JPH10257917A - Hair dryer - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduce noise emission by suppressing generation of noises in the peripheral zone of a fan. SOLUTION: A bell mouth 19 is installed between a suction hole 13 and a fan 15, wherein the front extremity of the bell mouth 19 is positioned some inside from the periphery of the fan 15. A lateral suction hole 20 is furnished in the side face of a housing 11, and the external air is passed around the outer periphery of the bell mouth 19 and introduced to the peripheral zone of the fan 15. The circumferential length of the opening of the lateral suction hole is made one third to one tenth of the whole circumference. Generation of vortices is suppressed by restricting the air quantity to be led to the fan peripheral zone properly, which results in a reduction of noise emission.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a hair dryer, and more particularly to a hair dryer characterized by means for reducing noise.

[0002]

Conventionally, a substantially cylindrical housing having a rear end serving as an intake port and a front end serving as a discharge port, a fan provided in a rear portion of the housing, and a fan provided in front of the fan. A hair dryer having a motor for driving a fan and a heater provided in front of the motor is widely used.

[0003] In this configuration, a considerable part of the noise is generated from the vortex formed on the fan, especially on the peripheral end of the fan,
It is mainly released to the outside through the inlet.

Conventionally, as a countermeasure against the noise at the peripheral edge of the fan, it is known to arrange a sound absorbing material at the peripheral edge of the fan. However, a satisfactory effect has not yet been obtained.

Therefore, the present invention has been made to reduce the noise by suppressing the generation of the noise at the peripheral end of the fan, instead of absorbing the noise.

[0006]

That is, according to the present invention, there is provided a cylindrical member having a rearwardly extending portion between a suction port and a fan,
A front end is located slightly inside the peripheral end of the fan, and a bell mouth is provided to guide outside air from the suction port to a portion on the inner periphery from the peripheral end of the fan.
A lateral suction port is provided that passes through the outer periphery of the bell mouth and leads to a peripheral end portion of the fan. Further, the circumferential length of the opening of the horizontal suction port is set to 1/3 to 1/10 of the entire circumference. A hair dryer characterized in that a small amount of air is guided to a peripheral end portion of the fan.

[0007] Further, the present invention provides a method in which a suction port is provided between a fan and a fan.
The rear end is formed of a cylindrical body, the front end of which is located slightly inside the peripheral end of the fan, and a bell mouth that guides the outside air from the suction port to the inner peripheral part from the peripheral end of the fan is provided. Opening, providing a horizontal suction port that guides outside air to the peripheral end portion of the fan through the outer periphery of the bell mouth, and further, providing a resistor made of non-woven fabric or the like in a flow path from the horizontal suction port, A hair dryer characterized in that a small amount of air is guided to a peripheral end portion.

[0008] The lateral suction port may have various configurations such as a single hole, a mesh, a punched metal, and a group of many small holes. For example, it is possible to adopt a configuration in which one or several hole aggregation portions in which a large number of holes are connected are provided on the entire circumference.

In the present invention, a smaller amount of air is introduced into the peripheral portion of the fan than in other portions. As a result, the bell mouth does not have the horizontal suction port, and the fan has the same amount of air as the other portion at the peripheral end of the fan. As compared with a state in which no air is introduced into the end portion, generation of a vortex is suppressed, and noise is reduced.

[0010] The amount of air introduced into the peripheral portion of the fan is
Specifically, it is appropriate to determine the value by an experiment. However, the circumferential length of the opening of the lateral suction port is generally set to one third of the entire circumference.
The optimum state is between 1 and 10 times, and in many cases about 1/3 to 1/6 is appropriate. If the opening is too large, the amount of air to be introduced becomes too large, so that not only the generation of eddies is increased, but also the opening promotes the diffusion of noise to the outside, and the noise is rather increased. If the amount is too small, the amount of air to be introduced is too small, and the generation of vortices also increases. When the resistor is used, the opening is naturally larger than when the resistor is not used.

In the present invention, it is essential to appropriately limit the amount of air introduced into the peripheral end portion of the fan. The means for limiting the size of the opening, the means for providing a resistor, or a combination thereof are used. Means are used. Note that the resistor is useful because it also functions as a sound absorbing material.

[0012]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a block diagram showing an embodiment of the present invention.

The hair dryer 10 has a grip 12 provided on a substantially cylindrical housing 11. This housing 1
1, the rear end (the left end in FIG. 1) becomes the suction port 13,
Covered with punching metal, front end (right end in Fig. 1)
Is the discharge port 14 and is covered by the grid. A fan 15 is provided at the rear of the housing 11, and a motor 16 for driving the fan 15 is provided in front of the fan 15.
And a heater 1 in front of the
8 are provided.

The bell mouth 19 is connected to the suction port 13 and the fan 1.
5 is provided. The bell mouth 19 is formed of a tubular body having a rearwardly widened rear end, the front end of which is located slightly inside the peripheral end of the fan 15, the rear end of which is joined to the inner peripheral surface of the suction port 13, and the outside air flows through the suction port 13. As a result, the fan 15 is guided to an inner peripheral portion from the peripheral end.

A lateral suction port 20 opens to the side of the housing 11 and guides outside air to the peripheral end of the fan 15 through the outer periphery of the bell mouth 19. The horizontal suction port 20 is provided with two hole collecting portions 22, 22 in which a large number of holes 21,. The circumferential length of the opening of the horizontal suction port 20, that is, the holes 21,.
Is about one-fourth of the entire circumference.

Since the hair dryer 10 has the above configuration, a small amount of outside air is supplied to the peripheral end portion of the fan 15 through the lateral suction port 20 to suppress the generation of vortices and to reduce noise. You. According to the experiment, the noise was
6 to 10 decibels were obtained as compared with the case where was completely closed.

FIG. 5 shows another embodiment. In the hair dryer 10 ', a resistor 23' made of a nonwoven fabric made of glass fiber is provided inside the horizontal suction port 20 '.
Other configurations are almost the same as those of the hair dryer 10, and the description is omitted.

In this hair dryer 10 ′, in addition to the restriction by the size of the opening of the hair dryer 10,
The outside air to the peripheral end portion of the fan 15 is also restricted by the resistor 23 ′. Therefore, in this configuration, the size of the opening and the nature and size of the resistor are selected so that the supplied outside air is in an appropriate amount due to both restrictions.

[0019]

According to the hair dryer of the present invention, the bell mouth and the lateral suction port guide the outside air to the peripheral end portion of the fan, and the amount thereof is limited by the size of the horizontal suction port and the resistor. Since the amount is smaller than that of the portion, the vortex generated in this portion can be effectively suppressed, and the noise can be reduced.

[Brief description of the drawings]

FIG. 1 is a side view of one embodiment of the present invention.

FIG. 2 is a side sectional view of the same example.

FIG. 3 is a cross-sectional view similar to the previous figure, taken along an opening of a lateral suction port of the same example.

FIG. 4 is an end view of the same example taken along line AA of FIG. 2;

FIG. 5 is a sectional view similar to FIG. 3 of another embodiment.

[Explanation of symbols]

10 hair dryer, 11 housing, 12 grip, 13 suction port, 14 discharge port, 15 fan, 1
6 ... motor, 17 ... support member, 18 ... heater, 19 ... bell mouth, 20 ... lateral suction port, 21 ... hole, 22 ... hole collecting part. 10 ': hair dryer, 11': housing, 1
3 '... inlet, 15' ... fan, 19 '... bell mouth,
20 ': lateral suction port, 21': hole, 23 ': resistor.

Claims (3)

[Claims] 1. A substantially cylindrical housing having a rear end serving as an intake port and a front end serving as a discharge port, a fan provided in a rear portion of the housing, a motor provided in front of the fan and driving the fan. In a hair dryer having a heater provided in front of the motor, between the suction port and the fan, a rear end is formed of a tubular body, and a front end is located slightly inside a peripheral end of the fan,
A bell mouth that guides outside air from the suction port to an inner portion from the peripheral end of the fan is provided, and is opened on a side surface of the housing, and a lateral suction that guides outside air to the peripheral end portion of the fan through the outer periphery of the bell mouth. And a small amount of air is guided to the peripheral end of the fan by setting the circumferential length of the opening of the lateral suction port to one third to one tenth of the entire circumference. Hair dryer. 2. A substantially cylindrical housing having a rear end serving as an intake port and a front end serving as a discharge port, a fan provided in a rear portion of the housing, a motor provided in front of the fan and driving the fan. In a hair dryer having a heater provided in front of the motor, between the suction port and the fan, a rear end is formed of a tubular body, and a front end is located slightly inside a peripheral end of the fan,
A bell mouth that guides outside air from the suction port to an inner portion from the peripheral end of the fan is provided, and is opened on a side surface of the housing, and a lateral suction that guides outside air to the peripheral end portion of the fan through the outer periphery of the bell mouth. A hair dryer having a mouth, a resistor made of a nonwoven fabric or the like provided in a flow path from the horizontal suction port, and introducing a small amount of air to a peripheral end portion of the fan. 3. The horizontal suction port according to claim 1, wherein the horizontal suction port has a hole collecting portion having a large number of holes connected to one another around the entire circumference.
A hair dryer characterized by being provided at a few places.