KR101671370B1

KR101671370B1 - Air heater

Info

Publication number: KR101671370B1
Application number: KR1020150055510A
Authority: KR
Inventors: 김종현
Original assignee: 김종현
Priority date: 2015-04-20
Filing date: 2015-04-20
Publication date: 2016-11-01
Also published as: KR20160124608A

Abstract

The present invention relates to an air heater in which interference with the flow of air is prevented as much as possible and the efficiency of air heating is improved.
An air heater according to an embodiment of the present invention includes: a support functioning as a pedestal; An air supply unit built in the support unit and generating air; A head unit that receives the air generated by the air supply unit and discharges the air to the front end; A connecting passage for communicating the air supply unit and the head unit so that air is delivered to the head unit; And a heating unit provided in the head unit to heat the air passing through the head unit.
And can be stocked by being supported by the support.

Description

Air heater {AIR HEATER}

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an air heater, and more particularly, to an air heater having improved air heating efficiency while reducing noise due to friction of air.

Generally, an air heater such as a hair dryer receives outside air through one end of a cylindrical tube having open ends, heats the received air, and emits heated air through the other end.

The air heater includes a fan for generating air, a driving unit for driving the fan, a heating unit for heating air to be blown, and a housing formed in various shapes according to the design.

However, in the conventional air heater, the parts such as the fan, the driving part, the heating part, the electric wire and the like, and the elements for mounting these parts to the housing are exposed on the air passage to the inside of the air tube It causes interference and generates a lot of noise. In addition, the flow of air is intermittently generated due to the structure of the fan pushing the air in one direction while rotating the plurality of blades, and the difference in pressure distribution due to such intermittent flow causes turbulence and noise due to collision of air with the component Amplified. Further, the conventional air heater applied to the hair dryer may cause high temperature radiant heat to be directly applied to the hair or the scalp due to the location of the hot heating part adjacent to the air outlet, thereby causing hair damage or skin drying.

On the other hand, there have been various attempts to solve such a problem, but the fundamental solution of the problem has been limited.

SUMMARY OF THE INVENTION Accordingly, the present invention has been made in view of the above problems, and it is an object of the present invention to provide an air heater in which interference with the flow of air is minimized.

Another object of the present invention is to provide an air heater in which a heating value is secured in a section of a short cylindrical tube and the efficiency of air heating is improved.

According to an aspect of the present invention, there is provided an air heater comprising: a support member functioning as a pedestal; An air supply unit built in the support unit and generating air; A head unit that receives the air generated by the air supply unit and discharges the air to the front end; A connecting passage for communicating the air supply unit and the head unit so that air is delivered to the head unit; And a heating unit provided in the head unit to heat the air passing through the head unit.

And can be stocked by being supported by the support.

Wherein the head portion comprises: an outer wall formed in a hollow cylindrical shape; And an inner wall formed in a hollow cylindrical shape having a radius smaller than that of the outer wall.

Wherein an inner space surrounded by the outer wall and the inner wall is formed between the outer wall and the inner wall, the connection passage is communicated with the inner space, and a spraying passage is provided on the rear end side of the inner wall so as to inject air in the inner space toward the front end .

The air heater may further include a separating wall formed in a hollow cylindrical shape having a smaller radius than the inner wall and disposed concentrically with the inner wall.

Wherein the separation wall separates the hollow of the inner wall into an outer pipe outside the separation wall radius and a hollow central pipe of the separation wall, the heating part including a first heating part arranged to surround an outer circumferential surface of the separation wall, And a second heating part arranged to surround the inner circumferential surface of the inner wall.

The first heating part and the second heating part may be heating plates for radiating heat.

One of the first heating portion and the second heating portion may be a heating plate for emitting heat and the other may be a reflecting plate for reflecting heat emitted from the heating plate.

A plurality of grooves may be formed on the surfaces of the first heating portion and the second heating portion.

The air injected through the injection path flows out to the front end of the head through the outer conduit and a part of the air flowing out to the front end of the head flows into the central conduit and flows out to the rear end of the head, The air that has flowed out to the rear end may flow into the outer channel together with the outside air at the rear end of the head portion, and may be recirculated.

As described above, according to the embodiment of the present invention, noise due to air friction can be reduced as interference with air flow is prevented.

In addition, efficient air heating is possible by circulating air through the central duct and the outer duct.

Furthermore, volume and weight can be reduced by implementing heating of the air in a simple configuration.

Furthermore, since the gravity center is provided on the lower support portion side, it is possible to implement the stocking housing and the convenience of the user can be increased.

1 is a perspective view of an air heater according to an embodiment of the present invention.
2 is a cross-sectional view of an air heater according to an embodiment of the present invention.
3 is a cross-sectional view of a head portion of an air heater according to an embodiment of the present invention.
4 is a cross-sectional view of a head portion of an air heater according to another embodiment of the present invention.
5 is a side cross-sectional view of a head portion showing an air flow of an air heater according to an embodiment of the present invention.
6 is a cross-sectional view of a head portion showing an air layer formed by the air flow of an air heater according to an embodiment of the present invention.
7 is a view showing a surface shape of a heating plate and a reflection plate according to an embodiment of the present invention.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings.

FIG. 1 is a perspective view of an air heater according to an embodiment of the present invention, and FIG. 2 is a sectional view of an air heater according to an embodiment of the present invention.

1 and 2, an air heater 1 according to an embodiment of the present invention includes a housing 10 composed of a support portion 12, a head portion 14, and a connection passage 15 do.

The support portion (12) functions as a base of the air heater (1). The support portion 12 is provided with an air supply portion 40. The air supply unit 40 may include a motor and a fan, and the motor and the fan that function to generate and blow air are obvious to those skilled in the art A description thereof will be omitted.

The head portion 14 is formed into a hollow cylindrical shape. Further, the head portion 14 includes an outer wall 16, an inner wall 18, and an inner space 19 formed outside the radius of the hollow.

The outer wall 16 is an outer plate of the head portion 14 formed in a cylindrical shape and the inner wall 18 is formed in a cylindrical shape having a smaller radius than the outer wall 16, It is a wrapping plate.

The inner space 19 is a space surrounded by the outer wall 16 and the inner wall 18.

The connection passage 15 allows the air supply portion 40 built in the support portion 12 to communicate with the internal space 19 of the head portion 14. 1 and 2, the connecting passage 15 extends vertically, but is not limited thereto.

2, the air heater 1 according to the embodiment of the present invention includes a separating wall 20, an outer pipe 22, a central pipe 24, a first heating portion 30, And heating portions 32 and 34. [

The separating wall 20 is formed in a hollow cylindrical shape having a smaller radius than the inner wall 18 of the head portion 14 and is disposed in the hollow of the head portion 14. Further, the separating wall 20 may be disposed concentrically with the head portion 14. Thus, the separating wall 20 separates the hollow of the head portion 14 into two passages. The outer pipe 22 is a passage formed between the separation wall 20 and the inner wall 18 and the central pipe 24 is a hollow passage of the separation wall 20.

The first heating portion 30 is provided on the outer peripheral surface of the separating wall 20. In addition, the first heating unit 30 heats the air passing through the outer conduit 22. Here, the first heating unit 30 is a heating plate 30 such as a heating film disposed to surround the outer circumferential surface of the separation wall 20 to radiate heat. On the other hand, if a heat generating film is used, the generation of harmful electromagnetic waves can be minimized.

The second heating portions 32 and 34 are provided on the inner peripheral surface of the inner wall 18 of the head portion 14. The second heating units 32 and 34 heat the air passing through the outer pipe 22.

3 is a cross-sectional view of a head portion of an air heater according to an embodiment of the present invention.

According to one embodiment of the present invention, the second heating portion 32 is a heating plate 32 such as a heat generating film disposed to surround the inner peripheral surface of the inner wall 18 of the head portion 14 to radiate heat. In this way, when the first heating portion 30 and the second heating portion 32 are both the heating plates 30 and 32, the heating efficiency of the air passing through the outer conduit 22 is increased.

4 is a cross-sectional view of a head portion of an air heater according to another embodiment of the present invention.

According to another embodiment of the present invention, the second heating portion 34 is a reflection plate 34 arranged to surround the inner circumferential surface of the inner wall 18 of the head portion 14. In addition, the reflection plate 34 may be formed by reflection coating the inner circumferential surface of the inner wall 18. Further, the reflection plate 34 reflects heat emitted from the heating plate 30. [ The first heating unit 30 is the heating plate 30 and the second heating unit 34 is the reflection plate 34. The heating efficiency of the air passing through the outer conduit 22 is higher than a set value The production cost can be reduced as compared with the embodiment of the present invention described with reference to FIG.

Here, the second heating unit 34 is a reflector, but the present invention is not limited thereto. That is, one of the first heating portion 30 and the second heating portion 34 may be a heating plate and the other may be a reflector.

Hereinafter, the flow of air and formation of the air layer in the air heater 1 according to the embodiment of the present invention will be described with reference to Figs. 5 and 6. Fig.

5 is a side cross-sectional view of a head portion showing an air flow of an air heater according to an embodiment of the present invention. In Fig. 5, the flow of air is shown by an arrow.

As shown in FIG. 5, the air heater 1 according to the embodiment of the present invention further includes an air injection path 17.

The air injection path 17 is formed by the air supply unit 40 and is driven by the air supply unit 40 to supply the air blown into the internal space 19 via the connection passage 15 to the outside pipe (22). That is, the air injection path 17 communicates the inner space 19 and the outer pipe 22. The air injection path 17 is formed so that the air in the internal space 19 is injected in one direction along the axial direction of the head part 14. One direction in which the air in the inner space 19 is injected to the outer pipe 22 is defined as a direction from the rear end to the front end of the head part 14 and is referred to as forward direction and the opposite direction is referred to as reverse direction . Further, the air injection path 17 may be formed on the rear end side of the inner wall 18 of the head portion 14. [

The air injected from the rear end side of the head portion 14 to the outer side pipeline 22 through the air injection path 17 moves forward and flows out to the front end of the head portion 14. [ At this time, the air heated by the first and second heating sections (30, 32, 34) flows out to the front end of the head section (14) while passing through the outer channel (22). Also, a part of the air flowing out to the front end of the head part 14 flows into the central pipeline 24 by the coanda effect. Such a Coanda effect has a tendency that an air current jetted toward the wall surface is sucked and flowed on the surface, and will be apparent to those skilled in the art, so a detailed description thereof will be omitted.

The air flowing into the central duct (24) moves in the reverse direction and flows out to the rear end of the head part (14). The air flowing into the rear end of the head portion 14 through the central pipeline 24 flows into the outer piping 22 by the Coanda effect. At this time, the air moving in the reverse direction through the central duct (24) blocks the cold outside air at the rear end of the head part (14) from flowing into the central pipe (24) The outside air flows out to the rear end of the head portion 14 and flows into the outer conduit 22 together with the air flowing into the outer conduit 22 by the Coanda effect. Accordingly, a small amount of air flowing into the outer channel 22 can be effectively heated. Further, when the air passes through the narrow jet path 17, the air pressure inside the head part 14 becomes lower than the external air pressure by the venturi effect, so that the outside air is sucked into the outer channel 22 do. Such a venturi effect is based on the Bernoulli principle in which the flow velocity and the atmospheric pressure vary as the fluid changes in the diameter of the channel, and a detailed description thereof will be omitted.

6 is a cross-sectional view of a head portion showing an air layer formed by the air flow of an air heater according to an embodiment of the present invention. In Fig. 6, three air layers partitioned by the one-dot chain line in the outer channel 22 are shown. These three air layers are formed by visualizing the air layer formed in the outer channel 22 for convenience of explanation.

As shown in FIG. 6, an air layer is formed in the outer channel 22 due to the property of expansion when the air is heated. Due to the nature of the air, an air layer having a relatively high temperature and a relatively low density is formed on the outside of the outer channel 22 in the radial direction, and an air layer having a relatively low temperature and a relatively high temperature is formed on the radially inner side. That is, the air passing through the outer channel 22 flows while forming a centrifugal laminar flow.

This centrifugal laminar flow increases the Coanda effect. In other words, since the low-temperature high-density air formed radially inward of the outer channel 22 flows toward the front end of the head portion 14 due to the property of moving toward the centrifugal channel, the air flowing into the central channel 24 . In addition, the low-temperature high-density air is recirculated to the outer pipe (22) via the central pipe (24), thereby increasing the heating efficiency of the air. On the other hand, when the inner wall 18 of the head portion 14 and the separating wall 20 are spaced apart from each other by a threshold value in accordance with the setting of a person skilled in the art to form the outer pipe 22, The effect can be maximized.

By recirculating and heating such low-temperature air, the capacity of the air supply part 40, which functions to generate and blow air, can be reduced, and the volume of the connection path for blowing can be reduced. Accordingly, as the overall volume and weight of the air heater 1 are reduced, the portability of the air heater 1 can be increased.

7 is a view showing a surface shape of a heating plate and a reflection plate according to an embodiment of the present invention.

As shown in FIG. 7, a plurality of dimple grooves 36, such as a dimple shape, are formed on the surfaces of the heating plates 30 and 32 and the reflection plate 34. By forming the dimple groove 36, the friction between the air and the heating plates 30 and 32 and the reflection plate 34 can be reduced, and noise due to the flow of air can be reduced. In addition, the heat exchange between the air and the heating plates 30 and 32 and the reflection plate 34 can be maximized by the minute turbulence generated by the dimple groove 36.

As described above, according to the embodiment of the present invention, noise due to air friction can be reduced as interference with air flow is prevented. Also, efficient heating of the air is possible by circulating air through the central duct 24 and the outer duct 22. Furthermore, volume and weight can be reduced by implementing heating of the air in a simple configuration. Furthermore, since the graft housing 10 can be realized as having the center of gravity on the side of the lower supporting portion 12, the convenience of the user can be increased. Meanwhile, when such an air heater is applied to a hair dryer or the like, the radiant heat of the heat generating part is not directly applied to the hair, thereby preventing damage to the hair and improving the safety of the human body.

While the present invention has been described in connection with what is presently considered to be practical exemplary embodiments, it is to be understood that the invention is not limited to the disclosed embodiments, but, on the contrary, And all changes to the scope that are deemed to be valid.

1: air heater
10: housing 12:
14: head part 15: connection passage
16: outer wall 17:
18: inner wall 19: inner space
20: separating wall 22: outer pipe
24: Central conduit
30: first heating section 32, 34: second heating section
36: dimple home
40:

Claims

A support functioning as a pedestal;
An air supply unit built in the support unit and generating air;
A head unit that receives the air generated by the air supply unit and discharges the air to the front end;
A connecting passage for communicating the air supply unit and the head unit so that air is delivered to the head unit; And
A heating unit provided in the head unit to heat air passing through the head unit;
, &Lt; / RTI &
Wherein the support portion is supported by the support portion,
Wherein:
An outer wall formed into a hollow cylindrical shape; And
An inner wall formed in a hollow cylindrical shape having a smaller radius than the outer wall;
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An inner space surrounded by the outer wall and the inner wall is formed between the outer wall and the inner wall,
The connection passage communicates with the internal space,
An injection path is formed on the rear end side of the inner wall so as to inject air in the inner space toward the front end,
Further comprising a separating wall formed in a hollow cylindrical shape having a radius smaller than that of the inner wall and disposed concentrically with the inner wall,
The separation wall separating the hollow of the inner wall into an outer conduit outside the separation wall radius and a hollow central conduit of the separation wall,
Wherein the heating unit includes a first heating unit arranged to surround the outer circumferential surface of the separation wall, and a second heating unit arranged to surround the inner circumferential surface of the inner wall.

delete

The method according to claim 1,
Wherein the first heating portion and the second heating portion are heating plates for radiating heat.

The method according to claim 1,
Wherein one of the first heating portion and the second heating portion is a heating plate for emitting heat and the other is a reflecting plate for reflecting heat emitted from the heating plate.

The method according to claim 1,
Wherein a plurality of grooves are formed on the surfaces of the first heating portion and the second heating portion.

The method according to claim 1,
The air injected through the injection path flows out to the front end of the head portion through the outer conduit,
A part of the air flowing out to the front end of the head part flows into the center pipe and flows out to the rear end of the head part,
Wherein the air flowing into the rear end of the head portion flows into the outer conduit together with the outside air at the rear end of the head portion and is recirculated.