air blower

Abstract

To provide a blower which enables components to be standardized while inhibiting deterioration of air blowing performance.SOLUTION: In an air fan 100 serving as a blower, a fan 52 rotates around a set axis P set in a housing 3 to generate airflow. A guide member 8 has: an annular part 81 attached to a decorative grille 7; a top part 82 located closer to a suction bell mouth 531 than the annular part 81; and an inclined part 83 which extends from an entire periphery of the annular part 81 to the top part 82. A center position of the annular part 81 is offset from the set axis P. The top part 82 is located on the set axis P. A position of the guide member 8 relative to the decorative grille 7 may be changed in a circumferential direction of the annular part 81.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present disclosure relates to a blower device such as a ventilation fan. [Background technology]

[0002] Patent Document 1 discloses a ventilation device in which a sound-absorbing bellmouth is attached to the opening of a box-shaped main body incorporating a multi-blade fan, and a hollow, conical sound-absorbing guide member is attached to a panel facing the opening of the main body. The sound-absorbing bellmouth has an intake structure coaxial with the rotational shaft of the multi-blade fan motor. The sound-absorbing guide member is attached to the panel with the tip of its cone inserted into the intake structure of the sound-absorbing bellmouth. An air passage is formed between the sound-absorbing bellmouth and the sound-absorbing guide member, allowing air to flow smoothly from the outside of the main body to the inside of the main body. This reduces noise from the ventilation device. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Utility Model Registration No. 2504940 Summary of the Invention [Problem to be solved by the invention]

[0004] However, if the internal structures of the main bodies of multiple ventilation devices are different, the positions of the sound-absorbing bellmouth and multi-blade fan on the main body may differ for each ventilation device. Therefore, if a unit combining a sound-absorbing guide member and a panel is used as a common component for multiple ventilation devices, the sound-absorbing guide member may not be positioned appropriately relative to the sound-absorbing bellmouth and multi-blade fan on the main body in some ventilation devices. This raises concerns about reduced airflow performance, such as increased airway pressure loss and increased noise due to increased multi-blade fan rotation speed. Furthermore, if different panel and sound-absorbing guide member units were manufactured for each ventilation device to match the positions of the sound-absorbing bellmouth and multi-blade fan, the number of parts would increase.

[0005] The present disclosure is intended to solve the above-mentioned problems, and aims to provide a blower device that can standardize components while suppressing a decrease in blowing performance. [Means for solving the problem]

[0006] The air blower according to the present disclosure comprises an air blower main body and a grill unit attached to the air blower main body, the air blower main body having a housing in which an opening and an outlet are formed, and an air blowing section provided in the housing, the grill unit having a decorative grill covering the opening of the housing and a guide member attached to the decorative grill, the air blowing section having a fan and a fan casing, the fan generating an airflow by rotating around a set axis set in the housing, the fan casing having an intake bell mouth surrounding the set axis, inside the housing an internal air passage formed by the fan casing that guides the airflow that has flowed into the intake bell mouth to the outlet, the guide member having a circular ring portion attached to the decorative grill, an apex located closer to the suction bell mouth than the circular ring portion, and an inclined portion extending from the entire circumference of the circular ring portion to the apex, the center of the circular ring portion being positioned off the set axis and the apex being located on the set axis, and the position of the guide member relative to the decorative grill being changeable in the circumferential direction of the circular ring portion. [Effects of the Invention]

[0007] According to the present disclosure, it is possible to standardize parts while suppressing a decrease in air blowing performance. [Brief explanation of the drawings]

[0008] [Figure 1] 1 is a cross-sectional view showing a type A ventilation fan according to embodiment 1. FIG. [Figure 2] FIG. 2 is a side view showing the ventilation fan of FIG. [Figure 3] 3 is a front view showing the blower body of FIG. 2 as viewed from below. FIG. [Figure 4]FIG. 3 is a perspective view showing the grill unit of FIG. 2. [Figure 5] FIG. 5 is a perspective view showing the decorative grille of FIG. 4. [Figure 6] FIG. 5 is a perspective view showing the guide member of FIG. 4. [Figure 7] FIG. 2 is a partially cutaway perspective view showing the suction bell mouth and guide member of FIG. 1. [Figure 8] FIG. 2 is a side view showing a type B ventilation fan according to the first embodiment. [Figure 9] FIG. 9 is a perspective view showing the grill unit of FIG. 8. DETAILED DESCRIPTION OF THE INVENTION

[0009] The following describes embodiments of the subject matter of the present disclosure with reference to the accompanying drawings. In each drawing, identical or corresponding parts are designated by the same reference numerals, and redundant explanations are appropriately simplified or omitted. Note that the subject matter of the present disclosure is not limited to the following embodiments, and any component of the embodiments may be modified or omitted within the scope of the gist of the present disclosure.

[0010] Embodiment 1 The air blower in this embodiment is a duct ventilation fan. A duct ventilation fan draws air from inside a room and exhausts it to the outside through a ventilation duct. In this embodiment, two different ventilation fans, Type A and Type B, will be described. Type A and Type B ventilation fans are air blowers that send air from inside a room to the outside through a ventilation duct.

[0011] FIG. 1 is a cross-sectional view showing a Type A ventilation fan according to Embodiment 1. FIG. 2 is a side view showing the ventilation fan of FIG. 1. Type A ventilation fan 100 has a blower main body 1 and a grill unit 2. Blower main body 1 is attached to a ceiling board located at the top of a room, for example. Grill unit 2 is detachably attached to blower main body 1 in a state exposed to the room.

[0012] Fig. 3 is a front view showing the state when viewed from below of the air blower body 1 of Fig. 2. In Fig. 3, the grill unit 2 has been removed from the air blower body 1. As shown in Figs. 1 to 3, the air blower body 1 has a housing 3, a duct connection frame 4, an air blower section 5, and a power connection device 6.

[0013] The housing 3 is disposed so that the height direction of the housing 3 coincides with the vertical direction. The housing 3 has a housing main body 31 and a mounting flange 32.

[0014] The housing main body 31 has a top plate 311, a front plate 312, a rear plate 313, a first side plate 314, and a second side plate 315. The top plate 311 is square in shape. The front plate 312, the rear plate 313, the first side plate 314, and the second side plate 315 are arranged along the outer edge of the top plate 311.

[0015] The top panel 311 is disposed so as to intersect with the height direction of the housing 3. The front panel 312, the rear panel 313, the first side panel 314, and the second side panel 315 are each disposed along the height direction of the housing 3. When the housing main body 31 is viewed along the height direction of the housing 3, the internal space of the housing main body 31 is surrounded by the front panel 312, the rear panel 313, the first side panel 314, and the second side panel 315, as shown in FIG.

[0016] Here, a specific direction perpendicular to the height direction of the housing 3 is defined as the front-rear direction of the housing 3, and a direction perpendicular to both the height direction and the front-rear direction of the housing 3 is defined as the left-right direction of the housing 3. In this case, the front plate 312 and the rear plate 313 face each other in the front-rear direction of the housing 3. The first side plate 314 and the second side plate 315 face each other in the left-right direction of the housing 3.

[0017] The top plate 311 is located at one end of the housing body 31 in the height direction of the housing 3. The top plate 311 closes an opening formed by the front plate 312, the rear plate 313, the first side plate 314, and the second side plate 315.

[0018] The housing main body 31 is formed with a housing opening 33 and a discharge port 34. The housing opening 33 is formed at the other end of the housing main body 31 in the height direction of the housing 3. That is, of both end portions of the housing main body 31 in the height direction of the housing 3, the housing opening 33 is formed at the end opposite the end where the top plate 311 is located. The housing opening 33 is a square opening surrounded by a front plate 312, a rear plate 313, a first side plate 314, and a second side plate 315.

[0019] The outlet 34 is formed in the first side plate 314. As shown in FIGS. 2 and 3, a housing reference plane C0 indicating the center of the housing 3 in the front-to-rear direction of the housing 3 is set in the housing 3. The housing reference plane C0 is an imaginary plane that passes through the center of the housing 3 in the front-to-rear direction of the housing 3 and is perpendicular to the front-to-rear direction of the housing 3. In the type A ventilation fan 100, as shown in FIG. 3, the position of the outlet 34 in the housing body 31 is shifted toward the front plate 312 with respect to the housing reference plane C0. That is, in the type A ventilation fan 100, the outlet 34 is formed at a position closer to the front plate 312 than to the rear plate 313.

[0020] The mounting flange 32 is provided on the housing main body 31. The mounting flange 32 protrudes from the end of the housing main body 31 where the housing opening 33 is formed to the outside of the housing opening 33. Therefore, the mounting flange 32 protrudes from the respective edges of the front plate 312, the rear plate 313, the first side plate 314, and the second side plate 315 to the outside of the housing opening 33. The mounting flange 32 is perpendicular to the height direction of the housing 3.

[0021] The housing 3 is attached to the ceiling board with the housing main body 31 inserted into an opening formed in the ceiling board. The housing 3 is attached to the ceiling board with the housing opening 33 facing downward. As a result, the outlet 34 is located above the ceiling board, above the ceiling board, in the attic.

[0022] The mounting flange 32 is fastened to the ceiling board by a fastener (not shown) while overlapping the underside of the ceiling board, thereby attaching the housing 3 to the ceiling board.

[0023] 1, the housing body 31 is provided with a connection structure 35. The connection structure 35 is provided on the first side plate 314 in which the outlet 34 is formed. The connection structure 35 is a structure for attaching the duct connection frame 4 to the housing body 31.

[0024] The duct connection frame 4 is detachably attached to the housing body 31 via the connection structure 35. The duct connection frame 4 is attached to the housing body 31 while covering the outlet 34. Therefore, in the Type A ventilation fan 100, the position of the duct connection frame 4 relative to the housing body 31 is shifted toward the front panel 312 from the housing reference plane C0. That is, in the Type A ventilation fan 100, the duct connection frame 4 is positioned closer to the front panel 312 than to the rear panel 313. A ventilation duct (not shown) that reaches the outdoors is connected to the duct connection frame 4.

[0025] The duct connection frame 4 is attached to the housing body 31 by sliding relative to the connection structure 35 from the top plate 311 side to the mounting flange 32 side along the height direction of the housing 3. The duct connection frame 4 attached to the housing body 31 can be removed from the housing body 31 by sliding relative to the connection structure 35 from the mounting flange 32 side to the top plate 311 side along the height direction of the housing 3.

[0026] The blower 5 is provided in the housing main body 31. The blower 5 has a motor 51, a fan 52, and a fan casing 53.

[0027] The motor 51 is attached to the top plate 311 of the housing body 31. A portion of the motor 51 protrudes from the top plate 311 to the outside of the housing body 31. The motor 51 has a rotating shaft 51a. The rotating shaft 51a is located inside the housing body 31. When power is supplied to the motor 51, the motor 51 generates a driving force that rotates the rotating shaft 51a.

[0028] A set axis P is set in the housing body 31, which serves as a reference for the position of the blower unit 5 in the housing body 31. The set axis P is an imaginary straight line that passes through the housing opening 33. The set axis P is set along the height direction of the housing 3. The set axis P is set at a position that is off the housing reference plane C0 in the front-to-rear direction of the housing 3. In the type A ventilation fan 100, the set position of the set axis P with respect to the housing body 31 is shifted toward the rear panel 313 from the housing reference plane C0. In other words, in the type A ventilation fan 100, the set axis P is set at a position closer to the rear panel 313 than to the front panel 312.

[0029] The axis of the rotating shaft 51a of the motor 51 coincides with the set axis P. Therefore, in the type A ventilation fan 100, the position of the rotating shaft 51a relative to the housing main body 31 is shifted toward the rear panel 313 from the housing reference plane C0. That is, in the type A ventilation fan 100, the rotating shaft 51a is located at a position closer to the rear panel 313 than to the front panel 312. The rotating shaft 51a of the motor 51 is rotatable about the set axis P relative to the housing 3.

[0030] The fan 52 is disposed inside the housing main body 31. The fan 52 is fixed to a rotation shaft 51a of the motor 51. As a result, the fan 52 rotates integrally with the rotation shaft 51a around a set axis P relative to the housing 3.

[0031] In Type A ventilation fan 100, the position of fan 52 relative to housing body 31 is shifted toward rear panel 313 from housing reference plane C0. That is, in Type A ventilation fan 100, fan 52 is located closer to rear panel 313 than to front panel 312.

[0032] The fan 52 has a plurality of blades 521 arranged on a circumference centered on the set axis P. The cross-sectional shape of each blade 521 in a plane perpendicular to the set axis P is an airfoil shape with a rounded leading edge and a pointed trailing edge. Furthermore, the cross-sectional shape of each blade 521 in a plane perpendicular to the set axis P is the same at any position in the direction along the set axis P. The fan 52 rotates about the set axis P, thereby generating an airflow that flows from the inner peripheral side of the fan 52 to the outer peripheral side.

[0033] The fan casing 53 is provided inside the housing main body 31. The fan casing 53 has an inlet bell mouth 531. As shown in FIG. 1, the inlet bell mouth 531 is located between the fan 52 and the housing opening 33. The fan casing 53 is arranged with the inlet bell mouth 531 facing the housing opening 33.

[0034] The axis of suction bell mouth 531 coincides with set axis P. As a result, suction bell mouth 531 surrounds set axis P. The inner circumferential surface of suction bell mouth 531 is an inclined surface that continuously approaches set axis P from the housing opening 33 side toward fan 52. As a result, the inner diameter of suction bell mouth 531 continuously decreases toward fan 52. The shape of the inner circumferential surface of suction bell mouth 531 in a plane including set axis P is an arc that curves toward set axis P.

[0035] The airflow generated by the rotation of fan 52 flows from housing opening 33 into suction bell mouth 531. Inside housing main body 31, an internal air passage is formed by fan casing 53, which guides the airflow that has flowed into suction bell mouth 531 from housing opening 33 to discharge port 34. Fan 52 is arranged in the internal air passage formed by fan casing 53.

[0036] 3, the internal air passage is a spiral air passage surrounding the fan 52. The cross-sectional area of ​​the internal air passage increases continuously from the suction bell mouth 531 to the discharge port .

[0037] In Type A ventilation fan 100, when fan 52 is viewed from housing opening 33, fan 52 rotates clockwise about set axis P. The airflow that flows into suction bell mouth 531 flows from the inner peripheral side to the outer peripheral side of fan 52, and then flows along the internal air passage in the clockwise direction in Figure 3 on the outer peripheral side of fan 52, passing through discharge port 34. The airflow that has passed through discharge port 34 passes through duct connection frame 4 and the ventilation duct and is discharged to the outside of the room.

[0038] In Type A ventilation fan 100, the position of suction bell mouth 531 is shifted toward rear panel 313 relative to the position of discharge outlet 34. The cross-sectional area of ​​the internal air passage is larger at the position of discharge outlet 34 than at the position of suction bell mouth 531. Therefore, in Type A ventilation fan 100, in order to ensure the cross-sectional area of ​​the internal air passage adjacent to discharge outlet 34, set axis P is set at a position closer to rear panel 313 than housing reference plane C0.

[0039] The power connection device 6 is attached inside the housing body 31. The power connection device 6 is connected to the motor 51 via a cable. The power connection device 6 supplies power to the motor 51 by operating a switch (not shown).

[0040] The grill unit 2 has a decorative grill 7 and a guide member 8. The guide member 8 is attached to the decorative grill 7.

[0041] The decorative grill 7 is attached to the housing 3 by a pair of springs 71. This allows the decorative grill 7 to be detachably attached to the housing 3. The decorative grill 7 covers the housing opening 33 on the outside of the housing 3.

[0042] 3, a pair of spring mounting portions 72 are fixed to the inner surface of the housing main body 31. One of the pair of spring mounting portions 72 is fixed to the front plate 312, and the other is fixed to the rear plate 313. Each spring 71 is individually attached to the pair of spring mounting portions 72.

[0043] When the housing 3 and the decorative grill 7 are viewed along the set axis P, the center of the decorative grill 7 coincides with the center of the housing 3. Therefore, the center of the decorative grill 7 is located on the housing reference plane C0.

[0044] Fig. 4 is a perspective view showing the grill unit 2 of Fig. 2. Fig. 5 is a perspective view showing the decorative grill 7 of Fig. 4. The decorative grill 7 has a frame 73, a panel 74, a reinforcing member 75, and a plurality of connecting portions 76.

[0045] The frame 73 is a square frame that matches the shape of the mounting flange 32. The decorative grille 7 is attached to the housing 3 with the frame 73 overlapping the mounting flange 32. As a result, the frame 73 is arranged around the housing opening 33.

[0046] The multiple connecting portions 76 are provided at the four corners of the frame 73. The multiple connecting portions 76 are columnar members that connect the panel 74 to the frame 73. The panel 74 is fixed to the frame 73 via the multiple connecting portions 76. As a result, the panel 74 is disposed at a position away from the frame 73 in the direction along the set axis P.

[0047] The panel 74 has a square shape that matches the outer shape of the frame 73. The outer periphery of the panel 74 faces the frame 73 in the direction along the set axis P.

[0048] The panel 74 faces the housing opening 33. The center of the panel 74 coincides with the center of the decorative grille 7.

[0049] The reinforcing member 75 is a plate provided on the panel 74. The reinforcing member 75 is located closer to the frame 73 than the panel 74. The reinforcing member 75 is provided on the panel 74 along the front-rear direction of the housing 3. The reinforcing member 75 overlaps the center of the panel 74.

[0050] The reinforcing member 75 is provided with a pair of spring hooks 77. The pair of spring hooks 77 are arranged at positions spaced apart from each other in the front-to-rear direction of the housing 3. One of the spring hooks 77 is arranged at a position corresponding to the spring mounting portion 72 fixed to the front panel 312. The other spring hook 77 is arranged at a position corresponding to the spring mounting portion 72 fixed to the rear panel 313. The decorative grille 7 is attached to the housing 3 by the springs 71 attached to each spring mounting portion 72 being individually hung on each spring hook 77.

[0051] As shown in Fig. 5, the reinforcing member 75 is provided with a first screw hole 751 and a second screw hole 752. As shown in Fig. 4, the guide member 8 is fastened to the reinforcing member 75 with two screws 21 that are screwed into the first screw hole 751 and the second screw hole 752, respectively. The guide member 8 can be removed from the reinforcing member 75 by removing the screws 21. In this way, the guide member 8 is detachably attached to the panel 74 via the reinforcing member 75. As shown in Fig. 1, the guide member 8 is disposed at a position closer to the housing opening 33 than the panel 74.

[0052] 6 is a perspective view showing the guide member 8 of FIG. 4. The guide member 8 is a sound-absorbing member made of a porous material. The guide member 8 is attached to the decorative grille 7 with its height direction aligned with the set axis P. The guide member 8 has an annular portion 81, a top portion 82, and an inclined portion 83.

[0053] A groove 84 that fits over the reinforcing member 75 is formed in the annular portion 81. The annular portion 81 overlaps the reinforcing member 75 with the groove 84 fitting into the reinforcing member 75.

[0054] 6, the annular portion 81 is provided with a first through-hole 811 and a second through-hole 812. The screws 21 that fasten the guide member 8 to the reinforcing member 75 are passed through the first through-hole 811 and the second through-hole 812. The annular portion 81 is attached to the decorative grille 7 by the screws 21.

[0055] When the guide member 8 is viewed along the set axis P, the shape of the outer contour of the annular portion 81 is circular. Furthermore, when the grill unit 2 is viewed along the set axis P, the center of the annular portion 81 coincides with the center of the decorative grill 7. Therefore, as shown in FIG. 2, the center of the annular portion 81 is located on the housing reference plane C0. As a result, when the grill unit 2 is viewed along the set axis P, the center of the annular portion 81 is positioned off the set axis P.

[0056] 1, the apex 82 is located closer to the suction bell mouth 531 than the annular portion 81. When the guide member 8 is viewed along the set axis P, the apex 82 is located inside the outline of the annular portion 81.

[0057] The top 82 has a top end surface 821 that is perpendicular to the set axis P. The shape of the top end surface 821 is circular, as shown in Fig. 6. The position of the center of the top end surface 821 is identified as the position of the top 82.

[0058] 2, the center of the top end face 821 is located on the set axis P. That is, the top 82 is located on the set axis P. As a result, when the guide member 8 is viewed along the set axis P, the position of the top 82 is offset from the center of the annular portion 81. In the Type A ventilation fan 100, the position of the top 82 is offset toward the rear panel 313 from the housing reference plane C0 in the front-to-rear direction of the housing 3. As a result, the shape of the guide member 8 when viewed along the left-to-right direction of the housing 3 is a truncated cone that is asymmetrical with respect to the set axis P.

[0059] The inclined portion 83 is a curved portion that extends from the entire circumference of the annular portion 81 to the apex 82. The cross-sectional shape of the inclined portion 83 in a plane perpendicular to the set axis P is annular at any position in the direction along the set axis P. The cross-sectional area of ​​the outer shape of the inclined portion 83 in the plane perpendicular to the set axis P continuously decreases from the position of the annular portion 81 toward the position of the apex 82.

[0060] 1, an air layer 22 is formed between the guide member 8 and the panel 74. The air layer 22 is formed by closing the opening of the guide member 8, which is surrounded by the annular portion 81, with the panel 74.

[0061] When the suction bell mouth 531 and guide member 8 are viewed along the set axis P, the inner circumferential surface of the suction bell mouth 531 is located inside the outline of the annular portion 81. Furthermore, when the suction bell mouth 531 and guide member 8 are viewed along the set axis P, the apex 82 is located inside the inner circumferential surface of the suction bell mouth 531.

[0062] The height dimension of the guide member 8 in the direction along the set axis P is smaller than the height dimension of the decorative grille 7 in the direction along the set axis P. As a result, the guide member 8 is contained within the range between the frame 73 and the panel 74 in the direction along the set axis P.

[0063] The inclined portion 83 curves toward the inside of the annular portion 81 around the entire circumference of the guide member 8. As shown in Fig. 1, the intake airflow path 23 is formed between the intake bell mouth 531 and the guide member 8. The intake airflow path 23 guides the airflow generated by the rotation of the fan 52 from the outside of the housing 3 to the internal airflow path.

[0064] Fig. 7 is a partially cutaway perspective view showing suction bell mouth 531 and guide member 8 of Fig. 1. The cross-sectional area of ​​suction airflow passage 23 decreases from the position of annular portion 81 toward the position of top portion 82.

[0065] For example, two different positions in the direction along the set axis P are set as a first set position and a second set position for the inclined portion 83. The first set position is closer to the top 82 than the second set position. In this case, the air passage cross-sectional area S1 of the inlet air passage 23 when the inclined portion 83 is in the first set position is smaller than the air passage cross-sectional area S2 of the inlet air passage 23 when the inclined portion 83 is in the second set position.

[0066] The position of the guide member 8 relative to the decorative grill 7 can be changed in the circumferential direction of the annular portion 81 around the center of the annular portion 81. The position of the center of the annular portion 81 relative to the decorative grill 7 remains the same before and after the position of the guide member 8 relative to the decorative grill 7 is changed.

[0067] As described above, in the guide member 8, the top portion 82 is located on the set axis P, and the center of the annular portion 81 is offset from the set axis P. Therefore, the position of the top portion 82 with respect to the set axis P can be changed by changing the position of the guide member 8 in the circumferential direction of the annular portion 81. As a result, in the grill unit 2, the position of the top portion 82 with respect to the set axis P can be changed while maintaining the positional relationship between the center of the annular portion 81 and the set axis P.

[0068] The position of the guide member 8 relative to the decorative grill 7 can be changed by attaching or detaching the guide member 8 to or from the decorative grill 7. When changing the position of the guide member 8 relative to the decorative grill 7, the guide member 8 is removed from the decorative grill 7, and then the guide member 8 is rotated in the circumferential direction of the annular portion 81 to attach the guide member 8 to the decorative grill 7.

[0069] In the present embodiment, the position of the guide member 8 relative to the decorative grille 7 can be changed to either a first adjustment position or a second adjustment position, in which the rotation angles of the guide member 8 in the circumferential direction of the annular portion 81 differ by 180°. That is, the position of the guide member 8 relative to the decorative grille 7 can be changed to either a first adjustment position, in which the position of the top portion 82 is shifted toward the rear panel 313 from the housing reference plane C0, or a second adjustment position, in which the position of the top portion 82 is shifted toward the front panel 312 from the housing reference plane C0. In the Type A ventilation fan 100, the position of the guide member 8 relative to the decorative grille 7 is the first adjustment position.

[0070] When the position of the guide member 8 relative to the decorative grille 7 is at the first adjustment position, the screw 21 passed through the first through hole 811 is screwed into the first screw hole 751, and the screw 21 passed through the second through hole 812 is screwed into the second screw hole 752. When the position of the guide member 8 relative to the decorative grille 7 is at the second adjustment position, the screw 21 passed through the first through hole 811 is screwed into the second screw hole 752, and the screw 21 passed through the second through hole 812 is screwed into the first screw hole 751.

[0071] Next, a description will be given of Type B ventilation fan 200. Fig. 8 is a side view showing Type B ventilation fan 200 according to embodiment 1. Fig. 9 is a perspective view showing grill unit 2 of Fig. 8. The configuration of blower device main body 1 in Type B ventilation fan 200 is obtained by inverting the configuration of blower device main body 1 in Type A ventilation fan 100 with respect to the housing reference plane C0.

[0072] Therefore, in Type B ventilation fan 200, the position of outlet 34 in housing main body 31 is shifted toward rear panel 313 from housing reference plane C0. That is, in Type B ventilation fan 200, outlet 34 is formed in a position closer to rear panel 313 than to front panel 312. As a result, in Type B ventilation fan 200, the position of duct connection frame 4 relative to housing main body 31 is shifted toward rear panel 313 from housing reference plane C0. That is, in Type B ventilation fan 200, duct connection frame 4 is disposed in a position closer to rear panel 313 than to front panel 312.

[0073] Furthermore, in Type B ventilation fan 200, the set position of set axis P relative to housing body 31 is shifted toward front panel 312 from housing reference plane C0. That is, in Type B ventilation fan 200, set axis P is set at a position closer to front panel 312 than to rear panel 313. As a result, in Type B ventilation fan 200, the positions of motor 51, fan 52, and suction bell mouth 531 are each shifted toward front panel 312 from housing reference plane C0.

[0074] In Type B ventilation fan 200, guide member 8 is positioned in the second adjustment position relative to decorative grill 7. That is, in Type B ventilation fan 200, guide member 8 is attached to decorative grill 7 with top portion 82 shifted toward front panel 312 from housing reference plane C0. As a result, in Type B ventilation fan 200, top portion 82 is positioned on set axis P, just like in Type A ventilation fan 100. Other configurations of Type B ventilation fan 200 are the same as those of Type A ventilation fan 100.

[0075] Next, a description will be given of the procedure for attaching the grill unit 2 to the air blower body 1. The grill unit 2 is fabricated in advance by attaching the guide member 8 to the decorative grill 7.

[0076] In the type A ventilation fan 100, the guide member 8 is attached to the decorative grille 7 with the position of the guide member 8 relative to the decorative grille 7 set to the first adjustment position. At this time, the screw 21 passed through the first through hole 811 is screwed into the first screw hole 751, and the screw 21 passed through the second through hole 812 is screwed into the second screw hole 752.

[0077] In the type B ventilation fan 200, the guide member 8 is attached to the decorative grille 7 with the position of the guide member 8 relative to the decorative grille 7 set to the second adjustment position. At this time, the screw 21 passed through the first through hole 811 is screwed into the second screw hole 752, and the screw 21 passed through the second through hole 812 is screwed into the first screw hole 751.

[0078] Thereafter, with the decorative grille 7 facing the housing opening 33 and the top 82 positioned directly below the suction bell mouth 531, the grill unit 2 is attached to the housing 3 by the pair of springs 71. The grill unit 2 is held in place in the housing 3 by the elastic restoring force of each spring 71. This forms the suction air passage 23 between the inner circumferential surface of the suction bell mouth 531 and the guide member 8. In this manner, the grill unit 2 is attached to the air blower main body 1.

[0079] Next, we will explain the operation of Type A ventilation fan 100 and Type B ventilation fan 200. When power is supplied from power connection device 6 to motor 51, fan 52 rotates due to the driving force of motor 51. This generates an airflow that flows from indoors to outdoors.

[0080] The airflow generated by the rotation of fan 52 flows from the room through intake air duct 23 and into intake bell mouth 531. At this time, the cross-sectional area of ​​intake air duct 23 continuously decreases toward intake bell mouth 531, so the airflow flows into intake bell mouth 531 without being decelerated in intake air duct 23. This suppresses noise caused by the airflow flowing through intake air duct 23. At this time, noise is also suppressed by guide member 8 and air layer 22.

[0081] The airflow that has flowed into the intake bell mouth 531 passes through the internal air passage of the housing 3, the discharge port 34, the duct connection frame 4, and the ventilation duct before being discharged to the outside.

[0082] In these ventilation fans 100 and 200, the position of the guide member 8 relative to the decorative grille 7 can be changed in the circumferential direction of the annular portion 81. Therefore, in both ventilation fans 100 and 200, which have different positions of the set axis P relative to the housing 3, the top portion 82 can be positioned on the set axis P by changing the position of the guide member 8 relative to the decorative grille 7 in the circumferential direction of the annular portion 81. This allows the guide member 8 and the decorative grille 7 to be used as common parts for the ventilation fans 100 and 200. This allows the ventilation fans 100 and 200 to use common parts, thereby reducing the manufacturing costs of the parts.

[0083] Furthermore, in both Type A ventilation fan 100 and Type B ventilation fan 200, guide member 8 can be positioned appropriately with respect to set axis P. This allows for the formation of intake air passage 23 through which air flows easily, and prevents problems such as airflow pressure loss and noise caused by poor shape of intake air passage 23. Therefore, in both Type A ventilation fan 100 and Type B ventilation fan 200, components can be standardized while preventing a decrease in air blowing performance.

[0084] Furthermore, when guide member 8 is viewed along set axis P, top portion 82 is located inside the outline of annular portion 81. This makes it possible to reduce the deviation in the shape of intake air passage 23 around the entire circumference of guide member 8, thereby more reliably preventing a decrease in air blowing performance.

[0085] Furthermore, the cross-sectional area of ​​intake airflow passage 23 formed between intake bell mouth 531 and guide member 8 becomes smaller from the position of annular portion 81 toward the position of apex 82. This allows the airflow to flow through intake airflow passage 23 without slowing down, thereby improving the air blowing performance of intake airflow passage 23.

[0086] Furthermore, when the suction bell mouth 531 and guide member 8 are viewed along the set axis P, the inner circumferential surface of the suction bell mouth 531 is located inside the outline of the annular portion 81. This allows the guide member 8 to face the entire inner circumferential surface of the suction bell mouth 531, effectively forming the suction air passage 23. This improves the air blowing performance of the ventilation fans 100 and 200.

[0087] Furthermore, when the grill unit 2 is viewed along the set axis P, the center of the annular portion 81 coincides with the center of the decorative grill 7. Therefore, even if the position of the guide member 8 relative to the decorative grill 7 is changed in the circumferential direction of the annular portion 81, the attachment position of the annular portion 81 relative to the decorative grill 7 can be maintained in the same position. This allows the guide member 8 to be attached to the decorative grill 7 without having to worry about the position of the annular portion 81 relative to the decorative grill 7. Therefore, when attaching the guide member 8 to the decorative grill 7, it is only necessary to check the position of the top portion 82 relative to the decorative grill 7, which makes it easier to attach the guide member 8 to the decorative grill 7.

[0088] In addition, inclined portion 83 is curved toward the inside of annular portion 81. This makes it easier for the airflow flowing through intake airflow passage 23 to flow along inclined portion 83. This further ensures an improvement in the air blowing performance of ventilation fans 100 and 200.

[0089] Furthermore, the guide member 8 is made of a porous material, and an air layer 22 is formed between the panel 74 of the decorative grille 7 and the guide member 8. This allows noise to be absorbed by the porous material of the guide member 8. Also, the resonance of the air layer 22 causes friction between the air and the guide member 8, which converts sound energy into heat energy. This also has the effect of absorbing noise of a specific frequency. This allows noise generated by the ventilation fans 100 and 200 to be suppressed.

[0090] Furthermore, the guide member 8 is contained within the range between the panel 74 and the frame 73 in the direction along the set axis P. This prevents a portion of the guide member 8 from protruding from the space surrounded by the decorative grill 7. This allows the guide member 8 to be protected in each grill unit 2, even when multiple grill units 2 are stacked, and prevents damage to the guide member 8. This makes it easier to handle the grill unit 2.

[0091] In the above embodiment, the top portion 82 of the guide member 8 has a top end surface 821. However, the top portion 82 does not have to have a top end surface 821. That is, the top portion 82 may be formed as the apex of a cone by forming the top portion 82 into a pointed shape. In this case, the apex of the top portion 82 is located on the set axis P. Even in this manner, the top portion 82 can be located on the set axis P in both the ventilation fans 100 and 200, which have different positions of the set axis P relative to the housing 3. Therefore, the ventilation fans 100 and 200 can share parts while suppressing a decrease in air blowing performance.

[0092] Furthermore, in the above embodiment, the position of the guide member 8 relative to the decorative grill 7 can be changed to one of two adjustment positions in the circumferential direction of the annular portion 81. However, the position of the guide member 8 relative to the decorative grill 7 may be changed to one of three or more adjustment positions in the circumferential direction of the annular portion 81. In this way, the guide member 8 and the decorative grill 7 can be used as common parts for three or more types of ventilation fans having different internal structures of the air blower body 1.

[0093] Furthermore, in the above embodiment, the guide member 8 is made of a porous material. However, the material of the guide member 8 does not have to be a porous material. Even in this case, the guide member 8 and the decorative grill 7 can be used as common parts for each of the ventilation fans 100 and 200, and the top portion 82 of the guide member 8 can be positioned on the set axis P. In other words, even if the material of the guide member 8 is not a porous material, it is possible to standardize parts while suppressing a decrease in air blowing performance.

[0094] Furthermore, in the above embodiment, an air layer 22 is formed between the guide member 8 and the panel 74. However, the air layer 22 does not have to be formed. Even if the air layer 22 is not formed between the guide member 8 and the panel 74, it is possible to standardize parts while suppressing a decrease in air blowing performance.

[0095] Furthermore, in the above embodiment, the shape of the housing opening 33 is square. However, this is not limiting. For example, the shape of the housing opening 33 may be rectangular, or the shape of the housing opening 33 may be circular. In this case, the shapes of the frame 73 and the panel 74 are also made to match the shape of the housing opening 33. Even in this case, it is possible to standardize parts while suppressing a decrease in air blowing performance.

[0096] In the above embodiment, a duct fan is used as the air blower to which the grill unit 2 is applied. However, this is not limiting. For example, a ventilation fan other than a duct fan, an air conditioner, or the like may also be used as the air blower to which the grill unit 2 is applied.

[0097] The configurations described in the above embodiments are merely examples of the contents of the present disclosure. The embodiments can be combined with other known technologies. Part of the configuration of the embodiments can be omitted or modified without departing from the gist of the present disclosure.

[0098] Examples of aspects that may be included in the present disclosure are set forth below as appendices. (Appendix 1) A blower body; a grill unit attached to the air blower body; Equipped with the air blower body has a housing in which a housing opening and an outlet are formed, and an air blower provided in the housing, The grill unit has a decorative grill that covers the housing opening, and a guide member attached to the decorative grill, The blower unit has a fan and a fan casing, the fan generates an airflow by rotating around a set axis set on the housing; the fan casing has a suction bell mouth surrounding the set axis, an internal air passage formed by the fan casing inside the housing that guides the airflow that has flowed into the suction bell mouth to the discharge port; the guide member has a circular ring portion attached to the decorative grille, a top portion located closer to the suction bell mouth than the circular ring portion, and an inclined portion extending from the entire circumference of the circular ring portion to the top portion, The center of the annular portion is positioned off the set axis, The top is located on the set axis, The position of the guide member relative to the decorative grille is changeable in the circumferential direction of the annular portion. (Appendix 2) 2. The air blower according to claim 1, wherein, when the guide member is viewed along the set axis, the top portion is located inside an outline of the annular portion. (Appendix 3) The blower device according to claim 1 or 2, wherein the cross-sectional area of ​​the air intake passage formed between the suction bell mouth and the guide member decreases from the position of the annular portion toward the position of the top. (Appendix 4) 4. A blower device as described in any one of claims 1 to 3, wherein, when the suction bell mouth and the guide member are viewed along the set axis, the inner circumferential surface of the suction bell mouth is located inside the outline of the annular portion. (Appendix 5) 5. The air blower device according to claim 1, wherein, when the grill unit is viewed along the set axis, the center of the annular portion coincides with the center of the decorative grille. (Appendix 6) 6. The air blower according to any one of claims 1 to 5, wherein the inclined portion is curved toward the inside of the annular portion. (Appendix 7) the decorative grille has a panel facing the housing opening, the annular portion is attached to the panel, The guide member is made of a porous material, 7. The air blower according to claim 1, wherein an air layer is formed between the guide member and the panel. (Appendix 8) The decorative grille has a frame disposed around the housing opening and a connecting portion that connects the panel to the frame, 8. The blower device according to claim 7, wherein the guide member is located within a range between the panel and the frame in a direction along the set axis. [Explanation of symbols]

[0099] 1 blower body, 2 grill unit, 3 housing, 5 blower section, 7 decorative grill, 8 guide member, 22 air layer, 23 intake air duct, 33 housing opening, 34 exhaust port, 52 fan, 53 fan casing, 73 frame, 74 panel, 76 connecting section, 81 annular section, 82 top section, 83 inclined section, 531 intake bell mouth.

Claims

1. A blower body; a grill unit attached to the air blower body; Equipped with the air blower body has a housing in which a housing opening and an outlet are formed, and an air blower provided in the housing, The grill unit has a decorative grill that covers the housing opening, and a guide member attached to the decorative grill, The blower unit has a fan and a fan casing, the fan generates an airflow by rotating around a set axis set on the housing; the fan casing has a suction bell mouth surrounding the set axis, an internal air passage formed by the fan casing inside the housing that guides the airflow that has flowed into the suction bell mouth to the discharge port; the guide member has a circular ring portion attached to the decorative grille, a top portion located closer to the suction bell mouth than the circular ring portion, and an inclined portion extending from the entire circumference of the circular ring portion to the top portion, The center of the annular portion is positioned off the set axis, The top is located on the set axis, The position of the guide member relative to the decorative grille is changeable in the circumferential direction of the annular portion.

2. 2. The blower device according to claim 1, wherein when the guide member is viewed along the set axis, the top portion is located inside an outline of the annular portion.

3. 3. The blower device according to claim 1, wherein a cross-sectional area of ​​an intake air passage formed between the intake bell mouth and the guide member decreases from the position of the annular portion toward the position of the apex.

4. 3. The blower device according to claim 1, wherein when the suction bell mouth and the guide member are viewed along the set axis, the inner circumferential surface of the suction bell mouth is located inside the outline of the annular portion.

5. 3. The air blower device according to claim 1, wherein the center of the annular portion coincides with the center of the decorative grille when the grill unit is viewed along the set axis.

6. The blower device according to claim 1 or 2, wherein the inclined portion is curved toward the inside of the annular portion.

7. the decorative grille has a panel facing the housing opening, the annular portion is attached to the panel, The guide member is made of a porous material, The blower device according to claim 1 or 2, wherein an air layer is formed between the guide member and the panel.

8. The decorative grille has a frame disposed around the housing opening and a connecting portion that connects the panel to the frame, The blower device according to claim 7, wherein the guide member is contained within a range between the panel and the frame in the direction along the set axis.

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