JP2005127585A - Duct cover, ventilator and air conditioner - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a duct cover free from the lowering of a flow rate even when a ventilation duct of a large diameter is mounted, by providing a small-diameter part of the duct cover with the air permeability in the direction in parallel with an axis of the duct cover, and to provide a ventilator composed of the ventilation duct and the duct cover, and an air conditioner comprising the ventilator. <P>SOLUTION: The small-diameter part and a large-diameter part are formed on an inner peripheral face of the duct cover 1, and the small-diameter part is composed of a plurality of (four in this case) ridge parts in parallel with the axis of the duct cover 1 and a plurality of trough parts 12 held among the ridge parts 3. As the small-diameter part is constituted by the ridge parts 3 and the trough parts 12, the air exhausted from the ventilation duct 5 can flow through the trough parts 12 between the ridge parts 3, even in such a state that a tip of the ventilation duct 5 is kept into contact with stepped parts 3a of the ridge parts, an area of a flow channel at the small-diameter part can be widened, and the duct cover 1 free from a problem on the lowering of the exhaust flow rate, can be provided. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a duct cover that is crowned on a side end portion on the outdoor side of a ventilation duct and is closed with a perforated closing plate, and in particular, on the inner peripheral surface of the duct cover, A duct cover having a structure having a small diameter part capable of attaching a large diameter part and a large diameter part capable of attaching a large diameter duct, wherein the small diameter part is provided with air permeability in a direction parallel to the axial center of the duct cover, The present invention relates to a ventilation device including the duct cover, and an air conditioner including the ventilation device.

In general, a duct cover protects a ventilation duct at the end of a pipe that guides the exhausted air from the room to the outside, for example, in an exhaust device that exhausts indoor air to the outside or an air conditioner such as an air conditioner. It is attached for the purpose.
As a conventional technique in this duct cover, for example, as shown in FIGS. 13 and 14, there is a duct cover 101 that is attached to a side end portion on the outdoor side of the ventilation duct. As can be seen from the figure, the air discharge port 102 of the duct cover 101 is closed in a ventilation manner by a lattice-shaped perforated blocking plate.
The diameter of the duct cover 101 has two stages, and is structured to be shared by both the small-diameter ventilation duct 105 (FIG. 13) and the large-diameter ventilation duct 106 (FIG. 14) having different diameters. That is, out of the ventilation ducts 105 and 106 having two large and small diameters, the ventilation duct 105 having a small diameter can be inserted into the small diameter portion 103 of the duct cover on the air outlet 102 side (see FIG. 13). Further, the ventilation duct 106 having a large diameter has a structure that can be inserted only into the large diameter portion 104 of the duct cover on the ventilation duct insertion port 107 side (FIG. 14).

Further, as another prior art in the duct cover, there is a duct cover that covers and protects a bent portion such as an electric wire and a refrigerant pipe in an air conditioner as disclosed in Patent Document 1. In addition, the duct cover has a connection that can be shared by two types of refrigerant pipes with different diameters at the boundary between the large diameter part and the small diameter part of the duct cover. Is used by cutting the connecting portion described above, and when connecting a small-diameter refrigerant pipe, the connecting portion described above may be used as it is without being cut.
Here, there is a type of duct cover particularly used for a ventilator, in which the duct cover is inserted into the ventilation duct and attached. For example, duct covers as shown in Patent Document 2 and Patent Document 3 correspond to this.
Japanese Patent Laid-Open No. 10-82498 JP 2000-356376 A JP 2003-65575 A

However, in the case of the conventional duct cover 101 shown in FIGS. 13 and 14 described above, when the duct cover 101 is used to cover the end of the large-diameter ventilation duct 106 as shown in FIG. Due to the difference in cross-sectional area between the diameters of the portion 103 and the large diameter portion 104, the passage of the air discharged from the ventilation duct 106 to the outside suddenly becomes narrow at the boundary between the large diameter portion 104 and the small diameter portion 103. As a result, there is a high possibility that the flow rate of air discharged through the ventilation duct 106 to the outside will be reduced.
Further, in the technique disclosed in Patent Document 1, when connecting a large-diameter refrigerant pipe, work such as cutting or breaking the above-described connection portion is required, which is troublesome. In addition, for example, if the connection part fails to be cut, the duct cover that has failed to be cut cannot be used, so it is necessary to procure a new duct cover and there is a problem concerning the economy.
Further, in the techniques disclosed in Patent Document 2 and Patent Document 3, the cross-sectional area of the air discharge port must be smaller than the cross-sectional area of the ventilation duct due to the configuration in which the duct cover is inserted and attached to the ventilation duct. For this reason, there is a possibility that the flow rate of air exhausted to the outside will be reduced. In addition, since the duct cover is attached by being inserted into the ventilation duct, the duct cover may not be able to handle depending on the shape or diameter of the ventilation duct.

Therefore, the present invention has been made in view of the above circumstances, and the object of the present invention is to be crowned at the side end of the ventilation duct outside the room, and to be provided with a perforated closing plate at the crowned end. In the duct cover, in particular, a duct cover that does not cause a decrease in flow rate even when a large-diameter ventilation duct is installed by making the small diameter portion of the duct cover have air permeability in a direction parallel to the axis of the duct cover. Another object of the present invention is to provide a ventilator comprising the ventilation duct and the duct cover, and an air conditioner equipped with the ventilator.
This eliminates the disadvantages caused by the above-described conventional duct cover, and also makes it possible to share the duct cover with a plurality of types of ventilation ducts and to suppress a decrease in the air flow rate. That is, when the indoor air discharged to the outside is led to the outdoor end of the duct cover through the ventilation duct, the cross-sectional area of the air discharge port and the cross-sectional area of the duct cover indoor side end change greatly. Therefore, there is no resistance to the air flow inside the duct cover, and the effect of increasing the air flow efficiency can be obtained, and the exhaust flow rate can be prevented from decreasing. In addition, a stepped portion is provided on the inner peripheral surface of the duct cover to connect the small-diameter portion to which the small-diameter duct is attached and the large-diameter portion to which the large-diameter duct is attached. It can be used for both a ventilation duct having a diameter and a ventilation duct having a diameter in contact with the stepped portion.

In order to achieve the above object, the present invention provides an air exhaust port provided at an outdoor side end portion and a hollow attached to the side end portion on the outdoor side of a ventilation duct that guides exhausted air from the room to the outside. A duct cover having a crowned end closed in a ventilation manner by a perforated obstruction plate, provided on the inner peripheral surface of the duct cover on the back side where the perforated obstruction plate is provided. A small-diameter portion that can be fitted with a small-diameter duct and a large-diameter portion that is provided on the entrance side and can be fitted with a large-diameter duct, and the small-diameter portion has air permeability in a direction parallel to the axis of the duct cover. It is comprised as a duct cover characterized by comprising a structure.
Further, as an example of the duct cover, it is conceivable that the shape of the duct cover is a substantially hollow cylindrical shape.

In this case, it is desirable that the air-permeable structure is composed of a ridge portion parallel to the axial center of the duct cover and a valley portion parallel to the ridge portion.
In addition, about the said ridge part, it is possible to further provide the ventilation hole in the inside. Further, the structure having air permeability may be constituted by a concentric cylinder formed inside the duct cover when the shape of the duct cover is a substantially hollow cylindrical shape. Furthermore, it is preferable that the stepped portion tip connecting the large diameter portion and the small diameter portion is chamfered.

  Here, the duct cover may be provided with a saddle member through which the ventilation duct passes in order to fix a portion of the ventilation duct that protrudes from the duct cover to a portion on the entrance side of the duct cover. .

  Moreover, the case where the said perforated obstruction board is attached to the said crown end part of the said duct cover so that opening and closing is possible is also considered. In this case, it is desirable that the perforated blocking plate is attached to the crowned end portion of the duct cover so as to be freely opened and closed via a connecting member. The perforated blocking plate may further include a biasing member that constantly elastically biases the perforated blocking plate in a direction in which the crowned end portion of the duct cover is closed.

  In the duct cover according to the present invention, an air discharge port is provided at the outdoor end, and a ventilation duct for guiding the exhausted air from the room to the outside, and a crown at the outdoor side end of the ventilation duct. You may use for the ventilation apparatus comprised from the hollow-shaped duct cover with which it wears, or the air conditioner provided with this ventilation apparatus.

As described above, the duct cover according to the present invention is provided on the inner peripheral surface of the duct cover on the back side where the perforated blocking plate is provided, and on the entrance side with a small diameter portion on which the small diameter duct can be attached. A large-diameter portion on which a large-diameter duct can be mounted, and the small-diameter portion has air permeability in a direction parallel to the axis of the duct cover.
As a result, when the indoor air discharged to the outside is guided to the outdoor end of the duct cover through the ventilation duct, the cross-sectional area of the air discharge port and the indoor side end of the duct cover Since the cross-sectional area is substantially the same area, there is no resistance to the air flow inside the duct cover, so the effect of increasing the air flow rate can be obtained.
Further, the flange member is provided at the entrance side portion of the duct cover, so that the ventilation duct is fixed by the flange member when a ventilation duct having a diameter corresponding to the small diameter portion is inserted into the duct cover. This makes it possible to stabilize the installation state.

  Further, since the tip of the stepped portion is chamfered, when the ventilation duct is inserted into the small diameter portion of the duct cover, the ventilation duct is not easily caught at the tip of the stepped portion, and the duct is easily The ventilation duct can be inserted into the cover, improving workability.

Here, in the present invention, when the perforated blocking plate is attached to the crowned end portion of the duct cover so as to be freely opened and closed, for example, when the exhaust flow rate from the ventilation duct increases, By opening the plate with the wind pressure of the exhausted air, the effect of performing more exhaust can be obtained.
Further, the perforated blocking plate is biased by the biasing member in a direction in which the crowned end portion of the duct cover is closed, so that the perforated blocking plate can be installed even when the duct cover is installed downward. The board does not open under its own weight. As a result, there is no problem such as dust and insects entering the duct cover, and the conditions regarding the installation location of the ventilator and the air conditioner equipped with the duct cover will be eased.

Hereinafter, embodiments and examples of the present invention will be described with reference to the accompanying drawings so that the present invention can be understood. It should be noted that the following embodiments and examples are examples embodying the present invention, and do not limit the technical scope of the present invention.
FIG. 1 is a perspective view when a duct cover 1 according to an embodiment of the present invention (hereinafter referred to as the present embodiment) is attached to a ventilation duct 4 having a small diameter, and FIG. 2 is the embodiment. FIG. 3 is a cross-sectional view of the duct cover 1 according to the present embodiment, and FIG. 4 is a perspective view of the duct cover 1 according to the present embodiment. FIG. 5 is a cross-sectional view of a duct cover 1 that can be shared with ventilation ducts of various diameters, and FIG. 5 is a lattice-shaped perforated blockage that closes the air outlet at the tip of the duct cover 1 according to this embodiment in a ventilated manner FIG. 6 is a perspective view when the lid 8 is attached to the insertion port 2a of the duct cover 1 according to this embodiment, and FIG. 7 is a view showing the ridge portion 9 in the duct cover 1 according to this embodiment. Duct cover when a hollow portion 10 parallel to the axis of the duct cover 1 is provided inside. FIG. 8 is a front view of the duct cover 1 according to the present embodiment, and FIG. 8 shows the duct cover 1 when the duct cover 1 is provided with a concentric cylinder 13 coaxial with the duct cover 1. FIG. 9 is a front view when viewed from the side 2a, FIG. 9 is a perspective view when the perforated closing plate 2 is closed in the duct cover 1 according to this embodiment, and FIG. 10 is a duct cover 1 according to this embodiment. FIG. 11 is a perspective view when a rubber 22 that always elastically biases the perforated obstruction plate 2 is provided on the duct cover 1 according to this embodiment. FIG. 12 is a view showing an example of a ventilation device provided in the air conditioner provided with the duct cover 1 according to this embodiment.

First, the basic configuration of the duct cover 1 according to the present embodiment will be described with reference to FIGS. 1 and 2 are perspective views when the duct cover 1 is attached to the ventilation ducts 4 and 5 having two types of diameters. 3 and 4 are cross-sectional views of the duct cover 1, and FIG. 5 is a front view of the lattice-shaped perforated blocking plate 2 that closes the air discharge port at the tip of the duct cover 1 in a ventilation manner. Here, in the present embodiment, as an example of the duct cover having a hollow shape, the case of the duct cover 1 having a generally hollow cylindrical shape is described. The present invention can be applied without being limited to this, such as a hollow D-shaped cylindrical shape having a substantially D-shaped cross section.
The duct cover 1 according to the present embodiment is composed of a resin member such as plastic, a metal member, or the like. As can be seen from the above-described drawings, the shape of the duct cover 1 is a substantially hollow cylindrical shape (FIGS. 1 and 2). As a result, the duct cover has a stronger structure than that of a square cover. An air discharge port is provided at the outdoor end of the duct cover 1, and the air discharge port is closed in a ventilation manner by a lattice-shaped perforated blocking plate 2. Here, the porous shape of the perforated blocking plate 2 mentioned in this embodiment is a lattice shape (FIG. 5). However, the porous shape is not limited to this, for example, a circular shape. It goes without saying that there is no problem even if the shape is a closed curve such as a polygonal shape such as a hexagonal shape. Thus, by making the porous shape of the perforated blocking plate 2 into the shape as described above, it is possible to prevent intrusion of dust and insects.

On the inner peripheral surface of the duct cover 1 as described above, on the back side where the perforated blocking plate 2 is provided, a small diameter portion on which the small diameter duct 4 can be mounted, and a large diameter duct 5 provided on the entrance side can be mounted. The point where the large diameter portion is formed is the same as that of the conventional duct cover 101 shown in FIG. 14, but the feature point in this embodiment is that the small diameter portion is parallel to the axial center of the duct cover 1. This is a point constituted by a plurality of (in this case, four) ridges 3 and a plurality of valleys 12 sandwiched between the ridges 3. Since the ridge portion 3 is formed in the small diameter portion as described above, when the small diameter ventilation duct 4 is inserted into the duct cover 1 until it contacts the perforated obstruction plate 2, the tip of the ventilation duct 4 is As shown in FIG. 1, the four ridges 3 mentioned above are brought into contact with each other, and the ridges 3 are fixed to the duct cover 1 on the inner peripheral surface.
When the large-diameter ventilation duct 5 is inserted into the duct cover 1, the tip of the ventilation duct 5 comes into contact with the stepped portion 3a on the insertion port 2a side of the ridge portion 3, as shown in FIG. The stepped portion 3a serves as a stopper, and the ventilation duct 5 is not inserted further into the back of the duct cover 1 than the stepped portion 3a of the ridge portion 3. Further, the ventilation duct 5 is fixed to the large diameter portion by closely fitting the ventilation duct 5 to the inner peripheral surface of the large diameter portion of the duct cover 1. At this time, since the plurality of valleys 12 are formed in the small diameter portion, as can be seen from FIG. 2, the ventilation duct 5 can be used even when the tip of the ventilation duct 5 is in contact with the stepped portion 3a of the ridge. 5 can flow through the valley portion 12 between the ridge portion 3 and the ridge portion 3, so that the air flow in the small diameter portion can be compared with the conventional duct cover 101 shown in FIG. The area of the road is large and the duct cover 1 does not cause the disadvantage of reducing the exhaust flow rate.
The duct cover 1 shown in FIGS. 1 and 2 has a one-stage structure with one large-diameter portion and one small-diameter portion, but in the present invention, the number of the stepped portions is not limited to one. For example, FIG. 4 shows the case of a two-stage structure. In this case, a plurality of heights of the ridge portion 7 formed on the inner peripheral surface of the duct cover 1 are formed on the ridge portion 7 so as to increase stepwise as it is closer to the perforated blocking plate 2 as shown in FIG. By providing step heights (for example, Z = 2 mm, Y = 4 mm), the duct cover 1 can be shared with three types of ventilation ducts having different diameters. In this case, the stepped portion 7a in which the height of the ridge portion 7 is changed to a tapered chamfered shape as shown in FIG. The ventilation duct is easier to insert than the shape.
In the above description, the case of two stages (FIGS. 1, 2 and 3) and the case of three stages (FIG. 4) have been described, but the number of stages can be arbitrarily set. Moreover, although the four ridge parts 3 are provided in the inside of the duct cover 1 which concerns on this embodiment, about the number of ridge parts, it is not limited to this, Any number may be sufficient.

When a ventilation duct having a small outer diameter is attached to the duct cover 1 as shown in FIG. 1, 2, 3 or 4, for example, as can be easily understood from FIG. A gap 6 is generated between the ventilation duct 4 and the duct cover 1, and play is generated between the ventilation duct 4 and the duct cover 1. Such play allows the duct to vibrate and causes insects to enter.
FIG. 6 is a perspective view showing that the lid 8 (an example of the eaves member) is attached to the insertion port 2a side of the duct cover 1, but by attaching the lid 8 in this way, Invasion of insects and the like can be prevented. The lid 8 also has a function of fixing the ventilation duct and preventing the vibration of the duct when the ventilation duct (for example, the ventilation duct 4) fixed by the ridge portion described above is inserted into the duct cover 1. ing. Furthermore, the lid 8 is made of a stretchable material such as rubber, so that the holes of the lid 8 can be deformed according to the diameter of the ventilation duct, and can be used for various ventilation ducts smaller than the diameter of the duct cover 1. It is desirable to be able to share.
The lid 8 can be attached to the end of the duct cover 1 on the side of the insertion port 2a with, for example, a screw or an adhesive.

In the embodiment described above, the ridge portion 3 and the valley portion 12 parallel to the ridge portion 3 have been described as an example of a structure having air permeability in a direction parallel to the axis of the duct cover. About the structure provided with air permeability in the parallel direction, it is not limited to the said ridge part and trough part 12, For example, what was shown in FIG.7 and FIG.8 is mentioned.
FIG. 7 is a front view of the duct cover 1 when the ridge portion 9 is provided with a hollow portion 10 parallel to the axial center of the duct cover 1 when viewed from the insertion port 2a side. The shape of the ridge portion 9 provided on the inner peripheral surface of the duct cover 1 is hollow, and the hollow hole 10 provided in the ridge portion 9 is provided with the above-described perforated blocking plate 2 having an air discharge port. It penetrates to. With such a structure, when a large-diameter ventilation duct (for example, the ventilation duct 5) is inserted into the duct cover 1, the air exhausted from the ventilation duct passes through the hollow hole 10 and passes through the perforated blocking plate 2. It is structured to be discharged from the outlet. For this reason, the area where the ridge portion 9 is not hollow, that is, the ridge portion 9 does not have the hollow hole 10, the area for discharging air is increased, and the air flow rate is also increased. In addition, about the shape of the ridge part 9 mentioned above, it is not limited to the shape shown by FIG.
For example, a shape as shown in FIG. 8 is conceivable as another example of the structure having air permeability in a direction parallel to the axis of the duct cover. In this case, a concentric cylinder 13 coaxial with the duct cover 1 is formed inside the duct cover 1, and passes through a space 11 between the concentric cylinder 13 and the outer duct cover 1, and then from a large-diameter ventilation duct. Ventilation flows out. In addition, it is desirable to strengthen structurally by forming the ridge part 9 in the space 11. Further, it goes without saying that the ridge portion 9 and the duct cover 1 may be integrally formed as shown in FIG. 8, or may be formed separately.

About the perforated obstruction | occlusion board 2 with which the duct cover 1 demonstrated above was provided in the crowned end part of the duct cover 1 so that it may understand also from FIGS. 1-4, FIG. The perforated blocking plate 2 according to the present invention can be attached to the crowned portion of the duct cover 1 so as to be freely opened and closed as shown in FIGS.
Hereinafter, the case where the perforated blocking plate 2 is attached to the crowned portion of the duct cover 1 so as to be freely opened and closed will be described with reference to FIGS. 9, 10, and 11. 9 is a perspective view of the duct cover 1 according to this embodiment when the perforated closing plate 2 is closed. FIG. 10 is a perspective view of the duct cover 1 according to this embodiment. FIG. 11 is a perspective view when the duct cover 1 according to this embodiment is provided with a rubber 22 that always elastically urges the perforated blocking plate 2. Here, the internal configuration of the duct cover 1 is the same as the above-described configuration, and is omitted here.
As shown in FIGS. 9 and 10, the hollow cylindrical portion 20 of the duct cover 1 and the perforated blocking plate 2 are connected by a connecting member 21 such as a hinge, for example. As a result, the perforated obstruction plate 2 is closed by the dead weight of the perforated obstruction plate 2 when, for example, the air is not ventilated or the exhaust flow rate from the ventilation duct is small. 2, the end of the duct cover 1 is closed (FIG. 9). In this case, it is desirable that the hollow cylindrical portion 20 of the duct cover 1 and the perforated blocking plate 2 are in close contact with each other, but there is no problem even if there is a gap that does not allow insects or the like to enter.
Further, it is desirable that the weight of the perforated blocking plate 2 is adjusted so that it opens as shown in FIG. 10 by the wind pressure of the exhaust gas when the exhaust gas flow rate from the ventilation duct increases, for example. In other words, the perforated closing plate 2 is configured to open larger as the exhaust flow rate from the ventilation duct increases. As a result, the larger the exhaust flow rate from the ventilation duct, the larger the opening area of the perforated blocking plate 2 and the higher the exhaust air flow rate. In this case, since the wind pressure of the exhaust is high, it is possible to prevent insects and the like from entering the duct cover 1 or the ventilation duct.
The connecting member 21 in this embodiment may be a hinge as described above, but the connecting member 21, the hollow cylindrical portion 20 of the duct cover 1, and the perforated portion like a cap provided in a commercially available shampoo or the like. There is no problem even if the closing plate 2 is integrally molded.

FIG. 11 is a view in which the perforated blocking plate 2 and the hollow cylindrical portion 20 of the duct cover 1 are connected by rubber 22 (an example of an urging member in the present invention). With this configuration, even when the duct cover 1 is attached with the perforated closing plate 2 facing downward, the perforated closing plate 2 is maintained closed by the tension of the rubber 22. Invasion of insects can be prevented. In this case, it is desirable that the tension of the rubber 22 is adjusted so that the perforated closing plate 2 opens more as the exhaust flow rate from the ventilation duct increases. As a result, the larger the flow rate of air exhausted from the ventilation duct, the larger the opening area of the perforated blocking plate 2 and the higher the exhaust circulation efficiency.
Although rubber is used as an example of the urging member in the present invention, there is no problem even if it is a spring member such as a leaf spring, a coil spring, or a helical spring.

About the duct cover 1 demonstrated as one Embodiment in this invention, it is applicable also to the air conditioner provided with the ventilator comprised from the ventilation duct and the duct cover, or the ventilator. Hereinafter, the example which mounts the ventilation apparatus V which attached the duct cover 1 which concerns on this embodiment on the ventilation duct 5 in an air conditioner using FIG. 12 is demonstrated. Here, the case where the above-described ventilation duct 5 is adopted as the ventilation duct constituting the ventilation device V is described as an example, but the ventilation duct 4 having a diameter smaller than that of the ventilation duct 5 is adopted. Even in this case, the present invention can be applied. The air conditioner provided with the ventilation device V is, of course, composed of an indoor unit (not shown) and an outdoor unit (not shown). In FIG. 12, the air conditioner is installed outdoors on the outdoor unit side. The ventilating device V and the surrounding configuration are illustrated.
As shown in FIG. 12, the ventilation device V includes a duct cover 1 and a ventilation duct 5, and a refrigerant that connects an indoor unit (not shown) and an outdoor unit (not shown) around the ventilation device V. A drain hose 33 for guiding drain water discharged from the pipes 31 and 32 and the indoor unit (not shown) is disposed. In addition, the refrigerant pipe 31, the refrigerant pipe 32, and the drain hose 33 are connected to an indoor unit (not shown) through a wall hole 30 provided in the wall surface of the house. Here, regarding the ventilation duct used, when the diameter of the wall hole 30 is small due to the combination of the refrigerant pipe 31, the refrigerant pipe 32 and the drain hose 33 that pass through the wall hole 30, the diameter of the ventilation duct 4 is, for example, A thin one is good.

  In addition, about the structure of the ventilation ducts 4 and 5 mentioned above, it is not limited to the resin-made bellows hoses quoted in this embodiment, Rubber etc. may be sufficient and hoses other than a bellows hose may be used. Needless to say. Also, the lid 8 is not limited to a stretchable material such as rubber, but may be made of resin or metal. By doing so, it looks better than when rubber is used. Moreover, it is not a problem if the gap on the insertion port 2a side is closed with a tape such as a vinyl tape instead of using the lid 8.

The perspective view at the time of making the duct cover 1 which concerns on one Embodiment of this invention crown the ventilation duct 4 with a small diameter. The perspective view at the time of making the duct cover 1 which concerns on one Embodiment of this invention crown the ventilation duct 5 with a large diameter. 1 is a cross-sectional view of a duct cover 1 according to an embodiment of the present invention. The cross-sectional view of the duct cover 1 which can be shared with respect to the ventilation duct of three types of diameter which concerns on one Embodiment of this invention. The front view of the perforated obstruction board 2 of the grid | lattice shape which closes the air exhaust port of the front-end | tip of the duct cover 1 which concerns on one Embodiment of this invention by ventilation. The perspective view at the time of attaching the cover 8 to the insertion port 2a of the duct cover 1 which concerns on one Embodiment of this invention. Front view when duct cover 1 is viewed from insertion port 2a side when ridge portion 9 in duct cover 1 according to an embodiment of the present invention has hollow portion 10 parallel to the axis of duct cover 1 therein. Figure It is a front view at the time of seeing the duct cover 1 at the time of providing the concentric cylinder 13 coaxial with the duct cover 1 in the duct cover 1 which concerns on one Embodiment of this invention from the insertion port 2a side. The perspective view in case the perforated obstruction board 2 is closed in the duct cover 1 which concerns on one Embodiment of this invention. The perspective view at the time of the perforated obstruction board 2 being opened in the duct cover 1 which concerns on one Embodiment of this invention. The perspective view at the time of the rubber | gum 22 always energizing the perforated obstruction | occlusion board 2 provided in the duct cover 1 which concerns on one Embodiment of this invention. The figure which showed an example of the ventilation apparatus with which the air conditioner was provided with the duct cover 1 which concerns on one Embodiment of this invention. The figure which attached the duct cover 101 concerning a prior art to the ventilation duct 105 which has a thin diameter. The figure which attached the duct cover 101 which concerns on a prior art to the ventilation duct 106 which has a thick diameter.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... Duct cover 2 ... Perforated obstruction board 2a ... Insert 3, 7, 9 ... Ridge part 3a, 7a ... Step part 4 ... Ventilation duct (small diameter)
5 ... Ventilation duct (large diameter)
6 ... gap 8 ... lid 10 ... hollow hole 11 ... space 12 ... valley 13 ... concentric cylinder 20 ... hollow cylindrical part 21 of the duct cover 1 ... connecting member 22 ... rubber 101 ... duct cover (conventional)
102 ... Air discharge port 103 ... Small diameter portion of the duct cover (conventional)
104 ... Large diameter part of duct cover (conventional)
105, 106 ... ventilation duct 107 ... ventilation duct outlet

Claims (12)

A hollow duct cover that is attached to an outer side end of a ventilation duct that is provided with an air discharge port at an outdoor side end and guides exhausted air from the room to the outdoor side. In a duct cover that is closed in a ventilation manner by a perforated closing plate,
On the inner peripheral surface of the duct cover, a small-diameter portion provided on the back side where the perforated blocking plate is provided and capable of attaching a small-diameter duct, and a large-diameter portion provided on the entrance side and capable of attaching a large-diameter duct. The duct cover is characterized in that the small-diameter portion has a structure having air permeability in a direction parallel to the axial center of the duct cover.   The duct cover according to claim 1, wherein the air-permeable structure includes a ridge portion parallel to the axial center of the duct cover and a valley portion parallel to the ridge portion.   The duct cover according to claim 2, wherein the ridge portion further includes a vent hole inside thereof.   The duct cover according to claim 1, wherein the duct cover has a substantially hollow cylindrical shape.   The duct cover according to claim 4, wherein the air-permeable structure is constituted by a concentric cylinder formed inside the duct cover.   The duct cover according to claim 1, wherein a tip of a stepped portion connecting the large diameter portion and the small diameter portion is chamfered.   The duct cover according to any one of claims 1 to 6, further comprising a flange member through which the ventilation duct passes to fix a portion of the ventilation duct that protrudes from the duct cover to a portion on the entrance side of the duct cover.   The duct cover according to claim 1, wherein the perforated blocking plate is attached to the crowned end portion of the duct cover so as to be freely opened and closed.   The duct cover according to claim 8, wherein the perforated blocking plate is attached to the crowned end portion of the duct cover so as to be freely opened and closed via a connecting member.   The duct cover according to claim 8, further comprising a biasing member that constantly elastically biases the perforated blocking plate in a direction in which the crowned end portion of the duct cover is closed.   An air exhaust port is provided at the outdoor end and a ventilation duct that guides the exhausted air from the room to the outside of the room, and a hollow duct cover that is attached to the side end of the ventilation duct outside the room. The ventilator by which the said duct cover is a duct cover of Claims 1-10.   An air conditioner comprising the ventilation device according to claim 11.

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