JP2009180445A - Ceiling flush type ventilation fan - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a ceiling flush type ventilation fan with improved operability, having the superior disassembling performance and assembling performance of components when carrying out the cleaning of centrifugal blow blades in a narrow space of a frame attached to a high place. <P>SOLUTION: A scroll-like casing 4 is provided in a box-like frame 3, the centrifugal blow blades 5 are arranged in the casing 4, the casing 4 has an opening 7 with a diameter larger than outer diameters of the centrifugal blow blades 5 in a lower face of the casing, an orifice 9 is provided, forming a suction port 8 in the opening 7, and the orifice 9 is detachably formed in a space below the casing 4 in the frame 3 from an opening of the frame 3 lower face without using any tools. By this, since the centrifugal blow blades 5 can be taken out of the opening 7 formed by removing the orifice 9, cleaning can be carried out by removing the centrifugal blow blades 5, thus improving cleaning performance. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a ceiling-embedded ventilation fan that is connected to a duct that communicates with the outside installed in the back of the ceiling and is embedded in an opening provided in the ceiling.

  Conventionally, what is shown by FIG. 10 as an example of this kind of ceiling-embedded ventilation fan is known (for example, refer patent document 1).

  The configuration will be described below with reference to FIG.

As shown in FIG. 10, a box-shaped frame 104 having a suction port 102 covered with a grill 101 on the lower surface and provided with a discharge port 103 on a side surface, an adapter 106 for connecting a duct 105 communicating with the outdoors, a frame 104 includes a scroll-shaped casing 108 having an orifice 107 as a suction port on the lower surface, a centrifugal blower blade 109 disposed in the casing 108 for blowing air, and an electric motor 110 for rotationally driving the centrifugal blower blade 109. It was prepared.
JP 2003-65581 A

  In such a conventional ceiling-mounted type ventilation fan, even if indoor dust adheres to the centrifugal air blowing blade 109 due to long-term use and the required ventilation performance cannot be exhibited, an attempt is made to clean the centrifugal air blowing blade 109. There was a problem that the orifice 107 hinders cleaning.

  Further, as a ventilation fan that removes an orifice and attaches and detaches blades, for example, a pipe ventilation fan described in Japanese Patent Application Laid-Open No. 2004-169967 is known. As shown in FIG. An engagement hole 114 is provided in the peripheral portion of the opening 113 for attaching / detaching the blade 112 provided in 111, and an attaching / detaching means 116 that engages with the engagement hole 114 is provided on the back surface of the orifice 115 rotated and attached to the opening 113. However, when the frame 111 is mounted at a high position on the ceiling surface such as a ceiling-embedded ventilation fan, the position of the engagement hole 114 and the attaching / detaching means 116 is aligned so that the orifice 115 is attached to the frame 111. The operation of pushing and inserting, and further rotating and fixing securely is difficult, and the high static pressure used for the fan 112 with a ceiling-embedded ventilation fan, etc. If you mind blowing blades, wind leakage occurs due to a gap or the engaging hole 114 of the orifice 115 and the frame 111, reduction and noise air volume has a problem that occurs.

  The present invention solves such a conventional problem, and an opening for attaching / detaching a centrifugal blower blade in a narrow and dark space inside a frame mounted at a high position called a ceiling is provided in a casing. It can be opened and closed without using it, improving the cleanability, and even if it has a centrifugal fan with high static pressure and can open and close the opening, it prevents wind leakage and maintains performance An object of the present invention is to provide a ceiling embedded ventilation fan.

  In order to achieve the above object, the ceiling-embedded ventilation fan of the present invention is inserted and attached to the back of the ceiling, and has a box-shaped frame having an opening facing the indoor side on the lower surface, and a suction on the lower surface in the frame. A scroll-shaped casing having a mouth and a discharge port on a side surface; a centrifugal air blowing blade disposed in the casing; and an electric motor that rotationally drives the centrifugal air blowing blade. An orifice having a diameter larger than the outer diameter of the blower blade is provided, and an orifice having a suction port is provided in the opening, and the orifice uses a tool in a space below the casing in the frame from the opening on the lower surface of the frame. It is provided detachably.

  Further, the other means is provided with a locking piece on the outer peripheral portion of the orifice, an engaging portion that engages with the locking piece at a position corresponding to the locking piece of the casing, and pressing the orifice upward. The locking piece is pushed into the engaging portion, and the orifice is attached to the casing.

  In another means, the locking pieces are provided at two positions on the outer peripheral portion of the orifice which are substantially opposed to each other.

  Further, the other means is one of the two locking pieces, wherein one locking piece is elastically deformed, and a finger hook portion is provided at a position opposite to the elastically deforming locking piece. It is configured to pinch the piece and the finger-hanging part with fingers.

  The other means is formed by biasing the position of the center of gravity of the orifice toward the side of the locking piece that is elastically deformed.

  In another means, an indication that the orifice is removed by pinching the finger-hanging portion and the locking piece near the finger-holding portion on the lower surface of the orifice is provided.

  Another means is to make the orifice and the casing different colors.

  Another means is that the casing is formed in a dark color and the orifice is formed in a lighter color than the casing.

  In addition, the other means is provided with a joint portion that overlaps and joins to the back surface of the outer peripheral portion of the orifice and the opening edge of the lower surface of the casing, and a protruding portion that protrudes downward from the outer peripheral portion of the orifice so as to surround the suction port. And an outer peripheral wall that forms a cavity between the projecting portion and the projecting portion.

  Another means is that a first step portion is provided on the back surface of the outer peripheral portion of the orifice, and a second step portion is provided on the opening edge of the lower surface of the casing so as to overlap and join the first step portion. .

  Another means is to provide a hole at the lower end of the cavity formed by the protrusion and the outer peripheral wall.

  Another means is that the cavity is formed so as to be inclined from above toward the hole.

  Another means is that a part of the outer peripheral wall is provided with a positioning shape, and a part of the lower surface of the casing is provided with an outer peripheral surface of the orifice and a positioning rib that contacts either the positioning shape or the outer peripheral wall. It is.

  Another means is that the lower surface of the casing is provided with the outer peripheral surface of the orifice, the positioning shape, and a guide rib that is substantially inscribed in the outer peripheral wall.

  As another means, the guide rib is formed such that the height around the locking piece is lower than the height around the locking piece that elastically deforms.

  Another means is that the shape of the locking piece is a rib-shaped locking piece protruding outward of the outer peripheral wall, and corresponds to the rib-shaped locking piece when the orifice is pressed against the lower surface of the casing. In the vicinity of the engaging portion, a groove portion having a gradient for guiding the rib-shaped locking piece to a normal position of the engaging portion while being in contact with the rib-shaped locking piece is provided.

  Another means is to provide a cylindrical rib projecting in the direction toward the inside of the casing at the opening on the lower surface of the casing.

  According to the present invention, an opening having a diameter larger than the outer diameter of the centrifugal blower blade is provided in the lower surface of the casing, and an orifice having a suction port is provided in the opening. The orifice is a space below the casing in the frame from the opening on the lower surface of the frame. Since the centrifugal blower blade can be taken out from the opening formed by removing the orifice by using a tool without using a tool, the centrifugal blower blade can be removed for cleaning. A ceiling-embedded ventilation fan having an improved effect can be provided.

  In addition, a locking piece is provided on the outer peripheral portion of the orifice, an engagement portion that engages with the locking piece is provided at a position corresponding to the locking piece of the casing, and the locking piece is engaged by pressing the orifice upward. By attaching the orifice to the casing and attaching the orifice to the casing, the orifice can be attached to and detached from the opening for taking out the centrifugal blower blade from the casing with one-touch operation without using a tool. It is possible to provide a ceiling embedded ventilation fan with improved decomposability.

  In addition, since the locking pieces are provided at two positions on the outer periphery of the orifice that are substantially opposite to each other, the orifice cannot be attached to the casing when one of the locking pieces is incompletely engaged. Secure mounting and fixing are possible.

  In addition, one of the two locking pieces is a locking piece that elastically deforms, and a finger-holding portion is provided at a position that opposes in the vicinity of the elastically deforming locking piece. By adopting a structure in which the finger-holding part is pinched with fingers, the orifice can be easily removed by a simple operation with one hand.

  Further, since the center of gravity of the orifice is formed so as to be biased toward the elastically deforming locking piece, the orifice can be stably held.

  In addition, the operation of removing the orifice can be understood without checking the instruction manual by providing an indication that the orifice is removed by pinching the finger-hanging portion and the elastically deforming locking piece near the finger-holding portion on the lower surface of the orifice. be able to.

  In addition, by using different colors for the orifice and the casing, it is possible to easily determine at a glance that the orifice and the casing are separable parts.

  Further, since the casing is formed in a dark color and the orifice is formed in a lighter color than the casing, it is possible to more easily determine at a glance that the orifice and the casing are separable parts.

  In addition, a joint that overlaps and joins the outer periphery of the orifice and the opening edge of the lower surface of the casing is provided, and a protrusion that protrudes downward from the outer periphery of the orifice so as to surround the suction port is provided. In order to be able to remove and clean the centrifugal blower blades by providing an outer peripheral wall that forms a cavity between the projecting portion and the outside, the orifice can be attached to and detached from the casing. Since wind leakage generated from the gap can be reduced, the air blowing performance can be maintained, and furthermore, noise generated by a small amount of wind leakage can be insulated in the cavity, and noise generation can be prevented. .

  In addition, a first step portion is provided on the rear surface of the outer peripheral portion of the orifice, and a second step portion that overlaps and joins the first step portion is provided on the opening edge of the lower surface of the casing. Since the wind leakage generated from the gap due to the detachable structure can be further reduced, the air blowing performance can be maintained.

  Further, by providing a hole in the lower end portion of the cavity formed by the protruding portion and the outer peripheral wall, it is possible to reduce the blowing noise by resonance mute.

  In addition, since the cavity was formed so as to incline from above toward the hole, water droplets inside the cavity flowed down from the hole, preventing moisture from accumulating inside the cavity, thereby preventing mold generation and propagation of germs. Can be suppressed.

  In addition, a part of the outer peripheral wall has a positioning shape, and a part of the lower surface of the casing is provided with a positioning rib that contacts either the outer peripheral surface of the orifice and the positioning shape or the outer peripheral wall. It can be prevented from being mounted in an incomplete state in the direction of the head.

  Further, by providing the outer peripheral surface of the orifice, the positioning shape, and the guide rib substantially inscribed in the outer peripheral wall on the lower surface of the casing, the normal mounting direction of the orifice can be easily confirmed, and the operability of the orifice mounting is improved.

  In addition, the guide rib is formed so that the height around the locking piece is lower than the height around the locking piece that is elastically deformed, so that engagement between the locking piece and the elastically deforming locking piece and the engaging portion is not achieved. The orifice is not held in the casing in a complete state, and the orifice can be securely attached and fixed.

  In addition, the shape of the locking piece is a rib-shaped locking piece that protrudes outward from the outer peripheral wall, and when the orifice is pressed against the lower surface of the casing, the engagement portion corresponding to the rib-shaped locking piece In the vicinity, a groove portion having a gradient that guides the rib-shaped locking piece to the normal position of the engaging portion while contacting the rib-shaped locking piece is provided, so that the orifice The position can be automatically guided to the normal position, and the operability of mounting the orifice is improved.

  Further, by providing a cylindrical rib projecting toward the inside of the casing in the opening on the lower surface of the casing, it is possible to prevent water droplets adhering in the casing from dropping to the indoor side from the opening.

  The ceiling-embedded ventilation fan according to claim 1 of the present invention is provided with an opening having a diameter larger than the outer diameter of the centrifugal blower blade on the lower surface of the casing, and an orifice having a suction port formed in the opening. It is detachable from the opening in the space below the casing in the frame without using a tool. It is installed at a high position on the back of the ceiling, and the tool is used for the casing in the dark and narrow frame space. It is possible to attach and remove without performing the operation, and it is possible to easily form an opening in which the centrifugal blower blade can be attached to and detached from the lower surface of the casing.

  The ceiling-embedded ventilation fan according to claim 2 of the present invention is provided with a locking piece on the outer peripheral portion of the orifice, and an engaging portion that engages with the locking piece at a position corresponding to the locking piece of the casing. This is a structure that attaches the orifice to the casing by pressing the orifice upward and engaging the engaging piece with the engaging part, and the orifice is pushed into the casing in one direction without using a tool. And can be removed without using a tool, and an opening in which the centrifugal blower blade can be attached and detached is easily formed on the lower surface of the casing.

  In the ceiling-embedded ventilation fan according to claim 3 of the present invention, the locking pieces are provided at two positions on the outer peripheral portion of the orifice substantially opposite to each other. Since the orifice cannot be attached to the casing in an incomplete state and falls, the orifice cannot be attached to the casing incompletely.

  In the ceiling-embedded ventilation fan according to claim 4 of the present invention, one of the two locking pieces is a locking piece that is elastically deformed, and is opposed in the vicinity of the elastically deforming locking piece. A finger-holding part is provided at the position, and the elastically deforming locking piece and the finger-holding part are pinched with fingers, and the locking piece elastically deforming with the finger of one hand and the finger-holding part are operated. Thus, the engagement between the elastically deforming locking piece and the engaging portion is released.

  The ceiling-embedded ventilation fan according to claim 5 of the present invention is formed by biasing the position of the center of gravity of the orifice to the side of the elastically deforming locking piece and elastically deforming with the finger of one hand. When the orifice is removed by an operation of pinching the piece and the finger-hanging portion, the position where the center of gravity of the orifice is biased is supported by the finger.

  In the ceiling-embedded ventilation fan according to claim 6 of the present invention, an indication that the orifice is removed by pinching the finger-hanging portion and the locking piece in the vicinity of the finger-hanging portion on the lower surface of the orifice is provided. It is possible to visually check the orifice without checking the instruction manual.

  In the ceiling-embedded ventilation fan according to claim 7 of the present invention, the orifice and the casing have different colors. When the orifice integrated with the casing is removed, the casing and the orifice are separate parts. You can see at a glance.

  In the ceiling-embedded ventilation fan according to claim 8 of the present invention, the casing is formed in a dark color and the orifice is formed in a lighter color than the casing. When the orifice integrated with the casing is removed, it is dark. With respect to the casing formed with the color, the orifice formed with the bright color becomes conspicuous due to the illusion of the contraction color and the expansion color.

  The ceiling-embedded ventilation fan according to claim 9 of the present invention is provided with a joint portion that is superposed and joined to the back surface of the outer peripheral portion of the orifice and the opening edge of the lower surface of the casing, and a suction port is provided from the outer peripheral portion of the orifice. A projecting portion projecting downward is provided so as to surround, and an outer peripheral wall that forms a cavity between the projecting portion and the outer periphery of the projecting portion is provided. It is possible to reduce the occurrence of wind leakage from the gap due to the pressure generated by the air blowing, and to reduce the small amount of generated wind leakage sound from being directly propagated from the opening of the frame by the cavity.

  In the ceiling-embedded ventilation fan according to claim 10 of the present invention, the first step portion is provided on the back surface of the outer peripheral portion of the orifice, and the first step portion is overlapped and joined to the opening edge of the lower surface of the casing. Two stepped portions are provided, and the first stepped portion and the second stepped portion form a three-sided superposition joint, and wind leakage from the gap is caused by the pressure generated by the rotation of the centrifugal blower blades. The generation is further reduced.

  The ceiling-embedded ventilation fan according to claim 11 of the present invention has a hole in the lower end portion of the cavity formed by the projecting portion and the outer peripheral wall, and is generated by blowing air from a centrifugal blowing blade. The noise radiated from the suction port is resonantly silenced by the hole and the cavity.

  In the ceiling-embedded ventilation fan according to claim 12 of the present invention, the cavity is formed so as to incline from above toward the hole, and water droplets generated by dew condensation or the like inside the cavity are holed by the inclination. And has the effect of being discharged out of the cavity.

  Moreover, the ceiling-embedded ventilation fan according to claim 13 of the present invention is provided with a positioning shape on a part of the outer peripheral wall, and on the outer peripheral surface of the orifice, the positioning shape, or the outer peripheral wall on a part of the lower surface of the casing. If the orientation of the orifice is not the normal direction when the orifice is installed, the positioning rib and the outer peripheral surface of the orifice, the positioning shape, and the shape of the outer peripheral wall interfere with each other and the casing It has the effect that it cannot be attached.

  In the ceiling-embedded ventilation fan according to claim 14 of the present invention, the lower surface of the casing is provided with a guide rib that is substantially inscribed in the outer peripheral surface and positioning shape of the orifice and the outer peripheral wall. It has the effect that the orientation of the orifice can be confirmed and matched with the eyes so as to be in a normal direction according to the guide rib of the casing.

  In the ceiling-embedded ventilation fan according to claim 15 of the present invention, the guide rib is formed so that the height around the locking piece is lower than the height around the locking piece that elastically deforms, and the two locking pieces In the state that is not correctly fixed to the engagement hole, the outer peripheral surface of the orifice, the outer peripheral wall, and the opposite portions of the convex portion do not come into contact with the inner peripheral surface of the guide rib.

  In the ceiling-embedded ventilation fan according to claim 16 of the present invention, the shape of the locking piece is a rib-shaped locking piece that protrudes outward from the outer peripheral wall, and the orifice is pressed against the lower surface of the casing. In the vicinity of the engaging portion corresponding to the rib-shaped locking piece, a groove portion having a gradient for guiding the rib-shaped locking piece to the normal position of the engaging portion while contacting the rib-shaped locking piece. The rib-shaped locking piece that is in contact with the groove portion is guided to the normal position of the engaging portion along the gradient of the groove portion.

  According to a seventeenth aspect of the present invention, the ceiling-embedded ventilation fan is provided with a cylindrical rib projecting toward the inside of the casing at the opening on the lower surface of the casing, and water droplets generated by condensation on the bottom surface of the casing. However, it will be stopped by the cylindrical rib.

  Hereinafter, embodiments of the present invention will be described with reference to FIGS.

(Embodiment 1)
Embodiment 1 of the present invention will be described with reference to FIG. 1 and FIG.

  As shown in the figure, a box-like frame 3 attached to the back of the ceiling, connected to the duct 1 communicating with the outside on the side surface, and a suction port facing the indoor side on the lower surface, A scroll-like casing 4 having a suction port on the lower surface and a discharge port communicating with the adapter 2 on the side surface, and disposed inside the casing 4 for discharging indoor air to the outdoors via the duct 1 The casing 4 is provided with an opening 7 having a diameter larger than the outer diameter of the centrifugal blowing blade 5 on the lower surface. An orifice 9 having a suction port 8 having a diameter smaller than the outer diameter of the centrifugal blower blade 5 is provided on the lower surface, and locking pieces 10 are provided at four locations on the outer periphery of the orifice 9, corresponding to the locking piece 10 of the casing 4. Locking piece 10 An engaging portion 11 which engages provided, pushing the engaging piece 10 with the engaging portion 11 is pressed against the orifice 9 upward, a structure for mounting the orifice 9 to the casing 4.

  In the above configuration, when cleaning the indoor dust adhering to the centrifugal blower blade 5 due to a long operation, the engagement between the locking piece 10 and the engaging portion 11 is released by pulling the orifice 9 downward by hand. The orifice 9 can be removed from the casing 4 without using a tool in the space of the dark and narrow frame 3 provided at a high position on the ceiling, and by removing the orifice 9, the centrifugal blower blade 5 is placed on the lower surface of the casing 4. An opening 7 that can be taken out can be formed.

  When the orifice 9 is attached to the casing 4, the locking pieces 10 and the engaging portions 11 are aligned to push the orifice 9 upward into the opening 7 on the lower surface of the casing 4. And the engaging portion 11 can be engaged and can be easily attached.

  Thus, according to the ceiling-embedded ventilation fan of Embodiment 1 of the present invention, the centrifugal blower blade 5 can be removed and cleaned from the opening 7 formed by removing the orifice 9 without using a tool, Provided is a ceiling-embedded ventilation fan that can be attached / detached with respect to the opening 7 by one-touch operation in one direction without using a tool, is excellent in disassembly and assembly, and has improved cleaning properties. It will be possible.

  In the first embodiment, the number of places where the locking pieces 10 and the engaging portions 11 are provided is four. However, the present invention is not limited to this, and needless to say, a plurality of places may be used.

(Embodiment 2)
In the second embodiment of the present invention, the same components as those in the first embodiment are denoted by the same reference numerals, and detailed description thereof is omitted.

  As shown in FIGS. 3 and 4, locking pieces 10 are provided at two positions on the outer peripheral portion of the orifice 9 </ b> A that are substantially opposite to each other, and engage with the locking pieces 10 at positions corresponding to the locking pieces 10 of the casing 4 </ b> A. An engaging portion 11 is provided.

  Further, the orifice 9A and the casing 4A have different colors.

  Further, a joint 12 is provided to be joined to each other on the rear surface of the outer peripheral portion of the orifice 9A and the opening 7 edge of the lower surface of the casing 4A, and the protrusion protrudes downward from the outer peripheral portion of the orifice 9A so as to surround the suction port 8 13, an outer peripheral wall 15 that forms a cavity 14 between the outer peripheral wall 15 and the projecting portion 13 is provided outside the projecting portion 13, and a convex portion 16 that has a positioning shape is provided on the outer peripheral wall 15. Positioning ribs 17 that abut the convex portions 16 are provided.

  In the above configuration, when the orifice 9A is attached to the casing 4A, the locking pieces 10 provided at two positions substantially opposite to the outer periphery of the casing 4A and the engaging portions 11 corresponding to the locking pieces 10 are In the state where the engagement of either one of the locking pieces 10 is incomplete, the orifice 9A cannot be attached to the casing 4A and falls, and the two locking pieces 10 and the engaging portion 11 are moved. By being completely engaged, the orifice 9A and the casing 4A are attached and fixed.

  If the orientation of the orifice 9A is not the normal direction, when the orifice 9A is pushed into the casing 4A, the positioning rib 17 provided on the lower surface of the casing 4A interferes with the convex portion 16 of the orifice 9A, and the orifice 9A Cannot be fixed to the casing 4A.

  Further, since the orifice 9A integrated with the casing 4A is formed in a color different from that of the casing 4A, it can be easily determined at a glance that it is a separable part.

  Further, due to the superposition joining at the joint 12 at the edge 7 of the opening on the lower surface of the orifice 9A and the lower surface of the casing 4A, the static pressure generated by the rotation of the centrifugal fan 5 of high static pressure causes the clearance between the orifice 9A and the casing 4A. The occurrence of wind leakage is reduced, and a small amount of sound of the generated wind leakage is also released into the cavity 14 formed by the protruding portion 13 and the outer peripheral wall 15 of the orifice 9A. It will be prevented from being released directly into the room.

  As described above, according to the ceiling-embedded ventilation fan of the second embodiment of the present invention, the mounting and fixing of the orifice 9A to the casing 4A in an incomplete state is eliminated, and the mounting and fixing can be surely performed. It is possible to easily determine at a glance that the orifice 9A integrated with the orifice 9A is a separable component, and it is possible to prevent the orifice 9A from being attached to the casing 4A in an incorrect direction in an incomplete state.

  And even if the orifice 9A is detachable from the casing 4A, it is possible to reduce the wind leakage generated from the gap by the joint portion 12, so that the blowing performance can be maintained, and furthermore, the noise generated by a small amount of wind leakage is also Since the sound can be insulated by the cavity 14 and the generation of noise can be prevented, it is possible to provide a ceiling-embedded ventilation fan that has no degradation in performance, is excellent in decomposability and assembly, and has improved cleanability. Become.

  Furthermore, if it is set as the structure which provides the sealing part formed with a soft elastic material, a foam material, etc. in the junction part 12, the effect of further wind-leak prevention can be acquired.

  Note that the positioning shape is not limited to the convex portion 16, and may be a shape that is not continuous with the outer peripheral wall 15, such as a concave shape or a flat shape, and that determines the normal direction in which the orifice 9 </ b> A and the casing 4 </ b> A are attached in one direction. There is no difference in the effects.

  In the second embodiment, the convex portion 16 provided on the outer peripheral wall 15 is in contact with the positioning rib 17 of the casing 4A. However, it is in contact with either the outer peripheral wall 15 or the outer peripheral surface of the orifice 9A. May be.

(Embodiment 3)
In the third embodiment of the present invention, the same components as those in the first and second embodiments are given the same reference numerals, and detailed description thereof is omitted.

  As shown in FIGS. 5 to 9, the casing 4B is formed in a dark color, the orifice 9B is formed in a lighter color than the casing 4B, and one of the two locking pieces 10 is a locking piece 10A that is elastically deformed. The other is a rib-shaped locking piece 10B that protrudes outward from the outer peripheral wall 15, and a finger hooking portion 18 is provided at a position facing the locking piece 10A in the vicinity of the locking piece 10A. A marking 19 is provided as an indication that the orifice 9B is to be removed by pinching the stop piece 10A and the finger hook portion 18, and the position of the center of gravity of the orifice 9B is biased toward the locking piece 10A.

  Further, the first step portion 20 is provided on the rear surface of the outer peripheral portion of the orifice 9B, the second step portion 21 is provided on the edge of the opening 7 on the lower surface of the casing 4 and overlapped with the first step portion 20, and the protrusion portion 13 is provided. A slit-shaped hole 22 is provided at the lower end portion of the cavity 14 formed from the outer peripheral wall 15 and the cavity 14 is formed so as to be inclined from above toward the hole 22. A frame-shaped guide rib 23 that is substantially inscribed on the outer peripheral wall 15 and the convex portion 16 is provided, and the guide rib 23 is formed such that the height of the guide rib 23 is lower in the vicinity of the locking piece 10B of the orifice 9B than in the vicinity of the locking piece 10A. Of the engaging portion 11B corresponding to the locking piece 10B when the orifice 9B is pressed against the lower surface of the casing 4B. By the side, it is provided with a groove portion 24 provided with a gradient to be brought into the engaging portion 11B while being in contact with the locking piece 10B, and provided with a cylindrical rib 25 protruding inward of the casing 4B at the opening 7 edge of the lower surface of the casing 4B. The configuration is as follows.

  In the above configuration, when the orifice 9B is removed from the casing 4B, the orifice 9B is conspicuous due to the illusion of the contracted color and the expanded color of the orifice 9B formed in a bright color with respect to the casing 4B formed in a dark color. According to the indication of the marking 19 provided in the vicinity of the locking piece 10A and the finger hooking portion 18, the engagement state with the engaging portion 11A is released by the operation of pinching the locking piece 10A and the finger hooking portion 18 with the finger of one hand. Thus, the fixing of the orifice 9B and the casing 4B is released, and the vicinity of the center of gravity of the orifice 9B is supported by a finger.

  Further, during the operation of the ceiling-embedded ventilation fan, the first stepped portion 20 and the second stepped portion 21 form a three-sided superposed joint, and static electricity generated by the rotation of the high static pressure centrifugal blower blade 5 is formed. The occurrence of wind leakage from the gap between the orifice 9B and the casing 4B due to pressure is further reduced, and noise generated by a small amount of wind leakage is released into the cavity 14 formed by the protrusion 13 and the outer peripheral wall 15 of the orifice 9B. Therefore, it will be prevented from being released directly from the suction port of the frame 3 to the indoor side, and the noise generated by the blowing by the rotation of the centrifugal blower blade 5 and radiated from the suction port 8 of the orifice 9B, Resonance is silenced by the cavity 14 formed by the protruding portion 13 of the orifice 9B and the outer peripheral wall 15 and the hole 22 provided in the lower end portion of the cavity 14.

  Further, water droplets generated by condensation or the like inside the cavity 14 flow toward the hole 22 due to the inclination of the cavity 14 and are discharged out of the cavity 14.

  Further, when the orifice 9B is attached, the shapes of the guide rib 23 and the outer peripheral surface of the orifice 9B, the outer peripheral wall 15 and the convex portion 16 are matched, and the normal direction of the orifice 9B can be visually confirmed and understood. In a state where one of the stop pieces 10A, B is not correctly engaged with the engaging portions 11A, B, the outer peripheral surface of the orifice 9B, the outer peripheral wall 15, and the opposing portions of the convex portion 16 are in contact with the inner peripheral surface of the guide rib 23. Therefore, when the orifice 9B is pressed against the lower surface of the casing 4B, the locking piece 10B and the orifice 9B are in contact with the engaging portion 11B and the guide rib 23 along the gradient while the locking piece 10B is in contact with the groove 24. The engaging piece 10A is pushed into the engaging portion 11A while being elastically deformed, and the engaging piece 10A is engaged with the engaging portion. Causing simultaneously clicking sound when engaging the 1A.

  Furthermore, water droplets generated by condensation or the like inside the casing 4B are blocked by the cylindrical ribs 25.

  Thus, according to the ceiling-embedded ventilation fan of the third embodiment of the present invention, it is possible to easily determine at a glance that the orifice 9B and the casing 4B are separable parts. It is possible to understand the procedure for removing the orifice 9B from the casing 4B without confirming the instructions and the like, and the orifice 9B can be removed with one touch by the operation of pinching the locking piece 10A and the finger-hanging portion 18 with one finger. Since the vicinity of the center of gravity of the orifice 9B is pinched with a finger, it is easy to hold the orifice 9B, and it is possible to provide a ceiling-embedded ventilation fan with further improved decomposability and operability and further improved cleanability. Become.

  Further, even if the orifice 9B is detachable from the casing 4B, the wind leakage generated from the gap of the joint portion 12A can be further reduced by the superposition of the three surfaces, so that the air blowing performance can be maintained and generated by a small amount of wind leakage. The noise can be released into the cavity 14 to be sound-insulated, and the blowing noise radiated from the suction port 8 is resonantly silenced by the cavity 14 and the hole 22 and can be further reduced in noise. It is possible to provide a ceiling-embedded ventilation fan that has high noise, high performance, excellent disassembly and assembly, and improved cleanability.

  Further, moisture accumulation in the cavity 14 due to water droplets generated in the cavity 14 due to condensation or the like can be prevented, and generation of mold and propagation of germs in and around the cavity 14 can be suppressed.

  In addition, it is possible to prevent the orifice 9B from being attached in the wrong direction or to be attached in an incomplete state, the normal attachment direction of the orifice 9B can be easily confirmed, and the displacement of the position when the orifice 9B is attached can be prevented. It can be corrected, and it can be confirmed with the ear that the orifice 9B is fixed to the casing 4B by clicking sound. On the other hand, water droplets generated by condensation or the like inside the casing 4B drop from the opening 7 to the indoor side. Therefore, it is possible to provide a ceiling-embedded ventilation fan that is further improved in assembly, operability, and safety.

  The present invention has good parts disassembly, assembly, and operability when cleaning the centrifugal fan blades, and there is little wind leakage from the casing suction port area, and noise emitted from the suction port can be reduced. It is useful for ventilation devices, centrifugal blowers, and air conditioners that require cleaning of the centrifugal blower blades.

Sectional drawing which shows the ceiling embedded type ventilation fan of Embodiment 1 of this invention The perspective view which shows the attachment or detachment state of the orifice of the ceiling embedded ventilation fan, and the centrifugal fan Sectional drawing which shows the ceiling embedded type ventilation fan of Embodiment 2 of this invention The perspective view which shows the attachment or detachment state of the orifice of the ceiling embedded ventilation fan, and the centrifugal fan Sectional drawing which shows the ceiling embedded type ventilation fan of Embodiment 3 of this invention Part A detail view of FIG. Side sectional view showing the attachment and detachment state of the orifice and centrifugal fan of the ceiling-mounted ventilation fan Sectional view showing the height of the guide rib of the ceiling-mounted ventilation fan Sectional drawing which shows the effect | action of the groove part at the time of orifice installation of the ceiling embedded ventilation fan Sectional view showing a conventional ceiling-mounted ventilation fan A perspective view showing a conventional ventilation fan for pipes

Explanation of symbols

3 Frame 4 Casing 4A Casing 4B Casing 5 Centrifugal Blower 6 Electric Motor 7 Opening 8 Suction Port 9 Orifice 9A Orifice 9B Orifice 10 Locking Piece 10A Locking Piece 10B Locking Piece 11 Engaging Part 11A Engaging Part 11B Engaging Part 12 Joining part 12A Joining part 13 Protruding part 14 Cavity 15 Outer peripheral wall 16 Convex part 17 Positioning rib 18 Finger hook part 19 Marking 20 First step part 21 Second step part 22 Hole 23 Guide rib 24 Groove part 25 Cylindrical rib

Claims (17)

A box-like frame that is inserted and attached to the back of the ceiling and has an opening facing the indoor side on the lower surface, and a scroll-like casing that is disposed in the frame and has a suction port on the lower surface and a discharge port on the side surface And a centrifugal blower blade disposed in the casing, and an electric motor that rotationally drives the centrifugal blower blade. The casing has an opening having a diameter larger than the outer diameter of the centrifugal blower blade on the lower surface. An orifice having the suction port formed therein is provided, and the orifice is detachably provided in the space below the casing in the frame without using a tool from the opening on the lower surface of the frame. Shaped ventilation fan. A locking piece is provided on the outer periphery of the orifice, an engaging portion is provided at a position corresponding to the locking piece of the casing, and the locking piece is pushed upward by pressing the orifice upward. The ceiling-embedded ventilation fan according to claim 1, wherein the ceiling-mounted ventilation fan is attached to the casing by being pushed into a joint portion. The ceiling-embedded ventilation fan according to claim 2, wherein the locking pieces are provided at two positions on the outer peripheral portion of the orifice that are substantially opposite to each other. One locking piece of the two locking pieces is used as an elastically deforming locking piece, and a finger hooking portion is provided at a position opposite to the elastically deforming locking piece, and the elastically deforming locking piece and the finger hook are provided. The ceiling-embedded ventilation fan according to claim 3, wherein the fan is sandwiched between fingers. The ceiling-embedded ventilation fan according to claim 4, wherein the position of the center of gravity of the orifice is biased toward the side of the locking piece that is elastically deformed. The ceiling-embedded ventilation fan according to claim 4, wherein an indication that the orifice is removed by pinching the finger-hanging portion and the locking piece is provided near the finger-holding portion on the lower surface of the orifice. The ceiling-embedded ventilation fan according to any one of claims 1 to 6, wherein the orifice and the casing have different colors. 8. The ceiling-embedded ventilation fan according to claim 7, wherein the casing is formed in a dark color and the orifice is formed in a lighter color than the casing. Provided on the rear surface of the outer peripheral portion of the orifice and the opening edge of the lower surface of the casing are joint portions that are superposed on each other and provided with a protruding portion that protrudes downward from the outer peripheral portion of the orifice so as to surround the suction port. The ceiling-embedded ventilation fan according to claim 1, further comprising an outer peripheral wall that forms a cavity between the projecting portion and the outer peripheral wall. 10. The ceiling-embedded type according to claim 9, wherein a first step portion is provided on the back surface of the outer peripheral portion of the orifice, and a second step portion that is overlapped and joined to the first step portion is provided on an opening edge of the lower surface of the casing. Ventilation fan. The ceiling-embedded ventilation fan according to claim 9, wherein a hole is provided in a lower end portion of a cavity formed by the protruding portion and the outer peripheral wall. The ceiling-embedded ventilation fan according to claim 11, wherein the cavity is formed so as to be inclined from above toward the hole. The ceiling embedding according to claim 9, wherein a part of the outer peripheral wall is provided with a positioning shape, and a part of the lower surface of the casing is provided with a positioning rib that contacts either the outer peripheral surface of the orifice, the positioning shape, or the outer peripheral wall. Built-in ventilation fan. The ceiling-embedded ventilation fan according to claim 9 or 13, wherein a guide rib that is substantially inscribed in the outer peripheral surface and positioning shape of the orifice and the outer peripheral wall is provided on the lower surface of the casing. The ceiling-embedded ventilation fan according to any one of claims 9, 13, and 14, wherein the guide rib is formed so that a height around the locking piece is lower than a height around the locking piece that is elastically deformed. The shape of the locking piece is a rib-shaped locking piece that protrudes outward from the outer peripheral wall, and when the orifice is pressed against the lower surface of the casing, it is in the vicinity of the engaging portion corresponding to the rib-shaped locking piece. The ceiling-embedded ventilation fan according to claim 9, further comprising a groove portion having a slope that guides the rib-shaped locking piece to a normal position of the engaging portion while abutting the rib-shaped locking piece. . The ceiling-embedded ventilation fan according to claim 9, wherein a cylindrical rib projecting toward the inside of the casing is provided in an opening on a lower surface of the casing.

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