JP2010164252A - Ceiling embedded ventilation fan - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To open/close an opening for attachment/detachment of a centrifugal air blowing blade in a narrow space within a frame installed under the roof without using a tool, to prevent wind leakage and to maintain performance. <P>SOLUTION: An orifice 9 forming a suction port 8 on the lower face of a casing 4, a suction port outer peripheral wall 11 extended downwardly from the outer peripheral edge of the orifice 9, a lower face part 12 extended outwardly from the lower end of the suction port outer peripheral wall 11 and having an outer periphery with a shape approximately the same as that of the inner peripheral face of the frame 3 and an outer peripheral wall 13 extended upwardly from the outer peripheral edge of the lower face part 12 are integrally formed. An orifice unit 10 including an opened recess 14 on the upper side is detachably provided in the casing 4 without using a tool. Thus, this can facilitate attachment/detachment of the centrifugal air blowing blade 5 to improve cleaning performance. Even if minute amount of wind is leaked from a jointing part of the orifice unit 10 and the casing 4 to generate noise, the leaked wind is made to flow to the recess 14 to prevent propagation of the noise to the indoor space. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

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

  Conventionally, what was described in patent document 1 is known as an example of this kind of ceiling-embedded ventilation fan.

  The ceiling-embedded ventilation fan will be described below with reference to FIG.

As shown in the figure, 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, and a frame 104 In the inside, there are provided a scroll-like 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 composed.
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 / detaches a blade, for example, a ventilation device described in Japanese Patent Application Laid-Open No. 2004-169967 is known. This ventilation device is attached to a frame 111 as shown in FIG. An engagement hole 114 is provided in the periphery of the opening 113 for attaching / detaching the included blade 112, and attachment / detachment means 116 for engaging with the engagement hole 114 is provided on the back surface of the orifice 115 that is pivotally attached to the opening 113. However, when the frame 111 is mounted at a high position on the ceiling surface like a ceiling-embedded ventilation fan, the position of the engagement hole 114 and the attaching / detaching means 116 is aligned, and the orifice 115 is pushed onto the frame 111. It is difficult to perform the operation of inserting and then rotating and fixing securely. Furthermore, the high-pressure centrifugal transfer using the blade 112 in a ceiling-embedded ventilation fan or the like is difficult. If you blade, the 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 uses a tool in the casing with an opening for attaching / detaching the centrifugal blower blade in a narrow space inside the frame mounted at a high position called the ceiling. Providing a ceiling-embedded ventilation fan that can be installed and opened, and even if the casing opening is opened and closed, air leakage can be prevented, performance can be maintained, and mounting is improved The purpose is to do.

  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, removably joined to the opening to form the suction port, a suction port outer peripheral wall extending downward from an outer peripheral end of the orifice, and the suction port outside A lower surface portion that extends outward from the lower end of the peripheral wall, and a lower surface portion whose outer peripheral shape is substantially the same shape as the inner peripheral surface of the frame, and an outer peripheral wall that extends upward from the outer peripheral end of the lower surface portion are integrated. Forming the outer periphery of the suction port And an orifice unit having a recess opened upward from the lower surface portion and the outer peripheral wall. The orifice unit is detachably provided in the casing in the space below the opening of the lower surface of the frame without using a tool. .

  In another aspect, the outer peripheral end of the lower surface portion of the orifice unit extends to the inner peripheral surface of the frame, and extends upward along the inner peripheral surface of the frame to form an outer peripheral wall. A cavity including a recess formed in the unit is formed in the frame.

  Another means is that a slit is provided at the lower end portion of the suction port outer peripheral wall of the orifice unit so as to communicate the suction port side with the inside of the recess.

  In another means, the lower surface portion is provided with an inclination toward the slit so that the slit is positioned at the lowest position of the lower surface portion.

  Another means is a ceiling-embedded ventilation fan in which an air inlet for sucking air from other chambers is provided on the side wall of the frame, and an inclined surface having a higher outer peripheral side is provided on the lower surface of the orifice unit. Is.

  Another means is that the outer peripheral portion of the lower surface of the orifice unit is formed with a step.

  In another aspect, the first engaging piece is provided on one side of the orifice unit, and the second engaging piece is provided on the side facing the one side, respectively, and the first engagement of the casing is provided. A first engagement portion and a second engagement portion that engage with the first locking piece and the second locking piece are provided at positions corresponding to the stopping piece and the second locking piece, The first locking piece has a hook shape.

  Another means is to form the first locking piece in a U shape.

  The other means is a ceiling-embedded ventilation fan in which a grill that covers the lower surface opening of the frame from below is detachably attached to a mounting portion provided inside the frame by a mounting spring provided in the grill, Are attached in the vicinity of the first locking piece and the second locking piece.

  Further, the other means is a locking piece that elastically deforms the second locking piece, and is provided with a finger hook portion at a position facing the second locking piece in the vicinity of the second locking piece, It is configured to pinch the finger grip with the finger.

  Another means is that the second locking piece and the finger-hanging portion are arranged in a direction parallel to the inner wall surface of the frame.

  The other means is configured to elastically deform the finger-hanging portion.

  According to another aspect of the present invention, a plurality of pairs of first locking pieces and first engaging portions that engage with the first locking pieces are provided, and the first engagement in the different pairs of the plurality of pairs is provided. The stop piece or the first engaging portion has a different size.

  In addition, the other means is provided with a plurality of pairs of first locking pieces and first engaging portions that engage with the first locking pieces, and the plurality of first locking pieces or the first locking pieces The pitches from the center of each main body of the plurality of first engaging portions are different.

  In another means, the orifice unit removal order and method markings are provided on the lower surface of the orifice unit.

  Another means is that the orifice unit and the casing have different colors.

  Another means is to make the casing darker and the orifice unit lighter than the casing.

  According to the present invention, the casing has an opening having a diameter larger than the outer diameter of the centrifugal blower blade on the lower surface, an orifice that is detachably joined to the opening to form a suction port, and extends downward from the outer peripheral end of the orifice. The outer peripheral wall of the suction port, the lower end portion of the outer peripheral wall of the suction port, and the lower surface portion of the outer peripheral portion extending substantially upward from the outer peripheral end of the lower surface portion. An orifice unit that is integrally formed with the outer peripheral wall provided and has a recess that opens upward from the outer peripheral wall of the suction port, the lower surface, and the outer peripheral wall, and a tool is used in the space below the opening in the frame from the lower surface of the frame It is easy to remove and install the orifice unit without detaching it from the casing, and the centrifugal blower blade can be attached and removed in a narrow space inside the frame mounted at a high position on the ceiling. Easier and easier to clean, and by making the orifice detachable from the casing, even if a small amount of wind leaks from the joint and causes noise, the leaked wind will remain in the orifice unit. Therefore, noise does not propagate into the room on the user side, and the ceiling-embedded ventilation fan can be provided which has an effect of preventing an increase in noise.

  In addition, the outer peripheral end of the lower surface portion of the orifice unit is extended to the inner peripheral surface of the frame, is extended upward along the inner peripheral surface of the frame to form an outer peripheral wall, and the concave portion formed in the orifice unit is formed. By forming a cavity that includes this in the frame, it is easier to remove and install the orifice unit, and it is easier to clean. In addition, noise caused by a small amount of wind leakage from the joint between the casing and the orifice is further attenuated. Will do.

  In addition, by providing a slit in the lower end of the outer peripheral wall of the suction port of the orifice unit that connects the suction port side and the inside of the recess, the noise radiated from the suction port is resonated in the recess and the blowing noise is reduced. Noise can be achieved.

  In addition, by providing the lower surface with an inclination toward the slit so that the slit is positioned at the lowest position of the lower surface, water droplets generated in the recess of the orifice unit are discharged from the slit, and moisture is trapped inside the cavity. By preventing it, generation | occurrence | production of mold | fungi and propagation of miscellaneous bacteria can be suppressed.

  In addition, in the ceiling-embedded ventilation fan provided with an intake port for sucking air from the other chamber on the side wall of the frame, the lower surface of the orifice unit is provided with an inclined surface with a higher outer peripheral side, thereby Even if it is a ceiling-embedded ventilation fan of the type that simultaneously ventilates, the orifice unit does not hinder the blowing from other rooms, and the blowing performance can be maintained.

  Further, since the outer peripheral portion of the lower surface portion of the orifice unit is formed with a step, rigidity is increased, the shape is stabilized, and attachment to the casing is facilitated.

  Also, a first locking piece is provided on one side of the orifice unit, and a second locking piece is provided on the side facing the one side, respectively, and the first locking piece and the second locking piece of the casing are provided. A first engagement portion and a second engagement portion that engage with the first locking piece and the second locking piece are provided at a position corresponding to the locking piece, and the first locking piece is a hook. By adopting the shape, the orifice unit does not come out of the casing even if the second locking piece is removed, so the orifice unit can be removed with one hand.

  Moreover, the fall prevention function at the time of attachment or detachment of an orifice unit improves by making the 1st latching piece into the U-shape.

  In addition, since the grill that covers the lower surface opening of the frame from below is attached in the vicinity of the first locking piece and the second locking piece, the shape of the casing can be simplified and the material can be reduced. Moreover, since the orifice unit is mounted at the same location as the grill, the mounting direction is easy to understand.

  Further, the second locking piece is an elastically deformable locking piece, a finger hooking portion is provided at a position facing the second locking piece in the vicinity, and the second locking piece and the finger hooking portion are sandwiched between fingers. With the pinching configuration, with the first locking piece locked, an operation of pinching the second locking piece and the finger-holding part with the finger of one hand, The orifice unit can be attached and detached.

  In addition, since the second locking piece and the finger-hanging portion are arranged in a direction parallel to the inner wall surface of the frame, more reliable mounting properties can be obtained while ensuring low noise.

  In addition, since the finger-hanging portion is configured to be elastically deformed, the second locking piece is elastically deformed with a larger stroke while ensuring the maximum recess of the orifice unit in a limited space in the frame. Therefore, it is possible to perform a more reliable attaching / detaching operation while reducing noise.

  Also, a plurality of pairs of first locking pieces and first engaging portions that engage with the first locking pieces are provided, and the first locking pieces in the different pairs or the first engagement pieces are provided. Since the joint portions have different sizes, it is possible to prevent the orifice unit from being erroneously attached upside down.

  In addition, a plurality of pairs of first locking pieces and first engaging portions that engage with the first locking pieces are provided, and a plurality of first locking pieces or a plurality of first engagements are provided. It is possible to prevent the orifice unit from being erroneously attached upside down by the different pitches from the center of each body in the section.

  In addition, by providing the orifice unit removal order and method markings on the lower surface of the orifice unit, the operation method can be understood and the maintenance workability can be improved without referring to the instruction manual.

  In addition, by using different colors for the orifice unit and the casing, it can be determined at a glance that the orifice unit and the casing are separable parts, and the operation becomes easy.

  In addition, by making the casing darker and the orifice unit lighter than the casing, it becomes easier to distinguish at a glance that the orifice unit and the casing are separable parts.

  In the ceiling-embedded ventilation fan according to claim 1 of the present invention, the casing has an opening having a diameter larger than the outer diameter of the centrifugal blower blade on the lower surface, and an orifice that is detachably joined to the opening to form a suction port; A suction port outer peripheral wall extending downward from the outer peripheral end of the orifice; a lower surface portion extending outward from a lower end portion of the suction port outer peripheral wall; and a shape of the outer peripheral portion being substantially the same as the inner peripheral surface of the frame; An orifice unit formed integrally with an outer peripheral wall extending upward from an outer peripheral end of the lower surface portion, and having a recess opened upward from the outer peripheral wall of the suction port, the lower surface portion, and the outer peripheral wall, is provided on the lower surface of the frame. The orifice unit that is detachably provided in the casing in the lower space in the frame without using a tool and removed for attaching and detaching the blades has an outer peripheral shape that is the same as the inner peripheral surface of the frame. Roughly the same Therefore, the mounting direction can be easily discriminated, and the orifice is made detachable from the casing, so that even if a small amount of wind leaks from the joint between the casing and the orifice due to the pressure generated during blowing, it moves to the recess side. The flow and noise generated at that time have the effect of hardly propagating to the indoor side.

  The ceiling-embedded ventilation fan according to claim 2, wherein the outer peripheral end of the lower surface portion of the orifice unit extends to the inner peripheral surface of the frame, and extends upward along the inner peripheral surface of the frame. A wall is formed and a cavity including a recess formed in the orifice unit is formed in the frame. The orifice unit has an outer peripheral wall along the inner peripheral surface of the frame, so that the mounting direction is easier. The mounting state is stabilized by the outer peripheral wall along the inner peripheral surface of the frame, and the noise generated when a small amount of wind leaks from the joint between the casing and the orifice Resonance is silenced at, and the propagation to the indoor side becomes smaller.

  The ceiling-embedded ventilation fan according to claim 3 is provided with a slit at the lower end portion of the outer peripheral wall of the suction port of the orifice unit that allows communication between the suction port side and the inside of the concave portion, and is generated by blowing of the centrifugal blower blade Then, the noise radiated from the orifice suction port is propagated into the concave portion and resonance is silenced in the cavity.

  The ceiling-embedded ventilation fan according to claim 4 is provided with an inclination toward the slit on the lower surface portion so that the slit is positioned at the lowest position of the lower surface portion. The generated water droplet is guided to the slit by the inclination and is discharged out of the orifice unit.

  The ceiling-embedded ventilation fan according to claim 5 is a ceiling-embedded ventilation fan in which an air inlet for sucking air from another room is provided on a side wall of the frame, and an outer peripheral side is provided on a lower surface portion of the orifice unit. It is provided with an inclined surface that becomes higher, and can widen an air passage for intake air from another room through the intake port, and can smoothly guide the flow of the intake air flow to the intake port of the orifice.

  In the ceiling-embedded ventilation fan according to claim 6, the outer peripheral portion of the lower surface portion of the orifice unit is formed with a step, and the rigidity of the orifice unit can be increased without increasing the material used.

  Further, the ceiling-embedded ventilation fan according to claim 7 is provided with a first locking piece on one side of the orifice unit and a second locking piece on the side facing the one side, A first engagement portion and a second engagement portion that engage with the first locking piece and the second locking piece at positions corresponding to the first locking piece and the second locking piece of the casing. An engaging portion is provided, and the first locking piece has a hook shape. When the second locking piece is removed when the orifice unit is removed, the other first locking piece becomes the first locking piece. 1 is hooked to the engaging portion to be suspended, and the orifice is held in the casing.

  In the ceiling-embedded ventilation fan according to claim 8, the first locking piece has a U-shape, the second locking piece is removed, and the first locking piece is caught. The holding power in the state increases.

  The ceiling-embedded ventilation fan according to claim 9 is a ceiling-embedded type in which a grill that covers the lower surface opening of the frame from below is removably attached to a mounting portion provided inside the frame by a mounting spring provided on the grill. In the ventilation fan, the grill is attached in the vicinity of the first locking piece and the second locking piece, and the first engagement portion or the second engagement portion of the casing and the attachment of the grill The part can be provided integrally.

  The ceiling-embedded ventilation fan according to claim 10 is characterized in that the second locking piece is a locking piece that elastically deforms, a finger hooking portion is provided at a position facing the second locking piece in the vicinity of the second locking piece, 2 and the finger-holding portion are pinched with fingers, and the operation is performed by pinching the second locking piece and the finger-holding portion with a finger of one hand. Can be canceled.

  In the ceiling-embedded ventilation fan according to claim 11, the second locking piece and the finger-hanging portion are arranged in a direction parallel to the inner wall surface of the frame, and in a limited space within the main body frame. Further, it is possible to provide the second locking piece that is elastically deformed with a larger stroke while maximizing the cavity of the orifice.

  The ceiling-embedded ventilation fan according to claim 12 is configured to elastically deform the finger-hanging portion, and can elastically deform the second locking piece with a large stroke while elastically deforming the finger-hanging portion. It becomes.

  The ceiling-embedded ventilation fan according to claim 13 is provided with a plurality of pairs of first locking pieces and first engaging portions that engage with the first locking pieces, and the plurality of pairs are different. The first locking piece or the first engaging portion in the pair has a different size, and when the orifice unit is installed, it will be engaged even if the orifice unit is mistakenly installed upside down. Since the magnitude | size of the 1st locking piece and 1st engaging part which do not respond | correspond does not attach.

  The ceiling-embedded ventilation fan according to claim 14 is provided with a plurality of pairs of first locking pieces and first engaging portions that engage with the first locking pieces. The pitch from the center of each main body in the one locking piece or the plurality of first engaging portions is different, and when the orifice unit is attached, even if the orifice unit is mistakenly installed upside down, The pitch from the center of the main body of the first engaging piece to be engaged and the first engaging portion is different and cannot be attached.

  In addition, the ceiling-embedded ventilation fan according to claim 15 is provided with a marking of the order and method of removing the orifice unit on the lower surface of the orifice unit. When cleaning, the orifice unit Know how to put on and take off.

  In the ceiling-embedded ventilation fan according to claim 16, the orifice unit and the casing have different colors, and when removing the orifice unit integrated with the casing, the casing and the orifice unit are separate parts. Can be determined.

  In the ceiling-embedded ventilation fan according to claim 17, the casing has a dark color and the orifice unit has a lighter color than the casing. When the orifice unit integrated with the casing is removed, the ceiling unit has a dark color. With respect to the formed casing, the orifice unit formed in a bright color is conspicuous due to the illusion of contraction color and expansion color.

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

(Embodiment 1)
As shown in FIGS. 1 and 2, the ceiling-embedded ventilation fan of Embodiment 1 is attached to the back of the ceiling, has an adapter 2 connected to the duct 1 communicating with the outside on the side surface, and an opening 3 a facing the indoor side on the lower surface. A box-like frame 3 having an inner wall, and a scroll-like casing 4 provided inside the frame 3 and having a suction port 8 on the lower surface and a discharge port (not shown) communicating with the adapter 2 on the side surface; A centrifugal blower blade 5 that is disposed inside the casing 4 and blows air for discharging indoor air to the outside through the duct 1, and an electric motor 6 that rotationally drives the centrifugal blower blade 5. Is provided with a casing opening 7 having a diameter larger than the outer diameter of the centrifugal blowing blade 5 on the lower surface, and an orifice 9 having a suction port 8 having a diameter smaller than the outer diameter of the centrifugal blowing blade 5 formed on the lower surface of the casing opening 7. Orif It is provided with a scan unit 10 detachably.

  As shown in FIG. 2, the orifice unit 10 includes a suction port outer peripheral wall 11 extending downward from the outer peripheral end of the orifice 9, and extending outward from a lower end portion of the suction port outer peripheral wall 11. The lower surface portion 12 having substantially the same shape as the inner peripheral surface of the frame 3 and the outer peripheral wall 13 extending upward from the outer peripheral end of the lower surface portion 12 are integrally formed, and the suction port outer peripheral wall 11, the lower surface portion 12, and the outer peripheral wall 13 are formed. And a concave portion 14 that opens upward.

  In addition, a slit 15 is provided at the lower end of the suction port outer peripheral wall 11 so that the suction port 8 side communicates with the inside of the recess 14, and the lower surface 12 is configured by an inclination toward the slit 15 so that the slit 15 is at the lowest position. In addition, a step 28 is provided on the outer peripheral portion corresponding to the position where the inclination is the highest so that the recess 14 is recessed one more stage.

  As shown in FIG. 3, a first latch comprising U-shaped latching pieces 16 </ b> A and 16 </ b> B, which are two hooks having different latching widths, are formed on one side of the orifice unit 10. A second locking piece 17 comprising two locking pieces 17A, 17B which are provided with a piece 16 and elastically deformed so that it can be pinched with fingers on the side facing the first locking piece 16. Are arranged at intervals of 50 mm to 100 mm in a direction parallel to the inner wall surface of the frame 3, and are engaged with the first locking piece 16 at a position corresponding to the first locking piece 16 of the casing 4. One engaging portion 18 (consisting of engaging portions 18A and 18B) and a second engaging portion 19 (engagement) that engages the second locking piece 17 at a position corresponding to the second locking piece 17. 4), the first locking of the orifice unit 10 as shown in FIG. 16 is hooked on the first engagement portion 18 of the casing 4, the orifice unit 10 is pressed upward to push the second locking piece 17 into the second engagement portion 19, and the orifice unit 10 is moved to the casing 4. It is configured to be attached to.

  Further, as shown in FIGS. 5 and 6, the attachment spring 21 provided on the grill 20 that covers the opening 3 a on the lower surface of the frame 3 from below is provided inside the frame 3 with the first engagement portion 18 of the casing 4. The grill 20 is attached to the frame 3 by being locked to attachment portions 22, 22 provided in the vicinity of the second engagement portion 19.

  Then, the casing 4 is formed in a dark color, and the orifice unit 10 is formed in a lighter color than the casing 4, and the orifice unit 10 is removed in the vicinity of the second locking piece 17 on the lower surface thereof as shown in FIG. A stamp 23 indicating the order and method is provided.

  In the above configuration, when cleaning the indoor dust attached to the centrifugal blower blades 5 for a long time operation, as shown in FIG. 7, the two locking pieces 17A of the second locking piece 17 of the orifice unit 10 are used. , 17B, apply the force with the index finger to the other, and pinch with the finger of one hand, both of the locking pieces 17A and 17B are placed at the center As a result of the elastic deformation, the engaged claw 24 is disengaged from the second engaging portion 19 of the casing 4 and the orifice unit 10 can be pulled down, as shown in FIGS. The first locking piece 16 of the orifice unit 10 is held by the casing 4 while being suspended from the first engaging portion 18 of the casing 4 by a U-shape, so that the orifice unit 10 can be removed with one hand. The Even if the orifice unit 10 is lifted upward, the engagement between the first locking piece 16 and the first engaging portion 18 is easily released, so that the orifice unit 10 is provided at a high position on the ceiling. In the space of the dark and narrow frame 3, the orifice unit 10 can be removed from the casing 4 with one hand without using a tool, and the centrifugal blower blade 5 can be taken out from the lower surface of the casing 4 by removing the orifice unit 10. A casing opening 7 can be formed.

  As shown in FIGS. 1 and 7, since the second locking piece 17 is arranged in a direction parallel to the inner wall surface of the frame 3, the space with the orifice 9 provided in the central portion of the orifice unit 10. In addition, since the second locking piece 17 can be elastically deformed with a large stroke, the allowance between the claw 24 and the second engaging portion 19 is larger. Even if it becomes a thing, the engagement can be cancelled | released with little force, and easy detachability will be acquired, ensuring reliable attachment property. Further, since the second locking pieces 17 can be provided at an appropriate interval, when removing the orifice unit 10, it is easy to apply a force because the orifice unit 10 is supported by one hand, and the removal work can be performed safely without difficulty. It will be.

  In addition, the inside of the frame 3 that is opened when the grill 20 is removed during cleaning is very narrow and dark, but the orifice unit 10 that is integrally attached to the casing 4 is against the casing 4 that is formed in a dark color. Since it is formed in a bright color, the orifice unit 10 becomes conspicuous due to the illusion of contraction color and expansion color, and it can be easily determined at a glance that the orifice unit 10 is a separable component. Further, according to the display of the marking 23 provided in the vicinity of the second locking piece 17 of the orifice unit 10, the operation can be performed reliably by performing the operation in accordance with the order and the method.

  When the orifice unit 10 is attached to the casing 4, the shape of the outer peripheral wall 13 of the orifice unit 10 is substantially the same as the inner peripheral surface of the frame 3 as shown in FIGS. By attaching the attachment portion 22 for attaching the first engagement portion 18 and the second engagement portion 19 close to each other and assembling the attachment structure portion in one direction, the attachment direction can be easily determined. When the first locking piece 16 is hooked on the first engaging portion 18 and the orifice unit 10 is pushed upward with respect to the casing opening 7 on the lower surface of the casing 4, as shown in FIG. The orifice unit 10 is not inclined by the provided first engagement piece 16, and the second engagement piece 17 of the orifice unit 10 is invited to the position of the second engagement portion 19 of the casing 4. As shown in FIG. 7, the second locking piece 17 is pushed into the second engaging portion 19 while being elastically deformed, and the second locking piece 17 is moved to the second engaging portion. The orifice unit 10 can be easily attached to the casing 4 by engaging with 19 while generating a clicking sound. Moreover, the attachment structure part is integrally formed by bringing the attachment part 22 for attaching the grille 20, the first engagement part 18 and the second engagement part 19 close to each other and bringing together the attachment structure part in one direction. It is also possible.

  Further, when the orifice unit 10 is attached to the casing 4, the first locking piece 16 and the second locking piece 17 provided at two positions substantially opposite to the side surface of the casing 4, and the first locking piece The first engaging portion 18 that engages 16 and the second engaging portion 19 that engages the second locking piece 17 are dropped or suspended when one of the engagements is incomplete. In this state, the orifice unit 10 cannot be attached to the casing 4, and both the locking pieces 16, 17 and the engaging portions 18, 19 are securely engaged, whereby the orifice unit 10 and the casing 4 are It will be completely fixed.

  Further, as shown in FIGS. 9 and 10, when the orientation of the orifice unit 10 is not the normal direction, the first locking piece 16 of the orifice unit 10 is hooked on the first engaging portion 18 of the casing 4. Since the locking pieces 16A and 16B are formed with different widths, the locking pieces 16A and 16B can be hooked on the engaging portions 18A and 18B of the first engaging portion 18 of the casing 4 formed to have a width corresponding to these widths. The orifice unit 10 cannot be attached and fixed to the casing 4.

  Further, during the operation of the ceiling-embedded ventilation fan, wind leakage occurs if there is a gap between the orifice unit 10 and the casing 4 due to the static pressure generated by the rotating air blowing of the centrifugal air blowing blade 5, as shown in FIG. In addition, since the three-sided superposed joint portion 27 is formed by the first step portion 25 and the second step portion 26, there is almost no air leakage at the joint portion 27 between the casing 4 and the orifice unit 10. The noise generated due to a small amount of wind leakage is discharged to the concave portion 14 formed of the suction port outer peripheral wall 11, the lower surface portion 12 and the outer peripheral wall 13 of the orifice unit 10. The noise generated by the rotation of the centrifugal fan 5 and radiated from the suction port 8 of the orifice 9 is the suction port outer peripheral wall 11. The slit 15 provided at the lower end is propagated to the inside of the recess 14, and be resonance silencer inside the recess 14.

  In addition, water droplets generated by condensation or the like inside the recess 14 flow toward the slit 15 due to the inclination of the lower surface portion 12 and are discharged out of the recess 14.

  Further, as shown in FIG. 2, by providing a step 28 on the outer peripheral portion of the lower surface portion 12 of the orifice unit 10, the orifice unit 10 can be reinforced by ribs or the like, and the amount of material used is more than necessary. Therefore, high rigidity can be obtained without increasing the thickness, and the shape can be stabilized even when the orifice unit 10 is kept light, and safe detachability and reliable attachment can be obtained.

  As described above, according to the ceiling-embedded ventilation fan according to the first embodiment of the present invention, the orifice unit 10 is formed without using a tool in a narrow space inside the frame 3 attached at a high position called the back of the ceiling. The centrifugal blower blade 5 can be removed from the casing opening 7 to be cleaned and the orifice unit 10 can be attached to and detached from the opening 7 by pinching the second locking piece 17 with a finger of one hand without using a tool. At this time, the U-shape of the other first locking piece 16 is hooked on the first engaging portion 18 of the casing 4 so that the orifice unit 10 is suspended. Therefore, the orifice unit 10 does not fall even if the operation is mistaken, and it is possible to provide a ceiling-embedded ventilation fan that has excellent decomposability, improved cleanability, and safety. Kill.

  Also, when the orifice unit 10 is attached, the first engagement of the casing 4 to which the first locking piece 16 is hooked is made by matching the direction of the shape of the outer peripheral wall 13 of the orifice unit 10 and the shape of the frame 3. Since the position of the joint portion 18 can be discriminated at a glance, the orifice unit 10 can be easily attached to the casing 4, and a ceiling-embedded ventilation fan that is excellent in assembling property and improved in cleaning property can be provided.

  In addition, since the second locking piece 17 is arranged in a direction parallel to the inner wall surface of the frame 3, a large stroke can be secured and elastically deformed. In addition, when the orifice unit 10 is attached / detached, it is possible to easily attach / detach the orifice unit 10 with an unreasonable force, and it is possible to provide a ceiling-embedded ventilation fan excellent in attaching / detaching operability and safety in a fixed state.

  The configuration in which the second locking pieces 17 are arranged at intervals of 50 to 100 mm in the direction parallel to the inner wall surface of the frame 3 is such that when the orifice unit 10 is removed, the orifice unit 10 is large and heavy. Can be stably operated and held with one hand, and can be operated with the fingers of one hand.

  Further, it is possible to determine at a glance that the orifice unit 10 and the casing 4 are separable components, and it is possible to understand the procedure for removing the orifice unit 10 from the casing 4 without checking an instruction manual or the like. Therefore, the centrifugal blower blade 5 can be cleaned without causing the user to get lost.

  In addition, it prevents the orifice unit 10 from being installed in the wrong direction or attached in an incomplete state even after installation after cleaning. Click when the orifice unit 10 is attached in a normal state. Since it is possible to confirm with the ear that the orifice unit 10 is securely fixed to the casing 4 by sound, the user is lost or used in an incorrect state even after the cleaning operation. The ventilation operation can be resumed normally.

  Further, even if the orifice unit 10 is detachable from the casing 4, it is possible to eliminate the air leakage generated from the gap of the joint portion 27 by the three-sided superposition bonding, and to maintain the blowing performance. The noise generated is released into the recess 14 and can be sound-insulated, and the blowing noise radiated from the suction port 8 of the orifice 9 is resonated by the recess 14 and the slit 15 and can be further reduced in noise. It is possible to provide a ceiling-embedded ventilation fan that has almost no noise, excellent disassembly and assembly, and improved cleanability.

  Further, it is possible to prevent moisture from being accumulated in the recess 14 due to water droplets generated in the recess 14 due to dew condensation or the like, and it is possible to suppress the occurrence of mold and the propagation of germs in and around the recess 14.

  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 27, the effect of the further wind leak prevention can be acquired.

  The first locking piece 16 is not limited to the U-shape, but is a hook shape such as an L-shape or U-shape, and the shape in which the orifice unit 10 is held in a suspended state. If so, there is no difference in the effects.

  In the first embodiment, the number of places where the first locking piece 16 and the first engaging portion 18 are provided is two. However, the present invention is not limited to this, and may be a plurality of places. Needless to say.

  The first locking pieces 16 are two (a plurality of) locking pieces 16A and 16B having different widths. However, the present invention is not limited to this, and the pitch from the center of the plurality of main bodies is different. There is no difference in the effects.

(Embodiment 2)
As shown in FIG. 12, the embedded ceiling type ventilation fan of the second embodiment has an orifice unit 10A, which is a component separate from the casing 4A, as compared with the embedded ceiling type ventilation fan of the first embodiment. A cavity including a recess 14A formed in the orifice unit 10A, with the outer peripheral end of 12A extending to the inner peripheral surface of the frame 3 and extending upward along the inner peripheral surface of the frame 3 to form an outer peripheral wall 13A. 29 is formed inside the frame 3.

  With the above configuration, when the orifice unit 10A is attached to the casing 4A, the mounting direction can be more easily determined by placing the outer peripheral wall 13A along the inner peripheral surface of the frame 3, and the fixed state can also be determined within the inner wall of the outer peripheral wall 13A and the frame 3. Since the peripheral surface is in contact, the orifice unit 10A does not tilt, and noise generated when a small amount of wind leaks from the joint 27A between the casing 4A and the orifice 9A is separated from the indoor side. Resonance noise is generated in the formed cavity 29, and propagation to the indoor side becomes smaller.

  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.

The perspective view which shows the ceiling embedded type ventilation fan of Embodiment 1 of this invention Sectional view showing the ceiling-mounted ventilation fan The perspective view which shows the attachment or detachment state of the centrifugal ventilation blade in the ceiling embedded ventilation fan The perspective view which shows the attachment or detachment condition of the orifice unit in the ceiling embedded ventilation fan The exploded perspective view which shows the grille installation state in the ceiling embedded ventilation fan Front view of the ceiling-mounted ventilation fan when the grill is removed Sectional drawing which shows the engagement state of the 2nd latching piece of the ceiling embedded type ventilation fan The enlarged view which shows the engagement state of the 1st latching piece of the ceiling embedded ventilation fan Perspective view showing incorrect installation status of orifice unit of ceiling embedded ventilation fan Detail drawing of the main part showing the wrong installation status of the orifice unit Sectional view showing the joint between the casing and orifice unit of the ceiling-embedded ventilation fan Sectional drawing which shows the ceiling embedded type ventilation fan of Embodiment 2 of this invention Sectional view showing a conventional ceiling-mounted ventilation fan Perspective view showing another conventional ventilation device

DESCRIPTION OF SYMBOLS 3 Frame 4 Casing 5 Centrifugal blower blade 6 Electric motor 7 Casing opening 8 Suction port 9 Orifice 10 Orifice unit 10A Orifice unit 11 Suction port outer peripheral wall 12 Lower surface part 12A Lower surface part 13 Outer peripheral wall 13A Outer wall 14 Recessed part 15 Slit 16 First locking Piece 17 Second Locking Piece 18 First Engagement Part 19 Second Engagement Part 20 Grill 21 Attachment Spring 22 Attachment Part 23 Marking 28 Step 29 Cavity

Claims (17)

A box-shaped frame that is inserted and attached to the back of the ceiling and has an opening facing the indoor side on the lower surface; a scroll-shaped casing having a suction port on the lower surface and a discharge port on the side surface in the frame; A centrifugal blower blade disposed in the casing; and an electric motor that rotationally drives the centrifugal blower blade. An orifice that is freely joined to form the suction port, an outer peripheral wall of the suction port that extends downward from an outer peripheral end of the orifice, and extends outward from a lower end portion of the outer peripheral wall of the suction port. A lower surface portion having substantially the same shape as the inner peripheral surface of the frame and an outer peripheral wall extending upward from the outer peripheral end of the lower surface portion are integrally formed, and opened upward from the suction port outer peripheral wall, the lower surface portion, and the outer peripheral wall. With a concave Isuyunitto a ceiling type ventilating fan, wherein removably provided that the casing without the use of tools in the space below in the frame lower surface of the from the opening frame. The outer peripheral end of the lower surface portion of the orifice unit extends to the inner peripheral surface of the frame, extends upward along the inner peripheral surface of the frame to form an outer peripheral wall, and a recess formed in the orifice unit. The ceiling-embedded ventilation fan according to claim 1, wherein a cavity including the cavity is formed in the frame. The ceiling-embedded ventilation fan according to claim 1 or 2, wherein a slit is provided at a lower end portion of the outer peripheral wall of the suction port of the orifice unit so as to communicate the suction port side with the inside of the recess. The ceiling-embedded ventilation fan according to claim 3, wherein an inclination toward the slit is provided on the lower surface portion so that the slit is positioned at the lowest position of the lower surface portion. 5. The ceiling-embedded ventilation fan in which an air inlet for sucking air from other chambers is provided on a side wall of the frame, and an inclined surface having a higher outer peripheral side is provided on a lower surface portion of the orifice unit. The ceiling-embedded ventilation fan described in Crab. The ceiling-embedded ventilation fan according to claim 1 or 2, wherein the outer peripheral portion of the lower surface portion of the orifice unit is formed with a step. A first locking piece is provided on one side of the orifice unit, and a second locking piece is provided on the side facing the one side, respectively, and the first locking piece and the second engagement of the casing are provided. A first engagement portion and a second engagement portion that engage with the first locking piece and the second locking piece are provided at a position corresponding to the stopping piece, and the first locking piece is The ceiling-embedded ventilation fan according to claim 1 or 2, wherein the fan is hook-shaped. The ceiling-embedded ventilation fan according to claim 7, wherein the first locking piece has a U-shape. In the ceiling-embedded ventilation fan, a grill that covers the lower surface opening of the frame from below is detachably attached to a mounting portion provided inside the frame by a mounting spring provided in the grill, and the grill is fixed to the first lock The ceiling-embedded ventilation fan according to claim 7 or 8, wherein the ceiling-mounted ventilation fan is configured to be attached in the vicinity of the piece and the second locking piece. The second locking piece is an elastically deformable locking piece, a finger hooking portion is provided at a position facing the second locking piece in the vicinity thereof, and the second locking piece and the finger hooking portion are sandwiched between fingers. The ceiling-embedded ventilation fan according to any one of claims 7 to 9, which is configured to be pinched. The ceiling-embedded ventilation fan according to claim 10, wherein the second locking piece and the finger-hanging portion are arranged in a direction parallel to the inner wall surface of the frame. The ceiling-embedded ventilation fan according to claim 10 or 11, wherein the finger-hanging portion is configured to elastically deform. A plurality of pairs of first locking pieces and first engaging portions that engage with the first locking pieces are provided, and the first locking pieces in the different pairs or the first locking pieces. The ceiling-embedded ventilation fan according to claim 7, wherein the engaging portions have different sizes. A plurality of pairs of first locking pieces and first engaging portions that engage with the first locking pieces are provided, and the plurality of first locking pieces or the plurality of first engagements are provided. The ceiling-embedded ventilation fan according to any one of claims 7 to 12, wherein a pitch from each center of the main body at the joint is different. The ceiling-embedded ventilation fan according to any one of claims 7 to 12, wherein a marking of the order and method of removing the orifice unit is provided on a lower surface of the orifice unit. The ceiling-embedded ventilation fan according to any one of claims 1 to 15, wherein the orifice unit and the casing have different colors. The ceiling-embedded ventilation fan according to claim 16, wherein the casing has a dark color and the orifice unit has a lighter color than the casing.

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