Bathroom heater

Abstract

To provide a bathroom heater enabling enhancement of safety when a strong electric portion of a substrate in a resin mold fires in a motor driving an air blowing fan.SOLUTION: A bathroom heater 1 is installed in a ceiling and includes an air blowing fan 32, a motor 6 driving the air blowing fan 32 and a mounting plate 35 for mounting the motor 6. In the motor 6, a motor body 61 is resin molded, and a substrate 7 including a strong electric portion 71 to which high voltage is applied is provided in the resin mold. The mounting plate 35 includes a wall part 5 separating from the motor body 61 and formed of an incombustible material or a fire-retarding material at least covering an upper side of the strong electric portion 71 of the substrate 7. The wall part 5 is provided to protrude to the axial direction of a motor shaft 62 at least on the upper side of the strong electric portion 71 of the substrate 7 on the mounting side of the motor body 61 in the mounting plate 35 and to open a motor end surface 64 on the side opposite to the mounting side of the mounting plate 35 to the motor body 61.SELECTED DRAWING: Figure 4

Description

[Technical Field]

[0001] The present invention relates to a bathroom heater that is installed in the ceiling. [Background technology]

[0002] Conventionally, there is known a bathroom heater / dryer that is installed in the ceiling and that is provided with a means for preventing the spread of fire in the event of a fire occurring in the connection area where the wiring is connected to the ventilation fan motor that drives the ventilation fan (Patent Document 1). In this conventional bathroom heater / dryer, the ventilation fan motor is a resin-molded motor, and a motor cover is attached to the motor arrangement space of the ventilation fan motor. The motor cover is provided with a cover section made of a non-combustible or flame-retardant material that covers the connection area where the wiring is connected to the ventilation fan motor, and this cover section makes it difficult for the fire to spread from the connection area if a fire occurs in the connection area due to a tracking phenomenon. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Publication No. 2020-165576 Summary of the Invention [Problem to be solved by the invention]

[0004] Resin-molded motors have a circuit board inside the resin mold that contains high-voltage components to which high voltage is applied. These high-voltage components include electrical components such as resistors and capacitors, wiring terminals, and copper foil circuit patterns. These high-voltage components can become a source of fire if a current leak occurs due to moisture or other factors. However, in the conventional bathroom heater / dryer, no fire prevention measures were implemented to prevent the spread of fire in the event of a fire starting in the high-voltage components of the circuit board inside the resin mold in the ventilation fan motor.

[0005] The present invention was made in consideration of the above circumstances, and aims to provide a bathroom heater that can increase safety in the event of a fire occurring in the high-voltage part of the substrate inside the resin mold in the motor that drives the blower fan. [Means for solving the problem]

[0006] The bathroom heater according to the present invention comprises: A bathroom heater installed in the attic, The air conditioner includes a blower fan, a motor that drives the blower fan, and a mounting plate to which the motor is attached; The motor has a motor shaft that penetrates the mounting plate and is connected to the blower fan, and a motor body that is attached to the mounting plate with the motor shaft in a substantially horizontal position; The motor body is molded in resin. Inside the resin mold of the motor body, there is a circuit board that includes a high-voltage section to which high voltage is applied. The mounting plate is provided with a wall portion formed of a non-combustible or flame-retardant material, spaced apart from the motor body and covering at least the upper portion of the high-voltage portion of the board.

[0007] With this configuration, a flame that breaks out from the high-voltage part of the circuit board in the motor body spreads vertically, but is protected by the wall covering the high-voltage part above, preventing the flame from spreading beyond the wall. Therefore, if a fire breaks out in the high-voltage part of the circuit board of the motor body, the fire can be prevented from spreading to the surrounding area of the appliance above the ceiling. Therefore, for a resin-molded motor included in a bathroom heater, if the high-voltage part of the circuit board inside the resin mold becomes an ignition source and the motor catches fire, the fire can be prevented from spreading, improving safety.

[0008] In the bathroom heater, The wall portion can be provided on the mounting plate on the side where the motor body is attached, at least above the high-voltage portion of the circuit board, and protruding in the axial direction of the motor shaft, so as to open the motor end face on the side opposite the mounting plate on which the motor body is attached.

[0009] As a result, the flame that starts from the high-voltage part of the motor body's circuit board and spreads vertically hits the wall, bends, and spreads sideways toward the open end of the wall, so the wall covers the entire flame, preventing the flame from leaking outside the open end of the wall and preventing the fire from spreading to the surrounding area.

[0010] Furthermore, because the wall leaves the motor end face opposite the mounting plate attached to the motor body open, heat dissipation from the motor is not impeded when the fan is running, and heating of the wall due to heat generated by the motor is suppressed. Because heating of the wall is suppressed, it is expected that flames ignited from the high-voltage part of the motor body's circuit board will be cooled when they come into contact with the wall, making it difficult for the flames to spread farther. This is expected to contribute to the effect of preventing flames from spreading outside the wall.

[0011] In the bathroom heater, The wall portion may be formed integrally with a mounting plate made of a non-combustible or flame-retardant material.

[0012] This reduces the number of parts and assembly steps compared to constructing the wall portion and mounting plate separately, making it possible to provide a mounting plate with a wall portion at low cost. Also, by forming the mounting plate from a non-flammable or flame-retardant material, even if a flame breaks out in the high-voltage part of the motor body's circuit board, it will not penetrate the mounting plate and cause a fire to spread.

[0013] In the bathroom heater, The wall portion can be formed to surround the periphery of the motor body.

[0014] This ensures the strength of the wall, preventing it from breaking before the motor catches fire. Furthermore, if a fire were to occur in the high-voltage portion of the motor's circuit board, the wall surrounding the motor body is expected to suppress the supply of air to the flame. This is expected to contribute to the beneficial effect of suppressing the formation of a flame and preventing the flame from spreading beyond the wall. Furthermore, when the blower fan is operating, the wall surrounding the motor body can prevent motor drive noise from leaking outward from the wall.

[0015] In the bathroom heater, A wiring outlet portion is formed protruding from the side of the motor body, from which lead wires connected to the circuit board are drawn out. A cylindrical barrier portion made of a non-flammable or flame-retardant material may be provided so as to surround the wiring outlet portion.

[0016] This prevents the flame from spreading outside the barrier section even if it ignites in the high-voltage part of the motor body's circuit board and travels up the lead wires to the wiring outlet section in a lateral direction, thereby preventing the flame from spreading to the surrounding area of the appliance.

[0017] In the bathroom heater, The height of the wall from the mounting plate can be set to be equal to or less than the height of the motor end face on the open side opposite the mounting side of the motor body, and the distance from the side of the motor body to the wall on a vertical line and the height of the wall from the mounting plate can be set so as to include at least the range that the flame can reach due to the expected length of the flame extending vertically from the high-voltage part of the motor body's circuit board.

[0018] A flame igniting from the high-voltage portion of the motor body's circuit board extends vertically upward from the side of the motor body, bends when it hits the wall, and extends laterally toward the open end of the wall. Therefore, by setting the wall's clearance and height to at least include the range of the flame's estimated length, the wall can completely cover the flame, ensuring that it does not spread beyond the wall. Furthermore, by setting the wall's height equal to or less than the height of the open-side motor end face, the dimensions of the appliance can be contained within the open-side motor end face without being dependent on the wall's height. By setting the wall's clearance from the motor body so that it is not too far away, a large mounting plate is not required. This avoids an increase in the appliance's size and ensures that a fire is prevented from spreading to the surrounding area in the event of a fire igniting from the high-voltage portion of the motor body's circuit board. [Brief explanation of the drawings]

[0019] [Figure 1] 1 is a perspective view showing a bathroom heater / dryer according to an embodiment. [Figure 2] 1 is a cross-sectional view showing a bathroom heater / dryer according to an embodiment. [Figure 3] FIG. 2 is a perspective view showing a ventilation fan motor and a wall portion in the ventilation unit. [Figure 4] 1A and 1B are diagrams for explaining the relationship between the distance and height of the wall and the expected length of the flame in the installation form (left-blowing type) of the ventilation unit shown in FIG. 1, where FIG. 1A is a cross-sectional view taken along line XX in FIG. 1B, and FIG. 1B is a front view of the ventilation fan motor, wall, and mounting plate. [Figure 5] This is a perspective view showing the bathroom heater / dryer when the ventilation unit is installed in a right-blowing type, rotated 180 degrees from the left-blowing type in Figure 1. [Figure 6] 6A and 6B are diagrams for explaining the relationship between the distance and height of the wall and the expected length of the flame in the installation form (right-blowing type) of the ventilation unit shown in FIG. 5, where FIG. 6A is a cross-sectional view taken along line YY in FIG. 6B, and FIG. 6B is a front view of the ventilation fan motor, wall, and mounting plate. [Figure 7]FIG. 10 is a cross-sectional view showing a modified example of the wall portion. DETAILED DESCRIPTION OF THE INVENTION

[0020] Hereinafter, an embodiment of the present invention will be described with reference to the drawings. As shown in Figures 1 and 2, bathroom heater / dryer 1 according to this embodiment is installed in the ceiling of a bathroom and includes a heating unit 2 for heating the bathroom and a ventilation unit 3 for ventilating the bathroom. In this specification, the side on which ventilation unit 3 is attached is referred to as the front, and when viewing ventilation unit 3 from the front, the depth direction is referred to as the front-to-back direction, the width direction as the left-to-right direction, and the length direction as the up-to-down direction.

[0021] The heating unit 2 includes a substantially rectangular box-shaped main body case 21 that is embedded in a mounting opening 41 in the ceiling wall 4, and a heat exchanger 22 and a circulation fan 23 that are disposed in an air passage 27 within the main body case 21. A louver 28 is attached to the outlet of the air passage 27. A cover plate 24 that covers the bathroom side is attached to an opening on the underside of the main body case 21. The cover plate 24 is provided with an intake port 25 and an outlet port 26. A heat medium such as hot water is circulated and supplied to the heat exchanger 22 by a heat source unit (not shown). The circulation fan 23 is formed by a line flow fan (registered trademark) or the like, and is driven by a circulation fan motor (not shown). The circulation fan motor is attached to the main body case 21 with the motor shaft connected to the circulation fan 23 in a substantially horizontal position.

[0022] The ventilation unit 3 includes a ventilation fan case 31 that is connected to the main body case 21 and attached to the side of the main body case 21, a ventilation fan 32 that serves as a blower fan disposed within the ventilation fan case 31, and a ventilation fan motor 6 that drives the ventilation fan 32. In the installed state shown in FIG. 1 , the ventilation fan case 31 has an exhaust pipe 33 protruding from the left side and a board case 34 protruding from the right side. The board case 34 houses a control board that controls the operation of the ventilation fan 32. The front side of the ventilation fan case 31 is formed by a mounting plate 35 attached to the ventilation fan case 31, and the ventilation fan motor 6 is attached to the outer surface of the mounting plate 35. That is, the ventilation fan motor 6 is provided with a cylindrical motor body 61 exposed on the outer surface of the ventilation fan case 31. The ventilation fan 32 is formed by a sirocco fan or the like and is installed with its rotation axis approximately horizontal.

[0023] In heating operation, bathroom heater / dryer 1 configured as described above drives circulation fan 23 to draw bathroom air into main body case 21, where it passes through air duct 27, is heated by heat exchanger 22, and is then blown out into the bathroom. In ventilation operation, drive ventilation fan 32 to draw bathroom air from main body case 21 into ventilation fan case 31, and then exhausts it to the outside through exhaust pipe 33. In drying operation, heating and ventilation operations are performed simultaneously. Ventilation unit 3 may be connected to ventilation piping that communicates with other rooms, allowing ventilation in addition to the bathroom, such as a dressing room or toilet.

[0024] Next, measures to prevent the spread of fire in ventilation fan motor 6 in ventilation unit 3 of bathroom heater / dryer 1 will be described.

[0025] 2 and 3, the ventilation fan motor 6 includes a motor shaft 62 that passes through the shaft hole 36 in the mounting plate 35 and is connected to the ventilation fan 32, and a cylindrical motor body 61 that is attached to the mounting plate 35 with the motor shaft 62 in a substantially horizontal position. The ventilation fan motor 6 is a resin-molded motor in which the motor body 61 is molded in resin. A substrate 7 including a high-voltage section 71 to which a high voltage is applied is provided inside the resin mold of the motor body 61.

[0026] High-voltage portion 71 is a portion to which 15 W or more of power may be supplied, even in the event of a malfunction, at AC 30 V or higher or DC 42 V or higher. For example, in a board 7 such as an electrical board, this corresponds to the portion of board 7 on which electrical components such as resistors and capacitors, wiring terminals, copper foil circuit patterns, etc. are provided. High-voltage portion 71 of board 7 can become a source of ignition if a current leak occurs due to moisture caused by aging, tracking, etc. Board 7 is molded in resin, but in areas where the resin is thin, if high-voltage portion 71 of board 7 ignites, the resin may melt and the flame may leak outside the resin mold.

[0027] This embodiment is provided with a fire prevention mechanism in case of a fire occurring in the high-voltage portion 71 of the circuit board 7 inside the resin mold of the motor body 61. Specifically, as shown in FIGS. 3 and 4 , a wall portion 5 is provided on the outer surface of the mounting plate 35, on which the motor body 61 is attached, spaced from the cylindrical side surface 63 of the motor body 61 and surrounding the periphery of the motor body 61. The wall portion 5 is made of a non-combustible or flame-retardant material. For example, the wall portion 5 is made of a UL945VA thermosetting flame-retardant resin. However, the wall portion 5 may be made of a material equivalent to UL945VA, or a non-combustible material such as metal, ceramic, or insulator. The wall portion 5 is formed integrally with the mounting plate 35, and the mounting plate 35 and the wall portion 5 are made of the same non-combustible or flame-retardant material.

[0028] 4, in the ventilation fan motor 6 of the embodiment, the substrate 7 is provided inside the motor body 61 at a position closer to the protruding side of the motor shaft 62 (see FIG. 4(a)), and extends radially around the entire circumference of the motor body 61 (see FIG. 4(b)). If the substrate 7 catches fire, the high-voltage portion 71 of the substrate 7 that could melt the resin mold of the motor body 61 and cause flames to leak out from the side surface 63 of the motor body 61 is identified as the portion ranging from a position diagonally below left of the motor body 61 to a position directly to the right in a clockwise direction (roughly the range from 7:30 to 3:00) and 2 mm to 7 mm deep from the cylindrical side surface 63 of the motor body 61 toward the center, as seen in a front view of the open motor end face 64, with reference to FIGS.

[0029] In the installed state, the wall portion 5 is spaced outward from the side surface 63 of the motor body 61, protrudes at least above the high-voltage portion 71 of the circuit board 7 in the axial direction of the motor shaft 62, and is provided so as to cover the area above the high-voltage portion 71 of the circuit board 7 inside the motor body 61. Flames have the tendency to spread vertically upward from ignition point A. Therefore, a flame ignited from the high-voltage portion 71 of the circuit board 7 of the motor body 61 spreads vertically upward from the high-voltage portion 71 at ignition point A and is guarded by the wall portion 5 covering the area above the high-voltage portion 71 of the circuit board 7, preventing the flame from spreading beyond the wall portion 5. In other words, the flame spreading vertically upward from the motor body 61 hits the wall portion 5, bends toward the open end of the wall portion 5, and spreads sideways, thereby completely covering the flame. Therefore, the flame is prevented from leaking out beyond the open end of the wall portion 5. Therefore, if a fire occurs in the high-voltage portion 71 of the circuit board 7 of the motor main body 61, it is possible to prevent the fire from spreading to the surroundings of the appliance above the ceiling.

[0030] The wall 5 is provided with respect to the motor body 61 so that the motor end face 64 opposite the side where the mounting plate 35 is attached is open. This does not impede the heat dissipation of the ventilation fan motor 6 when the ventilation fan is operating, and also suppresses heating of the wall 5 due to heat generated by the ventilation fan motor 6. Because heating of the wall 5 is suppressed, it is expected that a flame ignited in the high-voltage portion 71 of the circuit board 7 of the motor body 61 will be cooled when it comes into contact with the wall 5, making it difficult for the flame to spread. That is, a flame that spreads vertically upward from the motor body 61 is cooled by contact with the wall 5 in the early stages of ignition, preventing the flame from spreading too far. Thereafter, as the temperature of the wall 5 rises, the ignition fuel source in the high-voltage portion 71 of the circuit board 7 is burned out, reducing the flame size. As a result, it is expected that this contributes to the effect of preventing the flame from spreading beyond the wall 5 within the duration of the combustion (e.g., 5 minutes).

[0031] Because the wall portion 5 is formed integrally with the mounting plate 35 made of a non-combustible or flame-retardant material, the number of parts and assembly steps are reduced compared to when the wall portion 5 and the mounting plate 35 are constructed separately, and the mounting plate 35 provided with the wall portion 5 can be provided at low cost. Furthermore, by forming the mounting plate 35 from a non-combustible or flame-retardant material, even if a cone-shaped flame ignites in the high-voltage part 71 of the circuit board 7 of the motor main body 61, it will not penetrate the mounting plate 35 and cause the fire to spread.

[0032] Because the wall 5 is formed to surround the periphery of the motor body 61, the strength of the wall 5 is ensured, and therefore the wall 5 is prevented from being damaged before the ventilation fan motor 6 ignites. Furthermore, if a fire breaks out in the high-voltage portion 71 of the circuit board 7 of the motor body 61 and a flame occurs, the wall 5 surrounding the periphery of the motor body 61 also surrounds the flame, which is expected to suppress the supply of air to the flame, suppress the formation of the flame, and contribute to the effect of preventing the flame from spreading outside the wall 5. Furthermore, when the ventilation fan is operating, the wall 5 surrounding the periphery of the motor body 61 can suppress the motor driving noise from leaking outward from the wall 5.

[0033] Incidentally, ventilation unit 3 in bathroom heater / dryer 1 of this embodiment is configured to be attachable to main body case 21 so that the direction of air discharge from exhaust pipe 33 can be rotated 180 degrees depending on the installation environment. That is, in the installation configuration shown in Figure 1, exhaust pipe 33 is installed with air discharge facing left, and in the installation configuration shown in Figure 5, exhaust pipe 33 is installed with air discharge facing right. Therefore, in each installation configuration of ventilation unit 3, the position of high-voltage section 71 of circuit board 7 inside motor main body 61 is rotated 180 degrees, so that it is upside down.

[0034] In this embodiment, the wall 5 is formed to surround the periphery of the motor body 61. In the left-blowing type installation configuration (FIG. 1), one vertical wall portion 51 of the wall 5 (the lower portion of the wall 5 on the side farther from the motor body 61, see FIG. 4) covers the upper part of the high-voltage portion 71. In the right-blowing type installation configuration (FIG. 5), the other vertical wall portion 52 of the wall 5 (the higher portion of the wall 5 on the side closer to the motor body 61, see FIG. 6) covers the upper part of the high-voltage portion 71. In this way, the wall 5 is disposed so as to cover the upper part of the high-voltage portion 71 of the circuit board 7 inside the motor body 61, depending on the two installation configurations of the ventilation unit 3. Therefore, in the event of a fire breaking out in the high-voltage portion 71 of the circuit board 7 of the motor body 61, the wall 5 can prevent the fire from spreading, depending on the two installation configurations of the ventilation unit 3.

[0035] Heights H1 and H2 of wall 5 from mounting plate 35 are set to be equal to or lower than the height of motor end face 64 on the open side. Distances L1 and L2 from cylindrical side surface (top surface) 63 of motor body 61 to wall 5 above in the vertical direction and heights H1 and H2 of wall 5 from mounting plate 35 are set to include at least the range that a flame can reach due to an estimated length F of the flame extending vertically from high-voltage portion 71 of circuit board 7 of motor body 61 (see FIGS. 4 and 6).

[0036] Because the performance and size of ventilation fan motor 6 used in bathroom heater / dryer 1 are specified in advance, the expected flame length F extending vertically from high-voltage portion 71 of circuit board 7 of motor body 61 can be determined based on experiments, data provided by the motor manufacturer, and JIS standard (JIS C 62368-1 6.4.7). For example, expected flame length F can be set to 50 mm from ignition point A of high-voltage portion 71 of circuit board 7. The flame is assumed to have a cone shape with a radius of 13 mm. Therefore, the vertical distances L1 and L2 from side surface 63 of motor body 61 to wall 5 and the heights H1 and H2 of wall 5 from mounting plate 35 are set to include a length range in which the sum of the length of vertical line F1 extending vertically from high-voltage portion 71 of circuit board 7 and the length of horizontal line F2 extending horizontally from the upper end point of this vertical line is 50 mm (see Figures 4 and 6). Furthermore, taking into consideration that the flame has a cone shape that spreads over a radius of 13 mm, the width of the wall portion 5 is set to be at least 13 mm wider at each end of the high-voltage section 71, but by forming the wall portion 5 to surround the periphery of the motor body 61, it is possible to deal with the radial spread of the flame.

[0037] A flame ignited from the high-voltage portion 71 of the circuit board 7 of the motor body 61 extends vertically upward from the side surface 63 of the motor body 61, bends when it hits the wall portion 5, and extends sideways toward the open end of the wall portion 5. Therefore, by setting the separation distances L1 and L2 and the height of the wall portion 5 so as to include at least the range that the flame can reach due to the estimated length F of the flame, the wall portion 5 can cover the entire flame, and it is possible to reliably prevent the flame from spreading outside the wall portion 5.

[0038] By setting the heights H1 and H2 of the wall 5 to be equal to or less than the height to the motor end face 64 on the open side, the dimensions of the fixture can be contained up to the motor end face 64 on the open side without being dependent on the heights H1 and H2 of the wall 5. By setting the distances L1 and L2 from the motor body 61 so that the wall 5 is not too far away from the motor body 61, there is no need to provide a large mounting plate 35. This avoids an increase in size of the fixture, and prevents flames from spreading beyond the wall 5 in the event of a fire breaking out from the high-voltage part 71 of the circuit board 7 of the motor body 61, ensuring that the fire does not spread to areas around the fixture above the ceiling.

[0039] In this embodiment, the wall portion 5 is provided on the mounting plate 35 of an existing size. That is, when the ventilation unit 3 is installed in a left-blowing type installation configuration (FIG. 1), as shown in FIG. 4, the distance L1 between one wall portion 51 above the high-voltage portion 71 of the board 7 and the side surface (top surface) 63 of the motor main body 61 can be set relatively long, and the height H1 of the wall portion 5 can be set correspondingly low. On the other hand, when the ventilation unit 3 is installed in a right-blowing type installation configuration (FIG. 5), as shown in FIG. 6, the distance L2 between the other wall portion 52 above the high-voltage portion 71 of the board 7 and the side surface (top surface) 63 of the motor main body 61 can be set only short, and the height H2 of the wall portion 5 can be set correspondingly high. In this way, the two installation configurations of the ventilation unit 3 can be accommodated, avoiding an increase in the size of the appliance and reliably preventing the spread of fire to the surrounding area in the event of a fire starting at the high-voltage portion 71 of the board 7 of the motor main body 61.

[0040] 3, a plurality of legs 65 for mounting to the mounting plate 35 are provided on the side surface 63 of the motor body 61, and the portions of the wall 5 facing the legs 65 are bulged outward to form bulging wall portions 53, thereby positioning the legs 65. Therefore, the ventilation fan motor 6 is correctly mounted with its circumferential position positioned relative to the mounting plate 35, and the wall portions 5 on the mounting plate 35 are disposed above the high-voltage portion 71 of the circuit board 7 inside the motor body 61, accommodating the two installation configurations of the ventilation unit 3.

[0041] 3, a wiring outlet 66 from which lead wires connected to the circuit board 7 are drawn is formed to protrude from a side surface 63 of the motor body 61, and a cylindrical barrier portion 54 made of a non-combustible or flame-retardant material is provided to surround the wiring outlet 66. The barrier portion 54 is formed integrally with the mounting plate 35 and is provided continuous with the wall portion 5. The protruding length of the barrier portion 54 is set to include the range of the estimated flame length F from the position of the high-voltage portion 71 of the circuit board 7 corresponding to the position of the wiring outlet 66 or the position of the lead wire outlet at the tip of the wiring outlet 66. As a result, even if a flame ignites in the high-voltage portion 71 of the circuit board 7 of the motor body 61 and spreads laterally from the wiring outlet 66 along the lead wires, the flame can be prevented from spreading outside the barrier portion 54, thereby preventing the fire from spreading to the surrounding area of the fixture above the ceiling.

[0042] As described above, according to the bathroom heater / dryer 1 of this embodiment, the ventilation fan motor 6 provided in the bathroom heater / dryer 1 is provided with a wall portion 5 that covers the upper part of the high-voltage portion 71 of the circuit board 7 inside the resin-molded motor body 61, and a barrier portion 54 that covers the wiring outlet portion 66, thereby preventing the spread of fire in the event that the high-voltage portion 71 of the circuit board 7 inside the motor body 61 becomes an ignition source and causes the ventilation fan motor 6 to catch fire, thereby increasing safety.

[0043] The present invention is not limited to the above-described embodiment, and various modifications can be made within the scope of the claims. For example, the wall portion 5 may be provided so as to surround a part of the periphery of the motor body 61 as long as it covers at least the upper part of the high-voltage portion 71 of the substrate 7 inside the motor body 61 . The wall portion 5 can be provided for the circulation fan motor of the heating unit 2, or may be provided only for the circulation fan motor. In addition, although the mounting plate 35 and the wall portion 5 are integrally formed in the embodiment, they may be configured as separate parts. When the mounting plate 35 and the wall portion 5 are configured as separate parts, the mounting plate 35 and the wall portion 5 do not need to be formed from the same material; for example, the mounting plate 35 does not need to be formed from a non-combustible material or a flame-retardant material equivalent to UL945VA. 7, protrusions 511, 521 that protrude inward (toward the ventilation motor fan 6) may be provided at the open end of the wall 5 at least above the high-voltage part 71. This makes it possible to more reliably prevent the flames (hot air) generated by the ventilation fan motor 6 from overflowing from the wall 5. The present invention can also be applied to a bathroom heater (bathroom air conditioner) equipped with only heating unit 2 or ventilation unit 3. [Explanation of symbols]

[0044] 1 Bathroom heater / dryer 2 heating units 3 Ventilation unit 4 Ceiling Wall 5 Wall 6 Ventilation fan motor 7. Circuit Board 21 Main unit case 22 Heat exchanger 23 Circulation fan 24 Cover plate 25 Intake port 26 Air outlet 27 Wind path 28 Louver 31 Ventilation fan case 32 Ventilation fan (blower fan) 33 Exhaust stack 34 Circuit board case 35 Mounting plate 36 Shaft hole 41 Mounting port 51 One wall part (lower side) 52 Other wall part (higher side) 53 Bulging wall part 54 Barrier section 61 Motor body 62 Motor shaft 63 Side of motor body 64 Motor end face 65 Legs 66 Wiring outlet 71 Strong electric part A. Ignition point F Estimated flame length H1, H2 wall height L1, L2 Wall spacing

Claims

1. A bathroom heater installed in the attic, The air conditioner includes a blower fan, a motor that drives the blower fan, and a mounting plate to which the motor is attached; The motor has a motor shaft that penetrates the mounting plate and is connected to the blower fan, and a motor body that is attached to the mounting plate with the motor shaft in a substantially horizontal position; The motor body is molded in resin. Inside the resin mold of the motor body, there is a circuit board that includes a high-voltage section to which high voltage is applied. The mounting plate is provided with a wall portion formed of a non-combustible or flame-retardant material, spaced apart from the motor body and covering at least the upper portion of the high-voltage portion of the circuit board; the blower fan, the motor, and the mounting plate are configured so that the direction of air blown by the blower fan can be changed to a position rotated 180 degrees, The wall portion is provided on one side and the other side in the up-down direction of the motor body, the one wall portion is disposed on a side farther away from the motor body and has a lower height from the mounting plate; In a bathroom heater, the other wall portion is arranged on the side closer to the motor body and is set at a higher height from the mounting plate.

2. A bathroom heater installed in the attic, The air conditioner includes a blower fan, a motor that drives the blower fan, and a mounting plate to which the motor is attached; The motor has a motor shaft that penetrates the mounting plate and is connected to the blower fan, and a motor body that is attached to the mounting plate with the motor shaft in a substantially horizontal position; The motor body is molded in resin. Inside the resin mold of the motor body, there is a circuit board that includes a high-voltage section to which high voltage is applied. The mounting plate is provided with a wall portion formed of a non-combustible or flame-retardant material, spaced apart from the motor body and covering at least the upper portion of the high-voltage portion of the circuit board; The wall portion is provided on the mounting plate on the side where the motor body is attached, at least above the high-voltage part of the circuit board, and protrudes in the axial direction of the motor shaft, so that the end face of the motor on the opposite side to the mounting plate is open relative to the motor body.

3. A bathroom heater installed in the attic, The air conditioner includes a blower fan, a motor that drives the blower fan, and a mounting plate to which the motor is attached, The motor has a motor shaft that penetrates the mounting plate and is connected to the blower fan, and a motor body that is attached to the mounting plate with the motor shaft in a substantially horizontal position; The motor body is molded in resin. Inside the resin mold of the motor body, there is a circuit board that includes a high-voltage section to which high voltage is applied. The mounting plate is provided with a wall portion formed of a non-combustible or flame-retardant material, spaced apart from the motor body and covering at least the upper portion of the high-voltage portion of the circuit board; A bathroom heater in which the height of the wall from the mounting plate is set to be equal to or less than the height of the motor end face on the open side opposite the mounting plate of the motor body, and the distance from the side of the motor body to the wall on a vertical line and the height of the wall from the mounting plate are set so as to include at least the range that the flame can reach due to the expected length of the flame extending vertically from the high-voltage part of the motor body's circuit board.

4. The bathroom heater according to any one of claims 1 to 3, A bathroom heater in which the wall section is integrally formed with a mounting plate made of non-flammable or flame-retardant material.

5. The bathroom heater according to any one of claims 1 to 4, In this bathroom heater, the wall portion is formed to surround the periphery of the motor body.

6. The bathroom heater according to any one of claims 1 to 5, A wiring outlet protrudes from the side of the motor body, from which lead wires connected to the circuit board are drawn out. A bathroom heater that has a cylindrical barrier section made of non-flammable or flame-retardant material that surrounds the wiring outlet.

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