Ventilation fan

Abstract

To provide a ventilation fan that can prevent a reversed flow of air into a sub-suction duct from a sub-suction port at the time of stopping a ventilation fan.SOLUTION: A ventilation fan 100 includes: a ventilation fan body 1 in which a main suction port 1e, a sub-suction port 1f, and an exhaust port 1g are formed; a fan 2 for generating an air flow that is oriented toward the exhaust port 1g from the main suction port 1e and the sub-suction port 1f; a cylindrical exhaust side duct connection part 3 detachably fitted to the ventilation fan body 1 to communicate between an exhaust side duct 10 and the exhaust port 1g; and a cylindrical sub-suction side duct connection part 5 detachably fitted to the ventilation fan body 1 to communicate between a sub-suction side duct 11 and the sub-suction port 1f. A sub-suction side shutter 6 capable of opening and closing is installed inside the sub-suction side duct connection part 5. The sub-suction side shutter 6 opens with intake pressure of an air flow generated by the fan 2 when the ventilation fan 100 operates to allow communication between the sub-suction side duct 11 and the sub-suction port 1f and closes with self-weight when the ventilation fan 100 stops to block communication between the sub-suction side duct 11 and the sub-suction port 1f.SELECTED DRAWING: Figure 2

Description

[Technical Field]

[0001] The present disclosure relates to a ventilation fan having a main inlet and a sub-inlet formed therein. [Background technology]

[0002] A conventional ventilation fan has a box-shaped ventilation fan body formed with an inlet and an exhaust port, and a cylindrical exhaust duct connector that connects the exhaust port to an exhaust duct leading to the outdoors and is detachably attached to the ventilation fan body. When the ventilation fan is operating, indoor air is drawn into the ventilation fan body through the inlet, and the drawn indoor air is exhausted to the outdoors through the exhaust port, the exhaust duct connector, and the exhaust duct.

[0003] An openable and closable exhaust-side shutter is generally installed inside the exhaust-side duct connection. For example, Patent Document 1 discloses an exhaust-side shutter that opens with exhaust pressure when the ventilation fan is operating, allowing communication between the exhaust port and the exhaust-side duct, and closes under its own weight when the ventilation fan is stopped, blocking communication between the exhaust port and the exhaust-side duct. By installing the exhaust-side shutter inside the exhaust-side duct connection, it is possible to prevent air from flowing back from the exhaust duct to the exhaust port when the ventilation fan is stopped, thereby preventing outside air from entering the room through the exhaust-side duct.

[0004] Some ventilation fans have two or more intake ports formed in the fan body, allowing them to ventilate two or more rooms. In this type of ventilation fan, for example, the fan body is formed with a main intake port for drawing in air from one room and a sub-intake port for drawing in air from another room, and a cylindrical sub-intake duct connector that connects the sub-intake port to a sub-intake duct connected to the other room is detachably attached to the fan body. [Prior art documents] [Patent documents]

[0005] [Patent Document 1] Patent No. 6735906 Summary of the Invention [Problem to be solved by the invention]

[0006] When air backflows from the sub-intake port to the sub-intake duct when the exhaust fan is stopped, the air drawn in during operation can enter another room through the sub-intake duct. While Patent Document 1 discloses an exhaust duct connector and an exhaust shutter for a ventilation fan capable of ventilating a single room, it does not disclose a ventilation fan capable of ventilating two or more rooms, nor does it disclose the provision of shutters inside the sub-intake duct connector and the sub-intake duct connector. Because the airflow direction and shape of the sub-intake duct connector and the exhaust duct connector are different, it is difficult to install a shutter with the same configuration as the exhaust shutter inside the sub-intake duct connector. Therefore, there is a need for a ventilation fan equipped with a shutter that can prevent air backflow from the sub-intake port to the sub-intake duct when the ventilation fan is stopped.

[0007] The present disclosure has been made in consideration of the above, and aims to provide a ventilation fan that can prevent air from flowing back from the sub-suction port to the sub-suction duct when the ventilation fan is stopped. [Means for solving the problem]

[0008] To solve the above-mentioned problems and achieve the object, the ventilation fan according to the present disclosure includes a box-shaped ventilation fan body, a fan, a cylindrical exhaust duct connector, and a cylindrical auxiliary intake duct connector. The ventilation fan body is formed with a main intake port for drawing in air from one room, an auxiliary intake port for drawing in air from a room other than the room into which the main intake port draws in air, and an exhaust port for discharging the drawn air. The fan is disposed inside the ventilation fan body and generates airflows from the main intake port and the auxiliary intake port toward the exhaust port. The exhaust duct connector is detachably attached to the ventilation fan body and connects the exhaust port to an exhaust duct connected to the outdoors. The auxiliary intake duct connector is detachably attached to the ventilation fan body and connects the auxiliary intake port to an auxiliary intake duct connected to another room. An openable and closable auxiliary intake shutter is installed inside the auxiliary intake duct connector. The sub-suction side shutter opens with the intake pressure of the airflow generated by the fan when the ventilation fan is operating, allowing communication between the sub-suction side duct and the sub-suction port, and closes under its own weight when the ventilation fan is stopped, blocking communication between the sub-suction side duct and the sub-suction port. [Effects of the Invention]

[0009] According to the present disclosure, it is possible to prevent backflow of air from the sub-intake port to the sub-intake duct when the ventilation fan is stopped. [Brief explanation of the drawings]

[0010] [Figure 1] FIG. 1 is a diagram illustrating a schematic view of a ventilation fan according to a first embodiment. [Figure 2] FIG. 1 is a vertical cross-sectional view showing an installation state of a ventilation fan according to a first embodiment. [Figure 3] FIG. 1 is a bottom view of the ventilation fan according to the first embodiment, showing a state in which the decorative grill is not attached and the terminal cover is closed. [Figure 4] FIG. 1 is a bottom view of the ventilation fan according to the first embodiment, showing a state in which the decorative grill is not attached and the terminal cover is open. [Figure 5] FIG. 10 is a front view showing the auxiliary suction duct connection portion according to the first embodiment as viewed from the auxiliary suction duct side. [Figure 6] FIG. 6 is a front view showing a state in which the sub-suction side shutter is omitted from the state shown in FIG. 5. [Figure 7] FIG. 10 is a perspective view showing a shutter stopper, a shutter bar, and a bearing portion of the sub-suction side duct connection portion in the first embodiment. [Figure 8] 9 is a vertical cross-sectional view showing a state in which the sub-suction side shutter is open during operation of the ventilation fan according to the first embodiment, and corresponds to the cross-sectional view taken along line IX-IX in FIG. [Figure 9] 9 is a vertical cross-sectional view showing a state in which the sub-suction side shutter is closed when the ventilation fan according to the first embodiment is stopped, taken along line IX-IX in FIG. DETAILED DESCRIPTION OF THE INVENTION

[0011] Hereinafter, a ventilation fan according to an embodiment will be described in detail with reference to the drawings.

[0012] Embodiment 1 FIG. 1 is a schematic diagram of a ventilation fan 100 according to a first embodiment. First, an overview of the ventilation fan 100 according to the first embodiment will be described with reference to FIG. 1. The ventilation fan 100 is installed above an opening 12a in a ceiling 12 of a main room. The ventilation fan 100 has a box-shaped ventilation fan body 1. One side of the ventilation fan body 1 is open as a main intake port 1e. An exhaust duct connector 3 is attached to one side surface 1c of the ventilation fan body 1, to which a duct (not shown) leading to the outdoors is connected. Another side surface 1d of the ventilation fan body 1 is attached to which a sub-intake duct connector 5 is connected to a duct (not shown) leading to an auxiliary room.

[0013] The ventilation fan 100 also includes a fan 2. The fan 2 is, for example, a centrifugal fan. The fan 2 has a fan casing 2a, a motor 2b, and blades 2c. When the blades 2c are rotated by driving the motor 2b, air is drawn in through an intake port 2d on the bottom surface of the spiral fan casing 2a and blown out in a centrifugal direction toward the exhaust duct connector 3.

[0014] Intake port 2d of fan casing 2a communicates with opening 12a in ceiling 12 of the main room and sub-intake duct connector 5. As a result, by rotating blades 2c, air from the main room and the sub-room drawn in through intake port 2d of fan casing 2a is exhausted to the outdoors through exhaust duct connector 3.

[0015] An openable and closable exhaust side shutter 4 is installed inside the exhaust side duct connection part 3. An openable and closable auxiliary intake side shutter 6 is installed inside the auxiliary intake side duct connection part 5.

[0016] Next, details of the ventilation fan 100 according to the first embodiment will be described. FIG. 2 is a vertical cross-sectional view showing the installation state of the ventilation fan 100 according to the first embodiment. FIG. 3 is a bottom view of the ventilation fan 100 according to the first embodiment, showing a state in which the decorative grille 7 is not attached and the terminal cover 8 is closed. FIG. 4 is a bottom view of the ventilation fan 100 according to the first embodiment, showing a state in which the decorative grille 7 is not attached and the terminal cover 8 is open. As shown in FIG. 2, the ventilation fan 100 includes a ventilation fan body 1, a fan 2, an exhaust duct connector 3, an exhaust shutter 4, a sub-intake duct connector 5, a sub-intake shutter 6, and a decorative grille 7.

[0017] An opening 12a is formed in the ceiling 12, connecting the room inside the room with the attic space 13. In FIG. 1, the upper side of the ceiling 12 on the page is the attic space 13, and the lower side of the ceiling 12 on the page is the room inside the room. The ventilation fan 100 is installed in the ceiling 12 using the opening 12a formed in the ceiling 12. The ventilation fan 100 is installed from the opening 12a to the attic space 13.

[0018] The ventilation fan body 1 is formed with a main inlet 1e for drawing in air from one room (the main room), a sub-inlet 1f for drawing in air from a room (an auxiliary room) separate from the room through which the main inlet 1e draws in air, and an exhaust outlet 1g for discharging the drawn-in air. The main inlet 1e is formed on the underside 1b of the ventilation fan body 1. The main inlet 1e draws in air from the room located directly below the ventilation fan 100. A main body flange 1h is formed on the underside 1b around the periphery of the main inlet 1e, extending horizontally away from the center of the main inlet 1e. A screw hole 1i (shown in FIG. 3) is formed in the main body flange 1h. The ventilation fan body 1 is fixed to the ceiling 12 by screwing a screw (not shown) into the screw hole 1i. The exhaust outlet 1g is formed on one side surface 1c of the ventilation fan body 1. The sub-inlet 1f is formed on a side surface 1d of the ventilation fan body 1 opposite to the side surface 1c on which the exhaust port 1g is formed.

[0019] The fan 2 is disposed inside the ventilation fan body 1 and generates airflows from the main air inlet 1e and the sub-air inlet 1f toward the exhaust outlet 1g. The fan 2 includes a fan casing 2a, a motor 2b, and blades 2c.

[0020] The fan casing 2a forms an air passage for the fan 2. An intake port 2d is formed on the underside of the fan casing 2a to draw in air that has flowed into the interior of the ventilation fan body 1 from the main intake port 1e. An outlet port 2e is formed on one side of the fan casing 2a to allow air inside the fan casing 2a to flow out toward the exhaust port 1g. The fan casing 2a is fixed to the top surface 1a of the ventilation fan body 1 with screws (not shown). A spring fixing portion 2f is attached to the underside of the fan casing 2a.

[0021] Motor 2b rotates blades 2c. Motor 2b is fixed to top surface 1a of ventilation fan body 1. Blades 2c are disposed inside fan casing 2a. Blades 2c are attached to shaft 2g of motor 2b.

[0022] The exhaust duct connector 3 is a tubular member detachably attached to the side surface 1c of the ventilation fan body 1 and connects the exhaust duct 10, which is connected to the outdoors, to the exhaust port 1g. The exhaust duct connector 3 extends from the side surface 1c of the ventilation fan body 1 in a direction perpendicular to the side surface 1c. The exhaust duct connector 3 serves to extend the position where air is discharged from the ventilation fan body 1 to a position where it connects to the exhaust duct 10. The exhaust duct connector 3 has a stepped outer shape with portions of different diameters. The stepped outer shape of the exhaust duct connector 3 allows multiple exhaust ducts 10 with different inner diameters to be selectively connected to the exhaust duct connector 3, and also makes it easier to wrap tape to secure the exhaust duct 10 to the exhaust duct connector 3. The exhaust duct 10 is connected to the outdoors. The exhaust duct 10 extends to the outdoors and is connected to a hood (not shown) attached to the exterior wall of the building, forming a ventilation air passage for ventilating the air inside the building.

[0023] An openable and closable exhaust-side shutter 4 is installed inside the exhaust-side duct connection part 3. The exhaust-side shutter 4 opens due to the exhaust pressure of the airflow generated by the fan 2 when the ventilation fan 100 is operating, allowing communication between the exhaust port 1g and the exhaust-side duct 10, and closes under its own weight when the ventilation fan 100 is stopped, blocking communication between the exhaust port 1g and the exhaust-side duct 10. By installing the exhaust-side shutter 4 inside the exhaust-side duct connection part 3, it is possible to prevent air from flowing back from the exhaust-side duct 10 to the exhaust port 1g when the ventilation fan 100 is stopped, and therefore it is possible to prevent outside air from entering the room through the exhaust-side duct 10.

[0024] The auxiliary suction side duct connector 5 is a cylindrical member that is detachably attached to the side surface 1d of the ventilation fan body 1 and connects the auxiliary suction side duct 11, which connects to another room, with the auxiliary suction port 1f. The auxiliary suction side duct connector 5 extends from the side surface 1d of the ventilation fan body 1 in a direction perpendicular to the side surface 1d. The auxiliary suction side duct connector 5 serves to extend the air intake position of the ventilation fan body 1 to a position that connects to the auxiliary suction side duct 11. The auxiliary suction side duct connector 5 has a stepped outer shape with portions of different diameters. The stepped outer shape of the auxiliary suction side duct connector 5 allows multiple auxiliary suction side ducts 11 with different inner diameters to be selectively connected to the auxiliary suction side duct connector 5, and also makes it easier to wrap tape to secure the auxiliary suction side duct 11 to the auxiliary suction side duct connector 5. The sub-intake duct 11 is installed when two or more rooms are ventilated with one ventilation fan 100. The sub-intake duct 11 is connected to a room separate from the room in which the ventilation fan 100 is installed. The sub-intake duct 11 is connected to a sub-intake decorative grill (not shown) installed in the separate room, forming a ventilation air path for ventilating the air inside the building.

[0025] An openable and closable sub-intake side shutter 6 is installed inside the sub-intake side duct connection part 5. The sub-intake side shutter 6 opens due to the intake pressure of the airflow generated by the fan 2 when the ventilation fan 100 is operating, allowing communication between the sub-intake side duct 11 and the sub-intake port 1f, and closes under its own weight when the ventilation fan 100 is stopped, blocking communication between the sub-intake side duct 11 and the sub-intake port 1f. Installing the sub-intake side shutter 6 inside the sub-intake side duct connection part 5 prevents air from flowing back from the sub-intake port 1f to the sub-intake side duct 11 when the ventilation fan 100 is stopped, thereby preventing air drawn in when the ventilation fan 100 is operating from entering another room through the sub-intake side duct 11.

[0026] The ventilation fan 100 draws in air from one room through the main intake port 1e of the ventilation fan body 1 and exhausts it outdoors through the exhaust port 1g, the exhaust duct connection part 3, and the exhaust duct 10. The ventilation fan 100 also draws in air from another room through the sub-intake duct 11, the sub-intake duct connection part 5, and the sub-intake port 1f of the ventilation fan body 1 and exhausts it outdoors through the exhaust port 1g, the exhaust duct connection part 3, and the exhaust duct 10.

[0027] As shown in FIG. 3, an openable / closable terminal cover 8 is attached to the underside of the fan casing 2a. The terminal cover 8 has a cylindrical rotating shaft 8a. The fan casing 2a is provided with a support portion 2h that rotatably supports the rotating shaft 8a. The support portion 2h has a rotation hole into which the rotating shaft 8a is inserted. The terminal cover 8 rotates around the rotating shaft 8a. The terminal cover 8 can be opened and closed. The underside of the terminal cover 8 is provided with a finger hook 8b on which an operator can hook their finger. This makes it easy to open and close the terminal cover 8.

[0028] As shown in FIG. 4 , a power connection device 9, which is connected to an external power source (not shown), is disposed in the space covered by the terminal cover 8. When the terminal cover 8 is closed, it covers the power connection device 9. The power connection device 9 is isolated from the air passage by the terminal cover 8 and the fan casing 2a. This prevents dust, moisture, and the like from entering the power connection device 9 from the air passage. The fan casing 2a is provided with a protective wall 2i that surrounds the periphery of the terminal cover 8. When the terminal cover 8 is closed, the terminal cover 8 and the protective wall 2i improve the airtightness of the storage section that houses the power connection device 9. On the other hand, when the terminal cover 8 is open, the power connection device 9 is accessible from inside the room, allowing an external power cable (not shown) that connects the external power source to the power connection device 9 to be easily connected to the power connection device 9 from inside the room.

[0029] The power supply connection device 9 shown in Fig. 4 and the motor 2b shown in Fig. 2 are electrically connected by motor wires (not shown). Power supplied from an external power supply (not shown) is transmitted to the motor 2b shown in Fig. 2 via the external power supply wires, the power supply connection device 9, and the motor wires. Electrical energy is converted into rotational motion of the shaft 2g of the motor 2b, and the rotational motion of the motor 2b is transmitted to the blades 2c, causing the blades 2c to rotate. The rotation of the blades 2c generates airflows from the main air inlet 1e and the sub-air inlet 1f toward the exhaust outlet 1g within the air passage formed by the fan casing 2a.

[0030] The decorative grill 7 is arranged on the underside of the ceiling 12 so as to cover the opening 12a from below. The decorative grill 7 covers the underside of the ventilation fan body 1. The decorative grill 7 is a design component that hides internal components such as the fan 2 so that they cannot be seen from inside the room. This prevents the appearance of the ventilation fan 100 from being marred when viewed from inside the room. The decorative grill 7 has a spring 7a. The spring 7a is attached to the decorative grill 7 by a spring fixing component 7b. The decorative grill 7 is fixed to the fan casing 2a by hooking the spring 7a onto a spring fixing portion 2f attached to the fan casing 2a.

[0031] Next, with reference to FIGS. 5 to 9, the details of the auxiliary suction side duct connector 5 and the auxiliary suction side shutter 6 will be described. FIG. 5 is a front view showing the auxiliary suction side duct connector 5 according to the first embodiment as viewed from the auxiliary suction side duct 11 side. FIG. 6 is a front view showing a state in which the auxiliary suction side shutter 6 is omitted from the state shown in FIG. 5. FIG. 7 is a perspective view showing the shutter stopper 5a, shutter bar 5b, and bearing portion 5c of the auxiliary suction side duct connector 5 according to the first embodiment. FIG. 8 is a vertical cross-sectional view showing a state in which the auxiliary suction side shutter 6 is open when the ventilation fan 100 according to the first embodiment is operating, and corresponds to the cross-sectional view taken along line IX-IX in FIG. 5. FIG. 9 is a vertical cross-sectional view showing a state in which the auxiliary suction side shutter 6 is closed when the ventilation fan 100 according to the first embodiment is stopped, and corresponds to the cross-sectional view taken along line IX-IX in FIG. 5. In FIGS. 8 and 9, cross-sectional hatching of the shutter bar 5b is omitted.

[0032] As shown in Figures 5 and 6, a cylindrical air passage 5e through which airflow passes is formed inside the sub-suction side duct connector 5. Hereinafter, the direction parallel to the central axis C of the cylindrical air passage 5e is referred to as the axial direction. The direction perpendicular to the axial direction, i.e., the up-down direction on the paper, is referred to as the vertical direction. The direction perpendicular to both the axial and vertical directions, i.e., the left-right direction on the paper, is referred to as the horizontal direction. Of the axial opening ends of the sub-suction side duct connector 5, the opening end connected to the sub-suction side duct 11 is referred to as the duct-side opening end 5f. The symbol D in Figures 5 and 9 schematically represents the center of gravity D of the sub-suction side shutter 6.

[0033] 5 and 6, the shape of the air passage 5e of the auxiliary suction side duct connector 5 is cylindrical in this embodiment, but may be modified as needed as long as it is cylindrical. A shutter stopper 5a, a shutter bar 5b, and a bearing 5c ​​are formed inside the auxiliary suction side duct connector 5. The auxiliary suction side shutter 6 has a rotating shaft 6a, a shutter body 6b, and a weight 6c.

[0034] As shown in Fig. 9, when the sub-suction side shutter 6 closes under its own weight while the ventilation fan 100 is stopped, the shutter stopper 5a comes into contact with the surface of the sub-suction side shutter 6 (shutter main body 6b) facing the sub-suction side duct 11, thereby restricting the rotation of the sub-suction side shutter 6. When the shutter main body 6b closes under its own weight while the ventilation fan 100 is stopped, the shutter stopper 5a comes into contact with part of the outer periphery of the shutter main body 6b. As shown in Fig. 6, the shape of the shutter stopper 5a is generally arch-shaped, surrounded by an arc and a chord.

[0035] In this embodiment, there are two shutter stoppers 5a. The two shutter stoppers 5a are arranged at positions facing each other in the horizontal direction, sandwiching the central axis C. Each shutter stopper 5a is formed integrally with the inner circumferential surface 5d of the sub-suction side duct connection portion 5. Each shutter stopper 5a is formed along a part of the inner circumferential surface 5d of the sub-suction side duct connection portion 5. Each shutter stopper 5a protrudes inward from both horizontal side portions of the inner circumferential surface 5d of the sub-suction side duct connection portion 5. Each shutter stopper 5a extends vertically from above to below the central axis C. The upper end of each shutter stopper 5a forms a flat surface extending horizontally.

[0036] As shown in FIG. 9, when the sub-suction side shutter 6 closes under its own weight while the ventilation fan 100 is stopped, the shutter bar 5b comes into contact with the surface of the sub-suction side shutter 6 (shutter body 6b) facing the sub-suction side duct 11, thereby preventing the sub-suction side shutter 6 from coming off. As shown in FIG. 6, the shutter bar 5b extends horizontally above the central axis C. The shutter bar 5b crosses the air passage 5e of the sub-suction side duct connector 5. The shutter bar 5b spans two shutter stops 5a. The shutter bar 5b is formed integrally with each shutter stopper 5a. Both ends of the shutter bar 5b in the horizontal direction (extension direction) are connected to the inner peripheral surface 5d of the sub-suction side duct connector 5 via the shutter stoppers 5a.

[0037] The shutter bar 5b has a plurality of first contact portions 5g and a plurality of second contact portions 5h. The first contact portions 5g and the second contact portions 5h are arranged alternately in the horizontal direction. When viewed along the axial direction, the shape of the first contact portions 5g is a rectangle that is longer in the horizontal direction than in the vertical direction. The vertical length of the first contact portions 5g is constant throughout the horizontal direction. When viewed along the axial direction, the shape of the second contact portions 5h is a circle. The second contact portions 5h protrude upward and downward more than the first contact portions 5g. The vertical length of the second contact portions 5h is longer than the vertical length of the first contact portions 5g.

[0038] As shown in FIG. 5, the bearing portion 5c rotatably supports the rotating shaft 6a. As shown in FIG. 6, the number of bearing portions 5c is two in this embodiment. The two bearing portions 5c are arranged horizontally opposite each other across the central axis C. Each bearing portion 5c is formed integrally with the inner circumferential surface 5d of the auxiliary suction side duct connecting portion 5. Each bearing portion 5c is formed on a part of the inner circumferential surface 5d of the auxiliary suction side duct connecting portion 5. Each bearing portion 5c protrudes inward from both horizontal side portions of the inner circumferential surface 5d of the auxiliary suction side duct connecting portion 5. One bearing portion 5c is continuous with the upper end portion of one shutter stopper 5a. The other bearing portion 5c is continuous with the upper end portion of the other shutter stopper 5a.

[0039] As shown in FIG. 7, each bearing 5c ​​is provided near the duct-side open end 5f of the sub-suction side duct connection portion 5. Note that while FIG. 7 shows only one bearing 5c, the other bearing 5c ​​has a similar configuration. The outer peripheral shape of each bearing 5c ​​is circular in this embodiment, but may be modified as appropriate. A shaft hole 5i into which the rotating shaft 6a is inserted is formed in each bearing 5c. The shape of each shaft hole 5i is circular in this embodiment, but may be modified as appropriate.

[0040] Each bearing portion 5c has a first peripheral wall 5j and a second peripheral wall 5k. The first peripheral wall 5j and the second peripheral wall 5k are walls surrounding the shaft hole 5i. The first peripheral wall 5j is a roughly semicircular wall constituting one half of the bearing portion 5c in the axial direction. The first peripheral wall 5j is provided at a position closer to the sub-suction duct 11 (see Figures 8 and 9) than the second peripheral wall 5k in the axial direction. The second peripheral wall 5k is a roughly semicircular wall constituting one half of the bearing portion 5c in the axial direction. The second peripheral wall 5k is provided at a position closer to the sub-suction port 1f (see Figure 2) than the first peripheral wall 5j. The protruding height of the first peripheral wall 5j is smaller than the protruding height of the second peripheral wall 5k. As a result, a step surface 5m facing the auxiliary suction duct 11 (upstream in the intake direction) is formed at the boundary between the first peripheral wall 5j and the second peripheral wall 5k. The step surface 5m extends in the vertical and horizontal directions.

[0041] A connecting rib 5n is provided between the uppermost portion of the outer peripheral surface of the second peripheral wall 5k and the inner peripheral surface 5d of the auxiliary suction side duct connecting portion 5. The connecting rib 5n is provided at the boundary portion of the outer peripheral surface of the second peripheral wall 5k with the first peripheral wall 5j and is continuous with the step surface 5m. When viewed in the axial direction, the connecting rib 5n has a triangular shape. The connecting rib 5n connects the bearing portion 5c and the inner peripheral surface 5d of the auxiliary suction side duct connecting portion 5, and serves to reinforce the bearing portion 5c.

[0042] As shown in FIG. 5, the rotating shafts 6a are rotatably supported by the bearing portions 5c. In this embodiment, there are two rotating shafts 6a. The two rotating shafts 6a are arranged horizontally opposite each other with the central axis C in between. One rotating shaft 6a is inserted into the shaft hole 5i of each bearing portion 5c. Each rotating shaft 6a protrudes horizontally from the outer peripheral surface of the shutter main body 6b. In this embodiment, the rotating shafts 6a are formed integrally with the shutter main body 6b, but they may be formed separately from the shutter main body 6b. By inserting the rotating shafts 6a into the shaft holes 5i, the sub-suction side shutter 6 is rotatably supported by the sub-suction side duct connecting portion 5.

[0043] The shutter body 6b can rotate around a horizontal axis as the rotation shaft 6a rotates. The shutter body 6b is a thin, plate-like member made of resin. The shutter body 6b is formed in a shape and size that allows it to block the air passage 5e of the auxiliary suction side duct connection portion 5. In this embodiment, the shape of the upper edge 6d of the shutter body 6b when viewed along the axial direction is an arc shape, but this may be changed as appropriate to match the shape of the air passage 5e of the auxiliary suction side duct connection portion 5. The shutter body 6b rotates between an open position shown in FIG. 8 that allows communication between the auxiliary suction side duct 11 and the auxiliary suction port 1f and a closed position shown in FIG. 9 that blocks communication between the auxiliary suction side duct 11 and the auxiliary suction port 1f.

[0044] As shown in FIG. 5, the weight 6c is provided on the shutter body 6b. In this embodiment, the weight 6c is formed integrally with the shutter body 6b, but it may be formed separately from the shutter body 6b. That is, in this embodiment, the weight 6c is formed integrally with the shutter body 6b by locally thickening a portion of the shutter body 6b, but the weight 6c may be formed by attaching a separate member to the shutter body 6b. The weight 6c is preferably provided on the surface of the shutter body 6b facing the auxiliary suction side duct 11 in the closed position, but may also be provided on the surface of the shutter body 6b facing the auxiliary suction port 1f in the closed position. The rotation shaft 6a and the weight 6c are provided above the center of gravity D of the auxiliary suction side shutter 6. The weight 6c is provided above the rotation shaft 6a. The weight 6c is preferably provided at the horizontal center of the shutter body 6b, but it may be provided offset from the horizontal center of the shutter body 6b. The shape of the weight 6c when viewed along the axial direction is horizontally symmetrical.

[0045] The outer periphery of the weight 6c has an upper portion 6e, a lower portion 6f, and two side portions 6g and 6h. The lower portion 6f is disposed below and spaced apart from the upper portion 6e. The side portion 6g connects one end of the upper portion 6e to one end of the lower portion 6f in the horizontal direction. The side portion 6h connects the other end of the upper portion 6e to the other end of the lower portion 6f in the horizontal direction. When viewed along the axial direction, the shape of the upper portion 6e is an arc along the upper edge 6d of the shutter main body 6b. When viewed along the axial direction, the shapes of the portions other than the upper portion 6e (the lower portion 6f and the side portions 6g and 6h) are linear. The axial thickness of the weight 6c is preferably equal to or greater than the axial thickness of the shutter main body 6b, but may be less than the axial thickness of the shutter main body 6b.

[0046] As shown in FIG. 8, when the ventilation fan 100 is operating, the shutter body 6b separates from the shutter stopper 5a due to the intake pressure of the airflow from the auxiliary suction duct 11 toward the auxiliary suction port 1f and rotates until it hits the inner circumferential surface 5d of the auxiliary suction duct connector 5, opening the air passage 5e of the auxiliary suction duct connector 5. Specifically, the portion of the shutter body 6b below the rotation axis 6a is pushed open toward the auxiliary suction port 1f by the intake pressure and hits the inner circumferential surface 5d of the auxiliary suction duct connector 5. This restricts the rotation of the shutter body 6b, maintaining the opening angle of the shutter body 6b. Furthermore, the portion of the shutter body 6b above the rotation axis 6a tilts toward the auxiliary suction duct 11. The airflow passes above and below the shutter body 6b and flows toward the auxiliary suction port 1f. On the other hand, as shown in FIG. 9, when the ventilation fan 100 is stopped, the shutter body 6b rotates under its own weight until it contacts the shutter stopper 5a, thereby blocking the air passage 5e of the sub-suction side duct connector 5.

[0047] Next, the effects of the ventilation fan 100 according to this embodiment will be described.

[0048] In this embodiment, as shown in FIGS. 8 and 9, an openable and closable sub-intake shutter 6 is installed inside the sub-intake duct connector 5. The sub-intake shutter 6 opens due to the intake pressure of the airflow generated by the fan 2 when the exhaust fan 100 is operating, allowing communication between the sub-intake duct 11 and the sub-intake port 1f. When the exhaust fan 100 is stopped, the shutter 6 closes under its own weight, blocking communication between the sub-intake duct 11 and the sub-intake port 1f. This configuration prevents air from flowing back from the sub-intake duct 11 to the sub-intake port 1f when the exhaust fan 100 is stopped, thereby preventing air drawn into another room through the sub-intake duct 11 when the exhaust fan 100 is operating. Furthermore, the movement of air, particularly odors, between rooms (between the main room and the auxiliary room) can be suppressed when the exhaust fan 100 is stopped.

[0049] In this embodiment, as shown in Fig. 9, the inner surface 5d of the auxiliary suction side duct connection portion 5 is formed with a shutter stopper 5a that restricts rotation of the auxiliary suction side shutter 6 by contacting the surface of the auxiliary suction side shutter 6 facing the auxiliary suction side duct 11 when the auxiliary suction side shutter 6 closes under its own weight while the exhaust fan 100 is stopped. This configuration restricts rotation of the auxiliary suction side shutter 6 in the closed position, maintaining a state in which communication between the auxiliary suction side duct 11 and the auxiliary suction port 1f is blocked when the exhaust fan 100 is stopped. Also, in this embodiment, as shown in Fig. 8, the auxiliary suction side shutter 6 moves away from the shutter stopper 5a when it opens due to the intake pressure of the airflow while the exhaust fan 100 is operating. With this configuration, when the ventilation fan 100 is operating, the rotation of the sub-suction side shutter 6 is not restricted by the shutter stopper 5a, and the sub-suction side shutter 6 opens, allowing communication between the sub-suction side duct 11 and the sub-suction port 1f.

[0050] 7, in this embodiment, each bearing 5c ​​is provided near the duct side opening end 5f of the auxiliary suction side duct connection portion 5. This configuration makes it easier to see each bearing 5c ​​from the duct side opening end 5f of the auxiliary suction side duct connection portion 5, improving the ease of inserting the rotating shaft 6a from the duct side opening end 5f of the auxiliary suction side duct connection portion 5 into the shaft hole 5i of each bearing 5c.

[0051] In this embodiment, as shown in FIG. 7, each bearing 5c ​​has a first peripheral wall 5j provided on the auxiliary suction duct 11 side and a second peripheral wall 5k provided on the auxiliary suction port 1f side. The first peripheral wall 5j and the second peripheral wall 5k are walls surrounding a shaft hole 5i into which the rotating shaft 6a is inserted. The protruding height of the first peripheral wall 5j is smaller than the protruding height of the second peripheral wall 5k. With this configuration, when the rotating shaft 6a (see FIG. 8) is inserted from the duct-side opening end 5f of the auxiliary suction duct connecting portion 5 into the shaft hole 5i of each bearing 5c, the rotating shaft 6a easily climbs over the first peripheral wall 5j. Therefore, the rotating shaft 6a can be inserted into the shaft hole 5i of each bearing 5c ​​without excessively bending the rotating shaft 6a and the shutter body 6b (see FIG. 8). Furthermore, even when a large intake pressure is applied to the auxiliary suction side shutter 6 (see FIG. 8), the rotating shaft 6a is unlikely to overcome the second peripheral wall 5k, preventing the auxiliary suction side shutter 6 from coming off the auxiliary suction side duct connector 5. In this embodiment, the shutter body 6b is made of a thin, resinous plate-like member, which allows the shutter body 6b to be easily bent, making it easier to insert the rotating shaft 6a into the shaft hole 5i of each bearing 5c. Therefore, when the shutter body 6b is made of a thin, resinous plate-like member, the protruding height of the first peripheral wall 5j and the protruding height of the second peripheral wall 5k may be the same. On the other hand, when the protruding height of the first peripheral wall 5j is smaller than the protruding height of the second peripheral wall 5k, as in this embodiment, the shutter body 6b does not have to be made of a thin, resinous plate-like member, because it makes it easier to insert the rotating shaft 6a into the shaft hole 5i of each bearing 5c.

[0052] If the protruding height of the first peripheral wall 5j is made lower than the protruding height of the second peripheral wall 5k as described above to make it easier to insert the rotating shaft 6a into the shaft hole 5i of each bearing portion 5c, the sub-suction side shutter 6 may come off from the sub-suction side duct connecting portion 5 when wind pressure in the direction opposite to the intake pressure acts on the sub-suction side shutter 6. In this regard, in this embodiment, as shown in FIG. 9 , a shutter bar 5b is formed inside the sub-suction side duct connecting portion 5. The shutter bar 5b prevents the sub-suction side shutter 6 from coming off by contacting the surface of the sub-suction side shutter 6 facing the sub-suction side duct 11 when the sub-suction side shutter 6 closes under its own weight while the exhaust fan 100 is stopped. This configuration prevents the sub-suction side shutter 6 from coming off from the sub-suction side duct connecting portion 5 even when wind pressure in the direction opposite to the intake pressure acts on the sub-suction side shutter 6. Furthermore, even when wind pressure in the opposite direction to the intake air pressure acts on the sub-intake side shutter 6, the shutter bar 5b can suppress deformation of the sub-intake side shutter 6, thereby preventing the sub-intake side shutter 6 from coming off the sub-intake side duct connecting part 5. Furthermore, as shown in Figure 6, the shutter bar 5b crosses the air passage 5e of the sub-intake side duct connecting part 5 and is connected to the inner surface 5d of the sub-intake side duct connecting part 5 via the shutter stopper 5a, thereby suppressing deformation of the sub-intake side duct connecting part 5 and further preventing the sub-intake side shutter 6 from coming off the sub-intake side duct connecting part 5.

[0053] 8 and 9, the auxiliary suction side shutter 6 in this embodiment includes a rotating shaft 6a rotatably supported by bearing 5c, a shutter body 6b that rotates with the rotation of the rotating shaft 6a between an open position that allows communication between the auxiliary suction side duct 11 and the auxiliary suction port 1f and a closed position that blocks communication between the auxiliary suction side duct 11 and the auxiliary suction port 1f, and a weight 6c attached to the shutter body 6b. The rotating shaft 6a and weight 6c are located above the center of gravity D of the auxiliary suction side shutter 6. With this configuration, when the exhaust fan 100 is operating, the weight 6c assists the rotation of the shutter body 6b to the open position, making it easier to open the shutter body 6b with minimal intake pressure. In particular, in this embodiment, the weight 6c is provided above the rotation axis 6a, so that the weight 6c further assists the rotation of the shutter body 6b to the open position, making it easier to open the shutter body 6b with minimal intake pressure.

[0054] In this embodiment, as shown in Fig. 5, the upper edge 6d of the shutter body 6b has an arcuate shape. The weight 6c is provided above the rotation shaft 6a. The upper part 6e of the outer periphery of the weight 6c has an arcuate shape that follows the upper edge 6d of the shutter body 6b, and the outer periphery of the weight 6c other than the upper part 6e has a linear shape. With this configuration, the weight 6c can be arranged along the upper edge 6d of the shutter body 6b and can be brought close to the top of the shutter body 6b, making it easier to open the shutter body 6b with a minimum intake air pressure.

[0055] In this embodiment, the weight 6c is formed integrally with the shutter main body 6b, as shown in Figure 5. This configuration eliminates the need to attach the weight 6c to the shutter main body 6b, and also reduces the material costs and processing costs of the weight 6c.

[0056] Next, a modification of this embodiment will be described.

[0057] The shape and position of the shutter stopper 5a shown in Fig. 5 are not limited to the illustrated example and may be changed as appropriate. For example, the shutter stopper 5a may be formed around the entire inner circumferential surface 5d of the auxiliary suction side duct connecting portion 5. In other words, an annular shutter stopper 5a may be formed on the inner circumferential surface 5d of the auxiliary suction side duct connecting portion 5. In this configuration, each bearing portion 5c and connecting rib 5n is connected to the inner circumferential surface 5d of the auxiliary suction side duct connecting portion 5 via the shutter stopper 5a.

[0058] The shape and position of the shutter bar 5b shown in Fig. 5 are not limited to the illustrated example and may be changed as appropriate. For example, the overall shape of the shutter bar 5b may be a rectangle whose vertical length is constant across the horizontal direction. In addition, although the shutter bar 5b is provided at the auxiliary suction side duct connection portion 5 in the above embodiment, the shutter bar 5b may be omitted.

[0059] The shape of the upper portion 6e when viewed along the axial direction shown in Figure 5 is not limited to the example shown in the figure and may be changed as appropriate. For example, the shape of the upper portion 6e when viewed along the axial direction may be linear. In addition, in the above embodiment, the weight 6c is provided on the auxiliary suction side shutter 6, but the weight 6c may be omitted.

[0060] In the above embodiment, a bearing portion 5c is provided at the auxiliary suction side duct connection portion 5 and a rotating shaft 6a is provided at the auxiliary suction side shutter 6, but it is also possible to provide a rotating shaft at the auxiliary suction side duct connection portion 5 and a bearing portion at the auxiliary suction side shutter 6.

[0061] In the above embodiment, the fan 2 is a centrifugal fan, but it may also be an axial fan.

[0062] The configurations shown in the above embodiments are merely examples, and may be combined with other known technologies, and parts of the configurations may be omitted or modified without departing from the spirit of the invention.

[0063] Various aspects of the present disclosure are summarized below as appendices.

[0064] (Appendix 1) a box-shaped ventilation fan body formed with a main suction port for drawing in air from one room, a sub-suction port for drawing in air from a room other than the room into which the main suction port draws in air, and an exhaust port for exhausting the drawn-in air; a fan disposed inside the ventilation fan body and configured to generate airflows from the main air inlet and the sub air inlet toward the exhaust outlet; a cylindrical exhaust duct connector that is detachably attached to the ventilation fan body and that connects the exhaust port to an exhaust duct that is connected to the outdoors; a cylindrical auxiliary suction side duct connection part that is detachably attached to the ventilation fan body and that connects the auxiliary suction side duct connected to the separate room with the auxiliary suction port; Equipped with an openable and closable sub-suction side shutter is installed inside the sub-suction side duct connection part, The auxiliary intake side shutter opens due to the intake pressure of the airflow generated by the fan when the fan is operating, allowing communication between the auxiliary intake side duct and the auxiliary intake port, and closes under its own weight when the fan is stopped, blocking communication between the auxiliary intake side duct and the auxiliary intake port. (Appendix 2) a shutter stopper is formed on an inner peripheral surface of the auxiliary suction side duct connection portion to restrict rotation of the auxiliary suction side shutter by contacting a surface of the auxiliary suction side shutter facing the auxiliary suction side duct when the auxiliary suction side shutter closes under its own weight while the ventilation fan is stopped; The ventilation fan described in Appendix 1, characterized in that the auxiliary suction side shutter moves away from the shutter stopper when it opens at the intake pressure during operation of the ventilation fan. (Appendix 3) The ventilation fan described in Appendix 1 or 2 is characterized in that a shutter bar is formed inside the auxiliary suction side duct connection portion to prevent the auxiliary suction side shutter from coming off by contacting the surface of the auxiliary suction side shutter facing the auxiliary suction side duct when the auxiliary suction side shutter closes under its own weight when the ventilation fan is stopped. (Appendix 4) Two bearing portions are formed on the inner circumferential surface of the sub-suction side duct connection portion, The auxiliary suction side shutter is a rotating shaft rotatably supported by the bearing portion; a shutter body that is rotatable in accordance with the rotation of the rotary shaft and that rotates between an open position that allows communication between the auxiliary suction side duct and the auxiliary suction port and a closed position that blocks communication between the auxiliary suction side duct and the auxiliary suction port; a weight provided on the shutter body; and The ventilation fan described in any one of appendixes 1 to 3, wherein the rotation shaft and the weight are provided above the center of gravity of the auxiliary suction side shutter. (Appendix 5) The upper edge of the shutter body has an arcuate shape, the weight is provided above the rotation shaft, The shape of the upper part of the outer periphery of the weight is an arc shape that follows the upper edge of the shutter body, The ventilation fan according to claim 4, wherein the outer periphery of the weight, except for the upper portion, is linear. [Explanation of symbols]

[0065] 1 Ventilation fan body, 1a top surface, 1b bottom surface, 1c, 1d side surface, 1e main intake port, 1f sub-intake port, 1g exhaust port, 1h main body flange portion, 1i screw hole, 2 fan, 2a fan casing, 2b motor, 2c blade, 2d intake port, 2e outlet port, 2f spring fixing portion, 2g shaft, 2h support portion, 2i protective wall, 3 exhaust side duct connection portion, 4 exhaust side shutter, 5 sub-intake side duct connection portion, 5a shutter stopper, 5b shutter bar, 5c bearing portion, 5d inner peripheral surface, 5e air passage, 5f duct side opening end, 5g first contact portion, 5h second contact portion, 5i shaft hole, 5j first peripheral wall, 5k second peripheral wall, 5m step surface, 5n connecting rib, 6 Sub-suction side shutter, 6a, 8a rotating shaft, 6b shutter body, 6c weight, 6d upper edge, 6e upper part, 6f lower part, 6g, 6h side part, 7 decorative grill, 7a spring, 7b spring fixing part, 8 terminal cover, 8b finger hook part, 9 power connection device, 10 exhaust side duct, 11 sub-suction side duct, 12 ceiling, 12a opening, 13 attic, 100 ventilation fan.

Claims

1. a box-shaped ventilation fan body formed with a main suction port for drawing in air from one room, a sub-suction port for drawing in air from a room other than the room into which the main suction port draws in air, and an exhaust port for exhausting the drawn-in air; a fan disposed inside the ventilation fan body and configured to generate airflows from the main air inlet and the sub air inlet toward the exhaust outlet; a cylindrical exhaust duct connector that is detachably attached to the ventilation fan body and that connects the exhaust port to an exhaust duct that is connected to the outdoors; a cylindrical auxiliary suction side duct connection part that is detachably attached to the ventilation fan body and that connects the auxiliary suction side duct connected to the separate room with the auxiliary suction port; Equipped with an openable and closable sub-suction side shutter is installed inside the sub-suction side duct connection part, The auxiliary intake side shutter opens due to the intake pressure of the airflow generated by the fan when the fan is operating, allowing communication between the auxiliary intake side duct and the auxiliary intake port, and closes under its own weight when the fan is stopped, blocking communication between the auxiliary intake side duct and the auxiliary intake port.

2. a shutter stopper is formed on an inner peripheral surface of the auxiliary suction side duct connection portion to restrict rotation of the auxiliary suction side shutter by contacting a surface of the auxiliary suction side shutter facing the auxiliary suction side duct when the auxiliary suction side shutter closes under its own weight while the ventilation fan is stopped; The ventilation fan according to claim 1 , wherein the sub-suction side shutter separates from the shutter stopper when the sub-suction side shutter opens at the intake pressure during operation of the ventilation fan.

3. The ventilation fan described in claim 1, characterized in that a shutter bar is formed inside the auxiliary suction side duct connection portion to prevent the auxiliary suction side shutter from coming off by contacting the surface of the auxiliary suction side shutter facing the auxiliary suction side duct when the auxiliary suction side shutter closes under its own weight when the ventilation fan is stopped.

4. Two bearing portions are formed on an inner peripheral surface of the sub-suction side duct connection portion, The auxiliary suction side shutter is a rotating shaft rotatably supported by the bearing portion; a shutter body that is rotatable in accordance with the rotation of the rotary shaft and that rotates between an open position that allows communication between the auxiliary suction side duct and the auxiliary suction port and a closed position that blocks communication between the auxiliary suction side duct and the auxiliary suction port; a weight provided on the shutter body; and 4. The ventilation fan according to claim 1, wherein the rotation shaft and the weight are provided above the center of gravity of the sub-suction side shutter.

5. The upper edge of the shutter body has an arcuate shape, the weight is provided above the rotation shaft, The shape of the upper part of the outer periphery of the weight is an arc shape that follows the upper edge of the shutter body, The ventilation fan according to claim 4 , wherein the outer periphery of the weight, except for the upper portion, has a linear shape.

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