JP7113370B2 - Ceiling-mounted ventilation fan - Google Patents

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a ceiling-embedded ventilator that is embedded in an opening provided in a ceiling and connected to a duct that communicates with the outdoors and that is installed behind the ceiling.

Conventionally, this type of ceiling-embedded ventilation fan is known to have an orifice attached detachably (for example, Patent Document 1).

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

The conventional ceiling-embedded ventilation fan shown in FIG. a scroll-shaped casing 106 having a discharge port 105 on its side surface; a centrifugal blower blade 107 provided in the casing 106;

The casing 106 has an opening 109 with a larger diameter than the centrifugal blower blade 107 on its lower surface. An orifice 111 having a suction port 110 is provided in the opening 109, and the orifice 111 is detachably provided from the opening 102 on the lower surface of the frame to the space 112 below the casing 106 in the frame without using tools. is.

JP 2009-180445 A

Such a conventional ceiling-embedded ventilation fan takes in air by the fan and at the same time, takes in dust and the like floating in the air. In addition, after long-term use, the dust or the like that has been taken in adheres to the air passages and the parts arranged in the air passages, resulting in a decrease in air blowing performance.

Therefore, the orifice is easily removable from the scroll casing, and the centrifugal fan is easily removable from the fan motor. As a result, the user can maintain the blowing performance by removing and cleaning the orifice and the centrifugal blower fan.

However, since the orifice is a detachable part, there is a minute gap between the orifice and the scroll casing, that is, at the joint. Since the joint is substantially opposed to the blowing direction of the centrifugal blower, the joint becomes high pressure. For this reason, dust and the like are likely to enter the joint portion, which is a very small gap. Furthermore, as shown in Fig. 14, dust that passes through minute gaps expands into visible lumps and falls into the living room due to its own weight during long-term use. .

In addition, in order to clean the dust accumulated on the scroll casing side at the joint between the scroll casing and the orifice, it is necessary to clean the scroll casing after removing the orifice and the fan, which is very time-consuming. there were.

A ceiling-embedded ventilation fan according to the present invention comprises a main body frame having a lower surface with an air inlet and a side surface with an air outlet. and a scroll casing. Inside the scroll casing, there are a centrifugal fan that is rotated to guide air from the suction port to the exhaust port, an electric motor that rotates the centrifugal fan via a rotating shaft, and an orifice that is detachably attached to the scroll casing. It has The partition includes a partition-side joint surface around the suction opening that is joined to the orifice on a plane perpendicular to the rotation axis, and the orifice is joined to the partition-side joint surface on a plane perpendicular to the rotation axis. An orifice-side joint surface is provided, and the partition-side joint surface and the orifice-side joint surface are provided with a concave-convex structure that engages with each other, and the concave-convex structure protrudes annularly toward the orifice side from the partition-side joint surface. an inner peripheral annular protrusion projecting toward the partition wall side on the inner peripheral side of the central annular protrusion on the orifice side joint surface; and the partition wall on the outer peripheral side of the central annular protrusion. an outer peripheral annular protrusion that protrudes toward the side, the outer peripheral annular protrusion is joined to the partition wall side joint surface, and the height of the inner peripheral annular protrusion from the orifice side joint surface is It is lower than the height of the outer circumferential annular projection from the orifice side joint surface, and has a structure in which a gap is provided between the projecting tip of the inner circumferential annular projection and the partition wall side joint surface.

As a result, when the orifice is attached to the scroll casing, a bag-like space is formed by fitting the concave-convex structures to each other. deposits to Accumulated dust or the like can be removed by removing the orifice and washing it away with water or the like.

To provide a ceiling-embedded ventilator capable of accumulating dust or the like accumulated during long-term use on an orifice side and easily cleaning and removing the orifice by removing the orifice.

Cross-sectional view of the ceiling-embedded ventilation fan according to the present invention FIG. 1 is a perspective view from below of a ceiling-embedded ventilation fan according to the present invention; FIG. 2 is a perspective view of an orifice viewed from below according to the present invention; 1 is a perspective view of a scroll casing viewed from below according to the present invention; FIG. 1 is a top perspective view of an orifice according to the present invention; FIG. 1 is a perspective view of a scroll casing viewed from above according to the present invention; FIG. FIG. 4 is a view showing the orifice according to the present invention before it is attached to the scroll casing; FIG. 4 is a view showing the orifice according to the present invention after being attached to the scroll casing; A cross-sectional view showing an annular space where dust and the like accumulate according to the present invention. FIG. 4 is a diagram showing an orifice and a projection for fitting the scroll casing according to the present invention; FIG. 4 is a diagram showing a state in which the fitting protrusion of the orifice according to the present invention has gotten over the fitting protrusion of the scroll casing; FIG. 4 is a diagram showing a case where the relationship between the orifice and the joint surface of the scroll casing according to the present invention is reversed. Cross-sectional view of a conventional ceiling-mounted ventilation fan Cross-sectional view showing the path of dust falling in a conventional ceiling-mounted ventilation fan

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings for understanding of the present invention. It should be noted that the following embodiment is an example that embodies the present invention, and does not limit the technical scope of the present invention. In addition, throughout the drawings, the same parts are denoted by the same reference numerals, and the second and subsequent explanations are omitted.

(Embodiment)
First, a schematic configuration of a ceiling-mounted ventilation fan 1 according to the present invention will be described with reference to FIGS. 1 and 2. FIG.

A ceiling-embedded ventilation fan 1 is provided with an adapter 3 attached to the ceiling and connected to a side wall of a duct 2 communicating with the outside, and a box-shaped main body frame 5 having a suction port 4 facing the indoor side on the bottom surface. there is The adapter 3 functions as an exhaust port in the ceiling-embedded ventilation fan 1 . The ceiling-mounted ventilation fan 1 includes a scroll casing 7 having a partition wall 30 with an intake opening 10 on the side of the intake port 4 inside the body frame 5, that is, on the bottom surface, and an outlet port 6 communicating with the adapter 3 on the side surface. I have.

The scroll casing 7 blows indoor air to the outside through the adapter 3 and the duct 2, that is, the centrifugal fan 8 that guides the air from the suction port 4 to the exhaust port, and the centrifugal fan 8 that rotates. and an electric motor 9 for The electric motor 9 has a blade fastening component 24 at the tip of the rotating shaft 23 for fixing the centrifugal fan 8 to the rotating shaft 23 . By grasping the tip portion of the blade fastening component 24 shown in the lower part of FIG. can be removed.

The suction opening 10 provided in the partition 30 has a diameter larger than the outer diameter of the centrifugal fan 8 . Furthermore, an orifice 12 is provided on the underside of the suction opening 10 .

The orifice 12 has a substantially cylindrical shape with a circular suction opening 11 having a diameter smaller than the outer diameter of the centrifugal fan 8, as shown in FIG. The orifice 12 has a plurality of arcuate orifice-side joint surfaces 13 detachably joined to the scroll casing 7 at its downstream end.

The orifice-side joint surface 13 has a shape in which a plurality of four arc-shaped parts are connected in the circumferential direction, and is a plane perpendicular to the rotation shaft 23 and having a hollow circular shape. However, strictly speaking, the orifice-side joint surface 13 is not horizontal over the entire circumference.

That is, as shown in FIGS. 3 and 4, the orifice 12 has four notches 31 evenly spaced between the orifice-side joint surfaces 13 . The notch 31 is provided with a stepped portion 33 projecting from the orifice-side joint surface 13 toward the scroll casing 7 so as to cover the notch 31 . That is, when the orifice-side joint surface 13 is viewed from the downstream side, the notch 31 is covered with the stepped portion 33 . Further, the lower surface side (upstream side) of the stepped portion 33 , that is, the surface of the stepped portion 33 on the cutout portion 31 side constitutes a stepped joint surface 14 that is joined to the scroll casing 7 . As shown in enlarged view B of FIG. 3 and enlarged view C of FIG. A protrusion is provided.

An inner circumferential annular protrusion 21 that is an inner protrusion is positioned on the inner end surface of the orifice-side joint surface 13 .

An outer peripheral annular protrusion 22 that is an outer protrusion is positioned on the outer end surface of the orifice-side joint surface 13 .

The inner circumferential annular protrusion 21 and the outer circumferential annular protrusion 22 form an annular recessed partition wall shape 17 on the orifice-side joint surface 13 .

As shown in FIG. 5, the scroll casing 7 is provided with a plurality of arc-shaped partition wall lower joint surfaces 16 (constituting the partition wall side joint surface) that are joined to the orifice side joint surface 13 on the orifice 12 side.

The partition lower joint surface 16 is a plane perpendicular to the rotating shaft 23 and having a hollow circular shape, and is provided around the suction opening 10 . The partition lower joint surface 16 is provided with a central annular projection 18 annularly projecting toward the orifice 12 at substantially the center in the radial direction. The height of the central annular protrusion 18 from the partition wall lower joint surface 16 is lower than the height of the annular partition wall concave shape 17 from the orifice side joint surface 13 . Furthermore, the height of the central annular protrusion 18 from the partition lower joint surface 16 is lower than the height of the inner circumferential annular protrusion 21 from the orifice side joint surface 13 .

As shown in FIG. 6, in the outer peripheral portion of the suction opening 10 of the scroll casing 7, there is a space projecting outward from the center of the opening at a position corresponding to the step joint surface 14, that is, a substantially convex opening. 15 and four partition wall upper joint surfaces 32 to be joined to the step joint surface 14 on the orifice side.

When the scroll casing 7 and the orifice 12 are centered, the central annular protrusion 18 is positioned between the inner peripheral annular protrusion 21 and the outer peripheral annular protrusion 22 of the orifice. In this state, when the central annular protrusion 18, the inner peripheral annular protrusion 21, and the outer peripheral annular protrusion 22 are brought into contact with each other, the partition wall lower joint surface 16 and the orifice-side joint surface 13 are provided with a concave-convex structure that fits together.

The orifice 12 is attached to the scroll casing 7 by pushing up the orifice 12 from below the scroll casing 7 while aligning the stepped joint surface 14 of the orifice with the convex opening 15 of the scroll casing as shown in FIG. After being pushed up in the direction of arrow X, the orifice 12 is rotated clockwise, i.e., rotated in the direction of arrow Y in FIG. , orifice 12 is fixed to scroll casing 7 .

When the orifice 12 is fixed to the scroll casing 7, the annular partition wall concave shape 17 and the central annular protrusion 18 are fitted, and the outer peripheral annular protrusion 22 and the partition wall lower joint surface 16 are joined. That is, a central annular protrusion 18 annularly protruding from the partition wall 30 toward the orifice side, an inner peripheral annular protrusion 21 on the inner peripheral side of the central annular protrusion 18 on the orifice side joint surface 13, and an outer peripheral annular protrusion 21 on the outer peripheral side of the central annular protrusion 18 on the orifice side joint surface 13. By fitting with the protrusion 22, a closed annular bag-like space 19 is formed at the tip of the central annular protrusion 18 as shown in FIG.

Furthermore, in order to ensure that the orifice 12 is held in the scroll casing 7, a holding structure other than the engagement of the annular concave-convex structure is provided. As shown in FIG. 10, a projection 20a for fitting is provided on the outer peripheral side of the stepped portion 33 of the orifice, and a fitting protrusion 20a is provided on the inner peripheral side of the partition wall upper joint surface 32 of the scroll casing. A fitting projection 20b is provided. A circular arc shape 34a is provided at the outer peripheral tip of the fitting projection 20a. Similarly, an arc shape 34b is provided at the tip of the inner periphery of the fitting projection 20b.

When the orifice 12 is fixed to the scroll casing 7, when the orifice 12 is rotated clockwise when viewed from the living room side from the disengaged state of FIG. The shape 34a contacts the circular arc shape 34b at the tip of the projection for fitting. When a further rotational force is applied, the orifice 12 is deformed inward and the arcuate shapes 34a and 34b come into contact with each other, so that the fitting protrusion 20a overcomes the fitting protrusion 20b to reach the engaged state shown in FIG. . That is, when the fitting projection 20a gets over the fitting projection 20b, a click feeling is generated, and the user can recognize that the orifice 12 is securely attached to the scroll casing 7. FIG. Also, if a counterclockwise rotational force is applied to the orifice 12 as viewed from the living room side due to the vibration caused by the rotation of the electric motor 9, the transition to the disengaged state is caused by the friction between the fitting protrusions 20a and 20b. For restraint, the orifice 12 is prevented from falling out of the scroll casing 7 .

By the way, due to the long-term operation of the electric motor 9 and the centrifugal fan 8, dust and the like contained in the room air accumulate in the air passage. Particularly, as shown in FIG. 9 , the arc-shaped joint surface between the scroll casing 7 and the orifice 12 has a gap in the engaging structure that is substantially opposed to the blowing direction of the centrifugal fan 8 . Due to the generated pressure, the pressure becomes high, and dust and the like tend to accumulate in the gap between the two.

According to the above configuration, dust and the like that have passed through the gap are trapped in the annular bag-like space 19 formed by the annular partition wall concave shape 17 of the orifice side joint surface 13 and the central annular protrusion 18 on the scroll casing partition wall side. Dust and the like accumulate on the orifice side due to their own weight.

At the time of cleaning, the orifice 12 is rotated counterclockwise to be pulled out downward and removed from the scroll casing 7, so that accumulated dust and the like can be easily removed. The height of the inner peripheral annular projection 21 of the annular partition wall concave shape 17 of the orifice is slightly lower than that of the outer peripheral annular projection 22. By providing a difference in height, the annular bag-like space 19 collects more dust and the like. Easy structure.

Further, as shown in FIG. 12, a central annular protrusion 18 is provided on the orifice side joint surface 13, an inner peripheral annular protrusion 21 and an outer peripheral annular protrusion 22 are provided on the partition wall lower joint surface 16 of the scroll casing, and an annular partition wall recess is provided. By providing the shape 17, an annular bag-like space 19 is formed. With such a configuration, dust and the like accumulate on the orifice side due to their own weight, so it is possible to obtain the same effect.

INDUSTRIAL APPLICABILITY The present invention is effective as a ceiling-embedded ventilation fan that can easily remove dust that has accumulated due to long-time operation.

1 Ceiling Embedded Ventilation Fan 2 Duct 3 Adapter 4, 104, 110 Suction Port 5, 103 Body Frame 6 Blowout Port 7 Scroll Casing 8 Centrifugal Fan 9, 108 Electric Motor 10 Suction Opening 11 Circular Suction Opening 12, 111 Orifice 13 Orifice Side Joint Surface 14 Step joint surface 15 Convex opening 16 Partition lower joint surface 17 Annular partition wall concave shape 18 Central annular projection 19 Bag-like space 20a Fitting projection 20b Fitting projection 21 Inner circumferential annular projection 22 Outer circumferential annular projection 23 Rotating shaft 24 Blade fastening component 30 Partition wall 31 Notch 32 Partition wall upper joint surface 33 Stepped portion 34a Circular arc shape 34b Circular arc shape

Claims (4)

a body frame having a bottom surface with an air inlet and side surfaces with an air outlet;
a scroll casing that is housed in the body frame and has a partition wall with a suction opening on the suction port side and a blowout opening on the exhaust port side;
a centrifugal fan that guides air from the suction port to the exhaust port by being rotationally driven within the scroll casing;
an electric motor that rotationally drives the centrifugal fan via a rotating shaft;
and an orifice provided in the partition so as to be detachable from the partition in the direction of the suction port, the partition comprising:
A partition side joint surface that joins the orifice on a plane perpendicular to the rotation axis around the suction opening,
The orifice is
an orifice-side joint surface that joins with the partition-side joint surface on a plane perpendicular to the rotation axis;
The partition-side joint surface and the orifice-side joint surface are provided with a concave-convex structure that fits into each other ,
The uneven structure is
On the partition side joint surface,
a central annular protrusion that annularly protrudes toward the orifice;
On the orifice side joint surface,
an inner peripheral annular protrusion projecting toward the partition wall side on the inner peripheral side of the central annular protrusion;
an outer peripheral annular protrusion projecting toward the partition wall side on the outer peripheral side of the central annular protrusion,
The outer peripheral annular protrusion is joined to the partition wall side joining surface,
the height of the inner circumferential annular projection from the orifice-side joint surface is lower than the height of the outer circumferential annular projection from the orifice-side joint surface,
A ceiling-embedded ventilating fan having a gap between the projecting tip of the inner circumferential annular projection and the joint surface on the partition wall side . a body frame having a bottom surface with an air inlet and side surfaces with an air outlet;
a scroll casing that is housed in the body frame and has a partition wall with a suction opening on the suction port side and a blowout opening on the exhaust port side;
a centrifugal fan that guides air from the suction port to the exhaust port by being rotationally driven within the scroll casing;
an electric motor that rotationally drives the centrifugal fan via a rotating shaft;
and an orifice provided in the partition so as to be detachable from the partition in the direction of the suction port, the partition comprising:
A partition side joint surface that joins the orifice on a plane perpendicular to the rotation axis around the suction opening,
The orifice is
an orifice-side joint surface that joins with the partition-side joint surface on a plane perpendicular to the rotation axis;
The partition-side joint surface and the orifice-side joint surface are provided with an uneven structure that fits into each other ,
The uneven structure is
On the partition side joint surface,
a central annular protrusion that annularly protrudes toward the orifice;
on the orifice side joint surface,
an inner peripheral annular protrusion projecting toward the partition wall side on the inner peripheral side of the central annular protrusion;
an outer peripheral annular protrusion projecting toward the partition wall side on the outer peripheral side of the central annular protrusion,
The outer peripheral annular protrusion is joined to the partition wall side joining surface,
The height of the central annular protrusion from the joint surface on the partition wall side is lower than the height of the inner circumferential annular protrusion from the joint surface on the orifice side . a body frame having a bottom surface with an air inlet and side surfaces with an air outlet;
a scroll casing that is housed in the body frame and has a partition wall with a suction opening on the suction port side and a blowout opening on the exhaust port side;
a centrifugal fan that guides air from the suction port to the exhaust port by being rotationally driven within the scroll casing;
an electric motor that rotationally drives the centrifugal fan via a rotating shaft;
and an orifice provided in the partition so as to be detachable from the partition in the direction of the suction port, the partition comprising:
A partition side joint surface that joins the orifice on a plane perpendicular to the rotation axis around the suction opening,
The orifice is
an orifice-side joint surface that joins with the partition-side joint surface on a plane perpendicular to the rotation axis;
The partition-side joint surface and the orifice-side joint surface are provided with an uneven structure that fits into each other ,
The uneven structure is
on the orifice side joint surface,
a central annular protrusion that annularly protrudes toward the partition wall;
On the partition side joint surface,
an inner circumferential annular projection projecting toward the orifice on the inner circumferential side of the central annular projection;
an outer peripheral annular protrusion projecting toward the orifice side on the outer peripheral side of the central annular protrusion,
The outer peripheral annular protrusion is joined to the orifice side joint surface,
The height of the inner circumferential annular projection from the partition wall side joint surface is lower than the height of the outer circumferential annular projection from the partition wall side joint surface,
A ceiling-embedded ventilating fan having a gap between the projecting tip of the inner circumferential annular projection and the orifice-side joint surface . a body frame having a bottom surface with an air inlet and side surfaces with an air outlet;
a scroll casing that is housed in the body frame and has a partition wall with a suction opening on the suction port side and a blowout opening on the exhaust port side;
a centrifugal fan that guides air from the suction port to the exhaust port by being rotationally driven within the scroll casing;
an electric motor that rotationally drives the centrifugal fan via a rotating shaft;
and an orifice provided in the partition so as to be detachable from the partition in the direction of the suction port, the partition comprising:
A partition side joint surface that joins the orifice on a plane perpendicular to the rotation axis around the suction opening,
The orifice is
an orifice-side joint surface that joins with the partition-side joint surface on a plane perpendicular to the rotation axis;
The partition-side joint surface and the orifice-side joint surface are provided with an uneven structure that fits into each other ,
The uneven structure is
on the orifice side joint surface,
a central annular protrusion that annularly protrudes toward the partition wall;
On the partition side joint surface,
an inner circumferential annular projection projecting toward the orifice on the inner circumferential side of the central annular projection;
an outer peripheral annular protrusion projecting toward the orifice side on the outer peripheral side of the central annular protrusion,
The outer peripheral annular protrusion is joined to the orifice side joint surface,
The height of the central annular protrusion from the joint surface on the orifice side is lower than the height of the inner peripheral annular protrusion from the joint surface on the partition wall side .

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