Blower

Abstract

To provide a bathroom ventilator, dryer and heater that can inhibit generation of noise.SOLUTION: A bathroom ventilator, dryer and heater 1A comprises a circulation ventilation fan that draws in and blows out air. The circulation ventilation fan comprises a rotationally driven impeller 25A. The impeller 25A comprises a plurality of blades 252A that are arranged side by side along the circumferential direction of the impeller 25A. The blades 252A have an entrance angle β1 of from 60° to 80° inclusive, an exit angle β2 from 130° to 150° inclusive, and a thickness greater than or equal to 1 mm and less than 2 mm.SELECTED DRAWING: Figure 7

Description

[Technical field]

[0001] The present invention relates to an air blower that is installed in a bathroom or the like and blows out air or warm air into the room according to the room temperature. [Background technology]

[0002] Conventionally, there have been proposed air blowers that are installed on the ceiling of a bathroom or the like and blow out warm air or air according to the room temperature into the room, thereby realizing functions such as heating the room and drying items to be dried in the room. Many of these air blowers also have a ventilation function that exhausts the air in the room to the outside, and are called bathroom ventilator / dryer / heater.

[0003] Bathroom ventilator / dryer / heater units are equipped with a centrifugal fan that has a multi-blade impeller, and the impeller is driven to rotate to generate the desired air flow. For such bathroom ventilator / dryer / heater units, a technology has been proposed that includes a diversion member called a diversion damper that divides the air drawn in from the bathroom into an air duct that blows the air out into the bathroom, and an air duct that exhausts the air to the outside.

[0004] In bathroom ventilator / dryer / heater units equipped with such a diverting member, a technology has been proposed in which a rectifying member that rectifies the air flow is provided in the diverting member (see, for example, Patent Document 1).In addition, a technology has been proposed in which a member that rectifies the air flow is provided in the fan case (see, for example, Patent Document 2).

[0005] Furthermore, in order to improve blade efficiency, a technique has been proposed in which an aileron is provided on the impeller (see, for example, Patent Document 3). [Prior art documents] [Patent documents]

[0006] [Patent Document 1] Patent No. 5263350 [Patent Document 2] Patent No. 5538622 [Patent Document 3] JP 2006-17037 A Summary of the Invention [Problem to be solved by the invention]

[0007] Conventionally, when a bathroom ventilator / dryer / heater is operated while someone is in the bathroom, such as while taking a bath, there is an issue of loud operating noise. In bathroom ventilator / dryer / heater devices that use centrifugal fans, air has difficulty flowing to the upper part of the blades, and air does not pass over the entire height of the blades, increasing ventilation resistance and generating noise.

[0008] In addition, the air drawn in from the bathroom passes through a filter, but dust and other particles that cannot be captured by the filter may adhere to the impeller. If dust and other particles adhere to the impeller, the airflow resistance increases and the air volume may decrease. In order to prevent the decrease in air volume, the impeller's rotation speed must be increased, which becomes a source of noise.

[0009] The present invention has been made to solve such problems, and has an object to provide a blower device that is capable of suppressing the generation of noise. [Means for solving the problem]

[0010] In order to solve the above-mentioned problems, the present invention provides a fan having a blower fan that draws in and blows out air, and a filter through which the air drawn into the blower fan passes, the blower fan being composed of a centrifugal fan having a rotationally driven impeller and a case portion that rectifies the flow of air generated by the impeller, the impeller having a plurality of blades arranged in parallel along the circumferential direction of the impeller, the blades having an inlet angle of 60° or more and 80° or less, the angle between a tangent to a first imaginary circle defined by the inner diameter of the blade and the blade in the vicinity of the inner diameter, the outlet angle of the blade of 130° or more and 150° or less, the angle between a tangent to a second imaginary circle defined by the outer diameter of the blade and the blade in the vicinity of the outer diameter, and a thickness of 1 mm or more and less than 2 mm, thereby preventing dust that cannot be captured by the filter from adhering to the blades, The case portion includes a first air passage forming portion that rectifies the air flow along the circumferential direction of the impeller, a second air passage forming portion that rectifies the air flow along the tangential direction of the impeller, a tongue portion formed between the first air passage forming portion and the second air passage forming portion, an outlet provided on the underside of the case portion when the rotation axis of the impeller is oriented along the up-down direction and through which air is blown out, and an air passage height expanding portion that expands the height of the air passage from the portion where the tongue portion is provided toward the portion where the outlet is provided. It is a blower device.

[0011] In the present invention, when the inlet angle and the outlet angle are within the above-mentioned ranges, adhesion of dust to the blades is suppressed.

[0012] Furthermore, in the present invention, when the inlet angle and outlet angle are within the above-mentioned ranges, a predetermined air volume can be secured without increasing the impeller rotation speed, and the generation of noise associated with increasing the impeller rotation speed can be suppressed. Effect of the Invention

[0013] In the present invention, the shape of the impeller blades prevents dust and the like from adhering to the blades. Also, the shape of the impeller blades makes it possible to ensure a predetermined air volume without increasing the impeller rotation speed, and to prevent an increase in noise that would accompany increasing the impeller rotation speed. [Brief description of the drawings]

[0014] [Figure 1] 1 is a configuration diagram showing an example of a bathroom ventilation, drying and heating apparatus according to an embodiment of the present invention; [Diagram 2] 1 is a configuration diagram showing an example of a bathroom ventilation, drying and heating apparatus according to an embodiment of the present invention; [Diagram 3] 1 is a configuration diagram showing an example of a bathroom ventilation, drying and heating apparatus according to an embodiment of the present invention; [Figure 4A] FIG. 1 is a configuration diagram showing an example of installation of a bathroom ventilation / drying / heating machine according to an embodiment of the present invention. [Figure 4B] FIG. 1 is a configuration diagram showing an example of installation of a bathroom ventilation / drying / heating machine according to an embodiment of the present invention. [Figure 5A] FIG. 2 is a perspective view showing an example of a flow dividing damper according to the present embodiment. [Figure 5B] FIG. 2 is a plan view showing an example of the flow dividing damper of the present embodiment. [Figure 5C] 1 is a cross-sectional view showing an example of a flow dividing damper according to an embodiment of the present invention. [Figure 5D] 1 is a cross-sectional view showing an example of a flow dividing damper according to an embodiment of the present invention. [Figure 5E] 1 is a cross-sectional view showing an example of a flow dividing damper according to an embodiment of the present invention. [Figure 5F]1 is a cross-sectional view showing an example of a flow dividing damper according to an embodiment of the present invention. [Figure 6A] FIG. 2 is a plan view showing an example of an impeller according to the present embodiment. [Figure 6B] FIG. 2 is a side cross-sectional view showing an example of an impeller according to the present embodiment. [Figure 7] FIG. 4 is a plan view showing a detailed example of the shape of the blades according to the present embodiment. [Figure 8] FIG. 1 is an exploded perspective view showing an example of a bathroom ventilation, drying and heating appliance according to an embodiment of the present invention. [Figure 9] 5 is an explanatory diagram showing the operation of a diversion damper in the bathroom ventilation, drying and heating apparatus of the present embodiment. FIG. [Figure 10] 5 is an explanatory diagram showing the operation of a diversion damper in the bathroom ventilation, drying and heating apparatus of the present embodiment. FIG. [Figure 11] 5 is an explanatory diagram showing the operation of a diversion damper in the bathroom ventilation, drying and heating apparatus of the present embodiment. FIG. [Figure 12A] FIG. 2 is an explanatory diagram showing the flow of air in a bathroom in the bathroom ventilation, drying and heating apparatus of the present embodiment. [Figure 12B] FIG. 2 is an explanatory diagram showing the flow of air in a bathroom in the bathroom ventilation, drying and heating apparatus of the present embodiment. [Figure 13] FIG. 4 is an explanatory diagram showing an air flow. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0015] DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, an embodiment of a bathroom ventilating, drying and heating apparatus as a blower of the present invention will be described with reference to the drawings.

[0016] <Example of the configuration of the bathroom ventilation, drying and heating device according to the present embodiment> Figures 1 to 3 are configuration diagrams showing an example of a bathroom ventilator / dryer / heater according to this embodiment, with Fig. 1 being a side view showing the internal configuration of the bathroom ventilator / dryer / heater and Fig. 2 being a plan view showing the internal configuration of the bathroom ventilator / dryer / heater. Fig. 3 is a plan view with the front panel attached. Furthermore, Figs. 4A and 4B are configuration diagrams showing an example installation of the bathroom ventilator / dryer / heater according to this embodiment.

[0017] To give an overview of bathroom ventilator / dryer / heater 1A in this embodiment, bathroom ventilator / dryer / heater 1A is equipped with a circulating ventilation fan 2A that draws in and blows out air, a main body 3A in which circulating ventilation fan 2A is mounted, a front panel 4A attached to main body 3A, and a heater 5A that heats the air blown out by circulating ventilation fan 2A. Bathroom ventilator / dryer / heater 1A is attached to the ceiling of bathroom 100, where main body 3A is to be installed, with front panel 4A exposed. The side of bathroom ventilator / dryer / heater 1A where front panel 4A is attached is the underside.

[0018] Bathroom ventilator / dryer / heater 1A is described in detail below. Circulation ventilation fan 2A is an example of a blower fan composed of a centrifugal fan, and includes multi-blade impeller 25A, circulation ventilation fan motor 26A that drives impeller 25A, and circulation ventilation fan case 27A that forms an air passage. Impeller 25A is driven to rotate by circulation ventilation fan motor 26A, generating a flow of air that is blown out in the centrifugal direction from the inside of impeller 25A to the outer periphery.

[0019] The circulation ventilation fan 2A has a circulation ventilation intake 20A through which air is drawn, on the lower surface of the circulation ventilation fan case 27A. The circulation ventilation intake 20A is configured by providing a circular opening called a bellmouth below the rotation axis of the impeller 25A. The circulation ventilation fan case 27A is an example of a case portion, and has a first air passage forming portion 27A11 formed of a substantially circular portion along the outer periphery of the impeller 25A, and a second air passage forming portion 27A12 formed of a portion along the tangential direction of the impeller 25A. The shape is such that a tongue portion 27A1 is formed between the first air passage forming portion 27A11 and the second air passage forming portion 27A12.

[0020] First air passage forming section 27A11 straightens the air flow along the circumferential direction of impeller 25A. Second air passage forming section 27A12 straightens the air flow along the tangential direction of impeller 25A. This allows circulation ventilation fan case 27A to straighten the air blown out in the centrifugal direction of impeller 25A, generating a flow of air blown out along the tangential direction of impeller 25A.

[0021] Circulating ventilation fan 2A is configured so that, when bathroom ventilator, dryer and heater 1A is installed on the ceiling of bathroom 100, the rotation axis of impeller 25A is oriented vertically.

[0022] As a result, in the circulation ventilation fan 2A, an outlet airflow path 28A is formed by the circulation ventilation fan case 27A, through which air is sucked in from the circulation ventilation inlet 20A below along the rotation axis of the impeller 25A and blown out in the tangential direction of the impeller 25A.

[0023] The circulation ventilation fan 2A has a first air outlet 21A on the underside of the circulation ventilation fan case 27A, from which air heated by driving the heater 5A, or air according to the temperature in the bathroom 100, is blown out by deactivating the heater 5A.

[0024] In addition, circulation ventilation fan 2A is provided with a second air outlet 22A on the underside of circulation ventilation fan case 27A, through which air is blown out to stir the inside of bathroom 100. Furthermore, circulation ventilation fan 2A is provided with a ventilation air outlet 23A on the side surface of circulation ventilation fan case 27A, through which air is blown out to the outside.

[0025] The first air outlet 21A is an example of a circulation air outlet, and is configured as an approximately rectangular opening with a short side along the air blowing direction by the circulation ventilation fan case 27A that passes between the second air path forming portion 27A12 and the tongue portion 27A1, and a long side that intersects with the air blowing direction by the circulation ventilation fan case 27A.

[0026] Second air outlet 22A is an example of a circulation air outlet, and is configured as a substantially rectangular opening with a short side along the air blowing direction from circulation ventilation fan case 27A and a long side intersecting the air blowing direction from circulation ventilation fan case 27A. Second air outlet 22A is provided on the underside of outlet airflow passage 28A, on the opposite side of circulation ventilation intake 20A with respect to first air outlet 21A.

[0027] In main body 3A, the direction that intersects with the air blowing direction from circulation ventilation fan case 27A and runs along the long sides of first outlet 21A and second outlet 22A is referred to as the width direction. Similarly, in outlet airflow duct 28A, the direction that intersects with the air blowing direction from circulation ventilation fan case 27A and runs along the long sides of first outlet 21A and second outlet 22A is referred to as the width direction.

[0028] The length of the long sides of first air outlet 21A and second air outlet 22A is wider than the length between second air passage forming portion 27A12 and tongue portion 27A1, and is aligned with the length in the width direction of main body portion 3A.

[0029] The width of the outlet air passage 28A is expanded from the area where the tongue portion 27A1 is provided toward the area where the first air outlet 21A and the second air outlet 22A are provided, forming an air passage width expansion section 280A in which the width of the air passage is adjusted to the length of the long side of the first air outlet 21A.

[0030] Further, the width of blow-out air passage 28A is narrowed at a portion where ventilation outlet 23A is provided, and a ventilation air passage forming frame portion 281A that communicates with ventilation outlet 23A is formed. Furthermore, blow-out air passage 28A is formed with air passage height enlarged portion 282A in which the height of the air passage is enlarged toward the portion where first outlet 21A and second outlet 22A are provided, relative to the portion where tongue portion 27A1 is provided.

[0031] The first air outlet 21A and the second air outlet 22A are configured by an air-path forming frame 50A attached to the bottom surface of the circulation ventilation fan case 27A. The first air outlet 21A and the second air outlet 22A are partitioned by a partition member 51A provided in the air-path forming frame 50A, forming a circulating air outlet air path through which the air blown out from the first air outlet 21A passes, and a stirred air outlet air path through which the air blown out from the second air outlet 22A passes.

[0032] The main body 3A includes a main body chassis 30A constituting the circulation ventilation fan case 27A, and a metal case 31A covering the main body chassis 30A. The main body chassis 30A is made of a resin material, and the circulation ventilation fan case 27A covered by the metal case 31A and a flange portion 32A protruding outward from the periphery of the lower end of the main body 3A are integrally formed. In addition, a ventilation air passage forming frame portion 281A is formed integrally with the main body chassis 30A in a form that protrudes from the ventilation outlet 23A into the blow-out air passage 28A.

[0033] A bottom cover 33A is attached to the bottom surface of the main body chassis 30A. The circulation ventilation fan 2A has a circulation ventilation inlet 20A and an air passage height enlarged section 282A provided in the bottom cover 33A.

[0034] The metal case 31A has an opening facing the ventilation outlet 23A of the circulation ventilation fan 2A, and an exhaust duct joint 34A communicating with the ventilation outlet 23A is attached to the side surface.

[0035] Bathroom ventilator / dryer / heater 1A has front panel 4A attached to the underside of main body 3A. Front panel 4A has an opening on its underside facing circulation ventilation inlet 20A of circulation ventilation fan 2A to form inlet grill 40A.

[0036] In addition, the front panel 4A has an opening on its underside facing the first air outlet 21A of the circulating ventilation fan 2A to form a first air outlet grill 41A, and an opening on its underside facing the second air outlet 22A to form a second air outlet grill 42A.

[0037] The first air outlet grill 41A is configured with a rectangular opening whose length is longer along the short side direction, which is a direction along one side of the main body 3A. Similarly to the first air outlet grill 41A, the second air outlet grill 42A is configured with a rectangular opening whose length is longer along the short side direction, which is a direction along one side of the main body 3A.

[0038] The first air outlet grill 41A is provided with a straightening plate so that air is blown out along the longitudinal direction. The second air outlet grill 42A is provided with a straightening plate so that air is blown out along the lateral direction parallel to the first air outlet grill 41A toward the outside of the main body 3A, which is the opposite side to the first air outlet grill 41A.

[0039] The heater 5A is an example of a heating member, and in this example is configured as a PTC heater, which is attached to the air passage forming frame 50A and provided at the first air outlet 21A. When the heater 5A is driven and energized, the heater 5A heats up, and the air passing through the first air outlet 21A is heated, and hot air is blown out from the first air outlet 21A. The first air outlet 21A and the second air outlet 22A are partitioned by a partition member 51A, and the air blown out from the second air outlet 22A does not pass through the heater 5A.

[0040] Bathroom ventilator / dryer / heater 1A is equipped with flow dividing damper 6A that divides the air flow between first and second air outlets 21A and 22A, and ventilation air outlet 23A. Flow dividing damper 6A is an example of a flow dividing member, and receives the driving force of a damper motor (not shown), rotates about shaft 60A as a fulcrum, and opens and closes first and second air outlets 21A and 22A, and ventilation air outlet 23A.

[0041] The flow dividing damper 6A has a rotating shaft 60A provided above and at a predetermined distance from a partition member 51A that separates the first air outlet 21A and the second air outlet 22A. The circulation ventilation fan 2A has a second air outlet inlet section 24A that connects the air outlet passage 28A and the second air outlet 22A in a gap formed between the shaft 60A and the partition member 51A. The shaft 60A intersects with the air flow in a direction that is approximately perpendicular to the air flow.

[0042] The flow dividing damper 6A includes a first air outlet opening / closing section 61A that opens and closes the first air outlet 21A, and a second air outlet opening / closing section 62A that opens and closes the second air outlet 22A and the second air outlet inlet section 24A. The flow dividing damper 6A also includes a backflow prevention section 63A at the tip side of the second air outlet opening / closing section 62A, which contacts the wall surface of the second air outlet 22A to maintain airtightness.

[0043] The flow dividing damper 6A includes a first air outlet opening / closing section 61A at a portion extending from the axis 60A to the upstream side in the air flow direction. The first air outlet opening / closing section 61A is an example of an air outlet opening / closing section. The flow dividing damper 6A includes a second air outlet opening / closing section 62A at a portion extending from the axis 60A to the downstream side in the air flow direction.

[0044] In the flow diverter damper 6A, a lower surface 64A, which is one surface of the first air outlet opening / closing part 61A that divides the air flow in the direction of the first air outlet 21A, is configured as a concave surface along the direction of the air flow. In addition, in the flow diverter damper 6A, an upper surface 65A, which is the other surface of the first air outlet opening / closing part 61A that divides the air flow in the direction of the ventilation air outlet 23A, is configured as a convex surface that matches the shape of the lower surface 64A.

[0045] The flow dividing damper 6A rotates about the shaft 60A, and the first air outlet opening / closing section 61A is displaced in a direction to open and close the first air outlet 21A. Also, the flow dividing damper 6A rotates about the shaft 60A, and the second air outlet opening / closing section 62A is displaced in a direction to open and close the second air outlet 22A and the second air outlet inlet section 24A.

[0046] When the flow dividing damper 6A opens the first air outlet 21A and moves in a direction to close the ventilation air outlet 23A, the tip 610A of the first air outlet opening / closing part 61A moves upward by a rotational motion about the shaft 60A as a fulcrum.

[0047] When the tip 610A of the first air outlet opening / closing section 61A moves to a predetermined position in the upward direction, the flow diversion damper 6A is in a state where a predetermined airtightness is maintained between the tip 610A of the first air outlet opening / closing section 61A and the upper inner surface 270A of the circulation ventilation fan case 27A, which is one surface of the main body chassis 30A. The position of the flow diversion damper 6A where a predetermined airtightness is maintained between the tip 610A of the first air outlet opening / closing section 61A and the upper inner surface 270A of the circulation ventilation fan case 27A is referred to as the circulation position.

[0048] In this example, as shown by the solid line in Figure 1, the tip 610A of the first air outlet opening / closing portion 61A is in contact with the upper inner surface 270A of the circulation ventilation fan case 27A, thereby maintaining a predetermined airtightness between the tip 610A of the first air outlet opening / closing portion 61A and the upper inner surface 270A of the circulation ventilation fan case 27A.

[0049] In addition, when the flow diversion damper 6A moves in a direction to close the first air outlet 21A and open the ventilation air outlet 23A, the tip 610A of the first air outlet opening / closing portion 61A moves downward by a rotational motion about the axis 60A as a fulcrum.

[0050] When the tip 610A of the first air outlet opening / closing section 61A moves to a predetermined position in the downward direction, the flow diverter damper 6A is in a state where a predetermined airtightness is maintained between the tip 610A of the first air outlet opening / closing section 61A and the inner surface 330A of the lower cover 33A constituting the other surface of the main body chassis 30A. The position of the flow diverter damper 6A where a predetermined airtightness is maintained between the tip 610A of the first air outlet opening / closing section 61A and the inner surface 330A of the lower cover 33A is referred to as the ventilation position.

[0051] In this example, as shown by the dotted line in Figure 1, the tip 610A of the first air outlet opening / closing portion 61A and the inner surface 330A of the lower cover 33A are in contact with each other, thereby maintaining a predetermined airtightness between the tip 610A of the first air outlet opening / closing portion 61A and the inner surface 330A of the lower cover 33A.

[0052] Furthermore, when the first air outlet opening / closing section 61A of the flow diversion damper 6A is displaced in the direction of opening both the first air outlet 21A and the ventilation air outlet 23A, the flow diversion damper 6A rotates about the axis 60A as a fulcrum, and as shown by the dashed line in Figure 1, the tip 610A of the first air outlet opening / closing section 61A is positioned halfway between the upper inner surface 270A of the circulation ventilation fan case 27A and the inner surface 330A of the lower cover 33A.

[0053] The state in which tip 610A of first air outlet opening / closing portion 61A is positioned midway between upper inner surface 270A of circulation ventilation fan case 27A and inner surface 330A of lower cover 33A is referred to as the circulation ventilation position of flow diversion damper 6A.

[0054] When the flow dividing damper 6A moves to the circulation position, the first air outlet opening / closing part 61A opens the first air outlet 21A. The first air outlet opening / closing part 61A also divides the air outlet passage 28A, and closes the ventilation air outlet 23A.

[0055] Furthermore, in the diversion damper 6A, the first air outlet opening / closing section 61A and the second air outlet opening / closing section 62A are displaced together, and in the circulation position, the second air outlet opening / closing section 62A closes the second air outlet inlet section 24A, thereby closing the air path from the outlet air passage 28A to the second air outlet 22A.

[0056] Here, the ventilation air passage forming frame 281A opens in a shape that matches the upper surface 65A of the first air outlet opening / closing part 61A of the flow dividing damper 6A in the circulation position. As a result, when the flow dividing damper 6A moves to the circulation position, the air passage from the ventilation air outlet 23A to the second air outlet 22A is closed. As a result, the first air outlet 21A opens, the second air outlet 22A and the ventilation air outlet 23A are closed, and a circulation air passage that communicates from the circulation ventilation inlet 20A to the first air outlet 21A is formed.

[0057] When the flow dividing damper 6A moves to the ventilation position, the first air outlet opening / closing part 61A closes the first air outlet 21A. Also, the first air outlet opening / closing part 61A retreats from the air outlet passage 28A, and opens the ventilation air outlet 23A.

[0058] Furthermore, in the ventilation position, the flow dividing damper 6A has the backflow prevention portion 63A of the second air outlet opening / closing portion 62A in contact with the wall surface of the second air outlet 22A, and the second air outlet opening / closing portion 62A closes the second air outlet 22A. This opens the ventilation air outlet 23A and closes the first air outlet 21A and the second air outlet 22A, forming a ventilation air passage.

[0059] In contrast, when the flow dividing damper 6A is moved to the circulation ventilation position, the first air outlet opening / closing part 61A is positioned near the middle in the vertical direction of the air outlet passage 28A, and both the first air outlet 21A and the ventilation air outlet 23A are opened.

[0060] When the flow dividing damper 6A moves to the circulation ventilation position, a ventilation air passage that communicates from the blow-out air passage 28A to the ventilation air outlet 23A is formed along the upper surface 65A of the first air outlet opening / closing part 61A. In addition, when the second air outlet opening / closing part 62A opens the second air outlet 22A, a circulation air passage that communicates from the blow-out air passage 28A to the second air outlet 22A is formed along the upper surface 65A of the first air outlet opening / closing part 61A.

[0061] Furthermore, when the flow dividing damper 6A moves to the circulation ventilation position, the second air outlet opening / closing part 62A opens the second air outlet inlet part 24A, and a circulation air passage that communicates from the air outlet passage 28A to both the first air outlet 21A and the second air outlet 22A is formed along the lower surface 64A of the first air outlet opening / closing part 61A. As a result, both the first air outlet 21A and the second air outlet 22A and the ventilation air outlet 23A are opened, and both the circulation air passage and the ventilation air passage are formed.

[0062] Therefore, in the bathroom ventilation, drying and heating unit 1A, a single circulating ventilation fan 2A draws in air from within the bathroom 100, blows the drawn in air out into the bathroom 100, exhausts the drawn in air to the outside, and blows out some of the drawn in air into the bathroom 100 and exhausts the remainder to the outside.

[0063] Moreover, in bathroom ventilator / dryer / heater 1A, one branch damper 6A opens and closes first air outlet 21A, second air outlet 22A, and ventilation air outlet 23A.

[0064] Fig. 5A is a perspective view showing an example of the diversion damper of this embodiment, Fig. 5B is a plan view showing an example of the diversion damper of this embodiment, and Figs. 5C, 5D, 5E, and 5F are cross-sectional views showing an example of the diversion damper of this embodiment. Here, Fig. 5C is an AA cross-sectional view of the diversion damper shown in Fig. 5B, Fig. 5D is a BB cross-sectional view of the diversion damper shown in Fig. 5B, Fig. 5E is a CC cross-sectional view of the diversion damper shown in Fig. 5B, and Fig. 5F is a DD cross-sectional view of the diversion damper shown in Fig. 5B.

[0065] The flow dividing damper 6A includes an inflow restriction portion 66A that restricts the flow of air in the air passage width expansion portion 280A. The inflow restriction portion 66A is provided on the lower surface 64A of the first air outlet opening / closing portion 61A. The lower surface 64A of the first air outlet opening / closing portion 61A is concave, and the inflow restriction portion 66A is configured to have a substantially flat shape protruding from this concave surface.

[0066] In the flow diversion damper 6A, a flow diversion guide surface 67A that guides the air diverted to the first air outlet 21A is formed on a lower surface 64A of a non-forming portion of the first air outlet opening / closing portion 61A where no inflow restricting portion 66A is provided.

[0067] The flow diversion damper 6A is configured so that the width LB of the flow diversion guide surface 67A is approximately equal to the length between the tongue portion 27A1 and the second air passage forming portion 27A12 on the tip 610A side of the first air outlet opening / closing portion 61A, and is approximately equal to the width of the first air outlet 21A on the axis 60A side.

[0068] For this reason, the inflow regulating portion 66A is configured in a shape such that the width LC of the inflow regulating portion 66A narrows from the tip 610A of the first air outlet opening / closing portion 61A toward the axis 60A, and on the tip 610A side of the first air outlet opening / closing portion 61A, which is upstream of the air flow, it regulates the air flow that spreads in the direction along the axis 60A.

[0069] Fig. 6A is a plan view showing an example of an impeller of this embodiment, and Fig. 6B is a side cross-sectional view showing an example of an impeller of this embodiment. Impeller 25A includes multi-blade blade portion 250A and blade support portion 251A on which blade portion 250A is provided. Blade portion 250A has a predetermined height along the rotation axis direction of impeller 25A and a predetermined width along the radial direction of impeller 25A, and is provided with multiple blades 252A that are inclined forward with respect to the rotation direction of impeller 25A indicated by arrow F.

[0070] The blade portion 250A is configured such that a plurality of blades 252A are erected on one side of the blade support portion 251A along the rotational axis direction of the impeller 25A and are arranged in parallel in the circumferential direction along the outer periphery of the blade support portion 251A.

[0071] The blade support portion 251A is configured in a convex shape to receive a motor case 260A that covers the circulation ventilation fan motor 26A shown in Fig. 1. The blade support portion 251A includes an air inlet hole 253A through which air passes.

[0072] Air inlet hole 253A is configured with a plurality of openings penetrating blade support portion 251A arranged in parallel in the circumferential direction of impeller 25A. Air inlet hole 253A has a downstream side 254A with respect to the rotation direction of impeller 25A indicated by arrow F, which is inclined in a predetermined direction with respect to the air flow direction. In this example, side 254A of air inlet hole 253A is inclined in a direction in which the radially outer side recedes from the radially inner side. Air inlet hole 253A has an upstream side 255A with respect to the rotation direction of impeller 25A, which is also inclined in a direction in which the radially outer side recedes from the radially inner side.

[0073] In the blade support portion 251A, the side 254A of the air inlet hole 253A is the upstream side in the rotation direction of the impeller 25A, and the side 255A of the adjacent air inlet hole 253A is the downstream side in the rotation direction of the impeller 25A.

[0074] As a result, the impeller 25A, the blade support portion 251A, is also inclined in a direction in which the outer side is receding radially from the inner side, and the upstream side and downstream side extend approximately parallel to the rotation direction of the impeller 25A, thereby ensuring the opening area necessary for cooling the circulation ventilation fan motor 26A.

[0075] 7 is a plan view showing a detailed example of the shape of the blade of this embodiment. In specifying the shape of the blade 252A, the inlet angle of the blade 252A is called β1, the outlet angle of the blade 252A is called β2, the inner diameter of the blade 252A is called D1, and the outer diameter of the blade 252A is called D2. L The inclination angle from the center is called θ, the length of the blade 252A is called L, and the thickness of the blade 252A is called t.

[0076] The inlet angle β1 of the blade 252A is the angle between the blade 252A near the inner diameter and a tangent C11 to a first imaginary circle C1 defined by the inner diameter D1 of the blade 252A. The outlet angle β2 of the blade 252A is the angle between the blade 252A near the outer diameter and a tangent C12 to a second imaginary circle C2 defined by the outer diameter D2 of the blade 252A.

[0077] It is preferable that blade 252A has inlet angle β1 of 60° or more and 80° or less, and outlet angle β2 of 130° or more and 150° or less. In bathroom ventilator, dryer and heater 1A, it is assumed that outer diameter D2 of blade 252A is approximately 150 mm or more and 200 mm or less, length L of blade 252A is approximately 10 mm or more and 20 mm or less, and thickness t of blade 252A is approximately 1 mm or more and 2 mm or less. It is also preferable that tilt angle θ of blade 252A is approximately -5° or more and 30° or less.

[0078] Figure 8 is an exploded perspective view showing an example of the bathroom ventilator / dryer / heater of this embodiment. Bathroom ventilator / dryer / heater 1A is equipped with terminal block 8A to which an external power line (not shown) is connected. Terminal block 8A is provided at one end of terminal block support part 80A, the other end of which is rotatably supported by main body part 3A by shaft 81A.

[0079] The terminal block 8A has a gripping portion 82A on the terminal block support portion 80A, and the orientation of the terminal block 8A can be changed from one side of the main body 3A to one side by operating it from the other side of the main body 3A. This makes it easy to change the orientation of the terminal block 8A after the main body 3A is installed.

[0080] Bathroom ventilating / dryering heater 1A is equipped with terminal block cover 83A that covers terminal block 8A and terminal block support part 80A. Terminal block cover 83A is made of metal and is attached to the top surface of metal case 31A. The position of terminal block cover 83A facing shaft 81A of terminal block support part 80A is sealed with a sealing member (not shown) to prevent the intrusion of moisture, etc.

[0081] Bathroom ventilator / dryer / heater 1A includes board 9A on which the drive section of circulating ventilation fan motor 26A is mounted, board cover 90A that covers the periphery of board 9A, and board chassis 91A that covers the underside of board 9A. Board 9A is attached to main body chassis 30A via board chassis 91A. Board chassis 91A is made of metal.

[0082] The board cover 90A is made of flame-retardant resin and has a shape that covers the side of the board 9A. The board cover 90A includes a wiring guide 92A that holds and guides wiring (not shown) along the outer periphery. The board cover 90A also includes a wall 93A that covers the periphery of the shaft 81A of the terminal block support 80A. The terminal block 8A has a structure in which the terminal block support 80A can rotate around the shaft 81A, and an opening to allow the rotation of the terminal block support 80A needs to be provided in the metal case 31A. Therefore, by providing the wall 93A that covers the periphery of the shaft 81A of the terminal block support 80A in the board cover 90A, the intrusion of moisture, dust, and the like into the inside of the metal case 31A is suppressed.

[0083] <Installation example of the bathroom ventilation / drying / heating device according to this embodiment> Next, with reference to the respective drawings, an example of installation of bathroom ventilator / dryer / heater 1A of this embodiment will be described.

[0084] Bathroom ventilator / dryer / heater 1A is installed on ceiling panel 101 of bathroom 100, as shown in Figures 4A and 4B. An opening is formed in ceiling panel 101 of bathroom 100 into which main body 3A of bathroom ventilator / dryer / heater 1A can be attached, and bathroom ventilator / dryer / heater 1A is attached to ceiling panel 101 by, for example, fixing flange portion 32A to a reinforcing member provided in the ceiling space with screws (not shown).

[0085] The bathroom ventilation, drying and heating appliance 1A has a front panel 4A attached to the underside of the main body 3A, and the air inlet grill 40A, first air outlet grill 41A and second air outlet grill 42A of the front panel 4A are positioned facing the inside of the bathroom 100.

[0086] Bathroom ventilator / dryer / heater 1A is installed on ceiling panel 101 of bathroom 100, and has exhaust duct 102 attached to exhaust duct joint 34A of main body 3A. Exhaust duct 102 is connected to outdoor grill 102a attached to the outer wall of a building (not shown) in which bathroom 100 is installed, and bathroom ventilator / dryer / heater 1A is connected to the outdoors via exhaust duct 102.

[0087] Bathroom 100 includes a bathtub 103 and a washing area 104. Bathtub 103 is generally rectangular, and bathtub 103 and washing area 104 are aligned along the short side of bathtub 103.

[0088] Bathroom 100 is equipped with a laundry pipe 105, which is a drying member, above bathtub 103. Laundry pipe 105 extends along the longitudinal direction of bathtub 103 and is attached between bathroom 100's opposing walls 106a and 106b.

[0089] The number of laundry pipes 105 installed in the bathroom 100 is about one or two, and this example shows an example in which one laundry pipe 105 is installed. Also, the laundry drying member is not limited to a pipe-shaped member, and may be a string-shaped member or other member as long as it can dry items such as laundry.

[0090] Bathroom ventilator / dryer / heater 1A is installed above bathtub 103 with the longitudinal direction of first air outlet grill 41A and second air outlet grill 42A perpendicular to the longitudinal direction of laundry pipe 105.

[0091] As a result, in bathroom ventilator / dryer / heater 1A, the air blown out from first air outlet grill 41A spreads mainly in a direction perpendicular to laundry pipe 105. In contrast, the air blown out from second air outlet grill 42A is directed toward wall 106a of bathroom 100 on the side where second air outlet grill 42A is provided.

[0092] <Example of operation of the bathroom ventilation, drying and heating device according to the present embodiment> Figures 9 to 11 are explanatory diagrams showing the operation of the flow diverter damper in the bathroom ventilator / dryer / heater of this embodiment, and Figures 12A and 12B are explanatory diagrams showing the air flow in the bathroom in the bathroom ventilator / dryer / heater of this embodiment. Next, with reference to these figures, an example of the operation of bathroom ventilator / dryer / heater 1A of this embodiment will be described.

[0093] In the heating operation mode, bathroom ventilator / dryer / heater 1A places flow diverter damper 6A in the circulation position shown in FIG. 9, energizes heater 5A, and drives circulation ventilation fan motor 26A to rotate impeller 25A.

[0094] In bathroom ventilator / dryer / heater 1A, as impeller 25A rotates, air within bathroom 100 is drawn into circulation ventilation inlet port 20A through inlet port grill 40A in front panel 4A.

[0095] In the heating operation mode, because diverter damper 6A is in the circulation position, substantially all of the air in bathroom 100 sucked in through circulation ventilation inlet 20A flows to first air outlet 21A. In the heating operation mode, the air flowing through first air outlet 21A is heated by heater 5A, and warm air is blown out from first air outlet grill 41A of front panel 4A.

[0096] In the heating operation mode, because diverter damper 6A is in the circulation position, the air in bathroom 100 is not ventilated. As a result, in the heating operation mode, warm air is blown out from first air outlet grille 41A while the air in bathroom 100 is circulated, thereby raising the temperature in bathroom 100 to a temperature suitable for bathing.

[0097] Furthermore, when the flow dividing damper 6A is in the circulation position, the second outlet inlet 24A is blocked in addition to the ventilation outlet 23A, so that air that does not pass through the heater 5A is not blown out from the second outlet 22A. As a result, even in the heating operation mode executed while taking a bath, air that has not been heated by the heater 5A is not blown out, so the bather does not feel cold.

[0098] Furthermore, when the diversion damper 6A is in the circulation position, the ventilation air passage forming frame portion 281A communicating with the ventilation outlet 23A is blocked by the diversion damper 6A, thereby preventing outside air from flowing back into the bathroom 100 from the second outlet 22A.

[0099] 13 is an explanatory diagram showing the air flow, and next, the action and effect of the flow diverter damper 6A of this embodiment will be described. When the flow diverter damper 6A moves to the circulation position, the lower surface 64A of the first air outlet opening / closing section 61A faces the circulation air passage. In the flow diverter damper 6A, a flow diverter guide surface 67A provided on the lower surface 64A of the first air outlet opening / closing section 61A is configured as a concave surface aligned with the air flow direction, and an inflow restricting section 66A is configured in a shape that protrudes from the flow diverter guide surface 67A toward the circulation air passage side.

[0100] The inflow restriction portion 66A is configured in a shape in which the width of the inflow restriction portion 66A narrows from the tip 610A of the first air outlet opening / closing portion 61A toward the axis 60A, and the width of the diversion guide surface 67A is configured to be approximately equal to the length between the tongue portion 27A1 and the second air passage forming portion 27A12 on the tip 610A side of the first air outlet opening / closing portion 61A, and approximately equal to the width of the first air outlet 21A on the axis 60A side.

[0101] 13, the air flow passing between second air-path forming portion 27A12 and tongue portion 27A1 is expanded by flow-diversion guide surface 67A, and as shown by arrows W2L and W2R, the air passes over the entire width of first air outlet 21A, suppressing an increase in airflow resistance. Also, the volume of air-path width expansion portion 280A is reduced by inflow restriction portion 66A, and air does not easily flow in air-path width expansion portion 280A other than the portion where first air outlet 21A is provided, so that the air passing between second air-path forming portion 27A12 and tongue portion 27A1 is prevented from becoming turbulent in air-path width expansion portion 280A by inflow restriction portion 66A, as shown by dashed arrow W3 in FIG. Furthermore, the air flow passing between second air-passage forming portion 27A12 and tongue portion 27A1 is also expanded by air-passage height enlarging portion 282A, suppressing an increase in ventilation resistance.

[0102] Therefore, a predetermined air volume can be secured without increasing the rotation speed of the circulation ventilation fan motor 26A, and an increase in noise caused by increasing the rotation speed of the circulation ventilation fan motor 26A can be suppressed. Compared to a configuration equipped with a conventional flow dividing damper that does not have the inflow restriction portion 66A, the sound volume can be reduced by about 0.2 dB to 0.3 dB.

[0103] Regarding the other operating modes of bathroom ventilator / dryer / heater 1A, in ventilation operation mode, bathroom ventilator / dryer / heater 1A places diversion damper 6A in the ventilation position shown in Figure 10, deactivates heater 5A, and drives circulating ventilation fan motor 26A to rotate impeller 25A.

[0104] In bathroom ventilator / dryer / heater 1A, as impeller 25A rotates, air within bathroom 100 is drawn into circulation ventilation inlet port 20A through inlet port grill 40A in front panel 4A.

[0105] In ventilation operation mode, because diversion damper 6A is in the ventilation position, first air outlet 21A and second air outlet 22A are blocked, and substantially all of the air in bathroom 100 sucked in through circulation ventilation inlet 20A flows through ventilation air outlet 23A and is exhausted to the outdoors. Therefore, in ventilation operation mode, steam and moisture are exhausted from inside bathroom 100, suppressing condensation and the like, and preventing the growth of mold.

[0106] In the drying operation mode, bathroom ventilator / dryer / heater 1A places flow diverter damper 6A in the circulating ventilation position shown in FIG. 11, drives circulating ventilation fan motor 26A to rotate impeller 25A, and energizes heater 5A.

[0107] In bathroom ventilator / dryer / heater 1A, when impeller 25A rotates, air within bathroom 100 is drawn into circulation ventilation inlet port 20A through inlet port grill 40A in front panel 4A.

[0108] In the drying operation mode, the diversion damper 6A is in the circulation ventilation position, so that in the outlet air passage 28A, both a circulation air passage communicating from the circulation ventilation intake port 20A to the first outlet port 21A and the second outlet port 22A, and a ventilation air passage communicating from the circulation ventilation intake port 20A to the ventilation outlet port 23A are formed.

[0109] As a result, as impeller 25A rotates, part of the air RA from bathroom 100 that is sucked in through circulation ventilation inlet 20A flows to first outlet 21A and second outlet 22A. The rest of the air from bathroom 100 that is sucked in through circulation ventilation inlet 20A flows to ventilation outlet 23A, passes through exhaust duct 102, and is exhausted to the outdoors from outdoor grill 102a as exhaust air EA.

[0110] In the drying operation mode, the air flowing through the first air outlet 21A is heated by the heater 5A, and warm air HA is blown out from the first air outlet grill 41A of the front panel 4A. The air flowing through the second air outlet 22A does not pass through the heater 5A, and therefore air A according to the room temperature is blown out from the second air outlet grill 42A of the front panel 4A.

[0111] In bathroom ventilator / dryer / heater 1A, the air blown out from first air outlet grille 41A spreads out in the longitudinal direction of laundry pipe 105 and in a direction perpendicular to laundry pipe 105.

[0112] However, since bathroom ventilator / dryer / heater 1A is positioned so that the longitudinal direction of first air outlet grill 41A is perpendicular to laundry pipe 105, the air blown out from first air outlet grill 41A spreads mainly in a direction perpendicular to laundry pipe 105.

[0113] Therefore, the hot air is applied to the entire width of the article to be dried, such as clothes, hung on the laundry pipe 105 in the vicinity of directly below the first air outlet grill 41A. On the other hand, the hot air blown out from the first air outlet grill 41A is unlikely to directly hit the article to be dried hung on the laundry pipe 105 at a position away from directly below the first air outlet grill 41A.

[0114] In bathroom ventilator / dryer / heater 1A, air A blown out from second air outlet grill 42A is directed toward wall surface 106a of bathroom 100 on the side where second air outlet grill 42A is provided relative to first air outlet grill 41A.

[0115] 12A, air A blown out from second air outlet grille 42A in drying mode hits one wall surface 106a of bathroom 100 and flows downward along wall surface 106a as indicated by arrow A1. The air flowing downward along wall surface 106a flows mainly toward the other wall surface 106b near the lower level of bathroom 100 as indicated by arrow A2.

[0116] In the bathroom ventilation / drying / heating unit 1A, air RA is sucked in through the air inlet grill 40A, creating a flow that circulates air within the bathroom 100, so that air flowing near the lower level of the bathroom 100 toward the other wall surface 106b flows upward along wall surface 106b, as shown by arrow A3, and is sucked in through the air inlet grill 40A.

[0117] In this way, in the bathroom ventilation / drying / heating unit 1A, the air blown out from the second air outlet grill 42A can generate an air flow that flows downward along one wall surface 106a of the bathroom 100, toward the other wall surface 106b near the lower level of the bathroom 100, and then upward along the other wall surface 106b.

[0118] In the drying operation mode, the air blown out from first air outlet grill 41A of bathroom ventilator / dryer / heater 1A is warm air heated by heater 5A and has a reduced relative humidity, so is lighter than the air blown out from second air outlet grill 42A.

[0119] As a result, the air blown out from the second air outlet grill 42A, which is heavier than the air blown out from the first air outlet grill 41A, flows to the lower levels of the bathroom 100, creating a wind flow that stirs the air throughout the bathroom 100.

[0120] This allows an air flow to be generated near the items to be dried hung on the laundry pipe 105 at a position away from directly below the first air outlet grill 41A, where the hot air blown out from the first air outlet grill 41A is unlikely to hit directly.

[0121] In addition, when the diversion damper 6A moves to the circulation ventilation position, the second air outlet opening / closing portion 62A opens the second air outlet 22A, thereby forming a circulation air passage that communicates from the air outlet passage 28A to the second air outlet 22A along the upper surface 65A of the first air outlet opening / closing portion 61A.

[0122] Furthermore, when the diversion damper 6A moves to the circulation ventilation position, the second air outlet opening / closing portion 62A opens the second air outlet inlet portion 24A, thereby forming a circulation air passage that communicates from the air outlet passage 28A to both the first air outlet 21A and the second air outlet 22A along the underside 64A of the first air outlet opening / closing portion 61A.

[0123] As a result, air flowing along the upper surface 65A of the first air outlet opening / closing portion 61A of the flow dividing damper 6A and air flowing along the lower surface 64A are blown out from the second air outlet 22A, and the wind speed can be increased.

[0124] Furthermore, even when the flow diversion damper 6A is moved to the circulation ventilation position, the flow of air passing between the second air-path forming portion 27A12 and the tongue portion 27A1 is expanded by the flow diversion guide surface 67A, and the air passes over the entire width of the first air outlet 21A, suppressing an increase in the airflow resistance. Also, the inflow restriction portion 66A suppresses the air passing between the second air-path forming portion 27A12 and the tongue portion 27A1 from becoming turbulent at the air-path width expansion portion 280A.

[0125] Therefore, a predetermined air volume and speed can be secured for the air blown out from the second air outlet 22A without increasing the rotation speed of the circulation ventilation fan motor 26A, and the increase in noise that accompanies increasing the rotation speed of the circulation ventilation fan motor 26A can be suppressed.

[0126] In the circulation ventilation operation mode, bathroom ventilator / dryer / heater 1A places diverter damper 6A in the circulation ventilation position shown in Fig. 11, puts heater 5A in a non-operating state, and drives circulation ventilation fan motor 26A to rotate impeller 25A. In the above-mentioned drying operation mode and circulation ventilation operation mode, the opening of diverter damper 6A may be changed to a position that widens the opening of ventilation outlet 23A so that the ventilation air volume, which is the volume of air exhausted to the outdoors, is greater in the circulation ventilation operation mode.

[0127] In bathroom ventilator / dryer / heater 1A, as impeller 25A rotates, air within bathroom 100 is drawn into circulation ventilation inlet port 20A through inlet port grill 40A in front panel 4A.

[0128] In the circulation ventilation operation mode, because flow diverter damper 6A is in the circulation ventilation position, some of the air from bathroom 100 sucked in through circulation ventilation inlet 20A flows to first outlet 21A and second outlet 22A. The rest of the air from bathroom 100 sucked in through circulation ventilation inlet 20A flows to ventilation outlet 23A and is exhausted to the outdoors.

[0129] In the circulation ventilation operation mode, the air flowing through the first air outlet 21A is blown out from the first air outlet grill 41A of the front panel 4A as the heater 5A is not driven, and the air flowing through the second air outlet 22A does not pass through the heater 5A, and the air A flowing out from the second air outlet grill 42A of the front panel 4A as the room temperature.

[0130] In the bathroom ventilation / drying / heating unit 1A, even in the circulating ventilation operation mode, as shown in Figure 12B, the air blown out from the second air outlet grill 42A can generate an air flow that flows downward along one wall surface 106a of the bathroom 100, toward the other wall surface 106b near the lower level of the bathroom 100, and then upward along the other wall surface 106b.

[0131] As a result, even in the circulating ventilation operation mode, a wind flow that stirs the air can be created throughout the bathroom 100, and air flows can be created even in places in the bathroom 100 that are unlikely to be directly hit by the air blown out from the first air outlet grill 41A.

[0132] This reduces the time it takes to dry the walls, floor, etc. of the bathroom 100. Also, some of the air in the bathroom 100 is exhausted to the outside for ventilation, which expels moisture and promotes the drying of the walls, floor, etc. of the bathroom 100.

[0133] In addition, a portion of the air flowing in the direction of the second air outlet 22A may be configured to flow onto the inner surface of the front panel 4A. By using such a configuration, it is possible to suppress the accumulation of condensation water, etc., that occurs on the inner surface of the front panel 4A.

[0134] Next, the effect of the impeller 25A of this embodiment will be described. The impeller 25A has a blade support portion 251A that is recessed to receive a motor case 260A that covers the circulation ventilation fan motor 26A, and the blades 252A are provided upright along the outer periphery of the blade support portion 251A.

[0135] In this way, because blade support part 251A is located inside the upper part of blade 252A supported by blade support part 251A, air does not easily flow to the upper part of blade 252A, and in a configuration in which blade support part 251A does not have an air inlet hole through which air can pass, air does not pass over the entire height of blade 252A, and ventilation resistance increases.

[0136] In contrast, by providing an air inlet hole through which air can pass in the blade support portion 251A, air can pass through the entire height direction of the blade 252A, and the ventilation resistance is reduced. However, in a conventional configuration in which the downstream side of the air inlet hole is approximately perpendicular to the direction of air flow with respect to the rotation direction of the impeller, air hits the downstream side of the air inlet hole in a concentrated manner, increasing the ventilation resistance. In addition, the increased ventilation resistance generates so-called wind noise and pulsating noise.

[0137] Therefore, in the impeller 25A of this embodiment, as shown in FIG. 6A, the side 254A on the downstream side of the air inlet hole 253A is inclined in a predetermined direction with respect to the direction of air flow with respect to the rotation direction of the impeller 25A indicated by the arrow F. In this example, the radially outer side is inclined in a direction receding with respect to the radially inner side. This prevents air from concentrating on the side 254A on the downstream side of the air inlet hole 253A when the impeller 25A rotates, and prevents an increase in ventilation resistance. In addition, air passes between the blades 252A over the entire height direction of the blades 252A. Furthermore, the generation of wind noise and pulsating noise is suppressed. And, the air volume can be secured without increasing the rotation speed of the impeller 25A, the generation of noise can be suppressed, and the air passing through the air inlet hole 253A becomes easier to flow, improving the cooling capacity of the circulation ventilation fan motor 26A.

[0138] Next, the effect of the shape of blade 252A will be described. In bathroom ventilator / dryer / heater 1A, air drawn into circulating ventilation fan 2A from circulating ventilation inlet 20A passes through a filter. However, dust and other particles that cannot be captured by the filter may adhere to blades 252A of impeller 25A. When dust and other particles adhere to the blades, the centrifugal force generated by the rotation of the impeller may cause the dust to peel off, and clumps of dust may fall from the air outlet. In addition, when dust and other particles adhere to the blades, the resistance to the air passing between the blades increases, and the air volume may decrease. In order to prevent the decrease in air volume, it is necessary to increase the rotation speed of the impeller, which results in increased noise.

[0139] Therefore, it is preferable that the inlet angle β1 of the blades 252A of the impeller 25A is 60° or more and 80° or less, and the outlet angle β2 is 130° or more and 150° or less, as shown in Fig. 7. When the inlet angle β1 and the outlet angle β2 are in the above-mentioned ranges, adhesion of dust to the blades 252A is suppressed. Compared to a configuration using a conventional impeller with an inlet angle β1 of 90° and an outlet angle β2 of 160°, assuming that the amount of dust adhesion to the blades of the conventional impeller is 100%, the amount of dust adhesion can be reduced to about 30% to 70%.

[0140] In this way, the adhesion of dust and the like to the blades 252A can be reduced, so that the accumulation of dust and the formation of dust lumps can be suppressed, and the dust lumps can be suppressed from falling from the air outlet. In addition, the amount of dust that adheres to the blades 252A can be reduced, so that the increase in the weight of the impeller 25A due to the accumulation of dust and the deviation of the center of gravity of the impeller 25A can be suppressed, and the generation of vibrations and noise when the impeller 25A rotates can be suppressed. Furthermore, the increase in the ventilation resistance of the air passing between the blades 252A is suppressed, and the air volume can be secured without increasing the rotation speed of the impeller 25A, and the generation of noise can be suppressed.

[0141] Furthermore, when the inlet angle β1 and the outlet angle β2 are within the above-mentioned ranges, a predetermined air volume can be secured without increasing the rotation speed of the circulation ventilation fan motor 26A, and the generation of noise associated with increasing the rotation speed of the circulation ventilation fan motor 26A can be suppressed. [Explanation of symbols]

[0142] 1A···Bathroom ventilation / drying / heating machine (blower), 2A···Circulation ventilation fan (blower fan), 20A···Circulation ventilation intake (intake), 21A···First air outlet (circulation air outlet), 22A···Second air outlet (circulation air outlet), 23A···Ventilation air outlet, 25A···Impeller, 250A···Blade section, 251A···Blade support section, 252A···Blade, 2 53A...air inlet hole, 254A...side portion, 255A...side portion, 26A...circulation ventilation fan motor, 260A...motor case, 27A...circulation ventilation fan case (case portion), 27A1...tongue portion, 27A11...first air passage forming portion, 27A12...second air passage forming portion, 270A...inner surface, 28...blowout air passage, 280A... Air passage width expansion section, 281A···ventilation air passage forming frame section, 282A···air passage height expansion section, 3A···main body section, 30A···main body chassis, 31A···metal case, 32A···flange section, 33A···bottom cover, 330A···inner surface, 4A···front panel, 40A···intake grille, 41A···first air outlet grille, 42A···second air outlet outlet grill, 5A··· heater, 6A··· flow dividing damper (flow dividing member), 60A··· shaft, 61A··· first air outlet opening / closing section (air outlet opening / closing section), 62A··· second air outlet opening / closing section, 63A··· backflow prevention section, 64A··· bottom surface (first surface), 65A··· top surface, 66A··· inflow restriction section, 67A··· flow dividing guide surface, 610A··· tip, 100··· bathroom

Claims

1. A fan that sucks in air and blows it out, a filter through which air drawn into the blower fan passes, The blower fan is The fan is configured as a centrifugal fan having a rotationally driven impeller and a case portion that rectifies the flow of air generated by the impeller, The impeller comprises: The impeller has a plurality of blades arranged in parallel along a circumferential direction thereof, the blade has an inlet angle of 60° or more and 80° or less, which is an angle between a tangent to a first imaginary circle defined by an inner diameter of the blade and the blade in the vicinity of the inner diameter, an outlet angle of the blade of 130° or more and 150° or less, which is an angle between a tangent to a second imaginary circle defined by an outer diameter of the blade and the blade in the vicinity of the outer diameter, and a thickness of 1 mm or more and less than 2 mm; This prevents dust that cannot be captured by the filter from adhering to the blades. The case portion is a first air passage forming portion that rectifies the flow of air along a circumferential direction of the impeller; a second air passage forming portion that rectifies the flow of air along a tangential direction of the impeller; a tongue portion formed between the first air passage forming portion and the second air passage forming portion; an air outlet provided on a lower surface of the case portion when the impeller is disposed so that a rotation axis of the impeller is oriented in a vertical direction, and through which air is blown out; The air passage height expansion section expands the height of the air passage from the area where the tongue portion is provided toward the area where the air outlet is provided. Blower device.

2. The inclination angle of the blade is between -5° and 30°. The blower device according to claim 1 .

3. The blade has a length of 10 mm or more and 20 mm or less. The blower device according to claim 1 or 2.

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