In the indoor unit of the air conditioner according to the tenth aspect of the present invention, by securing a gap between the rotating fan and the non-rotating cover, it is possible to suppress a problem that noise is generated due to contact between the two.

The external perspective view of the indoor unit which concerns on 1st Embodiment of the prior art and this invention. Vertical sectional view of a conventional indoor unit. An exploded perspective view of a centrifugal fan, a motor, and a cover of an indoor unit according to the first embodiment. The vertical sectional view of the centrifugal fan, the motor and the cover of the indoor unit which concerns on 1st Embodiment. The explanatory view of the clearance dimension of the motor and the cover of the indoor unit which concerns on 1st Embodiment. The plan view of the cover of the room unit which concerns on 1st Embodiment. The plan view of the cover of the room unit which concerns on modification 1A of 1st Embodiment. The external perspective view of the cover of the room unit which concerns on modification 1B of 1st Embodiment. FIG. 3 is a vertical sectional view of a centrifugal fan, a motor, and a cover of an indoor unit according to a modification 1B of the first embodiment. The external perspective view of the room unit which concerns on 2nd Embodiment of this invention. An exploded perspective view of a multi-blade fan, a motor, and a cover of an indoor unit according to a second embodiment. The vertical sectional view of the multi-blade fan, the motor and the cover of the indoor unit which concerns on 2nd Embodiment. The external perspective view of the indoor unit which concerns on 3rd Embodiment of this invention. The vertical sectional view of the indoor unit which concerns on 3rd Embodiment. An exploded perspective view of a motor, a cover, and peripheral parts of an indoor unit according to a third embodiment. The vertical sectional view around the motor of the indoor unit which concerns on 3rd Embodiment. A partially enlarged view of FIG. An exploded perspective view of a motor, a cover, and peripheral parts of an indoor unit according to a modified example of the third embodiment. The vertical sectional view around the motor of the indoor unit which concerns on the modification of 3rd Embodiment.

<Conventional form>
FIG. 1 shows an external perspective view of the indoor unit 10 of the conventional air conditioner. Here, the indoor unit 10 is a ceiling-mounted unit, and mainly has a casing 12 for accommodating various constituent devices inside, and a decorative panel 13 arranged under the casing 12.

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

Inside the casing 12, mainly, 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 out toward the outer periphery, a heat exchanger 15 that surrounds the outer periphery of the centrifugal fan 14, and suction. A bell mouth 16 for guiding the air sucked from the mouth 13a to the centrifugal fan 14 is arranged. The centrifugal fan 14 is connected to a rotation shaft 17b of a motor 17 fixed to substantially the center of the top plate 12a of the casing 12, and is rotationally driven by the motor 17.

The centrifugal fan 14 is made of resin, and mainly has a disk-shaped main plate 21 connected to the motor 17, and a plurality of annularly arranged on the anti-fan motor 17 side of the main plate 21 around the rotation axis O 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 in the central portion thereof so that a hub portion 21a having a substantially truncated cone shape protrudes toward the suction port 13a, and the outer peripheral portion thereof is on the fan motor 17 side of a plurality of blades 22. Tie the ends of the. 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 tilted backward with respect to the rotation direction of the centrifugal fan 14.

<First Embodiment for practicing the present invention>
(1) Basic Configuration of Indoor Unit of Air Conditioner In the indoor unit of the air conditioner according to the embodiment of the present invention, a cover covering the motor 17 is further attached to the indoor unit 10 of the conventional air conditioner. It is a unit.

(2) Detailed configuration of the motor and the cover covering the motor (2-1) The motor 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. It has three leg portions 17c protruding 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 arranged 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 on which the rotating shaft 17b protrudes. An electric wire 17e connected to the built-in substrate extends outward from the connector portion 17d protruding radially outward from the outer peripheral surface of the motor main body 17a.

As shown in FIG. 4A, the three legs 17c have a shape for holding the anti-vibration rubber 18, and each of the three legs 17c is fastened to the top plate 12a (see FIG. 2) of the casing 12 while holding the anti-vibration rubber 18. Ru. Specifically, the motor 17 is fixed to the top plate 12a by the anti-vibration rubber 18 and the bolt 19 penetrating 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 can also be used.

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

Further, the cover 30 also partially covers the protruding end of the rotating shaft 17b of the motor body 17a. As shown in FIGS. 3 and 4A, the annular stepped surface 17f1, 17f2, 17f3 exists in the protruding portion of the rotating shaft 17b, of which the stepped surface 17f1, 17f2 is the annular flat surface portion of the cover 30. Covered by 31.

The cover 30 extends parallel to the rotating shaft 17b from the annular flat surface portion 31 having a hole through which the rotating shaft 17b passes in the center, the annular inclined surface portion 32 extending from the peripheral edge of the annular flat surface portion 31, and the end of the annular inclined surface portion 32. It has a tubular portion 33 and a plurality of fixing tabs 34 protruding outward in the radial direction from the tubular portion 33. The angle of inclination of the annular inclined surface portion 32 is equal to the angle of inclination of the hub portion 21a of the centrifugal fan 14, as shown in FIG. 4A. The annular inclined surface portion 32 and the tubular portion 33 cover the outside of the outer peripheral surface of the motor body 17a. The tubular portion 33 also covers the outside of the three leg portions 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 a vibration-proof sheet (not shown).

As shown in FIG. 4A, in a state where 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 is provided. A gap is also secured between the main plate 21 of the centrifugal fan 14 and the main plate 21 of the centrifugal fan 14.

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 body 17a has different dimensions (for example, the distances G1, G2, G3, ... G10 shown in FIG. 4B) in each part of the cover 30. .. Here, the average value of the distances (G1, G2, G3, ... G10) to the outer peripheral surface of the motor body 17a in each part of the cover 30 is the average value of the motor body 17a in the direction in which the rotation 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 rotation shaft 17b of the outer edge 17ae (see FIGS. 4B and 5). In this embodiment, since the shape of the motor body 17a is cylindrical, the maximum value R of the distance from the center O of the rotation shaft 17b of the outer edge 17a of the motor body 17a coincides with the radius of the motor body 17a. If a polygonal tubular motor body is adopted, the maximum value of the distance from the center of the rotating shaft of the outer edge of the motor body is the distance from the rotating shaft to the top of the outer edge of the tubular motor body.

As described above, the cover 30 is formed with a notch 33a for passing the electric wire 17e of the motor 17. Specifically, a notch 33a is formed in the tubular portion 33 of the cover 30 at a position slightly deviated from the center of the portion of the cylinder portion 33 facing the connector portion 17d of the motor 17, as shown in FIGS. 3 and 5. .. 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 that state.

(3) Features (3-1)
In the indoor unit 10 of the air conditioner according to the first embodiment, the cover 30 arranged on the outside of 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 the fire 17 ignites internally, the fire is suppressed from spreading around the motor 17.

Further, the distance from the cover 30 to the outer peripheral surface of the motor body 17a (G1) is larger than the maximum value R of the distance from the center 0 of the rotation shaft 17b of the outer edge 17ae of the motor body 17a in the direction in which the rotation shaft 17b of the motor 17 extends. , G2, G3, ... G10) are smaller. That is, the volume of the space from the cover 30 to the outer peripheral surface of the motor body 17a is small. Therefore, even if the motor 17 ignites, it is easy to extinguish the fire in the space from the cover 30 to the outer peripheral surface of the motor body 17a, and the spread of fire to the periphery of the motor 17 can be suppressed.

Further, if a fire breaks out indoors, it becomes easier to investigate whether the cause of the fire was the motor 17 of the indoor unit 10 or the cause of the fire outside the indoor unit 10.

(3-2)
In the indoor unit 10 of the air conditioner according to the first embodiment, the cover 30 that covers at least 70% or more of the outside of the outer peripheral surface of the motor body 17a also covers the plurality of legs 17c protruding from the motor body 17a. .. This suppresses the formation of a gap around the leg portion 17c that connects the outer peripheral surface of the motor body 17a and the outside of the motor 17. Therefore, even if the motor 17 ignites, the spread of fire can be suppressed more reliably.

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

(3-4)
In the indoor unit 10 of the air conditioner 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 arranged so that there is a gap between them, so that the heat dissipation of the motor 17 is improved. It will be secured. When adopting a structure in which the cover 30 and the motor 17 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, 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 conditioner according to the first embodiment, the cover 30 covers at least 70% or more of the outside of the outer peripheral surface of the motor body 17a, and the end portion of the motor body 17a in the extending direction of the rotation shaft 17b is covered. , Partially covered by the annular flat surface portion 31 of the cover 30. As a result, even if the motor 17 ignites, it is further suppressed that the fire spreads around the motor 17.

(4) Modification example (4-1) Modification example 1A
In the first embodiment described above, as shown in FIG. 5, the notch 33a is formed at a position slightly deviated from the center of the portion of the cylinder portion 33 of the cover 30 facing the connector portion 17d of the motor 17. There is. As a result, even if a fire is ignited inside the motor 17 and the fire is ejected from the connector portion 17d, the fire is suppressed from coming out from the notch 33a.

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

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

The notch 133a of the cover 130 is formed at a position completely removed from the portion of the cylinder portion 133 of the cover 130 (corresponding to the cylinder portion 33) facing the connector portion 17d of the motor 17. Specifically, in a directional view (viewpoint in FIG. 6) in which the rotation shaft 17b of the motor 17 extends, a first straight line L1 connecting the center O of the rotation shaft 17b and one end 17d1 of the connector portion 17d of the motor body 17a and rotation. The motor body 17a is formed so 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 with respect to the cover 130.

If the cover 130 is configured and arranged in this way, even if the coil abnormally generates heat inside the motor body 17a and ignites inside the motor 17, and the fire rushes out from the connector portion 17d, it will be on the outside of the cover 130. The fire almost never pops out.

(4-2) Modification 1B
In the first embodiment described above, the cover 30 that covers at least 70% or more of the outside of the outer peripheral surface of the motor body 17a also covers the plurality of legs 17c protruding from the motor body 17a. Alternatively, 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, can be adopted.

As shown in FIG. 7, the cover 230 has an annular flat surface portion 231 having a hole for passing the rotation shaft 170b of the motor 170 in the center, an annular inclined surface portion 232 extending from the peripheral edge of the annular flat surface portion 231 and an annular inclined surface portion 232. It has a cylinder portion 233 extending parallel to the rotation shaft 170b from the end of the cylinder portion 233, and a plurality of fixing tabs 234 protruding outward in the radial direction from the cylinder portion 233. The annular inclined surface portion 232 and the tubular portion 233 cover the outside of the outer peripheral surface of the motor body 170a. The tubular portion 233 is formed with a notch 233b for avoiding interference with the three leg portions 170c. Further, another notch 233a for passing the electric wire of the motor 170 is also formed in the tubular portion 233.

Further, apart from the cover 230, a lid 239 facing the end surface on the side opposite to the side on which the rotation shaft 170b of the motor 170 protrudes is prepared, and the lid 239 covers the motor 170 together with the cover 230. The lid 239 has a disk 239a and three tabs 239b protruding radially outward from the disk 239a via a stepped portion. The cover 230 is attached to the motor 170 from the rotation shaft 170b side, the lid 239 is covered from the opposite side, and the fixing tab 234 of the cover 230 and the tab 239b of the lid 239 are fastened so that the cover 230 and the lid 239 become the motor 170. Is integrated with. It is preferable to sandwich a disk-shaped elastic member (sponge, rubber, etc.) 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 anti-vibration rubber 18. In this state, the leg portion 170c of the motor 170 protrudes radially outward from the notch 233b of the tubular portion 233 of the cover 230. However, except for the notches 233a and 233b, the cover 230 generally covers the motor 170.

If the cover 230 as described above is adopted, the size of the cover 230 can be reduced. Further, as shown in FIG. 8, the gap between the motor 170 and the cover 230 becomes smaller, and even if the motor 170 ignites, it becomes easier to extinguish 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 by using the lid 239, and a part of the leg portion 170c protruding outside the cover 230 is fixed to the casing of the indoor unit to fix the motor 170 and the motor 170. Both covers 230 are supported by the casing. By integrating the motor 170 and the cover 230, it is possible to suppress problems such as rubbing noise due to motor vibration between them.

The main plate 21 of the centrifugal fan 14 shown by the alternate long and short dash line in FIG. 8 does not come into contact with the cover 230 even when an impact is applied when the indoor unit is transported or dropped, and the top of the casing of the indoor unit is not contacted. It shows that it hits the plate 12a.

(4-3) Modification 1C
In the first embodiment described above, the cover 30 is formed with a 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 Conditioning Device FIG. 9 shows the appearance of the 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 indoor 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 upper part. Blow out into the room from the exits 46a and 46b. The motor mounting plate 42a 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, along with a heat exchanger and the like, a multi-blade fan 44 shown in FIG. 10, a motor 47 for turning the multi-blade fan 44, a cover 60 for covering the motor 47, and the like are arranged.

(2) Detailed configuration of the motor and the cover covering the motor (2-1) The motor 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. It has a leg portion 47c that projects radially outward from the outer peripheral surface of the 47a.

As shown in FIG. 11, a multi-blade 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 on which the rotating shaft 47b protrudes. As shown in FIG. 11, the leg portion 47c is fixed to the motor holding frame 49. The motor holding frame 49 is bolted to the motor mounting plate 42a described above.

(2-2) Cover The flame-retardant cover 60 is a member that covers at least 70% or more of the outside of the outer peripheral surface of the motor body 47a. Both the outside of the leg portion 47c protruding from the outer peripheral surface of the motor body 47a and the outside of the motor holding frame 49 are covered with the cover 60 (see FIG. 11). As a result, a state in which the outside of the outer peripheral surface of the motor main body 47a is almost covered is realized except for the portion of the notch 63a for passing the electric wire of the motor 47.

Further, the cover 60 also partially covers the protruding end of the rotating shaft 47b of the motor body 47a. As shown in FIGS. 10 and 11, an annular surface 47f exists in the protruding portion of the rotating shaft 47b, but is covered by the annular flat surface portion 61 of the cover 60.

The cover 60 extends parallel to the rotating shaft 47b from the annular flat surface portion 61 having a hole for passing the rotating shaft 47b in the center, the annular inclined surface portion 62 extending from the peripheral edge of the annular flat surface portion 61, and the end of the annular inclined surface portion 62. It has a tubular portion 63 and a flange 64 extending radially outward from the tubular portion 63. The annular inclined surface portion 62 and the tubular portion 63 cover the outside of the outer peripheral surface of the motor body 47a. The flange 64 of the cover 60 is fixed to the motor mounting plate 42a provided on the casing 42 by bolts 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, and the cover 60 and the cover 60 are many. A gap is also secured between the wing fan 44 and the wing fan 44.

The shape of the cover 60 is determined so that the gap between the outer peripheral surface of the motor 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 body 67a is a different dimension in each part of the cover 60. Here, the average value of the distances to the outer peripheral surfaces of the motor 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 body 47a in 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 arranged on the outside of 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 the 47 ignites internally, it is suppressed that the fire spreads around the motor 47.

Further, the average value of the distance from the cover 60 to the outer peripheral surface of the motor 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 body 47a in the direction in which the rotation shaft 47b of the motor 47 extends. It's getting smaller. That is, the volume of the space from the cover 60 to the outer peripheral surface of the motor body 47a is small. Therefore, even if the motor 47 ignites, it is easy to extinguish the fire in the space from the cover 60 to the outer peripheral surface of the motor body 47a, and the spread of fire to the periphery of the motor 47 can be suppressed.

(3-2)
In the indoor unit 40 of the air conditioner according to the second embodiment, the cover 60 that covers at least 70% or more of the outside of the outer peripheral surface of the motor body 47a also covers the legs 47c protruding from the motor body 47a. This suppresses the formation of a gap around the leg portion 47c that connects the outer peripheral surface of the motor body 47a and the outside of the motor 47. Therefore, even if the motor 47 ignites, the spread of fire can be suppressed more reliably.

(3-3)
In the indoor unit 40 of the air conditioner 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 arranged so that there is a gap between them, so that the heat dissipation of the motor 47 is improved. It will be 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 outside of the outer peripheral surface of the motor body 47a, and the end portion of the motor body 47a in the extending direction of the rotation shaft 47b is covered. , Partially covered by the annular flat surface portion 61 of the cover 60. As a result, 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 Conditioning Device FIG. 12 shows the appearance of the wall-mounted indoor unit 70 according to the third embodiment of the present invention. As shown in FIG. 13, the indoor unit 70 of this 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 side plates, 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. The cross flow fan 74 is located below the heat exchanger 73 having an inverted V shape. The cross-flow fan 74 applies the air taken in from the room to the heat exchanger 73 to pass through it, and blows it into the room from below.

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

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

(2-2) Cover As shown in FIG. 14, the stainless steel cover is divided into a first cover 80 and a second cover 90. These covers 80 and 90 are put on the motor 77 from the front and back in the direction of the rotation shaft 77b of the motor 77. In the installation state shown in FIG. 15, the pair of covers 80, 90 covers at least 70% or more of the outside of the outer peripheral surface of the motor body 77a. Here, a state in which the outside of the outer peripheral surface of the motor body 77a is almost covered is realized.

Further, the pair of covers 80 and 90 partially covers both the protruding end portion 77f of the rotating shaft 77b of the motor body 77a and the opposite end portion 77g.

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

The second cover 90 has an annular flat surface portion 91 and a tubular 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 body 77a.

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

As shown in FIG. 15, the motor 77 with both covers 80 and 90 covered is mounted on the resin 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, above the motor 77 covered with both covers 80 and 90, front and rear drain pan connecting members 79 for connecting the ends of the drain pans 75 and 76 described above are arranged. The front and rear drain pan connecting members 79 are formed with a drain passage 79a (see FIG. 15) for flowing water 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 on the outside of 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 the motor 77, even if the motor 77 ignites inside, the fire is suppressed from spreading around the motor 77.

Further, the average distance from both covers 80 and 90 to the outer peripheral surface of the motor body 77a is larger than the maximum value of the distance from the center of the outer edge of the motor body 77a in the direction in which the rotation 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 body 77a is very small. Therefore, even if the motor 77 ignites, the spread of fire to the periphery of the motor 77 can be suppressed.

Further, if a fire breaks out indoors, it becomes easier to investigate whether the cause of the fire was the motor 77 of the indoor unit 70 or the cause of the fire outside the indoor unit 70.

(3-2)
In the indoor unit 70 of the air conditioner according to the third embodiment, the cover covering the motor 77 is divided into a first cover 80 and a second cover 90. Then, as shown in FIG. 16, the first cover 80 and the second cover 90 partially overlap each other in a state of covering the motor main body 77a.

Here, since the cover having the divided structure is adopted, the time required for the step of covering the motor main body 77a in the assembly work of the indoor unit 70 is shortened. Further, since the first cover 80 and the second cover 90 partially overlap each other while covering the motor body 77a, even if the motor 77 ignites, there is almost no possibility that the fire will go out of the cover.

(4) Modification Example In the above-mentioned third embodiment, the first cover 80 and the second cover 90 that cover the motor 77 from the front and back in the direction of the rotation shaft 77b of the motor 77 are adopted, but as shown in FIG. You may change the way the cover is divided.

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. In the third cover 180, a semicircular surface portion 183 is formed between the semicircular flat surface portions 181, 189, and covers the upper half of the motor main body 77a. In the fourth cover 190, a semicircular surface portion 193 is formed between the semicircular flat surface portions 191, 199, and covers the lower half of the motor main body 77a. The outer peripheral surface of the motor body 77a is covered by the half peripheral surface portion 183 of the third cover 180 and the half peripheral surface portion 193 of the fourth cover 190. The ends of 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. The protruding end 77f of the rotating shaft 77b of the motor body 77a is covered by the flat surface portion 181 of the third cover 180 and the flat surface portion 191 of the fourth cover 190. The opposite end 77g of the motor body 77a is covered by the flat surface portion 189 of the third cover 180 and the flat surface 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 adopted, the same operation and effect as those of the above-mentioned third embodiment can be obtained, and if the motor 77 ignites. In addition, the spread of fire to the periphery of the motor 77 is suppressed.

Further, in the above-mentioned third embodiment, the cover divided into the first cover 80 and the second cover 90 is adopted, but the cover divided into three or more members may be adopted.

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

Japanese Unexamined Patent Publication No. 11-444333

Claims (10)

Casing (12,42,72) and
A heat exchanger arranged in the casing and
A fan (14,44,74) arranged in the casing and taking in air passing through the heat exchanger,
A motor (17,47) having a cylindrical motor body (17a, 47a, 77a) and a rotating shaft (17b, 47b, 77b) protruding from the motor body and fixed to the fan to rotate the fan. , 77, 170),
A flame-retardant cover (30, 60, 80, 90, 130, 230) that covers at least 70% or more of the outside of the outer peripheral surface of the motor body.
Equipped 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 axis of the outer edge (17ae) of the motor body in the direction in which the rotation axis extends. The cover is formed so as to be smaller than the maximum value (R) of the distance from (O).
Indoor unit of air conditioner (10, 40, 70). The motor (17,47) further has legs (17c, 47c) protruding from the motor body.
The legs are fixed to a part of the casing or a motor support portion (12a, 42a) which is a member attached to the casing.
The cover further covers the side of the leg opposite to the side of the motor body.
The indoor unit of the air conditioner according to claim 1. The motor (17) further has an electric wire (17e) protruding from the first portion (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 electric wire.
The indoor unit of the air conditioner according to claim 1 or 2. In the direction in which the rotation axis extends, the first straight line (L1) connecting the center (O) of the rotation axis and one end (17d1) of the first portion, the center of the rotation axis, 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 ends (17d2). The cover (130) is arranged with respect to the above.
The indoor unit of the air conditioner according to claim 3. The cover is arranged with respect to the motor body so that a gap (G1, G2, G3, ...) Is provided between the cover and the motor.
The indoor unit of the air conditioner according to any one of claims 1 to 4. The motor further comprises a leg (170c) that is fixed to a portion of the casing or a motor support (12a) that is a member attached to the casing.
The cover (230) is formed with an opening or a notch (233b) for passing the leg portion.
The indoor unit of the air conditioner according to claim 1. The cover (230) is fixed to the motor (170).
The indoor unit of the air conditioner according to claim 6. The cover further partially covers the end of the motor body in the extending direction of the rotating shaft (17f1,17f2,47f,77f,77g).
The indoor unit of the air conditioner according to any one of claims 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 each other in a state of covering the motor body.
The indoor unit of the air conditioner according to claim 1. The cover is arranged with respect to the motor body so that there is a gap between the cover and the fan.
The indoor unit of the air conditioner according to claim 1 or 9.

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