JP2003180556A - Airblow nozzle and hand drier - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To reduce noise from an airblow nozzle without increasing air volume. <P>SOLUTION: To reduce noise from the airblow nozzle 3 without increasing the air volume, the airblow nozzle 3 has a nozzle hole 5 for collecting air flow generated from an air supply means to jet air flow at a high speed. The nozzle hole 5 has a protrusion 6 on its inner surface. A groove 22 is provided on the inner surface of the nozzle hole 5. A non-woven fabric 23 is provided on the inner surface of the nozzle hole 5. <P>COPYRIGHT: (C)2003,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a blowing nozzle installed in a hand dryer for washing hands in a washroom or a toilet and drying wet hands.

[0002]

2. Description of the Related Art Conventionally, for example, Japanese Patent Application Laid-Open No. 2000-15744 discloses a blowing nozzle used in a hand dryer.
The one shown in Japanese Patent Publication No. 8 is known. FIG. 26 is a cross-sectional view showing a conventional hand dryer shown in Japanese Patent Laid-Open No. 2000-157448, FIG. 27 is a perspective view showing a blowing nozzle installed in the hand dryer shown in FIG. 26, and FIG. It is sectional drawing of the hole provided in the blowing nozzle shown in 27. 26 to 28, 1001 is a hand dryer,
Reference numeral 1002 is a blower that serves as a blower, and 1003 is a blow nozzle. 1004 represents the flow of the air flow, and 1005
Is a nozzle hole.

Next, a series of operations of each part will be described. As shown in FIG. 26, the hand dryer 1001 is provided with a blower 1002, which serves as an air blower installed therein.
Air is sucked from the lower part of the hand dryer 1001 and high-pressure air is discharged to the blowing nozzle 1003. The blowing nozzle 1003 is a rapid reduction nozzle, and the nozzle hole 1
A high-speed airflow is sent from 005. Hand dryer 100
1 is to dry the wet hand in a relatively short time by blowing off the water on the wet hand surface in front of the nozzle hole 1005 with a high-speed air stream from the blowing nozzle 1003 and drying it.

The velocity of the air flow inside the blow hole is about 100 m / s.
Because of the high speed, noise mainly composed of turbulent noise is generated from the inside of the nozzle hole 1005, and the noise of the hand dryer 1001 becomes extremely high. Therefore, as shown in FIG.
The nozzle holes 1005 were arranged in two stages, and measures were taken to reduce the noise by reflecting and interfering with the turbulent flow noise generated inside. Further, in order to prevent turbulent flow noise, the nozzle hole 1005 has a smooth inner surface as shown in FIG. 28, and is configured to prevent turbulent flow.

[0005]

However, in the conventional hand dryer as described above, the blowing nozzle 100 is used.
When the number of the nozzle holes 1005 of No. 3 is increased, the amount of air discharged from the blower 1002 increases, and the vibration and noise of the blower 1002 itself increase. As a result, even if the noise of the blowing nozzle 1003 itself is reduced, the noise from the blower 1002 is increased, and thus the noise of the hand dryer 1001 itself is not lowered.

Therefore, the present invention has been made to solve the above problems, and provides a blowing nozzle and a hand dryer which can reduce noise from the nozzle without increasing the amount of blowing air. The purpose is to obtain.

[0007]

A blow-out nozzle according to the present invention has a blow-out hole for collecting an air flow generated by a blower and ejecting a high-speed blow-out air flow, and a convex portion is provided on the inner surface of the blow-out hole. Is.

The blow-out nozzle according to the present invention has a blow-out hole for collecting the air flow generated by the blowing means and ejecting a high-speed blow-out air flow, and a groove is provided on the inner surface of the blow-out hole.

The blow-out nozzle according to the present invention has a blow-out hole for collecting the air flow generated by the blowing means and ejecting a high-speed blow-off air flow, and a nonwoven fabric is provided on the inner surface of the blow-out hole.

The hand dryer according to the present invention has a blowout hole for collecting the airflow generated by the blowing means to blow out a high-speed blowout airflow, and is provided with a blowout nozzle having a convex portion on the inner surface of the blowout hole. Is.

The hand dryer according to the present invention has a blow-out hole for collecting the air flow generated by the blowing means to blow out a high-speed blow-off air flow, and has a blow-out nozzle having a groove on the inner surface of the blow-out hole. is there.

The hand dryer according to the present invention has a blowout hole for collecting the airflow generated by the blowing means to blow out a high-speed blowout airflow, and has a blowout nozzle provided with a nonwoven fabric on the inner surface of the blowout hole. Is.

[0013]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below with reference to the drawings. Embodiment 1. 1 is a view for explaining a blowing nozzle according to a first embodiment for carrying out the present invention, and FIG. 2 is a sectional view of a nozzle hole portion of the blowing nozzle shown in FIG. The blowing nozzle of the illustrated example can be applied to various hand dryers as described in the related art. In FIGS. 1 and 2, 3 is a blowing nozzle, 5 is a nozzle hole of the blowing nozzle 3, 6 is a protrusion provided on the inner surface near the outlet of the nozzle hole 5 except the upstream side (near the inlet), and 7 is the nozzle hole 5. It is a contraction section provided on the upstream side. The contraction portion 7 is not provided with the projection 6. The protrusions 6 are provided in the nozzle hole 5 in the direction of air flow and at a predetermined interval in the circumferential direction.

FIG. 3 is a diagram for explaining the flow of air flow in the conventional nozzle hole, and FIG. 4 is a diagram for explaining the flow of air flow in the nozzle hole of the first embodiment. 3 and 4, 8 is a streamline of the airflow, 9 is a point where the streamline 8 of the airflow is redeposited inside the nozzle hole 5, and 10 is a flow disturbed by the projection 6. In the conventional blow-out nozzle, the flow is sharply reduced at the contraction portion 7 on the inner surface of the nozzle hole 5 which is formed of a smooth surface without the projection 6, and flows along the inner surface of the contraction portion 7, When it exceeds the value, it is once peeled from the wall surface and reattached at the reattachment point 9.

The reattachment point 9 vibrates in the flow direction, a large pressure fluctuation occurs at this position, and a turbulence having a strong correlation in the circumferential direction is generated. This turbulence interferes with the edge of the outlet of the nozzle hole 5 and causes a large noise in a wide band. In order to prevent this, in this embodiment, the protrusions 6 are provided on the inner surface of the nozzle hole 5 near the outlet, and as shown in FIG. The turbulence at is eliminated in the circumferential direction.

As a result, wideband noise can be greatly reduced. Further, noise can be reduced without increasing the area of the nozzle hole 5 and without increasing the blower air volume. It is presumed that the noise is reduced because the airflow flowing near the wall surface of the inner surface of the nozzle hole 5 collides with the projections 6 and the flow is scattered, so that a reattachment point that causes large noise is less likely to occur. To be done.

FIG. 5 is a diagram for explaining the effect of the blowing nozzle in the first embodiment. Blowing nozzle 3
When is applied to a hand dryer, the diameter of the nozzle hole 5 is generally about 2 to 4 mm and the wind speed is fast at about 100 m / s. The flow is contracted, and noise is easily generated, which is not preferable. Further, if the height of the protrusions 6 is smaller than 0.3 mm, the height of the protrusions 6 is small and the effect of causing turbulence is reduced, and noise is likely to occur, which is not preferable. From the above, in consideration of reducing noise, the height of the protrusion 6 is preferably in the range of 0.3 mm to 0.5 mm.

FIG. 6 is a diagram for explaining the method of manufacturing the blowing nozzle in the first embodiment. The protrusion 6 can be provided by, for example, attaching a circular hole provided on a flat plate and a protrusion provided on another plate, as shown in FIG. In FIG. 6, reference numeral 11 denotes one plate forming the nozzle hole 5 with a round hole, and 12
Indicates the plate forming the nozzle hole 5 with the round hole and the projection 6, and 13 indicates the contracted portion 7 of the nozzle hole.

Further, another method of manufacturing the blowing nozzle 3 can be realized by attaching the nozzle hole portion 14 formed of an elastic body to the housing 15, as shown in FIG. According to this method, the blowing nozzle 3 can be created more easily than when an elastic body is not used. Further, as another method, as shown in FIG. 8, a component 17 that constitutes the nozzle hole portion 16 and is divided in the radial direction,
It can also be realized by inserting the blowing nozzle 3 into the housing 15.

In FIG. 2, the projections 6 are provided at predetermined intervals in the circumferential direction of the nozzle hole 5, and the projections 6 are provided.
Although a groove is provided between the two, as shown in FIG.
In the circumferential direction of the nozzle hole 5, that is, in the direction orthogonal to the flow direction of the airflow, the projections 6 may be continuously provided, and a groove may be provided between the projections 6. According to this, the noise reduction effect similar to the case of FIG. 2 can be obtained. In addition, when the groove is provided, water is discharged well when the nozzle hole 5 is cleaned, and the noise is not deteriorated by providing the groove. Further, as shown in FIG. 10, the same noise reduction effect can be obtained by forming the protrusion 6 in the nozzle hole 5 in a spiral shape.

Embodiment 2. 11 and 12 are views for explaining a blowing nozzle according to a second embodiment for carrying out the present invention. FIG. 11 shows a perspective view of the blowing nozzle seen from above, and FIG. 12 shows a cross-sectional portion of the blowing nozzle and a half surface of the nozzle. In the first embodiment, the nozzle hole 5 is described as having a round hole shape, but in this embodiment, the nozzle hole 5 is described as having a slit shape. The hand dryer can be applied not only to the blowing nozzle 3 having the round hole-shaped nozzle hole 5 but also to the blowing nozzle 3 having the slit-shaped nozzle hole 5.

FIG. 13 is a diagram for explaining the flow of the air flow in the conventional blowing nozzle. In the case of the conventional blowing nozzle 3 having this slit-shaped nozzle hole 5, FIG.
As shown in FIG. 3, it has a horizontally long outlet with a constant width, and a contracting section 7 is provided on the upstream side of the outlet.
This surface is generally a smooth surface to reduce turbulence. In the conventional blow-out nozzle 3, the flow sharply contracts at the contracting portion 7 on the inner surface of the nozzle hole 5 formed of a smooth surface, flows along the inner surface of the contracting portion 7, and exceeds the contracting portion 7. Once detached from the wall surface, they are reattached at the reattachment point 9.

The reattachment point 9 vibrates in the flow direction, a large pressure fluctuation occurs at this position, and a turbulence having a strong correlation is generated in the direction perpendicular to the flow. This disturbance is
The interference with the edge of the outlet of the nozzle hole 5 causes a large noise in a wide band. In order to prevent this, in this embodiment, the projection 6 is provided on the inner surface of the nozzle hole 5 in the vicinity of the outlet, and as shown in FIG. The turbulent flow at is eliminated in the direction perpendicular to the flow.

This makes it possible to greatly reduce broadband noise. Further, noise can be reduced without increasing the area of the nozzle hole 5 and without increasing the blower air volume. The noise is reduced because the airflow flowing near the wall surface of the inner surface of the nozzle hole 5 collides with the protrusions 6 and the flow is scattered, so that a reattachment point that causes a large noise is less likely to occur. Presumed.

Even when the slit-shaped blow-out nozzle 3 is applied to the hand dryer, the width of the nozzle hole is generally 2 as in the first embodiment using the round-hole-shaped blow-out nozzle 3.
The wind speed is about 100m / s at ~ 4mm. Therefore, the protrusion 6
If the height is larger than 0.5 mm, on the contrary, the flow is contracted in this portion, and noise is likely to occur, which is not preferable. Further, if the height of the protrusions 6 is smaller than 0.3 mm, the height of the protrusions 6 is small and the effect of causing turbulence is reduced, and noise is likely to occur, which is not preferable. In consideration of reducing noise from the above, the height of the protrusion 6 is 0.3 mm even when the slit-shaped blowing nozzle 3 is used, as in the first embodiment.
A range of up to 0.5 mm is preferred.

In FIG. 12, in the nozzle hole 5,
14 shows an example in which the projections 6 are provided in the direction orthogonal to the direction of the air flow and the grooves are provided between the projections 6.
As shown in, the protrusion 6 may be arranged so as to provide a groove also in the direction of air flow. According to this, the noise reduction effect similar to the case of FIG. 12 can be obtained. Also, FIG.
As shown in FIG. 5, a step-like protrusion 1 is formed at the outlet of the nozzle hole 5.
8 may be provided, or as shown in FIG. 16, the protrusion 18 may be arranged so as to further provide the groove 19 also in the direction of air flow. Also in these cases, similar noise reduction effects can be obtained.

Embodiment 3. FIG. 17 is a diagram for explaining a blowing nozzle according to a third embodiment for carrying out the present invention, and FIG. 18 is a diagram for explaining a flow of an air flow inside a nozzle hole in the blowing nozzle shown in FIG. In the first and second embodiments, the example in which the protrusions 6 and 18 are provided near the outlet of the nozzle hole 5 has been described, but in the present embodiment, the case where the protrusion is provided near the inlet of the nozzle hole 5 will be described. In FIGS. 17 and 18, the same reference numerals as those in FIGS. 1 and 2 are the same or equivalent, and
Is a step-like protrusion provided on the inner surface near the inlet of the nozzle hole 5, and 21 is a protrusion 20 provided near the inlet of the nozzle hole 5.
It is a streamline of the flow of the air flow disturbed by.

As shown in FIG. 18, the blow-out nozzle 3 is provided with a step-like projection 20 near the entrance of the blow-off air flow in the nozzle hole 5 to slightly turbulently make the entrance having a relatively low flow velocity. The reattachment on the inner surface of the nozzle hole 5 and the generation of vortices having a large correlation in the circumferential direction are prevented. As a result, noise generated from the blowing nozzle 3 can be prevented. At this time, the height of the protruding portion 20 which is a step is preferably in the range of 0.3 to 0.5 mm for the same reason as in the first and second embodiments in consideration of reducing noise.

Further, although FIG. 17 shows an example in which the protrusion 20 is formed by a step-like step, as shown in FIG. 19, it is formed by the spiral protrusion 20 instead of the step-like step. However, in this case as well, the same noise reduction effect as in the case of FIG. 17 can be obtained. Further, as shown in FIG. 20, similar noise reduction effect can be obtained by providing circumferentially independent protrusions 6 at predetermined intervals in the vicinity of the inlet of the nozzle hole 5.

Further, in the blowing nozzle 3 shown in FIGS. 17 to 20, the hole shape of the nozzle hole 3 is shown as a round hole shape, but it can be applied to a slit nozzle having a slit-shaped nozzle hole 3. it can. For example, as shown in FIG. 21, in the slit nozzle, even if the protrusion 6 is provided near the entrance of the nozzle hole 3, the same noise reduction effect can be obtained. Further, as shown in FIG. 22, in the slit nozzle, the projection 6 may be provided on the entire inner surface of the nozzle hole 3, and in this case, the similar noise reduction effect can be obtained. Also, in the case of the blowing nozzle 3 having a round hole shape, the projection 6 is similarly formed on the entire inner surface of the nozzle hole 3.
Needless to say, may be provided.

Fourth Embodiment FIG. 23 is a diagram for explaining a blowing nozzle according to a fourth embodiment for carrying out the present invention. In FIG. 23, the components denoted by the same reference numerals as those in FIGS. The grooves are arranged in rows at intervals. In this way, when the groove 22 is provided on the inner surface of the nozzle hole 3 substantially at right angles to the flow direction,
The flow becomes slightly turbulent in the groove 22, and it is possible to eliminate the turbulence having a strong correlation in the direction perpendicular to the flow.

As a result, the vortex which is the main sound source of noise can be eliminated, so that noise can be reduced.
The depth of the groove 22 is 0 in consideration of reducing noise.
It is in the range of 3 to 0.5 mm. The groove 22 is formed, for example, in FIG.
As shown in FIG. 4, the inner surface of the slit-shaped nozzle hole 5 may be provided in a mesh shape. Here, an example in which the direction of the groove 22 is inclined up to about 45 degrees with respect to the flow direction is shown. Also in this case, the noise reduction effect similar to that in the case of FIG. 23 can be obtained.

In FIGS. 23 and 24, the case where the nozzle hole 5 has a slit shape is shown as an example. However, even if the nozzle hole 5 has a round hole shape and is provided with a similar groove 22, a similar noise reduction effect can be obtained. Obtainable. 23 and 24 show an example in which the groove 22 is provided on the entire inner surface of the nozzle hole 5, the inner surface of the nozzle hole 5 may be provided only near the inlet or only near the outlet. Good.

Embodiment 5 FIG. 25 is a view for explaining a blowing nozzle according to Embodiment 5 for carrying out the present invention. In FIG. 25, the same reference numerals as those in FIGS. 1 and 2 are the same or equivalent, and 23 is a non-woven fabric provided on the entire inner surface of the slit-shaped nozzle hole 5. Since the surface of the non-woven fabric 23 has fine protrusions, it is possible to make the flow of the air flow turbulent and eliminate vortices having a correlation in the direction perpendicular to the flow. Furthermore, since the air flow slightly leaks from between the nonwoven fabrics 23 at the air outlet of the nozzle hole 5, it is possible to obtain the air flow reaching a distant place. This makes it possible to obtain the blowing nozzle 3 having high drying performance and low noise even with the same air volume.

It is presumed that the noise is reduced by providing the nonwoven fabric 23 on the inner surface of the nozzle hole 5 for the following reason. Nozzle noise consists of sound from a quadrupole source due to turbulence and from a dipole source due to wall pressure fluctuations. Comparing these, the sound power (acoustic radiation efficiency) of the dipole sound source is higher. The fibers of the non-woven fabric 23 act as a damper to attenuate the energy of pressure fluctuation on the nozzle surface and reduce the power of the dipole sound source. As a result, it is estimated that the quadrupole sound source with low acoustic power becomes dominant and the noise level decreases.

The thickness of the nonwoven fabric 23 is preferably 3 mm or less. If the thickness of the non-woven fabric 23 is thicker than 3 mm, air also flows into the non-woven fabric 23 by that amount, the velocity distribution becomes unstable, and a large amount of air is required. For this reason, the air volume becomes unstable and it is difficult to set the total flow rate, which is not preferable. In addition, in FIG. 25, the case where the nozzle hole 5 has a slit shape is illustrated.
The same noise reduction effect can be obtained by providing 3 in the configuration. Further, although FIG. 25 exemplifies an example in which the nonwoven fabric 23 is provided on the entire inner surface of the nozzle hole 5, it may be provided only near the inlet on the inner surface of the nozzle hole 5,
It may be provided only near the exit.

[0037]

The blow-out nozzle according to the present invention has a blow-out hole for collecting the air flow generated by the blowing means and ejecting a high-speed blow-out air flow, and by providing a convex portion on the inner surface of the blow-out hole, The noise from the nozzle can be reduced without increasing the air volume.

The blow-out nozzle according to the present invention has a blow-out hole for collecting the air flow generated by the blowing means and ejecting a high-speed blow-out air flow, and by forming a groove on the inner surface of this blow-out hole, the air volume is increased. Without letting
Noise from the nozzle can be reduced.

The blowing nozzle according to the present invention has a blowing hole for collecting the air flow generated by the blowing means and ejecting a high-speed blowing air current. The noise from the nozzle can be reduced without increasing it.

The hand dryer according to the present invention has a blow-out hole for collecting the air flow generated by the blowing means to blow out a high-speed blow-out air flow, and is provided with a blow-out nozzle having a convex portion on the inner surface of the blow-out hole. By doing so, noise from the nozzle can be reduced without increasing the air volume.

The hand dryer according to the present invention has a blowout hole for collecting the airflow generated by the blowing means to blow out a high-speed blowoff airflow, and is provided with a blowout nozzle having a groove on the inner surface of the blowout hole. As a result, noise from the nozzle can be reduced without increasing the air volume.

The hand dryer according to the present invention has a blowout hole for collecting the airflow generated by the blower means to blow out a high-speed blowout airflow, and is provided with a blowout nozzle provided with a nonwoven fabric on the inner surface of the blowout hole. By doing so, noise from the nozzle can be reduced without increasing the air volume.

[Brief description of drawings]

FIG. 1 is a diagram for explaining a blowing nozzle according to a first embodiment.

FIG. 2 is a sectional view of a nozzle hole portion of the blowing nozzle shown in FIG.

FIG. 3 is a diagram for explaining a flow of an airflow in a conventional nozzle hole.

FIG. 4 is a diagram for explaining the flow of airflow inside the nozzle hole according to the first embodiment.

FIG. 5 is a diagram for explaining the effect of the blowing nozzle according to the first embodiment.

FIG. 6 is a diagram for explaining the manufacturing method of the blowing nozzle according to the first embodiment.

FIG. 7 is a diagram for explaining the manufacturing method of the blowing nozzle according to the first embodiment.

FIG. 8 is a diagram for explaining the manufacturing method of the blowing nozzle according to the first embodiment.

FIG. 9 is a diagram for explaining a blowing nozzle according to the first embodiment.

FIG. 10 is a diagram for explaining a blowing nozzle according to the first embodiment.

FIG. 11 is a diagram for explaining a blowing nozzle according to the second embodiment.

FIG. 12 is a diagram for explaining a blowing nozzle according to the second embodiment.

FIG. 13 is a diagram for explaining a flow of an airflow in a conventional blowing nozzle.

FIG. 14 is a diagram for explaining a blowing nozzle according to the second embodiment.

FIG. 15 is a diagram for explaining a blowing nozzle according to the second embodiment.

FIG. 16 is a diagram for explaining a blowing nozzle according to the second embodiment.

FIG. 17 is a diagram for explaining a blowing nozzle according to the third embodiment.

FIG. 18 is a view for explaining the flow of airflow inside the nozzle hole in the blowing nozzle shown in FIG.

FIG. 19 is a diagram for explaining a blowing nozzle according to the third embodiment.

FIG. 20 is a diagram for explaining a blowing nozzle according to the third embodiment.

FIG. 21 is a diagram for explaining a blowing nozzle according to the third embodiment.

FIG. 22 is a diagram for explaining a blowing nozzle according to the third embodiment.

FIG. 23 is a diagram for explaining a blowing nozzle according to the fourth embodiment.

FIG. 24 is a diagram for explaining a blowing nozzle according to the fourth embodiment.

FIG. 25 is a diagram for explaining a blowing nozzle according to the fifth embodiment.

FIG. 26 is a diagram for explaining the structure of a conventional hand dryer.

FIG. 27 is a diagram for explaining a conventional blowing nozzle.

FIG. 28 is a diagram for explaining a conventional nozzle hole.

[Explanation of symbols]

3 blowing nozzles, 5 nozzle holes, 6, 18, 20,
21 protrusions, 19, 22 grooves, 23 non-woven fabric.

   ─────────────────────────────────────────────────── ─── Continued front page    (72) Inventor Jiro Kitayama             2-3 2-3 Marunouchi, Chiyoda-ku, Tokyo             Inside Ryo Electric Co., Ltd. (72) Inventor Keiji Kameishi             2-3 2-3 Marunouchi, Chiyoda-ku, Tokyo             Inside Ryo Electric Co., Ltd. (72) Inventor Yasuyuki Itoigawa             2-6-2 Otemachi 2-chome, Chiyoda-ku, Tokyo             Ryoden Engineering Co., Ltd. F-term (reference) 4F033 AA04 BA02 CA04 DA01 EA01                       LA00 NA01

Claims (6)

[Claims] 1. A blow-out nozzle having a blow-out hole for collecting an air flow generated by a blower and ejecting a high-speed blow-out air flow, and having a convex portion on the inner surface of the blow-out hole. 2. A blow-out nozzle having a blow-out hole for collecting an air flow generated by a blower and ejecting a high-speed blow-out air flow, and having a groove on the inner surface of the blow-out hole. 3. A blow-out nozzle comprising a blow-out hole for collecting an air flow generated by a blower and ejecting a high-speed blow-out air flow, and a nonwoven fabric is provided on an inner surface of the blow-out hole. 4. A hand-drying device, comprising: a blow-out nozzle for collecting an air flow generated by a blower means to blow out a high-speed blow-out air flow; and a blow-out nozzle having a convex portion on the inner surface of the blow-out hole. apparatus. 5. A hand drying apparatus having a blow-out nozzle for collecting an air flow generated by the blower means to blow out a high-speed blow-out air flow, and having a blow-out nozzle having a groove on the inner surface of the blow-out hole. . 6. A hand-drying device comprising a blow-out nozzle for collecting an air flow generated by a blower to blow a high-speed blow-out air flow, and a blow-out nozzle provided with a nonwoven fabric on the inner surface of the blow-out hole. apparatus.