air conditioning unit

Abstract

To improve safety by preventing spread of fire by flames, even in the case where a flame is formed in an electric wiring part of a motor case in an unexpected abnormal state.SOLUTION: On an outer peripheral surface 84 of a motor case 82, an electric wiring part 85 where an electric wire L is extended is provided. A motor cover 2 is constituted by: a first support part 20 formed by a resin material; and a second support part 50 formed by a more highly flame-retardant material than the first support part 20. At a place opposing to the electric wiring part 85 of the second support part 50, a recess part 62 is provided which is dented outwardly and separated in the radial direction, and the electric wire L is drawn out from a draw-out part 70 provided at a position separated from the recess part 62 in the circumferential direction.SELECTED DRAWING: Figure 7

Description

Technical Field

[0001] The present invention relates to an air conditioner.

Background Art

[0002] An air conditioner such as a bathroom heater-dryer includes, in an outer casing, a heat exchanger, a blower fan, and a motor that rotates the blower fan. In this type of air conditioner, it is necessary to prevent the spread of fire caused by ignition resulting from unexpected abnormal conditions. For example, in Patent Document 1, in order to cope with ignition caused by a short circuit of a circuit board in a motor case when water enters the inside of the motor case from an electrical wiring portion electrically connected to the circuit board in the motor case, it is proposed to accommodate a fire spread prevention cover made of flame-retardant resin that covers the electrical wiring portion in a bracket that supports the motor and is integrally resin-molded with a support wall portion that supports the blower fan.

[0003] However, as disclosed in Patent Document 1, accommodating the fire spread prevention cover in the bracket requires forming a large bracket. Component parts such as piping are also accommodated around the motor case in the outer casing, and there is only a narrow space, so the size of the bracket is also limited. Therefore, it is difficult to secure a large distance between the electrical wiring portion and the fire spread prevention cover, and when a flame is formed at the electrical wiring portion, the resin fire spread prevention cover is directly heated by the flame. Further, an electric wire extending from the electrical wiring portion is drawn out to the outside from the fire spread prevention cover. Therefore, if a lead-out portion that draws the electric wire out from the fire spread prevention cover is close to the electrical wiring portion, the flame propagates along the electric wire and leaks out of the fire spread prevention cover from the lead-out portion. As a result, there is a problem that surrounding parts catch fire and the fire spreads.

Prior Art Literature

Patent Literature

[0004]

Patent Document 1

Summary of the Invention

[0005] The present invention solves the above problems, and its objective is to improve safety by preventing the spread of fire even when flames are formed in the electrical wiring section of the motor case under unexpected abnormal conditions. [Means for solving the problem]

[0006] According to a first aspect of this technology, An air conditioning system comprising, within an outer casing, a heat exchanger through which a heat transfer medium flows, a blower fan that circulates air through the heat exchanger and supplies it to the room, a cylindrical motor case housing a motor that rotates the blower fan, and a motor cover that supports the motor case and covers the motor case, The motor case has an electrical wiring section on its outer surface, through which wires extend to electrically connect the circuit board inside the motor case to the object to be connected outside the motor cover. The motor cover comprises at least a first support portion made of a resin material and a second support portion made of a material with higher flame retardancy than the first support portion. The second support portion has a recess that is recessed outward at least at a location facing the electrical wiring portion of the motor case, and is spaced radially away from the electrical wiring portion of the motor case. The air conditioning device is provided in which the electric wires extending from the electrical wiring section are routed out to the outside of the motor cover from a recess in the second support section and a pull-out section of the motor cover located at a position circumferentially away from the motor case.

[0007] According to the first embodiment described above, the highly flame-retardant second support portion has a recess that is recessed outward at least at a location facing the electrical wiring portion of the motor case, and is spaced radially away from the electrical wiring portion of the motor case. Therefore, even if a flame forms on the electrical wiring portion, it is difficult for the flame to come into contact with the inner surface of the recess of the second support portion. Furthermore, the lead-out portion for leading the electric wires to the outside of the motor cover is located at a position circumferentially away from the recess of the second support portion and the motor case, so it is difficult for flames to leak from the lead-out portion to the outside of the motor cover. This makes it possible to suppress the spread of fire to surrounding parts and improve safety.

[0008] According to a second aspect of this technology, in the first embodiment described above, The distance between a certain area of ​​the wiring peripheral portion on the outer circumferential surface of the motor case, including the electrical wiring portion, and the inner surface of the recess of the second support portion facing the wiring peripheral portion in the radial direction of the motor case, is greater than the distance between the non-wiring peripheral portion on the outer circumferential surface of the motor case other than the wiring peripheral portion and the inner surface of the motor cover facing the non-wiring peripheral portion in the radial direction of the motor case.

[0009] According to the second embodiment described above, the gap between the motor case and the motor cover in the radial direction of the motor case widens around the wiring, so that the bent portion of the electric wire extending from the electrical wiring section toward the exit section can be accommodated in the gap. On the other hand, since the gap between the motor case and the motor cover in the radial direction of the motor case narrows around the non-wiring section, the overall size of the motor cover can be reduced. As a result, the motor cover can be housed in a compact space.

[0010] According to a third aspect of this technology, The motor case is arranged such that the motor shaft extends horizontally, and the electrical wiring section is positioned at a predetermined angle of inclination in the circumferential direction of the motor case, away from the top of the outer surface of the motor case in the vertical direction. The motor cover is positioned so that the pull-out section is located below the electrical wiring section. The wires extending from the electrical wiring section bend downwards from the electrical wiring section and are pulled out from the outlet to the outside of the motor cover. The bent portion of the electric wire does not come into contact with the inner surface of the recess in the second support portion.

[0011] If the electrical wiring section is facing vertically upward, condensation or water droplets can form inside the motor cover, making it easy for water to seep into the motor case from the electrical wiring section. However, according to the third embodiment described above, the electrical wiring section is located at a predetermined angle of inclination in the circumferential direction of the motor case from the top of the outer surface of the motor case in the vertical direction. Therefore, water adhering to the outer surface of the motor case flows downward, making it difficult for water to enter the motor case from the electrical wiring section. Furthermore, even if a flame forms in the electrical wiring section, the flame extends upward, making it difficult for the flame to leak out of the motor cover from the lower outlet through the wire that bends downward from the electrical wiring section. Moreover, since the bent portion of the wire does not come into contact with the inner surface of the recess of the second support section, the second support section is less likely to be directly heated by the flame. This further prevents the spread of fire.

[0012] According to a fourth aspect of this technology, The motor cover is constructed by connecting a first support section and a second support section, which are divided radially from the motor case. At the connection point facing the upper outer surface of the motor case, the tip of the first support part and the tip of the second support part are connected by a spigot joint. The first support portion and the second support portion are provided such that the connecting portion facing the upper outer surface of the motor case is positioned opposite the electrical wiring portion in the circumferential direction of the motor case with respect to a vertical line passing through the top of the outer surface of the motor case.

[0013] According to the fourth embodiment described above, even if water enters the motor cover from the connection between the first support and the second support, it is difficult for the water to flow towards the electrical wiring. This further prevents the spread of fire.

[0014] According to a fifth aspect of this technology, in the fourth aspect described above, The first support portion is a connecting portion facing the upper outer circumferential surface of the motor case, and has a stepped portion recessed radially outward from the motor case and a first connecting end face extending radially outward from the tip of the stepped portion. The second support portion includes, at the connection part facing the upper outer circumferential surface of the motor case, a protruding strip that protrudes toward the first support portion, and a second connection end surface that extends outward in the radial direction of the motor case from the base end of the protruding strip, The first support portion and the second support portion are connected at the connection part facing the upper outer circumferential surface of the motor case, wherein the protruding strip of the second support portion engages with the stepped portion of the first support portion from the inner side, and the first connection end surface of the first support portion and the second connection end surface of the second support portion are provided so as to be in surface contact with each other.

[0015] According to the fifth aspect, water outside the motor cover is less likely to intrude to the inner side of the connection part between the first support portion and the second support portion that faces the upper outer circumferential surface of the motor case. Furthermore, since the tip end of the protruding strip of the second support portion is further spaced apart from the electrical wiring portion in the circumferential direction of the motor case, even if water intrudes into the interior of the motor cover through the connection part, the water is less likely to flow toward the electrical wiring portion. This further enables fire spread to be prevented. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] [Figure 1] Fig. 1 is a schematic perspective view showing a bathroom heater dryer according to an embodiment of the present invention. [Figure 2] Fig. 2 is a schematic plan view of essential parts showing the bathroom heater dryer according to an embodiment of the present invention. [Figure 3] Fig. 3 is a schematic configuration diagram showing the bathroom heater dryer according to an embodiment of the present invention. [Figure 4] Fig. 4 is a schematic exploded perspective view of essential parts showing the bathroom heater dryer according to an embodiment of the present invention. [Figure 5] Fig. 5 is a schematic perspective view of essential parts showing the first motor accommodating portion of a motor cover according to an embodiment of the present invention. [Figure 6] Fig. 6 is a schematic perspective view of essential parts showing the second motor accommodating portion of a motor cover according to an embodiment of the present invention. [Figure 7] Fig. 7 is a schematic cross-sectional view of essential parts of the bathroom heater dryer according to an embodiment of the present invention. [Figure 8]FIG. 8 is a schematic enlarged cross-sectional view of essential parts of a bathroom heater-dryer according to an embodiment of the present invention. MODE FOR CARRYING OUT THE INVENTION

[0017] Hereinafter, an embodiment in which the air conditioner of the present invention is applied to a wall-mounted bathroom heater-dryer installed on a wall surface of a bathroom will be described. FIG. 1 is a schematic perspective view showing the bathroom heater-dryer according to the present embodiment, FIG. 2 is a schematic plan view of essential parts with some components such as a front cover of an outer casing omitted, and FIG. 3 is a schematic configuration diagram. An outer casing 100 of a bathroom heater-dryer 1 includes a main body casing 10 attached to a wall surface of a bathroom, and a front cover 11 covering a front surface of the main body casing 10. The main body casing 10 is formed in a horizontally elongated box shape open at a front surface thereof, and the front cover 11 is attached to a front opening portion. In the present specification, the front cover 11 side is defined as a front side, a depth direction when viewing the bathroom heater-dryer 1 from the front side is referred to as a front-rear direction, a width direction is referred to as a left-right direction, and a height direction is referred to as an up-down direction. These expressions representing directions and positions are used for convenience of description and do not limit the present disclosure. Further, with a motor shaft 81 of a motor 80 described later as a center, a direction along an outer circumferential surface of a motor case 82 is referred to as a circumferential direction, and a direction orthogonal to the motor shaft 81 is referred to as a radial direction.

[0018] The front cover 11 has a grid-shaped suction port 12 for sucking air in the bathroom on an upper surface thereof, and an air outlet 13 for blowing out warm air on a lower surface thereof. Although not shown, the air outlet 13 is provided with a louver for adjusting the wind direction of the warm air. Housed in the outer casing 100 are: an L-shaped heat exchanger 14 that performs heat exchange between hot water supplied from a heat source device (not shown) and air in the bathroom; a blower fan 15 that circulates air in the bathroom through the heat exchanger 14 and supplies heated warm air into the bathroom; the motor 80 that rotationally drives the blower fan 15; and a filter 17 provided between the front cover 11 and the heat exchanger 14. An operation display unit 19 provided at a lower left front portion of the main body casing 10 is exposed forward through a window hole provided in the front cover 11.

[0019] As shown in Figure 4, within the internal space of the main casing 10, a fan housing section 18, which is open to the front and recessed to the rear in a longitudinal arc shape, is integrally molded with the main casing 10 in the area where the blower fan 15 is housed. Fan shafts protrude from both ends of the blower fan 15. One fan shaft is directly connected to the motor shaft 81 of the motor 80, and the other fan shaft is supported by a bearing support portion of the main casing 10 via a bearing. Furthermore, to the left of the fan housing section 18, a first motor housing section 20 is integrally molded with the main casing 10 in resin, which is open to the front and has a recessed to the rear in a longitudinal arc shape, housing the rear part of the motor case 82. This first motor housing section 20 corresponds to the first support portion that constitutes the rear half of the motor cover 2. The first motor housing 20 may be formed as a separate part from the main casing 10, but by integrally molding a part of the motor cover 2 with the main casing 10 in resin, the entire device can be miniaturized.

[0020] As shown in Figures 4-5 and 7, the first motor housing 20 has a pair of semicircular first left side walls 22 and first right side walls 23 extending rearward from the left and right ends of the first opening 21, and an arc-shaped first circumferential wall 24 connecting the first left and right side walls 22 and 23. The first right side wall 23 has a semicircular first right notch 25 cut out to the rear.

[0021] On the inner surface of the first right side wall 23, there is a first right bearing support portion 26 which has a larger diameter than the first right notch portion 25 and is cut out in a semicircular shape towards the rear. On the inner surface of the first left side wall 22, there is a first left bearing support portion 27 which faces the first right bearing support portion 26. These first left and right bearing support portions 27 and 26 support the rear portion of the bearing portion 83 which protrudes outward from both sides of the motor case 82, which will be described later.

[0022] The first motor housing 20 has a first flange portion 28 extending outward from the opening end of the first opening 21. The first flange portion 28 extending downward from the lower end of the first opening 21 has a first lower notch portion 29 formed therein, which is cut out in a U-shape rearward to the front part of the lower end of the first circumferential wall 24. An engaging projection 59 that protrudes forward from the lower end of the second circumferential wall 54 of the second motor housing 50, which will be described later, is fitted into this first lower notch portion 29. In addition, the first motor housing 20 has a stepped portion 30 that is shallowly recessed rearward from the opening end of the first opening 21, except for the areas where the first right notch portion 25, the first right bearing support portion 26, and the first left bearing support portion 27 are formed (see Figures 5 and 7-8). A protruding ridge portion 60 that protrudes forward from the opening periphery of the second motor housing 50, which will be described later, is engaged with this stepped portion 30. The first flange portion 28 has a flat first connecting end face 31 that extends outward from the opening end of the first opening 21. The first flange portion 28 has a plurality of screw holes H1 for connecting the first motor housing portion 20 and the second motor housing portion 50.

[0023] As shown in Figures 4 and 6-7, a second motor housing 50 is assembled to the first motor housing 20 by fastening means such as screws S. The second motor housing 50 has a forward-facing recess in a longitudinal arc shape that opens to the rear and accommodates the front part of the motor case 82. This second motor housing 50 corresponds to the second support part that constitutes the front half of the motor cover 2. The second motor housing 50 is made of a more flame-retardant material than the main casing 10 (for example, ABS resin conforming to the UL94-5VA standard). However, the material of the second motor housing 50 is not limited as long as it is made of a more flame-retardant material than the resin of the first motor housing 20, and may be made of non-combustible resin or metal.

[0024] The second motor housing 50 has a pair of semicircular second left wall 53 and second right wall 52 extending forward from the left and right ends of the second opening 51, and an arc-shaped second circumferential wall 54 connecting the second left and right side walls 53 and 52. The second opening 51 is provided so as to face the first opening 21 in the front-rear direction. Therefore, by connecting the first motor housing 20 and the second motor housing 50, a motor cover 2 having a cylindrical internal space for housing the motor case 82 is formed. The second right wall 52 has a second right notch 55 that is cut out in a semicircular shape towards the front. Note that since the electric wire L extends diagonally downward to the left, Figure 7 shows cross-sectional positions that are offset in the left-right direction above and below.

[0025] The inner surface of the second right wall 52 is provided with a second right bearing support portion 56, which has a larger diameter than the second right notch portion 55 and is cut out in a semicircular shape towards the front. The inner surface of the second left wall 53 is provided with a second left bearing support portion 57, which is opposite to the second right bearing support portion 56. These second right notch portion 55 and second left and right bearing support portions 57 and 56 are formed in positions opposite to the first right notch portion 25 and the first left and right bearing support portions 27 and 26 in the front-rear direction, and the second left and right bearing support portions 57 and 56 support the front portion of the bearing portion 83 that protrudes outward from both sides of the motor case 82.

[0026] The second motor housing 50 has a second flange portion 58 extending outward from the opening end of the second opening 51. An engaging projection 59 projecting rearward is formed at the lower end of the second peripheral wall 54. The engaging projection 59 fits into the first lower notch 29 of the first flange portion 28 described above. The height of the rearward projection of the engaging projection 59 is set such that when the engaging projection 59 is fitted into the first lower notch 29, a gap 70 of a certain size (hereinafter referred to as the "pull-out portion") is formed between the engaging projection 59 and the first lower notch 29. The electric wire L, which will be described later, is pulled out to the outside of the motor cover 2 from this pull-out portion 70.

[0027] The second opening 51 is cut out in a rectangular shape upward at the left and right center of the second flange portion 58 that forms the upper end of the opening, and the second circumferential wall 54 bulges outward in the circumferential direction over a certain range from the cut-out portion. As a result, a recess 62 is formed in the second circumferential wall 54 that is recessed radially outward from the upper end of the opening of the second opening 51 to a certain inclination angle A0 in the circumferential direction (for example, about 100 degrees forward in the circumferential direction from the upper end of the opening of the second opening 51).

[0028] A protruding ridge 60 is formed on a part of the second flange portion 58 at the periphery of the opening of the second opening 51. This protruding ridge 60 engages from the inside with the stepped portion 30 formed at the opening end of the first opening 21 of the first motor housing 20 described above. The second flange portion 58 has a flat second connecting end face 61 extending outward from the base end of the protruding ridge 60. In addition, the second flange portion 58 is provided with a plurality of screw insertion holes H2 for connecting the first motor housing 20 and the second motor housing 50.

[0029] The first motor housing 20 and the second motor housing 50 are formed such that when the first motor housing 20 and the second motor housing 50 are connected, the first connecting end face 31 of the upper first flange portion 28 and the second connecting end face 61 of the upper second flange portion 58 substantially coincide with the vertical line P passing through the motor shaft 81. Therefore, when the first motor housing 20 and the second motor housing 50 are connected, the tip of the protruding portion 60 of the upper second motor housing 50 is located behind the vertical line P (see Figures 7 and 8).

[0030] The motor case 82, which constitutes the outer casing of the motor 80, has a flattened cylindrical shape. The motor 80 housed in the motor case 82 is identical to that of conventionally known motors, so its description is omitted. Bearing portions 83 protrude outward from both sides of the motor case 82. These bearing portions 83 are supported by the first left and right bearing support portions 27, 26 and the second left and right bearing support portions 57, 56 described above. An electrical wiring portion 85 of a certain length and width is provided on the outer circumferential surface 84 of the motor case 82, which is electrically connected to a circuit board (not shown) inside the motor case 82. Multiple electric wires L extend from the electrical wiring portion 85 to connect the circuit board to an object outside the motor case 82 (for example, an external power supply) (to avoid complexity, only one electric wire L is shown in Figures 7 and 8). Each electric wire L is formed by coating a conductor wire with an insulating resin and is flexible. Adhesive is applied to the electrical wiring section 85 to prevent water from entering the motor case 82. The electric wire L extends radially outward from the upper surface of the adhesive layer 86. The shape of the adhesive layer 86 is arbitrary. Alternatively, a connection connector may be provided on the outer surface 84 of the motor case 82 as the electrical wiring section 85.

[0031] The motor case 82 is positioned such that the center line C passing through the circumferential center of the electrical wiring section 85 is separated from the top 87 of the outer circumferential surface 84 of the motor case 82 in the vertical direction (in this embodiment, the intersection point of the vertical line P passing through the motor shaft 81 and the outer circumferential surface 84 of the motor case 82) by a predetermined inclination angle A1 (for example, 40 to 50 degrees circumferentially forward from the vertical line P) in the circumferential direction of the motor case 82. Therefore, when the motor case 82 is covered with the motor cover 2, the electrical wiring section 85 faces the recess 62 formed in the second motor housing section 50 radially outward.

[0032] The recess 62 in the second peripheral wall 54 of the second motor housing 50 is formed such that, taking assembly errors into consideration, the circumferential inclination angle range of the motor case 82 in the region where the recess 62 of the second peripheral wall 54 is formed is greater than the circumferential angular range of the motor case 82 in the region where the electrical wiring portion 85 is formed. For this reason, the radial distance between a certain area D1 (hereinafter referred to as the "wiring peripheral area") surrounding the electrical wiring portion 85 that faces the recess 62 on the outer peripheral surface 84 of the motor case 82 and the inner surface of the recess 62 is greater than the radial distance between the area D2 (hereinafter referred to as the "non-wiring peripheral area") on the outer peripheral surface 84 of the motor case 82 other than the wiring peripheral area D1 and the inner surface of the second peripheral wall 54 of the second motor housing 50, and the radial distance between the non-wiring peripheral area D2 and the inner surface of the first peripheral wall 24 of the first motor housing 20.

[0033] The electric wire L extending radially outward from the electrical wiring section 85 is bent downward near the electrical wiring section 85. Therefore, the bent portion L1 of the electric wire L is housed between the electrical wiring section 85 and the recess 62 of the second motor housing section 50. The downwardly bent electric wire L extends downward toward the outlet portion 70 through the narrow gap between the outer circumferential surface 84 of the motor case 82 and the inner surface of the second circumferential wall 54 of the second motor housing section 50. The electric wire L is pulled out to the outside of the motor cover 2 from the outlet portion 70 formed at the lower connection between the first motor housing section 20 and the second motor housing section 50.

[0034] Next, an example of how the motor cover 2 is assembled will be described. With the blower fan 15 connected to the motor 80, the bearing portion 83 is inserted into the first left and right bearing support portions 27 and 26, and the blower fan 15 is housed in the fan housing portion 18 and the motor case 82 in the first motor housing portion 20 such that the motor shaft 81 extends horizontally through the first right notch portion 25 and the electrical wiring portion 85 faces diagonally upward and forward. Next, the electric wire L extending from the electrical wiring portion 85 is bent downward and temporarily fixed to the first lower notch portion 29 of the first motor housing portion 20. Then, the second flange portion 58 is brought into contact with the first flange portion 28, and with the screw hole H1 of the first motor housing portion 20 and the screw insertion hole H2 of the second motor housing portion 50 aligned, the fastening screw S is inserted from the front into the screw insertion hole H2 and then screwed into the screw hole H1, thereby connecting the first motor housing portion 20 and the second motor housing portion 50, and housing the motor case 82 inside the motor cover 2. At this time, as previously described, the inclination angle range of the recess 62 that is recessed radially outward in the second circumferential wall 54 of the second motor housing portion 50 is greater than the circumferential angle range of the electrical wiring portion 85 of the motor case 82, so that the electrical wiring portion 85 is reliably facing the recess 62 of the second circumferential wall 54, and the electric wire L extending from the electrical wiring portion 85 is housed in the gap between the electrical wiring portion 85 and the recess 62 so that the bent portion L1 of the electric wire L does not come into contact with the inner surface of the recess 62. Furthermore, as shown in Figure 8, the protruding portion 60 at the rear end of the second motor housing 50 engages with the stepped portion 30 at the front end of the first motor housing 20 from the inside. Therefore, radially inward of the connection portion 71 between the first motor housing 20 and the second motor housing 50, the stepped portion 30 at the front end of the first motor housing 20 and the protruding portion 60 at the rear end of the second motor housing 50 are connected by a spigot joint. Radially outward from the stepped portion 30, the first connecting end face 31 of the first flange portion and the second connecting end face 61 of the second flange portion 58 are in surface contact.

[0035] According to the above embodiment, the motor cover 2 is divided into a first motor housing section 20 and a second motor housing section 50. The highly flame-retardant second motor housing section 50, which covers the electrical wiring section 85 from the outside, has a recess 62 that is recessed outward at least at a location on the motor case 82 facing the electrical wiring section 85, and is spaced radially away from the electrical wiring section 85 in the motor case 82. Therefore, even if a flame is formed on the electrical wiring section 85, it is difficult for the flame formed on the electrical wiring section 85 to come into contact with the inner surface of the recess 62 of the second motor housing section 50. Furthermore, the lead-out section 70 for leading the electric wire L to the outside of the motor cover 2 is provided at a position circumferentially separated from the recess 62 of the second motor housing section 50 and the motor case 82, so it is difficult for flames to leak from the lead-out section 70 to the outside of the motor cover 2. This makes it possible to suppress the spread of fire to surrounding parts and improve safety.

[0036] Furthermore, according to the above embodiment, the radial gap of the motor case 82 between the motor case 82 and the motor cover 2 widens in the wiring peripheral area D1, so the bent portion L1 of the electric wire L that bends and extends from the electrical wiring section 85 toward the exit section 70 can be accommodated in the gap. On the other hand, the radial gap of the motor case 82 between the motor case 82 and the motor cover 2 narrows in the non-wiring peripheral area D2, so the overall size of the motor cover 2 can be reduced. As a result, the motor cover 2 can be housed in a compact space.

[0037] Furthermore, according to the above embodiment, the electrical wiring section 85 is located at a predetermined angle of inclination in front of the motor case 82 in the circumferential direction from the top 87 of the outer peripheral surface 84 of the motor case 82 in the vertical direction. Therefore, water adhering to the outer peripheral surface 84 of the motor case 82 flows downward, making it difficult for water to enter the motor case 82 from the electrical wiring section 85. Also, even if a flame is formed in the electrical wiring section 85, the flame extends upward, making it difficult for the flame to leak out of the motor cover 2 from the lower outlet section 70 via the electric wire L that bends downward from the electrical wiring section 85. Moreover, since the bent portion L1 of the electric wire L does not come into contact with the inner surface of the second motor housing section 50, even if a flame travels along the electric wire L, the second motor housing section 50 is not easily heated directly. This further prevents the spread of fire.

[0038] Furthermore, according to the above embodiment, the first motor housing 20 has a first connecting end face 31 that is flat radially outward from the tip of the stepped portion 30, and the second motor housing 50 has a second connecting end face 61 that is flat radially outward from the base end of the protruding portion 60. When the first motor housing 20 and the second motor housing 50 are connected, the first connecting end face 31 and the second connecting end face 61 make surface contact, thus preventing water and moisture from entering the motor cover 2 from the outside.

[0039] Furthermore, according to the above embodiment, the electrical wiring section 85 is located at a predetermined angle of inclination in front of the motor case 82 in the circumferential direction from the top 87 in the vertical direction of the outer peripheral surface 84 of the motor case 82. On the other hand, the protruding portion 60 of the second motor housing section 50 engages with the stepped portion 30 of the first motor housing section 20 from the inside, and the front end of the first motor housing section 20 and the rear end of the second motor housing section 50 are connected by a spigot joint. As shown in Figure 8, the tip of the protruding portion 60 of the second motor housing section 50 that engages with the stepped portion 30 is located behind the vertical line P passing through the top 87 of the motor case 82. Therefore, the connection portion 71 between the first motor housing section 20 and the second motor housing section 50, which faces the upper outer peripheral surface 84 of the motor case 82, is located opposite the electrical wiring section 85 in the circumferential direction of the motor case 82 with respect to the vertical line P. Therefore, even if water enters the motor cover 2 from the connection point 71 between the first motor housing 20 and the second motor housing 50, it is difficult for the water to flow towards the electrical wiring section 85. This further helps to prevent the spread of fire.

[0040] In the above embodiment, a wall-mounted bathroom heater / dryer was used as an example, but the present invention can also be applied to ceiling-mounted bathroom heater / dryers and bathroom heater / dryers with a mist function. It can also be applied to air conditioning systems installed outside of bathrooms. In the above embodiment, the first support section, the first motor housing section 20, and the second support section, the second motor housing section 50, are divided approximately at the center of the motor cover 2, but they may be divided at a position offset from the center. Furthermore, the arrangement of the first support section 20 and the second support section 50 may be reversed front to back depending on the position of the electrical wiring section 85. [Explanation of Symbols]

[0041] 1. Bathroom heater / dryer 2 Motor cover 14 Heat exchanger 15. Blower fan 20 First motor housing 30 Step section 31 First connecting end face 50 Second motor housing 60 Projection part 61 Second connecting end face 62 recesses 70 Drawer section 80 motor 82 Motor Case 85 Electrical Wiring Section 100 Exterior Casing L electric wire L1 bent part

Claims

1. An air conditioning system comprising, within an outer casing, a heat exchanger through which a heat transfer medium flows, a blower fan that circulates air through the heat exchanger and supplies it to the room, a cylindrical motor case housing a motor that rotates the blower fan, and a motor cover that supports the motor case and covers the motor case, The motor case has an electrical wiring section on its outer surface, through which wires extend to electrically connect the circuit board inside the motor case to the object to be connected outside the motor cover. The motor cover comprises at least a first support portion made of a resin material and a second support portion made of a material with higher flame retardancy than the first support portion. The second support portion has a recess that is recessed outward at least at a location facing the electrical wiring portion of the motor case, and is spaced radially away from the electrical wiring portion of the motor case. The electrical wiring extends from the electrical wiring section and is routed to the outside of the motor cover from a recess in the second support section and a pull-out section of the motor cover located at a position circumferentially away from the motor case, in an air conditioning system.

2. In the air conditioning system according to claim 1, An air conditioning system in which the distance between a certain range of the wiring peripheral area on the outer circumferential surface of the motor case, including the electrical wiring section, and the inner surface of the recess of the second support section facing the wiring peripheral area in the radial direction of the motor case is greater than the distance between the non-wiring peripheral area on the outer circumferential surface of the motor case other than the wiring peripheral area and the inner surface of the motor cover facing the non-wiring peripheral area in the radial direction of the motor case.

3. In the air conditioning system according to claim 1 or 2, The motor case is arranged such that the motor shaft extends horizontally, and the electrical wiring section is positioned at a predetermined angle of inclination in the circumferential direction of the motor case, away from the top of the outer surface of the motor case in the vertical direction. The motor cover is positioned so that the pull-out section is located below the electrical wiring section. The wires extending from the electrical wiring section bend downwards from the electrical wiring section and are pulled out from the outlet to the outside of the motor cover. An air conditioning system in which the bent portion of the electric wire does not come into contact with the inner surface of the recess of the second support portion.

4. In the air conditioning system according to claim 3, The motor cover is constructed by connecting a first support section and a second support section, which are divided radially from the motor case. At the connection point facing the upper outer surface of the motor case, the tip of the first support part and the tip of the second support part are connected by a spigot joint. The first support portion and the second support portion are provided in an air conditioning device in which the connecting portion facing the upper outer surface of the motor case is positioned opposite the electrical wiring portion in the circumferential direction of the motor case with respect to a vertical line passing through the top of the outer surface of the motor case.

5. In the air conditioning system according to claim 4, The first support portion is a connecting portion facing the upper outer circumferential surface of the motor case, and has a stepped portion recessed radially outward from the motor case and a first connecting end face extending radially outward from the tip of the stepped portion. The second support portion is a connecting portion facing the upper outer circumferential surface of the motor case, and has a protruding portion that projects toward the first support portion, and a second connecting end face that extends radially outward from the base end of the protruding portion toward the motor case. The first support portion and the second support portion are connecting portions facing each other on the upper outer circumferential surface of the motor case, and the protruding portion of the second support portion engages with the stepped portion of the first support portion from the inside, and the first connecting end face of the first support portion and the second connecting end face of the second support portion are in surface contact with each other in this air conditioning device.

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